JPS5665308A - Alternating-current bias supply system for magnetic recording - Google Patents
Alternating-current bias supply system for magnetic recordingInfo
- Publication number
- JPS5665308A JPS5665308A JP14086479A JP14086479A JPS5665308A JP S5665308 A JPS5665308 A JP S5665308A JP 14086479 A JP14086479 A JP 14086479A JP 14086479 A JP14086479 A JP 14086479A JP S5665308 A JPS5665308 A JP S5665308A
- Authority
- JP
- Japan
- Prior art keywords
- bias currents
- erasure
- transistor
- high frequency
- rectangular wave
- 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
Links
Abstract
PURPOSE: To eliminate irregularity in erasure and impossibility of erasure by holding an erasing current constant by controlling recording bias currents at the best values respectively by a microcomputer.
CONSTITUTION: The output of high frequency oscillator 14 applying a high frequency bias to erasing head 16 is converted by the 1st transistor 7 into a rectangular wave signal. To obtain this rectangular wave signal, a DV voltage is generated, while a binary signal is obtained from a control signal generated through microcomputer 2, etc., corresponding to bias currents of magnetic heads 31 and 32 and then applied to the 2nd transistor 13 to control a DC voltage applied to the 1st transistor 7 and after the rectangular wave is converted into a high frequency sine wave signal, bias currents are applied to recording magnetic heads 31 and 32. The constitution like this can control bias currents of recording magnetic head automatically and also hold an erasing current constant, so that irregularity and impossibility of erasure can be eliminated.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14086479A JPS5665308A (en) | 1979-10-31 | 1979-10-31 | Alternating-current bias supply system for magnetic recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14086479A JPS5665308A (en) | 1979-10-31 | 1979-10-31 | Alternating-current bias supply system for magnetic recording |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5665308A true JPS5665308A (en) | 1981-06-03 |
JPS6117043B2 JPS6117043B2 (en) | 1986-05-06 |
Family
ID=15278511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14086479A Granted JPS5665308A (en) | 1979-10-31 | 1979-10-31 | Alternating-current bias supply system for magnetic recording |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5665308A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5719520U (en) * | 1980-07-04 | 1982-02-01 | ||
JPS60223008A (en) * | 1984-04-18 | 1985-11-07 | Nec Corp | Bias controller |
-
1979
- 1979-10-31 JP JP14086479A patent/JPS5665308A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5719520U (en) * | 1980-07-04 | 1982-02-01 | ||
JPS60223008A (en) * | 1984-04-18 | 1985-11-07 | Nec Corp | Bias controller |
JPH041922B2 (en) * | 1984-04-18 | 1992-01-14 | Nippon Electric Co |
Also Published As
Publication number | Publication date |
---|---|
JPS6117043B2 (en) | 1986-05-06 |
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