Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1994-11-09
2000-11-07
Patel, Harshad
Measuring and testing
Liquid level or depth gauge
Thermal type
355206, G01F 2300, G03G 2100
Patent
active
061420166
ABSTRACT:
Disclosed is a toner residual quantity detecting apparatus for detecting a residual quantity of toners in a developing unit. This toner residual quantity detecting apparatus has a temperature sensor, provided in the bottom of the developing unit, for generating an output proportional to a detected temperature and a detecting circuit for detecting the toner residual quantity from the output of the temperature sensor. This temperature sensor detects a difference between temperatures when covered with the toners and when not covered with the toners, thereby detecting the toner residual quantity.
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Kobayashi Kouji
Kojima Takeo
Sato Shinji
Shimura Michio
Tanaka Nobuyuki
Fujitsu Limited
Patel Harshad
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