| 摘要 |
PURPOSE:To hold a position of a damper to a prescribed height by constituting a case main body of an electro-mechanical vibration transducer with a frame having a coil and a frame containing a yoke so as to couple the two frames and to make the fitting of a damper to the case main body easy. CONSTITUTION:The case main body 1 of the transducer is formed by the frames 2, 3 having dish shaped cross section, and frames 2, 3 are provided with flanges 4, 5 incorporatedly. An outer circumference 6a of a ring damper 6 having a vent hole made of an elastic member is clipped between the flanges 4, 5 of the frames 2, 3 and the damper 6 is prolonged into the frames 2, 3. An inner circumference 6b of the damper 6 is fixed to a step 13 of the yoke 8 having a magnet 10 contained in the case main body 1. An opening 14 is formed at the center of the frame 3, a cylindrical coil frame 15 fitted to a plate 15a is inserted to the opening 14 and the plate 15a is fixed incorporatedly to the flame 3. Then, the fitting of the damper 6 to the case main body 1 is made easy and the height is kept to a prescribed position. |
