JP2670799B2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JP2670799B2 JP2670799B2 JP63065700A JP6570088A JP2670799B2 JP 2670799 B2 JP2670799 B2 JP 2670799B2 JP 63065700 A JP63065700 A JP 63065700A JP 6570088 A JP6570088 A JP 6570088A JP 2670799 B2 JP2670799 B2 JP 2670799B2
- Authority
- JP
- Japan
- Prior art keywords
- dummy
- head
- head core
- reproducing head
- control signal
- 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 - Lifetime
Links
- 229910000889 permalloy Inorganic materials 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/10—Structure or manufacture of housings or shields for heads
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、VTR用の磁気ヘッドに係り、とくにテープ
摺動面をヘッドコアとダミー摺動部とで構成したVTR用
音声・制御信号記録再生ヘッドに関する。The present invention relates to a VTR magnetic head, and more particularly to a VTR audio / control signal recording / reproducing device in which a tape sliding surface is composed of a head core and a dummy sliding portion. Regarding the head.
（従来の技術） 第３図はVTR用音声・制御信号記録再生ヘッドの１例
であり、ケース１の前面に位置するテープ摺動面２は音
声記録再生用ヘッドコア３と制御信号記録再生用ヘッド
コア４と両ヘッドコア間に配置されたダミー摺動部５と
で構成されている。(Prior Art) FIG. 3 shows an example of a voice / control signal recording / reproducing head for a VTR. The tape sliding surface 2 located on the front surface of the case 1 has a voice recording / reproducing head core 3 and a control signal recording / reproducing head core. 4 and a dummy sliding portion 5 arranged between both head cores.
また、第４図は音響用テープレコーダの録音再生ヘッ
ドの１例であり、ケース６の前面に位置するテープ摺動
面７は２チャンネルのヘッドコア８とダミー摺動部９と
で構成されている。FIG. 4 shows an example of a recording / reproducing head of an audio tape recorder. The tape sliding surface 7 located on the front surface of the case 6 is composed of a 2-channel head core 8 and a dummy sliding portion 9. .
ところで、従来の第３図及び第４図に示すごとき磁気
ヘッドは、偏摩耗を防ぐためにヘッドコアとダミー摺動
部とを同程度の耐摩耗性の材料で構成していた。例え
ば、ヘッドコアをパーマロイ、センダスト、フェライト
等の磁性材料で構成した場合、ダミー摺動部はヘッドコ
アと同程度の耐摩耗性の非磁性材料を選択していた。By the way, in the conventional magnetic head as shown in FIGS. 3 and 4, the head core and the dummy sliding portion are made of materials having approximately the same wear resistance in order to prevent uneven wear. For example, when the head core is made of a magnetic material such as permalloy, sendust, or ferrite, the dummy sliding portion has been selected from a non-magnetic material having the same level of wear resistance as the head core.
第３図の磁気ヘッドにおいて、ヘッドコア3,4を一般
的なパーマイロとし、ダミー摺動部５をそれと同程度の
耐摩耗性の材料で構成した場合のテープ摺動面の摩耗の
様子を第５図の断面図に示す。この第５図から明らかな
ように、テープ摺動面２が全体に亙り大きく摩耗し、し
かも微視的に見ると偏摩耗も生じている。すなわち、ヘ
ッドコア3,4はテープ摺動面以外のケース前面よりも寸
法x1だけ摩耗しかつ偏摩耗σ１が生じ、ダミー摺動部５
は寸法x2だけ摩耗しかつ偏摩耗σ２が生じている。そし
て、実質的に１ ＋σ１＋２＋σ２、σ１≠σ２ の関係が成り立つ。In the magnetic head of FIG. 3, when the head cores 3 and 4 are made of a general permylo and the dummy sliding portion 5 is made of a material having the same level of abrasion resistance, the wear state of the tape sliding surface is shown in FIG. Shown in the cross-sectional view of the figure. As is apparent from FIG. 5, the tape sliding surface 2 is greatly worn over the whole, and uneven wear occurs when viewed microscopically. That is, the head core 3 and 4 worn by the dimension x 1 than the front of the case other than the tape sliding surface and cause uneven wear sigma 1, dummy sliding portion 5
Has a size of x 2 and uneven wear σ 2 . Then, substantially 1 + σ 1 + 2 + σ 2, σ 1 ≠ σ 2 relation holds.
（発明が解決しようとする課題） ところで、従来の磁気ヘッドの場合、ヘッドコアを安
価であるが耐摩耗性に劣るパーマロイで構成し、ダミー
摺動部をヘッドコアと同程度の耐摩耗性の材料で構成す
ると、磁気ヘッドの使用に伴いテープ摺動面が全体に亙
り一気に摩耗してしまい、寿命が短い欠点がある。しか
も、第５図のようにテープ摺動面２が平均的に減るよう
にみえても微視的にはかなり大きな偏摩耗σ1,σ２が発
生し、ヘッドコア部分の偏摩耗σ１では出力低下、高域
特性劣化を生じ、ダミー摺動部部分の偏摩耗σ２によっ
て磁気テープ走行時に振動を発生し、ワウフラッタを引
き起こす問題があった。(Problems to be solved by the invention) By the way, in the case of the conventional magnetic head, the head core is made of permalloy, which is inexpensive but inferior in wear resistance, and the dummy sliding portion is made of a material having the same wear resistance as the head core. With this configuration, the sliding surface of the tape wears all at once with the use of the magnetic head, resulting in a short life. Moreover, even if the tape sliding surface 2 seems to be reduced on average as shown in FIG. 5, microscopically large uneven wear σ 1 , σ 2 occurs, and the uneven wear σ 1 of the head core produces an output. reduction results in a high-frequency characteristics deteriorate, the vibration occurs during the magnetic tape running by uneven wear sigma 2 dummy sliding portion, has a problem of causing wow and flutter.
本発明は、上記の点に鑑み、長寿命化及び磁気テープ
走行の安定化を図り得るVTR用音声・制御信号記録再生
ヘッドを提供することを目的とする。SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a VTR audio / control signal recording / reproducing head capable of achieving a long life and stabilizing the running of a magnetic tape.
（課題を解決するための手段） 上記目的を達成するために、本発明は、音声記録再生
用ヘッドコアと制御信号記録再生用ヘッドコアと両ヘッ
ドコア間に配置されたダミー摺動部とでテープ摺動面が
構成されたVTR用音声・制御信号記録再生ヘッドにおい
て、 前記音声用記録再生用ヘッドコアと制御信号記録再生
用ヘッドコアとをパーマロイで構成するとともに、前記
ダミー摺動部をパーマロイよりも耐摩耗性の優れた材料
で構成したことを特徴とするものである。(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a tape sliding with a voice recording / reproducing head core, a control signal recording / reproducing head core, and a dummy sliding portion arranged between the head cores. In a VTR voice / control signal recording / reproducing head having a surface, the voice recording / reproducing head core and the control signal recording / reproducing head core are made of permalloy, and the dummy sliding portion is more wear resistant than permalloy. It is characterized by being composed of an excellent material.
（作用） 本発明のVTR用音声・制御信号記録再生ヘッドにおい
ては、ダミー摺動部の方が耐摩耗性が良好であり、ヘッ
ドコアが先に摩耗して行くが、磁気テープは耐摩耗ダミ
ー摺動部で支えられるので長寿命となる。また、ダミー
摺動部には大きな偏摩耗は発生せず、磁気テープ走行が
安定となり、従来問題となっていたワウフラッタが無く
なった。すなわち、従来1.2dBのワウフラッタが実質的
に0dBとなった。(Operation) In the VTR audio / control signal recording / reproducing head of the present invention, the dummy sliding portion has better wear resistance, and the head core wears first, but the magnetic tape does not. Since it is supported by the moving part, it has a long life. Also, there was no significant uneven wear on the dummy sliding portion, the running of the magnetic tape became stable, and the wow and flutter which had been a problem in the past was eliminated. In other words, 1.2 dB of wow and flutter is virtually 0 dB.
（実施例） 以下、本発明に係るVTR用音声・制御信号記録再生ヘ
ッドの実施例を図面に従って説明する。(Embodiment) An embodiment of a VTR audio / control signal recording / reproducing head according to the present invention will be described below with reference to the drawings.
第１図及び第２図は第３図のVTR用音声・制御信号記
録再生ヘッドの前面部分の縦断面図であり、第１図は使
用前（摩耗前）、第２図は使用後の摩耗した状態を示
す。これらの図において、ケースの前面に位置するテー
プ摺動面２は音声記録再生用ヘッドコア３と制御信号記
録再生用ヘッドコア４と両ヘッドコア間に配置されたダ
ミー摺動部5Aとで構成されている。ここで、ヘッドコア
3,4は磁性材料であるパーマロイで構成され、ダミー摺
動部5Aはヘッドコア3,4よりも磁気テープに対して耐摩
耗性の優れた非磁性材料又は磁性材料（この場合はヘッ
ドギャップに対して僅かに間隙をあけて配置する）で構
成される。たとえば、ヘッドコア3,4がパーマロイ（Fe:
20％、Ni:80％）の場合、ダミー摺動部5Aはこれよりも
磁気テープに対して耐摩耗性の優れたFe−Ni合金（Niが
40％以下のもの）とする。また、ヘッドコア3,4をパー
マロイ（Fe:20％、Ni:80％）、ダミー摺動部5Aをこれよ
りも磁気テープに対して耐摩耗性の優れたFe−Co合金
（Coが40％以下のもの）としても良い。1 and 2 are vertical cross-sectional views of the front portion of the VTR audio / control signal recording / reproducing head shown in FIG. 3. FIG. 1 is before use (before wear), and FIG. 2 is after wear. Shows the state. In these figures, the tape sliding surface 2 located on the front surface of the case is composed of an audio recording / reproducing head core 3, a control signal recording / reproducing head core 4, and a dummy sliding portion 5A arranged between the head cores. . Where the head core
3 and 4 are made of permalloy, which is a magnetic material, and the dummy sliding part 5A has a non-magnetic material or magnetic material that has better wear resistance to the magnetic tape than the head cores 3 and 4 (in this case, to the head gap). And place them with a slight gap between them). For example, head cores 3 and 4 are made of permalloy (Fe:
In the case of 20%, Ni: 80%), the dummy sliding portion 5A is a Fe-Ni alloy (Ni
40% or less). In addition, the head cores 3 and 4 are made of permalloy (Fe: 20%, Ni: 80%), and the dummy sliding portion 5A is made of a Fe-Co alloy (Co content of 40% or less), which has better wear resistance than the magnetic tape. Stuff).
なお、テープ摺動面２を外れた前面部分も通常ダミー
摺動部5Aと同じ材料とする。In addition, the front surface portion that is off the tape sliding surface 2 is usually made of the same material as the dummy sliding portion 5A.
上記実施例の場合、第２図の摩耗状態の断面図から明
らかなように、ダミー摺動部5Aの摩耗量が少なく、しか
も微視的にみてもダミー摺動部5Aの偏摩耗σ１が殆ど無
い。このことは、ダミー摺動部5Aの偏摩耗に起因する磁
気テープ走行時の振動を防止し、ひいてはワウフラッタ
の発生を防止可能であることを意味する。In the case of the above-mentioned embodiment, as is clear from the sectional view of the worn state of FIG. 2, the amount of wear of the dummy sliding portion 5A is small, and the uneven wear σ 1 of the dummy sliding portion 5A is microscopically observed. Almost none. This means that it is possible to prevent vibration during running of the magnetic tape due to uneven wear of the dummy sliding portion 5A, and thus to prevent wow and flutter.
以下の表１は本発明の効果を示すもので、使用時間と
ヘッドコアの摩耗量との関係を示す。Table 1 below shows the effects of the present invention and shows the relationship between the usage time and the amount of wear of the head core.
（但し、従来品は、ヘッドコアがパーマロイ、ダミー摺
動部がこれと同等の耐摩耗性の材料、実施例品はヘッド
コアがパーマロイ、ダミー摺動部が（Fe70Ni30）95Cr5
（数字は重量％を示す） 上記の表１から、従来品は1000時間程度で完全に寿命
が来ていたものが、本発明の実施例品のものは1000時間
経過後も充分使用できることが判る。 (However, in the conventional product, the head core was made of permalloy and the dummy sliding part was made of a material of equivalent wear resistance. In the example product, the head core was made of permalloy and the dummy sliding part was made of (Fe 70 Ni 30 ) 95 Cr 5
(Numbers indicate% by weight) From Table 1 above, it can be seen that the conventional product had a complete life of about 1000 hours, but the product of the example of the present invention can be sufficiently used even after 1000 hours have passed. .
（発明の効果） 以上説明したように、本発明のVTR用音声・制御信号
記録再生ヘッドによれば、音声記録再生用ヘッドコアと
制御信号記録再生用ヘッドコアとをパーマロイで構成す
るとともに、ダミー摺動部をパーマロイよりも耐摩耗性
の優れた材料で構成したので、以下の効果を得ることが
できる。(Effects of the Invention) As described above, according to the VTR audio / control signal recording / reproducing head of the present invention, the audio recording / reproducing head core and the control signal recording / reproducing head core are made of permalloy, and dummy sliding is performed. Since the part is made of a material having better wear resistance than permalloy, the following effects can be obtained.
（１） ヘッドコア部分が先に摩耗して行くが、耐摩耗
性の優れたダミー摺動部で磁気テープが支えられるた
め、ヘッドコアとしてパーマロイを用いた低コスト磁気
ヘッドであっても平均寿命は数倍になった。(1) The head core part wears first, but since the magnetic tape is supported by the dummy sliding part, which has excellent wear resistance, even with a low-cost magnetic head using permalloy as the head core, the average life is several Doubled.
（２） ダミー摺動部の偏摩耗が無く、磁気テープ走行
時の振動を無くし、電磁変換特性を良好に維持でき、ワ
ウフラッタを実質的に0dBに抑えることができる。(2) There is no uneven wear of the dummy sliding portion, vibration during running of the magnetic tape can be eliminated, electromagnetic conversion characteristics can be maintained well, and wow and flutter can be substantially suppressed to 0 dB.
第１図は本発明に係るVTR用音声・制御信号記録再生ヘ
ッドの実施例であって使用前の縦断面図、第２図は同じ
く使用後の縦断面図、第３図はVTR用音声・制御信号記
録再生ヘッドの１例を示す正面図、第４図は音響用テー
プレコーダの録音再生ヘッドの１例を示す正面図、第５
図は第３図のヘッドの摩耗時のＶ−Ｖ断面図である。 １……ケース、２……テープ摺動面、3,4……ヘッドコ
ア、5,5A……ダミー摺動部。FIG. 1 is an embodiment of a VTR audio / control signal recording / reproducing head according to the present invention, and is a longitudinal sectional view before use, FIG. 2 is a longitudinal sectional view after the same, and FIG. FIG. 4 is a front view showing an example of a control signal recording / reproducing head, FIG. 4 is a front view showing an example of a recording / reproducing head of an audio tape recorder, and FIG.
The drawing is a sectional view taken along line VV of the head of FIG. 3 when it is worn. 1 ... case, 2 ... tape sliding surface, 3, 4 ... head core, 5, 5A ... dummy sliding part.
Claims (1)
再生用ヘッドコアと両ヘッドコア間に配置されたダミー
摺動部とでテープ摺動面が構成されたVTR用音声・制御
信号記録再生ヘッドにおいて、 前記音声記録再生用ヘッドコアと制御信号記録再生用ヘ
ッドコアとをパーマロイで構成するとともに、前記ダミ
ー摺動部をパーマロイよりも耐摩耗性の優れた材料で構
成したことを特徴とするVTR用音声・制御信号記録再生
ヘッド。1. A VTR audio / control signal recording / reproducing head having a tape sliding surface composed of an audio recording / reproducing head core, a control signal recording / reproducing head core, and a dummy sliding portion arranged between both head cores. The voice recording / reproducing head core and the control signal recording / reproducing head core are made of permalloy, and the dummy sliding portion is made of a material having better wear resistance than permalloy. Signal recording / playback head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065700A JP2670799B2 (en) | 1988-03-22 | 1988-03-22 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065700A JP2670799B2 (en) | 1988-03-22 | 1988-03-22 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01241008A JPH01241008A (en) | 1989-09-26 |
| JP2670799B2 true JP2670799B2 (en) | 1997-10-29 |
Family
ID=13294547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63065700A Expired - Lifetime JP2670799B2 (en) | 1988-03-22 | 1988-03-22 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2670799B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880125A (en) * | 1981-11-07 | 1983-05-14 | Tdk Corp | Magnetic head |
-
1988
- 1988-03-22 JP JP63065700A patent/JP2670799B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01241008A (en) | 1989-09-26 |
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