JPH0811089Y2 - Push button switch - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) This invention proposes that a pushbutton switch provided inside a keyboard or other electronic device, in particular, a frame to which the pushbutton switch main body is fixed is a circuit board. The present invention relates to a push-button switch having a so-called vertical structure in which the pushing direction of the push-button switch and the circuit board surface are parallel when mounted.

(Prior Art) Conventionally, as shown in FIG. 7, a push-button switch mounted inside an electronic device covers an opening of a synthetic resin case 1 with a metal lid member 2 and The L-shaped projecting piece 3 is extended from the member 2, and the projecting piece 3 is brought into contact with the frame 4 fixing the case to ground. Here, as a means for bringing the projecting piece 3 into contact with the frame 4, a through hole is formed in the frame 4, and the tip portion of the L-shaped projecting piece 3 is the through hole when the case 1 is fixed to the frame 4. A means has been adopted in which the protruding portion is inserted into and is brought into contact by crimping or bending.

Further, as shown in FIG. 8, there is also one in which a lid member that closes the opening of the case and a frame that fixes the case are integrally formed.

(Problems to be Solved by the Invention) In the former case of the above conventional technique, the protruding piece 3 is attached to the frame 4
After it is inserted into the through hole, the work of bending or crimping the tip of the protruding piece 3 is required, which increases the number of work steps and is a small part. The work of machining the parts was extremely troublesome and hindered mass production and cost reduction. further,
Since the protruding piece 3 is L-shaped, when a plurality of push button switches are arranged side by side, the length thereof becomes long, which hinders downsizing of electronic devices. Further, as shown in FIG. 7, only the L-shaped protruding piece 3 of the push button switch at one end must be attached in the opposite direction. This is the frame 4 and the L-shaped protruding piece 3.
However, there is a drawback that the work efficiency is deteriorated because only one push button switch has to be attached to the frame 4 in the opposite direction.

In the latter case of the above conventional technique, as shown in FIG. 8, the surface of the case 1 on the side of the push button 6 is on the surface of the frame 5 which also serves as the lid member 2 and the frame 4 of the case 1. Since the protrusions 7 of the pushbutton 6 are simply melted and fixed, the pushbutton 6
When is pressed, a pressing force is applied to the projection 7, and the case 1 is disengaged from the frame 5 due to long-term use or strong force.

The present invention has been made in view of the above-mentioned problems of the conventional technique, and is small and lightweight, has a small number of manufacturing steps, and ensures reliable electrical connection between the lid member and the frame, and is a highly reliable push button. The purpose is to provide a switch.

[Constitution of device]

(Means for Solving the Problems) The present invention relates to a push button switch in which a synthetic resin case push button is provided and the opening of the case is closed by a metal lid member. Is provided, and the protruding piece for grounding is bent along the side surface of the case so as to be in close proximity, and is extended to the side opposite to the protruding direction of the push button.
A through hole into which the earthing protruding piece is fitted is formed in a metal frame that supports and fixes the case on the side opposite to the protruding direction of the push button, and the through hole on the side opposite to the surface on which the case is supported and fixed. A standing piece is provided at the peripheral edge of the grounding projection, and the tip of the grounding projection is inserted into the through hole in a state where the case is fixed to the frame. A push button that elastically abuts a corner portion of the mounting portion to the frame, and a surface of the tip of the grounding protruding piece opposite to the case elastically abuts the through hole and the upright piece. It is a switch. Further, a projection is formed integrally with the case at a mounting portion of the case to the frame, and the projection is inserted into a hole formed in the frame to melt a tip portion of the case to mount the case to the frame. It is a push button switch.

(Operation) In the push button switch of the present invention, it is possible to reliably ground the earth simply by elastically abutting the grounding protruding piece to the through hole and the standing piece of the frame, and it is possible to reduce the number of manufacturing steps. It also contributes to miniaturization of electronic devices.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention, in which a synthetic resin case 10 is provided with a fixed contact and a movable contact (not shown). Is urged in the protruding direction. A frame 12 fixing the case 10 is attached to the back surface of the case 10 by a protrusion 13 on the back surface of the case 10. The protrusion 13 is fitted in a predetermined hole of the frame 12 and the head is melted to join the case 10 and the frame 12 together. Further, lead terminals 14 connected to the movable contact and the fixed contact inside the case 10 extend from the case 10. On the other hand, the frame 12 is formed with mounting terminals 15 for mounting the push button switch on the circuit board.

Further, the opening of the case 10 is closed by a lid member 16 made of metal, and this lid member 16 also has a projection 17 on the surface of the case 10 as a through hole at a predetermined position of the lid member 16 like the frame 12. It is fitted and the head is melted and fixed. A grounding protruding piece 18 extends from one end edge of the lid member 16, and the grounding protruding piece 18 is opposite to the push button 11 along the side surface of the case 10 from the end edge of the lid member 16. Extending in the direction of. The grounding protruding piece 18 is slightly
Although it is distant from the side surface, it becomes closer to the case 10 as it approaches the frame 12, and abuts on a corner of the case 10 at a position where it is inserted into the through hole 19 provided in the frame 12. The case 10 is attached to a part of the peripheral edge of the through hole 19 of the frame 12.
Standing piece 20 protruding to the side opposite to the side where is attached
Is formed, and the tip end of the grounding protruding piece 18 elastically abuts on the standing piece 20.

The pushbutton switch of this embodiment is assembled by the frame 12
The protrusion 13 of the case 10 may be inserted into the through hole of the frame 12 while inserting the grounding protruding piece 18 into the through hole 19. On this occasion,
In order to elastically contact the grounding protruding piece 18 with the standing piece 20, the grounding protruding piece 18 is pushed by the corner portion of the case 10 and the protrusion 13 of the case 10 is inserted into the through hole of the frame 12.

According to the push button switch of this embodiment, the protruding piece for grounding is used.
18 is provided along the side surface of the case 10 so that the switch can be downsized, and moreover, the earth protrusion piece 18 elastically abuts the through hole 19 and the upright piece 20 of the frame 12 so that the lid member is formed. Since it has 16 grounds, it is easy to assemble and can be grounded securely. Further, since the grounding protruding piece 18 is pushed by the corner portion of the case 10 and elastically comes into contact with the through hole 19 and the upright piece 20 of the frame 12, the contacting force is strong and the elastic force during use is high. Will not get tired.

Next, a second embodiment of the present invention will be described with reference to FIGS.
Description will be made based on the drawings.

Here, the same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

This embodiment is a push button switch in which a plurality of switches are attached to the frame 22 in a line. The frame 22 is made of metal similarly to the first embodiment, and the case 10 is fixed to the frame 22 by the protrusion 13 of the case 10, and
The grounding protruding piece 18 is fitted in the through hole 29 of the frame 22. In addition, upright pieces 20 and 30 upright from the peripheral edge of the through hole 29 on the side opposite to the case 10 are provided in each through hole 29. Here, the standing piece 20 is a bent portion at both ends of the frame 22 as in the first embodiment, and the standing piece 30 is in the middle portion of the frame 22 and is cut and raised to form the through hole 29. .

Also in the push button switch of this embodiment, similarly to the first embodiment, the protrusion 13 for the ground is elastically inserted into the through hole 29 of the frame 22 while the projection 13 of the case 10 is fitted into the through hole of the frame 22. The head of the protrusion 13 is melted and fixed. Here, the grounding protruding piece 18 extends along the side surface of the case 10,
It is elastically abutted to the upright pieces 20, 30 of the frame 22 which are pushed at the corners of 10.

According to this embodiment, since the grounding protruding piece 18 extends along the side surface of the case 10, the grounding protruding piece 18 is located on the side surface portion of the case 10 at one end even if the switches are all oriented in the same direction. Without protruding, the device can be downsized, and the number of manufacturing steps and the cost can be reduced.

[Effect of device]

In the push button switch of this invention, the earth of the lid member is taken by the earth protruding piece extending from the lid member, and the earth protruding piece is fitted into the through hole of the frame along the side surface of the case to Since the tip of the grounding projection piece is elastically abutted against the standing piece of the through hole by pushing the case side surface of the grounding projection piece tip portion by the corner portion, the push button switch can be assembled. It is easy and grounding can be surely taken. Therefore, not only electrostatic noise but also chattering noise generated when the tact switch is pressed can be completely removed. Further, since the grounding protruding piece is configured to extend from the lid member along the side surface of the case, the outer shape of the switch becomes small, and there is no extra protruding portion, which contributes to downsizing of the device.

Furthermore, since the case is supported by the frame and the force in the pressing direction of the push button is received by the frame, the case of the push button switch does not come off from the frame, the ground connection is perfect, and there is no disconnection from the circuit board. It can withstand rough use for a long time.

Further, since the projection of the case is inserted into the hole of the frame and the tip of the frame is melted to fix the case and the frame, the case is firmly fixed, and the direction in which the elastic force of the grounding protruding piece acts is This is a direction orthogonal to the insertion direction of the protrusion, and the case does not come off from the frame due to the elastic force of the earth protrusion piece.

[Brief description of drawings]

1 is a plan view of a push button switch according to a first embodiment of the present invention, FIG. 2 is a front view of this embodiment, FIG. 3 is a right side view of this embodiment, and FIG. 4 is a second view of the present invention. FIG. 5 is a plan view of the push button switch of the embodiment, FIG. 5 is a front view of the second embodiment, and FIG.
FIG. 7 is a right side view of the second embodiment, FIG. 7 is a front view of a conventional push button switch, and FIG. 8 is a right side view of another conventional push button switch. 10 ... Case, 11 ... Push button, 12, 22 ... Frame, 16 ... Lid member, 18 ... Ground protruding piece, 19, 29 ... Through hole, 20, 30 ... Standing piece

Claims (2)

[Scope of utility model registration request] 1. A push button switch in which an elastic piece is provided in a synthetic resin case, has a push button biased in the protruding direction by the elastic piece, and has an opening of the case closed by a metal lid member. In this case, a grounding protruding piece is provided on this lid member, and the grounding protruding piece is bent along the side surface of the case so as to be in close proximity and is extended to the side opposite to the protruding direction of the push button. The metal frame supporting and fixing the case on one side is formed with a through hole into which the grounding protruding piece is fitted, and a standing piece is provided on the peripheral portion of the through hole on the side opposite to the surface supporting and fixing the case. When the case is fixed to the frame, the tip of the grounding projection piece is inserted into the through hole, and the case-side surface of the grounding projection piece tip is the mounting part of the case to the frame. Elastically hit the corners And, push button switch surface opposite to the case of the earth protruding piece tip, characterized in that elastically abuts on the through hole and the standing piece. 2. A protrusion is formed integrally with the case at a portion where the case is attached to the frame, and the protrusion is inserted into a hole formed in the frame to melt a tip portion of the case to attach the case to the frame. The push-button switch according to claim 1, wherein the push-button switch is characterized in that the utility model is registered.