Optical pickup

Details Optical pickup Optical pickup

1997-09-11

1998-09-08

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369103, 369112, G11B 700

Patent

active

058055576

ABSTRACT:
There is provided an optical pickup which comprises a light source, an objective lens for converging a beam from the light source onto an optical disc, a diffraction grating for passing a beam returning from the optical disc, a photo-detector for receiving returning beams passing through the diffraction grating. The diffraction grating is divided into two areas, each area including alternatively arranged first diffraction grating pattern and second diffraction grating pattern.

REFERENCES:
patent: 5627812 (1997-05-01), Yamamoto et al.
patent: 5652744 (1997-07-01), Freeman et al.

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