US Patent 7403631 Electro-acoustic transducer
Patent 7403631 was granted and assigned to Star Micronics on July, 2008 by the United States Patent and Trademark Office.
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The two coil spring terminals have the structure of double coil spring terminal including a small diameter coil spring terminal and a large diameter coil spring terminal. In this case, a terminal holder is provided with a clamping portion for clamping the large diameter coil spring terminal between the terminal holder and an internal circuit board. Specifically, the terminal holder is formed, in an upper end portion of its outer peripheral surface, with an annular groove which is adapted to be engaged with a small diameter portion formed in an upper end portion of the large diameter coil spring terminal. This omits fixation of the large diameter coil spring terminal to the internal circuit board, and necessity of soldering the two coil spring terminals respectively to the internal circuit board as a conventional art, enhancing mounting workability of the terminal holder.
US Patent 07403631 Electro-acoustic transducer US Patent 7403631 Electro-acoustic transducer
US Patent 07403631 Electro-acoustic transducer
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