Laser scanner and scanning lens

Details Laser scanner and scanning lens Laser scanner and scanning lens

1995-10-05

1997-12-23

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, 359216, G02B 2608

Patent

active

057011907

ABSTRACT:
Rays of light from a laser light source are permitted to form a line image at a reflecting face of a rotating polygonal mirror via a line image forming optical member and the rays of reflected light from the reflecting face are focused by a scanning lens system to scan over the surface to be scanned. The scanning lens system comprises a cylindrical lens having a positive power that is located in the nearest position to the surface to be scanned and an aspheric lens at least one surface of which has such a profile that the radius of its curvature in a direction normal to the scan direction increases from the central portion to either end portion.

REFERENCES:
patent: 4561717 (1985-12-01), Kataoka et al.
patent: 4882483 (1989-11-01), Mochizuki et al.
patent: 5025268 (1991-06-01), Arimoto et al.
patent: 5052767 (1991-10-01), Sugata et al.
patent: 5245462 (1993-09-01), Kanai et al.
patent: 5270850 (1993-12-01), Mochizuki et al.

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