JP2517008B2 - Method of manufacturing rotating magnetic head drum - Google Patents
Method of manufacturing rotating magnetic head drumInfo
- Publication number
- JP2517008B2 JP2517008B2 JP62264412A JP26441287A JP2517008B2 JP 2517008 B2 JP2517008 B2 JP 2517008B2 JP 62264412 A JP62264412 A JP 62264412A JP 26441287 A JP26441287 A JP 26441287A JP 2517008 B2 JP2517008 B2 JP 2517008B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- fixed drum
- drum
- running surface
- magnetic head
- 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
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はヘリカルスキャン方式のVTRにおける回転磁
気ヘッドドラムの製造方法に関し、特にその固定ドラム
の製造工程において磁気テープの入側端部及び出側端部
に突出する突部の形成方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotary magnetic head drum in a helical scan type VTR, and particularly, in the manufacturing process of a fixed drum thereof, an end portion and an end portion of a magnetic tape. The present invention relates to a method of forming a protruding portion that protrudes inward.
従来の技術 ヘリカルスキャン方式のVTRにおいては、固定ドラム
とその上に微小な間隙を設けて配置された回転ドラムと
から成る磁気ヘッドドラムの外周に、磁気テープを固定
ドラムに形成したヘリカルな走行面に沿って180゜〜270
゜巻回した状態で摺動走行させるとともに、前記回転ド
ラムに180゜間隔又は90゜間隔で２個又は４個取付けた
磁気ヘッドを前記間隙から僅かに突出させた状態で回転
ドラムを高速回転させて、磁気ヘッドにて磁気テープに
対して記録再生するように構成されている。Conventional technology In a helical scan type VTR, a magnetic tape is formed on a fixed drum on the outer circumference of a magnetic head drum consisting of a fixed drum and a rotary drum arranged with a minute gap above it. 180 ° to 270 along
Rotate the rotating drum at a high speed while slidingly running in a state of being wound around, and with two or four magnetic heads attached to the rotating drum at 180 ° intervals or 90 ° intervals slightly protruding from the gap. The magnetic head is configured to record and reproduce on the magnetic tape.
このように、磁気ヘッドが磁気テープの走行面から僅
かに突出しているため、磁気ヘッドが磁気テープとの接
触を開始する瞬間と磁気テープから離脱する瞬間に、磁
気ヘッドによって磁気テープの側縁に衝撃が加えられる
ことになり、そのため磁気テープに振動を生じて再生時
にジッターを生じたり、磁気ヘッドによる磁気テープの
たたき音が発生し、それがVTR一体型のカメラの場合に
大きな雑音として録音されてしまうなどの問題があっ
た。In this way, since the magnetic head slightly projects from the running surface of the magnetic tape, the magnetic head moves to the side edge of the magnetic tape at the moment when the magnetic head starts contact with the magnetic tape and at the moment when the magnetic head leaves the magnetic tape. Shock is applied, which causes vibrations on the magnetic tape and causes jitters during playback, and a magnetic tape tapping sound is generated by the magnetic head, which is recorded as large noise in the case of a VTR-integrated camera. There were problems such as being lost.
このような問題点を解消するため、例えば特開昭58−
6547号公報においては、固定ドラムのテープ走行面のテ
ープ入側端部又は出側端部における磁気テープと磁気ヘ
ッドの接触開始位置又は離脱位置の近傍に、磁気テープ
を半径方向に突き出す小片を設けた回転磁気ヘッドドラ
ムが提案されている。In order to solve such a problem, for example, JP-A-58-
In Japanese Patent No. 6547, a small piece for radially projecting the magnetic tape is provided in the vicinity of a contact start position or a detachment position of the magnetic head and the magnetic head at the tape entrance side end or the tape exit side end of the tape running surface of the fixed drum. A rotating magnetic head drum has been proposed.
又、特開昭62−132257号公報には、固定ドラムの磁気
テープの走行面のテープ離脱側に突部を設けたものが開
示されている。Further, JP-A-62-132257 discloses a fixed drum provided with a protrusion on the tape detaching side of the running surface of the magnetic tape.
発明が解決しようとする問題点 ところが、特開昭58−6547号公報に開示された手段で
は、小片を突出させて取り付けるたに微小で精度の高い
部品が必要となるとともに、組立て工数も増加するた
め、コスト高となるという問題がある。The problem to be solved by the invention is that the means disclosed in Japanese Patent Laid-Open No. 58-6547 requires minute and highly accurate parts for protruding and mounting small pieces, and also increases the number of assembly steps. Therefore, there is a problem that the cost becomes high.
一方、特開昭62−132257号公報に開示れた手段では、
テープ走行面を加工する際に突部を削り残すことによっ
て形成しているが、磁気テープの入側ではテープ走行面
の幅が小さいので、加工上の制約から突部を形成するこ
とができず、磁気テープの出側にしか突部を形成できな
いという問題がある。On the other hand, in the means disclosed in JP-A-62-132257,
It is formed by leaving the protrusions uncut when processing the tape running surface, but since the width of the tape running surface is small on the entry side of the magnetic tape, it is not possible to form the projection due to processing restrictions. However, there is a problem that the protrusion can be formed only on the exit side of the magnetic tape.
本発明は上記従来の問題点に鑑み、磁気テープの入側
と出側の両方に突部を形成した固定ドラムを安価に製造
できる回転磁気ヘッドドラムの製造方法を提供すること
を目的とする。In view of the above conventional problems, it is an object of the present invention to provide a method for manufacturing a rotary magnetic head drum that can inexpensively manufacture a fixed drum having protrusions formed on both the input side and the output side of a magnetic tape.
問題点を解決するための手段 本発明の第１発明は、上記目的を達成するため、ヘリ
カルスキャン方式のVTRにおける回転磁気ヘッドドラム
の固定ドラムの製造工程において、固定ドラムの外周に
磁気テープの走行面を形成した後、この走行面における
磁気テープ入側端部の上縁近傍と磁気テープ出側端部の
上縁近傍に、固定ドラムの内側からの加圧成形にて突部
を突出形成することを特徴とする。Means for Solving the Problems In order to achieve the above-mentioned object, the first invention of the present invention, in the manufacturing process of the fixed drum of the rotary magnetic head drum in the helical scan type VTR, runs the magnetic tape around the fixed drum. After forming the surface, a protrusion is formed by pressure molding from the inside of the fixed drum in the vicinity of the upper edge of the magnetic tape entrance side end and in the vicinity of the upper edge of the magnetic tape exit side end of this running surface. It is characterized by
又、本発明の第２発明は、軸心回りに回転する成形工
具を固定ドラムの内側から加圧して突部を突出形成する
ことを特徴とする。A second aspect of the present invention is characterized in that the molding tool rotating about the axis is pressed from the inside of the fixed drum to form the protrusion.
さらに、本発明の第３発明は、固定ドラムの軸心と平
行な軸心回りに、磁気テープ入側端部では磁気テープの
走行方向と反対方向に、磁気テープ出側端部では磁気テ
ープの走行方向と同一方向にそれぞれ回転させた成形工
具を固定ドラムの内側から加圧して突部を突出形成する
ことを特徴とする。Further, according to a third aspect of the present invention, about the axis parallel to the axis of the fixed drum, the magnetic tape entry side end portion is opposite to the running direction of the magnetic tape, and the magnetic tape exit side end portion of the magnetic tape. It is characterized in that the molding tool rotated in the same direction as the traveling direction is pressed from the inside of the fixed drum to form the protrusion.
作用 本発明の第１発明では、上記のように突部を固定ドラ
ムの内側から加圧成形するので、磁気テープの入側と出
側の両方に容易に突部を形成できるとともに、別部品等
を必要としないので安価に形成できる。Effect In the first aspect of the present invention, since the protrusion is pressure-molded from the inside of the fixed drum as described above, it is possible to easily form the protrusion on both the inlet side and the outlet side of the magnetic tape, and separate parts and the like. Since it is not necessary, it can be formed at low cost.
又、本発明の第２発明によれば、成形工具をその軸心
回りに回転させながら加圧成形することによって、磁気
ヘッドが通過する間隙を形成している固定ドラムの上端
面に盛り上がりを生じることなく、またテープ走行面の
真円度及び突部の表面荒さを確保しながら突部を形成す
ることができ、さらにスプリングバックが小さいため突
出量を正確に規制することができるとともに容易に変更
することができる。Further, according to the second aspect of the present invention, the molding tool is pressure-molded while being rotated about its axis, so that the upper end surface of the fixed drum, which forms the gap through which the magnetic head passes, rises. Of the tape, the protrusion can be formed while ensuring the roundness of the tape running surface and the surface roughness of the protrusion, and the springback is small, so the amount of protrusion can be accurately regulated and easily changed. can do.
さらに、本発明の第３発明によれば、成形工具の回転
方向を規定することによって、形成する突部の形状を、
磁気テープ巻回部に近い部分をなだらかな形状とするこ
とができ、磁気テープが滑らかにテープ走行面に接触し
て行くとともにテープ走行面から離脱して行き、さらに
ジッターのない再生が可能となるとともに磁気ヘッドに
よる磁気テープのたたき音を無くすことができる。Further, according to the third aspect of the present invention, the shape of the protrusion formed by defining the rotation direction of the forming tool is
The part close to the winding part of the magnetic tape can be made into a gentle shape, and the magnetic tape smoothly comes into contact with the tape running surface and separates from the tape running surface, which enables further reproduction without jitter. At the same time, the tapping sound of the magnetic tape by the magnetic head can be eliminated.
実施例 以下、本発明の一実施例を第１図〜第５図を参照しな
がら説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.
第１図、第４図及び第５図において、１は回転磁気ヘ
ッドドラムの固定ドラムで、アルミニウム合金の鋳造品
にて構成されている。２は、この固定ドラムの外周面に
切削加工にて形成されたヘリカル状のテープ走行面であ
る。In FIGS. 1, 4, and 5, reference numeral 1 denotes a fixed drum of the rotary magnetic head drum, which is made of a cast aluminum alloy. Reference numeral 2 denotes a helical tape running surface formed by cutting on the outer peripheral surface of the fixed drum.
この固定ドラム１のテープ走行面２には、第４図に示
すように、略270゜の範囲にわたって磁気テープ３が巻
回される。この磁気テープ３は、テープ走行面２に対し
て接触を開始する入側端部で磁気テープ３の下縁から接
触を開始し、テープ走行面２から離脱するテープ走行面
２の出側端部で磁気テープ３の上縁までテープ走行面に
接触するようにヘリカルに巻回されている。As shown in FIG. 4, the magnetic tape 3 is wound on the tape running surface 2 of the fixed drum 1 over a range of about 270 °. The magnetic tape 3 starts contact from the lower edge of the magnetic tape 3 at the entrance side end where it starts contact with the tape running surface 2, and exits from the tape running surface 2 at the exit side end of the tape running surface 2. Is helically wound up to the upper edge of the magnetic tape 3 so as to contact the tape running surface.
そして、前記テープ走行面２の入側端部と出側端部の
上端部には、磁気テープ３をテープ走行面２から浮き上
がらせるように径方向に押し出す突部４、５が突出形成
されている。この突部４、５位置はテープ走行面２に対
する磁気テープ３の接触開始点と離脱点から角度で数度
の位置に配置されている。又、この突部４、５と突出量
は、例えば50〜70μｍ程度であり、この突部４、５にて
テープ走行面２の入側端部及び出側端部の上端部で磁気
テープ３の下縁及び上縁をテープ走行面２から浮き上が
らせ、テープ走行面２から20〜30μｍ突出している磁気
ヘッドが衝撃的に磁気テープ３の下縁と接触したり上縁
から離脱したりするのを防止し、磁気テープ３に振動を
生じるのを防止している。Further, at the upper ends of the entrance side and the exit side of the tape running surface 2, there are formed projections 4 and 5 for pushing out the magnetic tape 3 in the radial direction so as to lift the magnetic tape 3 from the tape running surface 2. There is. The positions of the protrusions 4 and 5 are arranged at a few degrees in angle from the contact start point and the contact point of the magnetic tape 3 with respect to the tape running surface 2. Further, the protrusions 4 and 5 and the protrusion amount are, for example, about 50 to 70 μm, and the magnetic tape 3 is formed at the upper ends of the entrance side and the exit side end of the tape running surface 2 at the protrusions 4 and 5. The lower edge and the upper edge are lifted up from the tape running surface 2 so that the magnetic head projecting 20 to 30 μm from the tape running surface 2 impacts with the lower edge of the magnetic tape 3 or separates from the upper edge. To prevent the magnetic tape 3 from vibrating.
次に、上記突部４、５の形成方法について、第１図〜
第３図に基づいて説明する。Next, the method of forming the protrusions 4 and 5 will be described with reference to FIGS.
Description will be made with reference to FIG.
まず、鋳造された固定ドラム１の外周にテープ走行面
２を切削加工する。その加工精度は、真円度が２μｍ以
下である。次に、前記固定ドラム１の内周面における磁
気テープ３の入側端部と出側端部に対応する適当範囲の
部分に凹部６を切り込み形成し、この部分の肉厚を0.1
〜0.3mm程度に薄く形成する。なお、固定ドラムを鋳造
する際に凹部６を形成してもよい。また、前記固定ドラ
ム１の上端部を全周にわたって薄肉に形成すれば、凹部
６の形成を省略することができる。First, the tape running surface 2 is cut on the outer periphery of the cast fixed drum 1. As for the processing accuracy, the roundness is 2 μm or less. Next, the concave portion 6 is cut and formed in an appropriate range of the inner peripheral surface of the fixed drum 1 corresponding to the entrance side end and the exit side end of the magnetic tape 3, and the thickness of this part is set to 0.1.
Form as thin as ~ 0.3mm. The recess 6 may be formed when casting the fixed drum. Further, if the upper end of the fixed drum 1 is formed to be thin over the entire circumference, the formation of the recess 6 can be omitted.
次に、固定ドラム１の軸心と平行な軸心回りに回転駆
動可能でかつ下端部に大径の加圧部7aを形成された成形
工具７を、固定ドラム１の内側から前記凹部６に向かっ
て矢印の如く移動させ、この成形工具７を回転させなが
ら凹部６の周面に押し当てることによって固定ドラム１
の外周に突部４、５を突出形成する。Next, a molding tool 7 that can be rotationally driven about an axis parallel to the axis of the fixed drum 1 and that has a large-diameter pressing portion 7a formed at the lower end is inserted into the recess 6 from the inside of the fixed drum 1. The fixed drum 1 is moved in the direction of the arrow and pressed against the peripheral surface of the recess 6 while rotating the molding tool 7.
Projections 4 and 5 are formed on the outer circumference of the projection.
このとき、成形工具７の回転方向は、磁気テープ３の
入側では、第２図に示すように、磁気テープ３の走行方
向と反対方向に、即ち固定ドラム１への磁気テープ３の
巻回部とは反対側に向かって回転させ、磁気テープ３の
出側では、第３図に示すように、磁気テープ３の走行方
向と同一方向に、即ちこの場合も磁気テープ３の巻回部
とは反対側に向かって回転駆動する。すると、入側及び
出側のいずれの突部４、５でも、磁気テープ３の巻回部
に近い部分がなだらかで、反対側が相対的に急峻な形状
に形成される。これは、突部４、５の塑性加工時に成形
工具７の回転に伴ってその回転方向に肉が流れることに
よる。At this time, as shown in FIG. 2, the rotating direction of the molding tool 7 is opposite to the running direction of the magnetic tape 3, that is, the magnetic tape 3 is wound around the fixed drum 1 on the entry side of the magnetic tape 3. As shown in FIG. 3, the magnetic tape 3 is rotated in the same direction as the running direction of the magnetic tape 3, that is, the winding part of the magnetic tape 3 is also rotated on the output side of the magnetic tape 3. Drives to rotate to the opposite side. Then, in each of the protrusions 4 and 5 on the input side and the output side, the portion close to the winding portion of the magnetic tape 3 is gentle, and the opposite side is formed into a relatively steep shape. This is because the meat flows in the rotation direction of the forming tool 7 during the plastic working of the protrusions 4 and 5, as the forming tool 7 rotates.
なお、形成された突部の突出量ｈは数10μｍ（例えば
好適には50〜70μｍ）で、磁気ヘッド３の突出量より大
であり、周方向の長さＷは数mm（例えば２〜3mm）で、
かつ磁気テープ巻回部から離れた端部から最大突出部ま
での距離ｗはW/2より小となっており、さらに高さ方向
の幅は任意に設定できるが、本実施例では略0.5mm程度
としてある。The protrusion amount h of the formed protrusion is several tens of μm (for example, preferably 50 to 70 μm), which is larger than the protrusion amount of the magnetic head 3, and the circumferential length W is several mm (for example, 2 to 3 mm). )so,
Further, the distance w from the end portion away from the magnetic tape winding portion to the maximum protruding portion is smaller than W / 2, and the width in the height direction can be set arbitrarily, but in this embodiment, it is approximately 0.5 mm. There is as a degree.
以上のように、成形工具７を固定ドラム１の内側から
押し付けることにより、テープ走行面２に傷を付けるこ
となく突部を形成でき、さらに成形工具７を回転させる
ことにより、テープ走行面２の真円度に影響を与えずに
突部４、５を形成できるとともに、形成した突部４、５
の表面荒さも３μｍ以下とすることができ、また固定ド
ラム１の上端面に盛り上がりを生じず、磁気ヘッドの通
過間隙に障害物が生ずる虞れもない。さらに、成形工具
７の回転方向の規制によって、突部４、５をテープ巻回
部に向かってなだらかな形状にすることができて、磁気
テープ３が突部４、５を経ても滑らかにテープ走行面２
に接触、離脱し、ジッターをさらに無くすことができる
とともに磁気ヘッドによる磁気テープのたたき音を無く
すことができる。As described above, by pressing the molding tool 7 from the inside of the fixed drum 1, a protrusion can be formed without damaging the tape running surface 2, and by rotating the molding tool 7, the tape running surface 2 The protrusions 4 and 5 can be formed without affecting the roundness, and the formed protrusions 4 and 5 can be formed.
The surface roughness can be 3 μm or less, and the upper end surface of the fixed drum 1 does not rise, and there is no possibility that an obstacle will occur in the passage gap of the magnetic head. Further, by restricting the rotation direction of the molding tool 7, the protrusions 4 and 5 can be formed into a gentle shape toward the tape winding portion, and the magnetic tape 3 can be smoothly taped even after passing through the protrusions 4 and 5. Running surface 2
It is possible to further eliminate jitter due to contact with and release from the magnetic tape, and also to eliminate the tapping sound of the magnetic tape by the magnetic head.
以上の実施例では、成形工具７を固定ドラム１の軸心
と平行な軸心回りにかつテープ入側と出側で回転方向を
異ならせて回転させながら押し付けることによって突部
４、５を形成したが、回転方向を規制しなくても、相応
の効果を発揮する突部を形成することができる。さら
に、成形工具の回転軸心を固定ドラム１の軸心に対して
平行でなくてもよく、例えば垂直方向であってもよい。In the above embodiment, the protrusions 4 and 5 are formed by pressing the molding tool 7 around the axis parallel to the axis of the fixed drum 1 and while rotating the tape in and out of the tape in different rotational directions. However, even if the rotation direction is not regulated, it is possible to form the protrusion that exhibits a corresponding effect. Furthermore, the rotation axis of the molding tool may not be parallel to the axis of the fixed drum 1, and may be vertical, for example.
さらに、以上の実施例では成形工具７を回転させなが
ら凹部６の周面に押圧することによって突部４、５を加
工する例を示したが、第６図及び第７図に示すように、
回転ドラム１の内側から凹部６の周面にパンチ状の成形
工具８を押圧して突部10を形成してもよい。その際、突
部の形成範囲が大きくなり過ぎる場合には、固定ドラム
１の外周面にダイス９を配置して形成される突部10の形
状を規制するようにしてもよい。Further, in the above embodiment, the example in which the protrusions 4 and 5 are processed by pressing the peripheral surface of the concave portion 6 while rotating the molding tool 7 has been shown, but as shown in FIG. 6 and FIG.
The punch 10 may be formed by pressing the punch-shaped forming tool 8 from the inside of the rotary drum 1 against the peripheral surface of the recess 6. At that time, if the formation range of the protrusion becomes too large, the shape of the protrusion 10 formed by disposing the die 9 on the outer peripheral surface of the fixed drum 1 may be restricted.
発明の効果 本発明の回転磁気ヘッドドラムの製造方法によれば、
以上のように突部を固定ドラムの内側から加圧成形する
ので、磁気テープの入側と出側の両方に容易に突部を形
成できるとともに、別部品等を必要としないので安価に
形成できるという効果がある。Advantageous Effects of Invention According to the method for manufacturing a rotary magnetic head drum of the present invention,
Since the protrusion is pressure-molded from the inside of the fixed drum as described above, the protrusion can be easily formed on both the input side and the output side of the magnetic tape, and it can be formed at a low cost because no separate parts are required. There is an effect.
又、本発明の第２発明によれば、成形工具をその軸心
回りに回転させながら加圧成形することによって、固定
ドラムの上端面に盛り上がりを生じることなく、またテ
ープ走行面の真円度及び突部の表面荒さあを確保しなが
ら突部を形成することができ、さらにスプリングバック
が小さいため突出量を正確に規制することができるとと
もに容易に変更することができる。According to the second aspect of the present invention, pressure molding is performed while rotating the molding tool around its axis, whereby the upper end surface of the fixed drum does not rise, and the roundness of the tape running surface is rounded. Also, the protrusion can be formed while ensuring the surface roughness of the protrusion, and since the springback is small, the amount of protrusion can be accurately regulated and easily changed.
さらに、本発明の第３発明によれば、成形工具の回転
方向を規定することによって、形成する突部の形状を、
磁気テープ巻回部に近い部分をなだらかな形状とするこ
とができ、磁気テープが滑らかにテープ走行面に接触し
て行くとともにテープ走行面から離脱して行き、さらに
ジッターのない再生が可能となるとともに磁気ヘッドに
よるたたき音を無くすことができる等、大なる効果を発
揮する。Further, according to the third aspect of the present invention, the shape of the protrusion formed by defining the rotation direction of the forming tool is
The part close to the winding part of the magnetic tape can be made into a gentle shape, and the magnetic tape smoothly comes into contact with the tape running surface and separates from the tape running surface, which enables further reproduction without jitter. At the same time, a great effect is exerted, such as eliminating the tapping sound of the magnetic head.
第１図〜第５図は本発明の一実施例を示し、第１図は突
部加工の状態を示す部分断面斜視図、第２図及び第３図
は磁気テープの入側及び出側の突部の形成状態を示す部
分拡大平面図、第４図は回転磁気ヘッドドラムに対する
磁気テープの巻回状態を示す平面図、第５図は固定ドラ
ムの側面図、第６図は別の実施例の突部加工の状態を示
す部分断面斜視図、第７図は同突部の形成状態を示す部
分拡大平面図である。 １……固定ドラム ２……テープ走行面 ３……磁気テープ ４、５……突部 ７……成形工具 ８……成形工具 10……突部。1 to 5 show an embodiment of the present invention. FIG. 1 is a partial cross-sectional perspective view showing a state of processing a protrusion, and FIGS. 2 and 3 show an input side and an output side of a magnetic tape. FIG. 4 is a partially enlarged plan view showing the formation state of the protrusions, FIG. 4 is a plan view showing the winding state of the magnetic tape around the rotary magnetic head drum, FIG. 5 is a side view of the fixed drum, and FIG. 6 is another embodiment. FIG. 7 is a partial cross-sectional perspective view showing a state of processing of the protrusion, and FIG. 1 ... Fixed drum 2 ... Tape running surface 3 ... Magnetic tape 4,5 ... Projection 7 ... Molding tool 8 ... Molding tool 10 ... Projection.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊藤 博之 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平１−30051（ＪＰ，Ａ) 特開 昭62−132257（ＪＰ，Ａ) 特開 昭58−6547（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Ito 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) 132257 (JP, A) JP 58-6547 (JP, A)
Claims (3)
磁気ヘッドドラムの固定ドラムの製造工程において、固
定ドラムの外周に磁気テープの走行面を形成した後、こ
の走行面における磁気テープ入側端部の上縁近傍と磁気
テープ出側端部の上縁近傍に、固定ドラムの内側からの
加圧成形にて突部を突出形成することを特徴とする回転
磁気ヘッドドラムの製造方法。1. In a manufacturing process of a fixed drum of a rotary magnetic head drum in a helical scan type VTR, after a running surface of a magnetic tape is formed on an outer periphery of the fixed drum, a magnetic tape entry side end portion of the running surface is formed. A method of manufacturing a rotary magnetic head drum, characterized in that a protrusion is formed by pressure molding from the inside of a fixed drum near the edge and near the upper edge of the magnetic tape ejection side end.
磁気ヘッドドラムの固定ドラムの製造工程において、固
定ドラムの外周に磁気テープの走行面を形成した後、こ
の走行面における磁気テープ入側端部の上縁近傍と磁気
テープ出側端部の上縁近傍に、軸心回りに回転する成形
工具を固定ドラムの内側から加圧して突部を突出形成す
ることを特徴とする回転磁気ヘッドドラムの製造方法。2. In a process of manufacturing a fixed drum of a rotary magnetic head drum in a helical scan type VTR, after a running surface of a magnetic tape is formed on the outer circumference of the fixed drum, the magnetic tape entry side end portion of the running surface is formed. A method for manufacturing a rotary magnetic head drum, characterized in that a protrusion is formed by pressing a molding tool rotating around an axis from the inside of the fixed drum in the vicinity of the edge and in the vicinity of the upper edge of the magnetic tape output side end portion. .
磁気ヘッドドラムの固定ドラムの製造工程において、固
定ドラムの外周に磁気テープの走行面を形成した後、こ
の走行面における磁気テープ入側端部の上縁近傍と磁気
テープ出側端部の上縁近傍に、固定ドラムの軸心と平行
な軸心回りに、磁気テープ入側端部では磁気テープの走
行方向と反対方向に、磁気テープ出側端部では磁気テー
プの走行方向と同一方向にそれぞれ回転させた成形工具
を固定ドラムの内側から加圧して突部を突出形成するこ
とを特徴とする回転磁気ヘッドドラムの製造方法。3. In a process of manufacturing a fixed drum of a rotary magnetic head drum in a helical scan type VTR, after a running surface of a magnetic tape is formed on the outer periphery of the fixed drum, the magnetic tape entry side end portion of the running surface is formed. Near the edge and near the upper edge of the magnetic tape output side end, around the axis parallel to the axis of the fixed drum, and at the magnetic tape input side end in the direction opposite to the running direction of the magnetic tape, the magnetic tape output side end. A method for manufacturing a rotary magnetic head drum, characterized in that the protrusions are formed by pressurizing a forming tool rotated in the same direction as the running direction of the magnetic tape from the inside of the fixed drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62264412A JP2517008B2 (en) | 1987-10-20 | 1987-10-20 | Method of manufacturing rotating magnetic head drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62264412A JP2517008B2 (en) | 1987-10-20 | 1987-10-20 | Method of manufacturing rotating magnetic head drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01106354A JPH01106354A (en) | 1989-04-24 |
| JP2517008B2 true JP2517008B2 (en) | 1996-07-24 |
Family
ID=17402806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62264412A Expired - Fee Related JP2517008B2 (en) | 1987-10-20 | 1987-10-20 | Method of manufacturing rotating magnetic head drum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2517008B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02310847A (en) * | 1989-05-24 | 1990-12-26 | Sharp Corp | Working method for rotary magnetic head cylinder |
| JP2510885B2 (en) * | 1989-07-25 | 1996-06-26 | シャープ株式会社 | Machining method of rotating magnetic head cylinder |
| JPH0638022U (en) * | 1992-10-06 | 1994-05-20 | 三星電子株式会社 | Magnetic recording and reproducing device |
-
1987
- 1987-10-20 JP JP62264412A patent/JP2517008B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01106354A (en) | 1989-04-24 |
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