Dew sensor having a conductive power-containing moisture sensing

Details Dew sensor having a conductive power-containing moisture sensing Dew sensor having a conductive power-containing moisture sensing

1996-06-21

1998-03-10

Tso, Edward

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

H01C 700

Patent

active

057266220

ABSTRACT:
A dew sensor used in a video tape recorder, and the like, can be mounted on a printed circuit board remote from the cylinder. A pair of electrodes are formed on an insulated substrate, a moisture sensing material is disposed on the insulated substrate containing the pair of electrodes, and conductive powder is dispersed therein. The moisture sensing material is produced by reaction of a moisture absorbing resin having a hydrophilic group and an epoxy group, and a hardener containing a hydrazine derivative having a hydantoin skeleton, and, optionally, a long chain diamine compound.

REFERENCES:
patent: 4263576 (1981-04-01), Murata et al.
patent: 4386336 (1983-05-01), Kinomoto et al.
patent: 4433320 (1984-02-01), Murata et al.
patent: 4450429 (1984-05-01), Murata
patent: 5393404 (1995-02-01), Greenblatt et al.

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