JPH0514484Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rotationally operated electric component that can change the resistance value or change the switch by rotating the slider receiver.

[Conventional technology]

A rotary-operable variable resistor is taken up as a conventional example of this type of rotary-operable electric component, and FIGS.
This will be explained using figures.

FIG. 5 is a longitudinal cross-sectional view of a variable resistor, and FIG. 6 is a plan view of an insulating substrate provided in the variable resistor. In these figures, 1 is a slider receiver, 2 is a slider piece, 3 is an insulating substrate, 4 is a holding plate, and 5 is a frame.

The slider receiver 1 is made of synthetic resin, and has a knob 1a on its upper surface, a support shaft 1b in the center on its lower surface, an annular regulating wall 1c on its periphery, and a stopper on a part of its periphery. protrusions 1d are formed respectively. The regulating wall 1c defines a predetermined clearance (space) between the lower surface of the slider receiver 1 and the upper surface of an insulating substrate 3, which will be described later. The slider piece 2 is fixed so as to be positioned.

The insulating substrate 3 is made of an insulating material such as phenol resin or glass epoxy resin, and has a hole 3a in the center thereof into which the support shaft 1b is inserted.
As is clear from FIG. 6, on the surface of the insulating substrate 3, a current collector 6 and a resistor 7 made of carbon ink or the like are printed in an annular shape from the inside centering on the hole 3a. Furthermore, these current collectors 6
Leads 6a and 7a made of silver ink or the like extend from a part of the resistor 7 toward one side edge of the insulating substrate 3, and leads 6a and 7a made of a metal plate are respectively extended from a part of the resistor 7 toward one side edge of the insulating substrate 3. The terminal 8 is eyeleted and electrically connected to each lead 6a, 7a. In FIG. 6, a broken line indicates an overcoat layer 9 made of an insulating material, and the overcoat layer 9 is formed on the insulating substrate 3 to cover the leads 6a and 7a.

The holding plate 4 is a bent metal plate.
It is attached to the lower surface of the insulating substrate 3 by a frame 5, which will be described later. A short abutting piece 4a is formed on one opposing side of the holding plate 4, and a long independent leg 4b is formed on the other opposing side by bending downward.

The frame body 5 is formed by forming a metal plate, and has a shaft portion 5 on the upper surface that supports the knob 1a.
a is formed, and the protrusion 1d is formed on a part of the peripheral surface.
A bent part 5b for a stopper is formed which can be engaged with the stopper. Although not shown, a plurality of mounting feet are provided vertically at the bottom of the frame 5, and by bending these mounting feet along the lower surface of the holding plate 4,
The frame body 5, the insulating substrate 3, and the holding plate 4 are stacked one on top of the other in order from above and are integrated, and a part of the slider receiver 1 is rotatably housed and held within the frame body 5.

The variable resistor configured in this manner is soldered and mounted on the printed circuit board 10 shown by the two-dot chain line in FIG. That is, both abutting pieces 4 of the holding plate 4
a against the top surface of the printed circuit board 10, and fit both free-standing legs 4b into mounting holes (not shown) of the printed circuit board 10, and attach the variable resistor to the printed circuit board 10.
0, each terminal 8 is attached to the printed circuit board 1.
It is soldered to the solder land (not shown) on the lower surface of the 0.

In the variable resistor mounted on the printed circuit board 10 as described above, when the knob 1a is pinched and rotated with fingers, the slider piece 2 moves onto the current collector 6 and the resistor 7. Rotate and slide each,
A change in resistance value corresponding to the sliding contact position between the slider piece 2, the current collector 6, and the resistor 7 is extracted from each terminal 8. In this case, the regular wall 1c formed on the periphery of the slider receiver 1 rotates and slides on the outside of the resistor 7 on the insulating substrate 3 and crosses each lead 6a, 7a. Since the leads 6a and 7a are covered with an overcoat layer 9 having high mechanical strength, peeling of the leads 6a and 7a is prevented. Note that the rotation angle of the knob 1a is the same as that of the slider receiver 1.
When the protrusion 1d contacts the bent portion 5b of the frame 5, it is regulated within a predetermined range.

[Problem that the invention attempts to solve]

By the way, in the conventional example configured as described above, the annular regulating wall 1c vertically provided on the lower surface periphery of the slider receiver 1 is located outside the resistor 7 on the insulating substrate 3 and on the overcoat layer 9. By sliding on the current collector 6 and the resistor 7, each slider piece 2 rotates and slides on the current collector 6 and the resistor 7 while maintaining a constant contact pressure. For this reason, not only is the complicated process of printing the overcoat layer 9 required, but when the distance between the resistor 7 and the terminal 8 is narrowed in order to achieve miniaturization, the regulating wall 1c collides with the terminal 8. However, there was a problem in that the rotational operation of the slider receiver 1 was impaired.

Therefore, the purpose of the present invention is to solve the problems of the prior art described above, to provide a rotary operation type electrical component that eliminates the need for an overcoat layer on the lead portion that provides continuity between the conductive pattern and the terminal, and that can be miniaturized. Our goal is to provide the following.

[Means for solving problems]

In order to achieve the above object, the present invention includes an insulating substrate on which a ring-shaped conductive pattern and a lead pattern derived from the conductive pattern are formed, and a slider receiver having a slider piece fixed to the lower surface. , a rotationally operated electrical component configured to obtain a predetermined electrical signal by rotating the slider holder to change the sliding contact position between the slider piece and the conductive pattern,
A first wall portion extending concentrically with respect to the rotation center of the slider receiver outward from a portion of the slider receiver to which the slider piece is fixed; A second wall that is biased in the direction of the rotation center and has a short height dimension is continuously formed so as to have an annular shape as a whole, and the bottom surface of the first wall extends outside the conductive pattern of the insulating substrate. It is characterized by being configured to slide.

[Effect]

According to the above means, the first wall portion slides on the insulating substrate outside the conductive pattern, and the second wall portion rotates with a minute gap between the conductive pattern and the lead pattern. A coating layer becomes unnecessary. In addition, the first wall is an arc that is close to a perfect circle, and the second wall is an arc that is offset toward the center of rotation from the first wall, so that the terminal can be moved as far as possible toward the center of rotation. It is possible to bring the electrical components closer together, and it is possible to downsize the electrical components.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figures 1 to 4 relate to an embodiment of the present invention, in which Figure 1 is a longitudinal sectional view of a variable resistor, Figure 2 is an exploded perspective view thereof, and Figures 3a and 3b are views of a slider receiver. A bottom view and a side view, and FIGS. 4a and 4b are a plan view and a side view of the insulating substrate, in which 11 is a slider receiver, 12 is a slider piece, 13 is an insulating substrate, and 14 is a holding plate. .

The slider receiver 11 made of synthetic resin is formed into a disk shape with a portion cut out, and an uneven portion 11a is formed on the circumferential surface excluding the cutout portion. A support shaft 15 having a tapered snap protrusion 15a is vertically disposed at the center position of the lower surface of the slider receiver 11, and the support shaft 15 has three slots 15 extending in the axial direction.
b is formed. In addition, on the lower surface of the slider receiver 11, a first regulating wall 16 having a generally annular shape as a whole and a second regulating wall 17 having a semicircular arc shape are formed with a predetermined interval maintained around the support shaft 15. has been done.

As is clear from FIGS. 3a and 3b, the first regulating wall 16 is not a perfect circle, but has a first wall portion 16a extending in a semicircular arc shape with a constant radius around the support shaft 15, A second wall portion 16b extends from both ends of the first wall portion 16a with a gradually decreasing radius, and the height dimension of the second wall portion 16b is equal to the height dimension of the first wall portion 16a. It is set smaller by Δl compared to . On the other hand, the second regulating wall 17
A protruding piece 17a is integrally formed at the center position of the lower end, and the protruding piece 17a extends in the direction of the support shaft 15.

Furthermore, a first
A pin 18 is vertically provided inside the regulating wall 16, and the slider piece 12 is fixed to the lower surface of the slider receiver 11 by caulking the pin 18. A plurality of contact portions 12a are formed on this slider piece 12 so as to straddle the support shaft 15, and these contact portions are configured to come into sliding contact with a circumferential conductor and a resistor formed on an insulating substrate, which will be described later. It's summery.

The insulating substrate 13 is made of an insulating material such as phenolic resin or glass epoxy resin, and has a locking hole 19 into which the support shaft 15 of the slider receiver 11 is inserted. As shown in FIG. 4a, the surface of the insulating substrate 13 has the locking holes 1
An annular current collector 20 surrounding the 9 and the locking hole 19
First and second resistors 21 and 22 are respectively printed and formed to extend annularly within a predetermined angular range with the resistors 21 and 22 at one end.
They are connected via a lead portion 20a led out from a part of the . Further, on one side edge of the insulating substrate 13,
The current collector 20 and the first and second resistors 21 and 2
2, three terminals 23 are eyeleted, and these terminals 23, the current collector 20, and the first and second resistors 21, 22 have lead portions 20b, 21a, 22a, respectively. connected via. Further, ear pieces 13a are bored on opposite side edges of the insulating substrate 13, and these ear pieces 13a
The vicinity of a is a stopper surface 13b for regulating the rotation angle of the slider receiver 11.

The holding plate 14 is made of a thin metal plate, and one opposing side thereof has a downwardly extending self-supporting leg 14a bent and formed, and the other opposing side has an upwardly extending mounting piece 14b bent and formed, and the center An escape hole 24 is bored at the position. Fourth
As shown in FIG.
is integrally attached to the lower surface of the insulating substrate 13 by bending it inward along the upper surface of the ear piece 13a.

Next, the assembly process of the above embodiment will be explained. First, the current collector 20 and the first and second resistors 2
1, 22, their lead parts 20a, 20b, 2
1a and 22a are printed on the insulating substrate 13, and then the mounting pieces 14b of the holding plate 14 are bent and locked to the ears 13a of the insulating substrate 13, as shown in FIG. 4a. , b, the holding plate 14 is attached to the lower surface of the insulating substrate 13 in advance. On the other hand, by inserting the mounting hole of the slider piece 12 into the pin 18 of the slider receiver 11 and then caulking the pin 18, as shown in FIGS. The slider piece 12 is attached to. Next, the projecting piece 17a of the slider receiver 11 is locked to the lower surface periphery of the insulating substrate 13, and using this locking portion as a fulcrum, the support shaft 15 of the slider receiver 11 is inserted into the locking hole 19 of the insulating substrate 13. Insert into. In this case, the spindle 1
5 is easily deformed in the radial direction by each slot 15b, so each snap protrusion 1 of the support shaft 15
5a can be easily secured to the lower surface of the insulating substrate 13, thereby obtaining the variable resistor shown in FIG.

After the variable resistor thus configured is assembled as described above, it is soldered to the printed circuit board 25 shown by the two-dot chain line in FIG. in this case,
With the variable resistor temporarily fixed on the printed circuit board 25 using the independent legs 14a of the holding plate 14,
Each terminal 23 is soldered to a solder land (not shown) on the lower surface of the printed circuit board 25.

As is clear from the above description, the variable resistor according to this embodiment can be assembled with one touch, so that the soldering work can be performed on the semi-finished product before the slider receiver 11 is assembled on the insulating substrate 13.
After soldering to the printed circuit board 25, the support shaft 15 of the slider receiver 11 can be snapped into the locking hole 19 of the insulating substrate 13 after the soldering process has been completed, as described above, to assemble the variable resistor mounted on the printed circuit board 25. In this case, since the terminals 23 are soldered to the printed circuit board 25 in a semi-finished state before the slider receiver 11 is assembled, there is no risk of flux adhering to the slider receiver 11 during the soldering process, and the flux does not rise up the free-standing legs 14a of the holding plate 14 to reach the insulating substrate 13.
This also reduces the risk of flux reaching the surface, making it possible to prevent poor contact caused by the adhesion of flux.

In the case of the variable resistor mounted on the printed circuit board 25 as described above, when the uneven portion 11a of the slider receiver 11 is pinched with fingers or the like and rotated, the slider pieces 12 are gathered together in conjunction with this. electric body 20 and first and second
are rotated and slid on the resistors 21 and 22, respectively, and changes in resistance values corresponding to these sliding contact positions are transmitted to each terminal 23 via each lead portion 20b, 21a, 22a.
taken out from In this case, the slider receiver 11 is
The projecting piece 17a of the second regulating wall 17 slides on the lower surface periphery of the insulating substrate 13, and the first wall portion 16a of the first regulating wall 16 slides on the upper surface of the insulating substrate 13, thereby improving the insulation. The rotation angle of the second regulating wall 17 is regulated by being rotated with respect to the substrate 13 without causing play, and both ends of the second regulating wall 17 in the circumferential direction abut against the stopper surface 13b of the insulating substrate 13.
Further, the first regulating wall 16 that rotates in conjunction with the slider receiver 11 is formed into a stepped shape in which the height of the second wall portion 16b is shorter than that of the first wall portion 16a, as described above. Therefore, the first wall portion 16a moves along the insulating substrate 13 along the locus A shown by the two-dot chain line in FIG. 4a.
The second wall portion 16b slides on the insulating substrate 1.
3, each lead portion 20b, 21a, 22a rotates while maintaining a minute gap Δl with the surface of the first regulating wall 16.
There is no risk of wire breakage due to Moreover, this second
Since the wall portion 16b is formed to have a smaller diameter than the first wall portion 16a, each terminal 23 is connected to the first wall portion 16a.
The variable resistor can be brought closer to the locking hole 19 without colliding with the variable resistor a, and in other words, the variable resistor can be made as small as possible.

Furthermore, since the current collector 20 and the first and second resistors 21 and 22 on the insulating substrate 13 are generally surrounded by the first regulating wall 16, although there is a small gap Δl, dust and other Intrusion of foreign matter is prevented by the first regulating wall 16, and a highly dust-proof variable resistor is realized.

Although the above embodiment has been described using a variable resistor as an example of a rotary-operable electrical component, it goes without saying that the present invention can be applied to other rotary-operable electrical components such as a rotary switch.

[Effect of idea]

As explained above, according to the present invention, the first wall of the regulating wall rotates and slides on the insulating substrate outside the conductive pattern, has a shorter height than the first wall, and has a center of rotation. Since the second wall part biased in the direction rotates on the lead pattern with a small gap, there is no need for an overcoat layer covering the lead pattern, and the rotary operation type can be miniaturized. We can provide electrical parts.

[Brief explanation of drawings]

Figures 1 to 4 illustrate a variable resistor according to an embodiment of the present invention, in which Figure 1 is a longitudinal sectional view of the variable resistor, Figure 2 is an exploded perspective view thereof, and Figure 3 a. Figure 3 is a bottom view of the slider holder with the slider piece attached.
Figure b is a side view of the same, Figure 4a is a plan view of the insulating substrate with the holding plate attached, Figure 4b is a side view of the same, Figure 5
The figure is a longitudinal sectional view of a conventional variable resistor, and FIG. 6 is a plan view of an insulating substrate provided in the variable resistor. 11... Slider holder, 11a... Uneven part, 12...
... Slider piece, 13 ... Insulating board, 13a ... Ledge piece, 13b ... Stopper surface, 14 ... Holding plate, 1
4a... Self-supporting leg, 14b... Mounting piece, 15... Support shaft, 15a... Snap projection, 15b... Slit, 16... First regulating wall, 16a... First wall portion, 16b... ...Second wall portion, 17...Second regulation wall, 17a...Protrusion piece, 19...Locking hole, 20...
Current collector, 21...first resistor, 22...second resistor, 20a, 20b, 21a, 22a...lead part, 23...terminal, 25...printed board.

Claims (1)

[Scope of utility model registration request] an insulating substrate on which a ring-shaped conductive pattern and a lead pattern derived from the conductive pattern are formed;
Equipped with a slider holder with a slider piece fixed to the bottom surface,
In the rotary operation type electric component, a predetermined electrical signal is obtained by rotating the slider receiver to change the sliding contact position between the slider piece and the conductive pattern, A first wall portion extending concentrically with respect to the rotation center of the slider holder outwardly of the portion to which the slider piece is fixed, and a first wall portion that is offset from the first wall portion in the direction of the rotation center. and a second wall portion having a short height dimension are continuously formed so as to have an annular shape as a whole, and the bottom surface of the first wall portion slides on the outside of the conductive pattern of the insulating substrate. A rotary operation type electrical component characterized by: