Image reading apparatus and method with reduced wake-up time after sleep mode
First Claim
1. An image reading apparatus comprising:
- an image sensor configured to convert image light of a document into an image signal;
an optical unit configured to project the image light of the document on the image sensor;
a drive unit configured to drive the optical unit in a sub scanning direction;
a document size detecting unit configured to detect a size of the document using the image signal;
an image signal processing unit configured to digitally convert the image signal of the image sensor into image data;
a power circuit configured to output an operating voltage in standby mode and stop the outputting of the operating voltage in sleep mode; and
a power saving control unit configured to move the optical unit to a document size detecting position, different from a home position and a reference white plate reading position, by operating the drive unit before switching the power circuit from the standby mode to the sleep mode,wherein, after the power circuit is switched from the sleep mode to the standby mode by the power saving control unit, the document size detecting unit detects the size of the document.
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Accused Products
Abstract
An image reading apparatus is provided that includes an image sensor configured to convert image light of a document into an image signal, an optical unit configured to project the image light of the document on the image sensor, a drive unit configured to drive the optical unit in a sub scanning direction, a document size detecting unit configured to detect a size of the document using the image signal, an image signal processing unit configured to digitally convert the image signal of the image sensor into image data, a power circuit configured to output an operating voltage in standby mode and stop the outputting of the operating voltage in sleep mode, and a power saving control unit configured to position the optical unit to a document size detecting position before switching the power circuit from the standby mode to the sleep mode.
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Citations
20 Claims
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1. An image reading apparatus comprising:
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an image sensor configured to convert image light of a document into an image signal; an optical unit configured to project the image light of the document on the image sensor; a drive unit configured to drive the optical unit in a sub scanning direction; a document size detecting unit configured to detect a size of the document using the image signal; an image signal processing unit configured to digitally convert the image signal of the image sensor into image data; a power circuit configured to output an operating voltage in standby mode and stop the outputting of the operating voltage in sleep mode; and a power saving control unit configured to move the optical unit to a document size detecting position, different from a home position and a reference white plate reading position, by operating the drive unit before switching the power circuit from the standby mode to the sleep mode, wherein, after the power circuit is switched from the sleep mode to the standby mode by the power saving control unit, the document size detecting unit detects the size of the document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image reading apparatus comprising:
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an image sensor configured to convert image light of a document into an image signal; an optical unit configured to project the image light of the document on the image sensor; a drive unit configured to drive the optical unit in a sub scanning direction; a document size detecting unit configured to detect a size of the document using the image signal; an image signal processing unit configured to digitally convert the image signal of the image sensor into image data; a power circuit configured to output an operating voltage in standby mode and stop the outputting of the operating voltage in sleep mode; a power saving control unit configured to position the optical unit to a document size detecting position before switching the power circuit from the standby mode to the sleep mode; a translucent plate configured to support the document; a holding member configured to hold down the document placed on the translucent plate; an open/closed state detecting unit configured to detect an open/closed state of the holding member with respect to the translucent plate; a reference point sensor arranged at a predetermined position with respect to the sub scanning direction and configured to detect the optical unit; and a document feeding unit including a document tray configured to accommodate the document, a sheet-through reading conveying unit configured to convey the document placed in the document tray in a direction traversing a sheet-through reading range of the optical unit in the sub scanning direction which sheet-through reading range is realized when the optical unit is positioned at a sheet-through reading position, and a document sensor configured to detect the document placed in the document tray; wherein the power saving unit includes a signal generating unit configured to generate a signal indicating whether the outputting of the operating voltage by the power circuit is caused by an external power source being connected to the power circuit or a switching of the power circuit from the sleep mode to the standby mode; and in a case where the signal indicates that the outputting of the operating voltage by the power circuit is caused by the switching of the power circuit from the sleep mode to the standby mode, the drive unit drives the optical unit towards a sub scanning drive start position when the open/closed state detecting unit detects that the holding member is in a closed state and the document sensor detects that the document is placed in the document tray, and initializes sub scanning position information of the optical unit to information representing the predetermined position of the reference point sensor with respect to the sub scanning direction when the reference point sensor detects that the optical unit has reached said predetermined position. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An imaging apparatus, comprising:
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an image reading apparatus configured to generate read image data; an image data processing unit configured to convert the read image data generated by the image reading apparatus into printer image data; a printer configured to print an image represented by the printer image on a recording medium; an input unit configured to input a document reading command for the image reading apparatus and a printing command for the printer; and a control unit configured to control document reading executed by the image reading apparatus and printing executed by the printer in response to the document reading command and the printing command; wherein the image reading apparatus includes an image sensor configured to convert image light of a document into an image signal; an optical unit configured to project the image light of the document on the image sensor; a drive unit configured to drive the optical unit in a sub scanning direction; a document size detecting unit configured to detect a size of the document using the image signal; an image signal processing unit configured to digitally convert the image signal of the image sensor into the read image data; a power circuit configured to output an operating voltage in standby mode and stop the outputting of the operating voltage in sleep mode; and a power saving control unit configured to move the optical unit to a document size detecting position, different from a home position and a reference white plate reading position, by operating the drive unit before switching the power circuit from the standby mode to the sleep mode, wherein, after the power circuit is switched from the sleep mode to the standby mode by the power saving control unit, the document size detecting unit detects the size of the document. - View Dependent Claims (17, 18, 19, 20)
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Specification