1983-05-12
1986-11-04
Corbin, John K.
350412, G02B 2717, G02B 702
Patent
active
046207686
ABSTRACT:
An optical scanning system wherein a light beam from a laser source is reflected by a rotating polygonal mirror and focused by a scanning lens into a scanning beam spot on the drum surface. A cylindrical lens disposed between the scanning lens and the drum for correcting the unevenness of the scanning line pitch caused by the incline of the each facet of the polygonal mirror has a curvature in the scanning direction of the beam so that optimal focal points of the scanning beam spot align on a straight line.
REFERENCES:
patent: 4379612 (1983-04-01), Matsuoka et al.
patent: 4496209 (1985-01-01), Itoh et al.
Schroder, "Technische Optik", Vogel-Verlag, 9/1977, pp. 53-54.
Seiscor Industrial Products Section, "Toroidal Cylindrical Lens", 3/68, pp. 1-2.
Homma Yoshifumi
Kataoka Keiji
Ono Yoshifumi
Tatsuno Kimio
Corbin John K.
Gass Rebecca D.
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
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