JP2001319544A - Push button switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch having good isolation and small insertion loss. SOLUTION: Three fixed contact plates 32-34 in flush arrangement are embedded in an in-box bottom face 31a of a box insulating body 31. An operator 35 movable to the direction of the arrangement of the fixed contact plates is energized to the direction of the protrusion of the operator 35a to the outside of the body 31 by a coil spring 39. A movable armature 36 mounted on the operator 35 is slid on a plane of the arrangement of the fixed contact plates for making continuity between two adjacent fixed contact plates. Two both sides fixed contact plates of the fixed contact plates 32-34 are formed in the same shape and arranged symmetrically with the central fixed contact plate 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a push button switch, and more particularly to a push button switch which is built in and used in a video jack connector.

[0002]

2. Description of the Related Art A push-button switch is built in a video jack connector, and a cam that is movable with the insertion of the video jack is provided. The push-button switch is automatically operated by the cam that is movable by the insertion of the video jack. A configuration in which a signal is turned on / off by this is employed in the field of handling radio signals. As a switch used for such an application, a microswitch 11 as shown in FIG. 7 has been conventionally used.

The microswitch 11 performs contact switching by bending a fixed leaf spring 12 to perform a snap operation. The structure of the microswitch 11 will be described below. FIG.
B is a perspective view showing only the leaf spring 12 and the fixed contact, and their positional relationship and shape. Base 1 made of insulating material
3, three fixed contacts 14, 15 and 16 are implanted. The fixed contact 14 is a common (COM) contact, and as shown in the figure, the two plate-like portions 1 protruding above the base 13.
4a and 14b, and the other end protrudes from the lower surface of the base 13 to be a terminal 14c for mounting on a printed circuit board or the like.

The fixed contact 15 is an NC contact. One end of the fixed contact 15 is formed as a contact portion 15a protruding above the base 13 so as to face the base surface at a predetermined distance, and the other end is a terminal 15b. The fixed contact 16 is a NO contact, and the contact 16a at one end is disposed on the base surface so as to face the contact 15a of the fixed contact 15, and the other end is a terminal 16b. As shown in the drawing, the leaf spring 12 has two continuous frame portions 12a and 12b, and a tongue piece 12c is formed integrally with the tongue piece 12c from the inner side of the front end side of the frame portion 12b.

The leaf spring 12 is attached to a fixed contact 14
The protruding end of the tongue piece 12c and the frame 1 are fitted into locking grooves 14d formed respectively on the outer surfaces of the two plate-like portions 14a, 14b.
This is performed by locking the inner side on the base end side of the base portion 2a.
b is a fixed contact 15
Contact portion 15a. Base 1
3 is covered with a cover 17, and by pressing an operation element 18 attached to the cover 17, the operation element 18 is pressed.
The leaf spring 12 is pushed by an inner end (not shown) as shown by an arrow 19, whereby the leaf spring 12 is inverted, and the contact portion 12d at the tip thereof contacts the contact portion 16a of the fixed contact 16, That is, contact switching is performed. When the pressing of the operation element 18 is released, the leaf spring 12 reverses and returns to the original state. In FIG. 7A, reference numeral 21 denotes a rubber cap.

[0006]

As described above, although the micro switch 11 is conventionally used for the push button switch built in the video jack connector, the micro switch 11 has poor isolation and insertion loss. There was a problem that was large.
These problems of poor isolation and large insertion loss are caused by the complexity of the conductive path formed by the fixed contacts 14 to 16 of the microswitch 11 and the leaf spring 12, the length of the conductive path, and the fixed contact (COM contact). This is due to the asymmetry of the arrangement of the fixed contact (NC contact) 15 and the fixed contact (NO contact) 16 with respect to 14, the magnitude of the contact resistance, and the like.

An object of the present invention is to provide a push-button switch having good isolation and low insertion loss in order to meet such a demand.

[0008]

According to the first aspect of the present invention, there is provided a box-shaped insulating body having an open surface, and a three-dimensionally arranged body which is embedded in the bottom surface of the body and flush with the bottom surface. One fixed contact plate, an operator that is movable in the arrangement direction of the fixed contact plates and is housed in the body, one end of which protrudes outside from the side surface of the body, and an array of fixed contact plates attached to the operator. A movable contact piece that slides on the surface to electrically connect two adjacent fixed contact plates, a spring that is housed in the body and urges the operator in a direction to protrude to the outside, and covers an open surface of the body. A lid is formed integrally with each of the fixed contact plates, and includes a terminal protruding on the other surface of the body with respect to the one surface. The three fixed contact plates have two fixed contact plates on both sides thereof. Same shape and symmetric with respect to the central fixed contact plate It is placed.

According to a second aspect of the present invention, in the first aspect, the body and the lid are covered with a metal frame.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention, and FIGS. 2 to 6 show the configuration of each part (excluding a part thereof). First, the configuration of each unit will be described with reference to FIGS. As shown in FIG. 2, the insulating body 31 is formed in a box shape having a substantially rectangular parallelepiped shape with one surface opened.
Two fixed contact plates 32, 33 and 34 are arranged. These fixed contact plates 32 to 34 are insert-molded into a body 31 made of a resin material and embedded so that the surface thereof is flush with the bottom surface 31a, and are arranged linearly along the longitudinal direction of the body 31. Have been.

Each of the fixed contact plates 32 to 34 has a rectangular plate shape, and two fixed contact plates 33 and 34 located on both sides have the same shape. In addition, these fixed contact plates 33,
Reference numeral 34 is symmetrically arranged with respect to the fixed contact plate 32 located at the center. As shown in the drawing, each of the fixed contact plates 32 to 34 is integrally formed with a pair of extending portions projecting in the plate surface direction, and one of them is led out of the body 31 to open the open surface of the body 31. 32 bent at a right angle in the opposite direction to the lower surface 31b side of the body 31
a, 33a and 34a.

A rectangular notch 31c is formed on a side wall located on one short side of the body 31, and a semicircular notch 31d is formed at the bottom thereof. As shown in FIG.
e is formed. The lower surface 31b of the body 31 has a projection 31f for positioning when mounted on a printed circuit board or the like.
Are formed. FIG. 3 shows an operation element 35 housed in the body 31. The operation element 35 has an operation portion 35a having one end formed in a shaft shape, and the other end following the operation portion 35a has an outer shape. It has a rectangular parallelepiped shape, and a circular hole 35b is formed in the end face thereof. A concave portion 35c is formed on the lower surface of the rectangular parallelepiped portion, and a projection 35d is formed at the center of the concave portion 35c.

FIG. 4 shows a movable contact piece 36 attached to the operation element 35. The movable contact piece 36 is made of a metal plate having a spring property, and has a base 36a and the base 36a.
And a pair of legs 36b which are bent and extended from both sides to form a C-shape. The base 36a is provided with a hole 36c that fits with the protrusion 35d of the operation element 35, and the legs 36b are each bifurcated. FIG. 5 shows a lid 37 that covers the open surface of the body 31. A semicircular notch 37a is formed in a portion of the body 31 that faces the semicircular notch 31d.

FIG. 6 shows a metal frame 38 that covers the body 31 and the lid 37. The metal frame 38 is formed in a box shape in which a portion corresponding to the lower surface 31b of the body 31 is opened by bending a metal plate.
Notches 38a for escape are respectively formed in portions corresponding to the terminals 32a, 33a and 34a protruding therefrom, and a notch 38b is formed in a portion from which the operating portion 35a of the operating element 35 is led out. Further, four caulking pieces 38c are formed for caulking the body 31. In the drawing, reference numeral 38d denotes a terminal for ground connection.

As shown in FIG. 1, each of the components is assembled by attaching a movable contact piece 36 to an operation element 35,
One end of the coil spring 39 is inserted into the hole 35b, and these are assembled into the body 31.
The packing 41 fitted to 5a is positioned in the concave portion 31e of the body 31, the open surface of the body 31 is covered with the cover 37 in this state, and the metal frame 38 is attached. The operating element 35 has a notch 31d of the body 31 and a notch 37 of
a, protruding outside through an opening defined by
The coil spring 39 is in a state of being urged in a direction to protrude to the outside. In this state, the two leg portions 36 of the movable contact piece 36
b is elastically contacted with the fixed contact plates 32 and 33, respectively, as shown in FIG. 1B.

The metal frame 38 is fixed by bending the four caulking pieces 38c into concave portions 31g formed on the lower surface 31b of the body 31 and caulking. In the push button switch 42 assembled as described above, the operating element 35 has the fixed contact plates 32 to
34, the movable contact piece 36 slides on the bottom surface (fixed contact plate arrangement surface) 31a.

When the operating portion 35a is not operated, the movable contact piece 3
6, the adjacent two fixed contact plates 32 and 33 are electrically connected to each other. On the other hand, when the operating portion 35a is pressed in the direction of the arrow 43, the movable contact piece 36 is moved and the fixed contact plates 32 and 34 are electrically connected. You. That is, in this configuration, the fixed contact plate 32 is a common (COM) contact, the fixed contact plate 33 is an NC contact, and the fixed contact plate 34 is a NO contact. When the pressing is released, the state returns to the original conduction state.

In the push-button switch 42 having the above-described configuration, the conductive path formed by the fixed contact plates 32 to 34 and the movable contact piece 36 has a simple configuration, a short length, and three switches. Fixed contact plates 32-34
Are arranged on a straight line, and a fixed contact plate (COM contact) 32
The fixed contact plate (NC contact) 33 and the fixed contact plate (N
O contact) 34 and the movable contact piece 36 is located only on the fixed contact plate in which the movable contact 36 is conducted, so that a switch having excellent isolation and extremely small insertion loss is obtained. be able to.

Further, the simple structure facilitates downsizing. By providing the metal frame 38 as shown in this example, external noise can be cut off, that is, a good shielding effect can be obtained.

[0020]

As described above, according to the present invention, it is possible to obtain a push-button switch having good isolation and a small insertion loss. It is possible to provide a switch having greatly improved performance as compared with the switch 11, and it is possible to satisfactorily turn on / off a high frequency signal such as 2.5 GHz for high definition broadcasting.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, wherein A and B are cross-sectional views, C is a left side view, and D is a bottom view.

2A is a plan view of the body in FIG. 1, B is a sectional view thereof, C is a left side view thereof, and D is a bottom view thereof.

3A is a plan view of the operator in FIG. 1, B is a sectional view thereof, C is a left side view thereof, and D is a bottom view thereof.

4A is a plan view of the movable contact piece in FIG. 1, and FIG. 4B is a front view thereof.

5A is a plan view of the lid in FIG. 1, B is a sectional view thereof, C is a left side view thereof, and D is a bottom view thereof.

6A is a front view of the metal frame in FIG. 1, B is a left side view thereof, and C is a bottom view thereof.

7A is an exploded perspective view showing a conventional example, and FIG. 7B is a perspective view showing only a conductive path portion thereof.

Claims (2)

[Claims] 1. A box-shaped insulating body having an open surface, three fixed contact plates arranged on the bottom surface of the inside of the body and flush with the bottom surface, and an arrangement direction of the fixed contact plates. An operation member which is movably accommodated in the body and one end of which is protruded from a side surface of the body to the outside, and which is attached to the operation member and slides on the fixed contact plate arrangement surface, and the fixed contact A movable contact piece that connects two adjacent plates to each other, a spring that is housed in the body and biases the operation element in a direction to protrude to the outside, a lid that covers an open surface of the body, and each of the fixed members Each of the three fixed contact plates is formed integrally with the contact plate and protrudes to the other surface side of the body with respect to the one surface. Symmetrically with respect to the fixed contact plate Push-button switch which is characterized in that it is. 2. The push button switch according to claim 1, wherein the body and the lid are covered with a metal frame.