Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1994-04-19
1995-03-21
Gellner, Michael L.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 311, G03B 1336, G01C 300
Patent
active
054001110
ABSTRACT:
A distance measurement device includes a light projection unit for projecting light towards plural objects in different areas of a scene to measure respective distances to the objects. A photo-sensing unit receives reflected light from the different areas of the scene. Also provided is a processing unit which has a first mode and a second mode. The first mode is for measuring the respective distances to the objects based on a first photo-sense output of the photo-sensing unit corresponding to light projected to the different areas of the scene and reflected by the objects. The second mode is for judging, based on a second photo-sense output of the photo-sensing unit corresponding to light projected to a specific area and reflected by at least one of the objects, whether the at least one object is located outside of a distance measuring area within which a distance to the at least one object can be measured using the first mode. A selecting unit selects one of the first and second modes such that the first and second modes operate independently of each other.
REFERENCES:
patent: 4908648 (1990-03-01), Sawabe et al.
patent: 4943824 (1990-07-01), Nabeshima et al.
patent: 4947202 (1990-08-01), Kitajima et al.
patent: 4983033 (1991-01-01), Suzuki
patent: 5006700 (1991-04-01), Kosaka et al.
patent: 5051766 (1991-09-01), Nonaka et al.
patent: 5223885 (1993-06-01), Nakajima
Maeda Kazuyuki
Taka Hideo
Canon Kabushiki Kaisha
Gellner Michael L.
Noh Jae N.
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