Optics: measuring and testing – Range or remote distance finding – Triangulation ranging to a point with one projected beam
Patent
1999-05-03
2000-08-15
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
Triangulation ranging to a point with one projected beam
2502016, 356 307, 356 308, 396 96, 396106, G01C 300, G03B 300, G03B 1300
Patent
active
061044768
ABSTRACT:
A distance measuring apparatus having skimming function which suppresses electric consumption when a charge storing period is shortened by an electronic shutter function. For this purpose, at an initial setting, an integration period is set to T.sub.1 by ICG pulse and ST pulse, and ON and OFF periods of light emitting diode IRED are set to the same periods. In the ON period, photoelectric conversion is performed on reflected light from a measurement object, and the obtained charge is stored. In the OFF period, a predetermined amount of charge is eliminated by an ICG pulse a, then after the period T.sub.1, the stored charge is transferred to a storage unit on the next stage by an ST pulse b. If an output voltage after several storing operations is higher than a skim judgment voltage, the integration period T.sub.1 is reduced in half, and the ON period of the IRED is shortened.
REFERENCES:
patent: 5848305 (1998-12-01), Takasaki
patent: 5850282 (1998-12-01), Egawa
patent: 5870178 (1999-02-01), Egawa et al.
patent: 5963308 (1999-10-01), Takasaki et al.
Buczinski Stephen C.
Canon Kabushiki Kaisha
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