| 摘要 |
PURPOSE:To set a shutter aperture time optionally and automatically, by providing a timing circuit in the body provided with an operating switch, and providing a switching element short-circuited by the timing circuit, and a control member for optionally controlling an operation of the timer. CONSTITUTION:A cable release switch body 1 is provided with a setting dial 3 consisting of a switch 20 of a shutter aperture time setting circuit 14, and a handy push-switch 2, and supplies an electric signal through a release plug 5. When the dial 3 is moved from its off-position, an electric power supply switch 7 is closed, and a power supply battery 8 is supplied to the circuit. When the switch 20 is switched to contacts M, M', the manual operation is executed by pushing a handy push-switch 9 (2). In contacts (a), a', a transistor 23 is conducted through an NAND circuit 11, a capacitor (C) 12 and NOT circuits 13, 21, and by a charging time of C 12, the shutter opening operation is executed. The aperture time can be made long by switching from the contacts (a), a' to (e), e' in order. |
