OBJECT DETECTING DEVICE AND INFORMATION ACQUIRING DEVICE
An information acquiring device includes a projecting portion which projects a laser light emitted from a laser light source onto a target area, and a light receiving portion which receives the laser light reflected on the target area. The light receiving portion includes a color image sensor. The color image sensor has characteristics such that a detection sensitivity of a pixel that detects light of a predetermined color gradually decreases, and detection sensitivities of pixels that detect light of colors other than the predetermined color respectively have local maximum values on a long wavelength side than a visible light region, the detection sensitivities of the respective pixels substantially coinciding with each other in a wavelength band near a wavelength at which the local maximum values are given. An emission wavelength of the laser light source is set to a wavelength in the wavelength band.
1 . An information acquiring device, comprising:
a laser light source which emits laser light;
a projecting portion which projects the laser light emitted from the laser light source onto a target area; and
a light receiving portion which receives the laser light reflected on the target area, wherein
the light receiving portion includes a color image sensor into which the laser light reflected on the target area enters,
the color image sensor has characteristics such that a detection sensitivity of a pixel that detects light of a predetermined color gradually decreases, and detection sensitivities of pixels that detect light of colors other than the predetermined color respectively have local maximum values on a long wavelength side than a visible light region, the detection sensitivities of the respective pixels substantially coinciding with each other in a wavelength band near a wavelength at which the local maximum values are given, and
an emission wavelength of the laser light source is set to a wavelength in the wavelength band.
2 . The information acquiring device according to claim 1 , wherein
the emission wavelength of the laser light source is in a range of from 810 to 870 nm.
3 . The information acquiring device according to claim 2 , wherein
the emission wavelength of the laser light source is in a range of 830±10 nm.
4 . The information acquiring device according to claim 3 , wherein
the emission wavelength of the laser light source is set to 830 nm.
5 . The information acquiring device according to claim 1 , wherein
the emission wavelength of the laser light source is set to a wavelength near the wavelength at which the detection sensitivity of a pixel that detects light of one of the colors other than the predetermined color has the local maximum value.
6 . The information acquiring device according to claim 1 , wherein
the projecting portion includes a diffractive optical element which converts the laser light emitted from the laser light source into light having a dot pattern by a diffraction effect of the diffractive optical element, and
the light receiving portion is disposed to align with the projecting portion at a position away from the projecting portion by a predetermined distance.
7 . The information acquiring device according to claim 1 , wherein
the light receiving portion further includes a filter which guides only light in a wavelength band including the emission wavelength of the laser light source to the color image sensor.
8 . The information acquiring device according to claim 1 , wherein
the color image sensor includes pixels that detect red light, green light, and blue light.
9 . An object detecting device, comprising
an information acquiring device,
the information acquiring device including:
a laser light source which emits laser light;
a projecting portion which projects the laser light emitted from the laser light source onto a target area; and
alight receiving portion which receives the laser light reflected on the target area, wherein
the light receiving portion includes a color image sensor into which the laser light reflected on the target area enters,
the color image sensor has characteristics such that a detection sensitivity of a pixel that detects light of a predetermined color gradually decreases, and detection sensitivities of pixels that detect light of colors other than the predetermined color respectively have local maximum values on a long wavelength side than a visible light region, the detection sensitivities of the respective pixels substantially coinciding with each other in a wavelength band near a wavelength at which the local maximum values are given, and
an emission wavelength of the laser light source is set to a wavelength in the wavelength band.
10 . The object detecting device according to claim 9 , wherein
the emission wavelength of the laser light source is in a range of from 810 to 870 nm.
11 . The object detecting device according to claim 10 , wherein
the emission wavelength of the laser light source is in a range of 830±10 nm.
12 . The object detecting device according to claim 11 , wherein
the emission wavelength of the laser light source is set to 830 nm.
13 . The object detecting device according to claim 9 , wherein
the emission wavelength of the laser light source is set to a wavelength near the wavelength at which the detection sensitivity of a pixel that detects light of one of the colors other than the predetermined color has the local maximum value.
14 . The object detecting device according to claim 9 , wherein
the projecting portion includes a diffractive optical element which converts the laser light emitted from the laser light source into light having a dot pattern by a diffraction effect of the diffractive optical element, and
the light receiving portion is disposed to align with the projecting portion at a position away from the projecting portion by a predetermined distance.
15 . The object detecting device according to claim 9 , wherein
the light receiving portion further includes a filter which guides only light in a wavelength band including the emission wavelength of the laser light source to the color image sensor.
16 . The object detecting device according to claim 9 , wherein
the color image sensor includes pixels that detect red light, green light, and blue light.