KR910005512Y1 - Erasing circuit for floppy disc driver - Google Patents

Erasing circuit for floppy disc driver Download PDF

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Publication number
KR910005512Y1
KR910005512Y1 KR2019880012275U KR880012275U KR910005512Y1 KR 910005512 Y1 KR910005512 Y1 KR 910005512Y1 KR 2019880012275 U KR2019880012275 U KR 2019880012275U KR 880012275 U KR880012275 U KR 880012275U KR 910005512 Y1 KR910005512 Y1 KR 910005512Y1
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South Korea
Prior art keywords
coil
erasing
transistor
erase
current
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KR2019880012275U
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Korean (ko)
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KR900003700U (en
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장정환
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삼성전자 주식회사
안시환
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Priority to KR2019880012275U priority Critical patent/KR910005512Y1/en
Publication of KR900003700U publication Critical patent/KR900003700U/en
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    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/024—Erasing
    • 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
    • G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
    • G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0026—Pulse recording
    • G11B2005/0029—Pulse recording using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface

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  • Digital Magnetic Recording (AREA)

Abstract

내용 없음.No content.

Description

소자기능을 겸한 플로피 디스크 드라이버의 소거회로Erase Circuit for Floppy Disk Driver with Device Function

제 1 도는 종래의 소거회로도.1 is a conventional erase circuit diagram.

제 2 도는 본 고안의 소자기능을 겸한 소거회로도.2 is an erase circuit diagram that also serves as an element of the present invention.

제 3 도는 제 2 도의 소거코일에 흐르는 전류파형도.3 is a waveform diagram of current flowing through the elimination coil of FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

L1: 소거코일 A : 소자회로L 1 : erase coil A: device circuit

본 고안은 소거 후 플로피 디스크 드라이버(Floppy Disk Driver, FDD)의 소자헤드에 유기되는 잔류자계를 제거하는 소자 기능을 겸한 소거회로에 관한 것이다.The present invention relates to an erase circuit having a device function to remove residual magnetic fields induced in an element head of a floppy disk driver (FDD) after erasing.

페라이트 자계헤드(Ferrite Magnetic Head)를 이용하는데 있어서, 불필요한 자화문제가 오랫동안 계속되고 있다.In using a ferrite magnetic head, unnecessary magnetization problems continue for a long time.

지금까지의 문제는 마그네틱 헤드의 기입/독촉 헤드의 코어가 아닌 소거헤드의 구조에 의해 잔류자계(Residual Magnetism)가 발생되는 것이었다. 이것은 잔류자계에 의한 실험에 의해 이미 확인된 것으로 이실험은 기입된 한 테스트 트랙과 그 트랙의 진폭(Ampli-tude)을 관찰하기 위해 헤드를 안,밖 방향으로 천천히 일정량을 움직인 다음 그 테스트 트랙의 진폭을 다시 측정하면 이때 독출 출력진폭의 차이가 발생하고 소거헤드의 잔류자계에 의한 진폭의 변화가 생겨 기록된 데이터를 재생할 때 에러가 유발되었다.Until now, the problem has been that residual magnetism is generated by the structure of the erase head rather than the core of the write / dunning head of the magnetic head. This has already been confirmed by experiments by residual magnetic field, which slowly moves the head in and out a certain amount to observe the test track and the amplitude (Ampli-tude) of the track and then the test track. When measuring the amplitude of, the difference of read output amplitude occurred and the change of amplitude caused by the residual magnetic field of the erase head caused error when reproducing recorded data.

종래의 FDD의 소거회로가 제 1 도에 도시되어 있다.The erasing circuit of the conventional FDD is shown in FIG.

트랜지스터(Q1)의 베이스에 신호가 인가되어 온이되면 저항(R1)을 통해 센터 탭(Center tap)으로부터 인가되는 전류가 트랜지스터(Q1)를 통해 접지로 흐르게 된다.When a signal is applied to the base of the transistor Q 1 , a current applied from the center tap through the resistor R 1 flows to the ground through the transistor Q 1 .

따라서, 소거헤드의 코일(L1)에 전류가 흘러 기록된 신호가 소거된다Therefore, a current flows through the coil L 1 of the erase head and the recorded signal is erased.

소거헤드에 유기된 잔류자계가 실제 기록된 데이터에 영향을 주어 기록된 데이터의 재생시 에러가 발생하게 되는 문제점이 있었다.The residual magnetic field induced in the erase head affects the actually recorded data, causing an error in reproducing the recorded data.

본 고안은 소거 후 소거헤드에 유기된 전류자계를 제거하여 기록된 데이터를 정확하게 재생시키는 소자기능을 겸한 FDD의 소거회로를 제공함에 있다.The present invention provides an FDD erasing circuit that functions as an element function to accurately reproduce recorded data by removing a current magnetic field induced in the erasing head after erasing.

이하에 첨부된 도면에 의거하여 본 고안의 실시예를 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제 2 도는 본 고안의 실시예에 따른 회로도로서, 종래의 소거회로에 콘덴서(C1), 저항(R1-R4) 및 트랜지스터(Q2)로 구성된 소자기능을 하는 회로(A)를 추가한 것이다.FIG. 2 is a circuit diagram according to an embodiment of the present invention, and adds a circuit A functioning as a device composed of a capacitor C 1 , a resistor R 1 -R 4 , and a transistor Q 2 to a conventional erasing circuit. It is.

본 고안에서는 소거코일(L1)이 접지에 연결되고, 트랜지스터(Q2)의 에미터에 센터 탭(CT)을 연결하며 콜렉터에 저항(R2)을 통해 저항(R1) 및 콘덴서(C1)를 연결하여서, 트랜지스터(Q1)가 온이되면 트랜지스터(Q2)가 온이 되어 센터탭(CT)으로부터 트랜지스터(Q2)에 인가된 전류가 저항(R1,R2)을 통해 코일(L1)에 인가되어 접지로 흐르게 되는 것이다.In the present invention, the eliminating coil (L 1 ) is connected to ground, the center tap (CT) is connected to the emitter of the transistor (Q 2 ), and the resistor (R 1 ) and the capacitor (C) through the resistor (R 2 ) to the collector. 1 ), when transistor Q 1 is turned on, transistor Q 2 is turned on so that current applied to transistor Q 2 from center tap CT is passed through resistors R 1 and R 2 . It is applied to the coil (L 1 ) to flow to the ground.

이때, 콘덴서(C1)는 페라이드 헤드의 자계를 소자시키도록 진폭이 점차 0으로 감소하는 정현파를 소거헤드의 코일(L1)에 인가하는 기능을 한다.At this time, the condenser C 1 functions to apply a sinusoidal wave whose amplitude gradually decreases to zero so as to element the magnetic field of the feride head to the coil L 1 of the erase head.

두 번째 천이응답 특성을 이용하기 위해서 제 3 도에 도시된 바와같이 트랜지스터(Q1)가 오프되는 시점에서 진동하면서 감쇄되는 신호를 발생시킬 수 있다.In order to use the second transition response characteristic, as illustrated in FIG. 3, the attenuated signal may be generated while vibrating when the transistor Q 1 is turned off.

따라서, 소자가 완료된후 소거코일(L1)에 흐르는 전류가 언더 댐핑(Underdamping)되도록 하여 소거헤드에 남아있는 잔류자계를 제거한다.Therefore, after the device is completed, the current flowing in the erasing coil L 1 is underdamped to remove the residual magnetic field remaining in the erasing head.

소거코일(L1)에 흐르는 전류가 언더댐핑되기 위해서는 댐핑계수(α)가 공진주파수(WO)보다 작아야 한다.To become the current is flowing through the under-damped erase coil (L 1) and the damping coefficient (α) is smaller than the resonance frequency (W O).

이 된다.Becomes

그러므로 상기 식으로부터 주파수(Wn)와 소자코일(L1)의 값을 알면 콘덴서(C1)의 값을 계산할 수 있다.Therefore, the value of the capacitor C 1 can be calculated by knowing the value of the frequency Wn and the element coil L 1 from the above equation.

따라서, 소거코일(L1)에 흐르는 전류가 언더댐핑 되도록 즉, 댐핑계수(α)가 공진주파수(WO)보다 작은 값을 갖도록 콘덴서(C1)의 값을 정하면 소거가 완료된 후 제 3 도와 소거코일(L1)에 흐르는 전류가 언더 댐핑되어 소거코일(L1)에 발생된 전류자계를 소자시킬 수 있다.Therefore, if the value of the capacitor C 1 is determined such that the current flowing in the elimination coil L 1 is underdamped, that is, the damping coefficient α has a value smaller than the resonance frequency W O , the third degree after erasing is completed. the current flowing through the cancellation coils (L 1) is under-damping element can be a magnetic field generating current to the erase coil (L 1).

이때, 제 2 도에서 저항(R1)만을 사용하여도 소자가 가능하지만 트랜지스터(Q1)가 턴온될 때 오버댐핑시스템(Over damped system)이 되어야 하고, 턴 오프 될 때 언더 댐핑 시스템(Under Damped system)이 되어야 하기 때문에 저항(R1,R2)을 분리시키고 그 사이에 콘덴서(C1)를 연결한 것이다.At this time, the device can be used by using only the resistor R 1 in FIG. 2, but it must be an over damped system when the transistor Q 1 is turned on, and an under damped system when the transistor Q 1 is turned off. It is a system, so the resistors (R 1 , R 2 ) are separated and the capacitor (C 1 ) is connected between them.

따라서, 소거코일(L1)에 흐르는 전류는 저항(R1,R2)의 합에 의해 제한되며, 한 정상상태(Steady State)에서 다른 정상상태로 되기 위해서는 5개의 시정수가 필요하다.Therefore, the current flowing through the elimination coil L 1 is limited by the sum of the resistors R 1 and R 2 , and five time constants are required to become from one steady state to another.

또한, 소거코일은 서로 분리되어 권선되어야하고 센터 탭은 분리하지 말아야 하는데, 이는 소거코일을 통해 흐르는 전류가 전압 상승 또는 하강동안 콘덴서(C1)가 단락회로도 동작을 하여 트랜지스터(Q2)가 소스-볼테이지 스위칭(Source-Voltage Switching)역할을 하는데 있다.Also, the erasing coils must be separated from each other and the center taps must not be separated, since the capacitor C 1 operates as a short circuit while the current flowing through the erasing coil is rising or falling, so that the transistor Q 2 is sourced. It is in the role of Source-Voltage Switching.

상기 언급된 식(1)에 의한 계산은 어떤 성분의 영역을 규정짓기 위한 것으로 실제의 적절한 값은 측정데이터에 의해 정해져야 한다.The calculation by Equation (1) mentioned above is intended to define the area of a component and the actual appropriate value should be determined by measurement data.

본 고안은 소거 후 소거코일에 발생된 잔류자계를 제거하여 데이터 기입시 매개체가 소거헤드에 의한 영향을 받지 않도록 하므로써 재생시 독출데이타의 에러 발생을 방지하는 이점이 있다.The present invention eliminates the residual magnetic field generated in the erase coil after erasing, thereby preventing the media from being affected by the erase head when writing data, thereby preventing an error of read data during reproduction.

Claims (1)

트랜지스터(Q1)의 구동에 의해 센터링(CT)으로부터 전류가 소거코일(L1)에 인가되어 트랜지스터(Q1)를 통해 접지로 흘리므로써 소거코일(L1)에 전류가 흘러 기록된 신호를 소거시키는 플로피 디스크 드라이버의 소거회로에 있어서, 트랜지스터(Q2)의 콜렉터에 저항(R1, R2)과 콘덴서(C1)를 연결하여 트랜지스터(Q1)의 구동에 의해 트랜지스터(Q2)를 통해 센터탭(CT)으로부터 코일(L1)에 전류를 흘려 기록된 신호를 소거시킨 다음 트랜지스터(Q1) 오프시 콘덴서(Q1)의 값에 의해 언더댐핑되도록하므로써 소거코일(L1)의 잔류자계를 소자시키도록 구성되어지는 것을 특징으로하는 소자기능을 겸한 플로피디스크 드라이버의 소거회로.Transistor (Q 1) drives the centering (CT) the current erase coil (L 1) is the current in the erase coil (L 1) flows recording meurosseo through the transistor (Q 1) spilling into the ground to a signal from by the In the erasing circuit of the floppy disk driver for erasing, the transistors Q 2 are driven by driving the transistors Q 1 by connecting the resistors R 1 and R 2 and the capacitor C 1 to the collector of the transistor Q 2 . an erase by that the damping-under by the value of the center tap in which (CT) coil (L 1) erasing the flow recording signal current to from the following transistor (Q 1) off when the capacitor (Q 1) through the coil (L 1) And an erasing circuit of a floppy disk driver having a device function, characterized in that it is configured to element a residual magnetic field.
KR2019880012275U 1988-07-28 1988-07-28 Erasing circuit for floppy disc driver KR910005512Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880012275U KR910005512Y1 (en) 1988-07-28 1988-07-28 Erasing circuit for floppy disc driver

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Application Number Priority Date Filing Date Title
KR2019880012275U KR910005512Y1 (en) 1988-07-28 1988-07-28 Erasing circuit for floppy disc driver

Publications (2)

Publication Number Publication Date
KR900003700U KR900003700U (en) 1990-02-08
KR910005512Y1 true KR910005512Y1 (en) 1991-07-27

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