Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-10-06
1994-04-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250226, 356 71, G06K 500
Patent
active
053048130
ABSTRACT:
An apparatus for the optical recognition of documents (1) extends over the entire width of a transfer plane (3). Regularly disposed photoelectric elements (4), whose optical axes create a single sensor plane (5) that is perpendicular to transfer plane (3), receive light (7) as altered by document (1). Photoelectric elements (4) are regularly disposed in a manner in which their optical axes are contained in a sensor plane (5) perpendicular to transfer plane (3). A region (8) of document (1), determined by sensor plane (5), is illuminated by at least one light line (9 or 10) which is inclined with respect to sensor plane (5). The light modified by document (1) is received by photoelectric elements (4). The adjacent light sources in each light line (9,10) are separated by a uniform source distance (A), which is smaller than the sensor distance (B) between two adjacent photoelectric elements (4). The light sources emit light within a narrow spectral width in pulses of short duration. Each light source belongs to a color group of a set of color groups, with each source of the same color having the same spectral width. Photoelectric elements (4) convert modified light (7) into electrical sensor signals. An optical unit (21) determines a first acceptance angle (.alpha.) of photoelectric elements (4). Each of the photoelectric elements (4) has associated with it a second acceptance angle (.beta.) corresponding to a section (29). Each photoelectric element (4) serves to average the light belonging to each section (29).
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patent: 3480785 (1969-11-01), Aufderheide
patent: 4204765 (1980-05-01), Iannadrea et al.
patent: 4277774 (1981-07-01), Fujii et al.
patent: 4587434 (1986-05-01), Roes et al.
patent: 4618257 (1986-10-01), Bayne et al.
patent: 4922109 (1990-05-01), Bercovitz et al.
Allen S. B.
Landis & Gyr Betriebs AG
Nelms David C.
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