| 摘要 |
The electronic shutter device of this invention has a circuit for generating a voltage whose value is proportional to a logarithm of a magnitude of the current generated by a photosensitive element for sensing the intensity of the light from an object. It is so designed that said voltage generating circuit is used also for a circuit for controlling a shutter speed by the antilogarithmic transformation. Thus the variation in temperature and aging chracteristics, which are inherent if the separate circuits were provided, of a logarithmic transformation component can be corrected automatically. Further, an element adopted to store therein the intensity of light from the object is placed in the logarithmic transformation circuit.
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