Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A scanner for scanning an image on a document along a plurality of scan lines to produce electrical scan signals related to the image, including means (12) defining a document backing surface (14) against which said document (10) is placed for scanning of said image, scanner means (24, 26, 28) for providing scan signals in dependence upon the image at a plurality of moving scan positions (44), said positions being moved across said image and said document backing surface along associated ones of said scan lines, characteriz- ed by means (42, 58) defining a recognizable background image on said document backing surface, whereby said scanner means provides scan signals of recognizable pattern as said document backing surface is scanned.
Claim 2
Dependent Claim
119 words
A scanner for scanning an image on a document along a plurality of scan lines to produce electrical scan signals related to the image, including means (12) defining a document backing surface (14) against which said document (10) is placed for scanning of said image, scanner means (24, 26, 28) for providing scan signals in dependence upon the image at a plurality of moving scan positions (44), said positions being moved across said image and said document backing surface along associated ones of said scan lines, characteriz- ed by means (42, 58) defining a recognizable background image on said document backing surface, whereby said scanner means provides scan signals of recognizable pattern as said document backing surface is scanned.
Claim 3
Dependent Claim
29 words
l A scanner as claimed in claim 1 in which said means defining a recognizable background image defines a plurality of stripes (42, 58) on said document backing surface.
Claim 4
Dependent Claim
28 words
A scanner as claimed in claim 2 in which said stripes (58) on said document backing surface extend parallel to the direction of movement of said. scan posi.tions.
Claim 5
Dependent Claim
28 words
A scanner as claimed in claim 2 in which said stripes on said document backing surface extend substantially perpendicular to the direction of movement of said scan positions.
Claim 6
Dependent Claim
21 words
A scanner as claimed in claim 2, 3 or 4 in which alternate stripes are black and intermediate stripes are white.
Claim 7
Dependent Claim
37 words
A scanner as claimed in any preceding claim comprising circuit means (Figs. 6, 7), responsive to said scan signals, for detecting said recognizable pattern of said scan signals, which pattern indicates scanning of said document backing surface.