JPH0115953B2 - - Google Patents
Info
- Publication number
- JPH0115953B2 JPH0115953B2 JP54040091A JP4009179A JPH0115953B2 JP H0115953 B2 JPH0115953 B2 JP H0115953B2 JP 54040091 A JP54040091 A JP 54040091A JP 4009179 A JP4009179 A JP 4009179A JP H0115953 B2 JPH0115953 B2 JP H0115953B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- capacitor
- power supply
- motor
- resistor
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
この発明は、電子計算機等に用いられる磁気デ
イスク装置の緊急退避用電源に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency evacuation power supply for a magnetic disk device used in an electronic computer or the like.
一般に、浮上型磁気ヘツドを、例えばリニアモ
ータなどの可動コイル型モータを用いて移動する
方式の磁気デイスク装置では、停電等の異常事態
発生時に、ヘツドの墜落を防ぐためにすみやかに
ヘツドを退避させなければならない。 In general, in a magnetic disk device that moves a floating magnetic head using a moving coil motor such as a linear motor, the head must be evacuated quickly to prevent the head from falling in the event of an abnormal situation such as a power outage. Must be.
まず、磁気デイスク装置について、簡単に説明
する。 First, the magnetic disk device will be briefly explained.
第１図において、１は磁気デイスクで、円周に
沿つた一定間隔の各トラツクに情報を記憶するも
のである。２はスピンドル、３はスピンドルプー
リ、４は上記スピンドルプーリ３とモータプーリ
５とに張架されたベルト、６はモータプーリ５に
回転力を与えて上記磁気デイスク１を回転させる
スピンドルモータである。７は磁気ヘツドで、上
記磁気デイスク１の面上に浮上していて、記録再
生を行うものである。８はキヤリツジで、上記磁
気ヘツド７を支持し、ベアリング９を介して、レ
ール１０に案内されて移動位置決めを行なうもの
である。１１は可動コイル型モータである直線形
電動機（リニアモータ）で、マグネツト１２、鉄
材１３、及び上記キヤリツジ８の後部に設けられ
たコイル１４によつて構成され、コイル１４に電
流を流して、キヤリツジ８に磁気デイスク１の半
径方向の駆動力を与える。１５はリニアモータを
駆動する制御回路、１６は緊急退避用電源、１７
は異常時切換用リレーK1（以下、リレーと言う）
である。磁気ヘツド７は磁気デイスク１の回転に
よりその面上を浮上しており、停電などの異常時
には、すみやかに、磁気ヘツド７を磁気デイスク
１の面上から退避させる必要がある。 In FIG. 1, reference numeral 1 denotes a magnetic disk, which stores information in each track at regular intervals along the circumference. 2 is a spindle, 3 is a spindle pulley, 4 is a belt stretched between the spindle pulley 3 and the motor pulley 5, and 6 is a spindle motor that applies rotational force to the motor pulley 5 to rotate the magnetic disk 1. A magnetic head 7 floats above the surface of the magnetic disk 1 and performs recording and reproduction. A carriage 8 supports the magnetic head 7 and is guided by a rail 10 via a bearing 9 for movement and positioning. Reference numeral 11 denotes a linear motor (linear motor) which is a moving coil type motor, and is composed of a magnet 12, an iron material 13, and a coil 14 provided at the rear of the carriage 8. 8 is applied to drive the magnetic disk 1 in the radial direction. 15 is a control circuit that drives the linear motor; 16 is an emergency evacuation power source; 17
is abnormal switching relay K 1 (hereinafter referred to as relay)
It is. The magnetic head 7 floats above the surface of the magnetic disk 1 as the magnetic disk 1 rotates, and in the event of an abnormality such as a power outage, it is necessary to quickly evacuate the magnetic head 7 from the surface of the magnetic disk 1.
従来より、このヘツドを退避させるための電源
として、あらかじめ必要な電圧を抵抗の分圧によ
りキヤパシタにたくわえておき、このエネルギー
を利用するものと、大容量のキヤパシタをもつた
低インピーダンスの電源から直接抵抗によつて電
流を制限し、利用するものがあつた。 Conventionally, as a power source for evacuating this head, the necessary voltage is stored in a capacitor in advance by dividing the voltage through resistors, and this energy is used.In some cases, a low impedance power source with a large capacity capacitor is used. There was one that used a resistor to limit the current.
しかし、この従来のものでは、前者には、一度
緊急退避してしまうと、復帰するのに時間がかか
ること、そして常に一定の電流を流さなくてはな
らないという欠点があつた。また後者では、例え
ばモータがリニアモータの場合にはリニアモータ
の直流抵抗が約２Ωと小さいため、電流制限抵抗
での損失が大きくなり、回路故障の際には、抵抗
の焼損を起こすおそれがあつた。 However, the former has the drawbacks that once an emergency evacuation occurs, it takes time to return, and that a constant current must always be applied. In addition, in the case of the latter, for example, if the motor is a linear motor, the direct current resistance of the linear motor is as small as about 2Ω, so the loss in the current limiting resistor is large, and there is a risk of burning out the resistor in the event of a circuit failure. Ta.
この発明は、前記した従来の欠点を解決するた
めになされたもので、電流制限型定電圧電源を用
いた磁気デイスク装置を提供するものである。 The present invention was made to solve the above-mentioned conventional drawbacks, and provides a magnetic disk device using a current-limited constant voltage power supply.
以下、図面に従つてこの発明の特徴とする、電
流制限型定電圧緊急退避電源を一実施例にもとづ
いて説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A current-limited constant-voltage emergency evacuation power supply, which is a feature of the present invention, will be described below based on one embodiment with reference to the drawings.
第２図は緊急退避回路のブロツク図の一例で、
１８は磁気デイスク電源で、１４，１５，１６，
１７は、第１図と同じである。異常事態発生時に
はリレー１７が切換わり、コイル１４に緊急電源
１６よりマイナスの電圧を供給し、キヤリツジ８
を後方に引き、磁気ヘツド７を磁気デイスク１上
から退避させる。 Figure 2 is an example of a block diagram of an emergency evacuation circuit.
18 is a magnetic disk power supply, 14, 15, 16,
17 is the same as in FIG. When an abnormal situation occurs, the relay 17 switches, and the emergency power supply 16 supplies negative voltage to the coil 14, and the carriage 8
is pulled backward to retract the magnetic head 7 from above the magnetic disk 1.
第３図から第５図は、第２図の緊急退避用電源
１６の詳細図で、いずれもその入力端子１６１が
上記電源１８に接続され同出力端子１６２がリレ
ー１７に接続される。 3 to 5 are detailed views of the emergency evacuation power supply 16 shown in FIG.
第３図は従来の抵抗分圧式の緊急退避用電源の
回路図の一例で、抵抗R1，R2によりキヤパシタ
C1に充電する電圧が決まる。この回路では、キ
ヤパシタC1に充電後も、抵抗R1，R2に電流が流
れ、無駄なエネルギーを消費することになる。ま
た、抵抗R1，R2を大きくすると、キヤパシタC1
の復帰に時間がかかつてしまう。 Figure 3 is an example of a circuit diagram of a conventional resistor-divided type emergency evacuation power supply.
The voltage to charge C1 is determined. In this circuit, even after charging the capacitor C1 , current flows through the resistors R1 and R2 , resulting in wasted energy consumption. Also, if the resistances R 1 and R 2 are increased, the capacitor C 1
It will take time to recover.
第４図は従来の抵抗電流制限式の緊急退避用電
源の回路図の一例で、キヤパシタC2に充電され
たエネルギーを抵抗R3で電流を制限し供給する。
この回路では、抵抗R3を大きくするとエネルギ
ーがとれず、小さくすると電流が過大となり、抵
抗R3での損失が大となる。 FIG. 4 is an example of a circuit diagram of a conventional resistance current limiting type emergency evacuation power supply, in which the energy charged in the capacitor C 2 is supplied with the current limited by the resistor R 3 .
In this circuit, if the resistor R 3 is made large, energy cannot be taken, and if it is made small, the current becomes excessive and the loss in the resistor R 3 becomes large.
第５図は、この発明による緊急電源の回路図の
一例で、入力端子１６１と出力端子１６２との間
にトランジスタTR1と抵抗R5を直列に挿入し、
出力端子１６２とアースとの間にキヤパシタC3
を接続している。また、トランジスタTR1のベー
スには定電圧ダイオードD1が挿入され、TR1の
コレクタ・ベース間には、抵抗R4が接続されて
いる。 FIG. 5 is an example of a circuit diagram of an emergency power supply according to the present invention, in which a transistor TR 1 and a resistor R 5 are inserted in series between an input terminal 161 and an output terminal 162.
Connect capacitor C 3 between output terminal 162 and ground.
are connected. Further, a constant voltage diode D1 is inserted into the base of the transistor TR1 , and a resistor R4 is connected between the collector and base of TR1 .
上記構成において、通常時は、リレー１７はコ
イル１４を制御回路１５側に接続している。 In the above configuration, the relay 17 normally connects the coil 14 to the control circuit 15 side.
この状態においては、トランジスタTR1のベー
ス電圧は定電圧ダイオードD1で定まり、従つて
TR1の出力側には所定電圧の出力が生じ、この出
力が抵抗R5を介してキヤパシタC3に充電され、
所定のエネルギーが蓄えられると、電流は流れな
くなる。 In this state, the base voltage of transistor TR 1 is determined by voltage regulator diode D 1 and therefore
An output of a predetermined voltage is generated on the output side of TR 1 , and this output is charged to the capacitor C 3 via the resistor R 5 .
Once a predetermined amount of energy has been stored, no current will flow.
異常事態発生時には、リレー１７が切り替わり
コイル１４を緊急退避用電源１６の出力端子１６
２側に接続する。 When an abnormal situation occurs, the relay 17 switches to connect the coil 14 to the output terminal 16 of the emergency evacuation power source 16.
Connect to the 2nd side.
そこで、まずキヤパシタC3に蓄えられていた
エネルギーがコイル１４に供給され、このエネル
ギーで退避動作を開始する。 Therefore, first, the energy stored in the capacitor C3 is supplied to the coil 14, and the evacuation operation is started using this energy.
キヤパシタC3の容量は、ヘツド退避完了に間
に合うよう設定されており、異常事態が停電であ
る場合には、ヘツド退避完了後、キヤパシタC3
の蓄積エネルギー放出終了により、動作が完了す
る。異常事態が停電以外による場合は、キヤパシ
タC3のエネルギーを放出した後は、−45V入力端
子に接続された電源１８から、トランジスタ
TR1、抵抗R5を経て電流が流れるが、この場合、
上記一定電圧に対する、抵抗R5とコイル１４の
内部抵抗RLの和の抵抗値で定まる値に制限され
た一定電流となる。 The capacity of capacitor C 3 is set to be sufficient for the completion of head evacuation, and if the abnormal situation is a power outage, the capacity of capacitor C 3 is set in time for completion of head evacuation.
The operation is completed when the stored energy is released. If the abnormality is due to something other than a power outage, after discharging the energy of capacitor C3 , the transistor
Current flows through TR 1 and resistor R 5 , but in this case,
The constant current is limited to a value determined by the resistance value of the sum of the resistance R 5 and the internal resistance RL of the coil 14 with respect to the above constant voltage.
従つて、停電以外の緊急時の動作は安定であ
り、制限抵抗R5には過大電圧はかからず焼損が
防げる。さらにトランジスタ、抵抗とコイルに流
れる電流は単一電源１８から供給されるので緊急
時動作は確実である。この回路はキヤパシタC3
に充電されると無駄な電力消費はなく、また、第
４図に示す回路とくらべ、キヤパシタの放電時に
無駄になる電力消費が少ない。 Therefore, the operation is stable in an emergency other than a power outage, and no excessive voltage is applied to the limiting resistor R5 , thereby preventing burnout. Furthermore, since the current flowing through the transistor, resistor and coil is supplied from a single power supply 18, emergency operation is reliable. This circuit uses capacitor C 3
There is no wasted power consumption when the capacitor is charged, and compared to the circuit shown in FIG. 4, less power is wasted when the capacitor is discharged.
なお、実施例では可動コイル型モータの例とし
てリニアモータの場合について説明したが、例え
ばボイスコイル型モータであつてもよいことは勿
論である。 In the embodiment, a linear motor has been described as an example of a moving coil type motor, but it goes without saying that a voice coil type motor may also be used, for example.
以上説明したようにこの発明は、はじめキヤパ
シタのエネルギーにより大きなエネルギーを出力
し、その後負荷が軽減されなければ安全な電流で
安定し、負荷がなくなればキヤパシタの充電が早
いという利点がある。また、磁気デイスクにおい
ては特別に電源を増やすことなく、また無駄な電
力消費をすることなく緊急用電源を実現できる効
果を有する。 As explained above, the present invention has the advantage that a large amount of energy is initially output by the energy of the capacitor, and then the current stabilizes at a safe level unless the load is reduced, and the capacitor is quickly charged once the load is removed. Furthermore, the magnetic disk has the effect of being able to provide an emergency power source without increasing the number of power sources or consuming unnecessary power.
第１図は磁気デイスクの機構図、第２図は緊急
退避回路のブロツク図、第３図および第４図は従
来の緊急退避用電源の回路図、第５図はこの発明
の一実施例を示す緊急退避用電源の回路図であ
り、図中、TR1はトランジスタ、D1はダイオー
ド、C3はキヤパシタ、R4，R5は抵抗である。
Fig. 1 is a mechanical diagram of a magnetic disk, Fig. 2 is a block diagram of an emergency evacuation circuit, Figs. 3 and 4 are circuit diagrams of a conventional emergency evacuation power supply, and Fig. 5 is an embodiment of the present invention. This is a circuit diagram of the emergency evacuation power supply shown in FIG .
Claims (1)
ツドを移動するものであつて、このモータ並びに
装置全体へ電気エネルギーを供給する電源と、こ
の電源に入力端子が接続され出力端子が緊急時に
異常時切換用リレーを介して上記モータのコイル
に接続される緊急退避用電源とを備えた磁気デイ
スク装置において、上記緊急退避用電源として、
その入力端子と出力端子との間に、定電圧ダイオ
ードで電圧規制されるトランジスタと抵抗とを直
列に接続し、上記出力端子とアースとの間にキヤ
パシタを接続したことを特徴とする磁気デイスク
装置。1 The magnetic head is moved by exciting the coil of the motor, and it has a power supply that supplies electrical energy to the motor and the entire device, and an input terminal connected to this power supply and an output terminal for switching in case of an emergency. In a magnetic disk device comprising an emergency evacuation power source connected to the coil of the motor via a relay, as the emergency evacuation power source,
A magnetic disk device characterized in that a transistor whose voltage is regulated by a voltage regulator diode and a resistor are connected in series between the input terminal and the output terminal, and a capacitor is connected between the output terminal and ground. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4009179A JPS55132513A (en) | 1979-04-03 | 1979-04-03 | Magnetic disc unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4009179A JPS55132513A (en) | 1979-04-03 | 1979-04-03 | Magnetic disc unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55132513A JPS55132513A (en) | 1980-10-15 |
| JPH0115953B2 true JPH0115953B2 (en) | 1989-03-22 |
Family
ID=12571209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4009179A Granted JPS55132513A (en) | 1979-04-03 | 1979-04-03 | Magnetic disc unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55132513A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4032619A1 (en) | 2021-01-25 | 2022-07-27 | Korea Institute of Science and Technology | Mesh type atomizer using porous thin film and method for manufacturing the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56106576U (en) * | 1980-01-16 | 1981-08-19 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335509A (en) * | 1976-09-13 | 1978-04-03 | Mitsubishi Electric Corp | Magnetic disk driver |
-
1979
- 1979-04-03 JP JP4009179A patent/JPS55132513A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335509A (en) * | 1976-09-13 | 1978-04-03 | Mitsubishi Electric Corp | Magnetic disk driver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4032619A1 (en) | 2021-01-25 | 2022-07-27 | Korea Institute of Science and Technology | Mesh type atomizer using porous thin film and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55132513A (en) | 1980-10-15 |
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