Distance measuring device

Details Distance measuring device Distance measuring device

1979-08-23

1981-11-03

Gellner, Michael L.

354 31, G03B 310, G03B 7099

Patent

active

042982588

ABSTRACT:
A distance measuring device is disclosed which includes a light emitting diode for projecting a light beam and photoresponsive elements for receiving the reflected light beam from an object. The photoresponsive elements are coupled to a circuit for producing a signal indicative of the distance between the device and the object. A circuit is provided for generating a timing signal in relation to the phase of the alternative fluctuations in the intensity of the ambient light. The light emitting diode is so controlled as to be allowed to project light beam when the timing signal is produced. The timing signal is arranged to occur during periods of zero or minimal ambient light fluctuations so that the distance measuring device is immune to the ambient light fluctuations.

REFERENCES:
patent: 3442193 (1969-05-01), Pagel
patent: 3999192 (1976-12-01), Hosoe et al.

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