JPH01312819A - Manufacture of feedthrough-type capacitor - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy and reduce cost by forming recessed and protruded parts for preventing fluctuation of fixing position between a insulator and an external contact on their contacting surface corresponding to them. CONSTITUTION:In a feedthrough-type capacitor provided with a through conductor 14, recessed and protruded parts, namely a protruded part 13a and a recessed part 15, are formed on a contact surface of an insulator 13 and an external contact 12 for preventing fluctuation of fixing position between them. Thus, when inserting or removing a plug, a molded parts does not come out of the external contact 12 and does not affect the fixing position within the external contact. Therefore, it is possible to omit a metal ring which has been a requisite and is not necessary no form a ring-shaped protruded part which is in contact with a metal ring on the inner-periphery surface of the external contact. It improves dimensional accuracy and reduces cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention mainly relates to a cross-shaped capacitor suitable for use in an antenna input circuit unit of a TV receiver, and a method for manufacturing the same.

(Prior Art) One of the conventional reception disturbances in TV receivers is ghost or anti-tJAl& video disturbance due to reflection of signal radio waves. To prevent this image disturbance, a bypass capacitor is generally installed in the coaxial cable led from the antenna to pass unnecessary frequency signals, but a feed-through capacitor as shown in Figure 5 is used as this bypass capacitor. .

The through-hole type capacitor shown in the figure has a through hole 2 formed inside an external metal fitting 1 formed into a stepped cylindrical shape having a small cylindrical portion 1b and a large cylindrical portion 1a. An annular ceramic capacitor 5 having electrodes 3 and 4 is built in with the electrode 3 fixed to a washer-like metal fitting 6 fixed on the internal stepped surface of the external metal fitting 1.

Further, the electrode 4 of the ceramic capacitor 5 has a cylindrical external contact 7 provided with a ring-shaped protrusion 7a over the entire circumference of the central portion of the inner peripheral surface, and a metal ring 11 fitted to the negative end. A through conductor 10 is fixed, which is partially covered with an insulator 8 and has an inner contact 9 coaxially arranged in the center of the outer contact 7. still,
The ring-shaped protrusion 7a is for preventing the position of the insulator 8 into which the metal ring 11 is fitted from changing.

Incidentally, among the components of the through conductor 10, the internal contact 9 and the insulator 8 are molded in advance as shown in FIG. 6 before being attached to the external contact 7.

11 in the figure is a first mold, and this first mold 11 has a through hole 11 into which one end 9a of the internal contact 9 can be inserted.
a is formed. The open end 11b of the through hole 11a on the side of the contact surface 11b with the second mold 12, which will be described later, has a shape corresponding to the shape of a part of the insulator 8 to be molded.

On the other hand, 12 in the figure is a second mold, and this second mold 1
2 is formed with a through hole 12a into which the other end 9b of the internal contact 9 can be inserted and held. An insulator filling part 12b formed in the shape in which the insulator 8 is to be molded is formed at the open end of the through hole 12a on the side of the contact surface 12d with the first mold 11 of the through hole 12a. has been done.

Insulator 8 formed by such first and second molds 11 and 12
The molding is as follows.

■First, the other end 9a of the internal contact 9 is inserted into the through hole 11a of the first mold 11 and the n through hole 12a of the second mold 12,
9b are fixed respectively. Note that in this state, the first mold 11 is separated from the second mold 12.

■Next, move the first mold 11 in the six directions of the arrows and the second mold 12.
is moved in the direction of arrow B to avoid contact between the second mold 12 and the first mold 11, and at this time, the insulator resin is poured from the gate 13 into the space formed by the open end 11b and the insulator filling part 12b. Inject while heating and melting.

(2) After the injected insulating resin has solidified, the first mold 11 is moved again in the direction of arrow B and the second mold 12 is moved in the direction of arrow 6, and the molded product is taken out.

■The molded product thus taken out is as shown in FIG. 7(a). Among these, the molded insulator 8 has one end portion 8
A is made to be the small diameter end, and the metal ring 11 shown in FIG. 2B is fitted therein.

The reason for fitting the metal ring 11 in this way is to avoid scratches and chips that occur on the insulator 8 when a molded product is press-fitted into the external contact 7, and the occurrence of racks due to the pressing force with the external contact 7 after press-fitting. This is because it is necessary to prevent
It is necessary to prevent the molded product from being handled beyond the ring-shaped protrusion 7a of the external contact 7, and to prevent the fixed position within the external contact 7 from changing due to the ring-shaped protrusion 7a. This is because there is.

(2) The metal ring 11 fitted to the molded product as described above is press-fitted into the external contact 7 as shown in FIG. In this way, the threaded conductor 10 shown in FIG. 5 is completed.

(Problem to be Solved by the Invention) However, since the above-described through conductor 10 is press-fitted into the external contact 7 after molding the insulator 8 on a part of the internal contact 9, the internal contact 9 is placed in the center of the external contact 7. There was a problem with dimensional accuracy that the numbers did not match. In general, since the manufacturing process proceeds chronologically, not only is it not possible to shorten the time required for manufacturing, but there is also a demand for cost reduction by reducing the number of parts, etc., but it is not possible to meet this demand. There was also the problem.

SUMMARY OF THE INVENTION Accordingly, the present invention aims to provide a page-through type capacitor and a method for manufacturing the same, which improve dimensional accuracy and reduce costs.

[Structure of the invention] (Means for solving the problem) The structure of the present invention for achieving the above object is based on the above-mentioned d
In a through capacitor, a contact surface between an insulator and an external contact is formed with corresponding uneven portions to prevent fluctuations in the fixing position between the two.

In addition, as a method for manufacturing the above-mentioned feedthrough capacitor, an internal contact is held in a cylindrical external contact having an uneven portion on a part of the inner peripheral surface in a non-contact state with the external contact, and the external contact The method includes a step of filling an insulator into a portion where the uneven portions are formed.

(Function) The function of the present invention having the above-mentioned configuration is that the contact surface between the insulator and the external contact is formed with corresponding uneven parts, so that the load of the plug inserted into and removed from the through-type capacitor υ is reduced. This makes it possible to prevent defects such as fluctuations in the fixing positions of the internal contacts and the insulator within the external contacts, and the occurrence of defects such as handling.

Furthermore, an internal contact is held in a non-contact state with the external contact within a cylindrical external contact having an uneven portion formed on a part of the inner circumferential surface, and an insulator is applied to a portion of the external contact where the uneven portion is formed. This method simplifies the manufacturing process, eliminates the need for metal rings that were previously required, and improves dimensional accuracy because the external contacts, internal contacts, and insulators are positioned and manufactured at the same time. You can also try to improve it.

(Example) Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a partial cross-sectional view of a through conductor as an example used in an N oil paint capacitor, and FIG.

(b) shows an exploded view of the through conductor shown in Figure 1.
FIG. 2(a) is a perspective view showing a state in which an insulator is molded and fixed on a part of the internal contact, and FIG. 2(b) is a partial sectional view of the external contact.

The through conductor 14 shown in FIG. 1 has almost the same structure as the conventional through conductor shown in FIG. be. In the figure, 12 is a cylindrical external contact, 13 is an insulator, and 9 is the internal contact.

As shown in FIG. 2(a), the insulator 13 has a substantially cylindrical shape with the internal contact 9 at its center, and has a convex portion 13a located approximately in the center of its circumferential surface 13b and extending over its entire circumference.
It is equipped with the following.

On the other hand, the external contact 12 has a cylindrical shape as shown in FIG.
3 is formed.

The NOF capacitor equipped with the through conductor 14 configured as described above has an uneven portion on the contact surface between the insulator 13 and the external contact 12 to prevent fluctuation of the fixing position between the two parts, that is, a protrusion 13a and a recess. 15 are formed in correspondence with each other.

Therefore, when a plug (not shown) is inserted or removed, the center of the molded product does not come out from the external contact 12, and the fixed position within the external contact 12 does not change. Therefore, it is possible to omit a metal ring, which has conventionally been essential, and furthermore, there is no need to form a ring-shaped protrusion on the inner peripheral surface of the external contact to come into contact with the metal ring.

Next, a method for manufacturing the through conductor 14 configured as described above will be explained with reference to FIG. 3.

First, in this embodiment, the first mold 16 and the internal contact 9 are fixed. A second mold 17 that holds the external contact 12 and is movable in the direction of arrow C or D is used.

A through hole 16b into which one end 9a of the internal contact 9 can be inserted is formed in the first mold 16. In addition, the open end of the d through hole 16a on the side of the contact surface 16C with a second mold 17, which will be described later, is made to correspond to the shape of a part of the insulator 13 to be molded, and roughly formed into the shape of the external contact 12. A cylindrical protrusion 16d is formed so as to be in close contact with the inner circumferential surface of the collar formed on the one end 12d.

The second mold 17 is formed with a cylindrical through hole 17a in which the external contact 12 can be fixed via the outer periphery of the flange of the external contact 12, and the center of the through hole 17a is connected to the first mold. The center of the through hole 16b in the mold 16 is made to coincide with the center. Further, the inner contact 17 is fixed to the second mold 17 and has a through hole 17d that comes into close contact with the other end 9b of the contact 9, and a convex portion 17b whose outer peripheral surface comes into close contact with the inner periphery 12a of the external contact 12. be.

Next, a manufacturing process of the through conductor 14 using the mold as described above will be explained.

■Second mold 17 with internal contact 9 external contact 1
Fix 2. At this time, the second mold 17 moves in the direction of the arrow and is separated from the first mold 16.

(2) When the above setting is completed, move the second mold 17 in the direction of arrow C and bring it into close contact with the first mold 16.

This allows the internal contacts 9 to be held in a non-contact state with the external contacts 12. In this state, the tip 17C of the convex portion 17b and the external contact 1
2 and the cylindrical protrusion 16d of the first mold 16 form a certain space.

(2) The heated and molten insulating resin is injected into this space through the gate 16a under pressure. As a result, the insulating resin is filled into the portion in the external contact 12 where the uneven portion (in this case, the recess 15) is formed, and the insulator 13 corresponding to the shape of the space is formed.

■Once the insulator resin has solidified with cold FJIL, the second mold 1
Move in the direction of the arrow 78 and take out the completed through conductor 14. Then, the feedthrough capacitor is completed by assembling the external metal fittings and the ceramic capacitor.

Now, the 6-unit condenser 1 as an example described in detail above.
According to this manufacturing method, the insulator 13 is molded while positioning the external contact 12 and the internal contact 9, so that the internal contact 9 can be aligned with the center of the external contact 12.

Therefore, it is possible to improve the dimensional accuracy, and the dimensional accuracy of ±0.1a++ can now be ensured by using the four methods shown in the figure, whereas the conventional method required an error of ±0.3#.

Furthermore, in the conventional manufacturing process, the time required for manufacturing cannot be shortened because the process proceeds in chronological order, but in the above manufacturing method, the process of press-fitting the internal contact 9 into the external contact 12 can be omitted, so that the manufacturing process can be reduced. It is also possible to reduce the time required.

In addition, as the press-fitting process can be omitted, there are no scratches or chips on the insulator during press-fitting, no racking due to the pressing force with the press-fitted external contact 7, and the metal ring that was previously required is also omitted. This makes it possible to meet the demand for cost reduction by reducing the number of parts, etc.

It should be noted that the present invention is not limited to the illustrated embodiments described above, and various modifications can be made within the scope of the gist thereof.

For example, as the uneven portion, a convex portion is provided on the insulator side and a recessed portion is provided on the external contact side.
Figure 4(a) is not limited to what is shown.
It is also possible to take the shapes shown in (C).

The insulator 18 shown in FIG.
8.18a. In this way, a plurality of convex portions, that is, uneven portions may be formed. In this case, the external contact is formed with four portions corresponding to the convex portions 18a, 18a.

The insulator 19 shown in FIG. 1B has a plurality of cylindrical convex portions 19a arranged at equal angular intervals on the outer peripheral surface of the insulator 19. In this case, a concave portion corresponding to the convex portion 19a is formed in the external contact.

The insulator 20 shown in FIG.
It is formed over the entire circumference.

As described above, even with the J-shaped insulator described in FIGS. 4(a) to 4(C), the same effects as in the above-described embodiment can be obtained.

[Advantageous Effects of the Invention 1] According to the present invention described in detail above, it is possible to provide a through-type condenser υ and a method for manufacturing the same, which improve dimensional accuracy and reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a through conductor as an example;
Figure (a) is an external perspective view of the internal contact and insulator shown in Figure 1, Figure (b) is a partial sectional view of the external contact,
Fig. 3 is an explanatory diagram showing a method of manufacturing the V-conductor shown in Fig. 1, Figs. 4(a) to (C) are explanatory diagrams showing other embodiments of the insulator shape, and Fig. 5 is an explanatory diagram showing a method for manufacturing the V-conductor shown in Fig. 1. FIGS. 6 to 8 are explanatory diagrams including a partial cross section of the feedthrough capacitor shown in FIG. 9... Internal contact, 12... External contact,
13... Insulator, 13a, 15... Uneven part. Figure 1 Figure 2D Figure 3 (G) (b) Figure 4 Figure 7A Figure 8

Claims (2)

[Claims] (1) In a feed-through capacitor equipped with a feed-through conductor that includes a cylindrical external contact and an insulator that insulates and supports the internal contact within the external contact, both A feed-through capacitor characterized by having correspondingly formed concave and convex portions to prevent fluctuations in the fixing position between the capacitors. (2) An internal contact is held in a cylindrical external contact having a concavo-convex portion formed on a part of its inner peripheral surface in a non-contact state with the external contact, and an insulator is placed in the concavo-convex portion of the external contact. A method for manufacturing a feedthrough capacitor, comprising the step of filling with resin.