JPS5473515A - Magnetic recording/reproducing system - Google Patents
Magnetic recording/reproducing systemInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59175288A (en) * | 1983-03-25 | 1984-10-04 | Hitachi Ltd | Magnetic recording device |
-
1977
- 1977-11-24 JP JP14004377A patent/JPS5473515A/en active Pending
Cited By (1)
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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