Optical pickup for recording/reproducing double-sided disc

Details Optical pickup for recording/reproducing double-sided disc Optical pickup for recording/reproducing double-sided disc

1995-12-27

1997-11-04

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4438, G11B 700

Patent

active

056847815

ABSTRACT:
To record/reproduce a double-sided disc, in an optical pickup, a first and a second laser beams spaced each other are irradiated from a first and a second laser sources toward a square pillar-shaped prism. The two laser beams are reflected from two neighboring faces of a longitudinal direction of the square pillar-shaped prism respectively, toward opposite directions from each other. The reflected beams respectively proceed to recording faces of the double-sided disc which are to be disposed opposite to each other with the square pillar-shaped prism in the center. The beams reflected from the recording faces of the double-sided disc are returned to the prism. The returned beams are received on a first and a second photodetector, and thereby, record/reproduction of information and tracking and focusing are carried out.

REFERENCES:
patent: 4667316 (1987-05-01), Suda et al.
patent: 4771413 (1988-09-01), Nago
patent: 4959822 (1990-09-01), Pasman et al.
patent: 5339300 (1994-08-01), Akatsuka et al.

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