JPH10188252A - Magnetic tape - Google Patents
Magnetic tapeInfo
- Publication number
- JPH10188252A JPH10188252A JP8354495A JP35449596A JPH10188252A JP H10188252 A JPH10188252 A JP H10188252A JP 8354495 A JP8354495 A JP 8354495A JP 35449596 A JP35449596 A JP 35449596A JP H10188252 A JPH10188252 A JP H10188252A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- tape
- young
- modulus
- leader
- 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
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は高密度磁気記録に適
した磁気テープに関するものである。The present invention relates to a magnetic tape suitable for high-density magnetic recording.
【０００２】[0002]
【従来の技術】図１に示すように、従来の磁気テープ１
は、一対のテープリール２のリールハブ３に設けられた
クランパー溝４とクランパー５との間に挟み込まれたリ
ーダーテープ６と接合され、リールハブ３の外周面に巻
回し、カセットケース内に回転自在に内装して、室内の
温度変化が緩やかな環境下で使用または保管されてい
た。2. Description of the Related Art As shown in FIG.
Is joined to a leader tape 6 sandwiched between a clamper groove 4 and a clamper 5 provided on a reel hub 3 of a pair of tape reels 2, wound around the outer peripheral surface of the reel hub 3, and rotatable in a cassette case. It was used or stored under an environment where the temperature changes slowly in the room.
【０００３】しかしながら、近年、小型ムービーが広く
使用されるようになり、使用条件は、温度，湿度ともそ
の範囲が拡大されてきている。特に高温下においては、
磁気テープ１は収縮して、再生時にトラックずれを発生
してしまう。また、収縮時の巻締まり力により、リール
ハブ３のクランパー５の形状が磁気テープ１に転写し
て、エラーレート特性の劣化を引き起こす。このような
傾向は、長時間記録を目的とした薄手磁気テープにおい
て、より顕著となっている。すなわち、近年、磁気テー
プの記録密度の向上に伴い狭トラック化，薄手化が進
み、高温下での収縮による前記問題がより顕著になって
いる。こうした傾向は磁気テープ１とリーダーテープ６
の接合部近傍の巻芯部において顕著に表れ、これらの問
題点を解決するために磁気テープの改善に関する多くの
提案がされている。However, in recent years, small movies have been widely used, and the range of use conditions has been expanded in both temperature and humidity. Especially under high temperature,
The magnetic tape 1 shrinks, causing a track shift during reproduction. In addition, the shape of the clamper 5 of the reel hub 3 is transferred to the magnetic tape 1 due to the tightening force at the time of contraction, causing deterioration of the error rate characteristic. Such a tendency is more remarkable in a thin magnetic tape intended for long-time recording. That is, in recent years, narrowing tracks and thinning have progressed with the improvement in recording density of magnetic tapes, and the above-mentioned problem due to shrinkage at high temperatures has become more prominent. This tendency is due to magnetic tape 1 and leader tape 6
This problem is remarkable in the core portion near the joint, and many proposals have been made regarding the improvement of the magnetic tape in order to solve these problems.
【０００４】例えば、磁気テープの熱収縮を小さくする
ために、特開昭５５−２９５０１号公報に示されている
ように、前もってベースフィルムを熱処理し、その熱低
収縮性のベースフィルムを使用したり、またリーダーテ
ープの改善については、特開昭６１−２０８６１６号公
報に示されているように、リーダーテープの熱低収縮化
を図ったり、特開平５−７３８７６号公報に示されてい
るように、リーダーテープの剛性強化をする改善案が考
えられているが、未だ充分なものではなく、特に磁気テ
ープの薄手化に応じられるものはなかった。For example, in order to reduce the heat shrinkage of a magnetic tape, as shown in JP-A-55-29501, a base film is heat-treated in advance, and a heat-shrinkable base film is used. As for the improvement of the leader tape, as shown in JP-A-61-208616, the thermal shrinkage of the leader tape is reduced, or as described in JP-A-5-73876. Although there is a proposal for an improvement to enhance the rigidity of the leader tape, it has not been sufficient yet, and there has been no one that can respond particularly to thinner magnetic tapes.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記従来の問
題点を解決するもので、特に過酷な環境下においても、
リーダーテープが磁気テープの収縮による変形を吸収
し、トラックずれや、エラーレート特性の劣化を抑制す
ることができる磁気テープを実現することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems.
It is an object of the present invention to realize a magnetic tape in which a leader tape absorbs deformation due to shrinkage of a magnetic tape, and can suppress track deviation and deterioration of error rate characteristics.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
に本発明の磁気テープは、磁気テープの始終端部に有す
るリーダーテープの物性を変えることにより、外的要因
による磁気テープの変形を前記リーダーテープが吸収す
るものである。According to the present invention, there is provided a magnetic tape according to the present invention, wherein the deformation of a magnetic tape caused by external factors is prevented by changing the physical properties of a leader tape provided at the start and end of the magnetic tape. This is what the leader tape absorbs.
【０００７】すなわち全厚さが８μｍ未満であって始終
端部にリーダーテープを有する磁気テープにおいて、前
記リーダーテープの熱膨張係数は絶対値の１０×１０-6
／℃未満とすることにより、過酷な環境下におかれて
も、再生時のトラックずれや、クランパーの形状転写に
よるエラーレート特性の劣化を少なくした磁気テープを
実現する手段としたものである。That is, in a magnetic tape having a total thickness of less than 8 μm and a leader tape at the beginning and end, the coefficient of thermal expansion of the leader tape is 10 × 10 −6 in absolute value.
By setting the temperature to less than / ° C, it is possible to realize a magnetic tape with reduced track deviation during reproduction and deterioration of error rate characteristics due to transfer of the shape of the clamper even in a severe environment.
【０００８】[0008]
【発明の実施の形態】本発明の請求項１記載に係る発明
は、全厚さが８μｍ未満であって、始終端部にリーダー
テープを有する磁気テープにおいて、前記リーダーテー
プの熱膨張係数は絶対値の１０×１０-6／℃未満とする
ことで、過酷な環境下におかれても、リーダーテープが
リールハブの熱変形を抑制し、磁気テープへのリールハ
ブのクランパーの形状転写が抑制され、その結果として
エラーレート特性の劣化を少なくすることができる。BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention relates to a magnetic tape having a total thickness of less than 8 μm and a leader tape at the start and end portions, wherein the thermal expansion coefficient of the leader tape is absolute. By setting the value to less than 10 × 10 −6 / ° C., even in a severe environment, the leader tape suppresses the thermal deformation of the reel hub, and the transfer of the shape of the reel hub clamper to the magnetic tape is suppressed. As a result, the deterioration of the error rate characteristics can be reduced.
【０００９】また、本発明の請求項３記載にかかる発明
は、請求項１記載に係る発明の磁気テープにおいて、リ
ーダーテープを除く部分は幅方向のヤング率が長手方向
のヤング率の１．５倍以上とし、リーダーテープは幅方
向のヤング率が長手方向のヤング率の１．５倍以上とす
ることで、磁気テープの熱変形、特に長手方向の収縮
を、リーダーテープの長手方向の熱収縮により吸収し、
トラックずれを抑制することができる。According to a third aspect of the present invention, in the magnetic tape according to the first aspect of the present invention, the portion excluding the leader tape has a Young's modulus in the width direction of 1.5 times the Young's modulus in the longitudinal direction. When the Young's modulus in the width direction of the leader tape is 1.5 times or more the Young's modulus in the longitudinal direction, the thermal deformation of the magnetic tape, especially the contraction in the longitudinal direction, is reduced by the thermal contraction in the longitudinal direction of the leader tape. Absorbed by
Track deviation can be suppressed.
【００１０】以下、本発明の実施の形態について、さら
に詳しく説明する。本発明に用いられる磁気テープの厚
みとしては８μｍ未満で、リーダーテープの全厚さは１
０μｍ未満で、かつ磁気テープを全厚さとの差が２μｍ
未満の範囲にすることが好ましい。磁気テープの厚みが
８μｍ以上になると、磁気テープ全体はリーダーテープ
によってリードされることが少なくなるため、特に熱膨
張係数や、強度を特定する必要がなくなってしまう。ま
た、リーダーテープと磁気テープの厚みの差が２μｍ以
上になると、磁気テープとリーダーテープの接合部での
段差が磁気テープに転写されやすくなり、エラーレート
特性の劣化が発生する。Hereinafter, embodiments of the present invention will be described in more detail. The thickness of the magnetic tape used in the present invention is less than 8 μm, and the total thickness of the leader tape is 1 μm.
Less than 0 μm and the difference between the magnetic tape and the total thickness is 2 μm
It is preferable to set it in the range of less than. When the thickness of the magnetic tape is 8 μm or more, the entire magnetic tape is less likely to be read by the leader tape, so that it is not necessary to particularly specify the coefficient of thermal expansion and the strength. If the difference between the thickness of the leader tape and the magnetic tape is 2 μm or more, the step at the joint between the magnetic tape and the leader tape is likely to be transferred to the magnetic tape, and the error rate characteristics deteriorate.
【００１１】以下、ディジタルビデオカセットを例にと
り、具体的に説明する。なお、本発明はこれらの実施の
形態に限定されるものではない。Hereinafter, a digital video cassette will be described as an example. The present invention is not limited to these embodiments.
【００１２】（実施の形態１）熱膨張係数が絶対値の１
０×１０-6／℃未満の８．５μｍ厚のポリエチレンナフ
タレートフィルムを６．３５ｍｍ幅にスリットし、種々
のリーダーテープを得た。次いで、６．３μｍ厚のポリ
エチレンナフタレートフィルム上に、電子ビーム法で斜
め蒸着し、膜厚０．１５μｍの酸化コバルト膜を形成
し、その上に１０ｎｍの硬質炭素膜を形成させ、更に、
パーフルオロポリエーテルを配し、磁性層と反対側のポ
リエチレンナフタレートフィルム上にバックコート層を
０．５μｍ設けて６．３５ｍｍ幅にスリットし、全厚さ
が７．０μｍの磁気テープを作成した。前記の磁気テー
プの始終端部に、前記により作成したリーダーテープを
接合して巻き込み、テープカセット本体内に回転自在に
収納し、磁気テープ試料を作成した。前記磁気テープ試
料を６０℃，９０％ＲＨ環境下に一ケ月間放置後、ヘリ
カルスキャン方式ディジタルビデオテープレコーダー
［松下電器産業（株）製，ＮＶ−ＤＪ−１］を改造して
３０分間記録し、再生時のビットエラーレート特性を測
定した。(Embodiment 1) The coefficient of thermal expansion has an absolute value of 1
An 8.5 μm thick polyethylene naphthalate film having a thickness of less than 0 × 10 −6 / ° C. was slit to a width of 6.35 mm to obtain various leader tapes. Next, on a 6.3 μm-thick polyethylene naphthalate film, oblique deposition was performed by an electron beam method to form a 0.15 μm-thick cobalt oxide film, and a 10 nm hard carbon film was formed thereon.
A perfluoropolyether was provided, a back coat layer was provided on the polyethylene naphthalate film on the side opposite to the magnetic layer at 0.5 μm, slit to a width of 6.35 mm, and a magnetic tape having a total thickness of 7.0 μm was prepared. . The leader tape prepared as described above was joined and wound around the start and end portions of the magnetic tape, and was rotatably housed in the tape cassette body to prepare a magnetic tape sample. After leaving the magnetic tape sample for one month in an environment of 60 ° C. and 90% RH, a helical scan digital video tape recorder [Matsushita Electric Industrial Co., Ltd., NV-DJ-1] was modified and recorded for 30 minutes. The bit error rate characteristics during reproduction were measured.
【００１３】その測定結果を表１に示す。Table 1 shows the measurement results.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１より明らかなように、リーダーテープ
の熱膨張係数が絶対値の１０×１０-6／℃以上の試料Ｎ
ｏ．１〜４，試料Ｎｏ．１７〜１９の場合、リールハブ
の熱変形により磁気テープへクランパーの形状が転写
し、ビットエラーレートの増加がみられた。それに対し
て、リーダーテープの熱膨張係数を絶対値の１０×１０
-6／℃未満にした試料Ｎｏ．５〜１６の場合、リーダー
テープが外部温度で殆ど変形しないため、リールハブの
熱変形が抑制され、よって磁気テープへのクランパーの
形状転写は抑制され、ビットエラーレートの増加はみら
れない。さらに試料Ｎｏ．９〜１６のように、リーダー
テープの熱膨張係数を絶対値の３×１０-6／℃以下とす
ることで、より高い効果が得られることがわかる。As is clear from Table 1, Sample N in which the coefficient of thermal expansion of the leader tape is 10 × 10 −6 / ° C. or more in absolute value
o. 1-4, sample No. In the case of Nos. 17 to 19, the shape of the clamper was transferred to the magnetic tape due to the thermal deformation of the reel hub, and the bit error rate was increased. On the other hand, the thermal expansion coefficient of the leader tape was set to the absolute value of 10 × 10
-6 / and below ℃ Sample No. In the case of 5 to 16, the leader tape hardly deforms at the external temperature, so that the thermal deformation of the reel hub is suppressed, and therefore the transfer of the shape of the clamper to the magnetic tape is suppressed, and the bit error rate does not increase. Further, the sample No. As can be seen from 9 to 16, higher effects can be obtained by setting the thermal expansion coefficient of the leader tape to 3 × 10 −6 / ° C. or less of the absolute value.
【００１６】以上のように本実施の形態１によれば、リ
ーダーテープの熱膨張係数を絶対値の１０×１０-6／℃
未満、好ましくは３×１０-6／℃以下とすることによ
り、クランパーの形状転写を抑制し、保存後も長手方向
に安定したエラーレート特性を確保できる磁気テープを
提供することができる。As described above, according to the first embodiment, the thermal expansion coefficient of the leader tape is set to the absolute value of 10 × 10 −6 / ° C.
By setting the temperature to less than 3 × 10 −6 / ° C. or less, it is possible to provide a magnetic tape capable of suppressing the transfer of the shape of the clamper and securing stable error rate characteristics in the longitudinal direction even after storage.
【００１７】（実施の形態２）熱膨張係数が絶対値の
１．９×１０-6／℃で、種々のヤング率が８．５μｍ厚
のポリエチレンナフタレートフィルムを６．３５ｍｍ幅
にスリットし、種々のリーダーテープを得た。次いで、
６．３μｍ厚で、幅方向のヤング率が長手方向のヤング
率の１．３倍，１．５倍，１．７倍の３種類のポリエチ
レンナフタレートフィルム上に、電子ビーム法で斜め蒸
着し、膜厚０．１５μｍの酸化コバルト膜を形成し、そ
の上に１０ｎｍの硬質炭素膜を形成させ、更に、パーフ
ルオロポリエーテルを配し、磁性層と反対側のポリエチ
レンナフタレートフィルム上にバックコート層を０．５
μｍ設けて６．３５ｍｍ幅にスリットし、全厚さが７．
０μｍでヤング率の異なる３種類の磁気テープを作成し
た。こうして作成した磁気テープの始終端部によって作
成したリーダーテープを接合して巻き込み、テープカセ
ット本体内に回転自在に収納し、磁気テープ試料を作成
した。この時のヤング率の測定はスティフネスより算出
した。こうして得られた磁気テープ試料を６０℃，９０
％ＲＨ環境下に一ケ月間放置後、ヘリカルスキャン方式
ディジタルビデオテープレコーダー［松下電器産業
（株）製，ＮＶ−ＤＪ−１］を改造して３０分間記録
し、再生時のビットエラーレート特性を測定した。トラ
ックずれについては、前記ビデオテープレコーダーでテ
ープ全長を記録し、６０℃，９０％ＲＨ環境下に一ケ月
間放置の前後でのトラックのずれ量を測定した。トラッ
クはビッター現像により記録パターンを現像し、工具顕
微鏡でそのずれ量を測定した。Embodiment 2 A polyethylene naphthalate film having a thermal expansion coefficient of 1.9 × 10 −6 / ° C. in absolute value and various Young's moduli of 8.5 μm in thickness is slit to a width of 6.35 mm. Various leader tapes were obtained. Then
An oblique vapor deposition is performed by an electron beam method on three types of polyethylene naphthalate films having a thickness of 6.3 μm and a Young's modulus in the width direction of 1.3, 1.5 and 1.7 times that of the longitudinal direction. A cobalt oxide film having a thickness of 0.15 μm is formed, a hard carbon film having a thickness of 10 nm is formed thereon, and a perfluoropolyether is further disposed thereon. A back coat is formed on the polyethylene naphthalate film on the opposite side of the magnetic layer. 0.5 layer
μm, slit to 6.35 mm width, total thickness of 7.
Three types of magnetic tapes having different Young's moduli at 0 μm were prepared. The leader tape produced by the start and end portions of the magnetic tape produced in this manner was joined and wound, rotatably housed in the tape cassette body, and a magnetic tape sample was produced. The measurement of the Young's modulus at this time was calculated from the stiffness. The magnetic tape sample thus obtained was subjected to
After leaving for 1 month in a% RH environment, a helical scan type digital video tape recorder [Matsushita Electric Industrial Co., Ltd., NV-DJ-1] was modified and recorded for 30 minutes, and the bit error rate characteristics at the time of reproduction were measured. It was measured. Regarding track shift, the entire length of the tape was recorded by the video tape recorder, and the track shift before and after being left for one month in an environment of 60 ° C. and 90% RH was measured. The track was developed with a recording pattern by bitter development, and the deviation was measured with a tool microscope.
【００１８】ヤング率の幅方向と長手方向の比が１．３
の磁気テープについての測定結果を表２に、１．５の磁
気テープについての測定結果を表３に、１．７の磁気テ
ープについての測定結果を表４にそれぞれ示す。The ratio of the Young's modulus in the width direction to the longitudinal direction is 1.3.
Table 2 shows the measurement results for the magnetic tape No. 1, Table 3 shows the measurement results for the magnetic tape No. 1.5, and Table 4 shows the measurement results for the magnetic tape No. 1.7.
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【表３】 [Table 3]
【００２１】[0021]
【表４】 [Table 4]
【００２２】表２〜表４から明らかなように、リーダー
テープの幅方向のヤング率が長手方向のヤング率の１．
４倍以下の場合、いずれも磁気テープの熱収縮が大き
く、その結果トラックが大きくずれてしまうが、リーダ
ーテープの幅方向のヤング率が長手方向のヤング率の
１．５倍以上にすると、磁気テープの熱変形、特に長手
方向の収縮を、リーダーテープの長手方向の熱収縮によ
り吸収し、トラックずれが抑制されるとともに安定した
エラーレート特性が得られる。特に、リーダーテープを
除く部分のテープの幅方向のヤング率が長手方向のヤン
グ率の１．５倍以上とした場合は、前記する利点が顕著
である。As is apparent from Tables 2 to 4, the Young's modulus in the width direction of the leader tape is 1.
In the case of less than 4 times, the thermal shrinkage of the magnetic tape is large in each case, and as a result, the track is largely displaced. The thermal deformation of the tape, particularly the contraction in the longitudinal direction, is absorbed by the thermal contraction in the longitudinal direction of the leader tape, so that the track deviation is suppressed and a stable error rate characteristic is obtained. In particular, when the Young's modulus in the width direction of the tape excluding the leader tape is set to 1.5 times or more the Young's modulus in the longitudinal direction, the above advantage is remarkable.
【００２３】[0023]
【発明の効果】以上の説明のように本発明は、磁気テー
プの始終端部のリーダーテープの物性、すなわち熱膨張
係数、または熱膨張係数と幅方向と長手方向のヤング率
の比を変えることにより、全厚さ８μｍ未満の磁気テー
プの始終端部にリーダーテープを有する磁気テープが過
酷な環境下におかれても、再生時のトラックずれや、ク
ランパーの形状転写によるエラーレート特性の劣化を抑
制できるという優れた磁気テープを実現できるものであ
る。As described above, according to the present invention, the physical property of the leader tape at the start and end of the magnetic tape, that is, the coefficient of thermal expansion, or the ratio of the coefficient of thermal expansion to the Young's modulus in the width direction and the longitudinal direction is changed. Therefore, even if a magnetic tape having a leader tape at the beginning and end of a magnetic tape having a total thickness of less than 8 μm is placed in a severe environment, track deviation during reproduction and deterioration of error rate characteristics due to transfer of the shape of a clamper are prevented. An excellent magnetic tape that can be suppressed can be realized.
【図１】従来の磁気テープの分解斜視図FIG. 1 is an exploded perspective view of a conventional magnetic tape.
１ 磁気テープ ２ テープリール ３ リールハブ ４ クランパー溝 ５ クランパー ６ リーダーテープ Reference Signs List 1 magnetic tape 2 tape reel 3 reel hub 4 clamper groove 5 clamper 6 leader tape
Claims (3)
にリーダーテープを有する磁気テープにおいて、前記リ
ーダーテープの熱膨張係数は絶対値の１０×１０-6／℃
未満としたことを特徴とする磁気テープ。1. A magnetic tape having a total thickness of less than 8 μm and a leader tape at the start and end portions, wherein the coefficient of thermal expansion of the leader tape is an absolute value of 10 × 10 −6 / ° C.
A magnetic tape characterized by being less than.
満としたことを特徴とする請求項１記載の磁気テープ。2. The magnetic tape according to claim 1, wherein the thermal expansion coefficient is less than an absolute value of 3 × 10 −6 / ° C.
って、リーダーテープを除く部分は幅方向のヤング率が
長手方向のヤング率の１．５倍以上とし、リーダーテー
プは幅方向のヤング率が長手方向のヤング率の１．５倍
以上としたことを特徴とする磁気テープ。3. The magnetic tape according to claim 1, wherein the portion excluding the leader tape has a Young's modulus in the width direction at least 1.5 times the Young's modulus in the longitudinal direction, and the leader tape has a Young's modulus in the width direction. A magnetic tape wherein the modulus is 1.5 times or more the Young's modulus in the longitudinal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8354495A JPH10188252A (en) | 1996-12-18 | 1996-12-18 | Magnetic tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8354495A JPH10188252A (en) | 1996-12-18 | 1996-12-18 | Magnetic tape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10188252A true JPH10188252A (en) | 1998-07-21 |
Family
ID=18437955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8354495A Pending JPH10188252A (en) | 1996-12-18 | 1996-12-18 | Magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10188252A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022158314A1 (en) * | 2021-01-20 | 2022-07-28 | ソニーグループ株式会社 | Magnetic recording medium, magnetic recording/reproducing device, and magnetic recording medium cartridge |
-
1996
- 1996-12-18 JP JP8354495A patent/JPH10188252A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022158314A1 (en) * | 2021-01-20 | 2022-07-28 | ソニーグループ株式会社 | Magnetic recording medium, magnetic recording/reproducing device, and magnetic recording medium cartridge |
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