G - Physics – 03 – B
Patent
G - Physics
03
B
314/42
G03B 27/32 (2006.01) G03B 27/52 (2006.01) H04N 1/03 (2006.01) H04N 1/04 (2006.01) H04N 1/10 (2006.01)
Patent
CA 1165381
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 magnifica- tion. 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. Digitized light-level value samples from the scanner are pushed into a last-in/first-out stack. A value significantly less than the average of the values in the stack indicates that the scanner has found a line. A plurality of scans of the line are then made while adjusting the optical elements. Corresponding light values are pushed into the stack and the average of the values stored in the stack is calculated. If the average is greater than previously calculated averages, a number of additional scans are made to insure that the best focus adjustment has been identified. BO979040
363927
Barrett B.p.
International Business Machines Corporation
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