JPS61120382A - Positioning method of specific track sensor of floppy disk driving device - Google Patents

Positioning method of specific track sensor of floppy disk driving device

Info

Publication number
JPS61120382A
JPS61120382A JP24081484A JP24081484A JPS61120382A JP S61120382 A JPS61120382 A JP S61120382A JP 24081484 A JP24081484 A JP 24081484A JP 24081484 A JP24081484 A JP 24081484A JP S61120382 A JPS61120382 A JP S61120382A
Authority
JP
Japan
Prior art keywords
sensor
light
magnetic head
track
shielding plate
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
JP24081484A
Other languages
Japanese (ja)
Inventor
Shinichi Tanaka
真一 田中
Fumihiko Nakazawa
文彦 中沢
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP24081484A priority Critical patent/JPS61120382A/en
Publication of JPS61120382A publication Critical patent/JPS61120382A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/10—Indicating arrangements; Warning arrangements
    • 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

Abstract

PURPOSE:To position a sensor for detection through simple button operation accurately corresponding to the outermost peripheral track of a standard disk medium by detecting whether a light shield plate fitted to a carrier which carries a magnetic head cuts off the light of the sensor or not. CONSTITUTION:When the sensor 1 is positioned, a button TR00 on the panel of a sensor positioning adjustment device 40 is pushed and then a track number 34 is counted down in a CPU to move a magnetic head 3 onto a track TR0. The sensor 1 is not positioned accurately corresponding to the position of the track TR0 unless a light emitting diode 47 is not off, so the sensor 1 is moved manually unit the light emitting diode 47 turns off. Then, the position of the sensor 1 is adjusted finely. Namely, a one-step button 47 on the panel is pushed to move the magnetic head 3 by two tracks inward on a magnetic disk 4. When the light emitting diode 44 on the panel illuminates, the sensor 1 is positioned accurately corresponding to the track TR0.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はマイクロクロ、ピディスク機構部の調整方法に
係り、特に、磁気ヘッドの基準位置の決定に用いられる
特定トラックセンサの位置決め方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for adjusting a micro-crop and pidisk mechanism, and more particularly to a method for positioning a specific track sensor used to determine the reference position of a magnetic head.

〔従来の技術〕[Conventional technology]

一般に、７０ツピデイスク駆動装置を用いて磁気ディス
ク媒体からの情報の読出し又は媒体への情報の書込みを
行う場合、磁気ヘッドの基準位置を確定する必要がある
。このために、所定のトラックに所定のパターンが書込
まれた基準ディスクが用いられ、オな、革命ディスクの
最外周トラック上（（磁気ヘッドが存在するときの磁気
ヘッドの位置を検出する特定トラックセンサ（以下単に
センサと称する）が用いられている。Generally, when reading information from or writing information to a magnetic disk medium using a 70 disk drive device, it is necessary to determine the reference position of the magnetic head. For this purpose, a reference disk on which a predetermined pattern is written on a predetermined track is used, and a specific track (a specific track for detecting the position of the magnetic head when a magnetic head is present) is used on the outermost track of the revolutionary disk. A sensor (hereinafter simply referred to as sensor) is used.

〔発明≠；解決すべき問題点〕[Invention≠; Problem to be solved]

従来に磁気ヘッドを上記所定トラック上に移動させるシ
ーク操作及び上記センサの位置決め操作が複雑であると
いう問題点があつ念。Conventionally, there has been a problem in that the seek operation for moving the magnetic head onto the predetermined track and the positioning operation for the sensor are complicated.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するために１本発明によ、り提供てれ
る方法は、 ７０、ビディスク駆動装置において、 中　標準ディスク媒体の最外周トラック上に磁気ヘッド
を移動させ、 ｌｐ　　磁気ヘッドを担持するキャリアに取付けられ九
光遮蔽板が、発光素子と受光素子からなるセンサの光を
１蔽しているか否かを検出し、１ｉ）　　ｉｌ蔽してい
ない場合は光遮蔽板がセンサの光を痔翳する迄センサを
該磁気ヘッドの移動方向に移動し。In order to solve the above problems, one method provided by the present invention is as follows: 70. In a bi-disk drive device, move the magnetic head onto the outermost track of the medium standard disk medium, and carry the lp magnetic head. Detects whether the light shielding plate attached to the carrier is blocking the light of the sensor consisting of a light emitting element and a light receiving element, and if it is not blocking the light of the sensor, the light shielding plate blocks the light of the sensor. The sensor is moved in the moving direction of the magnetic head until the hemorrhoid is removed.

４ψ　磁気ヘッドを標準ディスクの半径方向内側に２）
ラック分移動シせ念後、光遮蔽板がセンサの光ｆ：攬ｅ
しているか否かを検出し、Ｍ　依然として光遮蔽板がセ
ンサの光を遮蔽している場合は光晴腋板がセンサの光を
鴻蔽しなくなる迄センサを磁気ヘッドの移動方向に移動
した後、上記（ｉ）から（ｉψのステップを繰り返し、
上記（ｉψのステップで光遮蔽板がセンサの光ｔ−遮蔽
していないことが検出されたときのセンサの位置を任意
のディスク媒体の最外周トラックの位置とするようにす
ることを特徴とする７０ツビデイスク駆動装置釦おける
特嚢トラックセンサの位置決め方法である。4ψ Magnetic head placed inside the standard disk in the radial direction 2)
After moving the rack, the light shielding plate detects the sensor's light f:
If the light shielding plate still blocks the sensor light, move the sensor in the direction of movement of the magnetic head until the light shielding plate no longer blocks the sensor light. Repeat steps (i) to (iψ) above,
It is characterized in that the position of the sensor when it is detected in the step (iψ) that the light shielding plate does not shield the light t of the sensor is the position of the outermost track of an arbitrary disk medium. This is a method for positioning a special bag track sensor in a 70 disc drive button.

〔実′ｍ例〕[Actual example]

第１図は本発明の一実施例を説明するための７０−デヤ
ート、第２図は本発明の一実施例に係るフロッピディス
ク駆動装置の概略平面図、第３図は第２図の■−■線側
面図、第４図はセンサ位置決め調整器の１　［ＦＩＪを
示す斜視図である。FIG. 1 is a 70-day diagram for explaining an embodiment of the present invention, FIG. 2 is a schematic plan view of a floppy disk drive according to an embodiment of the present invention, and FIG. 3 is a diagram of FIG. Figure 4 is a perspective view showing 1 [FIJ] of the sensor positioning adjuster.

第１図において、ステップＳ１でＣＰＵ内プロ。In FIG. 1, in step S1, the CPU internal processor is activated.

ダラムによりフロッピディスク駆動装置ｉｉＦ　Ｄ　Ｄ
内部のセンサ１．ステ、プモータ２１！２図）、ＤＣモ
ータ（図示せず）等の機能がチェックされ、ステップＳ
２にてこれらのいずれかに異常ありと判別されると、ス
テップＳ３にてセンサ位置決め調整器４０のパネル上の
発光ダイオード４１．４２が点灯し、オペレータに異常
を知らせる。Floppy disk drive iiF D D by Durham
Internal sensor 1. The functions of the step S, motor 21!2), DC motor (not shown), etc. are checked, and the
If it is determined in Step 2 that there is an abnormality in any of these, the light emitting diodes 41 and 42 on the panel of the sensor positioning regulator 40 are turned on in Step S3 to notify the operator of the abnormality.

ステップＳ２で異常なしと判別されると、ステップＳ４
及びＳ５にて磁気ヘッド３の標準ディスク媒体４（第２
図）に対するアラインメント調整が行われる。すなわち
、ステップＳ４にてセンサ位を決め調整器４０上のアラ
インメントボタン４３を押し、それにより磁気ヘッド３
と標準ディスク媒体４上のトラックＴＲ２０の近傍にシ
ーク嘔せる。トラックＴＲ２０にはギヤッツアイ波形等
のアラインメントデータが書込まれている。この時は、
最外周トラックＴＲ０Ｏに対応するようにセンサ１が正
確に位置付けされていないので、トラック数を２０だけ
カウントしても磁気ヘッド３は必ずしもトラックＴＲ２
０上に正確には位置付けされず、トラックＴＲ２０の前
後にイニシャライズされることが多い。そこで、ステッ
プＳ５にて、トラックＴＲ２０に省込まｈているキャッ
ツアイ波形が最大となるようにステップモータ２を動か
して、磁気ヘッド３がトラックＴＲ２０上に正確に位置
決めされる。キヤ、ツアイ波形は、センサ位置決め調整
器４０（第４図）のパネル上に設けられたシンクロスコ
ープ用端子４４からの信号をシンクロスコープ（図示せ
ず）に視覚化しこれ？観測することによｔ）調整する。If it is determined in step S2 that there is no abnormality, step S4
And in S5, the standard disk medium 4 (second
Alignment adjustment is performed for (Fig.). That is, in step S4, the sensor position is determined and the alignment button 43 on the adjuster 40 is pressed, thereby aligning the magnetic head 3.
Then, a seek is performed near the track TR20 on the standard disk medium 4. Alignment data such as a gear's eye waveform is written in the track TR20. At this time,
Since the sensor 1 is not positioned accurately to correspond to the outermost track TR0O, the magnetic head 3 does not necessarily correspond to the track TR2 even if the number of tracks is counted as 20.
0, and is often initialized before or after track TR20. Therefore, in step S5, the step motor 2 is moved so that the cat's eye waveform recorded on the track TR20 is maximized, and the magnetic head 3 is accurately positioned on the track TR20. The signal from the synchroscope terminal 44 provided on the panel of the sensor positioning adjuster 40 (FIG. 4) is visualized on a synchroscope (not shown) to obtain the clear and true waveforms. t) Adjust by observing.

次いで、ステップＳ６及びＳ７にて、磁気ヘッドのアジ
マス角の調整を行う、すなわち、ステップＳ６にてセン
サ位置決め調整器４０（＠４図）のパネル上のアジマス
ボタン４５を押スト、ＣＰＵはトラックＴＲ２０を中心
にカウントアツプし、アジマスデータが書込まれている
トラックＴＲ３４に磁気ヘッドを移動させる。そしてス
テ、プＳ７ニテシンクロスコープにてアジマス波形を［
１ｌＪＩ＋し。Next, in steps S6 and S7, the azimuth angle of the magnetic head is adjusted. That is, in step S6, the azimuth button 45 on the panel of the sensor positioning adjuster 40 (@Figure 4) is pressed, and the CPU adjusts the azimuth angle of the magnetic head. The magnetic head is counted up centering on , and the magnetic head is moved to the track TR34 where the azimuth data is written. Then, check the azimuth waveform with the step S7 unit synchroscope [
1l JI+.

アジマス角の調整とする。Adjust the azimuth angle.

こうして、磁気ヘッド３は標準ディスク４に対してトラ
ック位置及びトラ、夕方向共に正確に位置決めでれる。In this way, the magnetic head 3 can be accurately positioned with respect to the standard disk 4 in both the track position, track position, and direction.

次イで、ステップ８８からｓ＋４　　にて、センサ１の
位置決めが行わねるａオす、ステップｓ８にてセンサ位
置決め調整器ａＯ（第４図）のパネル上のＴＲ０Ｏボタ
ン４６を押すとｔステップｓ９にてＣＰＵ内部でトラッ
ク数３４をカウントダウンし、トラックＴＲＯ上に磁気
ヘッド３を移動させる。次いでステ、プＳＩＣ＋にてパ
ネル上の発光ダイオード４７が消灯しているか否かを判
別する。Next, in steps 88 to s+4, the sensor 1 cannot be positioned. In step s8, press the TR0O button 46 on the panel of the sensor positioning regulator aO (Fig. 4), and go to step s9. Then, the number of tracks 34 is counted down inside the CPU, and the magnetic head 3 is moved onto the track TRO. Next, step SIC+ determines whether the light emitting diode 47 on the panel is off.

発光ダイオード４７け、本実施例では、磁気ヘッド３を
担持するキャリ、ジ３１の所定位置に取付けられ虎光澗
蔽板３２が光センサ１の光を肩板したときに消灯し、淵
蔽しないときに点灯するように設計されている夷のとす
る。すなわち、９４３図に示すように、センサ１け発光
素子１１と受光素子１２を対向させて構成されており、
図示の如くその間に光濾蔽板３２が存在しないときは、
受光素子には発光素子１１からの光を受光し、それによ
りパネル上の発光ダイオード４７け点灯するが、発光素
子１１と受光素子１２の間に光譚蔽板３２が来ると受光
素子１２は発光素子１１からの光を受光でをず、それて
よ２つパネル上の発光ダイｆ−）’４７が消灯するよう
になっている。In this embodiment, the light emitting diode 47 is attached to a predetermined position of the carrier 31 carrying the magnetic head 3, and turns off when the light shielding plate 32 intercepts the light from the optical sensor 1, and does not block the light. When the light is designed to be lit. That is, as shown in FIG.
When there is no light filtering plate 32 in between as shown in the figure,
The light-receiving element receives light from the light-emitting element 11, which lights up the light-emitting diode 47 on the panel, but when the light shielding plate 32 comes between the light-emitting element 11 and the light-receiving element 12, the light-receiving element 12 stops emitting light. When the light from the element 11 is received, the two light emitting dies f-)'47 on the panel are turned off.

ステップｓ＋ｑ　　にて発光ダイオード４７が消灯して
いないと判別されたときは、センサ１の位置がトラック
ＴＲＯの位置に正確に対応づけて位置付けされていない
ので、ステップＳ１１　　にて発光ダイオード４７が消
灯するまでセンサ１ｆ：手動で移動する。If it is determined in step s+q that the light emitting diode 47 is not turned off, the position of the sensor 1 is not positioned in accurate correspondence with the position of the truck TRO, so the light emitting diode 47 is turned off in step S11. Up to sensor 1f: Move manually.

センサ１は、！４２図及び第３図に示すように、磁気ヘ
ッド３の可動方向と同一方向に移動可能なように設けら
れた穴１３．１４にポル）１５．１６を通し、ナツト１
７．１８で締めつけて固定される。Sensor 1 is! As shown in FIG. 42 and FIG.
7. Tighten and fix with 18.

ステップＳ１０又はＳ１１　　の後、センサ１の位置の
微調整を行う、すなわち、ステップ８１２にてパネル上
の１ステツプボタン４７を押して、磁気ヘッド３を磁気
ディスク４の内側に２トラツクだけ移動すせる。ステッ
プモータ２は４相の励磁相を有しており、２相の励磁九
より磁気ヘッド３Ｆｉ１　トラック分移動するので、２
トラツクの１％け４相の励磁により行われる。従って、
２トラツクの移動の前後における励磁相は同一である。After step S10 or S11, the position of the sensor 1 is finely adjusted. That is, in step 812, the 1-step button 47 on the panel is pressed to move the magnetic head 3 two tracks inside the magnetic disk 4. The step motor 2 has four excitation phases, and the magnetic head 3Fi1 track is moved from the two-phase excitation nine.
This is done by 4-phase excitation for 1% of the track. Therefore,
The excitation phases before and after the two-track movement are the same.

次いで、ステ、プ８１３　　にて・くネル上の発光ダイ
オード４４が点灯しているか否かを判別する。Next, in step 813, it is determined whether the light emitting diode 44 on the tunnel is lit.

点灯していれば、センサ１の位置は正確にトラックＴＲ
Ｏに対応して位置づけられていることになり、位置決め
処理は終了する。If it is lit, sensor 1 is located correctly on track TR.
This means that it is positioned corresponding to O, and the positioning process ends.

依然として発光ダイオード４７が消灯していれば、セン
サ１０位置は正確ではないので、ステップ８１４にて発
光ダイオード４７が点灯する迄センサ１を手動で移動す
る。ステップＳ＋４　　の後は、ステップＳａｄ降の動
作を操？）返す。If the light emitting diode 47 is still off, the sensor 10 position is not accurate, and in step 814 the sensor 1 is manually moved until the light emitting diode 47 is on. After step S+4, do you want to control the descending action of step Sad? )return.

こうして、センサ１が標準ディスク媒体の１役外周トラ
ックに正確に対応づけて位置決めされた後は、任意のデ
ィスク媒体のトラックＴＲＯの位置がセンサ１により容
易に検出さ力る。In this way, after the sensor 1 is positioned in accurate correspondence with one of the outer peripheral tracks of the standard disk medium, the position of the track TRO of any disk medium can be easily detected by the sensor 1.

以上の実′梅列ではパネル上の発光ダイオード４７は光
センサ１の光が７云蔽されているときに発光するものと
して説明したが、この逆に、光センサ１の光が＠蔽され
ていないときに発光するようにしてもよいことは勿論で
ある。In the above actual series, the light emitting diode 47 on the panel was explained as emitting light when the light from the optical sensor 1 is blocked, but conversely, when the light from the optical sensor 1 is blocked Of course, it is also possible to emit light when there is no light.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように、本発明によれば標準デ
ィスク媒体の最外周トラックに正確に対応して最外周ト
ラック検出用センサを位置決めすることが、簡単なボタ
ン操作で実現できる。As is clear from the above description, according to the present invention, it is possible to position the outermost track detection sensor accurately in correspondence with the outermost track of a standard disk medium by a simple button operation.

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

第１図は本発明の一実施例を説明するなめのフローチャ
ート、第２図は本発明の一実施例に係る７０ツピデイス
ク駆動装置の概略平面図、第３図は第２図のｌＴｌ−１
線側面図、第４図はセンサ位置決め調整器の１例を示す
斜視図である。 １・・・センサ ２・・・ステップモータ ３・・・磁気ヘッド ４・・・標準ディスク媒体 １１・・・発光素子 １２・・・受光素子 １５．１６・・・ボルト ３１・・・キャリ、ジ ３２・・・光溝蔽板FIG. 1 is a flowchart explaining an embodiment of the present invention, FIG. 2 is a schematic plan view of a 70 disk drive device according to an embodiment of the present invention, and FIG. 3 is a lTl-1 shown in FIG. 2.
The line side view and FIG. 4 are perspective views showing one example of a sensor positioning adjuster. 1...Sensor 2...Step motor 3...Magnetic head 4...Standard disk medium 11...Light emitting element 12...Light receiving element 15.16...Volt 31...Carrier, jig 32...Light groove shielding plate

Claims (1)

【特許請求の範囲】 １、フロッピディスク駆動装置において、 （ｉ）標準ディスク媒体の最外周トラック上に磁気ヘッ
ドを移動させ、 （ｉｉ）該磁気ヘッドを担持するキャリアに取付けられ
た光遮蔽板が、発光素子と受光素子からなるセンサの光
を遮蔽しているか否かを検出し、（ｉｉｉ）遮蔽してい
ない場合は該光遮蔽板が該センサの光を遮蔽する迄該セ
ンサを該磁気ヘッドの移動方向に移動し、 （ｉｖ）該磁気ヘッドを該標準ディスクの半径方向内側
に２トラック分移動させた後、該光遮蔽板が該センサの
光を遮蔽しているか否かを検出し、（ｖ）依然として該
光遮蔽板が該センサの光を遮蔽している場合は該光遮蔽
板が該センサの光を遮蔽しなくなる迄該センサを該磁気
ヘッドの移動方向に移動した後、上記（ｉ）から（ｉｖ
）のステップを繰り返し、 上記（ｉｖ）のステップで該光遮蔽板が該センサの光を
遮蔽していないことが検出されたときの該センサの位置
を任意のディスク媒体の最外周トラックの位置とするよ
うにすることを特徴とするフロッピディスク駆動装置に
おける特定トラックセンサの位置決め方法。[Claims] 1. In a floppy disk drive device, (i) a magnetic head is moved onto the outermost track of a standard disk medium, and (ii) a light shielding plate attached to a carrier supporting the magnetic head is provided. , detects whether or not the light of the sensor consisting of a light emitting element and a light receiving element is shielded, and (iii) if it is not shielded, the sensor is moved to the magnetic head until the light shielding plate blocks the light of the sensor. (iv) after moving the magnetic head two tracks inward in the radial direction of the standard disk, detecting whether or not the light shielding plate is shielding the light from the sensor; (v) If the light shielding plate still blocks the light from the sensor, move the sensor in the direction of movement of the magnetic head until the light shielding plate no longer blocks the light from the sensor, and then move the sensor in the direction of movement of the magnetic head; i) to (iv
) is repeated, and the position of the sensor when it is detected in step (iv) above that the light shielding plate is not blocking the light from the sensor is determined as the position of the outermost track of any disk medium. 1. A method for positioning a specific track sensor in a floppy disk drive device.
JP24081484A 1984-11-16 1984-11-16 Positioning method of specific track sensor of floppy disk driving device Pending JPS61120382A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24081484A JPS61120382A (en) 1984-11-16 1984-11-16 Positioning method of specific track sensor of floppy disk driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24081484A JPS61120382A (en) 1984-11-16 1984-11-16 Positioning method of specific track sensor of floppy disk driving device

Publications (1)

Publication Number Publication Date
JPS61120382A true JPS61120382A (en) 1986-06-07

Family

ID=17065083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24081484A Pending JPS61120382A (en) 1984-11-16 1984-11-16 Positioning method of specific track sensor of floppy disk driving device

Country Status (1)

Country Link
JP (1) JPS61120382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5930221A (en) * 1995-08-07 1999-07-27 Fujitsu Limited Optical storage device made thinner by substituting electrical means for capabilities of sensors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5930221A (en) * 1995-08-07 1999-07-27 Fujitsu Limited Optical storage device made thinner by substituting electrical means for capabilities of sensors
US6292444B1 (en) 1995-08-07 2001-09-18 Fujitsu Limited Optical storage device made thinner by substituting electrical means for capabilities of sensors

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