초록 ▼

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 presented to the photoconductor, examines a master document placed in the position normally occupie

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 presented 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 positioning of the optical elements. The scanner determines the apparent spacing between lines, which are a known distance apart on the master document, to position the optical elements for a desired magnification. 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.

대표청구항 ▼

Apparatus for optimumly adjusting the optical elements of a copier to positions forming images of lines, on an illuminated target background, which have the greatest background-to-line illumination contrast, where the invention comprises: an electronic scanner, operable to repeatedly examine the sam

Apparatus for optimumly adjusting the optical elements of a copier to positions forming images of lines, on an illuminated target background, which have the greatest background-to-line illumination contrast, where the invention comprises: an electronic scanner, operable to repeatedly examine the same target line images and generate, for each line, signals manifesting the amount of light reflected by that line relative to the target background; and driving devices, for positioning the copier optical elements during repeated operation of the scanner.