| 摘要 |
<p>PURPOSE:To avoid inconvenience in operation such as unexpected ejection of a tape pack at application of main power supply by providing a mechanism control circuit connected to two systems of power supplies between an operation switch and a mechanism. CONSTITUTION:The mechanism control circuit 3 sends a drive signal of each mode to a mechanism 2 according to the mode operation of the operation switch 1 at the normal mode and a backup circuit 4 is not actuated, then a switch means transistor (Tr) is kept cut off and the mechanism 2 is energized by an accessory power supply ACC only to attain the normal mode. Then in case of ejection, the mechanism control circuit sends a drive signal of ejection to the mechanism 2 and the backup circuit 4 is actuated to switch the switching means Tr. Thus, the power is applied to the mechanism 2 from a battery power BAT in addition to the accessory power ACC to apply ejection.</p> |
