JPS5829111A - Data protecting circuit in magnetic recorder - Google Patents
Data protecting circuit in magnetic recorderInfo
- Publication number
- JPS5829111A JPS5829111A JP12678981A JP12678981A JPS5829111A JP S5829111 A JPS5829111 A JP S5829111A JP 12678981 A JP12678981 A JP 12678981A JP 12678981 A JP12678981 A JP 12678981A JP S5829111 A JPS5829111 A JP S5829111A
- Authority
- JP
- Japan
- Prior art keywords
- head
- driver
- voltage
- circuit
- until
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
Abstract
Description
【発明の詳細な説明】
本発明は磁気記録装置におけるデータ保護回路に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data protection circuit in a magnetic recording device.
磁気記録装置においては媒体にデータを書き込むヘッド
とそのヘッドに電流を流す回路が必要である。また、ヘ
ッドと記録媒体とは常に接近した状態にある為、不用意
な電源の０Ｎ１０ＦＦがあるとヘッドに影響を及はし記
録データを破壊することがある為、電源投入にシーケン
スを持たせるとか、書込み回路に何かの保護回路を設け
ることが必要である。A magnetic recording device requires a head for writing data on a medium and a circuit for supplying current to the head. Also, since the head and recording medium are always in close proximity, an inadvertent 0N10FF of power supply may affect the head and destroy the recorded data, so it is recommended to have a sequence when turning on the power. , it is necessary to provide some kind of protection circuit in the write circuit.
従来の保護回路を有する磁気記録回路ではイレーズヘッ
ド及びリードライト （Ｒ／Ｗ ）ヘッドのそれぞれの
駆動回路内にそれぞれ保護回路が設置られていたため構
成部品点数が非常に多くなりコストが高く麦っていた。In conventional magnetic recording circuits with protection circuits, protection circuits were installed in the drive circuits of each of the erase head and read/write (R/W) head, resulting in an extremely large number of component parts and high costs. Ta.
また保論回路がヘッドコイルに電流を流し込む側に一人
されていたため保籟が完全に行なわれない等の欠点があ
った。In addition, since one person was in charge of the circuit for supplying current to the head coil, there were drawbacks such as incomplete protection.
本発明は以上に鑑みてなされたもので、コスト高を招く
ことなく完全にデータを保護することの可能なデータ保
護回路を提供することを目的とするものである。The present invention has been made in view of the above, and it is an object of the present invention to provide a data protection circuit that can completely protect data without increasing costs.
以下に実施例（二より本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail from Examples (Second to 2).
図面は本発明の一実施例を示したものであシ、（ＩＩ）
はイレーズヘッド、０３はリードライトヘッド、０３は
イレーズヘッドのドライバー、α尋は゛リードライ 、
トヘッドのドライバー、ａ！１９はスイッチングＩＣ回
路。The drawings show one embodiment of the present invention, (II)
is the erase head, 03 is the read/write head, 03 is the erase head driver, αhiro is the read dry,
head driver, a! 19 is a switching IC circuit.
輪は定電流源回路、ａηは両ヘッド共用の帰線回路のド
ライバー、ａｓはその他のロジックＩＣが正常に動作す
る電圧になるまでドライバー収ηをＯＮさせない様ヒし
ているバイアス回路である。このバイアス回路ａ時の含
んでいるツェナーダイオードはツェナー電圧Ｖｓを磁気
記録装置上のＩＣが誤動作を生じない所定の値に設定さ
れる。ドライバーａηはそのベース入力電圧がツェナー
電圧Ｖｚより高くないとＯＮ ＬないＯで電源が完全に
立上るまではＯＦＦ状態を保ち両ヘッドスイルに流れる
電流を完全に遮断する。The ring is a constant current source circuit, a.eta. is a driver for the retrace circuit shared by both heads, and as is a bias circuit that prevents the driver collection .eta. from being turned on until the voltage at which other logic ICs can operate normally is reached. The Zener diode included in the bias circuit a sets the Zener voltage Vs to a predetermined value that will not cause the IC on the magnetic recording device to malfunction. Unless the base input voltage is higher than the Zener voltage Vz, the driver aη remains in the OFF state until the power supply is completely turned on, completely cutting off the current flowing to both head coils.
本発明は以上のようになるものであり、Ｉ）電源ジ−タ
ンスが不用であり、ＩＩ）ヘッドコイルに直接、保護回
路かは入っているので保護が完全てあり、Ｉ）リードラ
イト、イレーズ両ヘッドに対して保護回路が１つですみ
、ＩＶ）構成部品点数がすくなくてｔ＋コストが安くな
る利点が得られる。The present invention is as described above, and has the following features: I) power supply resistance is not required; II) protection circuit is installed directly in the head coil, so protection is complete; and I) read/write/erase. Only one protection circuit is required for both heads, and IV) the advantage is that the number of component parts is small and the t+ cost is low.
図面は本発明一実施例を備えた磁気記録装置１回路図で
ある。
１１；イレーズヘッド、１２： リードライトヘッド、
１３：イレーズヘッドドライバ、
１４：リードライトヘッドドライバ、
１７：帰線ドライバ、 １８：バイアス回路。
代理人 弁理士 井 上 −男The drawing is a circuit diagram of a magnetic recording device equipped with an embodiment of the present invention. 11: erase head, 12: read/write head,
13: Erase head driver, 14: Read/write head driver, 17: Return driver, 18: Bias circuit. Agent Patent Attorney Inoue - Male
Claims (1)
ズヘッドと、前記リードライトヘッドのヘッドコイル〇
一端に接続された第１のヘッド駆動ＷＡｗ＆と、前記イ
レーズヘッドのヘッドコイルの一端に接続された第２の
ヘッド駆動（ロ）路と、前記リードライトヘッドのヘッ
ドコイルの他端と前記イレーズヘッドのヘッドコイルの
他端とが共通に接続されたスイッチ素子と、このスイッ
チ素子を電源がＯＮされたのち所定の電圧に立上るまで
開放状態に保つスイッチ制御手段とを具備することを特
徴とする磁気記録装置に於けるデータ保護回路。The magnetic recording device includes a read/write head, an erase head, a first head drive WAw& connected to one end of the head coil of the read/write head, and a second head drive WAw& connected to one end of the head coil of the erase head. a head drive (b) path, a switch element to which the other end of the head coil of the read/write head and the other end of the head coil of the erase head are commonly connected; 1. A data protection circuit in a magnetic recording device, comprising switch control means that maintains an open state until a predetermined voltage rises.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678981A JPS5829111A (en) | 1981-08-14 | 1981-08-14 | Data protecting circuit in magnetic recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678981A JPS5829111A (en) | 1981-08-14 | 1981-08-14 | Data protecting circuit in magnetic recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5829111A true JPS5829111A (en) | 1983-02-21 |
Family
ID=14943973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12678981A Pending JPS5829111A (en) | 1981-08-14 | 1981-08-14 | Data protecting circuit in magnetic recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5829111A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61114794A (en) * | 1984-11-08 | 1986-06-02 | インターナシヨナル テクノロジー コーポレーシヨン | Removal of contaminant of permeable ground layer |
| GB2236749A (en) * | 1988-06-23 | 1991-04-17 | Antonio Maria Celi | Removing metals from sludge or soll |
-
1981
- 1981-08-14 JP JP12678981A patent/JPS5829111A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61114794A (en) * | 1984-11-08 | 1986-06-02 | インターナシヨナル テクノロジー コーポレーシヨン | Removal of contaminant of permeable ground layer |
| JPH0452151B2 (en) * | 1984-11-08 | 1992-08-21 | Intaanashonaru Tekunorojii Corp | |
| GB2236749A (en) * | 1988-06-23 | 1991-04-17 | Antonio Maria Celi | Removing metals from sludge or soll |
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