Scanning lens

Details Scanning lens Scanning lens

1996-12-12

1998-03-10

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, 359662, 359782, G02B 2608

Patent

active

057267928

ABSTRACT:
A scanning lens converges light deflected by a deflector onto a surface to be scanned, comprises a first lens having a negative power in both a main scanning direction and in an auxiliary scanning direction, a second lens having a positive power in both the main scanning direction and in the auxiliary scanning direction, a third lens having a positive power in both the main scanning direction and in the auxiliary scanning direction, and a fourth lens provided with a cylindrical surface having a negative power in the auxiliary scanning direction. The first, second, third and fourth lenses are arranged in this order from the deflector. The first, second and third lenses are formed so that curvature of field in the auxiliary scanning direction is reduced. A bow of an abaxial scanning line, which cannot be corrected by the first, second and third lenses, can be corrected by the cylindrical surface of the fourth lens.

REFERENCES:
patent: 4277128 (1981-07-01), Kawamura
patent: 4756584 (1988-07-01), Takanashi
patent: 5087983 (1992-02-01), Takahashi et al.
patent: 5194982 (1993-03-01), Morimoto
patent: 5453870 (1995-09-01), Iima

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