Optical head having a beam cutting mirror with a total absorptio

Details Optical head having a beam cutting mirror with a total absorptio Optical head having a beam cutting mirror with a total absorptio

1993-09-22

1994-12-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4423, G01J 120

Patent

active

053748190

ABSTRACT:
An optical head which optically reads and writes signals recorded on a recording medium comprises a beam cutting mirror provided to the rear of a beam splitter and having a total reflection surface, a total absorption surface, and a polarizing surface, and a photodetector detecting incident beams. Since the photodetector and the light source are provided on two parallel light source, the optical head of the present invention can use a laser beam detector and a photodetector for detecting focussing signals, tracking signals, and information signals as one package, so as to bring a rapid improvement in miniaturization, lightweight, and compaction.

REFERENCES:
patent: 4817072 (1989-03-01), Toide et al.
patent: 5313441 (1994-05-01), Imai et al.

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