Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-01-11
1991-11-19
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359217, G02B 2608
Patent
active
050660837
ABSTRACT:
The present invention relates to a scanning optical system and a scanning optical apparatus in which the pivot axis and the mirror surface of the deflector are inclined to have a predetermined relationship so as to obtain practical planeness of a surface to be scanned. A scanning optical system according to the present inhvention comprises a light source, lens for converging a light beam from the light source and a deflector for deflecting the light beam in a predetermined direction. In the optical scanning system according to the present invention, the maximum deflection angle of the deflector, a relationship between a radius of curvature of the deflection/reflection surface of the deflector and a distance between an object point of a light beam incident on the deflection/reflection surface of the deflector and the deflection/reflection surface for reflecting a central ray of the incident light beam, are determined to satisfy with a predetermined condition. And further, a relationship between an angle defined by a predetermined pivot axis of the deflector and the deflection/reflection surface of the deflector and an incident angle of the light beam from the light source to the deflection/reflection surface of the deflector within a plane including the predetermined axis and perpendicular to the deflection plane when the light beam emerging from the deflector is present within a single plane, is determined to satisfy with a predetermined condition.
REFERENCES:
patent: 3814494 (1974-06-01), Shiragai et al.
patent: 4256364 (1981-03-01), Minoura et al.
patent: 4627685 (1986-12-01), Sakuma
patent: 4758059 (1988-07-01), Sakuma
patent: 4915465 (1990-04-01), Sugiura
Makino Jun
Tateoka Masamichi
Ben Loha
Canon Kabushiki Kaisha
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