Optical head and optical disk apparatus

Details Optical head and optical disk apparatus Optical head and optical disk apparatus

2005-09-27

2005-09-27

Hindi, Nabil Z. (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112010, C369S112100

Reexamination Certificate

active

06950376

ABSTRACT:
A light beam is applied to an optical disk through a first hologram and an objective lens. The first hologram has a first region that can diffract light and a second region that can diffract light. The light beam reflected from the optical disk is applied through the objective lens to a second hologram. The second hologram splits the light beam into a first light beam and a second light beam that have passed through the first region and the second region, respectively.

REFERENCES:
patent: 5815293 (1998-09-01), Komma et al.
patent: 8-240718 (1996-09-01), None
patent: 11-195229 (1999-07-01), None
patent: 2000-11402 (2000-01-01), None
patent: 2000-76665 (2000-03-01), None

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