JPS55150120A - Automatic lapping unit for thin-film magnetic head - Google Patents

Automatic lapping unit for thin-film magnetic head

Info

Publication number
JPS55150120A
JPS55150120A JP5547979A JP5547979A JPS55150120A JP S55150120 A JPS55150120 A JP S55150120A JP 5547979 A JP5547979 A JP 5547979A JP 5547979 A JP5547979 A JP 5547979A JP S55150120 A JPS55150120 A JP S55150120A
Authority
JP
Japan
Prior art keywords
register
value
resistance
coefficient
resistance value
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.)
Pending
Application number
JP5547979A
Other languages
Japanese (ja)
Inventor
Akira Kakehi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5547979A priority Critical patent/JPS55150120A/en
Publication of JPS55150120A publication Critical patent/JPS55150120A/en
Pending 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
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
    • G11B5/3166—Testing or indicating in relation thereto, e.g. before the fabrication is completed

Landscapes

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

Abstract

PURPOSE:To exercise forecast control over lapping work easily and rapidly with needed work precision by using a digital arithmetic and memory circuit to calculate a coefficient, determining how much each rod should be lapped, and a resistance- value measurement result. CONSTITUTION:Coefficients which determine how much substrate rods should correspondingly be lapped are set in coefficient register 12. Before lapping work, the resistance value of a thin-film resistor is measured and the obtained value is converted by A/D converter 9 into a digital value, which is stored in register 12 as an initial resistance value. Next, the intial resistance value in register 12 is multiplied by a coefficient in coefficient register 13 by a multiplier in 14 and the product is stored in a result register in the same 14. In response to an operation start command from start indicator 10, switch 11 is changed from the register 12 side over to the resistance-value transmission line side and the resistance value is inputted to comparator 16, which compares it to the value of register 14 to output a forecast control command to lapping mechanism part 18. Consequently, a resistance measure ment error can be lessened and the work precision can easily be improved.
JP5547979A 1979-05-07 1979-05-07 Automatic lapping unit for thin-film magnetic head Pending JPS55150120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5547979A JPS55150120A (en) 1979-05-07 1979-05-07 Automatic lapping unit for thin-film magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5547979A JPS55150120A (en) 1979-05-07 1979-05-07 Automatic lapping unit for thin-film magnetic head

Publications (1)

Publication Number Publication Date
JPS55150120A true JPS55150120A (en) 1980-11-21

Family

ID=12999743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5547979A Pending JPS55150120A (en) 1979-05-07 1979-05-07 Automatic lapping unit for thin-film magnetic head

Country Status (1)

Country Link
JP (1) JPS55150120A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504831A2 (en) * 1991-03-22 1992-09-23 Read-Rite Corporation Throat height control during lapping of magnetic heads
US6217425B1 (en) 1998-06-12 2001-04-17 Tdk Corporation Apparatus and method for lapping magnetic heads
US6565414B2 (en) 1999-10-25 2003-05-20 Tdk Corporation Polishing apparatus for magnetic head and method therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4974519A (en) * 1972-10-11 1974-07-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4974519A (en) * 1972-10-11 1974-07-18

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504831A2 (en) * 1991-03-22 1992-09-23 Read-Rite Corporation Throat height control during lapping of magnetic heads
US6217425B1 (en) 1998-06-12 2001-04-17 Tdk Corporation Apparatus and method for lapping magnetic heads
US6565414B2 (en) 1999-10-25 2003-05-20 Tdk Corporation Polishing apparatus for magnetic head and method therefor

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