Camera with magnetic recording device
AssigneeCanon Kabushiki Kaisha
InventorAkira Egawa
Life of this patent
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Abstract
This invention discloses a camera for recording information on a magnetic member provided on a film, in the course of feeding of the film. In such camera, this invention predicts the frame feeding speed, and controls the magnetic recording operation according to thus predicted feeding speed at the frame feeding of the film.
Claims27
A recording device for use in a camera capable of recording information on a film in the course of feeding thereof after the phototaking operation of each frame, or a camera provided with said recording device, comprising:
- a) a recording member for recording information on the film;
- b) a first detection circuit for detecting information of film feeding speed at a timing of film feeding, independent from the film feeding after the phototaking operation of each frame;
- c) a calculation circuit for calculating information of film feeding speed after the phototaking operation of each frame, based on the information on the film feeding speed detected by said first detection circuit;
- and
- d) a control circuit for controlling a recording operation by said recording member, based on the value calculated by said calculation circuit.
A camera of a type in which a film in a film cartridge is initially wound on a film winding shaft and is fed, at phototaking operations, frame by frame into said film cartridge, or a recording device for use in the camera of the above-mentioned type, comprising:
- a) a magnetic head for information recording in a magnetic recording part provided on said film;
- b) a first detection circuit for detecting information of the film feeding speed, in the course of film feeding from said film cartridge to said film winding shaft;
- c) a calculation circuit for calculating information of the film feeding speed at the film feeding by a frame into the film cartridge at a phototaking operation, based on the information of the feeding speed detected by said first detection circuit;
- and
- d) a control circuit for controlling the state of recording operation by said magnetic head, according to the information of the feeding speed calculated by said calculation circuit.
A camera of a type in which a film in a film cartridge is initially wound on a film winding shaft and is fed, at phototaking operations, frame by frame into said film cartridge, or a recording device for use in the camera of the above-mentioned type,
- a) a magnetic head for information recording in a magnetic recording part provided on said film,
- (b) a first detection circuit for detecting information of the film feeding speed, in the course of film feeding from said film cartridge to said film winding shaft;
- c) a film information detection circuit for detecting film information corresponding to the kind of said film;
- d) a calculation circuit for calculating information of the feeding speed at the film feeding by a frame into said film cartridge after a phototaking operation, based on the information on the feeding speed detected by said first detection circuit and the film information detected by said film information detection circuit;
- and
- e) a control circuit for controlling the state of recording operation by said magnetic head, according to the information of the feeding speed calculated by said calculation circuit.
A camera of a type in which a film in a film cartridge is initially wound on a film winding shaft and is fed, at phototaking operations frame by frame into said film cartridge, or a recording device for use in the camera of the above-mentioned type, comprising:
- a) a magnetic head for information recording in a magnetic recording part provided on said film;
- b) a first detection circuit for detecting information of the film feeding speed, in the course of film feeding from said film cartridge to said film winding shaft;
- c) a second detection circuit for detecting information of the feeding speed for each frame at the film feeding by a frame into the film cartridge after a phototaking operation;
- d) a calculation circuit for calculating information on the feeding speed for a frame to be fed next time, based on the information of the feeding speed of a previously fed frame, detected by said second detection circuit, and the information of the feeding speed detected by said first detection circuit;
- and
- e) a control circuit for controlling the state of recording operation by said magnetic head, according to the information of the feeding speed calculated by said calculation circuit.
A recording device for use in a camera capable of recording information on a film in the course of feeding thereof after the phototaking operation of each frame, or a camera provided with said recording device, comprising:
- (a) a recording member for recording information on the film;
- (b) a calculation circuit for calculating, in prediction, information on the film feeding speed of each frame, prior to the feeding of a corresponding frame;
- and
- (c) a control circuit for controlling a recording operation by said recording member, based on the value calculated by said calculation circuit.
A camera of a type in which a film in a film cartridge is initially wound on a film winding shaft and is fed, at phototaking operations, frame by frame into said film cartridge, or a recording device for use in the camera of the above-mentioned type, comprising:
- a) a film feeding control circuit for feeding the film, from a state fed to the film winding shaft, by a predetermined amount into said film cartridge and then feeding said film again to said film winding shaft;
- b) a first detection circuit for detecting information of the film feeding speed in the course of film feeding by said film feeding control circuit;
- c) a recording member for information recording on said film;
- and
- d) a control circuit for controlling the recording operation by said recording member, based on the information detected by said first detection circuit.
A recording device for use in a camera capable of recording information on a film in the course of feeding thereof after the phototaking operation of each frame, or a camera provided with said recording device, comprising:
- a) a recording member for recording information on the film;
- b) a first detection circuit for detecting information of the film feeding speed at the feeding of a frame;
- and
- c) a control circuit for controlling the recording operation by said recording member at a next frame feeding, based on the information detected by said first detection circuit.
Dependencies are inferred from the claim text.