Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-12-20
1992-04-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502014, 358494, 346108, H01J 314
Patent
active
051030918
ABSTRACT:
A scanning optical apparatus according to the present invention comprises a light source, a modulator for modulating a light flux emitted from the light source, an image forming device for forming an image of the light flux from the light source to a predetermined position, a deflector for deflecting the light flux from the light source in a predetermined position, a photosensitive device for sensing the light flux deflected by the deflector, an adjusting device for adjusting an image forming position of the light flux by the image forming device in correspondence to a signal obtained by the photosensitive device and an inhibiting device when the light flux emitted from the light source is being modulated by the modulator in correspondence to a predetermined signal. By the scanning optical apparatus of the invention, the focal deviation can be always stably corrected and a stable image with high density can be obtained.
REFERENCES:
patent: 4386272 (1983-05-01), Check et al.
patent: 4404596 (1983-09-01), Juergensen et al.
patent: 4441126 (1984-04-01), Greenig et al.
patent: 4661699 (1987-04-01), Welmers et al.
patent: 4733064 (1988-03-01), Ishikawa
Arai Hitoshi
Hirose Yoshihiko
Canon Kabushiki Kaisha
Nelms David C.
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