초록 ▼

A scanning-type distance measurement device is responsive to selected signals to reduce interference due to stray light. An emitted beam of light is aimed to be reflected from an object and to a photodetector among a plurality of photodetectors which are positioned linearly or in two-dimensions. The

A scanning-type distance measurement device is responsive to selected signals to reduce interference due to stray light. An emitted beam of light is aimed to be reflected from an object and to a photodetector among a plurality of photodetectors which are positioned linearly or in two-dimensions. The outputs of the photodetectors are selected based on the position of the emitted beam of light, so that photodetectors which should not contribute to the reflected beam, based on the geometry of the emitted beam and the reflecting object, are ignored. This approach reduces the effects of stray noise from other light sources. The selection of the photodetectors is synchronized with a scanning light emitter generating the beam of light by a position signal and an angular signal so that the noise component in the output signal which is due to stray light can be kept to a minimum.

대표청구항 ▼

[ What is claimed is:] [1.] A scanning-type distance measurement device to measure distance to an object, comprising:a scanning light emitter to scan a beam of pulse light linearly;a scanning position sensing device to detect a scanning position of said beam of pulse light and to output a position s

[ What is claimed is:] [1.] A scanning-type distance measurement device to measure distance to an object, comprising:a scanning light emitter to scan a beam of pulse light linearly;a scanning position sensing device to detect a scanning position of said beam of pulse light and to output a position signal corresponding to the detected scanning position;a photodetector device having a plurality of photodetector elements to receive portions of said beam of pulse light which are reflected from said object, said photodetector elements each outputting a beam signal;a selective switch to select at least one of said photodetector elements and to output the beam signal corresponding to the selected at least one photodetector element; anda control device to receive the position signal from said scanning position sensing device and the beam signal from said selective switch and to calculate a distance between said scanning-type distance measurement device and said object.