TW202100902A - Lighting device including plural light-emitting modules, a lens cover, and a diffuser cover - Google Patents

Abstract

The present invention provides a lighting device 1 including: a plurality of light-emitting modules 20 having a plurality of LED light sources 22; a lens cover 30 covering plural light-emitting modules 20; and a translucent diffuser cover 40 covering the lens cover 30. In addition, the lens cover 30 includes: plural lenses 31, 32 to control the light distribution of the light emitted from the plurality of LED light sources 22; and a light guide part 33 corresponding to a boundary portion K between two adjacent light-emitting modules 20 among the plural light-emitting modules 20. The light guide part 33 includes a light extraction part 33b for extracting a part of the light emitted into the lens cover 30.

Description

Lighting fixture

The invention relates to a lighting appliance.

The conventional lighting fixture of Patent Document 1 includes: a plurality of light-emitting modules with a plurality of light-emitting elements; a lens cover with a plurality of lenses, which respectively cover the plurality of light-emitting elements, and control the light emitted from the plurality of light-emitting elements The light distribution of light; and the light diffusion cover, which is transparent and covers the lens cover. [Literary Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2018-181602

[Problems to be solved by the present invention]

Generally, in a boundary portion of two adjacent light-emitting modules among a plurality of light-emitting modules, connectors and wires for electrical connection with each other are provided, so it is not easy to arrange a light source. Therefore, when the lighting fixture emits light, the boundary part may look dark.

Therefore, an object of the present invention is to provide a lighting fixture that can emit light with suppressed uneven brightness. [Technical means to solve the problem]

In order to achieve the above object, an aspect of the lighting fixture of the present invention includes: a plurality of light-emitting modules having a plurality of light sources; a lens cover that covers the plurality of light-emitting modules; and a translucent diffuser cover that covers the lens Cover; The lens cover has: a plurality of lenses to control the light distribution of the light emitted from the plurality of light sources; and a light guide portion corresponding to the boundary between the two adjacent light-emitting modules in the plurality of light-emitting modules Part; The light guide part has a light extraction part that takes out a part of the light incident on the lens cover. [Effects of the invention]

According to the present invention, light with suppressed uneven brightness can be emitted.

Hereinafter, the embodiments of the present invention will be described with reference to the drawings. The embodiments described below all show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, the arrangement positions and connection forms of the components, etc. shown in the following embodiments are merely examples, and the gist does not limit the present invention. Therefore, among the constituent elements of the following embodiments that are not described in the independent claims, they will be described as arbitrary constituent elements.

In addition, each figure is a schematic diagram, not strictly an illustration. In addition, in each figure, the same symbol is given to the substantially same structure, and the repeated description is abbreviate|omitted or simplified.

In addition, in the following embodiments, a slightly parallel expression is used. For example, slightly parallel means not only parallel but also substantially parallel, that is, for example, an error of several% is included. In addition, a little parallel means parallel in the range in which the effects of the present invention can be obtained. The performance of other uses of "略" is also the same.

In the following description, the direction parallel to the optical axis of the light emitted by the LED (Light Emitting Diode) light source is the Z-axis direction, and the direction perpendicular to the Z-axis direction is defined as the X-axis direction and the Y-axis direction.

Hereinafter, the lighting fixture according to the embodiment of the present invention will be described.

(Implementation form) [Composition: Lighting Equipment 1] Fig. 1 is a perspective view showing the overall configuration of a lighting fixture 1 of the embodiment.

As shown in Fig. 1, the lighting fixture 1 is a lighting device that emits light that can illuminate the surroundings. Specifically, the luminaire 1 is, for example, a ceiling lamp, which is installed in building materials such as ceilings and walls of facilities such as houses and used to illuminate the interior space of the facilities. The lighting fixture 1 is fixed to the construction building material by the fixture installation member or the like. Building materials are components that make up ceilings, walls, etc.

2 and 3, the structure of the lighting fixture 1 is demonstrated. Fig. 2 is an exploded perspective view of the lighting fixture 1 of the embodiment. 3 is a cross-sectional view showing a cross-section of the lighting fixture 1 of the embodiment along the line III-III in FIG. 1.

As shown in FIGS. 2 and 3, the lighting fixture 1 includes a housing 10, a plurality of light-emitting modules 20, a lens cover 30, and a diffusion cover 40.

＜Chassis 10＞ The housing 10 is formed, for example, by pressing sheet metal such as aluminum plate or steel plate. The housing 10 has a disc shape and is a storage body that houses the light-emitting module 20 and the lens cover 30. In this embodiment, when viewed from the Z-axis direction, a substantially circular opening 10a is formed in the central portion of the housing 10.

In the opening 10a, an appliance mounting member (not shown) for mounting the housing 10 on a suspended ceiling lamp holder (not shown) is provided. The appliance installation component can be assembled with the suspended ceiling lamp holder installed in the construction material in a manner that can be assembled and disassembled at will. In addition, the appliance mounting member is used to mount the housing 10 in a arbitrarily detachable manner to the joint of the suspended ceiling lamp holder of the construction material. That is, the opening 10a is formed at a position corresponding to the suspended ceiling lamp holder, and is a through hole for arranging the suspended ceiling lamp holder.

In addition, the suspended ceiling lamp holder is electrically connected to a commercial power source (not shown) via a wire (not shown). By attaching the lighting fixture 1 to the suspended ceiling lamp holder via the fixture mounting member, power is supplied to a power supply circuit (not shown) included in the lighting fixture 1. The power supply circuit is a circuit that generates power for causing the light-emitting module 20 to emit light, and converts AC power supplied through the appliance mounting member into DC power. By supplying the DC power to the light emitting module 20, the light emitting module 20 emits light. That is, the appliance installation component connects the lighting appliance 1 and the suspended ceiling lamp holder mechanically and electrically.

In addition, the housing 10 also functions as a heat sink for dissipating heat from the light-emitting module 20.

Furthermore, it is also possible to mount a cushioning member (not shown) formed of urethane or the like on the surface on the construction material side (the surface on the positive Z-axis direction) of the housing 10. The buffer member is arranged along the shape of the housing 10. When the luminaire 1 is installed in a construction building material, by sandwiching a buffer member between the housing 10 and the construction building material, the swing or rotation of the housing 10 is suppressed.

＜Light-emitting module 20＞ The light-emitting module 20 is, for example, a module that emits light, and is a module for indoor lighting that brightens the entire room. The light emitting module 20 is arranged on the surface on the negative Z-axis side of the bottom 11 of the housing 10, that is, the mounting surface, and is held by the housing 10 to irradiate light to the surroundings.

As shown in FIG. 2, a plurality of light emitting modules 20 are arranged in a circular ring shape in the bottom 11 of the housing 10. Two adjacent light-emitting modules 20 among the plurality of light-emitting modules 20 are electrically connected to each other by connectors (not shown), wires (not shown) and other connecting parts. That is, the connecting portion is arranged at the boundary portion K of two adjacent light emitting modules 20. The boundary portion K refers to the edge of the two adjacent light-emitting modules 20 as the boundary and the portion near the boundary (the edge).

As shown in FIGS. 2 and 3, the light-emitting module 20 has a substrate 21 and a plurality of LED light sources 22.

The substrate 21 is an embedding substrate having an embedding surface for embedding the LED light source 22. The substrate 21 is formed of a plurality of pieces into a substantially circular ring shape. The plurality of substrates 21 are respectively fixed to the housing 10 by fixing members such as screws on the mounting surface on the negative Z-axis side of the bottom 11 of the housing 10 so as to surround the opening 10 a of the housing 10. Specifically, the substrate 21 is fixed to the housing 10 in a state of being slightly parallel to the X-Y plane so that the mounting surface faces the negative direction of the Z axis. In this embodiment, three arc-shaped substrates 21 form a circular ring shape. However, the number of substrates 21 is not limited to this form, and may be two or less, or four or more. The substrate 21 may be arranged in a ring shape so as to surround the opening 10a. That is, in this embodiment, a plurality of light emitting modules 20 are installed in the housing 10.

As the substrate 21, for example, a metal base substrate obtained by applying an insulating coating to a base material composed of a metal material such as aluminum or copper, a ceramic substrate made of a sintered body of a ceramic material such as alumina, or a resin substrate based on a resin material Wait. In this embodiment, as the substrate 21, a printed wiring substrate composed of a glass epoxy substrate on which metal wiring is formed is used. In addition, the substrate 21 may be a rigid substrate or a flexible substrate.

The plurality of LED light sources 22 are arranged in a slightly arc shape along the shape of the substrate 21. That is, the plurality of substrates 21 are arranged in a ring shape, and therefore, the plurality of LED light sources 22 are arranged in a plurality of annular rows according to the plurality of substrates 21, that is, arranged in a concentric circle. In this embodiment, 7 rows are arranged in the radial direction. In addition, in FIG. 2, the plural LED light sources 22 are not shown. The LED light source 22 is an example of a light source.

The plurality of LED light sources 22 are configured to emit white light, for example. Specifically, the plural LED light sources 22 are composed of COB (Chip On Board) type LED elements, and have plural blue LEDs which are bare chips (LED chips) embedded on the substrate 21, and these blue LEDs. A sealing member for LED sealing, the sealing member containing a yellow phosphor. In addition, the plurality of LED light sources 22 can also emit light of more than two colors. Specifically, the plural LED light sources 22 may also be three-color LED light sources of RGB, emitting red, blue, and green light, and emitting monochromatic light of these three colors. Borrow to obtain colored light or white light.

In addition, the plurality of LED light sources 22 may also be surface mount (SMD: Surface Mount Device) type LED components in which LEDs are packaged, with a container (package), a plurality of LED chips embedded in the container, and A sealing member for sealing multiple LED chips. The sealing member is a transparent insulating resin material such as silicone resin. In addition, light diffusing materials such as silica and fillers can also be dispersed in the sealing member.

In this embodiment, the plurality of LED light sources 22 irradiate light in a direction slightly parallel to the negative direction of the Z-axis. Specifically, the optical axis of the plurality of LED light sources 22 is the main emission direction of light, which is a direction slightly parallel to the negative direction of the Z axis.

The plurality of LED light sources 22 configured in this way are embedded in the substrate 21. In this embodiment, the three substrates 21 are each embedded in plural.

＜Lens cover 30＞ 4 is a plan view showing the lens cover 30 and the light emitting module 20 of the lighting fixture 1 of the embodiment.

As shown in FIGS. 3 and 4, the lens cover 30 is an optical member for controlling the light distribution of the light from the plurality of LED light sources 22, respectively. The lens cover 30 is formed of a light-transmitting material (for example, transparent resin such as polymethylmethacrylate (PMMA), polycarbonate (PC), etc.).

The lens cover 30 is formed in an annular shape along the shape in which the plurality of substrates 21 are arranged. When viewing the lens cover 30 and the housing 10 from the positive direction of the Z axis, the opening 30 a of the lens cover 30 is approximately the same as the opening 10 a of the housing 10. That is, the center axis of the lens cover 30 passing through the center of the opening surface constituting the opening 30a is approximately the same as the center axis of the housing 10 passing through the center of the opening surface constituting the opening 10a.

Viewed from the positive direction of the Z axis, the lens cover 30 is arranged in the negative direction of the Z axis of the light emitting module 20 to cover the light emitting module 20. In addition, the lens cover 30 is fixed to the bottom 11 of the housing 10 via a base plate 21 by a fixing member such as screws. That is, the lens cover 30 is fixed to the housing 10 in a posture slightly parallel to the XY plane to cover the plurality of LED light sources 22 and the substrate 21.

In this embodiment, there is one lens cover 30, but it may be a lens cover 30 composed of a plurality of arcs in accordance with the substantially arc-shaped shape of the substrate 21. For example, it can also be provided so that three lens covers 30 cover the light emitting module 20.

Fig. 5 is a cross-sectional view showing a cross section of the lens cover 30 of the lighting fixture 1 of the embodiment along the line VV in Fig. 4.

As shown in FIGS. 4 and 5, the lens cover 30 includes a plurality of lens assembly portions 31a, a light guide portion 33, a connecting portion cover 35, and an extension portion 30c extending toward the inner periphery of the plurality of lenses 31.

The plural lens assembly parts 31a correspond to the plural light emitting modules 20 one to one. The plural lens assembly portion 31a is an assembly that gathers one or more lenses 31 and 32 (hereinafter, the lenses 31 and 32 may also be referred to as the lens 3). That is, the lens cover 30 is provided with a plurality of lens regions E, and one or more lenses 3 among the plurality of lenses 3 are dispersed in a plurality of places. In this embodiment, the lens cover 30 has three lens regions E. The lens assembly portion 31a has a lens area E formed by a plurality of lenses 3. In the present embodiment, the lens assembly portion 31a has a plurality of lenses 3 for controlling the light distribution of the light rays respectively emitted from the plurality of LED light sources 22. The plural lenses 3 are composed of plural lenses 31 and 32.

The plurality of lenses 3 cover the plurality of LED light sources 22 in a one-to-one correspondence with the plurality of LED light sources 22. That is, the lens 3 corresponds to the LED light source 22; the plurality of lenses 3 are arranged in a plurality of annular rows (hereinafter referred to as lens rows), that is, arranged concentrically. The lens row is a ring-shaped row with a plurality of lenses 3 as a group, along the arrangement of the plurality of LED light sources 22, and arranged in the circumferential direction.

A plurality of lenses 3 constituting the lens row are connected in the circumferential direction. Specifically, the lens 3 connects two lenses 3 adjacent in the circumferential direction in the circumferential direction.

Using FIG. 6, the thickness of the lens 31 of the connecting portion 39a will be described. 6 is a cross-sectional view showing a cross-section of the lens cover 30 of the lighting fixture 1 of the embodiment along the VI-VI line in FIG. 4.

As shown in FIG. 6, the height of the connecting portion 39a (thickness in the Z-axis direction) of the two lenses 31 adjacent in the circumferential direction is higher than the height of the outer peripheral edge of the non-connected portion 39b of the lens 31 (thickness in the Z-axis direction) higher. That is, the thickness H2 of the connecting portion 39a of the two lenses 31 adjacent in the circumferential direction is thicker than the thickness H1 of the non-connecting portion 39b of the two lenses 31 adjacent in the radial direction.

In addition, in the plural lenses 31, the diameter a of the outermost periphery of the lens 31 and the distance b (also referred to as pitch) between the central axes of the two adjacent lenses 31 satisfy 0.75<(b/a)< 1. The diameter a of the outermost periphery of the lens 31 refers to the diameter of the circular or arc-shaped lens 31 when the lens 31 is viewed from the Z axis direction. Therefore, the two adjacent lenses 31 overlap at most about one-fourth of the diameter, and the outermost periphery of the lens 31 contacts at least. Here, two adjacent lenses 31 are described as an example, but the combination of the lens 31 and the lens 32 may be the same.

The light emitted by each LED light source 22 is transmitted through a plurality of lenses 3, so the light distribution of the transmitted light is controlled and emitted.

7 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light rays emitted from the lens 31 of the lens cover 30 of the lighting fixture 1 of the embodiment. As shown in FIG. 7, a plurality of lenses 31 emit light having a light distribution peak toward the center portion of the diffuser 40. Therefore, a part of the lens 31 among the plurality of lenses 31 has different light distribution characteristics. That is, the light distribution characteristics of the lens 3 vary depending on the position in the lens cover 30.

As shown in Figs. 3 and 7, for example, one or more lenses 31 arranged on the central part side of the diffuser cover 40 when viewed from the direction in which the lens cover 30 and the diffuser cover 40 overlap the plural lenses 31 emit The light having a light distribution peak toward the center portion of the diffuser 40. Specifically, the lens row disposed near the opening 30 a of the lens cover 30, that is, on the inner edge side, emits light having a light distribution peak toward the center of the diffuser cover 40 from the exit surface 132. In addition, in the plurality of lens rows, the light distribution characteristic of a wide light distribution is obtained from the vicinity of the opening 30a of the lens cover 30, that is, the inner peripheral side toward the outer peripheral side. That is, in the present embodiment, as the lens row from the innermost circumference of the lens cover 30 moves toward the lens row at the outermost circumference, the light distribution characteristic gradually becomes a broad light distribution.

Each lens 31 is a lens 31 that emits light having two light distribution peaks. Specifically, each lens 31 is a lens 31 having a bat-wing light distribution characteristic, that is, there are two light distribution peaks on opposite sides of the optical axis. That is, the lens cover 30 is provided with a plurality of lenses 31 having a bat-wing-shaped light distribution characteristic, and performs light distribution control that expands the light distribution angle of the light emitted from the light emitting module 20.

In addition, the light distribution angle of each lens 31 as the light distribution peak may be determined, for example, according to the arrangement position of the LED light source 22 and the height of the diffusion cover 40 relative to the lens cover 30.

Among the plurality of lenses 31, the respective exit surfaces 132 of the plurality of lenses 31 constituting the lens row located at the outermost periphery of the lens cover 30 are continuous with the outer peripheral edge of the lens cover 30. Specifically, when viewing the lens cover 30 from the positive direction of the Z axis, the outer peripheral edge of the lens 31 is inscribed with the outer peripheral edge of the lens cover 30. That is, between the outer peripheral edge of the lens 31 and the outer peripheral edge of the lens cover 30, the flange of the lens cover 30 is not formed.

As shown in FIG. 5, the plurality of lenses 31 respectively have an incident surface 131 on which the light emitted from the LED light source 22 enters, and an exit surface 132 on which the light incident on the incident surface 131 is emitted.

The incident surface 131 is a surface opposite to the light emitting surface of the LED light source 22, and is a surface on which the light emitted by the LED light source 22 enters. The incident surface 131 is a surface on the positive Z axis side of the lens 31, and is a surface on the opposite side to the output surface 132.

The incident surface 131 has a first recess 141 and a second recess 142.

The first recess 141 is recessed in the direction in which the light emitted from the LED light source 22 enters. That is, the first recess 141 is recessed in the direction away from the LED light source 22 (the negative direction of the Z axis). The inner surface 141a of the first recess 141 constitutes a part of the incident surface 131 on which the light emitted by the LED light source 22 enters, and has a parabolic, conical, or truncated cone shape.

When viewed from the direction in which the lens 31 and the LED light source 22 overlap (Z-axis direction), the LED light source 22 overlaps the first recess 141. That is, the first recess 141 is formed at a position opposite to the LED light source 22 and located in the negative direction of the Z axis of the LED light source 22.

The second recess 142 is located on the outer periphery of the first recess 141 and is recessed in the direction in which the light rays emitted from the LED light source 22 are incident. That is, the second recess 142 is recessed in the direction away from the LED light source 22 (the negative direction of the Z axis). When the second recess 142 and the first recess 141 are observed, the second recess 142 is a concentric annular recess formed with respect to the first recess 141.

The inner surface of the second recess 142 constitutes a part of the incident surface 131 on which the light emitted from the LED light source 22 enters. In this embodiment, the concave shape of the second concave portion 142 is continuous with the concave shape of the first concave portion 141. That is, the first recess 141 is formed in the inside (bottom) of the second recess 142.

The second recess 142 has an inclined surface 142b and an opposite incident surface 142a.

The inclined surface 142b is inclined with respect to a surface (X-Y plane) perpendicular to the optical axis of the LED light source 22 along the emission direction of the light rays emitted from the LED light source 22. Specifically, the inclined surface 142 b is an annular surface inclined in a direction away from the LED light source 22 with respect to the XY plane. That is, the inclined surface 142b is a push-out surface. Therefore, the light emitted by the LED light source 22 is not easily incident on the inclined surface 142b.

In addition, if the angle of the inclined surface 142b with respect to the surface perpendicular to the optical axis (X-Y plane) of the inclined surface 142b is θ, 30°≧θ>5° is satisfied.

The opposing incident surface 142a is a surface facing the emission direction, and when the LED light source 22 and the lens 31 are superimposed and viewed, it is an annular surface surrounding the LED light source 22. In addition, the opposing incident surface 142a is formed on the outer peripheral side of the inclined surface 142b. The opposite incident surface 142a constitutes a part of the incident surface 131 on which the light emitted from the LED light source 22 is incident. In this embodiment, the opposite incident surface 142a is a surface inclined to the Z-axis direction, but it may be a surface that is slightly parallel to the Z-axis direction.

The surface of the first connecting portion 142d connecting the opposite incident surface 142a and the inclined surface 142b is a curved surface in the shape of an arc in a cross-sectional view. The first connecting portion 142d has an annular shape.

The surface of the second connecting portion 142c of the first recess 141 and the second recess 142 is an arc-shaped curved surface in a cross-sectional view. That is, the arc-shaped curved surface is a surface that connects the inner surface 141 a of the first recess 141 and the inclined surface 142 b of the second recess 142. The second connecting portion 142c is a circular protrusion. The second connecting portion 142c is arranged on the negative side of the Z-axis than the imaginary surface extending the light-emitting surface of the LED light source 22. That is, the second connecting portion 142c does not surround the LED light source 22.

In addition, the distance from the virtual surface to the surface of the second connecting portion 142c from the second connecting portion 142c is about 1 mm or less.

As described above, in this embodiment, the light distribution characteristics of a part of the plurality of lenses 31 are different. This is achieved by changing the depth of the first recess 141 and the second recess 142. For example, the depth of the first concave portion 141 and the second concave portion 142 deepens as the lens row moves from the innermost lens row in the lens cover 30 to the outermost lens row.

At least one of the surface of the first connecting portion 142d, the surface of the second connecting portion 142c, the inclined surface 142b, and the opposite incident surface 142a is a rough surface that diffuses light. In this embodiment, the surface of the first connection portion 142d, the surface of the second connection portion 142c, the inclined surface 142b, and the opposite incident surface 142a are rough surfaces that diffuse light. The inner surface 141a of the first recess 141 is not a rough surface. The rough surface is configured to have light diffusibility by performing diffusion processing. For example, the rough surface may be fine irregularities formed by surface treatment such as surface embossing. In addition, in order to improve the light diffusibility, a rough surface may be further included in the light diffusing material.

The exit surface 132 is a surface on which the light emitted by the LED light source 22 and transmitted through the interior is emitted. The exit surface 132 is the surface of the lens 31 on the negative side of the Z axis.

The exit surface 132 is formed with a concave portion 132a in which the central axis of the lens 31 (line approximately coincident with the optical axis of the light source) is recessed in the positive direction of the Z axis, so as to suppress the emission of light rays slightly parallel to the Z axis direction from the lens 31. The concave portion 132a is a slightly conical concave portion; the portion approximately coincident with the central axis of the lens 31 approximately coincides with the bottom end of the concave portion 132a.

The exit surface 132 has a circular shape when viewed from the positive Z-axis side. In addition, since the two adjacent lenses 31 are connected in the circumferential direction, the two adjacent lenses 31 are connected so that the exit surfaces 132 of the two adjacent lenses 31 are continuous. That is, the lens row constitutes an annular exit surface 132.

In addition, the exit surface 132 may be formed with fine unevenness (surface embossing) by surface embossing or the like, or it may be milky white in which the light diffusing material is dispersed inside.

Although the shape of the lens 32 when viewed from the negative direction side of the Z axis and the direction of the light distribution peak are different from those of the lens 31, other configurations are the same as those of the lens 31, and different points will be described, and descriptions of the same configurations will be omitted.

8 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light emitted from the lens 32 disposed on the light guide 33 side of the lighting fixture 1 of the embodiment along the line VIII-VIII in FIG. 4.

As shown in FIG. 8, one or more lenses 32 arranged on the light guide 33 side emit light toward the light guide 33 side. That is, the light distribution peak portions of the light rays respectively emitted from the lenses 32 are directed toward the portion of the diffusion cover 40 facing the light guide portion 33. The extension lines of the light distribution peak portions of the light rays respectively emitted from the lenses 32 intersect the portion of the diffuser 40 facing the light guide portion 33. The light rays respectively emitted from the lenses 32 enter the portion of the diffusion cover 40 that faces the light guide portion 33. That is, the direction of the light distribution peak of the lens 32 is different from the direction of the light distribution peak of the lens 31 and crosses the direction of the light distribution peak of the lens 31.

Fig. 9 is a partially enlarged view showing the lens cover 30 of the lighting fixture 1 of the embodiment.

In addition, as shown in FIG. 9, when the lens cover 30 is viewed from the negative direction side of the Z axis, the lens 32 has a slightly elliptical shape or a spindle shape. One or more lenses 32 are arranged on the light guide 33 side. The plurality of lenses 32 are arranged along the boundary line H between the light guide 33 and the lens area E. In this embodiment, a plurality of lenses 32 are arranged in the radial direction.

As shown in FIGS. 4 and 9, the light guide portion 33 corresponds to the boundary portion K of two adjacent light-emitting modules 20 among the plurality of light-emitting modules 20. That is, the light guide portion 33 overlaps the boundary portion K when viewed from the direction in which the lens cover 30 and the light emitting module 20 overlap. That is, since the light guide portion 33 does not overlap with the LED light source 22 of the light-emitting module 20, the light emitted by the LED light source 22 does not directly enter.

The light guide portion 33 is provided between two adjacent lens assembly portions 31a among the plurality of lens assembly portions 31a. In other words, the light guide 33 is provided between two adjacent lens regions E among the plurality of lens regions E. In this embodiment, the light guide portion 33 is partitioned into the inner peripheral side (the opening 30a side) and the outer peripheral side by the connecting portion cover 35.

10 is a cross-sectional view showing a cross-section of the light guide portion 33 of the lens cover 30 of the lighting fixture 1 of the embodiment on the XX line of FIG. 9.

As shown in FIGS. 4, 9 and 10, the light guide portion 33 has a first surface 33a1, a second surface 33a2, a light extraction portion 33b, a thin portion 34b, and a thick portion 34a.

The first surface 33a1 is a surface on the positive side of the Z-axis, and is a reflection surface that reflects light. The first surface 33a1 is a surface facing the boundary portion K of two adjacent light emitting modules 20. In this embodiment, the light extraction portion 33b is formed on the first surface 33a1. The first surface 33a1 corresponds to the surface on the light-emitting module 20 side. The first surface 33a1 is a surface parallel to the X-Y plane.

The second surface 33a2 is the exit surface from which the light guided by the light guide 33 is emitted, and is a flat surface without surface embossing or the like. The second surface 33a2 is a surface facing the diffusion cover 40 and is a surface on the negative direction side of the Z axis. The second surface 33a2 corresponds to the surface on the diffuser cover 40 side. The second surface 33a2 is a surface parallel to the X-Y plane.

The light extraction portion 33b is a light extraction structure that extracts a part of the light rays incident on the lens cover 30. The light extraction portion 33b is formed on the first surface 33a1 or the second surface 33a2. In this embodiment, the light extraction portion 33b is formed on the first surface 33a1.

When the light extraction portion 33b is formed on the first surface 33a1, and when the light guided by the light guide portion 33 enters the light extraction portion 33b, the light extraction portion 33b indirectly emits the light by reflecting toward the second surface 33a2. In addition, when the light extraction portion 33b is formed on the second surface 33a2, when the light guided by the light guide portion 33 enters the light extraction portion 33b, the light extraction portion 33b directly emits the light.

In this embodiment, the light extraction portion 33b is formed as a concave-convex-shaped groove that is concave in the negative direction of the Z-axis. In addition, the light extraction portion 33b may be a plurality of grooves formed by a plurality of protrusions protruding in the positive direction of the Z-axis. For the plural grooves, the longitudinal direction (extending direction, extension direction) of the plural grooves is formed as a direction intersecting the circumferential direction of the lens cover 30. The length direction of the light guide portion 33 on the inner peripheral side of the lens cover 30 and the light extraction portion 33 b is along the radial direction of the lens cover 30. The length direction of the light guide portion 33 on the outer peripheral side of the lens cover 30 and the light extraction portion 33b follows the shape of the edge of the plurality of lenses 32 on the light guide portion 33 side. That is, the plurality of grooves (light extraction portion 33b) are formed such that the longitudinal direction of the plurality of grooves is along the boundary line H between the lens area E and the light guide portion 33. In this embodiment, the light extraction portion 33b is formed symmetrically with respect to the center line of the light guide portion 33 in the radial direction including the lens cover 30. In addition, the light extraction portion 33b is formed across the thick portion 34a from the thin portion 34b.

In addition, as shown in FIG. 10, the cross-sectional shape of the light extraction portion 33b is a triangular wave shape. That is, the cross-sectional shape of the light extraction portion 33b is constituted by a triangular convex portion or a triangular concave portion. In addition, in this embodiment, the front end of the convex portion constituting the light extraction portion 33b or the bottom portion of the recess constituting the light extraction portion 33b may be flat or curved. That is, the triangular wave shape is a little triangular wave shape.

The acute angle θ between the extended surface of the inner surface of the light extraction portion 33b and the first surface 33a1 is 45° to 65°. In particular, the angle θ is preferably 55°.

In addition, the light extraction portion 33b may also be a ridge formed by a concave portion or a convex portion, and may have a fine structure. That is, the light extraction portion 33b may be, for example, a cone shape such as a cone shape and a pyramid shape, a truncated cone shape such as a truncated cone shape and a truncated cone shape, and a column shape such as a cylindrical shape and a pyramid shape. In addition, the light extraction portion 33b may have a light reflecting material that reflects and guides the light, so that the light is emitted from the second surface 33a2. The light reflecting material may be provided on the surface of the light extraction portion 33b, or the light extraction portion 33b may be used as a base material to be provided inside the light extraction portion 33b.

As shown in FIG. 9, the connection part cover 35 is a cover which covers the connection part which connects two adjacent light-emitting modules 20 mutually. The connecting portion cover 35 is arranged between the light guide portion 33 on the inner peripheral side of the lens cover 30 and the light guide portion 33 on the outer peripheral side of the lens cover 30. The connection part cover 35 is formed integrally with the lens assembly part 31 a and the light guide part 33.

As shown in FIGS. 9 and 10, the thin portion 34b is a portion of the light guide portion 33 where the thickness in the Z-axis direction is thinner than the thick portion 34a. The thin portion 34b is formed on the inner peripheral side of the lens cover 30 from the periphery of the connecting portion cover 35 and the thick portion 34a. This is because it has the property of easily generating bubbles and the like in the center portion of the lens cover 30 when the lens cover 30 is molded. By making the inner peripheral side of the lens cover 30 a thin portion 34b, the bubbles and the like are suppressed produce. Therefore, by making the inner peripheral side of the lens cover 30 a thin portion 34b, it is possible to suppress a decrease in the yield of the lens cover 30.

The thickness of the thin portion 34b is the distance from the first surface 33a1 on the side of the plurality of light emitting modules 20 to the second surface 33a2 on the side of the diffuser 40, and is equivalent to the thickness H1 of the non-connected portion 39b in FIG. The surface on the negative Z-axis direction side of the thin portion 34b is a part of the second surface 33a2.

The thick portion 34a of the light guide portion 33 is the thicker portion from the first surface 33a1 on the side of the light emitting module 20 to the second surface 33a2 on the side of the diffuser 40 in the light guide portion 33. The thick portion 34a is formed in the central portion of the light guide portion 33 on the outer peripheral side of the lens cover 30 and the inner peripheral side of the lens cover 30 along the circumferential direction. The thickness of the thick portion 34a is thicker than the thickness H1 of the non-connected portion 39b, and thinner than the thickness of the lens 3. The thickness of the lens 3 is the distance from the first surface 33a1 to the exit surface 132.

The thick portion 34a has an inclined surface portion that is inclined toward the thin portion 34b. In addition, the surface on the negative Z-axis direction side of the thick portion 34a is a part of the second surface 33a2.

The extension portion 30c is formed on the inner peripheral side of the lens cover 30 and extends (projects) from the position where the plurality of lenses 31 are arranged toward the central axis side. That is, the extension portion 30c extends toward the central axis side to narrow the opening 30a (to reduce the opening area of the opening 30a). The extension portion 30c is a plate-shaped portion that is slightly parallel to the X-Y plane, and has a fan shape when viewed from above. In the present embodiment, two extensions 30c are provided at the target positions, but there may be one, or three or more.

＜Diffusion mask 40＞ As shown in FIGS. 2 and 3, the diffuser cover 40 is an optical member that covers the lens cover 30 and diffuses the light incident from the lens cover 30 toward the outside to be emitted. The diffuser cover 40 is supported by the housing 10 in a state of being separated by a predetermined distance from the lens cover 30. Specifically, the diffuser cover 40 has a circular shape when viewed from the Z-axis direction, and is supported by the housing 10 so that the central axis thereof approximately coincides with the opening 30a of the lens cover 30 and the opening 10a of the housing 10.

The diffuser 40 has translucency. For example, the diffusion cover 40 is formed of a light-transmitting material such as polymethyl methacrylate resin. For example, the diffuser 40 may use a milky white diffuser in which the light diffuser is dispersed. In addition, on the surface of the diffuser 40, fine unevenness (surface embossing) may be formed by surface embossing or the like. Thereby, the light incident from the lens cover 30 to the diffusion cover 40 is transmitted through the diffusion cover 40 to be scattered. Thereby, it is possible to reduce the unevenness of brightness exhibited in the diffuser 40 when the diffuser 40 is viewed from the negative direction of the Z axis.

[Operation] When the LED light source 22 emits light from these lighting fixtures 1, almost all of them enter the inner surface 141a of the first recess 141 of the lens 3. The light incident on the inner surface 141a of the first recess 141 passes through the lens 3 and exits from the exit surface 132 corresponding to the incident first recess 141. In addition, a part of the light emitted by the LED light source 22 enters the opposite incident surface 142 a of the second recess 142. The light incident on the opposite incident surface 142 a of the second concave portion 142 is directed toward the adjacent lens 3 and exits from the exit surface 132 of the lens 3.

The light rays are emitted from the plural lens assembly portion 31 a having plural lenses 3 and enter the diffuser 40. The light incident to the diffuser 40 diffuses when passing through the diffuser 40 and exits from the diffuser 40 to illuminate the surroundings.

In addition, a part of the light incident on the incident surface 131 of the lens 31 is guided to the light guide 33. For example, light rays and the like incident on the opposing incident surface 142 a of the second recess 142 are guided to the light guide 33. The light guided by the light guide portion 33 is reflected by the light extraction portion 33b formed on the first surface 33a1, and is thereby emitted from the second surface 33a2 of the light guide portion 33. Each lens 32 has a light distribution characteristic toward a portion of the diffuser 40 facing the light guide portion 33, so this portion is not easy to darken. Therefore, the lighting fixture 1 of this embodiment can emit light with high uniformity.

In addition, each lens 31 has a light distribution characteristic toward the center part, so even if the LED light source 22 is not arranged at the center part, the center part of the diffuser 40 in the lighting fixture 1 of this embodiment is not easy to darken.

[Effect] Next, the effect of the lighting fixture 1 in this embodiment will be described.

As described above, the lighting fixture 1 of this embodiment includes: a plurality of light emitting modules 20 with a plurality of LED light sources 22; a lens cover 30 covering the plurality of light emitting modules 20; and a translucent diffuser 40 covering the lens Shield 30. In addition, the lens cover 30 has: a plurality of lenses 3 for controlling the light distribution of the light emitted from the plurality of LED light sources 22; and a light guide 33 corresponding to the two adjacent light emitting modules of the plurality of light emitting modules 20 The boundary part K of group 20. On the other hand, the light guide portion 33 includes a light extraction portion 33 b that extracts a part of the light rays incident on the lens cover 30.

In this way, even if the LED light source 22 is not arranged at the boundary portion K of the two adjacent light-emitting modules 20, light can be emitted from the light guide portion 33 of the lens cover 30 arranged at a position corresponding to the boundary portion K . Therefore, this lighting fixture 1 can suppress defects such as dark appearance of the portion of the diffuser 40 corresponding to the light guide portion 33.

Therefore, this lighting fixture 1 can emit light with suppressed brightness unevenness.

In addition, in the lighting fixture 1 of this embodiment, the light extraction portion 33b is formed as a plurality of concave and convex grooves.

In this way, the light extraction portion 33b can more reliably extract the light rays guided by the light guide portion 33.

In addition, in the lighting fixture 1 of this embodiment, the lens cover 30 has a ring shape. The longitudinal direction of the plural grooves crosses the circumferential direction of the lens cover 30.

For example, if the lens cover 30 has a ring shape, when a part of the light incident on the incident surface 131 of the lens 3 is guided to the light guide 33, it becomes easy to face the circumferential direction. Therefore, if the longitudinal direction of the plurality of grooves is formed along the circumferential direction, the light guided by the light guide 33 is directly guided, and it is difficult to emit the light from the second surface 33a2 of the light guide 33.

However, in the present embodiment, the longitudinal direction of the plurality of grooves intersects the circumferential direction, so the light guided by the light guide portion 33 easily enters the light extraction portion 33b. Therefore, the light guide 33 can emit light toward the diffuser 40.

In addition, in the lighting fixture 1 of the present embodiment, the lens cover 30 is provided with plural lens regions E, and one or more lenses 3 among the plural lenses 3 are arranged in a group and dispersed in plural places. The light guide 33 is arranged between two adjacent lens regions E in the plurality of lens regions E.

In this way, the light guide 33 is provided between the two adjacent lens regions E. Therefore, even if the LED light source 22 is not provided at a position opposite to the light guide 33, it is guided to enter the lens region E. Part of the light of the lens 3. Therefore, this lighting fixture 1 can further suppress defects such as dark appearance of the portion of the diffuser 40 facing the light guide portion 33. This lighting fixture 1 can emit light with suppressed uneven brightness more reliably.

In addition, in the lighting fixture 1 of the present embodiment, the lens cover 30 is provided with plural lens regions E, and one or more lenses 3 among the plural lenses 3 are arranged in a group and dispersed in plural places. The plurality of grooves constituting the light extraction portion 33b are formed such that the longitudinal direction of the plurality of grooves is along the boundary line H between the lens area E and the light guide portion 33.

Generally, light rays are emitted radially from the lens 3, so by forming a plurality of grooves along the boundary line H between the lens area E and the light guide portion 33, the light rays are easily incident on the light extraction portion 33b. Therefore, the light extraction efficiency of the light extraction portion 33b is further improved.

In addition, in the lighting fixture 1 of the present embodiment, the light guide portion 33 has a thick portion 34a, and the thickness from the first surface 33a1 on the side of the plural light emitting modules 20 to the second surface 33a2 on the side of the diffuser 40 is partially increased. thick.

In this way, the amount of light emitted from the thick portion 34a is greater than the light guide portion 33 other than the thick portion 34a (thin portion 34b). This is because when the light rays travel the same distance, the number of times that the thin-walled portion 34b is reflected by the first surface 33a1 and the second surface 33a2 increases compared to the thick-walled portion 34a. Therefore, the inventor believes that the light is emitted from the first surface 33a1. The probability of increase. Therefore, the amount of light emitted from the light guide 33 can be increased. Therefore, this lighting fixture 1 can emit light with suppressed unevenness of brightness more reliably.

In addition, in the lighting fixture 1 of this embodiment, the shape of the cross section of the light extraction part 33b is a triangular wave shape.

In this way, the light extraction portion 33b can be easily formed, and the light extraction portion 33b can allow the light guided by the light guide portion 33 to be more reliably emitted from the second surface 33a2.

In addition, in the lighting fixture 1 of the present embodiment, the light distribution peaks of the light rays emitted from one or more lenses 3 arranged on the light guide 33 side face the light guide 33 side.

In this way, light can be incident to the diffuser 40 facing the light guide 33. Therefore, this lighting fixture 1 can emit light with suppressed unevenness of brightness more reliably.

In addition, in the lighting fixture 1 of this embodiment, the lens cover 30 is formed with an opening 30a. On the other hand, the lens cover 30 has an extension portion 30c extending so as to narrow the opening 30a.

For example, depending on the type of lighting equipment, a cable or the like for supplying power to the lighting equipment may be arranged near the opening. In this case, if the cable is large and hangs down, it may protrude from the opening and may become a shadow when viewing the lighting equipment. That is, the cables may be visually recognized through the diffuser cover 40, and the aesthetics of the lighting equipment may be damaged.

However, according to the present embodiment, even if the cables hang down due to the arrangement of these cables and the like near the opening 30a, the extension portion 30c can still support the cables because the extension portion 30c contacts the hanging cable. That is, the extension portion 30c can prevent the cable from contacting or approaching the diffusion cover 40. Therefore, it is possible to suppress defects such as cables from being visually recognized. As a result, this lighting fixture 1 is less likely to deteriorate in appearance.

(Other modifications) As mentioned above, although the lighting fixture of this invention was demonstrated based on embodiment, this invention is not limited to each said embodiment.

For example, in the lighting equipment of each of the above-mentioned embodiments, a flange portion may be formed in the lens cover. That is, it is also possible to form a flange part that extends further in the radial direction from the outermost lens row of the lens cover among the plurality of lenses.

In addition, in the lighting fixture of each of the above-mentioned embodiments, the light extraction part may not be formed in the light guide part. The light extraction part may also be arranged in a part other than the light guide part.

In addition, in the lighting fixtures of the above embodiments, the diameters of the respective lens rows of the lens cover may be slightly the same; the diameter of the outermost lens rows of the lens cover may also be larger than the diameters of other lens rows.

In addition, the above-mentioned respective embodiments can be obtained by implementing various modifications that those having ordinary knowledge in the technical field think of, and the constituent elements and functions of the respective embodiments are arbitrarily combined without departing from the scope of the present invention. The implementation forms are all included in the present invention.

1: lighting appliances 3, 31, 32: lens 10: Chassis 10a: opening 11: bottom 20: Light-emitting module 21: substrate 22: LED (Light Emitting Diode, light-emitting diode) light source 30: lens cover 30a: opening 30c: Extension 31a: Lens assembly part 33: Light guide 33a1: side 1 33a2: Side 2 33b: Light extraction part 34a: Thick-walled part 34b: Thin section 35: Connection part cover 39a: Connection part 39b: Non-connected part 40: diffuser 131: incident surface 132: exit surface 141: The first recess 142: The second recess 142a: Opposite incident surface 142b: Inclined surface 142c: 2nd connection part 142d: 1st connection part E: lens area H: boundary line H1, H2: thickness K: boundary part

Fig. 1 is a perspective view showing the overall configuration of the lighting fixture of the embodiment. Fig. 2 is an exploded perspective view of the lighting fixture of the embodiment. Fig. 3 is a cross-sectional view showing a cross-section of the lighting fixture of the embodiment along the line III-III in Fig. 1. Fig. 4 is a plan view showing the lens cover and the light emitting module of the luminaire of the embodiment. Fig. 5 is a cross-sectional view showing a cross-section of the lens cover of the lighting fixture of the embodiment along the line VV in Fig. 4. Fig. 6 is a cross-sectional view showing a cross-section of the lens cover of the lighting fixture of the embodiment along the VI-VI line in Fig. 4. Fig. 7 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light emitted from the lens of the lens cover of the luminaire of the embodiment. 8 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light emitted from the lens arranged on the light guide portion side of the lighting fixture of the embodiment along the line VIII-VIII in FIG. 4. Fig. 9 is a partial enlarged view showing the lens cover of the lighting fixture of the embodiment. 10 is a cross-sectional view showing a cross-section of the light guide portion of the lens cover of the lighting fixture of the embodiment of the XX line in FIG. 9.

30: lens cover

30a: opening

31, 32: lens

31a: Lens assembly part

33: Light guide

33a1: side 1

33a2: Side 2

33b: Light extraction part

34a: Thick-walled part

34b: Thin section

35: Connection part cover

E: lens area

H: boundary line

Claims (9)

A lighting fixture, including: Multiple light-emitting modules, with multiple light sources; A lens cover covering the plurality of light emitting modules; and Translucent diffuser cover, covering the lens cover; The lens cover has: a plurality of lenses to control the light distribution of the light emitted from the plurality of light sources; and a light guide portion corresponding to the boundary portion of the two adjacent light-emitting modules among the plurality of light-emitting modules; The light guide portion has a light extraction portion that extracts a part of the light incident to the lens cover. Such as the lighting appliance in item 1 of the request, in which, The light extraction portion is formed with a plurality of grooves having uneven shapes. Such as the lighting fixture in item 2 of the request, in which, The lens cover is ring-shaped; The length direction of the plurality of grooves crosses the circumferential direction of the lens cover. Such as the lighting appliance of any one of items 1 to 3 of the claim, in which: The lens cover has a plurality of lens areas, and the plurality of lens areas are dispersed in a plurality of places in a state where one or more lenses of the plurality of lenses are assembled; The light guide portion is arranged between two adjacent lens areas among the plurality of lens areas. Such as the lighting appliance in item 3 of the request, in which, The lens cover has a plurality of lens areas, and the plurality of lens areas are dispersed in a plurality of places in a state where one or more lenses of the plurality of lenses are assembled; The plurality of grooves constituting the light extraction part are formed such that the length direction of the plurality of grooves is along the boundary line between the lens area and the light guide part. Such as the lighting appliance of any one of items 1 to 3 of the claim, in which: The light guide portion has a thick portion, and the thickness of the thick portion is partially thickened from the surface on the side of the plurality of light emitting modules to the surface on the side of the diffuser cover. Such as the lighting appliance of any one of items 1 to 3 of the claim, in which: The cross-sectional shape of the light extraction part is a triangular wave shape. Such as the lighting appliance of any one of items 1 to 3 of the claim, in which: The light distribution peaks of the light rays emitted from the one or more lenses arranged on the side of the light guide are directed toward the side of the light guide. Such as the lighting appliance of any one of items 1 to 3 of the claim, in which: The lens cover is formed with an opening and has an extension part that extends so as to narrow the opening.

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