Rotary encoder having code member rotating along accurate circle as shaft rotates
AssigneeAlps Electric Co., Ltd.
InventorsHideki Uchiyama, Toshio Ogawa, Hirofumi Okumura
Life of this patent
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Abstract
An object of the present invention is to provide a rotary encoder that has a code member which rotates so as to draw an accurate circle as a shaft rotates. Such rotary encoder includes a casing; a detection element attached to the casing; and a rotatable rotor having a mounting aperture for inserting a shaft at the center thereof and being provided with a code member opposing to the detection element, in which an inner peripheral surface of the mounting aperture is provided with a spring member having a base and a plurality of tongues for energizing the shaft toward the center of the mounting aperture so as to set a position of the shaft at the center of the mounting aperture.
Claims3
A rotary encoder, comprising:
- a casing;
- a detection element attached to the casing;
- and
- a rotatable rotor having a mounting aperture for inserting a shaft at the center thereof and being provided with a code member opposing to the detection element,
- wherein an inner peripheral surface of the mounting aperture is provided with a spring member having a base and a plurality of tongues for energizing the shaft toward the center of the mounting aperture so as to set a position of the shaft at the center of the mounting aperture, and
- wherein the spring member is formed of a long hoop-shaped metal plate, the plurality of tongues are in series with the base of the spring member so as to project from the base, and the spring member has a cylindrical shape due to a cutting operation on a hoop material to a length corresponding to a length in a direction of the diameter of the shaft and the cylindrical spring member is disposed so as to be wound around the shaft.
Dependencies are inferred from the claim text.