KR970003701Y1 - Automatic rf level control apparatus for optical disc system - Google Patents
Automatic rf level control apparatus for optical disc system Download PDFInfo
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- KR970003701Y1 KR970003701Y1 KR92028568U KR920028568U KR970003701Y1 KR 970003701 Y1 KR970003701 Y1 KR 970003701Y1 KR 92028568 U KR92028568 U KR 92028568U KR 920028568 U KR920028568 U KR 920028568U KR 970003701 Y1 KR970003701 Y1 KR 970003701Y1
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- motor
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- signal output
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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
-
- 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
- G11B20/02—Analogue recording or reproducing
- G11B20/04—Direct recording or reproducing
-
- 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
내용없음.None.
Description
제1도는 본 고안에 의한 광디스크시스템 알에프(RF) 신호레벨 자동조정장치의 일실시예에 따른 블럭도.1 is a block diagram according to an embodiment of an optical disk system RF signal level automatic adjustment device according to the present invention;
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 디스크 20 : 픽업수단10: disc 20: pickup means
30 : RF 신호증폭수단 40 : 비교수단30: RF signal amplification means 40: comparison means
50 : 모터구동수단 60 : 모터50: motor driving means 60: motor
본 고안은 광디스크시스템에 관한 것으로서, 특히 인가되는 레이저 출력의 변도에 따라 가변되는 RF 신호의 레벨을 자동으로 조정하기 위한 RF 신호레벨 자동조정장치에 관한 것이다.The present invention relates to an optical disk system, and more particularly, to an RF signal level automatic adjustment device for automatically adjusting the level of the RF signal that is varied according to the variation of the applied laser output.
일반적으로 광디스크시스템은 임의의 신호를 디지털 형태로 디스크상에 기록한 후 레이저 빔과 같은 고집광력을 가진 빛을 디스크 표면에 투사한 후 반사되는 빛을 수광하여 광량의 차이에 따라서 신호를 재생하는 장치이다.In general, an optical disk system is a device that records an arbitrary signal on a disk in digital form, projects light having a high condensing power such as a laser beam onto the disk surface, and then receives the reflected light to reproduce the signal according to the difference in the amount of light. .
이와 같은 광디스크시스템에서 신호를 재생하기 위해서는 여러가지 서보회로가 존재하는데, 그 중 대표적인 것으로 레이저 출력 안정화 서보, 포커싱(focusing) 서보, 트랙킹(tracking) 서보, 회전(CLV) 서보와 광학계 송출 서보 등이 있다. 여기서, 레이저 출력 안정화 서보는 투사되는 광량에 대하여 항상 안정된 레이저 출력을 얻기 위한 것이고, 포커싱(focusing) 서보는 레이저 빔이 디스크상에 최적의 초점을 맺도록 하기 위한 것이고, 트랙킹(tracking) 서보는 디스크회전에 따른 트랙변동량을 추적하기 위한 것이고, 회전(CLV) 서보는 디스크의 회전변동에 따른 데이터의 시간값을 보상하기 위한 것이다.There are various servo circuits for reproducing signals in such an optical disc system. Among them, laser output stabilization servo, focusing servo, tracking servo, rotation servo (CLV) servo, and optical transmission servo are present. . Here, the laser output stabilization servo is always to obtain a stable laser output for the amount of light to be projected, the focusing servo is to ensure that the laser beam to focus on the disk, the tracking servo is the disk The purpose of the present invention is to track the amount of track variation due to rotation, and the rotation (CLV) servo is to compensate the time value of data according to the rotation variation of the disk.
여기서 레이저 출력 안정화 서보는 디스크의 반사량에 따라서 포토 다이오드에 발생하는 전류의 크기를 증감보상해 줌으로써 디스크로부터 출력되는 RF 신호레벨을 동일하게 유지시켜 준다.The laser output stabilization servo maintains the same RF signal level output from the disk by increasing or decreasing the amount of current generated in the photodiode according to the reflection of the disk.
그러나 종래에는 포토 다이오드에 발생하는 전류의 크기를 사람이 조정하는 수동가변소자를 이용하여 증감보상해 줌으로써 사용하는데 불편한 문제점이 있었다.However, in the related art, there is a problem in that it is inconvenient to use by increasing or decreasing compensation using a passive variable element that a person adjusts the amount of current generated in the photodiode.
따라서 본 고안의 목적은 상기 문제점을 해결하기 위하여 광디스크시스템에 있어서 DC 모터를 이용하여 자동으로 RF 신호의 레벨을 조정하기 위한 RF 신호레벨 자동조정장치를 제공하는데 있다.Accordingly, an object of the present invention is to provide an RF signal level automatic adjustment device for automatically adjusting the level of the RF signal using a DC motor in the optical disk system to solve the above problems.
상기 목적을 달성하기 위하여 본 고안은 디스크에 실려있는 정보를 픽업하기 위한 픽업수단을 구비한 광디스크시스템의 RF 신호레벨 자동조정장치에 있어서; 상기 픽업수단으로부터 출력되는 RF 신호를 증폭하기 위한 RF 신호증폭수단; 상기 RF 신호증폭수단으로부터 출력되는 RF 신호를 미리 설정해 준 기준값과 비교하기 위한 비교수단; 상기 비교수단으로부터 출력되는 신호에 의해 회전방향이 교번적으로 제어되면서 상기 픽업수단에 부착되어 있는 가변소자를 가변시켜 상기 RF 신호레벨을 자동조정하기 위한 모터를 포함함을 특징으로 한다.In order to achieve the above object, the present invention provides an apparatus for automatically adjusting the RF signal level of an optical disk system having a pickup means for picking up information on a disk; RF signal amplifying means for amplifying the RF signal output from the pickup means; Comparison means for comparing the RF signal output from the RF signal amplifying means with a reference value preset; And a motor for automatically adjusting the RF signal level by varying the variable element attached to the pickup means while the rotation direction is alternately controlled by the signal output from the comparing means.
이하 첨부된 도면을 참조하여 본 고안에 대하여 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 고안에 의한 광디스크시스템의 RF 신호레벨 자동조정장치의 일실시예에 따른 블럭도이다.1 is a block diagram according to an embodiment of an RF signal level automatic adjustment apparatus of an optical disk system according to the present invention.
제1도는 도시된 블럭도의 구성은, 디스크(10)에 실려있는 정보를 픽업하기 위한 픽업수단(20)과, 픽업수단(20)에서 출력되는 RF 신호를 증폭하기 위한 RF 신호증폭수단(30)과, RF 신호증폭수단(30)에서 출력되는 RF 신호를 미리 설정해 준 RF 신호 기준값과 비교하기 위한 비교수단(30)과, 비교수단(30)에서 출력되는 신호를 증폭하여 전류를 공급하기 위한 모터구동수단(40)과, 모터구동수단(40)에서 출력되는 신호에 의해 회전방향이 교번적으로 제어되면서 픽업수단(20)에 부착되어 있는 가변소자를 가변시키기 위한 모터(50)로 이루어진다.FIG. 1 is a block diagram showing the configuration of the pickup means 20 for picking up information carried on the disk 10, and the RF signal amplification means 30 for amplifying the RF signal output from the pickup means 20. And a comparison means 30 for comparing the RF signal output from the RF signal amplification means 30 with a preset RF signal reference value, and amplifying the signal output from the comparison means 30 to supply a current. The motor driving means 40 and the motor 50 for varying the variable element attached to the pickup means 20 while the rotation direction is alternately controlled by the signal output from the motor driving means 40.
또한 비교수단(40)은 반전 입력단자(-)에는 RF 신호증폭수단(30)에서 출력되는 RF 신호가 저항(R1)을 통해 인가되고, 비반전 입력단자(+)에는 가변저항(VR1)가 접속된 제1증폭기(AMP1)와, 제1증폭기(AMP1)의 반전 입력단자(-)와 출력단자 사이에 접속된 저항(R2)으로 구성되고, 모터구동수단(50)은 반전 입력단자(-)에는 비교수단(30)에서 출력되는 신호가 저항(R3)을 통해 인가되고, 비반전 입력단자(+)에는 접지가 접속된 제2증폭기(AMP2)와 베이스 단자에는 제2증폭기(AMP2)의 출력단자가 접속되고, 콜렉터단자에는 정전압전원(+V)이 접속된 NPN 트랜지스터(Q1)와, 베이스단자에는 NPN 트랜지스터(Q1)의 베이스단자가 접속되고, 콜렉터단자에는 역전압전원(-V)이 접속되고, 에미터단자는 NPN 트랜지스터(Q1)의 에미터단자가 접속된 PNP 트랜지스터(Q2)와, 제2증폭기(AMP2)의 제2증폭 반전 입력단자(-)와 NPN 트랜지스터(Q1)의 에미터단자와 PNP 트랜지스터(Q2)의 에미터단자 사이의 접속점 사이에 접속된 저항(R4)으로 구성된다.In addition, the comparison means 40 has an RF signal output from the RF signal amplifying means 30 applied to the inverting input terminal (-) through a resistor R1, and a variable resistor VR1 is provided to the non-inverting input terminal (+). And a resistor R2 connected between the first amplifier AMP1 connected and the inverting input terminal (-) of the first amplifier AMP1 and the output terminal, and the motor driving means 50 includes the inverting input terminal (-). ) Is applied to the signal output from the comparison means 30 through the resistor (R3), the non-inverting input terminal (+) of the second amplifier (AMP2) connected to the ground and the base terminal of the second amplifier (AMP2) The output terminal is connected, the collector terminal is connected to the NPN transistor Q1 connected with the constant voltage power supply (+ V), the base terminal is connected to the base terminal of the NPN transistor Q1, and the collector terminal is connected to the reverse voltage power supply (-V). The emitter terminal is connected to the PNP transistor Q2 to which the emitter terminal of the NPN transistor Q1 is connected, and the second amplifier half of the second amplifier AMP2. The resistor R4 is connected between the input terminal (−) and the connection point between the emitter terminal of the NPN transistor Q1 and the emitter terminal of the PNP transistor Q2.
그러면 본 고안의 동작을 제1도를 참조하여 설명하기로 한다.Then, the operation of the present invention will be described with reference to FIG.
픽업수단(20)은 디스크(10)에 실려있는 정보를 픽업하고, RF 신호증폭수단(30)은 픽업수단(20)에서 출력되는 RF 신호를 증폭시킨다. 여기서는 레이저 출력 안정화 서보회로가 픽업수단(20)에 포함되어 있다고 생각한다.The pickup means 20 picks up the information carried on the disk 10, and the RF signal amplification means 30 amplifies the RF signal output from the pickup means 20. It is assumed here that the laser output stabilization servo circuit is included in the pickup means 20.
비교수단(40)은 RF 신호증폭수단(30)에서 출력되는 RF 신호와 미리 설정해 둔 RF 신호기준값을 비교, 증폭하여 모터구동수단(50)으로 출력한다.The comparison means 40 compares and amplifies the RF signal output from the RF signal amplification means 30 with a preset RF signal reference value and outputs the result to the motor driving means 50.
모터구동수단(50)은 비교수단(40)에서 출력되는 신호가 '하이레벨상태'의 신호이면 NPN 트랜지스터(Q1)가 온 상태가 되어 정전압전원(+V)에 의한 전류가 모터(60)로 인가되고, 비교수단(40)에서 출력되는 신호가 '로우레벨상태'의 신호이면 PNP 트랜지스터(Q2)가 온 상태가 되어 역전압전원(-V)에 의한 전류가 모터(60)로 인가되어 모터(60)가 교번적으로 회전하게 된다. 이때 모터(60)의 축에 접속된 픽업수단(20)의 가변소자를 회전시키게 되어 RF 신호증폭수단(30)에서 출력되는 RF 신호와 비교수단(40)에서 설정되어 있는 RF 신호 기준값이 동일하게 될 때까지 반복하게 된다.In the motor driving means 50, when the signal output from the comparing means 40 is the signal of the 'high level state', the NPN transistor Q1 is turned on so that the current by the constant voltage power supply (+ V) is transferred to the motor 60. When the signal output from the comparing means 40 is the signal of the 'low level state', the PNP transistor Q2 is turned on so that the current from the reverse voltage power source (-V) is applied to the motor 60 to supply the motor. 60 will rotate alternately. At this time, the variable element of the pickup means 20 connected to the shaft of the motor 60 is rotated so that the RF signal output from the RF signal amplifying means 30 and the RF signal reference value set by the comparing means 40 are equal. Repeat until
여기서 NPN 트랜지스터(Q1)와 PNP 트랜지스터(Q2)는 푸시풀 증폭회로로 구성되어 있다.Here, the NPN transistor Q1 and the PNP transistor Q2 are constituted by a push pull amplifier circuit.
상술한 바와 같이 본 고안에 의한 RF 신호레벨 자동조정장치에서는 간단한 회로구성으로서 RF 신호의 레벨을 자동으로 조정하므로써 수동조작시 불편함을 제거했을뿐 아니라 픽업장치의 생산성을 높이는 이점이 있다.As described above, in the RF signal level automatic adjustment device according to the present invention, the automatic adjustment of the RF signal level is a simple circuit configuration, which eliminates inconvenience in manual operation and increases the productivity of the pickup device.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92028568U KR970003701Y1 (en) | 1992-12-31 | 1992-12-31 | Automatic rf level control apparatus for optical disc system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92028568U KR970003701Y1 (en) | 1992-12-31 | 1992-12-31 | Automatic rf level control apparatus for optical disc system |
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| Publication Number | Publication Date |
|---|---|
| KR940017303U KR940017303U (en) | 1994-07-28 |
| KR970003701Y1 true KR970003701Y1 (en) | 1997-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR92028568U KR970003701Y1 (en) | 1992-12-31 | 1992-12-31 | Automatic rf level control apparatus for optical disc system |
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| KR (1) | KR970003701Y1 (en) |
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- 1992-12-31 KR KR92028568U patent/KR970003701Y1/en not_active IP Right Cessation
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| KR940017303U (en) | 1994-07-28 |
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