JPS54126515A - Magnetic disc apparatus - Google Patents

Magnetic disc apparatus

Info

Publication number
JPS54126515A
JPS54126515A JP3382878A JP3382878A JPS54126515A JP S54126515 A JPS54126515 A JP S54126515A JP 3382878 A JP3382878 A JP 3382878A JP 3382878 A JP3382878 A JP 3382878A JP S54126515 A JPS54126515 A JP S54126515A
Authority
JP
Japan
Prior art keywords
speed
target
automatically
control mode
switch
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
JP3382878A
Other languages
Japanese (ja)
Other versions
JPS6117061B2 (en
Inventor
Kazuyoshi Nakabayashi
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.)
NIPPON SHIYUUHENKI KK
Fujitsu Ltd
Hitachi Ltd
Original Assignee
NIPPON SHIYUUHENKI KK
Fujitsu Ltd
Hitachi 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 NIPPON SHIYUUHENKI KK, Fujitsu Ltd, Hitachi Ltd filed Critical NIPPON SHIYUUHENKI KK
Priority to JP3382878A priority Critical patent/JPS54126515A/en
Publication of JPS54126515A publication Critical patent/JPS54126515A/en
Publication of JPS6117061B2 publication Critical patent/JPS6117061B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Position Or Direction (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

PURPOSE: To enable optimum access time to be automatically set by automatically regulating and holding the detection sensitivity of a speed detecting means so tht the speed of a head carriage becomes within an allowable range of the deviation from its target value.
CONSTITUTION: For moving of a servo head 2 to the target track on a servo disc 3 face, posioning controlling is accomplished in the speed control mode up to the neighborhood of the target as a switch SW1 is shifted to the (b) side and in the position control mode near the target as the switch SW1 is changed over to the (a) side. Further, a speed regulating circuit 12 which automatically regulates the gain of a speed detector 11 at the speed controlling is added. Hence, the sensitivity of the speed detector 11 is automatically regulated while the head carriage 1 is being run at an equal speed in the preparation operation period before shifting to acccess operation and therefore the variations in the detection sensitivity of each apparatus may be corrected and the optimum access time may be secured.
COPYRIGHT: (C)1979,JPO&Japio
JP3382878A 1978-03-24 1978-03-24 Magnetic disc apparatus Granted JPS54126515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3382878A JPS54126515A (en) 1978-03-24 1978-03-24 Magnetic disc apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3382878A JPS54126515A (en) 1978-03-24 1978-03-24 Magnetic disc apparatus

Publications (2)

Publication Number Publication Date
JPS54126515A true JPS54126515A (en) 1979-10-01
JPS6117061B2 JPS6117061B2 (en) 1986-05-06

Family

ID=12397339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3382878A Granted JPS54126515A (en) 1978-03-24 1978-03-24 Magnetic disc apparatus

Country Status (1)

Country Link
JP (1) JPS54126515A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS576901A (en) * 1980-05-08 1982-01-13 Storage Technology Corp Automatic constant band width gain controller
JPS60106082A (en) * 1983-11-14 1985-06-11 Nec Corp Magnetic disk device
JPH02183313A (en) * 1989-01-10 1990-07-17 Fujitsu Ltd Servo circuit
JPH02183312A (en) * 1989-01-10 1990-07-17 Fujitsu Ltd Servo positioning circuit
EP0378327A2 (en) * 1989-01-10 1990-07-18 Fujitsu Limited Automatic adjustment system for servo circuit of a magnetic disk apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS576901A (en) * 1980-05-08 1982-01-13 Storage Technology Corp Automatic constant band width gain controller
JPH027081B2 (en) * 1980-05-08 1990-02-15 Storage Technology Corp
JPS60106082A (en) * 1983-11-14 1985-06-11 Nec Corp Magnetic disk device
JPH0316713B2 (en) * 1983-11-14 1991-03-06 Nippon Electric Co
JPH02183313A (en) * 1989-01-10 1990-07-17 Fujitsu Ltd Servo circuit
JPH02183312A (en) * 1989-01-10 1990-07-17 Fujitsu Ltd Servo positioning circuit
EP0378327A2 (en) * 1989-01-10 1990-07-18 Fujitsu Limited Automatic adjustment system for servo circuit of a magnetic disk apparatus

Also Published As

Publication number Publication date
JPS6117061B2 (en) 1986-05-06

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