JPS60102070A - Head output switching circuit - Google Patents

Head output switching circuit

Info

Publication number
JPS60102070A
JPS60102070A JP58209088A JP20908883A JPS60102070A JP S60102070 A JPS60102070 A JP S60102070A JP 58209088 A JP58209088 A JP 58209088A JP 20908883 A JP20908883 A JP 20908883A JP S60102070 A JPS60102070 A JP S60102070A
Authority
JP
Japan
Prior art keywords
recording
switching
transistor
rotary transformer
playback
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
Application number
JP58209088A
Other languages
Japanese (ja)
Other versions
JPH0519873B2 (en
Inventor
Hiroshi Narita
成田 広
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP58209088A priority Critical patent/JPS60102070A/en
Publication of JPS60102070A publication Critical patent/JPS60102070A/en
Publication of JPH0519873B2 publication Critical patent/JPH0519873B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, 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
    • G11B15/02Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12Masking 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
    • G11B15/14Masking or switching periodically, e.g. of rotating heads

Landscapes

  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To attain power saving while decreasing the load of a recording amplifier and also to improve the recording and reproducing picture quality by inserting a transistor (TR) via a rotary transformer, conducting the TR at reproduction and breaking it at recording. CONSTITUTION:An HIGH voltage is fed to a base of TR32 at reproduction and TRs 30, 31, 32 are turned on. Thus, the emitter of a switching TR11 is grounded via the rotary transformer 5 in terms of AC and DC, and an output of a head 2 is fed by applying the HIGH voltage to a base (d). On the other hand, a LOW voltage is applied to a terminal (a) at recording and the TRs 30, 32 are turned off. Since the HIGH voltage is applied to terminals (b), (c), the load of the recording amplifier 25 is heads 1, 2 only, the power consumption is reduced and the frequency characteristic is also improved.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明はフィールドステイル、 77 インス0−など
特殊再生機能を有する磁気記録再生装置のへqド出刃切
換回路に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a head/q/do blade switching circuit for a magnetic recording/reproducing apparatus having a special reproduction function, such as a field staple or 77 ins0-.

〔発明の背景〕[Background of the invention]

ヘリカルスキャンV’FR[S”いて1通常の再生はア
ジ・マス角の異なる2個のへ9ドを用いて行なう。スチ
イル、ファインスロなど、特殊再生全行な9場合、通常
の2個のへづドでも可能であるが、スチイル画面か77
一ム単位となるため、高速で変化する絵の場合にゆnが
生じる欠点かあり、このため特殊再生用[1ないし2個
の別のヘッドを設けてフィールドスチイルファインスロ
ー機能を%*ぜた機種がある。
Helical scan V'FR[S''1 Normal playback is performed using two hems with different azimuth and mass angles.In the case of full line special playback such as steel and fine slot, the normal two hems are used. It is possible to use Hezudo, but still screen or 77
Because it is in units of 1 mm, there is a drawback that it may cause distortion when the picture changes at high speed. There are models available.

特殊再生機能としてはフイールドスチイル、ファインス
ローなどがあるが、ファインスローの場合、スチイルと
グレイを父互にに繰9返すために再生中にヘッド出刃の
切換を行なう必要がある。
Special playback functions include field steel and fine throw, but in the case of fine throw, it is necessary to switch the head blade during playback in order to repeat steel and gray alternately.

この出力の切換をロータリトラン7とプリアンプの間に
スイッチングトランジスタ41列に挿入して行なってい
た。このトランジスタi0Hさせるためにペース電流を
流す必要があり、このためスイ・ノチングトランジスタ
のエミーlり側にロータリートランスを介して血流的に
インダクタンスや抵抗が接続されていた。この場合、記
録時には上記インダクタンスや抵抗は記録アンプの負荷
となり記録電流の周波数特性の劣化及び記録効慕の劣化
が生じる。これの回路を第1図、第2図で説明する。へ
リドとしては通常再生へリド1,2、特殊再生へリド3
かめりへづド1とへリド3は同じアジマスである。ヘッ
ド2はへづド1,5と異なるアジマスとなっている。回
転シリンダ36上のへ+/ド取付は位置は第2図のよう
になって29.特殊再生へ・ノド3は通常再生へリド2
の近くの前あるいは彼に位置する。へづド1の出刃はロ
ータリトランス4’(l?介してフィードパづり型プリ
アンプ26に入力される。へづド2の出刃は通常再生時
スイッチングトランジスタ11がONするのでロータリ
トランス5を介してフィードバック型ブリアン727に
入力さ几る。へづド3出力は特殊再生時スイづチングト
ランジスタ12がONするのでロータリトランジスタ1
2がONするので口〜タリトランス6を介してフィード
バック型プリアンプ27に入力さnるので、特殊再生時
と通常再生時の切換は上記スイッチングトランジスタ1
1゜12のベースdueに”HI GH=電圧を印加さ
ぜることに−c’)OTMである。トランジスタスイッ
チ11゜12をONさせるためにはペース電流を流す必
要があり、このためスイッチングトランジスタ11のエ
ミ吋夕*Jにロータリトランス5を介してインダクタン
ス7あるいは抵抗13が接続されている。
This switching of the output was performed by inserting a switching transistor 41 column between the rotary transducer 7 and the preamplifier. In order to make this transistor i0H, it is necessary to flow a pace current, and for this reason, an inductance or a resistance is connected to the emitter side of the switching transistor via a rotary transformer in a blood flow manner. In this case, during recording, the inductance and resistance act as a load on the recording amplifier, causing deterioration of the frequency characteristics of the recording current and deterioration of recording efficiency. This circuit will be explained with reference to FIGS. 1 and 2. The helidos are normal playback helido 1 and 2, and special playback helido 3.
Kameri Hed 1 and Helid 3 have the same azimuth. The head 2 has a different azimuth from the heads 1 and 5. The position for attaching the +/do to the rotating cylinder 36 is as shown in Figure 2 at 29. Go to special playback/Nodo 3 go to normal playback/Nodo 2
to be located in front of or near him. The cutting edge of the head 1 is inputted to the feed pad preamplifier 26 through the rotary transformer 4' (l?).The cutting edge of the head 2 is fed back through the rotary transformer 5 since the switching transistor 11 is normally turned on during playback. The output is input to the Brian type 727.The output of the head 3 is the rotary transistor 1 because the switching transistor 12 is turned on during special playback.
2 is turned on, the input is input to the feedback type preamplifier 27 via the input to Taly transformer 6, so switching between special playback and normal playback is done by the switching transistor 1.
Applying a "HI GH=voltage to the base due of 1゜12 -c') OTM. In order to turn on the transistor switch 11゜12, it is necessary to flow a pace current, so the switching transistor An inductance 7 or a resistor 13 is connected to the resistor 11 via a rotary transformer 5.

スイッチングトランジスタ11.12がONの時の二ミ
づタコレクタ間のON抵抗はノイズ発生源となるので十
分小さくする必要があり、このためにはペース電流は数
mA流す必要がある。この条件を満足するためにはイン
ダクタンス7、抵抗13はあまり大きな値を使用するこ
とができない。
Since the ON resistance between the two collectors when the switching transistors 11 and 12 are ON becomes a source of noise, it is necessary to make it sufficiently small, and for this purpose, it is necessary to flow a pace current of several mA. In order to satisfy this condition, the inductance 7 and the resistance 13 cannot have very large values.

また抵抗15は記録時に2いてレベルの大きい記録電流
にエフ録再切換トランジスタ8が0N−fるのを防ぐた
め電源に接続ざnている。コンデンサ14.16はDC
的な結合を防いでいる。
Further, the resistor 15 is set to 2 during recording and is connected to the power source to prevent the recording/reproducing switching transistor 8 from turning ON-f due to the high level recording current. Capacitors 14 and 16 are DC
This prevents physical connections.

記録時には、録再切換トランジスタ9,1oがONにな
りロータリトランス4.5の一方は接地さn記録アン7
25の負荷はへリド1.2と前述したインダクタンス7
、あるいは抵抗13となる。このため以下の↓うな問題
が発生する。
During recording, the recording/reproducing switching transistors 9 and 1o are turned on, and one side of the rotary transformer 4.5 is grounded.
The load of 25 is the helide 1.2 and the inductance 7 mentioned above.
, or resistor 13. This causes the following problems.

1)記録電流の周波数特性が変化することによる録再画
質の劣化 2)記碌効藁の劣化による記録アンプ消費電力の増加 〔発明の目的〕 本発明の目的は、上述した欠点をなくし、特殊再生機能
を持つ磁気記録再生装置において、画質の同上及び消費
電力を減少させるへリド出刃切換回路提供することにあ
る。
1) Deterioration of recording and reproducing image quality due to change in frequency characteristics of recording current 2) Increase in power consumption of recording amplifier due to deterioration of recording efficiency [Object of the Invention] An object of the present invention is to provide a helical blade switching circuit that improves image quality and reduces power consumption in a magnetic recording and reproducing device having a reproducing function.

〔発明の概要〕[Summary of the invention]

上記目的を達成するため1本発明では、再生時ロータリ
トランスとフィードバック型プリアンプ(DflJK山
夕IJJC挿入さnたスイッチングトランジスタのペー
ス電流の径路をつくるため、ロータリトランスをヅrし
て接続これたインダクタンスや抵抗の代わ9にトランジ
スタを挿入し、記録時にはこノトランシスタをOF’F
することにエフ記録アンプの負荷を軽減することによる
省電力、また記録電流の周波数特性の改善による録再画
質の同上を行なうものである。
In order to achieve the above object, the present invention uses an inductance connected to the rotary transformer to create a path for the pace current of the switching transistor between the rotary transformer and the feedback preamplifier (DflJK Sanyu IJJC inserted) during playback. Insert a transistor into 9 instead of a resistor, and turn this transistor off when recording.
In particular, it saves power by reducing the load on the F recording amplifier, and improves recording and reproducing image quality by improving the frequency characteristics of the recording current.

〔発明の実施例〕[Embodiments of the invention]

以下本発明第3図に示す実施例に基き説明丁−再生時は
トランジスタ32のペースa VC“HIGH=電圧が
印加されトランジスタ32はONすると同時にトランジ
スタ5 ’0 、31もONする。このためスイッチン
グトランジスタ11のエミ呼夕はロータリトランス5を
介して直流的にも交流的に接地される。この几め通常再
生時はスイ呼チングトランジスタ110ペースdに@H
IGH’電圧が印刀口されることに19.スイッチング
トランジスタ11はONl、、へリド2の出力はフィー
ドパ噌り型1リアン127に刃口えら几る。、フィール
ドスチルの工りな特殊再生時にはスイッチングトランジ
スタ12のベースeVC″H工aH’!圧が印加され、
スイづチングトランジスタ12はONして、ヘッド3出
力はフィードパ噌り型プリアンプ27に人力される、フ
ァインスローの時は、プレイ時にはd1スチル時にはe
tc−HIGH”電圧か印刀口されへリド2.3出力の
切換えかで′Pる、記録時には端子aには”LOW”電
圧が印加されトランジスタ30.31.32はOFFと
なる。ま友端子fint3には″″HIGH’HIGH
’電圧ので記録アンプ25の負荷はへリド1,2だけと
な9、前述した消費電力の増力口及び周波数特性が変化
することによる録再画質の劣化という問題は対策される
。また本発明ではトランジスタ30.31.32は従来
の回路の録再切換トランジスタ、8の働きもしている。
The following is an explanation based on the embodiment of the present invention shown in FIG. 3. During playback, the pace aVC"HIGH=voltage of the transistor 32 is applied, and the transistor 32 is turned on, and at the same time, the transistors 5'0 and 31 are also turned on. Therefore, the switching The emitter of the transistor 11 is grounded via the rotary transformer 5 in both DC and AC directions.
19. The IGH' voltage is applied. The switching transistor 11 is ON1, and the output of the helide 2 is sent to the feeder type 1 transistor 127. , during special playback of field stills, a pressure is applied to the base eVC of the switching transistor 12.
The switching transistor 12 is turned on, and the head 3 output is manually powered by the feed-pastor type preamplifier 27. During fine throw, during play, during d1 still, e
tc-HIGH" voltage or the switching of the stamp output and the helide 2.3 output. During recording, a "LOW" voltage is applied to terminal a and transistors 30, 31, and 32 are turned off. fint3 has ``''HIGH'HIGH
Since the voltage is low, the load on the recording amplifier 25 is only on the helides 1 and 2.9 The above-mentioned problem of deterioration of recording and reproducing image quality due to changes in power consumption and frequency characteristics can be solved. In the present invention, transistors 30, 31, and 32 also function as the recording/reproducing switching transistor 8 of the conventional circuit.

トランジスタ30のドライバ用としてPNPトランジス
タ31を使用するのは記録電流の2次高調波歪の発生を
防止するためである。
The reason why the PNP transistor 31 is used as a driver for the transistor 30 is to prevent generation of second harmonic distortion of the recording current.

コンデンサ16は厘流力ヴト用である。The capacitor 16 is for low current power.

〔発明の効果〕〔Effect of the invention〕

以上述べた工うに本発明によれば、再生時に通常再生用
ヘプト出力と特殊再生用ヘプト出力の切換ヲロータリト
ランスとプリアンプの間に挿入さn7’(スイッチング
トランジスタにより行ない、上記トランジスタの直流ベ
ース電流を流す径路を作るためスイッチングトランジス
タのエミヴタにロータリトランスを介して直列に接続さ
几る。抵抗やインダクタンスをスイッチング素子におき
換えることができる。このため記録状態ではスイッチ素
子をOFFにすることができるので記録アンプの負荷が
軽くなり、消費電力の減少、及び記録電流の周波数特性
の改善による画質向上の効果がある。
As described above, according to the present invention, switching between the HEP output for normal reproduction and the HEP output for special reproduction during playback is performed by a switching transistor n7' (switching transistor) inserted between the rotary transformer and the preamplifier, and the DC base current of the transistor is It is connected in series to the emitter of the switching transistor via a rotary transformer in order to create a path for the flow of .Resistance and inductance can be replaced with a switching element.For this reason, the switching element can be turned off in the recording state. This reduces the load on the recording amplifier, reduces power consumption, and improves the image quality by improving the frequency characteristics of the recording current.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来のヘプト出力切換回路の回路図。 第2図は通常再生及び特殊再生を行なうヘプトのシリン
ダ実装図、第6図は本発明のへリド出刃切換回路の回路
図である。 1.2・・・通常再生へ9F、3・・・特殊再生へリド
、4 +5 +6・・・ロータリトランス、11.12
・・・通常再生、特殊再生切換用スイッチングトランジ
スタ、8.9.10.30.51.32・・・録再切換
用スイッチングトランジスタ、25・・・記録アンプ、
26゜27・・・フィードパ噌り型プリアンプ。 オ ) r;?1 第3図
FIG. 1 is a circuit diagram of a conventional hepto output switching circuit. FIG. 2 is a mounting diagram of a hept cylinder that performs normal regeneration and special regeneration, and FIG. 6 is a circuit diagram of a helide blade switching circuit according to the present invention. 1.2...9F to normal playback, 3...Limit to special playback, 4 +5 +6...Rotary transformer, 11.12
... Switching transistor for normal playback and special playback switching, 8.9.10.30.51.32... Switching transistor for recording/reproduction switching, 25... Recording amplifier,
26゜27...Feed pad type preamplifier. o ) r;? 1 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 少なくとも通常再生用の2個のへづドと特殊再生用の1
個のへラドを有し、通常再生用へづド出力と特殊再生用
へづド出力の切換をロータリトランスと前置増幅器の間
に挿入さnたスイッチングトランジスタにより行なう磁
気記録再生装置において、スイづチングトランジスタの
エミヴタにロータリトランスを介して直列にDC結合し
て接地され、記録時には遮断し、再生時には導通するス
イッチング素子を設けたことを特徴とするへ・ラド出力
切換回路。
At least two heads for normal playback and one for special playback.
In a magnetic recording/reproducing device, the switching transistor is inserted between a rotary transformer and a preamplifier to switch between a head output for normal reproduction and a head output for special reproduction. A switching circuit is provided with a switching element which is DC-coupled in series to the emitter of a switching transistor and grounded via a rotary transformer, and which is cut off during recording and conductive during playback.
JP58209088A 1983-11-09 1983-11-09 Head output switching circuit Granted JPS60102070A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58209088A JPS60102070A (en) 1983-11-09 1983-11-09 Head output switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58209088A JPS60102070A (en) 1983-11-09 1983-11-09 Head output switching circuit

Publications (2)

Publication Number Publication Date
JPS60102070A true JPS60102070A (en) 1985-06-06
JPH0519873B2 JPH0519873B2 (en) 1993-03-17

Family

ID=16567073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58209088A Granted JPS60102070A (en) 1983-11-09 1983-11-09 Head output switching circuit

Country Status (1)

Country Link
JP (1) JPS60102070A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4955020U (en) * 1972-08-22 1974-05-15
JPS57140086A (en) * 1981-02-23 1982-08-30 Hitachi Ltd Recording and reproducing circuit for vtr

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4955020U (en) * 1972-08-22 1974-05-15
JPS57140086A (en) * 1981-02-23 1982-08-30 Hitachi Ltd Recording and reproducing circuit for vtr

Also Published As

Publication number Publication date
JPH0519873B2 (en) 1993-03-17

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