JPH0963416A - Operation electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly reduce the number of part items and assembling manhours for assembling a set by mounting an operation electronic part used in various electric and electronic apparatuses on a wiring board to obtain the operation electronic part simultaneously earthed. SOLUTION: In an operation electronic part 24, a live electric part 2 and an earth part 22 are provided on an integral conductive metal plate 21, and after both members are fixed to a resin-made case 23 by insert-molding, they are electrically separated, and the earth part 22 positioned between the live electric part 2 and an operating knob 6 is mounted so as to come nearest to the peripheral surface of a set. Therefore, even when another metal plate 9 for earth is not mounted, static electricity can be surely earthed by the operation electronic part 24 by itself, so that the number of part items and assembling manhours for assembling a set may be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation type electronic component such as an encoder and a variable resistor used in various electric / electronic devices.

[0002]

2. Description of the Related Art In recent years, as various electric and electronic devices have been downsized and reduced in price, operation type electronic parts to be used are also required to be small, highly functional and inexpensive products. In order to comply with the above, it has become necessary to facilitate the automatic assembly of electronic components, and in particular, insert molding technology is used to make contact parts and terminal parts formed by connecting them with hoop-shaped metal plates. It has become common practice to continuously insert the live parts such as the above into a case made of molded resin and supply it to an automatic assembly machine.

Hereinafter, a rotary operation type electronic part will be taken as an example of a conventional operation type electronic part, and a method of manufacturing a case in which live parts such as contact points and terminals are insert-molded and the rotary operation type electronic part will be described. The state in which is attached to the set will be described with reference to FIGS.

FIG. 4 is a plan view of a conductor of a live part formed by connecting to a hoop-shaped metal plate, and a hoop state after the conductor is continuously insert-molded in a molded resin case. FIG. 6 is a perspective view of the completed single-piece case, and FIG. 6 is a side view of the rotary operation type electronic component attached to the set.

In FIGS. 4 and 5, 1 is a conductive metal plate in the shape of a hoop having a cross section 1A, 2 is continuously punched and formed on the metal plate 1, and each is connected to the cross section 1A by a connecting section 1B. A flat plate-shaped live part 3 is a molded resin case formed by insert molding of the live part 2.

In the case 3 thus constructed, in the next step, the contact portion 2B is formed by cutting the connection portion 2A of the live part 2 and then forming the contact portion 2B, and then the crosspiece portion 1A.
The connecting portion 1B with and was cut at the cut portion 1C, and the output terminal portion 2C was bent downward to form the completed case 3 as shown in FIG.

[0007]

However, in the above-mentioned conventional configuration, the fracture surface 4 of the conductive metal plate 1 is exposed on the outer peripheral surface of the case 3 in the produced case 3, and the rotating operation assembled using the case 3 is performed. When the mold electronic component 5 is attached to the wiring board 8 of the set by protruding the operation knob 6 from the exterior wall 7 of the set as shown in FIG. 6, when the fracture surface 4 is in the vicinity of the operation knob 6, the operation is performed. There is a problem that static electricity generated when the knob 6 is operated by a finger jumps to the fracture surface 4 and affects the output signal of the rotary operation type electronic component 5 and causes a malfunction of the set. Therefore, in such an arrangement, the fracture surface 4 is covered with a separate metal plate 9 and a part of the metal plate 9 is electrically connected to the earth portion 10 of the set by soldering or the like to obtain the earth. Therefore, it has a problem that the number of parts for assembling the set and the number of assembling steps are required.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an operation type electronic component which can be grounded by simply attaching it without using a separate component.

[0009]

In order to solve this problem, in the operation type electronic component of the present invention, a conductor that is a live part and a conductor that is a ground part are provided on an integral metal plate, and both are provided. After being fixed to the resin case by insert molding, they are electrically separated, and the ground portion is arranged between the live part and the operation knob.

[0010]

With this configuration, the static electricity generated in the operation knob is always spilled to the ground portion which is the conductive material closest to the operation knob, and the operation type electronic component alone can be grounded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the present embodiment, the same parts as those described in the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a plan view of a conductor in a live part and a ground part formed by connecting to a hoop-shaped metal plate, and a hoop state after the conductor is continuously insert-molded in a molded resin case. FIG. 2 is a perspective view of a completed single-piece case, and FIG. 3 is a side view of the rotary operation type electronic component attached to the set.

In FIGS. 1 and 2, reference numeral 21 denotes a live part 2 as in the conventional example, and a crosspiece 21B and a grounding part 22 connected to the live part 2 are continuously integrated by a connecting part 21A. It is a punched hoop-shaped conductive metal plate,
Reference numeral 23 is a resin case in which the live part 2 and the ground part 22 are insert-molded.

In the case 23 thus constructed, the contact portion 2B and the terminal portion 2C of the live part 2 are formed in the next step in the same manner as in the conventional example, and the connecting portion 2 of the ground portion 22 is formed.
1A is cut at a cutting point 21C, the flat plate serving as the lightning rod portion 22A of the ground portion 22 is directed upward, and the ground terminal 22B
A flat plate to be formed is bent downward to form a case 23 in a completed state as shown in FIG.

As shown in FIG. 3, the rotary operation type electronic component 24 assembled by using the case 23 is connected to the ground terminal 22B, and the ground wiring portion 25A of the wiring board 25 is set.
If the grounding portion 22 is mounted so as to be closest to the outer peripheral surface of the set, the lightning rod portion 22A of the grounding portion 22 becomes a conductive material having a distance closest to the operation knob 6, so that static electricity is not generated. Always jumps to the lightning rod portion 22A and falls to the ground wiring portion 25A via the ground terminal 22B.
The earth can be reliably obtained without the metal plate 9 which is conventionally required.

2 and 3 for explaining the above-described embodiment, the case where the flat plate serving as the lightning rod portion 22A of the ground portion 22 is bent upward in the center and the flat plate serving as the ground terminal 22B is bent downward in the left and right directions is shown. As shown, this is the lightning rod 2
It goes without saying that the flat plate serving as 2A may be arranged on the upper left and right, and the flat plate serving as the ground terminal 22B may be arranged at the lower center.

Further, in this structure, the grounding portion 22 is disposed by being built in the operation type electronic component 24 and by forming the output terminal 2C and the grounding terminal 22B so as to project in the same direction with substantially the same size. Since the position accuracy is good, automatic mounting connection is also possible, and the effect of further reducing the assembly man-hours of the set can be obtained.

[0019]

According to the present invention, as is apparent from the above-described embodiment, grounding can be achieved only by mounting an operation type electronic component, and a live part terminal and a grounding terminal are simultaneously soldered to a wiring board. With the structure that can be attached and connected, it is possible to mount the set as an answer, and it is possible to greatly reduce the number of parts and the number of assembling steps for set assembly.

[Brief description of drawings]

FIG. 1 is a plan view of a conductor in a live part and a ground part formed by being connected to a hoop-shaped metal plate of the present invention and a hoop state after the conductor is continuously insert-molded in a molded resin case.

FIG. 2 is a perspective view of the single-piece case in the same completed state.

FIG. 3 is a side view of a rotary operation type electronic component attached to the set.

FIG. 4 is a plan view of a conductor of a live part formed by connecting to a conventional hoop-shaped metal plate and a hoop state after the conductor is continuously insert-molded in a molded resin case.

FIG. 5 is a perspective view of the single-piece case in the same completed state.

FIG. 6 is a side view of a rotary operation type electronic component attached to the set.

[Explanation of symbols]

 2 Live part 2B Contact part 2C Output terminal part 6 Operating knob 7 Exterior wall of set 21 Hoop-shaped conductive metal plate 21A Connecting part 21B Crosspiece part 21C Cutting point 22A Lightning part 22B Earth terminal part 23 Case 24 Rotating operation Type electronic parts 25 sets wiring board 25A ground wiring part

Front page continued (72) Inventor Hiroshi Matsui 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koji Tamano, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A main body in which a live part such as a terminal having a contact part is incorporated in a resin case, an operation knob for switching an electric signal generated in the live part, and an outer peripheral part of the operation knob. An operation-type electronic component comprising a grounding conductor insert-molded in the resin case so as to be arranged between the live part and the live part. 2. A live part and a grounding conductor are integrally formed of the same metal material and insert-molded in a resin case,
The operation-type electronic component according to claim 1, wherein the operation-type electronic components are electrically separated from each other after molding the resin case. 3. The operation type electronic according to claim 1, wherein the terminal for the live part and the terminal for the grounding conductor are formed so as to protrude from the resin case in substantially the same length in the same direction. parts.