JPS58102377A - Sector signal generator for magnetic disk - Google Patents
Sector signal generator for magnetic diskInfo
- Publication number
- JPS58102377A JPS58102377A JP20010981A JP20010981A JPS58102377A JP S58102377 A JPS58102377 A JP S58102377A JP 20010981 A JP20010981 A JP 20010981A JP 20010981 A JP20010981 A JP 20010981A JP S58102377 A JPS58102377 A JP S58102377A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- power generation
- winding
- rotor
- detector
- 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.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims abstract description 5
- 239000000696 magnetic material Substances 0.000 claims abstract description 5
- 238000010248 power generation Methods 0.000 claims description 35
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 239000011295 pitch Substances 0.000 description 7
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は駆動電動機に固定された固定式磁気デスクのセ
クター信号発生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sector signal generator for a fixed magnetic disk fixed to a drive motor.
本発明の磁気デスクのセクター信号発生装置は、磁気デ
スク駆動用電動機の回転子に取り付けた円周方向に等間
隔にN、Sを交互に着磁した速度検出用永久磁石と、該
永久磁石に空隙を介して対向配設した発電巻線と、上記
回転子に設けた1個の磁性体小片と、該小片に空隙を介
して対向配設した磁気検出器とより成り、上記発電巻線
は上記永久磁石の磁束と鎖交する複数の発電用導体を等
間隔に配設し、相隣接する発電用導体の一端同志及び他
端同志を交互に接続して連続した巻線としたことを特徴
とする。A sector signal generator for a magnetic desk according to the present invention includes a speed detection permanent magnet that is attached to the rotor of a magnetic desk drive motor and is magnetized with N and S magnets alternately at equal intervals in the circumferential direction, and The power generation winding consists of a power generation winding arranged opposite to each other with a gap in between, a small piece of magnetic material provided on the rotor, and a magnetic detector arranged opposite to the small piece with a gap in between. A plurality of power generation conductors interlinking with the magnetic flux of the permanent magnet are arranged at equal intervals, and one end and the other end of the adjacent power generation conductors are alternately connected to form a continuous winding. shall be.
以下図面によって本発明の詳細な説明する。The present invention will be explained in detail below with reference to the drawings.
第1図は従来のセクター信号発生装置を示し、1は磁気
デスク、2はその駆動用電動機、3は電動機軸5に直結
したセクター信号発生用スリツ、ト付円板、4は光源と
光電変換器とで構成したインターラブタ、6は基板、7
は磁気−\ラド、8は磁気ヘッド7を半径方向に駆動す
るための装置である。Fig. 1 shows a conventional sector signal generating device, where 1 is a magnetic disk, 2 is a driving electric motor, 3 is a sector signal generating slit directly connected to the motor shaft 5, a disc with a groove, and 4 is a light source and photoelectric conversion. 6 is a substrate, 7 is an interlayer consisting of a
8 is a device for driving the magnetic head 7 in the radial direction.
磁気デスク】は通常非磁性体の円板の表面に磁性体の微
粉末を塗布して形成され、駆動用電動機2の電動機軸5
に直結されており該電動機2により一定速度で回転され
るようになっている。磁気デスク1の磁性体塗布面には
磁気ヘッド7が極めて狭い空隙を介して配設され、該磁
気ヘッド7は半径方向駆動装置8で半径方向に一定のピ
ッチで制御されて移動し、磁気デスク1の磁性体塗布面
に形成された同心円状の情報を記録したトラックをトレ
ースするようになっている。又情報を記録したトラック
は円周方向に等分されたセクター1−2によって分けら
れ、磁気デスクに記録されている情報の場所をトラック
の数pについてo−pまでの番号とセクターの数Bにつ
いて0〜Bまでの番号の両者で番地指定をすることがで
きるようになっている。[Magnetic desk] is usually formed by coating the surface of a non-magnetic disc with fine magnetic powder, and is used to attach the motor shaft 5 of the drive motor 2.
The electric motor 2 rotates at a constant speed. A magnetic head 7 is disposed on the magnetic material-coated surface of the magnetic disk 1 through an extremely narrow gap. Concentric tracks on which information is recorded are traced on the surface coated with magnetic material. Also, the tracks on which information is recorded are divided into sectors 1-2, which are equally divided in the circumferential direction, and the location of the information recorded on the magnetic disk is determined by the number from op to track number p and the number of sectors B. The address can be specified using both numbers 0 to B.
然しなからこのトラックとセクターは磁性塗膜の上に現
実的に線で区画されているのではなく、トラックの境界
は磁気ヘッドの位置決め装置で、又セクターはセクター
信号発生用スリット付円板3によって発生する信号を検
出して所定の番地の検出を行い情報の記録、読み出しを
行うようになっている。このセクター信号発生用スリッ
ト付円板3には第1図(c)に示すように磁気デスク1
に設けるセクター1−2の数と同数のスリット3−1i
円周上に等間隔に設け、該スリット3−1より半径方向
に少し離れた位置に第1図(C′)に示すように1個の
スリット3−2を設け、上記スリット3−1と3−2を
夫々挾んで配置した光源と光電変換器とより成るインタ
ーラブタ4−1.4−2i固定子側に設けである。However, these tracks and sectors are not actually divided by lines on the magnetic coating, but the boundaries of the tracks are defined by a magnetic head positioning device, and the sectors are defined by a disc 3 with a slit for generating sector signals. By detecting the signal generated by the controller, a predetermined address is detected, and information is recorded and read. This disc 3 with slits for generating sector signals has a magnetic disk 1 as shown in FIG. 1(c).
The same number of slits 3-1i as the number of sectors 1-2 provided in
One slit 3-2 is provided at equal intervals on the circumference, and at a position slightly distant from the slit 3-1 in the radial direction, as shown in FIG. 1 (C'). 4-2i is provided on the stator side.
駆動用電動機2を一定速度で回転させると磁気デスク1
とセクター信号発生用スリット付円板3とが同時に回転
しインターラプタ4よりは第1図(d)のようなパルス
信号が出力として取り出される。即ちスリット3−1と
対向するインターラブタ4−1よシ円板1回転について
セフタート同数の8個のパルスが等ピッチで発生し、イ
ンターラプタ4−2より1回転について1個のインデッ
クスパルスが発生する。そこでこのインターラプタ4−
1の出力をカウンタに加え、インターラプタ4−2 の
出力で該カウンタをリセットするように構成すると、該
カウンタの内容はインデックスパルスでリセットして零
となり次に到来するスリット3−1で発生するパルスよ
りカウントし8個までカウントするとインデックスパル
スでリセットされるから、該カウンタの内容がセクタ一
番号を示すことになる。When the driving electric motor 2 is rotated at a constant speed, the magnetic desk 1
and the disk 3 with slits for sector signal generation rotate at the same time, and the interrupter 4 outputs a pulse signal as shown in FIG. 1(d). That is, the interrupter 4-1, which faces the slit 3-1, generates eight pulses, the same number of which are the same as the seftat, at equal pitches per rotation of the disk, and the interrupter 4-2 generates one index pulse per rotation. Occur. So this interrupter 4-
If the output of 1 is added to a counter and the counter is reset by the output of interrupter 4-2, the contents of the counter will be reset to zero by the index pulse and will be generated at the next arriving slit 3-1. When counting from the pulse to 8, the counter is reset by the index pulse, so that the contents of the counter indicate the sector number.
従って指定の番地をトレースするにはトラック番号pに
従って磁気ヘッド7の位置を半径方向駆動装置8によっ
てp番目のトラックに移動させカウンタの出力がnとな
れば指定のp番目トラックのn番目のセクターに達した
と判断し指令信号と検出信号のアンドにより磁気ヘッド
に書込み又は読出しの信号を送れば磁気デスクの所定番
地に情報の書込み又は読出しができる、仕組となってい
る。Therefore, in order to trace a specified address, the position of the magnetic head 7 is moved to the p-th track by the radial drive device 8 according to the track number p, and when the output of the counter becomes n, the position of the magnetic head 7 is moved to the p-th track of the specified p-th track. If it is determined that this has been reached and a write or read signal is sent to the magnetic head by ANDing the command signal and the detection signal, information can be written or read from a predetermined location on the magnetic disk.
然しなからこのセクター信号発生用スリット付円板に設
けるスリット3−1と3−2の加工精度は極めて高いこ
とが要求され、又電動機軸5に対する同心度も高精度に
取り付けないとセクター間のピンチが不等となり磁気デ
スクとの情報の交換が不正確となるという問題があり、
セクター信号発生部のコストを高くする欠陥があった。However, the machining precision of the slits 3-1 and 3-2 provided in this disk with slits for generating sector signals must be extremely high, and the concentricity with respect to the motor shaft 5 must also be set with high precision. There is a problem that the pinch is unequal and the exchange of information with the magnetic desk becomes inaccurate.
There was a defect that increased the cost of the sector signal generator.
例えばセクター数が45の場合のスリット3−1のピッ
チi度は8°±0.05°という高精度であり、スリッ
ト円板の加工とその取付共に高度の熟練者の技術を必要
とし多量生産を妨げている。For example, when the number of sectors is 45, the pitch i degree of slit 3-1 is highly accurate at 8° ± 0.05°, and both the processing of the slit disk and its installation require the skills of highly skilled people, and mass production is required. is hindering.
本発明はこのような欠点?除くようにしたものであって
本発明においては第2図(、)に示すように駆動用電動
機の回転子21に速度検出用永久磁石22を装着し、こ
の永久磁石22に対向して基板6に速度検出用発電巻線
23を取り付け、回転子21に1個の磁性体小片24を
装着しこの小片24に対向して磁気検出器25を基板6
に設ける。Does the present invention have such drawbacks? In the present invention, as shown in FIG. A power generation winding 23 for speed detection is attached to the rotor 21, a small magnetic piece 24 is attached to the rotor 21, and a magnetic detector 25 is mounted on the board 6 opposite to this small piece 24.
Provided for.
速度検出用発電巻線23は第2図(b)に示すように絶
縁板23−4の上に発電用導体23−1を磁気デスク1
のセクター数の2倍の数だけ放対状に等ピッチで円周方
向に離間して配設し、相隣接する導体片の半径方向内方
の端と外方の端を夫々別の導体片23−3と23−2で
交互に接続して連続した巻線とし端子A、Hに接続して
形成する。発電用永久磁石22の上記発電巻線23に対
向する面Vこは第2図(c)に示すようKN@、S袷交
互に上記発電用導体23−1と同数の磁柘ヲ等ピッチで
着磁する。As shown in FIG. 2(b), the power generation winding 23 for speed detection has a power generation conductor 23-1 on an insulating plate 23-4.
The number of sectors is twice as many as the number of sectors. 23-3 and 23-2 are alternately connected to form a continuous winding and connected to terminals A and H. As shown in FIG. 2(c), the surface V of the power generation permanent magnet 22 facing the power generation winding 23 has the same number of magnets as the power generation conductor 23-1 alternately with KN@ and S lines at an equal pitch. Magnetize.
第2図において駆動用電動機2を定速度で回転させると
発電巻線23と鎖交する磁石の磁束が変化して発電用導
体23−1に電圧全誘起し全部の発電用導体23−1に
誘起した電圧は常に同極性であるから全部が直列に加え
られて端子へ、BVC出力が生ずる。鎖交する磁束は磁
石の極性が変る毎に方向が変り誘起する電圧は交流電圧
でこの交流の周期は発電用導体23−1の数の1/2に
当る。又回転子21が回転して回転子21の外周に装着
した小片24が磁気検出器25に対向する毎に磁気検出
器25より出力信号が現れる。In FIG. 2, when the drive motor 2 is rotated at a constant speed, the magnetic flux of the magnet interlinking with the power generation winding 23 changes, and a total voltage is induced in the power generation conductor 23-1. Since the induced voltages always have the same polarity, they are all applied in series to produce a BVC output at the terminal. The direction of the interlinking magnetic flux changes every time the polarity of the magnet changes, and the induced voltage is an alternating voltage, and the period of this alternating current corresponds to 1/2 of the number of power generation conductors 23-1. Further, each time the rotor 21 rotates and the small piece 24 attached to the outer periphery of the rotor 21 faces the magnetic detector 25, an output signal appears from the magnetic detector 25.
発電巻線23と磁気検出器25の出力は第2図(、)に
示すように夫々増幅器30.31と波形整形回路32.
33を介してパルス信号に変換される。即ち第3図(、
)に示すように発電巻線23の出力は永久磁石22の1
極ピツチを周期とする交流となシ、これを増幅器31で
飽和増幅して第3図(b)のように矩形波とし、この矩
形波の極性が←)から(ト)に変化する位置で第3図(
C)に示すようにパルス信号を発生せしめる。この結果
回転子21が1回転する間に発電用導体23−1の数の
1/2の数のパルス、即チ磁気テスク1のセクター1−
2と同数のパルスが発生する。The outputs of the power generation winding 23 and the magnetic detector 25 are outputted to amplifiers 30, 31 and waveform shaping circuits 32, 31, 32, 31, 32, 31, 31, 31, 31, 31, 31, 31, 31, 31, 32, 32, 32, 31, 32, 31, 32, 32, 32, 31, 32, 31, 32, 31, 31, 31, 31, 31,3,3, 4, and 3, respectively, as shown in FIG. 2(,).
33 into a pulse signal. In other words, Figure 3 (,
), the output of the power generation winding 23 is 1 of the permanent magnet 22.
An alternating current with a period of pole pitch is saturated and amplified by the amplifier 31 to form a rectangular wave as shown in Fig. 3(b), and at the position where the polarity of this rectangular wave changes from ←) to (g). Figure 3 (
A pulse signal is generated as shown in C). As a result, during one rotation of the rotor 21, the number of pulses is 1/2 of the number of power generation conductors 23-1, that is, sector 1- of magnetic test 1.
The same number of pulses as 2 are generated.
一方磁気検出器25からは回転子21が1回転する毎に
第2図(d)に示すように1個のパルスが発生するから
このパルス全インデックスパルスとして使用する。発電
巻線23の出力パルスをカウンタに入力し、インデック
スパルスで該カウンタをリセットするように構成すると
、インデックスパルスの到来でカウンタをリセットし、
次に到来するパルスからカウントを開始すルト磁fiデ
スク10セクター1−2と同数までカウントしてリセッ
トされるからカウンタの内容を磁気デスク10セクタ一
信号として使用することができる。On the other hand, since one pulse is generated from the magnetic detector 25 as shown in FIG. 2(d) every time the rotor 21 rotates once, this pulse is used as the total index pulse. If the output pulse of the power generation winding 23 is input to a counter and the counter is reset by the index pulse, the counter is reset by the arrival of the index pulse,
Counting starts from the next pulse and is reset after counting to the same number as the magnetic disk 10 sectors 1-2, so the contents of the counter can be used as signals for the magnetic disk 10 sectors.
発電巻線23の具体的な構成例としては絶縁板をプリン
ト配線板としこれに発電巻線230発電用導体23−1
1(プリント配線の技法で構成する。このようにすれば
発電用導体23−1の等配ピッチの精度も高く、シかも
低いコストで多量生産ができる利点がある。又セクター
信号のピンチ精度は発電巻線23の発電用導体23−1
の等配ピンチの精度と発電用永久磁石22の着磁精度と
両者間の偏心の程度で保持されるものであるが、発電巻
線23の発電用導体23−1全部が直列に接続されてい
るから発生する交流の1サイクルの周期は全巻線の平均
値となり、個々の導体間のピッチ又は磁石の着磁ピンチ
に多少の誤差があってもこれが平均化され、誤差として
現れないので、発電巻線をプリント配線技法で構成して
も充分な精度が得られるという利点がある。As a specific example of the configuration of the power generation winding 23, the insulating board is a printed wiring board, and the power generation winding 230 is connected to the power generation conductor 23-1.
1 (constructed using printed wiring technique. In this way, the accuracy of the equal pitch of the power generation conductor 23-1 is high, and there is an advantage that mass production can be performed at low cost. Also, the pinch accuracy of the sector signal is Power generation conductor 23-1 of power generation winding 23
This is maintained by the accuracy of the equal-distribution pinch, the magnetization accuracy of the power generation permanent magnet 22, and the degree of eccentricity between the two, but all of the power generation conductors 23-1 of the power generation winding 23 are connected in series. The period of one cycle of alternating current generated by the current is the average value of all the windings, and even if there is some error in the pitch between individual conductors or the magnetization pinch of the magnet, this is averaged out and does not appear as an error, so the power generation Even if the windings are constructed using printed wiring techniques, there is the advantage that sufficient accuracy can be obtained.
尚従来装置ではセクター数ケ45としたときセクター間
のピッチ精度は8°±0,05°が必要であるが、本発
明の実施例では8°±0.010 の精度を容易に実
現できる。In the conventional device, when the number of sectors is 45, the pitch accuracy between sectors must be 8°±0.05°, but in the embodiment of the present invention, an accuracy of 8°±0.010 can be easily achieved.
第1図(、)は固定式磁気デスク装置の説明図、第1図
(b)はこの装置に装着した磁気デスク?詳細図、第1
図(、)はセクター信号発生部の詳細図、第1図(C′
)はセクター信号発生用スリット付円板のスリット説明
図、第1図(d)はパルス信号の説明図、第2図(、)
は本発明によるセクター信号発生装置を備えだ磁気デス
ク駆動装置の構成図、第2図(b)は速度検出用発電巻
線の詳細図、第2図(c)は速度検出用永久磁石の詳細
図、第2図(d)は検出信号の波形図、第2図(、)は
パルス信号発生回路図、第3図(a)〜第3図(e)は
夫々発電巻線の出力波形説明図である。
1・・・磁気デスク、2・・・駆動用電動機、3・・・
円板、4・・・インターラック、5・・・電動機軸、6
・・・基板、7・・・磁気−\ラド、8・・・半径方向
駆動装置、21・・・[1転子、22・・・永久磁石、
23・・・発電巻線、23−1・・・発電用導体、23
−2.23−3・・・導体片、23−4・・・絶縁板、
24・・・小片、25・・・磁気検出器、30.31・
・・増幅器、32゜33・・・波形整形回路。
代理人 弁理士 澤 木 誠 −
手続補正書(方式)
昭和57年4 月27日
特許庁長官 島 1)春 樹 殿
1、事件の表示 特願昭56−200109 号
2、発明の名称 磁気デスクのセクター信号発生装
置3、補正をする者
事件との関係 特許出願人
名 称 日本サーボ株式会社
4、代理人
氏 名 (6298) 侑理十 澤 木 誠
−5、補正命令の[1伺 昭和57年 3月 30日
6、補正の対象
(1)明細書の発明の詳細な説明の欄
(2)同図面の簡単な説明の欄
(3)図 面(第1図)
7、補正の内容
<2> 明細書第4頁第6行目のr(c’)Jを「(
e)」と訂正する。
(2)明細書第10頁第11行目のr(e’)Jをr(
e)Jと訂正する。
(3)別紙のとおりFigure 1 (,) is an explanatory diagram of a fixed magnetic desk device, and Figure 1 (b) is a magnetic desk attached to this device. Detailed view, 1st
Figures (,) are detailed diagrams of the sector signal generation section, and Figure 1 (C'
) is an explanatory diagram of the slits in the disk with slits for sector signal generation, Fig. 1 (d) is an explanatory diagram of the pulse signal, and Fig. 2 (,)
2 is a block diagram of a magnetic desk drive device equipped with a sector signal generator according to the present invention, FIG. 2(b) is a detailed diagram of a power generation winding for speed detection, and FIG. 2(c) is a detailed diagram of a permanent magnet for speed detection. Figure 2(d) is a waveform diagram of the detection signal, Figure 2(,) is a pulse signal generation circuit diagram, and Figures 3(a) to 3(e) are explanations of the output waveforms of the power generation windings. It is a diagram. 1...Magnetic desk, 2...Drive motor, 3...
Disc, 4... Interrack, 5... Motor shaft, 6
... Substrate, 7... Magnetism-\rad, 8... Radial drive device, 21... [1st trochanter, 22... Permanent magnet,
23... Power generation winding, 23-1... Power generation conductor, 23
-2.23-3...Conductor piece, 23-4...Insulating plate,
24...Small piece, 25...Magnetic detector, 30.31.
...Amplifier, 32゜33...Waveform shaping circuit. Agent Patent attorney Makoto Sawaki - Procedural amendment (method) April 27, 1980 Commissioner of the Japan Patent Office Shima 1) Haruki Tono1, Indication of case Patent application No. 1982-200109 No.2, Title of invention Magnetic desk Sector signal generator 3, relationship with the amended person case Patent applicant name Nippon Servo Co., Ltd. 4 Agent name (6298) Yuriju Makoto Sawaki
-5. Amendment Order [1] March 30, 1980 6. Subject of amendment (1) Column for detailed explanation of the invention in the specification (2) Column for brief explanation of the same drawing (3) Drawings (Figure 1) 7. Contents of amendment <2> Change r(c')J on page 4, line 6 of the specification to "(
e)”. (2) r(e')J on page 10, line 11 of the specification is r(
e) Correct it as J. (3) As per attached sheet
Claims (1)
周方向に等間隔にN、Sを゛交互に着磁した速度検出用
永久磁石と、該永久磁石に空隙を介して対向配設した発
電巻線と、上記回転子に設けた1個の磁性体小片と、該
小片に空隙を介して対向配設した磁気検出器とより成り
、上記発電巻線は上記永久磁石の磁束と鎖交する複数の
発電用導体を等間隔に配設し、相隣膿する発電用導体の
一端同志及び他端同志を交互に接続して連続した巻線と
したことを特徴とする磁気デスクのセクター信号発生装
置。(1) Permanent magnets for speed detection, which are alternately magnetized with N and S magnets at equal intervals in the circumferential direction, are attached to the rotor of the electric motor for driving the magnetic desk, and are arranged opposite to the permanent magnets with an air gap in between. It consists of a power generation winding, a small piece of magnetic material provided on the rotor, and a magnetic detector placed opposite the small piece with a gap in between, and the power generation winding interlinks with the magnetic flux of the permanent magnet. A sector signal of a magnetic desk characterized in that a plurality of power generation conductors are arranged at equal intervals, and one end and the other end of the power generation conductors that are adjacent to each other are connected alternately to form a continuous winding. Generator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20010981A JPS58102377A (en) | 1981-12-14 | 1981-12-14 | Sector signal generator for magnetic disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20010981A JPS58102377A (en) | 1981-12-14 | 1981-12-14 | Sector signal generator for magnetic disk |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58102377A true JPS58102377A (en) | 1983-06-17 |
JPH0158589B2 JPH0158589B2 (en) | 1989-12-12 |
Family
ID=16418973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20010981A Granted JPS58102377A (en) | 1981-12-14 | 1981-12-14 | Sector signal generator for magnetic disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58102377A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS562191U (en) * | 1979-06-19 | 1981-01-09 | ||
JPS5623821U (en) * | 1979-07-26 | 1981-03-04 | ||
JPS5630475U (en) * | 1979-08-14 | 1981-03-24 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52111253A (en) * | 1976-03-13 | 1977-09-17 | Showa Ooto Kk | Automatic door |
JPS5393700A (en) * | 1977-01-27 | 1978-08-16 | Watanabe Iron Works | Imitation torpedo |
-
1981
- 1981-12-14 JP JP20010981A patent/JPS58102377A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS562191U (en) * | 1979-06-19 | 1981-01-09 | ||
JPS5623821U (en) * | 1979-07-26 | 1981-03-04 | ||
JPS5630475U (en) * | 1979-08-14 | 1981-03-24 |
Also Published As
Publication number | Publication date |
---|---|
JPH0158589B2 (en) | 1989-12-12 |
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