| 摘要 |
By providing dummy on projections 61a' to 61d' to cause dummy on status of the switches 62a to 62d at particular positions on the movale contact member pressure projections 61a and 61d in the rotor section 57 which turns on and off a plurality of switches 62a to 62d of the piano-touch type switch corresponding to the operation mode of the VTR, an operation mode detection device 56 which can clean the switch contact surfaces 62a'' to 62d'' by dummy on operation of the switches 62a to 62d using the dummy on projections 61a' to 61d' when the VTR proceeds from the standby status or the PLAY/REC mode to a next operation mode can be achieved. Thus, even when the piano-touch type switch is used for operation mode detection of the VTR, the switch contact members in the switches 62a to 62d are protected from reaction with substances in the air during the VTR is in standby status. This solves the problem of generating errors in operation mode detection and control resulting from noises generated during ON/OFF operation of the switches 62a to 62d due to sulfurization, oxidation or dust contamination caused by such reaction.
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