Lens, optical head apparatus, and objective lens for the...

Details Lens, optical head apparatus, and objective lens for the... Lens, optical head apparatus, and objective lens for the...

2007-12-04

2007-12-04

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S122000

Reexamination Certificate

active

10833680

ABSTRACT:
A common objective lens typically used in reading data from different optical data storage media that are responsive to laser beams of different wavelengths, such as CD and DVD is provided. The lens has a refracting surface with inner and outer refracting surface regions. Diffraction gratings are provided in both the inner and outer refracting surface regions with each having a differential optical path function. The inner diffraction grating and at least a part of the outer diffraction grating emit an order of diffracted beams which have different polarities to cancel out any spherical aberrations caused by a change in temperature.

REFERENCES:
patent: 4983017 (1991-01-01), Tsuji et al.
patent: 6091544 (2000-07-01), Hasegawa et al.
patent: 2002/0141319 (2002-10-01), Matsumura et al.
patent: 2005/0008889 (2005-01-01), Hayashi et al.
patent: 09-12027 (1997-05-01), None
patent: 2000-081566 (2000-03-01), None

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