Optical reproducing apparatus

Details Optical reproducing apparatus Optical reproducing apparatus

1989-11-21

1991-07-02

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, 369109, 369103, 3501622, 2502015, G11B 700

Patent

active

050291548

ABSTRACT:
An optical reproducing apparatus has a dual grating provided with a substrate, a first diffraction grating and a second diffraction grating. The first grating receives an incident light reflected from an optical recording medium and separates the reflected light into a first transmitted light and a first diffracted light. The second grating receives the first transmitted light and the first diffracted light through the substrate and discharges a second diffracted light and a second transmitted light. A tracking error signal detector detects a tracking error signal by receiving one of the second transmitted light and the second diffracted light. A focusing error signal detector detects a focusing error signal be receiving the other of the second transmitted light and the second diffracted light.

REFERENCES:
patent: 4729640 (1988-03-01), Sakata
patent: 4894815 (1990-01-01), Yamanaka
patent: 4918679 (1990-04-01), Opheij et al.

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