JPS5570906A - Magnetic recording and reproducing unit - Google Patents

Magnetic recording and reproducing unit

Info

Publication number
JPS5570906A
JPS5570906A JP14238678A JP14238678A JPS5570906A JP S5570906 A JPS5570906 A JP S5570906A JP 14238678 A JP14238678 A JP 14238678A JP 14238678 A JP14238678 A JP 14238678A JP S5570906 A JPS5570906 A JP S5570906A
Authority
JP
Japan
Prior art keywords
erase
recording
head
current
remained
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
JP14238678A
Other languages
Japanese (ja)
Inventor
Atsushi Yoshioka
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 Ltd
Original Assignee
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14238678A priority Critical patent/JPS5570906A/en
Publication of JPS5570906A publication Critical patent/JPS5570906A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Landscapes

  • Magnetic Heads (AREA)

Abstract

PURPOSE:To prevent the production of high harmonic distortion specific to DC erase for the reproducing signal, by superimposing the DC current demagnetizing the magnetism remained on the recording media with DC erase on the recoding current to feed the result to the reocording head. CONSTITUTION:The magnetic recording and reproducing unit consists of the DC electromagnet type erase head 2 and the recording head 6, and the recording head 6 is made up of the head core 7 of ring shape a part of which is lost, heat winding 8 wound on the core 7, recording power supply 9 and DC power supply 10 superimposing DC current on the recording current. In performing DC erase with the erase head 2, unidirectional magnetization is remained on the recording media 1. When a signal is recorded on the recording media 1 with the recording head 6, since the DC current demagnetizing the unidirectional magnetism remained regardless of DC erase is superimposed on the recording current, no effect of DC erase is appeared on the magnetization on the recording media 1. Accordingly, harmonic distortion specific to DC erase is avoided for the reproducing signal.
JP14238678A 1978-11-20 1978-11-20 Magnetic recording and reproducing unit Pending JPS5570906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14238678A JPS5570906A (en) 1978-11-20 1978-11-20 Magnetic recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14238678A JPS5570906A (en) 1978-11-20 1978-11-20 Magnetic recording and reproducing unit

Publications (1)

Publication Number Publication Date
JPS5570906A true JPS5570906A (en) 1980-05-28

Family

ID=15314149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14238678A Pending JPS5570906A (en) 1978-11-20 1978-11-20 Magnetic recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS5570906A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5783315A (en) * 1980-11-14 1982-05-25 Sumitomo Metal Ind Ltd Gang slitter
JPH01241002A (en) * 1988-03-22 1989-09-26 Mitsubishi Electric Corp Magnetic recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5783315A (en) * 1980-11-14 1982-05-25 Sumitomo Metal Ind Ltd Gang slitter
JPS6121768B2 (en) * 1980-11-14 1986-05-28 Sumitomo Metal Ind
JPH01241002A (en) * 1988-03-22 1989-09-26 Mitsubishi Electric Corp Magnetic recording and reproducing device

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