Patent US1348830A successfully refreshed from Google Patents.
Patent EP0356938A2 successfully refreshed from Google Patents.
EP0356938A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Rotary head assembly for substantially concurrent recording and monitoring of data on a magnetic tape cassette or the like
Assignee: Teac Corp
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Filing: 1989-08-25
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Granted: —
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Expires: 2009-08-25
Abstract
Abstract A rotary-head assembly for the storage and retrieval of digital data on and from a series of slanting record tracks on magnetic tape in cassette form or the like, with the capability of substantially concurrently monitoring the recording being written on the tape. The rotary-head assembly includes a rotary drum to which there are mounted first and second magnetic read/write heads and first and second magnetic monitor heads. The two read/write heads alternately and overwritingly scan the magnetic tape for creating a series of slanting record tracks thereon. For monitoring the data being written by the first and second read/write heads, the first and second monitor heads scan the overwritten tracks spaced at least two tracks from the tracks being written by the first and second read/write heads, respectively. therefore, being representative of the recording on the overwritten tracks, instead of on the tracks before they are overwritten, the output signals of the monitor heads lend themselves to a more accurate evaluation of the data to be reproduced.
Inventors
- 👤 Masato Deguchi
- 👤 Toshihiko Hamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:31
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B20/18; G11B20/1816; G11B27/00; G11B27/36; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/48; G11B5/52; G11B5/53; G11B5/531
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
329 words
A magnetic tape apparatus of the type having a rotary head assembly for the storage and retrieval of digital data on and from a series of slanting record tracks on magnetic tape such as that in the form of a cassette, wherein the improvement resides in the rotary head assembly comprising: (a) a rotary drum rotatable in a predetermined direction about a predetermined axis, with the magnetic tape partly wrapped around the rotary drum for traveling past the same; (b) a first primary head on the rotary drum for at least writing data on the magnetic tape; (c) a second primary head on the rotary drum for at least writing data on the magnetic tape, the first and second primary heads alternately scanning the magnetic tape for creating a series of slanting record tracks thereon, each primary head overwriting the preceding record track formed by the other primary head; (d) a first secondary head on the rotary drum for at least monitoring the data written on the magnetic tape by the first primary head, the first secondary head being displaced from the first primary head both angularly and axially on the rotary drum to such extents as to scan each record track that has been created by the first primary head and which has been subsequently overwritten by the second primary head; and (e) a second secondary head on the rotary drum for at least monitoring the data written on the magnetic tape by the second primary head, the second secondary head being displaced from the second primary head both angularly and axially on the rotary drum to such extents as to scan each overwritten record track that has been created by the second primary head and which has been subsequently overwritten by the first primary head; (f) whereby the output signals of the first and second secondary heads can be utilized for evaluating the recording on the overwritten tracks, instead of on the tracks before they are overwritten.
Claim 2
Dependent Claim
329 words
A magnetic tape apparatus of the type having a rotary head assembly for the storage and retrieval of digital data on and from a series of slanting record tracks on magnetic tape such as that in the form of a cassette, wherein the improvement resides in the rotary head assembly comprising: (a) a rotary drum rotatable in a predetermined direction about a predetermined axis, with the magnetic tape partly wrapped around the rotary drum for traveling past the same; (b) a first primary head on the rotary drum for at least writing data on the magnetic tape; (c) a second primary head on the rotary drum for at least writing data on the magnetic tape, the first and second primary heads alternately scanning the magnetic tape for creating a series of slanting record tracks thereon, each primary head overwriting the preceding record track formed by the other primary head; (d) a first secondary head on the rotary drum for at least monitoring the data written on the magnetic tape by the first primary head, the first secondary head being displaced from the first primary head both angularly and axially on the rotary drum to such extents as to scan each record track that has been created by the first primary head and which has been subsequently overwritten by the second primary head; and (e) a second secondary head on the rotary drum for at least monitoring the data written on the magnetic tape by the second primary head, the second secondary head being displaced from the second primary head both angularly and axially on the rotary drum to such extents as to scan each overwritten record track that has been created by the second primary head and which has been subsequently overwritten by the first primary head; (f) whereby the output signals of the first and second secondary heads can be utilized for evaluating the recording on the overwritten tracks, instead of on the tracks before they are overwritten.
Claim 3
Dependent Claim
54 words
The invention of claim 1 wherein the first secondary head scans each overwritten track spaced at least two tracks from the track being created by the first primary head, and wherein the second secondary head scans each overwritten track spaced at least two tracks from the track being created by the second primary head.
Claim 4
Dependent Claim
47 words
The invention of claim 1 wherein the first primary head and the first secondary head have the same azimuth, and wherein the second primary head and the second secondary head have each an azimuth opposite to the azimuth of the first head and the first secondary head.
Claim 5
Dependent Claim
82 words
The invention of claim 1 wherein the first and second primary heads are disposed in diametrically opposite positions and in the same axial position on the rotary drum, wherein the first and second secondary heads are disposed in diametrically opposite positions and in the same axial position on the rotary drum, and wherein the first and second primary heads are angularly spaced from about 88°50′ to about 90°00′ from the first and second secondary heads about the axis of the rotary drum.
Claim 6
Dependent Claim
43 words
The invention of claim 1 wherein the first and second secondary heads are so positioned on the rotary drum with respect to the first and second primary heads as to be in centerline alignment with the successive overwritten tracks on the magnetic tape.
Claim 7
Dependent Claim
29 words
The invention of claim 1 wherein the first and second secondary heads have a scanning width greater than the width of each overwritten record track on the magnetic tape.
Claim 8
Dependent Claim
32 words
The invention of claim 6 wherein the scanning width of the first and second secondary heads is the same as the scanning width of each of the first and second primary heads.
Claim 9
Dependent Claim
35 words
The invention of claim 7 wherein the scanning width of the first and second primary heads and the first and second secondary heads is not more than approximately twice the width of each overwritten track.
References Cited (Backward Citations)
No citation records indexed.
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