JPS6247107Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for arranging an elastic conductive member of an alarm watch having a piezoelectric element.

As shown in FIG. 1, a conventional alarm clock has a piezoelectric element 1 attached to a back lid 2, and a buzzer signal generated from a circuit board 3 on which a clock circuit is mounted is conducted to the surface of the piezoelectric element 1 through a buzzer terminal 4. Furthermore, an alarm sound is generated by connecting the power supply of the circuit board 3 to the back cover 2 through the ground terminal 5. 6 is a circuit case for guiding the buzzer terminal 4, and 7 is a panel frame. In the case of such a structure, there was a risk that the conductive springs 4 and 5 would cause chattering during a fall impact. It is known that when chattering occurs during a drop impact, the high voltage generated in the piezoelectric element can adversely affect the watch IC. This negative effect can cause the clock to change its time, change its mode, or in the worst case, destroy the IC. As a solution to these problems, circuit countermeasures are often taken. For example,
It is known to add a diode to prevent the high voltage generated by the piezoelectric element from flowing into the IC, or to add a resistor to lower the high voltage. However, these measures have disadvantages such as lowering the alarm volume, increasing design space, and increasing costs.

The present invention eliminates such drawbacks, and its purpose is to provide a structure that prevents an alarm watch that uses a piezoelectric element to generate an alarm sound from chattering when dropped and impacted.

The present invention will be described in detail below based on examples.

FIG. 2 is a cross-sectional view showing one embodiment of the present invention, and numerals 1 to 7 are as explained in FIG. 1. Second
In the figure, compared to FIG. 1, a ground terminal 8 is provided to electrically connect the circuit board 3 and the outer shell 9. This ground terminal 8 is a conductive spring having the same potential as the ground terminal 5. This ground terminal 8
The circuit board 3 and the back lid 2 are electrically connected to each other via a metal outer shell 9 (the outer shell may be made of conductive or conductive treated plastic). Electrical conduction between the back cover 2 and the outer shell 9 is extremely reliable with a biting structure, a screw fixing structure, etc. With the structure shown in FIG. 2, if the watch body is dropped with the outer case 9 side down, chattering will easily occur between the ground terminal 5 and the back lid 2, but Reliable electrical continuity can be established between the In other words, a gap may occur between the ground terminal 5 and the back cover 2 due to the deflection of the circuit board 3 and the contraction of the ground terminals 5 and 8 themselves, but between the ground terminal 8, the circuit board 3, and the outer shell 9. Since they are securely connected and conductive, no chattering occurs. If the watch body is dropped with the back lid 2 side down, chattering will easily occur between the ground terminal 8 and the outer case 9, but the ground terminal 5 and the back lid 2
Reliable continuity can be established between the In other words, due to the deflection of the circuit board 3 and the contraction of the ground terminals 5 and 8 themselves, a gap may occur between the ground terminal 8 and the outer body 9;
Since it is securely in contact with the back cover 2 and electrical conduction is established, no chattering occurs. Even with the same conduction spring, the buzzer terminal 4 that is electrically connected to the piezoelectric element 1 is less likely to cause chattering than the ground terminal 5 that is electrically electrically connected to the back cover 2. This is Urabuta 2
This is because the piezoelectric element 1 is made of a SUS material with poor conductivity and has a rough inner surface, whereas the piezoelectric element 1 is soft and conductive with silver, which has good conductivity. In most cases, the problem caused by the chattering mentioned above is caused by the back cover 2.
This is caused by chattering between the ground terminal 5 and the ground terminal 5. Therefore, as shown in FIG. 2 of the present invention, a conduction spring 5 is provided which conducts the same potential from the circuit board 3 to both the front plane part (outer body 9 side) and the back plane part (back cover 2 side) of the timepiece movement. By installing 8 and 8, a clock with an alarm that prevents chattering and has excellent drop impact characteristics is completed.

The above explanation uses an example in which a piezoelectric element is attached to the back cover to create a diaphragm, but the back cover can also be used if another diaphragm is added between the watch movement and the back cover instead of the back cover. It can also be applied when attached to glass instead of a pig. Although a coil spring is used in the figure, an elastic conductive member such as a plate spring may also be used.

As described above, the present invention can prevent the chattering of the elastic conductive member around the piezoelectric element of an alarm watch with a piezoelectric element, thereby significantly improving drop impact characteristics and preventing time errors, mode skipping, IC damage, etc. A clock with an alarm that never wakes up is completed. In addition, since high voltage is no longer generated from the piezoelectric element to the IC, there is no need to add diodes, resistors, etc. This reduces design space, reduces costs, and there is no need to worry about the volume becoming low. It has excellent effects such as:

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional alarm clock. Second
The figure is a sectional view showing an embodiment of an alarm watch according to the present invention. 1...Piezoelectric element, 2...Back cover, 3...Circuit board, 4...Buzzer terminal, 5...Earth terminal, 6...
...Circuit case, 7...Panel frame, 8...Ground terminal, 9...Outer body.

Claims (1)

[Scope of utility model registration request] In an alarm timepiece that generates an alarm sound by electrically vibrating a first conductive timepiece component on which a piezoelectric element is attached, the first conductive timepiece component is a first conductive timepiece component on a circuit board on which a timepiece circuit is mounted. a second electrically conductive timepiece component on a side of the circuit board opposite the first side of the circuit board, the second electrically conductive timepiece component being in electrical conduction with the first conductive timepiece component; a first elastic conductive member that establishes electrical continuity between a first terminal of the circuit board and the piezoelectric element;
a second elastic conductive member that establishes electrical continuity between the terminal of the circuit board and the first conductive watch component; and a third terminal that has the same potential as the second terminal of the circuit board and the second conductive component. 1. A timepiece with an alarm, comprising: a third elastic conduction member that establishes electrical conduction with a component of the timepiece.