Optical pickup

Details Optical pickup Optical pickup

1994-03-31

1996-06-25

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369124, 369 4412, G11B 700

Patent

active

055306896

ABSTRACT:
There is provided an optical pickup for use with an optical disk, which is capable of detecting tracking error signals and focusing error signals with good precision even when applied to the SCOOP method, and includes a light-emitting device having a light-emitting portion on a substrate for emitting light onto the optical disk, the light reflected by the optical disk being made to return to the light-emitting portion to vary oscillation of the light-emitting portion such that a signal recorded in the optical disk is read on the basis of a variation in the oscillation of the light-emitting portion, wherein an optical path length between the light-emitting device and the optical disk is set such that an interference intensity of interference fringes at a distance twice as large as the optical path length is at most one-tenth as large as a peak value of an interference intensity of interference fringes of a maximum intensity.

REFERENCES:
patent: 5065380 (1991-11-01), Yokota
patent: 5233444 (1993-08-01), Musha et al.
patent: 5270996 (1993-12-01), Ono
patent: 5408450 (1995-04-01), Nagahama et al.

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