US 12,092,805 B2
Laser light scanning device and laser light scanning method
Sohan Kawamura, Tokyo (JP); Yuichi Akage, Tokyo (JP); Takashi Sakamoto, Tokyo (JP); and Soichi Oka, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/625,532
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jul. 11, 2019, PCT No. PCT/JP2019/027465
§ 371(c)(1), (2) Date Jan. 7, 2022,
PCT Pub. No. WO2021/005773, PCT Pub. Date Jan. 14, 2021.
Prior Publication US 2022/0276477 A1, Sep. 1, 2022
Int. Cl. G02B 26/08 (2006.01); B23K 26/082 (2014.01); G02B 19/00 (2006.01); G02F 1/29 (2006.01); B23K 26/36 (2014.01)
CPC G02B 19/0004 (2013.01) [B23K 26/082 (2015.10); G02B 19/0047 (2013.01); G02F 1/29 (2013.01); B23K 26/36 (2013.01); G02F 2203/24 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A laser light scanning apparatus comprising:
an optical system configured to generate parallel light from laser light emitted from a light source;
an optical deflector configured to perform one-dimensional deflection on the parallel light from the optical system; and
a diffractive optical element configured to diffract deflected light from the optical deflector to obtain diffracted light, wherein the diffractive optical element is configured such that the diffracted light is focused along a predetermined axis that extends from the optical deflector toward the diffractive optical element to obtain focused diffracted light, and wherein a position at which the diffracted light is focused on the predetermined axis changes according to an incidence position of the deflected light.