| 摘要 |
PURPOSE:To reduce errors of detection by providing a means of detecting some of information units from plural units provided on a roll film in a feed direction simultaneously. CONSTITUTION:When a camera back is closed with the film 1 loaded, a switch 9 is turned on and a switch 123 is associated with it to clear a storage circuit 128. A film advance lever 10 is operated to make blank exposures of the film 1 and when the 1st information hole 4a is positioned between a light emitting part 64d and a photodetecting part 115d, a switch 116 is turned on to perform light emission, but a control circuit 127 inputs a signal from the photodetecting part 115a through a terminal (e) only when the photodetecting part 115a receives the light from the light emitting part 64a (in the presence of the information hole 4a). Consequently, a signal is generated at a terminal (x) and the information of a decoder 126 is stored in the storage circuit 128. Then, the control circuit 127 inhibits the stored information from being updated. |
