Optical disc addressing devices

An optical head comprises a light source emitting a light beam and an array of waveguides for the optical guidance of the light beam, such that the array of waveguides is disposed on a substrate and wherein the light beam can be switched by a switching means between separate channels in the array by...

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Bibliographic Details
Main Authors TAIT, WILLIAM, MOHAPATRA, SARAT K
Format Patent
LanguageEnglish
French
German
Published 16.07.1997
Edition6
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:An optical head comprises a light source emitting a light beam and an array of waveguides for the optical guidance of the light beam, such that the array of waveguides is disposed on a substrate and wherein the light beam can be switched by a switching means between separate channels in the array by means of an applied potential: An error tracking channel is provided, such that when the error tracking channel detects the misalignment of the optical head, a signal generated from the error tracking channel causes the optical head realign: Light directed into an optical dump channel is directly radiated into the substrate, or through the dump channel and then into the substrate: A first sensing means detects focussing and tracking errors, and a second sensing means senses and processes data read from the optical disc.
Bibliography:Application Number: EP19960121016