KR100258586B1 - Focus bias controlling method of optical disk reproducing and recording device - Google Patents

Focus bias controlling method of optical disk reproducing and recording device Download PDF

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KR100258586B1
KR100258586B1 KR1019970024352A KR19970024352A KR100258586B1 KR 100258586 B1 KR100258586 B1 KR 100258586B1 KR 1019970024352 A KR1019970024352 A KR 1019970024352A KR 19970024352 A KR19970024352 A KR 19970024352A KR 100258586 B1 KR100258586 B1 KR 100258586B1
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focus
value
focus bias
error value
zero
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KR1019970024352A
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Korean (ko)
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KR19990001139A (en
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송봉훈
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윤종용
삼성전자주식회사
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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
    • 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
    • G11B20/10398—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: A method for adjusting a focus bias of an optical disk reproducing recording device is provided to set a focus bias value of an automatic focus mode by increasing or decreasing a focus bias value as a selected sampling section in order that an initial focus error value may be zero when an optical disk reproducing recording device is initially operated. CONSTITUTION: If a user turns on a power to an optical disk reproducing recording device(S110), a micro computer outputs a control signal and performs a focusing test for driving a laser through a light pickup unit(S120). It is judged whether a beam being reflected from a disk surface is existed(S130). If the beam is existed, a focus error value is read through a light detecting unit(S140). It is judged whether the read focus error value is zero(S210). If the read focus error value is zero, a focus bias value is set as a focus bias value of an automatic focus mode(S220). If the read focus error value is not zero, it is judged whether the focus error value is a positive number(S230). If the focus error value is a positive number, the focus bias value is increased as a -3.9mV(S240) corresponded to a sampling section, and it is judged whether the current focus bias value is zero(S210). If the focus error value is a negative number, the focus bias value is increased as a +3.9mV(S250) corresponded to a sampling section, and it is judged whether the current focus bias value is zero(S210).

Description

광디스크 재생기록장치의 포커스바이어스 조정방법How to adjust the focus bias of the optical disc recorder

본 발명은 광디스크 재생기록장치의 포커스바이어스 조정방법에 관한 것으로, 보다 상세하게는 광디스크 재생기록장치의 초기 구동시 초기 포커스 에러값이 제로가 될 수 있도록 설정된 샘플링 구간만큼 포커스바이어스 값을 증가 또는 감소시켜 자동포커스 모드의 포커스바이어스 값을 세팅하고자 하는 광디스크 재생기록 장치의 포커스바이어스 조정방법에 관한 것이다.The present invention relates to a method of adjusting a focus bias of an optical disc reproducing and recording apparatus. More specifically, the focus bias value is increased or decreased by a sampling period set so that an initial focus error value can be zero when the optical disc reproducing and recording apparatus is initially driven. A focus bias adjustment method of an optical disc reproducing and recording apparatus for setting a focus bias value in an autofocus mode.

일반적으로 CD, LD 및 VCD 등과 같은 광디스크는 음성이나 영상등의 데이터가 정해진 유효영역에 기록되고, 광디스크 재생장치를 이용하여 재생될 수 있도록 제작된 기억매체로서 견고할 뿐만 아니라 기록된 데이타는 쉽게 손상되지 않으며 광을 이용하여 잡음없이 깨끗하게 재생할 수 있는 장점이 있으므로 그 이용도가 점차로 증대되고 있다.In general, optical discs such as CDs, LDs, and VCDs are a storage medium that is designed so that data such as audio and video can be recorded in a defined effective area, and can be reproduced using an optical disc player. In addition, the utilization is gradually increasing because there is an advantage that can be reproduced cleanly without noise by using light.

그리고 재생기 광다이오드를 통해 발사되는 빔을 디스크에 정확하게 입사되도록 하여 디스크에 기록된 데이터를 재생하기 위해 대물렌즈와 디스크간의 초점을 정확히 조정해 주는 것이 바람직하다.In addition, it is desirable to precisely adjust the focus between the objective lens and the disc in order to reproduce the data recorded on the disc so that the beam emitted through the reproducer photodiode is accurately incident on the disc.

도 1은 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 개략 구성 블록도이다.1 is a schematic structural block diagram for adjusting the focus bias of an optical disc reproducing and recording apparatus.

도시한 바와 같이 대물렌즈(20)는 광픽업의 중앙에 있는 광학소자로서, 레이저 빔을 집속하여 디스크 (10) 표면에 표시하며, 이로 인해 발생되는 반사빔을 광픽업측으로 전달하는데, 포커싱 코일 (30)에 흐르는 전류량에 의해 대물렌즈(20)는 상하로 움직여 디스크(10)에 광빔의 초점이 맞도록 조정된다. 상기 대물렌즈(20)를 통한 반사빔은 이후 다른 광학소자등을 통해 광검출부(40)로 인가되는데, 이때 디스크(10)면에서 받사되는 광신호를 전기적 신호로 변환한다.As shown, the objective lens 20 is an optical element in the center of the optical pickup, focuses the laser beam and displays it on the surface of the disk 10, and transmits the reflected beam generated to the optical pickup side by focusing coil ( The objective lens 20 is moved up and down by the amount of current flowing through 30 so that the light beam is focused on the disk 10. The reflected beam through the objective lens 20 is then applied to the light detecting unit 40 through another optical element, etc. At this time, the optical signal received from the disk 10 surface is converted into an electrical signal.

상기 광검출부(40)는 A, B, C, D의 4개의 포토다이오드로 구성되어 있다.The photodetector 40 is composed of four photodiodes of A, B, C, and D.

이때 대물렌즈를 통한 레이저빔이 디스크(10)면에 정확하게 초점이 형성되면 반사되는 빔이 광검출부(40)에서 정확하게 원을 형성하는 빔이 검출되며, 이때 차동증폭부(50)의 출력은 (A+C)-(B+D)=0가 된다.At this time, if the laser beam through the objective lens is accurately focused on the surface of the disk 10, a beam in which the reflected beam accurately forms a circle in the photodetector 40 is detected, and the output of the differential amplifier 50 is ( A + C)-(B + D) = 0.

그러므로 상기 대물렌즈(20)와 디스크(10)의 거리가 너무 멀거나 가까워 초점이 맞지 않을시에는 광검출부(40)에 의해 타원형의 빔이 검출된다. 이때 차동증폭부(50)는 상기 광검출부(40)의 A, C 면 값에서 B, D 면의 값을 감산한 결과를 출력한다.Therefore, when the distance between the objective lens 20 and the disk 10 is too far or too close to focus, an elliptical beam is detected by the light detector 40. In this case, the differential amplifier 50 outputs the result of subtracting the values of the B and D planes from the A and C plane values of the photodetector 40.

그 출력값은 다음과 같다.The output is:

(A+C)-(B+D) = 0 : 초점이 맞은 상태(A + C)-(B + D) = 0: in focus

(A+C)-(B+D) = + : 디스크와 대물렌즈의 거리가 먼 상태(A + C)-(B + D) = +: The disc is far from the objective lens

(A+C)-(B+D) = - : 디스크와 대물렌즈의 거리가 가까운 상태(A + C)-(B + D) =-: The distance between the disk and the objective lens is close

이때 차동증폭부(50)의 출력값을 A/D변환부(60)를 통해 디지털 신호로 변환하면, 마이크로 컴퓨터는 디지털 신호에 응답하여 디스크(10)와 대물렌즈(20)의 거리가 너무 멀거나 가까워 초점이 맞지 않을 때 자동포커싱모드로 전환하여 초점을 맞춘다.In this case, when the output value of the differential amplifier 50 is converted into a digital signal through the A / D converter 60, the microcomputer responds to the digital signal or the distance between the disk 10 and the objective lens 20 is too long. When it is not close enough to focus, switch to auto focusing mode to focus.

도 2는 종래 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 동작흐름도이다.2 is an operation flowchart for adjusting the focus bias of the conventional optical disc reproducing and recording apparatus.

도시한 바와 같이, 포커스바이어스 샘플링 구간 및 횟수를 설정하여 메모리에 세팅(S100)하면, 마이크로 컴퓨터(70)는 포커싱구동부(80)를 제어하며, 포커싱구동부(80)는 포커싱 코일(30)에 인가되는 구동전류를 제어하여 대물렌즈(20)를 상하 이동되도록 하고, 이때 광검출부(40)를 통해 입력되는 포커스바이어스 값과 그에 해당되는 지터값을 리딩하여 메모리에 순차적으로 저장(S110)한다.As shown, when setting the focus bias sampling interval and the number of times in the memory (S100), the microcomputer 70 controls the focusing driver 80, the focusing driver 80 is applied to the focusing coil 30 By controlling the driving current, the objective lens 20 is moved up and down. At this time, the focus bias value and the jitter value input through the photodetector 40 are read and sequentially stored in the memory (S110).

그리고 리딩되는 포커스바이어스 값과 그에 해당되는 지터값을 저장한 후 메모리의 첫 번째 어드레스에 저장된 지터값을 제1 지터값으로 로드(S120)하고, 메모리의 두 번째 어드레스에 저장된 지터값을 제2 지터값으로 로드(S130)한다.After storing the read focus bias value and the corresponding jitter value, the jitter value stored in the first address of the memory is loaded as the first jitter value (S120), and the jitter value stored in the second address of the memory is second jitter. The value is loaded (S130).

그리고 제1 지터값이 제2 지터값보다 작은지의 여부를 판단(S140)하고, 그 판단결과 제1 지터값이 제2지터값보다 작은 경우 비교할 지터값이 있는지 판단 (S150)한다.In operation S140, it is determined whether the first jitter value is smaller than the second jitter value, and if the first jitter value is smaller than the second jitter value, it is determined whether there is a jitter value to be compared (S150).

그 판단결과, 비교할 지터값이 남아 있는 경우 메모리의 어드레스를 하나 증가(S160)하고, 증가된 어드레스에 저장된 지터값을 제2 지터값으로 로드(S170)한후 제1지터값과 비교하게 된다.As a result of the determination, when the jitter value to be compared remains, the memory address is increased by one (S160), the jitter value stored in the increased address is loaded as the second jitter value (S170), and then compared with the first jitter value.

또한, 제1지터값이 제2지터값보다 큰 경우 제1 지터값으로 제2 지터값을 로드(S180)한 후 제1, 제2 지터값을 비교하는 단계를 반복 수행하게 된다. 이때 더 이상 비교할 지터값이 없는 경우 최종적으로 제1 지터값에 해당되는 포커스바이어스 값을 자동포커스모드의 포커스바이어스 값으로 세팅하여 메모리에 저장(S190)한다.In addition, when the first jitter value is larger than the second jitter value, the step of loading the second jitter value with the first jitter value (S180) and then comparing the first and second jitter values is repeated. In this case, when there are no more jitter values to be compared, the focus bias value corresponding to the first jitter value is finally set as the focus bias value in the auto focus mode and stored in the memory (S190).

그리고, 자동포커스모드의 포커스바이어스 값을 세팅하는 또다른 방법은 전술한 방법인 모든 포커스바이어스 값에 대한 지터량을 측정하여 그 중의 최소 포인트를 포커스바이어스 값으로 하는 것이 아니라 지터값이 급격히 증가하는 +, - 포커스바이어스 값을 검출하여 그 중점을 최적의 포커스바이어스 값으로 세팅하는 것이다.In addition, another method of setting the focus bias value in the auto focus mode is to measure the jitter amount for all the focus bias values described above, and not to make the minimum point the focus bias value, but to increase the jitter value rapidly. ,-To detect the focus bias value and set its midpoint to the optimal focus bias value.

그러나, 전술한 방법으로 광디스크 재생기록장치의 포커스바이어스를 조정하는데 있어서 정밀도가 떨어질 뿐만 아니라 적정한 포커스바이어스 값을 추출하는데 많은 시간이 소요된다는 문제점이 있었다.However, there has been a problem in that the adjustment of the focus bias of the optical disc reproducing and recording apparatus by the above-described method not only decreases the precision but also takes a long time to extract an appropriate focus bias value.

따라서, 본 발명의 목적은 전술한 문제점을 해결할 수 있도록 광디스크 재생기록장치의 초기 구동시 초기 포커스 에러값이 제로가 될 수 있도록 설정된 샘플링 구간만큼 포커스바이어스 값을 증가 또는 감소시켜 자동포커스 모드의 포커스바이어스 값을 세팅하고자 하는 광디스크 재생기록장치를 제공함에 있다.Accordingly, an object of the present invention is to increase or decrease the focus bias value by the sampling interval set so that the initial focus error value becomes zero during the initial driving of the optical disc reproducing and recording apparatus so that the above-mentioned problem can be solved. There is provided an optical disc reproducing and recording apparatus for setting a value.

제1도는 종래 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 동작흐름도이고,1 is an operation flowchart for adjusting the focus bias of a conventional optical disc reproducing and recording apparatus.

제2도는 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 개략 구성 블록도.2 is a schematic structural block diagram for adjusting a focus bias of an optical disc reproducing and recording apparatus.

제3도는 본 발명에 따른 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 동작 흐름도.3 is an operation flowchart for adjusting the focus bias of the optical disc reproducing and recording apparatus according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 디스크 20 : 대물렌즈10 disc 20 object lens

30 : 포커싱 코일 40 : 광검출부30: focusing coil 40: photodetector

50 : 차동증폭부 60 : A/D변환부50: differential amplifier 60: A / D converter

70 : 마이크로 컴퓨터 80 : 포커싱구동부70: microcomputer 80: focusing drive unit

이와 같은 목적을 달성하기 위한 본 발명에 따른 광디스크재생장치에 있어서, 본 발명은 초기 포커스 에러값을 리딩하고, 리딩된 포커스 에러값이 제로가 되도록 샘플링구간만큼 포커스바이어스 값을 증가/감소하여 자동포커스모드의 포커스바이어스 값으로 세팅하는 것이다.In the optical disc reproducing apparatus according to the present invention for achieving the above object, the present invention reads the initial focus error value, and increases / decreases the focus bias value by the sampling period so that the read focus error value becomes zero. To set the mode's focus bias value.

이하, 첨부한 도면들을 참조하여 본 발명의 바람직한 실시예를 상세히 기술하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 장치도 첨부도면 도 1에 도시한 장치와 동일하며, 장치를 제어하는 마이크로 컴퓨터(70)이 프로그램만 변경된 것이므로 장치에 대한 설명은 전술했으므로 생략하기로 하고 마이크로 컴퓨터(70)의 자동포커스모드의 포커스바이어스 값을 세팅하는 프로그램은 첨부도면 도 3을 이용하여 설명한다.Apparatus according to the present invention is also the same as the apparatus shown in Figure 1, the microcomputer 70 for controlling the device is changed only the program, so the description of the device will be omitted because it has been described above and automatic of the microcomputer 70 A program for setting the focus bias value in the focus mode will be described with reference to FIG. 3.

도 3은 본 발명에 따른 광디스크 재생기록장치의 포커스바이어스를 조정하기 위한 동작 흐름도이다.3 is an operation flowchart for adjusting the focus bias of the optical disc reproducing and recording apparatus according to the present invention.

도시한 바와 같이 사용자가 광디스크 재생기록장치에 전원을 온(S110)되게 하면 마이크로 컴퓨터(70)는 광픽업부를 통해 레이저를 구동(S120)되도록 제어신호를 출력하여 포커싱 테스트를 수행할 수 있도록 한다.As shown in the figure, when the user turns on the power to the optical disc reproducing and recording apparatus (S110), the microcomputer 70 outputs a control signal to drive the laser through the optical pickup unit (S120) to perform a focusing test.

이때 디스크(10)표면으로부터 반사되는 빔이 존재하는지의 여부를 판단 (S130)하고, 그 판단결과 반사되는 빔이 존재하는 경우 광검출부(40)를 통해 포커스 에러값을 리딩(S140)한다.At this time, it is determined whether there is a beam reflected from the surface of the disk 10 (S130), and if there is a beam reflected as a result of the determination, the focus error value is read through the light detector 40 (S140).

이때 리딩한 포커스 에러값이 제로인지의 여부를 판단(S210)하고, 그 판단결과 포커스 에러값이 제로인 경우 포커스 에러값이 제로일 때 포커스바이어스 값을 자동포커스모드의 포커스바이어스 값으로 세팅(S220)한 후 종료한다.At this time, it is determined whether or not the read focus error value is zero (S210). If the focus error value is zero as a result of the determination, the focus bias value is set to the focus bias value in the autofocus mode when the focus error value is zero (S220). Then exit.

전술한 포커스 에러값이 제료가 아닌 경우 포커스 에러값이 +인지의 여부를 판단(S230)하고, 그 판단결과 포커스 에러값이 +인 경우 포커스바이어스 값을 샘플 링구간인 -3.9mV만큼 증가(S240)한 후 그때의 포커스 에러값이 제로인지의 여부를 판단(S210)단계부터 재수행한다.If the above-mentioned focus error value is not a material, it is determined whether the focus error value is + (S230). If the focus error value is +, the focus bias value is increased by -3.9mV, which is a sampling period (S240). After that, it is determined again whether or not the focus error value is zero at step S210.

또한 포커스 에러값이 - 인 경우 포커스바이어스 값을 샘플링구간 +3.9mV만큼 증가(S250)한 후 그때의 포커스 에러값이 제로인지의 여부를 판단(S210)단계부터 재수행한다. 그러므로 포커스 에러값이 제로일 때 포커스바이어스 값을 자동포커스모드의 포커스바이어스 값으로 세팅(S220)하게 된다.If the focus error value is-, the focus bias value is increased by +3.9 mV in the sampling period (S250), and then it is determined whether or not the focus error value is zero at the time (S210). Therefore, when the focus error value is zero, the focus bias value is set to the focus bias value in the autofocus mode (S220).

상술한 바와 같이 본 발명은 광디스크 재생기록장치의 포커스바이어스를 조정하는데 있어, 정밀도를 향상시켜 디스크와 대물렌즈간의 초점을 빠른시간내에 정확하게 조정할 수 있다는 효과를 제공한다.As described above, the present invention provides an effect that the focus bias between the disc and the objective lens can be accurately adjusted in a short time by adjusting the focus bias of the optical disc reproducing and recording device.

Claims (2)

포커스 바이어스 값의 기준범위를 설정하고, 전원 및 레이저를 온되게 한 후 디스크면으로부터 반사되는 빔이 존재하는 경우 상기 빔을 이용하여 포커스를 조정하는 광디스크 재생기록장치의 포커스 바이어스 조정방법에 있어서, (1) 포커스 에러값을 리딩하는 단계; (2) 상기 리딩된 포커스 에러값이 제로인지의 여부를 판단하는 단계; (3) 상기 포커스 에러값이 제로인 경우 포커스 에러값이 제로일 때 포커스 바이어스 값을 자동포커스모드의 포커스 바이어스 값으로 세팅하는 단계; (4) 상기 단계(1)에서 리딩한 포커스 에러값이 +인지의 여부를 판단하는 단계; (5) 상기 단계(4)의 포커스 에러값이 +인 경우 그때의 포커스 바이어스 값에 미리 설정된 값만큼 감산시킨 후 포커스 에러값이 제로인지를 판단하는 단계; 및 (6) 상기 단계(4)의 포커스 에러값이 -인 경우 그때의 포커스 바이어스 값에 미리 설정된 값만큼 가산시킨 후 포커스 에러값이 제로인지를 판단하는 단계로 이루어짐을 특징으로 하는 광디스크 재생기록장치의 포커스바이어스 조정방법.In the focus bias adjustment method of an optical disc reproducing and recording apparatus for setting a reference range of a focus bias value, and adjusting a focus using the beam when there is a beam reflected from the disk surface after turning on the power supply and the laser, 1) reading the focus error value; (2) determining whether the read focus error value is zero; (3) setting the focus bias value to the focus bias value in the autofocus mode when the focus error value is zero when the focus error value is zero; (4) determining whether the focus error value read in step (1) is +; (5) subtracting the focus bias value at that time by a preset value when the focus error value of step (4) is + and determining whether the focus error value is zero; And (6) if the focus error value of step (4) is-, adding the focus bias value at that time by a predetermined value, and determining whether the focus error value is zero. How to adjust the focus bias. 제1항에 있어서, 상기 미리 설정된 값은, 3.9mV임을 특징으로 하는 광디스크 재생기록장치의 포커스바이어스 조정방법.The method as claimed in claim 1, wherein the preset value is 3.9 mV.
KR1019970024352A 1997-06-12 1997-06-12 Focus bias controlling method of optical disk reproducing and recording device KR100258586B1 (en)

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Publication number Priority date Publication date Assignee Title
KR970017273A (en) * 1995-09-30 1997-04-30 배순훈 Focus control device of optical disc player

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970017273A (en) * 1995-09-30 1997-04-30 배순훈 Focus control device of optical disc player

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