Light amount control apparatus

Details Light amount control apparatus Light amount control apparatus

1989-06-29

1991-11-12

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355228, 355 68, 355 69, G03G 1504, G03B 2772, G03B 2780

Patent

active

050651846

ABSTRACT:
A light amount control apparatus contains an exposure lamp, a photo sensor for receiving light from the lamp, an AC power source for applying an AC voltage to the lamp, a CPU for computing an electric power to be supplied to the exposure lamp in accordance with magnifications and optical densities of originals by using the data signal outputted from the photo sensor, a lamp regulator for control an electric power supplied to the exposure lamp by using a value computed by the CPU, and a zero-cross generator for causing the CPU to periodically perform the computation in synchronism with the AC voltage of AC power source applied to the lamp.

REFERENCES:
patent: 4573787 (1986-03-01), Sanbayashi et al.
patent: 4636063 (1987-01-01), Takai et al.
patent: 4661765 (1987-04-01), Bando et al.
patent: 4699502 (1987-10-01), Araki et al.
patent: 4702590 (1987-10-01), Usami
patent: 4855648 (1989-08-01), Yagasaki
patent: 4902936 (1990-02-01), Yamada
patent: 4910554 (1990-03-01), Noda

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