Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Full Title

Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor > Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Classification Context

Section:

PHYSICS

Class:

INFORMATION STORAGE

Subclass:

INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

Child Classifications

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• G11B 7/121 Protecting the head, e.g. against dust or impact with the record carrier
• G11B 7/122 Flying-type heads, e.g. analogous to Winchester type in magnetic recording
• G11B 7/123 Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
• G11B 7/125 Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
• G11B 7/13 Optical detectors therefor
• G11B 7/135 Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
• G11B 7/14 specially adapted to record on, or to reproduce from, more than one track simultaneously
• G11B 7/22 Apparatus or processes for the manufacture of optical heads, e.g. assembly