Patent ID: 6633415
Filing Date: 2003-10-14
Classification: H04N

Abstract:
An image input apparatus comprising:an image sensor arranged to read an original image to convert the original image into an electrical signal; a moving device that moves the original image and said image sensor relative to each other, said moving device including a plurality of gears, and the characteristic of said moving device includes backlash of said plurality of gears; a control device that, when said moving device moves one and the same portion of the original image and said image sensor relative to each other a plural number of times, controls the plural-number-th-time movement according to a characteristic of said moving device; a driving pulse supply device that supplies a driving pulse signal for driving said moving device, wherein said control device controls the number of pulses of the driving pulse signal to be supplied to said moving device; and a synchronizing signal supply device that supplies a synchronizing signal serving as reference for image reading by said image sensor, wherein, prior to starting of image reading for the plural-number-th time, said control device causes said driving pulse supply device to supply to said moving device a driving pulse signal of a number of pulses obtained by adding together (i) the number of pulses of the driving pulse signal supplied to said moving device from said driving pulse supply device during a period for which movement by said moving device is effected from a first-time reading start position to a first-time reading end position, (ii) the number of pulses of the driving pulse signal corresponding to the backlash, and (iii) the number of pulses of the driving pulse signal supplied to said moving device from said driving pulse supply device during a period from a point of time when the synchronizing signal is outputted immediately before movement by said moving device reaches the first-time reading start position to a point of time when movement by said moving device reaches the first-time reading start position.