JPS6228907A - Head for video signal recording and reproduction - Google Patents
Head for video signal recording and reproductionInfo
- Publication number
- JPS6228907A JPS6228907A JP16836485A JP16836485A JPS6228907A JP S6228907 A JPS6228907 A JP S6228907A JP 16836485 A JP16836485 A JP 16836485A JP 16836485 A JP16836485 A JP 16836485A JP S6228907 A JPS6228907 A JP S6228907A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- winding
- head
- reproducing
- reproduction
- 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
- 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
- G11B15/125—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 conditioned by the operating function of the apparatus
Landscapes
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は磁気テープ、磁気ディスク等の磁気記録媒体に
映像信号を記録し若しくは該磁気記録媒体に記録されて
いる映像信号を再生する磁気記録再生装置の映像信号記
録再生用ヘッドに関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing method for recording a video signal on a magnetic recording medium such as a magnetic tape or a magnetic disk, or reproducing a video signal recorded on the magnetic recording medium. The present invention relates to a head for recording and reproducing video signals of a device.
従来の映像信号記録再生用ヘッドは第５図に示すように
コアＩＯＡ、ＩＯＢに巻回された巻線１２を記録時若し
くは再生時にスイッチｓ、ｗ、、ｓＷ２によりそれぞれ
記録用増幅器１４、若しくは再生用増幅器１６に切り換
えるように構成されていた。As shown in FIG. 5, the conventional head for recording and reproducing video signals is configured to connect the windings 12 wound around the cores IOA and IOB to the recording amplifier 14 or the reproducing amplifier by switches s, w, and sW2 during recording or reproducing, respectively. It was configured to switch to an amplifier 16 for use.
すなわち、従来の（〃気記録再生装置では磁気記録媒体
に映像信号の記録、再生を行うに際し、単一のヘッドで
、しかも同一の巻線を単に、記録系と再生系に切り換え
為ようにしていた。このように単一の巻線を記録時及び
再生時に共用するタイプの映面“信号記録再生用ヘッド
ではコアに巻回された巻線の巻数を記録時に適合するよ
うに選定すると、再生系の入力信号とじての映像信号を
必要なレベルで再生することが出来ず、Ｓ／Ｎが低下し
、またヘッドの巻線の巻数を再生時に適合するように選
定すると、記録電圧を高くしなければならないという問
題があった。In other words, in conventional magnetic recording and reproducing devices, when recording and reproducing video signals on a magnetic recording medium, a single head and the same winding are simply switched between the recording system and the reproducing system. In this type of video signal recording/playback head in which a single winding is used both during recording and playback, if the number of turns of the winding wound around the core is selected to match the recording time, the playback If the video signal, which is the input signal to the system, cannot be reproduced at the required level, the S/N ratio will drop, and if the number of turns of the head winding is selected to match the reproduction, the recording voltage will be increased. There was a problem that it had to be done.
そこでヘッドを記録用と再生用とで別設することも考え
られるが、コストが上界するという欠点がある。Therefore, it is conceivable to provide separate heads for recording and reproduction, but this has the drawback of increasing costs.
本発明はこのような事情に鑑みてなされたもので、記録
時に磁気記録媒体に低電圧で映像信号を記録し且つ再生
時に磁気記録媒体より高電圧の映像信号を得ることがで
きる映像信号記録再生用ヘッドを提供することを目的と
している。The present invention has been made in view of the above circumstances, and provides a video signal recording/reproducing method that can record a video signal at a low voltage on a magnetic recording medium during recording and obtain a high voltage video signal from the magnetic recording medium during playback. The purpose is to provide a head for
本発明は前記目的を達成する為に、磁気記録媒体に映像
信号を記録し、若しくは該磁気記録媒体に記録されてい
る映像信号を再生する磁気記録再生装置の映像信号記録
再生用ヘッドにおいて、該ヘッドを構成するコアに巻回
された巻線にタップを設け、記録時と再生時とでタップ
を切り換えることにより記録系若しくは再生系に接続さ
れるヘッドの巻線の巻数を変更可能に構成したことを特
徴とするものである。In order to achieve the above object, the present invention provides a video signal recording and reproducing head of a magnetic recording and reproducing apparatus that records video signals on a magnetic recording medium or reproduces video signals recorded on the magnetic recording medium. A tap is provided on the winding wound around the core constituting the head, and by switching the tap between recording and playback, the number of turns of the head winding connected to the recording system or the playback system can be changed. It is characterized by this.
以下、添付図面に従って本発明に係る映像信号記録再生
用へノドの好ましい実施例について詳説する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a video signal recording and reproducing throat according to the present invention will be described in detail below with reference to the accompanying drawings.
第１図には本発明に係る映像信号記録再生用ヘッドの一
実施例の構成が示されている。同図においてコアＩＯＡ
、ＩＯＢには巻線Ｌ１、Ｌ２が重ねられて巻回されてお
り、巻線り、の一端ＴｏはスイッチＳＷｌを介して接地
されるか若しくは記録用増幅器１４の出力端に接続可能
に構成されている。巻線Ｌ１の他端Ｔ１はスイッチＳＷ
２を介して接地されるか若しくは巻線Ｌ２の端子Ｔ２に
接続可能に構成されている。FIG. 1 shows the structure of an embodiment of a video signal recording/reproducing head according to the present invention. In the same figure, core IOA
, IOB has windings L1 and L2 wound on top of each other, and one end To of the winding is configured to be grounded via a switch SWl or connectable to the output end of the recording amplifier 14. ing. The other end T1 of the winding L1 is a switch SW
2 or connectable to the terminal T2 of the winding L2.
また巻線Ｌ２の端子Ｔ３は再生用増幅器１６の入力端に
接続されている。スイッチｓｗ、、ｓｗ２は連動するス
イッチであり、磁気記録再生装置における操作部の記録
用ボタンまたは再生用ボタン〈図示せず）を操作するご
とにより作動するスイッチである。巻線Ｌ＋ 、Ｌ２は
同一の線材が使用され、これらの巻線の巻数は重ね巻き
の為に当然、同一である。Further, the terminal T3 of the winding L2 is connected to the input end of the reproducing amplifier 16. The switches sw, , sw2 are interlocking switches that are activated each time a recording button or a reproducing button (not shown) of the operating section of the magnetic recording/reproducing device is operated. The same wire material is used for the windings L+ and L2, and the number of turns of these windings is naturally the same because they are overlapped.
尚、第１図及び第２図に於いてコアＩＯＡ、１ＯＢ内に
於ける矢印は磁化の方向を示している。Note that in FIGS. 1 and 2, the arrows in the cores IOA and 1OB indicate the direction of magnetization.
第１Ｍに示した映像信号記録再生用ヘッド２０の等価回
路を第３図に示す。同図において記録時に磁気記録再生
装置の操作部にお＋３る記録用ボタンを操作すると、ス
イッチｓｗ、−ｓｗ、は接点ＲＥＣ側に切り換えられ、
記録用増幅器１４の出力側には巻きｖＡＬｌのみが負荷
として接続されるまた再生時に再生用ボタンを操作する
と、スイッチｓｗ、 、ｓｗ２は接点ＰＢ側に切り換え
られ、再生用増幅器１６の入力側には巻線Ｌｌ、Ｌ２の
直列回路が接続される。FIG. 3 shows an equivalent circuit of the video signal recording/reproducing head 20 shown in No. 1M. In the same figure, when the recording button +3 on the operation unit of the magnetic recording and reproducing device is operated during recording, the switches sw and -sw are switched to the contact REC side,
Only the winding vALl is connected as a load to the output side of the recording amplifier 14. Also, when the playback button is operated during playback, the switches sw, , sw2 are switched to the contact PB side, and the input side of the playback amplifier 16 is connected to the input side of the playback amplifier 16. A series circuit of windings Ll and L2 is connected.
このように本実施例ではタップの切り換えにより記録時
には巻き線Ｌ１のみが、また再生時には巻線Ｌ１とＬ２
の直列回路がヘッド２０のインピーダンスとして作用す
る。従って、記録時におけるヘッド２０のインピーダン
スは再生時に比して１／２となり、ヘッド２０の記録電
流を２倍、流すことができるので記録電圧は１／２で済
む。また再生時にはヘッド２０のインピーダンスを記録
時における２倍に変更することができるので２倍の再生
出力が得られる。In this embodiment, by switching the taps, only the winding L1 is used during recording, and the windings L1 and L2 are used during playback.
The series circuit acts as an impedance for the head 20. Therefore, the impedance of the head 20 during recording is 1/2 of that during reproduction, and since the recording current of the head 20 can be twice as much as that during reproduction, the recording voltage can be reduced to 1/2. Further, during reproduction, the impedance of the head 20 can be changed to twice that during recording, so that twice the reproduction output can be obtained.
本発明の他の実施例を第２図に示す。同図においてコア
ＩＯＡ、ＩＯＢにはそれぞれ巻線Ｌ ｌｏ−。Another embodiment of the invention is shown in FIG. In the figure, cores IOA and IOB each have a winding L lo-.
Ｌ２０が巻回されており、巻線Ｌ１゜の一端Ｔ。は接地
され、他端Ｔ１はスイッチＳＷ３を介して巻線Ｌｚｏの
端子Ｔ２若しくは記録用増幅器１４の出力端に接続可能
に構成されている。L20 is wound, and one end of the winding L1° is T. is grounded, and the other end T1 is configured to be connectable to the terminal T2 of the winding Lzo or the output end of the recording amplifier 14 via a switch SW3.
また巻線Ｌ２０の一端Ｔ３は再生用増幅器１６の入力端
に接続されている。巻線Ｌ＋ｏは記録時に適合するイン
ピーダンスとなる、ように巻数が選定され、巻ｖＡＬ
＋ ｏ、Ｌ ｚ。が直列接続されたときの合成インピー
ダンスが再生時に適合するインピーダンスとなるように
巻線Ｌ２゜の巻数が選定されているものとする。Further, one end T3 of the winding L20 is connected to the input end of the regenerative amplifier 16. The number of turns of the winding L+o is selected so that it has an impedance suitable for recording, and the winding vAL
+ o, Lz. It is assumed that the number of turns of the winding L2° is selected so that the composite impedance when the two are connected in series becomes an impedance suitable for reproduction.
第２図に示した映像信号記録再生用ヘッドの等価回路を
第４図に示す。同図において記録時に磁気記録再生装置
の操作部の記録用ボタン（図示せず）を操作すると、ス
イッチＳ Ｗ ３が接点ＲＥＣ側に切り換えられ、記録
用増幅器１４の出力端にヘッド２０の巻線ＬＩＯが負荷
として接続されてることとなる。FIG. 4 shows an equivalent circuit of the video signal recording/reproducing head shown in FIG. 2. In the figure, when a recording button (not shown) on the operating section of the magnetic recording/reproducing device is operated during recording, the switch SW 3 is switched to the contact REC side, and the winding of the head 20 is connected to the output end of the recording amplifier 14. This means that LIO is connected as a load.
また再生時には再生用ボタンを操作することによりスイ
ッチＳＷ、は接点ＰＢ側に切り換えられ、再生用増幅器
１６の入力端には巻線Ｌ１いＬ２０の直列回路が接続さ
れる。During reproduction, the switch SW is switched to the contact PB side by operating the reproduction button, and the series circuit of windings L1 to L20 is connected to the input terminal of the reproduction amplifier 16.
このようにして本実施例では巻線Ｌ１゜、Ｌ２゜の巻数
を個別に選定することができるので、本実施例によれば
記録時及び再生時の双方に適合するようにヘッドのイン
ピーダンスを決定することができる。従って理想に近い
記録、再生を行うことができる。In this way, in this embodiment, the number of turns of the windings L1° and L2° can be selected individually, so according to this embodiment, the impedance of the head is determined to be suitable for both recording and playback. can do. Therefore, near-ideal recording and reproduction can be performed.
以上に説明したように本発明では映像信号記録再生用ヘ
ッドにおいて、該ヘッドを構成するコアに巻回された巻
線にタップを設け、記録時と再生時とでタップを切り換
えることにより記録系若しくは再生系に接続されるヘッ
ドの巻線の巻数を変更できるように構成したので、本発
明によれば記録時、再生時の双方に適合するようにヘッ
ドの巻線の巻数、すなわちインピーダンスを設定するこ
とができる。As explained above, in the present invention, in the head for recording and reproducing video signals, a tap is provided in the winding wound around the core constituting the head, and by switching the tap between recording and reproduction, the recording system or Since the structure is configured such that the number of turns of the head winding connected to the reproduction system can be changed, according to the present invention, the number of turns of the head winding, that is, the impedance, can be set to suit both recording and reproduction. be able to.
従って記録時に磁気記録媒体に低電圧で映像信号を記録
し且つ再生時に該磁気記録媒体から高電圧の映像信号を
得ることができる。Therefore, a video signal can be recorded at a low voltage on a magnetic recording medium during recording, and a high voltage video signal can be obtained from the magnetic recording medium during reproduction.
第１図は本発明に係る映像信号記録再生用ヘッドの一実
施例を示す回路図、第２図は本発明の他の実施例を示す
回路図、第３図は第１図に示した回路の等価回路を示す
回路図、第４図は第２図に示した回路の等価回路を示す
回路図、第５図は従来の映像信号記録再生用ヘッドを示
す回路図である。
１０Ａ、ＩＯＢ・・・コア、 １４・・・記録用増幅器
、 １６・・・再生用増幅器、 ２０・・・ヘッド、
Ｌ＋ 、Ｌｚ 、Ｌ＋。、Ｌ２゜・・・巻線、 ｓｗ、
、ｓｗ２、ｓｗ３・・・スイッチ。FIG. 1 is a circuit diagram showing one embodiment of the video signal recording/reproducing head according to the present invention, FIG. 2 is a circuit diagram showing another embodiment of the present invention, and FIG. 3 is the circuit shown in FIG. 1. 4 is a circuit diagram showing an equivalent circuit of the circuit shown in FIG. 2, and FIG. 5 is a circuit diagram showing a conventional video signal recording/reproducing head. 10A, IOB...core, 14...recording amplifier, 16...playback amplifier, 20...head,
L+, Lz, L+. , L2゜... winding, sw,
, sw2, sw3...switch.
Claims (1)
体に記録されている映像信号を再生する磁気記録再生装
置の映像信号記録再生用ヘッドにおいて、該ヘッドを構
成するコアに巻回された巻線にタップを設け、記録時と
再生時とでタップを切り換えることにより記録系若しく
は再生系に接続されるヘッドの巻線の巻数を変更可能に
構成したことを特徴とする映像信号記録再生用ヘッド。In a video signal recording and reproducing head of a magnetic recording and reproducing device that records video signals on a magnetic recording medium or reproduces video signals recorded on the magnetic recording medium, a winding wound around a core that constitutes the head. 1. A head for recording and reproducing video signals, characterized in that the number of windings of the head connected to a recording system or a reproducing system can be changed by providing a tap in the head and switching the tap between recording and reproducing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16836485A JPS6228907A (en) | 1985-07-30 | 1985-07-30 | Head for video signal recording and reproduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16836485A JPS6228907A (en) | 1985-07-30 | 1985-07-30 | Head for video signal recording and reproduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6228907A true JPS6228907A (en) | 1987-02-06 |
Family
ID=15866712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16836485A Pending JPS6228907A (en) | 1985-07-30 | 1985-07-30 | Head for video signal recording and reproduction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6228907A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63157804U (en) * | 1987-04-03 | 1988-10-17 |
-
1985
- 1985-07-30 JP JP16836485A patent/JPS6228907A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63157804U (en) * | 1987-04-03 | 1988-10-17 |
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