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

Introduced: September 1968

Last revised: January 2012

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

Scope Notes

Glossary: Head heads includes any means for converting sinusoidal or non-sinusoidal electric wave-forms into various of the optical condition of at least the adjacent surface of the record carrier, or vice versa. | Limiting references: Disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method | Application references: Associated working of cameras or projectors with sound-recording or -reproducing means Sound-recording combined with cinematography Subtractive cinematographic processes combined with sound-recording

8 direct subcodes

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