JP2653163B2 - Magnetic tape - Google Patents
Magnetic tapeInfo
- Publication number
- JP2653163B2 JP2653163B2 JP1070896A JP7089689A JP2653163B2 JP 2653163 B2 JP2653163 B2 JP 2653163B2 JP 1070896 A JP1070896 A JP 1070896A JP 7089689 A JP7089689 A JP 7089689A JP 2653163 B2 JP2653163 B2 JP 2653163B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- tape
- light
- magnetic tape
- parts
- 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)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、オーディオ，ビデオ機器あるいはコンピュ
ーター等に用い、位置検出に光センサーが利用される機
器に装填される磁気テープに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape used in audio and video equipment, a computer, and the like, which is mounted on equipment using an optical sensor for position detection.
従来の技術 磁気記録媒体は、通常透明なポリエチレンテレフタレ
ート，ポリエチレンナフタレートのような非磁性支持体
の上に磁性粉と高分子結合剤又は必要に応じて各種添加
剤とを混合してなる磁性塗料を、所定の厚さに塗布し、
磁場配向，カレンダ処理，硬化して製造される。2. Description of the Related Art A magnetic recording medium is usually a magnetic coating material obtained by mixing a magnetic powder and a polymer binder or various additives as necessary on a nonmagnetic support such as transparent polyethylene terephthalate or polyethylene naphthalate. Is applied to a predetermined thickness,
It is manufactured by magnetic orientation, calendering and curing.
磁気テープの終端検出や、磁気ディスクのインデック
スホール検出などのためには、磁気記録媒体の光透過率
の差が利用されている。たとえば、ビデオテープでは、
ビデオテープとリーダーテープの光透過率の差を用い、
ビデオテープの光透過率は0.15％（波長800nm）以下に
なるように要求されている。この目的のためには従来磁
性層中にカーボンブラックなどが添加されてきた。The difference in light transmittance of a magnetic recording medium is used for detecting the end of a magnetic tape, detecting an index hole in a magnetic disk, and the like. For example, on videotape,
Using the difference in light transmittance between video tape and leader tape,
The light transmittance of video tapes is required to be 0.15% (wavelength 800 nm) or less. For this purpose, carbon black and the like have conventionally been added to the magnetic layer.
近年、磁気記録媒体の記録密度の向上に伴ない磁性層
厚がますます薄くなり、磁性粉も細かくなり、磁性層中
のカーボンの添加も少なくなる傾向にあって、磁性層の
遮光性確保が難しくなっている。従来これらを解決する
ためには、ベースフィルムにカーボン，酸化チタン等の
無機物を含有した遮光性ベースを用いる方法（特開昭53
−3112号公報，特開昭57−205824号公報，特開昭59−18
6124号公報）、ベースフィルムの磁性層の裏面にバック
コート層を設け遮光性を増す方法（特開昭49−17203号
公報）、磁性層とベースフィルムの間に中間層を設け遮
光性を増す方法（特開昭59−110028号公報，特開昭60−
193130号公報）等が提案されているが、他の諸特性との
関係で未だ充分ではない。In recent years, as the recording density of magnetic recording media has increased, the thickness of the magnetic layer has become increasingly thinner, the magnetic powder has become finer, and the addition of carbon in the magnetic layer has tended to be reduced. It's getting harder. Conventionally, to solve these problems, a method using a light-shielding base containing an inorganic substance such as carbon or titanium oxide in a base film (Japanese Patent Laid-Open No.
JP-A-3112112, JP-A-57-205824, JP-A-59-18
No. 6124), a method of increasing the light-shielding property by providing a back coat layer on the back surface of the magnetic layer of the base film (JP-A-49-17203), and increasing the light-shielding property by providing an intermediate layer between the magnetic layer and the base film Methods (JP-A-59-110028, JP-A-60-11
No. 193130) has been proposed, but is not yet sufficient in relation to other characteristics.
発明が解決しようとする課題 上記のごとく磁気記録媒体において、ますます高密度
記録が要求されて、磁性層の遮光性確保が難しくなって
いる。さらに、最近小型のビデオテープにおいてロング
プレーの要求が高まり、それにともないベースフィルム
の厚さが14〜15μｍから10〜11μｍと薄くなり、遮光性
はさらに不利になっている。このため従来の方法では磁
気記録媒体の遮光性確保は容易ではない。Problems to be Solved by the Invention As described above, magnetic recording media are increasingly required to have high-density recording, and it is difficult to secure light-shielding properties of a magnetic layer. Further, recently, the demand for long play in small-sized video tapes has been increased, and accordingly, the thickness of the base film has been reduced from 14 to 15 μm to 10 to 11 μm, and the light-shielding property has been further disadvantageous. Therefore, it is not easy to secure the light shielding property of the magnetic recording medium by the conventional method.
本発明は上記課題に鑑み、磁気記録媒体の高密度記録
になっても、遮光性を有する磁気記録媒体を提供するも
のである。The present invention has been made in view of the above circumstances, and provides a magnetic recording medium having a light-shielding property even when high-density recording is performed on the magnetic recording medium.
課題を解決するための手段 上記課題を解決するために、特に終端検出用のリーダ
ーテープを有する気テープにおいて、非磁性支持体の偏
光面がお互いに異なるフィルムを２枚以上張り合せた構
造を有している。Means for Solving the Problems In order to solve the above-mentioned problems, in particular, in a gas tape having a leader tape for end detection, a structure in which two or more films having different polarization planes of a non-magnetic support are attached to each other is provided. doing.
作用 磁気記録媒体用のベースフィルムとして用いられるポ
リエチレンテレフタレート，ポリエチレンナフタレート
などは、機械的強度を上げるためにベースフィルム製膜
時に長手方向，幅方向に延伸して、分子を配向させてい
る。この分子配向のために、ベースフィルムは独自の偏
光面を持つことが知られており、この偏光面が互いに異
なる（60゜〜120゜）位置にくるように２枚以上張り合
わせたベースフィルムの光透過率は低くなる。従って、
このベースフィルムを用いることで、磁気記録媒体の遮
光性が確保される。Action Polyethylene terephthalate, polyethylene naphthalate, and the like used as a base film for a magnetic recording medium are stretched in the longitudinal direction and the width direction during film formation of the base film to increase the mechanical strength, and the molecules are oriented. Because of this molecular orientation, it is known that the base film has its own polarization plane, and the light of the base film that is bonded to two or more base films so that the polarization planes are at different positions (60 ° to 120 °) is different. The transmittance is low. Therefore,
By using this base film, the light shielding property of the magnetic recording medium is ensured.
実施例 以下本発明の実施例について、磁気テープで具体的に
説明する。なお実施例で述べている成分の部数は、すべ
て重量比を示すものである。Examples Hereinafter, examples of the present invention will be specifically described using a magnetic tape. In addition, the number of parts of the components described in the examples all indicates a weight ratio.
（実施例１） 磁性塗料〔Ａ〕の調整 強磁性Co被着 γ−Fe2O3 100部 BET比表面積＝30m2/g Hc＝640Oe σｓ＝75emu/g 長軸0.32μm,短軸0.06μｍ ポリウレタン樹脂 10部 塩化ビニール酢酸ビニル共重合体 10部 カーボンブラック 3部 研摩剤（Al2O3） 4部 レシチン 1部 ステアリン酸 1部 混合溶剤〔メチルエチルケトン／トルエン／ アノン＝1/1/1〕 300部 上記組成物をボールミル及びサンドミルを用いて混練
分散をおこなった後、ポリイソシアネート（コロネート
Ｌ、日本ポリウレタン（株）製）を５部添加し充分に撹
拌して得られた塗料を平均孔径１μｍのフィルターでろ
過して磁性層用塗料〔Ａ〕を準備した。(Example 1) Preparation of magnetic paint [A] Ferromagnetic Co deposition γ-Fe 2 O 3 100 parts BET specific surface area = 30 m 2 / g Hc = 640 Oe σs = 75 emu / g Long axis 0.32 μm, short axis 0.06 μm Polyurethane resin 10 parts Vinyl chloride vinyl acetate copolymer 10 parts Carbon black 3 parts Abrasive (Al 2 O 3 ) 4 parts Lecithin 1 part Stearic acid 1 part Mixed solvent [methyl ethyl ketone / toluene / anone = 1/1/1] 300 Part After kneading and dispersing the above composition using a ball mill and a sand mill, 5 parts of a polyisocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) is added and the mixture is sufficiently stirred to obtain a coating material having an average pore diameter of 1 μm. The mixture was filtered through a filter to prepare a coating material for a magnetic layer [A].
上記磁性塗料〔Ａ〕を表１の偏光面が互いに80゜の位
置にある２枚張り合せた（デュアルタイプ）ポリエステ
ルフィルムに塗布，磁場配向，乾燥処理を施した後、ス
ーパーカレンダロールによる鏡面加工処理，硬化処理
後、膜厚3.5μｍの磁性層を有する原反ロールを得た。
これを1/2インチ幅に裁断して、ビデオテープ試料（250
m長）を作成した。The above magnetic paint [A] is applied to two laminated (dual type) polyester films whose polarizing planes are located at an angle of 80 ° from each other in Table 1 and subjected to a magnetic field orientation and a drying treatment, followed by a mirror finishing by a super calender roll. After the treatment and the curing treatment, an original roll having a 3.5 μm-thick magnetic layer was obtained.
This was cut into 1/2 inch widths and videotape samples (250
m length) was created.
（実施例２） 磁性塗料〔Ｂ〕の調整 強磁性Co被着 γ−Fe2O3 100部 BET比表面積＝42m2/g Hc＝670Oe σｓ＝73emu/g 長軸0.25μm,短軸0.04μｍ ポリウレタン樹脂 10部 塩化ビニール酢酸ビニル共重合体 10部 カーボンブラック 1部 研摩剤（Al2O3） 4部 レシチン 1部 ステアリン酸 1部 混合溶剤〔メチルエチルケトン／トルエン／ アノン＝1/1/1〕 300部 上記組成物をボールミル及びサンドミルを用いて混練
分散をおこなった後、ポリイソシアネート（コロネート
Ｌ、日本ポリウレタン（株）製）を５部添加し充分に撹
拌して得られた塗料を不均孔径１μｍのフィルターでろ
過して磁性層用塗料〔Ｂ〕を準備した。 (Example 2) Preparation of magnetic paint [B] Ferromagnetic Co deposition γ-Fe 2 O 3 100 parts BET specific surface area = 42 m 2 / g Hc = 670 Oe σs = 73 emu / g Long axis 0.25 μm, short axis 0.04 μm Polyurethane resin 10 parts Vinyl chloride / vinyl acetate copolymer 10 parts Carbon black 1 part Abrasive (Al 2 O 3 ) 4 parts Lecithin 1 part Stearic acid 1 part Mixed solvent [methyl ethyl ketone / toluene / anone = 1/1/1] 300 Part After kneading and dispersing the above composition using a ball mill and a sand mill, 5 parts of a polyisocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) is added, and the mixture is sufficiently stirred to obtain a coating having an uneven pore diameter of 1 μm. To prepare a coating material [B] for a magnetic layer.
上記磁性塗料〔Ｂ〕を表１の偏光面が互いに80゜の位
置にあるデュアルタイプのポリエステルフィルムに塗
布，磁場配向，乾燥処理を施した後、スーパーカレンダ
ロールによる鏡面加工処理，硬化処理後，膜厚3.5μｍ
の磁性層を有する原反ロールを得た。これを1/2インチ
幅に裁断してビデオテープ試料（250m長）を作成した。After applying the magnetic paint [B] to a dual-type polyester film having a polarization plane shown in Table 1 at a position of 80 ° to each other, applying a magnetic field orientation, and drying, followed by mirror finishing by a super calender roll, and curing, 3.5μm thickness
The raw roll having the magnetic layer of No. 1 was obtained. This was cut into 1/2 inch width to prepare a video tape sample (250 m length).
（比較例１） 上記磁性塗料〔Ａ〕を表２の通常のポリエステルフィ
ルムに塗布，磁場配向，乾燥処理を施した後、スーパー
カレンダロールによる鏡面加工処理，硬化処理後、膜厚
3.5μｍの磁性層を有する原反ロールを得た。これを1/2
インチ巾に裁断してビデオテープ試料（250m長）を作成
した。(Comparative Example 1) The above-mentioned magnetic paint [A] was applied to a normal polyester film shown in Table 2, subjected to a magnetic field orientation and dried, then subjected to mirror finishing with a super calender roll, cured, and then to a film thickness.
A raw roll having a 3.5 μm magnetic layer was obtained. This is 1/2
A video tape sample (250 m length) was prepared by cutting to an inch width.
（比較例２） 上記磁性塗料〔Ｂ〕を表２の通常のポリエステルフィ
ルムに塗布，磁場配向，乾燥処理を施した後、スーパー
カレンダロールによる鏡面加工処理，硬化処理後、膜厚
3.5μｍの磁性層を有する原反ロールを得た。これを1/2
インチ巾に裁断して、ビデオテープ試料（250m長）を作
成した。 (Comparative Example 2) The above-mentioned magnetic paint [B] was applied to a normal polyester film shown in Table 2, subjected to magnetic field orientation and dried, then subjected to mirror finishing using a super calender roll, cured, and then to a film thickness.
A raw roll having a 3.5 μm magnetic layer was obtained. This is 1/2
The video tape sample (250 m length) was cut into inch widths.
以上の各実施例及び比較例で得られた磁気テープの光
透過率を測定し、次表の結果を得た。The light transmittance of the magnetic tape obtained in each of the above Examples and Comparative Examples was measured, and the results shown in the following table were obtained.
なお光透過率は、ビデオテープレコーダ（VTR）NV−8
200（松下電器産業（株）製）の終端検出装置を用い、
光を通す状態を100％、全く光を通さない状態を０％と
して測定した。 The light transmittance was measured using a video tape recorder (VTR) NV-8.
200 (manufactured by Matsushita Electric Industrial Co., Ltd.)
The measurement was made assuming that a state of transmitting light was 100% and a state of not transmitting light at all was 0%.
なお、上記実施例では磁気テープについて説明をした
が、本発明は磁気テープのみならず、磁気ディスク，磁
気カード等の他の磁気記録媒体に応用可能であることは
言うまでもない。Although the magnetic tape has been described in the above embodiment, it goes without saying that the present invention is applicable not only to a magnetic tape but also to other magnetic recording media such as a magnetic disk and a magnetic card.
発明の効果 以上のように本発明によれば、非磁性支持体の偏光面
がお互いに異なるフィルムを２枚張り合せた構造を有す
る非磁性支持体を用いることで、磁性層の遮光性が確保
でき、リーダーテープを有する磁気テープの終端検出を
可能にすることができる。Effects of the Invention As described above, according to the present invention, the light shielding property of the magnetic layer is ensured by using a nonmagnetic support having a structure in which two films having different polarization planes of the nonmagnetic support are bonded to each other. It is possible to detect the end of the magnetic tape having the leader tape.
Claims (1)
性支持体上に磁性層が形成されてなる磁気テープであっ
て、前記非磁性支持体の偏光面がお互いに異なるフィル
ムを２枚以上張り合せた構造を有することを特徴とする
磁気テープ。1. A magnetic tape having a leader tape for detecting an end, wherein a magnetic layer is formed on a nonmagnetic support, wherein two films having different polarization planes of the nonmagnetic support are provided. A magnetic tape having the above-mentioned structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070896A JP2653163B2 (en) | 1989-03-23 | 1989-03-23 | Magnetic tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070896A JP2653163B2 (en) | 1989-03-23 | 1989-03-23 | Magnetic tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02249122A JPH02249122A (en) | 1990-10-04 |
| JP2653163B2 true JP2653163B2 (en) | 1997-09-10 |
Family
ID=13444754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1070896A Expired - Fee Related JP2653163B2 (en) | 1989-03-23 | 1989-03-23 | Magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653163B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289523A (en) * | 1985-06-14 | 1986-12-19 | Polyplastics Co | Magnetic disk |
-
1989
- 1989-03-23 JP JP1070896A patent/JP2653163B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289523A (en) * | 1985-06-14 | 1986-12-19 | Polyplastics Co | Magnetic disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02249122A (en) | 1990-10-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |