JPH0746905Y2 - Lighting equipment - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention, in a car telephone or the like, guides light from a liquid crystal light-emitting body to a liquid crystal display to improve visual recognition in the dark, and to detect light from a keyboard light-emitting body. The present invention relates to a lighting device used for guiding light to a key top to prevent a key operation error in darkness.

2. Description of the Related Art Conventionally, as a lighting device of this type, there is a configuration in which light from a liquid crystal light-emitting body and light from a keyboard light-emitting body are guided to a liquid crystal display and a key top by using separately formed light guide plates. Are known. Hereinafter, the conventional lighting device will be described with reference to the drawings.

3 and 4 show a main part of a mobile phone using a conventional lighting device, FIG. 3 is an exploded perspective view, and FIG. 4 is a sectional view in an assembled state.

As shown in FIGS. 3 and 4, a liquid crystal holder 52 is supported on an end portion of a printed circuit board 51, and a liquid crystal light guide plate 53 and a liquid crystal display 54 above the liquid crystal light guide plate 53 are held by the liquid crystal boulder 52. A liquid crystal connector 55 is connected to the liquid crystal display 54 and the printed circuit board 51 along the outer end surface of the liquid crystal holder 52. The liquid crystal light guide plate 53 is made of acrylic resin, and is formed so as to become thinner gradually from the inner end side to the outer end side, and the inner end surface has recesses 56 formed at a plurality of positions, and each recess 56 has a printed circuit board. A liquid crystal light emitting body 57 including an LED (light emitting diode) mounted on the 51 is inserted. The liquid crystal display 54, the liquid crystal connector 55, the liquid crystal light emitter 57, etc. are covered with a frame-shaped liquid crystal bracket 58 made of an insulating material, and the leg portion 58a of the liquid crystal bracket 58 is covered.
Is attached to the printed circuit board 51, and the liquid crystal display 54 and the like are fixed. The keyboard light guide plate 59 is made of acrylic resin, and a plurality of operation holes 60 are vertically and horizontally arranged in the keyboard light guide plate 59, and recessed portions 61 are formed at a plurality of positions on the back surface at substantially even positions. . Keyboard light guide plate
A printed circuit board 62 is provided on the back of the 59.
A keyboard light-emitting body 63 formed of an LED or the like mounted on 62 is inserted into each recess 61. Switch contacts 64 are provided on the printed circuit board 62 in the respective operation holes 60 of the keyboard light guide plate 59. These keyboard light guide plates 5
9. The printed circuit board 62 and the like are mounted on the printed circuit board 51. A key sheet 65 is provided on the keyboard light guide plate 59, and a switch operation unit 67 on the back side of the key top 66 is provided.
Is inserted into each operation hole 60. Each of the above members is housed in a main body case 68, the key top 66 is exposed through a hole 69 formed in the main body case 68, and the main body case 68 is provided with a liquid crystal panel 70 corresponding to the liquid crystal display 54.

In the above structure, the liquid crystal light guide plate 53 guides the light from the liquid crystal light emitter 57 to illuminate the liquid crystal display 54 from the back. At this time, since the liquid crystal light guide plate 53 is formed so as to become thinner as it is separated from the liquid crystal light emitter 57 side as described above, it is possible to illuminate the entire liquid crystal display 54 substantially uniformly. Therefore, the liquid crystal display 54 can be clearly recognized even in the dark. On the other hand, the light from the keyboard luminous body 63 is guided by the keyboard light guide plate 59 to guide the key top 66.
Can be illuminated from the back, and therefore key operation mistakes can be prevented in the dark.

However, in the above-mentioned conventional lighting device, the liquid crystal light guide plate 53 is used.
And a keyboard light guide plate 59 are formed separately. Moreover, since the liquid crystal light guide plate 53 has an inclined surface so that the liquid crystal light guide plate 53 becomes thinner as it is separated from the liquid crystal light emitter 57 side, it is necessary to hold the liquid crystal light guide plate 53 and the liquid crystal display 54 by the liquid crystal holder 52. . Therefore, the number of parts to be assembled increases,
Therefore, there are problems such as poor assembly workability and high cost.

The present invention solves the above-mentioned conventional problems and can reduce the number of parts to be assembled, thus improving the assembly workability and reducing the cost. It is an object of the present invention to provide a lighting device configured as described above.

Means for Solving the Problems The technical solution of the present invention for achieving the above object is
The liquid crystal light guide plate for guiding the light from the liquid crystal light emitter to the liquid crystal display and the keyboard light guide plate for guiding the light from the keyboard light emitter to the key top are integrated.

The liquid crystal light-emitting body is disposed on the outer end side, the liquid crystal light guide plate is separated from the liquid crystal light-emitting body, and is formed so as to become gradually thinner toward the keyboard light guide plate side. A liquid crystal connector mounted on the printed circuit board by abutting the printed circuit board on the liquid crystal light emitter side and on the side separated from the liquid crystal light emitter, and forming a notch at the boundary between the liquid crystal light guide plate and the keyboard light guide plate. And a liquid crystal connector connected to the liquid crystal display by a cable is preferably connected in the cutout.

Therefore, according to the present invention, the light from the liquid crystal light emitter can be guided to the liquid crystal display by the liquid crystal light guide plate and illuminated to be clearly recognized in the dark, while the light from the keyboard light emitter can be recognized by the keyboard. The light guide plate guides the light to the key top and illuminates it to prevent key operation mistakes in the dark.
The number of parts to be assembled can be reduced by integrating the liquid crystal light guide plate and the keyboard light guide plate.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the essential parts of an automobile telephone using an illuminating device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view, and FIG. 2 is a sectional view in an assembled state.

As shown in FIG. 1 and FIG. 2, a plurality of liquid crystal light emitting bodies 2 including LEDs are mounted on one end of the printed circuit board 1 at substantially equal intervals, and a liquid crystal connector 3 is mounted on the side of the middle part. On the other end side, contact points 4 (first
(Not shown in the drawing) are arranged in rows and columns, and a plurality of keyboard light-emitting bodies 5 made of LEDs or the like are mounted at substantially even positions of the contact portions 4. The liquid crystal light guide plate 6 has recessed portions 7 corresponding to the liquid crystal light-emitting body 2 at a plurality of substantially evenly divided positions on the outer end surface, and the back side is from the outer end side to the inner end side (keyboard light guide plate 8 side described later). Is formed so as to gradually incline toward the surface side as it goes to the inner end side, and becomes gradually thinner from the outer end side to the inner end side. Contact portions 6a and 6b are formed. The keyboard light guide plate 8 has a plurality of operation holes 9 arranged in rows and columns corresponding to the contact portions 4, and a recessed portion 10 is formed corresponding to the keyboard light emitting body 4. These liquid crystal light guide plate 6 and keyboard light guide plate 8
Is integrally formed of acrylic resin, and a notch 11 is formed at the boundary between the liquid crystal light guide plate 6 and the keyboard light guide plate 8 so as to correspond to the liquid crystal connector 3. An integrated liquid crystal light guide plate 6 and keyboard light guide plate 8 are placed on the printed circuit board 1, each liquid crystal light emitter 2 is inserted into each recess 7, and each keyboard light emitter 5 is inserted into each recess 10. The notch 11 is fitted in the liquid crystal connector 3. A liquid crystal display 12 is mounted on the liquid crystal light guide plate 6, and a liquid crystal connector 14 connected to the liquid crystal display 12 by a cable 13 is connected to the liquid crystal connector 3 in the notch 11. The liquid crystal display 12, the liquid crystal light-emitting body 2 and the like are covered with a frame-shaped liquid crystal bracket 15 made of an insulating material, and the leg portions 15a of the liquid crystal bracket 15 are attached to the printed circuit board 1 so that the liquid crystal display 12 has the liquid crystal light guide plate 6. And the like are fixed to the printed circuit board 1. A key sheet 16 is provided on the keyboard light guide plate 8, and a switch operation portion 18 on the back side of the key top 17 is inserted into each operation hole 9. Each of the above components is stored in the body case 19, and the key top 17 is the body case.
A liquid crystal panel 21 corresponding to the liquid crystal display 12 is provided in the main body case 19 so as to be exposed from a hole 20 formed in the liquid crystal display device.

In the above structure, the liquid crystal light guide plate 6 guides the light from the liquid crystal light emitter 2 to illuminate the liquid crystal display 12 from the back. At this time, the liquid crystal light emitters 2 are arranged at substantially equal intervals as described above, and the liquid crystal light guide member 6 is formed so as to become gradually thinner as it is separated from the liquid crystal light emitter 2 side as described above. The entire liquid crystal display 12 can be illuminated substantially evenly and can be clearly identified in the dark. On the other hand, as described above, the keyboard light emitters 5 provided at the substantially evenly divided positions.
The key light guide plate 8 guides the light from the keys to illuminate the key tops 17 from the back substantially evenly. Therefore, it is possible to prevent a key operation error in the dark.

Since the liquid crystal light guide plate 6 and the keyboard light guide plate 8 are integrally formed as described above, even if the liquid crystal light guide plate 6 has an inclined surface, a liquid crystal holder for holding this can be unnecessary. The number of parts to be assembled can be reduced. Further, since the liquid crystal light-emitting body 2 is arranged on the outer end side of the liquid crystal light-guide plate 6, the liquid-crystal light-guide plate 6 can be arranged substantially evenly, and the liquid crystal light-guide plate 6 is separated from the liquid crystal light-emitting body 2 and the keyboard guide is provided. Since the thickness is gradually reduced toward the light plate 8 side, the entire liquid crystal display 12 can be illuminated substantially evenly. Moreover, since the liquid crystal light guide plate 6 is in contact with the printed circuit board 1 on the side of the liquid crystal light emitter 2 and on the side of the liquid crystal light emitter 2, the liquid crystal display 12 and the like can be reliably supported. Further, a notch 11 is formed at the boundary between the liquid crystal light guide plate 6 and the keyboard light guide plate 8, and a notch 13 is formed between the liquid crystal connector 3 mounted on the printed board 1 and the liquid crystal display 12 and a liquid crystal connector 14 connected by a cable 13. Since the liquid crystal light-emitting bodies 2 are connected inside the liquid crystal light-emitting body 2 as described above, the liquid-crystal light-emitting bodies 2 can be arranged substantially evenly on the outer end side of the liquid-crystal light-guide plate 6, and the integrated strength of the liquid crystal light-guide plate 6 and the keyboard light-guide plate 8 can be increased. LCD connector 3, while maintaining
14 can be arranged compactly.

As described above, according to the present invention, the liquid crystal light guide plate for guiding the light from the liquid crystal light emitter to the liquid crystal display and the keyboard light guide plate for guiding the light from the keyboard light emitter to the key top are provided. Since they are integrated, the number of parts to be assembled can be reduced, and further, the number of parts to be assembled can be further reduced by eliminating the need for a liquid crystal holder if necessary, thus improving the assembly workability. Moreover, the cost can be reduced.

Further, by arranging the liquid crystal light-emitting body on the outer end side, the liquid crystal light-emitting body can be arranged substantially evenly over the entire surface, and further, the liquid crystal light guide plate is separated from the liquid crystal light-emitting body, and becomes gradually thinner toward the keyboard light guide plate side. With such a structure, the entire liquid crystal display can be illuminated substantially evenly.

Further, the liquid crystal light guide plate is brought into contact with the printed circuit board on the liquid crystal light emitter side and on the side separated from the liquid crystal light emitter, whereby the liquid crystal display or the like can be reliably supported.

Further, by forming a notch at the boundary between the liquid crystal light guide plate and the keyboard light guide plate, and by connecting the liquid crystal connector mounted on the printed circuit board and the liquid crystal connector connected to the liquid crystal display by a cable in the notch, It is possible to arrange the liquid crystal light emitters on the outer edge side of the liquid crystal light guide plate almost evenly as shown in the figure, and to arrange the liquid crystal connector compactly while maintaining the integrated strength of the liquid crystal light guide plate and the keyboard light guide plate. You can

[Brief description of drawings]

FIGS. 1 and 2 show a main part of an automobile telephone using an illuminating device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view in an assembled state, FIG. FIG. 4 shows a main part of an automobile telephone using a conventional lighting device,
FIG. 3 is an exploded perspective view, and FIG. 4 is a sectional view in an assembled state. 1 ... Printed circuit board, 2 ... Liquid crystal light emitter, 3 ... Liquid crystal connector, 4 ... Contact part, 5 ... Keyboard light emitter, 6 ...
… Liquid crystal light guide plate, 8 …… Keyboard light guide plate, 11 …… Notch,
12 …… Liquid crystal display, 14 …… Liquid crystal connector, 15 …… Liquid crystal bracket, 16 …… Key sheet, 17 …… Key top, 19…
… Body case.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuo Ogasawara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Katsura Kuwahara 1006 Kadoma, Kadoma City Osaka Prefecture Matsuda Electric Industrial

Claims (4)

[Scope of utility model registration request] 1. An illumination device in which a liquid crystal light guide plate for guiding light from a liquid crystal light emitter to a liquid crystal display and a keyboard light guide plate for guiding light from a keyboard light emitter to a key top are integrated. 2. The liquid crystal light-emitting body is arranged on the outer end side, and the liquid crystal light guide plate is formed so as to be separated from the liquid crystal light-emitting body and become thinner as it reaches the keyboard light guide plate side.
Illumination device described. 3. The liquid crystal light guide plate is in contact with the printed circuit board on the side of the liquid crystal light emitter and on the side of separation from the liquid crystal light emitter.
Or the illumination device according to 2. 4. A notch is formed at a boundary between the liquid crystal light guide plate and the keyboard light guide plate, and a liquid crystal connector mounted on a printed circuit board and a liquid crystal connector connected to a liquid crystal display by a cable are connected in the notch. The lighting device according to claim 1.