Three-dimensional measurement device and three-dimensional measurement method
a three-dimensional measurement and measurement device technology, applied in the field of three-dimensional measurement devices and three-dimensional measurement methods, can solve the problems of difficult high-speed measurement at short distances, difficult to make a device compact, and difficult to measure distance range, so as to increase the distance range
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first embodiment
Device Structure
[0035] FIGS. 1(a) and 1(b) show the structure of a three-dimensional measure device of the first embodiment. FIG. 1(a) shows the entire structure, and FIG. 1(b) shows the structure of the image sensing surface.
[0036] A three-dimensional measurement device 1 is provided with a light source 11, projection lens 12, light receiving lens 21, and solid state area sensor 22. The light source 11 receives power from a light generating circuit 32, and emits laser light. An object Q is illuminated by the laser light passing through the projection lens 12. The light reflected from the object Q passes through the light receiving lens 21, and impinges the solid state area sensor 22. The solid state area sensor 22 has pixels which block the light from outside the device, and part of the laser light from the light source 11 passes through an internal optical path 15 comprised of optical fiber without passing outside and directly impinges the pixel as “standard light.” Hereinafter...
second embodiment
[0103] Laser light is most suitable as the signal medium in distance measurement using the TOF method. However, since measurement of light propagation time is an event performed at high speed, it is difficult to ensure high accuracy at near-field distances. measurement of constant precision can be realized regardless of whether the distance is near-field or not by using the TOF method and the triangulation method.
Device Construction
[0104]FIG. 18 shows the structure of a three-dimensional measurement device of the second embodiment.
[0105] The three-dimensional measurement device 2 has, in addition to the structural elements of the three-dimensional measurement device 1 shown in FIG. 1, a triangulation density gradient filter 19, filter controller 38, and mode switch 39.
[0106] The function of the density gradient filter 19 is variable, an includes projecting a first light and a second light having different luminous intensity distributions, and a substantially through-like state ...
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