Optical distance measuring apparatus and method using light proj

Details Optical distance measuring apparatus and method using light proj Optical distance measuring apparatus and method using light proj

1990-12-12

1992-01-21

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

2502016, 354403, G01C 300, G01C 500

Patent

active

050823639

ABSTRACT:
In a distance measuring apparatus for optically detecting a distance to an object by using a triangulation method, two signals which are obtained from a position sensitive device are added and it is detected that the result of the addition has exceeded a predetermined threshold level. On the other hand, it is assumed that a signal waveform to drive a light emitting device is a signal whose level increases with an elapse of time. When the addition result exceeds the threshold level, the level of the drive signal is held constant. At this time, by dividing a signal obtained from the position sensitive device by the signal indicative of the addition result, a signal relating to the distance to the object is obtained.

REFERENCES:
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patent: 4623237 (1986-11-01), Kaneda et al.
patent: 4642451 (1987-02-01), Tsunekawa et al.
patent: 4697904 (1987-10-01), Takahashi et al.
patent: 4723073 (1988-02-01), Amikura et al.
patent: 4935613 (1990-06-01), Ishiguro et al.
Patent Abstracts of Japan, vol. 9, No. 329 (P-416) [2052], Dec. 24, 1985, JP-A-60-154176.
Patent Abstracts of Japan, vol. 6, No. 116 (P-125), 29th Jun. 1982; & JP-A-57 44 809.

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