Apparatus for detecting remaining quantity of toner in electroph

Details Apparatus for detecting remaining quantity of toner in electroph Apparatus for detecting remaining quantity of toner in electroph

1979-07-20

1982-02-02

Braun, Fred L.

Measuring and testing

Liquid level or depth gauge

118694, 355300, G01F 2328, G03G 1500

Patent

active

043133436

ABSTRACT:
An apparatus for detecting the amount of toner in the supply hopper of an electrophotographic copying machine includes a transmitting element in the hopper for generating an ultrasonic acoustic wave and a receiving element in the hopper in operative relation to the transmitting element for receiving the ultrasonic acoustic wave reflected from toner in the hopper, the magnitude of the reflected wave being representative of the level of toner contained in the hopper.

REFERENCES:
patent: 2709918 (1955-06-01), Yetter
patent: 2799157 (1957-07-01), Pohlman
patent: 3223964 (1965-12-01), Stadlin
patent: 3859846 (1975-01-01), Asada et al.
patent: 4133453 (1979-01-01), Ohbora
patent: 4159786 (1979-07-01), Biddle et al.
patent: 4174902 (1979-11-01), Hamaguchi

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