| 摘要 |
A drum for a music box comprises a plate having a number of pins on its outer surface and a number of holes in its backface. The plate is bent to form a cylinder. The pins and holes are arranged in a coaxial fashion with each other. Each of the pins has a substantially uniform diameter from its distal end to proximal end. A depth of the holes is smaller than a thickness of the plate and is greater than half the thickness of the plate and is greater than half the thickness of the plate. A diameter of the pins is smaller than the diameter of the holes and is greater than half the diameter of the holes. The drum is preferably formed through a fine blanking method. Thus, the drum is suitable for mass-production in low cost with a high performance.
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