JPS5958674A - Magnetic tape cassette - Google Patents
Magnetic tape cassetteInfo
- Publication number
- JPS5958674A JPS5958674A JP17013882A JP17013882A JPS5958674A JP S5958674 A JPS5958674 A JP S5958674A JP 17013882 A JP17013882 A JP 17013882A JP 17013882 A JP17013882 A JP 17013882A JP S5958674 A JPS5958674 A JP S5958674A
- Authority
- JP
- Japan
- Prior art keywords
- thermal expansion
- tape
- magnetic tape
- reel
- magnetic
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 42
- 239000010409 thin film Substances 0.000 claims abstract description 18
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims 1
- 239000004677 Nylon Substances 0.000 abstract description 5
- 229920001778 nylon Polymers 0.000 abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 4
- 239000010936 titanium Substances 0.000 abstract description 4
- 229910052719 titanium Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229920006267 polyester film Polymers 0.000 abstract description 2
- 238000000151 deposition Methods 0.000 abstract 1
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000004804 winding Methods 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- -1 their oxides Inorganic materials 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006254 polymer film Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910016629 MnBi Inorganic materials 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- MIQMFTDGRBLTFQ-UHFFFAOYSA-N ethenyl 2-oxoacetate Chemical group C=COC(=O)C=O MIQMFTDGRBLTFQ-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/037—Single reels or spools
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁性層として強磁性薄膜を有する磁気テープが
リールまたはノ・プに巻回されたカセットに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cassette in which a magnetic tape having a ferromagnetic thin film as a magnetic layer is wound on a reel or a nozzle.
従来例の構成とその問題点
Ｆｅ、 Ｃｏ 、旧あるいはそれらの合金、それらの酸
化物やＭｎＢ ｉ等の強磁性材料よりなる強磁性薄膜を
真空蒸着、イオンブレーティング、スノくツタリング、
メッキ等の方法で、ポリエステル、ポＩＪアミド等の高
分子フィルム上に形成した強磁性薄膜型磁気テープは従
来の塗布型磁気テープに比べ記録密度を飛躍的に向上さ
せることが可能であるが、そのためにはテープの表面性
を充分良好な状態に保つ必要がある。The structure of conventional examples and their problems A ferromagnetic thin film made of ferromagnetic materials such as Fe, Co, old metals, their alloys, their oxides, and MnBi is formed by vacuum evaporation, ion blating, snobbing, etc.
Ferromagnetic thin-film magnetic tapes formed on polymeric films such as polyester and polyjamide using plating methods can dramatically improve recording density compared to conventional coated magnetic tapes. For this purpose, it is necessary to maintain the surface properties of the tape in a sufficiently good condition.
従来、酸化鉄をポリウレタン、エポキシ、塩ビ酢ビ共重
合体等の有機バインダ材に混練し、ポリエステルフィル
ムに塗工乾燥した、いわゆる塗布型磁気テープが実用に
供されている。そして、通常、塗布型テープは成型性と
耐摩耗性に優れたポリアセタール、ナイロン、アクリル
スチロール。BACKGROUND ART Conventionally, so-called coated magnetic tapes have been put into practical use, in which iron oxide is kneaded with an organic binder material such as polyurethane, epoxy, or vinyl chloride-vinyl acetate copolymer, and the mixture is coated on a polyester film and dried. Painted tapes are usually made of polyacetal, nylon, or acrylic styrene, which have excellent moldability and abrasion resistance.
アクリルブタジェンスチロール等の樹脂で成型されたリ
ールやハブに巻回し使用している。なおこの場合、塗布
型テープの熱膨張率は２．２Ｘ１０〜２．５ Ｘ １０
／℃程度で、一方上記リールやノ・プの材料の熱膨張率
は６×１０〜１０Ｘ１０／’Ｃである。It is used by winding it around a reel or hub made of resin such as acrylic butadiene styrene. In this case, the coefficient of thermal expansion of the coated tape is 2.2X10 to 2.5X10
/°C, and on the other hand, the coefficient of thermal expansion of the material of the reel and nozzle is 6×10 to 10×10/’C.
ところで上記のような塗布型テープ用のリールやハブに
薄膜型磁気テープ巻回し番セ可用いた場合には強磁性薄
膜にクラック（亀裂）が発生することがあった。By the way, when a thin film type magnetic tape winding number is used in a reel or hub for a coated tape as described above, cracks may occur in the ferromagnetic thin film.
発明の目的
本発明は従来における以上のような問題を解決し、強磁
性薄膜のクラック発生を防止することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to prevent the occurrence of cracks in ferromagnetic thin films.
発明の構成
本発明は磁気テープの熱膨張率とその磁気テープが巻回
されるリールまたはノ・ブの熱膨張率との関係に着目す
ることによりなされたもので、すなわち、リールまたは
ノ・ブの熱膨張率から磁気テープの熱膨張率を差引いた
値が２Ｘ１０／’Ｃ以下であることを特徴とするもので
ある０
実施例の説明
表面粗さＲｍａｘが３００人の極Ｃて表面性の良いポリ
エステルフィルム（厚さ１ｏ、０μ）上の片面に連続真
空斜め蒸着法によＶ）Ｇｏ・Ｎ１強磁性薄膜（Ｎｉ ２
０ ｗｔ％、膜厚１４００人）を微量の酸素の存在下で
形成した０反対面側にはバックコートとして、熱硬化性
ポリエステルバインダにカーボンを１０ ｗｔ％混練し
たものを０．５μ厚さに塗工形成した。これを１７４イ
ンチ幅にスリットして磁気テープとし外径１５語のノ・
ブに気温５℃の環境下で磁性面を外側にして長さ１００
ｍのテープをパックテンション２０ｑで巻回し、６５℃
の乾燥器に２週間放置した。これは冬期に走行使用した
テープを夏期に自動車内に放置した場合等を想定した実
用保存特性のモデル試験である。なお、この磁気テープ
の初期の表面粗さは磁性面側でＲｍａｘ＝ ３００人で
、バックコート面側はａｍａｚ−１２００人であシ、ま
た、テープの熱膨張率は２、ＯＸ １０ ／°ｃ
であった０図はこの試験を行なツタのち、テープをビデ
オテープレコーダにかけてカラーのＳ／Ｎｔ−測定した
結果を示す０繰軸はカラーのＳ／Ｎ値を示し、高温放置
試験前のテープのＳ／Ｎ値をＯｄＢとしている。横軸は
テープを巻回した・・ブの熱膨張率からテープの熱膨張
率の値を引いた値を示す。使用したハブはチタン（熱膨
張率は０．９Ｘ１０ ）、ステンレススティール（１
，７３Ｘ１０ ）、アルミニウム（２，３６ｘ１（）
）、、マグネシウム（２，５Ｘ１０ ） 、ナイロ
ン（１０×１０ ）、ガラス繊維光てんナイロン（充て
ん率を変えることにより２〜１０×１０５までのハブを
作った）であった。また図中Ｘ印は蒸着した磁性薄膜に
微小なりラックが発生したことを示し、○印はクラック
が認められなかったことを示す。試料を観察した結果、
ハブの熱膨張率とテープの熱膨張率の差が２×１ｏ よ
り大きいハブに巻回したテープは磁性面側の表面性が悪
くなっており、熱膨張率の差が大きいものほどこの傾向
が著しくなり、差が４×１０ 以上の試料については磁
性薄膜にクラックが発生している状態がみられたー。Structure of the Invention The present invention was made by focusing on the relationship between the coefficient of thermal expansion of a magnetic tape and the coefficient of thermal expansion of a reel or knob around which the magnetic tape is wound. It is characterized in that the value obtained by subtracting the coefficient of thermal expansion of the magnetic tape from the coefficient of thermal expansion of the magnetic tape is 2×10/'C or less. V) Go/N1 ferromagnetic thin film (Ni 2
0 wt%, film thickness 1,400 mm) was formed in the presence of a trace amount of oxygen.On the other side, a thermosetting polyester binder mixed with 10 wt% of carbon was coated to a thickness of 0.5μ as a back coat. Coated and formed. This was slit into 174-inch width to make magnetic tape with an outer diameter of 15 words.
100mm long with the magnetic side outside in an environment with a temperature of 5℃.
Wound the tape with a pack tension of 20q at 65℃.
It was left in a dryer for two weeks. This is a model test of practical storage characteristics assuming that a tape used during winter driving is left in a car during summer. The initial surface roughness of this magnetic tape was Rmax = 300 on the magnetic side, and AMAZ - 1200 on the back coat side, and the thermal expansion coefficient of the tape was 2, OX 10 /°c.
The 0 graph shows the result of color S/Nt-measurement after conducting this test and then putting the tape on a videotape recorder. The S/N value of is OdB. The horizontal axis indicates the value obtained by subtracting the coefficient of thermal expansion of the tape from the coefficient of thermal expansion of the tape wound around it. The hubs used were titanium (thermal expansion coefficient: 0.9 x 10) and stainless steel (1
,73x10), aluminum (2,36x1()
), magnesium (2,5×10), nylon (10×10), and glass fiber nylon (by changing the filling ratio, hubs ranging from 2 to 10×105 were made). Further, in the figure, the X mark indicates that a small rack was generated in the deposited magnetic thin film, and the O mark indicates that no crack was observed. As a result of observing the sample,
Tapes wound around hubs where the difference between the coefficient of thermal expansion of the hub and the coefficient of thermal expansion of the tape is greater than 2×1o have poor surface properties on the magnetic side, and this tendency increases as the difference in coefficient of thermal expansion increases. The difference was significant, and cracks were observed in the magnetic thin film for samples with a difference of 4 x 10 or more.
この現象を解析した結果を以下に述べる。強磁性薄膜は
従来の塗布型テープの磁性層と比べ柔軟性がなく、塑性
変型しやすいので、テープの熱膨張率に比べ、ハブの熱
膨張率が大きいと、温度上昇によシハブが膨張し、テー
プを内側から圧迫するので磁気テープのバック側の粗い
表面が、表面性の良い磁性層に強くおしつけられ磁性層
が塑性変形し表面性が著しく悪くなるためカラーのジ下
値が劣化する。また、薄膜磁気テープを引張り試験する
と約０．４％程度の伸びでクラックが発生する。これは
高分子フィルムの弾性変形に薄膜磁性層が追従できなく
なるためであシ、従来の塗布型テープには発生しない現
象である０この巻回加熱試験においても、・・ブの熱膨
張率が大きい場合はテープが著しく伸ばされるためクラ
ックが発生する。例えばノ・ブの熱膨張率が１０Ｘ１０
のとき６０ｍ温度上昇すれば・・ブ付近のテープは
０．６％程度伸ばされることになるからである。The results of analyzing this phenomenon are described below. The ferromagnetic thin film is less flexible than the magnetic layer of conventional coated tapes and easily deforms plastically, so if the coefficient of thermal expansion of the hub is greater than that of the tape, the hub will expand due to temperature rise. Since the tape is compressed from the inside, the rough surface on the back side of the magnetic tape is strongly pressed against the magnetic layer, which has good surface properties, causing plastic deformation of the magnetic layer and significantly worsening the surface properties, resulting in a deterioration of the color underside value. Furthermore, when a thin film magnetic tape is subjected to a tensile test, cracks occur at an elongation of approximately 0.4%. This is because the thin magnetic layer is unable to follow the elastic deformation of the polymer film, a phenomenon that does not occur with conventional coated tapes.Even in this winding heating test, the thermal expansion coefficient of... If it is too large, the tape will be stretched significantly and cracks will occur. For example, the coefficient of thermal expansion of knob is 10X10
This is because if the temperature rises by 60 m in this case, the tape near B will be stretched by about 0.6%.
なお、バックコート面の表面性を良くすればＳ／Ｎ値の
劣化は低減する傾向にあることが確認されているが、あ
ま９バツクコ一ト面の表面を平滑にすると、早送りや巻
戻し時にテープの巻取性が著しく悪くなり、整列巻きが
不可能になり、時としてジャミング（すができる）が発
生するという問題がある。It has been confirmed that improving the surface quality of the back coat surface tends to reduce the deterioration of the S/N value, but if the surface of the back coat surface is made smooth, it will be difficult to use when fast forwarding or rewinding. There is a problem that the winding properties of the tape are significantly deteriorated, making it impossible to wind the tape in an aligned manner, and sometimes jamming occurs.
また、この他、ハブについては各種高分子材料、高分子
フィルムについてはポリアミド、ポリエチレンテレナフ
タレート等、バックコートの各種組成および条件、薄膜
の各種製法および材料、ノ・ブの径およびテープ幅の違
い等に関して確認実験を行なったが、いずれの場合もリ
ールまたはハブの熱膨張率と磁気テープの熱膨張率の差
が２×１０／’Ｃ以下、より好ましくは１． ｓ ｘ
１０ ／’Ｃ以下であれば、前述のような効果の得られ
ることが確認された。In addition, we also use various polymer materials for hubs, polyamide, polyethylene terenaphthalate, etc. for polymer films, various compositions and conditions for back coats, various manufacturing methods and materials for thin films, differences in knob diameter and tape width. Confirmation experiments were conducted regarding the above, but in all cases, the difference between the coefficient of thermal expansion of the reel or hub and the coefficient of thermal expansion of the magnetic tape was 2×10/'C or less, more preferably 1. s x
It was confirmed that the above-mentioned effects can be obtained if the temperature is 10/'C or less.
次にリールまたはハブの材料について説明する。Next, the material of the reel or hub will be explained.
従来の塗布型テープの場合、磁性層が弾力性を有し、ま
た特殊な表面形状の必要度も小さい（記録密度が低いた
め）のでリールあるいはノ・プの材料としては単に寸法
精度と耐久性を満足すれば良かっただめ、ポリアセクー
ル（熱膨張率１０ｘ１ｏ ）。In the case of conventional coated tape, the magnetic layer has elasticity and there is little need for a special surface shape (because the recording density is low), so the material for the reel or tape is simply dimensional accuracy and durability. If it satisfies the following, polyacecool (coefficient of thermal expansion 10x1o) is used.
ナイロン（１ｏｘ１ｏ Ｌアクリルスチロール（７Ｘ１
０ ）、７クリルブタジエンスチロール（８×１ｏ
）等が使用されているが、いずれも上述の如く、薄膜磁
気テープには不適であり、本発明の要件を満足するには
従来にない材質を選択する必要がある。以下に薄膜磁気
テープに適したリールまたはハブ材料の具体例を示す０
チタン（熱膨張率０．９Ｘ１０）、ステンレス（１，７
３Ｘ１０ ）ｌアルミニウム（２，３６Ｘ １０ ）。Nylon (1ox1o L acrylic styrene (7X1
0 ), 7crylbutadiene styrene (8×1o
), but as mentioned above, all of them are unsuitable for thin film magnetic tapes, and in order to satisfy the requirements of the present invention, it is necessary to select materials that have not been used in the past. Specific examples of reel or hub materials suitable for thin film magnetic tape are shown below.
Titanium (coefficient of thermal expansion 0.9X10), stainless steel (1.7
3X10 ) l aluminum (2,36X 10 ).
マグネシウム（２，５Ｘ １０）等とこれらを主体とす
る合金等が適当である。Suitable materials include magnesium (2,5×10) and alloys mainly composed of magnesium.
高分子材料としてはポリフェニレンサルファイド（１，
８〜１．９Ｘ１０）、シリカ粉末あるいはガラス繊維を
２０％以上充てんしたエポキシ樹脂（１６６〜２．７Ｘ
１０）、ジアリルフタレート（３８３〜３．○Ｘ１０）
、ガラス繊維充てん不飽和ポリエステル（１，２〜３．
ｏｘｌｏ）、フェノール樹脂（２，５〜３Ｘ１０ ）
、 ガラス繊維充てんフェノール樹脂（１，５〜２．
２ｘ１０ ）、シリコーン樹脂（１，４〜３ｘ１０ ）
、ガラス繊維２０〜ｂ
ポリカーボネイト（３，４Ｘ１０）、ガラス繊維３０％
充てんポリカーボネイト（２，７ｘ１０）＋ガラス繊維
３０％充てんポリブチレンチレフタレ５
−ト（２，０〜２．７ Ｘ １０ ）等が適癌であり、
これらの充てん材の形状、材料、充てん率等は本発明の
限定要件の範囲で適宜選択できることはもちろんである
。Polyphenylene sulfide (1,
8~1.9X10), epoxy resin filled with 20% or more of silica powder or glass fiber (166~2.7X
10), diallyl phthalate (383-3.○X10)
, glass fiber-filled unsaturated polyester (1,2-3.
oxlo), phenolic resin (2,5~3X10)
, glass fiber-filled phenolic resin (1,5-2.
2x10), silicone resin (1,4-3x10)
, glass fiber 20~b polycarbonate (3,4X10), glass fiber 30%
Filled polycarbonate (2.7 x 10) + 30% glass fiber filled polybutylene ethylene terephthalate (2.0 - 2.7 x 10) etc. are suitable.
It goes without saying that the shape, material, filling rate, etc. of these fillers can be appropriately selected within the scope of the limiting requirements of the present invention.
発明の効果
本発明による磁気テープカセットは磁気テープの強磁性
薄膜にクラックが生じるのが防止されて保存性が著しく
改良され、その実用性は犬なるものである。Effects of the Invention The magnetic tape cassette according to the present invention prevents cracks from occurring in the ferromagnetic thin film of the magnetic tape, significantly improves storage stability, and has excellent practicality.
図は本発明の詳細な説明するだめの図で、ハブの熱膨張
率からテープの熱膨張率を差し引いた値とカラーＳ／Ｎ
値との関係を示す。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名文
う
！
り
ｊ
（〆ｔThe figure is a detailed explanation of the present invention, and shows the value obtained by subtracting the coefficient of thermal expansion of the tape from the coefficient of thermal expansion of the hub, and the color S/N.
Indicates the relationship with the value. Name of agent: Patent attorney Toshio Nakao and one other person! rij (〆t
Claims (1)
気テープが巻回されるリールまたはノ・ブとを有し、上
記リールまたはノ・ブの熱膨張率から上記磁気テープの
熱膨張率を差引いた値が２ ｘ １０ ”７Ｇ以下であ
ることを特徴とする磁気テープカセット０It has a magnetic tape with a ferromagnetic thin film provided on a substrate, and a reel or knob around which the magnetic tape is wound, and the coefficient of thermal expansion of the magnetic tape is determined from the coefficient of thermal expansion of the reel or knob. A magnetic tape cassette 0 characterized in that the value obtained by subtracting the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17013882A JPS5958674A (en) | 1982-09-28 | 1982-09-28 | Magnetic tape cassette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17013882A JPS5958674A (en) | 1982-09-28 | 1982-09-28 | Magnetic tape cassette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5958674A true JPS5958674A (en) | 1984-04-04 |
Family
ID=15899364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17013882A Pending JPS5958674A (en) | 1982-09-28 | 1982-09-28 | Magnetic tape cassette |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5958674A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5205507A (en) * | 1989-03-15 | 1993-04-27 | Tdk Corporation | Hub for tape cassette |
-
1982
- 1982-09-28 JP JP17013882A patent/JPS5958674A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5205507A (en) * | 1989-03-15 | 1993-04-27 | Tdk Corporation | Hub for tape cassette |
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