已经到达上端的电镀液穿过管状电极的通孔循环。

The plating liquid having reached the upper end circulates through the through-hole of the tubular electrode.

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圆管状间隙（S1）在 放置在中空段内的管状电极与中空段的内周壁（14）之间形成，电镀液在该 间隙（S1）中流动。

A circular tube-like gap (S1) in which a plating liquid (17) flows is formed between the tubular electrode placed in the hollow section and an inner peripheral wall (14) of the hollow section.

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在一个实施例中电极发射源元件包括具有第一和第二开口端的管状金属体(107)。

In one embodiment an electrode emission source component comprises a tubular metal body (107) having first and second open ends.

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