JPS6217747Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has both a hand movement display section equipped with a pointer device driven by an electromechanical converter such as a step motor, and a digital display section consisting of an electro-optical display device such as a liquid crystal display cell. The present invention relates to the structure of an electronic watch having the following features.

An electronic watch movement that displays time and other information only on the digital display is mainly composed of an electronic circuit system and a display block, and the fixing and electrical connections between the electronic circuit system and display block are
Generally, this is achieved by inserting conductive rubber between the electrodes of the electronic circuit system and display block and fixing them with several screws. In this case, various countermeasures have been proposed and implemented to address problems such as impact resistance, and some solutions have been achieved. On the other hand, in the case of an electronic timepiece that has both a hand movement display section and a digital display section, the hand movement display section and the digital display section are arranged in different spaces in a plane. Therefore, in order to combine the two display sections to form a single movement, it is necessary to electrically connect and mechanically fix the electronic circuit system, the hand movement display section, and the digital display section. Regarding electrical connections, the electronic circuit system will be shared, and this can be solved by connecting an electromechanical converter such as a step motor for driving the hand movement display section and a digital display block to the drive terminals of the electronic circuit system. However, in terms of mechanical fixing strength, the bonding strength of the electrical connection itself is insufficient. As the circuit board used to configure the electronic circuit system, glass epoxy boards of 0.4 mm or less are usually used to make the movement thinner, and in terms of strength, compared to metal plates such as brass, It becomes quite weak. Weak mechanical strength causes trouble in terms of impact resistance, resulting in poor reliability. In order to improve the impact resistance, a highly rigid metal plate is used and the block for the hand movement display section and the block for the digital display section are attached to the metal plate. Here, the main plate used for the block of the hand movement display section is made of a metal plate such as brass, so by enlarging the main plate, an electro-optical display cell can be mounted on the main plate, and the display If the cell support member is configured to be fixed to the base plate, there is no need to provide a separate metal plate. However, in this case, although the impact resistance improves,
Due to the structure of the movement, the main plate is inserted between the electronic circuit system and the electro-optical display cell, and the thickness of the movement increases by the thickness of the main plate, which loses the advantage of thinning the watch in terms of design. Something will happen.

The purpose of the present invention is to improve the above-mentioned drawbacks in an electronic timepiece equipped with both a hand movement display section and a digital display section, in which a notch is provided in a part of the main plate constituting the hand movement display section. An electro-optical display cell, which forms the center of the digital display section, is disposed inside the base plate, and a digital display cell is disposed in the periphery of the notch of the base plate, such as a peninsular protrusion left when forming the notch. The purpose of the present invention is to provide a structure of a thin electronic timepiece with high impact resistance and excellent design by providing a fixing part for the display part and fixing the base plate and the digital display part.

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a plan view schematically showing the structure of an electronic timepiece according to an embodiment of the present invention. At the top of FIG. 1, a hand movement display section consisting of a dial 1, an hour hand 2, a minute hand 3, and a drive device 4 is arranged.

The drive device 4 includes an electromechanical converter (not shown) such as a step motor, a wheel train (not shown) driven by the converter, a base plate 5 supporting the wheel train, and the like. On the other hand, at the bottom of Figure 1,
A digital display section 6 is disposed, and in this area, the base plate 5 is formed with a notch 5c such that peninsular protrusions 5a and 5b remain, and a liquid crystal display cell 17 is formed in the notch 5c. is installed.
Digital display section 6 and peninsular protrusions 5a, 5 on the main plate
b is fixed by screws 7 and 8, and as a result,
The pointer display section and the digital display section 6 are integrated to form one movement. That is, FIG. 2 is a detailed cross-sectional view taken along the line AA in FIG. 1, and tap tubes 9 and 10 are planted and fixed in the peninsular projections 5a and 5b, respectively. A liquid crystal cell support frame 11 is attached to one of the surfaces of the base plate 5 parallel to the time display surface, and is fixed with screws 7 and 8.
Further, on the other side of the main plate 5, there are also tubes 9, 10 and a circuit board 12, which is a base for configuring an electronic circuit system.
It is attached to and fixed with screws 13 and 14. In the notch 5c between the cell support frame 11 and the circuit board 12, a liquid crystal display cell 17 to which polarizing plates 15 and 16 are attached, connection rubbers 18 and 19, and a reflection plate 20 are arranged. LCD display cell 1
7 is the liquid crystal cell support frame 1 for the side and top surfaces.
1, and on the lower surface side, portions where lead electrodes 17a, 17b of the liquid crystal display cell are formed are supported by connecting rubbers 18, 19. Further, the connecting rubbers 18 and 19 are supported in the formation areas of the drive terminal electrode parts 12a and 12b of the circuit board,
Further, the electrical connection between the circuit board 12 and the liquid crystal display cell 17 is achieved by using conductive rubber as the material of the connecting rubber and giving it a certain degree of deflection.

In such an arrangement structure, if the material of the base plate 5 is made of metal such as brass, the strength against impact can be sufficiently guaranteed, and the tubes 9 and 10 planted on the base plate 5 can be secured with high strength, Furthermore, high positional accuracy can be obtained, and positional deviation between the hand movement display section and the digital display section 6 can be reduced. In addition, the peninsular protrusion 5a of the main plate,
By arranging the liquid crystal display cell 17 in the notch 5c formed between 5b, it is possible to avoid overlapping with the base plate 5 except for the fixed part of the digital display 6.
This allows the movement to be made thinner.

As described above, according to the present invention, a digital display consisting of a hand movement display unit provided in a pointer device driven by an electromechanical converter such as a step motor, and an electro-optical display device such as a liquid crystal display cell is provided. In an electronic watch having both a part and a hand movement display part, a part of the base plate constituting the hand movement display part is cut out, and the main parts such as the liquid crystal display cell of the digital display part are disposed in the cutout part, and By fixing the fixing part of the digital display part to the peninsula-like protrusion of the main plate formed by the main plate, the electronic watch movement has a thin design with high impact resistance and less misalignment of both display parts. I was able to realize this.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of an electronic timepiece according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1. 1: Dial, 2: Hour hand, 3: Minute hand, 4:
. . . drive device, 5... base plate, 5a, 5b... peninsula-shaped protrusions, 5c... notch, 6... digital display section, 9, 10... tubes, 11... liquid crystal cell support frame, 12... circuit board, 17... liquid crystal display cell.

Claims (1)

[Scope of utility model registration request] A hand movement display section consisting of a wheel train driven by an electromechanical converter such as a step motor, a pointer driven by the wheel train, an electro-optical display cell such as a liquid crystal display cell, and the cell. In an electronic timepiece having both a digital display section constituted by a supporting member, etc., a notch is provided in a part of the main plate configured to support the wheel train of the hand movement display section, and the notch is An electro-optical display cell of the digital display section is disposed in the base plate, and a circuit board is disposed on one side of the base plate so as to cover at least the notch in a two-dimensional manner, and the cell is disposed on the other side of the base plate. supporting members are respectively disposed, the circuit board and the cell are connected by a conductive elastic member at least a portion of which is located in the cutout, and the presence of the cutout allows the circuit board and the cell to be connected to the base plate. A structure of an electronic timepiece, characterized in that a supporting member of the cell and a part of the circuit are fixed to two peninsula-like protrusions.