Diffraction grating and optical pickup apparatus with diffractin

Details Diffraction grating and optical pickup apparatus with diffractin Diffraction grating and optical pickup apparatus with diffractin

1994-11-14

1996-03-26

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369112, 359572, 359573, 359575, G11B 700, G02B 518

Patent

active

055027075

ABSTRACT:
An optical pickup apparatus in which light from a light source is led to an information medium and reflected light from the information medium is led to a hologram to be incident as a +1st order diffraction beam on a photodetector to obtain information signals. The hologram has a stair-like cross-sectional configuration, and a ratio of the width of a step of the stair-like cross-sectional configuration relative to a grating pitch of the hologram is arranged to vary in accordance with a position within a surface of the hologram.

REFERENCES:
patent: 5111448 (1992-05-01), Komma et al.
patent: 5113067 (1992-05-01), Nakai et al.
patent: 5221835 (1993-06-01), Setani
patent: 5227915 (1993-07-01), Grossinger et al.

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