Digitizing of recorded data

Details Digitizing of recorded data Digitizing of recorded data

1975-02-20

1976-10-26

Dixon, Harold A.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250556, G05B 100, G06K 500

Patent

active

039886107

ABSTRACT:
In a reading machine in which a record such as a film record is read by scanning with a monitoring beam which is then detected by a photo-sensor, a sheet of photo-sensitive material is placed against the record and after each part of the record has been read it is traced with an activating beam which activates the photo-sensitive material and thus changes the color or density of the line as seen when the combination of the record and the photo-sensitive film is observed. The part of the record which has been read can thereby be distinguished easily from that which is still to be read, eliminating risk of re-reading.

REFERENCES:
patent: 3651392 (1972-03-01), Frisch et al.
patent: 3883735 (1975-05-01), Murphy et al.

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