| 摘要 |
A lens-fitted photo film unit has a pre-loaded cassette. A roll of unexposed photo film is drawn out of the cassette. After photography, an exposed portion of the photo film is wound into a cassette shell around a spool. A stopper level, inside the cassette shell, is swingable from a position of latching the spool immovably on the cassette shell, to a position of unlatching. A shutter plate, inside a photo film passage port in the cassette, closes to block ambient light from entering the passage port, and opens the passage port to allow photo film to pass. A bottom lid closes a cassette containing chamber. A lock slider is mounted in the bottom lid in order to lock and unlock the bottom lid on the chamber. The stopper lever is connected to the lock slider, and latches the spool while the bottom lid is unlocked, and leaves the spool unlatched while the lock slider locks the bottom lid. A rear lock bar on the bottom lid locks and unlocks the bottom lid. The rear lock bar is engaged with the shutter plate, and closes the shutter plate while the bottom lid is unlocked, and opens the shutter plate while the rear lock bar locks the bottom lid. A pointer is disposed on an end of the spool. An associated face of the cassette shell has four indicative areas, and are pointed by the pointer, to indicate one of four graded statuses of use of the photo film.
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