Collimating lens for optical system using semiconductor laser
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsMakoto Iwaki, Koichi Maruyama, Makoto Iki
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Abstract
A collimating lens system comprises a chromatic aberration correction element and a converging lens which has both surfaces formed of a convex aspherical surface. The converging lens has no aberrations except chromatic aberration. The chromatic aberration correction element has small refractive power adapted to correct a chromatic aberration of the converging lens, and the element is constructed of positive and negative lenses cemented to each other. The positive lens and the negative lens have almost the same refractive index, and have different dispersion.
Claims11
A collimating lens system for an optical system using a laser, for collimating a divergent beam of light, said collimating lens system comprising:
- a converging lens which has both surfaces formed as aspherical surfaces;
- and
- a chromatic aberration correction element adapted to correct a chromatic aberration of said converging lens, said element being constructed of positive and negative lenses cemented to each other, said positive lens and said negative lens having substantially the same refractive index, and having different dispersion.
A collimating lens system for an optical system using a laser.
An optical system using a laser and comprising an objective lens and a collimating lens system, said collimating lens system comprising:
- a converging lens which has both surfaces formed as aspherical surfaces;
- a chromatic aberration correction element adapted to correct a chromatic aberration of said converging lens, said chromatic aberration correction element being constructed of positive and negative lenses cemented to each other, said positive lens and said negative lens having substantially the same refractive index, and having different dispersion.
Dependencies are inferred from the claim text.