Object distance detecting apparatus

Details Object distance detecting apparatus Object distance detecting apparatus

1991-06-06

1993-04-20

Adams, Russell E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 1, 2502016, G03B 1336

Patent

active

052047148

ABSTRACT:
An object distance detecting apparatus having a light projecting device for projecting a pulse light toward an object to be photographed and a primary semiconductor position detecting device for receiving the reflected light from the object by this light projecting device and outputting a first current value and second current value corresponding to the object distance, comprising:
a first integrating circuit for integrating a predetermined number of times the added value of the above-mentioned first current value and second current value, a second integrating circuit for integrating a predetermined number of times the ratio operating value of the above-mentioned both current values, a first calculating device for calculating the object distance on the basis of the square of the output of the above-mentioned first integrating circuit and a second calculating device for calculating the object distance on the basis of the output of the above-mentioned second integrating circuit so that, when the output of the first calculating means shows a distance nearer than a predetermined value, the output of the above .mentioned second calculating device will be made a definite distance value but, when the output of the first calculating device shows a distance farther than the predetermined value, the output of the above-mentioned first calculating device will be made a definite distance value.

REFERENCES:
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4573783 (1986-03-01), Maruyama
patent: 4623237 (1986-11-01), Kaneda et al.
patent: 5082363 (1992-01-01), Nakanishi et al.

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