JPS6143780B2 - - Google Patents
Info
- Publication number
- JPS6143780B2 JPS6143780B2 JP55064360A JP6436080A JPS6143780B2 JP S6143780 B2 JPS6143780 B2 JP S6143780B2 JP 55064360 A JP55064360 A JP 55064360A JP 6436080 A JP6436080 A JP 6436080A JP S6143780 B2 JPS6143780 B2 JP S6143780B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- capstan
- magnetic
- magnetic head
- band
- 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
- 239000000463 material Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010959 steel 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
- G11B5/58—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
Landscapes
- Moving Of Heads (AREA)
Description
【発明の詳細な説明】
この発明は情報の書込み及び読出しを行う磁気
デイスク記憶装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk storage device for writing and reading information.
第１図は従来の磁気デイスク記憶装置の一例を
示す略平面図であつて、１は磁気デイスク、２は
磁気デイスク１の回転の中心となるスピンドル、
３は磁気ヘツド、４は磁気ヘツド３のキヤリツジ
（carriage）、５は鋼鉄製のバンドで、このバンド
により磁気ヘツド３の位置を制御するので磁気ヘ
ツド位置制御バンド５という。６はキヤプスタン
で、７はキヤプスタン６の軸上にバンド５を固定
するピンを示す。 FIG. 1 is a schematic plan view showing an example of a conventional magnetic disk storage device, in which 1 is a magnetic disk, 2 is a spindle which is the center of rotation of the magnetic disk 1;
3 is a magnetic head, 4 is a carriage for the magnetic head 3, and 5 is a band made of steel. Since this band controls the position of the magnetic head 3, it is called a magnetic head position control band 5. 6 is a capstan, and 7 is a pin for fixing the band 5 on the axis of the capstan 6.
磁気デイスク１はスピンドル２を中心にして一
定の回転速度で回転しており、情報の書込み及び
読出し（すなわち磁気記録およびこの記録の再
生）は磁気ヘツド３の直下の磁気デイスク１の部
分で行われる。したがつて書込み及び読出しの円
周方向の位置は書込み及び読出しが行われる瞬間
の磁気デイスク１の回転の位相で定まり、また書
込み及び読出しの半径方向の位置は磁気ヘツド３
の磁気デイスク半径方向の位置によつて定まる。
この半径方向の位置はバンド５によつて制御され
る。キヤプスタン６の回転角θはたとえばステツ
ピングモータ（stepping motor、すなわちpulse
motor）で正確に制御され、ピン７の位置が移動
するのでバンド５の位置が移動しキヤリツジ４の
位置を移動させ（図面の右又は左の方へ）、この
キヤリツジ４に固定されている磁気ヘツド３の位
置を移動する。 The magnetic disk 1 rotates at a constant rotational speed around a spindle 2, and information is written and read (that is, magnetic recording and reproduction of this recording) in a portion of the magnetic disk 1 directly below the magnetic head 3. . Therefore, the writing and reading positions in the circumferential direction are determined by the rotational phase of the magnetic disk 1 at the moment of writing and reading, and the writing and reading positions in the radial direction are determined by the rotational phase of the magnetic disk 1 at the moment when writing and reading are performed.
is determined by the radial position of the magnetic disk.
This radial position is controlled by band 5. The rotation angle θ of the capstan 6 is determined by, for example, a stepping motor (pulse).
The position of the pin 7 moves, which moves the position of the band 5, which moves the position of the carriage 4 (toward the right or left in the drawing). Move the position of head 3.
第２図は第１図に示すキヤプスタン６の回転と
磁気ヘツド３の位置との関係を示す説明図であつ
て、第２図において第１図と同一符号は同一部分
を示し、３１，３２は磁気ヘツド３の互に異る２
つの位置をそれぞれ示しているとする。位置３
１，３２において磁気デイスク１の回転の中心か
ら磁気ヘツド３までの距離はそれぞれx1，x2であ
るとする。また周囲温度ｔ℃のとき（x2−x1）＝
θｄ／２であるとする。ここにθはキヤプスタン
６の回転角、ｄはキヤプスタン６の直径である。
ところで、x1の長さは周囲温度が変化しても変化
しないように各部品要素が選定されているとす
る。すなわち位置３１は一種の基準点であるとい
うことができる。 FIG. 2 is an explanatory diagram showing the relationship between the rotation of the capstan 6 and the position of the magnetic head 3 shown in FIG. 1. In FIG. 2, the same reference numerals as in FIG. Two different magnetic heads 3
Suppose that the two positions are shown respectively. position 3
1 and 32, the distances from the center of rotation of the magnetic disk 1 to the magnetic head 3 are x 1 and x 2 , respectively. Also, when the ambient temperature is t°C, (x 2 − x 1 ) =
Assume that θd/2. Here, θ is the rotation angle of the capstan 6, and d is the diameter of the capstan 6.
By the way, it is assumed that each component element is selected so that the length of x1 does not change even if the ambient temperature changes. In other words, the position 31 can be said to be a kind of reference point.
周囲温度がｔ℃のとき、位置３１を基準とし、
キヤプスタン６をθだけ回転した位置３２に書込
んだとすれば（x2−x1）＝θｄ／２であるが、こ
の書込んだ情報を周囲温度がｔ゜＋△ｔ゜(C)にな
つた時に読出そうとしてキヤプスタンを位置３１
を基準にしてθだけ回転してもさきに書込んだ情
報を正確な位置で読出すことはできない。それは
磁気デイスク１とキヤプスタン６の線膨張係数が
異なるからである。磁気デイスク１の線膨張係数
を押釦α、キヤプスタン６の線膨張係数をβとす
ると、磁気デイスク１の長さx2−x1は（x2−x1）
α△ｔだけ変化し、キヤプスタン６の直径ｄはｄ
β△ｔだけ変化するので、キヤプスタン６の回転
角をθとしたときの位置ずれεは
ε＝｛（x2−x1）α−θｄβ／２｝△ｔ
＝（x2−x1）（α−β）△ｔ …(1)
となる。 When the ambient temperature is t°C, position 31 is the reference,
If the capstan 6 is written at the position 32 rotated by θ, then (x 2 - x 1 ) = θd/2, but this written information is written when the ambient temperature is t゜+△t゜(C). I moved the capstan to position 31 to read it when I got old.
Even if it is rotated by θ with reference to , the previously written information cannot be read out at the correct position. This is because the linear expansion coefficients of the magnetic disk 1 and the capstan 6 are different. If the linear expansion coefficient of the magnetic disk 1 is the push button α and the linear expansion coefficient of the capstan 6 is β, then the length x 2 −x 1 of the magnetic disk 1 is (x 2 −x 1 )
α△t changes, and the diameter d of the capstan 6 is d
Since it changes by β△t, the positional deviation ε when the rotation angle of the capstan 6 is θ is ε={(x 2 −x 1 )α−θdβ/2}△t = (x 2 −x 1 )( α−β)Δt…(1).
第３図は式(1)の関係を示す説明図であつて、図
において第２図と同一符号は同一意味を有し、位
置３３は周囲温度ｔ℃のとき位置３２にあつた磁
気デイスク１の部分が温度ｔ゜＋△ｔ℃において
とる位置であり、位置３４は周囲温度ｔ℃のとき
位置３２にあつた磁気ヘツドが温度ｔ゜＋△ｔ℃
においてとる位置である。 FIG. 3 is an explanatory diagram showing the relationship of formula (1), in which the same symbols as in FIG. The position 34 is the position taken at the temperature t°+△t°C, and the position 34 is the position that the magnetic head at position 32 takes when the ambient temperature is t°C.
This is the position taken in .
式(1)から明らかなように（x2−x1）が大きくな
り、△ｔが大きくなるほど位置ずれεは大きくな
り、書込んだデータを正確に読出すことができな
いという欠点があつた。 As is clear from equation (1), the larger (x 2 −x 1 ) and the larger Δt, the larger the positional deviation ε, which has the disadvantage that written data cannot be read accurately.
この発明は従来の装置における上述の欠点を除
去することを目的とし、この発明ではα＝βとす
ることにより式(1)で示される位置ずれεを消去し
たものである。 The purpose of this invention is to eliminate the above-mentioned drawbacks of conventional devices, and in this invention, the positional deviation ε shown in equation (1) is eliminated by setting α=β.
以下図面についてこの発明の実施例を説明す
る。第４図はこの発明の装置における位置ずれの
関係を示す説明図であつて、第３図と同一符号は
同一意味を有する。この発明ではキヤプスタン６
を磁気デイスク１と同一の線膨張係数αを有する
材料で構成するので、第３図におけるβは第４図
においてはαで置き換えられ、したがつて第４図
において位置３３と３４とはよく一致することに
なる。 Embodiments of the invention will be described below with reference to the drawings. FIG. 4 is an explanatory diagram showing the relationship of positional deviation in the apparatus of the present invention, and the same symbols as in FIG. 3 have the same meanings. In this invention, the capstan 6
is made of a material having the same coefficient of linear expansion α as the magnetic disk 1, β in FIG. 3 is replaced by α in FIG. 4, and therefore positions 33 and 34 in FIG. 4 coincide well. I will do it.
なお、以上はステツピングモータを用いてキヤ
プスタン６の角度θをオープンループ（open
loop）式に位置決めする場合について説明した
が、クローズドループ（closep loop）式に制御
する場合についてもこの発明によれば時間に対す
る伸びの変化率すなわち熱時定数を合せることが
できるので、位置ずれを除去するための有効な手
段を得ることができる。 In addition, in the above, the angle θ of the capstan 6 is set in an open loop using a stepping motor.
Although positioning has been described using a closed loop method, according to the present invention, the rate of change in elongation with respect to time, that is, the thermal time constant, can be matched, so that positional deviation can be prevented. An effective means for removing it can be obtained.
以上のように、この発明によれば、磁気ヘツド
の位置ぎめに対する温度による誤差を減少し安定
な位置決めができ、ひいては同一面積の磁気デイ
スクで記憶できる情報量を増加することが可能と
なる。 As described above, according to the present invention, it is possible to reduce temperature-related errors in the positioning of the magnetic head, to achieve stable positioning, and to increase the amount of information that can be stored on a magnetic disk of the same area.
第１図は従来の磁気デイスク記憶装置の一例を
示す略平面図、第２図は第１図に示すキヤプスタ
ンの回転と磁気ヘツドの位置との関係を示す説明
図、第３図は従来の装置における位置ずれの関係
を示す説明図、第４図はこの発明の装置における
位置ずれの関係を示す説明図である。
図において１は磁気デイスク、３は磁気ヘツ
ド、４はキヤリツジ、５は磁気ヘツド位置制御バ
ンド、６はキヤプスタンである。なお、図中同一
符号は同一又は相当部分を示す。
FIG. 1 is a schematic plan view showing an example of a conventional magnetic disk storage device, FIG. 2 is an explanatory diagram showing the relationship between the rotation of the capstan shown in FIG. 1 and the position of the magnetic head, and FIG. 3 is a conventional device. FIG. 4 is an explanatory diagram showing the relationship of positional deviation in the apparatus of the present invention. In the figure, 1 is a magnetic disk, 3 is a magnetic head, 4 is a carriage, 5 is a magnetic head position control band, and 6 is a capstan. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
報の書込み及び読出しを行うための磁気ヘツド
と、この磁気ヘツドの上記磁気デイスク半径方向
の位置を制御する磁気ヘツド位置制御バンドと、
上記磁気デイスクと同一の線膨張係数を有する材
料で構成されモータによつて回転されるキヤプス
タンと、このキヤプスタンにより上記位置制御バ
ンドを駆動し上記位置制御バンドのその長さ方向
の位置に対し上記キヤプスタンの回転角に比例す
る変位を与えるバンド駆動機構とを備えたことを
特徴とする磁気デイスク記憶装置。1. A magnetic disk, a magnetic head for writing and reading information on the magnetic disk, and a magnetic head position control band for controlling the position of the magnetic head in the radial direction of the magnetic disk;
a capstan made of a material having the same coefficient of linear expansion as the magnetic disk and rotated by a motor; A magnetic disk storage device comprising: a band drive mechanism that provides a displacement proportional to the rotation angle of the magnetic disk storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6436080A JPS56159867A (en) | 1980-05-15 | 1980-05-15 | Magnetic disk memory device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6436080A JPS56159867A (en) | 1980-05-15 | 1980-05-15 | Magnetic disk memory device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56159867A JPS56159867A (en) | 1981-12-09 |
| JPS6143780B2 true JPS6143780B2 (en) | 1986-09-30 |
Family
ID=13256008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6436080A Granted JPS56159867A (en) | 1980-05-15 | 1980-05-15 | Magnetic disk memory device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56159867A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57172572A (en) * | 1981-04-15 | 1982-10-23 | Fujitsu Ltd | Open loop type disk device |
| US4959740A (en) * | 1983-11-18 | 1990-09-25 | Canon Denshi Kabushiki Kaisha | Disc recording and/or reproducing apparatus including means for minimizing the effects of temperature changes |
| US5309624A (en) * | 1983-11-18 | 1994-05-10 | Canon Denshi Kabushiki Kaisha | Method of making a disc recording and/or reproducing apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4878916A (en) * | 1972-01-24 | 1973-10-23 | ||
| JPS5211912A (en) * | 1975-07-18 | 1977-01-29 | Hitachi Ltd | Magnetic head position settlement apparatus |
| JPS53123911A (en) * | 1977-04-05 | 1978-10-28 | Shugart Associates | Positioning mechanism for reading*writing head of recorder reproducer employing magnetic record disc |
| JPS54113312A (en) * | 1978-02-24 | 1979-09-04 | Fujitsu Ltd | Magnetic disc device |
-
1980
- 1980-05-15 JP JP6436080A patent/JPS56159867A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4878916A (en) * | 1972-01-24 | 1973-10-23 | ||
| JPS5211912A (en) * | 1975-07-18 | 1977-01-29 | Hitachi Ltd | Magnetic head position settlement apparatus |
| JPS53123911A (en) * | 1977-04-05 | 1978-10-28 | Shugart Associates | Positioning mechanism for reading*writing head of recorder reproducer employing magnetic record disc |
| JPS54113312A (en) * | 1978-02-24 | 1979-09-04 | Fujitsu Ltd | Magnetic disc device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56159867A (en) | 1981-12-09 |
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