Graduation carrier of plastics material with a graduation structure and fresnel zone ring

Claim 1

In a graduation carrier of plastic material with a graduation structure, particularly for a photoelectric position-measuring device, the improvement comprising the graduation structure being an especially prefabricated lamina which is integrated on the graduation carrier with positive engagement, the graduation structure and the graduation carrier having free surfaces, the free surfaces of the graduation structure and of the graduation carrier being located in a plane, a hub being integrally cast to the graduation carrier, the graduation carrier being circular, the hub being provided with a toothing, the graduation carrier having a circular periphery, the graduation carrier further comprising a toothing on the periphery, wherein an optically effective structure is formed in the graduation carrier, and wherein the optically effective structure is a Fresnel zone ring.