Optical head with adjustable beam shaping element

Details Optical head with adjustable beam shaping element Optical head with adjustable beam shaping element

2006-12-05

2006-12-05

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112030, C369S112280

Reexamination Certificate

active

07145844

ABSTRACT:
An optical head by which a good detection signal can be obtained based on a zeroth-order diffracted beam and first-order diffracted beams is provided. The optical head includes: a shaping element for shaping a beam emitted from a light source; a converging element for converging the beam that has been shaped by the shaping element on an optical recoding medium; and a detector for detecting an electric signal based on a zeroth-order diffracted beam and a first-order diffracted beam contained in the beam that has been reflected by the optical recoding medium. The shaping element is provided in a swingable manner so that a distance between a spot position at which the zeroth-order diffracted beam is incident on the detector and a spot position at which the first-order diffracted beam is incident on the detector can be adjusted.

REFERENCES:
patent: 4969137 (1990-11-01), Sugiyama et al.
patent: 6201228 (2001-03-01), Yoshida
patent: 6392977 (2002-05-01), Ando et al.
patent: 6567366 (2003-05-01), Kim et al.
patent: 6744720 (2004-06-01), Ando
patent: 2002/0012314 (2002-01-01), Kim et al.
patent: 1210333 (1999-03-01), None

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