JP3567272B2 - Illumination device for liquid crystal element - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an illuminating device for a liquid crystal element, and more particularly to an edge-light type illuminating device for a liquid crystal element that irradiates a liquid crystal element from a side.
[0002]
[Prior art]
A conventional example will be described with reference to FIG.
FIG. 4 is an exploded perspective view conceptually illustrating a conventional example of an edge light type illumination device for a liquid crystal element that irradiates a liquid crystal element from a side. In FIG. 4, a liquid crystal element 1 is illuminated by a long cold cathode tube 2. The long cold cathode tube 2 is covered with a reflector 3 made of a metal plate, and the emitted light is introduced into the light guide plate 4 to be condensed and illuminated. The cold cathode tube 2 and the reflector 3 constitute a lamp unit 30. A reflection sheet 5 is arranged on the back of the light guide plate 4. Light that is introduced from the cold cathode tube 2 to the light guide plate 4 and condensed is radiated through the light guide plate 4 and the reflection sheet 5 and enters the diffusion sheet 6 disposed on the front side of the light guide plate 4. The light incident on the diffusion sheet 6 is uniformly diffused and radiated from the front surface of the diffusion sheet 6. The liquid crystal element 1 is illuminated by the diffused light emitted from the diffusion sheet 6. In the above configuration, the illumination device for the edge light type liquid crystal element includes the cold cathode tube 2, the reflector 3, the light guide plate 4, the reflection sheet 5, and the diffusion sheet 6.
[0003]
Here, FIG. 5 is a diagram specifically showing a part where the lamp unit 30 is fixed to the housing of the illumination device for a liquid crystal element. The components of the illuminating device other than the lamp unit 30 including the cold cathode tube 2 and the reflector 3 are not described. In FIG. 5, a tongue piece 31 is formed integrally with a reflector 3 that covers a cold cathode tube 2 made of a metal plate, and a through hole 32 is formed in the tongue piece 31. The reflector 3 is fixed to the housing 7 of the illuminating device made of synthetic resin by screws 34 through the through holes 32. Reference numeral 8 denotes a back cover made of a metal plate.
[0004]
[Problems to be solved by the invention]
The above-described illumination device for a liquid crystal element is implemented by attaching and detaching the reflector 3 to and from the housing 7 with the screw 34 when the lamp unit 30 is attached to and detached from the housing 7. Therefore, it is necessary to screw the reflector 3, that is, to form a tongue piece 31 on the reflector 3, form a through hole 32 in the tongue piece 31, and perform other metal processing. The lamp unit 30 thus configured lacks symmetry in its shape and structure, and cannot be commonly used depending on the application location to the illumination device housing 7 for a liquid crystal element.
[0005]
According to the present invention, the replacement of the edge light type lamp unit 30 that irradiates the liquid crystal from the side can be easily performed without requiring any special technique, and the lamp unit 30 can be commonly used in any application portion to the housing 7. there is provided a liquid crystal device illumination device capable of.
[0006]
[Means for Solving the Problems]
Claim 1: In a lighting device for a liquid crystal element comprising a long lamp unit 30, a light guide plate 4, a reflection sheet 5, a diffusion sheet 6, a housing 7, and a back cover 8, the housing 7 is made of synthetic resin. Operation ribs that bend and elastically deform are formed at the left and right corners of the frame constituting the front part 71 of the body, and a lamp unit locking projection 742 is formed at the tip of the operation rib 74. The back cover 8 is formed of a metal plate. A notch 84 is formed at the corner of the peripheral wall 82 erected from the back cover back part 81, and the area between the left and right notches 84 of the back cover 8 is the front part 71 and the front part 71. An illuminating device for a liquid crystal element was formed in a region in which the lamp unit 30 was to be incorporated, by a side wall 73 provided upright and a guide groove 85 having a very small depth formed in the back cover 8 .
[0007]
Claim 2: In the illuminating device for a liquid crystal element according to claim 1, the reflector constituting the long lamp unit is formed of a long structure having a U-shaped cross section over the entire length thereof. The lighting device for the device was constructed.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a diagram of the illumination device viewed from the front, and FIG. 1B is a diagram illustrating a cross section taken along line bb in FIG. 1A. 2A and 2B are diagrams illustrating a state where the lamp unit is attached to and detached from the housing of the illumination device. FIG. 2A is a perspective view, and FIG. 2B is a diagram illustrating an operation rib.
Referring to FIGS. 1 and 2, the housing 7 made of a synthetic resin includes a front part 71 having a rectangular window 72 formed thereon and side walls 73 erected on both upper and lower frames constituting the front part 71. At four corners of the front part 71, operation ribs 74 are formed so as to protrude. Reference numeral 741 denotes a pressing portion formed at the tip of the operation rib 74. A lamp unit locking projection 742 is further formed at the tip of the operation rib 74. The distance between the left and right lamp unit locking projections 742 along the side wall 73 is set substantially equal to the length of the lamp unit 30 described later. At both left and right frames of the front portion 71, mounting portions 75 are formed so as to be slightly separated from the operation ribs 74. Reference numeral 751 denotes an opening formed in the mounting portion 75. Further, two engaging step portions 731 are formed to protrude at two locations on the side wall 73 erected on both the upper and lower frames of the front portion 71. A taper 76 is formed in the frame of the front portion 71 forming the window 72 of the housing 7, and the area of the window 72 is gradually reduced from the surface of the diffusion sheet 6 toward the outside.
[0009]
The housing 7 is covered from behind by a back cover 8. The back cover 8 is made of a metal plate, and an engaging hole 821 is formed in a peripheral wall 82 erected from the back cover back surface portion 81 so as to correspond to the engaging step 731. A back cover attaching portion 83 is formed on the peripheral wall 82 at a right angle from the peripheral wall 82 so as to correspond to the attaching portion 75. Reference numeral 831 denotes an opening formed in the back cover attaching portion 83. The peripheral wall 82 is cut out at four corners to form a notch 84. The region between the left and right cutouts 84 of the back cover 8 along the side walls 73 provided on the upper and lower frames of the front part 71 is the front part 71, the side wall 73 provided on the front part 71, An extremely shallow guide groove 85 formed in the lid 8 constitutes a region in which the lamp unit 30 is incorporated.
[0010]
Referring to FIG. 3, the lamp unit will be described. The lamp unit 30 includes a cold cathode tube 2 and a reflector 3 made of a metal plate that reflects light. The cold cathode tube 2 is attached and fixed to the reflector 3 by holding rubber 33. You. The electrode terminals 21 of the cold cathode tube 2 are led out from both left and right ends. That is, the left end electrode terminal 21 is connected to the reflector 3 at the soldering portion 22, and the right end electrode terminal is led out to the outside while being electrically connected to the cable 23 inside the holding rubber 33. Reference numeral 24 denotes a connector.
[0011]
The above-described illumination device for a liquid crystal element includes a long lamp unit 30, a light guide plate 4, a reflection sheet 5, a diffusion sheet 6, a housing 7, and a back cover 8, as in the above-described conventional example. The cold cathode tube 2 of the long lamp unit 30 is covered with a reflector 3 made of a metal plate, and the emitted light is introduced into the light guide plate 4 to be condensed and illuminated. A reflection sheet 5 is arranged on the back of the light guide plate 4. Light that is introduced from the cold cathode tube 2 to the light guide plate 4 and condensed is radiated through the light guide plate 4 and the reflection sheet 5 and enters the diffusion sheet 6 disposed on the front side of the light guide plate 4. Light incident on the diffusion sheet 6 is uniformly diffused from the front surface of the diffusion sheet 6 and emitted. A liquid crystal element (not shown) is illuminated with light emitted from the long lamp unit 30 and uniformly diffused from the front surface of the diffusion sheet 6.
[0012]
Here, the light guide plate 4, the reflection sheet 5, and the diffusion sheet 6 in the illuminating device for a liquid crystal element are housed in a housing 7, and then the back of the housing 7 is covered with a back cover 8 . When the housing 7 is covered with the back cover 8, the housing 7 is formed on the engaging step 731 protruding from the side walls 73 erected on both the upper and lower frames of the front portion 71 of the housing 7 and on the peripheral wall 82 of the back cover 8. When the back cover 8 is pressed into the housing 7, the engagement step 731 is fitted into the engagement hole 821, and the back cover 8 is attached to the housing 7. Can be When the back cover 8 is attached to the housing 7, the pressing portion 741 is pressed downward to bend and elastically deform, and then the long lamp unit 30 is inserted through the cutout portion 84 of the back cover 8. It is inserted into the housing 7 . At this time, the lamp unit 30 is incorporated while being guided by a very shallow guide groove 85 formed in the front part 71, the side wall 73 erected on the front part 71, and the back cover 8. When the lamp unit 30 is inserted into the housing 7 over the entire length, the pressing portion 741 is pressed down and released, and the operation rib 74 is bent and elastically deformed, thereby locking the lamp unit 30 to the left and right lamp units. Positioning and fixing can be performed between the protrusions 742.
[0013]
【The invention's effect】
Be as described above, according to the present invention, by protrude the operation rib bent elastically deformed to form a lamp unit locking protrusion in a housing made of synthetic resin, through the lamp unit locking protrusion The mounting and dismounting of the lamp unit can be easily performed without using any special technique without using screws, adhesives or other special fixing members.
An operation rib having elasticity is formed at four corners of a housing made of synthetic resin, and a reflector is made of a simple U-shaped long structure having no tongue and other irregular shapes. By doing so, the mounting and dismounting of the lamp unit with respect to the housing can be performed from either the left or right side of the illumination device .
[Brief description of the drawings]
FIG. 1 illustrates an embodiment.
FIG. 2 is a diagram illustrating a place where a lamp unit is attached and detached.
FIG. 3 is a diagram illustrating a lamp unit.
FIG. 4 is a diagram illustrating a conventional example.
FIG. 5 is a diagram showing a conventional example in which a lamp unit is fixed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal element 2 Cold cathode tube 21 Electrode terminal 22 Soldering part 23 Cable 24 Connector 3 Reflector 30 Lamp unit 31 Tongue piece 32 Through hole 33 Holding rubber 34 Screw 4 Light guide plate 5 Reflection sheet 6 Diffusion sheet 7 Case 71 Front part 72 Window 73 Side wall 731 Engaging step 74 Operating rib 741 Pressing part 742 Lamp unit locking projection 75 Mounting part 751 Opening hole 76 Taper 8 Back lid 81 Back lid back part 82 Peripheral wall 821 Engaging hole 83 Back lid mounting part 831 Opening 84 Notch 85 Guide groove

Claims (2)

In an illumination device for a liquid crystal element including a long lamp unit, a light guide plate, a reflection sheet, a diffusion sheet, a housing, and a back cover,
The housing is constituted by a synthetic resin, the operation rib bent elastically deformed in the corner portions of the left and right frame constituting a front portion of the housing is protruded to form a lamp unit locking protrusion at the tip portion of the operation ribs,
The back cover is made of a metal plate, and a notch is formed at the corner of the peripheral wall that is erected from the back of the back cover,
The area between the left and right cutouts of the back lid is formed in the area where the lamp unit is installed by the front part, the side walls erected on the front part, and the extremely shallow guide groove formed in the back lid. Illumination device for a liquid crystal element. The lighting device for a liquid crystal element according to claim 1,
An illumination device for a liquid crystal element, wherein a reflector constituting a long lamp unit is formed of a long structure having a U-shaped cross section over the entire length thereof.

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