US 11,703,573 B2
Distance measurement device and distance measurement method
Kazuhide Namba, Kanagawa (JP); and Yusuke Moriyama, Kanagawa (JP)
Assigned to Sony Semiconductor Solutions Corporation, Kanagawa (JP)
Appl. No. 16/463,472
Filed by Sony Semiconductor Solutions Corporation, Kanagawa (JP)
PCT Filed Nov. 28, 2017, PCT No. PCT/JP2017/042631
§ 371(c)(1), (2) Date May 23, 2019,
PCT Pub. No. WO2018/101262, PCT Pub. Date Jun. 7, 2018.
Claims priority of application No. 2016-233407 (JP), filed on Nov. 30, 2016.
Prior Publication US 2019/0353754 A1, Nov. 21, 2019
Int. Cl. G01S 7/484 (2006.01); G01C 3/06 (2006.01); G01S 17/10 (2020.01); G01S 17/931 (2020.01)
CPC G01S 7/484 (2013.01) [G01C 3/06 (2013.01); G01S 17/10 (2013.01); G01S 17/931 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A distance measurement device comprising:
circuitry configured to function as:
a light emitting unit configured to emit irradiation light;
a light receiving unit configured to receive reflected light which is the irradiation light reflected by a target object;
a calculation unit configured to calculate a distance to the target object on a basis of time between the emission of the irradiation light and the reception of the reflected light;
a random number generation unit configured to generate a random number on a basis of information generated in the light receiving unit; and
a control unit configured to control the emission of the irradiation light,
wherein a first frame being a period that the distance is calculated includes a plurality of subframes being periods that the irradiation light is emitted, and
the control unit controls the emission of the irradiation light so that, between the first frame and a second frame following the first frame, timing of head subframes differs and, during the period of the first frame, intervals between the subframes become constant.