JP2602758Y2 - Trimmer capacitor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimmer capacitor, and more particularly to a trimmer capacitor that can be made thin.

[0002]

2. Description of the Related Art Hitherto, a trimmer capacitor on an electronic circuit board has been frequently used for adjusting characteristics of a circuit.
FIG. 4 shows a conventional trimmer capacitor.

In the trimmer capacitor, a dielectric rotor 45 having a rotor electrode 46 formed thereon is mounted on a stator substrate 41 having a stator electrode 42 on the surface, and an adjustment pin 49 is arranged on the rotor 45. Was.

[0004] The stator substrate 41 is integrally formed with a horseshoe-shaped stator electrode 42 and a stator terminal 44 connected to the stator electrode 42 when the substrate 41 is molded. The through-hole 43 through which the pin part penetrated was formed.

The rotor 45 is made of a dielectric ceramic, has a semicircular rotor electrode 46 formed therein, and further has a through hole 47 through which a pin portion of an adjustment pin penetrates similarly to the stator substrate 41. A part of the rotor electrode 46 is exposed on the inner wall of the through hole 47 of the rotor 45, and a conductive film 53 is further formed.

The adjustment pin 49 is made of metal or the like, and has a disk-shaped head 50 having an adjustment groove 52 formed thereon, and a pin portion 51 extending from the bottom surface of the head 50.

In these assemblies, the stator substrate 4
The rotor 45 is placed on the top 1, and the pin portions 51 of the adjustment pins 49 pass through the through holes 43 and 47 of the stator substrate 41 and the rotor 45. At this time, the rotor 45 and the adjustment pin 49
Are rotated integrally, and the adjustment pin 49 and the rotor electrode 4
The conductive adhesive 53 is applied to at least the inner wall of the through hole 47 of the rotor 45 in order to make an electrical connection with the rotor 6. The pin portion 51 of the adjustment pin 49 is fixed on the back surface of the stator substrate 71 via the spring member 54 and the rotor terminal 44.

By rotating the adjustment pin 49 by a predetermined amount, the rotor 45 is simultaneously rotated and the stator electrode 42 is rotated.
The facing area between the rotor terminal 46 and the rotor terminal 46 changes, and the stator terminal 44 and the rotor terminal 48 (the rotor electrode 46 and the pin 5
1, the rotor terminal 48 is electrically connected) to derive a predetermined capacity.

[0009]

However, in the above-described trimmer capacitor, the rotor 45 and the adjustment pin 49 are mounted on the stator substrate 41, and the spring member 54 and the rotor terminal 44 are mounted on the back surface of the stator substrate 41. There is a problem that the entire part becomes thicker because the part is crimped. Specifically, in the conventional trimmer capacitor, the thickness from the crimping portion of the stator substrate to the upper portion of the adjustment pin is about 2 mm. In addition, the number of components is large, which has been a major obstacle to reducing the manufacturing cost.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a trimmer capacitor which can reduce the number of parts and can be made thin.

[0011]

The present invention has been implemented to achieve the above-mentioned object by a dielectric means having a stator electrode formed therein and a through hole formed in a direction of the thickness of the substrate. On the body stator substrate, an adjustment groove is formed on the upper surface, a rotor member is provided on the lower surface, and a rotor member having a caulking hole in which a part of the rotor electrode extends is disposed at the center, and a rear surface side of the stator substrate is disposed. A crimping pin inserted through the through hole is held by crimping in the crimping hole of the rotor member.

[0012]

As described above, since the adjustment groove is formed on the stator substrate and only the rotor member on which the rotor electrode is formed is mounted, the entire component can be made thinner.

Further, since the caulking is performed between the back surface of the stator substrate and a part of the rotor electrode extending into the through hole, a part of the rotor electrode can be used also as a spring member. In addition, it is not necessary to use a conductive adhesive that has conventionally electrically connected the adjustment pin and the rotor, so that the number of parts can be greatly reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The trimmer capacitor according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional structural view of the trimmer capacitor of the present invention.

A trimmer capacitor includes a stator substrate 1 having a stator electrode 2 formed therein, and an adjusting groove 4 on an upper surface.
Is formed, and a rotor member 3 having a rotor electrode 5 formed on a lower surface in contact with the stator substrate 1;
And a caulking pin 6 for integrally holding the rotor member 3.

The stator substrate 1 is made of dielectric porcelain having a through hole 7 formed at the center, and a stator electrode 2 is formed inside the stator substrate 1 on one side from the through hole 7. The stator electrode 2 extends to one end of the stator substrate 1 as it is. On one end surface of the stator substrate 1, a stator terminal 8 electrically connected to the stator electrode 2 is formed. A rotor terminal 9 is formed on the other end face facing the stator terminal 8. The rotor terminal 9 extends to the periphery of the through hole 7 on the back surface of the stator substrate 1. A specific method for manufacturing the stator substrate 1 is to print a stator electrode 2 on a porcelain substrate serving as a base with Ag, Ag-Pd, or the like, and further laminate a dielectric sheet (0.02 mm thick) having a predetermined dielectric constant. After pressing, firing. Thereafter, printing and baking are performed to form terminals 8 and 9 on the end face of the substrate. The surfaces of the terminals 8 and 9 are plated with Ni or solder as required.

The rotor member 3 is made of engineering plastic or the like, and has a caulking hole 10 formed at the center.
Further, a semicircular rotor electrode 5 is formed on the lower surface of the rotor member 3, that is, a surface that comes into contact with the stator substrate 1, and a negative or positive adjustment groove 4 is formed on the upper surface of the rotor member 3. Are formed. 2 and 3
As shown in the figure, a lead member 11 is formed in the caulking hole 10 of the rotor member 3 so as to extend from the rotor electrode 5 and close the caulking hole 10. A caulking portion 12 through which the caulking pin 6 penetrates is formed at the center of the lead member 11, and the periphery of the lead member 11 is embedded in the rotor member 3. For example, the thickness of the rotor member is about 0.3 mm,
The rotor electrode 3 and the lead member are made of a metal body having a spring property such as nickel-white or phosphor bronze. A specific method of manufacturing the rotor member is manufactured by molding the resin with the rotor electrode 5 and the lead member 11, and the adjusting groove 4 and the caulking hole 10 are formed by the shape of the mold.

The connection between the stator substrate 1 and the rotor member 3 having the above-described structure is performed by a caulking pin 6 made of a metal such as nickel-white, phosphor bronze, or stainless steel. The caulking pin 6 includes a flat head 13 and a pin portion 14 extending from the head 13 and capable of being caulked at the tip. This pin part 14
Is inserted from the back side of the stator substrate 1 into the through-hole 7 and the caulking portion 12 of the rotary member 11 extending to the caulking hole 10 of the rotor member 3, and is further caulked on the upper surface side of the rotary member 11. I do. For the crimping process in the crimping hole 10, the diameter of the crimping hole 10 needs to be about 0.3 to 0.4 mm, and may be further increased in consideration of the shape of the component.

Thus, the caulking pin 6 and the lead member 1
1 is brought into a pressure contact state, and by contact with a part of the rotor terminal 9 extending from the end face by the head 13,
The rotor electrode 5 and the rotor terminal 9 are electrically connected.

In the trimmer capacitor having the above-described structure, a driver or the like is fitted into the adjustment groove 4 of the rotor member 3 and is rotated by a predetermined amount, so that the rotor member 3 rotates by a predetermined amount on the stator substrate 1. Become. As a result, a capacity corresponding to the facing area between the rotor electrode 5 and the stator electrode 2 formed inside the dielectric stator substrate 1 is derived from between the stator terminal 8 and the rotor terminal 9.

As described above, the trimmer capacitor according to the present invention has a structure in which the rotor member 3 is mounted on the stator substrate 1 and is held by the caulking pins 6. The thickness of the entire component can be reduced as compared with a trimmer capacitor on which is mounted.

Further, in the trimmer capacitor of the present invention,
Since the caulking portion of the caulking pin is performed by the rotary member 11, it can be stably held by the resiliency of the lead member 11, and the rotor member 3 can rotate stably. In the conventional trimmer capacitor, a separate spring member is interposed in the caulked portion, but this spring member can be reduced. Similarly, the amount of adhesive used to bond the rotor and the adjustment pin can be reduced.

Further, according to the present invention, the contact surface between the rotor member 3 and the stator substrate 1 where the two members come into contact with each other can be easily polished, so that a stable capacity can be obtained.

The caulking pin 6 is provided on the back surface of the stator substrate.
If the concave portion in which the head 13 is buried is formed, the thickness can be further reduced, the back surface of the stator substrate 1 becomes flat, and the surface mounting can be performed on the printed circuit board like other chip components. .

[0025]

[0026]

As described above, according to the present invention, the rotor member is mounted on the stator substrate and is caulked by the rotary member fixed to the through hole of the rotor member. In addition, the thickness of the parts is substantially the stator substrate and the rotor member, and a thinned trimmer capacitor is achieved. In addition, the number of parts can be reduced and an inexpensive trimmer capacitor can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional structural view of the trimmer capacitor of the present invention.

FIG. 2 is a plan view of a lower surface side of a rotor member used in the trimmer capacitor of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of a conventional trimmer capacitor.

[Explanation of symbols]

 1 ... stator substrate 2 ... stator electrode 3 ... rotor member 4 ... adjustment groove 5 ... rotor electrode 6 ... crimping pin 7 ····· Through hole 8 ···· Stator terminal 9 ····· Rotor terminal 10 ··· Crimping hole 11 ··· Lead member 12 ··· Crimping portion

Claims (1)

(57) [Scope of request for utility model registration] A stator electrode is formed inside a substrate,
An adjustment groove is formed on the upper surface, and a rotor electrode is provided on the lower surface, on a dielectric stator substrate having a through hole formed in a direction.
In particular, a rotor member having a caulking hole in which a part of the rotor electrode extends is disposed at the center, and a caulking inserted through the through hole from the back side of the stator substrate.
A trimmer capacitor wherein a clamping pin is crimped and held in a crimping hole of a rotor member .