JP2005190954A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED To reduce the thickness of an apparatus by enabling irradiation of only a specific range.
An illumination device includes a light source composed of one or a plurality of LEDs 1 having a directivity angle of less than 30 degrees, and a fly-eye lens 3 disposed at a predetermined interval from the light source and made of a translucent material.
[Selection] Figure 1

Description

  The present invention relates to an illuminating device that can irradiate only a specific range without requiring a reflecting instrument or the like.

  Conventionally, as an illuminating device that can irradiate only a specific range, an illumination device that is a combination of a light source and a reflector lens as disclosed in JP-A-2001-229719 is known.

However, the illumination device having the above configuration has a problem that the thickness of the device is increased.
JP 2001-229719 A

  The problem to be solved is that the thickness of the device cannot be reduced in an illumination device that can irradiate only a specific range.

  The illumination device according to the present invention includes a light source composed of one or a plurality of LEDs or light bulbs having a directivity angle of less than 30 degrees; and one or a plurality of fly-eye lenses composed of a translucent material disposed at a predetermined interval from the light source. And characterized by comprising: and.

  The illumination device according to the present invention includes a light source composed of one or a plurality of LEDs or light bulbs; one or a plurality of fly-eye lenses disposed at a predetermined interval from the light source and made of a translucent material; the light source and the fly And a collimation lens made of a translucent material and disposed at a predetermined distance from the eye lens.

  According to the illuminating device of the present invention, one or a plurality of light radiated from a light source composed of one or a plurality of LEDs or light bulbs having a directivity angle of less than 30 degrees is made of a translucent material arranged at a predetermined interval. The fly-eye lens is irradiated to a range determined by the shape of the exit surface of the cell lens in the fly-eye lens, and a predetermined range can be irradiated even though the apparatus is thin.

  According to the illumination device of the present invention, light emitted from a light source including one or a plurality of LEDs or light bulbs is converted into parallel light by a collimation lens and is incident on a fly-eye lens. Irradiation is in a range determined by the shape of the exit surface, and there is an effect that a predetermined range can be irradiated even when the directivity angle of the light source is large and the apparatus is thin.

  The purpose of realizing irradiation in a predetermined range by a device having a small thickness is achieved by using a light source composed of one or a plurality of LEDs or light bulbs having a directivity angle of less than 30 degrees and a fly-eye lens, or 1 or This is realized by using a light source composed of a plurality of LEDs or light bulbs, a fly-eye lens and a collimation lens. DESCRIPTION OF EMBODIMENTS Hereinafter, an illumination device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals and redundant description is omitted.

  FIG. 1 shows a first embodiment of a lighting device according to the present invention. In this illuminating device, a plurality of LEDs (bullet type LEDs) 1 emitting the same color are used as a light source. The plurality of LEDs 1 are arranged in an array on the substrate 2, and the directivity angle of each LED 1 is less than 30 degrees. Here, the directivity angle is an angle (half-value width) at which the intensity of light emitted from the LED 1 is half the peak value.

  A fly-eye lens 3 made of a light-transmitting material such as glass is disposed in front of the LED 1 at a predetermined distance from the LED 1 that is a light source. The fly-eye lens 3 and the LED 1 as the light source are positioned and arranged in an appropriate cylindrical case, for example. Here, the fly-eye lens 3 is a collection of a plurality of cell lenses 4. The cell lens 4 is substantially elliptical when viewed from the side, and is viewed from the exit surface direction as shown in FIG. It is a rectangular shape as shown. In addition to the rectangular shape, the shape of the cell lens 4 viewed from the exit surface direction is a square shape shown in FIG. 2B, a triangular shape shown in FIG. 2C, a circular shape shown in FIG. A polygonal shape such as a hexagonal shape shown in 2 (e) or an octagonal shape (not shown) can be adopted. The vertical and horizontal dimensions or diameter of the cell lens 4 as viewed from the exit surface direction is practically about 0.2 mm to 20 mm.

  As shown in FIG. 3, each cell lens 4 of the fly-eye lens 3 spreads from a point on the exit surface with a certain directivity angle and irradiates a predetermined same region S when parallel light enters the entrance surface. . The shape of the region S viewed from the front direction matches the shape of each cell lens 4 viewed from the exit surface direction. For example, in the case of a rectangular shape as shown in FIG. 2A, the region S is also a rectangular region, and in the case of the square shape shown in FIG. 2B, the region S is also a square region.

  In the fly-eye lens 3 having the cell lens 4 having a triangular emission surface with the apex angle on the upper side and a triangular emission surface with the apex angle on the lower side as shown in FIG. The shape of the region S is formed in a hexagonal star shape with overlapping. The irradiation areas of the cell lenses 4 do not overlap at all, but in the irradiation area S, non-overlapping areas are generated on the left, right, top and bottom by the cell pitch. That is, a vertically and horizontally long non-overlapping region as viewed from the exit surface direction of the cell lens 4 only occurs in the irradiation region S, and many of the irradiation regions of each cell lens 4 are completely overlapped.

  In the above description, the radius of curvature of the fly-eye lens 3 is practically about 1 mm to 10 mm. Further, the distance between the fly-eye lens 3 and the LED 1 is appropriately selected within a proximity or adjacent distance, that is, in a range of about 0 mm to 10 mm. In this LED 1, since the directivity angle of the LED 1 is less than 30 degrees, the light incident on one cell lens 4 may leak into the adjacent cell lens 4 through the cell lens 4 at the above-mentioned distance. In the same manner as when parallel light is incident, the non-overlapping region in the irradiation region S can be prevented from expanding. Thus, only the irradiation region S having a desired shape can be appropriately irradiated by the thin, small and light illumination device. The size of the irradiation region S can be changed by changing the distance between the fly-eye lens 3 and the LED 1.

  FIG. 4 shows a modification of the lighting device according to the first embodiment. In this illumination device, two fly-eye lenses 3A and 3A are arranged side by side. The distance between the fly-eye lens 3 </ b> A facing the LED 1 and the LED 1 is appropriately selected within a proximity or adjacent distance, that is, in a range of about 0 mm to 10 mm. The distance between the two fly-eye lenses 3A and 3A is such that the non-overlapping area in the irradiation area S does not become large, as shown in the optical path of FIG. It selects suitably so that it may inject. With the above configuration, it is possible to provide a lighting device having a necessary irradiation area by selecting various intervals between the members. In this example, two fly-eye lenses are used, but three or more fly-eye lenses may be used.

  Moreover, although the said smell provided two or more LED1, it may be one. It is also possible to use one or a plurality of light bulbs having a directivity angle of less than 30 degrees instead of the LEDs.

  FIG. 5 shows an illumination apparatus according to the second embodiment. In this illumination device, a plurality of LEDs (surface mounted LEDs) 5 that emit light of the same color are used as a light source. The plurality of LEDs 5 are surface-mounted on the substrate 2 in an array, and the directivity angle of each LED 5 may be 30 degrees or more. Here, the directivity angle is as described above.

  In the illumination apparatus according to the second embodiment, a collimation lens 6 is disposed between the fly-eye lens 3 and the LED 5. The collimation lens 6 converts the light emitted from the LED 5 into parallel light. Even when the directivity angle of the LED 5 is 30 degrees or more, the light emitted from the LED having the directivity angle of less than 30 degrees is a fly-eye. The light is incident on the lens 3. That is, even when the directivity angle of the LED 5 is 30 degrees or more, the light beam travels after the fly-eye lens 3 in the same manner as the illumination device according to the first embodiment. That is, when the directivity angle of the LED 5 is 30 degrees or more, the structure in which the collimation lens 6 according to the present embodiment is disposed is an essential structure, and when the directivity angle of the LED 5 is less than 30 degrees, A configuration according to one embodiment can be employed.

  The distance between the LED 5 and the collimation lens 6 is appropriately selected within a range of about 0 mm to 10 mm. This distance is a distance necessary to produce substantially parallel light according to the directivity angle of the LED 5. The distance between the collimation lens 6 and the fly-eye lens 3 is appropriately selected within a range of about 0 mm to 10 mm. This distance is such that a light beam incident on one cell lens 4 does not leak into the adjacent cell lens 4 through the cell lens 4, and the non-overlapping region in the irradiation region S is the same as when parallel light is incident. This is the distance that can prevent expansion. The fly-eye lens 3, the LED 5 as a light source, and the collimation lens 6 are positioned and arranged in an appropriate cylindrical case, for example.

  The other structure in the illuminating device according to the second embodiment is the same as that in the illuminating device according to the first embodiment. Even in such a configuration, the required thickness of the light source LED 5, the collimation lens 6, and the fly-eye lens 3 is extremely thinner than that of the conventional illumination device, and a desired shape can be obtained by using a thin and small illumination device. It is possible to appropriately irradiate only the irradiation region S. The size of the irradiation region S can be changed by changing the distance between the LED 5, the collimation lens 6, and the fly-eye lens 3.

  FIG. 6 shows a modification of the illumination device according to the second embodiment. In this illumination device, two fly-eye lenses 3A and 3A are arranged side by side. The distance between the fly-eye lens 3A facing the collimation lens 6 and the collimation lens 6 is appropriately selected within a range of about 0 mm to 10 mm. The distance between the two fly-eye lenses 3A and 3A is from one point on the exit surface of the fly-eye lens 3A in the final stage so that the non-overlapping area in the irradiation area S does not increase so that the optical path is the same as in FIG. It selects suitably so that light may be inject | emitted. With the above configuration, it is possible to provide a lighting device having a necessary irradiation area by selecting various intervals between the members. In this example, two fly-eye lenses are used, but three or more fly-eye lenses may be used.

  In the second embodiment, a plurality of LEDs 5 are provided, but one LED may be provided. It is also possible to use one or a plurality of light bulbs instead of the LEDs. This light bulb may have a directivity angle of 30 degrees or more.

  In the above two embodiments, instead of a plurality of LEDs that emit the same color, by adopting a plurality of LEDs that emit different colors, it can also be used as an illumination device that irradiates the irradiation region S to a desired hue. Applicable.

The figure which shows the structure of the 1st Example in the illuminating device which concerns on this invention. The top view of the output surface in the fly eye lens used for the illuminating device which concerns on this invention. Explanatory drawing which shows the light irradiation from the cell lens of the fly eye lens used for the illuminating device which concerns on this invention. The figure which shows the modification of the 1st Example in the illuminating device which concerns on this invention. The figure which shows the structure of the 2nd Example in the illuminating device which concerns on this invention. The figure which shows the modification of the 2nd Example in the illuminating device which concerns on this invention.

Explanation of symbols

1 LED
2 Substrate
3 Fly eye lens
3A fly eye lens
4 Cell lens
5 LED
6 Collimation lens

Claims (2)

A light source comprising one or more LEDs or light bulbs having a directivity angle of less than 30 degrees;
One or more fly-eye lenses arranged at a predetermined distance from the light source and made of a translucent material;
An illumination device comprising: A light source consisting of one or more LEDs or bulbs;
One or more fly-eye lenses arranged at a predetermined distance from the light source and made of a translucent material;
A collimation lens made of a translucent material and disposed at a predetermined distance between the light source and the fly-eye lens;
An illumination device comprising:

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