Multiple ranging apparatus
A multiple ranging apparatus has a light emitting section constituted by a plurality of aligned LEDs which emit light rays of wavelengths different from one another, and a light receiving section constituted by a plurality of aligned PSD parts which have wavelength sensitivities corresponding to the different wavelengths of the light rays emitted from the LEDs. Thus, even when ranging of respective points is simultaneously measured in multiple ranging measurement, it is possible to identify which LED the light is emitted from, and therefore, to simultaneously measure the distances of two or more points.
1. A multiple ranging apparatus comprising:
a light emitting section;
an optical lens for beam-forming light emitted from the light emitting section;
a condensing section for condensing part of light emitted from the light emitting section and diffusely reflected by an object to form light spots; and
a light receiving section for outputting signals which represent:
a) amounts of received light of the light spots formed by the condensing section, and
b) positions of the light spots;
wherein the light emitting section includes a wavelength multiplying unit for multiplying a wavelength of the emitted light; and
wherein the light receiving section includes a wavelength-by-wavelength light receiving unit for separating and receiving the light rays having a plurality of wavelengths multiplied by the wavelength multiplying unit.
2. The multiple ranging apparatus as claimed in claim 1 , wherein
the wavelength multiplying unit is formed by a plurality of light emitting elements which respectively emit light rays having wavelengths different from one another.
3. The multiple ranging apparatus as claimed in claim 1 , wherein
the light receiving section includes a plurality of PSDs.
4. The multiple ranging apparatus as claimed in claim 3 , wherein
the plurality of PSDs have wavelength sensitivities different from one another and constitute the wavelength-by-wavelength light receiving unit.
5. The multiple ranging apparatus as claimed in claim 1 , wherein
the condensing section is formed by a convex lens.
6. The multiple ranging apparatus as claimed in claim 1 , wherein
the condensing section is formed by a toroidal lens.
7. The multiple ranging apparatus as claimed in claim 1 , wherein the wavelength multiplying unit is formed by a plurality of optical filters which permit light rays having wavelengths different from one another to pass through, and
wherein the light receiving section includes a plurality of PSDs.