JPS6213736B2 - - Google Patents
Info
- Publication number
- JPS6213736B2 JPS6213736B2 JP55176003A JP17600380A JPS6213736B2 JP S6213736 B2 JPS6213736 B2 JP S6213736B2 JP 55176003 A JP55176003 A JP 55176003A JP 17600380 A JP17600380 A JP 17600380A JP S6213736 B2 JPS6213736 B2 JP S6213736B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- drum
- rotating
- magnetic
- 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.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
Description
【発明の詳細な説明】
本発明は回転ヘツドドラムを用いこれに巻回す
る磁気テープ上にトラツクを形成して画像音声等
の情報を回転ヘツドで記憶または再生する回転ヘ
ツド型磁気記録または再生装置で、特に回転ヘツ
ドの回転位相を光電的に検出するようにした回転
ヘツド型磁気記録または再生装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary head type magnetic recording or reproducing device that uses a rotary head drum to form tracks on a magnetic tape wound around the rotary head to store or reproduce information such as images and sounds. In particular, the present invention relates to a rotating head type magnetic recording or reproducing apparatus in which the rotational phase of a rotating head is photoelectrically detected.
回転ヘツド型磁気記録再生装置においては、例
えば映像信号の記録時には入力映像信号と、また
再生時にはテープ上に記録された映像トラツクと
回転ヘツドとの位相が一致することが必要であ
り、この位相がずれると映像出力が乱れるもので
ある。従つて回転ヘツドドラムを回転させるヘツ
ドモーターは、回転速度の制御を行うと同時に回
転移送制御をも行なう必要がある。このための制
御装置は従来から各種のものが提案され実用化さ
れている。第１図は従来の方法を用いた回転ヘツ
ドドラム構体の一例を示す断面図である。 In a rotating head type magnetic recording/reproducing device, for example, when recording a video signal, it is necessary that the input video signal and the video track recorded on the tape match the phase of the rotating head during playback. If it deviates, the video output will be distorted. Therefore, the head motor that rotates the rotary head drum must not only control the rotational speed but also control the rotational transfer. Various types of control devices for this purpose have been proposed and put into practical use. FIG. 1 is a sectional view showing an example of a rotary head drum structure using a conventional method.
図において、１は回転軸であり、これに回転ド
ラム支持台２が圧入あるいは螺止されてる。これ
に磁気ヘツド５を取付けたヘツド基板４が取付け
てある回転ドラム３が螺止されている。回転ドラ
ム支持台２にはロータリートランス７が装着さ
れ、固定ドラム６に装着された固定トランス７′
との間で映像記録再生信号の受授を行なつてい
る。８は軸受、ａは回転ヘツドモーターのロータ
枠１３に取付けられたロータマグネツト１１を支
持するロータ台である。１０は回転ヘツドモータ
のステーターであり、これに電流を流すことによ
りモータが回転する。１０′はモータの励磁の位
相検波用コイルである。このような装置は従来は
回転磁気ヘツド５と位相角を所定の位置に調整さ
れたマグネツト１２をロータ枠１３の外周面に取
付け、これを固定磁気ヘツド１４で検出し、この
検出信号と映像信号とで位相合せを行なつてい
た。この装置では小さくて高磁束密度を有するマ
グネツト１２を設けなければならず、高価である
うえに部品点数も増加し、まだマグネツト１２と
磁気ヘツド５の位相調整等も必要であつた。 In the figure, reference numeral 1 denotes a rotating shaft, onto which a rotating drum support 2 is press-fitted or screwed. A rotating drum 3 on which a head substrate 4 having a magnetic head 5 attached thereto is screwed. A rotary transformer 7 is mounted on the rotating drum support base 2, and a fixed transformer 7' mounted on the fixed drum 6.
Video recording and playback signals are exchanged between the 8 is a bearing, and a is a rotor stand that supports the rotor magnet 11 attached to the rotor frame 13 of the rotary head motor. Reference numeral 10 denotes a stator of a rotary head motor, and the motor rotates by passing a current through this stator. 10' is a phase detection coil for excitation of the motor. Conventionally, such a device has a rotary magnetic head 5 and a magnet 12 whose phase angle is adjusted to a predetermined position, which is attached to the outer peripheral surface of a rotor frame 13, which is detected by a fixed magnetic head 14, and this detection signal and a video signal are combined. Phase alignment was performed using This device requires a small magnet 12 having a high magnetic flux density, which is expensive, increases the number of parts, and still requires phase adjustment between the magnet 12 and the magnetic head 5.
本発明は上記の如き従来装置の欠点を除いたも
ので、高価なマグネツトを使用せずに簡単な部材
を付加して回転ヘツドの回転位相を検出すること
の出来る装置を提供することを目的とするもので
ある。 The present invention eliminates the drawbacks of the conventional devices as described above, and aims to provide a device that can detect the rotational phase of a rotating head by adding simple members without using expensive magnets. It is something to do.
以下図面によつて本発明を詳細に説明する。第
２図は本発明による回転ヘツドドラム構体の一実
施例を示す断面図で、第１図と同上部分は同一符
号で示してある。また第３図は第２図の装置にお
ける磁気ヘツド取付部の拡大図である。 The present invention will be explained in detail below with reference to the drawings. FIG. 2 is a cross-sectional view showing an embodiment of a rotary head drum structure according to the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. 3 is an enlarged view of the magnetic head mounting portion of the apparatus shown in FIG. 2. FIG.
図において１５，１６は各々発光素子、受光素
子で図では発光ダイオードとフオトトランジスタ
によつて構成している。第３図で示すように磁気
ヘツド５および磁気ヘツド基板４の回転ドラム３
への取付のときの磁気ヘツドの回転ドラム３への
接触を防ぐためにａで示したような切欠部が各磁
気ヘツド取付部に設けてある。 In the figure, reference numerals 15 and 16 denote a light emitting element and a light receiving element, respectively, which are constructed of a light emitting diode and a phototransistor in the figure. As shown in FIG. 3, the rotating drum 3 of the magnetic head 5 and the magnetic head board 4
In order to prevent the magnetic head from coming into contact with the rotating drum 3 when attached to the magnetic head, a notch as shown in a is provided in each magnetic head attachment portion.
第２図で示すように発光素子１５の光を第３図
で示された切欠に向けて発光させ反射光を受光素
子１６で受けるように構成しておくことにより、
回転ドラムの磁気ヘツド取付部以外では反射光量
が大きいので受光素子１６の出力も大きく、切欠
部では出力がほとんどない。よつて第４図ａで示
したような出力信号が得られる。図ａにおいて、
toは１つのヘツドから次のヘツドまでの回転に要
する時間であり、ｎ個のヘツドがついていると1/
ｎ回転ということになる。さらに各ヘツドのアジ
マスの異なる、アジマス記録の場合には第３図で
示した切欠きａの回転方向の長さｂを各ヘツドに
よつて変えておくことにより、例は第４図ｂで示
すように切欠き検出出力の検出時間がt1，t2のよ
うに異ならしめることが可能である。従つて第４
図ｃに示した回路構成により、パルス巾の差を積
分回路によりレベルの差にすることにより比較回
路を通して別々の位相検出信号として制御回路へ
送ることが可能となる。 As shown in FIG. 2, the light emitting element 15 is configured to emit light toward the notch shown in FIG. 3, and the reflected light is received by the light receiving element 16.
Since the amount of reflected light is large in areas other than the magnetic head attachment part of the rotating drum, the output of the light receiving element 16 is also large, and there is almost no output in the notch part. Therefore, an output signal as shown in FIG. 4a is obtained. In figure a,
to is the time required to rotate from one head to the next, and if n heads are attached, 1/
This means n rotations. Furthermore, in the case of azimuth recording where each head has a different azimuth, by changing the length b in the rotational direction of the notch a shown in Fig. 3 for each head, an example is shown in Fig. 4 b. It is possible to make the detection times of the notch detection output different such as t 1 and t 2 . Therefore, the fourth
With the circuit configuration shown in FIG. c, it is possible to convert the difference in pulse width into a difference in level using the integrator circuit and send it as separate phase detection signals to the control circuit through the comparator circuit.
第５図は本発明の他の実施例を示す図である。
第５図ａは磁気ヘツド取付調整用ネジ穴あるいは
穴を示すものでA1は磁気ヘツドの角度調整でA2
は高さ調整を行なう穴である。第５図ｂの断面図
に示すように、これらの穴と同じ回転半径方向位
置に発光素子１５と受光素子１６とによる検出部
を配置すれば、これらの穴の回転位相がそのまま
磁気ヘツドの回転位相を示すことになる。アジマ
ス記録の場合には前述の例と同様に穴径もしくは
穴の個数を変えておくことにより、各磁気ヘツド
の区別が可能となる。 FIG. 5 is a diagram showing another embodiment of the present invention.
Figure 5a shows the screw holes or holes for adjusting the magnetic head installation, A 1 is for adjusting the angle of the magnetic head, and A 2 is for adjusting the magnetic head angle.
is a hole for height adjustment. As shown in the cross-sectional view of FIG. 5b, if a detection section consisting of a light emitting element 15 and a light receiving element 16 is placed at the same rotational radial position as these holes, the rotational phase of these holes will directly correspond to the rotation of the magnetic head. It will show the phase. In the case of azimuth recording, each magnetic head can be distinguished by changing the hole diameter or the number of holes as in the above example.
第５図ｃは第５図ａ，ｂに示した装置の位相検
出信号処理回路のブロツク図で、図ｃのＡで示し
たような検出信号を入力し、インバーター１０１
で反転してＢの信号とし、これを積分回路１０２
を通して比較回路１０３で比較し、その出力で位
相制御回路１０４を作動させて制御信号Ｃを出力
させる。 FIG. 5c is a block diagram of the phase detection signal processing circuit of the device shown in FIGS. 5a and 5b.
is inverted and becomes the B signal, which is sent to the integrating circuit 102.
A comparison circuit 103 compares the signals through the signals, and the output thereof operates a phase control circuit 104 to output a control signal C.
第６図は本発明の他の実施例を示す断面図であ
る。１７はフオトリフレクターを示している。こ
のフオトリフレクターにより回転ドラムに取付け
たヘツド基板４の取付面を反射面とし基板４が通
過するごとに１７の受光素子の出力が変化する。
アジマス記録の場合にはヘツド基板４の巾を変え
ておくか、基板の反射率を変えることにより各磁
気ヘツドの区別が可能となる。この場合の検出信
号処理回路の１例を第７図に示す。図においてＤ
は検出信号、１０５は比較回路、１０６は位相制
御回路であり、Ｅは制御信号出力である。反射率
が各基板により異なるため出力レベルはx1，x2の
ように変化する。t0は各ヘツド間の回転に要する
時間である。これは第７図ｂに示す回路構成で比
較回路を通すことにより区別が可能となる。 FIG. 6 is a sectional view showing another embodiment of the present invention. 17 indicates a photoreflector. This photoreflector uses the mounting surface of the head substrate 4 attached to the rotating drum as a reflecting surface, and the outputs of the 17 light receiving elements change each time the substrate 4 passes.
In the case of azimuth recording, each magnetic head can be distinguished by changing the width of the head substrate 4 or by changing the reflectance of the substrate. An example of a detection signal processing circuit in this case is shown in FIG. In the figure D
is a detection signal, 105 is a comparison circuit, 106 is a phase control circuit, and E is a control signal output. Since the reflectance differs depending on each substrate, the output level changes as x 1 and x 2 . t 0 is the time required for rotation between each head. This can be distinguished by passing it through a comparison circuit with the circuit configuration shown in FIG. 7b.
本実施例では回転上ドラム方式を扱つたが中間
ドラム方式においても全く同様なことが可能であ
る。 Although this embodiment deals with a rotating upper drum system, the same thing is possible with an intermediate drum system.
以上詳細に説明したように、本発明では回転ヘ
ツドの取付機構に設けられたマーク部からの反射
光を検出して回転ヘツドの回転位相検出を行なう
ようにしたため、従来の方法のように高価なマグ
ネツトを使うこともなくなりまた回転ヘツドと被
検出体との角度調整も不要となし得るものであ
る。 As explained in detail above, in the present invention, the rotational phase of the rotary head is detected by detecting the reflected light from the mark provided on the mounting mechanism of the rotary head. There is no need to use a magnet, and there is no need to adjust the angle between the rotating head and the object to be detected.
第１図は従来の磁気記録再生装置の回転ヘツド
ドラム機体の一例を示す断面図、第２図は本発明
による回転ヘツドドラム構体の一実施例を示す断
面図、第３図は第２図示の装置における磁気ヘツ
ド取付部の拡大図、第４図は本発明の装置による
位相検出信号を示す波形図、第５図ａ，ｂは本発
明の他の実施例を示す平面図および断面図、第５
図ｃは第５図ａ，ｂの装置による位相検出信号の
処理回路の一例を示すブロツク図、第６図は本発
明の第３の実施例を示す断面図、第７図ａ，ｂは
第６図の装置における位相検出信号の波形図およ
び信号処理回路のブロツク図である。
１……回転軸、２……回転ドラム支持台、３…
…回転ドラム、４……ヘツド基板、５……回転磁
気ヘツド、６……固定ドラム、７，７′……ロー
タリートランスのローター、ステーター、８……
軸受、９……ローター台、１０……モーターのス
テーター、１１……モーターのローターマグネツ
ト、１２……位相検出用マグネツト、１３……ロ
ーター枠、１４……固定磁気ヘツド、１５……発
光素子、１６……受光素子。
FIG. 1 is a cross-sectional view showing an example of a rotary head drum structure of a conventional magnetic recording/reproducing apparatus, FIG. 2 is a cross-sectional view showing an embodiment of a rotary head drum structure according to the present invention, and FIG. 4 is a waveform diagram showing a phase detection signal by the device of the present invention; FIGS. 5a and 5 are a plan view and a sectional view showing another embodiment of the present invention;
FIG. c is a block diagram showing an example of a phase detection signal processing circuit using the device shown in FIGS. 5a and 5b, FIG. 6 is a sectional view showing a third embodiment of the present invention, and FIGS. 7 is a waveform diagram of a phase detection signal and a block diagram of a signal processing circuit in the apparatus shown in FIG. 6. FIG. 1...Rotating shaft, 2...Rotating drum support base, 3...
...Rotating drum, 4... Head board, 5... Rotating magnetic head, 6... Fixed drum, 7, 7'... Rotary transformer rotor, stator, 8...
Bearing, 9... Rotor stand, 10... Motor stator, 11... Motor rotor magnet, 12... Phase detection magnet, 13... Rotor frame, 14... Fixed magnetic head, 15... Light emitting element , 16... Light receiving element.
Claims (1)
在に支持され、少なくとも１個の磁気ヘツドを外
周面に固設せる回転ドラムを具える回転ヘツドド
ラム構体の外周面に巻回された磁気テープに対し
て前記磁気ヘツドで情報の記録または再生を行う
装置であつて、前記回転ドラムの外周面に対し前
記ヘツドを固設するためのヘツド取付機構に他と
は反射率の異なるマーク部を設け、該マーク部の
通路に対接して配置せる発光素子と受光素子とを
具える光電変換部により反射率の差に基き前記マ
ーク部を検出することにより前記回転ヘツドの回
転位相を検出することを特徴とする回転ヘツド型
磁気記録または再生装置。1. For a magnetic tape wound around the outer circumferential surface of a rotating head drum structure comprising a fixed drum and a rotating drum rotatably supported with respect to the fixed drum and having at least one magnetic head fixed to the outer circumferential surface. A device for recording or reproducing information using the magnetic head, the head mounting mechanism for fixing the head to the outer circumferential surface of the rotating drum is provided with a mark portion having a different reflectance from others, The rotational phase of the rotary head is detected by detecting the mark portion based on a difference in reflectance using a photoelectric conversion unit including a light emitting element and a light receiving element disposed opposite to the passage of the mark portion. A rotating head type magnetic recording or reproducing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55176003A JPS57100650A (en) | 1980-12-12 | 1980-12-12 | Rotary head type magnetic recorder and reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55176003A JPS57100650A (en) | 1980-12-12 | 1980-12-12 | Rotary head type magnetic recorder and reproducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57100650A JPS57100650A (en) | 1982-06-22 |
| JPS6213736B2 true JPS6213736B2 (en) | 1987-03-28 |
Family
ID=16006004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55176003A Granted JPS57100650A (en) | 1980-12-12 | 1980-12-12 | Rotary head type magnetic recorder and reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57100650A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647801Y2 (en) * | 1977-01-13 | 1981-11-09 |
-
1980
- 1980-12-12 JP JP55176003A patent/JPS57100650A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57100650A (en) | 1982-06-22 |
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