KR880002689Y1 - Tracking servo switch control circuit - Google Patents
Tracking servo switch control circuit Download PDFInfo
- Publication number
- KR880002689Y1 KR880002689Y1 KR2019850004129U KR850004129U KR880002689Y1 KR 880002689 Y1 KR880002689 Y1 KR 880002689Y1 KR 2019850004129 U KR2019850004129 U KR 2019850004129U KR 850004129 U KR850004129 U KR 850004129U KR 880002689 Y1 KR880002689 Y1 KR 880002689Y1
- Authority
- KR
- South Korea
- Prior art keywords
- tracking
- tracking servo
- multivibrator
- output
- control circuit
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam 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 only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 본 고안의 블럭 구성도.1 is a block diagram of the present invention.
제 2 도는 본 고안의 각부에 나타나는 신호의 파형도.2 is a waveform diagram of a signal appearing in each part of the present invention.
제 3 도는 종래의 장치에서 각부에 나타나는 신호의 파형도.3 is a waveform diagram of signals appearing in various parts of a conventional apparatus.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
20 : 제로 레벨 검출기 30 : 재트리거 멀티바이브레이터20: zero level detector 30: retrigger multivibrator
EX : 익스클ㅜ시브 오어게이트Ex
본 고안의 광학식 디스크 재생장치에 있어서, 원활할 스캔(Scan) 동작을 행할 수 있도록 트랙킹 서어보스위치를 제어하기 위한 회로에 관한 것이다.The optical disc reproducing apparatus of the present invention relates to a circuit for controlling a tracking servo switch so as to perform a smooth scan operation.
종래에는 제 1 도에서 트리거 입력 멀티바이브레이터의 출력신호를 직접 오어게이트의 입력단에 가해주므로서 스캔 동작이 진행될 때 트리거 입력 멀티바이브레이터의 출력 파형이 오어게이트에 직접 가해지게 되어 오어게이트의 출력은 변하지 않은 상태 그대로 나타나게 된다. 따라서 트리거 입력 멀티바이브레이터의 출력 파형에서 Tm시간 슬립될때 트랙킹 서어보는 Tm주기 만큼 오프되게 된다.Conventionally, in Fig. 1, since the output signal of the trigger input multivibrator is directly applied to the input terminal of the orgate, the output waveform of the trigger input multivibrator is applied directly to the orgate when the scan operation is performed, so that the output of the orgate is not changed. It will appear as it is. Therefore, when the Tm time slips on the output waveform of the trigger input multivibrator, the tracking servo is turned off by the Tm period.
즉, 미러(Mirror)의 슬립주기(Tm)동안 슬립될때 미러의 관성에 의한 힘에 의하여 슬립주기(Tm)후에도 큰 트랙킹 에러가 제 3 도에 도시한 바와 같이 출력 되므로서, 트랙킹 서어보는 매우 불안정한 특성을 가지게 되었었다.That is, when slipping during the slip period Tm of the mirror, a large tracking error is output even after the slip period Tm by the force of the mirror inertia, as shown in FIG. Had the character.
본 고안은 이러한 점을 감안하여 트랙킹 에러가 없는 부분에서 트랙킹 서어보를 함에 따라 미러 슬립시에 발생하는 관성에 의한 힘을 재동시켜 주므로서, 계속 진행되는 트랙킹 서어보를 보다 원활하게 하도록 안출한 것으로, 이를 첨부한 도면에 의하여 상세히 설명하면 다음과 같다.In view of this, the present invention devised to make the tracking servo more smoothly by reactivating the force caused by the inertia generated during the mirror slip by tracking tracking in the absence of tracking error. When described in detail with the accompanying drawings as follows.
제 1 도에 도시한 바와 같이 앰프 및 보상회로(10)에 트랙킹 서어보 스위치(S1), 드라이브회로, 트랙킹 미러단의 스위치(S2), 트리거 입력멀티바이브레이터(50) 및 트랙킹 스위치 콘트롤부(40)를 각각 연결하여 구성된 공지의 트랙킹 서어보 제어회로에 있어서, 트랙킹 에러신호 입력단의 접속점(a)에 트랙킹 에러신호의 제로 레벨을 검출하는 제로 레벨 검출기(20)의 통하여 스캔의 진행 방향에 따라 제로 레벨 검출기(20)의 출력신호를 조절하여 주는 익스클루시브 오어게이트(EX)를 접속하고, 상기 익스클루시브 오어게이트(EX)의 출력단(d)에는 클리어단자(CLR)각 상기 트리거 입력 멀티바이브레이트(50)의 출력단(C)에 접속되고, 또한 출력단(e)은 오어게이트(OR1)의 타측입력단자에 접속된 재트리거 멀티바이브레이터(30)를 접속하여 구성한다.As shown in FIG. 1, the tracking servo switch S 1 , the drive circuit, the switching mirror stage switch S 2 , the trigger input multivibrator 50 and the tracking switch control unit are provided in the amplifier and compensation circuit 10. In the known tracking servo control circuit constructed by connecting 40 to each other, in the traveling direction of the scan through the zero level detector 20 for detecting the zero level of the tracking error signal at the connection point a of the tracking error signal input terminal. Accordingly, an exclusive or gate EX for adjusting an output signal of the zero level detector 20 is connected, and a clear terminal CLR is input to the output terminal d of the exclusive or gate EX. The output terminal e is connected to the output terminal C of the multivibration 50, and the output terminal e is configured by connecting a retrigger multivibrator 30 connected to the other input terminal of the or gate OR 1 .
미설명 부호 RX는 저항이고, CX는 콘덴서이며, B+는 직류 전원단자이다.Reference symbol R X is a resistor, C X is a capacitor, and B + is a DC power supply terminal.
이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다. 광학식 디시크 장치의 트랙킹 에러신호가 앰프 및 보상회로(10), 트랙킹 서어보스위치(S1), 및 드라이브회로를 통하여 트랙킹 미러로 입력되는 트랙킹 서어보 회로에서, 신호를 읽어 내는 픽업(Pick UP) 장치를 빠른 속도로 진행시키어 기록된 신호를 읽어 내고자할 경우에, 트랙킹 미러(도시 생략됨)에 가해지는 전압이 제 2 도에 도시한 b점 파형과 같이 급격히 증가하여, 트리거 입력 멀티바이브레이터(50)의 트리거 입력레벨(H 로 표시함)에 이르게 되면, 트리거 입력 멀티바이브레이터(50)를 트리거 시키게 되므로, C점 파형이 출력된다.Referring to the effect of the present invention configured as described above are as follows. Pick-up that reads out signals from the tracking servo circuit where the tracking error signal of the optical disc device is input to the tracking mirror through the amplifier and compensation circuit 10, the tracking servo switch S 1 , and the drive circuit. In the case where the device is to be operated at high speed and the recorded signal is read out, the voltage applied to the tracking mirror (not shown) increases sharply as shown by the b point waveform shown in FIG. When it reaches the trigger input level (denoted by H) of 50), the trigger input multivibrator 50 is triggered, so that a C point waveform is output.
이때 C점에 나타난 펄스의 펄스주기(Tm)는 트리거 입력 멀티바이브레이터(50)의 저항 및 콘덴서(도시 안됨)에 의한 시정수 값으로 정해진다.At this time, the pulse period (Tm) of the pulse shown at point C is determined by the time constant value by the resistance of the trigger input multivibrator 50 and a capacitor (not shown).
상기한 바와 같은 C점 파형에 의하여 트랙킹 미러단의 스위치(S2)가 온 상태로 되어 b점 파형에서와 같이 슬립 주기 (Tm) 동안에는 미러에 가해지는 전위를 접지 시키게 되므로 미러는 원상태로 복원되며, 이때 트랙킹 에러는 a점 파형으로 출력된다.Since the switch S 2 of the tracking mirror stage is turned on by the C point waveform as described above, the potential applied to the mirror is grounded during the sleep period Tm as in the b point waveform, so that the mirror is restored to its original state. At this time, the tracking error is output as a point waveform.
이와 같은 a점 파형을 제로 레벨 검출기(20)에서는 제로(0)레벨보다 큰 부분이 하이(H)가 되도록 검출하고, 이때 검출된 레벨의 신호와 스캔의 진행 방향에 따른 레벨을 조정하여 익스클루시브 오어게이트(EX)에 가해주므로, 그의 출력단에는 제 2 도의 d점 파형이 출력된다.Such a point waveform is detected by the zero level detector 20 such that a portion larger than the zero level becomes high (H). Since it applies to the sheave or gate EX, the d point waveform of FIG. 2 is output to the output terminal.
이와 같은 d점 파형이 재트리거 멀티바이브레이터(30)에 입력되며, 여기서 저항(RX)와 콘덴서(CX)에 의한 시정수를 TX라 할때 TX>TR(TR: d점 파형의 주기)가 되도록 시정수(TX)값을 설정하게 되면 c점 파형의 주기(Tm)동안 재트리거 멀티바이브레이터(30)의 출력단에는 제 2 도에 나타낸 e점 파형이 출력된다.This d point waveform is input to the retrigger multivibrator 30, where T X > T R (T R : d point when the time constant of the resistor R X and the capacitor C X is T X. When the time constant (T X ) is set to be the period of the waveform, the e-point waveform shown in FIG. 2 is output to the output terminal of the retrigger multivibrator 30 during the period Tm of the c-point waveform.
따라서, c점 파형의 주기(Tm)동안에 재트리거 멀티바이브레이터(30)으리 출력단에 나타난 e점 파형 신호는 트랙킹 스위치콘트롤부(40)로 부터의 출력신호와 함께 오어게이트(OR1)에 입력되어 게이트 됨에 따라, 오어게이트(OR1)의 출력신호가 트랙킹 서어보 스위치(S1)의 온, 오프를 제어하게 되므로서 미러의 슬립시에 발생되는 관성에 의한 힘을 감소시키게 되므로 제동 효과를 얻을 수가 있으며, 또한, 그의 출력신호 c점 파형에서 주기(Tm)동안에만 출력되므로, 제 3 도에 도시한 바와 같이 주기(Tm)를 벗어난 트랙킹 에러신호가 서어보계로 전달되는 것을 미연에 방지 할 수가 있는 것이다.Therefore, the e-point waveform signal displayed at the output terminal of the retrigger multivibrator 30 during the period Tm of the c-point waveform is input to the OR gate OR 1 together with the output signal from the tracking switch controller 40. As it is gated, the output signal of the OR gate OR 1 controls the on / off of the tracking servo switch S 1 , thereby reducing the force due to inertia generated when the mirror slips, thereby obtaining a braking effect. In addition, since the output signal is output only during the period Tm from the c point waveform thereof, as shown in FIG. 3, the tracking error signal outside the period Tm can be prevented from being transmitted to the servometer. It is.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850004129U KR880002689Y1 (en) | 1985-04-13 | 1985-04-13 | Tracking servo switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850004129U KR880002689Y1 (en) | 1985-04-13 | 1985-04-13 | Tracking servo switch control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR860013810U KR860013810U (en) | 1986-11-20 |
| KR880002689Y1 true KR880002689Y1 (en) | 1988-07-23 |
Family
ID=19241350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850004129U KR880002689Y1 (en) | 1985-04-13 | 1985-04-13 | Tracking servo switch control circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR880002689Y1 (en) |
-
1985
- 1985-04-13 KR KR2019850004129U patent/KR880002689Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR860013810U (en) | 1986-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE212718T1 (en) | INFORMATION PROCESSING DEVICE AND SCANNING TUNNEL MICROSCOPE | |
| CN1025706C (en) | Still/slow circuit for VTR with two heads | |
| KR880002689Y1 (en) | Tracking servo switch control circuit | |
| KR900016989A (en) | Magnetic regeneration device | |
| JPS6443091A (en) | Method of commutation control of coil strand of dc motor | |
| KR900013493A (en) | Optical disk device | |
| JPS5512912A (en) | Recording device for electrostatic | |
| KR920701975A (en) | Seek control device | |
| KR870000113Y1 (en) | Low-speed play control device of video tape recorder | |
| JPS645382A (en) | Magnetic recording regenerative unit | |
| KR930000755Y1 (en) | Error detecting circuit for viss signal | |
| KR940000875Y1 (en) | Inverter | |
| JPS6452258A (en) | Spindle motor drive circuit for disk player | |
| JPH025224A (en) | Speed controller for optical head | |
| KR940004333Y1 (en) | Still screen recording device of vtr | |
| JPS63220465A (en) | Motor control circuit | |
| KR890008783A (en) | Rotational Speed Control Method of Capstan Motor Using Reel Pulse Signal | |
| JPS6316804B2 (en) | ||
| JPS5752390A (en) | Rotational pulse detecting circuit for reel motor | |
| JPS57185780A (en) | Mode changing device | |
| KR970007834A (en) | Digital V C.R Head Actuator Control | |
| KR910008679A (en) | Multifunctional Mecha Position Expansion Control Device and Method | |
| KR970003026A (en) | Automatic tape insertion (INSERT) device in VCR | |
| JPS59148587A (en) | Brake device for printing head | |
| JPS6138540B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19971229 Year of fee payment: 11 |
|
| LAPS | Lapse due to unpaid annual fee |