FR2373819A1 - Head positioning system for magnetic disc unit - has compensation for length variations due to humidity and temperature variations - Google Patents

Head positioning system for magnetic disc unit - has compensation for length variations due to humidity and temperature variations

Info

Publication number
FR2373819A1
FR2373819A1 FR7734787A FR7734787A FR2373819A1 FR 2373819 A1 FR2373819 A1 FR 2373819A1 FR 7734787 A FR7734787 A FR 7734787A FR 7734787 A FR7734787 A FR 7734787A FR 2373819 A1 FR2373819 A1 FR 2373819A1
Authority
FR
France
Prior art keywords
humidity
magnetic disc
positioning system
compensation
positioning
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.)
Granted
Application number
FR7734787A
Other languages
French (fr)
Other versions
FR2373819B1 (en
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.)
Unisys Corp
Original Assignee
Burroughs 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
Priority claimed from GB51340/76A external-priority patent/GB1516239A/en
Application filed by Burroughs Corp filed Critical Burroughs Corp
Publication of FR2373819A1 publication Critical patent/FR2373819A1/en
Application granted granted Critical
Publication of FR2373819B1 publication Critical patent/FR2373819B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • G05B19/40—Open loop systems, e.g. using stepping motor
    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5565—Track change, selection or acquisition by displacement of the head across disk tracks system adaptation for compensation of variations of physical parameters, e.g. temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

The positioning system is used for the magnetic head (4) in a magnetic disc unit, for aligning the head with a reference track (X0, X1) and compensating for dimensional variations caused by variations in the temperature and humidity. A reception circuit (12) supplies a positioning command signals, supplied to a calculation unit (14). The latter receives the output from a device (16) which measures the dimensional variations, for providing a corrected positioning signal in accordance with the latter, supplied to the positioning means (10) for the head (4). The calculation unit (14) may employ a gradient signal representing the linear variation of the error over a given distance to obtain the error correction for the positioning signal.
FR7734787A 1976-12-09 1977-11-18 Head positioning system for magnetic disc unit - has compensation for length variations due to humidity and temperature variations Granted FR2373819A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB51340/76A GB1516239A (en) 1976-12-09 1976-12-09 Positioning system and method particularly useful for magnetic disc drives
US05/810,447 US4122503A (en) 1976-12-09 1977-06-27 Positioning system and method particularly useful for magnetic disk drives

Publications (2)

Publication Number Publication Date
FR2373819A1 true FR2373819A1 (en) 1978-07-07
FR2373819B1 FR2373819B1 (en) 1981-06-19

Family

ID=26266844

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7734787A Granted FR2373819A1 (en) 1976-12-09 1977-11-18 Head positioning system for magnetic disc unit - has compensation for length variations due to humidity and temperature variations

Country Status (1)

Country Link
FR (1) FR2373819A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021968A1 (en) * 1979-06-15 1981-01-07 Societe D'etudes Recherches Et Constructions Electroniques Sercel Precision positioning machine with toothed drive belt and tooth-pitch error compensation
EP0069549A1 (en) * 1981-07-02 1983-01-12 Irwin International, Inc. Method of positioning a transducer over a disc
EP0077970B1 (en) * 1981-10-23 1985-04-10 Siemens Aktiengesellschaft Automatic deflexion unit characteristic adjusting appliance
EP0227061A2 (en) * 1985-12-19 1987-07-01 Victor Company Of Japan, Limited Disk drive apparatus providing increased track density
EP0238318A2 (en) * 1986-03-19 1987-09-23 Fujitsu Limited Track access control system for magnetic disk system
FR2614448A1 (en) * 1987-04-23 1988-10-28 Logilift Sarl METHOD FOR CONTROLLING THE ROTATION SPEED OF AN ELECTRIC MOTOR, MEANS EMPLOYING THE METHOD, AND MOTORS PROVIDED WITH SAID MEANS
EP0295015A2 (en) * 1987-06-06 1988-12-14 Fujitsu Limited Track access control system for magnetic disk apparatus
EP0335546A2 (en) * 1988-03-28 1989-10-04 Seagate Technology International Off-set nulling system and method for computer disk drives
EP0522597A2 (en) * 1985-11-20 1993-01-13 Seagate Technology, Inc. Methods of monitoring operating temperatures in disc drives to prevent thermal mistracking
EP0574637A1 (en) * 1992-06-19 1993-12-22 EURO CP s.a.r.l. Method for the control of a movable part of an operating unit and operating unit for its realisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757189A (en) * 1972-12-29 1973-09-04 Century Data Systems Inc Temperature compensation for positioning system
FR2188228A1 (en) * 1972-06-05 1974-01-18 Control Data Corp
FR2279188A1 (en) * 1974-07-18 1976-02-13 Basf Ag METHOD AND CONTROL DEVICE FOR COMPENSATION OF TEMPERATURE VARIATIONS IN A MAGNETIC DISC MEMORY MECHANISM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2188228A1 (en) * 1972-06-05 1974-01-18 Control Data Corp
US3757189A (en) * 1972-12-29 1973-09-04 Century Data Systems Inc Temperature compensation for positioning system
FR2279188A1 (en) * 1974-07-18 1976-02-13 Basf Ag METHOD AND CONTROL DEVICE FOR COMPENSATION OF TEMPERATURE VARIATIONS IN A MAGNETIC DISC MEMORY MECHANISM

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NV700/76 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021968A1 (en) * 1979-06-15 1981-01-07 Societe D'etudes Recherches Et Constructions Electroniques Sercel Precision positioning machine with toothed drive belt and tooth-pitch error compensation
EP0069549A1 (en) * 1981-07-02 1983-01-12 Irwin International, Inc. Method of positioning a transducer over a disc
EP0077970B1 (en) * 1981-10-23 1985-04-10 Siemens Aktiengesellschaft Automatic deflexion unit characteristic adjusting appliance
EP0522597A2 (en) * 1985-11-20 1993-01-13 Seagate Technology, Inc. Methods of monitoring operating temperatures in disc drives to prevent thermal mistracking
EP0522597A3 (en) * 1985-11-20 1994-07-20 Seagate Technology Methods of monitoring operating temperatures in disc drives to prevent thermal mistracking
EP0227061A2 (en) * 1985-12-19 1987-07-01 Victor Company Of Japan, Limited Disk drive apparatus providing increased track density
EP0227061A3 (en) * 1985-12-19 1988-10-12 Victor Company Of Japan, Limited Disk drive apparatus providing increased track density
EP0238318A2 (en) * 1986-03-19 1987-09-23 Fujitsu Limited Track access control system for magnetic disk system
EP0238318A3 (en) * 1986-03-19 1989-05-31 Fujitsu Limited Track access control system for magnetic disk system
FR2614448A1 (en) * 1987-04-23 1988-10-28 Logilift Sarl METHOD FOR CONTROLLING THE ROTATION SPEED OF AN ELECTRIC MOTOR, MEANS EMPLOYING THE METHOD, AND MOTORS PROVIDED WITH SAID MEANS
WO1988008477A1 (en) * 1987-04-23 1988-11-03 Logilift Sarl Process for regulating the speed of rotation of an electric motor
EP0295015A2 (en) * 1987-06-06 1988-12-14 Fujitsu Limited Track access control system for magnetic disk apparatus
EP0295015A3 (en) * 1987-06-06 1989-05-31 Fujitsu Limited Track access control system for magnetic disk apparatus
EP0335546A3 (en) * 1988-03-28 1990-11-22 Seagate Technology International Off-set nulling system and method for computer disk drives
EP0335546A2 (en) * 1988-03-28 1989-10-04 Seagate Technology International Off-set nulling system and method for computer disk drives
EP0574637A1 (en) * 1992-06-19 1993-12-22 EURO CP s.a.r.l. Method for the control of a movable part of an operating unit and operating unit for its realisation

Also Published As

Publication number Publication date
FR2373819B1 (en) 1981-06-19

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