Optical data recording device

Details Optical data recording device Optical data recording device

1986-11-06

1988-12-06

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 350 372, G11B 7135, G02B 532

Patent

active

047899778

ABSTRACT:
An optical data recording device for focusing a laser beam on a recording medium for storing and reading out information therefrom. The device is characterized by using a high efficiency holographic grating as a polarization beam splitter. In a forward collimated light path the holographic grating diffracts a light beam from a laser on an objective lens. The beam is reflected from the surface towards the recording medium and transmitted through the grating onto a light detector. The grating further provides for correcting a typical elliptical light beam shape from the laser to a circular beam shape as well as for correcting the astigmatism typically found in the wave fronts emitting from a laser diode.

REFERENCES:
patent: 4306763 (1981-12-01), Huingard
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4458980 (1984-07-01), Ohki et al.
patent: 4497534 (1985-02-01), Sincerbox
patent: 4542492 (1985-09-01), Leterme et al.
patent: 4624526 (1986-11-01), Tsukai et al.
patent: 4641296 (1987-02-01), Mizunoe et al.

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