| 摘要 |
According to the present invention, means for preventing guide shafts from being extracted in an axial direction is configured by providing end face contact pieces formed by cutting and electing a chassis plate and contacting the end face contact pieces with end faces of the guide shafts. The guide shafts are held by hook-shaped shaft holding members formed by cutting and erecting the chassis plate, where the guide shafts are passed through cut-out portions of the shaft holding members. The end faces of adjusting screws threaded into screw holes from a lower surface of the chassis plate and protruding upward are broght in contact with the guide shafts. The adjusting screws prevent the guide shafts from being extracted through insertion openings, and adjust heights thereof. Thereby, holding and height adjustment of the guide shafts for the pickup unit are performed with a smaller number of parts, low cost, and ease. In addition, the guide shafts are prevented from being extracted even when a strong impact is applied.
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