Patent ID: 7312878
Filing Date: 2007-12-25
Classification: G02B

Abstract:
1. A method for manufacturing a scale for a photoelectric position measuring device in the form of a phase grating, having two reflective layers arranged a distance apart on either side of a spacer layer, comprising: producing a first reflective layer as a continuous layer over an entire surface, which satisfies the condition A=R/η≧3, in which R represents an energy-based reflectance for light at a wavelength in a range from 250 nm to 1600 nm impinging perpendicularly on the first reflective layer, and η represents a backscatter coefficient for electrons that are accelerated using a voltage of 20 kV after being released and that impinge on the first reflective layer at a right angle; applying the spacer layer to the first reflective layer; applying a second reflective layer to the spacer layer; and structuring the second reflective layer using an electron-beam lithography process.