KR910008993Y1 - Shock compensation circuit for compact disc player - Google Patents

Shock compensation circuit for compact disc player Download PDF

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Publication number
KR910008993Y1
KR910008993Y1 KR2019860004402U KR860004402U KR910008993Y1 KR 910008993 Y1 KR910008993 Y1 KR 910008993Y1 KR 2019860004402 U KR2019860004402 U KR 2019860004402U KR 860004402 U KR860004402 U KR 860004402U KR 910008993 Y1 KR910008993 Y1 KR 910008993Y1
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South Korea
Prior art keywords
vibration
amplifier
compact disc
disc player
sensor
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KR2019860004402U
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Korean (ko)
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KR870017166U (en
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안일성
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삼성전자주식회사
한형수
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Priority to KR2019860004402U priority Critical patent/KR910008993Y1/en
Publication of KR870017166U publication Critical patent/KR870017166U/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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59627—Aligning for runout, eccentricity or offset compensation
    • 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
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1825—Driving of both record carrier and head driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helicoïdal scanning
    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59605—Circuits

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  • Optical Recording Or Reproduction (AREA)

Abstract

내용 없음.No content.

Description

콤팩트 디스크 플레이어의 충격시 보상회로Compensation circuit in impact of compact disc player

제1도는 종래의 서보 회로도.1 is a conventional servo circuit diagram.

제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.

제3도는 본 고안 회로도의 각부 파형도.3 is a waveform diagram of each part of the circuit diagram of the present invention.

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

5 : 미분회로 10 : 서보회로5: Differential Circuit 10: Servo Circuit

15 : 진동 검출부 20 : 반전 증폭부15: vibration detection unit 20: inverting amplifier unit

25 : 비교부 L1 : 트랙킹 코일25: comparison unit L1: tracking coil

OP1, OP2, OP3, CP4 : OP 앰프 M : 영구자석OP1, OP2, OP3, CP4: OP Amplifier M: Permanent Magnet

S : 센서 Q1-Q3 : 트랜지스터S: Sensor Q1-Q3: Transistor

R1, R2, R3 : 저항 C1, C2, C3 : 콘덴서R1, R2, R3: Resistor C1, C2, C3: Capacitor

본 고안은 콤팩트 디스크 플레이어(COMPACT DISC PLAYER)의 충격시 보상회로에 관한 것이다.The present invention relates to a compensation circuit in the impact of a compact disc player (COMPACT DISC PLAYER).

콤팩트 디스크 플레이어는 전자 비임을 이용하여 디스크의 트랙에 기록되어진 디지탈 데이타를 비접촉 방식으로 픽업하는 것으로 전자비임이 트랙을 정확히 추적하여야 하나 외부 충격등이 가해질 경우 트랙을 벗어나게 된다.A compact disc player uses an electronic beam to pick up digital data recorded on a track of a disc in a non-contact manner. The electronic beam must accurately track the track, but it will be out of the track when an external impact light is applied.

이같이 전자비임 트랙을 벗어났을 경우 서보(SERVO)의 트랙킹 이득을 증가시키게 되면 정상적인 트랙을 추적할 수 있게 되나 항상 트랙킹 이득을 높여줄 경우에는 먼지등에 의한 에러에서 불합리하게 되므로 외부 충격시에만 트랙킹 이득을 높여 주어야 하는 것이다.In this way, if you increase the tracking gain of Servo when you move out of the electronic beam track, you can track the normal track, but if you increase the tracking gain all the time, it will be unreasonable from errors caused by dust. It must be elevated.

본 고안은 이와같은 점을 감안하여 외부 충격시 이를 검출하여 서보회로의 트랙킹 이득을 높여 주므로써 오부충격에 의해 트랙을 벗어나는 현상을 보상해 주도록한 것으로 콤팩트 디스크 플레이어의 진동부위와 고정부위에 각각 대향된 위치로 영구자석과 센서를 내장시켜 진동 검출부를 구성하고 상기 진동검출부의 출력을 반전증폭부에서 반전증폭시킨후 미분시키게 미분회로를 구성하며 상기 미분회로의 미분 출력을 비교부에서 기준전압과 비교시킨 값으로 통상의 서보회로 이득을 제어하게 트랜지스터를 구성시킨 것이다.In consideration of this, the present invention detects this in the event of external impact and raises the tracking gain of the servo circuit, thereby compensating for the deviation from the track due to the false impact. It opposes the vibration part and the fixed part of the compact disc player, respectively. A permanent magnet and a sensor are built into the vibration detector, and a differential circuit is configured to invert and then invert the output of the vibration detector in an inverting amplifier. The differential output of the differential circuit is compared with a reference voltage in the comparator. The transistor is constituted so as to control the normal servo circuit gain at this value.

이를 첨부 도면에 의하여 상세히 설명하면 다음과 같다.This will be described in detail with reference to the accompanying drawings.

제1도는 종래의 서보 회로도로써 저항(R1-R4) 및 콘덴서(C2), (C3)를 OP앰프(OP1)와 연결 구성시켜 반전 증폭기를 구성한 것으로 일측단자(+)는 접지시키고 저항(R2), (R3)에 병렬로 콘텐서(C2), (C3)를 구성시켜 위상을 보상하게 구성시킨 후 출력 트랜지스터(Q1), (Q2)를 통하여 트랙킹 코일(L1)를 제어하게 통상의 서보회로(10)를 구성한 것으로 트랙킹 코일(L1)에 흐르는 전류에 의하여 비임의 트랙킹이 조절되게 된다.FIG. 1 is a conventional servo circuit diagram in which an inverting amplifier is formed by connecting resistors R1-R4, capacitors C2, and C3 with an OP amplifier OP1. The one terminal (+) is grounded and the resistor (R2) And compensating the phases by configuring the capacitors C2 and C3 in parallel to R3, and then controlling the tracking coil L1 through the output transistors Q1 and Q2. 10), the tracking of the beam is controlled by the current flowing through the tracking coil L1.

제2도는 본 고안의 회로도로써 콤팩트 디스크 플레이어의 진동부위와 고정부위의 대향된 위치에 영구자석(M)과 센서(S)를 설치하여 진동을 검출하는 진동 검출부(15)와, 상기 진동검출부(15)의 검출 출력을 OP 앰프(OP2)에서 반전 증폭기키는 반전증폭부(20)와, 상기 반전 증폭부(20)의 출력을 미분시키는 미분회로(5)와, 상기 미분회로(5)의 미분파형을 OP앰프(OP3), (OP3)에서 저항(R11-R14)에 의한 기준전압(REF)-(REF)과 비교하는 비교부(25)와, 상기 비교부(25)의 비교출력은 콘덴서(C19)에서 적분시킨 값으로 동작되고, 공지의 서보 회로(10)이득을 증가시키는 트랜지스터(Q3)로 구성된 것이다.2 is a circuit diagram of the present invention, the vibration detection unit 15 for detecting vibration by installing a permanent magnet (M) and the sensor (S) in the opposite position of the vibration portion and the fixed portion of the compact disc player, and the vibration detection unit ( The inverting amplifier key is connected to the inverting amplifier section 20, the differential circuit 5 for differentiating the output of the inverting amplifier section 20, and the differential circuit 5 of the inverting amplifier key from the OP amplifier OP2. The comparison unit 25 that compares the differential waveform with the reference voltages REF- (REF) by the resistors R11-R14 at the OP amplifiers OP3 and OP3, and the comparison output of the comparison unit 25 It is composed of a transistor Q3 that operates at the value integrated in the capacitor C19 and increases the gain of the known servo circuit 10.

이와같이 구성된 본 고안의 작용 효과를 설명한다.The effect of the present invention configured as described above will be described.

먼저 진동 검출부(15)의 영구자석(M)은 콤팩트 디스크 플레이어의 진동부위(디스크의 회전을 위하여 회전하는 부위)에 설치하고 센서(S)는 상기 영구자석(M)과 대향된 위치의 고정부위에 설치하므로써 평상시 영구자석(M)과 센서(S)는 상기 일정거리를 유지하게 되나 외부 충격이 가해지게 되면 영구자석(M)이 설치된 진동부위에 충격이 가해지게 되므로써 영구자석(M)과 센서(S)의 거리는 변하게 된다.First, the permanent magnet M of the vibration detecting unit 15 is installed on the vibration part of the compact disc player (the part which rotates for the rotation of the disc), and the sensor S is the fixed part of the position opposite to the permanent magnet M. Permanent magnet (M) and the sensor (S) is normally maintained by the predetermined distance by being installed on the outside of the permanent magnet (M) and the sensor because the shock is applied to the vibration portion is installed permanent magnet (M) when an external impact is applied The distance of S changes.

그리고 영구자석(M)과 센서(S)와의 거리에 따라 영구자석(M)의 자석이 센서(S)에 미치는 크기가 달라지게되므로 센서(S)에서는 상기 영구자석(M)의 자속에 따라 기전력을 유지시키게 된다.Since the size of the magnet of the permanent magnet (M) affects the sensor (S) according to the distance between the permanent magnet (M) and the sensor (S), the electromotive force in the sensor (S) according to the magnetic flux of the permanent magnet (M) Will be maintained.

따라서 충격이 가해지지 않은 상태에서는 진동 부위가 일정한 회전을 하게 되어 영구자석(M)과 센서(S)의 거리가 일정하게 되므로 영구자석(M)의 회전에 따라 센서(S)에서 일정 주기의 기전력을 발생시키게 되나 외부충격이 가해지면 진동부위가 진동하여 영구자석(M)과 센서(S)와의 거리가 충격에 따라 가까워지게 되므로 이때에는 센서(S)에서 발생시킨 기전력의 기울기가 정상시에 비하여 급하게 된다.Therefore, in the state where no impact is applied, the vibration part rotates at a constant distance, so that the distance between the permanent magnet M and the sensor S is constant, so that the electromotive force of a certain period in the sensor S is changed according to the rotation of the permanent magnet M. When the external shock is applied, the vibration part vibrates and the distance between the permanent magnet (M) and the sensor (S) becomes closer to the shock. At this time, the slope of the electromotive force generated by the sensor (S) is lower than normal. You are in a hurry.

즉 외부충격이 가해지지 않았을 경우 영구지석(M)과 센서(S)의 거리가 일정하게 되어 센서(S)의 기전력을 제3a도에서 AA로 도시된 기울기를 갖게 되나 충격이 가해졌을 경우에는 영구자석(M)과 센서(S)와의 거리가 변화하게 되어 제3a도에서 BB로 도시된 기울기를 갖게 된다.That is, when no external shock is applied, the distance between the permanent grindstone M and the sensor S becomes constant, so that the electromotive force of the sensor S has the slope shown by AA in FIG. 3a, but is permanent when the impact is applied. The distance between the magnet M and the sensor S is changed to have a slope shown by BB in FIG. 3a.

이같이 외부 충격에 의하여 변화되는 기울기를 갖게 되는 진동검출부(15)의 출력은 반전 증폭부(20)의 OP앰프(OP2)의 반전단자(-)에 인가되어 반전 증폭되게 되며 상기 OP 앰프(OP2)를 통하여 반전 증폭된 파형은 미분회로(5)의 콘덴서(C8)와 저항(R8)에 의해 미분되어 제2b도와 같은 파형이 된다.As such, the output of the vibration detector 15 having the inclination changed by an external impact is applied to the inverting terminal (-) of the OP amplifier OP2 of the inverting amplifier 20 to be inverted and amplified and the OP amplifier OP2. The waveform inverted and amplified through is differentiated by the capacitor C8 and the resistor R8 of the differential circuit 5 to form a waveform as shown in FIG. 2B.

그리고 상기 미분회로(5)의 미분 파형은 OP 앰프(OP3)의 반전단자(-)와 OP 앰프(OP4)의 비반전단자(+)에 인가되게 되며 이때 OP 앰프(OP3)의 비반전단자(+)에는 저항(R13), (R14)에 의해 설정된 기준전압(-REF)이 인가되게 되고 OP 앰프(OP4)의 반전단자(-)에는 저항(R11), (R12)에 의해 설정된 기준전압(REF)이 인가되어 있게 된다. (제3c도 참조)The differential waveform of the differential circuit 5 is applied to the inverting terminal (-) of the OP amplifier OP3 and the non-inverting terminal (+) of the OP amplifier OP4, and at this time, the non-inverting terminal of the OP amplifier OP3 The reference voltage (-REF) set by the resistors R13 and R14 is applied to +, and the reference voltage set by the resistors R11 and R12 is applied to the inverting terminal (-) of the OP amplifier OP4. REF) is applied. (See also 3c)

이때 기준전압(REF), (-REF)는 외부 충격이 가해지지 않았을 경우 진동 검출부(15)에서 검출되어 미분회로(5)에서 미분된 미분 파형보다 높게 설정해 주므로써 평상시에는 OP 앰프(OP3), (OP4)의 출력이 모두 로우레벨이 되게 하고 외부 충격이 가해져 미분회로(5)의 마분 파형 전압이 기준 전압(REF), (-REF)로다 높아지게 되는 경우에만 OP 앰프(OP3), (OP4)중 한곳에서 하이레벨 펄스를 출력시키게 된다.At this time, when the external voltage is not applied, the reference voltages REF and (-REF) are detected by the vibration detector 15 and set higher than the differential waveform differentiated in the differential circuit 5, so that the OP amplifier OP3, OP amplifiers (OP3) and (OP4) only when the outputs of (OP4) are all low level and external shock is applied so that the differential waveform voltage of the differential circuit 5 becomes higher than the reference voltages (REF) and (-REF). One of them will output a high level pulse.

따라서 OP 앰프(OP3), (OP4)의 출력측으로는 평상시 제3d도에서와 같이 로우레벨을 출력시키게 되고 외부 출력이 가해졌을 경우에는 구형파 펄스를 출력시키게 된다.Therefore, the output side of the OP amplifiers OP3 and OP4 normally outputs a low level as shown in FIG. 3d, and outputs a square wave pulse when an external output is applied.

그리고 OP 앰프(OP3), (OP4)의 출력은 콘덴서(C19)에 의해 제3e도에서와 같이 적분된후 트랜지스터(Q3)의 베이스에 인가되므로써 트랜지스터(Q3)의 평상시 '턴온'된 상태에 있다가 제3f도와 같은 구간(외부 충격시 가해졌을때)'턴오프'되게 된다.The outputs of the OP amplifiers OP3 and OP4 are normally 'turned on' of the transistor Q3 by being integrated by the capacitor C19 as shown in FIG. 3E and then applied to the base of the transistor Q3. Is 'turned off' in the same section as 3f (when applied during external impact).

즉 트랜지스터(Q3)는 외부 충격이 가해지지 않은 평상시에는 '턴온'상태를 유지하게 되고 외부 충격이 가해지게 되면 '턴오프'상태를 유지하게 되는 것이다.In other words, the transistor Q3 is maintained in a 'turn on' state when no external shock is applied, and is maintained in a 'turn off' state when an external shock is applied.

그리고 트랜지스터(Q3)가 '턴온'되면 저항(R20)이 병렬 연결되나 트랜지스터(Q3)가 '턴온프'되면 오픈되게 되므로 트랜지스터(Q3)의 '턴오프'시(외부 충격시)에 에러 신호가 더 크게 공지의 서보 회로(10)에 인가되게 되므로써 서보 회로(10)의 트랙킹 이득을 증가시킴으로써 외부 충격시 전자 비임이 트랙을 벗어나지 않고 정확히 추적할 수 있는 것이다.When the transistor Q3 is 'turned on', the resistor R20 is connected in parallel, but when the transistor Q3 is 'turned on', the resistor is opened. Therefore, an error signal is generated when the transistor Q3 is turned off (external shock). By increasing the tracking gain of the servo circuit 10 by being applied to a more known servo circuit 10, the electron beam can be accurately tracked without leaving the track during an external impact.

이상에서와 같이 본 고안은 외부 충격을 검출하여 외부 충격시 통상의 서보 회로에 대한 트랙킹 이득을 높여 주므로써 외부 충격시에도 비임이 제 트랙을 정확히 추적할 수 있어 트랙 점프 현상의 발생을 방지할 수 있게 된다.As described above, the present invention detects an external shock and increases the tracking gain for a normal servo circuit during an external shock, so that the beam can accurately track the track even during an external shock, thereby preventing the occurrence of a track jump phenomenon. Will be.

Claims (1)

서보 회로(10)가 구성된 콤팩트 디스크 플레이어에 있어서, 진동부위와 고정부위의 대향된 위치에 영구자석(M)과 센서(S)를 설치하여 진동을 검출하는 진동 검출부(15)와, 상기 진동 검출부(15)의 검출 출력을 OP앰프(OP2)에서 반전 증폭시키는 반전 증폭부(20)와 반전 증폭부(20)와, 상기 반전 증폭부(20)의 출력을 미분시키는 미분회로(5)와, 상기 미분회로(5)의 미분 파형을 저항(R11-R14)에 의한 기준전압(REF), (-REF)과 OP앰프(OP3), (OP4)에서 비교하는 비교부(25)와, 상기 비교부(25)의 비교출력을 콘덴서(C19)에서 적분시킨 값으로 구동되고 서보 회로(10)의 이들을 제어하는 트랜지스터(Q3)를 구비시켜 된 것을 특징으로 하는 콤팩트 디스크 플레이어의 충격시 보상회로.In the compact disc player configured with the servo circuit 10, a vibration detector 15 for detecting a vibration by providing a permanent magnet M and a sensor S at opposite positions between the vibration part and the fixed part, and the vibration detection part; An inverting amplifier 20 and an inverting amplifier 20 for inverting and amplifying the detection output of the 15 in the OP amplifier OP2, a differential circuit 5 for differentiating the output of the inverting amplifier 20, A comparison unit 25 for comparing the differential waveform of the differential circuit 5 with the reference voltages REF, -REF by the resistors R11-R14 and the OP amplifiers OP3, OP4, and the comparison And a transistor (Q3) for driving the comparison output of the unit (25) to a value obtained by integrating the capacitor (C19) and controlling them in the servo circuit (10).
KR2019860004402U 1986-04-04 1986-04-04 Shock compensation circuit for compact disc player KR910008993Y1 (en)

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