US 11,808,855 B2
Optical device, range sensor using optical device, and mobile object
Toshiyuki Ikeoh, Duesseldorf (DE); Yasufumi Yamada, Osaka (JP); Atsushi Sakai, Tokyo (JP); Naoto Jikutani, Miyagi (JP); Tsuyoshi Ueno, Kanagawa (JP); Nobunari Tsukamoto, Osaka (JP); Tadashi Nakamura, Kanagawa (JP); Kazuma Izumiya, Miyagi (JP); and Shuichi Suzuki, Kanagawa (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Appl. No. 16/772,897
Filed by RICOH COMPANY, LTD., Tokyo (JP)
PCT Filed Feb. 1, 2019, PCT No. PCT/JP2019/003638
§ 371(c)(1), (2) Date Jun. 15, 2020,
PCT Pub. No. WO2019/176360, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 2018-044805 (JP), filed on Mar. 12, 2018.
Prior Publication US 2021/0165101 A1, Jun. 3, 2021
Int. Cl. G01S 17/89 (2020.01); G01S 17/894 (2020.01); G01S 7/481 (2006.01); G01S 17/42 (2006.01); G02B 26/10 (2006.01)
CPC G01S 17/89 (2013.01) [G01S 7/4817 (2013.01); G01S 17/42 (2013.01); G01S 17/894 (2020.01); G02B 26/105 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical device comprising:
a light source provided with a plurality of surface-emitting laser elements configured to emit a laser beam;
a scanner configured to scan the laser beam emitted from the light source; and
an optical system disposed in an optical path between the light source and the scanner and configured to guide the laser beam to the scanner,
the optical system including
a first optical element configured to reduce a divergence angle of the laser beam emitted from the light source, and
a second optical element configured to concentrate the laser beam that has passed through the first optical element onto a to-be-scanned surface of the scanner, wherein the scanner is located at a beam waist position that corresponds a focal point of the second optical element.