JPH0631723B2 - How to assemble a watch machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for assembling a timepiece mechanical body in which a battery contact piece and a circuit unit are connected.

(Prior Art) In a conventional watch mechanical body, a battery contact piece and a predetermined circuit pattern of a circuit unit are connected to each other by providing a groove on the battery contact piece and sandwiching the circuit unit in the groove to form a circuit pattern on a substrate. The first method of elastic contact, the second method of bending the battery contact piece to provide the spring portion and press-fitting it into the groove provided on the watch case to elastically contact the circuit pattern, or the third method of soldering both Method.

(Problems to be Solved by the Invention) In the first method in the above-mentioned conventional technique, the contact of the circuit unit substrate may be shaved and the contact may become unstable, and the precision of the parts on the contact piece side is required. In the second method, there is a possibility that the spring portion may be oxidized to impair the reliability of conduction. Further, due to creep or the like, the pressing force of the spring portion may become insufficient with the passage of time and the contact may become unstable. For this reason, there is a structure in which the screws are tightened in order to maintain the contact force, but in this case, there is a drawback that the number of parts is reduced. Further, in the third method, the reliability and stability of conduction are high, but when soldering is performed before the upper case is connected to the lower case during the assembly process of the timepiece mechanical body, other members are not touched. Thus, the soldering work required precision. Therefore, it is difficult to automate the work. In addition, since it takes time for the solder to solidify, there is a problem that the assembly time becomes long. On the other hand, if the battery contact piece and the circuit unit are integrated by soldering in advance, there is a problem that the integrated member is complicated to handle and the assembly into the timepiece mechanical body is troublesome.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method of assembling a timepiece mechanical body that can automate and speed up the process of connecting a battery contact piece and a circuit unit, and at the same time, can perform highly reliable connection.

(Means for Solving the Problems) A method for assembling a timepiece mechanical body according to the present invention includes a lower plate on which a component group consisting of a battery contact piece, a lead frame type circuit unit, and a timepiece train wheel is incorporated. , The hollow cylindrical shape in which the connection part of the battery contact piece is arranged so as to overlap with the predetermined conductor piece of the circuit unit, and then the lower plate is covered with the upper plate, and the upper plate and the lower plate are formed to project respectively. The connecting part and the overlapping part of the conductor piece are sandwiched between the two parts, and the electrode rod for spot welding is inserted from the hole formed in each of the tubular parts, and the connecting part of the battery contact piece is inserted through the electrode bar. And spot welding of the conductor piece and the conductor piece.

(Operation) According to the method for assembling the timepiece mechanical body according to the present invention, when the lower plate is covered with the upper plate in a state where the connecting portion of the battery contact piece and the predetermined conductor piece of the circuit unit are superposed, The connecting portion and the overlapping portion of the conductor piece are sandwiched by the tubular portion provided on the plate. Therefore, the electrode rods are inserted through the holes formed in both the tubular portions and spot welding is performed, so that electrical and mechanical connection is instantaneously and reliably performed.

(Example) Hereinafter, an assembly method of a timepiece mechanical body according to the present invention will be described with reference to the drawings.

First, on the lower plate 2, a component group including a battery contact piece 6, a lead frame type circuit unit 4 (third shown in the figure), and a timepiece train wheel 3 is incorporated. A cylindrical portion 2b is formed at a predetermined position of the lower plate 2 so as to stand up inward, and a hole 2a is formed so as to penetrate the center of the cylindrical portion. Although not shown in detail, the clock train 3 includes gears such as an hour hand wheel and a minute hand wheel and an intermediate plate.

The circuit unit 4 is attached to a coil bobbin 7 of a drive coil (not shown), and is connected with circuit elements such as an integrated circuit 8 and a crystal oscillator 9. For more information,
As shown in FIG. 3, a rectangular main lead piece 4 forming an outer frame.
c and a plurality of separation lead pieces 4d formed separately from the main lead piece 4c, an integrated circuit 8 is mounted in the center of the main lead piece 4c, and the integrated circuit 8 and the separation lead piece 4d are mounted. And are wire bonded. In this state, the insulating potting resin 12 is dripped so as to cover the respective end portions of the main lead piece 4c and the separation lead piece 4d and then cured, so that the main lead piece 4c and the separation lead piece 4 are separated.
The d and d are integrated by the potting resin 12 for protecting the integrated circuit to form the circuit unit 4. Further, the main lead piece 4c of the circuit unit 4 is formed with a contact portion 4a arranged at one end of the battery housing portion 5 of the lower plate 2.
Further, a part of the separation lead piece 4d is bent so that the conductor piece 4b is bent.
Are formed.

The battery contact piece 6 is formed with a contact portion 6a arranged at the other end of the battery housing portion 5. In addition, a part of the battery contact piece 6 is bent and extended to form a connecting portion 6b.

When assembling the circuit unit 4 and the battery contact piece 6 on the lower plate 2, the conductor piece 4b and the connecting portion 6b are overlapped,
It is placed at a position facing the tubular portion 2b.

Next, the lower plate 2 is covered with the upper plate 1 to connect them. On the upper plate 1, a tubular portion 1b is provided upright at a position facing the tubular portion 2b when connected to the lower plate 2. And the tubular portion 1b
A hole 1a facing the hole 2a is formed in the center of the hole. With such a configuration, when the lower plate 2 and the upper plate 1 are connected, the contact portion between the conductor piece 4b and the connecting portion 6b is sandwiched between the tubular portions 1b and 2b. That is, the tubular portions 1b and 2b face the conductor piece 4b via the connecting portion 6b. Therefore, the conductor piece 4b and the connecting portion 6b are connected to the holes 1a, 2
The conductor piece 4 is exposed to the outside through a.
In parts other than b and the connecting portion 6b, the circuit unit 4 and the battery contact piece 6 are covered with the upper plate 1 and the lower plate 2.

Further, the component group other than the circuit unit 4 and the battery contact piece 6 is also held by the upper plate 1 and the lower plate 2.

Finally, the electrode rods 10 and 11 are inserted through the holes 1a and 2a, and the conductor piece 4b and the connecting portion 6b are spot welded (second).
(Shown). By performing spot welding, reliable joining can be instantaneously performed, and the circuit unit 4 and the battery contact piece 6 are stably connected.

According to the assembling method of the present invention as described above, the circuit unit 4 and the battery contact piece 6 can be surely connected quickly, and the assembling time can be shortened. Further, since the connection can be made only by inserting the electrode rod after connecting the upper plate 1 and the lower plate 2, there is no fear of affecting other parts and automation can be achieved. Furthermore, since the tubular portions 1b and 2b shut off the welded portions (the conductor pieces 4b and the connecting portions 6b) from the inside of the timepiece machine body, the welding gas generated at the time of welding causes the position of components such as a group of components inside the timepiece machine body. Will not invade. Therefore, it does not affect other parts at the time of welding, contributes to the stabilization of quality, and is also excellent in dustproofness after assembly.

(Effect) As described above, according to the method of assembling the timepiece mechanical body according to the present invention, the battery contact piece and the circuit unit are connected by connecting the upper plate and the lower plate to each other and connecting the battery contact piece to the circuit unit. Since spot welding is performed in a state where the conductor pieces are superposed and held, the connection position is accurate and the assembly can be speeded up. Furthermore, since there is no fear of affecting other members during spot welding and the work does not require precision, automation is possible. Moreover, since the spot welding ensures reliable joining, the reliability of the connection is improved.

[Brief description of drawings]

The drawings are for explaining the assembling method according to the present invention. FIG. 1 is a partially cutaway plan view of a watch mechanical body, and FIG. 2 is FIG. 1 II.
-II line enlarged sectional view, FIG. 3 is an enlarged front view of the circuit unit. 1 ... Upper plate, 1a ... Hole part, 1b ... Cylindrical part, 2 ... Lower plate, 2a ... Hole part, 2b ... Cylindrical part, 3 ... Component group, 4 ... Circuit unit , 4b ... conductor piece, 6 ... battery contact piece, 6b ... connection part, 10, 11 ... electrode rod.

Continuation of the front page (56) References JP-A-51-98644 (JP, A) JP-A-58-106486 (JP, A) JP-A-54-98971 (JP, A) Actual development-Sho 55-52867 (JP , U)

Claims (1)

[Claims] 1. A lower plate is assembled with a component group consisting of a battery contact piece, a lead frame type circuit unit, and a timepiece train, wherein a connecting portion of the battery contact piece is a predetermined conductor of the circuit unit. Arranged to overlap with the piece, then cover the lower plate with an upper plate, between the tubular parts formed to project respectively on the upper plate and the lower plate, between the connecting part and the conductor piece. Inserting an electrode rod for spot welding from the hole formed in each of the cylindrical portions by sandwiching the polymerized portion, and connecting the connecting portion of the battery contact piece and the conductor piece via the electrode rod. A method of assembling a watch mechanical body, which is characterized by spot welding.