SPATIAL INFORMATION DETECTION DEVICE

摘要

The spatial information detection device generates a modulation signal defined as a square wave signal having high and low level periods appearing alternately, each of the high and low level periods having its length randomly selected from integral multiples of a predetermined unit time period. The spatial information detection device emits to a space including an intended area signal light defined as light modulated with the modulation signal. The spatial information detection device generates a demodulation signal defined as a signal having the same waveform as that of the modulation signal or that of a signal obtained by inversion of the modulation signal. The spatial information detection device generates signal electric charges by accumulating electric charges generated in response to light from the space in a collection time period determined by the demodulation signal. The spatial information detection device generates correction information regarding an effect caused by light from an unintended area between the intended area and the spatial information detection device. The spatial information detection device corrects by use of the correction information the amount of the signal electric charges as an amount of intended electric charges corresponding to electric charges which the light receiving unit produces in response to light from the intended area, and generates spatial information based on the amount of the intended electric charges.