Patent ID: 8614841
Filing Date: 2013-12-24
Classification: H04N

Abstract:
1. An image-reader comprising: a first counter that is configured to count a first count value based on a first clock; a second counter that is configured to count a second count value based on a second clock; a first reading unit that is configured to read a first surface of a document sheet based on the first count value; and a second reading unit that is configured to read a second surface of the document sheet based on the second count value, the second surface being opposite surface of the first surface, wherein when the first count value reaches a prescribed first value, both the first counter value and the second count value are reset, wherein the first counter includes: a first pixel period counter that is configured to count a first pixel period count value based on the first clock, the first pixel period count value being reset when the first pixel period count value reaches a prescribed first reference value indicating number of cycles of the first clock corresponding to one pixel of the first reading unit; and a first reading period counter that is configured to count a first reading period count value indicating number of resets of the first pixel period count value; wherein the second counter includes: a second pixel period counter that is configured to count a second pixel period count value based on the second clock, wherein the second pixel period count value is reset when the second pixel period count value reaches a prescribed second reference value indicating number of cycles of the second clock corresponding to one pixel of the second reading unit; and a second reading period counter that is configured to count a second reading period count value indicating number of resets of the second pixel period count value, wherein when the first reading period count value reaches a prescribed first line pixel value corresponding to number of pixels in one line of the first reading unit, both the first pixel reading period count value and the second pixel reading period count value are reset.