| 摘要 |
PURPOSE:To prevent other person's free use, by constituting so that a registered cipher is compared with an input cipher, and a camera can be operated when both the ciphers have coincided. CONSTITUTION:When a binary number of 4 digits is set to a shift register 4 by operating cipher input switches SW4, SW5, its value is displayed by light emission diodes D1-D4. This value is compared with a cipher registered in advance in a cipher setting means 8 by a digital comparator, and when a coincidence signal is outputted, a JK flip-flop 6 is set, and a transistor TR1 is turned on by a Q output. As a result, a camera controlling circuit 2 can be electrified. Power- on resetting circuit R7, D1 and C1 reset the shift register 4 and the flip-flop 6 when the electric power supply for comparing the ciphers has been turned on. |
