JPH019143Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a case-built-in capacitor having a discharge resistor.

Generally, after a voltage is applied to a capacitor, a resistor is connected to discharge the charge, and even if the voltage is reduced to 0 [V], a certain voltage is restored and maintained after a certain period of time, which is a so-called recovery phenomenon.

Capacitors having such a re-electromotive voltage are difficult to handle and are likely to cause accidents such as electric shock to the human body or ignition of chemicals due to discharge during cleaning. Also,
When connected to electrical equipment, the spark phenomenon may damage other electronic components or cause malfunctions after connection.

In order to prevent such accidents, in a case built-in capacitor, a cylindrical discharge resistor 3 made of carbon or the like is usually connected between terminals 1 and 2 as shown in FIG. However, if the discharging resistor 3 is provided outside the case 4, it becomes difficult to attach the capacitor 5 to the equipment, and if the lead wires 6 and 7 are lengthened so that the discharging resistor 3 does not get in the way, it will come into contact with other electronic components. This may cause equipment failure. Further, when the discharge resistor is built into the case, there is a drawback that not only is manufacturing difficult, but the case becomes large, which prevents miniaturization of the device.

The object of the present invention is to improve the above-mentioned drawbacks, and to provide a case-built-in capacitor that is easy to manufacture, can be easily attached to electrical equipment without mistakes, and can be miniaturized.

In order to achieve the above object, the present invention provides a case built-in type capacitor, which is characterized in that a conductive sheet for discharging resistance is provided on the lid, and this conductive sheet is connected between the terminals. It provides capacitors.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

In FIG. 2, 11 is a capacitor element formed by laminating and winding aluminum electrode foil together with a separator, or by winding metallized paper, from which lead wires 12 and 13 are drawn out. Reference numeral 14 denotes a case made of metal such as aluminum, which houses the capacitor element 11, but synthetic resin such as epoxy resin may also be used. Reference numeral 15 is a lid for sealing the open end of the case 14, and a rubber-covered lid is used. 16 and 17 are terminals penetrating through this lid 15, and lead wires 12 and 1, respectively.
3 is connected. 18 is connected between the terminals 16 and 17 so as to be on the back side of the lid 15, and has a thickness of several tens to several hundred micrometers and a resistor of several tens to several
It is a conductive sheet with a resistance of about 100KΩ.

That is, the conductive sheet 18 is attached to the terminal 1 on the lid 15.
6 and 17 can be connected together when installing them, and they are used to seal the case 14 as they are. Unlike conventional discharge resistors, capacitor element 1
Manufacturing becomes easy without damaging the end face of 1.
Moreover, since the thickness of the conductive sheet 18 is as thin as micro units, the case 14 does not need to be large and can be downsized. In addition, it is easy to attach to equipment, prevents mistakes, and allows for miniaturization.

In addition, in the above embodiment, the conductive sheet 18
is provided on the inside of the lid 15, but it may be provided on the outside. In this case, there is an advantage that damage to the conductive sheet can be determined without disassembling the capacitor.

As described above, according to the present invention, since a conductive sheet is used as the discharge resistor, it is possible to obtain a case-built-in capacitor that is easy to manufacture and can be downsized. Moreover, it can be easily attached to electrical equipment without mistakes, and miniaturization is also possible.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional case built-in capacitor, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a back view of a lid used in the embodiment of the present invention. 11... Capacitor element, 14... Case, 1
5... Lid, 16, 17... Terminal, 18... Conductive sheet.

Claims (1)

[Scope of utility model registration request] In case-embedded capacitors, in which the capacitor element is built into the case and sealed with a lid provided with terminals, a conductive sheet is provided as a discharge resistor in the lid, and this conductive sheet is connected between the terminals. A case-built-in capacitor characterized by: