Optical pickup apparatus compatible with disks of various format

Details Optical pickup apparatus compatible with disks of various format Optical pickup apparatus compatible with disks of various format

1996-12-11

1998-09-01

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

058020357

ABSTRACT:
An optical pickup apparatus compatible with disks having different thicknesses is provided. The optical pickup apparatus includes an optical source, a beam splitter for changing the direction of the incident beam, an objective lens which is located between the optical source and the disk for focusing the incident beam to form an optical spot on the disk, and a photodetector for detecting information and error signals by receiving the beam which is reflected from the disk and passed through the beam splitter. A hologram optical element (HOE) is provided between the beam splitter and the photodetector for diffracting the beam reflected from the disk into a zero-order beam and a positive first-order beam. The photodetector includes a first photodetector and a second photodetector which receive the zero-order beam and the positive first-order beam, respectively.

REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5278817 (1994-01-01), Maeda et al.
patent: 5303221 (1994-04-01), Maeda et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5587981 (1996-12-01), Kamatani

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