Image reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasafumi Kamei
Life of this patent
Estimating the term…
Abstract
When an original conveying unit that rotates about a rotation center 901 reaches an opening angle 906, an image is read using a line sensor, and a detected object is determined as being white dust on a platen glass. When it further reaches an opening angle 908, an image is again read using the line sensor, and a detected object is determined as being black dust on the platen glass. When it further reaches an opening angle 910, an image is again read using the line sensor, and a detected object is determined as being dust on a reference white plate with which the original conveying unit is provided in a state of facing a reading position where the line sensor performs reading.
Claims5
An image reading apparatus that reads an original that is conveyed on a platen glass using an optical unit including a line sensor and an imaging optical system, the image reading apparatus comprising:
- an opening/closing member that can be opened and closed about a rotation axis that is orthogonal to a lengthwise direction of the line sensor;
- a white member provided on the opening/closing member, the white member facing the optical unit;
- and
- a detecting unit that detects images of a foreign substance from a plurality of images obtained by the optical unit reading the white member, the plurality of images being obtained respectively in a plurality of states where the opening/closing member is opened at a plurality of opening angles,
- wherein the detecting unit detects the foreign substance as a foreign substance adhering to the platen glass in a case where the images of the foreign substance detected from the plurality of images are at the same position.
An image reading apparatus that reads an original that is conveyed on a platen glass using an optical unit including a line sensor and an imaging optical system, the image reading apparatus comprising:
- an opening/closing member that can be opened and closed about a rotation axis that is orthogonal to a lengthwise direction of the line sensor;
- a white member provided on the opening/closing member, the white member facing the optical unit;
- and
- a detecting unit that detects images of a foreign substance from a plurality of images obtained by the optical unit reading the white member, the plurality of images being obtained respectively in a plurality of states where the opening/closing member is opened at a plurality of opening angles,
- wherein the detecting unit detects the foreign substance as a foreign substance adhering to the white member in a case where the images of the foreign substance detected from the plurality of images are at different positions.
Dependencies are inferred from the claim text.