US2852617A - Magnet head - Google Patents

Magnet head Download PDF

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Publication number
US2852617A
US2852617A US481940A US48194055A US2852617A US 2852617 A US2852617 A US 2852617A US 481940 A US481940 A US 481940A US 48194055 A US48194055 A US 48194055A US 2852617 A US2852617 A US 2852617A
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United States
Prior art keywords
magnetic
gap
head
pole shoe
portions
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Expired - Lifetime
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US481940A
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Thiele Heinz
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Zeiss Ikon AG
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Zeiss Ikon AG
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Priority to US481940A priority Critical patent/US2852617A/en
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Publication of US2852617A publication Critical patent/US2852617A/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
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features

Definitions

  • the invention relates to improvements in magnetheads which consist of at least two ferro-magnetic plates positioned side by side and in which the pole shoe ends are spaced from each other apart by a non-magnetic foil having the thickness of the desired gap, whereby the pole shoes are facing each other with their largest surface area.
  • magnet heads among others, have the advantage that the wear caused on the pole shoes by the magnetic tape traveling transversely over the same does not cause any change in the width of the gap.
  • the pole shoes form namely a magnetic shunt which is of more or less influence, depending upon the size of the surface areas of the pole shoes which are spaced from each other by the intermediate layer of the non-magnetic foil.
  • Fig. 1 represents a pair of pole shoes of conventional construction which is embedded in a block of synthetic material as diagrammatically indicated, and
  • Fig. 2 shows a pair of pole shoes according to the invention.
  • a pair of pole shoe plates 1 2,852,617 which illustrates a magnet head of conventional construction
  • a pair of pole shoe plates 1 2,852,617 Patented Sept. 16, 1958 and 2, made of a pair of ferro-magnetic material, is embedded in a block 3 made of a plastic material.
  • the magnet head is excited by a coil 4 placed around the overlapping leg portions 8 and 9 of the plates 1 and 2.
  • the ferro-magnetic plates 1 and 2 face each other with their largest surface area and the non-magnetic gap is formed by thickness of a non-magnetic foil 5 which is placed between the pole shoe ends 6 and 7.
  • pole shoe plates 1a and 2a consisting of ferro-magnetic material again confront each other with their largest surface area and the pole shoe ends 61: and 7a are spaced apart from each other by a nonmagnetic foil 5a having the thickness of the desired gap 10.
  • each of said shoe ends in the zone of the gap is provided with a recess 10 and 11, respectively, which preferably extends at opposite sides of pole shoe ends and across the entire Width of the pole shoe ends and in close proximity of the face portions engaging the foil 5a and forming the gap.
  • a pair of ferro-magnetic core plates having leg portions provided with laterally extending foot and head portions, said core members being oppositely arranged with their foot and head portions in overlapping relation, the laterally extending head portions being spaced from each other to form a gap 'therebetween and the overlapping foot portions being arranged to form the core for a conductor winding, a non-magnetic foil of a thickness equal to the space of said gap mounted in said gap between said overlapping head portions, and the inner surfaces of said head portions being provided with V oppositely disposed grooves arranged adjacent said gap to extend parallel to the length thereof and across the entire Width of the head portions such as to decrease the surface areas of the head portions of the core members forming said gap.

Description

Sept. 16, 1958 H. THIELE MAGNET HEAD Filed Jan. 14, 1955 United States Patent 0 MAGNET HEAD Heinz Thiele, Kiel-Wik, Germany, assignor to Zeiss lkon A. G., Stuttgart, Germany Application January 14, 1955, Serial No. 481,940
1 Claim. (Cl. 179-1002) The invention relates to improvements in magnetheads which consist of at least two ferro-magnetic plates positioned side by side and in which the pole shoe ends are spaced from each other apart by a non-magnetic foil having the thickness of the desired gap, whereby the pole shoes are facing each other with their largest surface area. These magnet heads, among others, have the advantage that the wear caused on the pole shoes by the magnetic tape traveling transversely over the same does not cause any change in the width of the gap. Unfortunately, the magnetic efficiency of such head construction leaves much to be desired. The pole shoes form namely a magnetic shunt which is of more or less influence, depending upon the size of the surface areas of the pole shoes which are spaced from each other by the intermediate layer of the non-magnetic foil.
It is an object of the invention to reduce harmful shunt elfects and so improve the magnetic efficiency of magnet heads by recessing the pole shoe ends, with the exception of those end portions of the pole shoe located in direct proximity to the efiective gap-such that the produced greater space between the two pole shoe plates Will reduce the magnetic shunt to an extent which is no longer disturbing.
Other objects and advantages of the invention will become apparent from the following description taken together with the accompanying drawings, in which:
Fig. 1 represents a pair of pole shoes of conventional construction which is embedded in a block of synthetic material as diagrammatically indicated, and
Fig. 2 shows a pair of pole shoes according to the invention.
Referring to Fig. l which illustrates a magnet head of conventional construction, a pair of pole shoe plates 1 2,852,617. Patented Sept. 16, 1958 and 2, made of a pair of ferro-magnetic material, is embedded in a block 3 made of a plastic material. The magnet head is excited by a coil 4 placed around the overlapping leg portions 8 and 9 of the plates 1 and 2. The ferro-magnetic plates 1 and 2 face each other with their largest surface area and the non-magnetic gap is formed by thickness of a non-magnetic foil 5 which is placed between the pole shoe ends 6 and 7.
The magnetic head according to the present invention is shown in Fig. 2. Pole shoe plates 1a and 2a consisting of ferro-magnetic material again confront each other with their largest surface area and the pole shoe ends 61: and 7a are spaced apart from each other by a nonmagnetic foil 5a having the thickness of the desired gap 10.
In order to reduce or to eliminate any magnetic shunt action between the confronting faces of the pole shoe ends 6a and 7a, each of said shoe ends in the zone of the gap is provided with a recess 10 and 11, respectively, which preferably extends at opposite sides of pole shoe ends and across the entire Width of the pole shoe ends and in close proximity of the face portions engaging the foil 5a and forming the gap.
What I claim is:
In a magnetic head, a pair of ferro-magnetic core plates having leg portions provided with laterally extending foot and head portions, said core members being oppositely arranged with their foot and head portions in overlapping relation, the laterally extending head portions being spaced from each other to form a gap 'therebetween and the overlapping foot portions being arranged to form the core for a conductor winding, a non-magnetic foil of a thickness equal to the space of said gap mounted in said gap between said overlapping head portions, and the inner surfaces of said head portions being provided with V oppositely disposed grooves arranged adjacent said gap to extend parallel to the length thereof and across the entire Width of the head portions such as to decrease the surface areas of the head portions of the core members forming said gap.
References Cited in the file of this patent UNITED STATES PATENTS 2,711,945 Kornei .Iune 28, 1955
US481940A 1955-01-14 1955-01-14 Magnet head Expired - Lifetime US2852617A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961495A (en) * 1957-01-28 1960-11-22 Gen Precision Inc Magnetic transducer head
US3064088A (en) * 1959-01-20 1962-11-13 Telefonbau & Normalzeit Gmbh Electromagnetic transducer
US3718776A (en) * 1970-12-11 1973-02-27 Ibm Multi-track overlapped-gap magnetic head, assembly
JPS48103016U (en) * 1972-03-03 1973-12-03
JPS49134116U (en) * 1973-03-20 1974-11-18
US4100583A (en) * 1975-07-17 1978-07-11 U.S. Philips Corporation Thin-film magnetic head for reading and writing information
US4300177A (en) * 1975-07-17 1981-11-10 U.S. Philips Corporation Thin-film magnetic head for reading and writing information
US4849841A (en) * 1987-04-10 1989-07-18 Irwin Magnetic Systems, Inc. Transducer head core structure with recessed magnetic closures

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632816A (en) * 1951-03-26 1953-03-24 Stromberg Carlson Co Magnetic recording and reproducing head
US2650952A (en) * 1949-04-13 1953-09-01 Shure Bros Recording and reproducing head
US2711945A (en) * 1953-03-04 1955-06-28 Clevite Corp Magnetic transducer head for high frequency signals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650952A (en) * 1949-04-13 1953-09-01 Shure Bros Recording and reproducing head
US2632816A (en) * 1951-03-26 1953-03-24 Stromberg Carlson Co Magnetic recording and reproducing head
US2711945A (en) * 1953-03-04 1955-06-28 Clevite Corp Magnetic transducer head for high frequency signals

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961495A (en) * 1957-01-28 1960-11-22 Gen Precision Inc Magnetic transducer head
US3064088A (en) * 1959-01-20 1962-11-13 Telefonbau & Normalzeit Gmbh Electromagnetic transducer
US3718776A (en) * 1970-12-11 1973-02-27 Ibm Multi-track overlapped-gap magnetic head, assembly
JPS48103016U (en) * 1972-03-03 1973-12-03
JPS49134116U (en) * 1973-03-20 1974-11-18
US4100583A (en) * 1975-07-17 1978-07-11 U.S. Philips Corporation Thin-film magnetic head for reading and writing information
US4300177A (en) * 1975-07-17 1981-11-10 U.S. Philips Corporation Thin-film magnetic head for reading and writing information
US4849841A (en) * 1987-04-10 1989-07-18 Irwin Magnetic Systems, Inc. Transducer head core structure with recessed magnetic closures

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