| 摘要 |
A multipolar single-head plug can reliably encourage maintenance of the properties of insulation between electrodes and prevention of a short-circuit between electrodes even if the multipolar single-head plug has a large number of poles. A multipolar single-head plug (1) comprises: a bar electrode (2) exposed at a tip thereof; tubular electrodes (3a to 3d) concentrically arranged on an outer circumference of the bar electrode (2) and exposed at the outer circumference on a side closer to a root than the exposed part of the bar electrode (2) at the tip; and an insulator (4) composed of an insulating part (41a) between the bar electrode (2) and the tubular electrode (3a), and insulating parts (41b to 41d) between the tubular electrodes (3a and 3b), between the tubular electrodes (3b and 3c), and between the tubular electrodes (3c and 3d). The multipolar single-head plug (1) is integrated with an insulating resin for insert molding that forms part of the insulator (4). A middle section of at least one of the insulating parts is provided with an insulating material such as an electrodeposition coating part (412b or 412c) or an insulating tube (414b or 414c) separate from the insulating resin for insert molding. The separate insulating material is provided so as to cover a given area of the outer circumference of the bar electrode (2) or a given area of an outer circumference of the tubular electrode (3a or 3b). |
