JPH0351757Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a crystal unit fixing structure for a crystal watch.

[Prior art]

FIG. 1 shows an example of a structure for fixing a crystal unit of a quartz watch in which conventionally the crystal unit was pressed against an elastic part provided on a presser member for holding and fixing a circuit board and positioned on a watch base frame.

1 is the main plate which is the base frame of the clock, 2 is the crystal unit,
3 is a circuit board on which the crystal unit 2 is mounted; 4 is a holding member for holding and fixing the circuit board 3;
At the same time, it is a circuit holding plate that presses the crystal unit with its elastic portion to position and fix it on the base plate 1. 5 is a pattern wired within the circuit board 3. FIG. 2 is a cross section taken along line a-a' in FIG. 1.

In a conventional structure, the crystal unit diameter D and the height H1 of the crystal unit guide surface of the main plate 1 tend to be small values, and the height H2 of the circuit board guide surface of the main plate 1 leans to a large value due to parts processing. At this time, as shown in FIG. 3, the circuit board 3 is assembled into a sharp bend.

In addition, even if the above-mentioned value is the central dimension value due to parts processing, if some external pressure is applied to the watch while the user is carrying the watch in the market, it will cause damage, even if only temporarily. A situation like that shown in Figure 3 may occur. If the situation as shown in Fig. 3 occurs, the circuit board 3 may be bent, the pattern 5 may be peeled off, or the crystal unit 2 may be separated from the circuit board 3, causing the clock to stop and the time accuracy to deteriorate due to a large rate shift. This became a problem. The superiority or inferiority of time accuracy in a watch is directly connected to its product value, and the above-mentioned issues are extremely important.

〔the purpose〕

The present invention is intended to solve the above-mentioned problems, and its purpose is to prevent circuit problems such as folding of the circuit board 3 and to improve the reliability of the time accuracy of the clock. Our goal is to provide crystal clocks with excellent quality.

〔overview〕

The crystal unit fixing structure of the crystal watch of this invention is
It consists of a crystal unit placed on a base frame, a circuit board to which the terminal side of the crystal unit is fixed, and a presser member for holding and fixing the circuit board on the base frame, and the crystal unit is provided on the presser member. In the crystal unit fixing structure of a crystal watch, the crystal unit is positioned and fixed to the watch base frame by being pressed by an elastic part, and the crystal unit has a step or a slope formed on the guide surface of the base frame. The terminal side of the crystal unit is fixed at a height higher than the tail side thereof and close to the height of the circuit board guide surface of the base frame by the tilting means.

〔Example〕

The present invention will be described below based on examples. FIG. 4 shows an embodiment of the present invention.

The crystal unit guide surface of the main plate 1 includes a plug terminal side receiving surface H41 and a tail side receiving surface H42 of the crystal unit.
A step is provided in the guide surface, and the guide surface is formed so that the plug terminal side receiving surface H41 is closer to the circuit board guide height H2 of the main plate 1 than the tail side receiving surface H42. The crystal unit 2 is fixed to the base plate 1 by being pressed by the elastic part provided on the circuit holding plate 4, but since the base plate 1 has a stepped shape as described above, the crystal unit 2 is fixed to the base plate 1. Two points A and B on the main plate 1
The cross-sectional position is determined by , and it is necessarily fixed diagonally. By employing such a structure and fixing the crystal unit 2 obliquely, the circuit board 3 is given a gentle bend in advance. With this kind of structure, even if there are variations in parts processing or external pressure, the conventional example 3
As shown in the figure, there is little possibility that sudden bending will occur, and circuit defects such as bending of the circuit board 3, peeling of the pattern 5, and peeling of the crystal unit 2 and circuit board 3 have been improved, and the clock will not stop. , the fatal problem with the function of the clock, such as the large rate shift, is resolved.

Since the intention of the present invention is to cause the circuit board to be gently bent, the method of fixing the crystal unit 2 diagonally is not limited to this embodiment.
The same effect can be obtained if the crystal unit receiving surface of the main plate 1 is shaped diagonally as shown in the figure, if it is structured to receive it at one point as shown in Fig. 6, or if there is any other structure that allows the crystal unit 2 to be fixed diagonally. Of course you can get it.

〔effect〕

In order to make a watch thinner, the total thickness of the watch can be reduced by housing the crystal unit inside the base frame.

In that case, if the crystal unit is housed in the base frame, the terminals of the crystal unit will be located further down than the circuit board, and the circuit board will have to be bent when fixing the crystal unit and the circuit board.

In order to fix the circuit board so that it does not bend, the position of the circuit board and the position of the terminals of the crystal unit should be aligned with the horizontal plane, but a metal circuit holding plate is placed above the circuit board. Therefore, a patterned surface is formed on the lower side, on which electronic components such as chip capacitors are placed. Therefore, space is required for electronic components to be placed.
It is not possible to match the terminals of the crystal unit in the horizontal plane by avoiding the position of the circuit board.

Therefore, by tilting and arranging the crystal unit along the slope means such as a step or slope formed on the receiving surface of the base frame as in the present application, the terminals of the crystal unit and the circuit on the fixed side of the circuit board can be easily connected. The board can be fixed by gentle bending.

Furthermore, the present invention provides a structure in which the terminals of the crystal unit are placed close to the height of the circuit board by tilting and placing the crystal unit on the receiving surface of the crystal unit on the lower surface of the concave portion of the base frame using a slope means such as a step or a slope. Since the circuit board can be fixed by gently bending it, the crystal unit and the circuit board can be directly fixed without any special processing.

Furthermore, it does not cause damage to the crystal unit or adversely affect its properties.

Therefore, by providing a recess for housing the crystal unit in the base frame and placing the crystal unit,
The watch can be made thinner. Furthermore, sudden bending of the terminals of the crystal unit or the circuit board that occurs during assembly due to misalignment between the terminals of the crystal unit and the circuit board that occurs when the crystal unit is placed in the recessed part can also be avoided.
Since the crystal unit can be placed at an angle, this problem can be solved without special processing of the crystal unit and the circuit board.

Therefore, there is no damage to the crystal unit or adverse effects on its characteristics, and no excessive stress is applied to the circuit board, preventing bending of the circuit board, bending of the pattern, peeling of the pattern, and peeling of the crystal unit and circuit board. In addition to being able to provide watches with stable quality without the occurrence of circuit defects such as
This allows watches to be made thinner.

As described above, according to the present invention, the crystal unit is placed at an angle by the slope means such as the stepped portion or slope formed on the guide surface of the base frame, and the terminal side of the circuit board is held high so that the terminal of the circuit board is fixed. Since the terminals can be fixed to the circuit board close to the height of the surface to be attached, even if there are variations in component processing, the circuit board will not bend sharply, and the circuit board will not bend or bend.
Since it is possible to prevent circuit problems such as pattern 5 peeling, it is possible to eliminate fatal problems in the function of the clock, such as the clock not stopping or the rate shifting.
It is possible to provide the user with a highly reliable timepiece with high time accuracy.

[Brief explanation of drawings]

1 to 3 show an example of a conventional quartz crystal unit fixing structure of a quartz watch. FIG. 2 shows a cross section taken along line a-a' in FIG. FIGS. 4, 5, and 6 show an embodiment of the quartz crystal unit fixing structure of a quartz watch according to the present invention. 1...Main plate which is a clock base frame, 2...Crystal unit, 3...Circuit board, 4...Circuit holding plate which is a holding member.

Claims (1)

[Claims for Utility Model Registration] Consisting of a crystal unit placed on a base frame, a circuit board to which terminals of the crystal unit are directly fixed, and a holding member for holding and fixing the circuit board to the base frame, In the crystal unit fixing structure of a quartz watch, in which the crystal unit is positioned and fixed to the watch base frame by being pressed by an elastic member provided on the presser member, the presser member, the circuit board, and the base frame are The crystal units are sequentially stacked, and the base frame is provided with a recess in which the crystal unit is housed, and the crystal unit is arranged in a step or a slope formed on a lower receiving surface of the recess. By being tilted and placed by the means, the terminals of the crystal unit are placed higher than the tail side and at a height near the circuit board guide surface of the base frame, and the circuit board is gently bent. A crystal unit fixing structure for a crystal watch, characterized in that the crystal unit is fixed to a terminal of the crystal unit in a fixed state.