Optical pickup with a diffraction element consist of six...

Details Optical pickup with a diffraction element consist of six... Optical pickup with a diffraction element consist of six...

2005-06-21

2005-06-21

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120, C369S112150, C369S120000

Reexamination Certificate

active

06909687

ABSTRACT:
A six-segment holographic surface is divided into regions by dividing lines. A four-segment photodetection part is divided into four photodetection parts equal in area by a section line substantially parallel to the radial direction of an optical disk and a section line orthogonal thereto. A main light beam diffracted in the regions of the six-segment holographic surface are condensed as spots at positions apart from each other on opposite sides on a section line of the four photodetection parts, and the main beam diffracted in the regions is condensed as spots in the center of the photodetection parts of the four-segment photodetection part.

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Bernacki, et al. “Causes of focus-error feedthrough in optical-disk systems: astigmatic and obscuration methods,” Feb. 10, 1994, pp. 735-743, vol. 33, No. 5, Applied Optics.

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