KR102719655B1 - Optical lens, light uint and lighting apparatus having thereof - Google Patents

Abstract

An optical lens disclosed in an embodiment comprises: a recess concave from a bottom surface in a lower portion of a transparent body; a plurality of incident surfaces having a first incident surface on an upper surface of the recess, and second and third incident surfaces corresponding to each other on opposite sides of the recess; a first total reflection surface and a second total reflection surface arranged on opposite sides of the body; and a first exit surface in an upper center of the body, and a second exit surface and a third exit surface on both sides of the first exit surface, wherein the first exit surface has a convex curved surface, the second exit surface has a convex curved surface, and the third exit surface includes a concave curved surface.

Description

OPTICAL LENS, LIGHT UINT AND LIGHTING APPARATUS HAVING THEREOF

The present invention relates to an optical lens.

The present invention relates to a light unit and a lighting device having an optical lens.

Semiconductor devices containing compounds such as GaN and AlGaN have many advantages such as wide and easily tunable band gap energy, and can be used in various ways such as light-emitting devices, light-receiving devices, and various diodes.

In particular, light-emitting devices such as light-emitting diodes (LEDs) or laser diodes using semiconductor materials of groups 3-5 or 2-6 can implement various colors such as red, green, blue, and ultraviolet through the development of thin film growth technology and device materials, and can also implement efficient white light by using fluorescent substances or combining colors, and have the advantages of low power consumption, semi-permanent lifespan, fast response speed, safety, and environmental friendliness compared to existing light sources such as fluorescent lamps and incandescent lamps.

In addition, when photodetectors or solar cells are made using semiconductor materials of groups 3-5 or 2-6, light-receiving devices can be developed to absorb light of various wavelengths and generate photocurrents, thereby utilizing light of various wavelengths from gamma rays to radio wavelengths. In addition, they have the advantages of fast response speed, safety, environmental friendliness, and easy control of device materials, so they can be easily used in power control or ultra-high frequency circuits or communication modules.

Accordingly, semiconductor devices are being used in a wide range of applications, including transmission modules for optical communication means, light-emitting diode backlights that replace cold cathode fluorescence lamps (CCFLs) that constitute the backlights of LCD (Liquid Crystal Display) displays, white light-emitting diode lighting devices that can replace fluorescent or incandescent bulbs, automobile headlights and signal lights, and sensors that detect gas or fire. In addition, semiconductor devices can be used in a wide range of applications, including high-frequency application circuits, other power control devices, and communication modules.

The embodiment provides a novel optical lens.

An embodiment provides an optical lens having a long bar shape.

An embodiment provides an optical lens having at least three different entrance faces and at least three different exit faces.

The embodiment provides an optical lens in which at least one of a first incident surface and a first exit surface has an asymmetrical shape with respect to a central axis perpendicular to the bottom center of the recess.

The embodiment provides an optical lens in which a first incident surface and a first exit surface have an asymmetrical shape with respect to a central axis perpendicular to the bottom center of the recess.

The embodiment provides an optical lens in which second and third incident planes arranged on both sides of the recess have asymmetrical shapes relative to a central axis perpendicular to the bottom center of the recess.

The embodiment provides an optical lens in which a second exit surface and a third exit surface have an asymmetrical shape relative to a central axis perpendicular to the bottom center of the recess.

An embodiment provides a collimator lens of asymmetrical shape.

An embodiment provides a light unit having an optical lens having a straight or curved bar shape on a plurality of light emitting elements.

The embodiment provides an optical lens having a long length in the direction of arrangement of a plurality of light-emitting elements and a light unit having the same.

The embodiment provides an optical lens having a recess, an incident surface, and an exit surface in the arrangement direction of light emitting elements, and a light unit having the same.

An embodiment provides a light unit having one or more optical lenses arranged on a single circuit board.

The embodiment provides a light unit that allows light emitted from a plurality of optical lenses to be emitted in the same direction or in opposite directions.

A light unit and a lighting device having an optical lens and a light-emitting element according to an embodiment are provided.

An optical lens according to an embodiment comprises: a recess concave from a bottom surface in a lower portion of a transparent body; a plurality of incident surfaces having a first incident surface on an upper surface of the recess, and second and third incident surfaces corresponding to each other on opposite sides of the recess; a first total reflection surface and a second total reflection surface arranged on opposite sides of the body; and a first exit surface in an upper center of the body, and a second exit surface and a third exit surface on both sides of the first exit surface, wherein the first exit surface has a convex curved surface, the second exit surface has a convex curved surface, and the third exit surface includes a concave curved surface.

A lighting device according to an embodiment comprises: a housing having an open area therein; an optical member in the open area of the housing; a light emitting module having a plurality of light emitting elements and a circuit board on which the plurality of light emitting elements are arranged on the housing; an optical lens on a light emitting side of the light emitting module; an upper cover on the optical lens, the optical lens comprising: a recess which is concave from a bottom surface on a lower portion of a transparent body and has a length longer than a width in a first-axis direction; a plurality of incident surfaces having a first incident surface on an upper surface of the recess, and second and third incident surfaces corresponding to each other on opposite sides of the recess; a first total reflection surface and a second total reflection surface arranged on opposite sides of the body; and a first exit surface on an upper center of the body, and a second exit surface and a third exit surface on both sides of the first exit surface, wherein the first exit surface has a convex curved surface, the second exit surface has a convex curved surface, and the third exit surface includes a concave curved surface.

A light unit or lighting device having an optical lens according to an embodiment.

The embodiment can reduce noise such as hot spots caused by light emitted from an optical lens.

The embodiment can improve light uniformity in a light unit.

The embodiment can emit edge light with a uniform distribution through an optical lens.

The embodiment can improve the uniformity of light in a side-view type light unit.

The embodiment can improve the reliability of a light unit having an optical lens and a lighting device having the same.

Figure 1 is a perspective view showing an optical lens according to the first embodiment.
Figure 2 is an example of a side cross-sectional view of the optical lens of Figure 1.
FIG. 3 is an example of a cross-sectional side view for explaining the structure of the optical lens of FIG. 2.
Figure 4 is an enlarged view of the first incident surface of the optical lens of Figure 2.
FIG. 5 is a drawing showing an example of the first incident surface and the first exit surface of the optical lens of FIG. 2.
Figure 6 is a drawing for explaining the relationship between the first incidence surface and the second and third incidence surfaces in the optical lens of Figure 2.
FIG. 7 is a side cross-sectional view of a light unit having the optical lens of FIG. 1.
Fig. 8 is another example of the light unit of Fig. 7.
FIG. 9 is a drawing for explaining the light path that proceeds from the optical lens of FIG. 7 to the first incident surface and the first exit surface.
Figure 10 is a drawing for explaining the light path that proceeds from the optical lens of Figure 7 to the second and third incident planes and the second and third exit planes.
Figures 11 to 13 are examples of modifications of the light unit of Figure 7, examples having multiple light units.
Figures 14 and 15 are examples of modifications of the light unit of Figure 7, in which multiple light units are arranged on opposite sides.
Fig. 16 is an exploded perspective view of a lighting device having the optical lens of Fig. 1 in a lighting device according to the second embodiment.
Fig. 17 is a perspective view of the combined lighting device of Fig. 16.
Fig. 18 is a bottom view of the lighting device of Fig. 17.
Fig. 19 is a perspective view showing the AA side cross-section of the lighting device of Fig. 17.
Fig. 20 is a partially enlarged view of the lighting device of Fig. 19.
Fig. 21 is a front view showing the AA side cross-section of the lighting device of Fig. 17.
Fig. 22 is a drawing for explaining the light path by the optical lens of the lighting device of Fig. 21.
Fig. 23 is a drawing showing a light emitting element of the lighting device of Fig. 16.
Fig. 24 is a cross-sectional side view of the light emitting element of Fig. 23.
Fig. 25 is a drawing showing the light distribution of a lighting device according to an embodiment.

Hereinafter, embodiments of the present invention that can specifically achieve the above purpose will be described with reference to the attached drawings.

In the description of embodiments according to the present invention, when it is described that each element is formed "on or under", "on or under" includes both cases where two elements are directly in contact with each other or where one or more other elements are formed by being disposed (indirectly) between the two elements. In addition, when expressed as "on or under", it can include the meaning of not only the upward direction but also the downward direction based on one element.

The semiconductor device may include various electronic devices such as a light-emitting chip or a light-receiving chip, and both the light-emitting chip and the light-receiving chip may include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer. The semiconductor device according to the present embodiment may be a light-emitting chip. The light-emitting chip emits light when electrons and holes recombine, and the wavelength of the light is determined by the energy band gap inherent in the material. Therefore, the emitted light may vary depending on the composition of the material.

<Optical Lens>

FIG. 1 is a perspective view showing an optical lens according to a first embodiment, FIG. 2 is an example of a side sectional view of the optical lens of FIG. 1, and FIG. 3 is an example of a side sectional view for explaining the structure of the optical lens of FIG. 2.

Referring to FIGS. 1 to 3, an optical lens (300) according to an embodiment may be a transparent body, and may be arranged such that a length (Y1) in a second axis (Y) direction is greater than a width (X1) in a first axis (X) direction. The length (Y1) of the optical lens (300) may be three times or more the width (X1). The first axis (X) direction may be a width direction of the optical lens (300), and the second axis (Y) direction may be a length direction of the optical lens (300). The width of the optical lens (300) may be the same as the width of the exit surfaces (or the length in the X-axis direction), and the length may be the same as the length of the exit surfaces (or the length in the Y-axis direction).

The optical lens (300) according to the embodiment may be a bar shape having a straight shape. The straight bar may be arranged in a straight shape with the optical lens (300) having a predetermined length. The optical lens (300) may be a bar shape having a curved shape. The curved bar may be formed in a long length with the optical lens (300) having a predetermined curvature. The curved bar may be a bar shape in which the optical lens (300) has an exit surface (340, 342, 344) facing each other, or may be a bar shape in which the incident surface (310) or the bottom surface (302, 304) corresponds to each other. The curved bar may have a shape in which the lens centers are arranged on the same line, the lens centers are arranged in different directions, or the exit surfaces are gradually turned so that they face different directions.

The thickness (Z1) of the optical lens (300) according to the embodiment may be smaller than the width (X1) of the optical lens (300), for example, 1/2.5 or less of the width (X1) of the optical lens (300), for example, 1/2.5 to 1/1.8. If the thickness (Z1) of the optical lens (300) is smaller than the above range, the light extraction efficiency may be reduced, and if it is larger than the above range, the light efficiency may be reduced. The optical lens (300) according to the embodiment may reduce the number of lenses, and improve high brightness and light uniformity of illumination light.

The optical lens (300) may include a light-transmitting material. The optical lens (300) may include at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), silicone or epoxy resin, or glass. The optical lens (300) may have a refractive index of 2 or less and may include a transparent material having a range of, for example, 1.4 to 1.7.

As shown in FIGS. 2 and 3, the optical lens (300) includes a plurality of bottom surfaces (302, 304), a recess (315) concavely sunken between the plurality of bottom surfaces (302, 304), a plurality of incident surfaces (310, 312, 314) arranged on the recesses (315), a plurality of total reflection surfaces (332, 334) on the outside, and a plurality of exit surfaces (340, 342, 344) that emit light incident on the plurality of incident surfaces (310, 312, 314) and the total reflection surfaces (332, 334).

In the optical lens (300), the plurality of bottom surfaces (302, 304) are body bottom surfaces and include first and second bottom surfaces (302, 304). The first and second bottom surfaces (302, 304) may be arranged lengthwise along the longitudinal direction of the optical lens (300) and may be arranged on both sides of the recess (315). Here, the recess (315) may be concavely sunken in the light emission direction between the first and second bottom surfaces (302, 304). Second and third incident surfaces (312, 314) may be arranged on both sides in the width direction of the recess (315). Both sides in the longitudinal direction of the recess (315) may be open or may have different side surfaces arranged. The first and second bottom surfaces (302, 304) may support the optical lens (300). The above bottom surface (302, 304) may have a rough structure along the length direction, but is not limited thereto. The first and second bottom surfaces (302, 304) may be flat surfaces, rough surfaces, or may have protruding support protrusions.

The first bottom surface (302) may be arranged to overlap vertically with the second exit surface (342) so as to support a portion of the bottom of the optical lens (300). A portion of the first bottom surface (302) may overlap vertically with the area of the first exit surface (340) or the boundary area of the first and second exit surfaces (340, 342). The first bottom surface (302) may not overlap vertically with the first total reflection surface (332) or may be arranged inside the area of the first total reflection surface (332).

The second bottom surface (304) may be arranged to overlap vertically with the first exit surface (340) and support a portion of the bottom of the optical lens (300). A portion of the second bottom surface (304) may overlap vertically with an area of the third exit surface (344) or a boundary area of the first and third exit surfaces (340, 344). The second bottom surface (304) may not overlap vertically with the second total reflection surface (334) or may be arranged inside the area of the second total reflection surface (334).

The first and second bottom surfaces (302, 304) are arranged lengthwise and can be arranged parallel to each other with respect to the bottom center (ZO) of the recess (315). The width of each of the first and second bottom surfaces (302, 304) can be 2 mm or less, and for example, can be in the range of 0.5 mm to 2 mm. The width of the first and second bottom surfaces (302, 304) is the width on the axis (X0) horizontal to the bottom center (ZO) of the recess (315). If it is narrower than the above range, the strength may be reduced, and if it is larger than the above range, there is a problem that the width (X1) of the optical lens (300) becomes too large. The first and second bottom surfaces (302, 304) can have the same or different widths in the optical lens (300) having an asymmetrical structure.

The length of the recess (315) may be arranged to be long in the second axis direction, i.e., in the longitudinal direction. The length of the recess (315) may be the same as the length (Y1) of the optical lens (300). The length of the recess (315) may be shorter than the length (Y1) of the optical lens (300), and in this case, another incident surface or another total reflection surface may be arranged on the outer side in the longitudinal direction of the optical lens (300).

The above recess (315) may be arranged to have a predetermined depth and width from the bottom center (ZO). The recess (315) may have a shape in which the upper width (D3) is narrower than the bottom width (D2). The recess (315) may have a shape in which the width gradually narrows as it becomes deeper, and the difference between the upper width (D3) and the bottom width (D2) may have a difference of 0.8 mm or more, for example, a difference in the range of 0.8 mm to 1.2 mm. If the difference between the upper width (D3) and the bottom width (D2) of the recess (315) is larger or smaller than the above range, the incidence distribution of light may change. The bottom width (D2) of the recess (315) may be 3 mm or more, for example, a range of 3 mm to 4 mm, and the upper width (D3) of the recess (315) may be a range of 2 mm to 2.8 mm. The bottom width (D2) of the above recess (315) may be at least twice as wide as the width of the light-emitting element described later. The upper width (D3) of the above recess (315) may be arranged to be wider than the width of the light-emitting element described later, thereby preventing a decrease in the light incidence efficiency. Since the recess (315) is arranged to be long in the longitudinal direction, a plurality of light-emitting elements may be arranged inside, thereby maximizing the light incidence efficiency.

The above plurality of incident surfaces (310, 312, 314) are surfaces arranged inside the body and may be arranged on the upper surface and both side surfaces of the recess (315). The above plurality of incident surfaces (310, 312, 314) include a first incident surface (310) which is the upper surface of the recess (315), and second and third incident surfaces (312, 314) which are both side surfaces of the recess (315). The first incident surface (310) may be a curved surface, and may include, for example, a convex surface protruding toward the bottom of the recess (315). The first incident surface (310) may include a curved surface having a predetermined radius of curvature. Since the first incident surface (310) is provided as a downward convex surface, it can refract incident light so that it proceeds to the first exit surface (340).

The second and third incident surfaces (312, 314) may be facing or corresponding to each other. The second incident surface (312) may be positioned between the first incident surface (310) and the first bottom surface (302), and the third incident surface (314) may be positioned between the first incident surface (310) and the second bottom surface (304).

The second incident surface (312) may be a concave surface, and the concave surface may be a surface sunken in the direction of the first total reflection surface (332). Since the second incident surface (312) has a concave surface, it can suppress reflection of incident light and refract the incident light toward the first total reflection surface (332). As another example, the second incident surface (312) may be a convex surface or a flat inclined surface. The third incident surface (314) may be a concave surface, and the concave surface may be a surface sunken in the direction of the second total reflection surface (334). Since the third incident surface (314) has a concave surface, it can suppress reflection of incident light and refract the incident light toward the second total reflection surface (334). As another example, the third incident surface (314) may be a convex curved surface or a flat inclined surface.

As shown in FIG. 2, the plurality of exit surfaces (340, 342, 344) are surfaces arranged on the upper part of the body, and include a first exit surface (340) that is convex toward the center of the body, and second and third exit surfaces (342, 344) on both sides of the first exit surface (340). The first exit surface (340) can be arranged between the second and third exit surfaces (324, 344). The plurality of exit surfaces (340, 342, 3444) include a first exit surface (340) that refracts and emits light incident on the first incident surface (310), a second exit surface (342) that refracts and emits light incident through the second incident surface (312), and a third exit surface (344) that refracts and emits light incident through the third incident surface (314). The area of the first exit surface (310) can overlap vertically with the first incidence surface (310) and the second and third incidence surfaces (312, 314).

The first exit surface (340) may have a convex surface in the light emission direction, the second exit surface (342) may have a convex surface in the light emission direction, and the third exit surface (344) may have a concave surface that is sunken in the opposite direction of the light emission direction, for example, in the direction of the second total reflection surface (334). In an embodiment, the first and second exit surfaces (340, 342) are formed as convex surfaces, and the third exit surface (344) is arranged as a concave surface, so that light refracted by the third exit surface (344) can proceed in the direction of light refracted by the first and second exit surfaces (340, 342), and thus can be irradiated to different areas or mixed with each other.

The above-described plurality of total reflection surfaces (332, 334) are arranged along the length direction of the optical lens (300) as the width-wise side surfaces of the body, and reflect the path of the incident light in the emission direction. The above-described plurality of total reflection surfaces (332, 334) include first and second total reflection surfaces (332, 334), and the first total reflection surface (332) is arranged between the first bottom surface (302) and the second emission surface (342), and the second total reflection surface (334) is arranged between the second bottom surface (304) and the third emission surface (344). The above plurality of total reflection surfaces (332, 334) include a first total reflection surface (332) arranged on the outer side of the second incident surface (312) and the second exit surface (342), and a second total reflection surface (334) arranged on the outer side of the third incident surface (314) and the third exit surface (344).

The first total reflection surface (332) has an outwardly convex curve and reflects light incident on the second incident surface (312) onto the second exit surface (342). The second total reflection surface (334) has an outwardly convex curve and reflects light incident on the third incident surface (314) onto the third exit surface (344). Each of the first and second total reflection surfaces (332, 334) may include curves having different radii of curvature.

Referring to FIG. 2, the first exit surface (340) of the optical lens (300) is arranged in a center region on the exit side and has a convex curve in the direction of the central axis (P0), and may have a convex curve in the direction opposite to the first incident surface (310). The first exit surface (340) may include a curve having a smaller radius of curvature than the radius of curvature of the first incident surface (310).

The width (X2) of the first exit surface (340) may be arranged in a range of at least twice the width (D3) of the first incident surface (310), for example, 1.2 to 5 times. If the width (X2) of the first exit surface (340) is smaller than the above range, the amount of light incident on the first exit surface (340) through the first incident surface (310) may decrease or the thickness (Z1) of the optical lens (300) may decrease. If the width (X2) of the first exit surface (340) is larger than the above range, the improvement in emission efficiency may be minimal and the widths (X3) of the second and third exit surfaces (342, 344) may be different.

The first to third exit surfaces (340, 342, 344) may have the same length as the length (Y1) of the optical lens (300). Since the first to third exit surfaces (340, 342, 344) are arranged to have the same length as the recess (315), light incident through the first to third incident surfaces (310, 312, 314) may be refracted and emitted in the exit direction. As another example, the first exit surface (340) may have the same length as the length (Y1) of the optical lens (300), and the second and third exit surfaces (342, 344) may have shorter lengths than the length (Y1) of the optical lens (300). This means that among the two side walls (346, 348 in FIG. 1) of the optical lens (300), the areas adjacent to the first and second total reflection surfaces (332, 334) can be arranged as inclined surfaces. The two side walls (346, 348) of the optical lens (300) can be vertical planes, or the areas adjacent to the first and second exit surfaces (342, 344) can be formed as inclined surfaces.

In the embodiment, the optical lens (300) has an asymmetrical shape with respect to a central axis (P0) orthogonal to the bottom center (Z0). It can be seen that the centers of the first, second, and third incident surfaces (310, 312, 314) and the center of the first exit surface (340) are shifted from the central axis (P0), for example, in the direction of the first total reflection surface (334).

In the embodiment, at least one or both of the first incident surface (310) and the second exit surface (340) may have an asymmetrical shape with respect to a central axis (P0) perpendicular to the bottom center of the recess (315). For example, the first incident surface (310) may be formed to have an asymmetrical shape with respect to the central axis (P0). The first exit surface (340) may have an asymmetrical shape with respect to the central axis (P0).

In the embodiment, the second incident surface (312) and the third incident surface (314) have asymmetrical shapes with respect to a central axis (P0) perpendicular to the bottom center of the recess (315). The first total reflection surface (332) and the second total reflection surface (334) may have asymmetrical shapes with respect to the central axis (P0). The second exit surface (342) and the third exit surface (344) have asymmetrical shapes with respect to the central axis (P0). The recess (315) has asymmetrical shapes with respect to the central axis (P0). The asymmetrical shapes may be in the left/right direction or the width direction of the optical lens with respect to the central axis (P0) or the X-axis direction, or may be asymmetrical shapes in the X-axis direction.

In FIGS. 2 and 3, when looking at the thickness direction of the optical lens (300), the high point height (Z1) of the second exit surface (342) may be positioned higher than the high point height (Z2) of the third exit surface (344), and the low point height (Z3) of the second exit surface (342) may be positioned higher than the low point height (Z4) of the third exit surface (344). Here, the high point of the second exit surface (342) may be the boundary point (P3) between the second exit surface (342) and the first total reflection surface (332), the low point of the second exit surface (342) may be the boundary point (P1) between the first exit surface (340) and the second exit surface (342), the high point of the third exit surface (344) may be the boundary point (P4) between the third exit surface (344) and the second total reflection surface (334), and the low point of the third exit surface (344) may be the boundary point (P2) between the third exit surface (344) and the first exit surface (340). The height (Z5) of the peak of the first exit surface (340) may be positioned at a higher position than both points (P1, P2). The height (Z3) of the boundary point (P1) between the first and second exit surfaces (340, 342) may be positioned higher than the height (Z4) of the boundary point (P2) between the first and third exit surfaces (340, 342, 344). The height (Z6) of the boundary point (P5) between the first incidence surface (310) and the second incidence surface (312) may be positioned higher than the height (Z7) of the boundary point (P6) between the first incidence surface (310) and the third incidence surface (314). The heights of each of the points (P1, P2, P3, P4, P5, P6) may be based on a straight line (X0 in FIG. 2) horizontal to the bottom of the optical lens (300). Looking at the relationship between the above heights, they have the relationship Z1>Z2>Z3>Z4>Z6>Z7, and Z5 can have the relationship Z2>Z5>Z3>Z4.

This optical lens (300) can control the path of the emitted light by having an asymmetrical shape having a height difference between two points (P5, P6) of the first incident surface (310) and a height difference between two points (P1, P2) of the first exit surface (340), and can provide a uniform distribution of light by different optical paths.

In addition, the relationship between the width (X2) connecting the two points (P1, P2) of the first exit surface (340), the width (X3) connecting the two points (P1, P3) of the second exit surface (342), and the width (X4) connecting the two points of the third exit surface (344) may have a relationship of X3≥X2>X4. The widths (X2, X3, X4) represent straight line lengths in the horizontal direction.

Referring to FIG. 3, when looking at the angles of each point based on the bottom center (Z0) of the optical lens (300) and the central axis (P0), as an angle of the first incident surface (310), the angle (R1) between the point P5 and the central axis (P0) may be equal to or smaller than the angle (R2) between the point P6 and the central axis (P0). That is, R1≥R2, and R2 is in the range of 34 degrees to 38 degrees, and the difference between R1 and R2 may be 3 degrees or less. When the first incident surface (310) having such angles R1 and R2 is arranged on the recess (315), light emitted from the upper surface of the light-emitting element can be effectively incident. Since the above R1 and R2 have an angle less than half of the half-value angle in the light-direction angle of the light-emitting element, the first incident surface (310) can effectively receive light in the area between the second and third incident surfaces (312, 314).

Looking at the angle (R3) of the first exit surface (340), the angle R4 between the point P1 and the central axis (P0) with respect to the floor center (Z0) may be smaller than the angle R5 between the point P2 and the central axis (P0). The angle R5 between the point P3 and the point P1 may be larger than the angle R6 passing through the points P2 and P4. The R5 is the angle of the second exit surface (342), and R6 is the angle of the third exit surface (344), and they have a relationship of R5>R6, and the R5 may be 3 times or larger than R6, for example, 4 to 6 times larger. The angle (R3) of the first exit surface (340) may be 50 degrees or larger, and the angles R4 and R5 with respect to the central axis (P1) may be different from each other. Since the third exit surface (344) having the concave curved surface is arranged so that the angle R6 is less than 1/3 of the angle R5 of the second exit surface (342) having the convex curved surface, the amount of light emitted through the third exit surface (344) and the light path can be controlled.

In Fig. 4, looking at the structure of the first incident surface (310), with respect to the point P5 of the first incident surface (310), the tangent value (b1/b2) of the first triangle connecting the extended line of the tangent line of the first incident surface (310) from the point P5 and the central axis (P0) may be in the range of 0.5±0.02. The relationship between the height b1 and the base b2 of the triangle may be a relationship such that b1<b2, for example, b2 may be 1.5 times or more than b1. With respect to the point P6 of the first incident surface (310), the tangent value (b3/b4) of the second triangle connecting the extended line of the tangent line of the first incident surface (310) from the point P6 and the central axis (P0) may be in the range of 0.25±0.02. The relationship between the height b3 of the above triangle and the base b4 may be a relationship such that b3<b4, for example, b4 may be three times or more greater than b1. Here, the ratio of the tangent value of the first triangle to the tangent value of the second triangle may be in the range of 0.5±0.06, for example, the tangent value of the second triangle may be 1.5 times or more greater than the tangent value of the first triangle. This is because the heights of points P5 and P6 of the first incident surface (310) are different, and the light incident on the first incident surface (310) may be refracted to be incident on the first exit surface (340) due to the difference in tangent value due to the tangent line passing through the first incident surface (310).

Referring to FIG. 5, with respect to the central axis (P0) of the optical lens (300), the left region may have a ratio of a tangent value (c2/c1) of a first triangle connecting the center (101), the central axis (P0), and the point P5 of the upper surface of the light emitting element (100), and a tangent value (c3/c4) of a second triangle connecting the center (101), the central axis (P0), and the point P1 of the upper surface of the light emitting element (100) in a range of 1.5 or more, for example, 1.75±0.15. The tangent value (c2/c1) of the first triangle may be in a range of 0.6 or more and 0.9 or less, for example, 0.7±0.02, and the tangent value (c3/c4) of the second triangle may be in a range of 0.3 or more and 0.6 or less, for example, 0.4±0.02. The above c4 may be at least twice that of c1. The upper surface center (101) of the light emitting element (100) may be the center of the emission side and may be positioned higher by 0.5 to 1 mm than the bottom of the recess (315).

And, with respect to the central axis (P0) of the optical lens (300), the right region may have a ratio of the tangent value (e2/e1) of the third triangle connecting the center (101), the central axis (P0), and the point P6 of the upper surface of the light emitting element (100), and the tangent value (e3/e4) of the fourth triangle connecting the center (101), the central axis (P0), and the point P2 of the upper surface of the light emitting element (100) in a range of 0.9 or more and 1.5 or less, for example, 1.072±0.07. The tangent value (e2/e1) of the third triangle may be in a range of 0.6 or more and 0.9 or less, for example, 0.75±0.02, and the tangent value (e3/e4) of the fourth triangle may be in a range of 0.6 or more and 0.9 or less, for example, 0.7±0.02. The above e4 may be more than twice e1. The center of the upper surface of the above light-emitting element may be the center of the emission surface, and may be positioned higher than the bottom of the recess (315) by a range of 0.5 to 1 mm. Looking at the relationship between the tangent values of the first to fourth triangles, the tangent value of the second triangle may be greater than the tangent values of the first and fourth triangles, and the tangent value of the third triangle may be greater than the tangent value of the second triangle.

When the ratio of the tangent values of the first and second triangles is called the first ratio, and the ratio of the tangent values of the third and fourth triangles is called the second ratio, the relationship between the first ratio/second ratio may be 1.5 or more, for example, 1.5 or more and 1.9 or less.

Referring to FIG. 6, when looking at the relationship between the light-emitting element and the first to third incident surfaces (310, 312, 314), the tangent (c5/c1) value of the first triangle connecting the horizontal line to the upper surface of the light-emitting element (100) and the vertical line to point P5 may be 0.15 or more, for example, in the range of 0.20±0.02, and the tangent (e5/e1) value of the second triangle connecting the vertical line to point P6 may be 0.3 or more, for example, in the range of 0.34±0.02. Here, the tangent value of the first triangle may be smaller than the tangent value of the second triangle. The ratio of the tangent value of the first triangle and the tangent value of the second triangle may be 0.5 or more, for example, in the range of 0.5 to 0.7.

Referring to FIG. 7, a light unit according to an embodiment may have a circuit board (400) and a light-emitting element (100) placed under an optical lens (300). The light-emitting module may include the light-emitting element (100) and the circuit board (400), and the light unit may include the optical lens (300), the circuit board (400), and the light-emitting element (100).

The light emitting element (100) may be arranged one or more, for example, a plurality, in the longitudinal direction of the optical lens (300) on the circuit board (400). The plurality of light emitting elements (100) may be arranged along the optical lens (300) at a predetermined interval. The light emitting element (100) may be arranged in the recess (315) of the optical lens (300). The upper surface of the light emitting element (100), that is, the light emitting surface, may be arranged above the bottom of the recess (315). The light emitting element (100) may have one or a plurality of LED chips therein, and the thickness (D1) thereof may be 1.2 mm or less, for example, 1 mm or less.

The circuit board (400) may connect the plurality of light-emitting elements (100) to each other, for example, in series, in parallel, or in series-parallel. The circuit board (400) may be arranged under the optical lens (300) and may include a layer that absorbs or reflects light leaked from the optical lens (300). The optical axis of the light-emitting element (100) may be aligned with the central axis (P0) of the optical lens (300), so that the optical axis may be the central axis (P0). The light-emitting elements (100) may have shapes that are symmetrical with respect to the central axis (P0). With respect to the optical axis of the light-emitting element (100), the first incident surface (312) may have an asymmetrical shape. With respect to the optical axis of the light-emitting element (100), the second incident surface (312) and the third incident surface (314) may have asymmetrical shapes with respect to each other. With respect to the optical axis of the light-emitting element (100), the first exit surface (340) may have an asymmetrical shape. With respect to the optical axis of the light-emitting element (100), the second exit surface (342) and the third exit surface (344) on both sides of the first exit surface (340) may have asymmetrical shapes with respect to each other. With respect to the optical axis of the light-emitting element (100), the first total reflection surface (332) and the second total reflection surface (334) may have asymmetrical shapes with respect to each other.

The above circuit board (400) may include at least one of a resin material PCB, a metal core PCB (MCPCB, Metal Core PCB), and a flexible PCB (FPCB, Flexible PCB), but is not limited thereto. The light emitting element (100) may emit at least one or two or more of white, blue, green, red, yellow, and ultraviolet light, but is not limited thereto.

The width of the circuit board (400) may be wider than the bottom width (D2 of FIG. 2) of the recess (315) and may be 5 mm or more. The circuit board (400) may be in contact with the first and second bottom surfaces (302, 304) of the optical lens (300). The width of the circuit board (400) may be wider than the width of the optical lens (300) in order to reflect light traveling downward from the optical lens (300).

The length of the circuit board (400) is arranged to be longer than the length of the optical lens (300) (Y1 in FIG. 1), so that light leaked from the optical lens (300) can be absorbed or reflected. One or more optical lenses (300) can be arranged on the circuit board (400).

The light emitting element (100) may be placed within the recess (315) of the optical lens (300). The light emitting element (100) may be placed adjacent to the first incident surface (310), second and third incident surfaces (312, 314) of the recess (315). The lower surface of the light emitting element (100) may be placed above the bottom surface (302, 304) of the optical lens (300). The lower surface of the light emitting element (100) may be placed above the upper surface of the circuit board (400). The lower surface of the light emitting element (100) may be placed above the upper surface of the circuit board (400). When the light-emitting element (100) according to the embodiment emits light on at least three surfaces, light emitted from the light-emitting element (100) can be incident through the first incident surface (310) and the second and third incident surfaces (312, 314) of the optical lens (300). Accordingly, loss due to light emitted from the light-emitting element (100) can be reduced.

As shown in Fig. 8, the light emitting element may be placed below the recess (315). The light emitting element (100) may be placed on the same horizontal line as the bottom surface (302, 304) of the optical lens (300), or may be placed lower. Considering the light irradiance distribution of the light emitting element (100), the light emitting element (100) may be placed lower than the bottom surface of the optical lens (300), or the depth of the recess (315) may be reduced. In this case, the relationship between the upper surface center (101) of the light emitting element (100), the recess (315), and the incident surfaces may apply the relationship of Figs. 4 and 5. The depth of the recess (315) may be 2 mm or less.

Referring to Fig. 9, the angle of light traveling to the left region or upper region and the angle of light traveling to the right region or lower region can be compared based on the central axis (P0) of the optical lens (300). The left region or upper region can be defined as the first region, and the right region or lower region can be defined as the second region. The light traveling to the first region can be expressed as a positive (+) angle, and the light traveling to the second region can be expressed as a negative (-) angle.

Looking at the first region of the first exit surface (340), the first exit surface (340) of the optical lens (300) refracts the first light (L1) incident at the first angle (a1) with respect to the central axis (P0) on the first incidence surface (310) and exits at a second angle (a2). The first angle (a1) may be in the range of 0 degrees to +38 degrees, and the second angle (a2) may be an angle smaller than the first angle (a1). Here, the ratio of a2/a1 may be 0 or more and 1 or less, and may have, for example, a range of 0≤a2/a1≤1.

Looking at the second region of the first exit surface (340), the first exit surface (340) of the optical lens (300) refracts the second light (L2) that is incident on the first incident surface (310) at a first angle (b1) with respect to the central axis (P0) and exits at a second angle (b2). The first angle (b1) may be in a range of -36 degrees to 0 degrees, and the second angle (b2) may be an angle smaller than the first angle (b1). Here, the ratio of a2/a1 may be -0.7 or more and 0 or less, and may have a range of -0.7≤b2/b1≤0, for example. The light (L1, L2) exited through the first exit surface (340) may be exited in a direction away from the central axis (P0) with respect to the central axis (P0). This can refract the light (L1, L2) emitted from the first exit surface (340) not only horizontally, but also upwardly from the central axis (P0).

Referring to FIG. 10, when looking at the second exit surface (342) on the first area side, the second exit surface (342) of the optical lens (300) refracts the third light (L3) incident at a first angle (c1) with respect to the central axis (P0) to the second incident surface (312) and exits at a second angle (c2). The first angle (c1) may be in the range of 36 degrees to 60 degrees (±2), and the second angle (c2) may be an angle smaller than the first angle (c1). Here, the ratio of c2/c1 may be 0 or more and 0.1 or less, and may have, for example, a range of 0≤c2/c1≤0.1.

Looking at the third exit surface (344) on the second area side, the third exit surface (344) of the optical lens (300) refracts the fourth light (L4) incident at the third incidence surface (314) at a first angle (d1) with respect to the central axis (P0) and exits at a second angle (d2). The first angle (d1) may be in the range of -60 degrees to -36 degrees (±2), and the second angle (d2) may be an angle smaller than the first angle (d1). Here, the ratio of d2/d1 may be -0.2 or more and 0 or less, and may have a range of, for example, -0.2≤d2/d1≤0.

The light (L3) emitted through the second exit surface (342) can be emitted in a direction away from the central axis (P0) with respect to the central axis (P0). This allows the light (L3) emitted through the second exit surface (342) to be refracted so as to proceed in a direction higher than the central axis (P0), thereby forming a light distribution in the upper direction. In addition, the light (L4) emitted through the third exit surface (343) can be emitted in a direction approaching the central axis (P0) with respect to the central axis (P0). This allows the light (L4) emitted through the third exit surface (343) to proceed in a direction approaching the central axis (P0) from below the central axis (P0), thereby forming a light distribution in the upper direction.

As shown in FIGS. 9 and 10, the light (L1, L2, L3, L4) emitted through the first exit surface (340), the second exit surface (342), and the third exit surface (344) has different refractive angles and travels in the direction of the first region, so that it can be irradiated toward different targets on the first region. Accordingly, the light distribution can be provided as a uniform distribution.

Figures 11 to 15 are examples of modifications of light units according to embodiments.

Referring to FIG. 11, the first optical lens (300) of the first light unit and the second optical lens (300B) of the second light unit may be arranged parallel to each other, and the first optical lens (300) and the second optical lens (300B) may be arranged symmetrically to each other. For example, the first optical lens (300) has the second exit surface (342) arranged on the first region to the left with respect to the central axis (P0), and the second optical lens (300B) has the second exit surface (342) arranged on the second region to the right with respect to the central axis (P0). Accordingly, the first and second optical lenses (300, 300B) may irradiate light in opposite directions with respect to the center.

Referring to FIG. 12, the first optical lens (300) of the first light unit and the second optical lens (301) of the second light unit are arranged parallel to each other, and the first optical lens (300) and the second optical lens (301) can be arranged with the same structure. For example, the first optical lens (300) has the second exit surface (342) arranged on the first region to the left with respect to the central axis (P0), and the second optical lens (301) has the second exit surface (342) arranged on the first region with respect to the central axis (P0). Accordingly, the first and second optical lenses (300, 301) can irradiate light toward the first region with respect to the center.

Referring to FIG. 13, the first optical lens (300) of the first light unit and the second optical lens (300) of the second light unit may be arranged parallel to each other, and the first optical lens (300) and the second optical lens (300) may be arranged symmetrically to each other. For example, the first optical lens (300) has a second exit surface (342) arranged on the second region to the right with respect to the central axis (P0), and the second optical lens (300) has a second exit surface (342) arranged on the first region to the left with respect to the central axis (P0). Accordingly, the first and second optical lenses (300) may irradiate light toward the center with respect to the center.

Referring to FIG. 14, the first optical lens (300) of the first light unit and the second optical lens (300C) of the second light unit may face each other or be positioned on opposite sides. The first optical lens (300) and the second optical lens (300C) may be positioned symmetrically with respect to the center. For example, the first optical lens (300) has a second exit surface (342) positioned on the upper first region with respect to the central axis (P0), and the second optical lens (300C) has a second exit surface (342) positioned on the upper first region with respect to the central axis (P0). Accordingly, the first and second optical lenses (300, 300C) may irradiate light in the upper direction of the center. In this case, the first and second optical lenses (300, 300C) may have a reflective sheet (160A) or a reflective structure placed on the upper side, and a sheet (180A) for light transmission placed on the lower side. The sheet (180A) for light transmission may include at least one of a diffusion sheet, a prism sheet, or a transparent sheet. The first and second light units may be placed at the same height, or may be placed at different heights.

Referring to FIG. 15, the first optical lens (300) of the first light unit and the second optical lens (300) of the second light unit can be arranged to face each other. The first optical lens (300) and the second optical lens (300) can be arranged in opposite directions with respect to the center. For example, the second exit surface (342) of the first optical lens (300) is arranged on the upper first region with respect to the central axis (P0), and the third exit surface (344) of the second optical lens (300) is arranged on the lower first region with respect to the central axis (P0). Accordingly, the first and second optical lenses (300) can irradiate light in the upper/lower direction of the center. In this case, the first and second light units can be arranged at the same height or at different heights.

The optical lens (300) according to the embodiment may be a bar shape having a straight shape or a bar shape having a curved shape. For convenience of explanation, the following description will be given as an example of an optical lens (300) having a bar shape having a curved shape and a lighting device having the same.

FIG. 16 is an exploded perspective view showing a lighting device according to the first embodiment, which has the optical lens of FIG. 2, FIG. 17 is a combined perspective view of the lighting device of FIG. 16, FIG. 18 is a bottom view of the lighting device of FIG. 17, FIG. 19 is a perspective view showing a cross-section along the line A-A of the lighting device of FIG. 17, FIG. 20 is a partial enlarged view of the lighting device of FIG. 19, FIG. 21 is a front view showing a cross-section along the line A-A of the lighting device of FIG. 17, and FIG. 22 is a drawing for explaining an optical path by an optical lens of the lighting device of FIG. 21.

Referring to FIGS. 16 to 22, the lighting device includes a housing (110) having a circular outer perimeter and an open area (10) disposed at the bottom, a light emitting module (170) having a plurality of light emitting elements (173) arranged on the outer perimeter of the open area (10) of the housing (110), an optical lens (300) according to an embodiment on a light emitting side of the light emitting module (170), a heat dissipation frame (150) disposed at the rear of the light emitting module (170) and having an open area (50), an upper cover (160) coupled to the housing (110) on the outer side of the heat dissipation frame (150) and reflecting light emitted from the optical lens (300), and an optical member (180) disposed in the open area (105) of the housing (110) and diffusing and emitting light emitted by the optical lens (300) and light reflected by the upper cover (160).

As shown in FIGS. 16 to 19, the housing (110) has a lower circumference, for example, an outer shape, that is, a circular shape. The radius (r2) of the housing (110) may be 100 mm or more, for example, 130 mm or more, but is not limited thereto. The thickness of the lighting device having the housing (110) may be 10 mm or more, for example, 15 mm or more. The thickness of the lighting device may range from 15 mm to 30 mm. The lighting device may reduce the light diffusion space by employing an optical lens (300) therein. Here, the radius (r1) of the optical lens (300) may be 90 mm or more, for example, 110 mm or more. The optical lens (300) may be arranged in a ring shape, one or more, for example, two or more, within the lighting device. The two or more optical lenses (300) may have the same length or different lengths.

The housing (110) may be made of a plastic material, for example, at least one of PC (Polycarbonate), PETG (Polyethylene Terephthalate Glycol), PE (polyethylene), PSP (polystyrene paper), PP (polypropylene), and PVC (polyvinyl chloride). The housing (110) may be formed of a material having high light reflectivity, or a reflective layer may be further formed on the inner surface. The housing (110) may be made of a metal or a non-metallic material. In the case of the metal, it may include at least one of aluminum, an aluminum alloy, silver, and a silver alloy.

As shown in Fig. 20, the housing (110) may have an outer portion (112) on its outer periphery. A light-emitting module (170) is arranged within the outer portion (112). The outer portion (112) may be combined with the outer portion (165) of the upper cover (160). The outer portion (112) may be formed integrally with the housing (110) or may be combined with a separate material. The outer portion (112) may protrude outwardly from the outer periphery of the housing (110), thereby reinforcing the rigidity of the outer periphery of the housing (110) and facilitating combination with the outer portion (165) of the upper cover (160).

The outer portion (112) of the housing (110) includes a recess (27) on the inner side, and the recess (26) can be joined with an outer protrusion (155) of the heat dissipation frame (150). The support portion (113) of the housing (110) supports the outer periphery of the optical member (180).

A plurality of fastening holes (17) can be arranged in the above housing (110), and a fastening means can be fastened to these fastening holes (17) through the fastening holes (16) of the outer portion (165) of the upper cover (160).

A heat dissipation frame (150) is coupled to the housing (110), and a lower portion of a heat dissipation part (151) of the heat dissipation frame (150) can be inserted into a groove (20) of the housing (110). The groove (20) can be formed in a circular shape along the lower portion of the heat dissipation frame (150). The heat dissipation frame (150) is a heat dissipation body made of a metal material and can dissipate heat generated from the light-emitting module (170). The heat dissipation frame (150) can include at least one of Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Cu, Au, and Hf, or an optional alloy having at least one. The heat dissipation frame (150) can be laminated in a single layer or multiple layers.

The above heat dissipation frame (150) may be formed wider than the width (height) of the circuit board to increase heat dissipation surface area for heat dissipation efficiency.

The optical lens (300) may be placed on the light-emitting module (170) and may be placed on the support member (153) of the heat-dissipating frame (150). The support member (153) of the heat-dissipating frame (150) may support the optical lens (300) from being sagged and press the upper surface of the optical member (180). The support member (153) of the heat-dissipating frame (150) may protrude inwardly and may be placed between the upper surface of the optical member (180) and the optical lens (300).

The light-emitting module (170) may include a circuit board (171) and a plurality of light-emitting elements (173) arranged on the inside of the circuit board (171). At least one or a plurality of circuit boards (171) may be arranged in a circular shape. The circuit board (171) may be a flexible board, and as another example, may include at least one of a printed circuit board (PCB) made of a resin material, a metal core PCB (MCPCB), and a ceramic board. As another example, the light-emitting module (170) may have a light-emitting element adhered to another member without the circuit board (171). The circuit board (171) may be attached to a heat-radiating portion (151) of the heat-radiating frame using an adhesive material or a heat-radiating adhesive. The circuit board (171) may be arranged perpendicular to the heat-radiating portion (151). The back surface of the circuit board (171) may be arranged at an angle of 90 degrees to the horizontal axis, or may be arranged in a range of 90 degrees or more and 120 degrees or less. That is, the circuit board (171) may be arranged at an angle of 90 degrees or more to the horizontal axis, thereby reducing the amount of light directly irradiated to the optical member (180) among the light emitted from the light emitting element (173).

The emission surface of the light emitting element (173) may be arranged to correspond to or be misaligned with the opposite circuit board (171). The emission surface of the light emitting element (173) may be arranged at an angle of 90 degrees or more with respect to the horizontal axis. The light emitting element (173) may be arranged in one or two or more rows on the circuit board (171), but is not limited thereto. The light emitting element (173) may emit at least one of blue, red, green, white, and UV, and may emit white light for illumination, for example. The light emitting element (173) may be mounted on the circuit board (171) in a chip form or a package form, and in this case, the beam angle of the light emitting element (173) may be 115 degrees or more, for example, in the range of 118 degrees to 160 degrees, but is not limited thereto.

The light-emitting element (173) according to the embodiment may include, for example, a warm white light-emitting element (Warm white LED) and a cool white light-emitting diode (Cool white LED) on the circuit board (171). The warm white light-emitting diode and the cool white light-emitting diode are elements that emit white light. Since the warm white light-emitting diode and the cool white light-emitting diode can emit white light of mixed light by emitting a correlated color temperature, the color rendering index (CRI) indicating that it is close to natural sunlight increases. Therefore, it is possible to prevent the color of an actual object from being distorted and reduce eye fatigue of the user.

The optical lens (300) may be formed in a ring shape, one or more, within the lighting device. The plurality of optical lenses may be two or three or more, but is not limited thereto. The optical lens (300) is an optical lens of an embodiment, and for example, the structure and description as in FIG. 2 will be referred to.

Here, the upper cover (160) may be made of a plastic material or a resin material. The upper cover (160) may be a highly reflective resin material. The upper cover (160) may be formed of, for example, PET poly(ethylene terephthalate), PC (polycarbonate), PVC poly(vinyl chloride) resin, etc., but is not limited thereto. The reflective resin material may be formed as a highly reflective resin material by adding impurities to a resin material such as silicone or epoxy. The impurities may include at least one of materials such as SiO ₂ , TiO ₂ , Al ₂ O ₃ , and MgO. The upper cover (160) may have a reflective surface (163) corresponding to the optical member (180) under the reflective portion (161), and the reflective surface (163) may be a highly reflective surface or a rough surface. By employing an optical lens (300) in the embodiment, the reflective surface of the optical member (180) can be provided as a flat or horizontal plane. The reflective surface can be a flat surface, or can include a concave curved surface and/or a convex curved surface. A reflective material can be coated or applied on the reflective surface (163), or a highly reflective material can be roughly formed.

The outer periphery of the optical member (180) can be sandwiched between the support member (153) of the heat dissipation frame (150) and the support member (113) of the housing (110), so that external movement is blocked and light leakage can be prevented. The optical member (180) can include a diffusion sheet. The diffusion sheet diffuses incident light, so that it can be irradiated to the illumination area with a uniform brightness. The optical member (180) can include at least one of a diffusion material, for example, polymethyl methacrylate ( PMMA ), polypropylene (PP), polyethylene (PE), and polystyrene (PS). A plurality of optical sheets can be arranged on the optical member (180), but the present invention is not limited thereto. The lower periphery of the optical member (180) can be prevented from being sagging by the support member (113) of the housing (110).

As shown in Fig. 2, the optical lens (300) may have the first exit surface (340) positioned above the third exit surface (344), and the second exit surface (342) positioned above the first exit surface (340). Light emitted through the first and second exit surfaces (340, 342) of the optical lens (300) may be emitted upward with respect to the central axis (P0), for example, toward the reflection portion (161) of the upper cover (160). In addition, light emitted through the third exit surface (344) of the optical lens (300) may travel in the direction of the central axis (P0) or toward the reflection portion (161) of the upper cover (160). The light emitted by the first, second, and third emission surfaces (340, 342, 344) of the optical lens (300) is irradiated to different areas of the upper cover (160), thereby providing a uniform light distribution. In this case, the light with a uniform distribution can be irradiated toward the optical member by the upper cover (160).

Referring to FIG. 19 and FIG. 22, the center point of the upper cover (160) is defined as (0.0), and the light-emitting module parts on opposite sides are defined as light-incident parts, for example, the left side can be defined as the left light-incident part, and the right side can be defined as the right light-incident part. When the left light incident point is designated as (-1,0) with respect to the center point of the upper cover (160), the right light incident point is designated as (1,0), the midpoint between the center point and the left light incident point is designated as (-0.5), and the midpoint between the center point and the right light incident point is designated as (0.5), with respect to the left light incident point, the first light emitted through the first exit surface (340) of the first region as shown in FIG. 9 proceeds to the -0.5 point, and the second light emitted through the second exit surface (342) of the second region proceeds to the 0.25 point, and as shown in FIG. 10, the light emitted through the second exit surface (342) of the first region proceeds to the center point, and the light emitted through the third exit surface (344) of the second region proceeds to the center point. That is, since the light emitted from the optical lens (300) of one side of the light-incident portion covers the area from the -0.5 point to the 0.25 point on the opposite side of the upper cover (160), the entire area of the upper cover (160) can be irradiated by the light emitted from the optical lens (300), which is a ring-shaped light-incident portion. The light traveling to the first, second, and third (340, 342, 344) optical lenses (300) is irradiated with a uniform distribution to the entire area of the upper cover (160).

The upper cover (160) reflects the incident light as described above to the optical member (180), and the optical member (180) further diffuses the light with a uniform distribution, thereby emitting it. Accordingly, the hot spot problem in the emitted light can be suppressed, and a uniform light intensity distribution as in FIG. 25 can be achieved. Looking at the discomfort index (UGR: Unified glare rating) of the lighting device of the present invention, it was found to be 19 or less, indicating that there is no discomfort glare to the user. According to the CIE standard, a discomfort index (UGR) of 21 or more is classified as being uncomfortable for the user.

FIGS. 23 and 24 are drawings showing examples of light-emitting elements in a lighting device or optical lens according to an embodiment.

Referring to FIGS. 23 and 24, the light-emitting element (173) includes, for example, a body (210) having a concave portion (260), a plurality of lead frames (221, 231) within the concave portion (260), and at least one light-emitting chip (271, 272) within the concave portion (260).

The body (210) may include an insulating material or a conductive material. The body (210) may be formed of at least one of a resin material such as polyphthalamide (PPA), silicon (Si), a metal material, PSG (photo sensitive glass), sapphire (Al ₂ O ₃ ), and a printed circuit board (PCB). For example, the body (210) may be made of a resin material, such as polyphthalamide (PPA), epoxy, or silicon. A filler, such as a metal oxide such as TiO ₂ or SiO ₂ , may be added to the epoxy or silicon material used as the body (210) to increase reflection efficiency. The body (210) may include a ceramic material. The body (210) may include a circuit board as another example, and may include at least one of a resin material substrate (PCB), a substrate having a heat-dissipating metal (Metal Core PCB), and a ceramic substrate. The above body (210) may be formed in a dark color or black to improve contrast, but is not limited thereto.

The body (210) includes a concave portion (260) having a predetermined depth. The concave portion (260) may be formed in a shape such as a concave cup structure, a cavity structure, or a recess structure from the upper surface (25) of the body (210), but is not limited thereto. The side wall of the concave portion (260) may be perpendicular to the floor or inclined, and two or more of the side walls may be arranged to be inclined at the same angle or different angles. A reflective layer of a different material may be further arranged on the surface of the concave portion (260), but is not limited thereto.

The shape of the above body (210) may be formed as a polygonal structure such as a triangle, square, or pentagon when viewed from above, or may be a shape having a circle, an ellipse, or a curved surface, or may be a polygonal shape with curved corners, but is not limited thereto.

The outer surface of the body (210) may be formed as a surface that is perpendicular or inclined to the lower surface of the body (210). The length (Y5) of the body (210) may be different from the width (X5), for example, the length (Y5) may be at least twice, for example, at least three times, the width (X5), and may be shorter than the maximum length (Y6) of the light-emitting element (173). The longitudinal direction of the body (210) is a direction orthogonal to the width direction. A plurality of light-emitting chips (271, 272) may be arranged in the longitudinal direction within the light-emitting element (173).

In the light-emitting element (173), a plurality of light-emitting chips (271, 272) can be arranged at a predetermined interval in the longitudinal direction. In terms of heat dissipation, the light-emitting element (173) can have each light-emitting chip (271, 272) arranged on an individual lead frame (221, 231), or a plurality of light-emitting chips arranged on a single lead frame. In addition, by arranging the length of the light-emitting element (173) to be longer than its width, the heat dissipation efficiency of each light-emitting chip (271, 272) can be improved, and the size of the light-emitting chip (271, 272) can be increased, thereby providing a high-brightness element.

A plurality of lead frames (221, 231) are arranged in the concave portion (260) of the body (210). The plurality of lead frames (221, 231) include at least two or three or more metal frames, and may include, for example, first and second lead frames (221, 231). The first and second lead frames (221, 231) may be separated by a gap portion (219).

One or more light-emitting chips (271, 272) may be placed in the concave portion (260). The plurality of light-emitting chips (271, 272) may include at least two or three or more LED chips, and may include, for example, first and second light-emitting chips (271, 272). One or more light-emitting chips (271, 272) may be placed on at least one of the plurality of lead frames (221, 231), and for example, at least one light-emitting chip (271, 272) may be placed on each of the plurality of lead frames (221, 231). The plurality of light-emitting chips (271, 272) may be selectively connected to the plurality of lead frames (221, 231). Each of the light-emitting chips (271, 272) may be defined as a light source.

At least one of the plurality of lead frames (221, 231) may include a cavity having a depth lower than the bottom of the recessed portion (260). The first lead frame (221) includes a first cavity (225), and the first cavity (225) is sunken to a depth lower than the bottom of the recessed portion (260). The first cavity (225) includes a concave shape from the bottom of the recessed portion (260) toward the lower surface of the body (210), for example, a cup structure or a recessed shape. The first cavity (225) may be formed by bending or etching the first lead frame (221), but is not limited thereto.

The side wall and the bottom of the first cavity (225) are formed by the first lead frame (221), and the peripheral side wall of the first cavity (225) may be formed to be inclined from the bottom of the first cavity (225). Two opposing side walls of the first cavity (225) may be inclined at the same angle or may be inclined at different angles. The frame thickness of the side wall and the bottom of the first cavity (225) may be the same thickness as the thickness of the first lead frame (221).

The second lead frame (231) includes a second cavity (235), and the second cavity (235) is sunken to a depth lower than the bottom of the concave portion (260). The second cavity (235) includes a concave shape, for example, a cup structure or a recess shape, from the upper surface of the second lead frame (231) or the bottom of the concave portion (260) toward the lower surface of the body (210). The second cavity (235) may be formed by bending or etching the second lead frame (231), but is not limited thereto. The bottom and side walls of the second cavity (235) are formed by the second lead frame (231), and the side walls of the second cavity (235) may be formed to be inclined from the bottom of the second cavity (235). Among the side walls of the second cavity (235), two corresponding side walls may be inclined at the same angle or may be inclined at different angles. The frame thickness of the side walls and bottom of the second cavity (235) may be the same thickness as the thickness of the second lead frame (231).

The bottom shape of the first cavity (225) and the second cavity (235) may be a polygon or a polygonal shape with a partial curved surface, or a circle or an ellipse, but is not limited thereto.

The lower surfaces of the first lead frame (221) and the second lead frame (231) are exposed to the lower portion of the body (210) and may be arranged on the same plane as or on a different plane from the lower surface of the body (210). The lower surfaces of the first lead frame (221) and the second lead frame (231) include opposite surfaces of the bottoms of the first and second cavities (225, 135). The opposite surfaces of the bottoms of the first and second cavities (225, 135) may be exposed to the lower surface of the body (210).

The first lead frame (221) includes a first lead portion (223), and the first lead portion (223) may protrude from an outer side surface of the body (210). The second lead frame (231) includes a second lead portion (233), and the second lead portion (233) may protrude from an outer side surface of the body (210). One or more first lead portions (223) may protrude, and one or more second lead portions (233) may protrude. The first and second lead portions (223, 233) may protrude in opposite directions with respect to the concave portion (260).

The first lead frame (221) and the second lead frame (231) may include at least one of a metal material, for example, titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), tantalum (Ta), platinum (Pt), tin (Sn), silver (Ag), and phosphorus (P), and may be formed as a single layer or multiple layers. The thickness of the first and second lead frames (221, 231) may be formed to be 0.15 mm or more, for example, in the range of 0.18 mm to 1.5 mm. When the thickness of the first and second lead frames (221, 231) is less than 0.15 mm, it is difficult to perform injection molding. In addition, if the thickness of the first and second lead frames (221, 231) exceeds 1.5 mm, the thickness and size of the light-emitting element (173) may increase, which may cause an increase in material costs. In addition, if the thickness of the first and second lead frames (221, 231) is less than 0.15 mm, the electrical characteristics and heat dissipation characteristics may deteriorate.

The thickness of the first and second lead frames (221, 231) may be formed to the same thickness, but is not limited thereto. The first and second lead frames (221, 231) function as lead frames that supply power. In addition to the first and second lead frames (221, 231), a metal frame for heat dissipation or an intermediate frame for electrical connection between the first and second lead frames (221, 231) may be further arranged in the concave portion (260), but is not limited thereto.

A first light-emitting chip (271) is placed in the first cavity (225) of the first lead frame (221). For example, the first light-emitting chip (271) may be bonded to the first cavity (225) with an adhesive, but is not limited thereto. A second light-emitting chip (272) is placed in the second cavity (235) of the second lead frame (231). For example, the second light-emitting chip (272) may be bonded to the second cavity (235) with an adhesive, but is not limited thereto. The adhesive may be an insulating adhesive or a conductive adhesive. The insulating adhesive may include a material such as epoxy or silicone, and the conductive adhesive may include a bonding material such as solder.

The first and second light-emitting chips (271, 272) can selectively emit light in a range from a visible light band to an ultraviolet band, and can be selected from, for example, an ultraviolet LED chip, a red LED chip, a blue LED chip, a green LED chip, a yellow green LED chip, and a white LED chip. The first and second light-emitting chips (271, 272) include an LED chip including at least one of a compound semiconductor of a group III-V element and a compound semiconductor of a group II-VI element. The first and second light-emitting chips (271, 272) may have a horizontal chip structure in which two electrodes within the chip are arranged adjacent to each other, or may be arranged as vertical chips arranged on opposite sides, but are not limited thereto. When the light-emitting chips (271, 272) are horizontal chips, a lower insulating substrate may be bonded to a lead frame using an insulating or conductive adhesive. Alternatively, if the light-emitting chip (271, 272) is a vertical chip, the lower electrode of the vertical chip may be electrically connected to the lead frame using a conductive adhesive.

The first light-emitting chip (271) may be connected to the first lead frame (221) arranged at the bottom of the recessed portion (260) by the first wire (273) and may be connected to the second lead frame (231) by the second wire (274), but is not limited thereto. The second light-emitting chip (272) may be connected to the first lead frame (221) by the third wire (275) and may be connected to the second lead frame (231) arranged at the bottom of the recessed portion (260) by the fourth wire (276), but is not limited thereto.

The light-emitting element (173) may include a protection element. The protection element may be disposed on a part of the first lead frame (221) or the second lead frame (231). The protection element may be disposed within the body (210). The protection element may be implemented as a thyristor, a zener element, or a TVS (transient voltage suppression), and the zener element protects the light-emitting chip (271, 272) from ESD (electro static discharge). The protection element may be connected in parallel to the connection circuit of the first light-emitting chip (271) and the second light-emitting chip (272).

A molding member (281) may be formed in at least one or all of the above-mentioned concave portion (260), the first cavity (225), and the second cavity (235). The molding member (281) includes a light-transmitting resin layer such as silicone or epoxy, and may be formed in a single layer or multiple layers. At least one type of fluorescent substance may be added to the molding member (281).

The surface of the above molding member (281) may be formed in a flat shape, a concave shape, a convex shape, etc., but is not limited thereto.

The light-emitting element (173) may be a blue light-emitting element or a white light-emitting element with a high color rendering index (CRI). The light-emitting element (173) may be a light-emitting element that emits white light by molding a synthetic resin containing a fluorescent substance on top of a blue light-emitting chip. Here, the fluorescent substance may include at least one of a garnet type (YAG, TAG), a silicate type, a nitride type, and an oxynitride type.

The above fluorescent material includes at least one or a plurality of blue fluorescent materials, cyan fluorescent materials, green fluorescent materials, yellow fluorescent materials, and red fluorescent materials, and may be arranged in a single layer or multiple layers. The fluorescent film has a fluorescent material added to a light-transmitting resin material. The light-transmitting resin material includes a material such as silicone or epoxy, and the fluorescent material may be selectively formed from YAG, TAG, silicate, nitride, and oxy-nitride materials. The resin layer (260) may include a fluorescent material such as a quantum dot. The quantum dot may include a II-VI compound or a III-V group compound semiconductor, and may include at least one or different types of red, green, yellow, and red quantum dots. The quantum dot is a nanometer-sized particle that may have optical properties arising from quantum confinement. The specific composition(s), structure, and/or size of the quantum dot may be selected in order to cause light of a desired wavelength to be emitted from the quantum dot when stimulated by a specific excitation source. Quantum dots can be tuned to emit light across the visible spectrum by varying their size. The quantum dots can comprise one or more semiconductor materials, examples of which include Group IV elements, Group II-VI compounds, Group II-V compounds, Group III-VI compounds, Group III-V compounds, Group IV-VI compounds, Group I-III-VI compounds, Group II-IV-VI compounds, Group II-IV-V compounds, alloys comprising any of the foregoing, and/or mixtures comprising any of the foregoing, including ternary and quaternary mixtures or alloys. The quantum dots can be, for example, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, GaN, GaP, GaAs, GaSb, InP, InAs, InSb, AlS, AlP, AlAs, PbS, PbSe, Ge, Si, CuInS ₂ , CuInSe ₂ , MgS, MgSe, MgTe, and the like, and combinations thereof.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified and implemented in other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the above description has been made with reference to examples, these are merely examples and do not limit the present invention, and those with ordinary knowledge in the field to which the present invention pertains will recognize that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. And the differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

100,173: Light-emitting element 300: Optical lens
302,304: Bottom surface 310: First entrance surface
312: 2nd entrance surface 314: 3rd entrance surface
315: Recess 332,334: Fully oblique
340: 1st exit surface 342: 2nd exit surface
344: 3rd exit surface 171,400: Circuit board

Claims (15)

A concave recess from the bottom surface on the lower part of the transparent body;
A plurality of incident surfaces having a first incident surface on the upper surface of the recess, and second and third incident surfaces corresponding to each other on both sides of the recess;
First and second reflective surfaces arranged on opposite sides of the transparent body; and
The transparent body includes a first exit surface at the upper center, a second exit surface and a third exit surface on both sides of the first exit surface,
The above first projection surface has a convex surface,
The above second projection surface has a convex surface,
The above third projection surface has a concave surface,
The above first incident surface has a convex surface toward the bottom surface of the recess,
The above second and third incidence surfaces have concave curves,
Z1 to Z5 have the relationship Z1>Z2>Z5>Z3>Z4,
The above Z1 represents the height from the bottom surface of the recess to the highest point of the second exit surface,
The above Z2 represents the height from the bottom surface of the recess to the highest point of the third projection surface,
The above Z3 represents the height from the bottom surface of the recess to the lowest point of the second exit surface,
The above Z4 represents the height from the bottom surface of the recess to the lowest point of the third exit surface,
The above Z5 is an optical lens representing the height from the bottom surface of the recess to the highest point of the first exit surface. In the first paragraph,
The first incident surface and the first exit surface have an asymmetrical shape based on a central axis perpendicular to the bottom center of the recess,
An optical lens in which the second incidence surface and the third incidence surface have asymmetrical shapes with respect to the central axis, and the second exit surface and the third exit surface have asymmetrical shapes with respect to the central axis. In the first paragraph,
An optical lens whose center of the first projection surface is spaced apart from a central axis perpendicular to the bottom center of the recess. In the first paragraph,
The boundary point between the first and second incident surfaces is positioned higher than the boundary point between the first and third incident surfaces,
An optical lens in which the boundary point between the first exit surface and the second exit surface is positioned higher than the boundary point between the first exit surface and the third exit surface. A housing having an open area inside;
An optical member in the open area of the above housing;
A light-emitting module having a plurality of light-emitting elements and a circuit board on which the plurality of light-emitting elements are arranged on the housing;
An optical lens on the light emitting side of the above light emitting module;
Having an upper cover on the above optical lens,
The above optical lens,
A recess on the lower part of the transparent body, which is concave from the bottom surface and has a length longer than the width in the first axis direction;
A plurality of incident surfaces having a first incident surface on the upper surface of the recess, and second and third incident surfaces corresponding to each other on both sides of the recess;
First and second reflective surfaces arranged on opposite sides of the body; and
The upper center of the above body includes a first exit surface, a second exit surface and a third exit surface on both sides of the first exit surface,
The above first projection surface has a convex surface,
The above second projection surface has a convex surface,
The above third projection surface has a concave surface,
The above first incident surface has a convex surface toward the bottom of the recess,
The above second and third incidence surfaces have concave curves,
Z1 to Z5 have the relationship Z1>Z2>Z5>Z3>Z4,
The above Z1 represents the height from the bottom surface of the recess to the highest point of the second exit surface,
The above Z2 represents the height from the bottom surface of the recess to the highest point of the third projection surface,
The above Z3 represents the height from the bottom surface of the recess to the lowest point of the second exit surface,
The above Z4 represents the height from the bottom surface of the recess to the lowest point of the third exit surface,
The above Z5 is a lighting device indicating the height from the bottom surface of the recess to the highest point of the first exit surface. In paragraph 5,
The above optical member has a circular shape,
A lighting device in which the optical lens is formed as a curved surface having a curvature, and light emitted through the first, second, and third emission surfaces is irradiated to different areas of the upper cover.

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