Optical pickup apparatus and optimal light spot focusing method

Details Optical pickup apparatus and optimal light spot focusing method Optical pickup apparatus and optimal light spot focusing method

2007-10-09

2007-10-09

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S044370

Reexamination Certificate

active

10120786

ABSTRACT:
An optical pickup apparatus includes a first light source to emit a first light beam having a predetermined wavelength, a first optical path changer to change a proceeding path of the first light beam, an objective lens to focus the first light beam on a recording medium, a diffraction member to divide the first light beam reflected by the recording medium into five light regions, the diffraction member having a first diffraction region having a wide width in a direction corresponding to a tangential direction of the recording medium and second through fifth diffraction regions sequentially arranged around the outside of the first diffraction region in a direction corresponding to a radial direction of the recording medium, and a first photodetector having first through fifth light receiving portions to receive the first light beam reflected by the recording medium.

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patent: 6407967 (2002-06-01), Odajima et al.
patent: 2002-251753 (2002-09-01), None
Japanese Office Action dated May 24, 2005.

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