Distance measuring method and apparatus that compares signals fr

Details Distance measuring method and apparatus that compares signals fr Distance measuring method and apparatus that compares signals fr

1993-03-19

1995-04-18

Limanek, Robert P.

Optics: measuring and testing

By polarized light examination

With light attenuation

250560, G01B 1124

Patent

active

054083249

ABSTRACT:
A distance measuring method and apparatus accurately detects point in time when reflected slit light passes a cell constituting an imaging plane. Each of the cells constituting the imaging plane includes a pair of photo-sensors disposed side by side along the direction of movement of the reflected slit light. A comparator compares photoelectric currents outputted from the pair of photo-sensors, and a point in time at which the reflected slit light moves from a first one to a second one of the photo-sensors of the cell is determined based on the output of the comparator. The point in time thus detected is determined as a point in time at which the reflected slit light passes the cell and is used for measurement of the distance to the subject for measurement.

REFERENCES:
patent: 4794262 (1988-12-01), Sato et al.
patent: 4991968 (1991-02-01), Yonescu et al.
patent: 4993835 (1991-02-01), Inoue et al.
patent: 5107103 (1992-04-01), Gruss et al.
Applied Optics vol. 32, No. 13, 1 May 1993, New York US pp. 2323-2330 XP362799 Kramer et al "Inexpensive Range Camera Operating at Video Speed".
IEEE Journal of Solid-State Circuits vol. 26, No. 3, 1 Mar. 1991, New York US pp. 184-190 XP222594 Gruss et al "Integrated Sensor and Range-Finding Analog Signal Processor".

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