JP2012079617A - Linear led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear LED lighting device to be a substitute of a cold-cathode tube, by fully diffusing emission of LEDs as point light sources.SOLUTION: The device is provided with a triangle-pole shape light transmission diffusion part 1a having an emission face 1e, a first reflecting face 1f, and a second reflecting face 1g formed with light-scattering particles uniformly dispersed in three dimensions in transparent resin, and a first reflecting part 1i as well as a second reflecting part 1j pasted on the first reflecting face 1f as well as the second reflecting face 1g, respectively. A plurality of communicating windows 1c communicating with the second reflecting face 1g are formed at the second reflecting part 1j along a length direction of the light transmission diffusion part 1a, and ruggedness treatment parts 1d are formed at the second reflecting face 1g at a position where the communicating windows 1c are formed, each communicating window 1c having an LED 3 insertion-fitted.

Description

  The present invention relates to a linear LED illumination device used for a backlight or the like.

  Conventionally, the decorative plate covering the front surface of the spinning cylinder type game machine is made of a decorated resin plate such as translucent acrylic, except for the transparent spinning window. A backlight is disposed on the back side of the decorative board so that the entire decorative decorative board can be seen to emit light. As the backlight, generally 3 to 4 linear cold cathode tubes are used. In recent years, in response to a request for reducing greenhouse gas emissions, a lighting device has been proposed in which a plurality of LEDs are arranged in a row as shown in Patent Document 1 to reduce power consumption. The LED is substantially a point light source because the area of the light emitting portion is small. For this reason, when the illuminating device using such an LED is used as a backlight, there is a problem that the decorative board at the position where the LED is disposed appears to emit light strongly and looks bad. Therefore, as shown in Patent Document 2, a linear illumination device has been proposed in which LEDs are attached to both ends of a longitudinal transparent bar coated with white ink except for one side surface and both end reflection surfaces. In such an illumination device, it is possible to eliminate illuminance unevenness.

JP 2009-43686 A JP 2002-232648 A

However, in the lighting device shown in Patent Document 2, since LEDs are attached only to both ends of the transparent bar, there is a problem that the illuminance is insufficient when used as a backlight. On the other hand, in the case of using a high-brightness LED, if the lighting device is used as a backlight, the lighting device is used in a sealed space, so cooling due to heat generation becomes difficult, and the LED is burned out, Or the problem that LED becomes short life will generate | occur | produce.
An object of the present invention is to solve the above-mentioned problems and to provide a linear LED illumination device that can sufficiently diffuse the light emitted from an LED, which is a point light source, to replace a cold cathode tube.

The invention according to claim 1, which has been made to solve the above problems,
A triangular prism-shaped light transmission diffusion portion formed with an emission surface, a first reflection surface, and a second reflection surface;
The first reflection surface and the second reflection surface of the light transmission diffusion portion, respectively, having a first reflection portion and a second reflection portion that are attached or formed, respectively.
A plurality of communication windows communicating with the second reflection surface are formed in the second reflection portion along the longitudinal direction of the light transmission diffusion portion,
On the second reflecting surface at the position where the communication window is formed, an unevenness processing part is formed,
An LED is attached to a position facing each of the uneven processing portions.

The invention according to claim 2 is the invention according to claim 1,
The LED is mounted by being inserted into the communication window.
Thereby, illumination light does not leak and it becomes possible to prevent deterioration of appearance. In addition, the illumination light emitted from the LED is reflected by the peripheral surface of the communication window and is incident on the unevenness processing section without waste, thereby preventing a decrease in the amount of light.

The invention according to claim 3 is the invention according to claim 1 or 2,
The cross-sectional shape of the light transmission diffusion part is an isosceles triangle having the first reflection surface as a long side.
As a result, the illumination light emitted from the LED is reflected in the direction of the exit surface by the first reflecting surface, and the illumination light is efficiently incident on the exit surface side, so that the attenuation of the illumination light is suppressed and the light quantity is reduced. It becomes possible to prevent.

  According to the present invention, a triangular prism-shaped light transmission diffusion portion having an emission surface, a first reflection surface, and a second reflection surface formed on the outer peripheral surface, and the first reflection surface and the second reflection surface of the light transmission diffusion portion. The reflection surface has a first reflection portion and a second reflection portion that are respectively pasted or formed, and the second reflection portion includes a communication window that communicates with the second reflection surface. A plurality of concave and convex portions are formed on the second reflection surface at positions where the plurality of communication windows are formed along the longitudinal direction, and LEDs are attached at positions facing the respective concave and convex portions. Thereby, the illumination light radiated from the LED is irregularly refracted by the unevenness processing part, is transmitted through the light transmission diffusion part while being diffused, is reflected by the first reflection surface and the second reflection surface, and is emitted from the emission surface. It is emitted as diffused light. For this reason, it has become possible to provide a linear LED illuminating device that sufficiently diffuses the light emitted from the LED, which is a point light source, eliminates unevenness in illuminance, and can replace the cold cathode tube.

It is a front view of the linear LED illuminating device which shows embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. 1 in another embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a linear LED lighting device 10 according to the present invention includes a light diffusing unit 1, a substrate 2, and LEDs (Light Emitting Diodes) 3. The light diffusing unit 1 has a square bar shape. The light diffusing unit 1 includes a light transmission diffusing unit 1a having a triangular prism shape and a light reflecting unit 1b. As shown in FIG. 2, the cross-sectional shape of the light transmission diffusion portion 1a is a right triangle. In this embodiment, the cross-sectional shape of the light transmission diffusion part 1a is a right-angled isosceles triangle shape.

  In this embodiment, the light diffusing portion 1a uniformly distributes light scattering particles having a refractive index different from that of the base resin in a transparent base resin such as polystyrene, polycarbonate, polymethylmethyl methacrylate, and acrylic. It has been made. The light scattering particles include silicon resin, methacrylic resin, and polystyrene resin. In addition, inorganic materials such as silica, calcium carbonate, and titanium oxide may be used as the light scattering particles. The illumination light incident on the light transmissive diffusing portion 1a is scattered by the light scattering particles and diffused and emitted when passing through the light transmissive diffusing portion 1a.

  In the present embodiment, the light reflecting portion 1b is a white resin excellent in light reflectivity in which a transparent resin such as polycarbonate or acrylic is filled with a white pigment such as a titanium dioxide pigment. In this embodiment, since the light reflection part 1b is comprised by filling a polycardinate with titanium dioxide, it has a high light reflectivity of 96% or more in the entire visible region.

  As shown in FIG. 2, in the cross section of the light transmission diffusion part 1a having a right triangle shape, the long side is the first reflecting surface 1f, one short side is the exit surface 1e, and the other short side is the second reflecting surface 1g. It has become. In other words, the angle formed by the emission surface 1e and the second reflection surface 1g is a right angle. Both ends in the longitudinal direction of the light transmission diffusion portion 1a are both end reflection surfaces 1h. Except for the emission surface 1e of the light transmission diffusion portion 1a, the first reflection surface 1f, the second reflection surface 1g, and the both end reflection surfaces 1h of the light transmission diffusion portion 1a are covered with the light reflection portion 1b. More specifically, the first reflecting surface 1f is pasted with a first reflecting portion 1i having an isosceles right triangle shape, and the second reflecting surface 1g is pasted with a plate-like second reflecting portion 1j. The both-ends reflection surface 1h is provided with a plate-like both-ends reflection part 1k. In the present embodiment, the light transmission diffusion portion 1a and the light reflection portion 1b are formed separately, and the light transmission diffusion portion 1a and the light reflection portion 1b are bonded together to form the light diffusion portion 1. It is easy to assemble and can be manufactured at low cost.

  As shown in FIG. 2 and FIG. 3, a plurality of communication windows 1 c communicating with the second reflecting surface 1 g are formed in the second reflecting portion 1 j along the longitudinal direction of the light diffusing portion 1. As shown in FIG. 2 and FIG. 3, an unevenness processing portion 1 d that is processed to be uneven is formed on the second reflecting surface 1 g at the bottom of the communication window 1 c. In the embodiment shown in the figure, the unevenness processing portion 1d is formed with a plurality of adjacent grooves having a triangular cross-sectional shape. The shape of the concavo-convex treatment portion 1d is not limited to this, and may be concavo-convex processing such as so-called embossing or diamond cutting.

  As shown in FIG. 1 and FIG. 2, the substrate 2 is attached to the outer peripheral surface of the second reflecting portion 1j. A plurality of LEDs 3 are affixed to one surface of the substrate 2, and wiring (not shown) that supplies current to the LEDs 3 is formed. In the present embodiment, the LED 3 is a full-color LED that independently emits red, green, and blue light. Note that when the LED 3 emits red, green, and blue light, it looks white. As described above, when a full color LED is used for the LED 3, it is possible to provide a rich backlight. Note that a white LED may be used as the LED 3. As FIG. 2 shows, each LED3 is attached in the state inserted in the communicating window 1c. In this state, the light emitting surface of each LED 3 faces each uneven processing portion 1d. As shown in FIG. 1 and FIG. 2, since a plurality of LEDs 3 are attached to one surface of the substrate 2 to form wiring, there is no structure on the other surface side of the substrate 2. It becomes possible to provide a heat dissipation structure such as a heat sink on the other side. When the heat dissipation structure is provided on the other surface side of the substrate 2, the life of the LED 3 can be extended.

  Next, the effect | action of this invention at the time of making LED3 light-emit is demonstrated. When each LED 3 emits light, the illumination light enters the unevenness processing portion 1d. The illumination light is irregularly refracted by the unevenness processing unit 1d and is incident on the light transmission diffusion unit 1a in a diffused state. In the present embodiment, each LED 3 is mounted in a state of being inserted into the communication window 1c, so that illumination light does not leak to the substrate 2 side, and deterioration of appearance can be prevented. Further, since the LED 3 is surrounded by the communication window 1c configured by the light reflecting portion 1b, the illumination light is reflected by the peripheral surface of the communication window 1c and is incident on the uneven processing portion 1d without waste, and the light amount is reduced. Is prevented.

The illumination light incident on the light transmission / diffusion unit 1a is transmitted while being further diffused by the light scattering particles uniformly present in the light transmission / diffusion unit 1a. The illuminating light that is transmitted through the light transmissive diffusing portion 1a while being diffused is reflected by the first reflecting portion 1i, the second reflecting portion 1g, and the both-end reflecting portion 1k, and is emitted from the emitting surface 1e. As described above, in the present invention, the illumination light incident on the light transmission diffusion portion 1a is reflected by the first reflection portion 1i, the second reflection portion 1g, and the both-end reflection portions 1k and is emitted from the emission surface 1e. The reduction in the amount of light emitted from the linear LED lighting device 10 is prevented without greatly reducing the amount of illumination light emitted from each LED 3. In the present invention, the light scattering particles are uniformly present in the light transmission diffusion portion 1a, and the illumination light is reflected by the first reflection portion 1i, the second reflection portion 1g, and the both end reflection portions 1k. When the illumination light is reflected by the first reflection part 1i, the second reflection part 1g, and the both end reflection part 1k in a complicated manner and is transmitted through the light transmission diffusion part 1a, the illumination light is diffused by the light scattering particles. Diffused light is emitted from the exit surface 1e to sufficiently diffuse the light emitted from the LED, which is a point light source, to eliminate unevenness in illuminance, and to provide a linear LED lighting device that can replace a cold cathode tube. It was. In the present embodiment, since the cross-sectional shape of the light transmission diffusion portion 1a is an isosceles triangle having the first reflection surface 1f as a long side, the irradiation light emitted from the LED 3 is emitted from the first reflection surface 1f. Since the illumination light is reflected in the direction of the surface 1e and efficiently enters the exit surface 1e side, attenuation of the illumination light is suppressed, and a reduction in the amount of light can be prevented.
In the present invention, the light transmission / diffusion part 1a has a triangular shape, and the illumination light incident on the light transmission / diffusion part 1a is reflected by the first reflection part 1i, the second reflection part 1g, and the both-end reflection part 1k, and the emission surface 1e. Therefore, it is possible to sufficiently diffuse the light emitted from the emission surface 1e as compared with the case where the light transmission diffusion portion 1a has a square shape, and the light transmission diffusion portion 1a is expensive. It becomes possible to save material.

  In the embodiment described above, the first reflecting surface 1f, the second reflecting surface 1j, and the both-end reflecting surfaces 1h of the light transmission diffusion portion 1a are respectively formed of a white resin and the first reflecting portion 1i, the second reflecting surface 1h. The reflection part 1j and the both-ends reflection part 1k are affixed, but a white pigment is applied to the first reflection surface 1f and the second reflection surface 1j, and the first reflection part 1i, the second reflection part 1j, and the both-end reflection part. 1k may be formed. Alternatively, the first reflective portion 1i, the second reflective portion 1j, and the both-end reflective portion 1k having a specular color (silver) may be attached to the first reflective surface 1f, the second reflective surface 1j, and the both-end reflective surface 1h. . Also, the first reflective surface 1f, the second reflective portion 1j, both ends of the mirror surface are vacuum-deposited on the first reflective surface 1f, the second reflective surface 1j, and the both-end reflective surface 1h of the light transmission diffusion portion 1a. The reflection part 1k may be formed. Thus, if the 1st reflection part 1i, the 2nd reflection part 1j, and both-ends reflection part 1k are made into a mirror surface, the reflectance in the said part will be about 100%, and attenuation | damping of the illumination light in the said part is prevented. In the present embodiment, since the light reflecting portion 1b is made of white resin, the illumination light is diffused even in the light reflecting portion 1b, and it is possible to further eliminate unevenness in illuminance.

  As shown in FIG. 5A, a triangular prism space 1m may be formed at a position away from the first reflecting portion 1i of the light reflecting portion 1b. In this embodiment, it is possible to reduce the resin material while securing the shape of the light diffusion portion 1 having a square bar shape, and it is possible to reduce the cost. Further, as shown in FIG. 5B, a light reflecting portion 1b is formed only at a position in contact with the first reflecting surface 1f and the second reflecting surface 1j of the light transmitting and diffusing portion 1a. A triangular prism shape is also acceptable. Also in this embodiment, the resin material can be reduced, and the cost can be reduced.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. However, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and it is understood that the linear LED lighting device with such a change is also included in the technical scope. It must be.

DESCRIPTION OF SYMBOLS 1 Light diffusing part 1a Light transmissive diffusing part 1b Light reflecting part 1c Communication window 1d Concavity and convexity processing part 1e Emission surface 1f First reflecting surface 1g Second reflecting surface 0
1h End surface 1i 1st reflection part 1j 2nd reflection part 1k Both-ends reflection part 2 Board | substrate 3 LED
10 linear LED lighting device

Claims (3)

A triangular prism-shaped light transmission diffusion portion formed with an emission surface, a first reflection surface, and a second reflection surface;
The first reflection surface and the second reflection surface of the light transmission diffusion portion, respectively, having a first reflection portion and a second reflection portion that are attached or formed, respectively.
A plurality of communication windows communicating with the second reflection surface are formed in the second reflection portion along the longitudinal direction of the light transmission diffusion portion,
On the second reflecting surface at the position where the communication window is formed, an unevenness processing part is formed,
LED is attached to the position which opposes each said uneven | corrugated process part, The linear LED illuminating device characterized by the above-mentioned.   The LED lighting device according to claim 1, wherein the LED is inserted into and attached to the communication window.   3. The linear LED device according to claim 1, wherein a cross-sectional shape of the light transmission diffusion portion is an isosceles triangle having a first reflection surface as a long side.

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