Patent ID: 8514375

Claim:
A distance-measuring device of measuring distance according to variation of imaging location, the distance-measuring device having a lighting component, a first lens, and an image sensor, the lighting component utilized for emitting a detecting light to a measured object for the measured object generating a reflecting light, the first lens utilized for focusing a background light or the reflecting light, the image sensor utilized for sensing an energy of a light focused by the first lens so as to generate M light-sensed signals, the distance-measuring device comprising: a lighting/sensing controlling circuit, for controlling the lighting component to emit the detecting light and controlling the image sensor to sense the energy of the light focused by the first lens during a distance-sensing phase, so that the image sensor generates M first light-sensed signals, and for controlling the lighting component not to emit the detecting light and controlling the image sensor to sense the energy of the light focused by the first lens during a noise-sensing phase, so that the image sensor generates M second light-sensed signals; wherein M represents a positive integer; and a distance-calculating circuit, for determining an imaging location of the reflecting light on the image sensor according to the M first light-sensed signals and the M second light-sensed signals, and calculating a measured distance between the distance-measuring device and the measured object according to the imaging location, a focus length of the first lens, and a predetermined distance between the lighting component and the image sensor; wherein the lighting/sensing controlling circuit controls the lighting component to emit the detecting light to the measured object by generating a lighting pulse signal, so that the measured object generates the reflecting light; the lighting/sensing controlling circuit controls the image sensor to sense the energy of the light focused by the first lens by generating a shutter pulse signal, so that the image sensor generates the M light-sensed signals; the lighting/sensing controlling circuit controls the image sensor to output the M light-sensed signals to the distance-calculating circuit by generating a reading signal; the lighting/sensing controlling circuit controls the distance-calculating circuit to receive the M light-sensed signals by generating a phase signal, for the distance-calculating circuit determining the image location of the reflecting light on the image sensor, and calculating the measured distance between the distance-measuring device and the measured object according to the imaging location, the focus length of the first lens, and the predetermined distance between the lighting component and the image sensor.