JP3137714B2 - Variable electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip-type variable resistor whose resistance value can be adjusted or a chip-type variable capacitor whose capacitance can be adjusted. Rotatably mounted rotor member for
The present invention relates to an improvement of a variable electronic component in which a resistance value, a capacitance, and the like are adjusted by rotating a rotor member.

[0002]

2. Description of the Related Art In general, a chip-type variable resistor has a U-shaped resistance film formed in a plan view on an upper surface of a ceramic substrate, and has a bowl-like shape with an upward opening having a contact portion with the resistance film. It has a configuration in which the metal plate rotor member is rotatably mounted, and two or four portions at equal intervals along the circumferential direction in the upper portion of the rotor member,
A pair of parallel cutting lines extending in the radial direction are cut and formed, and a portion sandwiched by the cutting lines is recessed into an L-shaped cross section to form an engagement groove for the driver tool.

However, in such a configuration in which the engagement groove is formed in the rotor member made of a metal plate, if the engagement groove is formed to have a deep dimension so that the driver tool can securely engage the engagement groove of the rotor member. Since a gap is formed between the inside and outside of the rotor member at a position on the inner surface of the engagement groove, the rotor member is picked up by a vacuum suction type collet when the rotor member is mounted on the substrate, or the assembled resistor is mounted. When picking up with a vacuum suction type collet for mounting on a printed circuit board, there is a problem that a pick-up mistake is likely to occur.

On the other hand, Japanese Utility Model Laid-Open No. 61
JP-A-61808 describes that a synthetic resin rotary operation body having an engaging groove for a driver tool is integrally formed on the upper surface of a rotor member. Since the engagement groove for the driver tool can be formed in a deep dimension without generating a gap communicating with the inside and outside at the location of the engagement groove in the body, without causing a pickup error by the vacuum suction type collet,
The rotation operation of the rotor member can be reliably performed.

[0005]

However, while this prior art has the above advantages, it has a problem that it is very troublesome to integrally form the operating body on the upper surface of the rotor member. In other words, integrally forming the rotary operation body on the upper surface of the rotor member means that the rotor member is sandwiched between one mold that contacts the upper surface of the rotor member and the other mold that contacts the lower surface of the rotor member. It is performed by an injection molding method of injecting a molten synthetic resin into a cavity formed in one of the molds. In the above prior art, a rotor member is formed in a bowl shape, and a contact portion with a resistive film is formed. After forming the above, the operating body must be integrally formed, and it is troublesome to sandwich the rotor member having a complicated shape in an accurate posture with a pair of molds.

Further, a sliding portion is formed in the outer peripheral portion of the rotor member so as to be depressed downward, and the upper portion of the rotor member is cut off at the position of the sliding portion. In order to prevent the molten synthetic resin from flowing out of the cavity of the mold, the mold must have an extremely complicated shape, and it is difficult to adjust the position of the rotor member with respect to these molds. Is complicated, and it is extremely troublesome to integrally form the rotary operation body on the rotor member.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable electronic component having improved suction performance with respect to a vacuum suction collet in a form that can be manufactured extremely easily.

[0008]

In order to achieve the above object, the present invention is directed to a variable control device comprising a metal plate and a rotatable adjusting rotor member formed in a metal plate and having an upward opening. In the electronic component, on the upper surface of the rotor member,
A rotary operation body formed by integrally molding a thick synthetic resin operation part on the upper surface of a metal plate base plate, and a locking claw formed on one of the base plate and the rotor member of the rotary operation body. It is configured to bend and lock to the other side so as to be non-rotatably engaged, and that an operating groove of the rotary operating body is formed with an engaging groove for a driver tool.

[0009]

According to this structure, since the operating portion of the rotary operating body is made of synthetic resin, a gap communicating the engaging groove with the inside and outside of the rotary operating body at the position of the engaging groove is provided. Since it can be formed deeply in a state where it does not occur, the upper surface of the rotary operation body is suctioned by a vacuum suction type collet,
When assembling the electronic component or mounting the electronic component on a printed circuit board, the occurrence of a pick-up error caused by the vacuum suction collet can be significantly reduced, and the rotating operation of the rotor member by the driver tool can be reliably performed.

The rotary operating body is attached to the rotor member by bending and locking the locking claw formed on one of the base plate and the rotor member of the rotary operating body with respect to the other. Therefore, even after the rotor member is processed into a complicated shape, the rotary operation body can be quickly mounted in an accurate posture with respect to the rotor member. The department is
Since it is integrally molded with a flat base plate, it is extremely easy to integrally mold the operation part made of synthetic resin with a mold having a simple structure.
The reliable and easy attachment of the rotary operating body to these rotor members and the extremely easy formation of the operating section of the rotary operating body combine to reduce the manufacturing cost.

Therefore, according to the present invention, it is possible to inexpensively manufacture a variable electronic component capable of reliably adjusting a resistance value or the like without causing a pick-up error in an assembling process, a mounting process on a printed circuit board, and the like. Having.

[0012]

Next, an embodiment in which the present invention is applied to a chip type variable resistor will be described with reference to the drawings. 1 to 5
1 shows a first embodiment. In these figures, reference numeral 1 denotes a variable resistor provided with a ceramic substrate 2, a thin metal body rotor member 3, and a rotary operation body 4.

A through hole 5 is formed in a substantially central portion of the substrate 2 so as to open vertically. A U-shaped resistive film 6 is formed on the upper surface of the substrate 2 so as to surround the through hole 5. On the other hand, a pair of terminal electrode films 7 on both sides of the resistance film 6 are formed on one side surface of the substrate 2. A central terminal plate 8 made of a metal plate is provided on the lower surface of the substrate 2, and a support shaft 9 that fits into the through hole 5 is integrally formed on the central terminal plate 8.

The rotor member 3 is formed of a thin metal plate in the shape of a bowl with an upward opening and a ring shape in a plan view. A contact portion 3b for the resistive film 6 is formed, the rotor member 3 is fitted on the support shaft 9 and the upper end of the support shaft 9 is swaged and widened, so that the rotor member 3 is rotatably mounted on the substrate 2. Further, locking holes 1 vertically opened at three locations along the circumferential direction in the connecting portion between the flange 3a and the inclined portion 3c of the rotor member 3.
0 is cut out and formed.

The rotary operation body 4 is formed by integrally forming a thick ring-shaped operation portion 12 made of a heat-resistant synthetic resin on an upper surface of a base plate 11 formed of a metal plate in a ring shape. Locking claws 13 are formed at three positions of the base plate 11 that overlap with the locking holes 10 of the rotor member 3 in plan view.
Is cut and raised, and the locking claw 13 is bent radially outward toward the lower surface of the flange 3 a of the rotor member 3, whereby the rotary operation body 4 is non-rotatably engaged with the rotor member 3. The operating portion 12 is formed with a cruciform engagement groove 14 for a cruciform driver tool (not shown) in a plan view.

An operating portion 1 is provided on the inner peripheral edge of the base plate 11.
A plurality of protrusions 15 are formed to improve the fixability of 2, and an inclined surface 16 for guiding the insertion of a driver tool is formed on the inner peripheral edge of the operation portion 12, and further, A tongue piece 17 connected to the locking hole 10 in the rotor member 3 is bent so as to contact the lower surface of the locking claw 13.

The manufacture of the rotary operation body 4 can be performed as follows. That is, as shown in FIG. 2, the base plate 11 was connected to the pair of frame frames A2 and A2 connected by the tie bar A1 at regular intervals via the connection pieces A3 by pressing the band-shaped metal plate. The hoop material A in a state is formed, and while the hoop material A is intermittently transported along the longitudinal direction, the base plate 11 is sandwiched between a pair of upper and lower molds (not shown), and is upward. By injecting the molten synthetic resin into the cavity formed on the lower surface of the positioned mold, the operating portion 12 is integrally formed with the base plate 11, and then the base plate 11 is cut off at the connection piece A2. It can be performed in a process.

In the above configuration, the engagement groove 14 of the operation portion 12 in the rotary operation body 4 is merely a concave state,
Even if the depth of the engagement groove 14 is increased so that the driver tool is securely engaged, there is no gap formed between the inside and outside of the rotary operating body 4 at the location of the engagement groove 14, so that the vacuum suction type collet is used. By sucking the lower end surface of the rotary member 18 in contact with the upper surface of the operation section 12, the rotor member 2 to which the rotary operation body 4 is mounted is mounted on the substrate 2, or the variable resistor 1 is mounted on a printed circuit board. At the time, vacuum suction type collet 18
It is possible to significantly reduce the occurrence of a pick-up mistake due to the above.

Then, the base plate 1 of the rotary operation body 4
By bending the locking claw 13 of the rotating operation body 4
Is attached to the rotor member 3, and even when the sliding portion 3a is formed on the rotor member 3, the rotary operation body 4 can be securely attached to the rotor member 3, and
As described above, the integral molding of the operation unit 12 with the base plate 11 can be performed by sandwiching the substantially flat hoop material A between the pair of dies, and the structure of the dies needs to be complicated. Therefore, the variable resistor 1 including the operating portion 12 made of synthetic resin can be manufactured extremely easily.

A second embodiment shown in FIG.
A locking claw 13 having a radius outward is formed on the locking claw 13.
Is bent radially inward toward the lower surface of the flange 3a of the rotor member 3 so that the rotary operation body 4 is engaged with the rotor member 3. In this case, the flange 3a of the rotor member 3 is Further, by forming a locking groove 19 into which the locking claw 13 is fitted, the rotation operating body 4 cannot be rotated with respect to the rotor member 2.

In the third embodiment shown in FIGS. 7 and 8, a radially outward locking claw 13 is formed on the flange 3a of the rotor member 3, while the outer peripheral surface of the operating portion 12 of the rotary operating body 4 has a radius. An inward recess 20 is formed, and the locking claw 13 is bent radially inward toward the upper surface of the base plate 11 at the location of the recess 20. In addition, a locking groove 19 into which the locking claw 13 is fitted is formed so that the rotary operation body 4 cannot rotate with respect to the rotor member 3.

As is clear from the above embodiments, the locking claw 13 may be formed on either the base plate 11 or the rotor member 3 or on both. After the rotor member is mounted on the substrate, the rotary operation body may be engaged with the rotor member. In this case, a punch for crimping the spindle is fitted to the rotary operation body. Since it is not necessary to form a hole, the base plate and the operation unit may be formed in a non-ring shape.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a variable resistor according to a first embodiment.

FIG. 2 is a perspective view showing a procedure of manufacturing a rotary operation body.

FIG. 3 is a plan view of the variable resistor.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a view showing an assembled state of the variable resistor.

FIG. 6 is a sectional view of a main part showing a second embodiment.

FIG. 7 is a sectional view of a main part showing a third embodiment.

8 is a sectional view taken along line VIII-VIII of FIG.

[Description of Signs] 1 Variable resistor as an example of a variable electronic component 2 Substrate 3 Rotor member 4 Rotary operating body 6 Resistive film 9 Support shaft 10 Locking hole 11 Base plate 12 Operating section 13 Locking claw 14 Engaging groove A hoop material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01C 10/00-10/50 H01C 17/00 H01H 19/00-19/64

Claims (1)

(57) [Claims] 1. A variable electronic component comprising an upper surface of a substrate and a rotatable adjustment rotor member formed in a metal plate and formed in a bowl shape with an upward opening, wherein the upper surface of the rotor member is provided with a metal plate. A rotary operating body formed by integrally molding a thick synthetic resin operating portion on the upper surface of a base plate made of a metal, and a locking claw formed on one of the base plate and the rotor member of the rotary operating body on the other side. A variable electronic component, wherein the electronic component is non-rotatably engaged by being bent and locked with respect to the rotary operation body, and further, an engagement groove for a driver tool is formed in an operation portion of the rotary operation body.