JPS62173614A - Head clogging detector - Google Patents
Head clogging detectorInfo
- Publication number
- JPS62173614A JPS62173614A JP1612486A JP1612486A JPS62173614A JP S62173614 A JPS62173614 A JP S62173614A JP 1612486 A JP1612486 A JP 1612486A JP 1612486 A JP1612486 A JP 1612486A JP S62173614 A JPS62173614 A JP S62173614A
- Authority
- JP
- Japan
- Prior art keywords
- output
- head
- level
- head clogging
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000035945 sensitivity Effects 0.000 claims abstract description 13
- 230000007423 decrease Effects 0.000 claims description 9
- 230000011664 signaling Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000007493 shaping process Methods 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
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
- G11B15/087—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/10—Indicating arrangements; Warning arrangements
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、磁気記録再生装置に使用できるヘッド目詰ま
り検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a head clogging detection device that can be used in a magnetic recording/reproducing device.
従来の技術
近年、一体型、ポータプルの磁気記録再生装置の使用回
数が増大し、少しの時間で重要な場面を記録する機会も
多くなってきており、常に記録信号が記録されているか
どうかを判断し警告することが大切になってきている。Conventional technology In recent years, integrated and portable magnetic recording and reproducing devices have been used more frequently, and there are more opportunities to record important scenes in a short amount of time. It has become important to warn people.
記録中に無記録状態を発生させる原因として、ヘッド目
詰りがあげられるが、再生機を使用してこの状態を確認
する方法では時間的に余裕がなく、記録中に記録信号を
検出してヘッド目詰まりを判断し警告する機能が必要と
される。再生中に於いても、この機能は必要とされてい
る。Head clogging is one of the causes of a no-recording state during recording, but there is no time to check this state using a playback device, and the head is clogged by detecting the recording signal during recording. A function is required to determine clogging and provide a warning. This function is required even during playback.
以下、図面を参照しながら、上述した従来のヘッド目詰
まり検出装置の一例について説明する。Hereinafter, an example of the above-mentioned conventional head clogging detection device will be described with reference to the drawings.
第３図、第４図は従来のヘッド目詰まり検出装置のブロ
ック図と動作を示すものである。第３図に於いて、３１
は固定ヘッド、３２は増幅器、３３はフィルタ、３４は
再生信号検出器、３６は基準電圧発生器、３６は比較器
、３７はパルス伸長器、３８はＮＡＮＤゲート、３９は
パルス整形器である。FIGS. 3 and 4 show a block diagram and operation of a conventional head clogging detection device. In Figure 3, 31
32 is a fixed head, 32 is an amplifier, 33 is a filter, 34 is a reproduced signal detector, 36 is a reference voltage generator, 36 is a comparator, 37 is a pulse stretcher, 38 is a NAND gate, and 39 is a pulse shaper.
以上の様に構成された従来のヘッド目詰まり検出装置に
ついて、以下この動作について説明する。The operation of the conventional head clogging detection device configured as described above will be described below.
まず、固定ヘッド３１で各記録トラックの一部を再生し
増幅器３２でこの再生信号を増幅してフィルタ３３で不
要成分を除去する。第４図量はこの出力を示すものであ
る。この出力から再生信号検出器３４で第４図すの様に
再生信号を検出し、基準電圧発生器３５で基準電圧を発
生させ、比較器３６で比較することによって第４図量の
様に、再生信号のレベルの低下を検出できる。ヘッド目
詰まりにより無記録状態が発生した場合、第４図量の様
に比較器３６の出力でこの期間に相当するパルスが発生
する。尚、再生信号より基準電圧を発生させているため
、再生信号の絶対レベルが低下したとしても、基準電圧
も再生信号と同様に低下して検出感度は変化せず、記録
しない無記録状態では目詰まりと判断しない様になって
因る。比較器３６出力は、パルス伸長器３７で第４図量
の様に一定量伸長され、ＮＡＮＤゲート３８で比較器３
６出力とＮＡＲＤさね、第４図量の様なヘッド目詰まり
信号を発生する。尚、比較器３６の出力幅がパルス伸長
器３７の出力幅よりも短かい場合は、ＮＡＮＤゲート３
８出力は出力されない。First, a fixed head 31 reproduces a portion of each recording track, an amplifier 32 amplifies this reproduced signal, and a filter 33 removes unnecessary components. Figure 4 shows this output. From this output, the reproduced signal is detected by the reproduced signal detector 34 as shown in FIG. 4, the reference voltage generator 35 generates a reference voltage, and the comparator 36 compares it. A decrease in the level of the reproduced signal can be detected. When a non-recording state occurs due to head clogging, a pulse corresponding to this period is generated in the output of the comparator 36 as shown in the fourth figure. Furthermore, since the reference voltage is generated from the reproduced signal, even if the absolute level of the reproduced signal decreases, the reference voltage will also decrease in the same way as the reproduced signal, and the detection sensitivity will not change. This is because they don't judge it as a blockage. The output of the comparator 36 is expanded by a certain amount in the pulse expander 37 as shown in Figure 4, and the output of the comparator 3 is
6 output and NARD, a head clogging signal as shown in Figure 4 is generated. Note that if the output width of the comparator 36 is shorter than the output width of the pulse expander 37, the NAND gate 3
8 output is not output.
パルス伸長器３７の伸長量を変化させることにより、再
生信号の低下レベルの幅を検出する感度を変化させるこ
とが可能である。パルス整形器３９は、ＮＡＮＤゲート
３８を第４図量の様に一定量伸長させ警告するパルスに
整形し出力する。By changing the amount of expansion by the pulse expander 37, it is possible to change the sensitivity for detecting the width of the level of decline in the reproduced signal. The pulse shaper 39 stretches the NAND gate 38 by a certain amount as shown in FIG. 4, shapes the pulse into a warning pulse, and outputs the pulse.
発明が解決しようとする問題点
しかしながら上記の様な構成では、固定ヘッドを使用し
ているため各記録トラックの一部分しか検出しておらず
、記録トラックのうち検出していない部分がヘッド目詰
まりによって一定時間無記録状態になった場合、また時
間幅の検出には一定時間のパルス幅と比較しているため
、この時間内で短時間での無記録状態が連続して発生し
た場合については、ヘッド目詰まりと判断し警告するこ
とは不可能であるという問題を有していた。Problems to be Solved by the Invention However, in the above configuration, since a fixed head is used, only a portion of each recording track is detected, and the portion of the recording track that is not detected may be affected by head clogging. If there is no recording for a certain period of time, and since the time width is detected by comparing it with the pulse width of a certain period of time, if no recording occurs for a short period of time, The problem is that it is impossible to determine that the head is clogged and issue a warning.
本発明は上記問題点に鑑み、再生信号検出を固定ヘッド
より回転ヘッドにし、記録トラック全体を常に監視し再
生信号の低下レベル時間幅の検出については、一定時間
パルスとの比較から低下レベルの検出パルスを積分し基
準電圧と比較して検出感度を制御する様にし、短時間の
連続した無記録状態が発生した場合、積分値が積算され
て下降し、再生信号レベルが低下したと判断する様にし
て、記録トラック全体を監視し、短時間の連続した無記
録状態が発生した場合でもヘッド目詰まりが発生したと
判断し警告できる様にしたヘッド目詰まり検出装置を提
供するものである。In view of the above problems, the present invention uses a rotating head instead of a fixed head to detect the reproduced signal, constantly monitors the entire recording track, and detects the time width of the decreased level of the reproduced signal by comparing it with a fixed time pulse. The detection sensitivity is controlled by integrating the pulse and comparing it with a reference voltage, so that if a short period of continuous non-recording occurs, the integrated value is integrated and falls, and it is determined that the playback signal level has decreased. To provide a head clogging detection device which monitors the entire recording track and can determine that head clogging has occurred and issue a warning even when a short period of continuous non-recording occurs.
問題点を解決するだめの手段
上記問題点を解決するために本発明のヘッド目詰まり検
出装置は、記録トラック全体の再生信号を回転ヘッドか
ら検出し、この信号レベルの低下を検出する手段と、上
記信号の低下レベルの時間幅を検出する手段とを備え、
上記時間幅の検出感度を制御することによって、ヘッド
目詰まりの発生を検出し警告する構成を備えたものであ
る。Means for Solving the Problems In order to solve the above problems, the head clogging detection device of the present invention includes means for detecting the reproduction signal of the entire recording track from the rotating head and detecting a decrease in the signal level; and means for detecting the time width of the drop level of the signal,
By controlling the detection sensitivity of the above-mentioned time width, occurrence of head clogging is detected and a warning is provided.
作用
本発明は上記した構成によって、固定ヘッドが回転ヘッ
ドとなり上記回転ヘッドが記録トラック全体を監視して
ヘッド目詰まりを検出でき、上記ヘッドからの再生出力
信号を自動利得制御回路に通過させることによって、再
生出力信号レベルの低下の検出が、上記信号レベルの絶
対レベルに影響されない様にし、上記検出パルスを積分
し基準電圧と比較して検出感度を制御することによって
、再生信号の低下レベルの時間幅が一定時間を越えた場
合、また、短時間で連続して再生出力信号の低下が発生
した場合でもヘッドの目詰まりを検出し警告することが
可能となる。According to the above-described structure, the fixed head becomes a rotary head, and the rotary head monitors the entire recording track to detect head clogging, and the reproduced output signal from the head is passed through an automatic gain control circuit. , the detection of a drop in the playback output signal level is not affected by the absolute level of the signal level, and the detection pulse is integrated and compared with a reference voltage to control the detection sensitivity, thereby determining the time of the drop level of the playback signal. Even if the width exceeds a certain period of time, or if a drop in the reproduced output signal occurs continuously in a short period of time, it is possible to detect clogging of the head and issue a warning.
実施例
以下、本発明の実施例のヘッド目詰まり検出装置につい
て図面を参照しながら説明する。第１図は本発明の実施
例のブロック図を示すものである。EXAMPLE Hereinafter, a head clogging detection device according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of the invention.
第１図において、１１は回転ヘッド、１２は増幅器、１
３は自動利得制御装置、１４は再生信号検出器、１６は
基準電圧発生器、１６は比較器、１７は積分器、１８は
基準電圧発生器、１９は比較器、２ｏは整流器、２１は
基準電圧発生器、２２は比較器である。In FIG. 1, 11 is a rotating head, 12 is an amplifier, 1
3 is an automatic gain control device, 14 is a reproduced signal detector, 16 is a reference voltage generator, 16 is a comparator, 17 is an integrator, 18 is a reference voltage generator, 19 is a comparator, 2o is a rectifier, 21 is a reference The voltage generator 22 is a comparator.
以上の様に構成されたヘッド目詰まり検出装置について
、以下、第２図を用いてその動作を説明する。The operation of the head clogging detection device configured as described above will be described below with reference to FIG. 2.
まず、第２図は再生出力信号レベルが一定時間低下した
時の本実施例の動作を示すものであって、回転ヘッド１
１によって記録トラック全体を常に監視し検出しておシ
、再生出力は増幅器１２で増幅さ九自動利得制御装ｆｉ
ｉ１３で常に一定レベルの出力になる様に制御される。First, FIG. 2 shows the operation of this embodiment when the reproduced output signal level decreases for a certain period of time.
The entire recording track is constantly monitored and detected by the amplifier 12, and the playback output is amplified by the amplifier 12.
i13 is controlled so that the output is always at a constant level.
回転ヘッド１１の再生出力レベルの絶対量が変化しても
、自動利得制御装置１３で一定出力になる様に制御して
いるため、比較器１６での検出感度が変化しない様にな
っている。自動利得制御装置１３出力は、再生信号検出
器１４で第２図すの様に検出され、基準電圧発生器１５
の出力の比較笛゛圧と比較器１６で比較される。第２図
ａの様な再生出力信号が発生した場合、比較器１６の出
力は第２図Ｃの様に出力される。この出力は積分器１了
で第２図ｄの様に積分され、基準電圧発生器１８の出力
の比較電圧と比較器１９で比較され、第２図ｅの様に出
力される。再生出力信号の低下レベルの時間幅が短かい
場合は、積分器１７の出力が基準電圧発生器１８出力の
比較電圧まで到達せず、ヘッド目詰甘り発生とは検出し
ない。しかし、この状態が連続して発生した場合は、積
分器１７の出力が積算され、基準電圧発生器１８の出力
の比較電圧まで到達してヘッド目詰まり発生を検出でき
る。積分器１７の積分時間を変化させることで再生出力
信号の低下レベルの時間幅を検出する感度を制御できる
。比較器１９の出力は整流器２０で第２図ｆの様に整流
され、基準電圧発生器２１出力の比較電圧と比較器２２
で比較され第２図ｑの様にヘッド目詰まり検出パルスを
発生し警告する様に動作する。整流器２０の出力の放電
時間を制御することによってヘッド目詰まｂｓ出パルス
の出力幅を変化させることが可能である。Even if the absolute amount of the reproduction output level of the rotary head 11 changes, since the automatic gain control device 13 controls the output to be constant, the detection sensitivity of the comparator 16 does not change. The output of the automatic gain control device 13 is detected by the reproduced signal detector 14 as shown in FIG.
The comparator 16 compares the output of the pressure with the comparative whistle pressure. When a reproduced output signal as shown in FIG. 2A is generated, the output of the comparator 16 is output as shown in FIG. 2C. This output is integrated by an integrator 1, as shown in FIG. 2d, and compared with the comparison voltage output from the reference voltage generator 18 by a comparator 19, and output as shown in FIG. 2e. If the time width of the decreasing level of the reproduced output signal is short, the output of the integrator 17 does not reach the comparison voltage of the output of the reference voltage generator 18, and the occurrence of head clogging is not detected. However, if this condition occurs continuously, the output of the integrator 17 is integrated and reaches the comparison voltage of the output of the reference voltage generator 18, making it possible to detect the occurrence of head clogging. By changing the integration time of the integrator 17, the sensitivity for detecting the time width of the drop level of the reproduced output signal can be controlled. The output of the comparator 19 is rectified by the rectifier 20 as shown in FIG.
It operates to generate a head clogging detection pulse and issue a warning as shown in FIG. 2q. By controlling the discharge time of the output of the rectifier 20, it is possible to change the output width of the head clogging BS output pulse.
尚、本実施例に於いて、自動利得制御装置１３、再生信
号検出器１４、基準電圧発生器１６、比較器１６を用い
て再生出力信号レベルの低下を検出する様にしたが、従
来例の様に再生信号検出器３４、基準電圧発生器３６、
比較器３６を用いて検出してもよい。In this embodiment, the automatic gain control device 13, the reproduced signal detector 14, the reference voltage generator 16, and the comparator 16 are used to detect a decrease in the reproduced output signal level. Similarly, a reproduced signal detector 34, a reference voltage generator 36,
The comparator 36 may also be used for detection.
また、整流器２０．基準電圧発生器２１、比較器２２を
用いてパルス整形をしたが、パルス伸長器を用いてもよ
ｌ／″１゜
発明の効果
以上の様に本発明によれば、記録トラック全体の再生出
力を回転ヘッドで常に検出でき、また、この信号レベル
の低下が短時間で連続して発生した場合についても、検
出感度を制御することによってヘッド目詰まりと判断し
警告できるといったすぐれた効果を得ることができる。In addition, the rectifier 20. Although pulse shaping is performed using the reference voltage generator 21 and comparator 22, a pulse stretcher may also be used.Effects of the Invention As described above, according to the present invention, the reproduction output of the entire recording track is can be constantly detected by the rotating head, and even if this signal level decrease occurs continuously in a short period of time, by controlling the detection sensitivity, it can be determined that the head is clogged and a warning can be obtained. I can do it.
第１図は本発明の一実施例のヘッド目詰甘り検出装置の
ブロック図、第２図は第１図の動作を示す波形図、第３
図は従来のヘッド目詰まり検出装置のブロック図、第４
図は第３図の動作を示すだめのヘッド軌跡と波形との状
態を示す対応図である。
１１・・・・・・回転ヘッド、１２・・・・・・増幅器
、１３・・・・・・自動利得制御装置、１４・・・・・
再生信号検出器、１６・・・・・・基準電圧発生器、１
６・・・・・・比較器、１７・・・・・・積分器、１８
・・・・・・基準電圧発生器、１９・・・・・・比較器
、２ｏ・・・・・・整流器、２１・・・・・・基準電圧
発生器、２２・・・・・・比較器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第２
図
（Ｊ）
第４図
（Ｊ）FIG. 1 is a block diagram of a head clogging detecting device according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing the operation of FIG. 1, and FIG.
The figure is a block diagram of a conventional head clogging detection device.
This figure is a correspondence diagram showing the state of the head trajectory and waveforms showing the operation of FIG. 3. 11...Rotating head, 12...Amplifier, 13...Automatic gain control device, 14...
Reproduction signal detector, 16...Reference voltage generator, 1
6... Comparator, 17... Integrator, 18
...Reference voltage generator, 19...Comparator, 2o...Rectifier, 21...Reference voltage generator, 22...Comparison vessel. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure (J) Figure 4 (J)
Claims (1)
ク全体の再生信号のレベルの低下を検出する手段と、上
記再生信号の低下レベルの時間幅を検出する手段と、上
記時間幅の検出感度を制御する手段とを有し、上記検出
感度を制御する手段によりヘッドの目詰まりが発生した
という信号を出力することを特徴とするヘッド目詰まり
検出装置。Means for detecting a decrease in the level of a reproduction signal of the entire recording track detected by a rotary head of a magnetic recording and reproducing device, means for detecting a time width of the lower level of the reproduction signal, and controlling the detection sensitivity of the time width. A head clogging detection device comprising means for controlling the detection sensitivity, and outputting a signal indicating that head clogging has occurred by the means for controlling the detection sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1612486A JPS62173614A (en) | 1986-01-28 | 1986-01-28 | Head clogging detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1612486A JPS62173614A (en) | 1986-01-28 | 1986-01-28 | Head clogging detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62173614A true JPS62173614A (en) | 1987-07-30 |
Family
ID=11907757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1612486A Pending JPS62173614A (en) | 1986-01-28 | 1986-01-28 | Head clogging detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62173614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5168412A (en) * | 1989-06-28 | 1992-12-01 | Toan Doan | Surface interference detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898830A (en) * | 1981-12-07 | 1983-06-11 | Nec Corp | Detecting circuit for wear of magnetic head |
| JPS5914121A (en) * | 1982-07-15 | 1984-01-25 | Matsushita Electric Ind Co Ltd | Magnetic head for detecting of head clogging |
-
1986
- 1986-01-28 JP JP1612486A patent/JPS62173614A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898830A (en) * | 1981-12-07 | 1983-06-11 | Nec Corp | Detecting circuit for wear of magnetic head |
| JPS5914121A (en) * | 1982-07-15 | 1984-01-25 | Matsushita Electric Ind Co Ltd | Magnetic head for detecting of head clogging |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5168412A (en) * | 1989-06-28 | 1992-12-01 | Toan Doan | Surface interference detector |
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