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US 2017/0019619 A1Published application
Photoelectric conversion device, image reading device, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTatsuya Suzuki, Masanori Ogura
Life of this patent
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Abstract
A photoelectric conversion device includes a current consumption circuit configured to consume current such that a difference between a current consumption during a blanking period and a current consumption during a standby period is reduced.
Claims18
A photoelectric conversion device comprising:
- a plurality of photoelectric conversion units configured to generate optical signals by performing photoelectric conversion of incident light;
- a plurality of column circuits configured to sequentially output signals based on the optical signals by being scanned;
- an output circuit configured to sequentially receive the signals based on the optical signals;
- and
- a current consumption circuit configured to consume current,
- wherein a sum of current consumptions per unit time of the plurality of column circuits in a first state in which the plurality of column circuits output the signals based on the optical signals is greater than a sum of current consumptions per unit time of the plurality of column circuits in a second state in which the plurality of column circuits do not output the signals based on the optical signals,
- wherein a current consumption per unit time of the output circuit in a third state in which the output circuit outputs the signals based on the optical signals is greater than a current consumption per unit time of the output circuit in a fourth state in which the output circuit does not output the signals based on the optical signals,
- wherein during a first period, the plurality of column circuits are in the first state, and the output circuit is in the fourth state,
- wherein during a second period, the plurality of column circuits are in the second state, and the output circuit is in the fourth state,
- wherein a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the first period is greater than a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the second period, and
- wherein the current consumption circuit consumes current such that a difference between the sum of current consumptions during the first period and the sum of current consumptions during the second period is reduced.
8 more elements
An image reading device that reads an image of an object, the image reading device comprising:
- a light emitting unit configured to apply light to the object;
- a photoelectric conversion device;
- and
- a shrinkage optical system configured to guide light which is reflected by the object to the photoelectric conversion device,
- wherein the photoelectric conversion device includes
- a plurality of photoelectric conversion units configured to generate optical signals by performing photoelectric conversion of incident light,
- a plurality of column circuits configured to sequentially output signals based on the optical signals by being scanned,
- an output circuit configured to sequentially receive the signals based on the optical signals, and
- a current consumption circuit configured to consume current,
- wherein a sum of current consumptions per unit time of the plurality of column circuits in a first state in which the plurality of column circuits output the signals based on the optical signals is greater than a sum of current consumptions per unit time of the plurality of column circuits in a second state in which the plurality of column circuits do not output the signals based on the optical signals,
- wherein a current consumption per unit time of the output circuit in a third state in which the output circuit outputs the signals based on the optical signals is greater than a current consumption per unit time of the output circuit in a fourth state in which the output circuit does not output the signals based on the optical signals,
- wherein during a first period, the plurality of column circuits are in the first state, and the output circuit is in the fourth state,
- wherein during a second period, the plurality of column circuits are in the second state, and the output circuit is in the fourth state,
- wherein a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the first period is greater than a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the second period, and
- wherein the current consumption circuit consumes current such that a difference between the sum of current consumptions during the first period and the sum of current consumptions during the second period is reduced.
12 more elements
An image forming apparatus comprising:
- an image reading device configured to read an image of an object;
- and
- an image forming unit configured to form an image using a signal output from the image reading device,
- wherein the image reading device includes a light emitting unit configured to apply light to the object,
- a photoelectric conversion device, and
- a shrinkage optical system configured to guide light which is reflected by the object to the photoelectric conversion device,
- wherein the photoelectric conversion device includes
- a plurality of photoelectric conversion units configured to generate optical signals by performing photoelectric conversion of incident light,
- a plurality of column circuits configured to sequentially output signals based on the optical signals by being scanned,
- an output circuit configured to sequentially receive the signals based on the optical signals, and
- a current consumption circuit configured to consume current,
- wherein a sum of current consumptions per unit time of the plurality of column circuits in a first state in which the plurality of column circuits output the signals based on the optical signals is greater than a sum of current consumptions per unit time of the plurality of column circuits in a second state in which the plurality of column circuits do not output the signals based on the optical signals,
- wherein a current consumption per unit time of the output circuit in a third state in which the output circuit outputs the signals based on the optical signals is greater than a current consumption per unit time of the output circuit in a fourth state in which the output circuit does not output the signals based on the optical signals,
- wherein during a first period, the plurality of column circuits are in the first state, and the output circuit is in the fourth state,
- wherein during a second period, the plurality of column circuits are in the second state, and the output circuit is in the fourth state,
- wherein a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the first period is greater than a sum of current consumptions per unit time of the plurality of column circuits and the output circuit during the second period, and
- wherein the current consumption circuit consumes current such that a difference between the sum of current consumptions during the first period and the sum of current consumptions during the second period is reduced.
14 more elements
Dependencies are inferred from the claim text.