Mirror-image magnetic information recording methods particularly for video signals

Claim 2

In a method of producing, for subsequent copying onto a copy tape by a tape-to-tape copying process, a slant-track or transverse-scan master record of information on a master recording tape having parallel longitudinal edges, by the use of recording means adapted to be operatively coupled with said master recording tape for recording said information thereon, the improvement of: a. advancing said master recording tape; b. moving said recording means relatively to said advancing master recording tape along first recording tracks extending on said master recording tape with respect to said longitudinal edges at angles which are mirror images of angles of corresponding second recording tracks required on said copy tape under a predetermined convention for a playback of said information from said copy tape; and c. recording with said recording means said information in said first recording tracks during said movement of said recording means along said first recording tracks.

Claim 3

A method as claimed in claim 1, wherein said movement of said recording means relative to said master recording tape includes: a. moving said recording means substantially in a predetermined plane; and b. transporting said mAster recording tape at an angle which, as seen from a predetermined reference point, is a mirror image of an angle required under a predetermined convention for a playback of said information from said copy tape.

Claim 4

In a method of recording information on a master recording tape, producing on a copy tape a copy of said information, and playing back said copied information from said copy tape, the improvement comprising in combination: a. relatively moving information recording means and said master recording tape along first recording tracks extending on said master recording tape at predetermined first angles to a direction of movement of said master recording tape, and recording with said information recording means said information in said first recording tracks during said relative movement of said information recording means and said master recording tape; b. producing on said copy tape, by a tape-to-tape copying process, a copy of said recorded information in the form of an information record contained in second recording tracks extending at second angles which are mirror images of said first angles; and c. relatively moving information playback means and said copy tape along said second recording tracks and playing back with said information playback means the information from said copy on said copy tape during said relative movement of said information playback means and said copy tape.

Claim 5

In a method of recording information on a master recording tape, producing on a copy tape a copy of said information, and playing back said copied information from said copy tape, the improvement comprising in combination: a. relatively moving information recording means and said master recording tape along first recording tracks extending on said master recording tape at predetermined first angles to a direction of movement of said master recording tape, and recording with said information recording means said information in said first recording tracks during said relative movement of said information recording means and said master recording tape; b. producing on said copy tape, by a tape-to-tape copying process, a copy of said recorded information in the form of an information record contained in second recording tracks extending at second angles which are mirror images of said first angles; and c. relatively moving information playback means and said copy tape along said second recording tracks and playing back with said information playback means the information from said copy on said copy tape during said relative movement of said information playback means and said copy tape.

Claim 6

In a method of recording information on a master recording tape having a first top surface and first parallel longitudinal edges, producing on a copy tape having a second top surface and second parallel longitudinal edges a copy of said information, and playing back said copied information from said copy tape, the improvement comprising in combination: a. relatively moving information recording means and said master recording tape along first recording tracks individually extending on said master recording tape, as seen from said first top surface, from at least the vicinity of one of said first longitudinal edges to at least the vicinity of the other of said first longitudinal edges, and at predetermined first angles relative to said first longitudinal edges, and recording with said information recording means said information in said first recording tracks during said relative movement of said information recording means and said master recording tape; b. producing on said copy tape, by a tape-to-tape copying process, a copy of said recorded information in the form of an information record contained in second recording tracks individually extending, as seen from said second top surface, from at least the vicinity of one of said second longitudinal edges corresponding to said one of said first longitudinal edges, to at least the vicinity of the other of said second longitudinal edges corresponding to said other of said first longitudinal edges, and at second angles which are mirror images of said first angles; and c. relatively moving information playback means and said copy tape along said second recording tracks and playing back with said information playback means the information from said copy on said copy tape during said relative movement of said information playback means and said copy tape.

Claim 7

In a method of recording information on a master recording tape having a first top surface and first parallel longitudinal edges, producing on a copy tape having a second top surface and second parallel longitudinal edges a copy of said information, and playing back said copied information from said copy tape, the improvement comprising in combination: a. relatively moving information recording means and said master recording tape along first recording tracks individually extending on said master recording tape, as seen from said first top surface, from at least the vicinity of one of said first longitudinal edges to at least the vicinity of the other of said first longitudinal edges, and at predetermined first angles relative to said first longitudinal edges, and recording with said information recording means said information in said first recording tracks during said relative movement of said information recording means and said master recording tape; b. producing on said copy tape, by a tape-to-tape copying process, a copy of said recorded information in the form of an information record contained in second recording tracks individually extending, as seen from said second top surface, from at least the vicinity of one of said second longitudinal edges corresponding to said one of said first longitudinal edges, to at least the vicinity of the other of said second longitudinal edges corresponding to said other of said first longitudinal edges, and at second angles which are mirror images of said first angles; and c. relatively moving information playback means and said copy tape along said second recording tracks and playing back with said information playback means the information from said copy on said copy tape during said relative movement of said information playback means and said copy tape.

Claim 8

In a method of recording information on a master recording tape with the aid of recording head means, producing on a copy tape a copy of the recorded information, and playing back said copy of the recorded information from said copy tape with the aid of playback head means, the improvement comprising in combination: a. rotating said recording head means in a predetermined plane; b. transporting said master recording tape by way of said predetermined plane at a first angle relative to said plane and recording said information in a slant-track pattern on said master recording tape with said recording head means; c. producing on said copy tape and with a one-step tape-to-tape copying process a mirror-image copy of said slant-Track pattern including a copy of said information; d. rotating said playback head means in a predetermined plane; and e. transporting said copy tape by way of said plane of rotation of said playback head means at a second angle relative to said plane of rotation of said playback head means, with said first and second angles being mirror images of each other, and playing back with said playback head means said copy of the information from said mirror-image copy of the slant-track pattern on the copy tape.

Claim 9

In a method of recording information on a master recording tape with the aid of recording head means, producing on a copy tape a copy of the recorded information, and playing back said copy of the recorded information from said copy tape with the aid of playback head means, the improvement comprising in combination: a. rotating said recording head means in a predetermined plane; b. transporting said master recording tape by way of said predetermined plane at a first angle relative to said plane and recording said information in a slant-track pattern on said master recording tape with said recording head means; c. producing on said copy tape and with a one-step tape-to-tape copying process a mirror-image copy of said slant-Track pattern including a copy of said information; d. rotating said playback head means in a predetermined plane; and e. transporting said copy tape by way of said plane of rotation of said playback head means at a second angle relative to said plane of rotation of said playback head means, with said first and second angles being mirror images of each other, and playing back with said playback head means said copy of the information from said mirror-image copy of the slant-track pattern on the copy tape.