KR20040100645A - Optical disk pick-up device - Google Patents
Optical disk pick-up device Download PDFInfo
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- KR20040100645A KR20040100645A KR1020030033063A KR20030033063A KR20040100645A KR 20040100645 A KR20040100645 A KR 20040100645A KR 1020030033063 A KR1020030033063 A KR 1020030033063A KR 20030033063 A KR20030033063 A KR 20030033063A KR 20040100645 A KR20040100645 A KR 20040100645A
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- focusing
- swing arm
- actuator
- hinge portion
- pickup device
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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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/0857—Arrangements for mechanically moving the whole head
- G11B7/08576—Swinging-arm positioners
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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
- G11B7/12—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 스윙암 방식의 광 디스크 드라이브의 광 픽업 장치에 관한 것으로서, 상세하게는 포커싱 제어에 의해 발생하는 대물렌즈의 틸트를 방지한 광디스크 드라이브의 광픽업 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for a swingarm type optical disk drive, and more particularly, to an optical pickup device for an optical disk drive which prevents tilting of an objective lens caused by focusing control.
광픽업 장치는 광디스크 드라이브에 사용되는 것으로서, 디스크의 기록면에 인접하여 데이터를 기록하거나 재생하는 장치이다. 종래의 광디스크 드라이브는 광학계의 크기와 무게로 인해 스윙암 방식의 픽업장치를 사용하지 못하고, 슬레드 방식의 픽업장치가 사용하였다. 그러나, 직접 광학계가 계발됨으로서, 광학계의 소형화가 달성되어, 광디스크 드라이브의 소형화의 최대의 걸림돌이 되었던, 픽업장치도 스윙암 방식으로 구현이 가능해졌다.An optical pickup apparatus is used for an optical disc drive and is an apparatus for recording or reproducing data adjacent to a recording surface of a disc. Conventional optical disc drives do not use a swingarm type pickup device due to the size and weight of the optical system, and a sled pickup device is used. However, since the direct optical system has been developed, miniaturization of the optical system has been achieved, and the pickup device, which has become the biggest obstacle to the miniaturization of the optical disc drive, can be implemented in a swing arm method.
도1 및 도2는 종래의 스윙암 방식의 광디스크 드라이브의 픽업장치의 구조를 도시한 도면으로서, 도1은 픽업장치의 사시도, 도2는 도1의 픽업장치의 측면도이다.1 and 2 are views showing the structure of a pickup apparatus of a conventional swing arm type optical disk drive. FIG. 1 is a perspective view of the pickup apparatus, and FIG. 2 is a side view of the pickup apparatus of FIG.
도시된 바와 같이, 종래의 스윙암 방식의 광디스크 드라이브의 픽업장치는 드라이브 본체에 수평방향으로 회전할 수 있도록 수평힌지부(1)에 의해 힌지 결합된 브시엠(Voice Coil Motor: 이하 'V.C.M.'이라 칭함) 액튜에이터(5)와, 상기 V.C.M. 액튜에이터(5)에 수직방향으로 회전할 수 있도록 수직 힌지부(3)에 의해 힌지 결합된 스윙암(2)암과, 상기 스윙암(2)을 수직방향, 즉 포커싱방향 으로 구동하는 포커싱 액튜에이터(6)와, 스윙암(2)의 끝단에 설치된 대물렌즈(4)를 포함하여 구성된다. 상기 포커싱 액튜에이터(6)는 코일이 권선 되어 형성되며 상기 스윙암(2)에 설치된 포커싱 코일(62)과, 상기 포커싱 코일(62)의 하부의 드라이브본체에 고정된 포커싱 자석(61)으로 구성된다.As shown, the pickup device of the conventional swingarm type optical disk drive is referred to as a VSI (Voice Coil Motor: 'VCM') which is hinged by the horizontal hinge unit 1 so as to rotate in a horizontal direction to the drive body. Actuator) 5, and the VCM A swing arm 2 hinged by a vertical hinge portion 3 so as to rotate in a vertical direction to the actuator 5, and a focusing actuator for driving the swing arm 2 in a vertical direction, that is, a focusing direction ( 6) and an objective lens 4 provided at the end of the swing arm 2. The focusing actuator 6 includes a focusing coil 62 formed by winding a coil and mounted on the swing arm 2, and a focusing magnet 61 fixed to a drive body below the focusing coil 62. .
상기 수직 힌지부(3)는 단층 판스프링(3)으로 구성된다.The vertical hinge portion 3 consists of a single layer leaf spring 3.
상기와 같은 구성을 가지는 종래의 광디스크 드라이브의 픽업장치는 V.C.M. 액튜에이터(5)에 의해 트래킹 방향으로 회동되어 트래킹 제어를 할 수 있으며, 포커싱 액튜에이터(6)에 의해 포커싱 방향으로 제어가 된다.The pickup device of the conventional optical disk drive having the above configuration is V.C.M. The actuator 5 is rotated in the tracking direction to perform tracking control, and the focusing actuator 6 is controlled in the focusing direction.
포커싱 제어에 대하여 상술하면, 포커싱 코일(62)에 흐르는 전류를 제어하면 포커싱 자석(61)과의 사이에 인력 혹은 척력이 발생하여, 스윙암(2)에 힘을 가한다. 상기 포커싱 액튜에이터(6)에 의해 힘이 스윙암(2)에 가해지면, 상기 판스프링(3)에 휨이 발생하여, 도2의 점선으로 도시된 바와 같이, 스윙암(2)이 회전을 하게 되고, 이에 따라서, 대물렌즈(4)가 광디스크의 기록면에 근접하거나 멀어져 초점을 맞추게 되어 포커싱 제어가 이루어진다. 또한, 포커싱 액튜에이터(6)에 의해 스윙암(2)에 가해지던 힘이 사라지면, 상기 판스프링(3)의 복원력에 의해 스윙암(2)이 원래의 위치로 복원된다.Focusing control will be described in detail above. When the current flowing through the focusing coil 62 is controlled, an attractive force or repulsive force is generated between the focusing magnet 61 and a force is applied to the swing arm 2. When a force is applied to the swing arm 2 by the focusing actuator 6, bending occurs in the leaf spring 3, causing the swing arm 2 to rotate as shown by the dotted line in FIG. 2. As a result, the objective lens 4 is brought closer or farther away from the recording surface of the optical disk to focus, thereby achieving focusing control. In addition, when the force applied to the swing arm 2 by the focusing actuator 6 disappears, the swing arm 2 is restored to its original position by the restoring force of the leaf spring 3.
그러나, 종래의 픽업장치는 포커싱 액튜에이터(6)에 의해 스윙암(2)이 회전을 하면, 도2에 도시된 바와 같이 θ만큼 틸트(tilt) 오차가 발생한다. 이러한, 틸트 오차는 단순한 포커싱 액튜에이터 동작에는 큰 문제점을 발생시키지는 않으나, 복층(dual layer) 기록층을 가지는 디스크를 기록 및 재생하기에는 적합하지 않다는 문제점이 있다.However, in the conventional pickup apparatus, when the swing arm 2 is rotated by the focusing actuator 6, a tilt error occurs by θ as shown in FIG. Such a tilt error does not cause a big problem in a simple focusing actuator operation, but has a problem in that it is not suitable for recording and reproducing a disc having a dual layer recording layer.
본 발명은 상기와 같은 문제점을 해결하고자 안출된 것으로서, 포커싱 제어에 의해 발생하는 대물렌즈의 틸트를 방지함으로서, 복층 기록층이 형성된 광디스크를 정확하게 재생할 수 있는 광픽업 장치를 제공함을 그 목적으로 한다.The present invention has been made to solve the above problems, and an object thereof is to provide an optical pickup apparatus capable of accurately reproducing an optical disk on which a multilayer recording layer is formed by preventing the tilt of an objective lens caused by focusing control.
도1 및 도2는 종래의 스윙암 방식의 광디스크 드라이브의 픽업장치의 구조를 도시한 도면으로서,1 and 2 are views showing the structure of a pickup apparatus of a conventional swing arm type optical disk drive.
도1은 픽업장치의 사시도1 is a perspective view of a pickup device
도2는 도1의 픽업장치의 측면도Figure 2 is a side view of the pickup device of Figure 1
도3 및 도4는 본 발명의 일실시예의 구조를 도시한 도면으로서,3 and 4 are diagrams showing the structure of an embodiment of the present invention,
도3은 광 픽업 장치의 사시도3 is a perspective view of an optical pickup device
도4는 도3의 스윙암이 상향으로 이동된 상태의 광 픽업 장치의 측면도4 is a side view of the optical pickup apparatus with the swing arm of FIG. 3 moved upward;
**도면의 주요부분에 대한 부호의 설명**** Description of the symbols for the main parts of the drawings **
1: 수평 힌지부 2: 스윙암1: horizontal hinge portion 2: swing arm
4: 대물렌즈 5: 브시엠 액튜에이터4: Objective Lens 5: BSI Actuator
6: 포커싱 액튜에이터 61: 포커싱 자석6: focusing actuator 61: focusing magnet
62: 포커싱 코일 7: 수직 힌지부62: focusing coil 7: vertical hinge portion
71: (상부) 판스프링 72: (하부) 판스프링71: (top) leaf spring 72: (bottom) leaf spring
본 발명은 상술한 바와 같은 목적을 달성하기 위하여, 수평 힌지부에 의해 트래킹 방향으로 회동할 수 있도록 힌지 결합된 브시엠 액튜에이터와; 상기 수평 힌지부를 사이에 두고 상기 브시엠 액튜에이터에 포커싱 방향으로 회동할 수 있도록 수직 힌지부에 의해 힌지 결합된 스윙암과; 상기 스윙암을 수직방향으로 구동하는 포커싱 액튜에이터와; 상기 스윙암의 끝단에 설치된 대물렌즈를 포함하여 구성되며, 상기 수직 힌지부는 상하 복층으로 형성된 판스프링에 의해 상기 스윙암을 연결하는 것을 특징으로 하는 광픽업 장치를 제공한다.In order to achieve the object as described above, the present invention comprises: a BSI actuator hinged to be rotated in the tracking direction by a horizontal hinge; A swing arm hinged by a vertical hinge portion so as to rotate in a focusing direction to the BSM actuator with the horizontal hinge portion therebetween; A focusing actuator for driving the swing arm in a vertical direction; And an objective lens installed at an end of the swing arm, wherein the vertical hinge portion connects the swing arm by leaf springs formed in upper and lower double layers.
여기서, 상기 판스프링은 상하로 각각 2개씩 설치된 것이 바람직하다.Here, it is preferable that the two leaf springs are respectively installed up and down.
그리고, 상기 포커싱 액튜에이터는 상기 스윙암의 하단에 고정된 포커싱 코일과; 상기 포커싱 코일을 마주보는 위치의 드라이브 본체에 설치된 포커싱 자석을; 포함하여 구성된 것이 효과적이다.The focusing actuator may include a focusing coil fixed to a lower end of the swing arm; A focusing magnet installed in the drive body at a position facing the focusing coil; It is effective to include.
이하, 첨부도면을 참조하여 본 발명의 실시 예에 관하여 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
다만, 본 발명을 설명함에 있어서, 공지된 기능 혹은 구성에 대해 구체적인 설명이 본 발명의 요지를 흩트리지 않도록 하기 위하여 생략하기로 한다.However, in describing the present invention, a detailed description of known functions or configurations will be omitted in order not to disturb the gist of the present invention.
도3 및 도4는 본 발명의 일실시예의 구조를 도시한 도면으로서, 도3은 광픽업 장치의 사시도, 도4는 도3의 스윙암이 상향으로 이동된 상태의 광픽업 장치의 측면도이다.3 and 4 illustrate the structure of an embodiment of the present invention. FIG. 3 is a perspective view of the optical pickup apparatus, and FIG. 4 is a side view of the optical pickup apparatus in a state in which the swing arm of FIG. 3 is moved upward.
이들 도면에 도시된 바와 같이, 본 발명의 일실시예의 광픽업 장치는 수평 힌지부(1)에 의해 트래킹 방향으로 회동할 수 있도록 힌지 결합된 브시엠 액튜에이터(5)와, 상기 수평 힌지부(1)를 사이에 두고 상기 브시엠 액튜에이터(5)에 포커싱 방향으로 회동할 수 있도록 수직 힌지부(7)에 의해 힌지 결합된 스윙암(2)과, 상기 스윙암(2)을 수직방향으로 구동하는 포커싱 액튜에이터(6)와, 상기 스윙암(2)의 끝단에 설치된 대물렌즈(4)를 포함하여 구성된다.As shown in these figures, the optical pickup device of one embodiment of the present invention is hinged coupled BMS actuator 5 so as to be rotated in the tracking direction by the horizontal hinge portion 1, the horizontal hinge portion (1) A swing arm 2 hinged by a vertical hinge portion 7 so as to rotate in a focusing direction to the BSM actuator 5, and to drive the swing arm 2 vertically. It comprises a focusing actuator (6) and an objective lens (4) provided at the end of the swing arm (2).
상기 수직 힌지부(7)는 상하 복층으로 형성된 판스프링(71, 72)에 의해 상기 스윙암(2)을 상기 브시엠 액튜에이터(5)에 연결한다. 즉, 상기 판스프링(71, 72)은 상하로 평행하게 설치된 상부 스프링(71)과 하부 스프링(72)으로 구성된다. 상기 상부 스프링(71)과 하부 스프링(72)은 각각 2개씩 설치된다.The vertical hinge portion 7 connects the swing arm 2 to the BMS actuator 5 by leaf springs 71 and 72 formed in a plurality of upper and lower layers. That is, the leaf springs 71 and 72 include an upper spring 71 and a lower spring 72 installed in parallel in the vertical direction. Two upper springs 71 and two lower springs 72 are provided.
상기 포커싱 액튜에이터(6)는 코일이 권선 되어 형성되며 상기 스윙암(2)의 하단에 설치된 포커싱 코일(62)과, 상기 포커싱 코일(62)의 하부의 드라이브 본체에 고정된 포커싱 자석(61)으로 구성된다.The focusing actuator 6 is formed by winding a coil and having a focusing coil 62 installed at a lower end of the swing arm 2, and a focusing magnet 61 fixed to a drive body below the focusing coil 62. It is composed.
이하, 본 발명의 일실시예의 동작에 관하여 설명한다.Hereinafter, the operation of one embodiment of the present invention will be described.
본 발명의 일실예의 광디스크 드라이브의 픽업장치는 V.C.M. 액튜에이터(5)에 의해 트래킹 방향으로 회동되어 트래킹 제어를 할 수 있으며, 포커싱 액튜에이터(6)에 의해 포커싱 방향으로 제어가 된다.One embodiment of the optical disk drive pickup device of the present invention is V.C.M. The actuator 5 is rotated in the tracking direction to perform tracking control, and the focusing actuator 6 is controlled in the focusing direction.
포커싱 제어에 대하여 상술하면, 포커싱 코일(62)에 흐르는 전류를 제어하면 포커싱 자석(61)과의 사이에 인력 혹은 척력이 발생하여, 스윙암(2)에 힘을 가한다. 상기 포커싱 액튜에이터(6)에 의해 힘이 스윙암(2)에 가해지면, 상기판스프링(7)에 휨이 발생하다.Focusing control will be described in detail above. When the current flowing through the focusing coil 62 is controlled, an attractive force or repulsive force is generated between the focusing magnet 61 and a force is applied to the swing arm 2. When a force is applied to the swing arm 2 by the focusing actuator 6, bending occurs in the leaf spring 7.
그러나, 본 발명의 일실시예는 종래의 기술과 달리 스윙암(2)이 상하로 설치된 2개의 판스프링(71, 72)에 의해 연결됨에 따라서, 도4에 도시된 바와 같이 상하로 평행하게 이동하게 된다. 이는 판스프링(71, 72)의 두께가 얇아서, 인장강성 혹은 압축강성이 굽힘 강성보다 현저히 크므로, 도2에 도시된 바와 같이 상부 스프링(71)이 압축되고 하부 스프링(72)이 인장되어 회전하지 않고, 상부 스프링(71)과 하부 스프링(72) 모두 굽힘 변형이 발생하여 상하로 평행하게 이동하게 된다.However, one embodiment of the present invention, unlike the prior art, as the swing arm 2 is connected by two leaf springs 71 and 72 installed up and down, as shown in Figure 4 moves in parallel up and down Done. This is because the thickness of the leaf springs (71, 72), the tensile or compressive stiffness is significantly greater than the bending stiffness, as shown in Figure 2 the upper spring 71 is compressed and the lower spring 72 is tensioned and rotated Without this, bending deformation occurs in both the upper spring 71 and the lower spring 72 to move up and down in parallel.
따라서, 대물렌즈(4)가 틸트 에러가 발생하지 않고 광디스크의 기록면에 근접하거나 멀어져 초점을 맞추게 되어 포커싱 제어가 이루어진다. 따라서, 복층(dual layer) 기록층을 가지는 디스크를 기록 및 재생을 정확하게 할 수 있다.Therefore, the objective lens 4 focuses closer to or farther away from the recording surface of the optical disk without causing a tilt error. Therefore, it is possible to accurately record and reproduce a disc having a dual layer recording layer.
이상에서는 본 발명의 바람직한 실시예를 예시적으로 설명하였으나, 본 발명의 범위는 이와 같은 특정 실시예에만 한정되는 것은 아니며, 특허청구범위에 기재된 범주 내에서 적절하게 변경 가능한 것이다.Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.
본 발명은 포커싱 제어에 의해 발생하는 대물렌즈의 틸트를 방지함으로서, 복층 기록층이 형성된 광디스크를 정확하게 재생할 수 있는 광픽업 장치를 제공한다.The present invention provides an optical pickup apparatus that can accurately reproduce an optical disc on which a multilayer recording layer is formed by preventing the tilt of an objective lens caused by focusing control.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030033063A KR20040100645A (en) | 2003-05-23 | 2003-05-23 | Optical disk pick-up device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030033063A KR20040100645A (en) | 2003-05-23 | 2003-05-23 | Optical disk pick-up device |
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| Publication Number | Publication Date |
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| KR20040100645A true KR20040100645A (en) | 2004-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100714101B1 (en) * | 2004-12-08 | 2007-05-02 | 한국전자통신연구원 | Small size optical/magnetic head actuator with a pivot hinge and a halbach array magnet |
| WO2007131877A1 (en) * | 2006-05-13 | 2007-11-22 | Thomson Licensing S.A. | Suspension arm actuator |
| WO2008065034A1 (en) * | 2006-11-30 | 2008-06-05 | Thomson Licensing | Suspension arm actuator with damping for a scanning device |
-
2003
- 2003-05-23 KR KR1020030033063A patent/KR20040100645A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100714101B1 (en) * | 2004-12-08 | 2007-05-02 | 한국전자통신연구원 | Small size optical/magnetic head actuator with a pivot hinge and a halbach array magnet |
| WO2007131877A1 (en) * | 2006-05-13 | 2007-11-22 | Thomson Licensing S.A. | Suspension arm actuator |
| WO2008065034A1 (en) * | 2006-11-30 | 2008-06-05 | Thomson Licensing | Suspension arm actuator with damping for a scanning device |
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