Optical object positioning apparatus and positioning method thereof

An optical object positioning apparatus including an optical element, a light sensor, and a processing unit and a positioning method thereof are provided. The optical element includes a first surface and a second surface opposite to each other and perpendicular to a first axis, and has at least two light-transmitting regions. A light from an object passes through the light-transmitting regions from the first surface to the second surface. A distance between the light sensor and the optical element in a direction of the first axis is a predetermined distance. The light sensor senses the light from the light-transmitting regions to correspondingly generate at least two sensor signals. A correlation between a distance from the object to the optical element and the predetermined distance is positive. The processing unit receives the sensor signals and positions the object according to the sensor signals and the predetermined distance.An optical object positioning method is also provided.