Method and apparatus for detecting the focusing state and positi

Details Method and apparatus for detecting the focusing state and positi Method and apparatus for detecting the focusing state and positi

1986-12-18

1989-03-28

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 45, 369112, 250201, G11B 700

Patent

active

048170747

ABSTRACT:
In method and apparatus of detecting tracking and focusing errors in an optical recording system, such means for dividing light beam reflected from an optical recording medium into four light beams as a quadrant prism is utilized. The light beam dividing means is provided with four sections from which the four light beams radiate with four different directions on a plane including a common straight line so that two inner light beams are utilized to detect the focusing error while two outer light beams are utilized to detect the tracking error.

REFERENCES:
patent: 4560259 (1985-12-01), Humphrey
patent: 4631395 (1986-12-01), Ando
patent: 4719614 (1988-01-01), Leterme et al.
patent: 4730899 (1988-03-01), Kime et al.
Masayuki Inoue et al., Optical Head for an Optical Disk, 46th Scientific lecture meeting for Applied Physics Society, Autumn 1985.

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