US 12,259,563 B2
Light field imaging device and method for 3D sensing
Jonathan Ikola Saari, Halifax (CA); Ji-Ho Cho, Montreal (CA); and Pascal Grégoire, Montreal (CA)
Assigned to AIRY3D INC., Montreal (CA)
Appl. No. 17/596,184
Filed by AIRY3D INC., Montreal (CA)
PCT Filed Jun. 3, 2020, PCT No. PCT/CA2020/050760
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/243828, PCT Pub. Date Dec. 10, 2020.
Claims priority of provisional application 62/857,469, filed on Jun. 5, 2019.
Prior Publication US 2022/0221733 A1, Jul. 14, 2022
Int. Cl. G02B 27/42 (2006.01); G02B 5/18 (2006.01); H04N 23/957 (2023.01); H04N 25/11 (2023.01)
CPC G02B 27/4211 (2013.01) [G02B 5/1842 (2013.01); G02B 5/1871 (2013.01); H04N 25/11 (2023.01); H04N 23/957 (2023.01)] 20 Claims
OG exemplary drawing
 
19. A light field imaging device, comprising:
a diffraction grating assembly configured to receive an optical wavefront incident from a scene, the diffraction grating assembly comprising a phase diffraction grating having a grating axis and a refractive index modulation pattern with a grating period along the grating axis, the refractive index modulation pattern comprising a series of ridges periodically spaced-apart at the grating period, interleaved with a series of grooves periodically spaced-apart at the grating period, the diffraction grating being configured to diffract the optical wavefront to generate a diffracted wavefront; and
a pixel array having a plurality of light-sensitive pixels disposed under the diffraction grating assembly and configured to detect the diffracted wavefront in a near-field region, the pixel array having a pixel pitch along the grating axis, a ratio of the pixel pitch to the grating period being equal to (2n+1)/2, where n is a positive integer.