Patent ID: 7354301
Filing Date: 2008-04-08
Classification: H01M,H02J,H02M,Y02E

Abstract:
1. A DC adapter which, in use, is connected to an AC/DC converter and is inserted into a battery housing portion of an electronic apparatus so as to supply the electronic apparatus with DC power, said DC adapter comprising: (a) a substantially cylindrical adapter main body which has an insertion limiting portion which is sized, shaped, and positioned (i) to be guided by an insertion guide portion of the battery housing portion when the DC adapter is inserted into the battery housing portion with the proper polarity and (ii) to come into contact with the insertion end side wall of the battery housing portion when the DC adapter is inserted into the battery housing portion with the reversed polarity so as to limit the insertion of the DC adapter; wherein (b) the insertion limiting portion (i) is formed by projecting a part of the outer circumference of the substantially cylindrical adapter main body in a rectangular manner along the longitudinal direction of the substantially cylindrical adapter main body and (ii) has two sides each of which extends from a part of the outer circumference of the DC adapter; (c) a center angle is obtained by connecting the proximal ends of the two sides on the outer circumference of the DC adapter; (d) the center angle is less than 90°; (e) the substantially cylindrical adapter main body is formed by arranging a plurality of cylindrical bodies in the direction perpendicular to the longitudinal direction; and (f) an electrode terminal is formed at the concave portion between the cylindrical bodies.