Rotation Encoder Disc

Rotation encoder discs on test pattern

Epigem has applied its UV embossing process to the manufacture of sub-micron period diffraction gratings for use in optical rotation encoders and linear position measuring systems. UV embossed radial gratings have low ellipticity, high diffraction efficiency (36% at 633 nm) and reproduce the desired physical dimensions to within 0.03%. Quartz or glass substrates can be used to give the discs improved thermal stability over similar parts made entirely of plastic.