KR20010045985A - An apparatus and method for detecting a vibration of a disc - Google Patents
An apparatus and method for detecting a vibration of a disc Download PDFInfo
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- KR20010045985A KR20010045985A KR1019990049540A KR19990049540A KR20010045985A KR 20010045985 A KR20010045985 A KR 20010045985A KR 1019990049540 A KR1019990049540 A KR 1019990049540A KR 19990049540 A KR19990049540 A KR 19990049540A KR 20010045985 A KR20010045985 A KR 20010045985A
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- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
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- 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
- G11B7/0946—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 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
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- 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
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- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
본 발명은 디스크형의 회전 기록매체에 데이터를 기록 또는 재생함에 있어서, 기록매체의 회전에 의한 디스크면의 진동을 검출하는 방법 및 장치에 관한 것이다.The present invention relates to a method and apparatus for detecting vibration of a disk surface caused by rotation of a recording medium in recording or reproducing data on a disk-type rotating recording medium.
기술의 발전에 따라 디스크 형태의 기록매체가 널리 사용되고 있으며, 특히 기록밀도의 증가에 따라서 CD, DVD 또는 광자기 디스크(MOD)등 여러 종류의 디스크가 이용되고 있으며, 여러나라에서 다양한 종류의 디스크를 제조하고 있다.With the development of technology, disc-type recording media are widely used. In particular, various types of discs such as CD, DVD, or magneto-optical disc (MOD) are being used with increasing recording density. Manufacture.
이와 같은 광 디스크 또는 광자기 디스크(이하 통칭하여 '광 디스크'라 함)는 제조공정상의 오류, 제조공정상의 편차와 같은 선천적인 요인으로 인해, 또는 유통 및 사용자의 부주의에 의한 후천적인 요인 등으로 인해 디스크가 상하로 휘거나 비틀어지는 경우가 생기게 된다.Such optical discs or magneto-optical discs (hereinafter referred to as 'optical discs') are due to inherent factors such as manufacturing process errors, manufacturing process deviations, or acquired factors due to distribution and user's carelessness. This causes the disk to bend or twist up and down.
이와 같은 결함을 갖는 광 디스크로 부터 기록신호를 재생하는 경우에, 디스크의 휨에 따른 면진동이 생기게 되고, 이 면진동 성분이 허용범위 이상으로 발생하거나 또는 디스크의 휨에 따른 래디얼(radial) 방향으로 굴곡되는 Skew 현상이 발생할 수 있는데, 이렇게 되면 디스크의 재생시에 정확한 포커싱 동작 및 트랙킹 동작이 이루어지지 않아 재생영상이 끊어지거나 심한 경우에는 아예 디스크의 재생이 이루어지지 않게 되는 문제점이 있었다.In the case of reproducing a recording signal from an optical disk having such a defect, surface vibration occurs due to the bending of the disk, and this surface vibration component occurs beyond the allowable range or the radial direction due to the bending of the disk. The skew phenomenon may occur, which causes a problem in that the disc does not play at all or in severe cases due to the lack of accurate focusing and tracking operations.
따라서, 이와 같이 휘어진 디스크와 같은 문제의 디스크에 대비하여 재생전에 래디얼 조정, 디포커스(defocus) 조절등과 같은 보상동작을 수행해야 하는데, 이러한 조절동작은 시간이 많이 소요되므로, 정상적인 광 디스크인 경우에는 사용자를 지루하게 하는 문제점이 생기게 되므로, 상기의 보상동작을 수행해야 할지를 미리 판단해야 할 필요성이 있다.Therefore, in order to prepare for a problem disc such as a curved disc, a compensation operation such as a radial adjustment, a defocus adjustment, etc. must be performed before playback. This adjustment operation takes a long time, and thus is a normal optical disc. Since there is a problem of boring the user, there is a need to determine in advance whether to perform the above compensation operation.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위해 창작된 것으로서, 광 디스크로 부터의 면진동 발생시에도 광 디스크의 정상재생이 이루어지도록 하는 광 디스크의 면진동 검출장치 및 검출방법을 제공하는 데 그 목적이 있는 것이다.Accordingly, the present invention has been made to solve the above problems, and provides an apparatus and a method for detecting the surface vibration of an optical disk such that normal reproduction of the optical disk is performed even when the surface vibration is generated from the optical disk. There is a purpose.
도1은 본 발명에 따른 광 디스크의 면진동 검출장치가 구현된 광 디스크 구동장치의 바람직한 일 실시예의 구성을 도시한 것이고,Fig. 1 shows the configuration of a preferred embodiment of the optical disk drive apparatus in which the surface vibration detection device of the optical disk according to the present invention is implemented.
도2는 본 발명에 따른 광 디스크의 면진동 검출방법의 바람직한 일 실시예의 흐름을 도시한 것이고,Figure 2 shows the flow of a preferred embodiment of the surface vibration detection method of the optical disk according to the present invention,
도3은 저역여파된 포커싱 에러신호의 형태를 도시한 것이고,3 shows a form of a low-pass focused error signal,
도4는 래디얼(radial) 방향으로 휘어진 광 디스크의 형태를 도시한 것이고,Figure 4 shows the shape of an optical disk bent in the radial direction,
도5는 광 디스크의 면진동 검출위치를 예를 들어 도시한 것이다.Fig. 5 shows an example of the surface vibration detection position of the optical disk.
※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing
10 : 광 디스크 20 : 광픽업10: optical disc 20: optical pickup
30 : R/F 40 : 서보부30: R / F 40: Servo part
50 : 드라이버부 60 : 디지털신호 처리부50 driver 60 digital signal processing
70 : 저역필터 71 : A/D 변환기70: low pass filter 71: A / D converter
80 : 마이컴 M1 : 슬레드모터80: micom M1: sled motor
M2 : 스핀들모터M2: Spindle Motor
상기와 같은 목적을 달성하기 위한 본 발명에 따른 광 디스크의 면진동 검출장치는, 광 디스크를 회전구동시키는 구동수단; 상기 광 디스크 상의 기록신호를 검출하는 독출수단; 상기 회전구동되는 광 디스크에 대해 상기 독출수단의 포커싱 서보를 수행하는 서보수단; 및 상기 광 디스크의 회전동안 포커싱 서보 제어되는 상기 독출수단에서 출력되는 포커싱 에러신호의 크기를 검출하여 그 값에 따라 상기 광 디스크의 면진동 여부를 판별하는 제어수단을 포함하여 구성되는 것에 특징이 있는 것이며,In accordance with an aspect of the present invention, there is provided an apparatus for detecting a surface vibration of an optical disk, comprising: driving means for rotating the optical disk; Reading means for detecting a recording signal on the optical disc; Servo means for performing a focusing servo of said reading means with respect to said rotationally driven optical disk; And control means for detecting the magnitude of the focusing error signal output from the reading means controlled by the focusing servo during rotation of the optical disk and determining whether the optical disk is oscillated according to the value thereof. Will be
또한, 본 발명에 따른 광 디스크의 면진동 검출방법은, 포커싱 서보의 활성상태에서, 광 디스크를 적어도 1회 이상 회전구동시키는 제 1단계; 상기 제 1단계 동안 출력되는 포커싱 에러신호의 크기를 검출하는 제 2단계; 및 상기 검출된 신호크기에 따라 상기 광 디스크의 면진동 여부를 판별하는 제 3단계를 포함하여 이루어지는 것에 특징이 있는 것이다.In addition, the surface vibration detection method of the optical disk according to the present invention comprises: a first step of rotating the optical disk at least once in the active state of the focusing servo; A second step of detecting a magnitude of a focusing error signal output during the first step; And a third step of determining whether the optical disk vibrates according to the detected signal size.
이하, 본 발명에 따른 광 디스크의 면진동 검출장치 및 검출방법의 바람직한 실시예에 대해 첨부된 도면에 의거하여 설명하면 다음과 같다.Hereinafter, a preferred embodiment of the surface vibration detection device and detection method for an optical disk according to the present invention will be described with reference to the accompanying drawings.
도1은 본 발명에 따른 광 디스크의 면진동 검출장치가 구현된 광 디스크 구동장치의 바람직한 일 실시예의 구성을 도시한 것으로서, 광 디스크(10) 상의 기록데이터를 독출하는 광픽업(20); 상기 픽업부(20)에서 검출되는 신호를 여파정형화시켜 이진신호로 출력하는 R/F부(30); 상기 픽업부(20)의 트래킹 에러(T.E) 및 포커스 에러(F.E)신호와 광 디스크(10)의 회전속도로 부터 상기 드라이브부(50)의 구동을 제어하는 서보부(40); 상기 광픽업(10)을 수평으로 이동시키는 슬레드모터(M1); 상기 서보부(40)로 부터 출력되는 제어신호에 따라 상기 광 디스크(10)를 회전시키는 스핀들모터(M2); 상기 슬레드모터(M1) 및 스핀들모터(M2)를 구동시키는 드라이버(50); 상기 이진신호에 위상동기된 자체클럭으로 상기 이진신호를 원래의 데이터로 복원하는 디지털신호 처리부(60); 상기 광픽업(10)의 포토 다이오드(PD)로 부터 출력되는 포커싱 에러신호를 대역여파시키는 저역필터(LPF)(70); 상기 저역필터(70)로 부터 출력되는 포커싱 에러신호를 디지털 변환하는 A/D 변환기(71); 상기 A/D 변환기(71)의 변환값으로 부터 상기 광 디스크(10)의 면진동(또는 Skew) 크기를 검출하는 마이컴(80)을 포함하여 구성되어 있다.Fig. 1 shows the configuration of a preferred embodiment of the optical disk drive apparatus in which the surface vibration detection device of the optical disk according to the present invention is implemented, comprising: an optical pickup 20 for reading recorded data on the optical disk 10; An R / F unit 30 for filtering the signal detected by the pickup unit 20 and outputting it as a binary signal; A servo unit 40 for controlling the driving of the drive unit 50 from the tracking error (T.E) and focus error (F.E) signals of the pickup unit 20 and the rotational speed of the optical disc 10; A sled motor (M1) for horizontally moving the optical pickup (10); A spindle motor (M2) for rotating the optical disk (10) in accordance with a control signal output from the servo unit (40); A driver (50) for driving the sled motor (M1) and the spindle motor (M2); A digital signal processor (60) for restoring the binary signal to original data with its own clock synchronized with the binary signal; A low pass filter (LPF) 70 for band-filtering a focusing error signal output from the photodiode PD of the optical pickup 10; An A / D converter (71) for digitally converting a focusing error signal output from the low pass filter (70); And a microcomputer 80 for detecting the size of the surface vibration (or skew) of the optical disk 10 from the converted value of the A / D converter 71.
도2는 본 발명에 따른 광 디스크의 면진동 검출방법의 바람직한 일 실시예의 흐름을 도시한 것으로서, 이하에서는 도1의 구성을 참조하여 본 발명에 따른 도2의 검출방법에 대해 상세히 설명한다.Figure 2 shows the flow of a preferred embodiment of the surface vibration detection method of the optical disk according to the present invention, the following describes the detection method of Figure 2 according to the present invention in detail with reference to the configuration of FIG.
먼저, 광 디스크 구동장치에 구비된 트레이(Tray)(미도시)에 광 디스크(10)가 삽입안착(S10)되어 초기화되면, 상기 마이컴(80)은 상기 서보부(40)와 드라이브부(50)를 통해 상기 스핀들 모터(M2)에 구동전압을 인가하여 상기 광 디스크(10)를 초기회전시켜, 광 디스크(10)를 CLV(Constant Linear Velocity) 온상태와 거의 유사한 재생가능한 상태가 되도록 한다.First, when the optical disk 10 is inserted and seated (S10) in a tray (not shown) provided in the optical disk driving apparatus, the microcomputer 80 is the servo unit 40 and the drive unit 50. By applying a drive voltage to the spindle motor (M2) through the initial rotation of the optical disk 10, the optical disk 10 is brought into a reproducible state almost similar to the CLV (Constant Linear Velocity) on state.
이와 함께, 상기 마이컴(80)은 상기 광픽업(20)을 광 디스크(10)로 부터의 면진동 발생여부를 용이하게 검출할 수 있는 적정위치, 예를 들면 최외주에 근접한 쪽으로 이동(S11)시킨 후, 상기 광픽업(20)으로 하여금 광 디스크(10)의 현재위치로 부터 기록신호를 검출하도록 하는데, 이때 상기 마이컴(80)은 상기 광픽업(20)의 액츄에이터 내에 구비된 대물렌즈의 위치를 가변제어하는 포커싱(Focusing) 서보동작과, 트랙킹(Tracking) 서보동작이 온상태가 되도록 한다.In addition, the microcomputer 80 moves the optical pickup 20 to an appropriate position, for example, close to the outermost circumference, to easily detect whether surface vibration is generated from the optical disk 10 (S11). Afterwards, the optical pickup 20 detects a recording signal from the current position of the optical disk 10. In this case, the microcomputer 80 has a position of an objective lens provided in the actuator of the optical pickup 20. The focusing servo operation and the tracking servo operation to variably control are turned on.
이와 같은 동작상태에서, 상기 저역필터(70)는 상기 광픽업(10)의 포토 다이오드로 부터 출력되는 포커싱 에러신호를 저역여파하여 고주파노이즈를 제거한 신호를 출력하는데, 그 신호형태의 예는 도3에 도시된 바와 같다.In such an operation state, the low pass filter 70 outputs a signal from which high frequency noise is removed by low pass filtering a focusing error signal output from the photodiode of the optical pickup 10. An example of the signal type is shown in FIG. As shown in.
도3과 같은 에러신호가 검출되는 경우는 회전되는 디스크가 도4에 예시된 바와 같이, 래디얼 방향으로 휘어져 있게 되면 대물렌즈와 디스크 간의 거리가 디스크 회전에 따라 가변하게 되므로 포커싱 서보가 이를 추종하기 위하여 디스크와의 거리변화에 따른 에러신호를 출력하기 때문이다.In the case where an error signal as shown in FIG. 3 is detected, as shown in FIG. 4, when the rotating disk is bent in the radial direction, the distance between the objective lens and the disk is varied according to the rotation of the disk. This is because an error signal is output in accordance with the change in distance from the disk.
이에 따라, 상기 A/D 변환기(71)는 상기 광 디스크(10)의 회전동안의 포커싱 에러신호를 샘플링하여(S12) 상기 마이컴(80)으로 출력하고, 이에 따라 상기 마이컴(80)은 상기 입력된 값의 최대값과 최소값의 차이로 부터 안착된 광 디스크(10)의 면진동 크기를 검출(S13)하게 된다.Accordingly, the A / D converter 71 samples the focusing error signal during the rotation of the optical disk 10 (S12) and outputs it to the microcomputer 80, whereby the microcomputer 80 inputs the input. From the difference between the maximum value and the minimum value of the detected value, the magnitude of the surface vibration of the mounted optical disc 10 is detected (S13).
만약 상기 마이컴(80)이 검출한 진폭값이 상기 광 디스크(10)가 상하로 휘어져(또는 디스크 안착상의 문제로 인해) 허용범위 이상인 경우에는(S20), 상기 마이컴(80)은 상기 광 디스크(10)의 회전속도(재생배속)를 저배속으로 가변조정(S21)하거나, 또는 이를 보상하기 위한 래디얼 조정, 디포커스 조절 등의 예정된 적정 조치를 취한후 안착된 디스크의 재생을 시작하게 된다.If the amplitude value detected by the microcomputer 80 is greater than the allowable range because the optical disk 10 is bent up and down (or due to a problem on the disk seating) (S20), the microcomputer 80 may be configured to the optical disk ( 10) After adjusting the rotational speed (playback speed) to a low speed (S21), or taking a predetermined appropriate measure such as radial adjustment or defocus control to compensate for this, playback of the seated disc is started.
재생이 시작되면, 상기 R/F부(30)는 상기 광픽업(20)이 검출한 고주파신호를 여파정형화하고 상기 디지털신호 처리부(60)는 상기 R/F부(30)로 부터 입력되는 고주파신호를 디지털 신호처리하여 재생출력함으로써, 상기 마이컴(80)의 동작제어하에 상기 광 디스크(10)의 재생동작이 이루어지게 된다.When the reproduction starts, the R / F unit 30 filters the high frequency signal detected by the optical pickup 20 and the digital signal processing unit 60 receives the high frequency input from the R / F unit 30. By reproducing and outputting the signal by digital signal processing, the reproducing operation of the optical disc 10 is performed under the operation control of the microcomputer 80.
전술한 면진동 검출방법에서 상기 마이컴(80)은 면진동 검출위치를 도5에서와 같이 내주, 중주 및 외주로 하여 이에 대해 각각 수행한 뒤 각 포커싱 범위의 폭을 비교하여 디스크의 래디얼 Skew도 파악할 수 있다.In the above-described surface vibration detection method, the microcomputer 80 performs the surface vibration detection positions as the inner circumference, the middle circumference, and the outer circumference as shown in FIG. Can be.
이와 같이 디스크의 Skew 정도가 파악되면, 그에 따라 디스크 영역의 국부별로 보상동작을 수행하게 된다.When the skew level of the disk is known as described above, a compensation operation is performed for each local part of the disk region.
만약, 전술한 검출과정(S13)에서 포커싱 범위(최대값과 최소값의 차값)가 허용범위 이내인 경우에는 정상적인 재생이 가능한 디스크로 판별하여, 상기와 같은 보상동작을 수행하지 않고 디스크의 재생동작을 바로 시작하게 된다(S23).If the focusing range (difference between the maximum value and the minimum value) is within the allowable range in the above-described detection process (S13), the disc is determined as a disc capable of normal playback, and the disc playback operation is performed without performing the above compensation operation. It will start immediately (S23).
상기와 같이 구성되어 이루어지는 본 발명에 따른 광 디스크의 면진동 검출장치 및 검출방법은, 재생전 광 디스크의 면진동 또는 Skew 정도를 검출하여 이에 의해 보상동작이 선택적으로 이루어지게 함으로써, 정상 디스크의 경우 재생 지연시간이 없으며, 휨과 같은 문제의 디스크는 오류없이 정상적인 재생이 이루어지게 되는 유용한 발명인 것이다.The apparatus and method for detecting the surface vibration of an optical disk according to the present invention, which is configured as described above, detects the surface vibration or skew degree of the optical disk before reproducing, thereby selectively performing a compensation operation, and thus, in the case of a normal disk. There is no play delay time, and a disc in question, such as warping, is a useful invention in which normal play is performed without error.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040031391A (en) * | 2002-10-05 | 2004-04-13 | 삼성전자주식회사 | Apparatus and method for detecting a tilt disc |
| WO2004048896A1 (en) * | 2002-11-28 | 2004-06-10 | Koninklijke Philips Electronics N.V. | Movement determination apparatus and method |
| KR20040062258A (en) * | 2003-01-02 | 2004-07-07 | 삼성전자주식회사 | A focus error control method, a speed control method thereof, and apparatuses therefor |
| KR100662904B1 (en) * | 2004-03-09 | 2007-01-02 | 삼성전자주식회사 | The method and device for discriminating the deflecting disc |
| KR100813946B1 (en) * | 2001-09-01 | 2008-03-14 | 삼성전자주식회사 | Recording and reproducing apparatus, method for calculating deflection, reproducing system, and recording and reproducing system of optical storage media |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62212508A (en) * | 1986-03-14 | 1987-09-18 | Seiko Epson Corp | Method for measuring surface deflection |
| JPH02187933A (en) * | 1989-01-13 | 1990-07-24 | Hitachi Maxell Ltd | Inclination angle measuring method |
| JPH02198062A (en) * | 1989-01-26 | 1990-08-06 | Sony Corp | Optical disk reproducing device |
| JPH07130079A (en) * | 1993-11-05 | 1995-05-19 | Fujitsu General Ltd | Device for displaying wobbly surface warning of write once optical disk |
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1999
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100813946B1 (en) * | 2001-09-01 | 2008-03-14 | 삼성전자주식회사 | Recording and reproducing apparatus, method for calculating deflection, reproducing system, and recording and reproducing system of optical storage media |
| KR20040031391A (en) * | 2002-10-05 | 2004-04-13 | 삼성전자주식회사 | Apparatus and method for detecting a tilt disc |
| WO2004048896A1 (en) * | 2002-11-28 | 2004-06-10 | Koninklijke Philips Electronics N.V. | Movement determination apparatus and method |
| KR20040062258A (en) * | 2003-01-02 | 2004-07-07 | 삼성전자주식회사 | A focus error control method, a speed control method thereof, and apparatuses therefor |
| KR100662904B1 (en) * | 2004-03-09 | 2007-01-02 | 삼성전자주식회사 | The method and device for discriminating the deflecting disc |
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