Toner level sensor

Details Toner level sensor Toner level sensor

1986-11-05

1988-11-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

118712, 222DIG1, 355133, G01B 706

Patent

active

047868694

ABSTRACT:
A toner level sensor for detecting the presence or absence or the level of residual amount of the toner of an electronic copier or the like. In order to secure stable operation regardless of changes of external environmental conditions such as temperature and humidity, a pair of transformers are provided with primary coils and secondary coils respectively wound on magnetic cores having a magnetic gap. When a magnetic member is present in the vicinity of a magnetic gap, the phases of the outputs of the secondary coils are opposite to each other, so that the differential output of the secondary coils is phase detected to determine the presence or absence of the residual toner amount or the level of residual amount.

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