Patent ID: 9453744
Filing Date: 2016-09-27
CPC Classification: G01B,G01D

Claim Text:
1. A measuring graduation for a photoelectric position measuring device for measuring positions in a first direction and in a second direction extending orthogonally to the first direction, the measuring graduation comprising: a phase grating having a periodic array of grating elements in the first direction and in the second direction, wherein the grating elements each have an outer contour that is formed by a continuous line which includes two mutually opposing first straight edges, two mutually opposing second straight edges extending perpendicularly to the first straight edges, and connecting lines extending between the first straight edges and the second straight edges, the connecting lines forming an obtuse angle with the first straight edges and with the second straight edges, wherein the grating elements each comprise a first area percentage and a second area percentage, the first area percentage being a reflecting surface area having the outer contour, and the second area percentage being a reflecting surface area surrounding the first area percentage, and wherein the first area percentage is raised or recessed relative to the second area percentage, and wherein the first area percentage and the second area percentage are configured to allow same light intensities to be reflected.