JP2697177B2 - Magnetic writer - Google Patents
Magnetic writerInfo
- Publication number
- JP2697177B2 JP2697177B2 JP22514189A JP22514189A JP2697177B2 JP 2697177 B2 JP2697177 B2 JP 2697177B2 JP 22514189 A JP22514189 A JP 22514189A JP 22514189 A JP22514189 A JP 22514189A JP 2697177 B2 JP2697177 B2 JP 2697177B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- signal
- magnetic medium
- frequency
- writing
- 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
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- Digital Magnetic Recording (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、移動する磁気媒体に信号を書き込む磁気書
込み装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic writer for writing a signal on a moving magnetic medium.
［従来の技術］ 近年、磁気媒体は一定又は可変の情報を記録保持する
媒体として広く使用されている。このような磁気媒体の
利用現場では、記録内容を書き換えたい場合や、新しく
信号を書き込みたい場合がある。そのような場合に使用
される従来の磁気書込み装置は、書込みを行なおうとす
る磁気媒体（例えば磁気カード）をモータなどの搬送装
置により規定の一定速度で搬送し、その間に書込み用の
磁気ヘッドにより目的の信号を磁気記録する。[Related Art] In recent years, magnetic media have been widely used as media for recording and holding constant or variable information. At the site where such a magnetic medium is used, there are cases where it is desired to rewrite the recorded contents or to newly write a signal. A conventional magnetic writing apparatus used in such a case is such that a magnetic medium (for example, a magnetic card) to be written is transported at a specified constant speed by a transporting device such as a motor, and a magnetic head for writing is written during that time. To magnetically record a target signal.
［発明が解決しようとする課題］ しかし、磁気媒体の利用範囲が広がり、空間的制限や
価格の点で、また利用方法の点で上記搬送装置を組み込
めない場合がある。そのような場合、例えば利用者が磁
気媒体を手に持って磁気書込み部に搬送することにな
り、磁気媒体が規定の一定値で搬送されることを期待で
きない。[Problems to be Solved by the Invention] However, the range of use of the magnetic medium is widened, and there are cases where the above-described transport device cannot be incorporated in terms of space restrictions, cost, and usage. In such a case, for example, the user holds the magnetic medium in hand and conveys it to the magnetic writing unit, and it cannot be expected that the magnetic medium will be conveyed at a prescribed constant value.
磁気媒体では一般に、記録信号の空間周波数が所定値
範囲内にあることが必要であり、手で搬送する場合のよ
うに、磁気媒体の搬送速度がその都度異なる場合には、
従来例の磁気書込み装置では対応できない。In general, the spatial frequency of a recording signal needs to be within a predetermined value range in a magnetic medium, and when the transport speed of a magnetic medium is different each time, such as when transporting by hand,
The conventional magnetic writing device cannot cope.
また、磁気媒体の記録装置を具備する磁気書込み装置
であっても、搬送力に対する負荷量の異なる磁気媒体を
挿入する場合には、搬送速度が規定値から許容値以上に
外れることがありうる。このような現象は例えば、磁気
材料の特性及び位置については同じ規格を満たしても、
当該磁気媒体を支持するベース材の外形規格が異なるよ
うな場合や、磁気媒体の搬送がスムーズにいかない場合
等に起こり得る。従来例の磁気書込み装置では、このよ
うな場合に、所定の空間周波数範囲で信号を書き込むこ
とができない。Further, even in a magnetic writing device having a recording device for a magnetic medium, when inserting a magnetic medium having a different load with respect to the conveying force, the conveying speed may deviate from a specified value to an allowable value or more. Such a phenomenon, for example, even if the same standard is met for the properties and positions of magnetic materials,
This may occur when the external standard of the base material supporting the magnetic medium is different or when the magnetic medium is not smoothly transported. In such a case, the conventional magnetic writing device cannot write a signal in a predetermined spatial frequency range.
そこで本発明は、磁気媒体の広い範囲の搬送速度に対
応できる磁気書込み装置を提示することを目的とする。Accordingly, it is an object of the present invention to provide a magnetic writing device capable of handling a wide range of transport speeds of a magnetic medium.
［課題を解決するための手段］ 本発明に係る磁気書込み装置は、発振周波数を選択自
在な発振手段と、当該発振手段の出力周波数に従い、記
録媒体に書き込むべき信号を発生する信号発生手段と、
当該信号発生手段の出力信号を、一定電流レベルに調整
するレベル調整手段と、当該レベル調整手段の出力を電
磁変換する磁気ヘッドとからなり、磁気媒体の搬送速度
に応じて当該発振手段の発振周波数を選択することを特
徴とする。[Means for Solving the Problems] A magnetic writing apparatus according to the present invention comprises: an oscillating means capable of selecting an oscillating frequency; a signal generating means for generating a signal to be written to a recording medium according to an output frequency of the oscillating means;
An output signal of the signal generating means, a level adjusting means for adjusting the output level of the level adjusting means to a constant current level, and a magnetic head for electromagnetically converting the output of the level adjusting means. Is selected.
［作用］ 上記発振手段の発振周波数を磁気媒体の搬送速度に応
じて選択することにより、磁気媒体に書込まれる信号の
空間周波数を、磁気媒体の搬送速度に関わらず一定範囲
におさめることができる。また、上記レベル調整手段に
より、発振手段の発振周波数、即ち信号発生手段の出力
信号の周波数に関わらず、磁気ヘッドに印加される電流
レベルは一定に保たれる。従って、磁気媒体には、その
搬送速度に関わらず一定の磁界が印加され、一定強さの
信号が磁気記録される。[Operation] By selecting the oscillation frequency of the oscillating means according to the transport speed of the magnetic medium, the spatial frequency of the signal written on the magnetic medium can be kept within a certain range regardless of the transport speed of the magnetic medium. . Further, the level adjusting means keeps the current level applied to the magnetic head constant irrespective of the oscillation frequency of the oscillating means, that is, the frequency of the output signal of the signal generating means. Therefore, a constant magnetic field is applied to the magnetic medium regardless of the transport speed, and a signal of a constant strength is magnetically recorded.
［実施例］ 以下、図面を参照して本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例の概略構成ブロック図を示
す。第１図において、10は書き込み行なおうとする磁気
媒体、12は書込み用の磁気ヘッドである。磁気媒体10の
搬送速度は、磁気媒体に密接する送りローラ14,15の回
転から知ることができ、その搬送速度信号vsは、マイク
ロコンピュータからなる制御回路16に供給される。18は
周波数可変の発振回路、20は発振回路18の発振周波数を
指定するスイッチである。22は、発振回路18から出力さ
れる基準信号を基準として、制御回路16からのコード信
号から、磁気媒体10に書き込む信号を形成する信号発生
回路である。24は信号発生回路22の発生する信号の電流
値を後述する所定値に維持する可変利得の電流増幅回路
であり、ボリューム抵抗26の抵抗値を制御することで、
増幅利得を制御できるようになっている。FIG. 1 shows a schematic block diagram of an embodiment of the present invention. In FIG. 1, 10 is a magnetic medium to be written, and 12 is a magnetic head for writing. Conveying speed of the magnetic medium 10 can be known from the rotation of the feed rollers 14, 15 into close contact with the magnetic medium, the conveying speed signal v s is supplied to a control circuit 16 comprising a microcomputer. Reference numeral 18 denotes a variable frequency oscillation circuit, and reference numeral 20 denotes a switch for specifying the oscillation frequency of the oscillation circuit 18. Reference numeral 22 denotes a signal generation circuit that forms a signal to be written into the magnetic medium 10 from a code signal from the control circuit 16 with reference to a reference signal output from the oscillation circuit 18. Reference numeral 24 denotes a variable gain current amplifying circuit that maintains a current value of a signal generated by the signal generating circuit 22 at a predetermined value described later.
The amplification gain can be controlled.
以下、第１図の動作を詳細に説明する。制御回路16は
送りローラ15からの搬送速度信号vsにより、磁気媒体10
の搬送速度を知り、これに応じて、磁気媒体10に書き込
まれる信号の周波数が所定値の範囲に収まるようにスイ
ッチ20を制御して発振回路18の発振周波数を選択し、ま
た、磁気媒体10に所定大きさの磁界を印加できるよう
に、ボリューム抵抗26の抵抗値を選択して電流増幅回路
24の増幅率を選択する。発振回路18から出力される基準
信号は、信号発生回路22及び制御回路16に印加され、制
御回路16はこの基準信号で決まるタイミングで、磁気媒
体10に書き込むべきコード信号を信号発生回路22に印加
する。信号発生回路22は発振回路18からの基準信号に従
い、制御回路16からのコード信号から、該基準信号の周
波数の書込み信号を形成し、出力する。Hereinafter, the operation of FIG. 1 will be described in detail. The conveying speed signal v s of the control circuit 16 sends roller 15, the magnetic medium 10
In response to this, the switch 20 is controlled so that the frequency of the signal written to the magnetic medium 10 falls within a predetermined value range, and the oscillation frequency of the oscillation circuit 18 is selected. The current amplifying circuit is selected by selecting the resistance value of the volume resistor 26 so that a magnetic field of a predetermined magnitude can be applied to the
Select 24 amplification factors. The reference signal output from the oscillation circuit 18 is applied to the signal generation circuit 22 and the control circuit 16, and the control circuit 16 applies a code signal to be written to the magnetic medium 10 to the signal generation circuit 22 at a timing determined by the reference signal. I do. The signal generation circuit 22 forms a write signal of the frequency of the reference signal from the code signal from the control circuit 16 according to the reference signal from the oscillation circuit 18 and outputs the signal.
電流増幅回路24は、ボリューム抵抗26の選択された抵
抗値による電流増幅率で、信号発生回路22の出力信号を
電流増幅する。磁気ヘッド12はリアクタンス素子であ
り、印加電流の周波数が高い程、そのインピーダンスも
高くなる。他方、磁気媒体10に同じ磁界を印加するに
は、周波数に関わらず磁気ヘッド12への印加電流を一定
に保つ必要がある。そこで、発振回路18の発振周波数に
かかわらず磁気ヘッド12の入力電流が一定になるよう
に、制御回路16が、ボリューム抵抗26により電流増幅回
路24の電流増幅率を制御している。The current amplification circuit 24 current-amplifies the output signal of the signal generation circuit 22 at a current amplification rate according to the selected resistance value of the volume resistor 26. The magnetic head 12 is a reactance element, and the impedance increases as the frequency of the applied current increases. On the other hand, in order to apply the same magnetic field to the magnetic medium 10, it is necessary to keep the current applied to the magnetic head 12 constant regardless of the frequency. Therefore, the control circuit 16 controls the current amplification factor of the current amplification circuit 24 by the volume resistor 26 so that the input current of the magnetic head 12 becomes constant regardless of the oscillation frequency of the oscillation circuit 18.
電流増幅回路24の出力電流は磁気ヘッド12に印加さ
れ、磁気媒体10に磁気記録される。The output current of the current amplification circuit 24 is applied to the magnetic head 12, and is magnetically recorded on the magnetic medium 10.
以上のようにして、本実施例によれば、磁気媒体10の
搬送速度のより広い範囲にわたって、所定空間周波数の
範囲内の信号を書き込むことができる。As described above, according to the present embodiment, it is possible to write a signal within a predetermined spatial frequency range over a wider range of the transport speed of the magnetic medium 10.
上記実施例では、一般的な信号を書き込む汎用的な場
合を例に説明しているが、本発明は、それ以外の用途に
も適用できる。例えば、上記のような磁気媒体の製造プ
ロセスでの磁気媒体の検査装置にも適用できる。磁気媒
体製造プロセスでは、例えば、磁性材料を混入した溶剤
をベース材（例えばプラスチック、紙など）に塗布し、
その後、乾燥させる。そして、乾燥後の幾つかの又は全
部の製品について磁気特性を検査し、目的の磁気特性に
なるように、磁性材料の混入率、塗布厚み、ベース材の
搬送速度などの製造条件を決定し、そのように変更し
て、再び、塗布及び乾燥の処理を進める。即ち、通常
は、各種の製造条件を調整しながら、製造速度を徐々に
最大速度に上げていくことになる。In the above embodiment, a general-purpose case of writing a general signal is described as an example, but the present invention can be applied to other uses. For example, the present invention can be applied to a magnetic medium inspection apparatus in the above-described magnetic medium manufacturing process. In the magnetic medium manufacturing process, for example, a solvent mixed with a magnetic material is applied to a base material (eg, plastic, paper, etc.),
Then, it is dried. Then, inspect the magnetic properties of some or all of the products after drying, and determine the manufacturing conditions such as the mixing ratio of the magnetic material, the coating thickness, and the transport speed of the base material so that the desired magnetic properties are obtained. After such change, the application and drying processes are performed again. That is, usually, the production speed is gradually increased to the maximum speed while adjusting various production conditions.
製造しようとする磁性媒体がビデオ・テープのように
連続的な材料である場合、及び磁気カードのように小さ
な製品に分離される場合でも、磁気特性検査時には連続
状態になる場合などでは、乾燥後の製品の磁気特性検査
のために、当該製品を、製造プロセスの搬送速度とは異
なる一定速度で搬送することはできない。このような場
合に、本発明の磁気書込み装置を使用すれば、製造速度
の変化に関わらず、一定空間周波数範囲の検査用信号を
書き込みことができる。但し、このような用途では、磁
気媒体10の搬送速度vsの変化は予め分かっており、搬送
速度vsの変化もそれほど急激でないので、発振回路18の
発振周波数及び、ボリューム抵抗26による電流増幅回路
24の電流増幅率のそれぞれについて、複数の選択肢を用
意しておき、搬送速度vsの表示値により操作員が手動選
択するようにしてもよい。If the magnetic medium to be manufactured is a continuous material such as a video tape, or if it is separated into small products such as a magnetic card, but if it is in a continuous state at the time of magnetic property inspection, etc. Cannot be transported at a constant speed different from the transport speed of the manufacturing process due to the magnetic property inspection of the product. In such a case, the use of the magnetic writing apparatus of the present invention enables writing of a test signal in a constant spatial frequency range regardless of a change in manufacturing speed. However, in such applications, the change in the conveying speed v s of the magnetic medium 10 is known in advance, because not so abrupt also change in the conveyance speed v s, the oscillation frequency of the oscillation circuit 18 and the current amplification by volume resistance 26 circuit
For each of the current amplification factor of 24, are prepared a plurality of options, the operator by the display value of the conveying speed v s may be manually selected.
なお、電流増幅回路24の出力電流レベルは、必ずしも
厳密に一定である必要はなく、信号周波数に対して許容
範囲内で一定（例えば、読取り時に支障のない範囲で一
定）であればよいことはいうまでもない。The output current level of the current amplifying circuit 24 does not necessarily have to be strictly constant, but may be constant within an allowable range with respect to the signal frequency (for example, constant within a range that does not hinder reading). Needless to say.
［発明の効果］ 以上の説明から容易に理解できるように、本発明によ
れば、磁気媒体のより広い搬送速度にも対応でき、搬送
速度に関わらず一定強さの磁界を所定の空間周波数範囲
内におさまるように磁気媒体に印加できる。[Effects of the Invention] As can be easily understood from the above description, according to the present invention, it is possible to cope with a wider transport speed of a magnetic medium and to apply a magnetic field having a constant strength to a predetermined spatial frequency range regardless of the transport speed. Can be applied to the magnetic medium to fit within.
第１図は本発明の一実施例の構成ブロック図である。 10:磁気媒体、12:磁気ヘッド、14,15:送りローラ、16:
制御回路、18:発振回路、20:スイッチ、22:信号発生回
路、24:電流増幅回路、26:ボリューム抵抗FIG. 1 is a configuration block diagram of one embodiment of the present invention. 10: magnetic medium, 12: magnetic head, 14, 15: feed roller, 16:
Control circuit, 18: oscillation circuit, 20: switch, 22: signal generation circuit, 24: current amplification circuit, 26: volume resistance
Claims (2)
込み装置であって、発振周波数を選択自在な発振手段
と、当該発振手段の出力周波数に従い、記録媒体に書き
込むべき信号を発生する信号発生手段と、当該信号発生
手段の出力信号を、一定電流レベルに調整するレベル調
整手段と、当該レベル調整手段の出力を電磁変換する磁
気ヘッドとからなり、磁気媒体の搬送速度に応じて当該
発振手段の発振周波数を選択することを特徴とする磁気
書込み装置。1. A magnetic writing apparatus for writing a signal to a moving magnetic medium, comprising: an oscillating means capable of selecting an oscillating frequency; and a signal generating means for generating a signal to be written to a recording medium in accordance with an output frequency of the oscillating means. A level adjusting means for adjusting the output signal of the signal generating means to a constant current level; and a magnetic head for electromagnetically converting the output of the level adjusting means. A magnetic writing device for selecting an oscillation frequency.
出手段と、当該搬送速度に従い、上記発振手段の発振周
波数を制御する制御手段とを具備する特許請求の範囲第
（１）項に記載の磁気書込み装置。2. The apparatus according to claim 1, further comprising speed detecting means for detecting a transport speed of said magnetic medium, and control means for controlling an oscillation frequency of said oscillating means according to said transport speed. Magnetic writer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22514189A JP2697177B2 (en) | 1989-08-31 | 1989-08-31 | Magnetic writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22514189A JP2697177B2 (en) | 1989-08-31 | 1989-08-31 | Magnetic writer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0388107A JPH0388107A (en) | 1991-04-12 |
| JP2697177B2 true JP2697177B2 (en) | 1998-01-14 |
Family
ID=16824595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22514189A Expired - Lifetime JP2697177B2 (en) | 1989-08-31 | 1989-08-31 | Magnetic writer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2697177B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4530205B2 (en) * | 2004-06-23 | 2010-08-25 | 株式会社タニタ | Polarographic densitometer |
-
1989
- 1989-08-31 JP JP22514189A patent/JP2697177B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0388107A (en) | 1991-04-12 |
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