Method and apparatus for magnetic recording and regeneration

Claim 1

A method of magnetic recording which is applied to a film cartridge winding a photographic film which has a magnetic layer and perforations indicating a reference position of each frame around a single spool, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, which include respective single perforations formed between frames, one perforation formed before a first frame and one perforation formed after a last frame, at the time of said step of rewinding; and recording information which corresponds to the detected perforations in the magnetic layer during rewinding of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, N+1 perforations being formed on the photographic film, every time a perforation is detected, information relating to a frame following the detected perforation is recorded in the magnetic layer, including detection of an Nth perforation, and when an (N+1)th perforation is detected, information relating to the photographic film as a whole is recorded in the magnetic layer.

Claim 2

A method of magnetic recording which is applied to a film cartridge winding a photographic film which has a magnetic layer and perforations indicating a reference position of each frame around a single spool, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, which include respective single perforations formed between frames, one perforation formed before a first frame and one perforation formed after a last frame, at the time of said step of rewinding; and recording information which corresponds to the detected perforations in the magnetic layer during rewinding of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, N+1 perforations being formed on the photographic film, every time a perforation is detected, information relating to a frame following the detected perforation is recorded in the magnetic layer, including detection of an Nth perforation, and when an (N+1)th perforation is detected, information relating to the photographic film as a whole is recorded in the magnetic layer.

Claim 6

A method of magnetic recording and regenerating in which a film conveyer feeds a photographic film.

Claim 7

A method of magnetic recording and regenerating in which a film conveyer feeds a photographic film.

Claim 10

An apparatus for magnetic recording and regeneration, comprising: means for conveying a photographic film having a magnetic layer and perforations indicating a reference position of each frame at a predetermined speed; first detecting means for detecting said perforations; second detecting means for detecting said perforations, said second detecting means being provided at a position apart from said first detecting means by a multiple of a distance between frames in a film feed direction; a magnetic head for recording/regenerating information in the magnetic layer corresponding to each frame and the magnetic layer on a forward end portion of said photographic film in which a perforation is not provided; and means for making said magnetic head record and regenerate information every time at least one of said first and second detecting means detect a perforation.

Claim 11

An apparatus for magnetic recording and regeneration, comprising: means for conveying a photographic film having a magnetic layer and perforations indicating a reference position of each frame at a predetermined speed; first detecting means for detecting said perforations; second detecting means for detecting said perforations, said second detecting means being provided at a position apart from said first detecting means by a multiple of a distance between frames in a film feed direction; a magnetic head for recording/regenerating information in the magnetic layer corresponding to each frame and the magnetic layer on a forward end portion of said photographic film in which a perforation is not provided; and means for making said magnetic head record and regenerate information every time at least one of said first and second detecting means detect a perforation.

Claim 12

A method of recording on photographic film having, a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, including two respective perforations formed for each frame which respectively indicate a forward end and a rear end of a frame, a perforation formed before a first frame and a perforation formed after a last frame, during said step of rewinding; and recording information which correspond to the detected perforations in the magnetic layer of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, 2N+2 perforations being formed on the photographic film, every time an even-numbered perforation is detected, information relating to a frame following the detected even-numbered perforation is recorded in the magnetic layer, including detection of a 2Nth perforation, and when a (2N+2)th perforation is detected, information relating to the photographic film as a whole is recorded in the magnetic layer in the leader portion, the leader portion having no perforations formed therein.

Claim 13

A method of recording on photographic film having, a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, including two respective perforations formed for each frame which respectively indicate a forward end and a rear end of a frame, a perforation formed before a first frame and a perforation formed after a last frame, during said step of rewinding; and recording information which correspond to the detected perforations in the magnetic layer of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, 2N+2 perforations being formed on the photographic film, every time an even-numbered perforation is detected, information relating to a frame following the detected even-numbered perforation is recorded in the magnetic layer, including detection of a 2Nth perforation, and when a (2N+2)th perforation is detected, information relating to the photographic film as a whole is recorded in the magnetic layer in the leader portion, the leader portion having no perforations formed therein.

Claim 14

A method of recording/reproducing data on a magnetic layer of photographic film which includes a plurality of frames and a plurality of perforations which indicate corresponding reference positions of each of the frames, the photographic film being wound within a film cartridge, comprising the steps of: a) prefeeding the photographic film from the film cartridge toward a take-up spool; b) detecting a first perforation closest to a forward end of the photographic film during said step a); c) rewinding the photographic film by a predetermined length after detection of the first perforation in said step b); d) feeding the photographic film after completion of said step c); and e) recording/reproducing the data on the magnetic layer of the photographic film during said step d).

Claim 15

A method of recording/reproducing data on a magnetic layer of photographic film which includes a plurality of frames and a plurality of perforations which indicate corresponding reference positions of each of the frames, the photographic film being wound within a film cartridge, comprising the steps of: a) prefeeding the photographic film from the film cartridge toward a take-up spool; b) detecting a first perforation closest to a forward end of the photographic film during said step a); c) rewinding the photographic film by a predetermined length after detection of the first perforation in said step b); d) feeding the photographic film after completion of said step c); and e) recording/reproducing the data on the magnetic layer of the photographic film during said step d).

Claim 18

A method of recording/reproducing data on a magnetic layer of photographic film which includes a plurality of frames and a plurality of perforations which indicate corresponding reference positions of each of the frames, the photographic film being wound within a film cartridge, comprising the steps of: a) feeding the photographic film from the film cartridge to a take-up spool; b) rewinding the photographic film from the take-up spool toward the film cartridge; c) detecting a first perforation closest to a forward end of the photographic film during said step b); d) rewinding the photographic film by a predetermined length after detection of the first perforation in said step c); e) feeding the photographic film after completion of said step d); and f) recording/reproducing the data on the magnetic layer of the photographic film during said step e).

Claim 19

A method of recording/reproducing data on a magnetic layer of photographic film which includes a plurality of frames and a plurality of perforations which indicate corresponding reference positions of each of the frames, the photographic film being wound within a film cartridge, comprising the steps of: a) feeding the photographic film from the film cartridge to a take-up spool; b) rewinding the photographic film from the take-up spool toward the film cartridge; c) detecting a first perforation closest to a forward end of the photographic film during said step b); d) rewinding the photographic film by a predetermined length after detection of the first perforation in said step c); e) feeding the photographic film after completion of said step d); and f) recording/reproducing the data on the magnetic layer of the photographic film during said step e).

Claim 22

A method of recording on photographic film having a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, including two respective perforations formed for each frame which respectively indicate a forward end and a rear end of a frame, a perforation formed before a first frame and a perforation formed after a last frame, during said step of rewinding; and recording information which correspond to the detected perforations in the magnetic layer of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, 2N+2 perforations are formed on the photographic film, every time an odd-numbered perforation is detected, information relating to a frame following the detected odd-numbered perforation is recorded in the magnetic layer, including detection of a (2N-1)th perforation, and when a (2N+2)th perforation is detected, information relating to the photographic film as a whole is recorded in the leader portion, the leader portion having no perforations formed therein.

Claim 23

A method of recording on photographic film having a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations, including two respective perforations formed for each frame which respectively indicate a forward end and a rear end of a frame, a perforation formed before a first frame and a perforation formed after a last frame, during said step of rewinding; and recording information which correspond to the detected perforations in the magnetic layer of the photographic film, a number of frames recorded on the photographic film being N, such that N is an integer, 2N+2 perforations are formed on the photographic film, every time an odd-numbered perforation is detected, information relating to a frame following the detected odd-numbered perforation is recorded in the magnetic layer, including detection of a (2N-1)th perforation, and when a (2N+2)th perforation is detected, information relating to the photographic film as a whole is recorded in the leader portion, the leader portion having no perforations formed therein.

Claim 24

A method of recording on photographic film having a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations during rewinding, the photographic film including respective single perforations formed between frames, one perforation formed before a first frame and one perforation formed after a last frame such that N+1 perforations are formed in the photographic film; recording information in the magnetic layer of the photographic film during rewinding each time a perforation is detected, information relating to the photographic film as a whole being recorded in the magnetic layer in the leader portion upon detection of the (N+1)th perforation, the leader portion having no perforations formed therein.

Claim 25

A method of recording on photographic film having a leader portion, a magnetic layer and a plurality of perforations indicating respective reference positions of each frame of the photographic film, the photographic film being wound from a film cartridge, comprising the steps of: rewinding the photographic film into the film cartridge; detecting the perforations during rewinding, the photographic film including respective single perforations formed between frames, one perforation formed before a first frame and one perforation formed after a last frame such that N+1 perforations are formed in the photographic film; recording information in the magnetic layer of the photographic film during rewinding each time a perforation is detected, information relating to the photographic film as a whole being recorded in the magnetic layer in the leader portion upon detection of the (N+1)th perforation, the leader portion having no perforations formed therein.