JPS6061901A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS6061901A JPS6061901A JP16923483A JP16923483A JPS6061901A JP S6061901 A JPS6061901 A JP S6061901A JP 16923483 A JP16923483 A JP 16923483A JP 16923483 A JP16923483 A JP 16923483A JP S6061901 A JPS6061901 A JP S6061901A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- photodetecting
- emitting element
- rotary 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
Links
Classifications
-
- 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
- G11B5/52—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 simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
-
- 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
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
- G11B15/14—Masking or switching periodically, e.g. of rotating heads
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は回転ヘッド・ヘリカルスキャン方式の磁気記録
再生装置に係り、特に回転ヘッドと信号処理回路との結
合方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotating head helical scan type magnetic recording/reproducing device, and more particularly to a coupling method between a rotating head and a signal processing circuit.
回転ヘッド・ヘリカルスキャン方式の磁気記録再生装置
において1回転しているヘッドに信号電流を流したり、
信号を取り出したりする為に、主として回転トランスが
使われている。第1図(a)は従来、回転ヘッドと信号
処理回路の結合に使われている回転トランスの概略断面
図、第1図(b)はその簡単な等価回路である。モータ
の回転軸11に取付けられた回転子(ロータ)12と固
定シリンダ13に固定された固定子(ステータ)14と
が非常に小さなギャップ15をはさんで対向し、回転子
12と固定子14に同心円状に掘された溝に巻かれた隘
1コイル16.N12コイル17.隆3コイル18.鳩
4コイル19.シ画一トリング20゜21とで、2個の
トランスを形成する。すなわち−1コイル16と翫30
イル18が磁性体で出来た回転子12と固定子14を磁
心としてギャップ15を介して結合し、トランスを形成
する。同様にN2コイル17と一4コイル19とがトラ
ンスを形成する。回転ヘッドと信号処理回路の増幅器や
駆動回路とはこの回転トランスによって結合され信号の
やりとりが行われる。@1図(blは第1図(a)の回
転トランスの簡単な等何回路で対応する巻線には同じ番
号を付してお(。コイル16 、 J、 8による回転
トランスの回転子側の端子22.23は第1の回転ヘッ
ドに接続され固定子側の端子24゜25は信号処理回路
に接続される。′f、たコイル17゜による回転トラン
スの回転子側の端子26.27は第2の回転ヘッドに接
続され、固定子側の端子28.29は信号処理回路に接
続される。このよ)密加工が要求されてコスト高になる
等の欠点がある。すなわち回転トランスにおいて挿入損
失を少なくするためには結合係数を太き(しなければな
らないがトランスの結合は回転子12と固定子14との
磁心のギャップ15をいかに小さくするかによるので、
例えば現在床(使われている家庭用VTRにおいては5
0μm〜100μmという極めて小さなギャップとしな
ければならず工作精度を極めて高くしなければならない
という欠点があった。In a rotating head/helical scan type magnetic recording/reproducing device, a signal current is passed through the head that rotates once,
Rotating transformers are mainly used to extract signals. FIG. 1(a) is a schematic sectional view of a rotary transformer conventionally used for coupling a rotary head and a signal processing circuit, and FIG. 1(b) is a simple equivalent circuit thereof. A rotor 12 attached to the rotating shaft 11 of the motor and a stator 14 fixed to a fixed cylinder 13 face each other with a very small gap 15 in between. 1 coil 16. Wound in a groove concentrically dug in. N12 coil 17. Takashi 3 coil 18. Pigeon 4 coils 19. The square rings 20° and 21 form two transformers. i.e. -1 coil 16 and rod 30
A rotor 12 and a stator 14 made of magnetic material are coupled together via a gap 15 using a magnetic core to form a transformer. Similarly, the N2 coil 17 and the 14th coil 19 form a transformer. The rotary head and the amplifier and drive circuit of the signal processing circuit are coupled through this rotary transformer, and signals are exchanged. @Figure 1 (bl is a simple circuit of the rotary transformer in Figure 1 (a), and the corresponding windings are given the same numbers. The terminals 22 and 23 of the rotary transformer are connected to the first rotating head, and the terminals 24 and 25 on the stator side are connected to the signal processing circuit. is connected to the second rotary head, and the terminals 28 and 29 on the stator side are connected to the signal processing circuit.There are disadvantages such as high cost due to the requirement of precision machining.In other words, in the rotary transformer, In order to reduce insertion loss, the coupling coefficient must be made thicker, but the coupling of the transformer depends on how small the gap 15 between the magnetic cores between the rotor 12 and the stator 14 is made.
For example, the current floor (5
The disadvantage is that the gap must be extremely small, from 0 μm to 100 μm, and the machining accuracy must be extremely high.
またトランス結合のため直流成分や低周波成分を伝送す
ることが出来ないという欠点もあった。Another drawback was that it was unable to transmit direct current components or low frequency components due to transformer coupling.
本発明はこのような事情を考慮してなされたものでその
目的とするところは1回転ヘッド・ヘリカルスキャン方
式の磁気記録再生装置において構造的に精密加工が要求
されない。すなわち工作精度が低くても良(、更に直流
成分の伝送が可能な回転ヘッドと信号処理回路との結合
方式を提供することにある。The present invention has been devised in consideration of these circumstances, and its purpose is to eliminate the need for precision structural machining in a single-rotation head helical scan type magnetic recording/reproducing device. That is, the object of the present invention is to provide a coupling method between a rotary head and a signal processing circuit that can transmit a DC component even if the machining accuracy is low.
本発明は回転ヘッドディスクの回転軸上の回転ヘッドデ
ィスクに取り付けられた受光又は発光素子と前記回転軸
の延長上に置かれた固定した受光又は発光素子と、前記
回転ヘッドディスクの回転軸上に取り付けられた受光又
は発光素子と光結合により信号伝送可能な位置に固定し
友受光又は発光素子と、回転軸上の固定され九受光又は
発光素子と光結合により信号伝送可能な回転ヘッドディ
スク上に取り付けられた受光又は発光素子とにより、対
向する回転ヘッドディスク上の素子と固定された素子の
間を光伝送を行って回転ヘッドと信号処理回路の結合を
行うものである。The present invention includes a light-receiving or light-emitting element attached to the rotary head disk on the rotation axis of the rotary head disk, a fixed light-receiving or light-emitting element placed on an extension of the rotation axis, and a light-receiving or light-emitting element attached to the rotation axis of the rotary head disk. One light-receiving or light-emitting element is fixed at a position where signals can be transmitted by optical coupling with the attached light-receiving or light-emitting element, and the rotating head disk is fixed on the rotating shaft and can transmit signals by optical coupling with the nine light-receiving or light-emitting elements. The attached light-receiving or light-emitting element performs optical transmission between the element on the opposing rotary head disk and the fixed element, thereby coupling the rotary head and the signal processing circuit.
このように本発明は回転ヘッドディスク上の2個の受光
又は発光素子と、固定された2個の受光又は発光素子と
の間の光伝送により回転′\ラッド信号処理の結合を行
うことにより従来の回転トランスのように工作精度を高
(することな(容易に信号の伝送が出来、更に回転トラ
ンスのようなインダクタンスをもった伝送ではないので
直流成分の伝送も可能となる利点もある。As described above, the present invention combines rotary '\rad signal processing by optical transmission between two light-receiving or light-emitting elements on a rotating head disk and two fixed light-receiving or light-emitting elements. It has the advantage of being able to easily transmit signals without requiring high machining precision like a rotary transformer, and it also has the advantage of being able to transmit DC components as it does not have inductance like a rotary transformer.
以下1図面を参照して本発明の一実施例について説明す
る。An embodiment of the present invention will be described below with reference to one drawing.
第2図は本発明を適用して構成される回転ヘッドと信号
処理回路の結合方式の概略断面図で、31は回転ヘッド
ディスク、32は固定子、33.34は発光素子、35
.36は受光素子である。回転ヘッドディスク31に取
付けられた回転ヘッドに信号処理回路からの信号を伝送
して記録する場合には記録信号でLEDなとの発光素子
34を駆動し1発光素子34がらの光を受光素子35で
受けて信号を取り出す、受光素子35からの信号により
回転ヘッドに信号電流を流して記録を行う。一方再生時
には回転ヘッドから再生信号により発光素子33を駆動
し発光素子33に対向する受光素子36で受けて信号を
取り出す。この時発光素子33は回転ヘッドディスクの
回転軸を中心に回転するが発光素子33の中心軸が受光
素子36を通れば受光素子36への光の入射角は回転に
より変化するが充分受信可能な角度である。同様に受光
素子35への入射角も回転によりて変化するが発光素子
33.34を回転軸に非常に近く設置すれば、入射角は
充分小さくなり受信するのに支障を起すことはない。回
転ヘッドディスク上に取り付けた発光素子33と受光素
子35の消費電力はモータ軸37の下部に取り付けられ
たスリップリングまたは発光素子と太陽電池の組合せ等
によって容易に供給出来る。このようにして回転ヘッド
と信号処理回路を結合する光送受信回路による結合方式
は回転トランスのような回転子と固定子との工作精度を
問題とすることな(更に直流成分までの伝送が可能とな
る。FIG. 2 is a schematic cross-sectional view of a coupling method of a rotary head and a signal processing circuit constructed by applying the present invention, in which 31 is a rotary head disk, 32 is a stator, 33 and 34 are light emitting elements, and 35
.. 36 is a light receiving element. When recording by transmitting a signal from a signal processing circuit to the rotary head attached to the rotary head disk 31, the recording signal drives a light emitting element 34 such as an LED, and the light from one light emitting element 34 is transmitted to a light receiving element 35. Recording is performed by passing a signal current through the rotary head in response to a signal from the light receiving element 35, which is received and extracted by the light receiving element 35. On the other hand, during reproduction, the light emitting element 33 is driven by a reproduction signal from the rotating head, and the signal is received by the light receiving element 36 facing the light emitting element 33 and taken out. At this time, the light emitting element 33 rotates around the rotation axis of the rotary head disk, but if the central axis of the light emitting element 33 passes through the light receiving element 36, the angle of incidence of light on the light receiving element 36 changes due to rotation, but sufficient reception is possible. It's an angle. Similarly, the angle of incidence on the light-receiving element 35 changes with rotation, but if the light-emitting elements 33, 34 are placed very close to the rotation axis, the angle of incidence will be sufficiently small to cause no problem in reception. The power consumption of the light emitting element 33 and the light receiving element 35 mounted on the rotating head disk can be easily supplied by a slip ring attached to the lower part of the motor shaft 37 or a combination of the light emitting element and a solar cell. In this way, the coupling method using the optical transmitter/receiver circuit that couples the rotating head and the signal processing circuit eliminates the problem of machining accuracy between the rotor and stator like in a rotary transformer (in addition, it is possible to transmit up to DC components). Become.
以上説明したように本発明による回転ヘッドと信号処理
回路との結合方式は構造的に精密加工が要求されないの
でコストが非常に低(なる利点があるのみならず、直流
成分の伝送が可能なので信号処理が容易になる等の利点
もある。As explained above, the method of coupling the rotary head and the signal processing circuit according to the present invention not only has the advantage of being extremely low in cost because it does not require structural precision machining, but also has the advantage of being able to transmit DC components, so it is possible to transmit signals. There are also advantages such as easier processing.
尚、本発明は上記実施例に限定されるものではない。例
えば上記実施例では回路軸上に受光素子、を配置したが
回転軸上に発光素子を置き対向する位置を受光素子とし
ても良いことは勿論であり要はその対向する位置に発光
素子と受光素子を配置することにある。要するに本発明
はその要旨を逸脱しない範囲で種々変形して実施するこ
とが出来る。Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the light-receiving element is placed on the circuit axis, but it is of course possible to place the light-emitting element on the rotation axis and use the opposite position as the light-receiving element. It consists in arranging. In short, the present invention can be implemented with various modifications without departing from the gist thereof.
第1図は回転トランスの概略断面図とその簡単な等価回
路、第2図は本発明を適用した回転ヘッドディスクと信
号処理回路の結合回路の概略断面図である。
12・・・回転子、14・・・固定子、16.17,1
8゜19・・・コイル、31・・・回転ヘッドディスク
、33゜34・・・発光素子、35.36・・・受光素
子。
代理人弁理士 則 近 憲 佑(ほか1名)第1図
1に1)
第2図FIG. 1 is a schematic sectional view of a rotary transformer and its simple equivalent circuit, and FIG. 2 is a schematic sectional view of a coupling circuit of a rotary head disk and a signal processing circuit to which the present invention is applied. 12...Rotor, 14...Stator, 16.17,1
8゜19... Coil, 31... Rotating head disk, 33゜34... Light emitting element, 35.36... Light receiving element. Representative Patent Attorney Kensuke Chika (and 1 other person) Figure 1 1) Figure 2
Claims (1)
において1回転ヘッドディスクの回転軸上の回転ヘッド
ディスク上に配置された受光又は発光素子と、前記回転
軸の延長上に固定されて配置された受光または発光素子
と、前記2カ所に配置された受光又は発光素子と対向す
るそれぞれ回転へラドディス2上及び固定点に配置され
た発光又は受光素子とを備え、前記回転ヘッドディスク
上の受光又は発光素子と固定され九受光又は発光素子の
間で光伝送を行って、回転ヘッドと信号処理回路との信
号の結合を行うようにしたことを特徴とする磁気記録再
生装置。In a rotating head/helical scan type magnetic recording/reproducing device, a light receiving or emitting element disposed on a rotating head disk on a rotating shaft of a single rotating head disk, and a light receiving or emitting element fixedly arranged on an extension of the rotating shaft. A light-emitting element, and a light-emitting or light-receiving element disposed on the rotating RAD disk 2 and at a fixed point, respectively, facing the light-receiving or light-emitting element disposed at the two locations, the light-receiving or light-emitting element on the rotating head disk and 1. A magnetic recording and reproducing device characterized in that a signal is coupled between a rotary head and a signal processing circuit by transmitting light between nine fixed light-receiving or light-emitting elements.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16923483A JPS6061901A (en) | 1983-09-16 | 1983-09-16 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16923483A JPS6061901A (en) | 1983-09-16 | 1983-09-16 | Magnetic recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6061901A true JPS6061901A (en) | 1985-04-09 |
Family
ID=15882715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16923483A Pending JPS6061901A (en) | 1983-09-16 | 1983-09-16 | Magnetic recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6061901A (en) |
-
1983
- 1983-09-16 JP JP16923483A patent/JPS6061901A/en active Pending
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