| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker that transduces a stereo acoustic electric signal into a monaural acoustic signal without the need for a monaural output amplifier and for connection of two speakers. SOLUTION: The speaker SP has 4 input terminals, L+, L-, R+, R-terminals 1, 2, 3, 4. Ends of left sound electric signal wires 5 connect to the L+ terminal 1 and the L- terminal 2 respectively. Ends of right sound electric signal wires 6 connect to the R+ terminal 3 and the R- terminal 4 respectively. The left sound electric signal wires 5 and the right sound electric signal wires 6 are wound alternately in a cylindrical coil 7 of the speaker SP. The coil 7 is inserted to a permanent magnet 9 so that a projection in the middle of the permanent magnet 9 is penetrated to the coil 7. The permanent magnet 9 is formed cylindrically where one end is closed by a disk 9b with a cylindrical projection 9a in the middle. A diaphragm 8 is placed to the end of the coil 7 and emits sound in space through the vibration of the coil 7. |
