JPS584794B2 - lcd display watch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display wristwatch, and particularly to improving the mounting structure of the liquid crystal display.

Figures 1 and 2 are an exploded perspective view and an assembled sectional view showing a conventional mounting structure.

The base plate 1 and the ceramic substrate 2 are fixed by inserting a column 3 having a screw hole into a through hole 4 and fastening screws (not shown) from below the ceramic substrate 2, and a housing 5 is bored in the center of the base plate 1. Ceramic substrate 2 through opening 6
I'm trying to place it on top.

The housing 5 is used to insert and support a connector 7 formed by laminating a large number of conductive rubber and insulating rubber alternately into a through hole 8, and the conductive rubber portion supports a liquid crystal display 9 mounted on the housing 5. When placed, it corresponds to each electrode pattern of the ceramic substrate 2 and the liquid crystal display 9.

The holding tool 10 is attached to cover the upper surface of the liquid crystal display 9, and a screw 12 (see FIG. 2) is fastened from above to the pillar 11 having the other screw hole of the base plate 1. It is fixed by this.

In the figure, 13 is an electrode pattern for the liquid crystal display 9 formed on the ceramic substrate 2, and 14 is an LSI (Large Scale Integrated Circuit) package mounted on the ceramic substrate 2, which corresponds to the LSI package 14. An opening 15 is formed in the center of the bottom of the housing 5 to allow the protrusion to escape.

By the way, when the base plate 1, the ceramic substrate 2, and the housing 5 are each separated as described above, the installation error becomes gradually larger, and the electrode pattern 13 on the ceramic substrate 2 and the liquid crystal display 9 This causes a misalignment between the electrode patterns (not shown) on the lower surface, and accordingly causes poor connection between the electrodes.

In addition, the main plate 1 is generally the center of the internal structure of the watch, and in order to facilitate the drilling of the opening 6 for passing the housing 5 through, to facilitate the installation of the housing 5, and to minimize the installation error of the housing 5. Metal plates are used that have high mechanical strength and can be constructed with thin walls.

Therefore, if the ceramic substrate 2 is attached to the base plate 1,
Another drawback is that other printed wiring etc. formed on the ceramic substrate 2 are short-circuited by the metal base plate 1, and an insulating structure must be formed on at least the contact portion of the base plate 1.

Furthermore, in order to enable this type of liquid crystal display wristwatch to read the display in a dark place, it has been proposed that a lamp 16 be provided as shown in the sectional view of FIG.

However, if the three parts are separate bodies and a metal plate is used for the base plate 1, the configuration can only be as shown in FIG. However, if the base plate 1 and the presser 10 are made of metal plates, short circuits may occur.

The present invention eliminates the various drawbacks of the above-mentioned conventional examples and provides a more advantageous mounting structure for a liquid crystal display.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7.

Figure 4 is an exploded perspective view showing the mounting structure of the liquid crystal display;
The figure is an assembled sectional view, FIG. 6 is a perspective view showing the main parts of FIG. 5, and FIG. 7 is a sectional view when assembled as a timepiece.

Components with the same reference numerals as those in FIGS. 1 to 3 have the same functions, so a description thereof will be omitted.

The base plate 21 is integrally constructed of an insulating synthetic resin and a housing part 22 corresponding to the conventional housing 5, and when installing the ceramic substrate 2, the pillars 23 having screw holes on the ceramic substrate 2 are inserted into the through holes 24. Positioning is performed by

The function of the housing part 22 is similar to that of the conventional housing 5, and it supports the connector 7 by inserting it into the through hole 25, and supports the LSI.
The protrusion of the package 14 is released.

The presser 10 is fixed to the base plate 21 together with the ceramic substrate 2 by fastening screws 26 to the pillars 23 inserted into the through holes 24 of the base plate 21.

A protrusion 27 formed protruding from a part of the periphery of the main plate 21 is integrally formed with synthetic resin at the same time as the main plate 21 is constructed, and is positioned in a notch 29 of the middle body 28 to position the internal structure and prevent rotation. do.

This notch 29 is formed based on another notch 31 in which the crown 30 is positioned, as is clear from FIGS. 6 and 7.

When assembling the watch, the main plate 21 is placed on the stepped portion 32 on the inner surface of the middle case 28, and a back cover (not shown) is fastened to the watch side 33.The main plate 21 is tightened with the middle case 28, and the internal structure of the watch is fixed. It is fixed on the side 33.

Note that the notch 34 formed in the ceramic substrate 2 allows the protrusion 27 of the base plate 21 to escape and is positioned in the notch 29 of the middle body 28.

In this way, the base plate 21 is integrally molded with the housing part 22 from an insulating synthetic resin, and there is no installation error that occurs when the housing 5 is installed in the conventional manner, and the electrode pattern 13 of the ceramic substrate 2 and the liquid crystal display board 9 In addition to preventing poor contact between the electrode patterns, the insulating properties of the synthetic resin can be utilized, making it unnecessary to form an insulating structure for the base plate as in the past.

In this case, although the base plate is made of synthetic resin, the housing portion 22 is integrally formed, so that a sufficiently large mechanical strength can be obtained as the base plate.

Furthermore, if the housing part 22 is integrally molded with side walls formed on all sides so that the liquid crystal display board 9 can be buried therein as shown in the figure, the mechanical strength of the base plate can be further increased, and the liquid crystal display board 9 This has the advantage that positioning can be easily performed and misalignment with the electrode pattern 13 of the ceramic substrate 2 can be eliminated.

Furthermore, in this case, there is no need to consider the drilling of an opening through which the housing 5 passes, ease of mounting the housing 5, mounting errors, etc., as in the conventional case, so the main plate 21 may be formed with a thick wall. It is also possible to further increase the mechanical strength.

Of course, it is more convenient to use a hard synthetic resin for this integral molding.

FIG. 8 shows an assembled sectional view when the lamp 16 is provided.

In FIG. 8, a recess 35 is formed in the base plate 21 at a corresponding portion of the lamp 16, leaving an appropriate resin thickness between it and the presser 10, and the lamp 16 is electrically connected within this recess 35. ing.

In this case as well, the base plate 21 is made of insulating synthetic resin, so the electrical connection of the lamp 16 will not be short-circuited, and the base plate 21 cannot be disconnected from the presser 10 because the synthetic resin of the base plate 21 is interposed therebetween. It will not be short-circuited even by

In FIG. 8, the electrical connection of the lamp 16 is made using a film-like connector 37 with wiring patterns 36 formed on both sides, as shown in FIG.
is used, and is fixed and electrically connected by fastening a screw 39 to a threaded metal column 38 on the ceramic substrate 2.

If such a film-like connector 37 is used, the lead wire 17 of the lamp 16 will be connected to the wiring pattern 3 of the connector 37.
Since the lead wires 17 are simply soldered to each other, short circuits between the lead wires 17 can be prevented, which is very convenient.

The above has described the advantages of the insulating properties of the base plate 21, but from another point of view, it can be said that since it is made of synthetic resin, the recesses 35 for attaching lamps, etc. can be easily formed.

In other words, even if the structure is complex and requires high precision for use in other applications, the main plate 21
It also has the advantage that it can be easily formed when configuring.

The aforementioned protrusion 27 for positioning and preventing rotation of the internal structure is another good example of this advantage.

Furthermore, in terms of the number of component parts, by integrating the base plate 21 and the housing part 22, the number of component parts is reduced and the assembly process is simplified, so it is possible to have the advantage of improving production efficiency.

As described above, according to the present invention, it is possible to eliminate the various drawbacks of the conventional art and provide a more useful and beneficial mounting structure for a liquid crystal display.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a conventional example, Fig. 2 is an assembled sectional view of Fig. 1, Fig. 3 is an assembled sectional view of main parts showing another persimmon example, and Fig. 4 is an example of the present invention. Exploded perspective view showing the case, No. 5
The figure is an assembled sectional view of FIG. 4, FIG. 6 is a perspective view of the main parts added in FIG. 5, and FIG. , FIG. 8 is a cross-sectional view of the main parts showing another example of the present invention, FIG.
9 is a plan view and a front view of the main parts of FIG. 8. FIG. 2...Ceramic substrate, 7...Connector, 9...Liquid crystal display board, 13...Electrode pattern, 21...: Ground plate, 22 ...Housing section.

Claims (1)

[Scope of Claims] 1. A liquid crystal display having a circuit board or the like on which electronic components are mounted and electrodes facing the electrodes of the liquid crystal display, and which positions the four sides of the liquid crystal display. The liquid crystal display is housed in the liquid crystal display, and a through hole for inserting a conductive rubber connector for electrically connecting the circuit board and the liquid crystal display, and a relief part for electronic components of the circuit board are formed; interposed between the liquid crystal display and the circuit board,
A liquid crystal display wristwatch characterized by comprising a housing made of insulating synthetic resin and integrally molded with a base plate.