JPH042010A - Switches and input devices using switches - 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 [Field of Industrial Application] The present invention relates to a switch used in electronic equipment, etc., and an input device using this switch.

[Conventional technology]

FIG. 7 ta) shows a cross-sectional view of a switch disclosed in, for example, Japanese Utility Model Application Publication No. 1-160629. 3a is a fixed contact on the periphery that is electrically connected to the movable contact piece 2, 3b is a fixed contact in the center, 4 is a casing that houses each of the above components, and 5 is electrically electrically connected to the fixed contact 3a. 1st terminal, 6 is fixed contact 3
This is the second terminal that is electrically connected to b. FIG. 7 (bl indicates an input device using the above switch, 8 indicates a switch, 9 indicates an internal element wired from the input device, and is connected to one terminal of the switch, and the other terminal is grounded. ing.

The conventional switch is configured as described above. For example, when electrostatic discharge is applied to the operation button 1, this discharge is more likely to be transmitted from the operation button 1 to the first terminal 5 via the movable contact piece 2 and the fixed contact 3a. , is difficult to be transmitted from the fixed contact 3b to the second terminal 6.

[Problem to be solved by the invention]

However, in the conventional switch, it is not possible to determine from the outside which of the terminals 5 and 6 is electrically connected to which of the fixed contacts 3a and 3b. For this reason, the first terminal 5, which is electrically connected to the fixed contact 3a, may be incorrectly wired to the element 9 in the input device, and in this case, the electrostatic discharge applied to the operation button l may be transferred to the movable contact. 2 to the internal element 9 through the fixed contact 3a and the first terminal 5, and as a result,
There is a problem that malfunction of the input device and destruction of the element 9 are likely to occur.

This invention was made to solve the above-mentioned problems, and aims to provide a switch whose terminals can be easily identified, and an input device which prevents malfunction and element destruction due to electrostatic discharge. The purpose is to obtain.

[Means to solve the problem]

The switch according to the present invention includes a first terminal that is electrically connected to a movable contact piece that is operated by an external operation, and a second terminal that serves as a signal output terminal that configures the switch between the first terminal and the first terminal. , the first terminal is characterized by displaying easily distinguishable markings.

Further, the input device according to the present invention includes a first terminal that is electrically connected to a movable contact piece that is operated by an external operation;
In an input device using a switch including a second terminal as a signal output terminal that constitutes a switch between the input device and the terminal,
It is characterized in that the first terminal is connected to a ground side or a power source side of the input device.

[For production]

Since the switch in this invention displays the marking on the first @, it is possible to easily identify the correct connection to the input device. Moreover, the input device in this invention is
By connecting the first terminal to the ground or power supply side of the input device, electrostatic discharge will be transmitted from the movable contact piece of the switch through the first terminal to the ground or power supply side of the input device, resulting in malfunction of the device or damage to the elements. Destruction can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
Figure ia1. (bl shows a cross-sectional view of the switch according to the present invention and an input device using the switch. The configuration diagram of the switch is the same as the conventional switch shown in Fig. 7 ta+, so the same parts are given the same reference numerals. The explanation will be omitted.

7 is a marking for identifying the first terminal 5 of the switch, which is displayed on the casing 4 near the terminal 5 with paint or the like.

The input device using the switch 8 configured as described above is
The internal element 9 of the input device is connected to the second terminal 6 of the switch, and the first terminal 5 is connected to the ground side of the device.

Therefore, in the switch described above, the electrostatic discharge applied to the operation button 1 is transmitted from the movable contact piece 2 to the first terminal 5 via the fixed contact 3a, but is not transmitted to the 23rd fI element 6. In addition, in the input device, since the first terminal 5 is connected to the ground side, electrostatic discharge is transmitted from the first terminal 5 to the ground side and is difficult to be transmitted to the internal element 9. Therefore, the input device may malfunction or the internal element Destruction can be prevented.

In the above embodiment, an example using a two-pole pushbutton switch was shown, but a slide type switch as shown in Fig. 2 (al, mountain 1), a seesaw type switch as shown in Fig. 3 (fa), and (bl) may also be used. The same effect as described above can also be achieved when a switch is used.

FIG. 4 shows another embodiment of the switch, in which the movable contact piece 2 is not electrically connected to any of the terminals 5, 6 in the open state. In this case, the fixed contact 3a that is electrically connected to the first terminal 5 may be moved closer to the movable contact piece 2 than the fixed contact 3b that is electrically connected to the second terminal 6, or the fixed contact 3a that is electrically connected to the first terminal 5 may be moved closer to the movable contact piece 2, or the Fixed the surface area of contact 3a Contact 3
A similar effect can be expected by making the static electricity conductivity to the first terminal 5 side higher than that to the second terminal 6 side by making a difference between the re-fixing contacts 3a and 3b by making it larger than b.

Further, the marking 7 of the switch may be indicated by printing, or may be made by differentiating the molding of the casing 4 or the external shape of the terminal.

Furthermore, in a device in which the input section has a circuit configuration as shown in Figure 6fa), the first
By connecting the terminal 5 to the power supply side of the input device, electrostatic discharge is transmitted from the first terminal 5 to the power supply side and is less likely to be transmitted to the internal element 9 side, thereby preventing malfunction of the apparatus and destruction of the element.

Although this invention has been described with respect to the case of preventing malfunction of the device or destruction of elements due to electrostatic discharge, in a switch in which the movable contact piece 2 covers the fixed contact 3b as in the embodiment shown in FIG. Since it becomes difficult for noise to enter 3b and, accordingly, noise does not enter internal element 9, malfunction of the device due to noise can be prevented.

〔Effect of the invention〕

As explained above, according to the present invention, the first
By displaying markings on the terminals, the terminals can be easily identified and can be correctly connected to the input device. Further, by connecting the ground side or the power supply side of the input device to the first terminal of the switch, malfunction of the device and destruction of internal elements due to electrostatic discharge can be prevented.

[Brief explanation of drawings]

Figure 1 (al, (bl) is a sectional view of a switch according to the present invention and a connection diagram of an input device, Figure 2 (al, (b) and Figure 3 (a), (b) are other embodiments of the switch. FIGS. 4 fa+, (bl) and FIGS. 7 is a connection diagram of each of the input devices, and FIG. 7 tM+ is a sectional view of a conventional switch and a connection diagram of the input device. l...operation button, 2...movable contact piece, 3a, 3b・
...Fixed contact, 4...Casing, 5 River first terminal, 6
...Second terminal, 7...Marking, 8...Switch, 9...Internal element. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A switch comprising a first terminal electrically connected to a movable contact piece operated by an external operation, and a second terminal serving as a signal output terminal constituting a switch between the first terminal and the first terminal. A switch characterized in that terminals display markings that can be easily identified. (2) An input device using a switch, which includes a first terminal that conducts with a movable contact piece that is operated by an external operation, and a second terminal that serves as a signal output terminal that constitutes a switch between the first terminal and the first terminal. An input device characterized in that the first terminal is connected to a ground side or a power source side of the input device.