JPS5823338A - Helical scanning type tape recorder - Google Patents
Helical scanning type tape recorderInfo
- Publication number
- JPS5823338A JPS5823338A JP56120751A JP12075181A JPS5823338A JP S5823338 A JPS5823338 A JP S5823338A JP 56120751 A JP56120751 A JP 56120751A JP 12075181 A JP12075181 A JP 12075181A JP S5823338 A JPS5823338 A JP S5823338A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- capstan
- motor
- increased
- 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
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
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/43—Control or regulation of mechanical tension of record carrier, e.g. tape tension
Abstract
Description
【発明の詳細な説明】
本発明はヘリカルスキャン形ビデオテープレコーダにお
ける巻取り側リールモータの制御に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to control of a take-up reel motor in a helical scan video tape recorder.
ヘリカルスキャンビデオテープレコーダ（以下ＶＴＲと
称す）においては１例えばＴ ｙ ｐ ｅ’Ｊフォーマ
ットの１インチＶＴＲの場合、ヘッドドラム部のテープ
巻付角が大きいために生ずる摩擦係数や周囲湿度の影響
によってテープ張力が犬きく変化し、特にポータプル形
のようにトルクの、小さいキャプスタンモータを使用し
たｖＴＲＵ、 このテープ張力が異常に高く１例えば
標準テープ張力３００ｆに対し７００１になり、キャプ
スタンモータにかかる負荷の許容限界値が５００１とす
ると、過負荷のためにキャプスタン制御系のロック状態
が外れてしまい、正常な記録、再生ができなくなること
がある。In a helical scan video tape recorder (hereinafter referred to as a VTR), for example, in the case of a 1-inch Type-J format VTR, the tape winding angle at the head drum is large, resulting in a friction coefficient and the influence of ambient humidity. The tape tension changes rapidly, especially in vTRUs that use a capstan motor with a small torque such as a portapull type, where the tape tension is abnormally high (for example, 7001 compared to the standard tape tension of 300f), and the tape tension is applied to the capstan motor. If the allowable limit value of the load is 5001, the capstan control system may become unlocked due to overload, and normal recording and reproduction may not be possible.
本発明はこれらの欠点を除去するだめ、テープ張力が所
定の値以上になったことを、キャプスタンモータに流れ
る電流値によって検知し、この検知信号によって巻取り
側リールモータへの供給電子を増加させ、キャプスタン
の過負荷を減少させるようにしたものである。In order to eliminate these drawbacks, the present invention detects when the tape tension exceeds a predetermined value by the current value flowing through the capstan motor, and increases the supply of electrons to the take-up reel motor based on this detection signal. This is to reduce overload on the capstan.
以下本発明によるヘリカルスキャン形テープレコーダの
実施例を図面によって説明する。キャプスタンモータの
制御系は、誤差電圧増幅器３からの信号がモータ駆動増
幅器４に印加され−これによりキャプスタンモータ６が
回転し１回転検出器７からの検出信号が位相比較器２と
周波数弁別器５に印加され、基準信号１と比較された位
相比較器の出力信号と周波数弁別器の出力信号とが加算
されて誤差電圧増幅器３に印加され、キャプスタンモー
タ６を所定の状態に制御する。巻取り側リールモータの
制御系は、基準電圧１２がテープ張力検出器１３と誤差
電圧増幅器１４を介してモータ駆動増幅器１５に印加さ
れ、これにより巻取り側リールモータ１６を回転し、ヘ
リボット１７からの信号がテープ張力検出器１３に印加
され、テープを所定の張力に制御する。またキャプスタ
ンモータ６の電流回路に挿入した電流検出用抵抗８と電
流検出器９とアナログスイッチ１０と電圧発生回路１１
と電圧加算器１８は本発明による付加制御回路である。Embodiments of a helical scan type tape recorder according to the present invention will be described below with reference to the drawings. In the control system of the capstan motor, a signal from an error voltage amplifier 3 is applied to a motor drive amplifier 4, which causes the capstan motor 6 to rotate, and a detection signal from a one-rotation detector 7 is sent to a phase comparator 2 and a frequency discriminator. The output signal of the phase comparator and the output signal of the frequency discriminator, which are applied to the amplifier 5 and compared with the reference signal 1, are added together and applied to the error voltage amplifier 3, which controls the capstan motor 6 to a predetermined state. . In the control system of the reel motor on the take-up side, a reference voltage 12 is applied to a motor drive amplifier 15 via a tape tension detector 13 and an error voltage amplifier 14, which rotates the reel motor 16 on the take-up side. A signal is applied to the tape tension detector 13 to control the tape to a predetermined tension. Also, a current detection resistor 8, a current detector 9, an analog switch 10, and a voltage generation circuit 11 inserted into the current circuit of the capstan motor 6.
and voltage adder 18 are additional control circuits according to the invention.
ここでテτプ張力が増してキャプスタンモータ６の負荷
が大きくなると、抵抗８に流れる電流が増すので抵抗８
の両端電圧が高くなる。この電圧が所定値を超すと電流
検出器９の出力信号によつでマキログスイッチ１０をオ
ンし、電圧発生回路１１からの電圧と基準電圧１２とを
電圧加算器１８で加算する。Here, as the tape tension increases and the load on the capstan motor 6 increases, the current flowing through the resistor 8 increases, so the resistor 8
The voltage across both ends increases. When this voltage exceeds a predetermined value, the output signal of the current detector 9 turns on the Makilog switch 10, and the voltage from the voltage generating circuit 11 and the reference voltage 12 are added together by the voltage adder 18.
これにより巻取り側リールモータ１６の供給電圧が高く
なり、テープを引張る張力を強くできるので。This increases the voltage supplied to the take-up reel motor 16, making it possible to increase the tension that pulls the tape.
キャプスタンモータ６の過負荷を軽減することができる
。Overload on the capstan motor 6 can be reduced.
以上説明じたごとく本発明によれば、テープの摩擦係数
が大きく変動した場合でも、安定したキャプスタン制御
系を維持することができる。As explained above, according to the present invention, a stable capstan control system can be maintained even when the coefficient of friction of the tape varies greatly.
図は本発明の実施例によるヘリカルスキャン形テープレ
コーダのモータ制御系のブロック図である。
６：キャプスタンモータ、８：電流検出用抵抗。
９：電流検出器、１０：アナ口グスイノチ、１１：電子
発生回路、１６二巻取り側リールモータ、１８：電圧加
算器。The figure is a block diagram of a motor control system of a helical scan type tape recorder according to an embodiment of the present invention. 6: Capstan motor, 8: Current detection resistor. 9: Current detector, 10: Anaguchi Gusuinochi, 11: Electronic generation circuit, 16 Two-winding side reel motor, 18: Voltage adder.
Claims (1)
させるヘリカルスキャン形ビデオテープレコーダにおい
て、前記キャプスタンを駆動させるキャプスタンモータ
の電流値を検知し、この検知した電流値が所定値を超え
たとき、前記ビデオテープの巻取り側リールを駆動させ
るリールモータへの供給電圧を増加させて、前記キャプ
スタンの過負荷を減少させるように構成したことを特徴
とするヘリカルスキャン形テープレコーダ。In a helical scan video tape recorder in which a videotape is run at a predetermined speed by a capstan, a current value of a capstan motor that drives the capstan is detected, and when the detected current value exceeds a predetermined value, the 1. A helical scan type tape recorder, characterized in that the overload on the capstan is reduced by increasing the voltage supplied to a reel motor that drives a take-up reel of a videotape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56120751A JPS5823338A (en) | 1981-08-03 | 1981-08-03 | Helical scanning type tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56120751A JPS5823338A (en) | 1981-08-03 | 1981-08-03 | Helical scanning type tape recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5823338A true JPS5823338A (en) | 1983-02-12 |
Family
ID=14794080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56120751A Pending JPS5823338A (en) | 1981-08-03 | 1981-08-03 | Helical scanning type tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5823338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102034U (en) * | 1991-02-12 | 1992-09-03 | 愛知時計電機株式会社 | Pipe temperature measuring device |
-
1981
- 1981-08-03 JP JP56120751A patent/JPS5823338A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102034U (en) * | 1991-02-12 | 1992-09-03 | 愛知時計電機株式会社 | Pipe temperature measuring device |
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