Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1991-03-14
1992-09-01
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
363 89, G03B 2772
Patent
active
051443643
ABSTRACT:
A power supply device includes a first output circuit for outputting a power supply voltage of a first potential, a second output circuit for outputting a power supply voltage of a second potential, a circuit for connecting the first and second output circuits, a circuit for applying a predetermined central potential to the connecting circuit, a circuit for generating a reference potential having a predetermined potential difference from the central potential, a circuit for generating a first detection potential corresponding to the first potential, a circuit for generating a second detection potential corresponding to both the first potential and the second potential, a circuit for controlling the first output circuit to minimize a potential difference between the first detection potential and the reference potential, a circuit for controlling the second output circuit to minimize a potential difference between the second detection potential and the central potential, and a circuit for forcibly changing at least one of the first detection potential and the reference potential using a predetermined control signal, so that both the first potential and the second potential change toward the central potential.
REFERENCES:
patent: 4234249 (1980-11-01), Weikel, Jr. et al.
patent: 4239373 (1980-12-01), Weikel, Jr. et al.
patent: 4320447 (1982-03-01), Krauss
patent: 4535341 (1975-08-01), Kun et al.
patent: 4855648 (1989-08-01), Yagasaki
Modern Electronic Circuits Reference Manual, copyright McGraw-Hill, Inc.
Hix L. T,.
Rutledge D.
Tokyo Electric Co. Ltd.
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