| 摘要 |
PURPOSE:To enlarge semi-vertical angle of a diaphragm to suppress sound lock effect and improve quality of sound by heighten high-pass threshold frequency by forming the reinforcing diaphragm wavy in sectional form making plural zigzag joints a bottom, and arranging these joints concentrically around the conical apex of a main diaphragm. CONSTITUTION:When a flat plate is made to three-dimensional by folding, a reinforcing diaphragm 1 in which sectional form in radial direction shows triangular wavy form with zigzag joining part 9 forming a bottom. Plural zigzag joints 9 are arranged concentrically and parallelograms 5A and 5B show ascending slope to crest fold line 3 from outermost joint 9 (outer end of the reinforcing diaphragm). Parallelogram 5C, 5D show descending slope to succeeding joint 9 from the crest fold line 3. A composite diaphragm 10 is formed by sticking the reinforcing diaphragm to the surface of the main diaphragm 6. These joints 9 are arranged concentrically around the apex of the cone of the main diaphragm 6. |
