JP2754750B2 - Sealed pushbutton switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small hermetic pushbutton switch used as a switch for switching various signals of consumer and industrial electronic devices.

5 and 6 are a side sectional view and an exploded perspective view of a closed type push button switch, and FIG. 7 is a side sectional view showing a state where a push button is pressed. 5 and 6, reference numeral 1 denotes a box-shaped case made of a heat-resistant resin having an opening at an upper part, and has an outer contact 4 and an inner contact 5 integrated with circuit connection terminals 2 and 3 on the bottom surface thereof. Are attached by insert molding. Reference numeral 6 denotes a dome-shaped movable contact made of an elastic metal thin plate. Reference numeral 7 denotes a push button for driving the movable contact 6. The upper projection 7 a is pushed down and the lower projection 7 b pushes down the central portion 6 a of the movable contact 6 so that the dome-shaped movable contact 6 is moved to the center. When the portion 6a is recessed and comes into contact with the inner fixed contact 5 on the lower surface side,
The movable contact 6 and the inner fixed contact 5 are electrically connected, and the fixed contacts 4 and 5, that is, the terminals 2 and 3 are electrically connected, so that the switch is changed from the open state to the closed state.

Then, when the force pressing the push button 7 from above is removed, the dome-shaped movable contact 6 is restored to its original shape by its elastic force, and the contact with the inner fixed contact 5 is lost. That is, the switch is opened again.

10 is a sealing film made of a flexible insulating sheet,
The inside of the case 1 is hermetically sealed by bonding a portion in contact with the open end surface 1a of the case 1. When a push force is applied to the push button 7 to operate the switch, the push button 7 is pushed through the sealing film 10, so that the film 10
The pressed portion is made of a thin film that is flexible so that it can bend downward.

Reference numeral 11 denotes a cover plate which is pressed down from above to prevent the sealing film 10 from peeling off from the open end surface 1a of the case 1. The cover plate 11 is made of an elastic metal thin plate. In addition to the above, there are two holes on the outer peripheral wall of the case 1 and the front end claws 11a and 11b of the bent portion are fixed by engaging with the claws 1b and 1c provided on the outer peripheral wall of the case 1, respectively.

Generally, this type of hermetic push button switch is mounted on a printed circuit board by an automatic mounting machine and soldered by a reflow or dip dipping method. However, in this soldering method, the position accuracy when the switch is mounted on the printed circuit board is poor, and the operation button of the set device may not be pressed at the center of the switch but may be pressed eccentrically.

When the push button of the switch is pressed eccentrically, as shown in FIG. 7, the push button is tilted, the click feeling of the switch is poor, the operation feeling of the set device is deteriorated, and the luxury of the set device is impaired. Was.

The present invention has been made in view of the above problems, and has as its object to provide a hermetic push-button switch in which the mounting position accuracy of the switch on a printed circuit board is poor and the operation feeling is not impaired even when the position is misaligned.

Means for Solving the Problems In order to solve the above problems, a sealed push button switch of the present invention engages with a first push button portion for driving the switch by pressing an upper convex portion and an outer peripheral wall of a case. And a second push button formed by processing a central portion of a cover plate fixed to the case.

The closed push button switch of the present invention has the second push button integrated with the cover plate for pressing the first push button, so that even when the switch is displaced when mounted on a printed circuit board, the first push button is closed. The second push button always presses the center of the first push button, the first push button does not tilt, and the operation feeling is not deteriorated due to the displacement of the operation position.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a sectional view of a closed type push button switch according to an embodiment of the present invention, FIG. 1B is a perspective view of the same, and FIG. 2 is a view for explaining the same driving state. FIG. 3 and FIG. 4 are cross-sectional views showing another embodiment. The same reference numerals are given to the same parts as those in the prior art, and the description will be omitted. In FIG. 1, reference numeral 14 denotes a first push button switch.
The push button 12 is provided by processing a central portion of the cover plate, and is configured to press the center of the first push button 15.

As described above, according to the present embodiment, even if the mounting position accuracy of the switch on the printed circuit board is poor and the operation button of the set device does not press the center of the switch, the second push button as shown in FIG. 12 always presses the center of the first push button 15 and the first push button 15 does not tilt, so that the click feeling does not deteriorate.

In the present embodiment, the second push button 12 is outsert molded with a plastic resin and attached to a portion obtained by punching and bending a central portion of the cover plate 11, but the second push button 12 is made of metal. Tack May be attached. Alternatively, as shown in FIG. 3, the center of the thirteenth cover plate may be bent to form a second push button.
As shown in FIG. 4, a central portion of the fourteen cover plates may be subjected to a shivering process to form a second push button.

Effect of the Invention As described above, according to the present invention, the click feeling is lost even when the operation button of the set device does not press the center of the switch against the mounting position shift at the time of surface mounting soldering of the sealed push button switch. The practical effect is great.

[Brief description of the drawings]

1 (a) is a sectional view of a closed type push button switch according to an embodiment of the present invention, FIG. 1 (b) is a perspective view thereof, FIG. 2 is a sectional view illustrating the same driving state, and FIG. And FIG. 4 are cross-sectional views showing another embodiment of the present invention, FIG. 5 is a cross-sectional view showing a conventional closed type push button switch, FIG. 6 is an exploded perspective view thereof, and FIG. It is sectional drawing explaining a state. 1 ... Case, 2,3 ... Terminal, 4,5 ... Contact, 6 ... Movable contact, 7 ... First push button, 10 ... Film, 11 ...
Cover plate, 12 ... Second push button.

Claims (2)

(57) [Claims] 1. A box-shaped case made of an insulating material having a plurality of fixed contacts on a bottom surface and having an opening at an upper portion, and is disposed in the case and pressed at a predetermined position from above so that the fixed contacts are separated from each other. An elastic movable contact for electrically opening and closing the movable contact; anda second movable contact disposed in the case and having a convex portion in a vertical direction so as to push a predetermined position of the movable contact by being pushed from above. 1, a push-button, a flexible sealing film adhered to the end of the case opening to seal the inside of the case, and the upper part thereof is pressed to move up and down to push the upper convex part of the first push-button to switch. A closed type push button switch comprising: a second push button to be driven; a center portion of which is formed by machining the center portion thereof; 2. The sealed push-button switch according to claim 1, wherein the cover plate is formed of a thin metal plate having elasticity.