JP4397368B2 - Light source device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a light source device used as a light source of a display device such as a liquid crystal display device, and a manufacturing method for manufacturing the same.

  In a display device such as a television, a light source device is arranged on the rear side of a display unit having an image display surface for displaying an image on the front side.

  The light source device includes, for example, a plurality of arc tubes, a housing that holds the arc tube inside, and a reflection sheet that reflects light emitted from the arc tube to the display unit (see, for example, Patent Document 1).

  FIG. 7 is an enlarged cross-sectional view of a part of a conventional light source device. As a light source device, as shown in FIG. 7, a plurality of first holes 101 are formed in the bottom wall 100 of the housing, and a second hole 102 corresponding to the first hole 101 is provided in the reflection sheet 103. A holder 107 having two flexible pieces 104, 104 inserted through the two holes 102 and two holding pieces 106, 106 in which an intermediate portion of the arc tube 105 is fitted and held is attached to the first hole 101 of the bottom wall 100. It is also known that the intermediate portion of the arc tube 105 is held by being fitted in the holding pieces 106, 106 of the holder 107.

By the way, in the light source device in which the first hole 101 is opened in the bottom wall 100 of the casing and the second hole 102 is opened in the reflection sheet 103, dust outside the casing is separated from the first hole 101 and the second hole 102. The dust enters the housing through a gap with the holder 107, and the dust that has entered may adhere to the rear surface of the display unit and appear as image unevenness on the image display surface. Since the second hole 102 and the first hole 101 may leak to the outside of the housing, a dust sheet 108 having a size corresponding to the first hole 101 is stuck around the first hole 101 so that external dust can be removed. It is designed to prevent entry into the enclosure from the gap.
JP 2002-6755 A

  However, in the light source device configured as shown in FIG. 7, since the felt sheets 108 for the number of the first holes 101 are pasted, the number of the felt sheets 108 to be pasted when the display device is relatively large. However, the work of closing the hole for inserting and locking the holder is poor, and the felt sheet 108 may be forgotten to be pasted.

  This invention is made | formed in view of such a situation, The main objective is to provide the flexible sheet which has the obstruction | occlusion part which obstruct | occludes each of a 1st hole and a 2nd hole between a reflective sheet and the bottom wall of a housing. By providing the light source device, it is possible to improve the closing workability for closing the hole through which the holder is inserted and locked, and to eliminate forgetting to close the hole.

  Another object of the present invention is to provide a light source device capable of simplifying assembly workability despite the provision of the flexible sheet by sticking the flexible sheet to the reflection sheet or the bottom wall of the housing.

  Another object is to apply a relatively small amount of a flexible sheet on the rear surface of the reflective sheet and around each second hole, or on the front surface of the bottom wall of the housing and around each first hole. An object of the present invention is to provide a light source device capable of completely closing the first hole or the second hole with a patch.

  Another object is to attach a flexible sheet having a blocking portion that closes each of the second holes to a surface facing the bottom wall of the reflective sheet, and attach the reflective sheet to which the flexible sheet is adhered in the housing. The hole for inserting and locking the holder is completely closed by adopting a manufacturing method in which the closing portion can be pushed out from the first hole by inserting the holder into the second hole and the first hole. An object of the present invention is to provide a method of manufacturing a light source device that can improve the assembly workability of the light source device and can reduce costs.

  The light source device according to the present invention has an arc tube, a housing having a plurality of first holes in the bottom wall and holding the arc tube therein, and a plurality of second holes corresponding to the first holes, And a reflection sheet for reflecting the light emitted from the arc tube to the display portion, and a latch portion latched by being inserted into each of the first hole and the second hole. In the light source device including the holder that is held on the wall, the light source device includes a closing portion that closes each of the first hole and the second hole between the reflection sheet and the bottom wall, and the locking portion is the second. A flexible sheet to be pushed out from the first hole is arranged by being inserted through the hole.

  In this invention, the flexible sheet can be mounted by disposing the flexible sheet between the reflective sheet and the bottom wall of the housing. Accordingly, it is possible to improve the closing workability for closing the hole through which the holder is inserted and locked, and to eliminate the forgetting to close the hole. Further, by pushing the retaining portion of the holder while being inserted into the second hole, the closing portion of the flexible sheet is pushed into the first hole while being bent, and the bag is pushed out from the first hole to the outside of the bottom wall. Can do. Accordingly, the first hole and the second hole can be completely closed, and external dust can be prevented from entering the housing from the first hole and the second hole, and the light emitted from the arc tube can be prevented. It is possible to prevent leakage from the second hole and the first hole to the outside of the housing.

  The light source device according to the present invention is characterized in that the flexible sheet is attached to the reflective sheet or the bottom wall.

  In this invention, since the flexible sheet can be affixed in advance to the reflection sheet or the bottom wall of the housing, the flexible sheet can be affixed without being obstructed by other parts. The assembly workability can be simplified for the preparation.

  In the light source device according to the present invention, the flexible sheet is a surface facing the bottom surface of the reflective sheet and around each second hole, or on the front surface of the bottom wall and around each first hole. It is affixed to.

  In this invention, since the flexible sheet can be completely pasted around the first hole or the second hole, the floating of the flexible sheet due to lack of the patch can be eliminated, The first hole or the second hole can be completely blocked with a small amount of patch.

  In addition, the method of manufacturing the light source device according to the present invention includes a plurality of second holes corresponding to the first holes in a housing having a plurality of first holes in the bottom wall and in which the arc tube should be held. A reflection sheet to reflect the light emitted from the arc tube is attached, and the arc tube is held in the housing by a holder inserted into each of the first hole and the second hole and locked to the bottom wall. In the method of manufacturing a light source device, a sticking step of sticking a flexible sheet having a closing portion that closes each of the second holes to a surface facing the bottom surface of the reflective sheet, and the reflective sheet to which the flexible sheet is attached An attachment step of attaching the holder to the housing, and engaging the holder with the bottom wall while inserting the holder through the second hole and the first hole and pushing the closing portion out of the first hole. And a stopping step.

  In this invention, since the reflective sheet can be pasted on the flexible sheet in advance, the workability of attaching the flexible sheet can be improved, and the flexible sheet is attached to the housing by attaching the reflective sheet. Can be attached to. Further, by pushing the retaining portion of the holder while being inserted into the second hole, the closing portion of the flexible sheet is pushed into the first hole while being bent, and the bag is pushed out from the first hole to the outside of the bottom wall. The first hole and the second hole can be completely closed. Therefore, the assembly workability of the light source device can be improved while the hole for inserting and locking the holder can be completely closed, and the cost can be reduced.

  As described above in detail, according to the present invention, it is possible to improve the closing workability for closing the hole through which the holder is inserted and locked, and to eliminate the forgetting to close the hole. The two holes can be completely closed, and external dust can be prevented from entering the housing from the first hole and the second hole, and the light emitted from the arc tube can be prevented from entering the second hole and the first hole. Can be prevented from leaking outside the housing.

  Moreover, according to this invention, a flexible sheet | seat can be affixed without being obstructed by other components, and although it is equipped with a flexible sheet | seat, assembly workability | operativity can be simplified.

  Further, according to the present invention, the floating of the flexible sheet due to lack of the patch can be eliminated, and the first hole or the second hole can be completely closed with a relatively small amount of the patch.

  Further, according to the present invention, the assembly workability of the light source device can be improved while the hole for inserting and locking the holder can be completely closed, and the cost can be reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
1 is an exploded view showing the structure of the light source device according to the present invention, FIG. 2 is an enlarged sectional view showing the structure of the main part, FIG. 3 is an exploded sectional view showing the structure of the main part, and FIG. FIG. 5 is a side view showing the structure of the holder.

  The illustrated light source device includes a cylindrical arc tube 1 in which a plurality of tubes are juxtaposed, a housing 2 that houses the arc tube 1 and supports both ends of the arc tube 1, and light emitted by the arc tube 1. A reflection sheet 3 to be reflected on the open side of the housing 2 and a holder 4 for holding an intermediate portion of the arc tube 1 on the bottom wall 21 of the housing 2 are provided.

  The arc tube 1 is a cold cathode tube having electrodes at both ends, and an inverter circuit board is connected to the electrode of each arc tube 1, and the brightness is controlled by a pulse width modulation signal.

  The casing 2 includes a frame portion 22 having a rectangular parallelepiped shape, and a bottom wall 21 having a peripheral edge portion coupled to the frame portion 22 and closing a rear end of the frame portion 22. On the two opposite sides of the frame portion 22, fitting recesses are fitted in which both ends of the arc tube 1 are fitted. A plurality of first holes 23 are formed in the bottom wall 21 at positions facing the arc tube 1 and spaced apart in the longitudinal direction of the arc tube 1.

  The reflection sheet 3 is made of a single synthetic resin sheet, and has a plurality of second holes 31 corresponding to the first holes 23 and a plurality of pin holes. A flexible sheet 5 having a closing portion 51 that closes the first hole 23, the second hole 31, and the pin hole is attached to the back surface of the reflection sheet 3. The second hole 31 is formed to have substantially the same diameter as the first hole 23.

  The flexible sheet 5 is formed in a size corresponding to the reflective sheet 3 with a rubber-based material, and is adhered to the reflective sheet 3 with a patch such as an adhesive. In this pasting, for example, a patch is applied around each second hole 31 by a printing technique of silk screen printing, and the flexible sheet 5 wound in a roll shape is fed out and pressed against the roller with a roller. It is pasted by doing. The flexible sheet 5 is formed by a single sheet having a size corresponding to the flat portion in which the second hole 21 of the reflective sheet 3 is opened. However, the flexible sheet 5 may be formed by a plurality of sheets. Good. Further, the flexible sheet 5 may be attached by applying a patch by the above printing technique, or by applying a brush, a creper or the like.

  The holder 4 is connected to a plate-shaped core portion 41, two flexible pieces 42 and 42 that are connected to one end of the core portion 41 and inserted into the first hole 23 and the second hole 31, and the other end of the core portion 41. It has two holding pieces 43 and 43 in which the middle part of the arc tube 1 is fitted and held.

  The flexible pieces 42, 42 are opposed to both side surfaces of the core portion 41, bend toward the core portion 41 side when inserted through the first hole 23 and the second hole 31, and move into the first hole 23 and the second hole 31. When inserted, it is elastically restored and is configured to be locked to the hole edge of the first hole 23. The flexible pieces 42 and 42 constitute a locking portion.

  The holding pieces 43, 43 have a curved portion 43a that is curved corresponding to the outer shape of the arc tube 1, and a guide portion 43b that extends from the tip of the curved portion 43a in a distance direction. It is configured to bend in the separating direction when fitted. Two of the holders 4 configured in this way are integrally connected by a plate-like connecting member 6. The connecting member 6 is formed integrally with the other end portion of the core portion 41, and a knob portion 61 that faces the holding pieces 43, 43 protrudes from the central portion of the connecting member 6.

  In the light source device configured as described above, the reflection sheet 3 with the flexible sheet 5 attached to the rear surface is inserted into the housing 2 so that the flexible sheet 5 is on the rear side, and placed on the bottom wall 21. To do. The headed pin 7 is inserted into the pin hole opened in the reflecting sheet 3 and the bottom wall 21, and the tip of the headed pin 7 is crimped to attach the reflecting sheet 3 to the bottom wall 21.

  By pressing the closing portion 51 while inserting the flexible pieces 42 and 42 of the holders 4 and 4 integral with the connecting member 6 held by the knob portion 61 into the second hole 31, the closing portion 51 is bent and the first portion is bent. It is pushed into the hole 23, and further pushed out from the first hole 23 into a bag shape. The flexible pieces 42 and 42 are elastically restored and locked to the hole edge of the first hole 23. Therefore, the holder 4 can be locked to the bottom wall 21. Thereafter, the intermediate portion of the arc tube 1 can be held by the holder 4 by fitting the intermediate portion of the arc tube 1 between the holding pieces 43, 43 of the holder 4. The arc tube 1 can be supported by the frame portion 22 by being fitted into the fitting recess.

  In the light source device assembled in this way, since the flexible sheet 5 is attached in advance to the rear surface of the reflective sheet 3, there is no need to separately attach the flexible sheet 5 as a closing member, and the first hole 23 and The closing workability of the second hole 31 can be improved, and the forgetting to close the first hole 23 and the second hole 31 can be eliminated.

  Since the flexible sheet 5 is affixed around the second hole 31, the second hole 31 can be completely closed, and the closing portion 51 extruded from the first hole 23 to the outside is a bag. As shown in FIG. 2, the first hole 23 can be completely closed by contacting the edge of the first hole 23, and dust can be completely prevented from entering. Leakage from the second hole 31 and the first hole 23 to the outside of the housing 2 can be prevented.

Further, the light source device configured as described above is manufactured by the following manufacturing method.
a) The flexible sheet 5 that closes the second hole 31 of the reflective sheet 3 having the second hole 31 is attached to the surface of the reflective sheet 3 that faces the bottom wall 21 with a patch.
b) The reflective sheet 3 with the flexible sheet 5 attached is inserted into the housing 2 and attached to the bottom wall 21.
c) Insert the flexible pieces 42, 42 of the holder 4 into the first hole 23, and push the flexible pieces 42, 42 into the first hole 23 by extruding the closed part 51 to the outside of the first hole 23 while bending it. Lock.
d) The intermediate portion of the arc tube 1 is fitted and held in the holding pieces 43 and 43 of the holder 4.

  FIG. 6 is a partially enlarged cross-sectional view showing another embodiment of the light source device. In the light source device, a third hole 81 through which the flexible pieces 42 and 42 (locking portions) of the holder 4 are inserted is formed between the connecting member 6 integrally formed with the holder 4 and the bottom wall 21. The flexible plate 8 is arranged in place of the flexible sheet 5. The flexible plate 8 is made of a rubber material.

In this embodiment, the vibration of the arc tube 1 can be absorbed by the flexible plate 8, the vibration of the arc tube 1 can be prevented from being transmitted to the bottom wall 21 of the housing 2, and the resonance of the housing 2 can be suppressed. Can be reduced. Therefore, it is possible to reduce the noise caused by the resonance of the housing 2. The vibration of the arc tube 1 occurs, for example, when the brightness of the arc tube 1 is controlled by a pulse width modulation signal.
Since other configurations and operations are the same as those of the embodiment shown in FIGS. 1 to 5, the same components are denoted by the same reference numerals, and detailed descriptions and descriptions of the operations and effects are omitted.

  In the embodiment described above, the flexible sheet 5 is pasted around the second hole 31 on the rear surface of the reflective sheet 3. In addition, the flexible sheet 5 is formed on the bottom wall 21 of the housing 2 with the first hole 23. It is good also as a structure stuck around. In addition, the flexible sheet 5 may be attached between the reflective sheet 3 and the bottom wall 21 without being attached to the reflective sheet 3 and the bottom wall 21.

  In the embodiment described above, the flexible sheet 5 having a size corresponding to the reflective sheet 3 is provided. However, the flexible sheet 5 includes a plurality of flexible sheets 5 provided corresponding to, for example, one arc tube 1. The second hole 31 may be of a size that can be closed, or the plurality of second holes 31 provided corresponding to the adjacent arc tubes 1 can be closed. The size of the flexible sheet 5 is not particularly limited.

It is an exploded view which shows the structure of the light source device which concerns on this invention. It is an expanded sectional view which shows the structure of the principal part of the light source device which concerns on this invention. It is the expanded sectional view which decomposed | disassembled which shows the structure of the principal part of the light source device which concerns on this invention. It is a front view which shows the structure of the housing of the light source device which concerns on this invention. It is a side view which shows the structure of the holder of the light source device which concerns on this invention. It is sectional drawing which expanded a part which shows other embodiment of the light source device which concerns on this invention. It is sectional drawing to which some conventional light source devices were expanded.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emission tube 2 Housing | casing 21 Bottom wall 23 1st hole 3 Reflective sheet 31 2nd hole 4 Holder 42 Flexible piece (locking part)
5 Flexible sheet 51 Blocking part

Claims (4)

  Light emitted from the arc tube, a housing having a plurality of first holes in the bottom wall and holding the arc tube inside, a plurality of second holes corresponding to the first holes, and the arc tube emitting light And a holder that holds the arc tube on the bottom wall having a locking portion that is locked by being inserted through each of the first hole and the second hole. In the light source device, the light source device includes a closing portion that closes each of the first hole and the second hole between the reflection sheet and the bottom wall, and the locking portion is inserted through the second hole, thereby A light source device characterized in that a closing portion is provided with a flexible sheet to be pushed out from the first hole.   The light source device according to claim 1, wherein the flexible sheet is attached to the reflective sheet or the bottom wall.   2. The light source according to claim 1, wherein the flexible sheet is attached to a surface facing the bottom surface of the reflection sheet and around each second hole, or a front surface of the bottom wall and around each first hole. apparatus.   A reflection sheet having a plurality of first holes in the bottom wall and having a plurality of second holes corresponding to the first holes in a casing in which the arc tubes are to be held, and for reflecting light emitted from the arc tubes. In the method of manufacturing the light source device in which the arc tube is held in the housing by a holder inserted into each of the first hole and the second hole and locked to the bottom wall, An attaching step of attaching a flexible sheet having a closing portion to be closed to a surface opposite to the bottom surface of the reflective sheet; an attaching step of attaching the reflective sheet to which the flexible sheet is attached; And a locking step of locking the holder to the bottom wall while inserting the holder through the second hole and the first hole and pushing the blocking portion outward from the first hole. Production method.

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