| 摘要 |
PURPOSE:To avoid occurrence of malfunction of a digital audio disk player by setting a cover at the close position when the player is used together with a shoulder belt, locking a lock release means for detection of a lock means and its operation and therefore invalidating the whole or a part of a switch group. CONSTITUTION:A cover 11 is never opened even if an open button 13 is pushed by mistake as long as a lock member 17 is pushed to the left to lock the button 13. Under such conditions, the contact of a detection switch 18 is closed and earthed and therefore the electric signal corresponding to a control switch is pushed out of a group 19 of those control switches is never sent to a control switch detecting circuit 20. Thus all control switches are invalidated even if the group 19 is pushed by mistake and no action is carried out in response to those control switches. As a result, no malfunction occurs even in case the group 19 or the button 13 touches inadvertently the clothes of a user, etc., when the disk player is used together with a shoulder belt.
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