JPS62136685A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention can be applied to a liquid crystal display device used as a display device for electronic devices such as electronic typewriters and word processors. A perspective view from the top of the liquid crystal display device, No. 8
The figure is a perspective view from the back of FIG. 7, and FIG. 9 is a cross-sectional view of FIG. 7. Here, 1 is a liquid crystal panel, 2 is a rubber connector, 3 is a printed wiring board provided with a driving circuit for the liquid crystal panel, and 4 is a pressure fitting, which is inserted into the engagement hole 3a of the printed wiring board 3. By bending the engaging piece 4a as shown in FIG. 8, the rubber connector 2 is held between the liquid crystal panel 1 and the printed wiring board 3.

Problems to be Solved by the Invention However, in the conventional liquid crystal display device configured as described above, in order to press and clamp the rubber connector, the retaining piece of the pressure connector must be bent using a jig or the like after assembly. This work was necessary. Furthermore, during assembly, it is necessary to position the liquid crystal panel and printed wiring board in order to accurately connect the terminals of the liquid crystal panel and the corresponding terminals of the printed wiring board with rubber connectors, but conventional liquid crystal display devices Since the above-mentioned positioning mechanism was not provided, a positioning jig was required. In this way, conventional liquid crystal display devices require many man-hours to assemble, as the engagement piece of the pressure fitting has to be bent and a jig for positioning the liquid crystal panel and the printed wiring board is required. There was also the problem that the cost of the jig was high.

Means for Solving the Problems In order to solve the above problems, the liquid crystal display device of the present invention has a liquid crystal unit main body made of synthetic resin instead of a pressure fitting, and the liquid crystal unit main body has a liquid crystal panel. A guide for storing and arranging the liquid crystal unit in a predetermined position, an elastic piece that presses against the side surface of the liquid crystal panel, and a positioning hole or notch provided in the printed wiring board that is inserted to position the liquid crystal unit and the printed wiring board. A locating pin is provided for the purpose. In addition, the LCD unit body has a contact part that comes into contact with the surface of the LCD panel and receives the compressive load of the rubber connector, and a contact part that engages with the engagement hole provided on the printed wiring board and resists the compressive load of the rubber connector. A locking piece is provided for holding the wiring board.

Function The liquid crystal display device of the present invention configured as described above has the following features:
In addition, the liquid crystal panel is positioned at a predetermined position on the liquid crystal unit body by the guide provided on the liquid crystal unit body and the pressure-contact elastic piece, and is fixed so that it does not move easily. The liquid crystal unit main body and the printed wiring board are positioned by the positioning pin provided in the liquid crystal unit and the positioning hole or notch provided in the printed wiring board. In this way, by positioning and assembling the liquid crystal unit main body and the liquid crystal panel, and the liquid crystal unit main body and the printed wiring board, respectively, the liquid crystal panel and the printed wiring board can be reliably positioned without using a jig. Second, the locking piece provided on the liquid crystal unit body utilizes the elasticity of synthetic resin to lock and hold the printed wiring board simply by inserting it into the engagement hole of the printed wiring board. The assembly of the liquid crystal display device is completed simply by inserting the locking piece of the liquid crystal unit main body incorporating the liquid crystal panel and rubber connector into the engagement hole. Figure 2 shows an electronic typewriter using an embodiment of the present invention.
In the perspective view showing the external appearance, 5 is a liquid crystal display window, and the liquid crystal panel display section is configured to be visible from the outside.

FIG. 3 is a perspective view of an embodiment of the liquid crystal display device of the present invention.
Reference numeral 6 denotes a liquid crystal display main body, 7 a liquid crystal panel, and 8 a printed wiring board provided with a drive circuit for the liquid crystal panel.

FIG. 4 is a perspective view showing the back side of FIG. 3, where 6a is a locking piece provided on the liquid crystal unit main body 6, and 6b is a liquid crystal display panel)
The positioning pin 8a provided on the main body indicates a retaining hole provided on the printed wiring board 8.

Figure 1 is an exploded view of this liquid crystal display device, where 9 is a rubber connector and 6C is a liquid crystal panel 7 provided on the liquid crystal unit body.
0 surface, 6d is a pressing elastic piece provided on the liquid crystal unit body, 6e and 6f are guides for the liquid crystal panel 7 provided on the liquid crystal unit body, 6θ is the longitudinal direction of the liquid crystal panel 7, and 6f is the It is perpendicular to that direction. 8b, 8
c is a positioning hole provided in the printed wiring board; 8b
is a hellhole, and 8C is a long escape hole.

Here, the distance L1 between the pressing elastic piece 6d of the liquid crystal unit main body 6 and the guide 6e is set to the length L2 of the liquid crystal panel 7 so that an appropriate elastic force is applied to the side surface of the liquid crystal panel 7 when the liquid crystal panel 7 is assembled. Therefore, by assembling the liquid crystal panel 7 into the liquid crystal unit main body along the guides ee and ef while bending the press-contact elastic pieces 6d, the liquid crystal unit main body 6 and the liquid crystal panel 7 can be separated. is positioned and fixed so that it does not move easily by the elastic force of the pressing elastic piece 6d. FIG. 5 shows a plan view of the liquid crystal panel 7 assembled into the liquid crystal unit main body 6. Next, the rubber connector 9 is assembled so that the conductor surface 9a of the rubber connector 9 comes into contact with the terminal surfaces 7a, 7a' of the liquid crystal panel. 6q is a rib provided on the liquid crystal unit body 6 to prevent the rubber connector 9 from shifting.

Then, the positioning pins 6b and 6b' provided on the liquid crystal unit body e are connected to the positioning holes 8c of the printed wiring board 8.
, 8b, the end 8aa of the engagement hole 8a of the printed wiring board 8 comes into contact with the slope 6aa of the locking piece 6a, and printing is performed while bending the locking piece 6a. When the wiring board 8 is assembled and the locking surface 6ab of the locking piece 6a passes through the engagement hole 8a, the locking piece 6a returns to its original position due to its elastic force, and the printed wiring board 8 is attached to the liquid crystal unit main body. 6 and the assembly is completed. FIG. 6 shows a sectional view of the locking piece 6a of the liquid crystal unit main body 6 in the completed state of this embodiment. Here, the distance L3 between the contact portion 6C of the liquid crystal unit main body 6 and the locking surface 6ab of the locking piece 6a is determined by the thickness of the terminal surface 7a of the liquid crystal panel 7 so as to apply an appropriate pressure contact force to the rubber connector 9. It is set to a value smaller than the sum of L4, the free height L5 of the rubber connector 9, and the board thickness L6 of the printed wiring board 8 (L4+L5+L6).

As described above, according to this embodiment, the liquid crystal unit main body 6 includes
LCD panel 7, rubber connector 9. Assembly is completed by simply assembling the printed wiring boards 8 one after the other, which greatly reduces the number of man-hours compared to the conventional method, and also improves yield because the positioning of the liquid crystal panel 7 and the printed wiring boards 8 can be performed with high precision.

In the above embodiment, the pressure-contact elastic piece of the liquid crystal unit main body is provided in the longitudinal direction of the liquid crystal panel.
Furthermore, by providing pressure-contact elastic pieces on the side surfaces perpendicular to this, it is possible to further improve the positioning and holding performance of the liquid crystal panel relative to the liquid crystal unit main body in the longitudinal direction and the perpendicular direction.

Moreover, it is also possible to improve the holding strength of the printed wiring board by changing some of the locking pieces to screws. In this case, the locking piece not only holds the parts of the printed wiring board that are not screwed, but also serves as a temporary fixing during screwing work, thereby making it possible to stabilize the work.

As described above in detail, in the liquid crystal display device of the present invention, the liquid crystal unit body and the liquid crystal panel can be positioned and held by the guide and press-contact elastic piece provided on the liquid crystal unit body, and the liquid crystal unit The printed wiring board and the liquid crystal unit main body can be positioned using the positioning pins provided on the main body and the positioning holes or notches provided on the printed wiring board, so you can simply assemble each part one by one without using a special positioning jig. , the terminals of the liquid crystal panel and the corresponding terminals of the printed wiring board can be accurately connected using rubber connectors. Furthermore, in order to hold the printed wiring board by locking the locking piece provided on the liquid crystal unit body into the engagement hole provided on the printed wiring board, it is necessary to bend a part of the pressure fitting as in the past. is not necessary, and the assembly can be completed by simply assembling each part in sequence. As described above, the present invention has the effect of reducing the number of man-hours and cost of jigs and tools in assembling a liquid crystal display device, and improving the yield rate, thereby contributing to reducing manufacturing costs and improving quality. .

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the liquid crystal display device of the present invention, Fig. 2 is an external view of an electronic typewriter using the same liquid crystal display device, and Fig. 3 is a perspective view of the same device. Fig. 4 is a perspective view of the device seen from the back, Fig. 5 is a plan view showing a state in which the liquid crystal panel is incorporated into the liquid crystal unit main body of the present invention, Fig. 6 is a sectional view of the device, and Fig. 7 is a cross-sectional view of the device. FIG. 8 is a perspective view of a conventional liquid crystal display device, FIG. 8 is a perspective view of FIG. 7 viewed from the back side, and FIG. 9 is a sectional view of a conventional liquid crystal display device. 7...LCD panel, 9...Rubber connector, 8...Printed wiring board, 6...LCD unit, body, 6a... Locking piece, 6b, 6b
'...Positioning pin, 6C...Abutment part, 6
d... Press-contact elastic piece, s e , ef...
・Guide, 8a...Engagement hole, 8b, 8c...
...Positioning hole. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 5 Figure 6

Claims (2)

[Claims] (1) A liquid crystal unit body made of synthetic resin is configured so that a liquid crystal panel, a printed wiring board with a liquid crystal drive circuit thereon, and a rubber connector connecting the two are attached to the liquid crystal unit body; a guide and abutting part for storing and arranging the parts, an elastic piece pressed against at least one side, a locking piece that locks into the engagement hole provided in the printed wiring board, and a positioning hole provided in the printed wiring board. or a positioning pin inserted into the notch so that the rubber connector is held at a predetermined position between the liquid crystal panel and the printed wiring board during installation. (2) The liquid crystal display device according to claim 1, wherein the pressure-contact elastic pieces of the liquid crystal unit main body are provided in pressure contact with two side surfaces of the liquid crystal panel.