High-voltage variable resistor unit

Details High-voltage variable resistor unit High-voltage variable resistor unit

1995-01-24

1996-04-16

Lateef, Marvin M.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338 70, 338219, 338162, H01C 1030, H01C 1300

Patent

active

055086780

ABSTRACT:
A high-voltage variable resistor unit including a variable resistance circuit board and a fixed resistance circuit board, and capable of being down-sized and exhibiting satisfactory dielectric strength. A variable resistance circuit board which is provided on a front surface thereof with a variable resistance circuit pattern is received in a board receiving chamber of an insulating casing. A lid member made of an insulating resin material is arranged so as to close an opening of the board receiving chamber while keeping a front surface thereof facing a rear surface of the variable resistance circuit board. A fixed resistance circuit board is fixed on a rear surface of the lid member while keeping a rear surface thereof facing the rear surface of the lid member. A space for charging an insulating resin material therein is defined between a circuit board and the rear surface of the lid member. The lid member is provided on the rear surface thereof with both a creeping distance increase recess and a creeping distance increase projection in a manner to surround the circuit board.

REFERENCES:
patent: 4402037 (1983-08-01), Iwamura et al.
patent: 4471339 (1984-09-01), Fukada et al.
patent: 4527147 (1985-07-01), Arakawa
patent: 4527229 (1985-07-01), Imamura et al.

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