JP2686281B2 - Head level difference measuring device for rotary head assembly - Google Patents
Head level difference measuring device for rotary head assemblyInfo
- Publication number
- JP2686281B2 JP2686281B2 JP63127295A JP12729588A JP2686281B2 JP 2686281 B2 JP2686281 B2 JP 2686281B2 JP 63127295 A JP63127295 A JP 63127295A JP 12729588 A JP12729588 A JP 12729588A JP 2686281 B2 JP2686281 B2 JP 2686281B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- rotary
- image
- level difference
- head assembly
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は磁気記録再生装置における回転ヘッドアセ
ンブリのヘッド段差を測定する測定装置に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a measuring device for measuring a head step of a rotary head assembly in a magnetic recording / reproducing device.
第４図は例えば特開昭62−159326号公報に示された従
来の回転ヘッドアセンブリのヘッド段差測定装置であ
る。図において、１は回転ヘッドアセンブリ、1aは上回
転ドラム、1bは下ドラム、２はヘッド、３は対物レン
ズ、５はビデオカメラ、６はモニターテレビ、7a,8bは
ヘッドの像、7b,8bはカーソル、９はモータ駆動回路、1
0は回転パルス検出器、11はマグネット、13は回転パル
ス発生回路、14は回転パルス波位相ずらし回路、15はス
トロボ光源駆動回路、16はキセノンランプ、17は集光レ
ンズである。FIG. 4 shows a conventional head level difference measuring device for a rotary head assembly disclosed in, for example, Japanese Patent Laid-Open No. 62-159326. In the figure, 1 is a rotary head assembly, 1a is an upper rotary drum, 1b is a lower drum, 2 is a head, 3 is an objective lens, 5 is a video camera, 6 is a monitor television, 7a and 8b are head images, 7b and 8b. Is a cursor, 9 is a motor drive circuit, 1
Reference numeral 0 is a rotation pulse detector, 11 is a magnet, 13 is a rotation pulse generation circuit, 14 is a rotation pulse wave phase shift circuit, 15 is a strobe light source drive circuit, 16 is a xenon lamp, and 17 is a condenser lens.
次に動作について説明する。モータ駆動回路９により
一定回転数（例えば1800rpm）で回転させられた上ドラ
ム1aは上面に付いているマグネット11と回転パルス検出
器10により１回転で１周期の矩形波が回転パルス発生回
路13により作られる。この波形の立上りと立下りはおよ
そ回転角にして180゜にあたる。次に例えば立上り波形
により０゜〜180゜位相をずらす回路14により位相がず
れた矩形波をストロボ光源駆動回路15に加え、該回路に
よりキセノンランプ16を瞬時的に発光させる。この光は
集光レンズ17とハーフミラー18および対物レンズ３をへ
て回転ドラム1aに照射され、ずらせる位相を調整するこ
とにより、ヘッド２が対物レンズ３の前に来た瞬間に光
を照射することができる。この時の像としてはビデオカ
メラ５と画像処理回路12により回転しているヘッド２が
あたかも静止したかのごとき像を映し出すことができ
る。この像にカーソル発生回路23によりカーソルを重ね
て表示し、操作者がこの像にカーソル7b,8bを合わせる
ようカーソル7b,8bを上下すると、画像処理回路12（あ
るいはカーソル発生回路23）はこのカーソル間の距離を
２つのヘッドの像7a,8a間のヘッド段差量として表示出
力し、該ヘッド段差量を測定することができる。Next, the operation will be described. The upper drum 1a rotated by the motor drive circuit 9 at a constant rotation speed (for example, 1800 rpm) is rotated by the rotation pulse generation circuit 13 to generate a rectangular wave of one cycle by the magnet 11 and the rotation pulse detector 10 attached to the upper surface. Made The rising and falling edges of this waveform correspond to a rotation angle of 180 °. Next, for example, a rectangular wave whose phase is shifted by a circuit 14 that shifts the phase by 0 ° to 180 ° by a rising waveform is applied to the strobe light source drive circuit 15, and the circuit causes the xenon lamp 16 to instantaneously emit light. This light is radiated to the rotary drum 1a through the condenser lens 17, the half mirror 18 and the objective lens 3, and the phase is adjusted to irradiate the light at the moment when the head 2 comes in front of the objective lens 3. can do. At this time, the video camera 5 and the image processing circuit 12 can display an image as if the rotating head 2 were stationary. When the cursor is superimposed on the image by the cursor generation circuit 23 and the operator moves the cursor 7b, 8b up and down to align the cursor 7b, 8b with the image, the image processing circuit 12 (or the cursor generation circuit 23) displays the cursor. The distance between them can be displayed and output as the head step amount between the two head images 7a and 8a, and the head step amount can be measured.
従来の回転ヘッドアセンブリのヘッド段差測定装置は
以上のように構成されており、光発生のために回転パル
スより位相をずらす量が大きく、従って回転パルス波位
相ずらし回路の時間変動が多く、そのためヘッドの像が
完全に静止せずに回転方向にこきざみに変動した像とな
り、ヘッドギャップが正確に認識できないという重大な
欠点があった。またドラムの回転ムラにより像が変動す
るという欠点があった。The conventional head level difference measuring device of the rotary head assembly is configured as described above, and the phase shift amount is larger than that of the rotation pulse for light generation, and therefore the time variation of the rotation pulse wave phase shift circuit is large, and therefore the head However, there is a serious drawback that the head gap cannot be accurately recognized because the image of No. 1 does not completely stand still but fluctuates in the direction of rotation. Further, there is a drawback that the image varies due to uneven rotation of the drum.
また従来の測定装置は軸受の中心と軸の中心とが静止
状態においても同じであるころがり軸受を用いた回転ヘ
ッドアセンブリでは測定がある程度可能であったが、ス
パイラルグルーブ軸受のような動圧軸受を用いた回転ヘ
ッドアセンブリでは軸受の中心と軸の中心とが変動しや
すいためやはりヘッドの像の変動が大きく、ヘッド段差
の測定は困難であった。In addition, the conventional measuring device was able to measure to some extent with a rotary head assembly that uses a rolling bearing in which the center of the bearing and the center of the shaft are the same even in a stationary state, but a dynamic bearing such as a spiral groove bearing can be used. In the rotary head assembly used, the center of the bearing and the center of the shaft are likely to fluctuate, so that the image of the head also fluctuates greatly and it is difficult to measure the head step.
この発明は上記のような問題点を解消するためになさ
れたもので、回転ドラムの回転ムラがあってもヘッドの
像が完全に静止し、しかもヘッドギャップが明確に認識
でき、正確なヘッド段差を測定できる回転ヘッドアセン
ブリのヘッド段差測定装置を得ることを目的とする。The present invention has been made to solve the above problems, and even if there is uneven rotation of the rotating drum, the image of the head is completely stationary, and the head gap can be clearly recognized, so that an accurate head step difference is obtained. An object of the present invention is to obtain a head step measuring device for a rotary head assembly that can measure
この発明に係る回転ヘッドアセンブリのヘッド段差測
定装置は、回転位相を検出する検出器と、検出器出力を
矩形波にする波形成形器と、ヘッド切欠窓を検出する非
接触光学変位計と、この出力を矩形波にする波形成形器
と、前記２つの成形矩形波をカウントするカウンタとを
設け該カウンタによりヘッド切欠窓による矩形波の位相
を正確に遅らせるようにし、該矩形波に基づきパルス光
を発生し、これをヘッドに照射するようにしたものであ
る。A head level difference measuring device for a rotary head assembly according to the present invention includes a detector for detecting a rotational phase, a waveform shaper for making a detector output into a rectangular wave, a non-contact optical displacement meter for detecting a head notch window, A waveform shaper for making the output a rectangular wave and a counter for counting the two shaped rectangular waves are provided so that the phase of the rectangular wave by the head notch window is accurately delayed by the counter, and pulse light is generated based on the rectangular wave. It is generated and the head is irradiated with this.
この発明における回転ヘッドアセンブリのヘッド段差
測定装置は１回転に１周期の回転位相波形の立上り又は
立下りのタイミングよりヘッド切欠窓から作り出した矩
形波をカウントし、所定のカウント数の入力条件に従っ
て規定パルス数だけ時間的に遅れたパルスを作り出し、
これに基づきパルス光を発光させてヘッドに照射するよ
うにしたから、回転ヘッドアセンブリの回転中の動的状
態でヘッドの段差を測定することができ、精度の高い測
定を行なうことができる。The head step measuring device of the rotary head assembly according to the present invention counts the rectangular wave generated from the head notch window at the rising or falling timing of the rotation phase waveform of one cycle per one rotation, and defines it according to the input condition of the predetermined count number. Create a pulse that is delayed in time by the number of pulses,
Since the pulsed light is emitted based on this to irradiate the head, the step difference of the head can be measured in a dynamic state during rotation of the rotary head assembly, and highly accurate measurement can be performed.
以下、この発明の一実施例を図に基づいて説明する。
第１図において、1,2,3,5,6,7,8,9,10,11,12,18,23は従
来装置と同様のものであり、24はパルスレーザ発光体、
25はパルスレーザ駆動回路、26は１回転に１周期の矩形
波を出力する回転位相波成形器、27は回転周波数波成形
器、28はパルスカウンタ、29はサーボ回路、30は窓位置
検出波成形器、31は非接触光学変位計、32は微動台、32
aは微動台調整ノブ、33は回転周波数検出器である。An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, 1,2,3,5,6,7,8,9,10,11,12,18,23 are the same as those of the conventional device, 24 is a pulse laser emitter,
25 is a pulse laser drive circuit, 26 is a rotary phase wave shaper that outputs a rectangular wave of one cycle per revolution, 27 is a rotational frequency wave shaper, 28 is a pulse counter, 29 is a servo circuit, 30 is a window position detection wave. Molding machine, 31 is a non-contact optical displacement meter, 32 is a fine movement table, 32
a is a fine movement table adjustment knob, and 33 is a rotation frequency detector.
次に動作について説明する。第１図において、上回転
ドラム1aが回転すると、マグネット11が回転パルス検出
器10を通過することにより、第２図（a1）に示す回転パ
ルス検出波形を得る。これを回転位相波成形器26で矩形
波に変換し、回転位相波a2を得る。また回転周波数検出
器33は複数の磁極がS,N,S,Nと交互にしかも等間隔に置
かれたマグネットにより１回転中に例えば８パルスを検
出可能としており、該回転周波数波検出器33により検出
した波形を回転周波数波成形器27により矩形波に変換
し、回転周波数波（第２図（ｂ））を得る。そしてこれ
と前記回転位相波a2とによりサーボ回路29で回転ドラム
の位相と速度を制御し、モータ駆動回路９をコントロー
ルして回転ドラム1aを一定回転させる。次に例えば回転
位相波の立上りを基準にパルスカウンタ28をリセット
し、窓位置検出波成形波c2をカウントする。ここでc2は
次のように検出する。Next, the operation will be described. In FIG. 1, when the upper rotary drum 1a rotates, the magnet 11 passes through the rotary pulse detector 10 to obtain the rotary pulse detection waveform shown in FIG. 2 (a1). The rotary phase wave shaper 26 converts this into a rectangular wave to obtain a rotary phase wave a2. Further, the rotation frequency detector 33 is capable of detecting, for example, 8 pulses during one rotation by magnets having a plurality of magnetic poles alternating with S, N, S, N and at equal intervals. The waveform detected by is converted into a rectangular wave by the rotational frequency wave shaper 27 to obtain a rotational frequency wave (FIG. 2 (b)). The servo circuit 29 controls the phase and speed of the rotary drum by this and the rotary phase wave a2, and controls the motor drive circuit 9 to rotate the rotary drum 1a at a constant speed. Next, for example, the pulse counter 28 is reset on the basis of the rising edge of the rotation phase wave, and the window position detection wave shaping wave c2 is counted. Here, c2 is detected as follows.
パルスレーザで観測するための対物レンズ３とちょう
ど180゜反対方向に非接触変位計31を微動台32で固定し
て設置する。変位計31の計測点を回転ドラム1aのヘッド
切欠窓に向ける。この状態を第３図（ｂ）に示す。例え
ばカウンタの１カウント目に回転ドラムの切欠窓Ａが変
位計31の前を通過するとする。この時、レーザパルスを
パルス波ａのタイミングで発光すると窓Ａと180゜反対
方向の窓Ｃに取付けられたヘッドが対物レンズ３を通し
て観測される。パルス波ａは第２図の窓位置検出波c1を
成形した矩形波c2をカウンタでカウントすることで得
る。このカウント数を変化することによりレーザパルス
発光の位相をずらし、観測するヘッドの位置を変える。
この実施例は窓が４個のタイプの回転ドラムで、それぞ
れの窓にはヘッドが固定されており、例えば上記カウン
ト数を1,2,3,4とすることによりそれぞれC,D,A,Bの４個
のヘッドを観測することができる。この時レーザパルス
はパルスレーザ発光体24からハーフミラー18を通してヘ
ッドに照射され、これをビデオカメラ５により従来装置
と同様にしてモニターテレビ６に表示し、カーソル7b,7
cをヘッドの像に合わせることによりカーソル間の距離
として、ヘッド段差を測定する。また両ヘッド像の位置
調整は微動台32のノブ32aを回して行なう。A non-contact displacement meter 31 is fixedly installed by a fine movement table 32 in a direction opposite 180 ° to the objective lens 3 for observation with a pulse laser. The measurement point of the displacement meter 31 is directed to the head cutout window of the rotary drum 1a. This state is shown in FIG. For example, assume that the cutout window A of the rotary drum passes in front of the displacement meter 31 at the first count of the counter. At this time, when the laser pulse is emitted at the timing of the pulse wave a, the head mounted on the window C opposite to the window A by 180 ° is observed through the objective lens 3. The pulse wave a is obtained by counting a rectangular wave c2 formed by shaping the window position detection wave c1 shown in FIG. 2 with a counter. By changing this count number, the phase of laser pulse emission is shifted to change the position of the head to be observed.
In this embodiment, a rotary drum having four windows is provided, and a head is fixed to each window. For example, by setting the above count numbers to 1, 2, 3, 4 respectively, C, D, A, 4 heads of B can be observed. At this time, the laser pulse is emitted from the pulse laser emitting body 24 to the head through the half mirror 18, and this is displayed on the monitor television 6 by the video camera 5 in the same manner as in the conventional apparatus, and the cursors 7b and 7 are displayed.
The head step is measured as the distance between the cursors by matching c to the image of the head. The positions of the images of both heads are adjusted by turning the knob 32a of the fine movement table 32.
このような本実施例においては、１回転に１周期の回
転位相波形の立上り又は立下りのタイミングより、複数
のヘッド切欠窓を有する回転ドラムの該ヘッド切欠窓か
ら作り出した矩形波を所定数だけカウントし、該カウン
ト数に従って規定パルス数だけ時間的に遅れた波形を作
り出し、これに基づきパルス光を発光させ、ヘッドに照
射するようにしたので、ヘッドに照射すべき光の位相を
ずらす回路の時間変動が大きいということがなく、回転
ヘッドアセンブリの回転中の動的状態でヘッドが静止し
たかのような映像をより高精度に得ることができる。こ
のため例えばスパイラルグループ軸受のような動圧軸受
を用いた回転ヘッドアセンブリ等においてもヘッド段差
測定時のヘッドの像の変動を少なくでき、精度の高い測
定ができる。In this embodiment, a predetermined number of rectangular waves are generated from the head cutout window of the rotary drum having a plurality of head cutout windows at the rising or falling timing of the rotation phase waveform of one cycle per one rotation. Counting is performed, a waveform delayed in time by a prescribed number of pulses is generated according to the count number, pulsed light is emitted based on this, and the head is irradiated. Therefore, the phase of the light to be irradiated to the head is shifted. It is possible to obtain an image as if the head was stationary in a dynamic state during rotation of the rotary head assembly with higher accuracy without causing a large time fluctuation. Therefore, for example, even in a rotary head assembly using a dynamic pressure bearing such as a spiral group bearing, it is possible to reduce variations in the image of the head when measuring the head step, and to perform highly accurate measurement.
以上のように、この発明によれば１回転に１周期の回
転位相波の立上り又は立下りのタイミングより、複数の
ヘッド切欠窓を有する回転ドラムの該ヘッド切欠窓から
作り出した矩形波を所定数だけカウントし、該カウント
数に従って規定パルス数だけ時間的に遅れた波形を作り
出し、これに基づきパルス光を発光させ、ヘッドに照射
するようにしたので、回転ヘッドアセンブリの回転中の
動的状態においてヘッド段差を高精度に測定できるとい
う効果がある。As described above, according to the present invention, a predetermined number of rectangular waves generated from the head cutout window of a rotary drum having a plurality of head cutout windows are obtained from the rising or falling timing of the rotation phase wave of one cycle per one rotation. Therefore, the pulsed light is emitted based on the waveform which is delayed in time by the specified number of pulses according to the counted number, and the head is irradiated with the pulsed light. Therefore, in the dynamic state during the rotation of the rotary head assembly. There is an effect that the head step can be measured with high accuracy.
第１図はこの発明の一実施例による回転ヘッドアセンブ
リのヘッド段差測定装置を示す構成図、第２図および第
３図は上記装置の動作を説明するための図、第４図は従
来の回転ヘッドアセンブリのヘッド段差測定装置を示す
構成図である。 １は回転ヘッドアセンブリ、２はヘッド、５はビデオカ
メラ、６はモニターテレビ、7a,8aはヘッドの像、7b,8b
はカーソル、９はモータ駆動回路、10は回転パルス検出
器、11はマグネット、26は回転位相波成形器、31は非接
触光学変位計、30は窓位置検出波成形器、28はパルスカ
ウンタ、12は画像処理回路である。FIG. 1 is a block diagram showing a head level difference measuring device for a rotary head assembly according to an embodiment of the present invention, FIGS. 2 and 3 are views for explaining the operation of the device, and FIG. It is a block diagram which shows the head level difference measuring device of a head assembly. 1 is a rotary head assembly, 2 is a head, 5 is a video camera, 6 is a monitor TV, 7a and 8a are head images, and 7b and 8b
Is a cursor, 9 is a motor drive circuit, 10 is a rotation pulse detector, 11 is a magnet, 26 is a rotary phase wave shaper, 31 is a non-contact optical displacement meter, 30 is a window position detection wave shaper, 28 is a pulse counter, Reference numeral 12 is an image processing circuit.
Claims (1)
ンブリの回転ドラム側面に付設された複数のヘッドを撮
像するためのテレビカメラと、上記ヘッドの像を画面上
に映像するモニターテレビとを有し、 上記画面上で移動可能な複数のカーソルを上記各ヘッド
の像に対して所定位置に合わせることによりそれら各ヘ
ッド間の段差を測定する回転ヘッドアセンブリのヘッド
段差測定装置において、 上記回転ドラムに取り付けられ該ドラムの回転時、１回
転中に１個または２個通過するマグネットの磁力を検出
可能なように装置に固定された検出手段と、 上記回転ドラムのヘッド切欠窓を検出する非接触変位計
およびその出力を矩形波にする波形成形器と、 前記検出手段により検出された磁力から上記回転ドラム
の１回転に同期する矩形波を発生し、該矩形波の立ち上
がり又は立ち下がりのタイミングよりヘッド切欠窓を検
出する上記非接触変位計の出力を上記波形成形器によっ
て成形した矩形波をカウントし、所定のカウント数の入
力条件に従って規定パルス数だけ時間的に遅れたパルス
を出力するカウンタと、 上記カウンタのパルスに応じて上記ヘッドに瞬時光を照
射する光発生手段と、 上記照射されたヘッドの像を映像にする上記テレビカメ
ラから映像信号を受け、上記モニターテレビの画面上に
上記ヘッドの像を静止状態で映像させ、この映像された
複数のヘッドの各位置に操作者により合わせられた上記
カーソル間の距離から上記回転ヘッドアセンブリのヘッ
ド段差を演算する画像処理回路とを備えたことを特徴と
する回転ヘッドアセンブリのヘッド段差測定装置。1. A television camera for picking up a plurality of heads attached to a side surface of a rotary drum of a rotary head assembly in a magnetic recording / reproducing apparatus, and a monitor television for displaying an image of the heads on a screen. A head level difference measuring device of a rotary head assembly for measuring a level difference between the heads by aligning a plurality of cursors movable on the screen with a predetermined position with respect to an image of the heads. A detection unit fixed to the device so as to detect the magnetic force of one or two magnets that pass during one rotation when the drum rotates; a non-contact displacement meter that detects the head notch window of the rotating drum; A waveform shaper whose output is a rectangular wave, and a rectangular wave which is synchronized with one rotation of the rotary drum from the magnetic force detected by the detection means. The rectangular wave formed by the waveform shaper is used to count the output of the non-contact displacement meter that detects the head notch window from the rising or falling timing of the rectangular wave, and is defined according to the input condition of a predetermined count number. From a counter that outputs a pulse delayed by the number of pulses, a light generation unit that irradiates the head with instantaneous light in response to the pulse of the counter, and the television camera that produces an image of the irradiated head as an image. Upon receiving a video signal, the head television image is displayed on the screen of the monitor television in a stationary state, and the rotary head assembly is moved from the distance between the cursors adjusted by the operator at each position of the plurality of the imaged heads. And an image processing circuit for calculating the head level difference, the head level difference measuring device for a rotary head assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63127295A JP2686281B2 (en) | 1988-05-25 | 1988-05-25 | Head level difference measuring device for rotary head assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63127295A JP2686281B2 (en) | 1988-05-25 | 1988-05-25 | Head level difference measuring device for rotary head assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01296423A JPH01296423A (en) | 1989-11-29 |
| JP2686281B2 true JP2686281B2 (en) | 1997-12-08 |
Family
ID=14956428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63127295A Expired - Fee Related JP2686281B2 (en) | 1988-05-25 | 1988-05-25 | Head level difference measuring device for rotary head assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2686281B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0810526B2 (en) * | 1988-10-25 | 1996-01-31 | シャープ株式会社 | Floppy disk drive control system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6020015U (en) * | 1983-07-20 | 1985-02-12 | 株式会社日立製作所 | VTR upper cylinder phase detection device |
| JPS62159326A (en) * | 1986-01-07 | 1987-07-15 | Mitsubishi Electric Corp | Measuring instrument for head level difference of rotary head assembly |
-
1988
- 1988-05-25 JP JP63127295A patent/JP2686281B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01296423A (en) | 1989-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |