JP2006310119A - Housing case for flat light emitting device and flat light emitting device equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing case for flat light emitting device with which a linear light source can be fixed easily without a fixing component and deterioration of brightness of the flat light emitting device. <P>SOLUTION: A light guide plate 2 is put on the housing case 3 for flat light emitting device on which a reflective sheet 11 is stuck and the linear light source 1 is inserted into the housing case 3 with its light emitting face 1a of the linear light source 1 opposed to a side 2a of the light guide plate 2. Corners of a back face 1b of the linear light source 1 are applied to a latching part 4 and the linear light source 1 is deformed to push into a space between a side wall 3a of the housing case 3 and the latching part 4 until the linear light source 1 gets in contact with the reflective sheet 11 tightly. The latching part 4, which gets in contact with the back face 1b of the linear light source 1, presses it to the light guide plate 2. Then since the light emitting face 1a of the linear light source 1 becomes in contact with the side 2a of the light guide plate 2, light from the light source 1 is transmitted to the light guide plate 2 without waste, which prevents deterioration of brightness of the flat light emitting device 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a case for a surface light emitting device that houses a light guide plate and a linear light source device, and more particularly to a case for a surface light emitting device used for a backlight of a liquid crystal display device.

  In a liquid crystal display device used for a display unit such as a cellular phone, a surface light emitting device that emits light from the back surface of a liquid crystal display panel is provided in order to improve visibility in a dark place. As a conventional example of such a surface light emitting device, the one described in Patent Document 1 is known.

  As shown in FIG. 8, in the surface light emitting device of Patent Document 1, a light emitting element 51 serving as a light source, a flexible substrate 52 that transmits an electric signal for causing the light emitting element 51 to emit light, and a liquid crystal display panel are irradiated. Are provided with a light guide plate 54 that transmits light emitted from the light emitting element 51, and a case 53 that houses the light emitting element 51 and the light guide plate 54. The light emitting element 51 is fixed to the flexible substrate 52 with the solder 57, the flexible substrate 52 is accommodated in the case 53, and then the light guide plate 54 is inserted into the case 53. And the light emitting element 51 and the light-guide plate 54 are fixed with the transparent fixing material 55 using the dispenser 58. FIG.

  Since the light emitted from the light emitting element 51 which is the light source of the surface light emitting device of Patent Document 1 diverges in various directions, the amount of light incident on the light guide plate 54 is reduced, and the luminance of the surface light emitting device is sufficient. I can't say that.

Therefore, there is a surface light emitting device using a linear light source device 61 that can efficiently reflect light emitted from a light emitting element as a light source. As shown in FIG. 9, the linear light source device 61 of the surface light emitting device includes a substrate 65 formed in an elongated shape, a plurality of light emitting elements 66 arranged along the longitudinal direction of the substrate 65, and a light emitting element. 66, and a reflector 68 that reflects the light emitted from the light emitting element 66 in the longitudinal direction in the emission direction P, and a resin sealing portion 67 that seals the light emitting element 66. With this linear light source device 61, the light emitted from the light emitting element 66 can be efficiently reflected and emitted from the emission direction P.
JP 2004-273185 A

  In the surface light-emitting device of Patent Document 1, since the gap between the light-emitting element 51 and the light guide plate 54 is reduced by using the fixing material 55, a reduction in luminance can be prevented. However, the use of the fixing material 55 increases the number of work steps of injecting the fixing material 55 after the light emitting element 51 and the light guide plate 54 fixed to the flexible substrate 52 are accommodated in the case 53, and the fixing material 55. If the injection amount is not uniform, the distance between the light emitting element 51 and the light guide plate 54 is not uniform, which may cause uneven brightness in the surface light emitting device.

  On the other hand, when the above-described linear light source device 61 is used as a light source of the surface light emitting device, a line formed between the case and the light guide plate in order to make all the light emitted from the linear light source device 61 incident on the light guide plate. It is desirable to make the space for housing the light source device 61 as narrow as possible so that the light emitting surface 66a of the light emitting element 66 and the incident surface of the light guide plate are in close contact with each other. However, if this space is made too narrow, it becomes difficult to fit the light guide plate and the linear light source device 61 into the case for storage.

  Therefore, in view of the above points, the present invention can easily fix the linear light source device without using a fixing material, and can bring the linear light source device and the light guide plate into close contact with each other. An object of the present invention is to provide a surface light emitting device case capable of preventing a decrease in luminance.

  The surface light emitting device case of the present invention is formed in a box shape opened by a bottom surface and side walls, a linear light source device in which a plurality of light emitting elements are arranged on a long substrate, and light from the light emitting elements. A light guide plate that emits as illumination light is a case for a surface light emitting device that is housed in a state in which a light emitting surface of the linear light source device is opposed to a side surface of the light guide plate, and the light of the linear light source device An engaging portion is formed in contact with the back surface which is the surface opposite to the exit surface, separating the back surface from the side wall and pressing the linear light source device against the light guide plate.

  According to the surface light emitting device case of the present invention, there is a gap between the side wall of the case and the locking piece. Therefore, when the linear light source device is stored in the surface light emitting device case in which the light guide plate is stored. The linear light source device can be easily fixed to the case simply by pushing in the linear light source device using this gap. At this time, the locking piece is in contact with the back surface, which is the surface opposite to the light emitting surface of the linear light source device, and presses the linear light source device against the light guide plate. Can be adhered. Therefore, light from the light emitting element can be transmitted to the light guide plate without waste, and a reduction in luminance of the surface light emitting device can be prevented.

  A surface light emitting device case according to a first invention of the present application is formed in a box shape opened by a bottom surface and a side wall, and a linear light source device in which a plurality of light emitting elements are arranged on a long substrate, and a light emitting element A light guide plate that emits light from the light source as illumination light is a case for a surface light emitting device that is housed in a state in which the light emission surface of the linear light source device faces the side surface of the light guide plate, An engaging portion is formed in contact with the back surface which is the surface opposite to the light emitting surface, separating the back surface from the side wall and pressing the linear light source device against the light guide plate.

  The engaging portion of the case for the surface light emitting device is provided at a position that contacts the back surface that is the surface opposite to the light emitting surface of the linear light source device and that separates the back surface from the side wall of the case. There is a gap between and the locking portion. When the linear light source device is accommodated after the light guide plate is accommodated in the case, the linear light source device is pushed into the gap between the locking portion and the light guide plate by using the gap. Can be fixed to. Therefore, the linear light source device can be easily fixed to the case without using a fixing material or the like. Further, at this time, since the locking portion is in contact with the back surface of the linear light source device and presses the linear light source device against the light guide plate, the light emitting surface of the linear light source device and the side surface of the light guide plate are brought into close contact with each other. Can do. Therefore, light from the light emitting element can be transmitted to the light guide plate without waste, and a reduction in luminance of the surface light emitting device can be prevented.

  In addition, it is more desirable that the engaging portion is formed of an elastically deformable member or a flexible member. Accordingly, when the linear light source device is accommodated, the locking portion slightly deformed to the gap side returns to the original shape due to its elastic action and flexibility when the linear light source device is accommodated. Since the linear light source device can be strongly pressed by the light guide plate, the degree of adhesion between the light emitting surface of the linear light source device and the side surface of the light guide plate can be increased.

  According to a second invention of the present application, in the first invention of the present application, the linear light source device has a wiring pattern on the back surface, and the locking portion is formed when the linear light source device is accommodated. It is characterized by being formed at an intermediate position.

  When the wiring pattern is formed on the back surface of the linear light source device and the surface light emitting device case is formed of a conductive metal or grounded, the wiring pattern contacts the surface light emitting device case. Then, a short circuit may occur. Since the engaging portion of the surface light emitting device case of the present invention is provided at a position where the back surface of the linear light source device is separated from the side wall of the case and between the wiring patterns of the linear light source device, the wiring pattern is It is possible to prevent the linear light source device from being short-circuited in contact with the surface light emitting device case.

  According to a third invention of the present application, in the first or second invention of the present application, the locking portion is a plate-like body formed by protruding from the bottom surface to the opening side. According to a fourth invention of the present application, in the first to third inventions of the present application, the locking portion is formed by bending the plate-like body so that the end portion abuts against the side wall. And

  The locking portion may be formed by protruding from the side surface of the case, but the locking portion of the present invention is formed by protruding from the bottom surface to the opening side of the surface light emitting device case. Thus, when the linear light source device is housed in the case, the positional deviation of the linear light source device is less likely to occur. Therefore, since the linear light source device is firmly fixed between the plate-like body and the light guide plate, the degree of adhesion between the linear light source device and the light guide plate can be increased. Furthermore, the locking portion has a pressing portion formed by bending so that the end portion of the plate-like body abuts on the side wall of the case, so that when the linear light source device is stored in the case, the pressing portion is pressed. The part is bent. Thereby, since the latching | locking part has stronger elastic force, a linear light source device can be strongly pressed against a light-guide plate.

  According to a fifth invention of the present application, in the third or fourth invention of the present application, the plate-like body is formed by cutting out the bottom surface or the bottom surface and the side wall.

  The plate-like body can be easily formed by simply cutting out the bottom surface or the bottom surface and the side wall of the surface light emitting device case without attaching a plate-like body formed of another member. Also, with this configuration, the plate-like body can be formed from the bottom surface of the surface light emitting device case, so that when the linear light source device is housed in the case, the positional deviation of the linear light source device hardly occurs, The linear light source device can be firmly fixed between the light guide plate.

  A sixth invention of the present application is a surface light emitting device in which a linear light source device and a light guide plate are housed in any of the surface light emitting device cases according to the first to fifth inventions of the present application. Thereby, it is possible to provide a surface light emitting device having high luminance and easy to assemble.

(Embodiment)
Hereinafter, a surface light emitting device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the surface light-emitting device of this embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a side view illustrating the linear light source device of the present embodiment. FIGS. 4A and 4B are diagrams illustrating a locking piece as a locking portion of the plate-like body of the surface light emitting device case of the present embodiment, where FIG. 4A is a perspective view, and FIG. 4B is a BB of FIG. It is line sectional drawing.

  As shown in FIGS. 1 and 2, a surface light emitting device 20 according to an embodiment of the present invention includes a linear light source device 1 serving as a light source of the surface light emitting device 20, and a linear shape. A light guide plate 2 that transmits light from the light source device 1 to a liquid crystal display panel (not shown), a reflection sheet 11 that reflects light from the linear light source device 1, and two prisms 13 that are different in reflection angle from the diffusion sheet 12. , 14 and a frame 15 for mounting a liquid crystal display panel on the surface light emitting device are accommodated.

  As shown in FIG. 3, the linear light source device 1 includes a substrate 5 formed in a long shape, a plurality of light emitting elements 6 arranged along the longitudinal direction of the substrate 5, and light emitting elements 6 arranged alternately. The reflector 8 that reflects the light emitted from the light emitting element 6 in the longitudinal direction in the emission direction P and the resin sealing portion 7 that seals the light emitting element 6 are provided. A wiring pattern is formed on the substrate 5 so that the light emitting elements 6 can be electrically connected. Each light emitting element 6 is supplied with power from a connection terminal 10 (see FIG. 1) connected to one end of the substrate 5. A plurality of wiring patterns 9 for conducting a continuity test of each light emitting element 6 are provided on the back surface 1b side which is the surface opposite to the light emitting surface 1a of the substrate 5. By bringing a test probe into contact with the wiring pattern 9, a continuity test of each light emitting element 6 can be performed.

  The light guide plate 2 is a flat plate having a rectangular shape in plan view, and the light from the light emitting element 6 is incident on the side surface 2a and emitted from the front as illumination light.

  As shown in FIGS. 1 and 2, the surface light emitting device case 3 is formed in a substantially rectangular box shape in plan view opened by a bottom surface 3b and a side wall 3a, and the light guide plate 2 and the linear light source device 1 are connected to each other. It is formed in a size that can be stored. The surface light emitting device case 3 can be formed by bending a thin metal plate. Inside the side wall 3a, several locking pieces 4 are formed as locking portions of the plate-like body at positions between the plurality of wiring patterns 9 of the linear light source device 1. When the light guide plate 2 and the linear light source device 1 are housed in the surface light emitting device case 3, the locking piece 4 separates the back surface 1 b of the linear light source device 1 from the side wall 3 a and the linear light source device 1. Is pressed against the light guide plate 2 to bring the linear light source device 1 into close contact with the side surface 2 a of the light guide plate 2.

  As shown in FIG. 4, the locking piece 4 is a state in which the side wall 3 a and the bottom surface 3 b of the surface light emitting device case 3 are notched and the notched portions are inclined in the direction toward the linear light source device 1. The surface light emitting device case 3 is formed to be raised from the bottom surface 3b. Although the locking piece 4 is formed by cutting out the side wall 3a and the bottom surface 3b, since there are only a few places inside the side wall 3a of the surface light emitting device case 3, the locking piece 4 is formed. There is no reduction in the strength of the side wall 3a.

  Next, the assembly of the surface light emitting device 20 of this embodiment will be described with reference to FIG. FIG. 5 is a view for explaining assembly of the surface light emitting device 20 of the present embodiment.

  First, the reflective sheet 11 is affixed to the bottom surface 3 b of the surface light emitting device case 3. Then, the frame body 15 and the light guide plate 2 are housed in that order from above, and the diffusion sheet 12 and the two prisms 13 and 14 are superimposed on the light guide plate 2 ((a) of FIG. 5). Next, the light emitting surface 1 a of the linear light source device 1 is inserted into the surface light emitting device case 3 with the light emitting surface 1 a facing the side surface 2 a of the light guide plate 2. Specifically, the back surface 1b of the linear light source device 1 is pressed against the locking piece 4 and deformed to the gap S side between the side wall 3a of the surface light emitting device case 3 and the locking piece 4 (FIG. 5). (B) and (c)), the linear light source device 1 is fixed by the locking piece 4 when the linear light source device 1 is pushed in until it is in close contact with the reflection sheet 11 (FIG. 5D). The locking piece 4 deformed to the gap side by the linear light source device 1 comes into contact with the back surface 1b of the linear light source device 1 due to an elastic action to return to the original shape, and the linear light source device 1 is brought into contact with the elastic force F. Press strongly against the light guide plate 2. Thereby, the linear light source device 1 and the light guide plate 2 are accommodated in the surface light emitting device case 3 in a state where the light emitting surface 1a of the linear light source device 1 and the side surface 2a of the light guide plate 2 are firmly adhered. The

  As described above, the surface light emitting device 20 according to the present embodiment can be simply formed into a linear shape without using a fixing material or the like by simply pushing the linear light source device 1 while deforming the locking piece 4 toward the gap S. The light source device 1 can be fixed to the surface light emitting device case 3. Further, since the locking piece 4 presses the linear light source device 1 against the light guide plate 2, the light emitting surface 1 a of the linear light source device 1 and the side surface 2 a of the light guide plate 2 are firmly adhered to each other. Light from the light source device 1 can be transmitted to the light guide plate 2 without waste, and a reduction in luminance of the surface light emitting device 20 can be prevented.

  In addition, the linear light source device 1 of the present embodiment has a plurality of wiring patterns 9 on the back surface 1b, but the locking pieces 4 are formed so as to be positioned between the plurality of wiring patterns 9, Moreover, since the locking piece 4 separates the back surface 1b of the linear light source device 1 from the side wall 3a of the surface light emitting device case 3, the wiring pattern 9 contacts the side wall 3a of the surface light emitting device case 3 and short-circuits. Can be prevented.

  If the metal forming the surface light emitting device case 3 has high rigidity, the portion cut out from the bottom surface 3b of the surface light emitting device case 3 is substantially perpendicular to the bottom surface 3b of the surface light emitting device case 3. It is good also as the latching piece which raised. Further, the height of the locking piece 4 is substantially the same as the height of the linear light source device 1 that is in contact with the light emitting surface 1a of the linear light source device 1 and the side surface 2a of the light guide plate 2 in order to increase the degree of adhesion. In this case, the width of the gap S is adjusted so that the height of the locking piece 4 can be secured, or the locking piece 4 is not only from the bottom surface 3b but also from the side wall 3a. It is also good to form a notch.

  As shown in FIG. 6, as another embodiment, the locking piece 34 is projected from the bottom surface 3b of the surface light emitting device case 3 to the opening side of the surface light emitting device case 3, and the end portion is a side wall. You may formed so that it might have a press part bent so that it might contact | abut 3a. As shown in FIG. 7, the linear light source device 1 is housed in the surface light emitting device case 3 in a state where the pressing portion of the locking piece 34 is bent by the locking piece having such a pressing portion. The linear light source device 1 can be firmly pressed against the light guide plate 2 by the elastic force of the pressing portion.

  The surface light emitting device case of the present invention can easily fix the linear light source device without using a fixing material, and can bring the linear light source device and the light guide plate into close contact with each other, so that the luminance is high. It is useful as a backlight of a liquid crystal display device with little display unevenness.

The front view which shows the surface emitting device of this embodiment AA line sectional view of FIG. Side view for explaining the linear light source device of this embodiment It is a figure explaining the locking piece of the case for surface emitting devices of this embodiment, (a) is a perspective view, (b) is the BB sectional drawing of (a). The figure explaining the assembly of the surface emitting device of this embodiment It is a figure explaining the locking piece of the case for surface emitting devices concerning other embodiment, (a) is a perspective view, (b) is CC sectional view taken on the line of (a). The figure explaining the assembly of the surface light-emitting device of other embodiment It is a figure which shows the conventional surface light-emitting device, (a) is a disassembled perspective view, (b) The dd sectional view taken on the line of (a). Side view of linear light source device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear light source device 1a Light-emitting surface 1b Back surface 2 Light guide plate 2a Side surface 3 Surface light emitting device case 3a Side wall 3b Bottom surface 4,34 Locking piece 5 Substrate 6 Light emitting element 7 Resin sealing part 8 Reflector 9 Wiring pattern 10 Connection Terminal 11 Reflective sheet 12 Diffusion sheet 13, 14 Prism 15 Frame 20 Surface light emitting device S Gap F Elastic force

Claims (6)

It is formed in a box shape opened by the bottom and side walls,
A linear light source device in which a plurality of light emitting elements are arranged on a long substrate, and a light guide plate that emits light from the light emitting elements as illumination light, the light emitting surface of the linear light source device being the light guide plate A case for a surface light emitting device stored in a state of being opposed to the side surface of
A surface light emitting device that contacts a back surface that is the surface opposite to the light emitting surface of the linear light source device, separates the back surface from the side wall, and has an engaging portion that presses the linear light source device against the light guide plate. Case for equipment. The linear light source device has a wiring pattern on the back surface,
The surface light emitting device case according to claim 1, wherein the locking portion is formed at a position between the wiring patterns when the linear light source device is housed. The case for a surface light emitting device according to claim 1, wherein the locking portion is a plate-like body formed to protrude from the bottom surface to the opening side. The surface light emitting device according to any one of claims 1 to 3, wherein the locking portion includes a pressing portion formed by bending the plate-like body so that an end portion is in contact with the side wall. Case. 5. The surface light emitting device case according to claim 3, wherein the plate-like body is formed by cutting out the bottom surface or the bottom surface and the side wall. A surface light-emitting device in which the linear light source device and the light guide plate are housed in the surface light-emitting device case according to claim 1.

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