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US 4,678,306 AGranted
Film feeding indication device for camera
AssigneeCanon Kabushiki Kaisha
InventorMasayoshi Kiuchi
Life of this patent
Estimating the term…
Abstract
A film feeding indication device of the type in which as a number of pulses, proportional to the distance the film has advanced, are formed, when the produced pulse number reaches a prescribed value, an indication representing the completion of film feeding is presented. The indication device, despite the produced pulse number becomes unable to reach the aforesaid prescribed value, forcibly presents that indication provided that a particular minimum value is reached.
Claims6
A film feeding indication device for a camera, comprising:
- (a) monitor signal forming means for forming a monitor signal corresponding to the film feeding;
- (b) detection means for generating an output when the signal of said monitor signal forming means reaches a predetermined value indicating a normal film feeding;
- (c) indication means for instructing completion of the film feeding in response to the output of said detection means;
- and
- (d) control means for causing said indication means to instruct completion of the film feeding irrespective of the output of the detection means when the film feeding by said film feeding means has been completed before the signal of said monitor signal forming means reaches the predetermined value.
2 more elements
A film feeding indication device for a camera, comprising:
- (a) switch means which repeats on and off operations in response to the film feeding;
- (b) detection means for generating an output by detecting the on and off operations of said switch means when the on and off operations are effected a predetermined number of times indicating completion of normal film feeding;
- (c) indication means for instructing completion of the film feeding in response to the output of said detection means;
- and
- (d) control means for causing said indication means to instruct completion of the film feeding irrespective of the output of said detection means when the film feeding by said film feeding means is completed while the on and off operations are repeated a half or more of the predetermined number.
2 more elements
Dependencies are inferred from the claim text.