| 摘要 |
<p>A driver for a transducer with two magnets, two magnetic gaps and two coils, a driver magnetic circuit thereof consisting of a base (381), an inner magnetic core installed at a central axis portion of a round platform (3118) in the base, and an outer magnetic core surrounding the inner magnetic core and installed coaxially therewith. The outer magnetic core is fixed or bonded in position by a vertical positioning face and a horizontal positioning face inside a cylindrical wall of the base cooperatively. The inner and outer magnetic cores are joined into a whole respectively by one or more than one permanent magnets (302A, 302B) magnetised in the axial direction and upper and lower electrode plates (303A1, 303B1, 303A2, 303B2) which are coaxial and have the same diameter. The permanent magnets of the inner and outer magnetic cores have opposite polarity at the axial height. A horizontal symmetric axis Z-Z axis lies at half of the axial height of the electrode plate of the inner magnetic core, the electrode plate of the outer magnetic core and the coil reel matched therewith. A horizontal symmetric axis W-W axis lies at half of the axial height of the permanent magnets of the inner and outer magnetic cores. With the centre axis Y-Y axis of the inner and outer magnetic cores as the vertical symmetric axis and W-W axis as the horizontal symmetric axis, with the technical requirements for e.g. the wrapping direction of the coils (309A, 309B) specified at the same time, a highly efficient driver for an electro-acoustic or electro-mechanical transducer having a symmetric magnetic circuit and symmetric coil circuit while having a resistive or quasi-resistive loading property and capable of eliminating counter emf is thus constructed.</p> |
