| 摘要 |
PROBLEM TO BE SOLVED: To provide a transformer having small size, light weight, is of low cost, where magnetic coupling between primary and secondary windings is strong and other components can be placed in the inside. SOLUTION: This transformer 50 of this loudspeaker includes a bobbin 52 fitted to a horn 32 of a piezoelectric loudspeaker 20. One end 34 of the horn 32 or the like is placed in a hollow part 25a of the bobbin 52. A primary winding 54 and a secondary winding 56 are wound on the bobbin 52. In this case, the secondary winding 56 is separated into two parts 56a and 56b. The part 56a of the secondary winding 56, the primary winding 54 and the part 56b of the secondary winding 56 are wound on the bobbin 52 is this order. Both ends of the primary winding 54 are connected respectively to two terminals 58a, 58b. Both ends of the secondary winding 56 are connected respectively to two input terminals 30a, 30b of the piezoelectric loudspeaker 20.
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