KR100521921B1 - Method and apparatus for measuring axial vibration of a disk - Google Patents
Method and apparatus for measuring axial vibration of a disk Download PDFInfo
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- KR100521921B1 KR100521921B1 KR10-2002-0039056A KR20020039056A KR100521921B1 KR 100521921 B1 KR100521921 B1 KR 100521921B1 KR 20020039056 A KR20020039056 A KR 20020039056A KR 100521921 B1 KR100521921 B1 KR 100521921B1
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- optical recording
- surface vibration
- focusing operation
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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
- 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
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10388—Improvement or modification of read or write signals signal quality assessment control of the read or write heads, e.g. tracking errors, defocus or tilt compensation
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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
- G11B7/0901—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
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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
- G11B7/0908—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 focusing only
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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
Abstract
디스크 장치에서의 회전하는 디스크의 면진동을 판별하는 방법 및 장치에 관한 것으로서, 본 발명의 면진동 판별방법은, 광 기록매체의 원주상에서, 포커싱 동작을 수행할 지점을 일정간격( 45도 내지 120도)으로 선정하고, 상기 선정된 각 위치에서 포커싱 동작을 수행하며, 상기 각 포커싱 동작의 시작부터 정확한 포커싱이 될 때까지의 포커싱 소요시간을 측정한 다음, 상기 측정된 각 포커싱 소요시간의 편차에 근거하여 상기 광 기록매체의 면진동 양을 검출한다. 이 방법에 의해 회전하는 디스크의 면진동 양을 정확히 얻을 수 있다.The present invention relates to a method and apparatus for determining the surface vibration of a rotating disk in a disk apparatus, wherein the method for determining the surface vibration of the present invention comprises a predetermined interval (45 degrees to 120 degrees) on a circumference of an optical recording medium. Fig. 3), and perform a focusing operation at each of the selected positions, measure a focusing time from the start of each focusing operation to the correct focusing, and then measure the deviation of each measured focusing time. On the basis of this, the amount of surface vibration of the optical recording medium is detected. By this method, the amount of surface vibration of the rotating disk can be obtained accurately.
Description
본 발명은, 디스크 장치에서의 회전하는 디스크의 면진동을 판별하는 방법 및 장치에 관한 것이다. The present invention relates to a method and apparatus for determining the surface vibration of a rotating disk in a disk device.
광디스크 장치는, 장치 내에 삽입 안착된 씨디 또는 디브이디 등과 같은 광디스크를 스핀들(Spindle) 모터를 이용하여 고속 회전시키면서, 상기 광디스크에 대한 광픽업의 대물렌즈의 포커싱(Focusing) 동작과 트래킹(Tracking) 동작을 수행하여, 상기 광디스크의 기록면에 기록된 신호를 독출 재생하는 재생동작을 수행하게 된다. The optical disk device rotates an optical disk such as a CD or DVD inserted into the apparatus at a high speed by using a spindle motor, and performs focusing and tracking operations of the objective lens of the optical pickup to the optical disk. A reproduction operation of reading out and reproducing the signal recorded on the recording surface of the optical disc is performed.
재생동작 중에는, 디스크에서 반사된 빔으로부터 생성되는 포커싱에러 및 트래킹 에러신호에 따라 대물렌즈의 포커싱과 트래킹을 조절하면서, 신호가 최적으로 읽혀지도록 하는 서보동작을 수행한다. During the reproducing operation, the servo operation is performed so that the signal is optimally read while adjusting the focusing and tracking of the objective lens according to the focusing error and the tracking error signal generated from the beam reflected from the disk.
그러나, 상기와 같이 스핀들 모터에 의해 고속으로 회전되는 광디스크가 상하로 진동하는 경우, 즉, 면진동 성분이 존재하면, 포커싱이 제대로 이루어지지 않는다. 따라서, 포커싱의 민감도를 높이기 위해 포커싱 서보의 게인(gain)을 조절할 필요가 있다. However, when the optical disk rotated at a high speed by the spindle motor as described above vibrates up and down, that is, when the surface vibration component is present, focusing is not performed properly. Therefore, it is necessary to adjust the gain of the focusing servo to increase the sensitivity of the focusing.
또한, 면진동 성분이 상당히 커서, 포커싱 서보의 게인조절로 추종이 불가능한 경우에는, 고속상태에서는 정상적인 재생동작이 불가능하기 때문에, 스핀들 모터의 회전속도를 감속시키거나, 또는 이젝트(Eject)시켜야 한다. In addition, when the surface vibration component is considerably large and tracking cannot be performed by gain adjustment of the focusing servo, since the normal regeneration operation is impossible at high speed, the rotational speed of the spindle motor must be slowed down or ejected.
이런 이유로 회전하는 디스크의 면진동 량을 정확히 측정해야 할 필요가 있는 것이다.For this reason, it is necessary to accurately measure the surface vibration of rotating disks.
본 발명은 상기와 같은 필요성에 의해 창작된 것으로서, 재생할 광디스크의 면진동 성분을 정확히 측정하는 방법을 제공하는 것이다.The present invention has been made by the necessity as described above, and provides a method for accurately measuring the surface vibration component of an optical disk to be reproduced.
본 발명의 또 다른 목적은 면진동이 있는 디스크에 대응하여 포커싱 서보가 추종되도록 하는 방법을 제공하는 것이다.It is still another object of the present invention to provide a method for causing the focusing servo to be followed in correspondence with a disk having a surface vibration.
본 발명의 또 다른 목적은 면진동 진폭을 디스크 위상별로 파악하여 각 위상별로 포커싱을 세분하여 조절하는 방법에 제공하는 것이다. It is still another object of the present invention to provide a method of determining the surface vibration amplitude for each disk phase and subdividing and adjusting the focusing for each phase.
상기와 같은 목적을 달성하기 위한 본 발명에 따른 광디스크의 면진동 판별방법은, 광 기록매체의 원주상에서, 포커싱 동작을 수행할 지점을 일정간격으로 선정하고, 상기 선정된 각 위치에서 포커싱 동작을 수행하며, 상기 각 포커싱 동작의 시작부터 정확한 포커싱이 될 때까지의 포커싱 소요시간을 측정한 다음, 상기 측정된 각 포커싱 소요시간에 근거하여 상기 광 기록매체의 면진동 여부를 판별하는 것을 특징으로 한다.In accordance with an aspect of the present invention, there is provided a method for determining the surface vibration of an optical disc, wherein a point on which a focusing operation is to be performed is performed at a predetermined interval on a circumference of an optical recording medium, and the focusing operation is performed at each of the selected positions. And measuring the focusing time from the start of each focusing operation to the correct focusing, and then determining whether the optical recording medium is oscillated on the basis of the measured focusing time.
본 발명에 따른 또 다른 광디스크의 면진동 판별방법은, 회전하는 광 기록매체의 원주상의 위치를 확인하고, 상기 확인된 위치가, 기 지정된 원주상의 각 위치에 해당하면 그 위치에서의 면진동 크기를 각각 검출한 다음, 광 기록매체의 재생이 이루어지면, 상기 검출된 각 위치에서의 면진동 크기에 근거하여 현재 재생위치의 다음 위치에 맞도록 포커싱 서보의 특성을 조절하는 것을 특징으로 한다.According to another aspect of the present invention, there is provided a method for determining the surface vibration of an optical disk, wherein the position of the optical recording medium on the circumference is checked, and when the identified position corresponds to each position on the predetermined circumference, the surface vibration is performed at that position. After the respective sizes are detected, when the optical recording medium is reproduced, the characteristics of the focusing servo may be adjusted to match the next position of the current reproduction position based on the magnitude of the surface vibration at each detected position.
이하, 본 발명에 따른 광디스크의 면진동 판별방법에 대한 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다. Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the method for determining the surface vibration of an optical disk according to the present invention will be described in detail.
도 1은, 본 발명에 따른 광디스크의 면진동 판별방법이 적용되는 광디스크 장치에 대한 구성을 도시한 것이다. Fig. 1 shows a configuration of an optical disk apparatus to which the surface vibration discrimination method of the optical disk according to the present invention is applied.
도 1의 광디스크 장치는, 씨디 또는 디브이디 등과 같은 광디스크(10)에 기록된 신호를 독출하기 위한 광픽업(11); 상기 광픽업(11)에 의해 독출되는 RF 신호를 2 진 신호로 변환 출력함과 아울러, 상기 RF 신호로부터 포커싱 에러(FE: Focus Error) 신호와 트래킹 에러(TE: Tracking Error) 신호, 그리고 정확한 포커싱시점에 FOK(Focusing OK)신호를 출력하는 RF 부(12); 상기 RF 부(12)를 통해 변환 출력되는 2 진 신호를 신호처리하여 원래의 데이터로 복원하는 디지털 신호처리부(13); 상기 RF 부(12)에서 출력되는 포커싱 에러신호와 트래킹 에러신호에 근거하여, 상기 광픽업(11)에 구비된 대물렌즈(Object Lens)를 상하 좌우로 이동시키는 포커싱 동작과 트래킹 동작을 수행하는 서보부(14); 상기 서보부(14)의 제어에 의해, 상기 광디스크(10)를 회전시키기 위한 스핀들 모터(15); 상기 광픽업(11)을 광디스크상에서 수평 이동시키기 위한 슬레드 모터(16); 상기 스핀들 모터(15)와 슬레드 모터(16)를 구동시키기 위한 모터 구동부(17); 상기 스핀들 모터(15)의 회전시에, 펄스(pulse)신호( 이하, 'FG신호'라 함 )를 출력하는 FG 신호 발생부(19); 및 디스크의 구분된 각 위상에서의 포커싱 소요시간들에 근거하여, 디스크의 면진동 양을 판별하여 포커싱 서보를 제어하는 마이컴(18)을 포함하여 구성된다. 1 includes an optical pickup 11 for reading out a signal recorded on an optical disc 10 such as a CD or DVD; The RF signal read by the optical pickup 11 is converted into a binary signal, and outputs a focus error (FE) signal, a tracking error (TE) signal, and accurate focusing from the RF signal. An RF unit 12 for outputting a FOK (Focusing OK) signal at a time point; A digital signal processor (13) for signal-processing the binary signal converted through the RF unit (12) and restoring the original data; A servo that performs a focusing operation and a tracking operation for moving an object lens provided in the optical pickup 11 up, down, left, and right based on a focusing error signal and a tracking error signal output from the RF unit 12. Part 14; A spindle motor (15) for rotating the optical disc (10) under the control of the servo unit (14); A sled motor (16) for horizontally moving the optical pickup (11) on the optical disc; A motor driver 17 for driving the spindle motor 15 and the sled motor 16; An FG signal generator 19 for outputting a pulse signal (hereinafter referred to as an 'FG signal') when the spindle motor 15 rotates; And a microcomputer 18 for determining the amount of surface vibration of the disk and controlling the focusing servo based on the focusing time in each phase of the disc.
도 2는, 도 1의 장치에서 수행되는 본 발명에 따른 광디스크의 면진동 판별방법의 바람직한 일 실시예에 따른 동작 흐름도이다.FIG. 2 is an operation flowchart according to a preferred embodiment of the method for determining the surface vibration of an optical disk according to the present invention performed in the apparatus of FIG.
도 1과 같이 구성되는 광디스크 장치 내에 광디스크(10)가 삽입 안착되면, 상기 마이컴(18)은, 상기 서보부(14)를 동작 제어하여, 광디스크가 스핀들 모터(15)에 의해 회전되도록 하는(S10) 한편, 광픽업(11)에 구비된 대물렌즈가 광디스크상에 포커싱되도록 제어한다. 동시에 상기 FG신호 발생부(19)로부터 출력되는 FG신호의 펄스를 카운트한다(S11). 디스크 초기 회전속도는 저속으로 하며, 적어도 디스크의 1회전동안 3회이상의 포커싱이 반복적으로 이루어질 수 있는 정도의 속도가 바람직하다.When the optical disk 10 is inserted and seated in the optical disk device configured as shown in FIG. 1, the microcomputer 18 operates the servo unit 14 to control the optical disk to be rotated by the spindle motor 15 (S10). Meanwhile, the objective lens provided in the optical pickup 11 is controlled to focus on the optical disk. At the same time, the pulses of the FG signal output from the FG signal generator 19 are counted (S11). The initial rotational speed of the disc is set to a low speed, and a speed at which three or more times of focusing can be repeatedly performed during at least one rotation of the disc is preferable.
그리고, 상기 포커싱 시작부터, 포커싱이 완료되어 FOK신호가 상기 RF부(12)로부터 출력될 때(S12) 까지의 시간을 내부 타이머를 통하여 측정하여 저장한다(S13).Then, the time from the start of focusing to when the focus is completed and the FOK signal is output from the RF unit 12 (S12) is measured and stored through the internal timer (S13).
그리고, 디스크가 1회전 완료되었는 지를, 상기 FG신호 발생부(19)로부터 출력되는 펄스의 개수로부터 판단한다(S14). 만약, 상기 FG신호 발생부(19)가 디스크의 1회전동안 펄스를 6개 출력한다고 하면, 카운트된 펄스수가 6개인지를 체크한다.Then, it is judged from the number of pulses output from the FG signal generator 19 whether the disk has been completed one revolution (S14). If the FG signal generator 19 outputs six pulses during one revolution of the disc, it is checked whether the number of pulses counted is six.
6개가 아니면 아직 1회전이 되지 않았으므로 대물렌즈를 해당 포커싱위치로 되돌린 다음(S15), 포커싱 동작을 또 수행한다(S16). 포커싱 동작을 재개하는 시간간격은 디스크의 1회전에 소요되는 시간의 1/3로 한다. 즉, 1회전 주기를 T라 하면 재차 수행되는 포커싱 간격은 이전 수행시작부터 T/3 경과된 시간이 되는 것이다. 정해진 시간간격대신, FG신호의 펄스때마다 그 펄스의 개수를 확인하고, 그 개수가 1, 3, 5일 때 포커싱 동작을 수행할 수도 있다.If it is not six, since one rotation has not yet been made, the objective lens is returned to the corresponding focusing position (S15), and then the focusing operation is performed again (S16). The time interval for resuming the focusing operation is 1/3 of the time required for one revolution of the disc. That is, if one rotation period is T, the focusing interval that is performed again becomes the time elapsed T / 3 from the start of the previous execution. Instead of a predetermined time interval, the number of pulses may be checked for each pulse of the FG signal, and the focusing operation may be performed when the number is 1, 3, or 5.
포커싱을 재개한 후 FOK신호가 출력될 때(S12)까지의 시간을 다시 측정하여 저장하고(S13), 이와 같은 동작을 디스크가 1회전될 때까지 수행한다.After resuming focusing, the time until the FOK signal is output (S12) is measured and stored again (S13), and the above operation is performed until the disc is rotated once.
도 3은 위와 같은 과정이 수행될 때의 관련신호의 파형을 도시한 것이다.3 shows waveforms of related signals when the above process is performed.
디스크가 1회전되면(S14), 상기 마이컴(18)은 측정된 세개의 시간( 도 3의 T1,T2,T3 )의 편차를 구한다(S17). 이 편차의 크기가 곧 디스크의 면진동의 양이다.When the disk is rotated once (S14), the microcomputer 18 calculates the deviation of the measured three times (T1, T2, T3 in Fig. 3) (S17). The magnitude of this deviation is the amount of surface vibration of the disk.
상기 마이컴(18)은 구해진 면진동( 편차크기 )에 비례하여 상기 서보부(14)의 포커싱 서보게인을 높이거나, FE신호의 증폭을 키워서 포커싱 서보의 민감도를 높이거나 재생속도를 최고속도보다 낮은 속도로 설정하게 된다(S18). 이와 같이 하면, 기록데이터의 재생을 위해 고속( 또는 최고속도보다 낮은 속도 )으로 회전할 때 상하로 진동하는 디스크의 기록면과의 정확한 포커싱거리가 유지될 수 있도록 한다.The microcomputer 18 increases the focusing servo gain of the servo unit 14 in proportion to the obtained surface vibration (variation magnitude), increases the sensitivity of the focusing servo by increasing the amplification of the FE signal, or lowers the playback speed lower than the maximum speed. The speed is set (S18). In this way, it is possible to maintain an accurate focusing distance with the recording surface of the disk which vibrates up and down when rotating at a high speed (or a speed lower than the maximum speed) for reproduction of the recording data.
만약, 구해진 면진동( 편차크기 )의 양이 수용할 수 없는 정도의 크기이면 상기 마이컴(18)은 포커싱 서보를 조절하지 않고, 장착된 디스크(10)를 배출시킨다.If the obtained amount of surface vibration (deviation magnitude) is an unacceptable amount, the microcomputer 18 discharges the mounted disk 10 without adjusting the focusing servo.
도 2의 실시예는 디스크를 3등분하여 면진동양을 측정한 것이다. 면진동양의 측정은, 디스크의 위상을 보다 세분화하여 포커싱 완료시간의 편차를 계산하면 보다 정확한 면진동 양을 측정할 수 있다.In the embodiment of Fig. 2, the disk oscillation is measured in three parts. The measurement of the surface vibration amount can be more accurately measured by calculating the deviation of the focusing time by further subdividing the phase of the disk.
보다 많은 위상에서 포커싱 시간을 얻기 위해서는, 주어진 저속상태에서 포커싱에 소요되는 물리적인 시간을 단축시켜야 하나 이는 한계가 있다.To get focusing time in more phases, the physical time required for focusing at a given low speed must be shortened, but this is a limitation.
도 4는 많은 디스크 위상에서 포커싱 시간을 얻어서 디스크의 면진동을 측정하는 방법의 흐름도이다.4 is a flowchart of a method of measuring the surface vibration of a disc by obtaining the focusing time in many disc phases.
이 실시예에서는, 디스크의 1회전에 FG신호의 펄스가 8개 출력되는 것으로 가정한다. 그리고, 상기 마이컴(18)은 상기 FG신호의 펄스 입력시마다 수행되는 인터럽트 루틴(Interrupt Routine)을 갖는다.In this embodiment, it is assumed that eight pulses of the FG signal are output in one rotation of the disc. In addition, the microcomputer 18 has an interrupt routine performed every time a pulse input of the FG signal is performed.
이 인터럽트 루틴은 매 펄스 입력시마다 펄스수를 카운트하여(S20) 그 펄스수가 8n, 8(n+k)+1, 8(n+2*k)+2, 8(n+3*k)+3, 8(n+4*k)+4, 8(n+5*k)+5, 8(n+6*k)+6, 8(n+7*k)+7 일 때마다(S21) 차례대로 전술한 포커싱 동작수행과 그에 의해 획득된 포커싱 시간을 측정하여 저장한다(S22). 여기서, n은 임의의 수이며, k는 측정회전간격을 나타낸다. 즉, k를 1로 설정한 상태이면, 1회전 후에 다음 위상에서 측정되고, k가 2이면 디스크의 2회전후에 다음 위상에서 측정된다. 이와 같은 방법을 사용하면 각 위상에서의 포커싱 시간을 측정하기 위해 특별히 디스크를 저속으로 회전시키지 않아도 된다.This interrupt routine counts the number of pulses at every pulse input (S20) and the number of pulses is 8n, 8 (n + k) +1, 8 (n + 2 * k) +2, 8 (n + 3 * k) + Whenever 3, 8 (n + 4 * k) +4, 8 (n + 5 * k) +5, 8 (n + 6 * k) +6, 8 (n + 7 * k) +7 (S21 In step S22, the above-described focusing operation is performed and the focusing time obtained thereby is measured and stored. Where n is an arbitrary number and k represents a measurement rotation interval. That is, if k is set to 1, it is measured in the next phase after one revolution, and if k is 2, it is measured in the next phase after two revolutions of the disc. This approach eliminates the need to rotate the disk at a slow speed to measure the focusing time in each phase.
도 5는 k가 2일 때의 측정간격을 도식적으로 나타낸 것이다. 한번 측정되면 측정횟수를 증가시키고(S23), 그 측정횟수가 8회가 될 때까지(S24) 반복하여 측정한다.5 schematically shows the measurement interval when k is 2. Once measured, increase the number of measurements (S23), and measure repeatedly until the number of measurements is eight (S24).
정해진 횟수만큼, 측정되면 그 측정된 각 포커싱 시간의 편차를 구한다(S25). 이 편차가 곧 디스크의 면진동 양을 나타낸다. 구해진 면진동 양( 편차 )에 따라 디스크의 재생속도를 낮추거나 포커싱 서보의 민감도를 조절(S26)하거나 아니면 디스크를 배출시키고, FG펄스에 의한 인터럽트를 디세이블(disable)시킨다(S27).If a predetermined number of times is measured, the deviation of each measured focusing time is obtained (S25). This deviation is indicative of the amount of surface vibration of the disk. According to the obtained amount of surface vibration (variation), the speed of the disk is lowered, the sensitivity of the focusing servo is adjusted (S26) or the disk is ejected, and the interrupt by the FG pulse is disabled (S27).
포커싱 서보특성을 전체적으로 조절하는 대신 각 디스크 위상마다 개별적으로 적응시켜 조절할 수도 있다. 이를 위해서, 상기 마이컴(18)은, 전술한 실시예에서 측정된 각 포커싱 시간외에 그 것이 측정된 위상, 즉, 카운트된 펄스수를 '디스크 1회전시에 출력되는 FG신호의 펄스 수' ( 도 2의 실시예에서 6, 도 4의 실시예에서는 8 )로 나눈 나머지 값을 함께 기록한다.Instead of adjusting the focusing servo characteristics globally, they can be individually adapted and adjusted for each disc phase. To this end, the microcomputer 18, in addition to each focusing time measured in the above-described embodiment, displays the measured phase, that is, the number of pulses counted as 'the number of pulses of the FG signal outputted at one rotation of the disc' (FIG. In the embodiment 2, the remaining values divided by 6 and 8) in the embodiment of FIG. 4 are recorded together.
즉, 도 6과 같은 테이블을 구성한다. 그리고, 각 포커싱 시간의 평균(Tavg)을 구하고, 각 측정시간과 상기 평균값(Tavg)의 차이(602)를 구하여 기록한다.That is, the table shown in FIG. The average Tabg of each focusing time is obtained, and the difference 602 between each measurement time and the average value Tabg is obtained and recorded.
그리고, 데이터의 재생동작이 이루어지면, 상기 구해진 차이값에 따라 포커싱 서보의 게인을 각 위상마다 미리 예측하여 조절하게 된다.When the data reproduction operation is performed, the gain of the focusing servo is predicted and adjusted in advance for each phase according to the obtained difference value.
예를 들어, 상기 계산된 차이값(DTi)의 DTM 값이 가장 작다면, M위상에서M+1위상으로 넘어가기 전에 서보 게인을 조금 높여서 M+1위상에서의 면진동 크기에 대응하게 한다.For example, if the DT M value of the calculated difference value DTi is the smallest, the servo gain is slightly increased before moving from the M phase to the M + 1 phase to correspond to the surface vibration magnitude in the M + 1 phase. .
이상, 전술한 본 발명의 바람직한 실시예는, 예시의 목적을 위해 개시된 것으로, 당업자라면 이하 첨부된 특허청구범위에 개시된 본 발명의 기술적 사상과 그 기술적 범위 내에서, 다양한 다른 실시예들을 개량, 변경, 대체 또는 부가 등이 가능할 것이다. As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.
상기와 같이 이루어지는 본 발명에 따른 광디스크의 면진동 판별방법은, 면진동하는 광디스크에서 포커싱 실패없이 신호를 재생시킬 수가 있게 하며 또한 상하진동에 의해 재생이 불가능한 디스크에 대한 불필요한 재생시도를 하지 않게 한다. The surface vibration discriminating method of the optical disk according to the present invention as described above enables the signal to be reproduced without the focusing failure in the optical disk which is oscillating and prevents unnecessary playback attempts on the disk which cannot be reproduced by vertical vibration.
도 1은 본 발명에 따른 광디스크의 면진동 판별방법이 적용되는 광디스크 장치에 대한 구성을 도시한 것이고,1 shows a configuration of an optical disk apparatus to which the method for determining the vibration of the surface of the optical disk according to the present invention is applied.
도 2는 본 발명에 따른 광디스크의 면진동 판별방법의 일 실시예의 흐름을 도시한 것이고,Figure 2 shows the flow of an embodiment of the surface vibration determination method of the optical disk according to the present invention,
도 3은 면진동에 비례하여 포커싱 시간에 편차가 나타나는 예를 도시한 것이고,3 illustrates an example in which a deviation occurs in focusing time in proportion to surface vibration.
도 4는 본 발명에 따른 광디스크의 면진동 판별방법의 다른 실시예의 흐름을 도시한 것이고,Figure 4 shows the flow of another embodiment of the surface vibration determination method of the optical disk according to the present invention,
도 5는 도 4의 실시예에 따라 광디스크에 대해 포커싱을 수행하는 과정을 도시한 것이고,FIG. 5 illustrates a process of performing focusing on an optical disc according to the embodiment of FIG. 4.
도 6은 본 발명에 따라 광디스크의 각 위상에서 측정된 포커싱의 시간의 예를 도표화한 것이다.6 is a diagram of an example of the time of focusing measured at each phase of an optical disc in accordance with the present invention.
※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing
10 : 광디스크 11 : 광픽업10: optical disc 11: optical pickup
12 : RF 부 13 : 디지털 신호처리부12: RF unit 13: digital signal processing unit
14 : 서보부 15 : 스핀들 모터14: servo unit 15: spindle motor
16 : 슬레드 모터 17 : 모터 구동부16: sled motor 17: motor drive unit
18 : 마이컴 19 : FG 신호 발생부18: microcomputer 19: FG signal generator
Claims (22)
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| US10/216,226 US6912184B2 (en) | 2001-09-20 | 2002-08-12 | Method and apparatus of measuring axial vibration of a disk recording medium |
| CNB021427992A CN1314020C (en) | 2001-09-20 | 2002-09-18 | Method and device for measuring disc recording medium axle vibration method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02187933A (en) * | 1989-01-13 | 1990-07-24 | Hitachi Maxell Ltd | Inclination angle measuring method |
| JPH09293321A (en) * | 1996-04-26 | 1997-11-11 | Hitachi Ltd | Optical disk device |
| KR19980057721A (en) * | 1996-12-30 | 1998-09-25 | 김광호 | Optical disc reproducing apparatus for determining proper double speed according to disc deflection, and corresponding double speed determining method |
| JP2000348362A (en) * | 1999-05-19 | 2000-12-15 | Lg Electronics Inc | Device and method for compensating for tilt of optical recording medium |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02187933A (en) * | 1989-01-13 | 1990-07-24 | Hitachi Maxell Ltd | Inclination angle measuring method |
| JPH09293321A (en) * | 1996-04-26 | 1997-11-11 | Hitachi Ltd | Optical disk device |
| KR19980057721A (en) * | 1996-12-30 | 1998-09-25 | 김광호 | Optical disc reproducing apparatus for determining proper double speed according to disc deflection, and corresponding double speed determining method |
| JP2000348362A (en) * | 1999-05-19 | 2000-12-15 | Lg Electronics Inc | Device and method for compensating for tilt of optical recording medium |
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