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US 4,302,681 AGranted
Opto-electronic reading apparatus
AssigneeLaser-Scan Laboratories Limited
InventorsPeter A. Woodsford, Beverley M. Ewen-Smith
Life of this patent
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AssigneeLaser-Scan Laboratories Limited
InventorsPeter A. Woodsford, Beverley M. Ewen-Smith
Estimating the term…
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.
An opto-electronic reading apparatus comprising a light source arranged to illuminate a document disposed in a document holder a photo-electric detector to receive light reflected or transmitted by such a document, there being between the document holder and the detector a deflection system to direct light from various areas of the document holder into the detector and an optical system to produce a focussed image of the document holder at the detector, the apparatus also comprising a control device connected so as to control the angle through which the deflection system deflects light entering the system and hence, to control the area of the document holder from which light enters the detector, and a signal processor arranged to receive signals from the detector and to transform them into digital data.
An opto-electronic reading apparatus comprising:
Dependencies are inferred from the claim text.