| 摘要 |
THE PRESENT INVENTION PROVIDES A DC ADAPTER (3) CAPABLE OF PREVENTING WRONG INSERTION OF DC ADAPTER, PREVENTING PRIMARY OR SECONDARY BATTERY FROM RATTLING WITHIN A BATTERY HOUSING PORTION (20) INTO WHICH IT IS INSERTED. THE DC ADAPTER (3) IS CONNECTED TO AN AC/DC CONVERTER AND IS INSERTED INTO A BATTERY HOUSING PORTION (20) OF AN ELECTRONIC APPARATUS SO AS TO SUPPLY THE ELECTRONIC APPARATUS WITH A DC POWER, WHEREIN A SUBSTANTIALLY CYLINDRICAL ADAPTER MAIN BODY (31) HAS AN INSERTION LIMITING PORTION (41) WHICH IS GUIDED BY AN INSERTION GUIDE PORTION (57) OF THE BATTERY HOUSING PORTION (20) WHEN THE DC ADAPTER (3) IS INSERTED INTO THE BATTERY HOUSING PORTION (20) WITH THE PROPER POLARITY, AND COMES INTO CONTACT WITH THE INSERTION END SIDE WALL OF THE BATTERY HOUSING PORTION (20) WHEN THE DC ADAPTER (3) IS INSERTED INTO THE BATTERY HOUSING PORTION (20) WITH THE REVERSED POLARITY SO AS TO LIMIT THE INSERTION OF THE DC ADAPTER, AND THE INSERTION LIMITING PORTION (41) BEING FORMED BY PROJECTING A PART OF THE OUTER CIRCUMFERENCE OF THE CYLINDRICAL MAIN BODY (31) IN A RECTANGULAR MANNER ALONG THE LONGITUDINAL DIRECTION OF THE MAIN BODY (31) AND HAVING TWO SIDES EACH OF WHICH EXTENDS FROM A PART OF THE OUTER CIRCUMFERENCE OF THE DC ADAPTER, WHEREIN THE CENTER ANGLE OF THE CIRCULAR ARC OBTAINED BY CONNECTING THE PROXIMAL ENDS OF THE TWO SIDES ON THE OUTER CIRCUMFERENCE OF THE DC ADAPTER (3) IS LESS THAN 91°. |
