KR100195181B1 - Tracking control method and its device of optical disk drive - Google Patents
Tracking control method and its device of optical disk drive Download PDFInfo
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- KR100195181B1 KR100195181B1 KR1019910017348A KR910017348A KR100195181B1 KR 100195181 B1 KR100195181 B1 KR 100195181B1 KR 1019910017348 A KR1019910017348 A KR 1019910017348A KR 910017348 A KR910017348 A KR 910017348A KR 100195181 B1 KR100195181 B1 KR 100195181B1
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- track deviation
- deviation signal
- optical
- inclination
- signal
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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
- G11B7/0953—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 eccentricity of the disc or disc tracks
-
- 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
- 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
Abstract
본 발명은 광디스크 드라이브의 광디스크 드라이브의 트래킹 제어방법 및 그 장치에 관한 것이다. 본 발명은 광픽업에서 디스크의 편심회전에 따른 수평트랙편차신호를 검출하고, 별도의 광원 및 광검출기를 이용하여 디스크의 경사에 따른 경사트랙편차신호를 검출하여, 상기 수평트랙편차신호와 상기 경사트랙편차신호의 차동신호로 상기 액튜에이터를 구동하는 것을 특징으로 하는 광디스크 드라이브의 트래킹 제어방법과, 광픽업에 광스포트의 반사광을 검출하는 광검출기를 가지며 이 광검출기로 부터 상기 디스크의 편심회전에 따른 수평트랙편차신호를 검출하는 수평트랙편차검지수단이 구비되고, 광픽업과는 별도로 설치된 광원 및 광검출기를 가지며, 그 광원으로 부터 조사된 광이 상기 디스크의 경사에 따라 반사되는 반사광으로 부터 법선방향 경사트랙편차신호로 검출하는 경사트랙편차검지수단과, 수평트랙편차신호와 상기 법선방향 경사트랙편차신호를 차동하기 위한 차동수단과, 원주방향 경사트랙편차신호를 검출하여 포커싱 편차신호로 사용하는 검지수단이 구비되어 액튜에이터가 상기 차동수단의 출력신호에 의하여 구동되도록 구성하여 된 것을 특징으로 하는 광디스크 드라이브의 트래킹 제어장치를 제공함에 특징이 있다. 따라서 트래킹 에러를 극소화 시킬수 있게 되고 광학계 설계상에 제약을 주지 않게 된다.The present invention relates to a tracking control method of an optical disc drive and an apparatus thereof. The present invention detects a horizontal track deviation signal according to an eccentric rotation of a disc in an optical pickup, detects an inclined track deviation signal according to the inclination of the disc by using a separate light source and a photodetector, and detects the horizontal track deviation signal and the inclination signal. A tracking control method for an optical disc drive, characterized in that the actuator is driven by a differential signal of a track deviation signal, and an optical detector for detecting reflected light of an optical spot in an optical pickup. A horizontal track deviation detecting means for detecting a horizontal track deviation signal, and having a light source and a photodetector provided separately from the optical pickup, and a normal direction from the reflected light reflected by the inclination of the disk. Inclination track deviation detection means for detecting inclination track deviation signal, horizontal track deviation signal and the normal direction And a differential means for differentially inclining track deviation signal and a detection means for detecting a circumferential gradient track deviation signal and using it as a focusing deviation signal so that the actuator is driven by the output signal of the differential means. It is characterized by providing a tracking control device for an optical disc drive. Therefore, the tracking error can be minimized and the design of the optical system is not restricted.
Description
제1도는 종래 광디스크 드라이브의 트래킹 제어장치를 보인 개략도.1 is a schematic view showing a tracking control device of a conventional optical disk drive.
제2도는 본 발명에 따른 광디스크 드라이브의 트래킹 제어장치를 보인 개략도.2 is a schematic view showing a tracking control device of an optical disk drive according to the present invention.
제3도는 제2도에 도시된 경사트랙편차 검지수단의 설치 위치를 보인 개략도.3 is a schematic view showing the installation position of the inclined track deviation detection means shown in FIG.
제4도는 제2도에 도시된 경사트랙편차 검지수단으로 경사트랙편차를 검지하는 상태를 보인 것으로서,4 is a view showing a state in which the inclined track deviation is detected by the inclined track deviation detecting means shown in FIG.
(a)는 디스크가 경사지지 않은 상태이고,(a) is the disk is not inclined state,
(b)(c)는 디스크가 경사진 상태이다.(b) and (c) show that the disk is inclined.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 광픽업 1a : 액튜에이터1: Optical pickup 1a: Actuator
3 : 수평트랙편차 검지수단 3a : 2분할 광검출기3: horizontal track deviation detection means 3a: two-segment photodetector
4 : 경사트랙편차 검지수단 4a : 광원4: slope track deviation detection means 4a: light source
4b, 4c : 4분할 광검출기 4d : 신호증폭수단4b, 4c: 4-split photodetector 4d: signal amplification means
5 : 차동수단 6 : 트래킹 서보 콘트롤러5: differential means 6: tracking servo controller
7 : 디스크 8 : 포커싱 서보 콘트롤러7: Disc 8: Focusing Servo Controller
본 발명은 광디스크 드라이브의 트랙킹 제어방법 및 그 장치에 관한 것으로서, 더 상세하게는 순수 수평트랙편차신호만을 검출하여 액튜에이터를 구동시킴으로써 트래킹 에러를 극소화시킬수 있도록 한 광디스크 드라이브의 트래킹 제어방법 및 그 장치에 관한 것이다.The present invention relates to a tracking control method and apparatus for an optical disk drive, and more particularly, to an optical disk drive tracking control method and apparatus for minimizing a tracking error by driving an actuator by detecting only a pure horizontal track deviation signal. will be.
종래의 광디스크 드라이브의 트래킹 제어장치는 일본 특개소 57-179954호로 개시되고 제1도에 도시되어 있는 바와 같이 기록정보독취용 광빔의 광축(10)과 디스크(D)의 기록면과의 직교상태를 검지하기 위해 보조빔을 대물렌즈(11)를 통해 디스크(D)의 기록면으로 조사시키는 보조광원(12)과, 상기 디스크(D)의 기록면으로부터 다시 대물렌즈(11)를 통해 반사되는 보조빔으로부터 트래킹 에러를 검출하는 한 쌍의 광검출기(13)와, 상기 광검출기(13)로부터 검출된 트래킹 에러신호를 차동증푹시키는 차동증폭기(14)와, 상기 차동증폭기(14)의 출력신호를 기준신호(15)와 감산하는 감산기(16)와, 상기 감산기(16)의 출력신호를 받아 광축(10)의 트래킹에러를 보정하는 광축경사기구(17)를 구비한다.The tracking control apparatus of a conventional optical disc drive is disclosed in Japanese Patent Laid-Open No. 57-179954 and, as shown in FIG. 1, detects an orthogonal state between the optical axis 10 of the optical beam for recording information reading and the recording surface of the disc D. Tracking from the auxiliary light source 12 for irradiating the auxiliary beam through the objective lens 11 to the recording surface of the disk D and from the auxiliary beam reflected back from the recording surface of the disk D through the objective lens 11. A pair of photodetectors 13 for detecting an error, a differential amplifier 14 for differentially amplifying the tracking error signal detected from the photodetector 13, and an output signal of the differential amplifier 14 are used as reference signals ( 15) and a subtractor 16 for subtracting, and an optical axis tilt mechanism 17 for correcting the tracking error of the optical axis 10 in response to the output signal of the subtractor 16.
이와 같이 구성된 종래 트래킹 제어장치는 보조광원(12)으로 부터 조사된 보조빔이 대물렌즈(11)를 통해 디스크(D)의 기록면으로 조사되고 이로부터 반사된 보조빔이 다시 대물렌즈(11)를 통해 한 쌍의 광검출기(13)로 조사되게 되는데, 이때 광축(10)과 디스크(D)의 기록면이 수직이면 실선과 같이 반사되게 되고 디스크(D)의 기록면이 점선으로 도시된 바와 같이 광축(10)과 경사지게 되면 보조빔은 일점쇄선으로 도시된 바와 같이 한쌍의 광검출기(13)에 각각 조사되게 되어 차동증폭기(14) 및 감산기(16)를 통해 광축경사기구(17)가 동작되어 광축(10)의 트래킹 에러를 보정하게 된다.In the conventional tracking control device configured as described above, the auxiliary beam irradiated from the auxiliary light source 12 is irradiated to the recording surface of the disc D through the objective lens 11, and the auxiliary beam reflected from the auxiliary lens 11 again returns the objective lens 11. When the recording surface of the optical axis 10 and the disk D is vertical, the recording surface of the disk D is reflected as a solid line, and the recording surface of the disk D is shown as a dotted line. 10), the auxiliary beam is irradiated to the pair of photodetectors 13, respectively, as shown by the dashed-dotted line, so that the optical axis tilt mechanism 17 is operated through the differential amplifier 14 and the subtractor 16 so that the optical axis ( The tracking error of 10) is corrected.
그러나 이와 같이 구성된 종래 트래킹 제어장치는 보조빔이 광검출기(13)에 정확하게 반사되기 위해서는 디스크(D)의 기록면이 대물렌즈(11)의 촛점에 위치하여야 하는데 만일 촛점위치보다 멀리 있거나 가까이 있을 경우에는 반사광의 광검출기(13)에서의 조사위치가 정확하지 않게 되어 포커싱 서보도 불가능하게 되는 경우가 있으며, 보조광원(12)이 대물렌즈(11)의 하방에 위치되므로 그만큼 기록정보 독취용 광빔을 사용하기 위한 대물렌즈(11)의 시야각이 좁아져 광학계 셜계상의 제약이 따르게 되는 문제점이 있었다.However, in the conventional tracking control device configured as described above, in order for the auxiliary beam to be accurately reflected to the photodetector 13, the recording surface of the disk D should be located at the focal point of the objective lens 11, In some cases, the irradiation position of the reflected light from the photodetector 13 may not be accurate, and thus the focusing servo may be impossible. Since the auxiliary light source 12 is located below the objective lens 11, the light beam for reading the recording information is used accordingly. There was a problem that the viewing angle of the objective lens 11 to be narrowed to follow the restrictions on the optical system.
또한 디스크가 경사지지 않은 상태로 회전할 경우에는 광검출기(13)가 순수 수평트랙편차신호만을 검출하게 되지만, 디스크가 경사진 상태로 회전할 경우에는 디스크의 수평트랙편차신호와 경사트랙편차신호가 복합되어 광검출기(13)로 검출되게 됨에 따라 광스포트를 트랙이 벗어난 만큼 정확하게 보상하여 줄 수 없는 문제점이 있었다.In addition, when the disc rotates without tilting, the photodetector 13 detects only a pure horizontal track deviation signal. However, when the disc rotates in an inclined state, the horizontal track deviation signal and the inclined track deviation signal of the disc are As it is combined and detected by the photodetector 13, there is a problem in that the optical spot cannot be compensated exactly as the track is departed.
본 발명은 상술한 바와 같은 문제점을 감안하여 창출된 것으로서, 순수 수평트랙편차신호만을 검출하여 광픽업의 액튜에이터를 구동시킴으로써 트래킹 에러를 극소화 시킬수 있도록 한 트래킹 제어방법 및 그 장치를 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a tracking control method and apparatus for minimizing tracking error by driving an actuator of an optical pickup by detecting only a pure horizontal track deviation signal. .
상기의 목적을 달성하기 위하여 본 발명 트래킹 제어방법은 디스크의 편심회전 및 경사에 의한 트랙편차를 보정하기 위하여, 광픽업으로부터 디스크상에 집속된 광스포트의 위치를 변위시키는 액튜에이터를 구동하는 광디스크 드라이브의 트래킹 제어방법에 있어서,In order to achieve the above object, the present invention provides a tracking control method of an optical disc drive for driving an actuator for displacing a position of an optical spot focused on a disc from an optical pickup, in order to correct a track deviation due to eccentric rotation and inclination of the disc. In the tracking control method,
상기 광픽업에서 상기 디스크의 편심회전에 따른 수평트랙편차신호를 검출하고, 광픽업광원과 종류가 동일한 변도의 광원 및 광검출기를 이용하여 상기 디스크의 경사에 따른 경사트랙편차신호를 검출하여, 상기 수평트랙편차신호와 상기 디스크 반경방향인 법선방향 경사트랙편차신호의 차동신호와, 디스크 회전방향인 원주방향 편차신호로 상기 액튜에이터를 구동시키도록 한 점에 그 특징이 있다.Detecting a horizontal track deviation signal according to the eccentric rotation of the disk in the optical pickup, Detecting the inclined track deviation signal according to the inclination of the disk using a light source and a photo detector of the same type as the optical pickup light source, The actuator is characterized in that the actuator is driven by the differential signal between the horizontal track deviation signal and the normal radial track deviation signal in the disc radial direction and the circumferential deviation signal in the disc rotation direction.
상기의 목적을 달성하기 위하여 본 발명의 트래킹 제어장치는 디스크의 편심회전 및 경사에 의한 트랙편차를 보정하기 위하여, 광픽업으로부터 디스크상에 집속된 광스포트의 위치를 변위시키는 액튜에이터를 구동하는 광디스크 드라이브의 트래킹 제어장치에 있어서, 상기 광픽업에, 상기 광스포트의 반사광을 검출하는 광검출기를 가지며 이 광검출기로부터 상기 디스크의 편심회전에 따른 수평트랙편차신호를 검출하는 수평트랙편차 검지수단이 구비되고, 상기 광픽업과는 별도로 설치된 광원 및 광검출기를 가지며, 그 광원으로 부터 조사된 광이 상기 디스크의 경사에 따라 반사되는 반사광으로 부터 경사트랙편차신호로 검출하는 경사트랙편차 검지수단과, 상기 수평트랙편차신호와 상기 경사트랙편차신호를 차동하기 위한 차동수단이 구비되어 액튜에이터가 상기 차동수단의 출력신호에 의하여 구동되도록 구성하여 된 점에 그 특징이 있다.In order to achieve the above object, the tracking control apparatus of the present invention is an optical disc drive for driving an actuator for displacing the position of the optical spot focused on the disc from the optical pickup, in order to correct the track deviation due to eccentric rotation and inclination of the disc. A tracking control apparatus according to claim 1, wherein the optical pickup has a photodetector for detecting reflected light of the optical spot, and a horizontal track deviation detecting means for detecting a horizontal track deviation signal according to an eccentric rotation of the disk from the photodetector. And inclination track deviation detection means for detecting a light source and a photodetector provided separately from the optical pickup, the inclination track deviation signal being detected from the reflected light reflected by the inclination of the disk with the light emitted from the light source, and the horizontal Differential means is provided to differential the track deviation signal from the inclined track deviation signal. It is characterized in that the actuator is configured to be driven by the output signal of the differential means.
이하 첨부된 도면을 참조하여 본 발명에 따른 한 바람직한 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.
제2도 내지 제4도에는 본 발명에 따른 트래킹 제어장치가 도시되어 있는 바, 이는 디스크(7)상에 광픽업(1)으로 부터 조사된 광을 집속시키는 대물렌즈(1b)와, 상기 디스크(7)의 편심회전 및 경사에 의한 트랙편차를 보정하기 위하여 상기 대물렌즈(1b)를 변위시켜 디스크(7)상에 집속된 광스포트의 위치를 변위시키는 액튜에이터(1a)와, 상기 광스포트의 반사광을 검출하는 광검출기를 가지며 이 광검출기로 부터 상기 디스크의 편심회전에 따른 수평트랙편차신호를 검출하는 수평트랙편차검지수단(3)과, 상기 광픽업(1)과 별도로 설치된 광원(4a) 및 광검출기를 가지며 그 광원으로 부터 조사된 광이 상기 디스크의 경사에 따라 반사되는 반사광으로 부터 경사트랙편차신호를 검출하는 경사트랙편차검지수단(4)과, 검지된 신호를 수평트랙편차신호와 같은 크기가 되도록 해주는 신호증폭수단(4d)과, 상기 수평트랙편차신호와 상기 경사트랙편차신호를 차동하는 차동수단(5)과, 이 출력수단(5)의 차동신호로 상기 액튜에이터(1a)를 구동시키는 트래킹 서보콘트롤러(6)와 포커싱 서보 콘트롤러(8)를 구비한다.2 to 4 show a tracking control device according to the present invention, which includes an objective lens 1b for condensing the light irradiated from the optical pickup 1 onto the disc 7, and the disc. An actuator 1a for displacing the objective lens 1b so as to correct the track deviation due to eccentric rotation and inclination of (7) and displacing the position of the focused light spot on the disc 7; A horizontal track deviation detecting means (3) for detecting the reflected light and detecting a horizontal track deviation signal according to the eccentric rotation of the disk from the photodetector, and a light source (4a) provided separately from the optical pickup (1) And an inclination track deviation detecting means (4) having a photodetector for detecting the inclination track deviation signal from the reflected light from which the light irradiated from the light source is reflected according to the inclination of the disc, and the detected signal as a horizontal track deviation signal. Same size A signal amplifying means (4d), a differential means (5) for differentializing the horizontal track deviation signal and the inclined track deviation signal, and driving the actuator (1a) with a differential signal of the output means (5). A tracking servo controller 6 and a focusing servo controller 8 are provided.
상기 수평트랙편차 검지수단(3)은 광검출기가 2분할 광검출기(3a)로 되며, 상기 수평트랙편차신호가 상기 2분할 광검출기(3a)의 두 영역에서 각각 검출되는 신호들의 차동신호로 이루어진다.The horizontal track deviation detecting means 3 includes a photodetector as a two-segment photodetector 3a, and the horizontal track deviation signal consists of differential signals of signals respectively detected in two regions of the two-segment photodetector 3a. .
상기 경사트랙편차 검지수단(4)은 광검출기가 교차방향으로 배치된 4분할 광검출기(4b)(4c)로 되며, 상기 경사트랙편차신호가 상기 4분할 광검출기(4b)의 네 영역중 대각선 방향으로 마주보는 두영역에서 각각 검출되는 신호들의 차동신호인 법선방향 트랙편차신호와 원주방향 경사편차신호로 이루어진다.The inclined track deviation detecting means 4 is divided into four divided photodetectors 4b and 4c in which the photodetectors are arranged in the cross direction, and the inclined track deviation signal is diagonal among four regions of the four divided photodetector 4b. It consists of a normal track deviation signal and a circumferential gradient deviation signal, which are differential signals of signals detected in two regions facing each other in the direction.
그리고 상기 경사트랙편차 검지수단(4)은 그 광원으로 부터 조사되는 광의 광축이 상기 광픽업(1)으로 부터 조사되는 광스포트의 광축과 디스크상의 동일 원주상에 위치되도록 배치되며, 상기 경사트랙편차 검지수단(4)은 상기 광픽업상(1)에 탑재되어 광픽업과 함께 이동되거나 디스크에 대하여 고정설치되는 것이 바람직하다.The inclination track deviation detection means 4 is arranged such that the optical axis of the light irradiated from the light source is located on the same circumference of the optical axis of the light spot irradiated from the optical pickup 1 and on the disc. The detection means 4 is preferably mounted on the optical pickup 1 to move with the optical pickup or to be fixed to the disk.
이와 같이 구성된 본 발명에 따른 광디스크 드라이브의 트래킹 제어장치는 다음과 같이 작동된다.The tracking control apparatus of the optical disk drive according to the present invention configured as described above operates as follows.
먼저 광픽업(1)으로 부터 조사되는 광이 대물렌즈(1b)에 의해 디스크(7)상에 집속되고 이 디스크(7)로 부터 반사되는 광스포트의 반사광은 수평트랙편차 검지수단(3)인 2분할 검출기(3a)에 의해 수평트랙편차신호로 검출되는데, 이때 이 수평트랙편차신호는 상기 2분할 검출기(3a)의 두영역에서 각각 검출되는 신호들의 차동신호가 된다. 그리고 경사트랙편차 검지수단(4)의 광원(4a)으로부터 디스크상에 조사되고 이 디스크로부터 반사된 광은 4분할 광검출기(4b)(4c)에 의해 경사트랙편차신호로 검출되게 되는데, 이때 상기 경사트랙편차신호는 상기 4분할 광검출기(4b)의 네 영역중 대각선방향으로 마주보는 두 영역에서 법선방향의 경사트랙편차신호는 2개의 광검출기(4b)에서 검출되고, 원주방향의 편차신호는 나머지 2개의 광검출기(4c)에서 검출되어 이는 포커싱편차신호로 분리되어 검출된다. 검출된 이 신호들은 수평트랙편차신호와 일정한 크기의 포커싱편차신호가 되도록 조정되어진다.First, the light irradiated from the optical pickup 1 is focused on the disk 7 by the objective lens 1b, and the reflected light of the light spot reflected from the disk 7 is the horizontal track deviation detecting means 3. The two-segment detector 3a detects a horizontal track deviation signal, which is a differential signal of signals respectively detected in two regions of the two-segment detector 3a. The light irradiated onto the disk from the light source 4a of the inclination track deviation detecting means 4 and reflected from the disk is detected as the inclination track deviation signal by the four-segment photodetectors 4b and 4c. The inclined track deviation signal is detected in two of the four regions of the four-segment photodetector 4b facing in the diagonal direction, and the inclined track deviation signal in the normal direction is detected by the two photodetectors 4b. It is detected by the remaining two photodetectors 4c and separated into a focusing deviation signal. These detected signals are adjusted to be a horizontal track deviation signal and a focusing deviation signal of a constant magnitude.
그리고 상기 수평트랙편차신호와 상기 법선방향 트랙편차신호를 차동수단(5)으로서 차동시키게 되는데, 이는 상기 수평트랙편차신호가 디스크의 수평트랙편차신호 이외에도 법선방향 트랙편차신호를 포함하고 있으므로 상기 수평트랙편차 검지수단(3)에서 검지된 수평트랙편차신호에서 상기 법선방향 트랙편차검지수단(4)에서 검지된 법선방향 트랙편차신호를 빼주어야만 순수 수평트랙편차신호를 얻을 수 있기 때문이다. 그리고 상기 차동수단(5)에 의해 차동된 출력신호가 트래킹 서보 콘트롤러(6)에 입력되고 이 트래킹 서보 콘트롤러(6)가 상기 차동수단(5)의 출력신호에 따라 액튜에이터(1a)를 구동시켜 디스크상에 집속된 광픽업의 광스포트의 위치를 변위시키게 됨에 따라 디스크의 편심회전 및 경사에 의한 트랙편차를 정확하게 보정할 수 있게 된다. 또한 증폭된 원주방향의 편차신호는 포커싱서보콘트롤러(8)에 입력되고 액튜에이터(1a)를 구동시켜 광픽업의 광촛점을 디스크에 맺게 해준다.The horizontal track deviation signal and the normal track deviation signal are differentiated as the differential means (5), since the horizontal track deviation signal includes the normal track deviation signal in addition to the horizontal track deviation signal of the disc. This is because a purely horizontal track deviation signal can be obtained only by subtracting the normal track deviation signal detected by the normal track deviation detection means 4 from the horizontal track deviation signal detected by the deviation detecting means 3. The output signal differentiald by the differential means 5 is input to the tracking servo controller 6, and the tracking servo controller 6 drives the actuator 1a in accordance with the output signal of the differential means 5 to drive the disk. As the position of the optical spot of the optical pickup focused on the image is displaced, it is possible to accurately correct the track deviation due to the eccentric rotation and the inclination of the disk. In addition, the amplified deviation signal in the circumferential direction is input to the focusing servo controller 8 to drive the actuator 1a to bring the optical focus of the optical pickup onto the disk.
이상에서 설명한 바와 같이 본 발명 광디스크 드라이브의 광디스크 드라이브의 트래킹 제어방법 및 그 장치는 수평트랙편차 검지수단에서 검지된 경사트랙편차신호가 포함된 수평트랙편차신호에서 법선방향 경사트랙편차신호 검지수단에서 검지된 경사트랙편차신호를 빼주어 순수 수평트랙편차신호만큼 액튜에이터를 구동시킬 수 있게 됨에 따라 트랙편차를 정확하게 보정할 수 있어 트래킹 에러를 극소화 시킬수 있게되며, 경사트랙편차신호 검지수단이 광픽업의 대물렌즈를 가리지 않게 되어 종래 대물렌즈는 가림으로 인해 발생되던 광학계 설계상의 문제점을 해소할 수 있게 된다.As described above, the tracking control method and apparatus of the optical disk drive of the optical disk drive of the present invention detect the horizontal track deviation signal including the inclined track deviation signal detected by the horizontal track deviation detection means by the normal inclination track deviation signal detection means. Since the actuator can be driven by the pure horizontal track deviation signal by subtracting the inclined track deviation signal, the tracking deviation can be corrected accurately and the tracking error can be minimized, and the inclination track deviation signal detection means is an optical pickup objective lens. Since the conventional objective lens is not obscured, it is possible to solve the problem of the optical system design caused by the obstruction.
Claims (8)
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| KR100403084B1 (en) * | 2001-02-20 | 2003-10-30 | 엘지전자 주식회사 | Driving control method for radial tilting of optical pick-up acatuator |
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| KR100403084B1 (en) * | 2001-02-20 | 2003-10-30 | 엘지전자 주식회사 | Driving control method for radial tilting of optical pick-up acatuator |
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