Camera with film take-up confirming mechanism
May 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCamera with film thread indicating mechanism Photographic camera Camera having film feed indicator Motor driven film rewind device for camera Display device for a camera Film initialization reassuring mechanism End of film detection device Camera with film take-up confirming mechanism System for controlling film transport for camera Patent #: 4728976 InventorApplicationNo. 699081 filed on 05/13/1991US Classes:396/406, Having significant electronic circuit detail396/284, Film condition indicator396/395, Film movement limiting means396/512Film cassette or cartridgeExaminersPrimary: Gellner, Michael L.Assistant: Gray, David M. Attorney, Agent or FirmInternational ClassG03B 001/18AbstractIn a camera, a film presence sensing switch is located to detect the beginning of a full width main section of a filmstrip after a reduced width leading section of the filmstrip is wound at least partly onto a take-up spool. When a sufficient time has elapsed during the film winding operation for the reduced width section of the filmstrip to be wound onto the take-up spool, a motor drive for rotating the spool in a winding direction is de-energized should the switch fail to detect the beginning of the full width section of the filmstrip. Alternatively, the motor drive is allowed to remain energized to continue the film winding operation should the switch detect the beginning of the full width section. | |
