JPH0351777Y2 - - Google Patents
Info
- Publication number
- JPH0351777Y2 JPH0351777Y2 JP6496385U JP6496385U JPH0351777Y2 JP H0351777 Y2 JPH0351777 Y2 JP H0351777Y2 JP 6496385 U JP6496385 U JP 6496385U JP 6496385 U JP6496385 U JP 6496385U JP H0351777 Y2 JPH0351777 Y2 JP H0351777Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- light receiving
- magnetic recording
- control signal
- movable
- 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
- 239000013307 optical fiber Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
この考案はヘリカルスキヤン方式のVTR等に
用いられる磁気記録再生装置にあつて、回転ドラ
ム内に配置された可動磁気ヘツドを制御する制御
装置に関するものである。
This invention relates to a control device for controlling a movable magnetic head disposed within a rotating drum in a magnetic recording/reproducing device used in a helical scan VTR or the like.
従来、この種の磁気記録再生装置としては、第
２図に示すものが知らされている。第２図におい
て、１は上ドラムであり、図示しないモータで回
転駆動される回転軸８に支持されている。また上
ドラム１には軸方向に可動する可動磁気ヘツド５
が圧電素子４を介して配設されている。２は固定
ドラムであり、ヘリカルに巻装される磁気テープ
（図示せず）を定位置に規制するものである。３
は上ドラム１と固定ドラム２とに設けられたロー
タリトランスであり、上ドラム１に設けられる固
定磁気ヘツド（図示せず）および可動磁気ヘツド
５の信号を無接触で伝達する機能を有する。６は
固定端に固定され、可動磁気ヘツド５を軸方向に
可動する制御信号（高圧電圧）を供給するブラシ
部であり、この制御信号は上ドラム１の上部に設
けられた給電部７に伝達され、可動磁気ヘツド５
の圧電素子４に供給されるようになつている。
このように構成された磁気記録再生装置の回転
ドラム装置は、高速で回転駆動される上ドラム１
に設けられた給電部７により入力された鋸歯状高
電圧（数百ボルト）を圧電素子４に供給し、圧電
素子４の制御を行なうようになされている。
Conventionally, as this type of magnetic recording/reproducing apparatus, one shown in FIG. 2 has been known. In FIG. 2, numeral 1 designates an upper drum, which is supported by a rotating shaft 8 that is rotationally driven by a motor (not shown). The upper drum 1 also has a movable magnetic head 5 that moves in the axial direction.
are arranged via the piezoelectric element 4. Reference numeral 2 denotes a fixed drum, which regulates a helically wound magnetic tape (not shown) in a fixed position. 3
A rotary transformer is provided on the upper drum 1 and the fixed drum 2, and has a function of transmitting signals from the fixed magnetic head (not shown) and the movable magnetic head 5 provided on the upper drum 1 without contact. A brush part 6 is fixed to the fixed end and supplies a control signal (high voltage) to move the movable magnetic head 5 in the axial direction, and this control signal is transmitted to the power supply part 7 provided at the upper part of the upper drum 1. The movable magnetic head 5
is supplied to the piezoelectric element 4 of. The rotating drum device of the magnetic recording and reproducing device configured as described above includes an upper drum 1 that is driven to rotate at high speed.
The piezoelectric element 4 is controlled by supplying a sawtooth high voltage (several hundred volts) inputted by a power supply section 7 provided to the piezoelectric element 4 .
従来の磁気記録再生装置は以上のように構成さ
れているので、ブラシ部６と給電部７の接触状態
が経年並化により劣化し、ノイズや信号の伝達不
良等が発生しやすい欠点があつた。
この考案は上記した従来の欠点を除去するため
に成されたもので、その目的は可動磁気ヘツドを
変位させる圧電素子に供給される制御信号が経年
変化に対して安定して得られる磁気記録再生装置
を提供するものである。
Since the conventional magnetic recording/reproducing device is configured as described above, it has the disadvantage that the contact condition between the brush section 6 and the power supply section 7 deteriorates over time, and noise and signal transmission failure are likely to occur. . This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.The purpose of this invention is to provide a magnetic recording and reproducing device that allows the control signal supplied to the piezoelectric element that displaces the movable magnetic head to be obtained stably against changes over time. It provides equipment.
この考案は、かかる目的を達成するために、可
動磁気ヘツドを収納する回転ドラムの回転軸と、
回転軸の軸方向に沿つて内部に配設されたオプテ
イカルフアイバーと、回転ドラムに設けられ、オ
プテイカルフアイバーの端部付近に配設された受
光部と、受光部からの出力信号により制御され、
可動磁気ヘツドを可動する圧電素子に制御信号を
供給する駆動回路とを備えたことを特徴とするも
のである。
In order to achieve this purpose, this invention includes a rotating shaft of a rotating drum that houses a movable magnetic head;
It is controlled by an optical fiber disposed inside along the axial direction of the rotating shaft, a light receiving section provided on the rotating drum near the end of the optical fiber, and an output signal from the light receiving section. ,
The device is characterized in that it includes a drive circuit that supplies a control signal to a piezoelectric element that moves the movable magnetic head.
以下、この考案の一実施例を第１図に沿つて説
明する。第１図において従来例と同一符号は同一
部材を示し、その説明は省略する。第１図におい
て、９は回転軸８の軸方向に沿つて内部に配設さ
れたオプテイカルフアイバーであり、１０は上ド
ラムに設けられ、オプテイカルフアイバーの端部
付近に配設された受光駆動回路である。この受光
駆動回路１０はオプチカルフアイバー９よりの光
を受光して電気信号に変換する受光部と、この受
光部からの出力信号により制御され、可動磁気ヘ
ツド５の圧電素子４に制御信号を供給する駆動回
路から構成されている。また圧電素子４を駆動す
る電源は内部に設けられたバツテリーの電圧を高
電圧に変換することにより得られ、受光部よりの
出力信号により制御されている。１１はオプテイ
カルフアイバー９の他端に配設された発光部であ
り、変調器を含む制御回路１２よりの出力電圧に
より発光レベルを制御されている。
次にこの考案の作用について説明する。制御回
路１２により鋸歯状電圧を任意に変調された出力
電圧は発光部１１で変換される。発光部１１の光
は回転軸８の内部に設けられたオプテイカルフア
イバー９に伝達され上ドラム１の配設された受光
駆動回路１０に入射され、ここで受光部により光
−電気変換される。電気信号に変換された制御信
号はバツテリを電源とする高圧発生回路を制御
し、高圧制御信号を発生させる。高圧制御信号は
圧電素子４に供給されて可動磁気ヘツド５を可動
制御する。
An embodiment of this invention will be described below with reference to FIG. In FIG. 1, the same reference numerals as in the conventional example indicate the same members, and the explanation thereof will be omitted. In FIG. 1, 9 is an optical fiber disposed inside the rotating shaft 8 along the axial direction, and 10 is a light receiving drive provided on the upper drum and disposed near the end of the optical fiber. It is a circuit. The light receiving drive circuit 10 includes a light receiving section that receives light from the optical fiber 9 and converts it into an electrical signal, and is controlled by an output signal from the light receiving section and supplies a control signal to the piezoelectric element 4 of the movable magnetic head 5. It consists of a drive circuit. Further, the power source for driving the piezoelectric element 4 is obtained by converting the voltage of an internal battery to a high voltage, and is controlled by an output signal from a light receiving section. Reference numeral 11 denotes a light emitting section disposed at the other end of the optical fiber 9, whose light emitting level is controlled by an output voltage from a control circuit 12 including a modulator. Next, the effect of this invention will be explained. The output voltage obtained by arbitrarily modulating the sawtooth voltage by the control circuit 12 is converted by the light emitting section 11 . The light from the light emitting section 11 is transmitted to an optical fiber 9 provided inside the rotating shaft 8, and enters a light receiving drive circuit 10 provided on the upper drum 1, where it is optical-to-electrically converted by the light receiving section. The control signal converted into an electric signal controls a high voltage generation circuit whose power source is a battery, and generates a high voltage control signal. The high voltage control signal is supplied to the piezoelectric element 4 to control the movement of the movable magnetic head 5.
以上説明したように、この考案によれば、オプ
テイカルフアイバーを回転ドラムの回転軸に配設
するように構成したので、装置を小型、軽量にす
ることができ、また制御信号を光伝送してうるの
で経年変化のない安定した磁気記録再生装置を得
ることができる。
As explained above, according to this invention, since the optical fiber is arranged on the rotating shaft of the rotating drum, the device can be made smaller and lighter, and the control signal can be optically transmitted. Therefore, a stable magnetic recording/reproducing device that does not deteriorate over time can be obtained.
第１図はこの考案による磁気記録装置の一実施
例を示す要部断面図、第２図は従来の構成を示す
要部断面図である。
１……上ドラム、２……固定ドラム、４……圧
電素子、５……可動磁気ヘツド、８……回転軸、
９……オプテイカルフアイバー、１０……受光駆
動回路、１１……発光部、１２……制御回路。
FIG. 1 is a sectional view of a main part showing an embodiment of a magnetic recording device according to this invention, and FIG. 2 is a sectional view of a main part showing a conventional configuration. 1... Upper drum, 2... Fixed drum, 4... Piezoelectric element, 5... Movable magnetic head, 8... Rotating shaft,
9... Optical fiber, 10... Light receiving drive circuit, 11... Light emitting section, 12... Control circuit.
Claims (1)
内に有する磁気記録再生装置において、上記可動
磁気ヘツドを収納する上記回転ドラムの回転軸と
上記回転軸の軸方向に沿つて内部に配設されたオ
プチカルフアイバーと、上記回転ドラムに設けら
れ、上記オプチカルフアイバーの端部付近に配設
された受光部と、上記受光部からの出力信号によ
り制御され、上記可動磁気ヘツドを可動する圧電
素子に制御信号を供給する駆動回路とを備えたこ
とを特徴とする磁気記録再生装置。 A magnetic recording/reproducing device having a movable magnetic head movable in an axial direction within a rotating drum, the rotary drum housing the movable magnetic head having a rotating shaft and an optical disc disposed inside along the axial direction of the rotating shaft. a fiber, a light receiving section provided on the rotating drum and disposed near an end of the optical fiber, and a control signal that is controlled by an output signal from the light receiving section and sends a control signal to a piezoelectric element that moves the movable magnetic head. What is claimed is: 1. A magnetic recording/reproducing device comprising: a drive circuit for supplying the magnetic recording device;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6496385U JPH0351777Y2 (en) | 1985-04-30 | 1985-04-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6496385U JPH0351777Y2 (en) | 1985-04-30 | 1985-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61182919U JPS61182919U (en) | 1986-11-14 |
| JPH0351777Y2 true JPH0351777Y2 (en) | 1991-11-07 |
Family
ID=30596533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6496385U Expired JPH0351777Y2 (en) | 1985-04-30 | 1985-04-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0351777Y2 (en) |
-
1985
- 1985-04-30 JP JP6496385U patent/JPH0351777Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61182919U (en) | 1986-11-14 |
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