Patent ID: 7973942
Filing Date: 2011-07-05
Classification: B82Y,G01B,G01Q

Abstract:
1. An optical displacement detection mechanism comprising: a light source that irradiates a light to a measurement object, wherein the light source is a low coherent super luminescence diode (SLD), or a low coherent light emitting diode, a photodetector that receives the light after irradiated to the measurement object from the light source to thereby detect an intensity of the light and generate a detection signal which represents a deflection quantity of the measurement object, an amplifier that amplifies the detection signal of the photodetector at a predetermined amplification rate, and a light intensity controller that controls the light source to adjust the intensity of the light irradiated to the measurement object based on a condition of the measurement object, wherein the condition of the measurement object comprises shape, reflectivity, or mechanical characteristic of the measurement object, and wherein when a detection sensitivity of the optical displacement detection mechanism changes due to the condition of the measurement object, the light intensity controller optimizes the intensity of the light to compensate for the changed detection sensitivity.