JPH0624006Y2 - Magnetic tape - Google Patents
Magnetic tapeInfo
- Publication number
- JPH0624006Y2 JPH0624006Y2 JP1984013095U JP1309584U JPH0624006Y2 JP H0624006 Y2 JPH0624006 Y2 JP H0624006Y2 JP 1984013095 U JP1984013095 U JP 1984013095U JP 1309584 U JP1309584 U JP 1309584U JP H0624006 Y2 JPH0624006 Y2 JP H0624006Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic tape
- recording medium
- layer
- tape
- 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 - Lifetime
Links
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【考案の詳細な説明】 本考案は情報通信，音響，画像等に使用される磁気テー
プに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape used for information communication, sound, images and the like.
従来の磁気テープの構造は，第１図(a)に示すように，
プラスチックフィルムベース２と磁気記録媒体１とより
構成されており，一般に第２図(a)に示すように，リー
ル４に巻いて使用される。The structure of the conventional magnetic tape is as shown in Fig. 1 (a).
It is composed of a plastic film base 2 and a magnetic recording medium 1, and is generally wound around a reel 4 and used as shown in FIG.
磁気テープへの情報の記録は，磁気ヘッドにより第１図
(b)の如く，記録媒体１へＮ極Ｓ極として記録される
が，その磁界は同図矢印の如く記録媒体１の外側に漏れ
ている。従って，磁気テープがリール４にまかれて使用
されていると，第２図(b)に示すように隣接テープ層の
記録情報が漏れ磁束によって記録されるという，いわゆ
る転写効果が存在する。転写効果は温度，湿度，圧力，
ベースの厚さ等の影響を受け，磁気テープの保守上，重
大な欠点となっており，この転写を防止するためには従
来は，テープを時々巻き直したり，記録し直したり，あ
るいは冷所に保管することを必要とし，使用上重大な障
害となっていた。Recording of information on a magnetic tape is performed by a magnetic head as shown in FIG.
As shown in (b), the magnetic field is recorded as N pole and S pole on the recording medium 1, but its magnetic field leaks to the outside of the recording medium 1 as shown by the arrow in the figure. Therefore, when the magnetic tape is used while being wound around the reel 4, there is a so-called transfer effect in which the recording information of the adjacent tape layer is recorded by the leakage magnetic flux as shown in FIG. 2 (b). Transfer effect is temperature, humidity, pressure,
The magnetic tape is affected by the thickness of the base, which is a serious drawback in the maintenance of the magnetic tape. In order to prevent this transfer, conventionally, the tape is sometimes rewound, rerecorded, or in a cold place. It was necessary to store it in the room, which was a serious obstacle to use.
本考案は，これらの欠点を除去するため，転写効果を殆
んど無くした磁気テープを提供することを目的とするも
のである。An object of the present invention is to provide a magnetic tape having almost no transfer effect in order to eliminate these drawbacks.
本考案によれば，プラスチックフィルムベース上に磁気
記録媒体層を設けた磁気テープにおいて，該磁気記録媒
体層の上面に軟磁性層が積層されていることを特徴とす
る磁気テープが得られる。According to the present invention, there is obtained a magnetic tape having a magnetic recording medium layer provided on a plastic film base, wherein a soft magnetic layer is laminated on the upper surface of the magnetic recording medium layer.
以下本考案の実施例を図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
第３図を参照して，本考案の一実施例である磁気テープ
は，プラスチックフィルムベース２の表面上に磁気記録
媒体層１を設け，その磁気記録媒体層１の表面上に軟磁
性層３が積層された構造となっている。この構造では軟
磁性層３が磁気記録媒体層１中の磁極による磁界を閉じ
込めて，外部への漏れ磁束を減少させる。従って，この
構造の磁気テープを第４図(a)に示すようにリール４に
巻いて使用しても，第４図(b)に示すように，磁気記録
媒体層１同志の間に，軟磁性層３が介在して磁気シール
ドとして働くため，磁気記録層間の相互干渉を著しく減
少せしめる。それ故，転写効果が大巾に減少され，従来
の欠点が解消される。Referring to FIG. 3, a magnetic tape according to an embodiment of the present invention is provided with a magnetic recording medium layer 1 on the surface of a plastic film base 2 and a soft magnetic layer 3 on the surface of the magnetic recording medium layer 1. Has a laminated structure. In this structure, the soft magnetic layer 3 confines the magnetic field generated by the magnetic poles in the magnetic recording medium layer 1 and reduces the leakage flux to the outside. Therefore, even if the magnetic tape of this structure is wound around the reel 4 as shown in FIG. 4 (a) and used, as shown in FIG. 4 (b), the magnetic tape is softened between the magnetic recording medium layers 1. Since the magnetic layer 3 intervenes and acts as a magnetic shield, mutual interference between the magnetic recording layers can be significantly reduced. Therefore, the transfer effect is greatly reduced, and the conventional defects are eliminated.
ベースフィルム２として１０μのプラスチックフィルム
を用い，その上に磁気記録媒体層１としてγ-Fe2O3を５
μ厚に塗布した磁気テープと，更にその上に軟磁性層３
としてMn-Znフェライト粉末あるいはセンダスト（登録
商標）粉末を塗布した磁気テープを製作し，それぞれの
テープに210BPIでテープ速度１９cm/secで記録し，読取
った場合の出力を測定した。その結果は表１のとおりで
あった。A 10 μ plastic film is used as the base film 2, and γ-Fe 2 O 3 is used as the magnetic recording medium layer 1 on the plastic film.
A magnetic tape with a thickness of μ and a soft magnetic layer 3 on top of it
Magnetic tapes coated with Mn-Zn ferrite powder or Sendust (registered trademark) powder were manufactured, and each tape was recorded at 210 BPI at a tape speed of 19 cm / sec, and the output when read was measured. The results are shown in Table 1.
表１から明らかなように，軟磁性層を設けることによっ
て，漏れ磁界が著しく減少する。また，この程度の漏れ
磁界では転写効果はほとんど生じない。 As is clear from Table 1, the stray magnetic field is significantly reduced by providing the soft magnetic layer. Also, with this level of leakage magnetic field, the transfer effect hardly occurs.
なお，軟磁性層３は，その飽和磁束量が磁気記録媒体層
１の全磁束量とほぼ同等になるように選ばれれば良い。
一般に金属系の粉末はフェライト系の粉末に比して飽和
磁束密度が高いので，軟磁性層として，フェライト系の
粉末よりも金属系の粉末を用いる方が厚みを薄くでき，
より有効である。The soft magnetic layer 3 may be selected so that the saturation magnetic flux amount thereof is substantially equal to the total magnetic flux amount of the magnetic recording medium layer 1.
In general, metal-based powders have higher saturation magnetic flux density than ferrite-based powders, so using metal-based powders as the soft magnetic layer can reduce the thickness of ferrite-based powders.
More effective.
なお，記録情報の再生に際しては，外側の軟磁性層３を
磁気飽和させれば良い。In reproducing the recorded information, the outer soft magnetic layer 3 may be magnetically saturated.
このように磁気飽和させるためには，通常の読取りヘッ
ドでは，磁気テープの軟磁性層のシールド効果のため最
もシールド効果の悪いMn-Zn粉末の場合でも，７００Ｂ
ＰＩ以上のビット密度の磁気データは殆ど読取り得なか
った。この磁気テープを読み取るためには，読取り装置
にはかかる磁気飽和装置は装着されていない。従って，
本考案の実施例に係る磁気テープは，通常の磁気読取り
装置では，全く読み取ることができないか，不正確にし
か読み取り得ないので，機密保持を行うことができる。In order to magnetically saturate in this way, in the case of an ordinary read head, even if the Mn-Zn powder, which has the worst shield effect due to the shield effect of the soft magnetic layer of the magnetic tape, is 700B.
Almost no magnetic data having a bit density higher than PI could be read. In order to read this magnetic tape, the magnetic saturation device is not attached to the reading device. Therefore,
Since the magnetic tape according to the embodiment of the present invention cannot be read at all by a normal magnetic reader or can be read only inaccurately, confidentiality can be maintained.
以上述べたように，本考案によれば，転写効果のほとん
どない磁気テープを得ることが出来るとともに，テープ
は盗難にあってもその記録された情報は読み取られるこ
となく秘密は保全される。As described above, according to the present invention, a magnetic tape having almost no transfer effect can be obtained, and even if the tape is stolen, the recorded information is not read and the secret is maintained.
第１図は従来の磁気テープを示す図で，(a)図は断面
図，(b)図は漏れ磁束を示す説明図，第２図は従来の磁
気テープをリールに巻いた場合の転写効果を示す図で，
(a)図はリールに巻いた状態を示す平面図，(b)図は(a)
図のＡ部拡大断面図，第３図は本考案の一実施例の磁気
テープの断面図，第４図は同磁気テープをリールに巻い
た状態を示す図で，(a)図は平面図，(b)図は，(a)図の
Ａ部拡大断面図である。 １…磁気記録媒体層，２…フィルムベース，３…軟磁性
層，４…リール。FIG. 1 is a view showing a conventional magnetic tape, (a) is a sectional view, (b) is an explanatory view showing leakage flux, and FIG. 2 is a transfer effect when the conventional magnetic tape is wound on a reel. In the figure,
Figure (a) is a plan view showing the reel wound, (b) is (a).
FIG. 3 is an enlarged sectional view of part A of the figure, FIG. 3 is a sectional view of a magnetic tape according to an embodiment of the present invention, FIG. , (B) figure is an enlarged sectional view of the A part of (a) figure. 1 ... Magnetic recording medium layer, 2 ... Film base, 3 ... Soft magnetic layer, 4 ... Reel.
───────────────────────────────────────────────────── フロントページの続き (72)考案者 小谷 祐三 茨城県筑波郡谷田部町大字花島新田字北原 28番１ 東北金属工業株式会社内 (72)考案者 矢野 矩雄 神奈川県横須賀市武１丁目2356番地 日本 電信電話公社横須賀電気通信研究所内 (56)参考文献 実開 昭56−111440（ＪＰ，Ｕ) 実開 昭56−51136（ＪＰ，Ｕ) 実開 昭49−101703（ＪＰ，Ｕ) 特公 昭29−325（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuzo Otani Yuzo Otani 28-1 Kitahara, Nittabe, Yatabe-cho, Tsukuba-gun, Ibaraki Tohoku Metal Industry Co., Ltd. (72) Norio Yano, 1 Takeshi, Yokosuka, Kanagawa Address 2356 Nippon Telegraph and Telephone Public Corporation Yokosuka Electro-Communications Research Laboratory (56) References Actually open 56-111440 (JP, U) Actually open 56-51136 (JP, U) Actually open 49-101703 (JP, U) Special Kosho 29-325 (JP, B1)
Claims (1)
媒体層を設けた磁気テープにおいて，該磁気記録媒体層
の上面に軟磁性層が積層されていることを特徴とする磁
気テープ。1. A magnetic tape in which a magnetic recording medium layer is provided on a plastic film base, wherein a soft magnetic layer is laminated on the upper surface of the magnetic recording medium layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984013095U JPH0624006Y2 (en) | 1984-02-03 | 1984-02-03 | Magnetic tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984013095U JPH0624006Y2 (en) | 1984-02-03 | 1984-02-03 | Magnetic tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60127623U JPS60127623U (en) | 1985-08-27 |
| JPH0624006Y2 true JPH0624006Y2 (en) | 1994-06-22 |
Family
ID=30496780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984013095U Expired - Lifetime JPH0624006Y2 (en) | 1984-02-03 | 1984-02-03 | Magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624006Y2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911704U (en) * | 1972-04-28 | 1974-01-31 | ||
| JPS49101703U (en) * | 1972-12-22 | 1974-09-02 | ||
| JPS5847531Y2 (en) * | 1979-09-20 | 1983-10-29 | 東北金属工業株式会社 | magnetic card |
| JPS5850494Y2 (en) * | 1980-01-26 | 1983-11-17 | 東北金属工業株式会社 | magnetic card |
-
1984
- 1984-02-03 JP JP1984013095U patent/JPH0624006Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60127623U (en) | 1985-08-27 |
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