JPH0628949A - Keyboard switch - Google Patents

Abstract

PURPOSE:To provide a keyboard switch by which on-and-off operation of the switch can be carried out always stably even if a bow and the like are caused more or less in a printed board. CONSTITUTION:Movable terminals 10 fitted to the roots of parts extending downward from a movable contact point spring 8 and a fixed contact point piece 9, are mounted and slodered in installation holes in prescribed positions of a printed board 6. Even when a bow is caused in the printed board 6 due to influence of an external factor such as a temperature change, bellow parts 10-1 arranged in these movable terminals 10 move flexibly to the bow of the printed board 6, and absorb pressure transmitted to the movable contact point spring 8 and the fixed contact point piece 9 through the movable terminals 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard switch included in a keyboard used for an input device such as an information processing device.

[0002]

2. Description of the Related Art Conventionally, a keyboard switch has a structure as shown in FIG. That is, the housing 4 having the key top 1 on the top and mounted on the printed circuit board 6
The protrusion 2 of the plunger 2 is provided by providing the plunger 2 with the up plate 3 provided on the upper surface of the upper surface of the housing 2 on the lower convex portion so that the up plate 3 is fitted into the opening of the upper surface of the housing 4. It is housed in the housing 4. The convex portion of the plunger 2 is the coil spring 5
One end of the coil spring 5 can be accommodated, and the other end of the coil spring 5 is attached to a protrusion provided at the center of the bottom surface of the housing 4. As a result, the plunger 2 moves to the coil spring 5
To move up and down.

On the other hand, in the housing 4, the plunger 2
A switch that is turned on / off in accordance with the vertical movement of the switch is provided. This switch includes a movable contact spring 8 as a movable elastic contact piece that forms one of electrical contacts, a fixed contact piece 9 that is attached to the housing 4 and forms the other of the electrical contacts, the fixed contact piece 9 and the plunger 2. The actuator 7 is configured to engage the electric contact between the movable contact spring 8 and the fixed contact piece 9 by engaging with. still,
As shown in FIG. 4 (A), the movable contact spring 8 and the fixed contact piece 9 each have a movable contact spring terminal 8-1 and a fixed contact piece terminal 9-1 at their ends, and these terminals are soldered to each other. It is attached and directly mounted on the printed circuit board 6.

The keyboard switch having such a structure is movable because the folding piece of the curved convex portion 7a of the actuator 7 moves in and out between the movable contact spring 8 and the fixed contact piece 9 as the plunger 2 moves up and down. The element formed by the contact spring 8, the fixed contact piece 9 and the actuator 7 is opened and closed. As a result, the switch is off when the element is open and on when the element is closed.

[0005]

In the case of the above-described conventional keyboard switch, when the printed circuit board 6 is warped due to an external influence (environment) such as a temperature change when mounted on the printed circuit board 6, As shown in 4 (B),
Moving contact spring terminal 8 soldered to printed circuit board 6-
1 and pressure are applied to the fixed contact piece terminal 9-1 and this stress is transmitted to the movable contact spring 8 and the fixed contact piece 9 through the movable contact spring terminal 8-1 and the fixed contact piece terminal 9-1. As a result, the movable contact spring 8 and the fixed contact piece 9 often deform and adversely affect the on / off operation of the switch.

The present invention has been made to solve the above drawbacks, and a technical object thereof is to provide a keyboard switch capable of always stably turning on and off the switch even if the printed circuit board is slightly warped. Especially.

[0007]

According to the present invention, there is provided a keyboard switch comprising: a plunger that moves up and down in a housing provided on a printed circuit board; and a switch that turns on and off according to the up and down movement of the plunger. The switch has a movable terminal having a bellows portion that flexibly moves with respect to the warp of the printed circuit board, a movable elastic contact piece having one end attached to the movable terminal and the other end forming one of electrical contacts, and one end serving as the movable terminal. A fixed contact piece that is attached to the housing and has the other end attached to the housing, and the fixed contact piece that forms the other of the electrical contacts, and the bellows portion absorbs pressure transmitted to the movable elastic contact piece and the fixed contact piece through the movable terminal. You get a keyboard switch that is a thing.

Further, according to the present invention, in the keyboard switch, the movable terminal is arranged in the central portion so that the bellows portion can be housed in the printed circuit board, and one end of the movable terminal can be projected from the printed circuit board. You get a keyboard switch.

[0009]

The keyboard switch of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1
FIG. 3 is a sectional view showing a keyboard switch according to an embodiment of the present invention.

The keyboard switch has the same structure as the conventional one described with reference to FIG. 3 except for the switch described in detail later, and therefore will not be described in detail here.

The switch here is basically housed in the housing 4 and is turned on and off as the plunger 2 moves up and down. In addition to the movable contact spring 8, the fixed contact piece 9, the actuator 7, the movable terminal. 10 forms an element.

Of these, the movable terminal 10 is the printed circuit board 6
A bellows portion 10-1 that can be flexibly moved with respect to the warp and can be housed in the printed circuit board 6 is provided in a central portion. The movable terminal 10 has one end protruding from the printed circuit board 6 and the other end fixed contact piece 9 and movable contact spring 8
And one end of each is attached. Further, the other end of the movable contact spring 8 forms one of the electrical contacts, and the other end of the fixed contact piece 9 forms the other of the electrical contacts and is mounted on the housing 4.

FIG. 2 (A) is shown to explain the mounting of the movable contact spring 8 and the fixed contact piece 9 and the movable terminal 10. As shown in the figure, the movable terminal 10 has one end projected from the printed circuit board 6 and soldered through a mounting hole provided at a predetermined position of the printed circuit board 6 as described above, but the other end is movable contact spring 8 Also, a receiving hole matching the shapes of the movable contact spring 8 and one end of the fixed contact piece 9 is formed so that one end of the fixed contact piece 9 can be fitted.

Next, the operation of the keyboard switch having such a structure will be described. In FIG. 1, when the pressing force by operating the key top 1 is transmitted to the lower plunger 2, the plunger 2 moves up and down by the coil spring 5 in the element formed by the movable contact spring 8, the fixed contact piece 9 and the actuator 7. With that,
The opening / closing operation is performed similarly to the case described in FIG. As a result,
The switch is off when the element is open and on when the element is closed.

By the way, FIG. 2B shows a case where the keyboard switch of the present invention is used on the printed circuit board 6 which is warped. Here, even when the printed circuit board 6 is warped due to an external factor (environment) such as a temperature change of the keyboard switch, the movable contact spring 8 and the fixed contact piece 9 are warped against the printed circuit board 6.
The bellows portion 10-1 of the movable terminal 10 attached to the base of the portion extending downward of the
The manner in which the pressure transmitted to the movable contact spring 8 and the fixed contact piece 9 is absorbed is described. As a result, even when the printed circuit board 6 is warped, the on / off operation of the switch can be stably obtained.

[0016]

As described above, according to the keyboard switch of the present invention, the movable terminal having the bellows portion that can be moved flexibly is provided, and the movable terminal extends below the movable contact spring and the fixed contact piece. Since it is attached to the base of the part, even when the printed circuit board warps due to external factors such as temperature changes, the bellows part flexibly moves and the pressure transmitted to the movable contact spring and fixed contact piece through the movable terminal is applied. Since it absorbs, even if the printed circuit board is slightly deformed, the on / off operation of the switch can always be stably performed.

[Brief description of drawings]

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

2A is a view for explaining the mounting of a movable contact spring and a fixed contact piece and a movable terminal included in the keyboard switch shown in FIG. 1, and FIG. 2B is a printed circuit board which is warped. FIG. 7 is a view for explaining a case where the keyboard switch shown in FIG. 1 is used above.

FIG. 3 is a sectional view showing a conventional keyboard switch.

4A is a diagram shown for explaining a movable contact spring and a fixed contact piece included in the keyboard switch shown in FIG. 3, and FIG. 4B is shown in FIG. 3 on a warped printed circuit board. It is the figure shown in order to demonstrate the case where a keyboard switch was used.

[Explanation of symbols]

 1 Key Top 2 Plunger 3 Up Plate 4 Housing 5 Coil Spring 6 Printed Circuit Board 7 Actuator 8 Moving Contact Spring 8-1 Moving Contact Spring Terminal 9 Fixed Contact Piece 9-1 Fixed Contact Piece Terminal 10 Moving Terminal 10-1 Bellows

Claims (2)

[Claims] 1. A keyboard switch comprising a plunger that moves up and down in a housing provided on a printed circuit board and a switch that turns on and off in response to the vertical movement of the plunger, wherein the switch is a warp of the printed circuit board. A movable terminal having a bellows portion that moves flexibly with respect to the movable terminal, a movable elastic contact piece having one end attached to the movable terminal and the other end forming one of electrical contacts, and one end attached to the movable terminal and the other end. Is attached to the housing and includes a fixed contact piece that forms the other of the electrical contacts, and the bellows portion absorbs pressure transmitted to the movable elastic contact piece and the fixed contact piece through the movable terminal. A keyboard switch characterized by being a thing. 2. The keyboard switch according to claim 1, wherein the movable terminal is arranged in a central portion so that the bellows portion can be housed in the printed circuit board, and one end of the movable terminal can be projected from the printed circuit board. A keyboard switch characterized by being present.