Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-03-21
2006-03-21
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S120000, C369S112150
Reexamination Certificate
active
07016274
ABSTRACT:
An optical pickup comprises a light source, a three-way split light diffracting section for dividing light emitted from a light source into one main beam and two subbeams, a hologram for dividing each of the main beam and the subbeams reflected from a recording medium into two predetermined directions, and a light receiving section for receiving the beams divided by the hologram. The hologram includes two regions having a small-pitch grating for diffracting each beam to a predetermined direction, the small-pitch gratings have substantially the same pitch and are symmetrical about a split line separating the two regions.
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Japanese Office Action mailed Aug. 12, 2004, for Japanese Patent Application 2001-091492 filed Sep. 22, 1999, two pages.
Battaglia Michael V.
Miller Brian E.
Morrison & Foerster / LLP
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