JPS6255228B2 - - Google Patents
Info
- Publication number
- JPS6255228B2 JPS6255228B2 JP24444584A JP24444584A JPS6255228B2 JP S6255228 B2 JPS6255228 B2 JP S6255228B2 JP 24444584 A JP24444584 A JP 24444584A JP 24444584 A JP24444584 A JP 24444584A JP S6255228 B2 JPS6255228 B2 JP S6255228B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- positioning
- present
- track
- information
- 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
- 238000000034 method Methods 0.000 claims description 6
- 238000004904 shortening Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000010365 information processing Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 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
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/14—Control of operating function, e.g. switching from recording to reproducing by sensing movement or position of head, e.g. means moving in correspondence with head movements
Description
【発明の詳細な説明】
〔発明の背景〕
本発明は、磁気デイスク装置におけるデータト
ラツクサーボを用いた磁気ヘツド位置決め方法の
改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Background of the Invention] The present invention relates to an improvement in a magnetic head positioning method using data track servo in a magnetic disk device.
第１図は、従来の精度の良い位置決め装置とし
ての例を示す。デイスク４は、ハブ５に組立てら
れて回転する。このデイスク４上の情報を記録す
るトラツク６をセクタに分割し、各セクタの先頭
に位置基準信号２を書き込み、その信号でヘツド
１とトラツク６の位置ずれ量を検出し、それが０
となるように駆動装置３で修正した後情報の記
録・再生を行なう。など何らかの方法で情報の信
号と位置の信号を同じトラツク上で読み出すよう
にしたいわゆるデータトラツクサーボによる位置
決め装置がある。 FIG. 1 shows an example of a conventional positioning device with high precision. The disk 4 is assembled to the hub 5 and rotates. The track 6 on which information on the disk 4 is recorded is divided into sectors, a position reference signal 2 is written at the beginning of each sector, and the amount of positional deviation between the head 1 and the track 6 is detected using this signal.
After correction is made by the drive device 3 so that the information becomes , the information is recorded and reproduced. There is a positioning device using a so-called data track servo, which uses some method to read out an information signal and a position signal on the same track.
しかし、この方法の欠点の１つは、複数毎のデ
イスクに対しそれぞれヘツドが備えられている装
置において、ヘツドを切換えせ記録再生を行なう
とき、切換えられたヘツドで位置ずれを検出し修
正するための時間が必要であり、さらにタイミン
グが悪いとヘツドの切り換えのためにデイスク１
回転分持たなければならないことなどが起り情報
の処理能力が低下することがある。 However, one of the drawbacks of this method is that when recording/reproducing by switching heads in a device equipped with a head for each of a plurality of disks, positional deviations are detected and corrected using the switched head. time is required, and if the timing is bad, disk 1 will be lost due to head switching.
The information processing capacity may be reduced due to the need for rotation.
本発明は、かかる点に着目してなされたもので
あり、位置決め精度の良いデータトラツクサーボ
を採用し、情報の処理能力をほとんど低下させな
いようにした磁気ヘツド位置決め装置を提供する
ものである。
The present invention has been made in view of this point, and it is an object of the present invention to provide a magnetic head positioning device that employs a data track servo with high positioning accuracy and that hardly reduces the information processing ability.
上記目的を達成するために、本発明の位置決め
装置では、着目するトラツクとヘツドの位置ずれ
量を検出し、その値が設定した値より大か小かを
判定する回路を備え、小であれば直ちに記録又は
再生を行なうようにし、大であれば位置の修正を
行なつた後記録又は再生を行うようにしてヘツド
切換時間の短縮を計るように構成したものであ
る。
In order to achieve the above object, the positioning device of the present invention includes a circuit that detects the amount of positional deviation between the target track and the head, and determines whether the value is larger or smaller than a set value. The head switching time is shortened by immediately recording or reproducing, and if the recording or reproducing is performed after the position is corrected.
以下、本発明を実施例を参照して説明する。 Hereinafter, the present invention will be explained with reference to Examples.
第２図は、本発明の一実施例を示す図である。
デイスク４は、ハブ５に組立てられて回転してい
る。ヘツド１１，１２，１３（説明の便宜上、ヘ
ツドを３個として説明する。その他は、図示省
略。）はキヤリジ７に取りつけられ、後方から駆
動装置（図示省略）によつて駆動され、トラツク
の中心Ａを目標に位置決めされる。装置組立後、
位置基準トラツクを書き込む際には、充分温度管
理された雰囲気でキヤリジ７を一定ピツチで送
り、該当するヘツドで書き込む。そして一定ピツ
チで送るには、例えばレーザ測長器が用いられ
る。 FIG. 2 is a diagram showing an embodiment of the present invention.
The disk 4 is assembled to the hub 5 and rotates. Heads 11, 12, and 13 (for convenience of explanation, three heads will be described. The others are not shown) are attached to the carriage 7, driven from the rear by a drive device (not shown), and are driven from the center of the track. Positioning is done with A as the target. After assembling the device,
When writing a position reference track, the carriage 7 is fed at a constant pitch in an atmosphere with sufficient temperature control, and writing is performed using the corresponding head. For example, a laser length measuring device is used to send the data at a constant pitch.
今、ヘツド１１はトラツクの中心Ａで位置信号
に追従して情報の書込み、または読出しを行なつ
ている。一方、この装置では情報の再生が正しく
行なわれるために必要な位置決め精度はＡを中心
として±Ｌである。 At present, the head 11 is writing or reading information at the center A of the track, following the position signal. On the other hand, in this device, the positioning accuracy necessary for correctly reproducing information is ±L with A as the center.
実使用時ヘツド１２，１３は装置の温度上昇の
際の熱膨張差による変位などでＡから若干ずれて
いる。本実施例ではヘツド１１からヘツド１２に
切り替えて情報の記録・再生を行なう際、位置検
出回路８も切り換える。このとき本発明の位置決
め装置においては、第３図に示すように許容位置
決め誤差±Ｌを設定する回路３０、着目するトラ
ツクとヘツドの位置ずれ量（上記位置検出回路を
介して）を検出する位置ずれ（±Ｘ）検出手段３
１、およびＬとＸを比較する比較器３２を備え、
｜Ｘ｜≦｜Ｌ｜であれば記録・再生回路３３が作
働し、｜Ｘ｜＞｜Ｌ｜であれば位置修正手段３４
により｜Ｘ｜≦｜Ｌ｜になるまで位置の修正を行
なう。 During actual use, the heads 12 and 13 are slightly deviated from A due to displacement due to a difference in thermal expansion when the temperature of the device increases. In this embodiment, when switching from the head 11 to the head 12 to record/reproduce information, the position detection circuit 8 is also switched. At this time, in the positioning device of the present invention, as shown in FIG. Displacement (±X) detection means 3
1, and a comparator 32 for comparing L and X,
If |X|≦|L|, the recording/reproducing circuit 33 operates, and if |X|>|L|, the position correction means 34 operates.
The position is corrected until |X|≦|L|.
再び第２図に戻れば、ヘツド１３は位置ずれ量
が許容範囲±Ｌより大であるので位置の修正が必
要であるが、ヘツド１２の位置ずれは±Ｌより小
であるので位置の修正は不要であり直ちに記録・
再生を開始できる。本実施例の装置では許容され
る位置決め誤差は例えば±２μｍで、発生する位
置決め誤差の最大値は例えば±５μｍである。発
生する位置決め誤差は種々の要因によるものの累
積であり、最大値はほとんど生じない。本実施例
においては位置決め誤差が±２μｍを越えるのは
約１時間に１回程度であり、この程度なら通常情
報の処理能力にほとんど影響を与えない。 Returning to FIG. 2 again, the position of the head 13 needs to be corrected because its positional deviation is larger than the allowable range ±L, but the position of the head 12 is smaller than ±L, so the position cannot be corrected. It is not necessary and should be recorded immediately.
You can start playing. In the apparatus of this embodiment, the allowable positioning error is, for example, ±2 μm, and the maximum value of the positioning error that occurs is, for example, ±5 μm. The positioning error that occurs is an accumulation of various factors, and the maximum value hardly occurs. In this embodiment, the positioning error exceeds ±2 .mu.m about once every hour, and this level of error usually has little effect on the information processing ability.
他の実施例としては、第４図の如く各ヘツド１
１，１２，１３に位置検出用回路８を備える方法
が有る。この方法によれば、ヘツド１１で情報の
記録・再生を行なつている時、同時にヘツドに、
ヘツド１３で第３図に示した回路により位置決め
誤差量の検出が可能である。そしてヘツド１２に
切換えたときには、位置基準信号２（第１図参
照）がヘツドの下に来るのを待たずに情報の記
録・再生をはじめることができる。 In another embodiment, each head 1 as shown in FIG.
There is a method in which position detection circuits 8 are provided at 1, 12, and 13. According to this method, when the head 11 is recording or reproducing information, the head 11 simultaneously
The amount of positioning error can be detected in the head 13 by the circuit shown in FIG. When switching to the head 12, recording/reproduction of information can be started without waiting for the position reference signal 2 (see FIG. 1) to come under the head.
以上説明したように、本発明によれば、従来の
データトラツクサーボによる位置決め装置におけ
る欠点であつた情報の処理能力の低下を起こすこ
となく精度の良い磁気ヘツド位置決めを可能なら
しめるものであり、実用に供してその効果は大き
い。なお、本発明は、上記実施例において用いた
個数、数値等に限定されるものでなく、適宜設定
可能であることはいうまでもない。
As explained above, according to the present invention, it is possible to perform highly accurate magnetic head positioning without deteriorating the information processing capacity, which was a drawback of conventional positioning devices using data track servo, and is suitable for practical use. The effect is great. It goes without saying that the present invention is not limited to the numbers, numerical values, etc. used in the above embodiments, and can be set as appropriate.
第１図は従来の磁気ヘツド位置決め装置の例を
示す図、第２図は本発明の一実施例を示す略図、
第３図は本発明における磁気ヘツド位置決めの具
体的回路を示すブロツク図、第４図は本発明の他
の実施例を示す図である。
図中、１，１１，１２，１３…ヘツド、２…位
置基準信号、３…駆動装置、４…デイスク、５…
ハブ、６…トラツク。
FIG. 1 is a diagram showing an example of a conventional magnetic head positioning device, and FIG. 2 is a schematic diagram showing an embodiment of the present invention.
FIG. 3 is a block diagram showing a specific circuit for positioning the magnetic head according to the present invention, and FIG. 4 is a diagram showing another embodiment of the present invention. In the figure, 1, 11, 12, 13...head, 2...position reference signal, 3...driver, 4...disk, 5...
Hub, 6...Truck.
Claims (1)
トラツクと磁気ヘツドの位置ずれを検出し、その
値が設定した値より大か小かを判定し、小であれ
ば直ちに記録・再生を行ない、大であれば位置の
修正を行なつた後記録・再生を行なうようにし、
上記ヘツドの切換時間を短縮したことを特徴とす
る磁気ヘツド位置決め方法。1 When switching heads, detect the positional misalignment between the track of interest on the magnetic disk and the magnetic head, determine whether the misalignment is larger or smaller than the set value, and if it is small, record or play immediately; If so, record/play back after correcting the position.
A magnetic head positioning method characterized by shortening the head switching time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24444584A JPS60136971A (en) | 1984-11-21 | 1984-11-21 | Magnetic head positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24444584A JPS60136971A (en) | 1984-11-21 | 1984-11-21 | Magnetic head positioning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60136971A JPS60136971A (en) | 1985-07-20 |
| JPS6255228B2 true JPS6255228B2 (en) | 1987-11-18 |
Family
ID=17118755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24444584A Granted JPS60136971A (en) | 1984-11-21 | 1984-11-21 | Magnetic head positioning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60136971A (en) |
-
1984
- 1984-11-21 JP JP24444584A patent/JPS60136971A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60136971A (en) | 1985-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5825578A (en) | Method and apparatus for compensating track position due to written-in runout error in a disc drive | |
| US5867353A (en) | Off-track PES calibration for a magneto-resistive element | |
| US6094318A (en) | Method and apparatus for controlling data write operation according to flying height of transducer head | |
| US5187620A (en) | Head position determination control apparatus of data recording/reproducing apparatus in a data surface servo system | |
| US5754354A (en) | Magnetic disk drive unit with complex magnetic head of variable reading width | |
| JPS62277669A (en) | Head position control system for disk memory device | |
| US6049442A (en) | Multiply-written servo burst patterns for minimizing position error in servo disk drives | |
| JPH0945025A (en) | Disc apparatus and method for measuring shift amount of heads | |
| JPS6255228B2 (en) | ||
| JP2835763B2 (en) | Magnetic disk drive | |
| JP2506648B2 (en) | Magnetic head positioning device | |
| US5315458A (en) | Method and apparatus for positioning head on reference track of disk medium | |
| JPH03280275A (en) | Magnetic recording and reproducing device | |
| JPS62137780A (en) | Magnetic disk device | |
| JP2000040318A (en) | Disk storage device and head positioning control method for the same | |
| JPH04129071A (en) | Disk device | |
| JPH10334428A (en) | Interhead deviation measuring method and device for recording and reproducing separation type magnetic head | |
| JP2914971B2 (en) | Magnetic disk drive | |
| JPH09115124A (en) | Magnetic disk device | |
| JPH01176374A (en) | Magnetic head positioning controller | |
| JPH04328368A (en) | Correction system for data face servo signal detecting sensitivity of magnetic disk device | |
| JPH02123576A (en) | Flexible disk device | |
| JPH0836725A (en) | Magnetic disc apparatus | |
| JPH07118072B2 (en) | Magnetic disk device | |
| JPH01184677A (en) | Servo track writing device for magnetic disk |