| 摘要 |
An automatic flash triggering device comprising first and second armature levers that are actuated by an electromagnet connected to the output trigger circuit of a Schmitt circuit which energizes the electromagnet when the brightness of light incident upon a CdS element is below a predetermined level. The first lever controls the camera shutter mechanism and the second turns on a warning lamp and switches the mechanism to a predetermined low shutter speed if a flash bulb is mounted in place. The second lever will not function when the brightness of incident light is higher than a predetermined level while the first lever is actuated. When the brightness is less than a predetermined level, both the first and second levers are actuated the latter operating a suitable mechanism such that the shutter opens at a predetermined slow shutter speed and the flash is fired for proper exposure.
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