JPS6120796Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the electrical connection structure between the winding terminal of a driving coil and a circuit board used in a hand-type electronic timepiece.

An object of the present invention is to provide the above-mentioned connection structure with high reliability of the connection portion at low cost.

FIGS. 1, 2, and 3 show cross sections of conventional coil terminal connection structures. The coil 1 is composed of a winding core 2, a winding 3, and a winding frame 4, and an end 3a of the winding 3 is soldered to a pattern 5a on a coil terminal plate 5 attached to one end of the winding core 2. Although not shown, the circuit board 6 includes an IC chip, a crystal resonator,
Electronic components such as capacitors are mounted, and the coil 1 is configured to supply a pulsed current to be passed through the coil 1. Generally, for reasons such as ease of handling, after-sales service, and yield of each component, the circuit board 6 and the coil 1 are separated from each other, and are electrically connected by easy coupling means such as screw tightening. It is configured as follows.

FIG. 1 shows a pattern 5a of a coil terminal plate 5 attached to a lower surface pattern 6b and a coil winding core 2 using a double-sided pattern board with through holes as a circuit board.
These are electrically connected by tightening the circuit board fixing screws 7. The circuit board set screws 7 electrically connect the circuit board 6 and the coil terminal plate 5, and at the same time, magnetically connect the coil winding core 2 and the yoke 9. 11 is a tube planted in the base plate 10.

This example has a through hole 6c and a double-sided pattern.
Because it uses 6a and 6b circuit boards, compared to single-sided pattern circuit boards without through holes,
The board cost is more than tripled, which is a big disadvantage in terms of cost. Figure 2 shows a coil terminal plate 5 using a double-sided pattern sheet with through holes 5c.
Similar to the conventional example shown in FIG. 1, the cost of the coil terminal board 5 is disadvantageous compared to a single-sided pattern, and it is necessary to provide the coil set screw 8 separately from the circuit board set screw 7, which only increases the cost. No, main plate 1
The tubes 11 and 12 are installed in the 0, which is extremely disadvantageous in terms of design in a narrow space such as a wristwatch. Furthermore, because the lower surface pattern 5b of the coil terminal plate 5 makes it impossible to attach it directly to the coil winding core 2, consideration must be given to providing an insulating portion 4a on the coil winding frame 4.

FIG. 3 shows a conventional example in which both the circuit board 6 and the coil terminal plate 5 have single-sided patterns.
Push in the coil connecting stud 13 from the bottom surface and solder it to the upper surface pattern 6a.
The head 13a of the coil terminal plate 5 and the pattern 5a of the coil terminal plate 5 are pressed into contact with each other by tightening the setscrews 7 of the circuit board 6, and are electrically connected. According to this example, since both the circuit board 6 and the coil terminal plate 5 have a single-sided pattern, there is a great cost advantage, but if the tightening force of the circuit board set screw 7 becomes large, the screw portion will tighten as shown by the two-dot chain line. A drawback arises in that the substrate 6 sinks and the entire substrate 6 is warped. For this reason, it was difficult to increase the thickness of the board in order to increase the strength of the board and to control the screw tightening torque.

Next, embodiments of the present invention will be described. FIG. 4 is a plan view showing an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line A--A. The winding terminal 3a is a coil terminal plate 5 having a single-sided pattern 5a attached to one end of the winding core 2.
The terminals are processed by methods such as soldering. A coil connecting stud 13 having a slightly larger head diameter than the lower surface of the circuit board 6 is pushed in and soldered to the upper surface pattern 6a. The conduction between the coil terminal plate 5 and the circuit board 6 is established by attaching the screw 7 to the tube 11 planted in the ground plate 10.
It is the same as the conventional example shown in FIG. 3 in that it is screwed in place, but in FIG. Since the head diameter overlaps with the head diameter of the circuit board 6, the circuit board 6 does not warp, and the reliability of conduction is high. In addition, a dredge 11a with a diameter slightly larger than the screw diameter is provided on the top side of the tube 11, which allows the screw to stand up easily even if the screw does not have a guide at the tip, and improves the workability of screw tightening. It becomes possible to use the screws in common with other screws such as the other set screw 14 of the coil, which is also a great advantage in terms of after-sales service.

As described above, according to the present invention, the circuit board can be patterned on one side, and no extra setscrews are required, so cost reduction can be achieved. Since the parts are arranged so that they partially overlap, there is no possibility of warping, etc. Therefore, a highly reliable coil terminal connection structure can be provided at a low cost, and it also improves assembly workability and after-sales service. It has excellent properties and has extremely high practical value.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are cross-sectional views showing typical examples of the prior art, and FIGS. 4 and 5 are plan views and cross-sectional views showing embodiments of the present invention. 1... Coil, 5... Coil terminal board, 6... Circuit board, 7... Circuit board set screw, 9... Yoke, 10... Ground plate, 11... Tube, 13...
Coil connection stud, 13a...head.

Claims (1)

[Scope of utility model registration request] A terminal connection structure for a watch coil has a coil terminal plate for processing an end of a coil winding, and a wiring pattern for supplying a driving current to the coil on a surface opposite to the coil terminal plate, and the wiring a circuit board having at least two coil connecting studs fixed thereto for establishing electrical continuity on a surface closer to the coil terminal board than the pattern; and a circuit board having at least two coil connecting studs arranged at different positions from the coil terminal plate and the circuit board. and a setscrew for fixing the setscrews, the screw head of one of the setscrews being at least overlapped with a part of the flange of each of the two coil connecting studs in a plane. A coil terminal connection structure characterized by the following: