Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1989-12-08
1992-01-14
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359217, 250236, G02B 2608
Patent
active
050815440
ABSTRACT:
An optical scanning apparatus includes a light source, an image forming optical unit, a deflection unit and an optical beam detection unit provided inside a deflection area of the optical beam, the optical beam detection unit receiving the optical beam and generating a synchronizing signal. The optical beam detecting unit includes a unidirectional converging optical unit. This unidirectional converging optical unit is provided on an optical path of the optical beam irradiating the scanned surface for further converging the optical beam in a direction perpendicular to the direction of scanning in addition to the convergence performed by the image forming optical unit, so that the optical beam irradiating a light receiving surface of the optical beam detection unit can be focused in advance of the light-receiving surface of the optical beam detection unit in the above direction. In consequence, the allowable range of a shift of the scanning path of the optical beam caused by the manufacturing errors of the deflection unit and of a shift of an optical axis caused by the fine adjustment errors or strains of the supporting members can be increased. It is thus possible to provide an optical beam scanning apparatus which has a simple configuration and which enables the accuracy with which the position of the optical beam is detected to be improved.
REFERENCES:
patent: 3973825 (1976-08-01), Starkweather
patent: 4247160 (1981-01-01), Brueggemann
patent: 4616132 (1986-10-01), Kessler
patent: 4720632 (1988-01-01), Kaneko
Homma Yoshifumi
Kikuchi Kazuo
Ben Loha
Hitachi , Ltd.
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