JPS6141045B2 - - Google Patents
Info
- Publication number
- JPS6141045B2 JPS6141045B2 JP9736979A JP9736979A JPS6141045B2 JP S6141045 B2 JPS6141045 B2 JP S6141045B2 JP 9736979 A JP9736979 A JP 9736979A JP 9736979 A JP9736979 A JP 9736979A JP S6141045 B2 JPS6141045 B2 JP S6141045B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- head
- contact
- rotating head
- cleaning mechanism
- 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
Links
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
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
- G11B5/41—Cleaning of heads
-
- 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
Description
【発明の詳細な説明】
この発明は回転ヘツド形磁気テープ装置におけ
る磁気テープ損傷防止方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing damage to a magnetic tape in a rotating head type magnetic tape device.
回転ヘツドと磁気テープの間に微少なすきまを
形成し、非接触で記録再生することを特徴とする
回転ヘツド形磁気テープ装置が最近使用されてい
る。このような装置では回転ヘツドと磁気テープ
は通常非接触に保たれているが、磁気テープから
の脱落ゴミ、じんあいゴミなどが回転ヘツドに付
着し、磁気テープと回転ヘツドが接触する現象が
ある。この接触現象は、使用時間と必ずしも対応
せず、あらかじめ予測することができないので、
接触現象に伴う磁気テープ損傷を防止するために
は、接触初期に接触現象を検出することが重要で
ある。しかしながら、従来はこのような装置使用
中の接触検出手段がなかつた。このため磁気テー
プ損傷防止方式としては、装置使用後に、例えば
磁気テープ巻戻し後回転ヘツドを清掃する方式が
採用されており、磁気テープ損傷防止効果が十分
得られなかつた。 Recently, rotating head type magnetic tape devices have been used which are characterized by forming a small gap between the rotating head and the magnetic tape and recording and reproducing without contact. In such devices, the rotating head and the magnetic tape are normally maintained in a non-contact manner, but there is a phenomenon in which dust or dirt that has fallen from the magnetic tape adheres to the rotating head, causing the magnetic tape and the rotating head to come into contact. . This contact phenomenon does not necessarily correspond to the usage time and cannot be predicted in advance, so
In order to prevent damage to the magnetic tape due to contact phenomena, it is important to detect contact phenomena at the initial stage of contact. However, conventionally, there was no means for detecting contact during use of such a device. For this reason, as a method for preventing damage to the magnetic tape, a method has been adopted in which the rotary head is cleaned after the device is used, for example, after rewinding the magnetic tape, but the effect of preventing damage to the magnetic tape has not been sufficiently achieved.
この発明の目的とするところは、前記の如き従
来の問題点を除去するものであり、回転ヘツドと
記録媒体である磁気テープとの接触時に受ける損
傷を最少限度におさえるという効果を有する磁気
テープ損傷防止方式を提供することにある。 The purpose of the present invention is to eliminate the above-mentioned conventional problems, and to reduce damage to a magnetic tape which has the effect of minimizing damage caused when a rotating head contacts a magnetic tape which is a recording medium. The purpose is to provide a prevention method.
本発明の特徴とするところは、回転ヘツド用ロ
ータモータの駆動電流の増大を検出し、回転ヘツ
ド清掃機構を駆動するところにある。 A feature of the present invention is that an increase in the drive current of the rotary head rotor motor is detected to drive the rotary head cleaning mechanism.
次に本発明の一実施例を図面を用いて詳細に説
明する。第１図を参照するに、ロータモータの速
度制御回路及び駆動回路１はロータモータ３の端
子の一方に接続され、ロータモータ３のもう一方
の端子はモータ電流検出回路４に接続される。モ
ータ電流検出回路４の出力は、差電流検出回路５
に接続される。ロータモータ３には、その駆動軸
に回転ヘツド９を搭載しているロータ２が機械的
に接続されている。また、差電流検出回路５の出
力はヘツド清掃機構駆動回路６の入力に接続され
ている。更にヘツド清掃機構駆動回路６の出力は
ヘツド清掃機構７に接続されている。このヘツド
清掃機構７はヘツド清掃機構駆動回路６の信号に
より、ロータ２に搭載されている回転ヘツド９と
接触したり、離れたりする。 Next, one embodiment of the present invention will be described in detail using the drawings. Referring to FIG. 1, a rotor motor speed control circuit and drive circuit 1 is connected to one terminal of a rotor motor 3, and the other terminal of the rotor motor 3 is connected to a motor current detection circuit 4. The output of the motor current detection circuit 4 is transmitted to the differential current detection circuit 5.
connected to. A rotor 2 having a rotary head 9 mounted on its drive shaft is mechanically connected to the rotor motor 3. Further, the output of the differential current detection circuit 5 is connected to the input of the head cleaning mechanism drive circuit 6. Furthermore, the output of the head cleaning mechanism drive circuit 6 is connected to the head cleaning mechanism 7. The head cleaning mechanism 7 comes into contact with or separates from the rotary head 9 mounted on the rotor 2 in response to a signal from a head cleaning mechanism drive circuit 6.
ここで第２図に示す如く、ロータ２に埋込まれ
た回転ヘツド９の周囲には、磁気テープ浮上用空
気吹出溝１０が設けられており、記録再生休止時
は、空気を吹出して、第３図に示す如く磁気テー
プ８を回転ヘツド９の表面より十分浮上させてい
る。浮上すきまは一般には10μｍ以上である。一
方、記録再生動作時においては、空気吹出溝１０
から空気を吹出さず、通常浮上すきまは１μｍ以
下であり、ロータモータ３の駆動電流は記録再生
休止時と同程度である。ところが回転ヘツドにゴ
ミが付着すると記録再生動作時に、十分な浮上す
きまが得られなくなり、磁気テープ８と回転ヘツ
ド２が接触し、ロータモータ３の電流が増大す
る。第４図は浮上時とテープ接触時でのテープ浮
上量とモータ電流との関係を示す図であり、横軸
にテープの浮上量を、縦軸にモータ電流をとつた
ものである。この図からもわかるように、モータ
電流はテープと回転ヘツドの接触時に増大するこ
とがわかる。したがつて、記録再生休止時と記録
再生動作時のロータモータ駆動電流差が一定値以
上となつたことを差電流検出回路５により検出し
てヘツド清掃機構駆動回路６に信号を送り、ヘツ
ド清掃機構７を動作させて、回転ヘツド９を清掃
すれば、磁気テープの損傷を最少限度におさえる
ことができる。 As shown in FIG. 2, an air blowing groove 10 for floating the magnetic tape is provided around the rotary head 9 embedded in the rotor 2, and air is blown out when recording and reproduction are stopped. As shown in FIG. 3, the magnetic tape 8 is sufficiently floated above the surface of the rotary head 9. The floating clearance is generally 10 μm or more. On the other hand, during the recording/reproducing operation, the air blowing groove 10
No air is blown out from the rotor, the flying clearance is usually 1 μm or less, and the drive current of the rotor motor 3 is about the same as when recording and reproduction are stopped. However, if dust adheres to the rotating head, a sufficient flying clearance cannot be obtained during recording and reproducing operations, and the magnetic tape 8 and the rotating head 2 come into contact with each other, causing an increase in the current flowing through the rotor motor 3. FIG. 4 is a diagram showing the relationship between the tape flying height and motor current during floating and tape contact, with the horizontal axis representing the tape flying height and the vertical axis representing the motor current. As can be seen from this figure, the motor current increases when the tape and rotating head come into contact. Therefore, the differential current detection circuit 5 detects that the difference in the rotor motor drive current between the recording/reproducing pause and the recording/reproducing operation exceeds a certain value, and sends a signal to the head cleaning mechanism drive circuit 6, which starts the head cleaning mechanism. 7 to clean the rotary head 9, damage to the magnetic tape can be kept to a minimum.
以上述べた如く、本発明方式により次の如き効
果を得ることができる。 As described above, the following effects can be obtained by the method of the present invention.
１ 回転ヘツド付着ゴミなどによる回転ヘツド・
磁気テープ接触に伴う磁気テープ損傷をいち早
く検出でき、磁気テープ損傷を防止できる。1 Rotating head due to dirt etc.
Damage to the magnetic tape due to contact with the magnetic tape can be detected quickly and damage to the magnetic tape can be prevented.
２ 浮上空気吹出しを行う記録再生休止時と、空
気吹出しを行なわない記録再生時の駆動電流差
を検出する方式であるため、ロータモータ自体
のバラツキの影響を除去できる。2. Since the method detects the difference in drive current between when recording/playback is stopped when air is blown out and during recording/playback when air is not blown, the influence of variations in the rotor motor itself can be eliminated.
第１図は本発明の一実施例を示すブロツク図、
第２図はロータの回転ヘツド周辺の空気吹出溝の
外観図、第３図は、ヘツド周辺の空気吹出溝と磁
気テープ間の相対関係を示す断面図、第４図は浮
上時とテープ接触時でのテープ浮上量とモータ電
流との関係を示す図である。
１……速度制御回路及び駆動回路、２……ロー
タ、３……ロータモータ、４……モータ電流検出
回路、５……差電流検出回路、６……ヘツド清掃
機構駆動回路、７……ヘツド清掃機構、８……磁
気テープ、９……回転ヘツド、１０……空気吹出
溝。
FIG. 1 is a block diagram showing one embodiment of the present invention;
Figure 2 is an external view of the air blowing grooves around the rotating head of the rotor, Figure 3 is a sectional view showing the relative relationship between the air blowing grooves around the head and the magnetic tape, and Figure 4 is when floating and in contact with the tape. FIG. 3 is a diagram showing the relationship between tape flying height and motor current at . DESCRIPTION OF SYMBOLS 1... Speed control circuit and drive circuit, 2... Rotor, 3... Rotor motor, 4... Motor current detection circuit, 5... Differential current detection circuit, 6... Head cleaning mechanism drive circuit, 7... Head cleaning Mechanism, 8... Magnetic tape, 9... Rotating head, 10... Air blowing groove.
Claims (1)
ヘツド用ロータモータの駆動電流の増大を検出
し、回転ヘツド清掃機構を駆動せしめることを特
徴とする磁気テープ損傷防止方式。1. A magnetic tape damage prevention method in a rotating head type magnetic tape device, which detects an increase in drive current of a rotary head rotor motor and drives a rotating head cleaning mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9736979A JPS5622210A (en) | 1979-08-01 | 1979-08-01 | Damage preventing system for magnetic tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9736979A JPS5622210A (en) | 1979-08-01 | 1979-08-01 | Damage preventing system for magnetic tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5622210A JPS5622210A (en) | 1981-03-02 |
| JPS6141045B2 true JPS6141045B2 (en) | 1986-09-12 |
Family
ID=14190585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9736979A Granted JPS5622210A (en) | 1979-08-01 | 1979-08-01 | Damage preventing system for magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5622210A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5884617U (en) * | 1981-12-04 | 1983-06-08 | 松下電器産業株式会社 | magnetic recording and reproducing device |
| JPS58135035U (en) * | 1982-03-04 | 1983-09-10 | 日本ビクター株式会社 | magnetic recording and reproducing device |
| US6624960B1 (en) * | 2000-03-10 | 2003-09-23 | Exabyte Corporation | Current sensing drum/cleaning wheel positioning method and apparatus for magnetic storage system |
-
1979
- 1979-08-01 JP JP9736979A patent/JPS5622210A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5622210A (en) | 1981-03-02 |
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