WO2012098631A1

WO2012098631A1 - Led light-emitting device

Info

Publication number: WO2012098631A1
Application number: PCT/JP2011/050657
Authority: WO
Inventors: 孝二沖; 政富前畑
Original assignee: 早水電機工業株式会社; 不二ライトメタル株式会社
Priority date: 2011-01-17
Filing date: 2011-01-17
Publication date: 2012-07-26
Also published as: JPWO2012098631A1

Abstract

An LED light-emitting device (30) includes a rectangular holding plate (31) for holding a rectangular light-guiding plate (33) having an incidence surface on which light is incident, and LEDs (10) provided at positions facing the incidence surface of the light-guiding plate (33). Since the LEDs (10) are integrated with a heat sink (32) provided to be attachable to and detachable from the holding plate (31), the LEDs (10), together with the heat sink (32), can be easily detached from the holding plate.

Description

LED light emitting device

The present invention relates to an LED light emitting device, and more particularly to an LED light emitting device easy to maintain.

Conventionally, LED light emitting devices are used. In such an LED light emitting device, a light guide plate using a heat sink is disclosed, for example, in Patent Document 1 in consideration of heat generation of the light guide plate. FIG. 6 is a cross-sectional view showing the main parts of the LED light emitting device disclosed in Patent Document 1. As shown in FIG. Referring to FIG. 6, the LED light emitting device includes an LED package 110, a heat sink 130 adhesively connected to a back surface of the LED package 110, a light guide plate 140 provided in front of the LED package 110, and the LED package 110. , A heat sink 130 and a case 120 for holding the light guide plate 140 integrally. The LED package 110 includes a substrate 110 b, an LED 110 a provided on the substrate 110 b, and a translucent sealing portion 110 c covering the LED 110 a.

The case 120 is a longitudinal member having a rectangular cross section, and includes a connecting member 120c connecting the upper member 120a, the lower member 120b, and the upper and lower members 120a and 120b on the heat sink 130 side, and the connecting member 120c is opened at a predetermined position. A portion is provided, and the protrusion 130 a of the heat sink 130 is fitted into this opening. On the other hand, the protrusion 130 a of the heat sink 130 and the substrate 110 b of the LED package 110 are integrated by an adhesive. Further, on the LED side of the LED package 110, the light guide plate 140 is held by being held between the upper and lower members 120a and 120b via a predetermined space.

JP, 2009-110811, A

A light emitting device using an LED having a conventional heat sink is configured as described above. Since the light guide plate 140, the LED package 110 and the heat sink 130 are integrally held by the case 120, when the LED fails and the LED package is replaced, the case 120, the light guide plate 140, the LED package 110 and the heat sink 130 are separated. There is a need to. However, since the LED package 110 and the heat sink 130 are integrated by an adhesive and the connecting member 120 c is provided with the rib 121 for providing the opening 130 a, it is necessary to remove the respective components from the case 120. It is difficult, and there is a problem that the processing at the time of failure of the LED is difficult.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an LED light-emitting device that can be easily maintained, such as processing when an LED fails.

The LED light emitting device according to the present invention includes a rectangular holding plate for holding a rectangular light guide plate having a light incident surface, and an LED provided at a position facing the light incident surface of the light guide plate. The LED is integrated with a heat sink detachably mounted on the holding plate.

Preferably, the heat sink is made of aluminum.

More preferably, the holding plate is an aluminum plate.

The LED light emitting device may be available as a luminaire or may be available as a guide plate.

The heat sink preferably has a surface facing the light guide plate, and preferably has a ridge on the side facing the light guide plate.

In addition, the guide plate may be provided on the roof or may be suspended.

Since the LED is integrated with the heat sink provided detachably on the holding plate, when the LED fails, the heat sink can be easily removed from the holding plate.

As a result, it is possible to provide an LED light emitting device that is easy to maintain.

It is a figure which shows cree type LED. In FIG. 1A, it is an arrow view of the part shown by arrow IB-IB. It is a figure which shows LED of MCM type. In FIG. 2A, it is an arrow view of the part shown by arrow IIB-IIB. It is a perspective view which shows the LED light-emitting device using a Cree type LED. FIG. 3B is a view on arrow in a portion indicated by arrows IIIB-IIIB in FIG. 3A. It is a perspective view which shows the LED light-emitting device using MCM type LED. In FIG. 4A, it is an arrow view of the part shown by arrow IVB-IVB. It is a figure which shows the principal part of the LED light-emitting device which has a holding plate of a different shape. It is a figure which shows the principal part of the LED light-emitting device which has a holding plate of a different shape. It is sectional drawing which shows the principal part of the conventional LED light-emitting device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1A to 2B show the types of LEDs used in this embodiment. FIG. 1A is a plan view of a Cree type LED, and FIG. 1B is a view of a portion indicated by an arrow IB-IB in FIG. 1A. As shown in FIGS. 1A and 1B, the cleat type LED 10 includes a rectangular thin plate-like substrate 11 and a cube-like light emitting portion 12 provided on the substrate 11. The light-emitting unit 12 is provided substantially at the center of the substrate 11 in the creep-type LED 10.

FIG. 2A is a plan view of an MCM type LED, and FIG. 2B is an arrow view of a portion indicated by arrows IIB-IIB in FIG. 2A. As shown in FIGS. 2A and 2B, the MCM type LED 20 includes a rectangular thin plate-like substrate 21 and a rectangular parallelepiped light emitting unit 22 provided on the substrate 21. The MCM type LED 20 is provided on one side of the substrate 21 and provided with a light emitting unit 22 in which a plurality of light emitting parts are integrated, and for fixing the LED 20 in a place where the light emitting unit 22 is not provided. Screw holes 23 are provided.

Next, a light emitting device in which the

LEDs

10 and 20 are incorporated will be described. FIG. 3A is a perspective view showing an LED light emitting device 30 incorporating the Cree type LED 10, and FIG. 3B is a cross-sectional view of a portion shown by arrows IIIB-IIIB in FIG. 3A. The LED light emitting device 30 incorporating the Cree type LED 10 is generally used as a guide plate or the like because the illuminance is low.

Referring to FIGS. 3A and 3B, the LED light emitting device 30 is a light guide plate made of aluminum having a U-shaped cross section, having a flat portion 31a and

ribs

31b and 31c provided on both ends of the flat portion 31a in one direction. It includes a case 31 and solid rectangular

parallelepiped heat sinks

32a and 32b provided along the

ribs

31b and 31c of the light guide plate case 31 made of aluminum. On the opposite side of the

ribs

31b and 31c of the

heat sinks

32a and 32b, a plurality of creep type LEDs 10 are attached in a line at predetermined intervals. The attachment of the Cree type LED 10 to the

heat sinks

32a and 32b is performed by double-sided tape or an adhesive. That is, the LED 10 is fixed to the

heat sinks

32a and 32b. Moreover, the wiring which is not shown in figure is provided in the surface by the side of LED10 of

heat sink

32a, 32b.

Between the heat sinks 32 a and 32 b to which the plurality of LEDs 10 are attached, a rectangular parallelepiped light guide plate 33 having an incident surface facing the LEDs 10 is provided. The light guide plate 33 is fixed to a light guide plate case 31 made of aluminum with an adhesive or the like.

Next, a method of attaching the

heat sinks

32a and 32b to the light guide plate case 31 made of aluminum will be described. Referring to FIG. 3A, screw

holes

34a and 34b are provided outside the

ribs

31b and 31c of the light guide plate case 31 made of aluminum. Further, screw holes not shown are also provided at positions corresponding to the screw holes 34a and 34b of the

heat sinks

32a and 32b. By inserting a screw (not shown) into the

screw holes

34a, 34b, the

heat sinks

32a, 32b can be detachably attached to the light guide plate case 31 made of aluminum. On the other hand, since the LEDs 10 are attached to the

heat sinks

32a and 32b, the plurality of LEDs 10 can be replaced at once by removing the

heat sinks

32a and 32b from the aluminum light guide plate case 31.

Here, the

heat sinks

32a and 32b will be described. The

heat sinks

32a and 32b are aluminum having a rectangular cross section and have high heat conductivity, so they have good heat dissipation. Further, since the

heat sinks

32a and 32b are integrated with the flat portion 31a and the

ribs

31b and 31c, it is possible to dissipate heat from the entire thin and light aluminum light guide plate case 31.

Further, since the

heat sinks

32a and 32b can be detachably attached to the light guide plate case 31 made of aluminum by inserting screws (not shown) into the screw holes 34a and 34b, maintenance becomes easy.

When the dimensions of one side of the

heat sinks

32a and 32b facing the flat portion 31a are a, the dimension of the side orthogonal to it is b, and the thickness of the light guide plate 33 is c, an example of the dimensions is a = 5 mm, b = 8 mm, c = 5 mm. Preferably, this ratio is maintained as an LED light emitting device.

Next, a light emitting device incorporating an MCM type LED will be described. FIG. 4A is a perspective view showing a light emitting device 40 incorporating the MCM type LED 20, and FIG. 4B is a cross-sectional view of a portion indicated by arrows IVB-IVB in FIG. 4A. Here, FIG. 4B is inverted with respect to FIG. 4A.

The light emitting device incorporating the MCM type LED 20 shown in FIGS. 4A and 4B is used as a lighting device because of high illuminance.

Referring to FIGS. 4A and 4B, the LED light emitting device 40 is provided so as to be sandwiched between the flat portion 41a and a pair of

heat sinks

42a and 42b and

heat sinks

42a and 42b provided on both ends of the flat portion 41a in one direction. The light guide plate 43 has a rectangular parallelepiped shape. The

heat sinks

42a and 42b have a rectangular cross section with the

ridges

44a and 44b on the side opposite to the light guide plate case 41 made of aluminum and on the light guide plate 43 side.

On the side of the

heat sinks

42a and 42b opposite to the light guide plate 43, a plurality of MCM type LEDs 20 are aligned and attached in a row. The attachment of the MCM type LED 20 to the

heat sinks

42a and 42b may be performed using screw holes as described above, or may be performed using a double-sided tape or an adhesive. That is, the LED 20 is fixed to the

heat sinks

42a and 42b.

As described above, the light guide plate 43 is provided between the heat sinks 42 a and 42 b to which the plurality of LEDs 20 are attached so as to face the LEDs 10. The light guide plate 43 is fixed to a light guide plate case 41 made of aluminum with an adhesive or the like.

Next, a method of attaching the

heat sinks

42a and 42b to the light guide plate case 41 made of aluminum will be described. Screw holes 45a and 45b are provided on the aluminum light guide plate case 41 side (back side) of the heat sink 42a, and the screws 46a and 46b are inserted into the screw holes 45a and 45b to guide the heat sink 42a to aluminum. Attach to the light plate case 41. The heat sink 42b is also attached to the light guide plate case 41 made of aluminum.

With this configuration, the heat sinks 42 a and 42 b can be detachably attached to the aluminum light guide plate case 41. On the other hand, since the LEDs 20 are attached to the

heat sinks

42a and 42b, the plurality of LEDs 20 can be replaced at once by removing the

heat sinks

42a and 42b from the aluminum light guide plate case 41.

Here, the

heat sinks

42a and 42b will be described. As described above, the

heat sinks

42a and 42b are aluminum having a rectangular cross section having the

ridges

44a and 44b, and the surface area is increased to enhance the heat dissipation. In addition, it is possible to prevent the leakage of the light from the light source from the light source, such as the blindness of the LED that is the light source.

Here, although the case where a pair of heat sinks is provided on one side of one aluminum light guide plate case 41 has been described, the present invention is not limited to this, and both end faces of one aluminum light guide plate case 41 are provided. A heat sink may be provided, or heat sinks may be provided on both sides of the light guide plate case 41.

Further, in FIG. 4A, a plate made of translucent plastic or the like may be attached between the ridges 44 of the heat sink.

In the same manner as in FIGS. 3A and 3B, a plate made of a translucent plastic or the like may be mounted on the light guide plate 33 to form a guide plate.

Next, another embodiment of the present invention will be described. Although the said embodiment demonstrated the case where a ridge was not provided in the light-guide plate case made from aluminum of a cross-sectional U-shape, and a light-guide plate case made from aluminum which has only a plane part is provided, it does not restrict to this. These may be reversed. This case is shown in FIGS. 5A and 5B. FIG. 5A is a view showing a case where a ridge is not provided in an aluminum light guide plate case having only a flat portion, and FIG. 5B is a view showing a case where a ridge is provided in an aluminum light guide plate case having a U-shaped cross section. is there. The corresponding reference numerals in the previous embodiment are attached to the respective drawings, and the description thereof is omitted.

In the above embodiment, each LED may be replaced.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same or equivalent scope of the present invention.

Since the LED light emitting device according to the present invention is easy to maintain, it is advantageously used as an LED light emitting device.

10, 20 LEDs, 11, 21 substrates, 12 light emitting portions, 22 light emitting units, 23 screw holes, 30, 40 light emitting devices, 41a flat portions, 42a, 42b heat sinks, 43 light guide plates, 44a, 44b.

Claims

A rectangular holding plate for holding a rectangular light guide plate having a light incident surface;
And an LED provided at a position facing the incident surface of the light guide plate,
The LED light-emitting device, wherein the LED is integrated with a heat sink that is provided detachably on the holding plate.
The LED light emitting device according to claim 1, wherein the heat sink is made of aluminum.
The LED light emitting device according to claim 1, wherein the holding plate is an aluminum plate.
The LED light-emitting device according to claim 1, wherein the LED light-emitting device is usable as a luminaire.
The LED light emitting device according to claim 1, wherein the LED light emitting device is usable as a guide plate.
The LED light emitting device according to claim 1, wherein the heat sink has a surface facing the light guide plate, and has a ridge on the side facing the light guide plate.
The LED light emitting device according to claim 5, wherein the guide plate is provided on a rooftop.
The LED light emitting device according to claim 5, wherein the guide plate is a hanging guide plate.