JP4118380B2 - Push button switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pushbutton switch that can be used to detect the open / closed state of a lid of a small device such as a cellular phone or a notebook personal computer.
[0002]
[Prior art]
Conventionally, a switch called a limit switch or the like has been widely used as a switch for detecting an open / close state of a lid. Many switches called limit switches have a structure that snaps to a spring contact piece as a method of driving a movable contact.
[0003]
[Problems to be solved by the invention]
Since the conventional limit switch has a complicated contact driving structure, there is a disadvantage that the shape cannot be reduced. In addition, since the movable stroke of the operation element (push button) is large, it is not suitable for use as a switch for detecting the opening / closing of a lid of a small device such as a mobile phone or a notebook personal computer.
[0004]
An object of the present invention is to provide a pushbutton switch suitable for use as a switch for detecting the opening and closing of a lid of a mobile phone or a notebook personal computer because the shape is small and the stroke of the pushbutton can be reduced. It is.
[0005]
[Means for Solving the Problems]
An insulating body that is formed into a box shape with one surface being an open surface by an insulating material, and a pair of contacts that should be electrically connected to and separated from the inner bottom surface of the box shape are exposed;
A lever whose one end is pivotally supported inside the insulating body and the other end is supported to be raised and lowered with respect to the bottom surface;
A substrate portion formed of a conductive spring material and provided with a contact portion that contacts one of the contact points disposed and exposed along the bottom surface;
A biasing spring portion that pivots and biases the rotating free end of the lever that is cut and raised from the substrate portion and supported by the insulating body so as to be raised and lowered; and
A movable contact piece protruding from the rotating free end of the biasing spring portion toward the bottom surface of the insulating body and contacting the other of the pair of contacts;
Formed integrally with the insulating body on the bottom surface of the insulating body and projecting into the tilting passage of the movable contact piece. When the movable contact piece is tilted together with the biasing spring portion, the movable contact piece engages with the movable contact piece to play the movable contact piece. An insulation protrusion that releases the end from contact with the contact;
A push button formed at the rotating free end of the lever;
A metal cover that has an opening through which the push button passes, and covers the opening surface of the insulating body;
The push button switch is constituted by the above.
[0006]
According to the pushbutton switch of the present invention, the movable contact piece engages with the insulating protrusion, and the contact portion of the movable contact piece is forcibly separated from the contact point. By this operation, the push button can open the contact between the contacts with a small stroke.
Furthermore, the movable contact side, the biasing spring portion that pivots and biases the lever in one direction, the movable contact piece, and the contact portion that always keeps the movable contact piece in contact with one terminal are integrated by a conductive spring material. Since it is molded, the internal structure is simplified, and the shape can be made small.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 13 show an embodiment of a pushbutton switch according to the present invention. FIG. 1 shows a state in which the push button 1 protrudes from the opening 3 of the metal cover 2 and the movable contact piece 4 is on. FIG. 2 shows a state in which the push button 1 is pushed into the insulating body 5 and the movable contact piece 4 is turned off. Here, the feature of the present invention is that the movable contact piece 4 rides on the insulating protrusion 6 and is forced to be turned off as shown in FIG. The structure of each part will be described in detail below.
[0008]
As shown in FIGS. 4 and 5, the insulating body 5 is formed in a box shape with one surface being an opening surface 5A (see FIG. 5), and contacts 7 and 8 are exposed on the bottom surface as shown in FIG. Is done. So-called insert contact points 7 and 8 for forming the insulating body 5 in advance is inserted into the pre-resin molding die contacts 7 and 8, the resin in this state is injected into a mold when molding the insulating body 5 It is mounted on the bottom surface of the insulating body 5 by molding.
[0009]
Two terminals 7A and 7B are led out from the contact 7 and one terminal 8A is led out from the contact 8 to be connected to, for example, a printed circuit board. Reference numeral 5B denotes a concave portion formed on the bottom surface 5C, and a reinforcing projection 9A formed at the rotating free end portion of the biasing spring portion 9 is inserted into the concave portion 5B as shown in FIG.
6 to 8 show the structures of the movable contact piece 4, the biasing spring portion 9, and the substrate portion 11. The substrate part 11, the biasing spring part 9 and the movable contact piece 4 are integrally formed of a conductive spring material. The substrate portion 11 is arranged along the bottom surface 5C of the insulating body 5 and brings the bent portion 11A into contact with the contact 7 and keeps the movable contact 4 electrically connected to the contact 7. A bent portion 11B is formed at an end portion of the substrate portion 11, this bent portion 11B is brought into contact with one short side wall 5D-3 of the insulating body 5, and the bent portion 11B is moved by an axis of a lever 12 which will be described later. Hold down and fix the mounting position.
[0010]
The biasing spring portion 9 is cut and raised from the substrate portion 11 and the free end thereof is biased and held at a position away from the substrate portion 11 (see FIG. 7), and the lever 12 is pivotally biased to this biased position.
As shown in FIGS. 9 and 10, the lever 12 is formed such that a rotating shaft 12A is formed on one end side and the push button 1 protrudes on the other end side. With the substrate portion 11 disposed along the bottom surface 5C of the insulating body 5, the rotating shaft 12A of the lever 12 is inserted into the space surrounded by the ridges 5D-1 and 5D-2 and the short side wall 5D-3. As a result, the lever 12 is pivoted and biased to the biasing position of the biasing spring portion 9, and the substrate portion 11 is further held by the bent portion 11 </ b> B to the short side wall 5 </ b> D- 3 by the pivot shaft 12 </ b> A of the lever 12. The position is fixed. In this state, the metal cover 2 is put on the opening surface 5A of the insulating body 5 to prevent the lever 12 from being pulled out.
[0011]
As shown in FIGS. 11 to 13, the metal cover 2 includes a lid portion 2A that covers the opening surface 5A of the insulating body 5, and a side surface portion 2B that is bent from both sides of the lid portion 2A and engages the side surface of the insulating body 5. And a bottom surface portion 2C that is further extended from the side surface portion 2B and engages with the bottom surface of the insulating body 5.
The lid 2A is formed with an opening 3 for projecting the push button 1 and a launch 2D formed so as to project toward the inside of the insulating body 5, and the pivot 12A of the lever 12 is held down by the launch 2D. It is configured to be rotated without rattling.
[0012]
As apparent from the structure described above, since the movable contact piece 4 is in contact with the contact 8 in the state shown in FIG. 1, the contacts 7 and 8 are electrically connected.
When the push button 1 is pressed from this state, the movable contact piece 4 tilts, and the insulating protrusion 6 is disposed on the tilt passage. Therefore, the movable contact piece 4 engages with the insulating protrusion 6 and the contact portion contacts the contact point. 8 is forcibly switched off.
[0013]
FIG. 14 shows a modified embodiment of the present invention. In this embodiment, the rotary shaft 12A of the lever 12 is engaged with the stepped portion and supported on the upper surface side of the insulating body 5, and the support button of the rotary shaft 12A is moved to obtain a longer stroke of the push button 1. An embodiment configured as follows is shown.
In this embodiment, a part of the bent portion 11B of the substrate portion 11 is folded back to form an engaging portion 11C, and this engaging portion 11C is engaged with the rotating shaft 12A of the lever 12, as shown in FIG. The substrate portion 11 is prevented from rotating in the clockwise direction by the reaction force received from the insulating protrusion 6 during the off operation. Other structures are the same as those described with reference to FIGS.
[0014]
【The invention's effect】
As described above, in the present invention, the movable contact piece 4 is not structured to contact and separate from the contact 8 by the sliding operation, but the contact portion is structured to contact and separate by the seesaw motion. However, the movable contact piece 4 can be moved toward and away from the contact 8. Therefore, there is an advantage that the stroke of the push button 1 for switching from the on state to the off state can be reduced.
[0015]
In addition, since the substrate portion 11, the biasing spring portion 9, and the movable contact piece 4 to be mounted inside the insulating body 5 are formed by punching from a single conductive spring material, the structure is simple and the assembly is easy. There is an advantage that the shape of the switch can be reduced.
By the way, the push button switch that the present applicant plans to manufacture has a thickness of about 2 mm, a length of 4 mm, a width of 3 mm, and a stroke of the push button 1 of 1 mm. It is used as a switch for detecting the card or a switch for detecting the insertion of a cash card.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining an on state of a pushbutton switch according to the present invention.
FIG. 2 is a cross-sectional view for explaining an off state of a push button switch according to the present invention.
FIG. 3 is a plan view for explaining the inside of the insulating body by removing the metal cover of the pushbutton switch according to the present invention.
FIG. 4 is a plan view for explaining the structure of an insulating body used for the pushbutton switch of the present invention.
FIG. 5 is a side view of FIG. 4;
6 is a plan view for explaining the structure of a substrate portion, a bias spring portion, and a movable contact piece 4 used in a pushbutton switch according to the present invention. FIG.
7 is a side view of FIG. 6. FIG.
8 is a front view of FIG. 6. FIG.
FIG. 9 is a plan view for explaining the structure of a lever used in the present invention.
10 is a side view of FIG. 9. FIG.
FIG. 11 is a plan view for explaining the structure of a metal cover used in the present invention.
12 is a side view of FIG.
13 is a front view of FIG. 11. FIG.
FIG. 14 is a sectional view showing a modified embodiment of the present invention.
15 is a cross-sectional view for explaining the operation of the embodiment shown in FIG. 14;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Push button 2 Metal cover 3 Opening 4 Movable contact piece 5 Insulation body 6 Insulation protrusion 7, 8 Contact 9 Bias spring part 11 Substrate part 12 Lever

Claims (1)

A. An insulating body that is formed into a box shape with one surface being an open surface by an insulating material, and a pair of contacts that should be electrically connected to and separated from the inner bottom surface of the box shape are exposed;
B. A lever whose one end is pivotally supported inside the insulating body and the other end is supported to be raised and lowered with respect to the bottom surface;
C. A substrate portion that is formed of a conductive spring material and includes a contact portion that is disposed along the bottom surface and contacts the exposed one contact;
D. A biasing spring portion that pivots and biases the rotating free end of the lever that is cut and raised from the substrate portion and supported by the insulating body so as to be raised and lowered;
E. A movable contact piece that protrudes from the rotating free end of the biasing spring portion toward the bottom surface of the insulating body and contacts the other of the pair of contacts in a state where the lever is not pressed against the lever. When,
F. The movable contact piece is formed integrally with the insulating body on the bottom surface of the insulating body, protrudes from the tilt passage of the movable contact piece, and works in a direction approaching the bottom surface. An insulating protrusion that engages with the movable contact piece to release the free end of the movable contact piece from contact with the contact when tilted with
G. A push button formed at the rotating free end of the lever;
H. Comprising an aperture for passing the push button, and a metal cover to cover the opening surface of the insulating body,
A push button switch characterized by comprising:

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