JPH036996Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a key switch used in an electronic keyboard instrument.

(Prior art) Conventionally, as shown in FIG. 4, a circular first conductor c and an annular second conductor d centered on the elastic movable part b that engages with the key a are arranged, A pair of printed wires f ₁ , f _{2 facing the insulating substrate e, and a pair of arc-shaped printed wires g 1 , g 2} facing each other so as to intersect with the printed wires f ₁ , f _{2 .}
are arranged, and as the key a is pressed, the elastic movable part b deforms and the first conductor c and the second conductor d move,
A pair of printed lines f ₁ , f ₂ are formed by the first conductor c.
A key switch is known in which a pair of printed wires g ₁ , g ₂ are short-circuited, and then a pair of printed wires g ₁ , g ₂ are short-circuited. By detecting the time difference until the printed lines g ₁ and g ₂ are short-circuited, a musical tone corresponding to the touch of a key is obtained.

(Problem to be solved by the invention) In this conventional key switch, when the elastic movable part b is pressed down from an oblique direction, the pairs of printed lines f ₁ , f ₂ and g ₁ , g ₂ are It is no longer possible to short-circuit stably and reliably, the difference in closing time for a certain key touch varies, chattering is likely to occur, and furthermore, the key touch load increases rapidly as the key displacement increases. Therefore, there was an inconvenience in that the key touch feeling was significantly adversely affected.

The present invention aims to eliminate such inconveniences of the conventional technology.

(Means for solving the problem) In order to achieve the above purpose, the present invention has the following features:
an insulating substrate on which are disposed a printed wire, and second and third printed wires that face each other with a gap therebetween and have different opposing lengths; an elastic conductive member disposed opposite to the second and third printed lines with a gap therebetween; During this movement, the elastic conductive member is pressed to deform it, and the deformed elastic conductive member is first brought into contact with the first and second printed lines, and then the first and third printed lines. and an actuator that is brought into contact with the wire.

(Example) Embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an insulating substrate disposed, for example, in a direction perpendicular to the key, and this insulating substrate 1 has a printed wire 2 having a comb-shaped portion, and a comb-shaped portion of the printed wire 2. The comb teeth interlock with each other,
A second printed line 3 and a third printed line 4, which face each other with a gap in between and have different opposing lengths, are disposed. Reference numeral 5 denotes an elastic conductive member fixed to the insulating material 7 and disposed on the insulating substrate 1 with a gap in between.
When the actuator 6 made up of the actuator 6 moves parallel to the substrate 1 by pressing a key (not shown), the roller 6b is biased by the elastic force of the leaf spring 6a.
The portion is pressed and deformed, and comes into contact with the first printed line 2, the second printed line 3, and the first printed line 2, and the third printed line 4 in this order.

Next, its operation will be explained.

In the key release state shown in FIGS. 1 and 2,
The roller 6b of the actuator 6 presses the elastic conductive member 5 by the elastic force of the leaf spring and deforms the pressed part, so that the center of the recessed part of the conductive member 5 touches the substrate 1 as shown by A in FIG. It is in a state of contacting only the first printed line 2 of.

As the key is pressed, the plate spring 6a moves downward as the key moves, the roller 6b rolls on the elastic conductive member 5, and the contact portion between the conductive member 5 and the first printed line 2 also moves downward. Move to. When this contact portion moves onto the second printed line 3, the first printed line 2 and the second printed line 3 are short-circuited via the conductive member 5, as shown by B in FIG. When the key is pressed further and the contact portion moves to the third printed line 4,
As shown by c in FIG. 2, the first printed line 2 and the third printed line 4 are short-circuited.

The time difference between the short circuit between the first printed line 2 and the second printed line 3 and the short circuit between the first printed line 2 and the third printed line 4 is the difference between the first printed line 2 and the second printed line 4. Opposite length L ₁ with line 3 and 1st
This corresponds to the difference in the facing length L ₂ between the printed line 2 and the third printed line 4, and is proportional to the pressing speed of the key, that is, the strength of the key pressing.

FIG. 3 shows the configuration of a printed line section according to another embodiment of the present invention.

This is a vertical inversion of the first, second, and third printed lines 2, 3, and 4 in Fig. 2, and when the key is released, the first printed line 2, the second and third printed lines 3, 4 is pressed by the roller 6b and the conductive member 5
When the key is pressed, the first printed line 2 and the third printed line 4 are first opened, and then the first printed line 2 and the second printed line 3 are opened. It's becoming like that.

(Effects of the invention) The present invention provides an insulating substrate on which a first printed line and second and third printed lines that face each other with a gap therebetween and have different opposing lengths are disposed. , an elastic conductive member disposed on the insulating substrate to face the first, second and third printed wires with a gap therebetween; It is movable along the length direction and parallel to the insulating substrate, and during this movement, the elastic conductive member is pressed to deform it, and the deformed elastic conductive member is first attached to the first and second printed wires. and an actuator that brings the first and third printed lines into contact with each other, so that the first printed line and the second printed line and the first printed line and the third printed line are connected via the conductive member. Each short circuit is stable and reliable, there is no variation for a certain key touch, there is no chatter even when the key is pressed strongly, and the key touch load only increases slightly even when the key displacement increases. This has the effect of having an extremely small effect on the key touch feeling.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a plan view of its printed line, Fig. 3 is a plan view of the printed line part of another embodiment, and Fig. 4 is a conventional key switch. The sectional view and FIG. 5 show a plan view of the printed line portion. 1... Insulating board, 2, 3, 4... Printed wire,
5... Elastic conductive member, 6... Actuator, 6
a... leaf spring, 6b... roller.

Claims (1)

[Claims for Utility Model Registration] 1. An insulating substrate on which a first printed line and second and third printed lines that face each other with a gap therebetween and have different opposing lengths are disposed. , an elastic conductive member disposed on the insulating substrate to face the first, second and third printed wires with a gap therebetween; It is movable along the length direction and parallel to the insulating substrate, and during this movement, the elastic conductive member is pressed to deform it, and the deformed elastic conductive member is first attached to the first and second printed wires. and an actuator for contacting the first and third printed lines. 2. The key switch according to claim 1, wherein the first, second, and third printed lines have comb-shaped portions.