Distance measuring device

Details Distance measuring device Distance measuring device

2005-09-13

2005-09-13

Perkey, W. B. (Department: 2851)

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

C396S120000, C356S003040

Reexamination Certificate

active

06944397

ABSTRACT:
A distance measuring device includes light a projector for projecting a beam of light onto an object at a distance to be measured, a light detector for detecting the part of the beam of light reflected from the object and outputting an output signal, an integrator for discharging or charging an integration capacitor corresponding to the output signal to integrate the output signal, an analog-to-digital converter for converting the voltage of the integration capacitor after a predetermined number of repetitions of a distance measuring routine, and a detector for detecting the distance to the object based on the converted signal, wherein the number of repetitions of the distance measuring routine is set to saturate the integration capacitor through the repetition, when the object is located at a short range alarm position.

REFERENCES:
patent: 5001508 (1991-03-01), Ogawa
patent: 5107449 (1992-04-01), Ikuta
patent: 6188843 (2001-02-01), Yoshida
patent: 6188844 (2001-02-01), Yoshida
patent: 6415241 (2002-07-01), Yoshida
patent: 6452664 (2002-09-01), Miwa
patent: 2004/0202462 (2004-10-01), Miwa
patent: 5-28093 (1993-02-01), None
patent: 2000-180713 (2000-06-01), None
Englisn abstract of Japanese Patent No. JP5280973, Oct. 1993.

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