| 摘要 |
PURPOSE:To improve the tone quality by providing a partitioning plate which divides the inside of a sound box with a speaker as the center and providing an inflow port and an outflow port in each divided air chamber to concentrate an air current on the position just behind the rear face of the speaker projected to the partitioning plate. CONSTITUTION:A partitioning plate 5 which divides the inside of a sound box 4 is provided, and the part behind the speaker is used as the passage of an air current 6, and an inflow port 7 is provided in one of two divided air chambers, and an outflow port 8 is provided in the other. Or partitioning plates 5 crossing in longitudinal and transverse directions are provided with the speaker as the center to divide the inside of the sound box into four and four ports are provided to constitute lead valves turned to the same direction in symmetrical directions 7-7 and 8-8, and thereby, the air current flows to symmetrical faces of a speaker diaphragm in the same direction and an unequal force is not given to a damper and the edge functioning as a diaphragm supporting part. Thus, the tone quality is improved.
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