Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1995-09-29

1997-08-19

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

396120, 396123, G01C 308, G03B 1318

Patent

active

056593872

ABSTRACT:
A distance measuring apparatus comprises light emitting means for projecting light; light receiving means for receiving light; arithmetic means for performing arithmetic operation based on signals from the light receiving means; integrating means having an integrating capacitor, for integrating signals from the arithmetic means by discharging the integrating capacitor; detecting means for detecting distance based on signals from the integrating means; and charging means for performing preliminary charge of the integrating capacitor before the distance measurement is carried out. The present invention prevents voltage drop due to dielectric absorption of the integrating capacitor, thereby to solve problems of distance measurement error due to the voltage drop.

REFERENCES:
patent: 4938588 (1990-07-01), Taniguchi
patent: 4967223 (1990-10-01), Suzuki
patent: 5221955 (1993-06-01), Inoue
patent: 5493362 (1996-02-01), Nonaka
patent: 5534991 (1996-07-01), Maeda et al.

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