US 12,449,569 B2
Wavefront control element, lighting device, and projector
Fumika Yamada, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Sep. 29, 2022, as Appl. No. 17/955,870.
Claims priority of application No. 2021-160802 (JP), filed on Sep. 30, 2021.
Prior Publication US 2023/0102400 A1, Mar. 30, 2023
Int. Cl. G02B 3/00 (2006.01); G02B 1/00 (2006.01); G02B 3/02 (2006.01); G02B 5/18 (2006.01); G03B 21/14 (2006.01)
CPC G02B 3/0037 (2013.01) [G02B 1/002 (2013.01); G02B 3/02 (2013.01); G02B 5/18 (2013.01); G03B 21/14 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A wavefront control element configured to control a wavefront of incident light, the wavefront control element comprising:
a plurality of metasurface regions, wherein
the plurality of metasurface regions are arranged in an array, and each of the plurality of metasurface regions has a lens function,
each of the plurality of metasurface regions converges or diverges the incident light, and
the incident light converges to one point at a side opposite to an incident side or at a side identical to the incident side in a direction along an optical axis of the incident light.