JP5646435B2 - データストレージシステム、方法および装置 - Google Patents
データストレージシステム、方法および装置 Download PDFInfo
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- JP5646435B2 JP5646435B2 JP2011240748A JP2011240748A JP5646435B2 JP 5646435 B2 JP5646435 B2 JP 5646435B2 JP 2011240748 A JP2011240748 A JP 2011240748A JP 2011240748 A JP2011240748 A JP 2011240748A JP 5646435 B2 JP5646435 B2 JP 5646435B2
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- Prior art keywords
- heating element
- recording head
- compensation resistor
- resistance value
- voltage drop
- Prior art date
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- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
-
- 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
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/607—Control of flying height using thermal means
-
- 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
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/6076—Detecting head-disk contact
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Magnetic Heads (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Description
データストレージシステムは、一般に、情報を読取ったり情報を記録媒体に書込んだりする1つ以上の記録ヘッドを含む。しばしば、記録ヘッドとその関連する媒体との間に比較的狭い距離または間隔を設けることが望ましい。この距離または間隔は、「フライハイト(fly height)」または「ヘッドと媒体との間隔(head-to-media spacing)」として公知である。このヘッドと媒体との間隔を小さくすることにより、記録ヘッドは、通常、媒体からの読取および媒体への書込の両方をより適切に行なうことができる。
一実施例においては、データストレージシステムは、記録ヘッドおよび補償抵抗器を含む。記録ヘッドは加熱素子を備える。補償抵抗器は、加熱素子と電気的に直列であり、記録ヘッドの外部にある。
この開示の実施例は、データストレージシステムにおけるヘッドと媒体との間隔を測定または決定するのに有用であり得る装置および方法を含む。一実施例においては、記録ヘッドは、交流によって電力供給される加熱素子を含む。交流は、加熱素子の温度を変動させる。以下により詳細に説明するように、温度変動の振幅は、記録ヘッドとその関連する記録媒体との間の距離に依存している(すなわち、温度変動の振幅はヘッドと媒体との間隔に依存している)。たとえば、一実施例においては、記録ヘッドは、記録ヘッドがその記録媒体から離れている場合(すなわち、ヘッドと媒体との間隔が0よりも大きい場合)と比べて、その記録媒体と接触している(すなわち、ヘッドと媒体との間隔がゼロである)ときにより多くの熱を失う。これは、一例として、ヘッドと媒体との間隔がゼロよりも大きい場合に起こる固体と気体との接触とは対照的に、ヘッドと媒体との間隔が0である場合に起こる固体と固体との接触によって、熱がより高い速度で記録ヘッドから放散されてしまうことによるものである。熱損失に差があることで、結果として、加熱素子の両端における温度変動の振幅が異なってくる。少なくともいくつかの実施例においては、装置および方法は、温度変動の振幅を測定し、そして、この振幅を用いて記録ヘッドと媒体との間隔を決定することを可能にする。
ここで、I(t)は、時間tにおける瞬間電流であり、I0は電流振幅であり、ωは角周波数(たとえば、ラジアン/秒)である。
式2:P(t)=V(t)I(t)
ここで、P(t)、V(t)およびI(t)はそれぞれ、回路についての、時間tにおける瞬時電力、電圧および電流である。駆動電圧V(t)および電流I(t)は常に、ともに正であるかまたはともに負であり、このため、電力P(t)は常に正となる。結果として生じる電力の角周波数が駆動電流の角周波数の2倍(すなわち、2ω)であることにも留意されたい。
ここで、ΔTDCは、温度上昇の直流成分であり、ΔTACは、温度変動の交流成分の振幅である。
ここで、dは熱波の浸入深さであり、Dは材料の熱拡散率(thermal diffusivity)である。加熱周波数が低い場合、熱の侵入深さは大きくなる(すなわち、加熱素子のまわりの大量の材料が加熱される)。これにより、結果として、加熱素子が記録媒体と接触するほど近接した場合に(すなわち、ヘッドと媒体との間隔が0に近づくにつれて)、加熱素子の温度が上昇して熱境界条件に対する感度が低下する。加熱周波数が高い場合、熱の侵入深さは小さくなる(すなわち、加熱素子のまわりの少量の材料が加熱される)。これにより、結果として、加熱素子が記録媒体と接触するほど近接した場合に、加熱素子の温度が上昇して熱境界に対する感度が高くなる。したがって、比較的高い加熱周波数であれば、ヘッドと媒体との間隔を決定するのにより望ましいだろう。しかしながら、加熱周波数は、ヘッドとディスクとの界面における熱伝導の寄与を除外するように、熱を極めて小容量に制限するよう高く設定することができない。
Claims (7)
- 抵抗値が温度とともに変化する加熱素子を有する記録ヘッドと、
前記加熱素子に交流電力を供給する交流電源と、
前記加熱素子と電気的に直列であり、前記記録ヘッドの外部にある補償抵抗器とを含み、前記補償抵抗器は前記交流電源により交流電力を供給されて前記加熱素子の抵抗値の変化の直流成分を相殺するように前記加熱素子の抵抗値を補償し、前記加熱素子の温度変動に非依存の抵抗値と前記補償抵抗器の直流抵抗値とが少なくともほぼ等しい、データストレージシステム。 - 前記加熱素子の抵抗値と前記補償抵抗器の抵抗値との差を補償する乗算回路をさらに含む、請求項1に記載のシステム。
- 前記加熱素子から電圧信号の一部を抽出するロックイン増幅器をさらに含む、請求項1に記載のシステム。
- 記録媒体をさらに含み、
前記加熱素子は、前記記録ヘッドのうち記録媒体に最も近接する部分となるように、前記記録ヘッド上に位置する、請求項1に記載のシステム。 - 前記加熱素子は金属線または膜を含み、温度センサとしても機能する、請求項1に記載のシステム。
- 温度とともに抵抗値が変化する記録ヘッドの加熱素子を前記記録ヘッド外部の補償抵抗器に電気的に直列に接続するステップと、
前記加熱素子および前記補償抵抗器に交流を印加するステップとを備え、前記補償抵抗器は前記加熱素子の抵抗値の温度変動に依存しない成分の抵抗値と同じ抵抗値を有し、
前記加熱素子の両端の電圧降下を測定するステップと、
前記補償抵抗器の両端の電圧降下を測定するステップと、
前記加熱素子の両端の電圧降下から前記補償抵抗器の両端の電圧降下を減じて前記加熱素子の電圧変化の交流成分を抽出するステップとを含む、方法。 - 温度とともに抵抗値が変化する記録ヘッドの加熱素子を前記記録ヘッド外部の補償抵抗器に電気的に直列に接続するステップと、
交流を第1の角周波数で前記記録ヘッドの前記加熱素子および前記補償抵抗器に印加するステップと、
前記記録ヘッドの前記加熱素子および前記補償抵抗器それぞれの両端の電圧降下を測定するステップと、
前記記録ヘッドの加熱素子の電圧降下から前記補償抵抗器の電圧降下を減算して前記記録ヘッド加熱素子の電圧降下の直流成分を補償して交流成分を抽出するステップとを含み、前記交流成分は、前記第1の角周波数の周波数の3倍の周波数を有し、かつ前記加熱素子の温度変動に非依存の抵抗値と前記補償抵抗器の直流抵抗値とが少なくともほぼ等しい、方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US12/941,461 | 2010-11-08 | ||
US12/941,461 US8523312B2 (en) | 2010-11-08 | 2010-11-08 | Detection system using heating element temperature oscillations |
Publications (2)
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JP2012104213A JP2012104213A (ja) | 2012-05-31 |
JP5646435B2 true JP5646435B2 (ja) | 2014-12-24 |
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JP2011240748A Expired - Fee Related JP5646435B2 (ja) | 2010-11-08 | 2011-11-02 | データストレージシステム、方法および装置 |
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US20140029402A1 (en) | 2014-01-30 |
US20120113207A1 (en) | 2012-05-10 |
US9607659B2 (en) | 2017-03-28 |
US8523312B2 (en) | 2013-09-03 |
JP2012104213A (ja) | 2012-05-31 |
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