JPS5990214A - Head for vertical magnetization - Google Patents
Head for vertical magnetizationInfo
- Publication number
- JPS5990214A JPS5990214A JP20062482A JP20062482A JPS5990214A JP S5990214 A JPS5990214 A JP S5990214A JP 20062482 A JP20062482 A JP 20062482A JP 20062482 A JP20062482 A JP 20062482A JP S5990214 A JPS5990214 A JP S5990214A
- Authority
- JP
- Japan
- Prior art keywords
- curved surface
- magnetic pole
- main magnetic
- guide plate
- head
- 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
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/32—Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing
Landscapes
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
本梵明Qi車1自4M化用ヘッドに関するものであり、
特に用1差性回転イ1妊気ラーイスクの安定な回転状態
を゛実曳l−債報伯号を商い稍展にてイー気記録11+
生できる!国的イ1d化記録用ヘッドに関するものであ
る。[Detailed description of the invention] The present invention relates to a head for converting a Brahma Qi vehicle into a 1-car 4M vehicle,
In particular, the stable rotational state of the 1st difference rotation 1st pregnancy raisk was demonstrated by the 11+
I can live! This relates to a nationally recognized 1D recording head.
近年、記録媒体の厚み方間の脩化状態ヶ利用し重密度な
情報信号記録を會−fう隼11〕イみ化記録力式が注目
されている。この垂I脩化記録力式に展・ける記録+1
1生用ha気ヘツドとして神々提案がなされ一〇いる7
J1、代表的な半面磁化用ヘッドとして、単(ホ)桶型
の主磁極励磁型ヘッドが知られ1いる。すなわち、王峰
棚励イ蒔型ヘッドとは第7図に不ずごとく巻線/3が施
された短冊型の商透磁性γW膜より成る構成のものであ
って(該構成物を上磁極/弘と称する)、その先端部に
記録媒体//のイ(d外曲/2を摺動きせて記録・(1
+生を行なうものである。In recent years, attention has been paid to an imprinted recording system that utilizes the thinning state of the recording medium to record high-density information signals. This record can be expressed in the form of recording power + 1
1. There are 10 proposals made by the gods as hazuki heads for living.7
J1. A single-tub type main pole excitation type head is known as a typical half-plane magnetization head. In other words, the Wangho shelf excitation type head has a configuration consisting of a strip-shaped quotient magnetically permeable γW film with a winding /3 as shown in FIG. (referred to as Hiro), the tip of the recording medium // is recorded by sliding it (d outside song / 2).
+It is something that carries out life.
この動作原理は巻線/3に信号型’lA”bを向えるこ
とにより励磁芒れた上値樟/弘からの脩東に依り、記録
媒体//の磁性層/2を厚さ方向に磁化さぜ、すなわち
、11月0にイみ他心せて情報情月の記録音イ1うもの
である。また、記球媒41+//の(18性層/2に記
録された情報18号の再生を行う場合には該(+U性層
中に沖9的に磁化された残留イみ化からの41侵束によ
って主1超極/≠の簡透(1赳1(ト傅)腐が磁化さt
シ、その41東により在線/3の端チ間に′11L組全
1唸起ぜ(7めることにより行われるものである。The principle of this operation is based on Shuto's work from Hiromu, which is excited by directing the signal type 'lA'b to the winding /3, and magnetizes the magnetic layer /2 of the recording medium in the thickness direction. In other words, in November 0, the recorded sound of the information information month is 1.In addition, the information recorded in the recording medium 41+// (18 sex layer/2) is recorded. In the case of regeneration, the main 1 superpole/≠ simple penetration (1 赳1 (Tofu) rot magnetized
By the 41 east, all 1 sets of '11L are raised between the ends of the line/3 (this is done by setting 7).
ここで、このイ\Rな主し+ki棚励イ1赳型ヘッドを
用いて記録及び4’l−) ’J:、をイjなう揚台、
土もム極と記録媒体との間の距i4F、すなわち+J+
gl’J分hlh長が記録、円柱、特性に渚しい影1;
・η介もたらずことか9a+らノ1.でいる。Now, record using this I\R main +ki shelf excitation I1 type head, and
The distance i4F between the soil pole and the recording medium, that is +J+
gl'J minute hlh length recorded, cylinder, characteristic shadow 1;
・η 9a + ra no 1. I'm here.
す々わら出生時に於てtJ1記録媒体と主磁極との間i
?A *すなわち分離長をdとし、記α°I波長全λと
するとこの分子41Eによる損失はd/λに比例してし
1い、外/こ記録時に於ても、記録媒体と主峰イ市(と
の間1#;iが離れるに従って主磁極がらの磁界の分4
jしこ鋭さがなくなってし寸うのである。従ってがかる
jl(的4+、+1化用ヘッド昏・用いて記録及び11
]生をイJなう場イヤK &;、を分i’fll長を小
8くし、かっこの分離」k肴・一定に保つことか4i1
(めて111要なことである。At the time of birth, the distance between the tJ1 recording medium and the main magnetic pole is
? A *That is, if the separation length is d and the total wavelength of α°I is λ, the loss due to this molecule 41E is proportional to d/λ. (1#; as i moves away, the magnetic field from the main pole
It almost loses its sharpness. Therefore, it takes a jl (target 4+, +1 head coma, record and use 11
]I don't want to live in a place where I don't want to live.
(There are 111 important things.
しかしながら、かかる主磁極11jJ、14B型ヘツド
4〜用いて、+!’!1坪に回転する可撓性円41y状
の(心気ディスクに記録全行なっだシ、あるいは該ディ
スクに記録された情報1t1号を再生しようとすると次
の欠点を生じる。即ちこの方法においてに1イ1赳気テ
イスクを重速に回転ぴせた状態で主磁極先!7tln部
Vご摺動させることにより磁気ディスクに対して記録し
またイ厩気テイスクに記録された1−号111報金出生
するのであるが、磁気ディスクに1回転による退心力で
安定なlIl頃は行なわれるものの、1−1J悦性でか
つ傅いために例えば該ディスクにヘッド先端を・接触さ
せたたけでも著しいばたつきを4I:、してし千いν定
な回転が得られなくなL(sq旧性の商い安定した記録
+1+/−JE、をイ丁なうために磁夕tディスクと主
(丘A小との間に安定した]と動状態を維持づせイ、こ
とかでさなくなってしまう。However, by using such a main magnetic pole 11jJ and a 14B type head 4~, +! '! When a rotating flexible circle 41y-shaped (1 tsubo) is completely recorded on a disk, or when an attempt is made to reproduce the information 1t1 recorded on the disk, the following drawback occurs. A1 While the magnetic tape is rotating at a heavy speed, the main magnetic pole tip !7tln section V is slid to record on the magnetic disk. Although the magnetic disk has a stable rotation due to the receding force caused by one rotation, in order to provide 1-1J pleasure and durability, for example, when the head tip is brought into contact with the disk, it causes significant flapping. :, Then I couldn't get constant rotation, and in order to maintain a stable record of L(sq old) +1+/-JE, I changed the magnetic disk and the main (Oka A small). If it stabilizes in the meantime, it will maintain a dynamic state, but it will stop working.
本発明は上述のQIJき問題点全解決するf(めになさ
7’したものであって、烟的(重化記録方式の磁気記録
再生装圓に於て−uJ怖性イみ気ディスクと王4M 4
+ikとの摺動状、鴨が極めて、安定でめり、I+:v
旧/1:の商い状態を′各局に作り出せる無1〔1樹化
川ヘツドを提供するものである。すなわち、本発明の目
的に、第/にね」匍性イ1h気ディスクを安定に回ψム
させる哄I口磁化用<mt気ヘッドを提供するものであ
り、第2に0」イ悄性イ厩気ディスクとの(H!+υ〕
状態な表定に1(11−持させる垂的磁他用イミ気ヘッ
ドを提供するものである。The present invention is intended to solve all of the above-mentioned QIJ problems, and in the magnetic recording/reproducing system of the overlapping recording method, King 4M 4
Sliding condition with +ik, duck is extremely stable, I+:v
It provides a head that can create the trading status of the old /1 at each station. That is, the object of the present invention is, firstly, to provide a magnetic head for magnetization that stably rotates a magnetic disk with 0'' flexibility. (H! + υ) with the yi-ki disk
The object of the present invention is to provide an optical head for perpendicular magnets that has a state representation of 1 (11).
即ち本発明は主磁極と条内センとを記1A媒体を介して
対同配置しで)成る止4修杯励イ心型垂曲(厳化用ヘッ
ドV(おいで、主磁極と案内板との対向111)を記録
媒体の即動をシカ!化する構造にしたこと全特霞とする
半面磁化用ヘッドであり、史に主磁極と案内板とを!記
録媒体ケ介して対同配置して成る上値イ1カ励イ1任!
4′!垂+1’1(lμ化+r+ヘッドに於て凸状曲面
を南する主41!dt Ark文付体と凹状曲面をイテ
する案内板分有し、11へ一ド4+’d柳支持体の凸状
間1rjIと該案内板の凹状曲面とを記録媒体を介して
対同配置L %核上(1帽11μ支持体の凸状曲面と該
案内板の凹状曲面とでJ戊す対向空間内に−F磁イ・・
μ先端部を配置6シたことを4’J徴とする!1!的イ
1d化用ヘッドである。That is, the present invention has a main magnetic pole and a guide plate arranged in parallel with each other via a medium 1A. It is a half-plane magnetization head that has a structure that reduces the instantaneous movement of the recording medium with the opposing 111), and the main magnetic pole and the guide plate are arranged in the same direction through the recording medium. The top price is 1 and 1 is encouraging!
4′! Vertical + 1'1 (lμ + r + main 41! dt Ark patterned body and a guide plate that goes south on the concave curved surface in the head, 11 to 4 + 'd convex of the willow support The concave curved surface of the guide plate and the concave curved surface of the guide plate are arranged in the same space on the L% nucleus (within the opposing space J formed by the convex curved surface of the support 11μ and the concave curved surface of the guide plate). -F magnet...
The 6-point arrangement of the μ tip is considered a 4'J feature! 1! This is a head for making targets 1D.
以−ト’ 、 7I4コ図を参照して史に1、日」1)
に説明する。1)
Explain.
商Jヅ;、 MG性γす71開より成る主(194ii
++ 2≠が非磁性支持体−23′に挾まれており、該
非磁性支持体2夕はその111部及び後部に回転(18
気デイスク21とほぼ平j−Jをなず主(1仔極支持体
r1す都)4何q;li、27及び同じく回1す;磁気
ディスク2/とほぼ平行をなす主磁極支持体後部平坦部
、2と全型し、かつ主4t44中文持体先\’j6部2
2は該山車黒部に対し凸IK曲面に月3成3 it 。Commercial Jzu;, The main body consisting of MG sex gamma 71 openings (194ii
++ 2≠ is sandwiched between non-magnetic supports -23', and the non-magnetic supports 2 are rotated (18
The rear part of the main pole support, which is approximately parallel to the magnetic disk 21 and approximately parallel to the magnetic disk 21, is located approximately parallel to the main pole support r1. Flat part, 2 and full type, and main 4t44 Chinese holding body end\'j6 part 2
2 has a convex IK curved surface with respect to the black part of the float.
該凸状間+m ノBs上rls(y−が主IPi (+
’Jh先9110となるI>h i/こ1t1J透イ1
帽主γ・j1換である。(9致4也が(゛配設されでい
る。条1ノ4(j叉2tυ2非(I(仝性拐和あるいは
商Jら慟11:桐不Iよ(月Jkす、主!+H極支持体
先端部2りの凸状間INと対間する輻;而に形成された
案内&凹状曲1III30と主磁【峠極支持体前部平」
具部27に対向し、かつ該主磁極11J部平坦部、27
に平行となるように該条内板2乙の端面に形J戎された
案内板嶺部平坦部3/と主(+f4 j6J支持休復部
平u−1一部λgにズJ’ liJ L 、、かつ該主
磁極支持体代H91曽11−坦部2gと平何となるよう
に該案内板嶺部平坦部32とをイ4″し、該条内1y、
凹状曲jilt 30と条内板1」I団15平坦部3/
と案内板1次部平■部32とをイイする輻;曲を上値搏
3支持体2jに対向して配設し、かつ主41Hl+1+
文拌j体先!γ++11部!りの凸状間11uと案内板
の凹状曲面30との間1イ・iか主1173極り持体1
111都平坦j%ls、Z7と案内板[11都31′−
坦t〜1531との間隙及び上値イ伊支持体後t115
平坦部2Irと案内板後部3:l−黒部32との11旧
イはりも広く、す乃、わち、該両曲]F1]対向部に葉
間に形成するように主磁極支持体先立;品部2?の凸状
11旧イ1」及び案内板凹状曲間30を形成する。rt
?+透修i’J:1j11+b(より成る上値4iJ(
,2グににL巻線23か巻1マ]しノられでいる。Between the convexities +m no Bs rls (y- is the main IPi (+
'Jh becomes 9110 I>h i/ko1t1JTorui1
It is a cap principal γ・j1 conversion. (The 9th and 4th are () arranged. Article 1 no 4 (J 2tυ 2 non (I) The convex space IN on the support tip 2 and the convex opposite thereto; the guide & concave curve 1III30 formed therein and the main magnetic field
A flat part of the main pole 11J facing the tool part 27, 27
The flat part 3/ of the guide plate ridge is cut out in the end face of the inner plate 2 so that it is parallel to , , and the guide plate ridge flat part 32 is set 4" so that the main magnetic pole support body width H91 - flat part 2g is flat, and the inside of the line 1y,
Concave curved jilt 30 and inner plate 1” Group I 15 flat part 3/
and the guide plate primary flat part 32;
Ahead of the sentence! γ++11 parts! Between the convex space 11u of the guide plate and the concave curved surface 30 of the guide plate 1a/i or main 1173 pole holder 1
111-to flat j%ls, Z7 and information board [11-to 31'-
Gap between flat t~1531 and upper price t115 after support
The flat part 2Ir and the rear part of the guide plate 3:l-black part 32 are also wide, and the main magnetic pole support is placed in front so as to form a space between the leaves in the opposite part. ; Shinabe 2? A convex portion 11 of the guide plate and a concave curved portion 30 of the guide plate are formed. rt
? + Transparency i'J: 1j11+b (Upper price 4iJ (
, L winding 23 or winding 1 is connected to the 2nd wire.
本発明の十的イm化用ヘッドを用いbJ撓性(■任気デ
ィスクに対し記録・角化を行う場合、該6J怖件イ鑞気
テイスク2/は上記主磁極支持体、2夕と案内板2zの
対同葉間内台商運に同転する。かかる場合、l1111
11:磁気ディスクの商埋回転につれて、該回転イ]妊
気テイスクと主磁極支持体2jとの間及び回転磁気ディ
スクと案内板2乙との間に安定な、定常な′イど気肋流
が形成される。回転4市気デイスクはこれら″ヴ定な柴
気ハ゛!4流によってはたつくことなく安定V(回Il
iムする。しかも、回転(「θ気ディスク、2/と案内
板2乙との間に形成されアL窄気層尚tま案内板!乙の
凹状曲面部′慴間に於て急激に流速が落ち1回転4気デ
イスク2/と主磁極支持体2jの間に形成されプこも1
4気層流に対してト1圧になるために回転(巡見]=イ
スクが案内板(tillに圧力を受けで曲面を形IJV
、した状態に安定化し回転する。When performing recording and angularization on a disk using the head for imaging of the present invention, the above-mentioned main magnetic pole support, The information board 2z will be changed to the same time as the one in the same direction.In such a case, l1111
11: As the magnetic disk rotates, a stable and steady pneumatic flow is generated between the rotating magnetic disk and the main magnetic pole support 2j and between the rotating magnetic disk and the guide plate 2b. is formed. The rotating 4-speed air disk is stable and stable without being fluctuated by these 4 currents.
i am. Furthermore, due to the rotation (the concave air layer formed between the θ air disk 2/ and the guide plate 2), the flow velocity suddenly decreases between the concave curved surface of the guide plate 2 and the guide plate 1. A magnetic pole 1 is formed between the rotating 4-metal disk 2/ and the main pole support 2j.
Rotation (touring) to achieve 1 pressure for 4 gas laminar flow = Isk receives pressure on the guide plate (till) and forms a curved surface IJV
, stabilizes and rotates.
回転磁気ディスクの径方同に本発明の磁気ヘッドケ移j
lvJきせてもこの状態は変らなく、回トム(磁気ディ
スクの女定回lIIムは帷荀さjしる。The magnetic head of the present invention is moved in the same direction as the diameter of the rotating magnetic disk.
Even if lvJ is used, this condition does not change, and the magnetic disk's female constant rotation rate remains constant.
本発明の」■的4rIi他用ヘッド奮用いることにより
回転磁気ディスクのはたつきがIt < 、(’% m
J状f焦カ艮好K 4iF、持さitだ回転が行え、′
ゲ’7シ7こ相同の(:iJい商蓄度の記録が達成さJ
した。By making full use of the ``4rIi'' head of the present invention, the flapping of the rotating magnetic disk can be reduced to It < , ('% m
J-shaped f focusing force K 4iF, it can be rotated,'
Ge'7shi7 homologous (: iJ record of commercial accumulation achieved J
did.
以上の説明から明らかな様に本発明は回転磁気ディスク
の回甲ムの安定化、ずなわち、主磁ミ捗との摺動状態の
安定化を図るために七afl Ji6.支持、体及び4
む内板の相対する両メ」同曲にそのに電化効未ケ1.′
「たせたものであって、回転([■気テイスクを帛に主
磁滋イ萌文J守イ木ArJ用3平坦r113及び上値イ
(リイ文4寺1本イ叉?11(平」14部と案内板羽部
平坦部及び案内板仮部平J!、、I、 r2+)とに事
例に、j、南北回転きせることかでき、かつ回転磁気デ
ィスクVζ対して、市に安定した摺動状態でI!Il望
の情報信号を磁気記録、再生することか出来る。As is clear from the above description, the present invention aims to stabilize the rotation arm of a rotating magnetic disk, that is, to stabilize the sliding state with the main magnetic disk. support, body and 4
1. There is no electrification effect on the same song. ′
``It is a thing that has been raised, and a rotation ([■Ki Teisuku is used as a main magnet Shigeru I Moe Bun J Mori I Tree ArJ 3 flat r 113 and upper price I (Rii sentence 4 Temple 1 I ka? 11 (flat) 14 For example, the flat part of the guide plate wing part and the flat part of the guide plate temporary part J!, I, r2+) can be rotated north-south, and have stable sliding relative to the rotating magnetic disk Vζ. In this state, it is possible to magnetically record and reproduce desired information signals.
第7図は従来の単イみ伸型上値極励値)−C1Jヘツド
の断1114図である。
//は垂面イ戯化、;I2録用媒体
/ 261 垂1−+ イ+11化記1、に用it’/
;体//の’ad i’−IE 1m/3は巻線
/弘は商込イ瀬性博111=より成る上値4リベ第λ図
は木光明の柚1011蝕化川ヘッドの111面図である
。
2/は回転磁気ディスク
22は回転磁気ディスク2/の磁性層
λ3は極線
2≠は商追輯性l″−I/j俟よシ成る1〕磁4・広2
jQま非(み性支持体
、2zは非41剋性あるいは商nj f+H1生案内4
反、27は主値み極文(41体「J11部平坦部2には
」:、<18) 4・<It Q ]’#r体段部平、
t!lj、 C41(29は主磁極支持体先端j916
3θ(d条内板凹状曲面
3/Q」案内槻旧1イ13平坦部
32は案内根イ友部平坦部
33は同・11ム(磁気ディスクの回11t7<山間を
7Fす矢印である。
第1図
第2図FIG. 7 is a cross section 1114 of a conventional single expansion type upper value extreme value)-C1J head. // is for Takumen Igi conversion, ; I2 record medium/ 261 Tate 1-+ I+11 conversion record 1, it'/
;Body//'s 'ad i'-IE 1m/3 is the winding/Hiroshi is the upper value of 4 libs consisting of 111 = Commercial Ise Sohiro Figure λ is Kikomei's Yuzu 1011 Eclipse head 111 view It is. 2/ is the rotating magnetic disk 22, the magnetic layer λ3 of the rotating magnetic disk 2/ is the polar line 2≠ is the quotient tracking property l''-I/j 1] magnetic 4, wide 2
jQ mahi (Misei support, 2z is non-41 kusei or quotient nj f+H1 life guide 4
On the other hand, 27 is the principal value and the polar sentence (41 body "J11 part flat part 2":, <18) 4・<It Q ]'#r body Danbe flat,
T! lj, C41 (29 is the main magnetic pole support tip j916 3θ (d inner plate concave curved surface 3/Q) guide ram old 1i 13 flat part 32 is the guide root 11t7<This is an arrow pointing to 7F between mountains. Figure 1 Figure 2
Claims (1)
置してIjkる主(ム極励磁型Q i百(重化用ヘッド
において、主磁極と案内板との対同面を記録媒体の連動
を安定化する構造にしたことを特徴とする垂直(戯化用
ヘッド。 (2) 主磁極と案内板と(C−記録媒体を介して対
向配置して成る主磁極1rih am型俳的イみ他用ヘ
ッドに於て凸状)11」曲ケイイする主磁極支持体と凹
状曲間を有する案内板を有し、核上(み相く支持体の凸
状曲面と該案内板の凹状曲面とな°記録媒体を介して対
向配置し、該七−4rm支持体の凸状曲面と該案内板の
凹状曲間とでIJkす対同柴凹円に主磁極先端t115
全配置l−たこと4・特敵とする車面磁化用ヘッド。[Claims] A vertical (playing head) characterized by having a structure that stabilizes the interlocking of the recording medium on the same surface as the main pole and the guide plate (C). The main magnetic pole consists of a main magnetic pole support having a concave curve of 11" (convex in the other head), and a guide plate having a concave curve. The convex curved surface of the 7-4rm support and the concave curved surface of the guide plate are arranged opposite to each other via the recording medium, and the IJk is mainly formed between the convex curved surface of the 7-4rm support and the concave curved surface of the guide plate. Magnetic pole tip t115
All layouts 4. Head for magnetizing the car surface as a special enemy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20062482A JPS5990214A (en) | 1982-11-16 | 1982-11-16 | Head for vertical magnetization |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20062482A JPS5990214A (en) | 1982-11-16 | 1982-11-16 | Head for vertical magnetization |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5990214A true JPS5990214A (en) | 1984-05-24 |
Family
ID=16427469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20062482A Pending JPS5990214A (en) | 1982-11-16 | 1982-11-16 | Head for vertical magnetization |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5990214A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6111903A (en) * | 1984-06-27 | 1986-01-20 | Fuji Photo Film Co Ltd | Magnetic head device |
WO1986003616A1 (en) * | 1984-12-03 | 1986-06-19 | Olympus Optical Co., Ltd. | Vertical magnetic head |
US6771462B1 (en) * | 1999-09-20 | 2004-08-03 | Seagate Technology Llc | Perpendicular recording head including concave tip |
-
1982
- 1982-11-16 JP JP20062482A patent/JPS5990214A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6111903A (en) * | 1984-06-27 | 1986-01-20 | Fuji Photo Film Co Ltd | Magnetic head device |
WO1986003616A1 (en) * | 1984-12-03 | 1986-06-19 | Olympus Optical Co., Ltd. | Vertical magnetic head |
US5003423A (en) * | 1984-12-03 | 1991-03-26 | Olympus Optical Company Ltd. | Vertical recording magnetic head |
US6771462B1 (en) * | 1999-09-20 | 2004-08-03 | Seagate Technology Llc | Perpendicular recording head including concave tip |
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