JP2925904B2 - Rotary electrical parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric component capable of outputting by rotating a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Utility Model Laid-Open No. 58-16220, a pair of resistors connected to both ends of a resistor at the lower portion of the insulator substrate are provided on an insulating substrate having a resistor formed on its surface. A rotary type variable resistor in which a terminal is soldered, a mounting bracket having a mounting portion is fixed, and a rotating shaft having a slider is rotatably mounted so as to be orthogonal to the plate surface of the insulating substrate. Proposed.

[0003] In the rotary variable resistor constructed as described above, a terminal extending below the insulating substrate and a mounting bracket are inserted into a plurality of insertion holes of the printed circuit board, and the insulating substrate is mounted by the mounting portion of the mounting bracket. The terminal and the mounting bracket are soldered to the land portion of the printed circuit board in a state of being independent on the printed circuit board, and are mounted on the printed circuit board. In use, when the rotating shaft is rotated, the slider slides and rotates on the resistor of the insulating substrate in conjunction therewith, and the resistance value is adjusted according to the sliding contact position between the slider and the resistor. It has become.

[0004]

In the above-described conventional rotary variable resistor, since the terminal is connected to the resistor at the lower part of the insulating substrate, the resistor and the terminal are located near the surface of the printed circuit board. A space for arranging the connection part is required, and as a result, the rotating shaft must be arranged at a position sufficiently distant from the surface of the printed circuit board, and the height of the rotary variable resistor increases. there were. Further, since the connection portion is close to the surface of the printed circuit board, when soldering a terminal to a land portion of the printed circuit board, heat is easily transmitted to the connection portion via the terminal,
There was a concern that the mechanical connection of the connecting portion would be impaired due to thermal effects. Furthermore, when soldering the terminals to the lands of the printed circuit board, there is a concern that the flux may easily reach the connection portion by transmitting along the surface of the terminal, and the flux may impede the electrical connection of the connection portion. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances of the prior art, and an object of the present invention is to provide a rotary electric component suitable for thinning and having high connection reliability.

[0006]

To achieve SUMMARY OF to the above objects, the present invention includes an insulating substrate on which a circuit pattern is formed on the surface, and a pair of terminals connected to both ends of the circuit patterns, the insulating substrate A rotary shaft extending in a direction perpendicular to the rotary shaft, and a slider receiver provided integrally with the rotary shaft and having a slider that comes into sliding contact with the circuit pattern. Rotary electrical part soldered on printed circuit board
In the article , each of the terminals has an attaching portion extending from a lower end of the insulating substrate and attached to the printed circuit board, and a connecting portion between the terminal and the circuit pattern is provided on an upper portion of the insulating substrate. It is characterized by the following.

[0007]

The connection between the circuit pattern and the terminal is located above the insulating substrate, and the distance between the connection and the surface of the printed circuit board is sufficiently large. It is difficult for heat or flux to be transmitted to the connection portion via the terminal, thereby preventing the influence of heat or flux on the connection portion between the circuit pattern and the terminal. In addition, since the connection between the circuit pattern and the terminal is located above the insulating substrate, the rotating shaft can be arranged at a position close to the surface of the printed circuit board, and the height can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a rotary variable resistor according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an assembled state of the rotary variable resistor of FIG.

A rotary variable resistor according to the present embodiment shown in FIG. 1 has an insulating substrate 3 having a resistor 1 (circuit pattern) and a current collector 2 on its surface, and extends in a direction orthogonal to the insulating substrate 3. Rotating shaft 4, a slider receiver 6 provided integrally with the rotating shaft 4 and having a slider 5 facing the insulating substrate 3, and a pair of terminals connected to both ends of the resistor 1. 7, 8 and an intermediate terminal 9 connected to the upper end of the current collector 2.

The insulating substrate 3 is made of an insulating material such as ceramic or synthetic resin, and has a through hole 3a formed substantially at the center thereof, concave portions 3b, 3c, 3d formed at the lower end, and a through hole 3e formed at the upper portion. , 3f, 3g are drilled. A substantially horseshoe-shaped resistor 1 and a substantially circular current collector 2 are printed on the surface of the insulating substrate 3, and both ends of the resistor 1 are located on the periphery of the through holes 3e and 3g, respectively. The upper end of the body 2 is located on the periphery of the through hole 3f.

The slider 5 is made of a conductive metal plate having a high spring property, such as phosphor bronze or stainless steel, formed in an annular shape, and includes a first sliding piece 5a slidably in contact with the resistor 1, and a current collector. 2
A second sliding piece 5b slidingly contacting with a concave portion 3c of the insulating substrate 3
Click piece 5c that gives a sense of moderation by disengaging from
And three mounting holes 5 d for mounting the slider 5 to the slider receiver 6.

One end of the rotary shaft 4 is formed in a hollow shape as shown in FIG. 2 and has a cutout 4a on the outer periphery. A knob (not shown) is attached to one end of the rotary shaft 4.
On the other hand, a flange-shaped slider receiver 6 is integrally provided on the other end side of the rotating shaft 4, and a stopper 6 a protrudes outward from an outer peripheral surface of the slider receiver 6. As shown in FIG. 2, the end face of the slider receiver 6 is disposed at the center and protrudes in the axial direction, and has a cylindrical portion 6b having a step formed on the outer periphery, and is disposed around the cylindrical portion 6b. A projection 6c is provided.
After the cylindrical portion 6b is inserted into the through hole 3a of the insulating substrate 3, its tip is swaged, and the protrusion 6c is
After the slider 5 is inserted into the mounting hole 5d, the tip of the slider 5 is swaged.

As shown in FIG. 1 above the terminal 7,
An eyelet 7a to be inserted into the through hole 3e is provided, and an engagement piece 7b engaging with the recess 3b is provided below the terminal 7.
The printed circuit board 10 of FIG.
And a mounting portion 7c to be mounted on the power supply. Similarly, an eyelet 8a inserted into the through hole 3g is provided above the other terminal 8, and the concave portion 3d is provided below the terminal 8.
2 and an attaching portion 8c extending from the lower end of the insulating substrate 3 and attached to the printed circuit board 10 of FIG. A protruding piece 8d is provided which protrudes to engage with the stopper 6a to regulate the rotation angle of the rotary shaft 4. Furthermore, the through-hole 3f is provided above the intermediate terminal 9.
An eyelet 9a attached to the printed circuit board 10 shown in FIG. 2 is provided below the intermediate terminal 9, and an engagement piece 9b that engages with the recess 3c and an attachment piece that extends from the lower end of the insulating substrate 3 and is attached to the printed circuit board 10 of FIG. 9c.

When assembling the rotary variable resistor as shown in FIG. 2, first, the projection 6c of the slider receiver 6 is inserted into the mounting hole 5d of the slider 5, and then the tip is swaged. The child 5 is mounted on the slider receiver 6. Then, terminal 7
The terminal 7 is attached to the insulating substrate 3 by crimping the engaging piece 7b into the concave portion 3b of the insulating substrate 3 and inserting the eyelet 7a into the through hole 3e, and then caulking the tip of the eyelet 7a. The other terminal 8 and the intermediate terminal 9 are connected to the insulating substrate 3
Attach to Next, after inserting the cylindrical portion 6b of the slider receiver 6 into the through hole 3a of the insulating substrate 3, the cylindrical portion 6b
By crimping the tip of the insulating substrate 3
Attach. As a result, the cylindrical portion 6b comes into sliding contact with the inner peripheral surface of the through hole 3a of the insulating substrate 3, and the insulating substrate 3 is sandwiched between the tip and the step of the cylindrical portion 6b. Is held rotatably.

In the rotary variable resistor assembled in this manner, the mounting portion 7c of the terminal 7 is connected to the printed circuit board 10 until the base portion contacts the surface of the printed circuit board 10.
Of the other terminal 8 in the same manner.
c is inserted through another through-hole (not shown) until the base portion of the intermediate terminal 9
The insulating substrate 3 is made to stand on the printed circuit board 10 by inserting the mounting piece 9c into another through hole 12. Thereafter, the mounting portion 7 protruding to the back side of the printed circuit board 10 is formed.
c, 8c and each end of the mounting piece 9c
When the dip-soldering is performed on a land (not shown), the rotary variable resistor is mounted on the printed circuit board 10 via the terminals 7 and 8 and the intermediate terminal 9.

In use, when the rotating shaft 4 is rotated by a finger or the like, the first and second sliding pieces 5a and 5b of the slider 5 are moved in conjunction with the rotation of the rotating shaft 4 with the resistor 1 and the current collector of the insulating substrate 3. 2, respectively, and the resistance value between one of the terminals 7 and 8 and the intermediate terminal 9 is adjusted according to the sliding position between the slider 5 and the resistor 1. During the rotation operation of the rotary shaft 4, the click piece 5 c of the slider 5 is moved to the concave portion 3 c of the insulating substrate 3.
When the finger is disengaged, a sense of moderation is given to the finger via the rotation shaft 4 at the position. The rotation angle of the rotating shaft 4 is restricted within 360 degrees by the stopper 6a of the slider receiver 6 abutting on the protruding piece 8d of the one terminal 8.

In this embodiment, the connection between the resistor 1 and the terminals 7 and 8, ie, the eyelets 7a and 8a are located above the insulating substrate 3, and the eyelets 7a and 8a and the printed circuit board 1
Since the distance between the terminals 7 and 8 can be made sufficiently large, when the terminals 7 and 8 are soldered to the lands of the printed circuit board 10, heat and flux are not easily transmitted to the eyelets 7a and 8a via the terminals 7 and 8. , Resistor 1 and terminals 7, 8
The effect of heat and the effect of flux on the connection with the substrate can be prevented. Similarly, it is possible to prevent the influence of heat and the influence of the flux on the connection between the current collector 2 and the intermediate terminal 9. In addition, since the eyelets 7a to 9a are located above the insulating substrate 3 as described above, the rotating shaft 4 can be arranged in the lower direction of the insulating substrate 3, that is, in a position close to the surface of the printed circuit board 10, The height of the rotary variable resistor can be reduced, and the degree of freedom in design of the entire mechanism including the rotary variable resistor is improved.

Further, since the insulating substrate 3 can be made to stand on the printed circuit board 10 via the pair of terminals 7 and 8, it is not necessary to provide a special mounting bracket as in the prior art. Further, since the rotation angle of the rotation shaft 4 can be regulated by the protruding piece 8d of the one terminal 8, it is not necessary to separately provide a stopper for regulating the rotation angle.
Therefore, the number of parts can be reduced.

[0019]

As described above, according to the present invention,
Since the rotation axis can be arranged at a position close to the surface of the printed circuit board, it is possible to provide a rotary electric component suitable for thinning and applicable to various set designs. Also, when soldering the terminals on the printed circuit board, circuit
Since the influence of heat and the influence of flux on the connection between the pattern and the terminal can be prevented, the reliability of the mechanical connection and the electrical connection between the circuit pattern and the terminal can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotary variable resistor according to one embodiment of the present invention.

FIG. 2 is a sectional view showing an assembled state of the rotary variable resistor of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resistor 2 Current collector 3 Insulating board 4 Rotating shaft 5 Slider 6 Slider receiver 7, 8 terminal 9 Intermediate terminal 7a, 8a, 9a Eyelet (connection part) 7b, 8b, 9b Engagement piece 7c, 8c Mounting part 9c Mounting piece 10 Printed circuit board 11, 12 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01C 1/01 H01C 10/00 H01C 10/32 H05K 3/30

Claims (1)

(57) [Claims] An insulating substrate having a circuit pattern formed on a surface thereof; a pair of terminals connected to both ends of the circuit pattern ; a rotating shaft extending in a direction perpendicular to the insulating substrate; integrally provided with the a slider receiver having a circuit pattern <br/> sliding contact with the slider, said rotary electric unit both terminals are soldered on the printed circuit board
In the article , each of the terminals has an attaching portion extending from a lower end of the insulating substrate and attached to the printed circuit board, and a connecting portion between the terminal and the circuit pattern is provided on an upper portion of the insulating substrate. A rotary electric component characterized by the following.