Collimator lens for optical pickup

Details Collimator lens for optical pickup Collimator lens for optical pickup

2007-07-17

2007-07-17

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Collimating of light beam

C369S044320

Reexamination Certificate

active

11277851

ABSTRACT:
A collimator lens located in a light path from a laser light source to an optical information recording medium. The collimator lens is constituted by a cemented lens which is composed of a biconvex lens and a meniscus lens, and an aspheric plastic lens in the form of a transparent thin synthetic resin film which is laminated on a lens surface of the biconvex lens on the side of or facing toward an optical recording medium. When calculated on the basis of a composite focal length f=10 mm, the collimator lens has an epaxial chromatic aberration correction rate (a) and a numerical aperture NA in the ranges of (1) (a) <2.2 μm
m and (2) 0.4>NA≧0.12, respectively.

REFERENCES:
patent: 5491587 (1996-02-01), Iwaki et al.

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