Optical disc player for optically reproducing recorded informati

Details Optical disc player for optically reproducing recorded informati Optical disc player for optically reproducing recorded informati

1987-08-12

1989-07-04

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 700

Patent

active

048457019

ABSTRACT:
In an apparatus for optically reproducing the recorded information, a circuit to reproduce an RF signal is provided. At least a pair of photo sensors are arranged adjacently in a direction parallel with a tangential line of a recording track of an information recording disc. A light beam is irradiated onto the recording surface of the disc and the reflected light from the recording surface is received by these photo sensor. The phases of both output signals of the photo sensors are made coincident by the phase shift means. The resultant output signals having the same phase are added thereby to form the RF signal. For this purpose, the phase difference between both output signals of the photo sensors is detected and either one of phases of the output signals is shifted in accordance with the phase difference detecting output.

REFERENCES:
patent: 4025784 (1977-05-01), Lehureau et al.
patent: 4366564 (1982-12-01), de Haan et al.
patent: 4539665 (1985-09-01), Iso et al.
patent: 4541084 (1985-09-01), Oku et al.
patent: 4542491 (1985-09-01), Takasayo et al.
patent: 4581728 (1986-04-01), Nakamura et al.

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