DEVELOPING DEVICE

PURPOSE:To accurately detect toner concentration by providing a heating device to a member for holding a toner concentration sensor and preventing the detection characteristic or the detected value of the toner concentration sensor from being influenced by temperature change. CONSTITUTION:When a mai...

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Bibliographic Details
Main Authors NAMEKATA SHINICHI, BISAIJI TAKASHI
Format Patent
LanguageEnglish
Published 26.07.1991
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MAGNETOGRAPHY
MEASURING
PHOTOGRAPHY
PHYSICS
TESTING
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Summary:PURPOSE:To accurately detect toner concentration by providing a heating device to a member for holding a toner concentration sensor and preventing the detection characteristic or the detected value of the toner concentration sensor from being influenced by temperature change. CONSTITUTION:When a main switch which is not shown in figure is turned on, the startup of respective parts necessary for development is executed and a heater 6 is turned on simultaneously with the startup. The energizing time of the heater 6 is set at a proper rate and the startup of the temperature of the bottom side part 1a of a developing device 1 is finished by the time when the startup of the respective parts is completed. Then, a thermistor 5 measures the temperature of the bottom side part 1a of the device 1 and the energizing time of the heater 6 is controlled by a CPU 8 in accordance with the measured value. Thus, the detection characteristic or the detected value of the toner concentration sensor is prevented from being influenced by the temperature change.
Bibliography:Application Number: JP19890310682