Obstacle-detectable mobile robotic device

An obstacle-detectable mobile device, comprising:

• a frame body capable of traveling on a surface;
• a control circuit mounted to said frame body for controlling traveling manner and direction of said frame body and configured to avoid obstacles obstructing the mobile device;
• and
• a detection system mounted to said frame body and electrically connected with said control system, said detection system having an optical emitter, an optical receiver, and a reflector, said optical emitter emitting the light toward the surface at a given angle to define a projection area on the surface, said reflector facing said projection area, the light emitted to the projection area being reflected to said reflector to define a reflection area on said reflector, the reflection area being variably located on said reflector subject to a height that the surface is positioned, said optical receiver facing said reflector to define a receiving area on said reflector, the receiving area never overlapping the surface;
• wherein the reflection area is overlapped with said receiving area when said optical emitter is spaced from the surface at a given distance;
• wherein the reflection area is not overlapped with the receiving area when said optical emitter is farther than the given distance from the surface;
• wherein said optical receiver being enabled to receive the light from said optical emitter is dependent on whether or not the receiving area is overlapped with the reflection area;
• and wherein the detection system of the mobile device is configured to reject ambient light pollution and avoid misdetection of obstacles.