Optical pickup

Details Optical pickup Optical pickup

1994-12-22

1996-05-07

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369109, 369 4414, 369 4437, G11B 700

Patent

active

055153542

ABSTRACT:
The optical pickup of the invention includes a hologram mirror for directing an optical axis of a light beam emitted from a light source to be perpendicular to the recording face of a recording medium. The hologram mirror includes: a light transmissive substrate having a first surface and a second surface which are opposite to each other, the light beam from the light source entering the substrate from the first surface; a transmissive holographic element, formed on the first substrate, for diffracting the light beam incident thereon to generate a plurality of diffracted beams; and a reflective film, formed on the second surface of the substrate, for reflecting the diffracted beams, wherein the holographic element includes a blazed grating which is designed to make a predetermined one of the diffracted beams most intense.

REFERENCES:
patent: 4826270 (1984-05-01), Opheij et al.
patent: 4918679 (1990-04-01), Opheij et al.
patent: 5283771 (1994-02-01), Kadowaki et al.
patent: 5301182 (1994-04-01), Komma et al.
patent: 5400311 (1995-03-01), Komma et al.

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