Objective lens for an optical disk drive

Details Objective lens for an optical disk drive Objective lens for an optical disk drive

1994-11-01

1995-11-14

Epps, Georgia Y.

Optical: systems and elements

Lens

Microscope objective

359656, 359717, 359719, 359793, 359795, 359796, G02B 2102, G02B 302, G02B 904

Patent

active

054672252

ABSTRACT:
An optical lens for an optical disk drive suppresses a chromatic aberration to a sufficiently small level and attain a numerical aperture of as large as 0.55. It comprises a biconvex positive lens and a meniscus negative lens arranged in this order as viewed toward an optical disk to form a two-piece cemented lens system. The cementing surface is spherical and other surfaces are aspherical. The lenses meet the conditions of:

REFERENCES:
patent: 4572623 (1986-02-01), Tanaka et al.
patent: 4721373 (1988-01-01), Sugiyama
patent: 5173809 (1992-12-01), Iwaki et al.
patent: 5204782 (1993-04-01), Mercado et al.
patent: 5210646 (1993-05-01), Hercado et al.

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