Toner end detection apparatus using ultrasonic sensor

Details Toner end detection apparatus using ultrasonic sensor Toner end detection apparatus using ultrasonic sensor

1990-04-18

1991-07-30

Grimley, A. T.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

355208, 355246, 118689, 118694, G03G 2100

Patent

active

050351982

ABSTRACT:
A toner end detection apparatus comprises a toner tank which accommodates a toner, a toner detection sensor which has a surface exposed within the toner tank and outputs a detection signal and made up of an ultrasonic sensor which oscillates at a predetermined frequency when no toner is adhered on the surface, a setting part for variably setting a set value, a measuring part for measuring an oscillation time of the toner detection sensor in response to the output detection signal of the toner detection sensor, and a discriminating part for discriminating a toner end based on a comparison of the set value which is set by the setting means and the oscillation time which is measured by the measuring means. The toner accommodated within the toner tank is less than a predetermined quantity when the toner end is detected.

REFERENCES:
patent: 4647180 (1987-03-01), Watanabe
patent: 4916488 (1990-04-01), Kimura

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