EP 0537431 B1 19970528 - Device for the optical recognition of documents
Title (en)
Device for the optical recognition of documents
Title (de)
Einrichtung zum optischen Erkennen von Dokumenten
Title (fr)
Dispositif pour la reconnaissance optique de documents
Publication
Application
Priority
CH 300591 A 19911014
Abstract (en)
[origin: EP0537431A1] A device for the optical recognition of documents (1) extends over the entire width of a transport plane (3). Regularly arranged photoelectric elements (4) whose optical axes determine a single sensor plane (5) aligned at right angles to the transport plane (3) of the document (1) receive light (7) altered by the document (1), a region (8), determined by the sensor plane (5), on the document (1) being illuminated by means of at least one luminous row (9; 10) inclined to the sensor plane (5). The adjacent light sources in each of the luminous rows (9; 10) are arranged at a regular source spacing (A) which is smaller than the sensor spacing (S) between two adjacent photoelectric elements (4). The light sources are set up to generate short light pulses, the light originating from a narrow spectral range. Each of the light sources belongs to one of a plurality of colour groups, the light sources of the same colour group having the same narrow spectral range. The photoelectric elements (4) convert the light (7) into electrical sensor signals. An optical means (21) determines the acceptance angle ( alpha ) of the photoelectric elements (4), which average the light (7) from mutually overlapping sections (29). <IMAGE>
IPC 1-7
IPC 8 full level
B41F 33/14 (2006.01); G01N 21/84 (2006.01); G06T 1/00 (2006.01); G07D 7/00 (2006.01); G07D 7/12 (2006.01); G07D 7/1205 (2016.01); G07D 7/121 (2016.01); G07D 7/20 (2006.01); H04N 1/40 (2006.01)
CPC (source: EP US)
G07D 7/1205 (2017.04 - EP US); G07D 7/121 (2013.01 - EP US); G07D 7/20 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0537431 A1 19930421; EP 0537431 B1 19970528; DE 59208542 D1 19970703; ES 2103330 T3 19970916; FI 924620 A0 19921013; FI 924620 A 19930415; HK 1007019 A1 19990326; JP 3152372 B2 20010403; JP H05282432 A 19931029; NO 923966 D0 19921013; NO 923966 L 19930415; US 5304813 A 19940419; US 5498879 A 19960312
DOCDB simple family (application)
EP 92113171 A 19920803; DE 59208542 T 19920803; ES 92113171 T 19920803; FI 924620 A 19921013; HK 98106215 A 19980623; JP 24842592 A 19920918; NO 923966 A 19921013; US 22992294 A 19940419; US 95722292 A 19921006