Optical pickup system with light receiving portion

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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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.

REFERENCES:
patent: 4665310 (1987-05-01), Heemskerk
patent: 4904856 (1990-02-01), Nagahama et al.
patent: 4908506 (1990-03-01), Coops et al.
patent: 5428595 (1995-06-01), Yoshida et al.
patent: 5579298 (1996-11-01), Opheij et al.
patent: 5594712 (1997-01-01), Yang
patent: 5644563 (1997-07-01), Yang
patent: 5672812 (1997-09-01), Meyer
patent: 6125087 (2000-09-01), Ohnishi et al.
patent: 02-192035 (1990-07-01), None
patent: 2000-322763 (2000-11-01), None
Japanese Office Action mailed Aug. 12, 2004, for Japanese Patent Application 2001-091492 filed Sep. 22, 1999, two pages.

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