| 摘要 |
PURPOSE:To decrease the higher harmonic distortion caused by the nonlinearity of the driving force of the speaker sound pressure, by forming the voice coil with plural number of conductors connected in parallel and at the same time decreasing the resistance value of each conductor less toward the edge part than the center part. CONSTITUTION:The voice coil in which voice coil part 11a is formed with print conductor 11 at coil bobbin 7 is provided within the magnetic circuit gap formed by magnet 3, plate magnetic pole 4, center pole 2 and yoke 1. For the voice coil of such structure, part 11a formed with conductor 11 is distributed on film 10 wound round the outer circumference of bobbin 7, and the width of conductor 11 is increased gradually from center part C toward common conductor parts 11b and 11b' at the edge part. At the same time, the resistance value of part 11a is decreased gradually from part C toward the edge part. As a result, the compensation is possible to the higher harmonic distortion caused by the nonlinearity of the driving force of the speaker sound pressure. |
