JPH0430862Y2 - - Google Patents
Info
- Publication number
- JPH0430862Y2 JPH0430862Y2 JP14216585U JP14216585U JPH0430862Y2 JP H0430862 Y2 JPH0430862 Y2 JP H0430862Y2 JP 14216585 U JP14216585 U JP 14216585U JP 14216585 U JP14216585 U JP 14216585U JP H0430862 Y2 JPH0430862 Y2 JP H0430862Y2
- Authority
- JP
- Japan
- Prior art keywords
- head
- edges
- gap
- head gap
- signal
- 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
- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は磁気ヘツドに関し、特にVTR用の磁
気ヘツドに関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to a magnetic head, and particularly to a magnetic head for a VTR.
(ロ) 従来の技術
第６図の従来例は特公昭55−34484号公報の第
７図にもみられる。このように従来はヘツド１テ
ープ対接面２においてヘツドギヤツプ３の位置か
ら離れたヘツド回転方向端部４，５を斜めにカツ
トしている。これは、端部のエツジ６，７周辺で
の漏洩磁束の発生や吸収を極力おさえようとする
配慮からである。(b) Prior Art The conventional example shown in FIG. 6 can also be seen in FIG. 7 of Japanese Patent Publication No. 55-34484. As described above, conventionally, the ends 4 and 5 of the head 1 in the tape contacting surface 2 in the direction of rotation of the head away from the position of the head gap 3 are cut obliquely. This is done in order to suppress the generation and absorption of leakage magnetic flux around the edges 6 and 7 as much as possible.
即ち、第４図のようにテープ８の記録トラツク
９を矢印方向に記録又は再生する場合に磁気ヘツ
ド１とテープ８との当接状態は第５図のようにな
るが、エツジ６，７の部分で磁束の漏洩又は吸収
が起り、あたかもそこに擬似ギヤツプが存在する
かのように作用する。これは端部が急峻であれば
ある程、強く、緩やかであれば弱い。従つて、第
６図のように端部４，５を傾斜させているのであ
る。尚、ヘツドギヤツプ３からエツジ６，７まで
の寸法l1，l2は、第３図ａに示すように例えばヘ
ツドギヤツプ３がビデオ信号中のS0′を再生する
とき、エツジ７はカラーバーストS2′を再生し、
エツジ６は次のラインの信号S1′を再生する関係
となつている。 That is, when recording or reproducing on the recording track 9 of the tape 8 in the direction of the arrow as shown in FIG. 4, the state of contact between the magnetic head 1 and the tape 8 is as shown in FIG. Magnetic flux leakage or absorption occurs in the area, acting as if a pseudo gap exists there. The steeper the edge, the stronger it is, and the more gradual it is, the weaker it is. Therefore, the ends 4 and 5 are inclined as shown in FIG. Incidentally, the dimensions l 1 and l 2 from the head gap 3 to the edges 6 and 7 are as shown in FIG . ’,
The edge 6 is connected to reproduce the signal S 1 ' of the next line.
(ハ) 考案が解決しようとする問題点
前記従来例の如く端部４，５に傾斜をつけても
擬似ギヤツプとしての働きを完全に除くことはで
きない。しかも前記l1，l1が上述の関係になつて
いることにより、本来の信号の上にエツジ６，７
による信号がノイズとして重なつて出力され見苦
しい画面となるという欠点がある。また、前記端
部の傾斜部分にはゴミなどがたまつて汚れ易くな
る。(c) Problems to be solved by the invention Even if the ends 4 and 5 are sloped as in the conventional example, the function as a pseudo gap cannot be completely eliminated. Moreover, since l 1 and l 1 have the above-mentioned relationship, edges 6 and 7 are added to the original signal.
This has the disadvantage that the signals caused by the noise are overlapped and output as noise, resulting in an unsightly screen. Further, the inclined portion of the end portion is likely to become dirty due to the accumulation of dust.
(ニ) 問題点を解決するための手段
ヘツドのテープ対接面においてヘツドギヤツプ
位置からヘツド回転方向端部のエツジまでの寸法
を水平周期の整数倍に選ぶ。(d) Measures to solve the problem: On the tape contact surface of the head, the dimension from the head gap position to the edge of the end in the rotational direction of the head is selected to be an integral multiple of the horizontal period.
(ホ) 作用
ヘツドギヤツプがカラーバーストを再生してい
るとき、エツジも異なるラインのカラーバースト
を再生する如く、ヘツドギヤツプがビデオ信号中
の或る信号部分を再生するとき、エツジは前記信
号部分と水平相関性のある信号を再生する。(E) Effect: When the head gap is reproducing a color burst, the edges are also reproducing color bursts of different lines.When the head gap is reproducing a certain signal portion in a video signal, the edges are horizontally correlated with said signal portion. play a signal with
(ヘ) 実施例
第１図において、磁気ヘツド１は一対の例えば
フエライト材よりなるコア半体１０，１１を接合
して形成され、ヘツドギヤツプ３の両サイドの切
欠に充填されたガラス１２によつて補強されてい
る。１３はコイルである。ヘツドギヤツプ３から
端部のエツジ６，７までの寸法l1，l２は水平周
期の整数倍に選ばれる。好ましい実施例としては
水平周期の１倍である。第２図はエツジ６，７を
小さくするために端部の両サイドにエツジ６，７
に向かつて端部を先端先細りとする切欠１４，１
５を設けた例であり、これによれば前記寸法l1，
l2の関係を支持しつつ、エツジ６，７での出力を
小さくする利点がある。l1，l2を水平周期（VHS
方式の場合は約370μm）の整数倍に選んだ場合に
おける映像信号との関係は第３図ｂに示すように
ヘツドギヤツプ３がカラーバーストS0を再生して
いるとき、エツジ６，７も他のラインのカラーバ
ーストS1，S2を再生する関係となる。従つて、ビ
デオ信号中の或る信号をヘツドギヤツプ３で再生
するとき、その信号と水平相関性のある他のライ
ンの信号がエツジ６，７によつて再生され、ヘツ
ドギヤツプ３の出力に重畳される。それ故、再生
画面にビートが現われない。(f) Embodiment In FIG. 1, a magnetic head 1 is formed by joining a pair of core halves 10 and 11 made of, for example, ferrite material, and is formed by glass 12 filled in notches on both sides of a head gap 3. Reinforced. 13 is a coil. The dimensions l 1 , l2 from the head gap 3 to the end edges 6, 7 are chosen to be integral multiples of the horizontal period. A preferred embodiment is one time the horizontal period. In Figure 2, edges 6 and 7 are placed on both sides of the end to reduce the size of edges 6 and 7.
A notch 14,1 whose end tapers toward the tip.
According to this example, the dimensions l 1 ,
This has the advantage of reducing the output at edges 6 and 7 while supporting the relationship l 2 . l 1 and l 2 are horizontal periods (VHS
As shown in Figure 3b, when head gap 3 is reproducing color burst S 0 , edges 6 and 7 are also reproducing other color bursts. The relationship is such that the color bursts S 1 and S 2 of the line are reproduced. Therefore, when a certain signal in the video signal is reproduced by the head gap 3, signals of other lines having a horizontal correlation with that signal are reproduced by the edges 6 and 7, and are superimposed on the output of the head gap 3. . Therefore, the beat does not appear on the playback screen.
(ト) 考案の効果
本考案によればヘツドのテープ当接面側におけ
るヘツド回転方向端部におけるエツジによる影響
によつて画面上にビートなどの不都合が生じない
という効果があり、極めて有効である。(g) Effects of the invention According to the invention, there is an effect that inconveniences such as beats do not occur on the screen due to the influence of edges at the ends of the tape contact surface of the head in the rotational direction of the head, and it is extremely effective. .
第１図は本考案を実施した磁気ヘツドの斜視図
であり、第２図は他の実施例の斜視図である。第
３図、第４図、第５図は本考案および従来例の説
明図である。第６図は従来例の斜視図である。
１……磁気ヘツド、２……テープ対接面、３…
…ヘツドギヤツプ、６，７……エツジ、l1，l2…
…寸法。
FIG. 1 is a perspective view of a magnetic head embodying the present invention, and FIG. 2 is a perspective view of another embodiment. FIG. 3, FIG. 4, and FIG. 5 are explanatory diagrams of the present invention and a conventional example. FIG. 6 is a perspective view of a conventional example. 1...Magnetic head, 2...Tape contact surface, 3...
...head gap, 6,7...edge, l 1 , l 2 ...
…size.
Claims (1)
位置からヘツド回転方向端部のエツジまでの寸法
を水平周期の整数倍に選んだことを特徴とする磁
気ヘツド。 A magnetic head characterized in that the dimension from the head gap position to the end edge in the direction of rotation of the head on the tape contacting surface of the head is selected to be an integral multiple of the horizontal period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14216585U JPH0430862Y2 (en) | 1985-09-18 | 1985-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14216585U JPH0430862Y2 (en) | 1985-09-18 | 1985-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6251512U JPS6251512U (en) | 1987-03-31 |
| JPH0430862Y2 true JPH0430862Y2 (en) | 1992-07-24 |
Family
ID=31050629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14216585U Expired JPH0430862Y2 (en) | 1985-09-18 | 1985-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0430862Y2 (en) |
-
1985
- 1985-09-18 JP JP14216585U patent/JPH0430862Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6251512U (en) | 1987-03-31 |
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