IMAGING DEVICE

PROBLEM TO BE SOLVED: To provide an imaging device easily acquiring a fine image by reducing distortion in images obtained by imaging disk-like objects whose radius are variously different, and reducing cost. SOLUTION: The imaging device 20 having a sensor 1 for imaging at least a line area 1a, for imaging a circular flat face of the disk-like object 4 having an optically identifiable pattern on the circular flat face by the sensor 1 has: two supports 2 each having a support face 2a; and a circular rotator 3 moving so as to press the circumferential face of the disk-like object 4, and rotating so as to rotate the disk-like object 4. The two support faces 2a are disposed symmetrically with respect to the line area 1a as an axis. The two support faces 2a and the rotator 3 hold the disk-like object 4 to be imaged. The disk-like object 4 is imaged for a predetermined time while the rotator 3 rotates the disk-like object 4, so that the imaging device 20 easily acquires the fine image with less distortion, and reduces the cost. COPYRIGHT: (C)2010,JPO&INPIT