JPS6015034B2 - Battery holding structure for electronic watches, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for holding a power battery in a small electronic device such as an electronic wristwatch.

Conventionally, in order to hold a power supply battery in an electronic wristwatch, for example, the first structure is to fix the battery to the watch module using a leaf spring, a spring, etc., and hold the battery while applying a predetermined contact pressure to ensure continuity. In step 2, the battery is pressed against the module by a leaf spring installed on the inner surface of the back cover of the watch case or the inner surface of the battery hatch cover provided on the back cover to secure and hold the battery. A structure was implemented in which the back cover or hatch cover is considered a rigid body. Therefore, the factors that determine the thickness of a watch include the thickness of the essential part of the module, the height of the battery protruding from the module, and the wall thickness of the case. In addition to the thickness, a gap is added to prevent interference between the module provided on the outside and the case, and in the second conventional example, the thickness of the battery presser spring and the amount of allowance for its sag are added, so the thickness of the wristwatch is increased. could not be made small enough. In the present invention, the above-mentioned drawbacks are solved by using a new battery holding structure,
The purpose is to make 4-inch electronic devices such as watches as thin as possible.

This will be explained below with reference to the drawings. Figure 1 shows an example of an electronic wristwatch to which both the conventional battery holding structure and the present invention can be applied, in which 1 is the case 8, 2 is a window for displaying the time or the time to set the sound, and the inside of the window is in the state where the sound is set. The letter A and the set time 1:00 are displayed.

3 is a button switch for changing the display to either the time system or the set time by ringing, 4 is a time display correction switch, 5 is a ringing time setting switch, 6 is a front protection plate that also serves as a separation between the displays, and 7 is provided on this. It is a sound emitting hole.

Figure 2 is a sectional view taken along line A-A to show the internal structure of the example shown in the previous figure (the battery holding structure is the same as the first subordinate example), and 8 is a front waterproof section. The ring 9 is a dark red windshield glass to which a driving piezoelectric element 10 is attached so as to double as a vibrating plate.

11 is a ring-shaped spacer; 12 is a circuit board having a single-layer or multi-layer wiring pattern made of a glass-filled epoxy printed board, a ceramic board, a metal plate with surface insulation, etc.; , integrated circuit 14
, an LED light emitting display element 16 molded with transparent or colored resin 15, a battery 17, a battery holding spring 18, a diaphragm contact spring 19, and other electronic components are mounted.

There is also a case where there is not just one board, but a combination of multiple boards on which different parts are mounted. 20 is a ○ ring for waterproofing the back, 21
is Urabta.

In this example, the number of laminated elements is reduced by serving both as a diaphragm and a windshield, and the diaphragm is placed on the front side of the watch together with the display device, so that the sound is radiated to the front, making it possible to use a watch like a conventional watch. Since there is no need for a gap passage to guide and release sound emitted from the back to the side, the total thickness of the watch can be reduced, and since the sound does not bypass the watch, it has the advantage of being louder. Figure 3 is a longitudinal cross-sectional view showing another internal structure of the watch shown in Figure 1 (the structure of the second conventional example is used for battery retention), and the numbers of the parts that are almost common to the previous example are Corresponds to the previous figure.

In this embodiment, the sound emitting hole 7 is provided in a windshield glass 9 made of injection molded resin, the display part has a window 25, and the metal resonance plate 23, which also serves as a display parting plate, is located on a protrusion of the windshield glass. 2
It is glued to 4. The protrusion 24 has at least the sound emitting hole 7
It surrounds the group and is kept waterproof here. 22 is a glass hole.

In order to supply a power supply voltage of 3V to drive the LED, two 1.
It has a 5V silver battery 17. Further, these are pressed upward by the back cover 21 to stabilize the substrate 12. In this example, the sounding part and the display part are on the front and have almost the same thickness, so the thickness of the watch can be felt. FIG. 4 is a sectional view of one embodiment in which the battery holding structure of the present invention is applied to the timepiece shown in FIG. There is no sound emitting hole in the windshield 9, and sound can be heard indirectly through the windshield. However, it is more preferable to have a contact portion 32 for transmitting sound from the diaphragm 23 to the glass 9. The front packing 8 keeps the windshield 9 airtight and at the same time press-fixes the diaphragm 23 to the stepped portion of the case body 1. Reference numeral 17 is a lithium battery that can provide a sufficient driving voltage with just one battery.

The attenuation 21 is given elasticity in the thickness direction by a thin wall portion 27 formed with, for example, a D-circular wave pattern or scattered with uneven portions, which presses the battery 17 upward, and The board is held stably within the case. The battery retaining spring is omitted, and there is no gap between the movement and the case back, making the watch even thinner. 28 is a decorative ring.

As described above, in the present invention, the back cover is made relatively thin in the thickness direction and has a cross-sectional shape that is easily flexible, so that the pressing force necessary for holding and conducting the battery is obtained without using other holding spring members. Since it is configured so that an appropriate amount of is given by the Urabishi itself, not only wristwatches but also small electronic devices that can have the same battery holding structure as watches can be made as thin as possible by eliminating the factor of unnecessary increase in thickness. It is.

[Brief explanation of the drawing]

Figure 1 is a plan view of an example of a small electronic device, Figures 2 and 3 are
The figure is a sectional view showing a conventional example, and FIG. 4 is a sectional view showing one embodiment of the present invention. 1... Case body, 3, 4, 5... Operation button switch, 6... Front protection plate, 7...
...Sound emitting hole, 9...Windshield glass, 10...
...Piezoelectric element, 12...Circuit board, 15...LE
D element, 16...Mold part, 17...Battery, 21
...Hair lid, 23...Vibration plate, 27...
... Wavy molded part of the back cover, 31...Switch guide part, 32...Contact part. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 The back cover, which forms part of the case, is provided with a section having a substantially concentric wave-shaped cross section to provide flexibility in the thickness direction,
In addition, a flat power supply battery is arranged near the center of the waveform on the back cover side of the module, and when the back cover is assembled to the body of the case, the battery directly contacts the back cover, causing the back cover to close to the center of the waveform. 1. A battery holding structure for an electronic watch or the like, characterized in that the battery is deformed outward, and the elastic restoring force accompanying the deformation presses and holds the battery at a predetermined pressure.