Distance measuring device

Details Distance measuring device Distance measuring device

2006-09-12

2006-09-12

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C396S106000

Reexamination Certificate

active

07106423

ABSTRACT:
A distance measuring device includes a light emitter, a light detector, a clamp that outputs long-range side signal or clamp signal, a calculator that calculates the ratio between the short-range side signal and the signal output from the clamp and outputs a ratio signal, a light meter measuring the luminance of outside light, a threshold setter that sets up an infinity determination threshold value such that a lower luminance of the outside light corresponds to the longer range side as a threshold value; a converter that, when the output ratio signal is the signal corresponding to the short range side and is shorter than the infinity determination threshold value, converts the output ratio signal into a distance signal, and, if not, converts the output ratio signal into a distance signal having a fixed value.

REFERENCES:
patent: 4773751 (1988-09-01), Matsuda et al.
patent: 6026246 (2000-02-01), Yoshida et al.
patent: 6928240 (2005-08-01), Miwa
patent: 2004/0202462 (2004-10-01), Miwa
patent: 10-281756 (1998-10-01), None
patent: 11-281882 (1999-10-01), None

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