Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1995-05-26
1997-02-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055944, 382255, 382295, 382312, 356381, 358406, 358475, G06K 7015, G06K 900
Patent
active
056061730
ABSTRACT:
A set of track gauges for use in aligning, focusing and normalizing an imaging system of a high speed document processor have been provided. Each of the gauges fit within a track (14) in front of the imaging system (10 or 12). The depth gauge (70) is used to align the secondary light beam (26) with the primary light beam (22) so that all documents passing through the track (14) will be evenly illuminated from two points symmetrically offset from a line normal to the track (14). In addition, the depth gauge (70) is used to align a normally reflected beam (32) with a photodetector array (56). Two different trunnion mirrors (54 and 28) are adjusted in the two different alignment operations. The focusing gauge (80) includes a set of black 87 and white 88 stripes positioned on a middle region 86. The white reference gauge (90) has a reflective white coating in its middle region 96. An oscilloscope (100, 210, 300, or 400) is used to display the intensity of reflected light (32) impinging on the photodetector array (56) during all optical alignment and focusing operations.
REFERENCES:
patent: 5068912 (1991-11-01), Concannon et al.
patent: 5420944 (1995-05-01), Concannon et al.
patent: 5420945 (1995-05-01), Concannon et al.
Catchpole Clive E.
Concannon David J.
Copenhaver Gary B.
Lee John R.
McCormack John J.
Starr Mark T.
Unisys Corporation
Westin Edward P.
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