Image reading apparatus and printing apparatus
First Claim
Patent Images
1. An image reading apparatus, comprising:
- a reading unit configured to read an image of an original;
an image processing circuit to which image data read by the reading unit, a vertical synchronization signal, and a horizontal synchronization signal area are inputted, and configured to perform image processing for the image data; and
a memory which is capable of operating in a first power mode and a second power mode in which power consumption is lower than power consumption in the first power mode, and configured to hold the image data that is image processed by the image processing circuit;
wherein the memory counts a number of the horizontal synchronization signals which are inputted to the image processing circuit from the reading unit after the vertical synchronization signal is inputted to the image processing circuit from the reading unit, and executes a transition process from the second power mode to the first power mode upon the counted number reaching a predetermined number.
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Abstract
An image reading apparatus, comprising a memory that can transition from a normal mode to a power saving mode based on an inputted control signal, and a control unit that controls the control signal based on a synchronization signal that indicates a timing at which an image processing module outputs image data to a reading unit or a print unit.
32 Citations
16 Claims
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1. An image reading apparatus, comprising:
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a reading unit configured to read an image of an original; an image processing circuit to which image data read by the reading unit, a vertical synchronization signal, and a horizontal synchronization signal area are inputted, and configured to perform image processing for the image data; and a memory which is capable of operating in a first power mode and a second power mode in which power consumption is lower than power consumption in the first power mode, and configured to hold the image data that is image processed by the image processing circuit; wherein the memory counts a number of the horizontal synchronization signals which are inputted to the image processing circuit from the reading unit after the vertical synchronization signal is inputted to the image processing circuit from the reading unit, and executes a transition process from the second power mode to the first power mode upon the counted number reaching a predetermined number. - View Dependent Claims (2, 3, 4)
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5. A printing apparatus, comprising:
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an image processing circuit that receives image data, a vertical synchronization signal, and a horizontal synchronization signal and performs image processing for inputted image data; a memory which is capable of operating in a first power mode and a second power mode in which power consumption is lower than power consumption in the first power mode, and configured to hold the image data that is image processed by the image processing circuit; and a print unit configured to perform printing based on the image data held in the memory, wherein the member counts a number of the horizontal synchronization signals which are inputted to the image processing circuit from the printing unit after the vertical synchronization signal is inputted to the image processing circuit from the print unit and executes a transition process from the second power mode to the first power mode upon the counted number reaching a predetermined number. - View Dependent Claims (6, 7, 8)
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9. An image reading apparatus, comprising:
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a reading unit configured to read, line by line, an original of one page; a volatile memory which is capable of operating in a first power state and in a second power state in which power consumption is lower than power consumption in the first power state, the first power state being capable of holding data and reading out the data, and the second power state being capable of holding data and being not capable of reading out the data; an image processing circuit configured to process image data obtained by reading the original by the reading unit, accessing the data held in the memory; and a memory controller configured to control a power state of the memory, wherein the memory controller shifts the power state of the memory from the first power state to the second power state after inputting of the image data of the last line of the one page to the image processing circuit is completed. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification