Patent ID: 6871019
Filing Date: 2005-03-22
Classification: G03B

Abstract:
1. A shutter abnormality detection apparatus for a camera comprising a shutter including leading and trailing curtains which are shutter curtains electrically controlled to run, the apparatus comprising: a curtain run detection unit which detects a run state of at least one of the leading and trailing curtains; a curtain run time judgment unit which judges a run time of the shutter curtains based on an output from the curtain run detection unit; and an abnormality processing unit which notifies an abnormality state of the shutter curtains, when it is judged as a result of judgment in the curtain run time judgment unit that the curtain run time is abnormal; wherein the said abnormality processing unit including an operation lock function which locks the subsequent operation of the camera, when the curtain run time is judged to be abnormal; and further comprising: a return unit which returns the operation of the camera from the locked state in response to a predetermined operation, when the subsequent operation of the camera is locked by the abnormality processing unit; a curtain run time recheck unit which again judges whether or not the run time of the shutter curtain is normal during the operation of return by the return unit; and a control unit which returns the operation of the camera to a normal operation, when the run time of the shutter curtain is judged to be normal as a result of judgment by the curtain run time recheck unit and which controls and locks the subsequent operation of the camera, when the run time of the shutter curtain is again judged to be abnormal.