Image scanning apparatus and method of determining size of original document
AssigneeMurata Machinery, Ltd.
InventorNoriyoshi Takeshima
Life of this patent
Estimating the term…
Abstract
An image scanning apparatus arranged to press an original document placed on a glass plate by a platen cover and to scan the original document by a line sensor includes a light source used when scanning image information, a first detection sensor arranged to detect as a first timing a state in which the cover is opened at, for example, an angle of 20 degrees, a second detection sensor arranged to detect as a second timing a state, for example, that is immediately before the cover closes the glass plate, and an original document size determining unit arranged to determine the size of the original document based on the differential data, which is calculated from first image information scanned at the first timing and second image information scanned at the second timing.
Claims16
An image scanning apparatus comprising:
- an original document platen on which an original document can be placed;
- an original document pressing member arranged to press and position the original document placed on the original document platen;
- an image scanning sensor arranged to scan image information of the original document;
- a light source arranged to be used when scanning the image information;
- a detection unit arranged to detect a first timing that is set in a process of closing the original document pressing member and to detect a second timing that is set in the process of closing the original document pressing member and that is different from the first timing;
- a control unit arranged to light the light source at least two timings corresponding to the first timing and the second timing when the original document pressing member is being closed, and to scan the image information by the image scanning sensor;
- a difference calculating unit arranged to calculate differential data between first image information scanned at the first timing and second image information scanned at the second timing;
- and
- an original document size determining unit arranged to determine a size of the original document based on the differential data.
A method of determining a size of an original document comprising the steps of:
- lighting a light source at least two timings corresponding to a first timing and a second timing, when closing an original document pressing member;
- scanning image information of an original document by an image scanning sensor;
- calculating differential data between first image information scanned at the first timing and second image information scanned at the second timing;
- and
- determining a size of the original document based on the differential data.
Dependencies are inferred from the claim text.