Optical mark reader head for document markings

Details Optical mark reader head for document markings Optical mark reader head for document markings

1985-04-24

1987-03-03

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, 250239, H01J 516, H01J 502

Patent

active

046477667

ABSTRACT:
In an optical mark reader head comprising a light source (57) and two photosensors (58, 59) coupled to light transmission means forming a light emitting head (7) bracketed by two receiving heads (8, 9), all facing the document, and further comprising an analog processing circuit board (50) for the photosensor signals, supporting the light source and the photosensors. The invention provides transmission means in the form of rigid, preformed optical conduits (27, 28, 29) individually assembled and arranged relative to one another and together with the other reader head components in a single, flat case (1).

REFERENCES:
patent: 3503666 (1970-03-01), Moore et al.
patent: 3868514 (1975-02-01), Israelsson
patent: 4288701 (1981-09-01), Hill
IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3726-3727, NY US, G. M. Heiling et al, "Document Detector and Reader".
IBM Technical Disclosure Bulletin, vol. 17, No. 6, Nov. 1974, pp. 1821-1822, NY US, P. F. Heidrich et al, "Optical Waveguide Links for High-Resolutions Scanner Applications".

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