Method and means for reading electronic signal patterns stored o

Details Method and means for reading electronic signal patterns stored o Method and means for reading electronic signal patterns stored o

1990-01-30

1991-07-02

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369101, 369 97, 365118, 346158, 3461531, G11B 1108

Patent

active

050291564

ABSTRACT:
A scanning system for optoelectronically recorded signal patterns stored in a plural layer medium consisting of inorganic materials throughout and featuring a dielectric storage layer at the surface which faces an electron beam source. The source beam first searches for a position mark associated with an image frame on the medium in order to establish a precise home position of the beam and associated coordinate axes prior to commencing the scan operation on that medium frame. Then the beam scans a raster on the medium spending a certain dwell time at each resolution element of the raster. Each time a frame is reached, the system is capable of altering the beam current in response to a pre-recorded exposure code in order to achieve the optimal retrieval of all information stored image-wise within said frame. The system then collects electrons emitted from the medium due to the scanning beam in a collector, which incorporates a highly sensitive amplifier, for further processing, with the medium being movable frame by frame as desired.

REFERENCES:
patent: 4059827 (1977-11-01), Byatt

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