US 11,656,475 B2
Structured light projector
Hung-Shan Chen, Tainan (TW); and Yen-Chen Chen, Tainan (TW)
Assigned to LIQXTAL TECHNOLOGY INC., Tainan (TW)
Filed by LIQXTAL TECHNOLOGY INC., Tainan (TW)
Filed on Jan. 21, 2022, as Appl. No. 17/581,823.
Application 17/581,823 is a division of application No. 15/970,856, filed on May 3, 2018, granted, now 11,269,193.
Claims priority of provisional application 62/590,662, filed on Nov. 27, 2017.
Prior Publication US 2022/0146846 A1, May 12, 2022
Int. Cl. G02B 27/42 (2006.01); G01B 11/25 (2006.01); G02B 5/32 (2006.01); G03B 21/00 (2006.01); G02B 5/30 (2006.01); H04N 13/254 (2018.01); G02B 27/28 (2006.01); G03B 21/20 (2006.01); G01N 21/88 (2006.01)
CPC G02B 27/425 (2013.01) [G01B 11/2513 (2013.01); G02B 5/3083 (2013.01); G02B 5/32 (2013.01); G02B 27/286 (2013.01); G03B 21/00 (2013.01); H04N 13/254 (2018.05); G01N 2021/8829 (2013.01); G03B 21/20 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A structured light projector, comprising:
a light source, configured to emit a light beam;
at least two beam multiplication films, disposed on a transmission path of the light beam and made of anisotropic refractive index material, wherein a plurality of separated light beams are produced after the light beam from the light source passes through any one of the at least two beam multiplication films, so as to form structured light;
a wave plate, disposed between each of adjacent two of the at least two beam multiplication films, wherein a polarization state of the light beam is changed from linear polarization to circular polarization or elliptical polarization after the light beam passes through the wave plate; and
another wave plate, disposed between adjacent two of the at least two beam multiplication films and a diffractive optical element, wherein a polarization state of the light beam is changed from linear polarization to circular polarization or elliptical polarization after the light beam passes through the another wave plate.