JPS5854716Y2 - Layout structure of LCD clock - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a liquid crystal watch that uses liquid crystal to display time and the like.

In liquid crystal watches that use liquid crystal to display time, etc., various connectors have been considered for connecting the liquid crystal cell, which is the liquid crystal display part, and the wiring pattern from the electronic circuit.
Recently, conductive rubber has been used because of its low cost, simple structure, and ease of handling.

However, in order to connect the liquid crystal cell and the conductive rubber, a proper connection cannot be obtained unless the conductive rubber is compressed, so the conductive rubber must be shaped to accommodate the compression, that is, the shape must be enlarged in the connection direction. As a result, the conductive rubber tends to tilt easily, resulting in poor assembly workability.

The present invention eliminates the above-mentioned drawbacks, provides a liquid crystal watch that has a structure that is easy to assemble without increasing the number of parts, and has a display that is unprecedented.

The present invention will be explained below based on the drawings.

Figure 1 is a plan view of the display section of the liquid crystal watch according to the present invention.
2 is a liquid crystal cell support frame, 2 is a liquid crystal cell holder, and 3 is a liquid crystal cell. Below the liquid crystal cell 3, there are arranged a spacer 4, a lower polarizing plate 5, a light guide plate 6, and a reflecting plate 7, which have almost the same shape as described below. ing.

8 is a conductive rubber connector that makes contact between the wiring pattern from the electronic circuit and the liquid crystal cell 3; 9 is a lamp for illumination; and 10 is a fixing screw.

In FIG. 1, the display in the black area is the display by the liquid crystal cell 3, and the hatched area is the print on the light guide plate 5, which will be described later, and indicates 12:58:30 on Tuesday morning.

Components 1-8 described above are shown in FIGS. 2A-9B.

FIG. 2A is a plan view of the liquid crystal cell holder 2, and FIG. 2B is a sectional view taken along the line II in FIG. 2A. (not shown) to fix the liquid crystal cell 3.

Note that the hole 2b engages with a tab on the liquid crystal cell support frame 1 to position the liquid crystal cell presser 2.

FIG. 3A is a plan view of the liquid crystal cell 3, and FIG. 3B is a plan view of the liquid crystal cell 3.
, in which a field-effect nematic liquid crystal (not shown) is sealed between an upper glass 3a and a lower glass 3b having different shapes.

7 segments that display numbers written in thin lines, AM,
Letters such as PM, colons, etc. are connected to the external electrode 3C in contact with the conductive rubber 8 to display a predetermined time and the like.

Note that 3d is an upper polarizing plate, which is attached to the upper glass 3a with an adhesive.

FIG. 4A is a plan view of the spacer 4, and FIG. 4B is a side view of the spacer 4, in which a ring-shaped thin metal plate is bent to give it springiness and create a gap between the liquid crystal cell 3 and the lower polarizing plate 5. In addition, the lower polarizing plate 5 is pressed onto the light guide plate 6 to prevent interference fringes.

The protrusion 4a is used for positioning when it is assembled into the liquid crystal cell support frame 1.

FIG. 5 is a plan view showing the lower polarizing plate 5. FIG.

FIG. 6 is a plan view showing the light guide plate 6, which is made of resin such as acrylic and serves to illuminate the entire display surface by emitting light from the side.

The light guide plate 6 has 5UN-5AT (7) day of the week 6a, the above-mentioned [1
A cutout 6d is printed (hatched portion) on the horizontal bars 6b and 6C provided above and below the date 6a and on the outer periphery.

Reference numeral 6e denotes a side surface portion in the longitudinal direction of the light guide plate 6, and the thickness of the side surface portion 6e is larger than the thickness of any of the spacer 4, the lower polarizing plate 5, and the reflecting plate 7 arranged on the lower surface of the liquid crystal cell 3. Moreover, since the light guide plate 6 itself is an electrically insulating material, it is possible to prevent the conductive rubber 8 from falling down, which will be described later, in a mechanically and electrically stable manner.

FIG. 7 is a plan view showing the reflecting plate 7. FIG.

8A and 8B are a plan view and a sectional view of the conductive rubber 8, which has a rectangular shape in which conductive parts 8a and insulating parts 8b are alternately laminated.

When using conductive rubber as a connector, reliable continuity cannot be obtained unless a certain amount of pressure is applied, so the shape described above allows for the compression required to obtain this pressure, making it easier to compress. It's for a reason.

Note that the recessed portion 8C of the insulating portion 8b prevents connection between adjacent electrodes and further ensures continuity.

FIG. 9A is a plan view of the liquid crystal cell support frame 1, and FIG. 9B is a plan view of the liquid crystal cell support frame 1.
II-II sectional view of Figure A, two holes 1a made of resin such as Duracon and into which tubes (not shown) are inserted.
, four dowels 1b for positioning the liquid crystal cell holder 2,
Two notches 1C1 for positioning spacer 4
4 for positioning the lower polarizing plate 5, light guide plate 6, and reflection plate 7;
It is composed of two positioning parts, that is, convex parts 1d, two holes 1e into which the conductive rubber 8 is inserted, and an inner wall part 1f.

Furthermore, a hole 1e is formed in the liquid crystal cell support frame 1 as shown in FIG. 9B.
and an opening at a lateral position facing the side surface of the light guide plate 6 when the light guide plate 6 is placed in the liquid crystal cell support frame 1 (i.e., the wall portion of the hole 1e closer to the direction in which the light guide plate is located). A portion 1g is formed.

Also, as can be seen from the position of the light guide plate 6 indicated by the dotted line in FIG. The light guide plate 6 is in contact with the side wall of the convex portion 1d which is the formed positioning portion.
Planar positioning is performed.

FIG. 10 shows a clock board 11. FIG. 2 is a cross-sectional view of the movement to which a device cover 12, a battery 13, and a battery presser spring 14 are attached.

A tube 15 is attached to the device cover 12, and is fixed by a convex portion 15a of the tube 15 and a seat 16.

The tube 15 is inserted into the hole 1a of the liquid crystal cell support frame 1, and the liquid crystal cell holder 2 can be tightened with the screw 10.

From this, the liquid crystal cell 3, spacer 4, lower polarizing plate 5, light guide plate 6, and reflector plate 7 incorporated in the liquid crystal cell support frame 1
, the conductive rubber 8 is fixed, and the conductive rubber 8 is prevented from falling down by the side surface 6e of the light guide plate 6 and the inner wall 1f of the liquid crystal cell support frame 1 at a position facing the side surface 6e and the open portion 1g. A wiring pattern (not shown) from the electronic circuit 17 provided on the liquid crystal cell 3 and the watch board 11 using the conductive rubber 8 is inserted directly between the inner wall 1f located at the
There is electrical continuity with the

On the other hand, the battery 13 is fixed by screwing a battery pressing spring 14 to the tube 15 with a screw 17.

In the display section of the liquid crystal watch explained above, when conductive rubber is used to connect the liquid crystal cell and the wiring pattern, the conductive rubber has a shape that allows for compression to ensure a secure connection, so no countermeasures are taken. If this is not done, the conductive rubber will tend to tilt during the assembly process, but in this invention, the conductive rubber is supported on both sides of the inner wall of the liquid crystal cell support frame and the side surface of the light guide plate, so it is securely supported. In addition to preventing the conductive rubber from falling over, the light guide plate, which is pre-installed in a watch that illuminates the liquid crystal cell with a lamp, etc., can be used as one of the fall prevention members, without installing any new special parts. Since it is also used as a part, it has an extremely simple structure, which improves assembly workability, and eliminates the complicated work required in the past, such as inserting conductive rubber into the liquid crystal cell support frame and forming a deep hole to prevent it from falling. There is no need for a structure, and a simple structure that facilitates production of the injection mold for molding the liquid crystal cell support frame is achieved, resulting in cost reduction.

Furthermore, positioning using the liquid crystal cell support frame improves the accuracy of the relative mounting position between the light guide plate and the liquid crystal cell, and the side surface of the light guide plate partially enters the open area in a planar manner, which is different from the conventional method. The present invention eliminates the aesthetically undesirable situation in which the ends of the light guide plate become visible when viewed from the display surface side of the liquid crystal cell due to misalignment between the light guide plate and the liquid crystal cell.

Furthermore, because the distance (width) from the side surface of the light guide plate to the inner wall of the hole is maintained constant by positioning the liquid crystal cell support frame, a flat piece of the light guide plate can be To facilitate the insertion work of conductive rubber without shifting.

Also, in the opposite case, that is, after removing the liquid crystal cell and light guide plate, if you pull out the conductive rubber in the vertical direction and perform the removal operation, it is easy to remove the conductive rubber by tilting it diagonally toward the opening. Since it can be removed, disassembly work for maintenance, repair, etc. can be done quickly and easily.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a movement of a liquid crystal watch that is an embodiment of the present invention, Fig. 2 A is a plan view showing a liquid crystal cell holder, Fig. 2 B is a sectional view taken along the line I-■ in Fig. 2 A, Figure 3 A and B
are a plan view and a side view showing a liquid crystal cell, FIGS. 4A and B are a plan view and a side view showing a spacer, FIG. 5 is a plan view showing a lower polarizing plate, and FIG. 6 is a plan view showing a light guide plate. Fig. 7 is a plan view showing the reflector, Fig. 8 A and B are plan views and side views showing the conductive rubber, Fig. 9 A is a plan view showing the liquid crystal cell support frame, and Fig. 9 B is the plan view showing the conductive rubber. II-II sectional view of A, No. 10
The figure is a sectional view showing a movement of a liquid crystal watch that is an embodiment of the present invention. 1... Liquid crystal cell support frame, 3... Liquid crystal cell, 6... Light guide plate, 6e... Side part,
8... Conductive rubber, 9... Lamp, 17
...Electronic circuit.

Claims (1)

[Scope of utility model registration request] a liquid crystal cell support frame for positioning the liquid crystal cell; and a conductive rubber sandwiched between the liquid crystal cell and a watch substrate having the wiring pattern for establishing electrical continuity between the liquid crystal cell and the wiring pattern from the electric circuit. In the liquid crystal watch, the liquid crystal cell support frame accommodates the conductive rubber. a hole formed vertically through the hole for placement, a portion connected to the hole and opened at a lateral position facing the side surface of the light guide plate, and the opened portion and the liquid crystal with the hole formed therein. a positioning portion that is in contact with a side surface of the light guide plate in a cell support frame portion and performs planar positioning of the light guide plate;
The light guide plate is arranged within the liquid crystal cell support frame in a state where it is positioned in a plane by the positioning part, and an inner wall part of the hole and a side part of the light guide plate are located at a position facing the open part. An arrangement structure for a liquid crystal watch, characterized in that the conductive rubber is directly inserted between the layers.