Objective lens and recording/reproducing apparatus

Details Objective lens and recording/reproducing apparatus Objective lens and recording/reproducing apparatus

1997-09-24

1999-03-09

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359719, G02B 1318

Patent

active

058808930

ABSTRACT:
A object of the present invention is to provide an objective lens that two non spherical surfaces are combined and a numeral aperture is more than 0.7, and to provide an optical pick-up apparatus which can be used for an optical recording medium having high information recording density by using this objective lens.
There is disclosed that a first surface is a rotating ellipse surface (a cone constant k: -1.ltoreq.k<0), and curvature of the first surface, glass materials (refractive index) of a first lens 1 and a main plane interval d of the total of combination of two lenses are properly established to satisfy the fixed relational expression.

REFERENCES:
patent: 5467225 (1995-11-01), Manabe
patent: 5475537 (1995-12-01), Kobayashi et al.
patent: 5491587 (1996-02-01), Iwaki et al.
patent: 5734512 (1998-03-01), Shin et al.

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