MUMBAI, India, July 13 -- Intellectual Property India has published a patent application (202617073686 A) filed by Sioptica Gmbh on June 13, 2026, for Optical Waveguide And Illumination Device For A Free And A Restricted Viewing Mode With Such An Optical Waveguide.
Inventor includes Bourgin, Yannick.
The application for the patent was published on July 10, 2026, under issue no. 28/2026.
Abstract: The invention relates to a flat optical waveguide (3) having two large surfaces and having narrow sides which connect the large surfaces at their edges. The optical waveguide (3) comprises a plurality of individual lighting means (4a, 4b, …) which are arranged in series and which have an average central spacing of p and have radiating surfaces, wherein one of the narrow sides of the optical waveguide (3) is formed as a coupling-in side (5) for light from the lighting means (4a, 4b, …). The optical waveguide (3) furthermore comprises coupling-out elements (6) which are arranged on at least one of the large surfaces of the optical waveguide (3) and/or within its volume, wherein each coupling-out element (6) has at least one functional surface for defined coupling-out of light from the optical waveguide (3), and in the event of projection onto one of its large surfaces, all coupling-out elements lie completely within a defined region (B) projected onto the large surface. At the end of the series, a final lighting means (4x) is arranged, wherein the narrow side closest to the final lighting means (4x) at the end of the series of lighting means (4a, 4b, …) has at least one straight-line portion, and wherein the final lighting means (4x) is oriented at the coupling-in side (5) in such a manner that the centroid of its radiating surface is arranged at a distance p/2, with an orientation tolerance of at most +/-0.3*p, from an intersection point (S) of the projection of an imaginary extension of the longest straight-line portion of the narrow side having the coupling-in side (5) and closest to the final lighting means (4x) at the end of the series of lighting means (4a, 4b, …), wherein the distance p/2 is measured in the direction of the longest expansion of the coupling-in side (5), as a result of which some of the light which is radiated from the final lighting means (4x) into the optical waveguide (3) is totally reflected there, and thus for at least half of an area of the defined region (B) of the optical waveguide (3) the luminance homogeneity of the light coupled out of at least one of the large surfaces, measured at three angles which each differ from one another by at least 20° and lie in a plane through the central vertical to the corresponding large surface of the optical waveguide (3), is in each case greater than 50%. 2c
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