| 摘要 |
A photographic camera has a motorized film transport mechanism which is operable normally to prewind substantially the entire length of a filmstrip from a light-tight cartridge onto a take-up spool without exposing any of the frames on the filmstrip and to rewind the filmstrip one frame at a time back into the cartridge after each exposure is completed. If a rear door of the camera is accidentally or inadvertently opened before the filmstrip is completely wound off the take-up spool, the exposed frames within the cartridge are protected from stray light. However, the film remaining on the take-up spool may be ruined. Therefore, a door-open sensor and a film-on-spool sensor are provided which cooperate with a control circuit, when the rear door is opened, to operate the motorized film transport mechanism to continuously rewind the film on the take-up spool into the cartridge.
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