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US 5,510,867 AGranted
Camera preventing loading of exposed cartridge
AssigneeNikon Corporation
InventorTsutomu Wakabayashi
Life of this patent
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AssigneeNikon Corporation
InventorTsutomu Wakabayashi
Estimating the term…
A camera includes a cartridge chamber for holding a film cartridge having a film usage indicator. An ejection member can eject the loaded cartridge from the cartridge chamber by at least a fixed amount. A loading prevention member projects and retracts from the cartridge chamber and when projecting prevents loading of a film cartridge with used film, stopping the film cartridge a first fixed amount from its fully loaded position. The loading prevention member retracts from the cartridge chamber to allow loading when a film cartridge with new film is loaded and returns to the projected position when the loaded cartridge is ejected a fixed amount. In a refinement, an operation completion detection switch cooperates with a cartridge chamber lid switch to help prevent double exposures by preventing feeding of film until the film cartridge has been ejected a second fixed distance from the fully loaded position.
A camera for use with a film cartridge having a film usage indicator movable from a position indicating all of the film in the film cartridge is unexposed to at least one position indicating exposure of at least some of the film in the film cartridge, said camera comprising:
A camera for use with a film cartridge having a film usage indicator movable from a position indicating all of the film in the film cartridge is unexposed to at least one position indicating exposure of at least some of the film in the film cartridge, said camera comprising:
A method of operating a camera designed for use with a film cartridge having a film usage indicator movable from a position indicating all of the film in the film cartridge is unexposed to at least one position indicating exposure of at least some of the film in the film cartridge, said camera including a cartridge chamber for holding the film cartridge in a fully loaded position, a loading prevention member that prevents loading of the film cartridge with exposed film to the fully loaded position by movement of said loading prevention member to a first position projecting into said cartridge chamber and that allows loading of the film cartridge with unexposed film to the fully loaded position by movement of said loading prevention member to a second position not projecting into said cartridge chamber, said loading prevention member in said first position stopping a film cartridge being loaded at a first fixed distance from the fully loaded position, said method comprising the following steps:
Dependencies are inferred from the claim text.