Magnetic record camera
AssigneeCanon Kabushiki Kaisha
InventorsToru Nagata, Kazuhiro Izukawa
Life of this patent
Estimating the term…
Abstract
A camera uses a film having a magnetic record member for each frame on film. When the film is loaded in the camera, the information recorded in the record member of each frame is detected. It is judged whether each frame is exposed or unexposed. Even if some frames on the leader side and on the trailer side of film were already exposed, the camera can perform accurate positioning of first unexposed frame and exposure on each unexposed frame.
Claims16
A camera, capable of being loaded with a film having a leader-end and a trailer-end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- a judgement circuit for judging whether a frame of a film is exposed or not based on information detected by the information detecting means;
- unexposed frame detecting means for detecting, based on a judgement result of said judgement circuit, a first leader-end unexposed frame of film from the leader end of the film and a first trailer-end unexposed frame of film from the trailer-end of the film;
- an exposure control circuit for controlling successive exposures from the first trailer-end unexposed frame of film detected by said unexposed frame detecting means to the first leader-end unexposed frame of film detected by said unexposed frame detecting means, or from the first leader-end unexposed frame of film detected by said unexposed frame detecting means to the first trailer-end unexposed frame of film detected by said unexposed frame detecting means;
- a frame number count circuit for counting frame numbers in the process of film feeding;
- a frame number detecting circuit for detecting, based on the frame number counted by said frame number count circuit, a frame number corresponding to a first leader-end unexposed frame and a frame number corresponding to a first trailer-end unexposed frame which are detected by said unexposed frame detecting means;
- a calculation circuit for calculating, based on the frame number detected by said frame number detecting circuit, an exposure order number representing an exposure order that sequentially follows a number of previously exposed frames;
- and
- record control means for recording the exposure order number calculated by said calculation circuit in the record portion of each frame of film.
A camera, capable of being loaded with a film cartridge having a film with a leader-end and a trailer-end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- first feed control means for successively feeding a loaded film from the leader-end portion of the film in such a direction that frames on the trailer-end of the film are drawn out of the cartridge;
- a judgement circuit for judging whether each frame of the film is exposed or not, based on frame information detected by the information detecting means upon feeding of the film by said first feed control means;
- and
- control means for controlling exposure of each frame of the film, the exposure control being based on the frame information of the first unexposed frame from the leader-end of the film as judged by said judgement circuit and frame information of the last successively exposed frame from the trailer-end of the film as judged by said judgement circuit from the first unexposed frame from the leader-end of the film to a frame immediately adjacent, on the leader-end side of the film, to the last successively exposed frame from the trailer-end of the film, or from the frame immediately adjacent, on the leader-end side of the film, to the last successively exposed frame from the trailer-end of the film to the first unexposed frame from the leader-end of the film.
A camera, capable of being loaded with a film cartridge having a film with a leader-end and a trailer-end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- first feed control means for successively feeding a loaded film from the leader-end portion of the film in such a direction that frames on the trailer-end of the film are drawn out of the cartridge;
- a judgement circuit for judging whether each frame of the film is exposed or unexposed, based on frame information detected by the information detecting means upon feeding of the film by said first feed control means;
- and
- an exposure control circuit for controlling successive exposures from a first unexposed frame from the leader-end of the film to a frame immediately adjacent, on the leader-end side of the film, to a last successively exposed frame from the trailer-end of the film, or from the frame immediately adjacent, on the leader-end side of the film, to the last successively exposed frame from the trailer-end of the film to the first unexposed frame from the leader-end of the film on the basis of a judgement result by said judgement circuit.
A camera, capable of being loaded with a film having a leader end and a trailer end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- a judgement circuit for judging whether each frame of film is exposed or unexposed, based on the frame information;
- and
- a calculation circuit for calculating a number of unexposed frames based on a judgement result of said judgement circuit;
- and
- display means for displaying the number of unexposed frames.
A camera, capable of being loaded with a film cartridge having a film with a leader end and a trailer end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- first feed control means for successively feeding a loaded film from the leader-end portion of the film in such a direction that frames on the trailer-end of the film are drawn out of the cartridge;
- a first judgement circuit for judging whether each frame of the film is exposed or not, based on frame information detected by the information detecting means upon feeding of the film by said first feed control means;
- a second judgement circuit for judging whether a number of successive unexposed frames, which is judged during feeding of the film by said first feed control means after said first judgement circuit judges a first unexposed frame of film, is smaller than a predetermined value;
- and
- a first processing circuit for processing an unexposed frame as an exposed frame if said second judgement circuit judges that the number of successive unexposed frames is smaller than the predetermined value.
A camera, capable of being loaded with a film cartridge having a film with a leader end and a trailer end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, and which performs exposure on an unexposed frame of the film, said camera comprising:
- first feed control means for successively feeding a loaded film from the leader-end portion of the film in such a direction that frames on the trailer-end of the film are drawn out of the cartridge;
- a judgement circuit for judging whether each frame of the film is exposed or not, based on frame information detected by the information detecting means upon feeding of the loaded film by said first feed control means;
- and
- an abnormal judgement circuit for giving a judgement of abnormal operation if, after said judgement circuit has judged at least a first predetermined number of successive frames as unexposed, said judgement circuit judges a second predetermined number of successive frames as unexposed following at least one frame judged as exposed.
A camera, capable of being loaded with a film cartridge having a film with a leader end and a trailer end, having information detecting means for detecting frame information in a record portion provided for each frame of a film loaded in said camera, which performs exposure on an unexposed frame of the film, said camera comprising:
- first feed control means for successively feeding the loaded film from the leader-end portion of the film in such a direction that frames on the trailer end of the film are drawn out of the cartridge;
- a judgement circuit for judging whether each frame of the film is exposed or not, based on the frame information detected by the information detecting means upon feeding of the film by said first feed control means;
- and
- an abnormal judgement circuit for providing a judgement of abnormal operation if, in film feeding after said judgment circuit judges a frame as exposed, frames judged as unexposed are discontinuously present.
Dependencies are inferred from the claim text.