Optical information reproducing apparatus

Details Optical information reproducing apparatus Optical information reproducing apparatus

1990-02-23

1991-12-10

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 718

Patent

active

050724371

ABSTRACT:
To prevent a drop in signal level at high spatial frequencies, an optical information reproducing apparatus retrieves the primary output of light reflected from the surface of a recording medium. In the different embodiments of the invention, either a shield plate with a pinhole in the path of the light is provided, or a photodetector having a plurality of light-receiving elements is provided, a selection circuit being connected to the elements and selecting the highest output thereof.

REFERENCES:
patent: 4357533 (1982-11-01), Winslow
patent: 4517666 (1985-05-01), Ando
patent: 4682316 (1987-07-01), Tateoka et al.

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