Exposure time controls for cameras
Abstract
Abstract AN ELECTRICAL SYSTEM FOR AUTOMATICALLY DETERMINING, IN CAMERAS, EXPOSURE TIME, PARTICULARLY UNDER LOW-LIGHT CONDITIONS. THE SYSTEM INCLUDES AN RC CIRCUIT MADE UP OF A PHOTOCONDUCTOR AND RAPACITOR CONNECTED IN SERIES, A TRIGGER CIRCUIT CONNECTED TO THE RC CIRCUIT TO BE TRIGGERED THEREBY WHEN A GIVEN TRIGGER LEVEL IS REACHED AND A STRUCTURE RESPONDING TO TRIGGERING OF THE TRIGGER CIRCUIT FOR INTIMATING AN EXPOSURE-TERMINATING OPERATION. THE PHOTOCONDUCTOR, THE CAPACITOR, AND THE TRIGGER CIRCUIT FORM THREE UNITS TO ANY ONE OF WHICH A COMPENSATING CIRCUIT IS ELECTRICALLY CONNECTED FOR THE PURPOSE OF AUTOMATICALLY INCREASING THE EXPOSURE TIME UNDER LOWLIGHT CONDITIONS, SO AS TO COMPENSATE IN THIS WAY FOR PHOTOGRAPHS WHICH ARE MADE WHEN RELATIVELY LITTLE LIGHT IS AVAILABLE.
Inventors
- 👤 T Nobusawa
Bibliographic Details
Claims Analysis
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