Optical pick-up

Details Optical pick-up Optical pick-up

2007-10-09

2007-10-09

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S053230, C369S112010

Reexamination Certificate

active

10986037

ABSTRACT:
A finite optical system that a laser beam from a light source is allowed to be directly incident on an objective lens without passing a collimate lens is employed. The reference position of the objective lens is set so that converged light from the objective lens forms a focal point on a recording layer remoter from the light source of two recording layers in an optical disk. The objective lens moves in a direction of the light source side from the reference position to perform a focusing operation and read information recorded on the recording layer nearer to the light source.

REFERENCES:
patent: 6496454 (2002-12-01), Nakano
patent: 6700845 (2004-03-01), Sako et al.
patent: 05-101398 (1993-04-01), None
patent: 2000-306252 (2000-11-01), None
patent: 2002-352469 (2002-12-01), None
patent: A-2002-373442 (2002-12-01), None
patent: A-2002-373444 (2002-12-01), None

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