US3535466A - High efficiency single turn magnetic head - Google Patents

High efficiency single turn magnetic head Download PDF

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Publication number
US3535466A
US3535466A US685354A US3535466DA US3535466A US 3535466 A US3535466 A US 3535466A US 685354 A US685354 A US 685354A US 3535466D A US3535466D A US 3535466DA US 3535466 A US3535466 A US 3535466A
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United States
Prior art keywords
pole pieces
magnetic
single turn
gap
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US685354A
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English (en)
Inventor
Allen J Foster
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RCA Corp
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RCA Corp
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Publication date
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Publication of US3535466A publication Critical patent/US3535466A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/17—Construction or disposition of windings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10—Structure or manufacture of housings or shields for heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive

Definitions

  • the transducer comprises a single turn of wire mounted through the gap between independent pole pieces which are separated by a non-magnetic spacer.
  • the single turn links a high efliciency magnetic toroidal transformer which is an integral part of the transducer for providing appropriate operating signal levels.
  • the whole assembly is mounted in and supported by a pair of clamping blocks which can be secured together by a pressure screw.
  • a further object is to provide an improved single turn magnetic head in which the dimensions of the single turn are not restricted by the gap size.
  • Still a further object is to provide an improved magnetic head transducer having minimal lead inductance, a minimum susceptance to secondary gap effects and wherein stray field pick-up is virtually eliminated.
  • This path comprises the proximate portions of the juxtaposition pole pieces, a single turn disposed through the pole pieces and the portion of the recording medium adjacent to the gap formed by the pole pieces.
  • This compactness of the magnetic circuit is due to the skin effect in the magnetically separated pole pieces at high frequencies which sets up eddy currents in the extremes of the pole pieces thereby containing the magnetic lines to the gap vicinity.
  • the resultant efficiency of the magnetic circuit permits the use of a pole piece material which is less eflicient magnetically but more resistant to wear.
  • the single turn also links a toroid of high efficiency magnetic material having an independent multiple turn secondary 3,535,466 Patented Oct.
  • FIG. 1 is a view of a magnetic head according to one embodiment of this invention.
  • FIG. 2a-b are views of a magnetic head according to another embodiment of this invention.
  • FIG. 3 is an expanded view of one portion of the head of FIG. 2.
  • FIG. 4 is an expanded sectional view of another portion of the head of FIG. 2.
  • FIG. 1 shows a magnetic transducer comprising a pair of separate magnetic pole pieces 3 and 4 mounted in a pair of C-shaped non-magnetic clamping blocks 1 and 2.
  • the pole pieces 3 and 4 are preferably constructed from a material such as Alefcon whose characteristics are a compromise between high magnetic efiiciency and good wear resistance. However, the pole pieces 3 and 4 may also be formed from a ferrite material.
  • Clamping blocks 1 and 2 are preferably made of a hard non-magnetic material such as brass and contain slots 17 and 18 respectively in which are mounted pole pieces 3 and 4.
  • Each of the pole pieces 3 and 4 contain a groove therethrough in the abutting pole faces which together form the aperture 12 having a diameter of approximately .005 inch.
  • An insulating layer of Silicon Monoxide of approximate thickness of 50 micro inches is disposed between the abutting faces of pole pieces 3 and 4 to form the working gap 13,
  • the surfaces 14 and 16 of the pole pieces and the plane of joinder 15 of the clamping blocks are similarly covered with a layer of Silicon Monoxide.
  • a single closed turn 6 of electrically conductive material such as copper, silver or gold passes through aperture 12 formed at the gap 13 between pole pieces 3 and 4.
  • the single turn 6 further couples to a toroidal core '5 of high magnetic permeability such as ferrite, which is disposed within the opening of the C-shaped clamping blocks 1 and 2.
  • a multiple turn winding 7 of the material used for single turn 6 is also wound about toroid core 5 to provide proper signal transformation to and from the working gap 13 of the head.
  • a channel 9 is provided in clamping block 2 through which the leads of winding 7 are coupled to terminals 11 of the recessed terminal board 10.
  • a potting compound 8 such as Hysol cement is provided which fills the open spaces between clamping blocks 1 and 2, the channel 9 and covers recessed terminal board 10.
  • FIG. 2a a view of a magnetic transducer according to another embodiment of the invention.
  • the structure, material and mode of operation of this transducer are identical to that of FIG. 1 with the exception of the single turn 20*.
  • the single turn 20 of FIG. 2a is passed about core 5 and through aperture 12 in the form of a figure eight as contrasted with the elliptical shape of the single turn 6 of FIG. 1.
  • This figure eight configuration affords increased inductive coupling in the magnetic circuit of the transducer.
  • FIG. 2a also shows more clearly the details of the transducer structure including pressure screw 21 which engages the threaded aperture 22 of clamping block 1 to hold the head assembly together.
  • FIG. 2b is an end view of the transducer of FIG. 2a
  • FIG. 3 is an expanded view of the working gap area of the transducer of FIG. 2 showing the structural interrelation of the pole pieces 3 and 4 with the single turn 20, toroid 5 and its multiple winding 7.
  • FIG. 4 is an enlarged sectional view along the section line 44 of FIG. 2a which more clearly shows how the figure eight single turn winding is disposed about toroid 5 and through the aperture 12 at the gap face of pole piece 4.
  • a magnetic transducer head comprising:
  • a toroidal core member of magnetically permeable material disposed within said opening formed by said pole pieces and said clamping blocks, said core member being substantially coplanar with said pole pieces and physically separate from said pole pieces;
  • said insulating means comprises a layer of silicon monoxide material.
  • said closed loop electrical conductor is in the form of an ellipse.
  • said closed loop electrical conductor is in the form of a figure eight.
  • a magnetic transducer comprising; a pair of pole pieces each having first and second portions forming an obtuse angle, each of said first portions having a groove therethrough and across the width thereof, a pair of generally C-shaped clamping blocks of non-magnetic material, each of said blocks having a slot therein for receiving the second portions of said pole pieces to maintain said first portions in abutting relation with a gap therebetween, said grooves forming an aperture through said pole pieces at said gap, the center axis of said aperture being parallel to said gap formed by said pole pieces, a layer of first insulating material disposed in said gap on the abutting surfaces of said pole pieces including said grooves, a toroidal core member of magnetically permeable material disposed within an opening formed by the edges of said pole pieces and said blocks, said core member bein gsubstantially coplanar with said pole pieces, and physically separate from said pole pieces, a single unitary closed loop electrical conductor passing about said toroidal core and through said aperture, one of said blocks having a

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
  • Coils Or Transformers For Communication (AREA)
US685354A 1967-11-24 1967-11-24 High efficiency single turn magnetic head Expired - Lifetime US3535466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68535467A 1967-11-24 1967-11-24

Publications (1)

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US3535466A true US3535466A (en) 1970-10-20

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Family Applications (1)

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US685354A Expired - Lifetime US3535466A (en) 1967-11-24 1967-11-24 High efficiency single turn magnetic head

Country Status (4)

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US (1) US3535466A (de)
DE (1) DE1807658A1 (de)
FR (1) FR1594832A (de)
GB (1) GB1243221A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660617A (en) * 1969-12-29 1972-05-02 Ibm Low profile single-turn magnetic recording head with read/write winding coupled to single turn winding
US4191982A (en) * 1978-07-24 1980-03-04 Magnetic Peripherals Inc. Magnetic transducing head with a turn in the gap
US4240121A (en) * 1978-02-02 1980-12-16 Robert Bosch Gmbh Broadband magnetic tape transducer head
US4314298A (en) * 1979-10-09 1982-02-02 Eastman Technology, Inc. Multitrack magnetic head employing double helix structure
US4316227A (en) * 1979-10-09 1982-02-16 Eastman Technology, Inc. Multitrack magnetic head employing double helix structure
EP0046662A1 (de) * 1980-08-25 1982-03-03 Matsushita Electric Industrial Co., Ltd. Magnetischer Wandler mit eingebautem Spannungswandler
US4593333A (en) * 1982-01-18 1986-06-03 Canon Kabushiki Kaisha Magnetic head
US9697852B2 (en) 2015-11-06 2017-07-04 Seagate Technology Llc Single coil turn data writer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591070A (en) * 1947-04-17 1952-04-01 Indiana Steel Products Co Combined magnetic transducer head and output transformer
US2838614A (en) * 1952-05-12 1958-06-10 North American Aviation Inc Magnetic recording head
US2854525A (en) * 1954-07-19 1958-09-30 Ibm Magnetic transducer
US3249927A (en) * 1961-02-13 1966-05-03 Monroe Int Transducer method and apparatus
US3378647A (en) * 1963-06-05 1968-04-16 Victor Company Of Japan Magnetic head with removable head tip assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591070A (en) * 1947-04-17 1952-04-01 Indiana Steel Products Co Combined magnetic transducer head and output transformer
US2838614A (en) * 1952-05-12 1958-06-10 North American Aviation Inc Magnetic recording head
US2854525A (en) * 1954-07-19 1958-09-30 Ibm Magnetic transducer
US3249927A (en) * 1961-02-13 1966-05-03 Monroe Int Transducer method and apparatus
US3378647A (en) * 1963-06-05 1968-04-16 Victor Company Of Japan Magnetic head with removable head tip assembly
US3443040A (en) * 1963-06-05 1969-05-06 Victor Company Of Japan Magnetic transducer head with single turn winding of selfhardening material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660617A (en) * 1969-12-29 1972-05-02 Ibm Low profile single-turn magnetic recording head with read/write winding coupled to single turn winding
US4240121A (en) * 1978-02-02 1980-12-16 Robert Bosch Gmbh Broadband magnetic tape transducer head
US4191982A (en) * 1978-07-24 1980-03-04 Magnetic Peripherals Inc. Magnetic transducing head with a turn in the gap
US4314298A (en) * 1979-10-09 1982-02-02 Eastman Technology, Inc. Multitrack magnetic head employing double helix structure
US4316227A (en) * 1979-10-09 1982-02-16 Eastman Technology, Inc. Multitrack magnetic head employing double helix structure
EP0046662A1 (de) * 1980-08-25 1982-03-03 Matsushita Electric Industrial Co., Ltd. Magnetischer Wandler mit eingebautem Spannungswandler
US4593333A (en) * 1982-01-18 1986-06-03 Canon Kabushiki Kaisha Magnetic head
US9697852B2 (en) 2015-11-06 2017-07-04 Seagate Technology Llc Single coil turn data writer

Also Published As

Publication number Publication date
FR1594832A (de) 1970-06-08
DE1807658A1 (de) 1969-12-04
GB1243221A (en) 1971-08-18

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