Patent ID: 8801130

Claim:
An image position inspecting apparatus, comprising: a reading unit that includes light receiving elements arranged in a main scanning direction crossing a conveying direction of a recording media and that reads an inspection image formed on the recording media one pixel by one pixel at intervals of the same number of pixels along the main scanning direction; a computer that generates a profile along a main scanning direction of the inspection image based on the inspection image read by the image reading unit; and a computer that acquires a position of the center of gravity of the pixels of the inspection image with respect to the light receiving elements from the profile and that specifies a position of each of the pixels of the inspection image in the main scanning direction based on a phase difference, the phase difference being a deviation of the acquired position of the center of gravity of the pixels in the inspection image with respect to a light receiving center of the light receiving elements, wherein, when a reading resolution of the image reading unit along the main scanning direction is Rs and a resolution of the inspection image along the main scanning direction is Rp, the reading resolution of the image reading unit and the resolution of the inspection image satisfy the following equation: Rp ·(( m+ 1)/2)< Rs<Rp ·(( m+ 2)/2), m is a positive integer.