JPH1152368A - Illumination device for liquid crystal element - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To replace an edge light type lamp unit 30 for irradiating a liquid crystal from the side without any special technique, and to apply any part to the housing 7. The present invention also provides an illuminating device for a liquid crystal element which can be used in common and which does not cause luminance unevenness in the liquid crystal element. SOLUTION: A long lamp unit 30, a light guide plate 4,
In the illuminating device for a liquid crystal element including the reflection sheet 5, the diffusion sheet 6, the housing 7, and the back cover 8, the housing 7 is made of synthetic resin, and the left and right corners of a frame forming the front part 71 of the housing 7 are provided. An illumination device for a liquid crystal element, wherein an operation rib 74 is formed so as to protrude at a portion, and a projection 742 is formed at a tip of the operation rib 74.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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 which irradiates a liquid crystal element from a side.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. FIG.
FIG. 2 is an exploded perspective view conceptually illustrating a conventional example of an edge light type illumination device for a liquid crystal element which irradiates a liquid crystal element from a side. In FIG. 4, a liquid crystal element 1 is a long cold cathode fluorescent lamp 2.
Illuminated by The long cold cathode tube 2 is covered with a reflector 3 made of a metal plate, and radiates light to the light guide plate 4.
The light is collected and illuminated. The cold cathode tube 2 and the reflector 3 constitute a lamp unit 30.
A reflection sheet 5 is disposed on the back of the light guide plate 4. Light 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 arranged on the front side of the light guide plate 4. 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 radiated 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.

Here, FIG. 5 is a view showing a little more specific manner in which the lamp unit 30 is fixed to the housing of the illumination device for a liquid crystal element. The members constituting the illuminating device are cold-cathode tubes 2
The description other than the lamp unit 30 including the reflector 3 is omitted. 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 a screw 34 through a through hole 32. Reference numeral 8 denotes a back cover made of a metal plate.

[0004]

The above-described lighting 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. Was. Therefore, processing for screwing the reflector 3,
That is, it is necessary to form the tongue piece 31 in the reflector 3 and to form a through hole 32 in the tongue piece 31 and to perform other metal processing. The lamp unit 30 thus configured lacks symmetry in its shape and structure, and cannot be used in common depending on the application location to the illumination device housing 7 for a liquid crystal element.

According to the present invention, the replacement of the edge light type lamp unit 30 for irradiating the liquid crystal from the side can be easily carried out without requiring any special technique. Can be used in common,
An object of the present invention is to provide an illuminating device for a liquid crystal element which does not cause uneven brightness in the liquid crystal element.

[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 a synthetic resin. An operation rib 74 is formed so as to protrude from the left and right corners of a frame constituting the front part 71 of the body 7, and a projection 742 is formed at the tip of the operation rib 74 to constitute an illuminating device for a liquid crystal element.

Claim 2: In the illuminating device for a liquid crystal element according to claim 1, the back cover 8 is made of a metal plate, and a corner of a peripheral wall 82 erected from the back surface 81 of the back cover. A notch 84 was formed, and an area between the left and right notches 84 of the back cover 8 was formed in a guide groove 85 to constitute an illuminating device for a liquid crystal element. Claim 3: In the illuminating device for a liquid crystal element according to any one of claims 1 and 2, the reflector 3 constituting the long lamp unit 30 has a U-shaped cross section over its entire length. An illuminating device for a liquid crystal element comprising a long structure was constructed.

Further, claim 4: claim 1 to claim 3
In the illumination device for a liquid crystal element described in any one of the above, an illumination device for a liquid crystal element in which a taper 76 is formed in a frame of a front portion 71 forming a window 72 of a housing 7. Also,
Claim 5: The lighting device for a liquid crystal element according to any one of claims 1 to 4, wherein the operating rib 74 and / or the cutout portion 84 are formed at four corners. Configured.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a view of the illuminating device as viewed from the front, and FIG. 1B is a line b− in FIG. 1A.
It is a figure showing a section along b. 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, a housing 7 made of a synthetic resin has a front portion 7 having a rectangular window 72 formed therein.
1 and a side wall 73 erected on both upper and lower frames constituting the front part 71. Operation ribs 74 are provided at four corners of the front part 71.
Are formed to protrude. Reference numeral 741 denotes a pressing portion formed at the tip of the operation rib 74. A projection 742 is further formed at the tip of the operation rib 74. The distance between the left and right protrusions 742 along the side wall 73 is set substantially equal to the length of the lamp unit 30 described later. Front 71
At both left and right frames, mounting portions 75 are formed so as to protrude slightly apart from the operation ribs 74. Reference numeral 751 denotes an opening formed in the mounting portion 75. The engaging step 7 is provided at two places on the side wall 73 erected on the upper and lower frames of the front part 71.
The projection 31 is formed. 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.

The housing 7 is covered from behind by a back cover 8. The back cover 8 is made of a metal plate, and a peripheral wall 82 erected from the back cover back surface portion 81 has an engagement hole 82 corresponding to the engagement step 731.
1 is formed. The peripheral wall 82 further includes a mounting portion 75.
In response to the above, the back cover attaching portion 83 is formed to be bent at a right angle from the peripheral wall 82. 831 is 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. And the front part 71
The area between the left and right cutouts 84 of the back cover 8 along the side wall 73 erected on the upper and lower frames is a very shallow guide groove 8.
5 is formed.

Referring to FIG. 3, 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 to the reflector 3 by a holding rubber 33. Installed and fixed. 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 connected to the cable 23 inside the holding rubber 33.
In the state of being electrically connected to the outside.
24 indicates a connector.

The above-described illumination device for a liquid crystal element comprises 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 prior art. The cold cathode tube 2 of the long lamp unit 30 is covered by a reflector 3 made of a metal plate, and radiates light to the light guide plate 4.
The light is collected and illuminated. A reflection sheet 5 is disposed on the back of the light guide plate 4. Light 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 is diffused on the front side of the light guide plate 4.
Incident on. The light incident on the diffusion sheet 6 is
It is scattered and radiated from the front. The liquid crystal element (not shown) is illuminated by light emitted from the long lamp unit 30 and uniformly diffused from the front surface of the diffusion sheet 6.

Here, the light guide plate 4, the reflection sheet 5, and the diffusion sheet 6 in the illumination device for a liquid crystal element are accommodated in a housing 7,
Next, the back of the housing 7 is covered with the back cover 8. When the housing 7 is covered with the back cover 8, the engaging step 7 is formed so as to protrude from side walls 73 erected on the upper and lower frames of the front part 71 of the housing 7.
31 is made to correspond to the engagement hole 821 formed in the peripheral wall 82 of the back cover 8, and the back cover 8 is pressed into the housing 7 so that the engagement step 731 is fitted into the engagement hole 821, The back cover 8 is attached to the housing 7. When the back cover 8 is attached to the housing 7, the long lamp unit 30 is inserted into the housing 7 through the cutout portion 84 of the back cover 8 and guided by the guide groove 85 and the side wall 73. While incorporating. When the lamp unit 30 has been inserted into the housing 7 over the entire length, the pressing portion 741 is pressed down and released, and the operating rib 74 is elastically deformed, so that the lamp unit 30 is placed between the left and right protrusions 742. Positioning can be fixed.

[0015]

As described above, according to the present invention, the housing made of synthetic resin is provided with the projections formed with the elastic operation ribs, thereby forming the lamp unit through the projections. Can be easily carried out without using screws, adhesives, or other special fixing members, and without requiring special techniques.

[0016] Then, a simple U-shaped cross-section long structure which does not have a configuration in which elastic ribs are formed at four corners of a housing made of a synthetic resin, and the reflector has a tongue and other irregular shapes. With this configuration, the lamp unit can be attached to and detached from the housing from either the left or right side of the illumination device. Further, by forming a taper in a frame constituting a window of the housing, irregular reflection of light can be prevented, and an illuminating device for a liquid crystal element which does not cause uneven brightness in the liquid crystal element can be provided.

[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 Housing 71 Front part 72 Window 73 Side wall 731 Engaging step 74 Operating rib 741 Pressing part 742 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 attaching part 831 Opening 84 Notch 85 Guide groove

Claims (5)

[Claims] 1. An illuminating device for a liquid crystal element comprising a long lamp unit, a light guide plate, a reflection sheet, a diffusion sheet, a housing, and a back cover, wherein the housing is made of a synthetic resin, and a front part of the housing is made. A lighting device for a liquid crystal element, wherein operation ribs are formed so as to protrude at left and right corners of a frame to be formed, and projections are formed at tip portions of the operation ribs. 2. The illuminating device for a liquid crystal element according to claim 1, wherein the back cover is made of a metal plate, and a notch is formed at a corner of a peripheral wall erected from the back of the back cover. An illumination device for a liquid crystal element, wherein a region between both left and right cutouts of a back cover is formed in a guide groove. 3. The illumination device for a liquid crystal element according to claim 1, wherein the reflector constituting the long lamp unit has a long cross-sectional U-shaped structure over the entire length thereof. An illuminating device for a liquid crystal element, comprising a body. 4. An illuminating device for a liquid crystal element according to claim 1, wherein a taper is formed in a frame of a front portion forming a window of the housing. Lighting device for elements. 5. An illuminating device for a liquid crystal element according to claim 1, wherein an operation rib and / or a notch is formed at four corners. Lighting device.