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US 8,798,489 B2Granted
Recording-medium imaging device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTsutomu Ishida, Shunichi Ebihara, Norio Matsui, Shoichi Koyama
Life of this patent
Estimating the term…
Abstract
An effective image area can be properly corrected in accordance with the quantity of light from an irradiation unit by selecting, as the effective image area, pixels having light quantities more than or equal to a threshold value that allows accurate acquisition of a surface image of a recording medium, on the basis of a light quantity distribution of the light from the irradiation unit. This reduces the influence of mounting accuracy of the irradiation unit, and allows the recording medium to be identified accurately.
Claims37
A recording-medium detecting device comprising:
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light, and wherein a part of the reference plate is provided between both ends of the recording medium onto which the emission unit emits the light in a direction perpendicular to a conveying direction of the recording medium,
- wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate.
3 more elements
The recording-medium detecting device comprising:
- an emission unit configured to emit light onto a recording medium;
- a receiving unit configured to receive reflected light from the recording medium to obtain an image of the recording medium;
- a storage unit configured to store a plurality of correction data for correcting data on the image of the recording medium;
- and
- a reference plate used to select the correction data stored in the storage unit according to a light quantity of the reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light.
2 more elements
An image forming apparatus comprising:
- an image forming unit configured to form an image;
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light, wherein a part of the reference plate is provided between both ends of the recording medium onto which the emission unit emits the light in a direction perpendicular to a conveying direction of the recording medium,
- wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate, and an image forming condition of the image forming unit is controlled on the basis of the reflected light from the recording medium.
4 more elements
An image forming apparatus comprising:
- an image forming unit configured to form an image;
- an emission unit configured to emit light onto a recording medium;
- a receiving unit configured to receive reflected light from the recording medium to obtain an image of the recording medium;
- a storage unit configured to store a plurality of correction data for correcting data on the image of the recording medium;
- and
- a reference plate used to select the correction data stored in the storage unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light,
- wherein an image forming condition of the image forming unit is controlled on the basis of the data on the image of the recording medium corrected according to the selected correction data.
4 more elements
A recording-medium identification apparatus comprising:
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion;
- and
- a control unit configured to identify a type of the recording medium based on the reflected light from the recording medium,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of the reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light.
3 more elements
A recording-medium detecting device comprising:
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light, and wherein the reference plate is provided between both ends of the recording medium onto which the emission unit emits the light in a direction perpendicular to a conveying direction of the recording medium,
- wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate.
3 more elements
An image forming apparatus comprising:
- an image forming unit configured to form an image;
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive light reflected from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of the reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light, wherein the reference plate is provided between both ends of the recording medium onto which the emission unit emits the light in a direction perpendicular to a conveying direction of the recording medium,
- wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate, and an image forming condition of the image forming unit is controlled on the basis of the reflected light from the recording medium.
4 more elements
An image forming apparatus comprising:
- an image forming unit configured to form an image;
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion, wherein, after the receiving unit receives the reflected light from the recording medium at the first receiving portion, an image is formed on the recording medium,
- wherein the reference plate is used to adjust a light quantity from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light,
- wherein an image forming condition of the image forming unit is controlled on the basis of the reflected light from the recording medium.
4 more elements
A recording-medium detecting device comprising:
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- and
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion, wherein, after the receiving unit receives the reflected light from the recording medium at the first receiving portion, an image is formed on the recording medium,
- wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light.
2 more elements
A recording-medium identification apparatus comprising:
- a reference plate configured to reflect light;
- an emission unit configured to emit light onto a recording medium and the reference plate;
- a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference place at a second receiving portion;
- and
- a control unit configured to identify a type of the recording medium based on data on the image of the recording medium,
- wherein the reference plate is used to adjust a light quantity from the emission unit according to a light quantity of the reflected light from the reference plate,
- wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate.
4 more elements
Dependencies are inferred from the claim text.