JPH08315539A - Reel for magnetic tape cassette - Google Patents
Reel for magnetic tape cassetteInfo
- Publication number
- JPH08315539A JPH08315539A JP14006495A JP14006495A JPH08315539A JP H08315539 A JPH08315539 A JP H08315539A JP 14006495 A JP14006495 A JP 14006495A JP 14006495 A JP14006495 A JP 14006495A JP H08315539 A JPH08315539 A JP H08315539A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- reel
- curvature
- radius
- lower flange
- 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.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 16
- 238000011109 contamination Methods 0.000 abstract 2
- 239000000696 magnetic material Substances 0.000 description 5
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- 229920005669 high impact polystyrene Polymers 0.000 description 2
- 239000004797 high-impact polystyrene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- -1 polyoxymethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003466 welding 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
-
- 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
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08721—Brakes for tapes or tape reels
-
- 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
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08728—Reels or cores; positioning of the reels in the cassette
Landscapes
- Storage Of Web-Like Or Filamentary Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁気テープカセット用リ
ールに関し、特に、テープ巻装面の上下端にフランジを
備えた高密度の磁気テープや、テープ巻き径が大きくな
る業務用の磁気テープカセットなどに用いられて好適な
磁気テープカセット用リールに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel for a magnetic tape cassette, and more particularly to a high density magnetic tape having flanges on the upper and lower ends of a tape winding surface, and a magnetic tape cassette for business use in which the tape winding diameter is large. The present invention relates to a magnetic tape cassette reel suitable for use in, for example,
【０００２】[0002]
【従来の技術】従来より、ＶＴＲ（ビデオ・テープ・レ
コーダ）などに使用される磁気テープカセットは種々の
形態のものがあるが、この磁気テープカセット内には通
常一対の磁気テープカセット用リールが磁気テープを巻
装して回転自在に収納されている。上記の磁気テープカ
セット用リール４０は、図３に示すごとく周知のように
磁気テープ１０２を巻装する円筒形のテープ巻装胴部４
１の上下に上下フランジ４４、１００が設けられてい
る。そして多くの場合、下フランジ１００はテープ巻装
胴部４１と一体成形され、一方、上フランジ４４は別に
成形されてテープ巻装胴部４１の上端に溶着や嵌着等の
形態によって組み付けられている。これは、次に説明す
るように上下フランジ４４、１００の材質が異なるから
である。2. Description of the Related Art Conventionally, there are various types of magnetic tape cassettes used in VTRs (video tape recorders) and the like, but a pair of reels for magnetic tape cassettes are usually provided in this magnetic tape cassette. It is magnetically wrapped and stored rotatably. As shown in FIG. 3, the reel 40 for the magnetic tape cassette is a cylindrical tape winding body portion 4 around which the magnetic tape 102 is wound, as is well known.
Upper and lower flanges 44 and 100 are provided above and below the unit 1. In many cases, the lower flange 100 is integrally formed with the tape winding body 41, while the upper flange 44 is separately formed and attached to the upper end of the tape winding body 41 by welding, fitting, or the like. There is. This is because the upper and lower flanges 44, 100 are made of different materials, as will be described next.
【０００３】すなわち、下フランジ１００は、その外周
縁にリールブレーキ手段が係合されたり、又、その中心
の係合孔にはＶＴＲの回転駆動軸が係合されたり、上端
中心部分には、磁気テープカセットに設けられて磁気テ
ープカセット用リールをカセット下側に付勢するための
リーフばねが係合される等の理由から機械的強度が要求
されるため、例えばポリオキシメチレン（ＰＯＭ）やハ
イインパクトポリスチレン（ＨＩＰＳ）等の樹脂にて一
体成形されている。That is, the lower flange 100 is engaged with the reel brake means on the outer peripheral edge thereof, the rotation driving shaft of the VTR is engaged with the engagement hole at the center thereof, and the center portion of the upper end thereof is Mechanical strength is required for the reason that a leaf spring provided on the magnetic tape cassette for urging the reel for the magnetic tape cassette is engaged with the magnetic tape cassette. Therefore, for example, polyoxymethylene (POM) or It is integrally molded with resin such as high-impact polystyrene (HIPS).
【０００４】これに対して、上フランジ４４は下フラン
ジほどの強度は要求されず、又、磁気テープの巻装状態
がカセット外部からも目視できるように光透過性である
ことが必要なことなどから、製造コストが比較的廉価な
例えばアクリルニトリル・スチレン共重合体（ＡＳ）や
一般用ポリスチレン（ＧＰＰＳ）など下フランジと異な
る材質で成形されている。On the other hand, the upper flange 44 is not required to have the same strength as the lower flange, and the winding state of the magnetic tape needs to be light-transmitting so that it can be seen from the outside of the cassette. Therefore, it is formed of a material different from that of the lower flange, such as acrylonitrile / styrene copolymer (AS) or general-purpose polystyrene (GPPS), which is relatively inexpensive to manufacture.
【０００５】[0005]
【発明が解決しようとする課題】ところで、図４に示す
ように従来の磁気テープカセット用リール４０の下フラ
ンジ１００は、外周にリールブレーキ手段を係合するた
めの歯１０１が全周にわたって設けられている。磁気テ
ープ１０２と接触する下フランジ１００の内面１０３
は、歯１０１の上端面より上フランジ側に向かって突出
した段差を有する構成（図中においては高くなってい
る）となっている。そして、内面１０３の外周側のエッ
ジ１０４は、リール４０の回転中心軸を通る平面での断
面における曲率半径Ｒ（以下、本明細書ではこの曲率半
径を単に「曲率半径Ｒ」と言う。）を通常０．２ｍｍ程
度で成形されている。By the way, as shown in FIG. 4, the lower flange 100 of the conventional magnetic tape cassette reel 40 is provided with teeth 101 for engaging the reel brake means on the entire outer circumference. ing. Inner surface 103 of lower flange 100 that contacts magnetic tape 102
Has a step (protruded in the figure) having a step protruding from the upper end surface of the tooth 101 toward the upper flange side. Then, the edge 104 on the outer peripheral side of the inner surface 103 has a radius of curvature R in a cross section in a plane passing through the rotation center axis of the reel 40 (hereinafter, this radius of curvature is simply referred to as “curvature radius R”). Usually, it is formed with a thickness of about 0.2 mm.
【０００６】一方、ビデオテープカセット等では、ＶＴ
Ｒに装填された状態において、磁気テープ１０２がカセ
ット外に大きく引き出されている状態となるため、特
に、磁気テープ１０２の巻き出し又は巻取り時のように
テープ走行速度が早い場合には、磁気テープ１０２がテ
ープ幅方向（図中では上下）に振れることによって問題
が生じた。すなわち、磁気テープ１０２が下側（下フラ
ンジ側）に振れたときには、磁気テープ１０２の下端縁
１０５が下フランジ１００のエッジ１０４に接触する。
このとき、従来はエッジ１０４の曲率半径Ｒが前述のよ
うに０．２ｍｍ程度と非常に小さかったので、磁気テー
プ１０２の下端縁１０５がエッジ１０４で擦られて、磁
気テープ１０２に塗布された磁性体が脱落してしまった
り、あるいは磁気テープ１０２自体がそのベース共々損
傷したりする危険性があった。On the other hand, in a video tape cassette or the like, the VT
In the state of being loaded in the R, the magnetic tape 102 is in a state of being largely pulled out of the cassette. Therefore, particularly when the tape running speed is high such as when the magnetic tape 102 is unwound or wound up, A problem was caused by the tape 102 swinging in the tape width direction (up and down in the drawing). That is, when the magnetic tape 102 swings to the lower side (lower flange side), the lower edge 105 of the magnetic tape 102 contacts the edge 104 of the lower flange 100.
At this time, conventionally, the radius of curvature R of the edge 104 is as small as about 0.2 mm as described above, so the lower edge 105 of the magnetic tape 102 is rubbed by the edge 104 and the magnetic force applied to the magnetic tape 102 is reduced. There is a risk that the body may fall off, or the magnetic tape 102 itself may be damaged together with its base.
【０００７】そこで、エッジ１０４の曲率半径を、例え
ば６〜１０ｍｍというように、大きくすれば上記問題は
解決できるように推測できるが、実際にこの曲率を大き
くしたり、さらには内面１０３をエッジ１０４に向かっ
て段差の無いように連続した傾斜面に構成しても、さほ
ど問題が解消されないどころか、かえって磁気テープ１
０２の損傷などが酷くなる結果となってしまった。特
に、昨今は磁気テープカセットの磁気テープを早送り又
は巻戻しする際のテープ搬送速度が益々速くなってきて
おり、この種の問題は深刻になってきている。加えて近
年においては高密度記録にとなってきていることから、
上記磁性体の僅かな脱落によってもドロップアウトを誘
発するために、カセット性能上この種の問題は極めて大
きな問題となってきている。Therefore, it can be inferred that the above problem can be solved by increasing the radius of curvature of the edge 104, for example, 6 to 10 mm. However, this curvature is actually increased, and furthermore, the inner surface 103 of the edge 104 is made larger. Even if it is configured with a continuous inclined surface so that there is no step toward the end, the problem is not solved so much, on the contrary, the magnetic tape 1
The damage of 02 etc. became severe. Particularly, in recent years, the tape transport speed at the time of fast-forwarding or rewinding the magnetic tape of the magnetic tape cassette has been increasing more and more, and this kind of problem has become serious. In addition, since high density recording has been achieved in recent years,
Since a dropout is induced by even a slight drop of the magnetic material, this kind of problem has become an extremely serious problem in cassette performance.
【０００８】本発明は、上記課題に鑑みてなされたもの
であり、磁気テープの磁性体が脱落したり、磁気テープ
自体が損傷したりするのを防止可能な磁気テープカセッ
ト用リールを提供することを目的とするものである。The present invention has been made in view of the above problems, and provides a reel for a magnetic tape cassette capable of preventing the magnetic body of the magnetic tape from falling off or damaging the magnetic tape itself. The purpose is.
【０００９】[0009]
【課題を解決するための手段】本発明者らは上記問題に
ついて鋭意研究の結果、その解決手段を見出したもので
ある。すなわち、本発明のかかる目的は、磁気テープが
巻装される円筒形のテープ巻装面及び該テープ巻装面の
上下端に上下フランジが設けられ、前記下フランジの外
周に歯が設けられた磁気テープカセット用リールにおい
て、前記下フランジの歯以外の内面が前記歯の端面より
も上フランジ側に突出するように構成されており、さら
に前記歯以外の内面の外周エッジの、前記リールの回転
中心軸を通る平面での断面における曲率半径が１〜４ｍ
ｍの範囲にあることを特徴とする磁気テープカセット用
リールにより達成される。Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the above problems, and have found a solution to the problems. That is, the object of the present invention is to provide a cylindrical tape winding surface around which a magnetic tape is wound, upper and lower flanges on the upper and lower ends of the tape winding surface, and teeth on the outer periphery of the lower flange. In the reel for magnetic tape cassette, the inner surface other than the teeth of the lower flange is configured to protrude toward the upper flange side from the end surface of the teeth, and further, the rotation of the reel at the outer peripheral edge of the inner surface other than the teeth. The radius of curvature in a cross section on a plane passing through the central axis is 1 to 4 m
It is achieved by a reel for a magnetic tape cassette characterized by being in the range of m.
【００１０】また、本発明のより好ましい実施態様とし
ては、前記外周エッジの曲率半径が１．５〜３ｍｍの範
囲とされる。As a more preferred embodiment of the present invention, the radius of curvature of the outer peripheral edge is in the range of 1.5 to 3 mm.
【００１１】[0011]
【作用】本発明の磁気テープカセット用リールは、下フ
ランジの歯以外の内面の外周エッジが１〜４ｍｍの範
囲、より好ましくは１．５〜３ｍｍの範囲という特定の
範囲の曲率半径Ｒで形成されていることで、この数値の
下限値においては、磁気テープが下側に振れて内面の外
周エッジに接触しても従来よりも広い範囲で擦られるだ
けで局部的に擦られることを回避できる作用を発揮し、
これに加えて、数値の上限値においては、外周エッジの
部分の段差を無くすような傾斜構造に近づけ過ぎること
で磁気テープエッジと前記歯のエッジとの接触を許容し
てしまうことを回避できる作用を発揮できるものと推測
される。In the reel for magnetic tape cassette of the present invention, the outer peripheral edge of the inner surface other than the teeth of the lower flange is formed with a radius of curvature R in a specific range of 1 to 4 mm, more preferably 1.5 to 3 mm. Therefore, at the lower limit of this value, even if the magnetic tape swings downward and contacts the outer peripheral edge of the inner surface, it is possible to avoid local rubbing by only rubbing in a wider range than before. Exerts an action,
In addition to this, at the upper limit of the numerical value, it is possible to avoid allowing contact between the magnetic tape edge and the tooth edge by approaching the inclined structure so as to eliminate the step at the outer peripheral edge portion. It is presumed that it can exhibit.
【００１２】[0012]
【実施態様】以下、本発明に係わる磁気テープカセット
用リールの一実施態様について、図１乃至図２を参照し
て説明する。図１は本発明に係わる磁気テープカセット
用リールの要部（図２のＡ部分）拡大断面図、図２は本
発明に係わる磁気テープカセット用リールを具備した磁
気テープカセットの要部断面図である。なお、説明の都
合上、まず図２を参照して磁気テープカセットおよび磁
気テープカセット用リールの全体構成を説明し、次に図
１を参照して下フランジについて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a magnetic tape cassette reel according to the present invention will be described below with reference to FIGS. FIG. 1 is an enlarged cross-sectional view of a main part (portion A in FIG. 2) of a magnetic tape cassette reel according to the present invention, and FIG. 2 is a main-part cross-sectional view of a magnetic tape cassette equipped with a magnetic tape cassette reel according to the present invention. is there. For convenience of description, first, the overall structure of the magnetic tape cassette and the reel for the magnetic tape cassette will be described with reference to FIG. 2, and then the lower flange will be described with reference to FIG.
【００１３】図２に示すように、本発明による磁気テー
プカセット用リール１を一対備えた磁気テープカセット
２００は、そのカセット底面に磁気テープカセット用リ
ール１に対応した，記録再生装置の回転駆動軸を挿入す
るための開口２０３を備え、カセット前方側には磁気テ
ープ２を図示しない引き出しピン（図示のガイドピン２
１０はテープパスを形成するガイドピン）によって引き
出し可能な前面開口部２０４を開閉自在とするガードパ
ネル２０１を備えている。磁気テープカセット用リール
１は、磁気テープ２を巻装する円筒形のテープ巻装胴部
１１（芯部）が設けられ、その中央部に例えばＶＴＲな
どの回転駆動軸（図示せず）に係合する係合孔１２が設
けられている。テープ巻装胴部１１の下端には、下フラ
ンジ１３が一体成形されている。一方、テープ巻装胴部
１１の上端には、別に成形された透明な上フランジ１４
が固着されている。磁気テープ２は通常、その下端が図
示のごとく下フランジ１３の内面１６に当接し、上フラ
ンジ１４と磁気テープ２との間には僅かな隙間ができる
ように巻装される。As shown in FIG. 2, a magnetic tape cassette 200 having a pair of magnetic tape cassette reels 1 according to the present invention is a rotary drive shaft of a recording / reproducing apparatus corresponding to the magnetic tape cassette reel 1 on the bottom surface of the cassette. An opening 203 for inserting the magnetic tape 2 is provided on the front side of the cassette.
10 is provided with a guard panel 201 that can open and close a front opening 204 that can be pulled out by a guide pin that forms a tape path. The magnetic tape cassette reel 1 is provided with a cylindrical tape winding body portion 11 (core portion) around which the magnetic tape 2 is wound, and a rotary drive shaft (not shown) such as a VTR is provided in the center portion thereof. A mating engagement hole 12 is provided. A lower flange 13 is integrally formed on the lower end of the tape winding body 11. On the other hand, at the upper end of the tape winding body portion 11, a separately formed transparent upper flange 14 is formed.
Is stuck. The magnetic tape 2 is normally wound so that the lower end thereof abuts the inner surface 16 of the lower flange 13 as shown in the drawing, and a slight gap is formed between the upper flange 14 and the magnetic tape 2.
【００１４】下フランジ１３の外周には、図１に示すよ
うにＶＴＲのリールブレーキ機構（図示せず）を係合す
るための歯１５が、全周に亘って設けられている。上述
した構成は従来と同様であるが、本発明による磁気テー
プカセット用リール１の特徴的構成は、同図に示すよう
に磁気テープ２が当接する下フランジ１３の内面１６
が、歯１５の上端面１７より段差をもって高くなってお
り、下フランジ１３の内面１６の外周側のエッジ１８
が、所定の範囲の曲率半径Ｒで形成されている。本実施
態様では、曲率半径Ｒ＝１〜４ｍｍに設定され、好まし
くは曲率半径Ｒ＝１．５〜３ｍｍに設定されている。As shown in FIG. 1, teeth 15 for engaging a reel brake mechanism (not shown) of the VTR are provided on the outer circumference of the lower flange 13 over the entire circumference. The above-mentioned structure is the same as the conventional one, but the characteristic structure of the magnetic tape cassette reel 1 according to the present invention is that the inner surface 16 of the lower flange 13 against which the magnetic tape 2 abuts, as shown in FIG.
Is higher than the upper end surface 17 of the tooth 15 with a step, and the edge 18 on the outer peripheral side of the inner surface 16 of the lower flange 13 is
Are formed with a radius of curvature R within a predetermined range. In the present embodiment, the radius of curvature R is set to 1 to 4 mm, and preferably the radius of curvature R is set to 1.5 to 3 mm.
【００１５】このように、下フランジ１３の内面１６の
エッジ１８を、所定の範囲の曲率半径Ｒで形成すること
により、次に説明するように、磁気テープ２が上下に振
れて巻き出し又は巻取られた場合でも、磁気テープ２に
塗布された磁性体が剥がれたり、或いは磁気テープ２自
体が損傷したりするのを防止することができる。By thus forming the edge 18 of the inner surface 16 of the lower flange 13 with a radius of curvature R in a predetermined range, the magnetic tape 2 is swung up and down to be unwound or wound, as will be described below. Even when the magnetic tape 2 is removed, it is possible to prevent the magnetic material applied to the magnetic tape 2 from being peeled off or the magnetic tape 2 itself from being damaged.
【００１６】次に、磁気テープカセット２００に一対の
テープリールを使用したとき、そのエッジ１８の曲率半
径Ｒを０〜５．０ｍｍの範囲で変えた９種類のリールに
ついて、磁気テープ２を巻き出し及び巻取りを行なった
ときに、磁気テープカセット用リール１の内面の汚れ状
態と、磁気テープ２のダメージがどうなるかを観察した
結果を示す。なお、テープリールのその他の仕様は以下
の通りである。テープ巻装面は高さが１３．３ｍｍで直
径が３６ｍｍ、上下フランジの直径は１２２．５ｍｍ、
下フランジの歯のリール半径方向の長さは０．５ｍｍ
で、歯の上面と下フランジの内面との段差は０．２ｍ
ｍ。なお、このテストでは、早送り（ＦＦ）及び巻取り
（ＲＥＷ）を各々１０００回行なった後に、リールの下
フランジ１３の汚れ及び磁気テープ下端の物理的損傷を
目視観察し、下記判定基準で評価した。実用上、許容で
きるのはＡとＢである。結果を表１に示す。表１におけ
る各評価については、Ａは「下フランジの汚れが全くな
く、磁気テープ下端の損傷もない。」、Ｂは「下フラン
ジの外周エッジが部分的に汚れているが、テープ下端の
損傷はない。」、Ｃは「下フランジの外周エッジが全周
にわたって汚れているが、テープ下端の損傷はな
い。」、Ｄは「下フランジの外周エッジが全周にわたっ
て汚れている上、テープ下端の損傷も見い出された。」
という判定基準とした。Next, when a pair of tape reels is used in the magnetic tape cassette 200, the magnetic tape 2 is unwound on nine types of reels in which the radius of curvature R of the edge 18 is changed in the range of 0 to 5.0 mm. The results of observing how the magnetic tape 2 is damaged and the inner surface of the magnetic tape cassette reel 1 being soiled and the magnetic tape 2 being damaged are shown. The other specifications of the tape reel are as follows. The tape winding surface has a height of 13.3 mm and a diameter of 36 mm, and the upper and lower flanges have a diameter of 122.5 mm.
The length of the lower flange tooth in the radial direction of the reel is 0.5 mm
And the step between the upper surface of the tooth and the inner surface of the lower flange is 0.2m.
m. In this test, after performing fast forward (FF) and winding (REW) 1000 times, stains on the lower flange 13 of the reel and physical damage on the lower end of the magnetic tape were visually observed and evaluated according to the following criteria. . Practically acceptable are A and B. The results are shown in Table 1. Regarding each evaluation in Table 1, A is "the bottom flange is completely free of dirt and the lower end of the magnetic tape is not damaged.", B is "the outer edge of the lower flange is partially dirty, but the bottom end of the tape is damaged. No. ", C" The outer edge of the lower flange is dirty all around, but the bottom edge of the tape is not damaged. ", D is" The outer edge of the lower flange is all around, and the bottom edge of the tape is damaged. Damage was also found. "
Was used as the criterion.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１から分かるように、エッジ１８の曲率
半径Ｒ＝５．０ｍｍの場合は、テープダメージは見られ
なかったものの、下フランジの外周が全周にわたって汚
れていた。このように曲率半径Ｒが大き過ぎると、エッ
ジ１８がテーパ面に近くなってしまい、下フランジ１３
の歯１５の上端面１７のエッジに磁気テープ２が接触す
る結果であろうか、これによって、磁気テープ２が局部
的に擦られて磁性体が剥がされ、この磁性体がリールに
付着して汚れが生じたものと考えられる。As can be seen from Table 1, when the radius of curvature R of the edge 18 was 5.0 mm, no tape damage was observed, but the outer circumference of the lower flange was dirty over the entire circumference. If the radius of curvature R is too large in this way, the edge 18 becomes close to a tapered surface, and the lower flange 13
Perhaps this is the result of the magnetic tape 2 coming into contact with the edge of the upper end surface 17 of the tooth 15 of this, and this causes the magnetic tape 2 to be locally rubbed and the magnetic substance peeled off, and this magnetic substance adheres to the reel and becomes dirty. Is considered to have occurred.
【００１９】曲率半径Ｒ＝４．０ｍｍの場合は、下フラ
ンジの外周エッジが部分的に汚れている程度の微量であ
り、テープダメージは見られなかった。曲率半径Ｒ＝
３．０ｍｍの場合と、曲率半径Ｒ＝１．５ｍｍの場合
は、下フランジの外周に汚れが全くなく、テープダメー
ジも見られなかった。曲率半径Ｒ＝１．０ｍｍの場合
は、下フランジの外周エッジが部分的に汚れる程度であ
って、テープダメージは見られなかった。このことか
ら、曲率半径Ｒ＝１．０〜４．０ｍｍの場合は、曲率半
径Ｒ＝５．０ｍｍの場合のように大き過ぎないので、磁
気テープ２が歯１５のエッジに接触することがなく、ま
た小さ過ぎることもないので、磁気テープ２が局部的に
擦られることがないため、下フランジの外周エッジに汚
れがないか微量であり、テープダメージもなかったと考
えられる。特に曲率半径Ｒ＝１．５〜３．０ｍｍの場合
は、下フランジの外周エッジの汚れもテープダメージも
全くなく、非常に好ましい結果が得られた。When the radius of curvature R = 4.0 mm, the outer peripheral edge of the lower flange was slightly soiled, and no tape damage was observed. Radius of curvature R =
In the case of 3.0 mm and the radius of curvature R = 1.5 mm, the outer circumference of the lower flange was not contaminated at all and no tape damage was observed. When the radius of curvature R was 1.0 mm, the outer peripheral edge of the lower flange was only partially soiled, and no tape damage was observed. From this, when the radius of curvature R = 1.0 to 4.0 mm, it is not too large as in the case of the radius of curvature R = 5.0 mm, so that the magnetic tape 2 does not contact the edge of the tooth 15. Moreover, since it is not too small, the magnetic tape 2 is not locally rubbed, and therefore it is considered that the outer peripheral edge of the lower flange has no stain or a small amount, and the tape is not damaged. In particular, when the radius of curvature R was 1.5 to 3.0 mm, there were no stains on the outer peripheral edge of the lower flange and no tape damage, and very favorable results were obtained.
【００２０】曲率半径Ｒ＝０．５ｍｍ又は０．３ｍｍの
場合は、下フランジの外周エッジが全周にわたって汚れ
てしまった。このように、曲率半径Ｒが小さくなると、
磁気テープ２が局部的に擦られて磁性体が剥がれたり、
磁気テープ２自体が損傷すると考えられる。曲率半径Ｒ
＝０．２ｍｍの場合、及び曲率半径Ｒ＝０ｍｍの場合に
は、下フランジの外周エッジの汚れが大きく、テープダ
メージも大きかった。したがって、曲率半径Ｒ＝０．５
ｍｍ以下では実用に適さない。When the radius of curvature R = 0.5 mm or 0.3 mm, the outer peripheral edge of the lower flange was soiled over the entire circumference. Thus, when the radius of curvature R becomes smaller,
The magnetic tape 2 is locally rubbed and the magnetic material is peeled off,
It is considered that the magnetic tape 2 itself is damaged. Radius of curvature R
= 0.2 mm and a radius of curvature R = 0 mm, the outer edge of the lower flange was heavily soiled and the tape was damaged. Therefore, the radius of curvature R = 0.5
If it is less than mm, it is not suitable for practical use.
【００２１】このテスト結果から、曲率半径Ｒ＝１．０
〜４，０ｍｍが実用に適していると判断され、その中で
も曲率半径Ｒ＝１．５〜３．０ｍｍがより好ましい。上
述のように、本発明の磁気テープカセット用リール１
は、リール汚れ及びテープダメージを防止することがで
きるので、磁性体が多く塗布されている高密度磁気テー
プや、磁気テープ２の巻き径が大きくなる業務用の磁気
テープカセット用リールに特に適している。From this test result, the radius of curvature R = 1.0
.About.40 mm is judged to be suitable for practical use, and the radius of curvature R = 1.5 to 3.0 mm is more preferable. As described above, the reel 1 for the magnetic tape cassette of the present invention
Since it can prevent reel dirt and tape damage, it is particularly suitable for a high-density magnetic tape coated with a large amount of magnetic material and a commercial magnetic tape cassette reel in which the winding diameter of the magnetic tape 2 becomes large. There is.
【００２２】[0022]
【発明の効果】以上述べたように、本発明の磁気テープ
カセット用リールは、下フランジの内面の外周エッジが
１〜４ｍｍの範囲の曲率半径、好ましくは１．５〜３ｍ
ｍの範囲の曲率半径という特定の範囲の曲率半径で形成
されているので、磁気テープが上下に振れる挙動変化に
伴って外周エッジまたは歯による磁気テープのテープエ
ッジの局部的な擦れが回避され、これによって、磁気テ
ープに塗布されている磁性体が脱落や剥がれ落ちがな
く、リールが汚れたり、磁気テープの端縁が損傷したり
するのを防止できる。As described above, in the reel for magnetic tape cassette of the present invention, the outer peripheral edge of the inner surface of the lower flange has a radius of curvature in the range of 1 to 4 mm, preferably 1.5 to 3 m.
Since it is formed with a radius of curvature of a specific range, that is, a radius of curvature of m, local rubbing of the tape edge of the magnetic tape by the outer peripheral edge or the teeth is avoided along with the behavior change of the magnetic tape swinging up and down, As a result, the magnetic material applied to the magnetic tape does not fall off or peel off, and it is possible to prevent the reel from becoming dirty and the edge of the magnetic tape from being damaged.
【図１】本発明に係わる磁気テープカセット用リールの
下フランジの外周部を示す拡大図である。FIG. 1 is an enlarged view showing an outer peripheral portion of a lower flange of a reel for a magnetic tape cassette according to the present invention.
【図２】磁気テープカセット用リールの構成を示す断面
図である。FIG. 2 is a cross-sectional view showing a configuration of a magnetic tape cassette reel.
【図３】従来例の磁気テープカセット用リールの断面図
である。FIG. 3 is a cross-sectional view of a conventional magnetic tape cassette reel.
【図４】従来例の磁気テープカセット用リールにおける
下フランジの外周部の拡大図である。FIG. 4 is an enlarged view of an outer peripheral portion of a lower flange in a conventional magnetic tape cassette reel.
１ 磁気テープカセット用リール ２、１０２ 磁気テープ １３、１００ 下フランジ １４ 上フランジ １５、１０１ 歯 １６、１０３ 内面 １８、１０４ エッジ ２００ 磁気テープカセット 1 Magnetic Tape Cassette Reel 2,102 Magnetic Tape 13,100 Lower Flange 14 Upper Flange 15,101 Teeth 16,103 Inner Surface 18,104 Edge 200 Magnetic Tape Cassette
Claims (1)
巻装面及び該テープ巻装面の上下端に上下フランジが設
けられ、前記下フランジの外周に歯が設けられた磁気テ
ープカセット用リールにおいて、 前記下フランジの歯以外の内面が前記歯の端面よりも上
フランジ側に突出するように構成されており、さらに前
記歯以外の内面の外周エッジの、前記リールの回転中心
軸を通る平面での断面における曲率半径が１〜４ｍｍの
範囲にあることを特徴とする磁気テープカセット用リー
ル。1. A magnetic tape cassette having a cylindrical tape winding surface around which a magnetic tape is wound, upper and lower flanges provided at the upper and lower ends of the tape winding surface, and teeth provided on the outer periphery of the lower flange. In the reel, the inner surface other than the teeth of the lower flange is configured to project toward the upper flange side from the end surface of the teeth, and further passes the rotation center axis of the reel at the outer peripheral edge of the inner surface other than the teeth. A magnetic tape cassette reel having a radius of curvature in a plane section of 1 to 4 mm.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14006495A JP3464312B2 (en) | 1995-05-16 | 1995-05-16 | Reel for magnetic tape cassette |
| GB9608556A GB2300850B (en) | 1995-05-16 | 1996-04-25 | Reel for magnetic tape cassette |
| DE1996119716 DE19619716A1 (en) | 1995-05-16 | 1996-05-15 | Magnetic tape cassette spool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14006495A JP3464312B2 (en) | 1995-05-16 | 1995-05-16 | Reel for magnetic tape cassette |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08315539A true JPH08315539A (en) | 1996-11-29 |
| JP3464312B2 JP3464312B2 (en) | 2003-11-10 |
Family
ID=15260145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14006495A Expired - Fee Related JP3464312B2 (en) | 1995-05-16 | 1995-05-16 | Reel for magnetic tape cassette |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3464312B2 (en) |
| DE (1) | DE19619716A1 (en) |
| GB (1) | GB2300850B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150131971A (en) * | 2014-05-15 | 2015-11-25 | 가부시키가이샤 무라타 세이사쿠쇼 | Reel for a taped series of electronic components and method of manufacturing the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10051010A1 (en) | 2000-10-14 | 2002-04-18 | Klauke Gmbh Gustav | Force-measuring tool e.g. for pressing terminal ends, has combined levers matched to press head geometry of press head and acting on pressure sensor |
| JP2005302168A (en) * | 2004-04-13 | 2005-10-27 | Fuji Photo Film Co Ltd | Leader tape and magnetic tape cartridge using the same |
-
1995
- 1995-05-16 JP JP14006495A patent/JP3464312B2/en not_active Expired - Fee Related
-
1996
- 1996-04-25 GB GB9608556A patent/GB2300850B/en not_active Expired - Fee Related
- 1996-05-15 DE DE1996119716 patent/DE19619716A1/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150131971A (en) * | 2014-05-15 | 2015-11-25 | 가부시키가이샤 무라타 세이사쿠쇼 | Reel for a taped series of electronic components and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2300850A (en) | 1996-11-20 |
| GB2300850B (en) | 1997-07-02 |
| GB9608556D0 (en) | 1996-07-03 |
| DE19619716A1 (en) | 1996-12-12 |
| JP3464312B2 (en) | 2003-11-10 |
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