Patent ID: 6069737
Filing Date: 2000-05-30
Classification: G01V,G02B

Abstract:
A light grid arrangement, comprising:a plurality of transmitting and/or receiving optical systems; each of the systems including at least one diffractive optical element integrated into transparent material, with at least two different optical functions being realized by a unit including the transparent material and the diffractive optical element; anda plurality of sensors arranged in series with respective transmitting and/or receiving optical systems arranged alongside one another, wherein at least a part of the transmitting and/or receiving optical systems for all sensors is integrated into a total of two polarizing foil filter strips, which lie above one another and which polarize perpendicular to one another, with the first polarizing foil filter strip having an aperture in regions where diffractive optical elements are integrated into the second polarizing foil filter strip, and wherein the second polarizing foil filter strip has in each case an aperture in regions where the receiving diffractive optical elements are integrated into the first polarizing foil filter strip.