Abstract: There is provided a position detector including a member having a surface and a plurality of vertically and horizontally arranged antennas; a controller for sequentially driving the vertically arranged antennas in vertical positive and vertical negative directions, and for sequentially driving the horizontally arranged antennas in horizontal positive and horizontal negative directions so that the antennas sequentially radiate radio waves; a receiver for receiving the sequentially radiated radio waves on the surface of the member; and a detector for detecting the position of the receiver on the surface of the member based on the levels of the received radio waves.

Abstract: A video game machine which functions as a simulator. The machine comprises a toy vehicle, a manual control unit permitting a human player to remotely control the vehicle, an optical sensor mounted integrally with the vehicle, and a control which controls the progress of a game according to information supplied from the sensor. The toy vehicle is held so as to be movable along the viewing screen of a television set. The sensor is disposed opposite to the TV screen and monitors the emission of light from the screen portion which is opposite to the sensor.