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EP0229732A2
Expired / Lapsed
EP
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Recording and/or reproducing apparatus for longitudinal recording
Assignee: Sony Corp
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Filing: 1987-01-16
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Granted: —
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Expires: 2007-01-16
Abstract
Abstract A recording and/or reproducing apparatus employs azimuth-pair-head (41, 42, 43, 44) in a rotary head drum. The rotary head drum is axially shifted by a head shifting means. First tracks (No. 1, No. 2, No. 3, No. 4) are formed on a magnetic tape (10) during forward driving of the magnetic tape across the rotary head drum. On the other hand, second tracks (No. 5, No. 6, No. 7, No. 8) are formed adjacent to the first tracks during reverse driving across the rotary head drum. Since the first and second tracks are formed by means of the azimuth-pair-head, azimuth gaps thereof will have different or symmetrical obliquity to each other. This successfully avoids cross-talk between adjacent tracks to allow formation of the first and second tracks in a tightly arranged fashion. As a consequence, high-density longitudinal recording without cross-talk between adjacent tracks becomes possible.
Inventors
- 👤 Etsuro C/O Sony Corporation Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/008; G11B15/00; G11B15/18; G11B15/1808; G11B5/00813; G11B5/00817; G11B5/00839; G11B5/53; G11B5/531; G11B5/535
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
277 words
A parallel scanning tape recording and/or reproducing apparatus for a magnetic tape, characterised in that it comprises: a rotary head drum (l6) carrying an azimuth-pair-head constituted by first and second magnetic heads, (4l,42), said first magnetic head (4l) being formed with a first gap (4la) and said second magnetic head (42) being formed with a second gap (42a) with an azimuth angle different from that of said first gap, (4la), said first and second magnetic heads (4l,42) being cooperative in forming a portion of a single longitudinally extending track on a magnetic tape (l0) in one cycle of a recording operation, said track portion having a first section formed by means of said first magnetic head (4l) and having a first azimuth pattern and a second section formed by means of said second magnetic head (42) and having a second azimuth pattern which is different from said first azimuth pattern of said first section; means for guiding said magnetic tape (l0) onto said rotary head drum (l6) for recording and reproduction, said guiding means, in use, wrapping said magnetic tape (l0) on the periphery of said rotary head drum (l6) so that the longitudinal axis of said magnetic tape (l0) lies perpendicular to the rotation axis of said rotary head drum (l6) and that said magnetic tape (l0) mates with the periphery of said rotary head drum (l6) are a predetermined angular range around the axis of the head; and means, cooperating with said azimuth-pair-head (4l,42) for shifting said azimuth-pair-head (4l,42) relative to the tape in a direction parallel to said rotation axis of said rotary head drum (l6) for switching scanning tracks of said azimuth-pair-head (4l,42).
Claim 2
Dependent Claim
277 words
A parallel scanning tape recording and/or reproducing apparatus for a magnetic tape, characterised in that it comprises: a rotary head drum (l6) carrying an azimuth-pair-head constituted by first and second magnetic heads, (4l,42), said first magnetic head (4l) being formed with a first gap (4la) and said second magnetic head (42) being formed with a second gap (42a) with an azimuth angle different from that of said first gap, (4la), said first and second magnetic heads (4l,42) being cooperative in forming a portion of a single longitudinally extending track on a magnetic tape (l0) in one cycle of a recording operation, said track portion having a first section formed by means of said first magnetic head (4l) and having a first azimuth pattern and a second section formed by means of said second magnetic head (42) and having a second azimuth pattern which is different from said first azimuth pattern of said first section; means for guiding said magnetic tape (l0) onto said rotary head drum (l6) for recording and reproduction, said guiding means, in use, wrapping said magnetic tape (l0) on the periphery of said rotary head drum (l6) so that the longitudinal axis of said magnetic tape (l0) lies perpendicular to the rotation axis of said rotary head drum (l6) and that said magnetic tape (l0) mates with the periphery of said rotary head drum (l6) are a predetermined angular range around the axis of the head; and means, cooperating with said azimuth-pair-head (4l,42) for shifting said azimuth-pair-head (4l,42) relative to the tape in a direction parallel to said rotation axis of said rotary head drum (l6) for switching scanning tracks of said azimuth-pair-head (4l,42).
Claim 3
Dependent Claim
115 words
Apparatus as set forth in claim l, wherein said shifting means is arranged to shift said azimuth-pair-head (4l,42) in a first direction to form portions of a first group of longitudinal tracks Nos l - 4 and in a second direction opposite to said first direction to form portions of a second group of longitudinal tracks Nos 5 - 7, each of said longitudinal tracks of said first group Nos l - 4 being formed in spaced apart relationship to the other for leaving a given clearance therebetween, and each of said longitudinal tracks of said second group Nos 5 - 7 being formed in said clearances between said longitudinal tracks of said first group.
Claim 4
Dependent Claim
119 words
A parallel scanning tape recording and/or reproducing apparatus for magnetic tape, characterised in that it comprises a rotary head drum (l6) carrying an azimuth-pair-head having first and second head portions having differing azimuth angles and means for guiding said tape (l0) around part of the periphery said rotary head drum (l6), for recording and reproduction of a signal, such that the longitudinal axis of said magnetic tape (l6) is perpendicular to the rotation axis of said rotary head drum (l6), the arrangement being such that in use during rotation of said head a first group of longitudinal track portions are decoded with lateral clearances therebetween and thereafter a second group of longitudinal track portions are recorded in said clearances.
Claim 5
Dependent Claim
119 words
A parallel scanning tape recording and/or reproducing apparatus for magnetic tape, characterised in that it comprises a rotary head drum (l6) carrying an azimuth-pair-head having first and second head portions having differing azimuth angles and means for guiding said tape (l0) around part of the periphery said rotary head drum (l6), for recording and reproduction of a signal, such that the longitudinal axis of said magnetic tape (l6) is perpendicular to the rotation axis of said rotary head drum (l6), the arrangement being such that in use during rotation of said head a first group of longitudinal track portions are decoded with lateral clearances therebetween and thereafter a second group of longitudinal track portions are recorded in said clearances.
Claim 6
Dependent Claim
88 words
Apparatus according to claim 3 and including means, cooperative with said azimuth-pair-head, for shifting the latter in a direction parallel to said rotation axis of said rotary head drum (l6), said shifting means shifting said azimuth-pair-head relative to the tape in a first axial direction for forming said first group of longitudinal track portions which are separated from each other by a predetermined clearance left therebetween, and in the opposite axial direction for forming said second group of longitudinal track portions in said clearances between adjacent first tracks.
Claim 7
Dependent Claim
40 words
Apparatus as set forth in any one of claims l to 4 wherein said shifting means intermittently shifts said azimuth-pair-head (4l,42) relative to said tape (l0) for switching scanning tracks in synchronism with rotation of said rotary head drum (l6).
Claim 8
Dependent Claim
57 words
Apparatus as set forth in any one of the preceding claims wherein said shifting means intermittently shifting said azimuth-pair-head (4l,42) in said axial first direction up to reaching a first end track No 4 and subsequently reversing shifting direction to shift said azimuth-pair-head (4l,42) in axial second direction up to reaching a second end track No 7.
Claim 9
Dependent Claim
48 words
Apparatus as set forth in any one of the preceding claims wherein said longitudinal tracks of one group (Nos l - 4) of track portions has a first section opposing a second section of adjacent longitudinal tracks of a second group (Nos 5 - 7) of track portions.
Claim 10
Dependent Claim
37 words
Apparatus as set forth in any one of the preceding claims wherein said shifting means is operative to shift said azimuth-pair-head (4l,42) during a period in which said azimuth-pair-head (4l,42) is out of said predetermined angular range.
Claim 11
Dependent Claim
47 words
Apparatus as set forth in any one of claims 2 to 7 wherein said given clearance between said longitudinal tracks of said first group Nos l-4 corresponds to the lateral width of said longitudinal tracks of said second group Nos 5 - 7 to be formed therein.
Claim 12
Dependent Claim
61 words
l0. Apparatus as set forth in any one of claims 2 to 8 which performs recording and reproducing both in forward and reverse driving of said tape (l0) and a scanning angular range over which said azimuth-pair-head (4l,42) scans the tape (l0), is so adjusted as to form longitudinal tracks of equal longitudinal length both in forward recording and reverse recording.
Claim 13
Dependent Claim
64 words
Apparatus as set forth in claim l0 wherein said tape (l0) is separated into first and second halves by the longitudinal axis thereof, said first half being scanned by said azimuth-pair-head (43,44) for recording or reproduction while said tape (l0) is driven in forward direction and said second half being scanned by said azimuth-pair-head (4l,42) while said tape (l0) is driven in reverse direction.
Claim 14
Dependent Claim
23 words
Apparatus as set forth in claim ll wherein track pattern formed in said first half is symmetric to that formed in second half.
Claim 15
Dependent Claim
44 words
Apparatus as set forth in any one of the preceding claims which further comprises auxiliry rotary head drum l5 with an azimuth-pair-head, said auxiliary rotary head drum (l5) being designed and arranged for recording and reproducing on the back side of said tape (l0).
Claim 16
Dependent Claim
40 words
Apparatus as set forth in any one of the preceding claims wherein said tape (l0) guiding means is designed for guiding said tape (l0) onto both of rotary head drums (l5,l6) for sequential operation of said rotary head drums (l5,l6).
Claim 17
Dependent Claim
40 words
Apparatus as set forth in any one of the preceding claims wherein said rotary head drum (l6) is provided with first and second azimuth-pair-heads which are associated with said shifting means to be axially shifted in synchronism with each other.
Claim 18
Dependent Claim
58 words
Apparatus as set forth in claim l5 wherein said shifting means comprises a linear motor (38) and movement (40) driven by said linear motor (38) in parallel to the rotation axis of said rotary head drum (l6), said movement (40) carrying said first and second azimuth-pair-heads for simultaneously shifting both heads in axial directions for switching scanning tracks.
Claim 19
Dependent Claim
20 words
Apparatus as set forth in any one of the preceding claims an operative to record and/or reproduce a video signal.
Claim 20
Dependent Claim
53 words
Apparatus as set forth in claim l7 wherein the arrangement is such that the portions of said first (Nos l - 4) and second (Nos 5 - 7) groups of tracks which are formed in first and second direction - shifting cycles of the head store the video data of one video field.
Claim 21
Independent Claim
209 words
A method of recording and/or reproducing information on a plurality of tracks formed on a magnetic tape (l0) and extending parallel to the longitudinal axis of said magnetic tape (l0) characterised in that it comprises the steps of: providing a rotary head drum (l6) with a pair of first and second magnetic heads (4l,42) constituting an azimuth-pair-head, said first and second magnetic heads (4l,42), being formed with azimuth gaps with mutually different azimuth angle and cooperating with each other for scanning a portion of a single track on said tape in one cycle of rotation of said rotary head drum (l6); guiding said magnetic tape (l0) on said rotary head drum (l6) in such a manner that said magnetic tape (l0) runs in parallel to the motion race of said azimuth-pair-head and is wrapped onto the periphery of said rotary head drum (l6) over a predetermined angular range, around the axis of the head; and shifting said azimuth-pair-head from one track to the other track every one cycle of rotation of said rotary head drum (l6), the magnitude of the shift of said azimuth-pair-head in every shifting operation substantially corresponding to twice the axial width of individual track thereby to scan alternate tracks across the width of the tape.
Claim 22
Independent Claim
209 words
A method of recording and/or reproducing information on a plurality of tracks formed on a magnetic tape (l0) and extending parallel to the longitudinal axis of said magnetic tape (l0) characterised in that it comprises the steps of: providing a rotary head drum (l6) with a pair of first and second magnetic heads (4l,42) constituting an azimuth-pair-head, said first and second magnetic heads (4l,42), being formed with azimuth gaps with mutually different azimuth angle and cooperating with each other for scanning a portion of a single track on said tape in one cycle of rotation of said rotary head drum (l6); guiding said magnetic tape (l0) on said rotary head drum (l6) in such a manner that said magnetic tape (l0) runs in parallel to the motion race of said azimuth-pair-head and is wrapped onto the periphery of said rotary head drum (l6) over a predetermined angular range, around the axis of the head; and shifting said azimuth-pair-head from one track to the other track every one cycle of rotation of said rotary head drum (l6), the magnitude of the shift of said azimuth-pair-head in every shifting operation substantially corresponding to twice the axial width of individual track thereby to scan alternate tracks across the width of the tape.
Claim 23
Independent Claim
56 words
A method as set forth in claim l9 wherein shifting is caused in first axial direction and second axial direction opposite to said first axial direction, and in shifting in said first axial direction, said azimuth-pair-head scans first tracks and in shifting in second axial direction, said azimuth-pair-head scans second tracks located between said first tracks.
Claim 24
Dependent Claim
39 words
2l. A method as set forth in claim 20, wherein adjacent first and second tracks are formed by means of said azimuth-pair-head in such a manner that the sections of tracks opposing to each other have different azimuth patterns.
Claim 25
Independent Claim
52 words
A method as set forth in any one of claims l9 to 2l which further comprises steps of providing an auxiliary rotary head drum (l5) with an azimuth-pair-head and guiding said magnetic tape (l0) onto said auxiliary rotary head drum (l5) for scanning tracks on the back of said magnetic tape (l0).
Claim 26
Independent Claim
28 words
A method as set forth in any one of claims l9 to 22 which further comprises a step of reversing tape driving direction between forward and reverse directions.
Claim 27
Independent Claim
78 words
A method as set forth in any one of claims 20 to 22 which further comprises a step of reversing tape driving direction between forward and reverse directions, and a first group of said first and second tracks are formed in a first half of said magnetic tape (l0) during forward driving, a second group of first and second tracks are formed in a second half of said magnetic tape (l0) during tape driving in said reverse direction.
Claim 28
Independent Claim
21 words
A method as set forth in any one of claims l9 to 24 used for recording and/or reproducing a video signal.
Claim 29
Dependent Claim
34 words
A video recording recorded or reproduced by apparatus as set forth in any one of claims l to l8 or by a method as set forth in any one of claims l9 to 25.
References Cited (Backward Citations)
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