| 摘要 |
An antenna device having a straight shaft extending from a mount member to be attached to an electronic device, and a cylinder member which comprises an antenna member and slidably fitted around the shaft in intimate contact therewith to define a generally airtight chamber by the outer end of the shaft and the inner surface of the cylinder member. The cylinder member is projectable outward along with the antenna member by an urging force when released from a lock member, the cylinder member being so projectable at a reduced speed by giving a negative pressure to the chamber.
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