Original illumination device with an automatic illumination cont

Details Original illumination device with an automatic illumination cont Original illumination device with an automatic illumination cont

1986-07-02

1987-12-08

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 14R, 355 68, G03B 2772

Patent

active

047115696

ABSTRACT:
In an original illumination device with an automatic illumination control according to the present invention, light from an exposure lamp (6) illuminates an original (1) and a reference density plate provided on the lower surface of a table (2), reflected light from the original (1) is directed to a photosensitive drum (13), and reflected light from the original (1) and the reference density plate (3) is detected by a photo detector (14), whereby an MPU (17) controls power supply to the exposure lamp (6) by an exposure lamp regulator (19) based on the detection output of the photo detector (14). In addition, in case where a prescribed triggering signal is inputted to the exposure lamp regulator (19) and the photo detector (14) does not detect light, the MPU (17) determines that the exposure lamp (6) is broken, while in case where the prescribed triggering signal is not inputted to the exposure lamp regulator (19) and the photo detector (14) detects light, the MPU (17) determines that it is an abnormal lighting condition. Accordingly, the abnormal condition of the light source can be easily determined by a simple structure.

REFERENCES:
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4272183 (1981-06-01), Maese et al.
patent: 4551005 (1985-11-01), Koichi
patent: 4583839 (1986-04-01), Suzaki
patent: 4597662 (1986-07-01), Hirafa et al.

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