| 摘要 |
An automatic shutter timing mechanism includes a shutter opening release electromagnet controlled by a first solid state switch and a shutter closure release electromagnet controlled by a second solid state switch. A relaxation pulse output oscillator includes a unijunction transistor and a period control timing network comprising a light exposed photoconductor and one or more timing capacitors selectively connected in series with the photoconductor. The solid state switch inputs are coupled to the oscillator so that one pulse actuates the first switch and the second pulse actuates the second switch which is enabled by the actuation of the first switch. The solid state switch and electromagnets are energized by a common voltage source. |
