JPH0521118Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an alarm structure for small electronic equipment.

[Prior art and its problems] Conventionally, for example, the alarm structure of an electronic wristwatch was
At a preset time (alarm time), a predetermined electrical signal is applied to a piezoelectric element provided on the inner surface of the back cover of the watch case, thereby emitting an alarm sound. In such an alarm structure, when electrically connecting the circuit board housed inside the watch case and the piezoelectric element provided on the back cover, there is a method of connecting using a coil spring or a method of connecting the circuit board to the circuit board. There is a method of connecting using a leaf spring with one end soldered.

However, with the method using a coil spring, when the back cover is attached and the coil spring is placed between the piezoelectric element and the circuit board, the coil spring may buckle or otherwise deform, resulting in poor contact at the terminal. There are problems such as the product being raised, or being shot with other parts.

In addition, in the method using a leaf spring, only one end of the leaf spring is fixed to the circuit board, so if a leaf spring that is relatively soft and has a weak return force is used, the elastic return force will be weak, making it difficult to replace the battery etc. If you repeatedly remove the back cover like this, there is a problem that the leaf spring will no longer be able to reliably contact the piezoelectric element. Further, when a hard plate spring with a strong return force is used, the electrical connection is good, but there is a disadvantage that force is applied to the fixed part to the circuit board, causing damage to the fixed part.

[Purpose of the invention] This invention was made in consideration of the above-mentioned circumstances, and its purpose is to be able to connect the printed circuit board and the piezoelectric element reliably and well, and to achieve extremely reliable conduction. The purpose of the present invention is to provide an alarm structure for small electronic devices with high performance.

[Summary of the invention] In order to achieve the above-mentioned purpose, this invention fixes at least two parts of the connecting member to the electrode terminals of the printed circuit board, and has a bent part in the connecting member between these fixed parts. The printed circuit board and the piezoelectric element are electrically connected by making the piezoelectric element elastically come into contact with the piezoelectric element.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings.

Figures 1 to 3 show the structure of an electronic wristwatch,
1 in the figure is a watch case. The upper side of this watch case 1 includes a glass storage recess 1a and a key storage recess 1.
b are provided side by side, and a component storage section is provided inside, and a back cover mounting recess 1c is provided on the lower side. A watch glass 2 is attached to the glass storage recess 1a, and a keyboard 3 is attached to the key storage recess 1b. In addition, a printed circuit board 4 is placed directly below the internal parts storage area, and a liquid crystal display panel 5 is placed between the printed circuit board 4 and the watch glass 2. In addition, a battery storage area is provided. A battery (not shown) is housed within 1d. moreover,
A back cover 6 is attached to the back cover storage recess 1c with screws.

The printed circuit board 4 includes various electronic components such as a trimmer capacitor 4a, an LSI, and a crystal oscillator that constitute a watch circuit, and is attached to the lower surface of the watch case 1 with screws 4b. The liquid crystal display panel 5 displays information such as time, and is supported and electrically connected to the printed circuit board 4 via interconnectors 5a, 5a. The keyboard 3 is used to adjust the time, change modes, etc., and consists of a rubber sheet 7 and a contact sheet 8, and is used to adjust the time, change modes, change the date, etc.
It constitutes a type of switch. That is, as shown in FIG. 1, the adjustment switch 3a is located at the lower left side of the watch glass 2 and flashes the time in the correction mode, and the mode changeover switch 3b is located at the lower left side of the adjustment switch 3a. It is located at
The date switch 3c is located on the lower right side and changes the time display to the date display, and also carries the ``+1'' when adjusting the time.
is added. keyboard like this 3
The rubber sheet 7 is made of insulating rubber, and has three recesses 7a formed on its lower surface, and carbon printing is applied to prevent the conductive parts 7b from protruding downward into the recesses 7a. has been done. The contact sheet 8 is flexible, and has three switch patterns (not shown) formed on its upper surface, and one end of the contact sheet 8 has a through hole formed in the watch case 1 and the printed circuit board 4. It is guided through the hole 9 to the lower surface side of the printed circuit board 4.
In this case, the switch pattern faces each conductive part 7b of the rubber sheet 7 at a distance, so that when the rubber sheet 7 is pressed from above, the conductive part 7b comes into contact with the conductive part 7b and its electrodes. A terminal is provided on one end side of the contact sheet 8 and guided to the lower surface side of the printed circuit board 4. The contact sheet 8 is pressed against the printed circuit board 4 by the elastic pressing portion 10a of the electrode plate 10, and the electrode terminal is electrically connected to a connecting terminal formed on the lower surface of the printed circuit board 4. In this case, the contact sheet 8 guided to the lower surface side of the printed circuit board 4 is formed on the lower surface inside the watch case 1 and
a positioning boss 1e projecting downward through the positioning boss 1e;
It is positioned by 1e.

The electrode plate 10 connects one electrode (positive electrode, +) of the battery arranged in the battery storage part 1d to the electrode terminal 4c of the printed circuit board 4, and is made of a thin stainless steel plate and has an elastic pressing part 10a and , battery contact section 10b, and substrate contact section 10c.
and a battery holding part 10d are all integrally provided. The elastic pressing section 10a elastically presses the contact sheet 8 against the printed circuit board 4,
It is formed into a comb-teeth shape, each of which is a contact sheet 8.
It has a leaf spring that corresponds to the electrode terminal. The battery contact portion 10b is shaped like a leaf spring and comes into elastic contact with the side surface (+) of the battery placed in the battery storage portion 1d, and extends into the battery storage portion 1d. The board contact portion 10c comes into contact with an electrode terminal 4c formed on the lower surface of the printed circuit board 4, and is provided in parallel with the elastic pressing portion 10a.
The battery holding part 10d elastically presses the bottom surface of the battery to prevent it from falling out, and has a tongue-like shape.
It extends below the battery storage section 1d. Also,
The electrode plate 10 has positioning holes 10f at predetermined locations.
and a mounting hole 10g are formed, and by fitting a positioning boss 1f formed on the lower surface inside the watch case 1 into this positioning hole 10f, the electrode plate 10 is positioned.
The electrode plate 10 is attached to the lower surface of the printed circuit board 4 by screwing screws 11 through the printed circuit board 4 and the watch case 1.
The other electrode (negative electrode -) of the battery is connected to the printed circuit board 4 through another electrode plate 10h, as shown in FIG.

On the other hand, the alarm mechanism generates an alarm sound at a preset alarm time.
The piezoelectric element 13 provided on the inner surface of the piezoelectric element 13 is electrically connected to the printed circuit board 4, and a predetermined pulse voltage is applied to the piezoelectric element 13 at a set alarm time. That is, the printed circuit board 4
As shown in Figure 2, there is an electrode terminal 4 on its bottom surface.
d and 4d are formed, and through holes 4e and 4e are formed in these electrode terminals 4d and 4d, respectively, passing through the printed circuit board 4,
A connecting member 12 is attached to the through holes 4e, 4e. This connecting member 12 is made of a wire material such as a stainless steel wire, and has electrode terminals 4d at both ends.
It is inserted into the through holes 4e, 4d from below and fixed with solders 14, 14, and the fixed portion has a bent portion 12a and has elasticity. In this case, the soldering parts 14, 14 at both ends of the connecting member 12 are elastically bent almost at right angles, so that the bent part 12a at the tip comes into elastic contact with the piezoelectric element 13 of the back cover 6. It's summery. The piezoelectric element 13 vibrates and generates an alarm sound when a predetermined pulse voltage is applied from the printed circuit board 4, and is made of a piezo element or the like.
It is electrically connected to the printed circuit board 4 via this connecting member 12 .

However, according to the alarm structure of the electronic wristwatch configured as described above, both ends of the connecting member 12 are fixed, and the bent portion 12a is provided between the fixed portions to provide elasticity. 12
Since a is brought into elastic contact with the piezoelectric element 13, the printed circuit board 4 and the piezoelectric element 13 can be connected reliably and well, and an extremely reliable conduction can be obtained. In particular, since the connecting member 12 is fixed to the printed circuit board 4 at two locations, it has sufficient elasticity and is also excellent in durability.

In addition, in the electronic wristwatch described above, one end side of the contact sheet 8 of the keyboard 3 is guided to the lower side of the printed circuit board 4, and this guided portion of the contact sheet 8 is directly connected to the electrode terminals of the printed circuit board 4. The contact sheet 8
can be easily and well connected to the printed circuit board 4. In addition, the elastic pressing portions 10a are formed in a comb-teeth shape, each of which serves as a leaf spring corresponding to the electrode terminals of the contact sheet 8, so that the contact sheet 8 and each electrode terminal of the printed circuit board 4 are reliably connected. It is possible to obtain a device with extremely high conductivity reliability.

Further, the electrode plate 10 includes an elastic pressing portion 10a that presses down the contact sheet 8, and a battery contact portion 1 that supplies the battery power supply voltage to the printed circuit board 4.
0b, board contact part 10c, and especially the battery holding part 10d, etc., so the number of parts can be significantly reduced, simplifying assembly work, improving workability, and reducing costs. It is possible to reduce the In this case, the electrode plate 10
Since it can be manufactured extremely simply and easily by press working, it is possible to provide an even cheaper product.

In the above-mentioned embodiment, a stainless steel wire was used as the connecting member 12, but the invention is not limited to this, and an elongated stainless steel strip may be provided as described above, or a simply elongated metal plate may be used. Alternatively, it may be bent into a dogleg shape and its both ends fixed to the printed circuit board 4.

Furthermore, in the above embodiment, the piezoelectric element 13 is fixed to the back cover 6 to vibrate, but the piezoelectric element 13 may be fixed to the watch glass 2, or it may be provided separately from the watch glass 2 and the back cover 6. The piezoelectric element may be fixed using a diaphragm. Further, in the above embodiments, a wristwatch has been described, but the present invention can also be applied to a clock, a card-type clock, a small electronic calculator, a card calculator, etc.

[Effects of the invention] As explained above, the structure of this invention is extremely simple as it only uses the wire by bending it.
Since both ends of the bent wire are fixed to the printed circuit board, it is possible to obtain sufficient elastic force compared to a case where only one end is fixed. Since it is fixed at certain points, the force applied to the fixed part is dispersed, which has the advantage of preventing damage to the fixed part.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which Fig. 1 is a plan view of the external appearance of an electronic wristwatch, Fig. 2 is a bottom view with the back cover removed, and Fig. 3 is a sectional view taken along line A-A. 1...Watch case, 4...Printed circuit board,
4d...electrode terminal, 6...back cover, 12...connecting member, 12a...bending portion, 13...piezoelectric element.

Claims (1)

[Scope of Claim for Utility Model Registration] An equipment case; a printed circuit board having alarm electrode terminals disposed within the equipment case; and an alarm piezoelectric element member provided within the equipment case; It is fixed to the alarm electrode terminal of the printed circuit board, and the central part between the fixed parts is bent to form a bent part, and this bent part elastically contacts the alarm piezoelectric element member to An alarm structure for a small electronic device, comprising: a connection elastic wire member that electrically connects an alarm electrode terminal and the alarm piezoelectric element member;