Objective lens and optical pickup device

Details Objective lens and optical pickup device Objective lens and optical pickup device

1999-03-30

2000-10-17

Ben, Loha

Optical: systems and elements

Lens

Annular zonal correcting

359719, 359721, 359738, 359741, 359743, 359565, 2502015, 369 4423, 369 4424, G02B 1300

Patent

active

061340553

ABSTRACT:
An objective lens for condensing a light beam, has at least one of annular grooves and ridges producing a phase difference. Each of the annular groove and ridge is formed concentrically on at least one of an incident surface which said light beam is introduced, and an emission surface which said light beam is emitted.

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patent: 5017000 (1991-05-01), Cohen
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patent: 5665957 (1997-09-01), Lee et al.
patent: 5777803 (1998-07-01), Ju et al.
patent: 5835283 (1998-11-01), Yamanaka
patent: 5969862 (1999-10-01), Maruyama

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