G - Physics – 03 – B
Patent
G - Physics
03
B
88/94.5
G03B 27/34 (2006.01) G03B 27/40 (2006.01) G03G 15/04 (2006.01) H04N 1/028 (2006.01) H04N 1/04 (2006.01)
Patent
CA 1141210
Abstract The optical elements of a copier are automatically aligned by positioning the elements under the control of signals from an image-dissecting scanner. The scanner mounted to receive the image normally pre- sented to the photoconductor, examines a master document placed in the position normally occupied by a document to be copied. Optical adjustments are made as a function of the examination of lines on the master document by the scanner. The contrast between a line and its background is maximum when optical elements between the master document and the scanner provide the sharpest focus of the line image to the scanner. Signals from the scanner for a plurality of lines on the master document determine optimum posi- tioning of the optical elements. The scanner deter- mines the apparent spacing between lines which are a known distance apart on the master document to position the optical elements for a desired magnifi- cation. The positions of selected lines examined by the scanner, relative to absolute reference points are used to align the master document support for subsequent copying of original documents. B0978003
364621
Birdsall Ivan P.
Bradmon Paul J.
Buddington Donald L.
Garcia Vincent H.
Nelson Don S.
Barrett B.p.
International Business Machines Corporation
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