Optical unit for use in image-forming apparatus

Details Optical unit for use in image-forming apparatus Optical unit for use in image-forming apparatus

1991-02-22

1992-08-04

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G11B 7125

Patent

active

051361604

ABSTRACT:
In an optical unit, a light beam is emitted from a light source toward a given object. Part of the light beam is reflected by a reflecting mirror and is returned to a monitor diode which is incorporated in the light source. The reflecting mirror is arranged in an optical path along which the light beam is directed from the light source to the object, but is located outside of an image region containing an optical axis and expanding in the main scanning direction. By use of the light beam returned to the monitor diode, the deflection start position from which the light beam emitted from the light source is deflected is detected. In other words, the deflection start timing is detected. A variation in the monitor current produced by the monitor diode is utilized for controlling the light source, to thereby match the horizontal synchronization.

REFERENCES:
patent: 4447723 (1984-05-01), Neumann
patent: 4720632 (1988-01-01), Kaneko
patent: 4823002 (1989-04-01), Saito
patent: 4847492 (1989-07-01), Houki
patent: 4886963 (1989-12-01), Ohmori
patent: 4918306 (1990-04-01), Saito
patent: 4935615 (1990-06-01), Eiichi et al.
patent: 5016233 (1991-05-01), Morimoto et al.
L. P. Hayes, "Scanner For Opaque Samples." IBM Technical Disclosure Bulletin, vol. 16, No. 9 (Feb. 1974) pp. 2826-2828.

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