Back to results
US 6,963,430 B2Granted
Image reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorNoriaki Matsui
Life of this patent
Estimating the term…
Abstract
An image reading apparatus which enables a reduction of FCOT by omitting a home position search and a shading compensation after an input of a reading instruction for a succeeding original when reading different originals successively.
Claims6
An image reading apparatus comprising:
- a scanner unit which optically scans an original;
- a drive unit which moves said scanner unit;
- a mode setting unit which sets between a normal processing mode and a high-speed processing mode;
- and
- a controller,
- wherein when an operation of reading an image of the original has been completed,
- in said normal processing mode, said controller controls said drive unit to move said scanner unit to a home position, and thereafter sets an energized electric power of said drive unit at a minimum electric power, and keeps an energized state of said drive unit for a predetermined period of time, wherein when said controller is instructed to start a reading of an image of a succeeding original within the predetermined period of time, said controller performs a shading compensation for compensating an output of said scanner unit, and thereafter performs an operation of reading the image of the succeeding original, and
- in said high speed processing mode, said controller sets the energized electric power of said drive unit at the minimum electric power without moving said scanner unit to the home position, and keeps the energized state of said drive unit for the predetermined period of time, wherein when said controller is instructed to start the reading of the image of the succeeding original within the predetermined period of time, said controller performs the operation of reading the image of the succeeding original without performing the shading compensation.
5 more elements
A method of reading an image by using an image reading apparatus including a scanner unit which optically scans an original, a drive unit which moves said scanner unit, and a mode setting unit which sets between a normal processing mode and a high-speed processing mode, said method comprising:
- when an operation of reading an image of the original has been completed in said normal processing mode, controlling said drive unit to move said scanner unit to a home position, and thereafter setting an energized electric power of said drive unit at a minimum electric power, and keeping an energized state of said drive unit for a predetermined period of time, wherein when instructed to start a reading of an image of a succeeding original within the predetermined period of time, performing a shading compensation for compensating an output of said scanner unit, and thereafter performing an operation of reading the image of the succeeding original, and
- when the operation of reading the image of the original has been completed in said high-speed processing mode, setting the energized electric power of said drive unit at the minimum electric power without moving said scanner unit to the home position, and keeping the energized state of said drive unit for the predetermined period of time, wherein when instructed to start the reading of the image of the succeeding original within the predetermined period of time, performing the operation of reading the image of the succeeding original without performing the shading compensation.
Dependencies are inferred from the claim text.