JPS5838494Y2 - Oshi button switch - Google Patents

Description

[Detailed description of the invention] This invention relates to a push button switch mainly used in electronic desktop calculators, and its purpose is to have a simple structure,
To provide a push button switch whose contact part has stable operation and excellent electrical characteristics, and which has a good operating feel without snap action when operated.

Conventionally, as shown in FIG. 4a, a disk made of an elastic thin metal plate is curved like a part of a spherical surface, and a contact portion 22 is protruded from the inner center thereof, and a plurality of legs are formed at the peripheral edge. 23
A disc-shaped movable contact 21 is provided with (does not need to be provided)
In addition, there are various types of movable contacts 24 that are approximately triangular in shape, as shown in FIG. A push button switch with a structure was devised.

This type of switch has a movable contact placed on an insulating board with a fixed contact, and when the center of the surface of the movable contact is pressed, it flips and the contact part contacts the fixed contact with a snap action, causing the contact to be pressed. When released, it returns to its original state due to its own elasticity, but it generally has the drawback that chattering is likely to occur due to vibration when reversing, and the movable contact does not operate due to the relationship with the conductive part on the board. The movable contact 24 is more convenient than the disc-shaped movable contact 21 in order to have a structure that does not rotate due to vibrations caused by time, etc. However, on the other hand, the movable contact 24 has a snap action because the peripheral part is cut off. There were drawbacks such as weakening.

The present invention has been devised in view of the above points, and the above-mentioned drawbacks are solved by providing a mechanism for damping the vibration and rotation of the curved disc-shaped movable contact.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 denotes a printed circuit board, with fixed contacts 2a on the surface,
A plurality of fixed contact portions 2 each including a set of conductive portions 2b disposed around the fixed contact portions 2, and a plurality of output terminals 3;
A circuit 4 is provided to appropriately connect them, and the portions other than each fixed contact portion 2 and each output terminal 3 are coated with an insulating film using resist or the like.

Reference numeral 5 denotes a disk-shaped movable contact made by pressing a thin elastic metal plate, such as a stainless steel sheet, and bending it like a part of a spherical surface. is provided with leg portions 7 bent at equal intervals and at appropriate angles, and from the circumferential portion between the two appropriate leg portions 7, 7, the brake A locking hole 8 is bored through which the protrusion 13 is inserted.

When the movable contact 5 is placed on the fixed contact portion 2 of the substrate 1, the legs 7 come into contact with the conductive portions 2b, and the contact portion 6 comes into contact with the fixed contact 2a. The legs 7 lift the movable contact 5 from the board 1 surface, and the peripheral edge thereof is connected to the circuit 4.
He also plays a role that does not make contact with him.

Reference numeral 9 denotes an insulating plate made of synthetic resin or the like, which is provided with guide holes 10 for housing and positioning the movable contacts 5 at positions that coincide with the respective fixed contact parts 2 when stacked on the printed circuit board 1. , cutouts 11 are provided at positions corresponding to the three groups of output terminals.

Each guide hole 10 has a protruding piece 12 that is thinner than the thickness of the insulating plate 9 protruding from the edge of the upper surface thereof, and a bar-shaped braking protrusion 13 that protrudes in the direction of penetration of the guide hole at right angles to the surface of the protruding piece 12. are provided, and these are formed integrally with the insulating plate 9.

The braking protrusion 13 is inserted into the locking hole 8 of the movable contact 5 and serves to lock the movable contact 5 and brake its rotation and vibration during operation, and also serves to brake the rotation of the movable contact 5 and the vibrations during operation. serves to determine the position for contacting the conductive parts 2b of the fixed contact part 2, respectively.

Reference numeral 14 designates a push button made of synthetic resin, with stoppers 15 and 15 on a pair of sides for preventing removal, and a pressing part 16 for pressing against the center of the movable contact 5 at the center of the lower surface. It is.

Reference numeral 17 denotes a frame made of synthetic resin, and when stacked on the insulating plate 9, guide holes 18 are provided in which the push buttons 14 are slidably inserted at positions corresponding to the guide holes 10 of the frame. There are stoppers 15 and 15 for the push button 14 on the inner wall of the pair.
Guide grooves 19 and 19 are provided for slidably inserting the screws and preventing them from coming out.

The push button switch of this embodiment is composed of the above-mentioned parts, and to explain its assembly, first, the insulating plate 9 is placed on the printed circuit board 1 so that each guide hole 10 is aligned with each fixed contact part 2. At this time, the movable contact 5 is inserted into each guide hole 10, and the locking hole 8 of the movable contact 5 is inserted into the braking protrusion 13 protruding into the guide hole 10 to lock it, and then the push button 14 is pressed. The frame 17 attached to each guide hole 18 is stacked on the insulating plate 9, each guide hole 18 and each guide hole 10 are aligned, and then the board 1, the insulating plate 9, and the frame 17 are fixed by appropriate means, and the assembly is completed. ends.

Next, the operation of the push button switch according to the embodiment will be explained. The legs 7 of each movable contact 5 are always in contact with the conductive part 2b of each fixed contact 2, and are not operated. In this state, as shown in FIG. 2a, the contact part 6 is separated from the fixed contact 2a, the movable contact 5 pushes up the push button 14, and the stopper 15.15 is placed at the end of the guide groove 19.19 of the frame 17. Upon contact, the push button 14 stops, and the switch is in the OFF state.

When any push button 14 of the switch in the stationary state is pressed, the pressing part 16 presses the center of the movable contact 5, and when the push button 14 moves to the extent that it is, the movable contact 5 reverses with a snap action. The contact portion 6 comes into contact with the fixed contact 2a, and the circuit of the fixed contact portion 2 is turned on (see FIG. 2).

When the pressure applied to the push button 14 is released, the movable contact 5 reverses itself to its original state due to its own elasticity, and the switch returns to its original OFF state as shown in FIG. 2a.

When the push button switch of the present invention is operated, especially when the movable contact 5 is reversed, the vibration generated is absorbed by the braking protrusion 13 that lightly contacts the edge of the locking hole 8, so the occurrence of chattering is extremely reduced. This has the effect of suppressing the rotation of the movable contact 5 due to the braking protrusion 13, and the leg portion 7...
. . . and the conductive part 2b of the board 1... will not be damaged and cause poor contact, and the printed circuit 1 to the circuit can be connected to the board 1.
This has practical effects such as being able to be provided only on one side of the surface.

The brake protrusion is provided on the circuit board 1 corresponding to the locking hole 6 of the movable contact 5 so as to protrude in the penetrating direction of the guide hole 10 of the insulating plate 9, as indicated by symbol 13' in FIG. The same effect as described above can be obtained.

Moreover, it goes without saying that the brake protrusion can also be applied to movable contacts having shapes other than the disk shape.

[Brief explanation of the drawing]

Figures 1 to 3 are views showing an embodiment of the present invention, Figure 1 is an exploded perspective view of the main part, Figure 2 a, l) is a cross-sectional side view of a unit push button switch, and a is a non-operating state. FIG. 3 is a perspective view of a main part showing a case where a braking protrusion is provided on a printed circuit board. FIGS. 4a and 4l) are diagrams showing conventional movable contacts, in which a is a disc-shaped movable contact and b is a diagram showing a substantially triangular movable contact. DESCRIPTION OF SYMBOLS 1...Printed circuit board, 2...Fixed contact part, 2a...Fixed contact, 2b...
Conductive part, 5... Movable contact, 6... Contact part, 7... Leg part, 8... Locking hole, 9...
...Insulating plate, 10...Guide hole, 13.
13'...Brake protrusion, 14...Push button,
17... Frame, 19... Guide groove.

Claims (1)

[Scope of utility model registration request] It has a circuit board provided with fixed contacts, a guide hole is bored in an insulating plate arranged on the circuit board, and the guide hole is made of an elastic thin metal plate and curved like a part of a spherical surface. A movable contact is housed, a push button for pressing the movable contact is arranged on the movable contact, a locking hole is bored in the curved part of the movable contact, and one of the insulating plate and the circuit board is provided. To,
A braking protrusion is formed that protrudes in the penetrating direction of the guide hole of the insulating plate, and the braking protrusion is inserted into the locking hole of the movable contact, so that the movable contact is placed on the fixed substrate through the guide hole of the insulating plate. A push button switch characterized by being held in such a way that it can be reversed inside.