JPH0772940B2 - Magnetic recording body - Google Patents
Magnetic recording bodyInfo
- Publication number
- JPH0772940B2 JPH0772940B2 JP22627585A JP22627585A JPH0772940B2 JP H0772940 B2 JPH0772940 B2 JP H0772940B2 JP 22627585 A JP22627585 A JP 22627585A JP 22627585 A JP22627585 A JP 22627585A JP H0772940 B2 JPH0772940 B2 JP H0772940B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- tape
- magnetic layer
- magnetic recording
- corners
- 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 - Fee Related
Links
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えばビデオテープレコーダの磁気テープと
して用いられる磁気記録体に関する。The present invention relates to a magnetic recording body used as a magnetic tape of a video tape recorder, for example.
この種の磁気テープは、通常、ポリエステルベースフィ
ルムの表面に、磁性粉、結合剤、分散剤、研磨剤および
潤滑剤等を混ぜ合わせた磁性塗料を塗布し、これを乾燥
させて磁性層を形成するか、あるいは磁性金属材料を真
空中で蒸着させることにより磁性層を形成した幅広のテ
ープ原反を、スリッターを用いて8mm、1/2インチ、3/4
インチ等の所望の幅に切断することで構成される。This type of magnetic tape is usually formed by coating the surface of a polyester base film with a magnetic paint containing a mixture of magnetic powder, binder, dispersant, abrasive, lubricant, etc., and drying it to form a magnetic layer. Or a wide tape stock with a magnetic layer formed by evaporating a magnetic metal material in vacuum, using a slitter, 8 mm, 1/2 inch, 3/4
It is constructed by cutting into a desired width such as inches.
ところで、上記テープ原反を所望の幅に切断する際、そ
の切断面に凹凸や尖鋭なバリ等が残存すると、磁気テー
プがヘッドドラムに巻き付いて走行する際、走行むらや
ヘッドのトラッキングずれを招くばかりでなく、磁気テ
ープが接するヘッドが傷付いたり早期に摩耗する等の不
具合が生じる。By the way, when the tape raw material is cut into a desired width, if unevenness or sharp burrs are left on the cut surface, when the magnetic tape is wound around the head drum and runs, it causes running unevenness and tracking deviation of the head. In addition to this, the head in contact with the magnetic tape may be damaged or may be worn early.
このため、従来ではテープ原反を切断するに際し、スリ
ッターの切れを良くし、磁気テープの切断面、つまり、
磁気テープの幅方向に沿う角部を極力に直角に形成する
ことで、切断面に凹凸やバリが残存しないようにしてい
る。For this reason, in the past, when cutting the raw tape, the slitter is cut well, and the cut surface of the magnetic tape, that is,
By forming the corners along the width direction of the magnetic tape as perpendicularly as possible, unevenness and burrs do not remain on the cut surface.
〔発明が解決しようとする問題点〕 一方、最近の磁気テープは、記録密度を高めるため、磁
性層中の磁性粒子の比率を結合剤に対し高く設定し、磁
化量を増加させる傾向にある。[Problems to be Solved by the Invention] On the other hand, in recent magnetic tapes, in order to increase the recording density, the ratio of magnetic particles in the magnetic layer is set higher than that of the binder, and the amount of magnetization tends to increase.
しかしながら、結合剤に対する磁性粒子の比率を高くす
ると、磁性層が脆くなってしまい、この磁性層の幅方向
に沿う角部にクラックや欠けが発生し易くなる。However, if the ratio of the magnetic particles to the binder is increased, the magnetic layer becomes brittle, and cracks or chips are likely to occur at the corners along the width direction of the magnetic layer.
したがって、磁気テープがヘッドドラムに巻き付いて走
行する際、磁性層の角部が欠落したり砕ける等して微細
な屑が生じる不具合があり、このため、ヘッドに対する
磁気テープの密着性が低下し、記録書き込みあるいは再
生時にドロップアウトが多発する等の問題があった。Therefore, when the magnetic tape is wound around the head drum and travels, there is a problem that fine scraps are generated due to missing or crushing of the corners of the magnetic layer, and therefore the adhesion of the magnetic tape to the head is reduced, There has been a problem that dropouts frequently occur when recording or writing.
そこで、本発明においては、磁性層の幅方向に沿う角部
に、この磁性層の一部が支持体の側部に向って丸みを以
て回り込む延長部を設けたことを特徴とする。In view of this, the present invention is characterized in that a corner portion along the width direction of the magnetic layer is provided with an extension portion around which a part of the magnetic layer is rounded toward the side portion of the support.
この発明によれば、延長部の存在によって磁性層の各部
が尖らずに滑らかな曲面となるから、例えば磁気記録体
がヘッドドラムに巻き付いて走行する際にも、この角部
にクラックや欠けが発生し難くなり、ドロップアウトの
原因となる層の発生を防止することができる。したがっ
て、磁気記録体が走行される機器側の汚れや異常摩耗を
防止できるのは勿論、信頼性の高い高密度の磁気記録が
可能となる。According to the present invention, the presence of the extended portion causes each portion of the magnetic layer to have a smooth curved surface without sharpening. Therefore, for example, even when the magnetic recording body is wound around the head drum and travels, cracks or chips are not formed in the corner portions. It becomes difficult to generate, and it is possible to prevent generation of a layer that causes dropout. Therefore, it is possible to prevent dirt and abnormal wear on the side of the device on which the magnetic recording medium runs, as well as to achieve highly reliable and high-density magnetic recording.
以下本発明の一実施例を、第１図ないし第３図にもとづ
いて説明する。An embodiment of the present invention will be described below with reference to FIGS.
第１図中符号１で示すビデオテープレコーダ用の磁気テ
ープは、非磁性材料からなるベースフィルム２の表面
に、磁性層３を所定の膜厚で被着して構成され、この磁
性層３の幅方向に沿う角部には、磁性層３の一部がテー
プベース２の側部に向って丸みを以て連続して回り込む
延長部４が形成されている。この延長部４は磁気テープ
１の製造過程で一体に成形されるもので、以下にこの磁
気テープ１の製造手順について述べる。A magnetic tape for a video tape recorder indicated by reference numeral 1 in FIG. 1 is formed by coating a surface of a base film 2 made of a non-magnetic material with a magnetic layer 3 having a predetermined thickness. At a corner portion along the width direction, an extension portion 4 is formed so that a part of the magnetic layer 3 is continuously rounded toward the side portion of the tape base 2. The extension 4 is integrally formed in the manufacturing process of the magnetic tape 1, and the manufacturing procedure of the magnetic tape 1 will be described below.
すなわち、本実施例の磁性層３は、磁性塗料を乾燥させ
てなる塗布形のもので、この磁性塗料は、例えば塩酢ビ
共重合体およびウレタン樹脂等を主成分とする結合剤
に、バリュームフェライトや鉄等の粉末からなる磁性
粉、潤滑剤、帯電防止剤、分散剤および研磨剤を充分に
混ぜ合わせたものを使用している。That is, the magnetic layer 3 of the present embodiment is a coating type obtained by drying a magnetic paint, and this magnetic paint is used as a binder containing a vinyl chloride / acetic acid vinyl chloride copolymer and a urethane resin as main components. A magnetic powder made of ferrite, iron, etc., a lubricant, an antistatic agent, a dispersant, and an abrasive are thoroughly mixed and used.
そして、磁気テープ１の製造に当たっては、先ず、例え
ばポリエチレンテレフタレートのベースフィルム２の表
面に、上記磁性塗料を塗布し、これを乾燥させることで
幅広のテープ原反５を形成する。In manufacturing the magnetic tape 1, first, the magnetic coating material is applied to the surface of the base film 2 of polyethylene terephthalate, for example, and dried to form a wide tape raw material 5.
次に、このテープ原反５に、表面を平滑化させる、いわ
ゆるカレンダー処理を施すとともに、上記磁性塗料をあ
る温度条件のもとで一定時間加熱し、磁性塗料を硬化さ
せる。この後、上記テープ原反５を、第２図に示すスリ
ッター６を用いて所望の幅に切断し、磁気テープ１を形
成する。Next, the raw tape 5 is subjected to so-called calendering to smooth the surface, and the magnetic paint is heated for a certain period of time under a certain temperature condition to cure the magnetic paint. Thereafter, the tape raw fabric 5 is cut into a desired width by using the slitter 6 shown in FIG. 2 to form the magnetic tape 1.
この場合、上記スリッター６はテープ原反５が載置され
る固定刃７と、この固定刃７上を回転する回転刃８とを
備え、これら両刃7,8間にテープ原反５を挿入すること
で、テープ原反５を直線状に切断するものであり、本実
施例では、回転刃８の刃先形状を、第２図中想像線で示
す従来の回転刃よりも狭くするとともに、両刃7,8の重
なり量Ｌを、従来一般的な0.5〜1mmから0.3mm程度にま
で少なくし、しかも、回転刃８の磁性層３側から当てが
うようにしている。In this case, the slitter 6 includes a fixed blade 7 on which the tape raw material 5 is placed, and a rotary blade 8 rotating on the fixed blade 7, and the tape raw material 5 is inserted between these two blades 7, 8. Thus, the raw tape 5 is cut linearly. In this embodiment, the shape of the blade of the rotary blade 8 is made narrower than that of the conventional rotary blade shown by the phantom line in FIG. The overlapping amount L of 8 is reduced from 0.5 to 1 mm, which is generally used in the past, to about 0.3 mm, and is applied from the magnetic layer 3 side of the rotary blade 8.
そして、このようなスリッター６により切断作業を行な
う際に、磁性塗料を硬化させるための加熱条件を適宜設
定してやれば、第１図に示すように、磁性層３の幅方向
に沿う角部が、ベースフィルム２の側部に向って丸みを
以て回り込み、上記延長部４が形成される。Then, when the heating operation for curing the magnetic paint is appropriately set when the cutting operation is performed by such a slitter 6, as shown in FIG. 1, the corner portion along the width direction of the magnetic layer 3 becomes The extension portion 4 is formed by rounding toward the side portion of the base film 2.
すなわち、この磁性塗料を硬化させるための加熱温度や
時間は、磁性塗料の組成および塗布条件によって種々変
わるものであるが、例えば加熱温度を40℃とし、24時間
加熱した後に切断すると、切断後の磁性層３の角部に尖
ったままであった。これに対し、加熱温度を30℃とし、
この温度条件で２〜３時間加熱した後に切断したとこ
ろ、磁性層３の角部に延長部４を形成することができ
た。この理由は、加熱温度を低くすると同時に、加熱時
間を短くすると、磁性塗料が完全に硬化する以前、つま
り、磁性塗料の粘度が完全に消失する以前に、この磁性
塗料の上に回転刃８が当てがわれ、この回転刃８との接
触により、磁性塗料がテープベース２の側部に向って伸
長しつつ引張られて行くためと考えられる。That is, the heating temperature and time for curing the magnetic paint are variously changed depending on the composition of the magnetic paint and the coating conditions.For example, if the heating temperature is 40 ° C. and cutting is performed after heating for 24 hours, The magnetic layer 3 remained sharp at the corners. On the other hand, the heating temperature is 30 ℃,
When it was heated under these temperature conditions for 2 to 3 hours and then cut, extension parts 4 could be formed at the corners of the magnetic layer 3. The reason for this is that if the heating temperature is lowered at the same time as the heating time is shortened, the rotary blade 8 is placed on the magnetic paint before the magnetic paint is completely cured, that is, before the viscosity of the magnetic paint is completely lost. It is thought that this is because the magnetic paint is applied and pulled by the contact with the rotary blade 8 while extending toward the side of the tape base 2.
このような本発明の一実施例によれば、磁性層３の幅方
向に沿う角部が、尖らずに滑らかな曲面3aとなるから、
結合剤に対する磁性粒子の比率を高めても、磁性層３に
欠けやクラックが発生し難くなる。したがって、ドロッ
プアウトの原因となる屑の発生を防止することができ、
信頼性の高い高密度な磁気記録が可能となる。According to such an embodiment of the present invention, since the corner portion along the width direction of the magnetic layer 3 becomes a smooth curved surface 3a without sharpening,
Even if the ratio of the magnetic particles to the binder is increased, the magnetic layer 3 is less likely to be chipped or cracked. Therefore, it is possible to prevent the generation of waste that causes dropout,
Highly reliable and high-density magnetic recording is possible.
また、磁性層３からの屑の発生が防止されるから、ビデ
オテープレコーダのヘッドやテープガイドの汚れや早期
の異常摩耗も防止できる利点がある。Further, since the generation of dust from the magnetic layer 3 is prevented, there is an advantage that the head of the video tape recorder and the tape guide can be prevented from being soiled and abnormal wear can be prevented at an early stage.
なお、本発明者らは、磁性層の角部が直角に尖った従来
の磁気テープと、本発明に係る磁気テープをビデオテー
プレコーダのデッキに装着し、15μsec18dBの条件のも
とで、記録再生を20回繰り返し、その時のドロップアウ
トの発生回数を調べる実験を行なった。The inventors of the present invention mounted the conventional magnetic tape having the corners of the magnetic layer sharpened at right angles and the magnetic tape according to the present invention on the deck of the video tape recorder, and recorded and reproduced under the condition of 15 μsec 18 dB. Experiment was repeated 20 times and the number of dropouts at that time was examined.
この結果、第３図からも明らかなように、磁性層の角部
を滑らかな曲面とした磁気テープの方が、ドロップアウ
トの発生回数が著しく少ないという結果を得た。As a result, as is clear from FIG. 3, the number of dropouts was remarkably reduced in the magnetic tape in which the corners of the magnetic layer had smooth curved surfaces.
すなわち、この理由は磁性層の角部が曲面であると、磁
気テープがヘッドドラムに巻き付いて走行する際、磁性
層の角部がヘッドに当り難くなり、このため、磁性層の
角部の欠けやクラックの発生が抑えられるためと考えら
れる。That is, the reason for this is that if the corners of the magnetic layer are curved, it becomes difficult for the corners of the magnetic layer to hit the head when the magnetic tape is wound around the head drum and run, and therefore the corners of the magnetic layer are chipped. It is considered that the occurrence of cracks and cracks is suppressed.
なお、本発明を実施するに当たっては、例えば第４図
（ａ）又は（ｂ）に示されるように、固定刃７あるいは
回転刃８のいずれかの相互摺接面に、面取り部21を設け
れば、上記テープ原反５を切断した際に、テープベース
２の磁性層３とは反対側の角部に、第５図に示すよう
に、外側に尖鋭に張出すエッジ部22を形成することがで
きる。In carrying out the present invention, as shown in FIG. 4 (a) or (b), for example, a chamfered portion 21 is provided on the mutual sliding contact surface of either the fixed blade 7 or the rotary blade 8. For example, when the raw tape 5 is cut, an edge portion 22 protruding sharply outward is formed at a corner of the tape base 2 opposite to the magnetic layer 3 as shown in FIG. You can
このように、テープベース２にエッジ部22が存在する
と、このエッジ部22が磁気テープ１の幅方向の剛性を高
めるリブとして作用するようになる。このため、磁気テ
ープが幅方向にカールする、いわゆるカッピング現象を
防止することができ、ヘッドに対する密着性が良好とな
る利点がある。Thus, when the edge portion 22 is present on the tape base 2, the edge portion 22 acts as a rib that enhances the rigidity of the magnetic tape 1 in the width direction. Therefore, it is possible to prevent the magnetic tape from curling in the width direction, that is, a so-called cupping phenomenon, and there is an advantage that the adhesion to the head becomes good.
また、上述した実施例では、磁性塗料を塗布することで
磁性層を形成したが、磁性金属材料を蒸着させることで
磁性層を形成した場合でも、同様の結果が得られること
は勿論である。Further, in the above-mentioned embodiment, the magnetic layer is formed by applying the magnetic paint, but it is needless to say that the same result can be obtained even when the magnetic layer is formed by vapor-depositing the magnetic metal material.
以上詳述した本発明によれば、磁性層の角部が尖らずに
滑らかな曲面となるから、結合剤に対する磁性粒子の比
率を高めても、磁性層に欠けやクラックが発生し難くな
り、ドロップアウトの原因となる屑の発生を防止するこ
とができる。したがって、機器側の汚れや早期摩耗を防
止できるのは勿論、信頼性の高い高密度な磁気記録が可
能となる利点がある。According to the present invention described in detail above, since the corners of the magnetic layer have a smooth curved surface without being sharpened, even if the ratio of the magnetic particles to the binder is increased, cracks or cracks are less likely to occur in the magnetic layer, It is possible to prevent the generation of dust that causes dropout. Therefore, it is possible to prevent dirt and premature wear on the device side, and it is possible to perform highly reliable and high-density magnetic recording.
第１図ないし第３図は本発明の一実施例を示し、第１図
は磁気テープの断面図、第２図は原反を切断する状態を
示す断面図、第３図はドロップアウトの発生回数を示す
特性図、第４図（ａ）（ｂ）および第５図は本発明の他
の実施例を示し、第４図（ａ）（ｂ）は夫々スリッター
の正面図、第５図は磁気テープの断面図である。 ２……非磁性体（テープベース）、３……磁性層、４…
…延長部、５……原反（テープ原反）。1 to 3 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of a magnetic tape, FIG. 2 is a cross-sectional view showing a state in which a raw fabric is cut, and FIG. 3 is a dropout occurrence. FIG. 4 (a) (b) and FIG. 5 show another embodiment of the present invention. FIG. 4 (a) (b) is a front view of a slitter, and FIG. It is sectional drawing of a magnetic tape. 2 ... Non-magnetic material (tape base), 3 ... Magnetic layer, 4 ...
… Extension part, 5 …… Original fabric (tape fabric).
Claims (1)
反を、テープ状に切断してなる磁気記録体において、 上記磁性層の幅方向に沿う角部に、この磁性層の一部が
支持体の側部に向って丸みを以て回り込む延長部を設け
たことを特徴とする磁気記録体。1. A magnetic recording material obtained by cutting a wide material having a magnetic layer formed on the surface of a non-magnetic material into a tape shape, wherein the magnetic layer is formed at a corner portion along the width direction of the magnetic layer. A magnetic recording medium, characterized in that an extension is provided, a part of which is rounded toward the side of the support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22627585A JPH0772940B2 (en) | 1985-10-11 | 1985-10-11 | Magnetic recording body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22627585A JPH0772940B2 (en) | 1985-10-11 | 1985-10-11 | Magnetic recording body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6286530A JPS6286530A (en) | 1987-04-21 |
| JPH0772940B2 true JPH0772940B2 (en) | 1995-08-02 |
Family
ID=16842655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22627585A Expired - Fee Related JPH0772940B2 (en) | 1985-10-11 | 1985-10-11 | Magnetic recording body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772940B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2632229B2 (en) * | 1990-04-18 | 1997-07-23 | 富士写真フイルム株式会社 | Magnetic tape slitting method |
| JP3527330B2 (en) * | 1995-09-22 | 2004-05-17 | 富士写真フイルム株式会社 | Photographic film manufacturing method and apparatus |
-
1985
- 1985-10-11 JP JP22627585A patent/JPH0772940B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6286530A (en) | 1987-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |