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METHOD TO ELIMINATE SIDE EDGE BLACK BORDERS ON COPIERS USING SELFOC LENS

IP.com Disclosure Number: IPCOM000024622D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

The Figure shows a SELFOC lens array 2 which transmits an image of a document 4 lying on a platen 6 to a photosensitive imaging plane 8. The document edge 10 would normally be imaged at imaging point 10' leaving an unexposed area adjacent the edge point resulting in the well-known phenomenon of black borders on subsequently-made copies. In copiers with conventional lenses, the problem is usually solved by setting the lens at a slight magnification to move the edge border outside the edges of the imaged area and hence outside the edges of the copy paper. This is not possible with a SELFOC lens which has a 1 .OX magnification. The same effect is achieved, however, by forming the ends 12, 14 of the array as shown. The end portions thus act as a prism "bending" the optical axis so that the document edge will be imaged at point 10" outside the imaging area. The border area of a document, which is usually white, will completely discharge the copy edge area and the magnification remains 1X for all except the extreme edges.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U.S. CI. 350/96.1

Int. CI. G02b 5/14

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The Figure shows a SELFOC lens array 2 which transmits an image of a document 4 lying on a platen 6 to a photosensitive imaging plane 8. The document edge 10 would normally be imaged at imaging point 10' leaving an unexposed area adjacent the edge point resulting in the well-known phenomenon of black borders on subsequently-made copies. In copiers with conventional lenses, the problem is usually solved by setting the lens at a slight magnification to move the edge border outside the edges of the imaged area and hence outside the edges of the copy paper. This is not possible with a SELFOC lens which has a 1 .OX magnification. The same effect is achieved, however, by forming the ends 12, 14 of the array as shown. The end portions thus act as a prism "bending" the optical axis so that the document edge will be imaged at point 10" outside the imaging area. The border area of a document, which is usually white, will completely discharge the copy edge area and the magnification remains 1X for all except the extreme edges.

Volume 6 Number 3 May/June 1981 123

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124 XEROX DISCLOSURE JOURNAL

Volume 6 Number 3 May/June 1981

[This page contains 1 picture or other non-text object]