| 摘要 |
PURPOSE:To enhance the reliability and the mass productivity by elimination of pressure leaks by a method wherein the fitting part of the pressure introduction pipe of a sensor unit with the pressure introduction hole of a case is sealed with an O-ring, and further a member reinforcing the sealing function is provided. CONSTITUTION:The O-ring 4 seals the pressure introduction pipe 1a of the sensor unit 1 and the pressure introduction hole 5a of the case 5 made of e.g. resin, and leads the measured pressure to an Si diaphragm surface in the unit. Here, the reason why the pipe is not directly insert-fixed in the hole is that the mechanical stress applied from out-side is to be alleviated in this part so as not as to be transmitted to the unit. A sleeve 6 is inserted between a printed plate 3 over the ring and the case, and the gap between the sleeve and the plate is made much smaller than the diameter of the ring; thereby, preventing the pressure leak by inhibition of the levitation of the ring. |
