| 摘要 |
The present invention provides an image reader comprising an image reading line sensor for reading out data from an original document line by line to be converted into digital image data, a storage device capable of storing at least one line of read-out data, a sub-scanning device for controlling the image reading line sensor such that the line sensor accelerates up to a scanning speed which is equal to or higher than a record-scanning speed of an image data output device, a first controlling device for determining a first line and a last line to be read by the image reading line sensor in a sub-scanning direction, in relation to the sub-scanning speed of the image reading line sensor, and a second controlling device for controlling the storage device to sequentially store image data items which fall in an effective range on one line of image data read by the image reading line sensor, the storing of data being carried out during a fixed time period equal to or shorter than a minimum duration of a cycle in which one line is read out, and to sequentially release the stored image data items line by line in accordance with the record-scanning speed of the output device.
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