Means for guiding the beam from the source to the record carrier or from the record carrier to the detector

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 > Means for guiding the beam from the source to the record carrier or from the record carrier to the detector

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 7/1353 Diffractive elements, e.g. holograms or gratings
• G11B 7/1356 Double or multiple prisms, i.e. having two or more prisms in cooperation
• G11B 7/1359 Single prisms
• G11B 7/1362 Mirrors
• G11B 7/1365 Separate or integrated refractive elements, e.g. wave plates
• G11B 7/1372 Lenses
• G11B 7/1381 Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
• G11B 7/1384 Fibre optics
• G11B 7/1387 using the near-field effect
• G11B 7/139 Numerical aperture control means
• G11B 7/1392 Means for controlling the beam wavefront, e.g. for correction of aberration
• G11B 7/1395 Beam splitters or combiners
• G11B 7/1398 Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section