JPS5895280A - Electronic watch - Google Patents

Abstract

PURPOSE:To obtain a low-cost liquid crystal watch by insulating a coil winding core or a coil winding core and a york from a base plate. CONSTITUTION:A completed coil 24 consists of a coil winding core 14, a terminal board 15, a winding frame 17, and a coil 18. The coil 24 is incorporated into a york 13 by inserting a tube 12 into fixing holes 14c, 14d drilled into the winding core 14. Since an insulating part 16a is formed on the upper and lower surfaces of the core 14 at the fixing hole 14C side, the core 14 is insulated from other parts even if coupled with a screw 22. Namely the core 14 is insulated from a base plate 11 and reference voltage is not applied to the core 14, so that when the coil 18 is directly wound around a winding part 14e of the core 14, battery capacity is not reduced because current does not flow into a driving circuit differently from conventional methods.

Description

DETAILED DESCRIPTION OF THE INVENTION The 4X invention relates to the structure of an electronic timepiece, particularly a needle type quartz wristwatch having a converter consisting of a yoke and a coil.

Recently, with the spread of crystal watches, costs have been reduced. I
Call me very strong 1. It's coming.

I'It The needle-type crystal wristwatch of the Song Dynasty had a main plate V made of metal material.
For convenience, a converter consisting of 11 yokes and coils made of magnetic material is adopted, or the yoke is attached to the base plate, and one of the completed coils is usually implanted on the base plate. This is done by fixing the pipe to a pipe made of a metal material. Therefore, the yoke and the coil winding core are electrically connected to the ground plane.

On the other hand, since the reference potential (ground potential) of the battery, which is the drive power source, is electrically connected to the ground plane, the yoke, O/C, and coil winding cores are also at the same potential as the reference potential of the power source.

Next, looking at the structure of the cross-sectional view of the completed coil 7 shown in FIG. 1, the coil core 1 is made of a magnetic material.

It is fixed to a tube (not shown) planted in a base plate (not shown) via a yoke 2 made of a magnetic material using the fixing holes jc and id provided in the ends 1a and 1b. . Moreover, a terminal plate 6 made of an insulating material and having a wiring pattern 3a on the upper surface side is adhesively fixed on the end portion 1a of the coil core 1.

Reference numeral 4 denotes an insulating part made by coating the winding part 1e-) 1 of the coil winding core 1 with insulating tape or insulating paint, and 5 is a winding frame made of an insulating material.

The coil formed by the insulating part 4 and the winding frame 5 is called the core 1.
A coil 6 is wound on the winding portion 1e of the coil 6.
The terminal portion 6a is soldered to the wiring pattern 3a1.

The coil 6 and the winding part 1e of the coil winding core 1 are electrically insulated by the insulating part 4, but if the insulating tape forming the insulating part 4 is scratched or misaligned by one position, or if the insulation If there are cracks or flakes in the coating, the coil 1 becomes electrically connected to the winding part 1e of the coil winding core 1, so the circuit is as shown in Figure 2, which is a typical converter drive. In the circuit, a connection 7 is generated between the coil 6 and the reference potential vDo, resulting in a short circuit state.

Therefore, when drive pulses P1 and P2 are not applied, P
Channel type M'O8) transistor Tr and Tr are O
Although it is in FF state, N-channel type MO8) transistor T
Since r2 and Tr4 are in the ON state, the reference potential VDD
Since a current flows in the direction of the potential VB8 through the connection 7 and further through the transistor Tr4, the capacity of the battery serving as the power source decreases rapidly. Even if the transistors Tr2 and Tr3 are turned on, the converter will not operate at all because the power supply voltage has decreased. As mentioned above, when the reference potential VD of the power supply is applied to the coil core 1, if even a part of the insulation part 4 is destroyed and the coil 6 and the coil core 1 become conductive, the power supply is almost short-circuited. This has the fatal drawback that the battery capacity suddenly runs out and the clock stops immediately.

In addition, when using insulating tape to create the insulating section 4 on the coil winding core 1, it is important to be aware that the installation position may be misaligned and the cutter used to cut the insulating tape to match the width of the winding section 1e may cause damage. It is very difficult to prevent this, and since the work involves gluing the upper coil winding cores 1 one by one, the number of man-hours is extremely large.

On the other hand, in the case of coating with insulating paint, it is necessary to coat the entire circumference of the winding part 1e of the coil winding core 1, which causes uneven coating, and it is also difficult to control the position of the coating. It has disadvantages such as:

An object of the present invention is to provide a low-cost crystal wristwatch that eliminates the above drawbacks by insulating the coil core or the coil core and the yoke from the main plate, thereby making it possible to directly wind the coil around the coil core. It is about realization.

The present invention will be described in detail below based on the following. Figure 3 is a sectional view showing a first embodiment of the present invention.

FIG. 4 is an enlarged sectional view of the main part of FIG. 3.

In FIGS. 3 and 4, reference numeral 12 is made of a metal material and is implanted on the ground plate 11 to which the reference potential ■Do of a battery (not shown), which is a driving power source, is applied. A yoke 16 made of a magnetic material is press-fitted into the chi nib 12 to a position where it contacts the upper surface of the base plate 11.

24 is a completed coil, and the completed coil 24 is a coil winding core 1.
4. It is composed of a terminal plate 15, a winding frame 17, and a coil 18.

The coil winding core 14 is made of a magnetic material, and has an end portion 14a114.
In b, fixing holes 14c, 1 passing through the coil winding core 14 are provided.
4d has been created. The upper and lower surfaces of the coil core 14 around the inner circumference of the fixing hole j4c and the fixing hole 14e, and the inner circumference of the fixing hole 14d and the coil core 1 around the fixing hole 14d.
Thin insulating portions 16&, 16b made of an insulating material are formed on the lower surface of 4 by means such as printing.

A terminal plate 15 having a wiring pattern 15a on the upper surface side is adhesively fixed onto the end portion 11 of the coil winding core 14. The coil 18 is directly wound on the winding portion 14e of the coil winding core 14, which is regulated in the width direction by a winding frame 17 made of an insulating material.

Reference numeral 19 denotes a terminal portion of the coil 18, which is connected to the wiring pattern 15a of the terminal board 15 by a solder or the like.

Reference numeral 21 denotes a circuit board on which a circuit element (not shown) such as an IC is mounted, and has a wiring pattern 21a on the lower surface side, and comes into contact with the wiring pattern 15a of the terminal board 15 for electrical conduction.

The completed coil 24 has the fixing hole 14C11 of the coil winding core 14.
Yoke 1 by inserting tube 12 into 4d
6, the identification hole 14c 1t411 is assembled on the inner circumference of the fixing hole 14C and the identification hole 14C as described above.
Since insulating parts 16a are formed on the upper and lower surfaces of the coil winding core 14 around
2 and the screw 22 are not in direct contact with each other and are electrically insulated. On the other hand, on the fixing hole 14d side, an insulating part 16b is formed on the inner periphery of the fixing hole 14d and the lower surface of the coil core around the fixing hole 14d, and the upper surface side of the coil core 14 is connected to the terminal plate 15 and the circuit board 21. Since the coil winding core 14 is fastened with the screw 26 via the screw 26, even if it is fixed on the yoke 16 with the screw 26, the coil core 14 is electrically insulated from the +1-- wire 13, the tube 12, and the screw 23. .

Therefore, since the coil winding core 14 is insulated from the ground plate 11 and the reference potential vDD is not applied, the coil 18 is directly wound around the winding portion 14e of the coil winding core 14 as described above. Even if conduction occurs between the coil core 14 and the coil winding core 14,
No current flows through the drive circuit as in the conventional case, and the battery capacity does not decrease. Also, the insulating parts 16a, 1
6b need only be created by printing, etc., only on the peripheral area of the fixing hole 14C114d, and even if the thickness is uneven or there are some areas that are not printed, if there are printed areas around the area, insulation can be ensured. is sufficient and is not a problem at all.

Therefore, the production of the insulating parts 16a and 16b is easier than in the past in terms of quality, and therefore mass production is possible.

FIG. 5 is a partial sectional view showing a second embodiment of the present invention.

62 is a bushing made of insulating material, which is connected to the reference potential v of the power supply.
It is pressed and fixed to a base plate 61 made of a metal material to which DD is applied, and the upper end surface portion 32a protrudes from the upper surface of the base plate 61. Reference numeral 63 is a tube made of a metal material and is pushed and fixed into the inner circumferential hole 32b of the puno 7 unit 62.

34 is a yoke, and the lower surface of the yoke 64 is connected to the button 7-6.
The tube 36 is press-fitted to a position where it abuts the upper end surface portion 32a of the tube 36.

65 is a coil winding core, and like the yoke 34, it has a fixing hole 35a.
is fixed on the yoke 64 by inserting it into the tube 66 and tightening the screw 66.

Note that a fixing hole (not shown) provided at the other end of the coil winding core 35 is also fixed with a similar structure.

Therefore, both the yoke 34 and the coil winding core 65 are connected to the main plate 61.
Since the upper end surface portion 3211 is fixed on the bush 62 which protrudes from the upper surface of the bushing 62, it does not rise above the base plate 61 and come into contact with the base plate 61, and is electrically insulated from the base plate 61.

The tube 65 is also press-fitted into a bushing 62 made of an insulating material, so that it is insulated from the base plate 61.

The above structure has the same effects as those shown in FIGS. 3 and 4, and is also easy to process and assemble because it is only necessary to plant the bushing 32 of insulating material on the base plate 61.

Furthermore, it is clear that the same effect can be obtained even if the pusher 62 and the tube 65 are formed integrally with an insulating material such as synthetic ballast.

As described above, according to one aspect of the present invention, an insulating part is formed in the fixing hole of the coil winding core to insulate only the coil winding core, or a bushing made of an insulating material is planted on the base plate, and the yoke and the coil winding are By insulating the core from the ground plate, the drive circuit will not be short-circuited and the battery will run out of capacity when the coil and the coil winding core are electrically connected, unlike in the conventional case. In addition, since there is no need to use an insulating material to isolate between the winding part of the coil winding core and the coil, the structure of the completed coil is extremely simple, and the number of assembly steps can be greatly reduced, resulting in a low-cost slanted crystal wristwatch. It has the effect of being able to realize the following.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional completed coil, and FIG. 2 is a converter drive circuit diagram for explaining the conventional example. 3 and 4 are a cross-sectional view and an enlarged cross-sectional view of essential parts for explaining the first embodiment of the present invention, and FIG. 5 is a partial cross-sectional view showing the second embodiment of the present invention. 11.31... Main plate. 16.64... Yoke, 14.35... Coil winding core, 14-C114d... Fixing hole for coil winding core 14, 16d%16b...・Insulation section, 62... Bush, 12.66... Tube, 22.23.36... Screw. Figure 1 + e Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] In an electronic watch that has a converter composed of a base plate made of a metal material to which the reference potential of a power supply is applied, a yoke made of a magnetic material, and a coil winding core, the coil is directly wound on the coil winding core. An electronic timepiece characterized in that the yoke and the coil winding core or only the coil winding core are electrically insulated from the main plate together with the rotating case.