Opto-electronic reading apparatus

Details Opto-electronic reading apparatus Opto-electronic reading apparatus

1980-01-18

1981-11-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250234, 358285, 358293, H04N 110

Patent

active

043026818

ABSTRACT:
An apparatus for reading information and converting it into digital data comprises an illuminating means which illuminates a source document (10), an optical system (12) which enables light from different parts of the document to be focussed at a photoelectric detector (14) and a deflection system (13) which directs light from different parts of the document (10) into the detector (14). The optical system (12) comprises a concave lens which converts the source document into a smaller, curved image which can be scanned by the apparatus, and a doublet lens with two elements whose separation is varied by a control device (16) so as to compensate for variations in the distance of the document from the detector (14). The deflection system (13) is also directed by the control device (16) which may cause it to follow lines on the document (10) or to perform a raster scan. Signals from the detector (14) are passed to a signal processor (15) which converts them to digital form.

REFERENCES:
patent: 4220976 (1980-09-01), Rhyins et al.

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