Optical pickup

Details Optical pickup Optical pickup

2010-04-21

2011-12-06

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S112010, C369S112030, C369S112100, C369S112150, C359S015000

Reexamination Certificate

active

08072867

ABSTRACT:
An optical-pickup hologram element has six regions on an x-y plane, divided as follows: the first region with a first line (an x-axis) and a second line that connects points (−xa, 0) and (−xb, yb); the second region with the first and second lines and a third line connecting points (xa, 0) and (xb, yb); the third region with the first and third lines; the fourth region with the first line and a fourth line connecting the point (xa, 0) and a point (xb, −yb); the fifth region with the first and fourth lines and a fifth line connecting the point (−xa, 0) and a point (−xb, −yb); and the sixth region with the first and fifth lines (xa<xb and −xb<−xa). The second and fifth, and the other regions are given astigmatism at different angles to the second line.

REFERENCES:
patent: 2007-164957 (2007-06-01), None

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