Patent ID: 8319171
Filing Date: 2012-11-27
Classification: G01S,G01V,G05B

Abstract:
1. An optical scanning type photoelectric switch, which performs two-dimensional scanning with light to detect an object, and also measures a distance to the object to sense a two-dimensional position of the object, the switch having inside thereof: a light projection path along which light emitted by a light projecting element is projected toward a measurement area through a trochoid first scanning mirror; a light reception path along which reflected light reflected by the object is guided to a light receiving element through a second scanning mirror and received by the light receiving element; a reference object provided on the opposite side to the measurement area, a storage device for storing reference light reception signal information, which is obtained at the time of projecting light to the reference object, when the detection sensitivity of the optical scanning type photoelectric switch is adjusted to the optimum; and a detection sensitivity adjusting device capable of adjusting the detection sensitivity of the optical scanning type photoelectric switch, wherein the light projection path from the light projecting element to the first scanning mirror and the light reception path from the second scanning mirror to the light receiving element are shared so that light projected to the reference object and reflected by the reference object is received by the light receiving element, and wherein the detection sensitivity of the optical scanning type photoelectric switch is adjusted by the detection sensitivity adjusting device based upon actual light reception signal information, which is obtained at the time of projecting light to the reference object, and the reference light reception signal information.