Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1984-12-20
1986-11-18
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 44, G11B 700
Patent
active
046237844
ABSTRACT:
A laser recording apparatus for optically recording information on a medium. A laser radiates a beam through an off-center lens. The lens deflects and focusses the beam onto a recording medium at a slight angle. The reflected beam returns through the lens on the opposite side of the optic axis from the incident beam. A mirror in the optical path directs the beam to a photodetector. The apparatus has broadband capabilities and is particularly useful at eliminating unwanted optical feedback when recording onto media having a birefringent protecting layer. Recording errors due to dirt and scratches may be detected by a second embodiment that has two lasers emitting light of different frequencies which upon reflection are detected and compared.
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patent: 4283777 (1981-08-01), Curry et al.
patent: 4345321 (1982-08-01), Arquie et al.
patent: 4458980 (1984-07-01), Ohki et al.
patent: 4581728 (1986-04-01), Nakamura et al.
patent: 4592038 (1986-05-01), Kabota et al.
Haddock Richard
Lichtenstein Terri
Drexler Technology Corporation
LaRoche Eugene R.
Mis D.
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