JPS585391B2 - Denshiki Udedokei - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic wristwatch with a trimmer capacitor for capacitively correcting the frequency of a standard source.

An object of the present invention is to reduce the size of an electronic wristwatch and to make it easier to attach an additional mechanism that has been difficult to attach due to dimensional constraints.

Another object of the present invention is to reduce the cost of an electronic wristwatch using a trimmer capacitor.

In general, the standard oscillation circuit of an electronic wristwatch that uses a piezoelectric resonator, such as a crystal resonator, as its standard source is as shown in Figure 1, which includes a crystal resonator 1, a trimmer capacitor 2 for adjustment, a resistor 3, and a capacitor for temperature correction, etc. It consists of electronic components such as 4 and 5, an inverter 6 made into a MOS-IC, and a frequency dividing circuit.

Conventionally, a part of the planar structure when these electronic components are incorporated into a watch is shown in Fig. 2. A watch body substrate 9 made of resin has a resistor 10 formed by printing, baking, etc., an insulating substrate 12 made of zirconia, alumina, steatite, etc., on which a MOS-ICU is attached, and a trimmer capacitor 13, for example, temperature correction. The chip capacitors 14 used for this purpose were individually fixed by soldering, screwing, or the like.

However, in order to assemble each watch part individually like this,
A fixing stand must be installed for each part to fasten screws, etc., and a certain amount of space is naturally required between each mold part and the fixing stand. The area occupied by the watch body is extremely small, making it difficult to miniaturize the design of electronic wristwatches, and furthermore, it is difficult to attach additional mechanisms comparable to mechanical watches.

The present invention eliminates such drawbacks, and embodiments of the present invention will be described in detail below with reference to FIGS. 3 and 4.

In the present invention, first, a crystal resonator 17 is fixed to a watch body substrate 15 made of synthetic resin with a fixing spring 16 made of beryllium copper.

Next, holes for passing metal rivets 19 are made in the stator 18 made of a 6 x 16 x 0.5 m/m steatite plate, and then a trimmer capacitor bottom electrode 20 and a MOS-IC are attached to the surface of the stator 18. The mounting portions 21 and stator fixing terminals 22 and 23, which also serve as lead wires, are formed by baking at 80° C. with conductive gold paste.

Next, the stator fixed terminals 22 and 23 are attached to the stator 18, and then the metal rivets 19, which are made of gold-plated brass, have a dielectric constant of 300 to 350, an outer diameter of 4φXO, and 5m.
A rotor 24 mainly made of barium titanate of /m, the stator 18, and a fixed spring 2 that also serves as a phosphor bronze lead wire.
After passing through the metal rivet 19, the tip of the metal rivet 19 is bitten.

Thereafter, on the stator 18, a resistor 26 and a CMO8-IC are formed by printing and baking a palladium-silver material.
27 and wired with a wire bonder using gold wire, then connect the stator fixed terminals 22 and 23 and the fixed spring 25.
And the terminals of the temperature correction chip capacitor 28 were assembled into the watch board 15 by screwing.

As a result of prototyping an electronic wristwatch with this kind of structure, we were able to reduce the space between each watch component, especially the electronic components, compared to conventional ones, and the number of fixing bases on which each component was attached was also reduced. Furthermore, the number of man-hours required for soldering, screwing, etc. can be reduced.

In this way, the present invention greatly contributes to the miniaturization of electronic wristwatches having a trimmer capacitor and to lower costs by directly arranging other timepiece parts on the stator of the trimmer capacitor.

In addition, in the embodiment of the present invention, a resistor MO8 is provided on the stator.
-Although the structure in which the IC is disposed is shown, it goes without saying that chip capacitors and the like can also be attached regardless of the upper or lower surface of the stator.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a standard oscillation circuit for an electronic watch, in which 1 is a crystal oscillator, 2 is a trimmer capacitor, 3 is a resistor, 4 and 5 are capacitors, and 6 is an inverter. FIG. 2 is a schematic plan view showing a part of a conventional watch body, and FIGS. 3 and 4 are schematic views showing the structure according to the present invention.
and 25 are fixed springs, 8 and 17 are crystal oscillators, 9 and 15 are clock body boards, 10 and 26 are resistors, and 11 and 27 are MOS
-IC, 12 is an insulating substrate, 13 is a trimmer capacitor,
14 and 28 are chip capacitors, 18 is a stator, 19
is a metal rivet, 20 is the bottom electrode of the trimmer capacitor,
21 is a MOS-IC mounting portion, 22 and 23 are stator fixing terminals, and 24 is a rotor.

Claims (1)

[Claims] 1. In an electronic watch having a standard source made of a piezoelectric vibrator and a trimmer capacitor for correcting the frequency of the standard source with a capacitance, the stator of the trimmer capacitor is formed sufficiently larger than the rotor, and the stator is formed on the upper surface of the stator. The stator is mounted with an IC chip, a chip capacitor, etc. other than the rotor, and supports the stator by stretching a part of a fixing spring that engages with a metal rivet that passes through the stator and the rotor and fixing it to the board with screws. An electronic wristwatch characterized by: