JPS61250815A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS61250815A JPS61250815A JP60091078A JP9107885A JPS61250815A JP S61250815 A JPS61250815 A JP S61250815A JP 60091078 A JP60091078 A JP 60091078A JP 9107885 A JP9107885 A JP 9107885A JP S61250815 A JPS61250815 A JP S61250815A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic tape
- recording
- head
- tape
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 22
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
Classifications
-
- 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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
- G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
-
- 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
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
-
- 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
- G11B23/50—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges
- G11B23/502—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges of tape carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/06—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using web-form record carriers, e.g. tape
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ヘリカルスキャン方式の磁気記録再生装置
において、記録・再生用の磁気ヘッドまたは走行する磁
気テー−プが塵埃等によって異常摩耗、損傷するのを軽
減するようにした磁気記録再生装置に関するものである
。[Detailed Description of the Invention] [Industrial Application Field] This invention provides a helical scan type magnetic recording/reproducing device in which a magnetic head for recording/reproducing or a running magnetic tape is subjected to abnormal wear or damage due to dust, etc. The present invention relates to a magnetic recording/reproducing device that reduces the amount of noise.
この発明は、回転する記録・再生用の磁気ヘッドによっ
て磁気テープに信号を記録したり、または磁気テープに
記録された信号を再生する磁気記録再生装置において、
磁気テープに刺着した塵埃等を排除する部材を記録・再
生用の磁気ヘッドの１−流側に配置することにより、記
録・再生用の磁気ヘッドまたは磁気テープが塵埃等によ
って異常摩耗、損傷するのを軽減°するようにしたもの
である。The present invention provides a magnetic recording and reproducing apparatus that records signals on a magnetic tape or reproduces signals recorded on a magnetic tape using a rotating recording/reproducing magnetic head.
By placing a member that removes dust stuck to the magnetic tape on the 1-stream side of the recording/reproducing magnetic head, the recording/reproducing magnetic head or the magnetic tape may be abnormally worn or damaged by dust, etc. It is designed to reduce the
従来の磁気記録再生装置、例えばビデオテープレコーダ
（以下、単にＶＴＲという。）は、記録・再生用の磁気
ヘッドが単独で、または」−ドラム等と一体で回転する
構成とされている。2. Description of the Related Art Conventional magnetic recording and reproducing devices, such as video tape recorders (hereinafter simply referred to as VTRs), have a magnetic head for recording and reproducing that rotates independently or integrally with a drum or the like.
第６図はかかる従来の記録・再生用の磁気ヘッドが上ド
ラムと−・体で回転するＶＴＲの回転ドラムを示す正面
図、第７図は磁気ヘッドと磁気テープの接触状態を示す
説明図である。FIG. 6 is a front view showing a rotating drum of a VTR in which a conventional recording/reproducing magnetic head rotates with the upper drum, and FIG. 7 is an explanatory diagram showing the state of contact between the magnetic head and magnetic tape. be.
これらの図において、２１は回転ドラムを示し、下ドラ
ム２２と上ドラム２３で構成されている。In these figures, 21 indicates a rotating drum, which is composed of a lower drum 22 and an upper drum 23.
上ドラム２３にはヘッド基板等（図示省略）を介して記
録、再生用の磁気ヘッド２４と、消去用の磁気ヘッド（
図示省略）が取付けられている。The upper drum 23 has a magnetic head 24 for recording and reproducing, and a magnetic head for erasing (
(not shown) is attached.
Ｔは前記回転ドラム２１に巻き付きながら走行する磁気
テープを示す。T indicates a magnetic tape that runs while being wound around the rotating drum 21.
第６図のように構成された回転ドラム２１を備えたＶＴ
Ｒは、」ニドラム２３を矢印Ａ方向へ回転させるととも
に、磁気テープＴをテープ走行機構（図示省略）で矢印
Ｂ方向へ走行させることにより、磁気テープＴに磁気ヘ
ッド２４で信号を記録したり、磁気テープＴに記録され
た信号を磁気ヘッド２４で再生することができる。VT equipped with a rotating drum 21 configured as shown in FIG.
R records a signal on the magnetic tape T with the magnetic head 24 by rotating the drum 23 in the direction of arrow A and running the magnetic tape T in the direction of arrow B with a tape running mechanism (not shown); Signals recorded on the magnetic tape T can be reproduced by the magnetic head 24.
上記のように信号の記録または再生を行う場合、回転す
る磁気ヘッド２４は走行する磁気テープＴに第７図のよ
うに接触し、磁気ヘッド２４の先端の曲率は回転ドラム
２１に巻き付いている磁気テープＴの曲率よりも小さく
されているため、磁気ヘッド２４の前、後端と磁気テー
プＴの間に間隙が生ずる。When recording or reproducing signals as described above, the rotating magnetic head 24 comes into contact with the running magnetic tape T as shown in FIG. Since the curvature is smaller than the curvature of the tape T, gaps are created between the front and rear ends of the magnetic head 24 and the magnetic tape T.
したがって、回転ドラム２１と磁気テープＴの間に塵埃
等が入ったり、磁気テープＴに塵埃等が刺着していると
、磁気ヘッド２４の記録、再生面との間に塵埃等が蓄積
し、スペーシングロスが増加して信号の記録、再生の特
性が劣化したり、ドロップアウト現象が発生する。Therefore, if dust or the like gets between the rotating drum 21 and the magnetic tape T, or if dust or the like sticks to the magnetic tape T, the dust or the like will accumulate between the recording and reproducing surfaces of the magnetic head 24. Spacing loss increases, resulting in deterioration of signal recording and reproduction characteristics and dropout phenomenon.
また、磁気ヘッド２４または磁気テープＴが異常摩耗、
損傷する等の問題点がある。In addition, the magnetic head 24 or the magnetic tape T may be abnormally worn.
There are problems such as damage.
この発明は、上記したような問題点を解決するためにな
されたもので、塵埃等によって磁気ヘッドまたは磁気テ
ープが異常摩耗、損傷するのを軽減する磁気記録再生装
置を提供するものである。The present invention has been made to solve the above-mentioned problems, and provides a magnetic recording/reproducing apparatus that reduces abnormal wear and damage to a magnetic head or magnetic tape caused by dust or the like.
この発明の磁気記録再生装置は、磁気テープに接触し、
磁気ヘッドの上流側で磁気ヘッドの回転方向に対して斜
交する面を備えた部材を配置したものである。The magnetic recording/reproducing device of the present invention is in contact with a magnetic tape;
A member having a surface oblique to the direction of rotation of the magnetic head is arranged upstream of the magnetic head.
この発明においては、部材によって記録φ再生用の磁気
ヘッドがトレースする磁気テープの部分に付着した塵埃
等を排除することにより、記録・再生用の磁気ヘッドと
磁気テープの間に塵埃等が介在しなくなる。In this invention, by using a member to remove dust adhering to the part of the magnetic tape traced by the recording/reproducing magnetic head, dust and the like are not present between the recording/reproducing magnetic head and the magnetic tape. It disappears.
第１図はこの発明の一実施例であるＶＴＲの回転ドラム
を示す正面図、第２図（ａ）、（ｂ）はガイドの取付は
例を示す上ドラムの拡大底面図とヘッド基板の拡大部分
正面図、第３図（ａ）、（ｂ）は記録・再生用の磁気ヘ
ッドと磁気テープの接触状態と、磁気ヘッドとガイドの
位置関係を示す説明図である。FIG. 1 is a front view showing a rotating drum of a VTR which is an embodiment of the present invention, and FIGS. 2(a) and (b) are an enlarged bottom view of the upper drum and an enlarged view of the head board showing an example of guide installation. The partial front view and FIGS. 3(a) and 3(b) are explanatory views showing the state of contact between the recording/reproducing magnetic head and the magnetic tape, and the positional relationship between the magnetic head and the guide.
これらの図において、ｌは回転ドラムを示し、下ドラム
２と、回転する上ドラム３で構成されている。In these figures, l indicates a rotating drum, which is composed of a lower drum 2 and a rotating upper drum 3.
上ドラム３には記録・再生用の磁気ヘッド４Ａ。The upper drum 3 has a magnetic head 4A for recording and reproducing.
４Ｂがヘッド基板５Ａ 、５Ｂを介して螺子８Ａ。4B is the head board 5A, and the screw 8A is connected through 5B.
６Ｂによって取付けられている。It is attached by 6B.
そして、ヘッド基板５Ａ、５Ｂには塵埃等を排除する耐
摩耗性の材料、例えばパーマロイ等で磁気ヘッド４Ａ
、４Ｂと同様の形状に構成したガイド７Ａ、７Ｂが取付
けられている。The head substrates 5A and 5B are made of a wear-resistant material, such as permalloy, that eliminates dust, etc., for the magnetic head 4A.
, 4B are attached to guides 7A and 7B having the same shape.
なお、ガイド７Ａ、７Ｂは磁気ヘッド４Ａ、４Ｂの上流
側で、磁気ベッド４Ａ 、４Ｂの回転方向に対して所定
角度、例えば１５度〜２０度位傾斜させである。そして
、ガイド７Ａ、７Ｂが磁気テープＴに接触する幅は、磁
気ヘッド４Ａ 、４Ｂが磁気テープＴに接触する幅より
も広くしである。The guides 7A, 7B are upstream of the magnetic heads 4A, 4B and are inclined at a predetermined angle, for example, about 15 to 20 degrees, with respect to the rotation direction of the magnetic beds 4A, 4B. The width at which the guides 7A, 7B contact the magnetic tape T is wider than the width at which the magnetic heads 4A, 4B contact the magnetic tape T.
この発明のＶＴＲは、回転ドラム１が第１図。In the VTR of this invention, a rotating drum 1 is shown in FIG.
第２図のように構成されているので、上ドラム３を矢印
Ａ方向へ回転させるとともに、磁気テープＴをテープ走
行機構（図示省略）で矢印Ｂ方向へ走行させることによ
り、従来と同様に磁気テープＴに磁気ヘッド、４Ａ、４
Ｂで信号を記録したり、磁気ヘッド４Ａ 、４Ｂで磁気
テープＴに記録された信号を再生することができる。Since it is configured as shown in Fig. 2, by rotating the upper drum 3 in the direction of arrow A and running the magnetic tape T in the direction of arrow B using a tape running mechanism (not shown), the magnetic tape can be Magnetic head on tape T, 4A, 4
Signals can be recorded on the magnetic tape T, and signals recorded on the magnetic tape T can be reproduced using the magnetic heads 4A and 4B.
このように記録、再生するとき、第２図（ｂ）のように
ヘッド基板５Ａ、５Ｂに形成したテーパ面５ａ（５ｂ）
にガイド７Ａ（７Ｂ）が取付けられているので、」−ド
ラム３が矢印Ａ方向へ回転すると、磁気ヘラｌ−：’４
Ａ（４Ｂ）よりも先にガイド７Ａ （７Ｂ）が磁気テー
プＴに接触し、そのエツジ７ａ（７ｂ）で磁気テープＴ
に刺着した塵埃等を１−ドラム３の回転方向に対して左
側（第３図）へ刊除できる。When recording and reproducing in this way, the tapered surfaces 5a (5b) formed on the head substrates 5A and 5B as shown in FIG. 2(b)
Since the guide 7A (7B) is attached to , when the drum 3 rotates in the direction of arrow A, the magnetic spatula l-:'4
The guide 7A (7B) comes into contact with the magnetic tape T before A (4B), and the edge 7a (7b) touches the magnetic tape T.
Dust and the like stuck to the drum 1 can be removed to the left (Fig. 3) with respect to the rotational direction of the drum 3.
したがって、磁気ヘッド４Ａ 、４Ｂと、磁気テープＴ
の間に塵埃等が入らなくなり、記録、再生の特性が良好
になり、磁気ヘッド４Ａ 、４Ｂと磁気テープＴが塵埃
等によって異常摩耗、損傷することも軽減できる。Therefore, the magnetic heads 4A, 4B and the magnetic tape T
This prevents dust from entering between them, improving recording and reproducing characteristics, and reducing abnormal wear and damage to the magnetic heads 4A, 4B and the magnetic tape T due to dust.
なお、第１図、第２図に示した実施例は、磁気テープＴ
に付着した塵埃等をガイド７Ａ 、７Ｂのエツジ７ａ、
７ｂで上ドラム３の回転方向に対して左側へ排除させた
か、第４図のようにガイド７Ａ （７Ｂ）をヘッド基板
５Ａ （５Ｂ）に取イ１け、塵埃等を上ドラム３の回転
方向に対して右側へ刊除させてもよい。Note that the embodiment shown in FIGS. 1 and 2 is based on the magnetic tape T.
Remove dust etc. from the edges 7a of guides 7A and 7B,
7b to the left with respect to the rotational direction of the upper drum 3, or take the guide 7A (7B) to the head board 5A (5B) as shown in Figure 4 to remove dust, etc. in the rotational direction of the upper drum 3. It is also possible to remove the publication to the right.
＄５図（ａ）、（ｂ）はこの発明の他の実施例であるＶ
ＴＲの上ドラムを示す拡大正面図と、拡大底面図である
。$5 Figures (a) and (b) show V which is another embodiment of this invention.
They are an enlarged front view and an enlarged bottom view showing the upper drum of the TR.
これらの図において、１１は回転ドラムの回転する上ド
ラムを示し、記録・再生用の磁気ヘッド１２Ａ、１２Ｂ
と消去用の磁気ヘッド１３がヘッド基板１４Ａ、１４Ｂ
、および１４Ｇを介して螺子１５Ａ、１５Ｂ、および１
５Ｇによって取伺けられている。In these figures, reference numeral 11 indicates a rotating upper drum of a rotating drum, and magnetic heads 12A and 12B for recording and reproducing.
and magnetic heads 13 for erasing are mounted on head substrates 14A and 14B.
, and 14G through screws 15A, 15B, and 1
This is being addressed by 5G.
１６は前記上ドラム１１の回転むらを除去するために取
付けたパランサを示す。Reference numeral 16 indicates a parancer attached to eliminate uneven rotation of the upper drum 11.
なお、消去用の磁気ヘッド１３は先の実施例と同様に、
ヘッド基板１４Ｃに磁気ヘッド１２Ａ。Note that the erasing magnetic head 13 is similar to the previous embodiment.
A magnetic head 12A is mounted on a head substrate 14C.
１２Ｂの回転方向に対して所定角度、例えば１５度〜２
０度位傾斜させてあり、記録・再生用の磁気ヘッド１２
Ａ、１２Ｂが磁気テープＴに接触する部分の消去ととも
に、塵埃等の排除を行う。12B at a predetermined angle, for example, 15 degrees to 2
A magnetic head 12 for recording and reproducing is tilted at about 0 degrees.
In addition to erasing the portions where A and 12B contact the magnetic tape T, dust and the like are removed.
この実施例の場合は先の実施例のガイド７Ａ。In this embodiment, it is the guide 7A of the previous embodiment.
７Ｂに代えて消去用の磁気ヘッド１３が上ドラム１１に
配置してあり、先の実施例と同様に記録。7B, an erasing magnetic head 13 is placed on the upper drum 11, and records in the same manner as in the previous embodiment.
再生が行え、同様の効果が得られる。You can regenerate it and get the same effect.
そして、消去用の磁気ヘッド１３で塵埃の排除を行って
いるので、先の実施例のように新たなガイド７Ａ 、７
Ｂを必要としないため、磁気記録再生装置の低廉化が計
れる。Since dust is removed by the erasing magnetic head 13, new guides 7A, 7 are removed as in the previous embodiment.
Since B is not required, the cost of the magnetic recording/reproducing device can be reduced.
以上説明したように、この発明の磁気記録再生装置は磁
気テープに接触し、記録・再生用の磁気ヘッドの」１流
側で記録・再生用の磁気ヘッドの回転方向に対して斜交
する面を備えた部材を配置し、この部材によって記録・
再生用の磁気ヘッドがトレースする磁気テープの部分に
付着した塵埃等を排除する構成としたので、記録・再生
用の磁気ヘッドと磁気テープの間に塵埃等が介在しなく
なる。As explained above, the magnetic recording/reproducing device of the present invention contacts a magnetic tape, and is provided with a surface obliquely perpendicular to the rotational direction of the recording/reproducing magnetic head on the first flow side of the recording/reproducing magnetic head. Arrange a member with
Since the configuration is such that dust adhering to the portion of the magnetic tape traced by the reproducing magnetic head is removed, there is no intervening dust or the like between the recording/reproducing magnetic head and the magnetic tape.
したがって、記録・再生用の磁気へ・ンドと磁気テープ
の間に塵埃等が入らなくなり、記録、再生が良好に行え
、磁気ヘッドと磁気テープＴが塵埃等によって異常摩耗
、損傷するのが軽減されるという利点がある。Therefore, dust and the like are prevented from entering between the magnetic head and the magnetic tape for recording and playback, allowing good recording and playback, and reducing abnormal wear and damage to the magnetic head and magnetic tape T due to dust and the like. It has the advantage of being
第１図はこの発明の一実施例である磁気記録再生装置の
回転ドラムを示す正面図、第２図（ａ）。
（ｂ）はガイドの取付は例を示す上ドラムの拡大底面図
とヘッド基板の拡大部分正面図、第３図（ｔ）、（ｂ）
は記録・再生用の磁気ヘッドと磁気テープの接触状態と
、磁気ヘッドとガイドの位置関係を示す説明図、第４図
はガイドの他の取付は例を示すヘッド基板の拡大部分正
面図、第５図（ａ）、（ｂ）はこの発明の他の実施例で
ある磁気記録再生装置の上ドラムを示す拡大正面図と拡
大底面図、第６図は従来の記録・再生用の磁気ヘッドが
上ドラムと一体で回転する磁気記録再生装置の回転ドラ
ムを示す正面図、第７図は磁気ヘッドと磁気テープの接
触状態を示す説明図である。
図中、ｌは回転ドラム、３は」ニドラム、４Ａ。
４Ｂは磁気ヘッド、５Ａ 、５Ｂはヘッド基板、７Ａ、
７Ｂはガイド、７ａ、７ｂはエツジ、Ｔは磁気テープを
示す。
区
Ｃつ
沫FIG. 1 is a front view showing a rotating drum of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. (b) is an enlarged bottom view of the upper drum and an enlarged partial front view of the head board showing an example of guide installation; Fig. 3 (t), (b)
4 is an explanatory diagram showing the contact state between the recording/reproducing magnetic head and the magnetic tape, and the positional relationship between the magnetic head and the guide. FIG. 5(a) and 5(b) are an enlarged front view and an enlarged bottom view showing the upper drum of a magnetic recording/reproducing device according to another embodiment of the present invention, and FIG. FIG. 7 is a front view showing the rotating drum of the magnetic recording/reproducing apparatus which rotates together with the upper drum, and is an explanatory view showing the state of contact between the magnetic head and the magnetic tape. In the figure, l is a rotating drum, 3 is a double drum, and 4A. 4B is a magnetic head, 5A, 5B is a head substrate, 7A,
7B is a guide, 7a and 7b are edges, and T is a magnetic tape. Ward C Tsumi
Claims (1)
に信号を記録し、または前記磁気テープに記録された信
号を再生する磁気記録再生装置において、前記磁気テー
プに接触し、前記磁気ヘッドの上流側で前記磁気ヘッド
の回転方向に対して斜交する面を備えた部材が配置され
ていることを特徴とする磁気記録再生装置。In a magnetic recording and reproducing apparatus that records signals on a magnetic tape or reproduces signals recorded on the magnetic tape using a rotating magnetic head for recording and reproducing, a magnetic recording device that contacts the magnetic tape and is located upstream of the magnetic head. A magnetic recording/reproducing device characterized in that a member having a surface oblique to the rotational direction of the magnetic head is disposed.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60091078A JPS61250815A (en) | 1985-04-30 | 1985-04-30 | Magnetic recording and reproducing device |
| US06/854,810 US4849839A (en) | 1985-04-30 | 1986-04-23 | Magnetic tape recording and/or reproducing apparatus rotary head assembly having sweeping device |
| EP86303260A EP0200536B1 (en) | 1985-04-30 | 1986-04-29 | Magnetic tape recording and/or reproducing apparatus with rotary head assembly |
| KR1019860003311A KR940009726B1 (en) | 1985-04-30 | 1986-04-29 | Magnetic tape recording and or reproducing apparatus with rotary head assembly |
| DE86303260T DE3689550T2 (en) | 1985-04-30 | 1986-04-29 | Magnetic tape recorder or player with turret arrangement. |
| CN86103484A CN1010993B (en) | 1985-04-30 | 1986-04-30 | Magnetic tape recording and/or reproducing apparatus with rotary head assembly |
| KR96007065U KR0122640Y1 (en) | 1985-04-30 | 1996-04-03 | Rotary head assembly of magnetic recording and reproducing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60091078A JPS61250815A (en) | 1985-04-30 | 1985-04-30 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61250815A true JPS61250815A (en) | 1986-11-07 |
Family
ID=14016472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60091078A Pending JPS61250815A (en) | 1985-04-30 | 1985-04-30 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61250815A (en) |
-
1985
- 1985-04-30 JP JP60091078A patent/JPS61250815A/en active Pending
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