JPH0334597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for manufacturing an analog display type portable electronic watch.

(Prior art) The movement of an analog display type portable electronic watch can be roughly divided into the main plate, stator, coil block,
It consists of parts such as a crystal unit, a circuit block, a rotor, a group of gears for rotation transmission, and a gear train support.While the stator and coil block are integrally fixed on the main plate, they are arranged on the other half of the main plate. The movement was constructed through an assembly procedure in which a group of gears was supported by a gear train support, and a circuit block was then mounted on top of these gears. Therefore, conventional devices not only require a large amount of man-hours from manufacturing each part to assembling them, but also require a lot of manpower.
There was a problem that it was impossible to make the products uniform.

In particular, when assembling the rotor that constitutes a step motor, the rotor magnet is magnetized, so it is attracted to the inside of the rotor hole of the stator, and it must be left still in the correct position. Moreover, when the rotor comes into contact with the rotor hole of the stator, the upper tenon position of the rotor shifts, making it impossible to assemble the train wheel bridge.

(Problems to be Solved by the Invention) The present invention has been made in view of the above problem, and its purpose is to provide a new analog system that allows the installation of rotors, gear train bridges, etc., with great accuracy and ease. The purpose of this invention is to propose a method for manufacturing a display type portable electronic watch.

(Means for Solving the Problems) That is, the present invention provides a method for manufacturing an analog display type portable electronic timepiece to achieve the above-mentioned problems. By magnetizing and then demagnetizing all of them, only the rotor is magnetized after assembly.

(Example) Examples of the present invention will be described below based on FIGS. 2 to 6. Note that the reference numerals given in FIG. 1 indicate the order of each step, and will be applied mutatis mutandis in the following description.

FIG. 2 shows the main part of the process for manufacturing a movement of a calendar timepiece based on the method of the present invention.

Photo etching processing and press processing are possible.
In addition, a long or short material 100 made of an elastic and conductive thin plate, preferably a stainless steel plate, which can partially be used as a switch spring, is prepared as a carrier for molding and mounting a circuit block, and is used for process feeding. Guide holes 101 are formed at required pitch intervals by press working, and a semicircular circuit lead board 10 is formed by photo etching.
2, and at the same time bond the integrated circuit 120 onto this lead plate.
3, and a lead piece 10 that connects to the terminal of the battery 200.
4 is formed by half etching, and lead piece 1 is formed by half etching.
04 further performs a bending process (step ~).

After that, nickel plating was applied to the entire surface of this material 100, gold plating was applied to the finger portion 103, and this material 100 was cut to an appropriate length from the viewpoint of management such as line balance in post-processing and correction of defective products. After that, the bump portion of the integrated circuit 120 is bonded to the finger portion 103 with gold or solder, and the top thereof is sealed with a silicone resin 121 (step ~).

Next, the entire circuit lead board 102 is coated with a resin 10 having good self-lubricating properties such as polyacetal resin.
6 (Fig. 3 B) to form the base plate 107,
At this time, an L-shaped stator 130 having a winding part 131 and a rotor hole 132 is inserted into the resin 106, and the winding part 131 is placed in a predetermined position on the main plate 107 so that it protrudes from one side of the circuit lead plate 102. Fix it in position. Also, during this forming, the base plate 107
On the top are the guide recess 108 of the crystal unit 140, the mortise hole 109 of the gear train, and the coupling pin 11 of the yoke 150.
While forming the coil frame 133 and the winding part 131 of the stator 130, an insulating film 134 is applied to the coil frame 133 and the winding part 131 of the stator 130. By rotating the arm of the winding machine inserted into the stator 130
A coil wire 135 is wound around a winding portion 131 of
The end thereof is welded to a predetermined pattern of the circuit lead plate 102 connected to the integrated circuit 120 (Step XII).

Next, a yoke 150 is stacked on top of the stator 130 and joined at both ends sandwiching the rotor hole 132 to form a closed magnetic circuit, and is fixed by heat caulking with the pin 110.
The crystal unit 140 is assembled into the circuit board 8 and fixed by heat caulking (FIG. 3C), and its leads 141 are welded to a predetermined pattern on the circuit lead board 102.
At the same time, a switch pattern 125 for rate adjustment is formed at a required position on the base plate 107 to be in contact with the logical speed/speed circuit of the integrated circuit 120 (steps ~).

Then, the terminals that were connected during processing of the circuit lead board 102 are cut to form an electrically completed circuit block, and the electrical characteristics are inspected and the rate is adjusted to complete the main board 107 (step).

The base plate 107 configured as described above has
Next, a second wheel & pinion 161, an unmagnetized rotor 165 made of ferromagnetic material configured to rotate integrally with the rotor pinion, a fifth wheel & pinion 162, and a wheel & pinion 16.
3. A wheel train is assembled in the order of the hour wheel 164, and the tenon at the other end of these train wheels is pivotally supported by a train wheel receiver 170 fixed on the base plate 107 by heat caulking (Steps to XI) .

By the way, this gear train bridge 170 is formed into a disk shape from a resin with good self-lubricating properties such as polyacetal resin, and as is clear from the enlarged view of FIG. A date wheel tooth tip guide wall 171 and a date wheel pin 172 are integrally provided on a part of the upper surface, and a date jumper 17 that swings around a fulcrum pin 173 is provided near the periphery of the upper surface.
4 are integrally formed via a connecting portion 175 that is cut after assembly. Therefore, the main plate 10
7, and then fit the date wheel 181 into the date wheel pin 172 so as to mesh with the hour wheel 164, and then move the date wheel 182 using the date wheel tooth tip guide wall 171 as a guide. , and then attach the date wheel presser 190 to the gear train holder 170 from above.
The movement is completed by caulking with the upper pin 177.

In addition, since the date jumper 174 is formed to be removed from the rotation area of the date dial 182 by the connecting portion 175 at the stage of assembling the date dial 182, it is necessary to remove the connecting portion 175 after the date dial 182 is assembled. If cut, the jumper 174 will connect to the circuit lead board 1.
02 is biased by a spring 176 provided in a part of the date dial 182 (step ~
).

Finally, by applying a strong magnetic field to the movement on the material 100 completed in this way and demagnetizing it,
Since only the rotor 165 made of ferromagnetic material is magnetized, all steps are completed by separating the completed movement from the material 100 and installing the battery 200 (steps ~).

The movement constructed as above is
As shown in FIG. 6, all the components are mounted on the base plate 107 constituting the circuit block, and the base plate 107 is made of a thin plate material 100 that is substantially easy to mold. The main plate 107 is made of a resin 106 having a core material, and members such as bearings and pins are integrally formed during molding of the base plate 107 and the like, thereby significantly reducing the number of parts.

Although the above explanation relates to a method for manufacturing a movement of a calendar watch, the present invention is not limited to such a manufacturing method. For example, when manufacturing a general watch that does not have a calendar mechanism, the above-mentioned Some of the steps can be omitted.

(Effects) As explained above, according to the present invention, the unmagnetized rotor made of ferromagnetic material is assembled to the board together with other watch parts, and then the whole is magnetized and then demagnetized. When assembling the rotor to the circuit board, it is possible to avoid adhesion of the magnetic material to other magnetic materials, such as the rotor hole of the stator, which greatly reduces the assembling work of the rotor and gear train support. In addition to making it easier, it is possible to prevent quality deterioration caused by unnecessary contact with other objects.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an example of the movement manufacturing process based on the method of the present invention, FIG. 2 is an explanatory diagram showing the main parts of the movement manufacturing process for a calendar watch, and FIGS. FIG. 4 is an enlarged sectional view showing each main part, FIG. 4 is an enlarged plan view showing the molding state at the stage of step (XI), and FIG.
The enlarged plan view of the gear train bridge and FIGS. 6A to 6D are cross-sectional views of various parts of the movement constructed by the method of the present invention. 100...Material, 102...Circuit lead board, 106
...resin, 107...base plate, 120...integrated circuit, 12
5... Rate adjustment switch pattern, 130... Stator, 140... Crystal unit, 150... Yoke, 1
65... Rotor, 170... Gear train support, 182... Date indicator, 190... Date indicator holder, 200... Battery.

Claims (1)

[Claims] 1. A step of assembling an unmagnetized rotor made of a ferromagnetic material into a substrate together with the constituent parts of a watch body; and assembling and fixing a support member that supports the rotor and a wheel train including the rotor onto the substrate. A method for manufacturing an analog display type portable electronic watch, comprising the steps of: magnetizing and demagnetizing all members including the rotor incorporated in the substrate together with the substrate.