Optical head device having a light splitter with a diffraction g

Details Optical head device having a light splitter with a diffraction g Optical head device having a light splitter with a diffraction g

1989-09-08

1991-09-24

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 700

Patent

active

050519743

ABSTRACT:
An optical head device comprises a light source, a light splitter for reflecting a light emitted from the light source by a first plane thereof to direct the light to an information carrier and transmitting the light from the information carrier through the first plane, a photo-detector for detecting the light from the information carrier, and a diffraction grating structure arranged on a second plane of the light splitter for diffracting the light transmitted through the first plane and directing it to the photo-detector.

REFERENCES:
patent: 3985443 (1976-10-01), Danielsoon et al.
patent: 3992574 (1976-11-01), Bouwhuis et al.
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4544269 (1985-10-01), Nose et al.
patent: 4591256 (1986-05-01), Matsumura
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4733065 (1988-03-01), Hoshi et al.

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