JPS6185613A - Multitrack thin film magnetic head assembly - Google Patents

Multitrack thin film magnetic head assembly

Info

Publication number
JPS6185613A
JPS6185613A JP20642784A JP20642784A JPS6185613A JP S6185613 A JPS6185613 A JP S6185613A JP 20642784 A JP20642784 A JP 20642784A JP 20642784 A JP20642784 A JP 20642784A JP S6185613 A JPS6185613 A JP S6185613A
Authority
JP
Japan
Prior art keywords
thin film
film magnetic
analog switch
integrated circuit
magnetic 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
Application number
JP20642784A
Other languages
Japanese (ja)
Inventor
Shigeaki Watanabe
渡辺 薫明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toko Inc
Original Assignee
Toko Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toko Inc filed Critical Toko Inc
Priority to JP20642784A priority Critical patent/JPS6185613A/en
Publication of JPS6185613A publication Critical patent/JPS6185613A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/49Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969Details for track selection or addressing

Abstract

PURPOSE:To shorten the access time by arranging thin film magnetic heads, whose number is equal to the number of recording tracks, in a line on an insulting substrate and providing an analog switch integrated circuit having switches required for selective switching of individual thin film magnetic heads. CONSTITUTION:A multitrack thin film magnetic head assembly 1 where plural thin film magnetic heads 3 and an analog switch integrated circuit 4 are provided on an insulating substrate 2 is fixed to and arranged on the radius of a disc 8 so that heads 3 face the recording face of the disc 8. Heads 3 access a designated recording address in accordance with the electric selecting operation for objective magnetic heads due to the operation of the analog switch integrated circuit 4, which is provided switches required for selective switching of individual thin film magnetic heads 3, and the rotating operation of the magnetic disc 8. By this constitution, the access time is shortened considerably in comparison with a mechanical access mechanism.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は多トラック薄膜磁気へ一/ トに関し、例えば
磁気ディスク装置などの固定ヘッドとして有効に利用す
ることができる。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a multi-track thin film magnetic head and can be effectively used as a fixed head of a magnetic disk device, for example.

[従来技術の説明J 従来の磁気ディスク装置は、周知のように、磁気ディス
クの一面当りに1つの磁気ヘッドを備えており、機械的
なアクセス機構によって磁気ヘッドをディスクの半径方
向に移動可能に4Ii成している。指定記録番地へのア
クセスは、磁気ヘッドの対応トラックへの移動動作と磁
気ディスクの回転動作とによって行なわれる。
[Description of Prior Art J As is well known, a conventional magnetic disk device is equipped with one magnetic head per side of a magnetic disk, and the magnetic head can be moved in the radial direction of the disk by a mechanical access mechanism. 4Ii has been completed. Access to a designated recording address is performed by moving the magnetic head to a corresponding track and rotating the magnetic disk.

このように磁気ヘッドのシーク動作が機械的なアクセス
機構によって行なわれるために、従来の磁気ディスク装
置においてはアクセス時間が遅いという問題があった。
Since the seek operation of the magnetic head is thus performed by a mechanical access mechanism, conventional magnetic disk drives have had the problem of slow access times.

[発明が解決しようとする問題点] 本発明は上記従来技術の問題点を改善するもので、その
目的は、磁気ディスク装置のアクセス時間を短縮するこ
とのできる磁気ヘッドアセンブリを提供することにある
[Problems to be Solved by the Invention] The present invention is intended to improve the above-mentioned problems of the prior art, and its purpose is to provide a magnetic head assembly that can shorten the access time of a magnetic disk device. .

本発明の別の目的は、機械的なアクセス機構を不要とす
る磁気ヘッドアセンブリを提供することにある。
Another object of the present invention is to provide a magnetic head assembly that does not require a mechanical access mechanism.

本発明の更に別の目的は、多トラックヘッドにおいて各
磁気ヘッドの選択切換機能を備えた多トラック薄11Q
 ai気ヘッドアセンブリを提供することにある。
Still another object of the present invention is to provide a multi-track thin 11Q multi-track head with a selection switching function for each magnetic head.
The purpose of the present invention is to provide an AI head assembly.

[問題点を解決するための手段] 本発明においては、単一の絶縁性基板の上に記録トラン
クに対応する数の薄膜磁気ヘッドを一列配置し、更にそ
の同一基板上に、薄膜磁気ヘッドの選択vJ換を行ない
選択された磁気ヘッドの信号を出力し又は外部からの信
号を与えるアナログスイッチ集積回路をもうけた多トラ
ック薄膜磁気ヘッドアセンブリによって、上記目的を達
成する。
[Means for Solving the Problems] In the present invention, thin film magnetic heads, the number of which corresponds to the number of recording trunks, are arranged in a row on a single insulating substrate, and furthermore, a number of thin film magnetic heads are arranged on the same substrate. The above object is achieved by a multi-track thin film magnetic head assembly having an analog switch integrated circuit that performs selective VJ conversion and outputs a selected magnetic head signal or provides an external signal.

[発明の実施例] 第1図および第2図は本発明による多トラック薄膜磁気
ヘッドアセンブリの一実施例を示す構成図で、第1図は
平面図、第2図は側断面図である。
[Embodiment of the Invention] FIGS. 1 and 2 are block diagrams showing an embodiment of a multi-track thin film magnetic head assembly according to the present invention, with FIG. 1 being a plan view and FIG. 2 being a side sectional view.

多トラック薄膜磁気ヘッドアセンブリlは、セラミック
あるいはシリコンなどの絶縁性の基板2の上に、複数の
薄膜磁気ヘッド3とアナログスイッチ集積回路4を備え
ている。
A multi-track thin film magnetic head assembly 1 includes a plurality of thin film magnetic heads 3 and an analog switch integrated circuit 4 on an insulating substrate 2 made of ceramic or silicon.

本実施例では基板2は矩形状で、その一端面laに沿っ
て薄膜磁気ヘッド3が配列される。薄膜磁気ヘッド3は
、基板2に薄膜技術により形成され、そのヘッドギャッ
プ3aが基板2の端面laと同一面を形成するように配
列された直線状の一列配置で、記録トラック数に対応す
る個数もうけられる。
In this embodiment, the substrate 2 has a rectangular shape, and the thin film magnetic heads 3 are arranged along one end surface la of the substrate 2. The thin film magnetic heads 3 are formed on the substrate 2 by thin film technology, and are arranged in a straight line so that the head gap 3a forms the same surface as the end surface la of the substrate 2, and the number of the thin film magnetic heads 3 corresponds to the number of recording tracks. You can make money.

アナログスイッチ集積回路4は、各薄膜磁気ヘッド3を
切換選択しうるに足るスイッチ群を有しており、第2図
に示すように基板2の上にもうけられる。
The analog switch integrated circuit 4 has a group of switches sufficient to switch and select each thin film magnetic head 3, and is provided on the substrate 2 as shown in FIG.

各ヘッド3とアナログスイッチ4の間の電気的接続なら
びにアナログスイッチ4の信号線は、基板2の上に形成
された導体パターン5a、5b、5cによってなされる
。導体パターン5aはアナログスイッチ4と各ヘッド3
とを接続するもので、接続回路については後述する。導
体パターン5bはアナログスイッチ3の入出力信号線で
、本例では2本でありデータをシリアルに入出力するよ
うに構成されている。導体パターン5cはヘッド選択信
号線で、いずれのヘッドを選択するかの外部信号が入力
される。
Electrical connections between each head 3 and analog switch 4 as well as signal lines of analog switch 4 are made by conductor patterns 5a, 5b, and 5c formed on substrate 2. The conductor pattern 5a connects the analog switch 4 and each head 3.
The connection circuit will be described later. The conductor pattern 5b is an input/output signal line of the analog switch 3, and in this example, there are two conductor patterns 5b configured to serially input/output data. The conductor pattern 5c is a head selection signal line, into which an external signal indicating which head is to be selected is input.

以上のa戊の多トラック薄llff1磁気ヘッドアセン
ブリlは、第2図に示すように、アナログスイッチ集積
回路4にカバー6を施して樹脂モールド7で覆われる。
As shown in FIG. 2, the above-described multi-track thin llff1 magnetic head assembly 1 is provided with a cover 6 on the analog switch integrated circuit 4 and covered with a resin mold 7.

このようなヘッドアセンブリlは、磁気ディスク8に対
して第1図に示すように配置される。磁気ディスク8は
軸8aを中心として回転可能である。ヘッドアセンブリ
1は、そのヘッド3がディスク8の記録面に対向するよ
うにディスク8の径」二に固定配置される。指定記録番
地へのアクセスは、本体装置からのヘッド選択信号に応
じたアナログスイッチ4の動作による目的磁気ヘッドの
電気的な選定動作、および磁気ディスク8の回転動作に
よって行なわれる。
Such a head assembly l is arranged with respect to the magnetic disk 8 as shown in FIG. The magnetic disk 8 is rotatable around an axis 8a. The head assembly 1 is fixedly arranged on the diameter 2 of the disk 8 so that the head 3 faces the recording surface of the disk 8. Access to the designated recording address is performed by electrically selecting the target magnetic head by operating the analog switch 4 in response to a head selection signal from the main unit, and by rotating the magnetic disk 8.

/、l:お、基板2をシリコンにすれば、アナログスイ
ッチ集積回路を基板2に形成することが可能となる。
/, l: Oh, if the substrate 2 is made of silicon, it becomes possible to form an analog switch integrated circuit on the substrate 2.

第3図は本発明によるヘッドアセンブリに好適な薄膜磁
気ヘッドの一構成例を示す平面図で、その特徴は、ヘッ
ドコア形成用の磁性薄膜10を複数回の折り返しによっ
て平面的に広げた波形形状のパターンとし、その波形部
分に導体薄膜パターン11を巻回形成する構造で、これ
により、磁性ti膜パターン10に対する導体薄膜パタ
ーン11のターン数を増大することなく、電磁変換効率
を向上させている点にある。従って、このヘッドによれ
ば、電磁変換効率がコイルの巻回数に支配されないため
、トラックピッチに良く適合するものを簡単に得ること
ができる。
FIG. 3 is a plan view showing an example of the configuration of a thin film magnetic head suitable for the head assembly according to the present invention.The feature is that the magnetic thin film 10 for forming the head core is expanded in a plane by folding the magnetic thin film 10 a plurality of times. It has a structure in which the conductor thin film pattern 11 is wound around the waveform portion of the pattern, thereby improving the electromagnetic conversion efficiency without increasing the number of turns of the conductor thin film pattern 11 relative to the magnetic Ti film pattern 10. It is in. Therefore, according to this head, since the electromagnetic conversion efficiency is not controlled by the number of turns of the coil, it is possible to easily obtain a head that matches the track pitch well.

第3図において、薄膜パターン10および11は第1図
の基板2の上に形成される。
In FIG. 3, thin film patterns 10 and 11 are formed on substrate 2 of FIG.

磁性薄膜パターンlOは、基板の上に平面状に広がる矩
形波形状で、3つの折り返し部分(10A、IOB、l
0C)を有し、6つのコアセグメント (10−1,1
0−2,10−3,10−4、10−5、l 0−6)
を備えている。これらセグメントのうちの10−3と1
0−6は夫々セグメント10−2と10−5の背面に位
置しているので、破線で図示されている。セグメント1
0−1は、その一端がヘットキャブ12に延びて一方の
磁極を形成し、他端が折り返し部分10Aでセグメント
10−2およびその背面のセグメン)10−3に分岐し
て結合している。セグメント1o−2とlO〜3は次の
折り返し部分10Bで一体となり、次のセグメン)10
−4につながっている。セグメント10−4は最終の折
り返し部分10Cでセグメント10−5およびそのff
面のセグメント10−6に分岐して結合している0分岐
しているセグメント10−5とlo−6はへウドギャプ
12の手前近傍で一体となり、ヘットキャブ12に延び
てセグメン)10−1(7)一端と対向する他方の磁極
を形成している。
The magnetic thin film pattern IO has a rectangular wave shape that spreads flat on the substrate, and has three folded parts (10A, IOB, IO).
0C) and six core segments (10-1,1
0-2, 10-3, 10-4, 10-5, l 0-6)
It is equipped with 10-3 and 1 of these segments
0-6 are shown in dashed lines because they are located on the back side of segments 10-2 and 10-5, respectively. segment 1
0-1 has one end extending to the head cab 12 to form one magnetic pole, and the other end branching off and connecting to the segment 10-2 and the segment 10-3 on the back thereof at the folded portion 10A. Segments 1o-2 and 1O~3 are integrated at the next folded part 10B, and the next segment) 10
-4 is connected. Segment 10-4 is the final folded portion 10C, and segment 10-5 and its ff
The 0-branched segments 10-5 and lo-6, which are branched and connected to the surface segment 10-6, are integrated near the front of the head gap 12, and extend to the head cab 12 to form the segment 10-1 (7). ) forming the other magnetic pole opposite to one end.

導体薄膜パターン11は8つの導体セグメント(11−
1,11−2,11−3,11−4゜11−5.11−
6.11−7.If−8)を有している。これらのうち
のセグメント(11−2,11−4,11−6,1l−
8)は各セグメン)   (11−1,11−3,11
−5,1l−7)の背面に夫々位置しており、破線で図
示されている。各導体セグメントは、磁性薄膜パターン
10のコアセグメントに直交するように位置しており、
磁性薄膜パターン10に同一方向の磁束が生ずるように
巻回配列されている。導体セグメントti−tは、コア
セグメント10−1の」二→コアーt=グ、+lント1
0−2と10−3の間→コアセグメントI O−4の上
→コアセグメント10−5と10−6の間を順次通過し
て、その背面の導体セグメント11−2に電気的に接続
されている。ずν面の導体セグメント11−2は、コア
セグメント10−5と1O−6の間→コアセグメント1
0−4の下→コアセグメント10−2!−10−317
)u→コ7セグメン)10−1の下を順次通過して、次
の表面の導体セグメン)11−3に電気的に接続される
。他の表面の導体セグメントは各コアセグメントに対し
て上述の導体セグメント11−1と同様のa成を有して
おり、他の背面の導体セグメントは上述の導体セグメン
トエ1−2と同様である。
The conductor thin film pattern 11 has eight conductor segments (11-
1,11-2,11-3,11-4゜11-5.11-
6.11-7. If-8). Among these segments (11-2, 11-4, 11-6, 1l-
8) is each segment) (11-1, 11-3, 11
-5 and 1l-7), respectively, and are illustrated by broken lines. Each conductor segment is located perpendicular to the core segment of the magnetic thin film pattern 10,
The magnetic thin film pattern 10 is wound in a winding arrangement so that magnetic flux is generated in the same direction. The conductor segment ti-t is the same as that of the core segment 10-1.
0-2 and 10-3→core segment I O-4→passes between core segments 10-5 and 10-6 in order and is electrically connected to the conductor segment 11-2 on the back side thereof. ing. The conductor segment 11-2 on the ν plane is between core segments 10-5 and 1O-6 → core segment 1
Below 0-4 → core segment 10-2! -10-317
) u → 7 segments) 10-1 and is electrically connected to the conductor segment) 11-3 on the next surface. The other surface conductor segments have a similar a configuration to each core segment as the conductor segment 11-1 described above, and the other back conductor segments have the same a configuration as the conductor segment 1-2 described above. .

t5411は各ヘッドとアナログスイッチとの接続回路
例を示すもので、4トラック対応のものを示している0
図から明らかなように、アナログスイッチ4は8つのス
イッチを有しており、2本の入出力線5bと4つのヘッ
ド3との間の接続を8つのスイッチを介して行なうよう
に構成されている。
t5411 shows an example of a connection circuit between each head and an analog switch, and 0 shows one that supports 4 tracks.
As is clear from the figure, the analog switch 4 has eight switches, and is configured to connect the two input/output lines 5b and the four heads 3 via the eight switches. There is.

第5図は各ヘッドとアナログスイッチの別の接続回路例
を示すもので、40トラック対応のものを示している。
FIG. 5 shows another example of a connection circuit between each head and an analog switch, and shows one that supports 40 tracks.

ヘッド3の数は40、アナログスイッチは40個のスイ
ッチを有している。各ヘッド3の一方の端子はコモンと
なっており、ひとつのスイッチを閉じることでひとつの
ヘッドが選択できるように構成されている。
The number of heads 3 is 40, and the analog switch has 40 switches. One terminal of each head 3 is a common terminal, and the structure is such that one head can be selected by closing one switch.

第6図は各ヘッドとアナログスイッチの更に別の接続回
路例を示すもので、64トラック対応の8ビツトパラレ
ル入出力構成のものを示す、ヘッドおよびアナログスイ
ッチは8つのブロックA〜Hに分けられる。各ブロック
A−Hには8個のヘッド3と8個のスイッチがあり、各
ブロックがら信号入出力!15b−1〜5b−8が夫々
引き出される。従って、8ビツトパラレルの読み書きが
可能である。
Figure 6 shows yet another example of a connection circuit between each head and analog switch, showing an 8-bit parallel input/output configuration that supports 64 tracks.The heads and analog switches are divided into eight blocks A to H. . Each block A-H has 8 heads 3 and 8 switches, and each block can input and output signals! 15b-1 to 5b-8 are each pulled out. Therefore, 8-bit parallel reading and writing is possible.

[発明の効果] 以上説明したように本発明によれば、絶縁性の基板に、
−列配置で形成された記録トラック数と同数の薄g磁気
ヘッドと共に、各am磁気ヘッドの選択!/]換に必要
な数のスイッチを有するアナログスイッチ集積回路をも
うけることとしたので、電気的な選択動作によって磁気
ヘッドのシーク動作を行なうことができ、従来の機械的
なアクセス機構の場合に比べて極めて短い時間で行なう
ことが可能となる。従って、本発明を磁気ディスク装置
に適用すれば、アクセス時間の高速化を図ることができ
るばかりでなく、ヘッドのアクセス機構が不要となるな
どの大きな利点がある。
[Effects of the Invention] As explained above, according to the present invention, an insulating substrate,
- Selection of each am magnetic head with the same number of thin g magnetic heads as the number of recording tracks formed in a column arrangement! /] Instead, we created an analog switch integrated circuit with the necessary number of switches, so the seek operation of the magnetic head can be performed by electrical selection operation, which is faster than the conventional mechanical access mechanism. This can be done in an extremely short time. Therefore, if the present invention is applied to a magnetic disk device, there are great advantages such as not only the access time can be increased, but also a head access mechanism becomes unnecessary.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明による多トラック薄膜磁気ヘッドアセン
ブリの一実施例を示すf面構成図、第2図は第1図の側
面断面図、第3図は本発明に好適な薄膜磁気ヘッドの一
例を示す構成図、第4図。 第5図およびfjSB図は各薄II2磁気ヘッドとアナ
ログスイッチ″集積回路の接続例を示す回路図である。 1:多トラック薄膜磁気ヘッドアセンブリ2:基板 3:薄膜磁気ヘッド 4:アナログスイッチ集積回路
FIG. 1 is an f-plane configuration diagram showing an embodiment of a multi-track thin film magnetic head assembly according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is an example of a thin film magnetic head suitable for the present invention. A configuration diagram showing FIG. 4. 5 and fjSB are circuit diagrams showing examples of connections between each thin II2 magnetic head and an analog switch integrated circuit. 1: Multi-track thin film magnetic head assembly 2: Substrate 3: Thin film magnetic head 4: Analog switch integrated circuit

Claims (1)

【特許請求の範囲】[Claims] 絶縁性の基板と、各ヘッド先端が前記基板の一端面に沿
って一列配置されるように前記基板の上に配列された記
録トラック数と同数の薄膜磁気ヘッドと、前記基板にも
うけられ各薄膜磁気ヘッドの選択切換に必要な数のスイ
ッチ群を有するアナログスイッチ集積回路と、各薄膜磁
気ヘッドと前記アナログスイッチ集積回路間の電気的接
続線および前記アナログスイッチ集積回路の信号線を形
成する導体パターンとを有することを特徴とする多トラ
ック薄膜磁気ヘッドアセンブリ。
an insulating substrate, thin film magnetic heads of the same number as the number of recording tracks arranged on the substrate so that each head tip is arranged in a line along one end surface of the substrate, and each thin film magnetic head formed on the substrate. An analog switch integrated circuit having a number of switch groups necessary for selecting and switching magnetic heads, and a conductor pattern forming electrical connection lines between each thin film magnetic head and the analog switch integrated circuit and signal lines of the analog switch integrated circuit. A multi-track thin film magnetic head assembly comprising:
JP20642784A 1984-10-03 1984-10-03 Multitrack thin film magnetic head assembly Pending JPS6185613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20642784A JPS6185613A (en) 1984-10-03 1984-10-03 Multitrack thin film magnetic head assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20642784A JPS6185613A (en) 1984-10-03 1984-10-03 Multitrack thin film magnetic head assembly

Publications (1)

Publication Number Publication Date
JPS6185613A true JPS6185613A (en) 1986-05-01

Family

ID=16523195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20642784A Pending JPS6185613A (en) 1984-10-03 1984-10-03 Multitrack thin film magnetic head assembly

Country Status (1)

Country Link
JP (1) JPS6185613A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002077981A1 (en) * 2001-03-23 2002-10-03 Alessio Gerotto Electronic ic device with multiple fixed heads for reading and writing data from/on magnetic media forming digital computer mass stores
JP2006348662A (en) * 2005-06-17 2006-12-28 Cleanup Corp Wall-behind piping structure of system bathroom
JP2009193624A (en) * 2008-02-13 2009-08-27 Tdk Corp Method and apparatus for inspecting characteristic of thin film magnetic head element
JP2009193653A (en) * 2008-02-18 2009-08-27 Tdk Corp Method and apparatus for inspecting characteristic of thin film magnetic head element
JP2009211760A (en) * 2008-03-04 2009-09-17 Tdk Corp Characteristic inspection method and device for thin film magnetic head element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4968716A (en) * 1972-10-31 1974-07-03
JPS5022611A (en) * 1973-06-27 1975-03-11

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4968716A (en) * 1972-10-31 1974-07-03
JPS5022611A (en) * 1973-06-27 1975-03-11

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002077981A1 (en) * 2001-03-23 2002-10-03 Alessio Gerotto Electronic ic device with multiple fixed heads for reading and writing data from/on magnetic media forming digital computer mass stores
JP2006348662A (en) * 2005-06-17 2006-12-28 Cleanup Corp Wall-behind piping structure of system bathroom
JP2009193624A (en) * 2008-02-13 2009-08-27 Tdk Corp Method and apparatus for inspecting characteristic of thin film magnetic head element
JP2009193653A (en) * 2008-02-18 2009-08-27 Tdk Corp Method and apparatus for inspecting characteristic of thin film magnetic head element
JP2009211760A (en) * 2008-03-04 2009-09-17 Tdk Corp Characteristic inspection method and device for thin film magnetic head element

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