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US4408240A Expired / Lapsed US ⏱️ 0.0 years remaining

Multichannel magnetic head for a recorder-reproducer system

Assignee: RCA Corp
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Filing: 1981-08-06
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Granted: 1983-10-04
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Expires: 2001-08-06
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Abstract

Abstract In a multichannel head of the type wherein a plurality of transducers scan signal tracks of information across a magnetic tape within a system; and wherein each transducer includes a magnetic core having two pole pieces between which a gap is disposed while at least one turn of a conductor is magnetically coupled to the gap, the plurality of transducers are sequentially bonded together in an integral unit with their gaps disposed at essentially tandem locations.

Inventors

  • 👤 David C. Pastore

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 08:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/187; G11B5/1871; G11B5/48; G11B5/49; G11B5/4969; G11B5/52; G11B5/53; G11B5/531

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 257 words
A multichannel magnetic transducer head arrangement for transducing parallel tape tracks in a video tape recorder, comprising: a plurality of individual transducers, each transducer including first and second magnetic pole pieces, said first and second pole pieces defining a block with first and second parallel sides having a predetermined width and also defining a face substantially orthogonal to said first and second sides, said face being adapted for operative contact with magnetic tape, said first and second pole pieces defining said face being separated by a magnetic gap in said face, said gap lying in a plane substantially parallel with said first and second sides and having a width equal to that of said width of said pole pieces, the length of said gap being small over a predetermined portion of the width of said pole pieces and gradually becoming larger over at least a portion of the remainder of said width, each of said plurality of transducers having said small portion of said gap along a different portion of said width; and nonmagnetic bonding means for mechanically bonding together said plurality of individual transducers along adjacent ones of said parallel sides with said faces of said transducers lying substantially in the same plane and with said gaps lying in parallel planes, said bonding means producing magnetic isolation between the pole pieces of adjacent transducers for reducing crosstalk between said transducers whereby said small portion of each of said gaps can scan across a different lateral portion of said tape with substantially no separation between said tracks.
Claim 2
Dependent Claim 257 words
A multichannel magnetic transducer head arrangement for transducing parallel tape tracks in a video tape recorder, comprising: a plurality of individual transducers, each transducer including first and second magnetic pole pieces, said first and second pole pieces defining a block with first and second parallel sides having a predetermined width and also defining a face substantially orthogonal to said first and second sides, said face being adapted for operative contact with magnetic tape, said first and second pole pieces defining said face being separated by a magnetic gap in said face, said gap lying in a plane substantially parallel with said first and second sides and having a width equal to that of said width of said pole pieces, the length of said gap being small over a predetermined portion of the width of said pole pieces and gradually becoming larger over at least a portion of the remainder of said width, each of said plurality of transducers having said small portion of said gap along a different portion of said width; and nonmagnetic bonding means for mechanically bonding together said plurality of individual transducers along adjacent ones of said parallel sides with said faces of said transducers lying substantially in the same plane and with said gaps lying in parallel planes, said bonding means producing magnetic isolation between the pole pieces of adjacent transducers for reducing crosstalk between said transducers whereby said small portion of each of said gaps can scan across a different lateral portion of said tape with substantially no separation between said tracks.
Claim 3
Dependent Claim 218 words
A multichannel magnetic transducer head arrangement for transducing parallel tape tracks in a video tape recorder, comprising: a plurality of individual transducers, each transducer including first and second magnetic pole pieces, said first and second pole pieces defining a block with first and second parallel sides having a predetermined width and also defining a face substantially orthogonal to said first and second sides, said face being adapted for operative contact with magnetic tape, said first and second pole pieces defining said face being separated by a magnetic gap in said face, said gap lying in a plane substantially parallel with said first and second sides and having a width equal to that of said width of said pole pieces, the length of said gap being small over a predetermined portion of the width of said pole pieces and gradually becoming larger over at least a portion of the remainder of said width, each of said plurality of transducers having said small portion of said gap along a different portion of said width; and means for mechanically positioning said plurality of individual transducers side-by-side with said gaps aligned in tandem for scanning said tape and with adjacent transducers effectively magnetically decoupled whereby the small portion of each gap scans a different portion of said tape and crosstalk is reduced.
Claim 4
Dependent Claim 218 words
A multichannel magnetic transducer head arrangement for transducing parallel tape tracks in a video tape recorder, comprising: a plurality of individual transducers, each transducer including first and second magnetic pole pieces, said first and second pole pieces defining a block with first and second parallel sides having a predetermined width and also defining a face substantially orthogonal to said first and second sides, said face being adapted for operative contact with magnetic tape, said first and second pole pieces defining said face being separated by a magnetic gap in said face, said gap lying in a plane substantially parallel with said first and second sides and having a width equal to that of said width of said pole pieces, the length of said gap being small over a predetermined portion of the width of said pole pieces and gradually becoming larger over at least a portion of the remainder of said width, each of said plurality of transducers having said small portion of said gap along a different portion of said width; and means for mechanically positioning said plurality of individual transducers side-by-side with said gaps aligned in tandem for scanning said tape and with adjacent transducers effectively magnetically decoupled whereby the small portion of each gap scans a different portion of said tape and crosstalk is reduced.

References Cited (Backward Citations)

US3549822A Cited
US3978523A Cited
DE2065746A1 Cited
US3716677A Cited
DE2218969A1 Cited
US4110902A Cited
US4318146A Cited
GB2039126B Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-10-03 1987-04-04 1987-10-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-10-03 1991-04-04 1991-10-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-10-03 1995-04-04 1995-10-04 $7700.00 Window Closed / Lapsed

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