F.theta. lens and scanning optical system using the same

Details F.theta. lens and scanning optical system using the same F.theta. lens and scanning optical system using the same

1990-12-14

1992-08-04

Sugarman, Scott J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, 359218, 359784, G02B 2610, G02B 912

Patent

active

051364123

ABSTRACT:
An f.theta. lens having a skew correction function for use in a scanning optical system comprises a first lens having a negative power in a main scan plane, a second lens having a positive power in the main scan plane and arranged next to the first lens, a third lens having a toric plane and a positive power in the main scan plane and arranged next to the second lens, and an air lens formed between the first lens and the second lens having a positive power in the main scan plane.

REFERENCES:
patent: 4756583 (1988-07-01), Morimoto
patent: 4756584 (1988-07-01), Takanashi

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