KR900000030Y1 - Control circuit for the tracking servo circuit - Google Patents
Control circuit for the tracking servo circuit Download PDFInfo
- Publication number
- KR900000030Y1 KR900000030Y1 KR2019860004903U KR860004903U KR900000030Y1 KR 900000030 Y1 KR900000030 Y1 KR 900000030Y1 KR 2019860004903 U KR2019860004903 U KR 2019860004903U KR 860004903 U KR860004903 U KR 860004903U KR 900000030 Y1 KR900000030 Y1 KR 900000030Y1
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- control
- signal
- servo circuit
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Classifications
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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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 회로도.1 is a conventional circuit diagram.
제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 마이콤 2 : 검출부1: microcomputer 2: detection unit
3 : 증폭부 4 : 위상보상부3: amplification section 4: phase compensation section
5 : 서보회로 6 : 콘트롤부5: Servo Circuit 6: Control Unit
CS : 콘트롤 신호 ○P1, OP2, OP3: OP앰프CS: Control Signal ○ P 1 , OP 2 , OP 3 : OP Amplifier
L1: 트랙킹코일 C1, C2, C3: 콘덴서L 1 : tracking coil C 1 , C 2 , C 3 : condenser
ZD : 제너 다이오드 VR1: 가변저항ZD: Zener Diode VR 1 : Variable Resistor
Q1, Q2, Q3: 트랜지스터 R1, R2, R3, R4: 저항Q 1 , Q 2 , Q 3 : Transistors R 1 , R 2 , R 3 , R 4 : Resistance
TS : 트랙킹 서보 제어신호TS: Tracking Servo Control Signal
본 고안은 컴팩트 디스크 플레이어(Conpact Disc-Player)의 광검출 장치인 픽업(Pick-up)의 이동을 제어하는 트랙킹 서보 회로의 콘트롤 회로에 관한 것이다.The present invention relates to a control circuit of a tracking servo circuit that controls the movement of a pick-up, which is a light detection device of a compact disc player.
콤팩트 디스크 플레이어에서 자동선곡시나 뮤직 서어치시 픽업이 디스크의 동심원상의 트랙을 추적하여 원하는 신호를 검출하고 있는 것으로 이와같은 정상적인 구동시에 층격이나 디스크의 홈에 의하여 에러 신호가 증가할때에는 픽업이 현재의 트랙을 그대로 추적할 수 있는 콘트롤 회호가 필요하게 되는 것이었다.In compact disc players, during automatic selection or music search, the pickup detects the desired signal by tracking the disc's concentric tracks.In this normal operation, when the error signal increases due to the stratification or the groove of the disc, the pickup is the current track. We needed a control call to keep track of.
따라서 종래에는 제1도와 같이 증폭부(3)와 서보회로(5)사이에 콘트롤부(6)를 구성시켜 트랙킹 홀드 신호(TRHD) 트랙킹 게인로우신호(TRGL), 트랙킹 차단신호(TROF), 포거스서치신호(FCS)등의 4개의 콘트롤 신호로서 다단의 트랜지스터(Q1-Q3)를 구동시켜 서보회로의 트랙킹 코일(L1)의 구동을 제어하도록 하였으나 콘트롤부(6)의 다단의 트랜지스터를 제어하기 위하여는 각각의 바이어스 전압을 정확히 분배하기 위한 복잡한 회로가 필요하게 되는 것이었다.Therefore, in the related art, the control unit 6 is formed between the amplifier 3 and the servo circuit 5 as shown in FIG. 1, so that the tracking hold signal TRHD, the tracking gain low signal TRGL, the tracking cutoff signal TROP, The multi-stage transistors of the control unit 6 are controlled to drive the tracking coil L 1 of the servo circuit by driving the multi-stage transistors Q 1 -Q 3 as four control signals such as the Gus search signal FCS. In order to control the voltage, a complicated circuit for accurately distributing each bias voltage is needed.
본 고안은 이와 같은 점을 감안하여 단순화된 콘트롤부를 제어하여 대량 생산시 크게 제조원가를 낮출수 있는 동시에 신뢰성을 높일수 있는 트랙킹 서보 회로의 콘트롤 회로를 제공하고자 하는 것으로 증폭부와 서보회로 사이에 위상 보상부를 구성시키고 콘트롤 신호가 인가되는 마이콤의 출력단자에 제너다이오드를 통하여 트랜지스터가 제어되게 콘트롤부를 구성시킨 것이다.The present invention is to provide a control circuit of a tracking servo circuit that can reduce the manufacturing cost and increase the reliability at the time of mass production by controlling the simplified control unit. The control unit is configured to control the transistor through the zener diode at the output terminal of the microcomputer to which the control signal is applied.
이를 제2도에 의하여 상세히 설명하면 다음과 같다.This will be described in detail with reference to FIG. 2 as follows.
본 고안은 에러신호(E) (F)가 인가되는 검출부(2)에서 OP앰프 (OP1)의 궤환 신호가 저항(R1) 콘덴서(C1)를 통하여 반전단자(-)에 인가되게 구성키고 가변저항(VR1)을 통하여 OP앰프 (OP2) 및 저항(R2-R4) 및 콘덴서(C2)(C3)로 구성된 증폭부(3)에서 저항(R5-R7) 및 콘덴서(C4)로 구성된 위상 보상부(4)에 인가되게 구성시킨다.The present invention is configured such that the feedback signal of the OP amplifier (OP 1 ) is applied to the inverting terminal (-) through the resistor (R 1 ) condenser (C 1 ) in the detector (2) to which the error signal (E) (F) is applied. In the amplifying section 3 consisting of an OP amplifier (OP 2 ) and resistors (R 2 -R 4 ) and capacitors (C 2 ) (C 3 ) through the variable resistor (VR 1 ), the resistors (R 5 -R 7 ) And a phase compensator 4 composed of a capacitor C 4 .
그리고 저항(R5)(R6) 사이에 트랜지스터(Q1)의 콜렉터측을 연결시킨후 콘트롤 신호(CS)가 인가되는 마이콤(1)의 트랙킹 서보 제어신호(TS)가 제너다이오드(ZD)를 통하여 트랜지스터(Q1)의 베이스측에 인가되게 콘트롤부(6)를 시키고 출력단에 OP앰프(OP3) 및 트랙킹코일(L1)로 구성된 서보회로(5)에 인가되게 구성시킨 것이다.After connecting the collector side of the transistor Q 1 between the resistors R 5 and R 6 , the tracking servo control signal TS of the microcomputer 1 to which the control signal CS is applied is the zener diode ZD. The control unit 6 is applied to the base side of the transistor Q 1 through and is applied to the servo circuit 5 composed of the OP amplifier OP 3 and the tracking coil L 1 at the output terminal.
이와같이 구성된 본 고안에서 광발생장치(픽업)를 통하여 인식된 트랙킹(tracking) 광출력(E)(F)이 전류상태로 변하여 검출부(2)의 OP앰프 (OP1)에 각각 인가되면 OP앰프(OP1)를 통하여 비교된 트랙킹 에러신호가 출력되는 것으로 이상태 신호가「0」일때에 트랙킹이 정확히 맞아있는때가 된다. (트랙킹 코일 L1에 전류를 공급하지 않음)In the present invention configured as described above, when the tracking light output E (F) recognized through the light generating device (pickup) is changed to a current state and applied to the OP amplifier OP 1 of the detection unit 2, the OP amplifier ( The tracking error signal compared through OP 1 ) is outputted, which is when the tracking is correct when this status signal is "0". (No current is supplied to the tracking coil L 1 )
반대로 트랙킹 에러 신호가 클때에는 트랙킹이 많이 어긋난때가 되고 음수값을 같게될때 반대방향으르 트랙킹이 어긋나 있을때이므로 트랙킹 코일(L1)에 전류를 보내어 픽업이 정확하게 트랙을 추적할 수 있도록 하여야 한다.On the contrary, when the tracking error signal is large, the tracking is shifted a lot, and when the negative value is the same, the tracking is shifted in the opposite direction. Therefore, a current must be sent to the tracking coil L 1 so that the pickup can accurately track the track.
즉, 검출부(2)의 출력은 가변저항(VR1)을 통하여 증폭부(3)의 OP앰프(OP2)의 비반전단자(+)에 인가되어 증폭된 후 위상보상부(4)에 인가되게 된다.That is, the output of the detector 2 is applied to the non-inverting terminal (+) of the OP amplifier OP 2 of the amplifier 3 through the variable resistor VR 1 and amplified and then applied to the phase compensator 4. Will be.
여기 출력이 OP앰프(OP2)의 반전단자(-)로 궤환될때에 저항(R2-R4) 및 콘덴서(C2)(C3)를 구성시킨 것은 출력을 인정화시키기 위한 것이다.When the excitation output is fed back to the inverting terminal (-) of the OP amplifier OP 2 , the resistors R 2 -R 4 and the capacitors C 2 and C 3 are configured to acknowledge the output.
그리고 위상보상부(4)의 저항(R5-R7) 및 콘덴서(C4)로 중역 및 저역을 보상(증가)시켜 서보회로(5)의 OP앰프(OP3)에서 증폭된 트랙킹 코일(L1)에 전류를 인가시켜 픽업이 이동되게 함으로써 원하는 트랙을 추적할수 있게 된다.The tracking coils amplified by the OP amplifier OP 3 of the servo circuit 5 by compensating (increasing) the mid and low ranges with the resistors R 5 -R 7 and the capacitor C 4 of the phase compensator 4 . By applying current to L 1 ), the pickup can be moved to track the desired track.
이와같이 서보회로(5)가 정상적으로 동작중에 콤팩트 디스크 플레이어에 충격이 가하지거나 디스크의 트랙이 홈에 의하여 파손될때에는 저주파 신호가 급속히 증가하여 트랙킹 에러 신호가 증가됨되므로 콘트롤부(6)에서 픽업이 오동작을 하는 것을 방지하게 되는 것으로 마이콤(1)에 인가되는 트랙킹홀드신호(TRHD), 트랙킹게인로우신호(TRGL), 트랙킹 오프신호(TROF)포커스 서치신호(FCS)등의 4개의 콘트롤 신호(CS)에 의하여 소프트 웨어적으로 판단하여 트랙킹 서보제어신호(T, S)가 출력되어 일정기간 이상 제너다이오드(ZD)를 통하여 정전원으로 트랜지스터(Q1)를 도통시키게 되므로 서보회로(5)에 인가되는 입력을 차단할 수가 있어 트랙킹 코일(L1)에 전류를 못흐르게 함으로서 현재의 추적중인 트랙을 그대로 유지한채 픽업이 디스크의 정보신호를 감지하게 되는 것이다.Thus, when the servo circuit 5 is normally operated, when the compact disc player is not impacted or the track of the disc is damaged by the groove, the low frequency signal is rapidly increased and the tracking error signal is increased. The control signal CS, such as the tracking hold signal TRHD, the tracking gain low signal TRGL, the tracking off signal TROP, the focus search signal FCS, and the like, which are applied to the microcomputer 1, are prevented. The tracking servo control signals (T, S) are output by judging by software, and the transistor (Q 1 ) is conducted to the electrostatic source through the zener diode (ZD) for a predetermined period of time, so that the input applied to the servo circuit (5) is reduced. you can not block the current flowing to the tracking coil (L 1) by keeping the current track being the track of one pickup to detect an information signal on the disk It will be good.
또한 자동선곡 기능시 임의의 트랙을 선택하는 동안의 픽업(광검출장치)이 현재의 트랙을 그대로 추적할 수 있도록 하여야 하는 것으로 본 고안에서는 마이콤(1)의 트랙킹 서보제어신호(TS)로서 콘트롤부(6)의 트랜지스터(Q1)를 도통시켜 상기와 같이 트랙킹 코일(L1)이 구동되지 않도록 하여 픽업이 정상적으로 트랙을 추적할수가 있게 되는 것이다.In addition, the pickup (photodetector) while selecting an arbitrary track in the automatic selection function should be able to track the current track as it is. In the present invention, the control unit is used as a tracking servo control signal (TS) of the microcomputer 1. The transistor Q 1 of (6) is turned on so that the tracking coil L 1 is not driven as described above, so that the pickup can track the track normally.
이상에서와 같이 본 고안은 여러가지 제어신호인 콘트롤신호(CS)소프트 웨어적으로 제어하여 충격시나 디스크의 저주파홈의 에러신호 증가시 픽업의 이동을 차단시킬수 있으며 자동선곡기능 동작시 증가시 픽업의 이동을 차단시킬수 있으며 자동선곡 기능 동작시 자동선곡 여부를 판단하여 트래킹 에러신호의 구동을 방지할 수가 있으므로 하드워적으로 복잡하게 구성시킨 회로보다 단순화를 기할수가 있는 효과가 있어 대량 생산시 제조원가를 크게 낮출수 있는 동시에 하드웨어적인 구성보다 신뢰성을 크게 향상시킬수 있는 이점이 있는 것이다As described above, the present invention can be controlled by control signal (CS) software, which is various control signals, to block the movement of the pickup in the event of an impact or an error signal of the low frequency groove of the disc. It is possible to block the tracking error signal by judging whether it is automatic selection when the automatic selection function is operated, and thus it is possible to simplify the circuit compared with a complicated circuit, which greatly reduces the manufacturing cost in mass production. At the same time, there is an advantage that the reliability can be greatly improved over the hardware configuration.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860004903U KR900000030Y1 (en) | 1986-04-12 | 1986-04-12 | Control circuit for the tracking servo circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860004903U KR900000030Y1 (en) | 1986-04-12 | 1986-04-12 | Control circuit for the tracking servo circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870017167U KR870017167U (en) | 1987-11-30 |
| KR900000030Y1 true KR900000030Y1 (en) | 1990-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860004903U KR900000030Y1 (en) | 1986-04-12 | 1986-04-12 | Control circuit for the tracking servo circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR900000030Y1 (en) |
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1986
- 1986-04-12 KR KR2019860004903U patent/KR900000030Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR870017167U (en) | 1987-11-30 |
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