JPH05113484A - Guide structure of plate-like component - Google Patents

Abstract

PURPOSE:To contrive the simplification and miniaturization of parts by overhanging a member bonded or integrally molded to a guide hole positioned and fixed with a base frame and fixing it with interference on projections of the base frame. CONSTITUTION:A gold-plated copper foil pattern 3a is bonded on the rear face of a circuit board 3. A press plate 4 is formed of a plate material having metal-made elasticity for fixing the circuit board 3 and positioned with a guide joggle 2a in a base frame, namely, a hoop row receiver 2. The copper foil pattern 3a is hung in the inside of a guide hole in the circuit board 3. At the time of assembling, plane position is guided with interference on the joggle 2a of the hoop row receiver 2 by the use of the copper foil pattern 3a. However, the shape of the copper foil pattern 3a of the guide hole inside is overhung to catch on the whole circumference of a round hole or contacted on a part of the round hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-like component fixing structure, and is particularly effective as a guide structure for an electronic timepiece circuit board in which a copper foil pattern is adhered to an insulating member.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional guide structure for a plate-like component and a guide structure for a circuit board of an electronic timepiece. 1 is a screw pin 1-a
The assembled main plate 2 is a train wheel bridge, which is a gear wheel bearing. 3 is a circuit board made of polyimide, which is one of flexible insulating materials, to which a gold-plated copper foil pattern 3-a is adhered. Circuit board 3 has screw pins 1-
It is guided by a and is fixed by a screw 5 via a circuit pressing plate 4. Further, the circuit board 3 has a structure in which the copper foil pattern overhanged in a hole different from the guide hole is electrically connected by a spring portion formed on the circuit pressing plate 4.

[0003]

However, in the case of guiding a thick board in the conventional circuit board guiding structure, the tightening margin is set too tightly, which makes it difficult to disassemble and assemble the components. Further, in order to optimize the setting of the tightening margin, it is necessary to finish the holes of the parts with extremely high accuracy, which may lead to an increase in the cost of parts. Further, in the conducting structure as shown in FIG. 3, not only the spring component for conducting the conduction is required, and the plane space needs to be wide.
The parts will also become difficult and will hinder the miniaturization of electronic watch movements that can be developed in a wide range of designs to meet market needs.

Therefore, the present invention solves the problems as described above, and it is possible to provide a guide structure for a plate component which is highly reliable and can be miniaturized.

[0005]

A guide structure for a plate-shaped component according to the present invention comprises a plate-shaped component in which at least two different materials are bonded or integrally molded, and a base frame having a protrusion for supporting the plate-shaped component. The plate-shaped component is characterized in that a guide hole that is positioned and fixed by the base frame is made to overhang a member that is adhered or integrally molded, and is fixed to the protrusion of the base frame by tightening margin. To do.

[0006]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 shows an embodiment of a guide structure for a circuit board of an analog quartz timepiece. Reference numeral 1 is a ground plate which is injection-molded from engineering plastic and which is a base plate of a movement and has a metal foot 5. Similar to the base plate 1, 2 is a train wheel receiver that is formed of plastic and guides a train wheel for decelerating the rotation of the step motor and transmitting it to the pointer, and a dowel for guiding the circuit board is formed on the upper surface. ing.
3 is a circuit board, which is made of epoxy resin containing glass fiber, which is one of the electrically insulated materials, and on the back surface,
The gold-plated copper foil pattern 3-a is adhered.
Reference numeral 4 denotes a holding plate formed of a metal elastic plate member for fixing the circuit board 3, and is positioned by a guide dowel 2-a on the train wheel bridge 2. The circuit board 3 has a copper foil pattern inside the guide hole. At the time of assembly, the flat position is guided to the dowel 2-a of the train wheel bridge 2 in this pattern by the interference. Conventionally, the circuit board holes were directly fastened to the dowels of the train wheel retainer, but if the board thickness is large or the guide hole has a small hole diameter, it is difficult to obtain the accuracy of the hole diameter and the guideability is poor. Not only is it worse, but there is a risk of damage to the dowel because the thick guide board is used as a tightening margin for the plastic guide dowel. However, according to the guiding structure of the present invention. The thickness of the copper foil pattern is at most about 35 μm, and an appropriate tightening margin can be secured as compared with the case where the circuit board having a thickness of several hundreds μm guides. The shape of the copper foil pattern inside the guide hole is overhanging so as to cover the entire circumference of the round hole as shown in Fig. 2 (a), or the shape that covers part of the hole as shown in (b). But it's okay. Further, as shown in (c), the hole may have an irregular shape other than the round hole.

FIG. 4 shows a second embodiment of the present invention, in which a train wheel bridge 2 made of metal is placed on a main plate 1. The train wheel bridge 2 is made of a metallic plate material, and a guide pin 8 made of metal is assembled. The circuit board 3 has a copper foil pattern bonded to the back surface of polyimide, which is one of flexible insulating materials. An insulating plate 6 is mounted between the train wheel bridge 2 and the circuit board 3 to prevent a short circuit between the metal train wheel bridge and the copper foil pattern. A button-type battery 7 is held with its negative electrode facing the base plate side, and the side surface portion is pressed against the train wheel bridge 2 by a spring 4-a integrally formed from an elastic metal pressing plate 4. The negative electrode of the battery 7 is in contact with the battery negative terminal 9 having a spring property, and the other end of the battery negative terminal is in contact with the negative pattern adhesively wired on the back surface of the circuit board to establish continuity between the power source and the circuit. .. The positive pole of the battery is in contact with the train wheel bridge and is electrically connected to the metal pin 8 assembled to the train wheel bridge. The metal pin 8 serves as a guide pin for the circuit board 3. The guide hole of the circuit board 3 has a plus pattern of the circuit in the hole, and the guide pin and the plus pattern are fixed by interference. Since the circuit board is made of flexible material, the guide hole can be freely deformed by the tightening margin with the pin, so even after disassembling the overhaul of the movement and reassembling, the contact pressure between the plus pattern and the guide pin is sufficiently secured. To be done. Figure 5
Although it is a cross-sectional view showing a conventional conduction structure, positive conduction is ensured by pressing a spring integrally formed from the holding plate 4 with a pattern overhung in a hole provided in the circuit board. However, in the conventional structure, in addition to the guide hole of the circuit board, a hole for establishing conduction is required, and it is further necessary to provide a spring portion on the pressing plate. As a result, the shape of the parts becomes complicated and hinders miniaturization. It can be seen that the circuit board guide structure of the present invention reduces the size of the circuit board and simplifies the shape of the holding plate.

As described above, the conductive structure has been described in the second embodiment, but in the case where the insulating film is adhered to the metal plate material, the insulation can be maintained by guiding the metal parts.

[0010]

As described above, according to the present invention,
The parts can be simplified and miniaturized without impairing the assembly guideability of the parts, which is effective not only in reducing the cost but also in the structure of the small movement necessary to meet a wide range of design needs in the market.

[Brief description of drawings]

FIG. 1 is a sectional view showing a guide structure according to an embodiment of the present invention.

FIG. 2 is a partial plan view showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional guide structure.

FIG. 4 is a partial sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1: Ground plate 1-a: Foot support 2: Wheel train support 3: Circuit board 3-a: Copper foil pattern 4: Presser plate 4-a: Battery plus conduction spring 5: Screw 6: Insulation plate 7: Battery 8: Guide pin

Claims (1)

[Claims] 1. A plate-shaped component formed by adhering or integrally molding at least two different kinds of materials, and a base frame having a protrusion for supporting the plate-shaped component. The plate-shaped component is formed by the base frame. A guide structure for a plate-shaped component, characterized in that an adhesive or integrally molded member is overhung in a guide hole to be positioned and fixed, and is fixed to a protrusion of the base frame by tightening.