| 摘要 |
<p>The indicator contains a photosensitive signal generator, a flip-flop stage, and an indicating symbol visible in the view finder. A flash unit, used with the camera, has flash lamps with high ohmic resistance prior to ignition, as compared with that after ignition. The indicator records the flash readiness. The flash unit is connected to the photosensitive signal generator by a switch closed at least in the indication phase. After the flash unit has been ignited the indicating symbol, visible in the viewfinder and signalling insufficient light conditions, is switched on, If the flash lamps are ignited by a piezoelectric block, the switch is open during the prepn. of the impacting of the piezoelectric block.</p> |
