Patent ID: 7045768
Filing Date: 2006-05-16
Classification: G01D,G01H,H04R

Abstract:
1. A displacement/light-quantity converter, comprising: a diaphragm; and a light emitting part and a light receiving part opposed to the diaphragm, said light receiving part receiving light emitted from said light emitting part and reflected off said diaphragm, and a vibrational displacement of said diaphragm being converted into a variation of Quantity of light received by said light receiving part, wherein said diaphragm has a concave surface, and the concave surface is opposed to said light emitting part and said light receiving part, and wherein the concave surface of said diaphragm is a rotational curved surface that is formed by rotating a curve 360 degrees about a central axis, which passes through a central point between said light emitting part and said light receiving part and is perpendicular to said diaphragm.