| 摘要 |
A head drum assembly for use in a video cassette recorder includes a rotary drum having a through hole and a threaded hole, a video head composed of a head chip for recording/reproducing signals on a magnetic tape, and a base plate divided into a fixed portion and a mounting portion for mounting the head chip, wherein the fixed portion of the base plate is formed with an aperture corresponding to the threaded hole of the rotary drum in such a way that the video head is installed on a lower surface of the rotary drum by engaging a fastening screw therethrough, and is formed with a slot, and a deformable member inserted into the slot in such a way that, when the deformable member is impinged by a laser beam, the head chip mounting portion of the base plate moves downwardly by a volume expansion of the deformable member.
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