US3678576A - Method of manufacturing multiple track, single gap magnetic heads - Google Patents

Method of manufacturing multiple track, single gap magnetic heads Download PDF

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Publication number
US3678576A
US3678576A US156809A US3678576DA US3678576A US 3678576 A US3678576 A US 3678576A US 156809 A US156809 A US 156809A US 3678576D A US3678576D A US 3678576DA US 3678576 A US3678576 A US 3678576A
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US
United States
Prior art keywords
core
face
housing
portions
elongate
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
US156809A
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English (en)
Inventor
Richard E Braun
Lionel G Hopkins
Neil J Sheehan
Edward J Sanchez
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.)
Magnetic Head Corp
Original Assignee
Magnetic Head Corp
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 Magnetic Head Corp filed Critical Magnetic Head Corp
Application granted granted Critical
Publication of US3678576A publication Critical patent/US3678576A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track
    • G11B5/295—Manufacture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/49036—Fabricating head structure or component thereof including measuring or testing
    • Y10T29/49041—Fabricating head structure or component thereof including measuring or testing with significant slider/housing shaping or treating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/49055—Fabricating head structure or component thereof with bond/laminating preformed parts, at least two magnetic
    • Y10T29/49059—Fabricating head structure or component thereof with bond/laminating preformed parts, at least two magnetic with work positioning means

Definitions

  • the core sections assembled with one of the housing sections are wound with a transducing coil and are termed the active core sections while the core sections assembled with the other housing section simply provide a return path and are referred to as the inactive core sections.
  • both the core sections may be wound or active sections.
  • 3,417,465 is the fact that only half the number of cores and housings need be handled during the initial assembly stages and, even in the final assembly stages, only two housing sub-assemblies, which sub-assemblies include the previously assembled core sections, need be handled to produce a single magnetic head. This not only reduces manufacturing costs but makes possible the attainment of much closer manufacturing tolerances, since, among other reasons, both housing sections may be machined in a single pass.
  • the instant invention constitutes an improvement over the method disclosed in U.S. Pat No. 3,417,465 primarily in that only two housing sub-assemblies are required to be worked or handled in the production of two complete magnetic heads as opposed to the required handling of two sub-assemblies in the production of a single magnetic head as described in the aforesaid patent.
  • the end-for-end reversal technique is critical to the practice of the invention in the more usual case where the elongate combination core comprises both active and inactive sections. This for the reason that it is necessary that corresponding active and inactive sections be paired during the assembly of the elongate composite head assembly prior to its division.
  • FIG. 1 is a perspective view illustrating the assembly of a plurality of compound cores with a pair of elongate housing members;
  • FIG. 2 is an exploded perspective illustrating the manner in which the elongate housing assemblies are joined to form an elongate composite head assembly
  • FIG. 3 is a schematic illustration of the separation of a composite head assembly to produce a pair of multiple track, single gap magnetic heads.
  • a pair of elongate, compound housing members 10, 12 may, if desired, be aligned generally after the manner shown in FIG. I for the machining of the nine core receiving recesses 14 and the horizontal alignment slot 16 in a single pass.
  • a plurali ty of elongate, compound cores 18, including a previously wrapped active core portion 20 and a return core section 22 separated by a vertical alignment slot 24, are then assembled with each housing section and mutually aligned therein by the positionment of a vertical alignment pin, not shown, lying across the vertical alignment slot 26 formed in each housing member I0, 12 and engaging the vertical alignment slots 24 in the various compound cores 18.
  • the active core section assumes the shape of a C core which has been previously wound with the transducing coil 28 in a conventional manner while the inactive core section is depicted as a simple 1" core.
  • Each compound core 18 is positioned in its individual housing recess 14 as illustrated by the dashed assembly lines associated with housing 10 in FIG. 1. Following the assembly of all nine compound cores with their respective housing members, a vertical alignment pin, not shown, is used to align the cores as illustrated by the completed core assembly with housing 12 in FIG. 1.
  • a plurality of male connectors are interconnected with transducer coils 28 and positioned in recesses 30 prior to the usual potting operation. The potting material and connector pins have been omitted from the drawing for clarity of illustration.
  • housing members are ground or lapped before being placed in face-to-face engagement in an end-forend reversed position as indicated by the arrow 32 in FIG. 1 following the positionment of a desired shim material, not shown, adjacent the pole tips 34 of each active core section 20 to define the necessary air gap between the pole tips and those ends of the associated I cores with which they will be related in the composite head assembly 36 indicated in FIG. 2.
  • a horizontal alignment key 38 positioned as indicated in FIG.
  • each compound core 18 in each housing member is precisely aligned with another compound core in the other housing section while the end-for-end reversal of the housing members insures that a magnetic circuit path, including an air gap, is defined by each C" core in one housing section in conjunction with an I core in the other housing section as will be apparent from an inspection of FIGS. 1 and 2.
  • the housing members l0, 12 may be joined together in the composite head assembly in any conventional manner, such as by threaded fasteners (not shown), following which time the composite head assembly is divided, such as by parallel sawcuts 40 as indicated in FIG. 3, to produce two complete multiple track, single gap magnetic heads each of whose air gaps are adjacent the saw-cut portions.
  • a method of manufacturing multiple track, single gap magnetic heads comprising; providing a plurality of elongate, magnetic core members, each said member having first and second core portions spaced along the longitudinal axis thereof; providing a winding on each of said first portions, assembling a like number of similar members with each of two identical, elongate housings; joining the housing assemblies in face-to-face engagement with the first core portions of each housing assembly defining individual magnetic circuits, including transducing gaps, with the second core portions of the other housing assembly; and dividing the joined housing assemblies substantially perpendicular to the plane of their faceto-face engagement at a position intermediate the first and second portions of the core members to produce two single gap magnetic heads.
  • step of joining the housing assemblies in face-to-face engagement includes an end-for-end reversal of the housing assemblies prior to the face-to-face joining thereof.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
US156809A 1971-06-25 1971-06-25 Method of manufacturing multiple track, single gap magnetic heads Expired - Lifetime US3678576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15680971A 1971-06-25 1971-06-25

Publications (1)

Publication Number Publication Date
US3678576A true US3678576A (en) 1972-07-25

Family

ID=22561180

Family Applications (1)

Application Number Title Priority Date Filing Date
US156809A Expired - Lifetime US3678576A (en) 1971-06-25 1971-06-25 Method of manufacturing multiple track, single gap magnetic heads

Country Status (7)

Country Link
US (1) US3678576A (fr)
JP (1) JPS5213736B1 (fr)
BE (1) BE786701A (fr)
DE (1) DE2227372A1 (fr)
FR (1) FR2143016A1 (fr)
GB (1) GB1355741A (fr)
NL (1) NL7208135A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737992A (en) * 1972-06-09 1973-06-12 Magnetic Head Corp Method of manufacturing multiple track, dual gap magnetic heads
FR2588989A1 (fr) * 1985-10-23 1987-04-24 Bull Sa Procede pour fabriquer un transducteur magnetique comportant plusieurs tetes
US6550093B1 (en) 1999-02-03 2003-04-22 Yoshihiko Shioda Golf ball cleaning device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3117799B1 (fr) 2020-12-18 2022-12-09 Oreal Composition comprenant des gélifiants aqueux, un tensioactif, des huiles, des charges et de l’acide ascorbique
FR3117803B1 (fr) 2020-12-18 2022-12-09 Oreal Composition comprenant des gélifiants aqueux, un tensioactif et de l’acide ascorbique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249987A (en) * 1961-03-30 1966-05-10 Philips Corp Method of manufacturing magnetic heads
US3417465A (en) * 1964-05-19 1968-12-24 Minnesota Mining & Mfg Method of making laminated magnetic head
US3475815A (en) * 1968-05-13 1969-11-04 Hewlett Packard Co Method of making an electromagnetic transducer
US3534470A (en) * 1968-01-04 1970-10-20 Ibm Process for assembling magnetic tape heads using a consumable fixture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249987A (en) * 1961-03-30 1966-05-10 Philips Corp Method of manufacturing magnetic heads
US3417465A (en) * 1964-05-19 1968-12-24 Minnesota Mining & Mfg Method of making laminated magnetic head
US3534470A (en) * 1968-01-04 1970-10-20 Ibm Process for assembling magnetic tape heads using a consumable fixture
US3475815A (en) * 1968-05-13 1969-11-04 Hewlett Packard Co Method of making an electromagnetic transducer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737992A (en) * 1972-06-09 1973-06-12 Magnetic Head Corp Method of manufacturing multiple track, dual gap magnetic heads
FR2588989A1 (fr) * 1985-10-23 1987-04-24 Bull Sa Procede pour fabriquer un transducteur magnetique comportant plusieurs tetes
EP0224403A1 (fr) * 1985-10-23 1987-06-03 Bull S.A. Procédé pour fabriquer un transducteur magnétique comportant plusieurs têtes
US4736210A (en) * 1985-10-23 1988-04-05 Bull S.A. Magnetic transducer including a plurality of heads and method for producing the magnetic transducer
US6550093B1 (en) 1999-02-03 2003-04-22 Yoshihiko Shioda Golf ball cleaning device

Also Published As

Publication number Publication date
NL7208135A (fr) 1972-12-28
GB1355741A (en) 1974-06-05
FR2143016A1 (fr) 1973-02-02
JPS5213736B1 (fr) 1977-04-16
DE2227372A1 (de) 1972-12-28
BE786701A (fr) 1972-11-16

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