Patent ID: 8638449
Filing Date: 2014-01-28
Classification: G01C,G01S

Abstract:
1. A measuring device, comprising a light source unit for projecting a pulsed distance measuring light toward an object to be measured, a projecting light optical system for projecting said pulsed distance measuring light emitted from said light source unit on said object to be measured, a light receiving optical system for receiving a reflected pulsed distance measuring light from said object to be measured, a light receiving part having a single photodetector for detecting said reflected pulsed distance measuring light as received, and a control unit for measuring a distance by measuring time from light emission of said pulsed distance measuring light to receipt of the reflected pulsed distance measuring light based on a detection signal from said photodetector, wherein said light source unit has a plurality of light emitting sources arranged in a known relation with respect to an optical axis of said projecting light optical system, and a driving unit for driving the light emitting sources at a predetermined time interval, wherein said projecting light optical system separately projects pulsed distance measuring lights from each of said light emitting sources, said light receiving part has a reduced optical system arranged at position conjugate to said light emitting source and used for separately receiving said reflected pulsed distance measuring lights and separately guiding said reflected pulsed distance measuring lights to said photodetector, and said control unit is designed to identify photodetection signals from said photodetector by matching with said light emitting source and to perform distance measurement for each photodetection signal.