US 12,270,991 B2
Optical device, line-of-sight detection device, retinal projection display device, head-mounted display, optometric device, user-condition estimation apparatus, driver-assistance system, method of detecting degree of inclination of three-dimensional object, and line-of-sight detection method
Masato Yoshikawa, Kanagawa (JP); Suguru Sangu, Kanagawa (JP); and Saori Yoshida, Miyagi (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Masato Yoshikawa, Kanagawa (JP); Suguru Sangu, Kanagawa (JP); and Saori Yoshida, Miyagi (JP)
Filed on Mar. 3, 2022, as Appl. No. 17/653,302.
Claims priority of application No. 2021-042908 (JP), filed on Mar. 16, 2021; and application No. 2022-003943 (JP), filed on Jan. 13, 2022.
Prior Publication US 2022/0299762 A1, Sep. 22, 2022
Int. Cl. G06F 3/01 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0093 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0138 (2013.01); G02B 2027/014 (2013.01); G02B 2027/0178 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An optical device comprising:
a plurality of light emitters configured to irradiate an object with light;
a detector configured to detect the light reflected by the object and output a signal based on the light reflected by the object; and
circuitry configured to output data of a degree of inclination of the object obtained based on an output signal output from the detector,
wherein the light emitted from the plurality of light emitters is temporally modulated by a code having orthogonality,
wherein the plurality of light emitters include a first light emitter and a second light emitter,
wherein the first light emitter emits the light at a timing different from a timing at which the second light emitter emits the light, and
wherein the circuitry is configured to output the data of the degree of inclination of the object estimated based on a computed inner product of the output signal and an encoding pattern of the light.