Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1998-03-13
2000-06-27
Lee, Cheukfan
Facsimile and static presentation processing
Facsimile
Picture signal generator
358487, 358496, H04N 104
Patent
active
060813520
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an image scanner, and more particularly, to the handling of a sheet formed original before and during scanning in an image scanner.
BACKGROUND OF THE INVENTION
Two different classes of image scanners are known in the art. Flatbed scanners and drum scanners.
In a flatbed scanner, the original to be scanned has to be held extremely flat in order for all areas of an image on the original to be positioned in focus of the optics of the image scanner during recording of that area. For this purpose, the original is typically placed in a holder comprising two holder parts with glass plates. The original may be clamped between the two glass plates.
It is a disadvantage of known holders for flatbed scanners that the manual attachment of the original in the holder does not assure complete contact between the original and the glass plates so that Newton rings may be created by the partial separation between these surfaces.
It is a another disadvantage that the holder requires regular and careful cleaning to avoid dust and dirt to accumulate on the glass surfaces. Dirty surfaces impair the quality of scanned images and may scratch originals.
It is yet another disadvantage that the holder requires careful handling to keep the glass plates free of scratches.
It is still another disadvantage that the accurate positioning of the original in the holder require skills of the operator and is tedious and time consuming.
It is a further disadvantage that the holder can not apply sufficient strong forces to the original to stretch it to the required planar form. Typically, the original forms concave and convex buckles between the glass plates of the holder.
In a drum scanner, the original to be scanned is mounted on a transparent image reading drum. The original is manually attached and fixed onto the cylindrical surface of the image reading drum with adhesive tape, and is detached from the drum by peeling the adhesive tape off the original.
It is a disadvantage of the drum scanner that the attachment of the original to the drum does not assure complete contact of the original with the image reading drum, and in many cases, its poor contact with or partial separation from the drum causes Newton's rings.
It is another disadvantage of the drum scanner that because of the high rotational speed of the drum, the original has to be firmly attached to the drum to withstand high centrifugal forces. The firm mounting of the original requires skill and is time consuming.
SUMMARY OF THE INVENTION
The general object of the invention is to provide an improved user friendly method of feeding an original into an image scanner, an image scanner utilizing such a method, and a holder for holding an original before and during scanning in an image scanner utilizing such a method.
The terms sheet formed original and original refer to any flat object suitable for scanning, such as paper printed with signs, such as letters, drawings, graphical symbols, etc, photographs, transparencies, etc.
It is a further object of the present invention to provide an image scanning method and apparatus wherein the original need not be mounted between sheets or plates of transparent materials, such as glass.
It is a still further object of the present invention to provide an image scanning method and apparatus wherein the original need not be mounted with adhesive tape.
According to the invention these and other objects are fulfilled by a method of scanning a sheet formed original in an image scanner including supporting means for supporting a sheet formed original, imaging means, such as optics, such as a lense, etc, and light detecting means, such as a CCD, etc, said method comprising imparting a substantially cylindrical shape, such as a circular cylindrical shape, etc, to at least part of the original to be supported by the supporting means, moving the imaging means and the supporting means in relation to each other in a direction substantially parallel to the generatrix of the cylindrical surface.
Fur
REFERENCES:
patent: 3640482 (1972-02-01), Von Hippel
patent: 4440491 (1984-04-01), Takahama
patent: 4712009 (1987-12-01), Ohgoda et al.
patent: 4963997 (1990-10-01), VanScooter
patent: 5088813 (1992-02-01), Wakefield
patent: 5208680 (1993-05-01), Sugimoto et al.
patent: 5422737 (1995-06-01), Atoji et al.
patent: 5574578 (1996-11-01), Dresch et al.
patent: 5583663 (1996-12-01), Boeve
Heger Anders
Poulsen Christian
Imacon ApS
Lee Cheukfan
LandOfFree
Image scanner utilizing rollers to bias an original in a holder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image scanner utilizing rollers to bias an original in a holder , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image scanner utilizing rollers to bias an original in a holder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1789029