Patent ID: 8693067
Filing Date: 2014-04-08
Classification: H04N

Abstract:
1. An image reading device comprising: a first reading unit configured to read one surface of an original sheet, the first reading unit including a first reading region having a first width, the first reading region being divided into N-number of first sub-regions each of which reads a respective portion of the one surface, the N-number of first sub-regions acquiring N-number of sets of analog signal respectively, the original sheet having the one surface and another surface; a second reading unit configured to read the another surface, the second reading unit including a second reading region having a second width shorter than the first width, the second reading region being divided into M-number of second sub-regions each of which reads a respective portion of the another surface, the M-number of second sub-regions acquiring M-number of sets of analog signal respectively, M being an integer smaller than N; a control device configured to set one of a single-sided read mode and a double-sided read mode, wherein, in the single-sided read mode, the first reading unit reads the one surface and the second reading unit fails to read the another surface, and, in the double-sided read mode, the first reading unit reads the one surface and the second reading unit reads the another surface; a first converting unit including L-number of first channels each of which is configured to convert a set of analog signal into a set of digital signal, L being an integer greater than or equal to M and smaller than or equal to N, N being smaller than or equal to 2×L, the L-number of first channels being connected to L-number of first sub-regions, the N-number of first sub-regions of the first reading unit including the L-number of first sub-regions; a second converting unit including L-number of second channels each of which is configured to convert a set of analog signal into a set of digital signal; and a selector device configured to selectively connect the second converting unit to one of: the M-number of second sub-regions of the second reading unit; and (N-L) number of first sub-regions other than the L-number of first sub-regions, the N-number of first sub-regions of the first reading unit including the (N-L)-number of first sub-regions other than the N-number of first sub-regions; and wherein when the control device sets the double-sided read mode, the control device controls the selector device to connect the M number of second sub-regions of the second reading unit to M-number of second channels, the L-number of second channels of the second converting unit including the M-number of second channels, the (N-L)-number of first sub-regions fail to be connected to any converting units; the first converting unit converts L-number of analog signal sets acquired by the first reading unit into L-number of digital signal sets as first image data corresponding to the one surface of the original sheet, the second converting unit converts L-number of analog signal sets acquired by the second reading unit into L-number of digital signal sets as second image data corresponding to the another surface of the original sheet, wherein when the control device sets the single-sided read mode, the control device controls the selector device to connect the (N-L)-number of first sub-regions of the first reading unit to (N-L)-number of second channels, the L-number of second channels including the (N-L)-number of second channels, the first converting unit converts L-number of analog signal sets acquired by the first reading unit into L-number of digital signal sets, the second converting unit converts (N-L)-number of analog signal sets acquired by the first reading unit into (N-L)-number of digital signal sets, the L-number of digital signal sets acquired by the first converting unit and the (N-L)-number of digital signal sets acquired by the second converting unit constitute the first image data.