초록 ▼

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 betwe

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.

대표청구항 ▼

A distance measuring device comprising, in combination: means for projecting a pulsed light beam; means for receiving the light beam reflected from an object to be measured, said light beam receiving means obtaining information of the zonal distance between the distance measuring device and the obje

A distance measuring device comprising, in combination: means for projecting a pulsed light beam; means for receiving the light beam reflected from an object to be measured, said light beam receiving means obtaining information of the zonal distance between the distance measuring device and the object to be measured by utilizing the difference in the incident angle of the reflected light beam; means for receiving ambient light and for generating a signal indicative of the change in brightness of the ambient light; means connected to the ambient light receiving means for detecting the moment when the rate of change in brightness of the ambient light is relatively slow, and for generating a timing signal in dependence thereon, said detecting means operatively connected to the light beam projecting means for allowing the projecting means to project the light beam simultaneous with the reception of the timing signal.