Ranging apparatus and ranging method

Details Ranging apparatus and ranging method Ranging apparatus and ranging method

2011-01-11

2011-01-11

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S005010, C356S005110, C356S005150

Reexamination Certificate

active

07869007

ABSTRACT:
A first ranging apparatus includes a synchronizing signal generator for generating a synchronizing signal at a constant interval, a light-emitting unit for emitting an intensity-modulated light in response to the synchronizing signal input thereto, a light-detecting unit for detecting a reflected light from an object irradiated with the modulated light, in response to the synchronizing signal input thereto, a calculating unit for calculating the distance up to the object based on the phase difference between the modulated light and the reflected light, and a synchronizing signal control unit for changing an arrival time of the synchronizing signal from the synchronizing signal generator at the light-detecting unit, depending on the number of times that the synchronizing signal is generated. The light-detecting unit samples the amount of the reflected light in exposure periods established at a constant cycle length with reference to a time at which the synchronizing signal is input thereto.

REFERENCES:
patent: 4756617 (1988-07-01), Cain et al.
patent: 5877851 (1999-03-01), Stann et al.
patent: 3758618 (2004-02-01), None

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