Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1996-08-13

1998-03-03

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359208, 359212, 359216, 359217, G02B 2608

Patent

active

057241724

ABSTRACT:
An optical scanning apparatus is disclosed which comprises: a polygonal mirror for receiving a laser beam modulated by an image signal and for repetitively deflecting the laser beam by every line of the image signal; a single lens having spherical surfaces for receiving the deflected laser beam by the polygonal mirror; a planoconvex cylindrical lens having a refractive power only in a deflection direction of the laser beam with a convex surface of the planoconvex cylindrical lens being directed toward a plane to be scanned for receiving the laser beam which has passed through the single lens; and a concave cylindrical mirror having a refractive power only in a direction perpendicular to the deflection direction of the laser beam for reflecting the laser beam, which has passed through the planoconvex cylindrical lens, toward the plane to be scanned for forming an image. The second spherical surface of the single lens may be made aspheric. The single lens may be made of plastic.

REFERENCES:
patent: 4247160 (1981-01-01), Brueggemann
patent: 4512625 (1985-04-01), Brueggemann
patent: 4789230 (1988-12-01), Ohta
patent: 4796962 (1989-01-01), DeJager et al.

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