Scanning device and distance measuring device

1 . A scanning device comprising:

a first irradiation unit configured to radiate a first electromagnetic wave of infrared radiation for scanning an object of interest;

a second irradiation unit configured to radiate a second electromagnetic wave of visible light;

a scanning unit configured to deflect and output the first electromagnetic wave radiated by the first irradiation unit and the second electromagnetic wave radiated by the second irradiation unit;

a waveguide unit configured to guide the second electromagnetic wave output by the scanning unit in a second direction different from a first direction of the first electromagnetic wave; and

a detection unit configured to detect the second electromagnetic wave guided in the second direction by the waveguide unit,

wherein the waveguide unit allows the first electromagnetic wave radiated by the first irradiation unit to pass through the waveguide unit and reflects the second electromagnetic wave radiated by the second irradiation unit.

2 . The scanning device according to claim 1 ,

wherein the detection unit is positioned outside an irradiation range of the first electromagnetic wave output by the scanning unit.

3 . The scanning device according to claim 1 , further comprising:

a combining unit configured to make a direction of travel of the first electromagnetic wave and a direction of travel of the second electromagnetic wave match each other,

wherein the scanning unit deflects combined electromagnetic waves of the first electromagnetic wave and the second electromagnetic wave output from the combining unit.

4 . The scanning device according to claim 3 ,

wherein the combining unit is disposed at a position where the first electromagnetic wave radiated by the first irradiation unit and the second electromagnetic wave radiated by the second irradiation unit are incident on the combining unit.

5 . The scanning device according to claim 1 , further comprising:

an emitting unit configured to emit the first electromagnetic wave output by the scanning unit,

wherein the waveguide unit is disposed at a position on a path of the first electromagnetic wave output by the scanning unit, the path extending up to the emitting unit through which the first electromagnetic wave is emitted.

6 . The scanning device according to claim 1 ,

wherein the first irradiation unit includes a laser diode configured to radiate the infrared radiation as the first electromagnetic wave.

7 . The scanning device according to claim 6 ,

wherein the second irradiation unit includes a laser diode configured to radiate the visible light as the second electromagnetic wave.

8 . The scanning device according to claim 7 ,

wherein the detection unit includes a photodiode configured to detect the visible light radiated by the second irradiation unit.

9 . The scanning device according to claim 1 , further comprising:

a controller configured to detect an angle of rotation of the scanning unit based on detection of the second electromagnetic wave by the detection unit,

wherein the control unit is configured to detect the angle of the rotation based on a time elapsed from a timing at which the detection unit detects the second electromagnetic wave.

10 . A distance measuring device configured to measure a distance to an object of interest, the distance measuring device comprising:

the scanning device according to claim 1 .

11 . The scanning device according to claim 1 , wherein the waveguide unit is a cold mirror configured to guide the second electromagnetic wave in the second direction and pass the first electromagnetic wave through the waveguide unit in the first direction.

12 . A scanning device comprising:

a scanning unit configured to deflect a combined electromagnetic wave of infrared radiation and visible light incident thereon;

a waveguide unit configured to separate the electromagnetic wave deflected by the scanning unit into a first electromagnetic wave of the infrared radiation and a second electromagnetic wave of the visible light; and

a detection unit configured to detect the second electromagnetic wave output by the waveguide unit,

wherein the detection unit is disposed at a position outside an irradiation range of the first electromagnetic wave output from the waveguide unit,

wherein the waveguide unit allows the first electromagnetic wave to pass through the waveguide unit and reflects the second electromagnetic wave.

13 . A scanning device comprising:

a first irradiation unit configured to radiate a first electromagnetic wave of infrared radiation for scanning an object of interest;

a second irradiation unit configured to radiate a second electromagnetic wave of visible light;

a scanning unit configured to deflect and output the first electromagnetic wave radiated by the first irradiation unit and the second electromagnetic wave radiated by the second irradiation unit;

a waveguide unit configured to guide the second electromagnetic wave output by the scanning unit in a second direction different from a first direction of the first electromagnetic wave;

a detection unit configured to detect the second electromagnetic wave guided in the second direction by the waveguide unit; and

a controller configured to detect an angle of rotation of the scanning unit based on detection of the second electromagnetic wave by the detection unit,

wherein the control unit is configured to detect the angle of the rotation based on a time elapsed from a timing at which the detection unit detects the second electromagnetic wave.