KR20030089941A - Objective lens driving apparatus for optical pickup - Google Patents
Objective lens driving apparatus for optical pickup Download PDFInfo
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- KR20030089941A KR20030089941A KR1020020027869A KR20020027869A KR20030089941A KR 20030089941 A KR20030089941 A KR 20030089941A KR 1020020027869 A KR1020020027869 A KR 1020020027869A KR 20020027869 A KR20020027869 A KR 20020027869A KR 20030089941 A KR20030089941 A KR 20030089941A
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- tilt
- objective lens
- tracking
- blade
- focus
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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
- 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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
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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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0932—Details of sprung supports
-
- 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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0935—Details of the moving parts
-
- 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
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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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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
본 발명은 광픽업의 대물렌즈 구동장치에 관한 것으로서, 특히 픽업과 디스크 기록면 간의 틸트를 동적으로 제어하는 기능을 구비한 광픽업의 대물렌즈 구동장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving apparatus for optical pickup, and more particularly, to an objective lens driving apparatus for optical pickup having a function of dynamically controlling the tilt between the pickup and the disc recording surface.
일반적으로 디스크 드라이브는 기록매체인 디스크에 광을 조사하여 정보를 기록하거나 또는 그로부터 정보를 읽어들여 재생하는 장치로서, 이를 위해 통상 디스크가 안착되는 턴테이블과, 턴테이블을 회전시키는 스핀들모터 및, 그 디스크의 기록면에 광을 조사하며 기록재생작업을 수행하기 위한 광픽업 등을 구비한다.In general, a disk drive is a device for recording or reading information by irradiating light onto a disk, which is a recording medium, and for this purpose, a turntable on which a disk is mounted, a spindle motor for rotating the turntable, and a disk of the disk. And an optical pickup for irradiating light onto the recording surface and performing a recording / reproducing operation.
그런데, 광픽업에서 출사된 광은 디스크의 기록면에 수직으로 입사되어야만 정확한 초점의 광스폿을 형성할 수 있게 된다. 만일, 광의 입사방향이 틀어지게 되면 디스크에 정확한 광스폿을 형성할 수 없게 되고, 그렇게 되면 데이터의 기록하고 재생하는데 있어서 에러가 발생할 수 있게 된다. 따라서 광스폿이 원하는 트랙상에 정확하게 형성되도록 하기 위해서는 상기 디스크의 기록면에 광이 수직으로 입사되도록 해야 한다. 이와 같이 디스크 기록면에 대한 광의 수직 입사를 조정하는 것을 틸트(tilt) 조정 또는 스큐(skew) 조정이라고도 한다. 물론, 통상적으로 광픽업에는 디스크 기록면의 원하는 트랙에 광의 초점이 잘 맺힐 수 있도록 대물렌즈의 위치를 포커스 방향과 트래킹 방향으로 제어하는 대물렌즈 구동장치가 구비되어 있다. 그러나, 이것은 대물렌즈와 디스크 기록면 간의 거리를 일정하게 맞춰서 광스폿의 초점을 유지하고 광스폿이 원하는 트랙을 추종하도록 제어하는 것으로, 디스크 기록면과 광의 입사각을 직접 제어할 수 있는 것은 아니다.However, the light emitted from the optical pickup must be incident perpendicularly to the recording surface of the disc to form the optical spot of the correct focus. If the direction of incidence of light is misaligned, an accurate light spot cannot be formed on the disc, and an error may occur in recording and reproducing data. Therefore, in order for the light spot to be formed accurately on the desired track, the light must be vertically incident on the recording surface of the disc. Adjusting the vertical incidence of light on the disk recording surface in this manner is also referred to as tilt adjustment or skew adjustment. Of course, the optical pickup is typically provided with an objective lens driving device which controls the position of the objective lens in the focusing direction and the tracking direction so that light can be focused on a desired track of the disc recording surface. However, this controls the distance between the objective lens and the disc recording surface to maintain the focus of the light spot and controls the light spot to follow the desired track, and does not directly control the incidence angle of the disc recording surface and the light.
따라서, 보다 정밀한 기록과 재생작업을 위해서는 이러한 틸트도 동적으로 조정할 수 있는 기능이 필요하게 된다.Thus, for more precise recording and reproducing operations, such a tilt function needs to be dynamically adjusted.
본 발명은 상기의 필요성을 감안하여 창출된 것으로서, 틸트 제어를 동적으로 구현할 수 있도록 개선된 광픽업의 틸트 조정장치를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above necessity, and an object thereof is to provide a tilt control apparatus for an optical pickup that can be improved to implement tilt control dynamically.
도 1은 본 발명에 따른 대물렌즈 구동장치를 보인 도면,1 is a view showing an objective lens driving apparatus according to the present invention,
도 2는 도 1에 도시된 대물렌즈 구동장치의 분리사시도,2 is an exploded perspective view of the objective lens driving device shown in FIG. 1;
도 3은 도 1에 도시된 대물렌즈 구동장치 중 틸트기구의 배치관계를 보인 도면,3 is a view showing an arrangement relationship of the tilt mechanism of the objective lens driving device shown in FIG.
도 4는 도 1에 도시된 대물렌즈 구동장치의 포커스기구에 의한 포커스방향 구동을 예시한 도면,4 is a view illustrating a focus direction driving by a focus mechanism of the objective lens driving device shown in FIG. 1;
도 5는 도 1에 도시된 대물렌즈 구동장치의 트래킹기구에 의한 트래킹방향 구동을 예시한 도면,5 is a diagram illustrating a tracking direction drive by a tracking mechanism of the objective lens driving device shown in FIG. 1;
도 6은 도 1에 도시된 대물렌즈 구동장치의 틸트기구에 의한 틸트방향 구동을 예시한 도면.FIG. 6 is a diagram illustrating tilt direction driving by a tilt mechanism of the objective lens driving device shown in FIG. 1; FIG.
< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>
10...베이스 20...홀더10 ... base 20 ... holder
30...포커스코일 40...트래킹코일30 ... Fokker coil 40 ... Tracking coil
50...틸트코일 61,62,51...제1,2,3마그넷50, tilt coil 61, 62, 51 ... 1, 2, 3 magnet
70...대물렌즈 80...블레이드70 ... objective lens 80 ... blade
90...와이어90 ... wire
상기 목적을 달성하기 위한 본 발명은, 대물렌즈가 탑재된 블레이드를 베이스에 대해 포커스방향으로 구동시키는 포커스기구와, 상기 블레이드를 트래킹방향으로 구동시키는 트래킹기구 및,상기 포커스기구 및 트래킹기구와 이격 배치되어 블레이드를 틸트방향으로 구동시키는 틸트기구를 포함하는 것을 특징으로 한다.The present invention for achieving the above object, a focus mechanism for driving the blade mounted on the objective lens in the focusing direction with respect to the base, a tracking mechanism for driving the blade in the tracking direction, spaced apart from the focus mechanism and tracking mechanism It characterized in that it comprises a tilt mechanism for driving the blade in the tilt direction.
여기서, 상기 포커스기구는 상기 베이스 상에 마주하며 설치된 제1,2마그넷과 상기 제1마그넷을 감싸도록 상기 블레이드에 내측에 설치된 포커스코일을 포함하고, 상기 트래킹기구는 상기 제1,2마그넷 사이에 위치되도록 상기 포커스코일에 설치된 트래킹코일을 포함하며, 상기 틸트기구는 상기 블레이드의 상기 제2마그넷 측 외측면에 설치된 틸트코일과 상기 틸트코일과 마주하여 틸트방향의 전자기력을 발생시키도록 상기 베이스에 설치된 제3마그넷을 포함하여 구성되는 것이 바람직하다.The focus mechanism includes first and second magnets facing each other on the base and a focus coil installed inside the blade to surround the first magnet, and the tracking mechanism is disposed between the first and second magnets. And a tracking coil installed on the focus coil to be positioned, wherein the tilt mechanism is installed on the base to face the tilt coil installed on the outer side of the second magnet side of the blade and the tilt coil to generate an electromagnetic force in the tilt direction. It is preferable to comprise a 3rd magnet.
이하, 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1 및 도 2는 본 발명에 따른 광픽업의 대물렌즈 구동장치를 나타낸다.1 and 2 show an objective lens driving apparatus of an optical pickup according to the present invention.
도면을 참조하면, 베이스(10) 상에 홀더(20)가 마련되어 있고, 대물렌즈(70)를 탑재한 블레이드(80)가 복수의 와이어(90)에 의해 이 홀더(20)에 유동가능하게 지지되어 있다. 그리고, 상기 대물렌즈(70)를 포커스방향(A)으로 구동시키는 포커스기구와 트래킹방향(B)으로 구동시키는 트래킹기구가 구비된다.Referring to the drawings, a holder 20 is provided on the base 10, and the blade 80 on which the objective lens 70 is mounted is supported by the plurality of wires 90 so as to be movable to the holder 20. It is. A focus mechanism for driving the objective lens 70 in the focus direction A and a tracking mechanism for driving the objective lens 70 in the tracking direction B are provided.
먼저, 상기 포커스기구는 베이스(10) 상에서 상호 마주보며 설치된 제1,2마그넷(61)(62)과 제1마그넷(61)을 감싸며 블레이드(80) 내측에 설치된 포커스코일(30)을 포함한다. 따라서, 포커스코일(30)에 흐르는 전류와 제1,2마그넷(61)(62)에 의한 자기력선의 상호 작용으로 블레이드(80)를 포커스방향(A)으로 구동시키는 전자기력을 발생시킨다.First, the focus mechanism includes first and second magnets 61 and 62 and the first and second magnets 61 and 62 installed facing each other on the base 10 and include a focus coil 30 installed inside the blade 80. . Therefore, the electromagnetic force for driving the blade 80 in the focus direction A is generated by the interaction of the current flowing through the focus coil 30 and the magnetic force lines by the first and second magnets 61 and 62.
상기 트래킹기구는 상기 제1,2마그넷(61)(62) 사이에 위치되도록 상기 포커스코일(30)의 일측에 부착된 트래킹코일(40)을 포함한다. 따라서, 이 트래킹코일(40)에 흐르는 전류와 상기 제1,2마그넷(61)(62)의 자기력선의 상호 작용에 의한 전자기력으로 트래킹방향(B)에 대한 블레이드(80)의 구동이 수행된다.The tracking mechanism includes a tracking coil 40 attached to one side of the focus coil 30 to be positioned between the first and second magnets 61 and 62. Therefore, the driving of the blade 80 in the tracking direction B is performed by the electromagnetic force caused by the interaction between the current flowing through the tracking coil 40 and the magnetic force lines of the first and second magnets 61 and 62.
또한, 본 발명의 대물렌즈 구동장치는 이러한 포커스 및 트래킹기구 외에 그들과 이격된 틸트기구를 별도로 구비하고 있다.In addition, the objective lens driving apparatus of the present invention is provided with a tilt mechanism spaced apart from them in addition to the focus and tracking mechanism.
상기 틸트기구는 상기 블레이드(80)의 제2마그넷(62)측 외측면(81)에 설치된한 쌍의 틸트코일(50)과, 상기 틸트코일(50)과 마주하도록 베이스(10)에 설치된 제3마그넷(51)을 포함하여 구성된다. 상기 틸트코일(50)은 도 3과 같이 그 하단부가 제3마그넷(51)과 마주하게 되며, 제3마그넷(51)은 N,S극으로 분극되어 있어서 각 극이 한 쌍의 틸트코일(50) 중 하나씩에 대응하게 된다. 따라서, 상기 틸트코일(50)에 흐르는 전류와 상기 제3마그넷(51)에 의한 자기력선과의 상호 작용으로 블레이드(80)를 틸트방향(C)으로 구동시키는 전자기력이 발생된다. 여기서, 상기 틸트기구를 상기 포커스기구 및 트래킹기구와 이격시키는 것은, 틸트기구의 추가에 의해 포커스기구와 트래킹기구가 가급적 영향을 받지 않도록 하기 위해서이다. 즉, 도 1에서 볼 때 포커스코일(30)과 트래킹코일(40)을 모두 블레이드(80) 내측의 제2마그넷(62)의 왼편에 설치하고, 틸트코일(50)은 제2마그넷(62) 우측의 블레이드(80) 외측면(81)에 설치하여 가능한 한 서로 멀리 이격시킴으로써 상호간의 영향을 최소화한 것이다.The tilt mechanism includes a pair of tilt coils 50 installed on the outer side surface 81 of the second magnet 62 side of the blade 80 and a base installed on the base 10 so as to face the tilt coils 50. It is comprised including the 3 magnets 51. The tilt coil 50 has a lower end thereof facing the third magnet 51 as shown in FIG. 3, and the third magnet 51 is polarized into N and S poles so that each pole has a pair of tilt coils 50. Will correspond to one of Accordingly, an electromagnetic force for driving the blade 80 in the tilt direction C is generated by the interaction between the current flowing through the tilt coil 50 and the magnetic force line caused by the third magnet 51. The tilt mechanism is spaced apart from the focus mechanism and the tracking mechanism in order to prevent the focus mechanism and the tracking mechanism from being affected as much as possible by the addition of the tilt mechanism. That is, as shown in FIG. 1, both the focus coil 30 and the tracking coil 40 are installed on the left side of the second magnet 62 inside the blade 80, and the tilt coil 50 has the second magnet 62. It is installed on the outer surface 81 of the blade 80 on the right side to minimize the mutual influence by spaced apart from each other as much as possible.
상기 구성에 있어서, 먼저 포커스 제어를 수행할 때에는 포커스코일(30)에 전류가 흐르게 되며, 상기 제1,2마그넷(61)(62)의 자기력선과의 상호 작용에 의해 포커스방향으로 구동력이 작용하게 된다. 따라서, 도 4와 같이 포커스코일(30)에 전류(I)가 흐르면 화살표 F1방향으로 전자기력이 작용하게 되며, 그 반대방향으로 전류가 흐르면 전자기력도 반대방향으로 작용된다.In the above configuration, when the focus control is first performed, a current flows in the focus coil 30, and the driving force acts in the focus direction by interaction with the magnetic force lines of the first and second magnets 61 and 62. do. Therefore, as shown in FIG. 4, when the current I flows in the focus coil 30, the electromagnetic force acts in the direction of arrow F1, and when the current flows in the opposite direction, the electromagnetic force acts in the opposite direction.
트래킹 제어는 상기 트래킹코일(40)에 흐르는 전류와 상기 제1,2마그넷(61)(62)의 자기력선과의 상호 작용에 의한 전자기력을 이용한다. 따라서, 트래킹코일(40)에 도 5와 같이 전류(I)가 흐르면 상기 제1,2마그넷(61)(62)과의 상호 작용으로 화살표 F2방향으로 전자기력이 발생되며, 이와 반대방향으로 전류가 흐르면 전자기력도 반대방향으로 형성된다.Tracking control uses an electromagnetic force caused by interaction between the current flowing through the tracking coil 40 and the magnetic force lines of the first and second magnets 61 and 62. Accordingly, when the current I flows through the tracking coil 40 as shown in FIG. 5, electromagnetic force is generated in the direction of arrow F2 by interaction with the first and second magnets 61 and 62, and the current is generated in the opposite direction. As it flows, electromagnetic forces are formed in the opposite direction.
그리고, 틸트 제어가 필요할 때에는, 상기 틸트코일(50)에 전류를 통전하여 상기 제3마그넷(51)의 자기력선과의 상호 작용으로 전자기력을 발생시킨다. 예컨대 도 6과 같이 틸트코일(50)에 전류(I)가 흐르면 화살표 F3 방향으로 블레이드(80)에 회전모멘트가 작용되며, 이와 반대로 틸트코일(50)에 전류가 흐르면 반대방향으로 블레이드(80)에 회전모멘트가 작용된다. 따라서, 틸트코일(50)에 공급되는 전류를 제어하면서 틸트 제어를 동적으로 수행할 수 있게 된다.When tilt control is necessary, the tilt coil 50 is energized to generate an electromagnetic force by interaction with a magnetic field line of the third magnet 51. For example, as shown in FIG. 6, when the current I flows through the tilt coil 50, the rotation moment is applied to the blade 80 in the direction of arrow F3. In contrast, when the current flows through the tilt coil 50, the blade 80 moves in the opposite direction. The moment of rotation is applied. Therefore, the tilt control can be performed dynamically while controlling the current supplied to the tilt coil 50.
결국, 본 구성의 대물렌즈 구동장치는 포커스 제어와 트래킹 제어 뿐 아니라 틸트 제어까지 동적으로 수행할 수 있는 것이다.As a result, the objective lens driving device of the present configuration can dynamically perform tilt control as well as focus control and tracking control.
상술한 바와 같이 본 발명에 따른 광픽업의 대물렌즈 구동장치에 의하면 다음과 같은 효과를 얻을 수 있다.As described above, according to the objective lens driving apparatus for the optical pickup according to the present invention, the following effects can be obtained.
첫째, 디스크와 광픽업 간의 틸트를 동적으로 제어할 수 있으므로 디스크에 광이 정확한 방향으로 입사되게 하여 데이터 기록과 재생의 품질을 더욱 향상시킬 수 있다.First, since the tilt between the disc and the optical pickup can be dynamically controlled, light can be incident on the disc in the correct direction, thereby further improving the quality of data recording and reproduction.
둘째, 틸트기구를 포커스기구나 틸트기구로부터 가능한 한 멀리 이격되게 배치함으로써 상호간의 신호 간섭을 방지할 수 있다.Second, by arranging the tilt mechanism as far as possible from the focus mechanism and the tilt mechanism, it is possible to prevent signal interference from each other.
본 발명은 상기에 설명되고 도면에 예시된 것에 의해 한정되는 것은 아니며, 다음에 기재되는 청구의 범위 내에서 더 많은 변형 및 변용예가 가능한 것임은 물론이다.It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020027869A KR20030089941A (en) | 2002-05-20 | 2002-05-20 | Objective lens driving apparatus for optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020027869A KR20030089941A (en) | 2002-05-20 | 2002-05-20 | Objective lens driving apparatus for optical pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20030089941A true KR20030089941A (en) | 2003-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020020027869A KR20030089941A (en) | 2002-05-20 | 2002-05-20 | Objective lens driving apparatus for optical pickup |
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| Country | Link |
|---|---|
| KR (1) | KR20030089941A (en) |
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2002
- 2002-05-20 KR KR1020020027869A patent/KR20030089941A/en not_active Application Discontinuation
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