Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-11-22
1995-04-25
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
358487, H04N 104
Patent
active
054101441
ABSTRACT:
A dental film-based radiograph which is relatively small of the order of 40 mm by 30 mm is scanned and converted to a digital image by mounting the radiograph on a table movable in a single direction at a transparent aperture of the table and by transmitting through the radiograph a beam of laser light from a line source with the line parallel to the radiograph and defining a collimated beam of parallel light at right angles to the line and lying in a single plane containing the line. A detector in the form of a linear array of CCD detector elements is arranged in the plane to receive the light passing through the radiograph. The whole is contained in an enclosure to exclude ambient light. The scanning movement can be effected step by step or continuously with the laser source pulsed.
REFERENCES:
patent: 3629495 (1971-12-01), Cahill
patent: 5093738 (1992-03-01), Gerlach
patent: 5241406 (1993-08-01), Johnston et al.
Lavelle Christopher L. B.
Wu Chuang-Jy
Ade Stanley G.
Allen Stephone B.
Battison Adrian D.
DACIM Laboratory Inc.
Thrift Murray E.
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