JPH0356027Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a capacitor provided with a spark gap.

[Conventional technology]

Capacitors with spark gaps are guaranteed to withstand voltage up to a certain level, and are protected against higher voltages by providing a spark gap. Spark gaps are typically formed at intervals between the conductors that connect to the leads. The air around the spark gap expands during sparking, which can destroy the case in a sealed capacitor. Therefore, Figure 3a shows the spark gap exposed to the atmosphere.
External type devices such as C are well known. Figure a
As shown in the side view of Figure b, this capacitor has conductors 3 connected to each of the lead wires 2 in the stepped insulated part of the case 1, and their tips are spaced apart 4 to obtain a predetermined spark resistance voltage. . In the figure c, a rod-shaped conductor 7 is soldered to a lead wire 2 protruding from a case 6 in which a capacitor element 5 is housed, and the interval 4 between the tips is used as a spark gap.

[Problem that the invention attempts to solve]

As mentioned above, capacitors with a conductor that forms a spark gap attached externally to the case have high-voltage conductors other than the lead wire exposed to the outside, so there is a risk of electrical damage to the human body or surrounding parts. , restrictions arise due to equipment layout, etc.

Therefore, as shown in FIG. 3d, the capacitor element 5 is wrapped in a large case 8 and a space 8 for a spark gap is adjacent to the hardened part 8A with a filler.
B is provided, even if there is air expansion during sparking,
In some cases, the case 8 is protected from damage. However, it requires a considerable amount of space, and cannot be adopted from the viewpoint of miniaturizing electronic components.

Furthermore, in all of the capacitors mentioned above, the conductor forming the spark gap is connected to the lead wire by soldering or welding, which requires a lot of man-hours.

The purpose of this invention is to provide a capacitor with a spark gap that is safe because the spark gap is not exposed on the outside of the case, is not larger than conventional cases, and does not require soldering or welding to attach the conductor to the lead wire. The object of the present invention is to provide a capacitor having a structure that does not require extra man-hours.

[Means for solving the problem] The capacitor of the present invention has a shape in which the lead wires are drawn out facing each other in the same direction, and the lead lead-out part of the case is a lid made of an insulating plate. A conductor portion is provided on the surface of the insulating plate that will be inside the case and separated by a groove passing through the insulating plate, and each lead wire is connected to the conductor portion in the lead through hole of the insulating plate. The grooves are in contact with each other so as to form a spark gap.

[Effect]

On the side of the insulating plate that is inside the case, there are conductor sections, each conductor section being separated by a groove passing through the insulating plate, the groove forming a spark gap. The discharge voltage is determined by the width of the groove. Even if the conductor part is inside the case, the expanding gas when sparked escapes to the outside of the case through the groove.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the capacitor case consists of a case main body 11A (FIG. 1b) and a lid 11B (FIG. 1a), each of which has an open surface on which the capacitor element 10 is housed. The lid 11B has a shape in which a strip of metal conductor is cut with grooves 14 on one surface of an insulating plate, and has conductor portions 12a and 12b.
The groove 14 is a spark gap, and the pressure resistance is determined by the width. It is possible to obtain a withstand voltage of approximately 1KV per 1mm. Lead through holes 13a, 13b are provided in the conductor portions 12a, 12b.

Assembling the capacitor exterior is extremely easy.
The capacitor element 10 is stored in the case body 11A so that the lead wire 15 is on the open side, and after epoxy filling 100 is performed, the lid 11B is placed so that the surfaces of the conductor parts 12a and 12b face the inside of the case. Each lead wire 1 is inserted into the lead through hole 13a, 13b.
5 through each and press down, case body 11A
It is completed by fitting it into the FIG. 1c is a sectional view of the finished product. FIG. 2 illustrates the above assembly procedure including the manufacturing process of the lid 11B. As shown on the right side of FIG. 2, the lid 11B is made by etching the copper of the copper-clad laminate 101 to form a strip metal body 102, and then punching it out to form the strip grooves 14 and lead through holes 13a and 13b in one step. do.

As shown in the figure, the lid 11B is elastically fitted into a shallow notch provided at the periphery of the opening surface of the case body 11A by applying a little force from the top, and is fixed to the case body 11A. Fig. 2 c of forming the lid 11B
At the stage of punching, the lead through holes 13a, 1
Since the metal slightly covers the periphery of the lead wire 15, the lead wire 15 is inserted into the lead through holes 13a and 13b.
It makes electrical contact with the conductor parts 12a and 12b at the periphery of the conductor parts 12a and 12b.
Since this contact is not a soldered or welded connection, it may be unreliable at electrically low voltages, but is reliable at high voltages where sparking is a problem.

[Effect of idea]

In this invention, the conductor part that makes up the spark gap is provided on the insulating plate that is the lid of the case.
The shape of the capacitor becomes smaller. Furthermore, since the discharge conductor is provided inside the lid and the outside of the lid is an insulator, there is no risk of high voltage. Even if air expands during sparking, the air inside the case is in communication with the outside atmosphere through the grooves, and the case will not be destroyed due to air expansion.

Furthermore, the connection between the conductor part and the lead wire can be made naturally by simply passing the lead wire through the lead through hole in the lid and fitting the lid to the case, so there is no need for special processing such as soldering or welding. be. The electrical connection at this time is high voltage and reliable. In the embodiment, a copper-clad laminate was used as the lid material, but the conductor portion may be formed of any other material as long as it is an insulating plate with a conductor attached.

[Brief explanation of drawings]

Figures 1 and 2 relate to an embodiment of the present invention; Figure 1 shows the lid with the conductor section, a state in which the capacitor element is housed in the case body, and an assembled sectional view; Figure 2 shows the capacitor assembly procedure and FIG. 3, which is a diagram showing the lid forming procedure, is a diagram for explaining a conventional example. 10... Capacitor element, 11A... Case body, 11B... Lid, 12a, 12b... Conductor part,
13a, 13b...Lead through hole, 14...Spark gap, 15...Lead wire.

Claims (1)

[Scope of Claim for Utility Model Registration] In a capacitor whose lead wires are drawn out from the case in the same direction and facing each other, the lead-out part of the case is a lid that is an insulating plate, and the surface of the insulating plate that becomes the inside of the case. conductor portions are bonded thereon and separated by grooves passing through the insulating plate, each lead wire is in contact with each of the conductor portions in a lead through hole of the insulating plate, and the grooves are in contact with the spark gap. A capacitor with a spark gap characterized by forming a spark gap.