Scanning lens system and optical scanning apparatus using the sa

Details Scanning lens system and optical scanning apparatus using the sa Scanning lens system and optical scanning apparatus using the sa

1995-02-22

1997-12-09

Hellner, Mark

Optical: systems and elements

Prism

With reflecting surface

359719, 359223, G02B 2608, G02B 1318

Patent

active

056966210

ABSTRACT:
A scanning lens system includes a lens having two lens surfaces. The center thickness of the lens is varied in conformity with the error of the curvatures of the two lens surfaces. When the radii of curvature of the lens surfaces on a light deflector side and a surface to be scanned side in the sub-scanning cross-section are R.sub.a and R.sub.b, respectively, and the center thickness of the lens is d and the reflective index of the material of the lens for a wavelength .lambda. used is N, constant K is obtained by K=(1/R.sub.a -1/R.sub.b)+(N-1)d/(NR.sub.a R.sub.b). The center thickness d of the lens is varied in conformity with the radii of curvature R.sub.a and R.sub.b so that the constant value K may be within .+-.2% relative to a reference value.

REFERENCES:
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patent: 5162949 (1992-11-01), Kubota
patent: 5329406 (1994-07-01), Nakanishi et al.
patent: 5371632 (1994-12-01), Naiki et al.
patent: 5384659 (1995-01-01), Shikama et al.
patent: 5467225 (1995-11-01), Manabe

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