JP2913076B2 - Trimmer capacitor and method of manufacturing the same - 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 a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, demand for a trimmer capacitor as an electronic component has been rapidly increasing. It is arranged and arranged on this rotor. 11 and 12 show a conventional trimmer capacitor. FIG. 11 is a plan view of the trimmer capacitor, and FIG. 12 is a sectional view of the trimmer capacitor.

In FIGS. 11 and 12, reference numeral 11 denotes phosphor bronze + S
A spring terminal made of n reflow, 11a is an annular portion of the spring terminal 11, and 11b is an extension piece of the spring terminal 11. Numeral 12 denotes a metal rotor. As shown in FIG.
a, 12b, and furthermore, the projections 12a, 12b.
b is in contact with the inner edge of the annular portion 11a of the spring terminal 11.

[0004] 13 is a disk-shaped dielectric ceramic disposed below the rotor 12, 14 is a spring terminal 11,
A cylindrical case 15 made of resin for accommodating the rotor 12 and the dielectric ceramics 13 is a terminal made of phosphor bronze + Sn reflow embedded in the bottom of the cylindrical case 14. The trimmer capacitor configured as described above is connected to the rotor 1
By rotating 2, the capacitance can be changed arbitrarily.

[0005]

By the way, the spring terminal 11 of the above-mentioned trimmer capacitor has rattle. As a result of intensive studies on this point, the spring terminal 1
The cause of the backlash is that the opening angle α of the extending piece 11b of the spring terminal 11 is set to be larger than the corresponding angle of the side wall of the cylindrical case 14 in order to facilitate the work of mounting the spring terminal 11. I realized that it was. That is, the extension piece 11 of the spring terminal 11
Since b was not pressed against the side wall of the cylindrical case 14, rattling was unavoidable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a trimmer capacitor in which the spring terminal is less likely to rattle.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin case having a groove formed in a side wall, a first electrode terminal, a rotor having a convex portion, and a repellent material. A trimmer capacitor comprising: a second electrode terminal, wherein the second electrode terminal is provided with a hook portion that hooks on the convex portion , and an extension provided in the groove. part is configured bent Rutotomoni, this extending portion be positioned outside of the groove
And the opening angle of the extending portion provided in the groove is smaller than the angle of the corresponding resin case. This is achieved by a trimmer capacitor characterized in that the extending portion is pressed against the groove of the resin case by the action.

[0008] Also, a resin case having a convex portion formed on the side wall, a first electrode terminal, a rotor having the convex portion, and a second electrode terminal made of a repellent material are provided. A trimmer capacitor, wherein the second electrode terminal is formed with a hook portion that hooks on the protrusion, and the second electrode terminal is provided with an extension disposed in a groove formed between the protrusions. And a wide portion that is wider than the groove width is formed, and the locking action between the wide portion and the end of the protruding ridge portion and the locking portion of the second electrode terminal and the convex portion of the rotor are formed. This is achieved by a trimmer capacitor wherein the second electrode terminal is hooked by a hooking action between them.

That is, if the opening angle of the extending portion bent to the second electrode terminal is configured to be smaller than the angle of the corresponding resin case, the extension portion and the hooking portion are not connected to each other. By the joint action, the second electrode terminal itself comes into pressure contact with the side wall of the resin case due to the resilience of the second electrode terminal itself. Therefore, even after the second electrode terminal is attached, it is pressed against the resin case. High quality with less rattling.
Further, if a wide portion wider than the groove width of the resin case is formed in the extending portion of the second electrode terminal, the wide portion is hooked (temporarily fixed) to the end of the ridge portion of the resin case. As a result, the mounting position is reliably determined, and rattling and falling off are unlikely to occur.

Further, an object of the present invention is to arrange a first electrode terminal in a resin case having a groove formed in a side wall, and to arrange a rotor having a convex portion in the resin case. If, latching unit for latching is configured on the projecting portion and the extending portion is disposed in the groove Ru consists bent co
In addition, a folded piece located outside the groove is formed in the extending portion.
Disposing the formed second electrode terminal made of a repellent material in the resin case; and applying a force for expanding the extending portion of the second electrode terminal; And releasing the acting force after the extended portion of the electrode terminal is pressed against the groove of the resin case.

A step of arranging the first electrode terminal on a resin case having a convex portion formed on a side wall; a step of arranging a rotor having a convex portion on the resin case; A second portion having a hook portion that is hooked on the portion, an extending portion disposed in the groove formed between the ridge portions, and a wide portion wider than the groove width. Arranging the electrode terminal in the resin case, applying a force to expand the extending portion of the second electrode terminal, and connecting the extending portion of the second electrode terminal to the resin case. Disposing in the groove between the ridges, and releasing the acting force after engaging the wide portion of the second electrode terminal with the end of the ridge of the resin case. And a method of manufacturing a trimmer capacitor.

That is, when the second electrode terminal is attached to the resin case, the engaging portion of the second electrode terminal is arranged so as to be engaged with the convex portion of the rotor. The position can be determined with certainty, and work can be performed efficiently. In addition, when the second electrode terminal is mounted on the resin case, the wide portion is hung on the end of the protruding ridge portion and is disposed, so that the mounting position can be determined more reliably.
In addition, errors in mounting work are unlikely to occur.

[0013]

1 to 10 show an embodiment of the present invention. FIG. 1 is a plan view of a trimmer capacitor, FIG. 2 is a cross-sectional view of the trimmer capacitor, and FIG. 4 and 5 are plan views and side views in a spring terminal manufacturing process, and FIGS. 6 to 8 are explanatory diagrams in a spring terminal fitting process, and FIGS. 9 and 10.
FIG. 4 is an explanatory view of a step of caulking a spring terminal.

In each of the figures, reference numeral 1 denotes a spring terminal made of, for example, phosphor bronze + Sn reflow, 1a denotes an annular portion of the spring terminal, and 1b denotes an extension of the spring terminal. As described later, the extending portion 1b has a narrow portion 1b-1 and a wide portion 1b.
-2, and the wide portion 1b-2 further includes:
A tongue piece (turned piece) 2 formed by stamping and bending a part of the wide portion 1b-2 into a U-shape is provided.

1b-3 is a shoulder located at the tip of the wide portion 1b-2. Reference numeral 3 denotes a rotor made of brass. As shown in FIG. 2, the rotor 3 has substantially semicircular convex portions 3a and 3b at the center. In addition, these convex parts 3a, 3b
Is in contact with the inner edge of the annular portion 1a. 4 is a disk-shaped dielectric ceramic disposed below the rotor 3;
Is a cylindrical case made of a liquid crystal polymer or the like and having a substantially hexagonal bottom surface (the shape from above is substantially C-shaped). Is stored.

A groove 5a is formed in the side wall of the cylindrical case 5, and a pair of protrusions 5b,
5c is configured. Further, hooks 5b-1, 5c- on which the shoulders 1b-3 are hooked are provided at the bottom ends of the protrusions 5b, 5c.
1 is provided. Reference numeral 6 denotes a terminal made of phosphor bronze + Sn reflow embedded in the bottom of the cylindrical case 5.

The above members are laminated as shown in FIG. 3 to form a trimmer capacitor. That is, the cylindrical case 5
And a predetermined amount of silicone oil 7 is dropped therein. Next, the rotor 3 is disposed in the cylindrical case 4 in a positional relationship as shown in FIG. 3, and the spring terminal 1 is further disposed at a position where the narrow portion 1b-1 corresponds to the groove 5a of the cylindrical case 5. .

Next, a detailed description will be given, with reference to FIGS. 4 and 5, of a process of manufacturing a spring terminal connecting body having the tongue piece 2. FIG. First, a thin plate made of phosphor bronze + Sn reflow is punched in a predetermined pattern, and as shown in FIG. 4, a hoop material 1f formed by connecting a large number of spring terminals 1 having an annular portion 1a and an extended portion 1b. Get.
At this time, a narrow portion 1b-1 and a wide portion 1b-2 are formed in the extending portion 1b, and a U-shaped punching is also performed on the wide portion 1b-2 at the same time. Piece 2 is formed.

Thereafter, bending processing is performed to a predetermined shape, and a hoop material 1f as shown in FIG. 5 is obtained.
The bending angle of the extending portion 1b is an obtuse angle slightly larger than a right angle. As described above, the tongue piece 2 is attached to the extending portion 1b of the spring terminal 1 in the hoop material 1f formed by connecting a large number.
When the trimmer capacitor is soldered and mounted on a substrate, the soldering area of the spring terminal 1 is increased, and the trimmer capacitor is firmly mounted on the substrate. At the same time, the presence of the wide portion 1b-2 increases the contact area between the substrate and the spring terminal 1, so that the trimmer capacitor is fixed in a more stable state.

Further, since the tongue piece 2 is formed in advance,
Extension part 1b after disposing spring terminal 1 in cylindrical case 5
The tongue piece 2 serving as a bent portion can be configured more accurately, and the operation can be greatly simplified, and the manufacturing cost can be reduced, as compared with the case where is bent. Next, a process of disposing the spring terminal 1 in the cylindrical case 5 will be described in detail with reference to FIGS.

First, the dielectric ceramics 4 and the rotor 3
The spring terminal 1 with respect to the cylindrical case 5 in which
Are arranged at an angle as shown in FIG. 6, and the inner edge of the annular portion 1a is engaged with the convex portion 3a of the rotor 3. Next, the extending portion 1 of the spring terminal 1 is pressed by pressing / pulling means (not shown).
b ends arrow direction of the force F ₁ to the, also, the corner portion of the extending portion 1b adding arrow direction of the force F _2. Thereby, the extension portion 1b
Is slightly deformed against the resilience of the spring terminal itself so that the bending angle is changed from an acute angle to an obtuse angle.
That is, in a state in which the spring pin 1 is extended to the force F ₁ direction, spring pin 1 changes to the state shown in FIG. 7 from FIG. At this time, as is apparent from FIG. 7, the narrow portion 1b-1 of the extending portion 1b moves in the groove 5a of the cylindrical case 5, and the wide portion 1b-2 moves in the cylindrical case 5b. Move while sliding on the surfaces of the convex portions 5b and 5c.

When the forces F ₁ and F ₂ are released when the spring terminal 1 is moved to the position shown in FIG. 8 where the annular portion 1a is parallel to the bottom surface of the cylindrical case 5, the cylindrical case of the spring terminal 1 is released. 5 is completely finished. As described above, the step of fitting (temporarily fixing) the spring terminal 1 to the hoop material 1f is completed with respect to the cylindrical case 5 of the hoop material formed by connecting a large number of the cylindrical cases 5, and the width of the spring terminal 1 is reduced. The portion 1b-1 presses against the wall of the groove 5a of the cylindrical case 5, and at the same time, the spring terminal 1
Of the cylindrical case 5 are hooked portions 5b-1, 5c.
A trimmer capacitor hung at -1 is obtained.

As described above, when attaching the spring terminal 1, the annular portion 1 a is hooked on the rotor 3, and a part of the spring terminal 1 is formed on the cylindrical case 5 by utilizing the elasticity of the spring terminal itself. When the spring terminal 1 is arranged so as to be pressed against the side wall and the shoulder 1b-3 of the spring terminal 1 is engaged with the engaging portions 5b-1 and 5c-1 of the cylindrical case 5, the mounting position of the spring terminal 1 is improved. Is reliably determined, the mounting accuracy is good, and the spring terminal 1 is pressed against the cylindrical case 5 by its own resilient force and locked even after the mounting, so that High quality without problems such as rattling and poor contact.

The final fixing of the spring terminal 1 and the cylindrical case 5 in the trimmer capacitor obtained as described above is performed as shown in FIGS. 9 and 10. FIG.
FIG. 5 is a view of the trimmer capacitor obtained in the step of attaching the spring terminal 1 and the cylindrical case 5 viewed from the direction of the groove 5a. In this state, the narrow portion 1b-1 of the spring terminal 1 is shown.
The tongue piece 2 is located between the convex portions 5b and 5c of the cylindrical case 5.

In this state, the upper end side wall of the cylindrical case 5 is processed by heating / pressing means (not shown), and
As shown in FIG. 2, the annular portion 1a of the spring terminal 1 is formed so as to cover the annular portion 1a, and at the same time, the convex portions 5b and 5c are processed by heating / pressing means (not shown), as shown in FIGS. The tongue piece 2 is formed so as to enclose the upper end corner. As described above, when the side wall of the cylindrical case 5 is swaged so as to enclose the upper end corner of the tongue piece 2 and the spring terminal 1 is fixed to the cylindrical case 5, the extending portion 1b of the spring terminal 1 Since the narrow portion 1b-1 which is pressed against the side wall of the groove portion and the upper end portion of the tongue piece 2 are supported and fixed, rattling of the spring terminal 1 hardly occurs.

Further, although the tongue piece 2 is formed by bending, the wide portion 1b-2 placed on the printed board has a flat shape and is not curved. Is stable, and the soldering of the trimmer capacitor to the printed circuit board is performed well. Finally, the wide portion 1b-2 of the extending portion 1b of the spring terminal 1 is cut along the line XX in FIG. 8 to obtain a product.

[0027]

[Effect] A high-quality spring terminal is unlikely to rattle.

[Brief description of the drawings]

FIG. 1 is a plan view of a trimmer capacitor according to the present invention.

FIG. 2 is a sectional view of a trimmer capacitor according to the present invention.

FIG. 3 is a schematic diagram showing a stacking order of components of a trimmer capacitor.

FIG. 4 is a plan view of the spring terminal in a manufacturing process.

FIG. 5 is a side view in a manufacturing process of the spring terminal.

FIG. 6 is an explanatory view of a step of fitting a spring terminal.

FIG. 7 is an explanatory view of a step of fitting a spring terminal.

FIG. 8 is an explanatory view of a step of fitting a spring terminal.

FIG. 9 is an explanatory view in a caulking step of a spring terminal.

FIG. 10 is an explanatory diagram of a step of caulking a spring terminal.

FIG. 11 is a front view of a conventional trimmer capacitor.

FIG. 12 is a side view of a conventional trimmer capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spring terminal 1a Annular part 1b Extension part 1b-1 Narrow part 1b-2 Wide part 1b-3 Shoulder part 2 Tongue piece 3 Rotor 4 Dielectric 5 Cylindrical case 5a Groove 5b, 5c Convex part 5b-1, 5c- 1 Hanging part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01G 5/06 H01G 5/01

Claims (4)

(57) [Claims] 1. A resin case having a groove formed in a side wall, a first electrode terminal, a rotor having a convex portion, and a second electrode terminal made of a repellent material. trimmer a capacitor, wherein the second electrode terminal is configured is engaging portion for engaging the convex portion, and extending portion is disposed in said groove is constituted bent Rutotomoni, the extending In the part
Folded piece is configured to be located outside the groove, and further, the
The opening angle of the extending portion provided in the groove is configured to be smaller than the angle of the corresponding resin case, and the extending portion is formed of the resin case by the cooperative action of the extending portion and the hook portion. A trimmer capacitor characterized by being pressed against a groove. 2. A semiconductor device comprising: a resin case having a convex portion formed on a side wall; a first electrode terminal; a rotor having a convex portion; and a second electrode terminal made of a repellent material. A trimmer capacitor, wherein the second electrode terminal is formed with a hook portion that hooks on the protrusion, and the second electrode terminal is provided with an extension disposed in a groove formed between the protrusions. And a wide portion that is wider than the groove width is formed, and the locking action between the wide portion and the end of the protruding ridge portion and the locking portion of the second electrode terminal and the convex portion of the rotor are formed. A trimmer capacitor wherein the second electrode terminal is hooked by a hooking action between them. 3. A step of arranging a first electrode terminal in a resin case having a groove formed in a side wall; a step of arranging a rotor having a convex portion in the resin case; hooking portion for hooking is formed, and extending portion is disposed in said groove is constituted bent Rutotomoni, the grooves in the extending portion
Disposing a second electrode terminal made of a repellent material having a folded piece located outside of the resin case in the resin case; and applying a force for expanding the extending portion of the second electrode terminal. A method of manufacturing a trimmer capacitor, comprising: a step of applying the force; and a step of releasing the acting force after the extending portion of the second electrode terminal is pressed against the groove of the resin case. 4. A step of arranging a first electrode terminal in a resin case having a convex portion formed on a side wall; a step of arranging a rotor having a convex portion in the resin case; A second portion having a hook portion that is hooked on the portion, an extending portion disposed in the groove formed between the ridge portions, and a wide portion wider than the groove width. Arranging the electrode terminal in the resin case, applying a force to expand the extending portion of the second electrode terminal, and connecting the extending portion of the second electrode terminal to the resin case. Disposing in the groove between the ridges, and releasing the acting force after engaging the wide portion of the second electrode terminal with the end of the ridge of the resin case. Method of manufacturing a trimmer capacitor.