Patent ID: 6924475
Filing Date: 2005-08-02
Classification: G01D,H04R

Abstract:
1. An optical transducer, comprising: a light source mounted on a base member; a light detector mounted on said base member spaced laterally of the light source; a deformable membrane overlying said light source and light detector and effective to reflect light from said light source to said light detector in accordance with the deformations of said membrane; and a light transparent body between said light source and light detector on one side and said membrane on the opposite side, said light transparent body being effective to direct light emanating from the light source to the membrane and to direct light reflected from the membrane to the light detector in accordance with the deformations of the membrane; characterized in that: said light source and light detector are enclosed in a first casing closed at one end by said base member and open at the opposite end; said membrane is carried at one end of a second casing and closing said one end of the second casing; said second casing further carries said light transparent body inwardly of said membrane at said one end and is open at the opposite end; said first and second casings are attached to each other with their open ends facing each other such that the light transparent body of the second casing overlies the light source and light detector of the first casing to direct light emanating from said light source to the membrane, and to direct light reflected from the membrane to the light detector; and said first easing is formed with an external annular flange receiving fasteners for securing the first casing to said base member.