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US 4,709,147 AGranted
Image reading apparatus which calculates an original reading domain
AssigneeCanon Kabushiki Kaisha
InventorHitoshi Arai
Life of this patent
Estimating the term…
Abstract
An image reading apparatus has a CCD, a reference point on a reference plate, an image signal reading circuit, an image signal control circuit, and a CPU. When an optical element is shifted from its normal position, such a positional error can be automatically corrected without requiring readjustment of the optical element.
Claims8
An image reading apparatus comprising:
- means for reading an image of an original by scanning the original;
- an indication member for indicating a reading reference position of said reading means along a main scanning direction;
- means for detecting the reading reference position by reading said indication member with said reading means;
- means for calculating an original reading domain of said reading means in accordance with a detection output from said detecting means and a size of an original to be read;
- control means for controlling an output from said reading means when reading the image of the original, in accordance with a calculation result of said calculating means;
- and
- means for displaying an indication of an occurrence of a situation in which the original reading domain calculated by said calculating means cannot be read by said reading means.
4 more elements
An image reading apparatus comprising:
- means for reading an image of an original by scanning the original;
- an indication member for indicating a reading reference position of said reading means along a main scanning direction;
- means for detecting the reading reference position by reading of said indication member by said reading means;
- means for calculating an original reading domain in accordane with a detection output from said detecting means and a size of an original to be read;
- and
- discriminating means for discriminating as to whether or not the original can be read by said reading means, in accordance wiht a calculation result of said calculating means,
- wherein said discriminating means prohibits original reading when it is determined that the original cannot be read by said reading means.
4 more elements
Dependencies are inferred from the claim text.