DISK, ENCODER, AND IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an image forming device provided with an encoder having a disk provided with a configuration capable of facilitating removal work of a member and preventing occurrence of improper image by preventing occurrence of dirt when removing the disk and suppressing reduction of detection precision using the disk. SOLUTION: This image forming device is provided with the disk 148 mounted on a rotary shaft 141A and rotated and driven. This device is provided with the configuration 151 in which marking M is applied to a face in the vicinity of the outer periphery of the disk 148 by equal pitch and a grip part 148A or 148B constituted by a hole 148A1 or a projecting part 148B1 which opposes across the center of the disk 148 is provided at a position close to the center of the disk which is different from a marking M applied position to prevent coming-into-contact with the marking M when pulling it out of the rotary shaft 141A and prevent dust from adhering to the marking M. COPYRIGHT: (C)2006,JPO&NCIPI