US 11,835,416 B2
Polarizing filter
Stefano Sonzogni, Bergamo (IT); and Angelo Dolci, Bergamo (IT)
Assigned to MEI S.r.l., Bergamo (IT)
Appl. No. 17/276,512
Filed by MEI S.r.l., Bergamo (IT)
PCT Filed Sep. 9, 2019, PCT No. PCT/EP2019/073958
§ 371(c)(1), (2) Date Mar. 16, 2021,
PCT Pub. No. WO2020/058022, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 18195692 (EP), filed on Sep. 20, 2018.
Prior Publication US 2021/0318204 A1, Oct. 14, 2021
Int. Cl. G01N 21/21 (2006.01); G01M 11/02 (2006.01); G02B 5/30 (2006.01); G02B 27/28 (2006.01)
CPC G01M 11/0221 (2013.01) [G01N 21/21 (2013.01); G02B 5/3025 (2013.01); G02B 27/28 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus (1) for determining an orientation of a lens polarization axis of a polarized lens (31), comprising:
a light source (10) for emitting non-polarized light (11),
a lens receiving section (30) for receiving the polarized lens (31),
polarizing filter (20) comprising a plurality of areas (25) for passing light, each area (25) being separated from the others, wherein each of the areas (25) is a linear polarizer and at least two of the areas (25) have a different polarization axis,
wherein the lens receiving section (30) and the polarizing filter (20) are arranged such that light (11) emitted by the light source (10) successively passes through the plurality of areas (25) of the polarizing filter (20) and the lens receiving section (30),
a light intensity measuring device (41) for receiving light (31) of the light source (10) which has passed the plurality of areas (25) of the polarizing filter (20) and the lens receiving section (30), wherein the light intensity measuring device (41) is configured to detect different light intensities related to the respective areas (25) of the polarizing filter (20), the polarized lens (31) being positioned in the lens receiving section (30),
wherein the light intensity measuring device (41) comprises a camera, a camera-based system, an individual light detector and/or a multiple light detector, and
a control system (40) to control at least the light intensity measuring device (41) for determining the orientation of the lens polarization axis of a polarized lens (31) positioned in the lens receiving section (30) based on the detected different light intensities of the respective areas (25) in correlation with their respective polarization axes.