Information reading apparatus with a light beam scanning techniq

Details Information reading apparatus with a light beam scanning techniq Information reading apparatus with a light beam scanning techniq

1985-12-13

1988-01-19

Cardillo, Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

235487, 369112, 369121, 350 9613, 350 9614, G11B 7135, G11B 709, G02B 632

Patent

active

047208244

ABSTRACT:
An information reading apparatus for reading information includes a board having a plane optical waveguide and a light source on the board. Light beam emitted from the source is conducted by a first optical system to a predetermined direction through the waveguide. Part of the light beam is deffracted toward a second optical system by a surface elastic wave region formed in the waveguide. The second optical system conducts the light beam to an information recording region of a card through the waveguide and leads reflected light beam from the information recording region to a photodetector. The light beam not diffracted by the elastic wave region is conducted to a third optical system formed in the waveguide. The system conducts the light beam to a synchronizing signal recording region of the card and leads reflected light beam from the synchronizing signal recording region to a photodetector.

REFERENCES:
patent: 3858032 (1974-12-01), Scantlin
patent: 4145758 (1982-03-01), Drexler et al.
patent: 4237375 (1980-12-01), Granholm
patent: 4360728 (1982-11-01), Drexler
patent: 4394060 (1983-07-01), Verber et al.
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4523803 (1985-06-01), Arao et al.
patent: 4544835 (1985-10-01), Drexler
IBM Technical Disclosure Bulletin, Integrated Optic Read-Write Head, vol. 15, No. 8, Jan. 1973.

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