Film sensitivity automatic introduction exposure information device

摘要

PURPOSE:To set automatically film sensitivity information by a simple circuit, by providing a light-sensitive part, a film sensitivity leading-in part, the first signal source, the second signal source, an operating means, etc. CONSTITUTION:As for a light-sensitive part 10, the conductance shows a linear characteristic with respect to an optical index LV of a photodetecting illuminance. Also, resistances 11a-11e provided in parallel to the light-sensitive part 10, and switches 12a-12e connected in series to each of these resistances form a sensitivity leading-in part of a film. Also, this leading-in part consists of plural resistance members determined successively from a conductance variation value DELTAnu of the sensitive part 10 and a pattern condition of a code of a film sensitivity marked on a film cartridge, and the first signal source is formed. Subsequently, resistances 13a-13d and a selecting switch 14 form the second signal source. Also, resistances 15a-15d and a selecting switch 16 form a correcting means, and a signal from the first signal source is corrected. A meter 17 is of differential type, and sets a difference in current sent from the first and the second sources as an indicating value of a needle.