Patent ID: 6504146
Filing Date: 2003-01-07
Classification: G01D

Abstract:
A disk-mounting structure for an optical encoder, comprising:a housing; a bearing attached to the housing; a shaft supported on the bearing; a rotating disk which is fixed to the shaft and has a code pattern comprising a light-obstructing part or a light-transmitting part, said rotating disk having a hole in its center through which the shaft penetrates and a rear surface thereof is seated on a step of said shaft; a photodetector which directly or indirectly receives light, from a light-emitting element, which has passed through the light-transmitting part of the rotating disk and changes the light to an electric signal; a board mounted with a circuit for detecting the amount of rotation or rotational position of the shaft from the electric signal; a spacer which is loosely fitted over the shaft and placed on an adhesive surface applied on the top surface of the rotating disk; a ring which is thrust onto the shaft for fixing the spacer and the rotating disk to the shaft; and adhesive applied on the spacer, the ring, and the shaft.