Patent ID: 8531651

Claim:
A distance measuring device, comprising: an illumination unit operable to illuminate a target for distance measurement with multiple modulated light that is intensity-modulated using a multiplex modulation signal generated by multiplexing N different frequencies f n , where N is an integer equal to or greater than 2, and 1≦n≦N, the frequencies f n satisfying a relationship in which f n+1 =2k n *f n , where n and k n are natural numbers, and k n is a constant indicating the relationship between the frequencies f n and f n+1 ; a light receiving unit operable to receive reflected light of the illuminating multiple modulated light from the distance measurement target, and obtain charge corresponding to an amount of the received light; a distribution unit operable to output the charge obtained by the light receiving unit to a predetermined output destination at a predetermined timing; an accumulation unit operable to accumulate the charge output from the distribution unit; and a distance calculation unit operable to calculate a distance to the distance measurement target based on an amount of charge accumulated by the accumulation unit.