Lens for an optical disc recording and/or reproducing apparatus

Details Lens for an optical disc recording and/or reproducing apparatus Lens for an optical disc recording and/or reproducing apparatus

1991-07-17

1992-11-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359718, G02B 1318

Patent

active

051629496

ABSTRACT:
A single focusing lens for an optical disc recording and/or reproducing apparatus, wherein the lens two aspherical surfaces, has a large numerical aperture of about 0.6, and a focal length and a thickness that satisfy following formulas

REFERENCES:
patent: 4449792 (1984-05-01), Arai et al.
patent: 4657352 (1987-04-01), Suda et al.
patent: 4743093 (1988-05-01), Oinen
patent: 4765723 (1988-08-01), Takamura
patent: 4828373 (1989-05-01), Suda et al.
patent: 4932763 (1990-06-01), Matsuoka
patent: 5004330 (1991-04-01), Ishibal et al.
patent: 5015078 (1991-05-01), Oikawa
patent: 5087115 (1992-02-01), Ishibai et al.

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