Optics: measuring and testing – Range or remote distance finding – Triangulation ranging to a point with one projected beam
Patent
1994-06-17
1996-07-30
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
Triangulation ranging to a point with one projected beam
356 303, 356 306, G01C 300
Patent
active
055417230
ABSTRACT:
A distance measuring device according to the present invention includes a light projector, a controller, and a light receiver. The light projector projects light toward an object to be measured, and the controller controls the light projector to carry out a first light projection to emit a first light at a predetermined angle with a first light distribution, and subsequently to carry out a second light projection to emit a second light at the predetermined angle with a second light distribution which is different from the first light distribution. The light receiver receives the first and second light emitted by the light projector and reflected from the object, and produces light reception signals, and a circuit arrangement calculates a distance to the object by means of the light reception signals.
With the invention, by projecting multiple distance measuring beams of light having different luminous intensity distributions toward a certain distance measurement point of the object at different times and calculating the object distance based on the output from the light receiver means which is obtained as a result of the projections, correct object distance information can be obtained even if vignetting exists.
REFERENCES:
patent: 5191384 (1993-03-01), Nakanishi et al.
patent: 5221955 (1993-06-01), Inoue
Hellner Mark
Minolta Camera Kabushiki Kaisha
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