| 摘要 |
<p>A jack device which does not malfunction because of overcurrent in an apparatus or a device that is connected to the jack device by preventing short-circuit between contacts in inserting a plug. The jack device, into which a single-head plug (50) having plug poles in the direction of insertion is inserted for connection, has a contact piece (11) that is arranged at the end of the plug (50) and brought into contact with a first plug pole (plug pole 54) and a contact piece (10) that is arranged neighboring the first plug pole and brought into contact with a second plug pole (plug pole 52). To widen the spacing between the two plug contact pieces (11), (10) in the direction of plug insertion, the spacing D between the plug connecting parts (11p), 10p) of both contact pieces (11), (10) is almost equal to or greater than the length L of the first plug pole (plug pole 54), so that when the first plug pole (plug pole 54) contacts with the inside contact piece (11), the contact piece (10) of the inlet side with the second plug pole (plug pole 52). <IMAGE></p> |
