| 摘要 |
PURPOSE:To prevent magnetic disturbance to other equipment by providing a damper metallic fixture made of a magnetic material with high magnetic permeability to the entire or part of the periphery of the damper sticking part of an iron-made frame, and converging lines of magnetic force extending to before a diaphragm. CONSTITUTION:The outer periphery of the damper metallic fixture 13 is allowed to contact the iron-made frame 5 of a speaker, and a damper 8 is clamped between the frame 5 and damper metallic presser 13 at the damper sticking part 5a. The damper metallic pressure 13 is formed of a material with high magnetic permeability such as an iron plate, silicon steel plate, and 'Permalloy(R)'. Magnetic flux from the iron-made frame is converged to form a return path to a plate 4. Consequently, leak magnetic flux to the front surface of the speaker is reduced to prevent magnetic distrubance to other electronic equipment. |
