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US 4,304,480 AGranted
Motor drive camera with synchronization system
AssigneeCanon Kabushiki Kaisha
InventorsHidehiko Fukahori, Yukio Mashimo, Tomonori Iwashita
Life of this patent
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Abstract
A film advance error detection system for synchronizing the operation of shutter cocking and film winding mechanisms with a motor drive unit therefor. This system utilizes three transducers positioned adjacent the sprocket wheel, film perforations and rewinding spindle to pick up signals whose frequencies are related to their speeds. By processing the signals in combination with an output signal of a phase difference compensator, it is made possible to provide, in a selective manner, a display representative of the film advane error and reeling end in the winding and rewinding operations along with the automatic stoppage of rotation of the motor.
Claims17
A film automatic winding up and rewinding device comprising:
- (a) a drive source, said drive source having an electric motor for film drive;
- (b) control circuit means, said means being operatively coupled to said film drive source to enable conversion of said drive source from an operative state to an inoperative state;
- (c) a film winding up mechanism, said mechanism acting in cooperation with said electric motor;
- (d) a film rewinding mechanism, said mechanism acting in cooperation with said electric motor in a motion transmitting relation when in a rewinding mode;
- (e) drive state detecting means, said means having a first detecting means arranged to detect a drive state of at least one portion of said film winding up mechanism and capable of producing an electrical signal corresponding to the detected state, and a second detecting means arranged to detect a drive state of at least one portion of said film rewinding mechanism and capable of producing an electrical signal corresponding to the detected state;
- (f) film motion detecting means, said means being capable of operatively detecting movement of a film itself to produce a second electrical signal as the detection output;
- (g) discriminating circuit means coupled to said drive state detecting means and film motion detecting means for forming a control signal based on at least one of said electrical signals, said discriminating circuit means being coupled to said control circuit means upon occurrence of an abnormal state in the film winding mode or in the film rewinding mode to automatically stop said drive source by said control signal;
- and
- (h) indicating means connected to the discriminating means for indicating a normal or an abnormal film winding or rewinding condition in response to the control signal, the indicating means having a plurality of indicating members, one of which indicating the normal condition when the rewind operation is completed and another indicating the abnormal condition when the rewind operation is interrupted or the rewind operation is not started.
6 more elements
A motor drive unit usable with a camera having a detecting device for detecting movement of a film to produce a detection signal, said unit having:
- (a) a housing;
- (b) an electric motor incorporated in said housing;
- (c) a winding up mechanism for being coupled to said electric motor in motion transmitting relation;
- (d) rewinding operating means, said means being provided outside of said housing to be operable for mode changeover;
- (e) a rewinding mechanism, said mechanism being constructed in operatively couplable relation to said rewinding operation means to be coupled in motion transmitting relation to said motor when in the rewinding mode, and said mechanism having a rewinding connection means arranged in a connection plane between the housing and said camera to be coupled with the camera side for motion transmission;
- (f) drive state detecting means, said means being a detection element for forming an electrical signal corresponding to a drive state of at least one portion of said rewinding mechanism;
- (g) signal terminating means, said means having connection terminals on said housing to receive the film motion detection signal from the camera side;
- (h) discriminating circuit means, said means being coupled to said drive state detecting means and signal terminal means for forming a control signal when an abnormal rewinding state corresponding to at least one of the signals occurs;
- (i) control circuit means, said means being operatively coupled to said motor and to said discriminating circuit means, so that the motor drive is stopped by its control signal;
- and
- (j) indicating means connected to the discriminating means for indicating a normal or an abnormal film winding or rewinding condition in response to the control signal, the indicating means having a plurality of indicating members, one of which indicating the normal condition when the rewind operation is completed and another indicating the abnormal condition when the rewind operation is interrupted or the rewind operation is not started.
8 more elements
A film drive device for a photographic apparatus having a film winding up mechanism, a film moving area through which film is wound, the area being arranged to be invisible from the apparatus, and film movement detection means positioned at the moving area for detecting the movement of the film at the area and producing a detection signal, the drive device comprising:
- (a) a film drive source, the drive source having an electric motor;
- (b) control circuit means, the circuit means being operatively coupled to said motor to control;
- (c) a film drive mechanism drivingly coupled to said drive source, the mechanism being operatively connected to the winding up mechanism;
- (d) detecting means for detecting the operating state of at least one portion of the drive mechanism and producing a state-related signal;
- (e) discriminating circuit means operatively connected to the detecting means and the film movement detection means for producing at least two control signals based on at least one of the detection signal and the state-related signal upon occurrence of an abnormal condition or normal winding up completion condition of the film movement or the drive mechanism;
- (f) indicating means connected to the discriminating circuit means for indicating the abnormal condition, the indicating means having a plurality of indicating elements, one of which indicating one type of abnormal film winding condition and another of which indicating other types of abnormal conditions;
- (g) said indicating means responsive to one of said control signals for selectively indicating the abnormal condition or indicating the normal condition by one of the control signals;
- and
- (h) said detection means sensing a perforated portion and non-perforated portion of the film so that the movement of the film is detected when the film is moved.
6 more elements
An automatic rewinding device for a photographic apparatus having a film patrone loading chamber in which the film patrone is loaded and from which photosensitive film is wound and thereafter the wound film is rewound in the patrone and an invisible film moving area through which the photosensitive film is wound and rewound, the device comprising:
- (a) a film drive source;
- (b) control circuit means operatively connected to the drive source;
- (c) a film rewinding mechanism, the mechanism operatively coupled to the drive source in motion transmitting relation, so that the wound film can be rewound;
- (d) film motion detecting means for detecting the rewinding movement state and forming a first electrical signal, the detecting means being positioned at the moving area predeterminedly spaced from the loading chamber;
- (e) drive state detecting means operatively coupled to a portion of the rewinding mechanism for forming a second signal in response to the operating or non-operating state;
- (f) discriminating circuit means connected to both detecting means for forming a control signal based on the first signal and second signal, the circuit means being operatively connected to the control circuit means to automatically interrupt film rewinding, so that the leading edge of the film is positioned between the entrance of the film patrone and the film motion detecting means at the rewinding interruption;
- and
- (g) indicating means, connected to the discriminating circuit means, for indicating an abnormal or a normal film winding condition, the indicating means having a plurality of indicating members, one of which indicating the normal condition when the rewind operation is completed and another indicating the abnormal condition when the rewind operation is interrupted or the rewind operation is not started.
5 more elements
A film drive device for a photographic apparatus having a film winding up mechanism, a film moving area through which the film is wound, the area being arranged to be invisible from the apparatus, and film detection means positioned at the moving area for producing a detection signal in response to the stoppage of the film, the drive device comprising:
- (a) a housing detachably mountable on the photographic apparatus;
- (b) a drive source, said source having an electric motor;
- (c) control circuit means operatively connected to the motor to control supply of power to the motor;
- (d) a film drive mechanism drivingly coupled to the drive source and couplable to the film winding up mechanism;
- (e) signal terminal means having at least one connection terminal on the housing to receive the detection signal;
- (f) state detecting means for detecting the operating and non-operating state of at least one portion of the drive mechanism and producing a state-related signal;
- (g) discriminating circuit means connected to the signal terminal means and the state detecting means for producing at least two control signals based on at least one of the detection signal and the state-related signal upon occurrence of an abnormal condition or normal winding up completion condition of film stoppage or the drive mechanism;
- (h) indicating means connected to the discriminating circuit means for indicating the abnormal condition based on the control signal, the indicating means having a plurality of indicating elements, one of which indicating one type of abnormal film condition and another of which for indicating other types of abnormal conditions;
- (i) said indicating means responsive to one of said control signals for selectively indicating the abnormal or indicating the normal condition by one of the control signals;
- and
- (j) said detection means sensing a perforated portion and non-perforated portion so that the movement of the film is detected when the film is moved.
8 more elements
Dependencies are inferred from the claim text.