Separate or integrated refractive elements, e.g. wave plates

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 > Separate or integrated refractive elements, e.g. wave plates

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 7/1367 Stepped phase plates
• G11B 7/1369 Active plates, e.g. liquid crystal panels or electrostrictive elements