| 摘要 |
<p>PURPOSE: To automatically prevent an exposed film from being loaded by operating visual display at the time of loading a film cartridge in a camera. CONSTITUTION: A film cartridge 30 includes plural terminals 40 on the outside surface electrically connected with one or more resistance elements 38. Those terminals 40 are matched and electrically connected with terminals in a cartridge housing chamber at a camera side. One or more thermo-sensitive visual indicator element 42 is adhered to the different resistance element 38. Those visual indicator element is preferably formed of a material whose visual characteristics are changed according to the increase of heat emitted from the resistance element provided at the lower side when the resistance value of the resistance element is changed. As the visual display method, a configuration in which the color of the material is changed from, for example, an absolute color to a red color is attained.</p> |
