Objective lens system for optical recording and reading device

Details Objective lens system for optical recording and reading device Objective lens system for optical recording and reading device

1986-08-08

1988-05-03

Corbin, John K.

350478, G02B 1318, G02B 912

Patent

active

047416068

ABSTRACT:
The present invention provides an objective lens system specifically designed for optically recording and reading digital data on an optical disc. The lens system includes three lenses, with one of the lenses having an aspherical surface. The first lens element can have a positive power with a spherical surface on its light source side. The second lens element can have a positive refractive power while a third lens element can also have a positive refractive power. The lens system can fulfill the following conditions.

REFERENCES:
patent: 3877792 (1975-04-01), Cox et al.
patent: 4525824 (1985-06-01), Hatano et al.
patent: 4645311 (1987-02-01), Rothe
Kuttner, Paul, "Optical Systems for Optical Disk Technology".
Kuttner, Paul, "Design and Testing of Lenses for Optical Disk Technology".

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