GB1494087A - Magnetic recording and reproducing transducers and methods of manufacture thereof - Google Patents

Magnetic recording and reproducing transducers and methods of manufacture thereof

Info

Publication number
GB1494087A
GB1494087A GB4681674A GB4681674A GB1494087A GB 1494087 A GB1494087 A GB 1494087A GB 4681674 A GB4681674 A GB 4681674A GB 4681674 A GB4681674 A GB 4681674A GB 1494087 A GB1494087 A GB 1494087A
Authority
GB
United Kingdom
Prior art keywords
magnetic
substrate
layers
core
winding
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
Application number
GB4681674A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Data Recording Instrument Co Ltd
Original Assignee
Data Recording Instrument Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Data Recording Instrument Co Ltd filed Critical Data Recording Instrument Co Ltd
Priority to GB4681674A priority Critical patent/GB1494087A/en
Publication of GB1494087A publication Critical patent/GB1494087A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
    • 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
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109—Details
    • G11B5/313—Disposition of layers

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Abstract

1494087 Magnetic heads DATA RECORDING INSTRUMENT CO Ltd 22 Oct 1975 [29 Oct 1974] 46816/74 Heading G5R [Also in Division H1] A magnetic recording and reproducing head comprises a substrate 3 having a magnetic part 4 and a non-magnetic part 5, a magnetic head core 7, 19 on the non-magnetic part 5 and having a transducing gap, a coupling winding 9 formed on the substrate 3 and extending through the transducing gap, at 15, and over the magnetic part 4, at 17, and a multilayer transformer winding 23, 26, 29, 32 formed on the magnetic part 4 and inductively coupled to the head core winding 9, 15, 17. The substrate 3 may comprise a ceramic part 5 glass bonded 6 to a magnetic ferrite part 4. The head unit 1 is formed by deposition on part 5 of magnetic Ni-Fe layers 7, 19, electrically insulating layers 8, 18 and an electrically conductive layer 9. A rear part of layer 19 contacts layer 7 to form a channel receiving a part 15 of conductor layer 9 which forms a single turn head coil having the part 17 on ferrite substrate part 4 coupled to a magnetic core 11 of the transformer 2. The multilayer transformer winding is formed by successive deposition of electrically insulating layers (not shown) alternating with electrically conductive layers 23, 26, 29, 32. Each of layers 23, 26, 29, 32 is formed as a rectangular multiturn spiral around limb 12 of transformer core 11, the spirals being connected in series with one another to form the transformer winding with a centre tap. In a modification, a second substrate carries part or all of core 11, e.g. the upper bridge part and portions of each limb 12, 13, and also carries winding layers 29, 32 and is positioned face-to-face with substrate 3 with the various depositions therebetween. The core 11 may be formed by arc plasma deposition and the layers 23, 26, 29, 32 may be thin films, formed by vacuum or sputter deposition or fired-on thick films; the transducer gap forming layer 9 may be about 2 micrometers thick. A common substrate may carry a plurality of heads and associated transformers to form a multi-track assembly.
GB4681674A 1975-10-22 1975-10-22 Magnetic recording and reproducing transducers and methods of manufacture thereof Expired GB1494087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4681674A GB1494087A (en) 1975-10-22 1975-10-22 Magnetic recording and reproducing transducers and methods of manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4681674A GB1494087A (en) 1975-10-22 1975-10-22 Magnetic recording and reproducing transducers and methods of manufacture thereof

Publications (1)

Publication Number Publication Date
GB1494087A true GB1494087A (en) 1977-12-07

Family

ID=10442698

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4681674A Expired GB1494087A (en) 1975-10-22 1975-10-22 Magnetic recording and reproducing transducers and methods of manufacture thereof

Country Status (1)

Country Link
GB (1) GB1494087A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491283A1 (en) * 1980-10-01 1982-04-02 Communications Patents Ltd PRINTED CIRCUIT TRANSFORMERS
WO1985000070A1 (en) * 1983-06-15 1985-01-03 Eastman Kodak Company Inductively-coupled, thin-film m-r head
US4547961A (en) * 1980-11-14 1985-10-22 Analog Devices, Incorporated Method of manufacture of miniaturized transformer
GB2173956A (en) * 1985-03-29 1986-10-22 Plessey Co Plc Integrated electrical transformer
EP0199522A2 (en) * 1985-04-18 1986-10-29 Matsushita Electric Industrial Co., Ltd. Step-up type magnetic head
US4873757A (en) * 1987-07-08 1989-10-17 The Foxboro Company Method of making a multilayer electrical coil
US4977491A (en) * 1986-10-15 1990-12-11 Electronique Serge Dassault High frequency transformer with a printed circuit winding in particular for a very high voltage power supply

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491283A1 (en) * 1980-10-01 1982-04-02 Communications Patents Ltd PRINTED CIRCUIT TRANSFORMERS
US4547961A (en) * 1980-11-14 1985-10-22 Analog Devices, Incorporated Method of manufacture of miniaturized transformer
WO1985000070A1 (en) * 1983-06-15 1985-01-03 Eastman Kodak Company Inductively-coupled, thin-film m-r head
GB2173956A (en) * 1985-03-29 1986-10-22 Plessey Co Plc Integrated electrical transformer
EP0199522A2 (en) * 1985-04-18 1986-10-29 Matsushita Electric Industrial Co., Ltd. Step-up type magnetic head
EP0199522A3 (en) * 1985-04-18 1988-06-08 Matsushita Electric Industrial Co., Ltd. Step-up type magnetic head
US4787003A (en) * 1985-04-18 1988-11-22 Matsushita Electric Industrial Co., Ltd. Step-up type magnetic head
US4977491A (en) * 1986-10-15 1990-12-11 Electronique Serge Dassault High frequency transformer with a printed circuit winding in particular for a very high voltage power supply
US4873757A (en) * 1987-07-08 1989-10-17 The Foxboro Company Method of making a multilayer electrical coil

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee