JPS60221915A - Keyboard switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a keyboard switch applied to cash registers, word processors, communication terminal equipment, and various other office and automation equipment.

<Background of the Invention> Conventionally, as this type of keyboard switch, for example,
As shown in the figure, there is one in which a keyboard 6 is mounted on a membrane switch plate 5 with a certain gap.

Such conventional products lack ease of assembly due to the large number of parts and complicated structure, and are bulky due to the keyboard and switchboard in particular.

<Objective of the Invention> An object of the present invention is to provide a novel keyboard switch that has a simplified structure and a reduced thickness due to an extremely simple configuration.

<Description of Embodiments> In the keyboard switch of the present invention, a guide post 12 having a guide groove 15 penetrating vertically is fixed to a substrate 1, and a key plunger 3 is directly attached to the kite post. Become.

The board 1 is a hard plate such as a synthetic resin board, an aluminum board, or a steel plate, and fixed contacts 21 are printed on two sides of the board 1, and movable contacts 22 paired with the fixed contacts are provided on the bottom surface. The surface switch 2 is constructed by superposing a flexible sheet 24 on which an insulating spacer 23 is formed. In the substrate 1, holes 11.degree. 11 are formed on both sides of the contact, and a pair of holes 12 and 122 are fixedly provided to the holes 11 and 11, respectively.

The guide posts 12, 121 are constructed by injection molding made of nylon, Duracon or other lubricating synthetic resin, or by outsert molding directly on the substrate 1,
Side walls 14, 1. opposite to both sides of the outer wall 13, respectively.
4 is provided, and has a guide groove 15 that penetrates downward and is open on the inner surface, and the key plunger 3 is engaged in the guide grooves 15, 15 so as to be able to move up and down. keyshi lunger 3
is a molded body made of a lubricating synthetic resin similar to the guide post, and has an arch shape that fits in the guide grooves 15 and 15 so as to be able to rise and fall freely, and the opposing legs 31 and 31 are provided with grooves, respectively. 32, the elastic leg piece 33 and the elastic leg piece 3
At the tip of 3, a claw piece 34 is formed that locks on the inner lower surface of the extraction hole 11 and restricts the rising end of the hole 11. At the middle of the connecting part 35 between both legs 31 and 31, a key is formed on the 2nd side. A spring stopper shaft 38 is provided protruding from the lower surface of the mounting shaft 37 of the top 36, and a coil spring 4 is interposed between the engagement shaft 38 and the corresponding board 1. As shown in FIG. 5, the coil spring 4 has a key plunger upward return spring section 42 formed in series, the winding diameter of which is gradually enlarged in a conical shape, at the lower end of a switch pressing spring section 41 that forms a spiral strip with equal pitches. The coil spring 4 surrounds the contacts 21 and 22 and is interposed between the upper surface of the flexible film 24 and the stop shaft 38 of the key plunger 3,
The key plunger is energized to rise. In addition, the present invention
In addition to the illustrated spring 4, two springs, one for pressing the switch and one for returning the plunger, may be interposed.

The embodiment shown in FIG. 3, similar to the previous embodiment, consists of two flexible sheets on which a pair of contacts 21 and 22 are printed and wired onto a substrate 1 on which guide posts 12 and 122 are fixed. 2
In this case, an insulating spacer 23 is laminated on the lower surface of one flexible sheet 24 except for the movable contact 22, and the pair of contacts 21. A switching gap is formed between 22.

The embodiment shown in FIG. 4 consists of two flexible sheets 24.2.
A sheet 26 for an insulating spacer is inserted between the
The sheet is provided with through holes 27 at 21 and 22 contact points.

Although not shown in the drawings, in actual practice, a silicone rubber sheet may be used as the flexible sheet 24 constituting the movable contact. You can get sex.

<Structure and Effects of the Invention> As described above, the present invention provides a substrate having a plane switch on its upper surface, with fixed guide posts vertically penetrating and facing each other on both sides of the contacts, and a key plunger attached to the guide posts. Because a coil spring is inserted between the key plunger and the board to press the contact and return the plunger, the conventional keyboard can be omitted, simplifying the configuration and making the keyboard switch in particular much thinner. , has the effect of achieving the intended purpose.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a keyboard switch according to the present invention;
2 is a perspective view of an assembled state, FIGS. 3 and 4 are sectional views showing other embodiments, FIG. 5 is a front view of a coil spring, and FIG. 6 is a sectional view of a conventional example. 1... Board 11... Hole 12.121-
... Guide post 15 ... Kite groove 2 ... Surface switch 21 ,
22...Contact 23...Insulating spacer 2
4.25...Flexible sheet 3...Key plunger 31...Legs 3
6. Key top 38... Stop shaft 4...
...Coil spring 41 ...Contact suppression spring part 42...Plunger return spring part Patent applicant Tateishi Electric Co., Ltd.-Ah Fig. 76 15 1, +, 5 Fig.

Claims (5)

[Claims] (1) For a board on which a surface switch having a pair of contacts is disposed on the top surface, guide posts that face each other and penetrate through the front and back surfaces are fixed on both sides of the contacts, and a key plunger is attached to the guide posts. A keyboard switch that is engaged to be able to move up and down, and that a coil spring is interposed between the key plunger and a board to raise and return the key plunger and to lower pressure on a pair of contacts. (2) The keyboard switch according to claim 1, wherein the substrate is a synthetic resin plate, an aluminum plate, or an iron plate. (3) The keyboard switch according to claim 1, wherein the guide post is a synthetic resin molded body fixed by outsert molding into a hole drilled in the board. (4) The keyboard switch according to claim 1, wherein the surface switch is constructed by printing wiring a fixed contact on the surface of the substrate and a movable contact on the lower surface of a flexible sheet. (5) The keyboard switch according to claim 1, wherein the surface switch has a fixed contact and a movable contact printed and wired on two flexible sheets arranged on a board.