| 摘要 |
PURPOSE:To attain the random selection of desired types of sound recording contents by forming a sound recording groove with plural grooves having their leading parts at different positions of the inside and the outside in the radial direction of a recoding disk unit. CONSTITUTION:A stopper 23 for a pickup 13 is made of a rotary member which can change its position where the pickup 13 is supported at the inside and the outside in the radial direction of a recording disk unit 5. Furthermore the stopper 23 contains a frictional follower wheel 21 integrated coaxially with the stopper 23. This wheel 21 has a frictional contact with a stylus pressure releasing operation wheel 17. While a sound recording groove 2 contains a group of plural grooves having their leading parts at different positions of the inside and the outside in the radial direction of the unit 5. In such a constitution, the desired types of sound recording contents can be selected at random by means of a selection lever 20. Thus it is possible to obtain a simple and tasteful acoustic reproducer.
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