JPH0433618Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a flat switch, and in particular, it seals the operating space of the switch for each pair of fixed contacts and movable contacts, and separates other sealed parts within each of the sealed contacts. This invention relates to a flat switch that has a non-interference independent air escape section.

Prior Art and Problems FIG. 5 shows an example of the configuration of a conventionally used flat switch.

That is, 1 in the drawing has a fixed contact 2 and a terminal 3 on one side.
A circuit sheet having a certain number of patterns formed thereon, the circuit sheet 1 and the fixed setting 2 when attached to the circuit sheet 1.
A spacer 4 having a through hole 6 formed to correspond to the spacer 4 and a ventilation hole 7 connecting the through holes 6 to each other.
, a movable contact 5 attached to the spacer 4 so as to face the fixed contact 2 of the circuit sheet 1 via the through hole 6, and the spacer 4.
and a surface film 8 pasted on the movable contact 5, a conventional flat switch was constructed.

This flat switch has a through hole 6 as is well known.
By keeping each switch operating space in the switch airtight state, the deterioration of the contact parts is prevented, while at the same time, the gas in the switch operating space, which has no place to escape when the switch is operated, is transferred to other switch operating spaces through the ventilation hole 7. By making the switch movable, it was designed to prevent deterioration in operability due to the closed state, and to provide a good operating feel with a click or snap action.

However, since the flat switch with such a configuration has the ventilation hole 7, a new mold must be made each time depending on the number and arrangement of switches required by the equipment that uses the flat switch. It was extremely uneconomical.

Purpose of the Present Invention In view of the drawbacks of the conventional flat switch, it is an object of the present invention to provide a flat switch that is inexpensive and has good operability.

Structure of the Present Invention The present invention solves the drawbacks of conventional flat switches by sealing the switch operating space for each pair of fixed contacts and movable contacts, and providing individual air escape sections.

Embodiment The structure of a flat switch which is an embodiment of the present invention has been shown in FIGS. 1 to 3, and the drawings will be explained below.

11 on the drawing has a fixed contact 12 and a terminal 13 on one side.
This is a circuit sheet on which an arbitrary number of patterns are formed. Fixed contact 1 on this circuit sheet 11 when attached to this circuit sheet 11
Since the through hole 16 is bored so as to correspond to the spacer 2, the spacer is shown as 14, and the through hole 16 of the spacer 14 has a substantially square shape, and a projecting piece 17 is formed on one circumferential surface of the spacer. . The contact 15 faces the fixed contact 12 on the circuit sheet 11 through the through hole 16 of the spacer 14.
A movable contact indicated by 18 is formed in a dome shape, and a surface film 18 is opposed to the circuit sheet 11 via the movable contact 15 and the spacer 14.

The construction of a flat switch consisting of individual parts formed in this way can be understood in particular from FIGS. 2 and 3.

That is, when the spacer 14 is attached to the surface of the fixed contact 12 of the circuit sheet 11 and one end of the peripheral surface of the movable contact 15 is placed on the protrusion 17 in the through hole 16 formed in the spacer 14, the other end becomes the fixed contact. By contacting the movable contact 12A and pressing the movable contact 15, the fixed contact 12A and the fixed contact 12B can be electrically connected. Thus, the spacer 14 and the movable contact 15
By pasting the surface film 18 thereon, each through hole 16 is individually sealed, and an air escape part 19 is formed, and when the movable contact 15 is pressed, the switch is operated through the gap between the spacer 14 and the movable contact 15. Since the gas in the space can move to the air escape part 19 and is further cut off from the outside air, deterioration of the contacts and reduction in operability can be prevented.

In the flat switch according to the present invention, each of the switch operation spaces is independent, so that it is possible to arbitrarily separate them to obtain a desired number of flat switches.

By the way, the present invention may also be used in electrical equipment in which the surface film 18 on the movable contact is operated via a key top, as shown in FIG. 4, without directly pressing the surface film 18 on the movable contact with the finger.

To explain FIG. 4, when the flat switch is attached to the operation panel 21 side of the main printed circuit board 20 having a circuit formed of electronic components (not shown), a terminal 13' corresponding to the terminal 13 is attached. will be established.

A required number of flat switches obtained through mass production are cut out and mounted on this printed circuit board 20, and the terminals 13 and 13' are connected with a known thermal connector 22, and the A key top 23 having a protrusion 23A is attached to a push button hole 21A provided in advance on the operation panel 21, and the operation panel 21 is fixed to the device.

In a flat switch with such a configuration,
When the key top 23 is pressed, the protrusion 23A comes into pressure contact with the movable contact 15, deforming the movable contact 15 and operating the switch. At this time, the click feeling of the flat switch is transmitted to the operator via the keytop 23, so the operator can operate the switch without feeling anxious.

Effects Since the flat switch of the present invention is configured as described above, each sealed switch part can be connected to other sealed switch parts without forming an air escape passage from the sealed switch part to another place as in the conventional case. Air escape takes place under non-interference conditions. Therefore, the switch can be separated and used as desired depending on the desired number of pieces, so there is no need to raise the mold as often as in the past, which saves on mold costs, while lowering manufacturing costs through mass production. Moreover, it is possible to operate the surface sheet directly with your fingers without sacrificing operability or allowing contact deterioration.Also, by pasting it on the pattern of the main printed circuit board, you can operate the operation panel. Since it can also be operated via the key top, it is extremely practical and can be used in various electrical devices. Note that the shapes of the spacer and the movable contact are not limited to those in the embodiment described above, and an air imitation portion is formed when the switch parts are assembled.
It is possible to arbitrarily design and implement the individual switch operation spaces so that they are each sealed.

[Brief explanation of the drawing]

11 is a circuit sheet, 12 is a fixed contact, 1
3 is a terminal, 14 is a spacer, 15 is a movable contact,
16 is a through hole, 17 is a protruding piece, 18 is a surface film, and 19 is an air escape part. Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a plan view of the same embodiment, Fig. 3 is a sectional view taken along line A-A' of the same embodiment, and Fig. 4 is another embodiment of the present invention. FIG. 5 is an explanatory diagram of a conventional flat switch.

Claims (1)

[Claims for Utility Model Registration] (1) A circuit sheet formed with any number of patterns having fixed contacts and terminals on at least one side, and a polygonal or circular through hole that faces the fixed contacts when attached to the circuit. and a movable contact that faces the fixed contact through the through hole and has a part of its outer shape in contact with a part of the inner circumferential surface on each side of the through hole, A protruding piece is protruded in the inner diameter direction,
A predetermined outer circumferential portion of the movable contact is placed in contact with a predetermined inner circumferential portion of the through hole, and the lower surface of a portion of the movable contact is placed on the upper surface of the protrusion of the through hole, thereby creating an independent air escape. A flat switch characterized by forming a part. (3) A flat switch characterized in that any switch can be separated and used from a plurality of switch groups according to claim 1 of the utility model registration claim.