Optical: systems and elements – Collimating of light beam
Patent
1999-02-11
2000-08-15
Epps, Georgia
Optical: systems and elements
Collimating of light beam
359662, 359773, G02B 2730, G02B 300, G02B 934
Patent
active
061045411
ABSTRACT:
A collimator lens comprises, successively from a parallel luminous flux side, a positive lens, a cemented lens made of negative and positive lenses, a positive lens, and a negative lens, and satisfies a predetermined conditional expression, whereby, when carrying out multi-beam scanning, various kinds of aberration, such as image surface curvature amount in particular, are greatly reduced with respect to the respective light beams from individual light sources. Successively disposed from the parallel luminous flux side are a first lens L.sub.1 made of a biconvex lens having a surface with a stronger curvature directed onto the parallel luminous flux side, a second lens L.sub.2 made of a biconcave lens having a surface with a stronger curvature directed onto the parallel luminous flux side, a third lens L.sub.3 made of a biconvex lens having a surface with a stronger curvature directed onto the light source side, a fourth lens L.sub.4 made of a biconvex lens having a surface with a stronger curvature directed onto the parallel luminous flux side, and a fifth lens L.sub.5 made of a negative meniscus lens having a concave surface directed onto the parallel luminous flux side and a plane directed onto the light source side. The second lens L.sub.2 and the third lens L.sub.3 are cemented together. These lenses satisfy a conditional expression of 0.9<.vertline.F.sub.5 /F.sub.T .vertline.<2.5, where F.sub.5 is the focal length of the fifth lens L.sub.5, and F.sub.T is the focal length of the whole lens system.
REFERENCES:
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patent: 5386312 (1995-01-01), Spencer
patent: 5691835 (1997-11-01), Iizuka
patent: 5774279 (1998-06-01), Kiriki et al.
patent: 6014262 (2000-01-01), Noda
Epps Georgia
Fuji Photo Optical Co., Ltd.
Seyrafi Saeed
Snider Ronald R.
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