Scanning optical system and a scanning optical apparatus

Details Scanning optical system and a scanning optical apparatus Scanning optical system and a scanning optical apparatus

1998-08-26

2000-07-11

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359206, 359216, G02B 2608

Patent

active

060881461

ABSTRACT:
In a scanning optical system in which a plurality of light beams emitted from a plurality of light sources are, after being formed into beams converging in a predetermined manner, deflected by a single deflector and are then shone, through scanning lens systems provided one for each light beam, onto a scanned surface so that the scanned surface is scanned by the light beams for image formation, at least one of the scanning lens systems satisfies the condition 0<-{(L-HH')+k}/k.ltoreq.0.2, where L represents the distance from the point of deflection of the light beam to the scanned surface, HH' represents the distance from the front-side principal point to the rear-side principal point of the scanning lens system, and k (k<0) represents the constant of proportionality defined by the formula y'=k.theta., where y' represents the image height on the scanned surface in the main scanning direction, and .theta. represents the angle of deflection, that is, the angle that the light beam, after being deflected by the deflector, forms with respect to the optical axis of the scanning lens system.

REFERENCES:
patent: 5245462 (1993-09-01), Kanai et al.
patent: 5251055 (1993-10-01), Koide
patent: 5774249 (1998-06-01), Shiraishi et al.
patent: 5801746 (1998-09-01), Yamaguchi et al.

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