Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1995-11-28

1997-06-17

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, 359216, 359217, 359662, 359717, G02B 2608

Patent

active

056402651

ABSTRACT:
This invention discloses an optical scanning apparatus which gives an F-.theta. function by means of an axis-symmetric aspherical lens serving as a scanning lens and facilitates the manufacture, assembly and adjustment of the lens by providing a cylindrical lens between a rotating polygon mirror and the axis-symmetric aspherical lens. According to this invention, two lenses which may be injection moulded and use plastic material form an optical scanning system. The cylindrical lens of these two lenses is located between the rotating polygon mirror and the scanning lens for image-forming light in the subscanning direction, the scanning lens of these two lenses is located between the cylindrical lens and the image formation plane for image-forming light in the mainscanning direction. Also, magnification of the mainscanning direction and that of the subscanning direction are independent.

REFERENCES:
patent: 3750189 (1973-07-01), Fleischer
patent: 4775205 (1988-10-01), Muramatsu
patent: 5179465 (1993-01-01), Kondo

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