Photocopying – Contact printing – Light boxes
Patent
1989-02-24
1992-04-21
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355246, G03G 2100
Patent
active
051073013
ABSTRACT:
An image forming apparatus includes an automatic toner supplier for detecting a toner density using a toner sensor and automatically supplying a toner when the toner density is decreased. The toner sensor is automatically initialized when initial use of the image forming apparatus is started so as to generate an analog voltage signal having a predetermined level corresponding to a reference toner density. That is, an output voltage from the toner sensor is converted into a digital signal by an analog/digital (A/D) converter. A comparator compares this digital signal with a reference voltage corresponding to the reference toner density. An arithmetic-logic unit adds/subtracts a digital adjustment value in accordance with a comparison result from the comparator. This adjustment value is converted by a digital/analog (D/A) converter into an analog control voltage signal and is applied to the toner sensor. That is, the control voltages are converged by a loop including the toner sensor, the A/D converter, the comparator, the arithmetic-logic unit, and the D/A converter so as to set the output voltage signal from the toner sensor at the predetermined level corresponding to the reference toner density.
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patent: 4592645 (1986-06-01), Kanai et al.
patent: 4901115 (1990-02-01), Nakamura et al.
patent: 4916488 (1990-04-01), Kimura
patent: 4932356 (1990-06-01), Watanabe et al.
patent: 4975742 (1990-12-01), Tada et al.
Braun Fred L.
Kabushiki Kaisha Toshiba
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