Patent ID: 6490911
Filing Date: 2002-12-10
Classification: G01L,G01N

Abstract:
A sensor device, comprising:a base body having a vibrating portion; a piezoelectric element fixed onto one surface of said vibrating portion and having a piezoelectric film and a pair of electrodes which are in contact with said piezoelectric film; a space that allows a fluid to lead to the other surface of said vibrating portion; and introduction holes that communicate with said space; wherein said sensor device is in a longitudinal shape, and a recess which contains at least an opening end of the introduction holes on the surface side of the sensor device in its region and extends up to the rear end portion of the sensor device is formed on the surface of the sensor device by a protrusion disposed on the surface of said sensor device so as to extend substantially continuously from the periphery of said introduction holes to the rear end portion of said sensor device.