| 摘要 |
A banana plug comprising a core pole and copper outer tube, elastic outer copper hull which wrap subsection out of the core pole, wherein a mandril aperture is extending through the core pole in its longitudinal direction, an insulative sheath is attached to inner wall of the mandril aperture, and an inner-contact hollow copper pole with a deep hole or a through hole at tip, is inserted into the insulative sheath. The banana plug is configurated to the inner copper pole, outer tube which are insulative each other by means of improving structure inside of the core pole without changing outer shape and structure of the plug. It provides two contacts or an additional optical contact.
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