Collimator lens and light-scanning apparatus using the same

Details Collimator lens and light-scanning apparatus using the same Collimator lens and light-scanning apparatus using the same

1999-03-30

2000-05-09

Epps, Georgia

Optical: systems and elements

Collimating of light beam

359206, 359666, G02B 2730

Patent

active

060611839

ABSTRACT:
Disclosed is a collimator lens adapted to secure required brightness and back focus and favorably correct off-axis aberrations while in a simple configuration, which is also applicable to a multi-beam scanning optical system. The collimator lens comprises, successively from a parallel luminous flux side, a first lens L.sub.1 and a second lens L.sub.2, each made of a positive meniscus lens having a convex surface directed onto the light source side, in which the surface of the first lens L.sub.1 on the parallel luminous flux side is formed as an aspheric surface; while satisfying the following conditional expression (1):

REFERENCES:
patent: 5270851 (1993-12-01), Makino et al.
patent: 5633736 (1997-05-01), Griffith

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