Optical information reading apparatus with controlled numerical

Details Optical information reading apparatus with controlled numerical Optical information reading apparatus with controlled numerical

1993-08-26

1994-11-15

Nelms, Davic C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369100, 3692754, G01J 120

Patent

active

053650522

ABSTRACT:
A reflected beam from a reflective film of an optical disk exhibiting light intensity dependency is efficiently received. In the optical system, a collimator lens, a polarization beam splitter, a quarter wave plate and an objective lens are disposed in turn in an optical path between a laser and an optical disk from the laser side. A light receiver is disposed on another optical path extending from the polarization beam splitter. A light receiving aperture diameter of the objective lens for passing the reflected beam from the optical disk therethrough is made larger than an incident aperture diameter of the objective lens for impinging the reading beam on the recording medium. This structure enables information signals to be recorded at higher density on the recording medium to be reproduced.

REFERENCES:
patent: 4633451 (1986-12-01), Ahn et al.

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