| 摘要 |
A locking groove 21 extending in the horizontal direction is formed approximately at the center of a front surface of a cartridge 20. A power switch 121 is turned on/off in response to an operation of a slide switch 122. When the power switch 121 is turned on by the slide switch 122, a lock plate 17 rotates in response to the operation of the slide switch 122. At this time, a projecting portion 171 provided on one side of the lock plate 17 is fit in the locking groove 21. Consequently, simultaneously with the turning on/off the power, the cartridge 20 is locked so as not to be ejected. <IMAGE> |
