Collimator lens and optical scanner device which uses such colli

Details Collimator lens and optical scanner device which uses such colli Collimator lens and optical scanner device which uses such colli

1998-12-08

2000-01-11

Nelms, David

Optical: systems and elements

Collimating of light beam

359205, 359659, 359662, 359739, 359763, 359770, G02B 2730, G02B 2608, G02B 2102, G02B 900

Patent

active

060142626

ABSTRACT:
A collimator lens having five lens elements of negative, negative, positive, positive, and negative refractive power, in order from a collimated luminous flux side of the collimator lens, and designed to have a large back focus, to thereby prevent heat from the light source from causing aberrations in the collimator lens. The collimator lens includes a negative first lens element L.sub.1 of a meniscus shape with its concave surface on the collimated luminous flux side, a positive fourth lens element L.sub.4 with a convex surface on the collimated luminous flux side, and a negative fifth lens element L.sub.5 with a concave surface on the collimated luminous flux side. In addition, a diaphragm stop is arranged on the collimated luminous flux side of the first lens element, and certain conditions are satisfied to reduce aberrations and provide a large back focus.

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