JP3261928B2 - Liquid crystal unit floodlight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal unit projection device mounted on a cordless telephone or the like.

[0002]

2. Description of the Related Art A conventional liquid crystal unit projection apparatus of this type will be described with reference to a partially cutaway perspective view shown in FIG. 3 and an exploded perspective view shown in FIG.

As shown in FIGS. 3 and 4, a holder 52 is held on a printed board 51 by holding claws 53. The holder 52 holds a liquid crystal 54, a light guide plate 55 and a reflection plate 56 by holding claws 57. A chip LED 58 is mounted on the printed circuit board 51 so as to project light upward. The chip LED 58 corresponds to the reflection hole 59 of the holder 52. A display element 61 is mounted on a tape 60 extending from the liquid crystal 54, and an electrode 62 is provided at the tip of the tape 60. Tape 60 is holder 5
The electrode 62 is guided outward from a notch 63 formed in the second connector 2, and the electrode 62 is connected to a connection connector 64 mounted on the printed circuit board 51. Since the tape 60 lacks electrical insulation,
An insulating sheet 65 interposed between the printed board 51 and the tape 60 is attached.

The operation of the above configuration will be described below. When the power is turned on, the light emitted from the chip LED 58 is made to enter the light guide plate 55 through the reflection hole 59 of the holder 52, and the entire back surface of the liquid crystal 54 is almost uniformly illuminated by the reflection plate 56. Thus, the display of the liquid crystal 54 can be confirmed in the dark.

[0005]

However, in the above-mentioned conventional liquid crystal unit light projecting device, the light guide plate 55 and the reflection plate 56, the insulating sheet 60, the connection connector 64 and the like are constituted by different parts. Not only is the assembly workability inferior, but also there are problems such as high cost.

The present invention is to solve such a conventional problem, and it is possible to improve the assembling workability by reducing the number of assembly parts, and to reduce the cost. It is an object of the present invention to provide a unit light emitting device.

[0007]

The technical means of the present invention for achieving the above object is to provide a holder attached to a printed circuit board and holding a liquid crystal, and a holder mounted on the printed circuit board. LED that emits light in parallel
A diffused surface formed on the printed circuit board, and a dimple provided in the holder and guiding light from the LED so that the back surface of the liquid crystal is illuminated almost uniformly by cooperation with the diffused reflection surface. A light guide plate having a portion ,
The light guide plate is made of an elastic material, and the liquid crystal is moved from the holder to the holder.
Is held .

Another technical means of the present invention for achieving the above object is the above technical means, wherein the liquid crystal and the printed circuit board are electrically connected by a zebra rubber connector inside the holder.

In each of the above technical means, the light guide plate is formed of an elastic body to hold the liquid crystal with respect to the holder, the irregular reflection surface of the printed circuit board is formed by white printing, and the interior of the holder is white. It is preferred to configure.

[0010]

According to the present invention constructed as described above, the dimples formed on the light guide plate and the irregular reflection surface on the printed circuit board make the light from the LED almost uniformly illuminate the entire back surface of the liquid crystal. Therefore, the number of assembly parts can be reduced.

[0011] Further, by electrically connecting the liquid crystal and the printed circuit board with the Sebra rubber connector, the number of assembly parts can be further reduced.

[0012]

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

1 and 2 show a liquid crystal unit light projecting device according to an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view, and FIG. 2 is an exploded perspective view.

As shown in FIGS. 1 and 2, two pairs of holding claws 4 formed on both lower sides of the holder 3 are inserted into two pairs of holding holes 2 formed on both sides of the printed circuit board 1. The holder 3 is fixed to the printed circuit board 1 by subjecting the holder 4 to processing such as deformation with a jig or the like.

A liquid crystal 5, a light guide plate 6, and a zebra rubber connector 7 containing carbon are accommodated in the holder 3.
The light guide plate 6 is made of an elastic body, has a non-uniform dimple portion 8 formed on the back surface side, and has a support portion 9 protruding high so as to have the same height as the zebra rubber connector 7 on one side. A recess 10 is formed at two places on the lower surface of 9 in the illustrated example. The zebra rubber connector 7 is arranged on the opposite side of the support portion 9, and the liquid crystal 5 is
Is electrically connected to a driving driver 11 mounted on the back surface of the printed circuit board 1 and an electrode 12 provided on the printed circuit board 1. The liquid crystal 5 is stably held in the holder 3 by the support portion 9 of the light guide plate 6 made of an elastic body. The liquid crystal 5 is engaged with the inner peripheral portion of the liquid crystal lighting display window 13 of the holder 3 and detaches outward. Has been prevented.

A chip LED 14 is mounted on the printed circuit board 1 so as to project light substantially parallel to the surface of the printed circuit board 1, and the chip LED 14 is housed in the recess 10 of the light guide plate 6. An irregular reflection surface 15 is provided on the printed board 1 corresponding to the dimple portion 8 of the light guide plate 6, and the irregular reflection surface 15 is formed by white insulating printing. The inner surface of the holder 3 is configured to be white.

The operation of the above configuration will be described below. Light emitted from the chip LED 14 substantially in parallel with the surface of the printed circuit board 1 by turning on the power is applied to the inner surface of the concave portion 10 of the light guide plate 6, and the unevenly arranged dimple portions 8 and the irregular reflection surface of the printed circuit board 1. In cooperation with 15, the entire back surface of the liquid crystal 5 can be almost uniformly illuminated. At this time, since the irregular reflection surface 15 on the printed circuit board 1 is white as described above, the light from the chip LED 14 is efficiently irregularly reflected, and since the inner surface of the holder 3 is whitened, the irregularly reflected light is emitted. Can be reflected inside and the display state of the liquid crystal 5 can be clearly confirmed in darkness without leaking to the outside.

[0018]

As described above, according to the present invention, the light from the LED is almost uniformly illuminated on the entire back surface of the liquid crystal by the dimple portion formed on the light guide plate and the irregular reflection surface on the printed circuit board. Therefore, the number of assembly parts can be reduced. Therefore, the assembly workability can be improved, and the cost can be reduced.

Further, by electrically connecting the liquid crystal and the printed circuit board with a zebra rubber connector, the number of assembled parts can be further reduced. Therefore, the assembly workability can be further improved, and the cost can be reduced.

Further, the liquid crystal can be stably and reliably held by forming the light guide plate with an elastic body and holding the liquid crystal with respect to the holder.

Further, by forming the irregular reflection surface of the printed circuit board by white printing and whitening the inside of the holder,
The liquid crystal can be efficiently illuminated from the back surface, and the liquid crystal display state can be sharpened.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a liquid crystal unit floodlight device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the liquid crystal unit floodlight device.

FIG. 3 is a partially cutaway perspective view showing a conventional liquid crystal unit light projecting device.

FIG. 4 is an exploded perspective view showing the liquid crystal unit light projecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 3 Holder 5 Liquid crystal 6 Light guide plate 7 Zebra rubber connector 8 Dimple part 14 Chip LED 15 Diffuse reflection surface

Continuation of the front page (56) References JP-A-6-123885 (JP, A) JP-A-2-142820 (JP, U) JP-A 62-84024 (JP, U) (58) Fields surveyed (Int .Cl. ⁷ , DB name) G02F 1/13357 G02F 1/1333 F21V 8/00 601 G02F 1/1345

Claims (3)

(57) [Claims] 1. A holder mounted on a printed circuit board and holding liquid crystal, an LED mounted on the printed circuit board and projecting light substantially parallel to the surface of the printed circuit board, and a diffuse reflection surface formed on the printed circuit board. , provided in the holder, and a light guide plate having a dimple portion in cooperation with the irregular reflection surface light guide the back surface of the liquid crystal is substantially uniformly illuminated from the LED, the light guide plate It is made of an elastic body, and the liquid crystal is
Liquid crystal unit light emitting device
Place. 2. The liquid crystal unit light emitting device according to claim 1, wherein the liquid crystal and the printed circuit board are electrically connected by a zebra rubber connector inside the holder. 3. The irregular reflection surface of the printed circuit board is formed by white printing.
Or the inside of the holder is white.
3. The liquid crystal unit projection device according to 2.