JP3614645B2 - Electrical component - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrical component suitable for use in a semi-fixed variable resistor.
[0002]
[Prior art]
As shown in FIG. 7, a conventional electrical component, for example, a variable resistor, has a flat insulating substrate 31 made of synthetic resin, a contact piece 32 embedded in the insulating substrate 31, a support shaft 33, and a support. A terminal 34 attached by a shaft 33 and a metal cover 35 are attached.
The rotating body 36 made of synthetic resin has a shaft portion 36a and a circular base portion 36c provided with a concave portion 36b. A resistor 37 and a good conductor 38 are formed on the lower surface of the base portion 36c. ing.
The rotating body 36 is configured by inserting the support shaft 33 into the recess 36 b, projecting the shaft portion 36 a from the hole 35 a of the cover 35, and disposing the leaf spring 39 between the base portion 36 c and the cover 35. Yes.
[0003]
When the rotating body 36 is attached, the rotating body 36 is rotatably held by the support shaft 33 and the cover 35, and the contact piece 32 embedded in the insulating substrate 31 contacts the resistor 37, and the plate The rotating body 36 is pushed by the spring 39, and the good conductor 38 is in contact with the support shaft 33.
When such an electrical component rotates the shaft portion 36 a of the rotating body 36, the rotating body 36 rotates with the support shaft 33 and the cover 35 as a guide, and the good conductor 38 is in contact with the support shaft 33. The resistor 37 slides on the contact piece 32 to adjust the resistance value.
[0004]
[Problems to be solved by the invention]
However, the contact piece 32 of the conventional electrical component is embedded in the flat insulating substrate 31 only at the tip thereof, and the main body of the contact piece 32 is provided on the rotating body 36 so as to protrude from the upper surface of the insulating substrate 31. Since the contact is made with the resistor 37, the gap between the insulating substrate 31 and the rotating body 36 becomes large, and it is difficult to obtain a sufficient contact pressure of the contact piece 32.
In addition, the large gap becomes an extra dead space, and there is a problem that the electrical component becomes large.
Further, since the contact piece 32 is in a state of being extended from its upper surface in the insulating substrate 31, the length of the elastic arm portion of the contact piece 32 cannot be taken sufficiently, and the electric power in a stable contact state is obtained. There is a problem that parts cannot be obtained.
In addition, the support shaft 33, the cover 35, and the leaf spring 39 are required to hold the rotating body 36, and there are problems that the number of parts increases, the size is large, the cost is high, and the productivity is poor.
[0005]
[Means for Solving the Problems]
As a first solving means for solving the above-mentioned problems, a support member made of an insulating material, having a recessed portion in the central portion and having a side wall, a contact member made of a metal plate and having a base portion and a contact portion , A rotating body composed of an insulating material, a good conductor, a resistor, and the like, including a conductive pattern formed on the rotating body, and a support shaft that rotatably holds the rotating body, It is arranged on the upper end surface side of the support member and is rotatably held by the support member by the support shaft, and when the rotating body rotates, the conductive pattern is in sliding contact with the contact portion of the contact member, The contact member is mounted with the base portion embedded in the support member, exposed at the upper end surface of the side wall, and bent at the upper end surface of the side wall from the outside to the inside of the support member. Part An internal of the support member has a configuration which is adapted to be positioned in the recess portion.
As a second solution, the contact portion is formed in an arc shape .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An electrical component of the present invention, for example, a semi-fixed type variable resistor will be described with reference to the drawings. FIGS. 1 to 6 all relate to the electrical component of the present invention, FIG. 1 is a plan view of the electrical component, and FIG. Is a side view of the electrical component, FIG. 3 is a cross-sectional view of the electrical component, FIG. 4 is a diagram showing a support member of the electrical component, A is a bottom view, B is a plan view, and FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5B.
[0007]
Next, the variable resistor, which is an electrical component of the present invention, will be described with reference to FIGS. 1 to 6. The support member 1 made of a synthetic resin insulating material has a hollow portion 1 a provided in the central portion and one outer periphery. The support member 1 includes a side wall 1c constituting a stopper portion 1b provided on the side, a recess 1d provided on the upper end surface of the side wall 1c, and a bottom wall 1e formed integrally with the side wall 1c. The support shaft 2 made of a metal plate and a pair of contact members 3 and 4 made of a spring metal plate are embedded and integrated.
The support shaft 2 is formed by drawing, and includes a shaft portion 2d having a shoulder portion 2c between the large diameter portion 2a and the small diameter portion 2b, and a terminal portion 2e.
The pair of contact members 3 and 4 includes a base portion 3a and 4a, contact portions 3b and 4b extending in an arc from one end of the base portions 3a and 4a, and a terminal portion 3c extending from the other end of the base portions 3a and 4a. , 4c.
[0008]
Then, the support shaft 2 and the pair of contact members 3 and 4 are attached to the support member 1 by placing the support shaft 2 and the contact members 3 and 4 in a state as shown in FIG. As shown in B, the support member 1 is formed by molding a synthetic resin, and the bases 3 a and 4 a of the support shaft 2 and the contact members 3 and 4 are embedded in the bottom wall 1 e of the support member 1.
After embedding, the support shaft 2 is bent at a right angle along the line S1 in FIG. 5A, and the contact member 3 is bent at a right angle at the line S2 and is bent at 180 degrees at the line S3. The contact member 4 is positioned within the recess 1a of the support member 1, and the contact member 4 is bent at a right angle along the line S4 and at 180 degrees along the line S5, so that the contact portion 4b is positioned within the recess 1a of the support member 1. Is manufactured.
Further, the contact members 3 and 4 manufactured in this way are exposed at the upper end surface in the recess 1e of the side wall 1c of the support member 1 as shown in FIG. The arc-shaped contact portions 3b and 4b are positioned in the hollow portion 1a which is the inside of the support member 1 and are arranged in a state of being bent from the outside to the inside.
[0009]
The rotating body 5 made of a ceramic material has an octagonal shape, a through hole 5a provided at the center, a cross-shaped driver groove 5b provided on the upper surface, and an outer peripheral portion of the cross-shaped driver groove 5b. Has a flat surface 5c formed on the upper surface so as to surround and a stopper portion 5d provided on the side portion.
As shown in FIG. 4, a conductive pattern 8 comprising a resistor 6 and a good conductor 7 such as a silver paste is formed on the lower surface of the rotating body 5.
The good conductor 7 has a good conductor 7a formed on the outside with the resistor 6 interposed therebetween and a good conductor 7b formed on the inside. The good conductor 7a on the outside is composed of the resistor 6. The good conductor 7b on the inner side is connected to the other end of the resistor 6, and is formed in a conductive state in the through hole 5a and around the through hole 5a.
[0010]
Such a rotating body 5 is arranged on the upper end surface side of the support member 1 so that the small diameter portion 2b of the support shaft 2 passes through the through hole 5a, and the tip end portion of the small diameter portion 2b that is the support shaft 2 is screwed. It caulks around the through hole 5a on the bottom surface of the groove 5d and is rotatably attached to the support shaft 2.
Since the rotating body 5 is held by the bottom surface of the driver groove 5d, the space for inserting the driver can be made sufficiently large. In this embodiment, the tip end portion of the small diameter portion 2b is crimped. However, instead of caulking, a speed nut (not shown) is press-fitted into the small-diameter portion 2b, and the rotating body 5 is attached to the support shaft 2. In this case as well, since the rotating body 5 is held by the bottom surface of the driver groove 5d, the space for inserting the driver can be increased.
And in the state which this rotary body 5 was attached, while the rotary body 5 covered a part of recessed part 1d of an upper end surface, while the good conductor 7b was pressed and contacted to the shoulder part 2c of the spindle 2, The good conductor 7b formed in the through hole 5a is also in contact with the small diameter portion 2b, the contact portion 3b of the contact member 3 is in contact with the resistor 6, and the contact portion 4b of the contact member 4 is in the outer good conductivity. It will be in the state which contacted the body 7a.
[0011]
In such an electrical component, when a driver is inserted into the driver groove 5b of the rotating body 5 and the rotating body 5 is rotated, the inner good conductor 7b is in contact with the support shaft 2 and the outer good conductor is in contact. 7a is in contact with the contact member 4, and the resistor 6 is in sliding contact with the contact member 3 to adjust the resistance value between the terminal portion 3c and the terminal portion 4c and between the terminal portion 3c and the terminal portion 2e.
Then, when the stopper portion 5d of the rotating body 5 hits the stopper portion 1b of the support member 1, the rotation of the rotating body 5 is stopped.
Further, the assembly of the rotating body 5 in such an electrical component is performed by sucking the flat surface 5c of the rotating body 5 by a vacuum (not shown), moving the rotating body 5 to the support member 1, and After fitting the through hole 5a of the rotating body 5 to the attached support shaft 2, the end portion of the support shaft 2 is crimped, and the assembly is completed, and assembly by automation can be performed.
[0012]
【The invention's effect】
In the electrical component of the present invention, the contact members 3 and 4 are arranged so that the bent support portions are positioned on the upper end surface of the side wall 1c of the support member 1 and extend the contact portions 3b and 4b. Since the space | interval of the rotary body 5 can be made small, the clearance gap between the bottom wall 1e of the supporting member 1 and the rotary body 5 can be made small, there is little dead space, and a small electrical component can be provided.
Further, the contact members 3 and 4 are exposed at the upper end surface of the side wall 1c, and the upper end surface of the side wall 1c is bent inward from the outside of the support member 1 so that the contact portions 3b and 4b are connected to the inside of the support member 1. because so that is positioned within the recessed portion 1a is, by this folding, the contact portion 3b, it is possible to increase the spring of 4b, it can provide better electrical components of the contact, the height of the bent portion Can be kept low.
In addition, since the rotating body 5 having the conductive pattern 8 formed on the lower surface is rotatably attached to the support member 1 by the support shaft 2, the number of parts is small compared to the conventional case, and the size is small. In addition, it is possible to provide an inexpensive electrical component with good productivity.
Further, by making the contact portions 3b and 4b arcs, the length of the elastic arm portions of the contact portions 3b and 4b can be sufficiently increased, and an electrical component with stable contact can be provided .
[Brief description of the drawings]
FIG. 1 is a plan view of an electrical component of the present invention.
FIG. 2 is a side view of the electrical component of the present invention.
FIG. 3 is a cross-sectional view of an electrical component of the present invention.
FIG. 4 is an explanatory view showing a support member according to the electrical component of the present invention.
FIG. 5 is an explanatory view showing the production of the electric component of the present invention.
6 is a cross-sectional view taken along line 6-6 in FIG. 5B.
FIG. 7 is a cross-sectional view of a conventional electrical component.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support member 1a Indented part 1b Stopper part 1c Side wall 1d Recessed part 1e Bottom wall 2 Support shaft 2a Large diameter part 2b Small diameter part 2c Shoulder part 2d Shaft part 2e Terminal part 3 Contact member 3a Base part 3b Contact part 3c Terminal part 4 Contact member 4a Base portion 4b Contact portion 4c Terminal portion 5 Rotating body 5a Through hole 5b Driver groove 5c Flat portion 5d Stopper portion 6 Resistor 7 Good conductor 8 Conductive pattern

Claims (2)

A support member made of an insulating material, having a depression at the center and having a side wall, a contact member made of a metal plate, having a base and a contact portion, a rotating body made of an insulating material, a good conductor, and a resistor And a conductive pattern formed on the rotating body, and a support shaft that rotatably holds the rotating body , the rotating body being disposed on the upper end surface side of the support member, The conductive member is rotatably held by the support member, and when the rotating body rotates, the conductive pattern is in sliding contact with the contact portion of the contact member, and the base portion of the contact member is embedded in the support member. It is attached and exposed at the upper end surface of the side wall, and is bent at the upper end surface of the side wall from the outer side to the inner side of the support member so that the contact portion is positioned in the hollow portion inside the support member. I'll let you Electrical components, characterized in that the. The electrical component according to claim 1, wherein the contact portion is formed in an arc shape.

Images