JPS5473515A - Magnetic recording/reproducing system - Google Patents

Magnetic recording/reproducing system

Info

Publication number
JPS5473515A
JPS5473515A JP14004377A JP14004377A JPS5473515A JP S5473515 A JPS5473515 A JP S5473515A JP 14004377 A JP14004377 A JP 14004377A JP 14004377 A JP14004377 A JP 14004377A JP S5473515 A JPS5473515 A JP S5473515A
Authority
JP
Japan
Prior art keywords
circuit
rotary head
output
actuated
electromagnetic brake
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
JP14004377A
Other languages
Japanese (ja)
Inventor
Makoto Yamane
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP14004377A priority Critical patent/JPS5473515A/en
Publication of JPS5473515A publication Critical patent/JPS5473515A/en
Pending legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE: To secure an easy increase of the revolution number of the rotary head by a desired amount by controlling the electromagnetic brake through adoption of the electromagnetic braking system to the disc servo.
CONSTITUTION: The rotary head is rotated in a higher speed (30 or 45Hz) than 30Hz via disc motor 18 and elastic belt 20. And FF2 is actuated by the pulse signal which is induced to the tachohead 1 through rotations of steel bar 15. With the output of FF2, trapezoid wave generator circuit 3 is actuated. Then the output of circuit 3 is compared 6 with reference signal 7, and comparison output 9 is applied to compound circuit 16. And electromagnetic brake 19 is controlled via amplifier circuit 17 to set the revolution of the rotary head to 30Hz, and at the same time the phase is synchronized with signal 7.
COPYRIGHT: (C)1979,JPO&Japio
JP14004377A 1977-11-24 1977-11-24 Magnetic recording/reproducing system Pending JPS5473515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14004377A JPS5473515A (en) 1977-11-24 1977-11-24 Magnetic recording/reproducing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14004377A JPS5473515A (en) 1977-11-24 1977-11-24 Magnetic recording/reproducing system

Publications (1)

Publication Number Publication Date
JPS5473515A true JPS5473515A (en) 1979-06-12

Family

ID=15259635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14004377A Pending JPS5473515A (en) 1977-11-24 1977-11-24 Magnetic recording/reproducing system

Country Status (1)

Country Link
JP (1) JPS5473515A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175288A (en) * 1983-03-25 1984-10-04 Hitachi Ltd Magnetic recording device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175288A (en) * 1983-03-25 1984-10-04 Hitachi Ltd Magnetic recording device

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