JPS5914121A - Magnetic head for detecting of head clogging - Google Patents

Magnetic head for detecting of head clogging

Info

Publication number
JPS5914121A
JPS5914121A JP12381482A JP12381482A JPS5914121A JP S5914121 A JPS5914121 A JP S5914121A JP 12381482 A JP12381482 A JP 12381482A JP 12381482 A JP12381482 A JP 12381482A JP S5914121 A JPS5914121 A JP S5914121A
Authority
JP
Japan
Prior art keywords
head
video
magnetic
azimuth
housing
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
Application number
JP12381482A
Other languages
Japanese (ja)
Inventor
Ryuji Nishiyama
西山 龍二
Yoshiji Nakagawa
祥次 中川
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12381482A priority Critical patent/JPS5914121A/en
Publication of JPS5914121A publication Critical patent/JPS5914121A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36Monitoring, i.e. supervising the progress of recording or reproducing
    • 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
    • G11B15/05Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/087Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals

Landscapes

  • Magnetic Heads (AREA)

Abstract

PURPOSE:To detect accurately a lost part of video signals, by applying winding to a head chip having an azimuth angle equal to the gap azimuth angle of a video track on a magnetic tape. CONSTITUTION:The video signal recorded on a magnetic tape 10 traveling toward an arrow mark is reproduced by a fixed magnetic head 8 having an azimuth angle equal to the azimuth of a magnetized pattern 11. The pattern 11 on the tape 10 has a gap azimuth theta1 and track width W1. The head 8 is connected with a yoke 15 containing a winding 14 with a terminal 13 wound around a head chip 12 having an azimuth theta1 (equal to the gap azimuth) and then put into a housing 16 which serves also as a shielding case. In such a way, the lost part of video signals can be detected accurately. This head ensures accurate detection of clogging of the video head.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、ヘリカルスキャン式ビデオテープレコーダに
おけるビデオヘッドの目づまりを検出する磁気ヘッドに
関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head for detecting clogging of a video head in a helical scan video tape recorder.

従来例の構成とその問題点 従来のヘリカルスキャン式ビデオテープレコーダについ
て第1図及び第2図を用いて説明する。
Structure of a conventional example and its problems A conventional helical scan type video tape recorder will be explained with reference to FIGS. 1 and 2.

ディスク(1)上に、実際にビデオ信号を記録するビデ
オヘッド(2) (:l)と、これら各ビデオヘッド(
2) (3) fこ追従して回転する、目づまり検出用
ヘッド(JJ i5)とが設置されており、ディスク(
1)の回転及びテープ(6)の走行に伴ない、ビデオヘ
ッド(2)で記録したノfターン上を、目づまり検出用
ヘッド(4)が走査し再生することにより、記録の良否
をモニターする。
On the disk (1), there is a video head (2) (:l) that actually records the video signal, and each of these video heads (
2) (3) A clogging detection head (JJ i5) that rotates following f is installed, and the disk (
As the tape (6) rotates and the tape (6) runs, the clogging detection head (4) scans and reproduces the no.f turn recorded by the video head (2), thereby monitoring the quality of the recording. do.

同様にビデオヘッド(3)で記録したパターン上を目づ
まり検出用ヘッド(5)が走査してモニターする。
Similarly, the clogging detection head (5) scans and monitors the pattern recorded by the video head (3).

すなわち、第2図の磁化パターンで説明すると、ビデオ
ヘッド(2)で記録されたパターン(7)の上を、ビデ
オヘッド(2)との間隔に応じて高さ補正された目づま
り検出用ヘッド(4ンが同軌跡を走査し再生する。しか
しながらこのような方式では、実際にビデオ信号を記録
するビデオヘッド(2) (3)と目づまり検出用ヘッ
ド(4) (5)とが近接しているため、目づまり検出
用ヘッド(4) (5)がテープ(6)上の信号を再生
するのみならず、ビデオヘッドf2) (3)の記録信
号を磁気結合によって直接ひろってしまい、テープ(6
)上のパターン(7)Iこ欠損部がある場合1こ、その
欠損部を正確に検出することができず、ビデオヘッド(
2)(3)の目づまりを確実fこ検出することかできな
いという問題があった。
That is, to explain using the magnetization pattern shown in FIG. 2, a clogging detection head whose height is corrected according to the distance from the video head (2) moves over the pattern (7) recorded by the video head (2). (The four heads scan and reproduce the same trajectory. However, in this type of system, the video head (2) (3) that actually records the video signal and the head (4) (5) for clogging detection are close to each other. Therefore, the clogging detection head (4) (5) not only reproduces the signal on the tape (6), but also directly picks up the recording signal of the video head f2) (3) by magnetic coupling, causing the tape (6
) If there is a defective part in pattern (7)I, the defective part cannot be detected accurately and the video head (
2) There is a problem in that it is only possible to reliably detect the clogging in (3).

発明の目的 本発明は上記従来の欠点を解消するもので、ビデオヘッ
ド(こまり記録されたビデオ信号の欠損部を正確に検出
できるヘッド目づまり検出用磁気ヘッドを得ることを目
的とする。
OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a video head (a magnetic head for head clogging detection that can accurately detect defective portions of a video signal recorded in fragments).

発明の構成 上記目的を達するため、本発明のヘッド目づまり検出用
磁気ヘッドは、ヘリカルスキャン式ヒテオテープレコー
ダtこより記録された磁気テープ上fこおけるビデオト
ラックのギャップアジマス角に等しいアジマス角を封す
るヘッドチップに巻線を施し、これをハウジングに収容
した構成である。
SUMMARY OF THE INVENTION In order to achieve the above object, the magnetic head for head clogging detection of the present invention seals an azimuth angle equal to the gap azimuth angle of a video track f on a magnetic tape recorded by a helical scan type HD tape recorder. The head chip is wound with a wire and housed in a housing.

実施例の説明 以下、本発明の一実施例1こついて、図面に基づいて説
明する、。
DESCRIPTION OF EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described based on the drawings.

第8図裔こおいて、(8)はへラドギャップ(9)を有
するヘッド目づまり検出用磁気ヘッド(以下磁気ヘッド
と称す)、αQは磁気テープ、0υは磁気テープOQに
記録されたビテ゛オ信号の磁化パターンであり、このよ
うζこ、矢印方向に走行する磁気テープQ0に記録され
たビデオ信号を磁化パターンQυのアジマスと等しいア
ジマスを有する固定の磁気ヘッド(8)により再生する
のである。FJσ記磁気テープQO上の磁化パターン(
ロ)は、第4図のまうに、ギャップアジマスθ1で、ト
ラック幅W1である。HITi己1鐘気ヘッド(8)は
、第5図のように、目a記ギャップアジマスθ1と等し
いアジマス記録を有するヘッドチップ@(こ、端子0付
きの巻線Q◆が巻回されたヨークに)を接合し、シール
ドケースを兼ねたハウジングα呻に収容したものである
。=V記ヘッドチップ(ロ)のトラック幅W、は磁気テ
ープOQ上のトラック幅W1に概略等しくする必要があ
るため、現在のVTRにおいては20〜’IOItm程
度となり、強度的に弱く、クラックやカケ等が発生する
。そこで、第6図のように、ヘッドチップQ7)をガラ
ス補強タイプ、すなわちギャップに)付近をガラス四で
補強したものにすることにより、ヘッドチップQカの厚
さを数百μmにすることが可能となり、製作が容易とな
る。
In Fig. 8, (8) is a head clogging detection magnetic head (hereinafter referred to as magnetic head) having a spacing gap (9), αQ is a magnetic tape, and 0υ is a video recorded on the magnetic tape OQ. This is the magnetization pattern of the signal, and the video signal recorded on the magnetic tape Q0 traveling in the direction of the arrow ζ is reproduced by a fixed magnetic head (8) having an azimuth equal to the azimuth of the magnetization pattern Qυ. Magnetization pattern on FJσ magnetic tape QO (
B) is the gap azimuth θ1 and the track width W1 as shown in FIG. As shown in Fig. 5, the HITi self-adjustable head (8) has a head chip @ (here, a yoke around which a winding Q ) and housed in a housing that also serves as a shield case. = The track width W of the head chip (b) in V must be approximately equal to the track width W1 on the magnetic tape OQ, so in current VTRs it is about 20~'IOItm, which is weak in strength and prone to cracks. Chips, etc. occur. Therefore, as shown in Fig. 6, by making the head chip Q7) a glass-reinforced type, that is, by reinforcing the area near the gap with glass, the thickness of the head chip Q7 can be made several hundred μm. possible and easy to manufacture.

第7図は別の実施例を示しており、この例では、ヘッド
チップに)の厚さ方向両端面に耐摩耗性の大きな非磁性
ブロックeυを接合し、これをハウジングに)内に収容
している。この場行、耐摩耗性が向上する。またシール
ド効果は若干低下するが、従来の回転式目づまり検出ヘ
ッドlこ比べ、設置場所をビデオヘッドから大きく離す
ことができるため、ビデオヘッドから記録信号を直接読
み取ることはない。
FIG. 7 shows another embodiment, in which a wear-resistant large non-magnetic block eυ is bonded to both end faces in the thickness direction of the head chip (), and this is housed in the housing (). ing. In this case, wear resistance improves. In addition, although the shielding effect is slightly reduced, compared to the conventional rotary clogging detection head, the installation location can be far away from the video head, so recording signals are not directly read from the video head.

第8図及び第9図はさらに別の実施例を示しており、第
8図において、峙は磁気テープ、(24a)(24b)
は一対のアジマス付きビデオヘッドにより記録された磁
化パターンであり、θ2.θ、はそれぞれ磁化パターン
(24a )(24b)のギャップアジマスである。
8 and 9 show still another embodiment, in FIG. 8, magnetic tape, (24a), (24b)
is a magnetization pattern recorded by a pair of azimuthal video heads, and θ2. θ is the gap azimuth of the magnetization patterns (24a) and (24b), respectively.

この例では、第9図のように、磁化パターン(24a 
)のギャップアジマスθ2と等しいギャップアジマスを
有するヘッドチップ(25a)と、磁化パターン(24
b)のギャップアジマスv3と等しいギャップアジマス
を有するヘッドチップ(25b)とを、非磁性材からな
るスペーサ□□□を介してシールドブロックに)と鼠合
し、ハウジング(ハ)に収容した構成である。この構成
によると、一対のビデオヘッドによりアジマス記録され
たビデオ信号の欠損部を検出することができる。
In this example, as shown in FIG. 9, the magnetization pattern (24a
) and a head chip (25a) having a gap azimuth equal to the gap azimuth θ2 of
A head chip (25b) having a gap azimuth equal to the gap azimuth v3 in b) is fitted with a shield block (via a spacer □□□ made of a non-magnetic material) and housed in a housing (c). be. According to this configuration, it is possible to detect a missing portion of a video signal recorded azimuthally by a pair of video heads.

なお上記各実施例において、ハウジングμQに)に)の
材料とし′C1高透磁率性材料を用いれば、まり正確に
ビデオヘッドの目づまりを検出することができる。
In each of the above embodiments, clogging of the video head can be detected more accurately by using the high magnetic permeability material 'C1 as the material for the housing μQ.

また本発明にかかるヘッド目づまり検出用磁気ヘッドは
、固定ヘッドであるため、従来の回転式目づまり検出ヘ
ッドに比べて磁気テープとの相対速度が小さいため、ヘ
ッド出力が小さくなるが、固定ヘッドの場合は巻線の巻
数を増加させることが容易であるので、巻数の増加によ
り出力低下を解消することができる。
Furthermore, since the magnetic head for head clogging detection according to the present invention is a fixed head, the relative speed with respect to the magnetic tape is lower than that of the conventional rotary type clogging detection head, so the head output is small. In this case, it is easy to increase the number of turns of the winding, so increasing the number of turns can eliminate the decrease in output.

発明の効果 以上のように本発明によれば次の効果を得ることができ
る。
Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

■ビデオ信号を記録するビデオヘッドから光分離れた位
置に設置できるので、磁気テープに記録された信号のみ
を再生し、直接ビデオヘッドからの信号をひらうことが
なく、正確に磁気テープ上の信号欠損部分を検出し得、
したがってビデオヘッドの目づまりを確実に検出できる
■Since it can be installed at a position optically separated from the video head that records the video signal, it reproduces only the signals recorded on the magnetic tape, without directly reading the signal from the video head, and accurately reproduces the signal recorded on the magnetic tape. can detect signal loss areas;
Therefore, clogging of the video head can be detected reliably.

■従来の回転式目づまり検出ヘッドにおいては、先行し
て走査した記録ビデオヘッドの軌跡を追従させるため、
目づまり検出ヘッドのトラック高さやギャップ位置を正
確に合わせる必要があり、シリンダへの組込みに非常に
高い精度を要求されるが、本発明にかかるヘッド目づま
り検出用磁気ヘッドでは、アジマス以外の精度は高精度
を要求されないので、製造が容易である。
■In the conventional rotary clogging detection head, in order to follow the trajectory of the recording video head that scanned in advance,
It is necessary to accurately match the track height and gap position of the clogging detection head, and extremely high precision is required for assembly into the cylinder. Since high precision is not required, manufacturing is easy.

■従来の回転式目づまり検出ヘッドは、磁気テープとの
相対速度が速く、摩耗の進行が速いか、本発明にかかる
ヘッド目づまり検出用磁気ヘッドは、固定式であるので
摩耗が少ない。
(2) The conventional rotary type clogging detection head has a high relative speed with the magnetic tape and wears out quickly, whereas the magnetic head for head clogging detection according to the present invention is of a fixed type and therefore has little wear.

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

第1図は従来のヘリカルスキャン式ビデオテープレコー
ダのディスク部分の平面図、第2図は磁気テープ上の磁
化パターンの説明図、第8図〜第5図は本発明の一実施
例を示し、KA8図は原理説明図、第4図は磁気テープ
上の磁化パターンの説明図、第5図は磁気ヘッドの分解
斜視図であり、第6図はヘッドチップの変形例を示す斜
視図、第7図は別の実施例における磁気ヘッドの斜視図
、第8図及び第9図はさらに別の実施例を示し、第8図
は磁気テープ上の磁化パターンの説明図、第9図は磁気
ヘッドの正面゛図である。 (8)−°°ヘッド目づ才り検出用磁気ヘッド、(9)
(ト)°・・ヘッドギャップ、αQに)・・・磁気テー
プ、Qυ(24aX24b)・・・磁化パターン、aJ
aηに)(25a)(25b)・・ヘッドチップ、Q◆
・・巻線、01に)に)・・・ハウジング代理人  群
 本 義 弘 第2図 C 第3図 第4図
FIG. 1 is a plan view of a disk portion of a conventional helical scan video tape recorder, FIG. 2 is an explanatory diagram of a magnetization pattern on a magnetic tape, and FIGS. 8 to 5 show an embodiment of the present invention. Figure KA8 is an explanatory diagram of the principle, Figure 4 is an explanatory diagram of the magnetization pattern on the magnetic tape, Figure 5 is an exploded perspective view of the magnetic head, Figure 6 is a perspective view of a modified example of the head chip, and Figure 7 is an exploded perspective view of the magnetic head. The figure is a perspective view of a magnetic head in another embodiment, FIGS. 8 and 9 show still another embodiment, FIG. 8 is an explanatory diagram of a magnetization pattern on a magnetic tape, and FIG. 9 is a diagram of a magnetic head. It is a front view. (8) -°°head magnetic head for detecting eye deviation, (9)
(G)°...Head gap, αQ)...Magnetic tape, Qυ(24aX24b)...Magnetization pattern, aJ
aη) (25a) (25b)...Head chip, Q◆
...Winding, to 01)...Housing agent Yoshihiro GunmotoFigure 2C Figure 3Figure 4

Claims (1)

【特許請求の範囲】 1、 ヘリカルスキャン式ビデオテープレコーダにより
記録された磁気テープ上におけるビデオトラックのギャ
ップアジマス角に等しいアジマス角を有するヘッドチッ
プに巻線を施し、これをハウジングに収容したヘッド目
づまり検出用磁気ヘッド。 2、 アジマス角の互いに異なる複数のヘッドチップに
それぞれ巻線を施し、これをハウジングに収容した待6
−請求の範囲第1項記載のヘッド目づまり検出用磁気ヘ
ッド。 8、 ヘッドチップの厚さ方向両面を耐摩耗性の大なる
ブロックで挟み込み、これをハウジングに収容した持i
F1:請求の範囲第1項記載のヘッド目づまり検出用磁
気ヘッド。 4、 ハウジングの材料として高透磁率磁性材料を用い
た特許請求の範囲第1項ないし第8項のいずれかに記載
のヘッド目づまり検出用磁気ヘッド。
[Claims] 1. A head chip in which a head chip having an azimuth angle equal to the gap azimuth angle of a video track on a magnetic tape recorded by a helical scan video tape recorder is wound and housed in a housing. Magnetic head for detecting blockages. 2. Winding wires are applied to a plurality of head chips with different azimuth angles, and these are housed in a housing.
- A magnetic head for head clogging detection according to claim 1. 8. Both sides of the head chip in the thickness direction are sandwiched between large wear-resistant blocks, and these are housed in a housing.
F1: A magnetic head for head clogging detection according to claim 1. 4. A magnetic head for detecting head clogging according to any one of claims 1 to 8, wherein a high permeability magnetic material is used as the material of the housing.
JP12381482A 1982-07-15 1982-07-15 Magnetic head for detecting of head clogging Pending JPS5914121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12381482A JPS5914121A (en) 1982-07-15 1982-07-15 Magnetic head for detecting of head clogging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12381482A JPS5914121A (en) 1982-07-15 1982-07-15 Magnetic head for detecting of head clogging

Publications (1)

Publication Number Publication Date
JPS5914121A true JPS5914121A (en) 1984-01-25

Family

ID=14869994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12381482A Pending JPS5914121A (en) 1982-07-15 1982-07-15 Magnetic head for detecting of head clogging

Country Status (1)

Country Link
JP (1) JPS5914121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62173614A (en) * 1986-01-28 1987-07-30 Matsushita Electric Ind Co Ltd Head clogging detector
US9943912B2 (en) 2011-12-27 2018-04-17 Franz Haimer Maschinenbau Kg Tool holder and method for producing a tool receiving portion for such a tool holder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62173614A (en) * 1986-01-28 1987-07-30 Matsushita Electric Ind Co Ltd Head clogging detector
US9943912B2 (en) 2011-12-27 2018-04-17 Franz Haimer Maschinenbau Kg Tool holder and method for producing a tool receiving portion for such a tool holder
US10967437B2 (en) 2011-12-27 2021-04-06 Franz Haimer Maschinenbau Kg Tool holder and clamping system

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