JPH0325819A - Closed type push button switch - Google Patents

Abstract

PURPOSE:To prevent the deterioration of an operating touch caused by dislocation of an operating position by providing a second push button integrally with a cover plate for pushing a first button. CONSTITUTION:A second push button 12 is provided integrally with a cover plate 11 so as to push the center of a first push button 15. With this structure, even if the packaging position accuracy of a switch to a printed substrate is bad and an operating button of a set apparatus does not push the center of the switch, the second push button 12 always push the center of the first push button 15, and the first push button 15 is not inclined to prevent the deterioration of a click touch.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a small sealed pushbutton switch used as a consumer button and a switch for changing various signals in industrial electronic equipment.

6 is a side sectional view and an exploded perspective view of a sealed pushbutton switch, and FIG. 7 is a side sectional view showing the state in which the pushbutton is pressed. Figure 6, 6
In the figure, 1 is a box-shaped case made of heat-resistant resin with an opening at the top, and the bottom of the case has terminal buttons 2 and 3 for circuit connection.
An outer contact 4 and an inner contact 6, which are integral with each other, are attached by insert molding. Reference numeral 6 denotes a dome-shaped movable contact made of a thin elastic metal plate, the outer peripheral end of which is always in contact with the outer fixed contact 4. 7 is a push button for driving the movable contact 6, and its upper protrusion 7! When L is pushed down, the downward protrusion γb pushes the center part 6IL of the movable contact 6, and the dome-shaped movable contact 6 moves to the center part 6.
a is recessed and its lower surface comes into contact with the inner fixed contact 6, so that the movable contact 6 and the inner inquiry contact 5 are electrically connected, and the fixed contacts 4 and 5, that is, the terminals 2 and 3 are electrically conducted. The switch changes from open to closed.

Then, if we remove the force pushing the push button 7 from above,
The dome-shaped movable contact 6 is restored to its original shape by the elastic force of the dome-shaped movable contact 6 and is no longer in contact with the inner fixed contact 6. That is, the switch is opened again.

From a scorchable insulating sheet to a certain sealing film,
The interior of the case 1 is sealed by bonding the portion of the case 1 that contacts the opening end 1a. When a pressing force is applied to the push button 7 to operate the suinochi, the pressure is applied through the sealing film 10, so the pressed part of the film 10 is made of burnable material so that it can bend downward. It is made of a thin film.

Furthermore, 11 indicates that the sealing film 1o is at the open end of the case 1.
This cover plate is pressed down from above to prevent it from peeling off from L. It is made of a thin metal plate with elasticity fik, and has a hole in the center of its plane for applying a pressing force to the push button γ, and two holes on the sides. Folding part tip claw 11m
, 11b is a claw portion 1b provided on the outer peripheral wall of the case 1,
1c by engaging with each other.

Problems to be Solved by the Invention Generally, this type of sealed pushbutton switch is mounted on a printed circuit board using an automatic mounting machine and soldered using the reflow or Dide dipping method. However, with this soldering method, the positioning accuracy of the switch mounted on the printed circuit board is poor, and the operation button of the set equipment may not press the center of the switch, but may press eccentrically.

If you press the switch pushbutton eccentrically, the pushbutton will tilt and the switch will have a poor click feel, as shown in Figure 7.
There has been a problem in that the operating feel of the set equipment is poor and the luxury feel of the set equipment is spoiled.

The present invention has been made in view of the above-mentioned problems, and provides a sealed push button switch that does not impair the operational feel even when the position of the switch is not accurately mounted on the delint board and misalignment occurs.

Means for Solving the Problems In order to solve the above-mentioned Section 9k, the sealed pushbutton switch of the present invention has a first pushbutton portion that drives the switch by pressing the upper convex portion, which engages with the outer peripheral wall of the case. , is characterized in that a second push button is provided which is integrated with a cover plate fixed to the case.

Function The sealed pushbutton switch of the present invention has a second pushbutton that is integrated with the cover plate that presses the first pushbutton, so even if the switch is misaligned during mounting on a printed circuit board, the second pushbutton can be The push button is such that the center of the first push button is always pressed, the first push button is never tilted, and the operating feel does not deteriorate due to misalignment of the operating position.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1(&) is a sectional view of a sealed pushbutton switch according to an embodiment of the present invention, FIG. 1(b) is a perspective view thereof, and FIG. 2 is a diagram illustrating the driving state. 3 and 4 are cross-sectional views showing examples of the pond. The same numbers are assigned to parts that are the same as those in the conventional technology.
To omit the explanation, in FIG. 1, 14 is a first pushbutton switch, and a second
A push button 12 is provided integrally with the cover plate, and is arranged so as to push the center of the first push button 15.

As described above, according to this embodiment, even if the mounting position accuracy of the switch on the printed circuit board is poor and the operation button of the set equipment does not press the center of the switch, the second push button can be pressed as shown in FIG. 12 always presses the center of the first push button 15, and the first push button 16 does not tilt, so the click feel does not deteriorate.

Incidentally, in this embodiment, the second push button 12 is attached to the cover plate 11 by outsert or shaping from plastic resin, but the second push button 12 may be attached by caulking metal studs. . Alternatively, as shown in FIG.
As shown in the figure, the center portion of the 14 cover plates may be processed to form a second push button.

As described above, according to the present invention, even if the operation button of the set equipment does not press the center of the switch, the click feel is lost even if the mounting position of the sealed pushbutton switch is misaligned during surface mount soldering. The practical effects are great.

[Brief explanation of drawings]

Fig. 1C&》 is a sectional view of a sealed pushbutton 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 driving state, and Fig. 3. Fig. 4 is a sectional view showing an embodiment of the pond of the present invention, Fig. 6 is a sectional view showing a conventional sealed push button switch, Fig. 6 is an exploded perspective view of the same, and Fig. 7 is the same driving state. FIG. 1... Case, 2, 3... Terminal, 4.
5...Contact, 6...Movable contact, 7...
...First push button, 1o...Film,
11... Cover plate %12... Second push button.

Claims (2)

[Claims] (1) A box-shaped case made of insulating material with multiple fixed contacts on the bottom and an opening at the top, and electricity between the fixed contacts by being placed inside the case and being pushed at a predetermined position from above. an elastic movable contact that opens and closes the movable contact; and a first movable contact that is disposed above the movable contact in the case and has convex portions in the vertical direction so that when a predetermined position is pushed from above, the movable contact is pushed at a predetermined position. A push button, a flexible sealing film that is adhered to the end face of the case opening to seal the inside of the case, and a second push button that moves up and down when pressed and presses the upper convex part of the first push button to drive the switch. A closed type pushbutton switch that includes a pushbutton portion integrally and a cover plate that engages with the outer peripheral wall of the case and is fixed to the case. (2) The sealed pushbutton switch according to claim 1, wherein the cover plate is formed of a thin metal plate having elasticity.