KR930009221B1 - Operating device of optical pick-up lenz - Google Patents
Operating device of optical pick-up lenz Download PDFInfo
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- KR930009221B1 KR930009221B1 KR1019910014538A KR910014538A KR930009221B1 KR 930009221 B1 KR930009221 B1 KR 930009221B1 KR 1019910014538 A KR1019910014538 A KR 1019910014538A KR 910014538 A KR910014538 A KR 910014538A KR 930009221 B1 KR930009221 B1 KR 930009221B1
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- magnet
- objective lens
- support shaft
- support
- ring
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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
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Abstract
Description
제 1 도는 종래 광픽업 대물렌즈 구동장치를 도시한 분해 사시도.1 is an exploded perspective view showing a conventional optical pickup objective lens driving device.
제 2 도는 본 발명에 따른 광픽업의 대물렌즈 구동장치를 도시한 분해 사시도.2 is an exploded perspective view showing the objective lens driving apparatus of the optical pickup according to the present invention.
제 3 도는 본 발명에 따른 광픽업의 대물렌즈 구동장치에 있어 렌즈홀더와 지지축을 발췌하여 확대 도시한 평면도.3 is an enlarged plan view showing an extract of the lens holder and the support shaft in the objective lens driving apparatus of the optical pickup according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 렌즈홀더 1a : 대물렌즈1: Lens holder 1a: Objective lens
2 : 포커싱용코일 3 : 트랙킹용코일2: focusing coil 3: tracking coil
4 : 지지대 4a : 지지축4: Support 4a: Support Shaft
5 : 영구자석5: permanent magnet
본 발명의 광픽업의 대물렌즈 구동장치에 관한 것으로서 특히 대물렌즈 고정방식이 축타입인 광픽업의 대물렌즈 구동장치에 관한 것이다.The present invention relates to an objective lens driving apparatus for an optical pickup, and more particularly, to an objective lens driving apparatus for an optical pickup in which the objective lens fixing method is an axis type.
일반적으로 광디스크용 레이저픽업의 대물렌즈는, 정상위치 이탈에 의한 에러의 보정수단 즉, 광디스크에 대한 대물렌즈의 상하방향의 떨림에 따라 촛점이 디스크에 맺혀지지 않는 것을 방지하기 위한 포커싱(focusing)이동과, 디스크 구동모터 축중심에 대한 디스크중심의 불일치를 바로 잡아주기 위한 트랙킹(tracking)이동 등을 위한 위치변경수단이 필요하다. 이때 에러보정수단에 의한 대물렌즈의 두방향의 움직임이 서로 간섭을 일으키지 않은 상태에서 원활하고 정확한 대물렌즈의 이동을 도울 수 있는 대물렌즈 지지 장치가 요구된다.In general, an objective lens of an optical disk laser pickup has a focusing movement for correcting an error due to deviation from a normal position, that is, focusing to prevent the focus from being formed on the disk due to the shaking of the objective lens with respect to the optical disk. And a position changing means for tracking movement to correct the disc center mismatch with respect to the disc drive motor shaft center. At this time, there is a need for an objective lens support device that can help smoothly and accurately move the objective lens in a state in which the movement of the objective lens by the error correction means does not interfere with each other.
이러한 대물렌즈의 지지를 위한 고정방식에 따라 크게 2가지 타입 즉, 판스프링타입과 축타입으로 분류되는데 판스프링타입은 상당한 길이의 판스프링이 다수 사용되기 때문에 픽업의 전체 크기가 커질 뿐만 아니라 촛점마춤 이동과 궤도맞춤 이동 즉, 포커싱이동과 트랙킹이동이 동시에 일어날 때에 강도가 미약하고 유연한 판스프링에 의해 상호 운동의 간섭현상이 일어나고 이로 인해 소위 피이드백에 의한 에러수정에 소요되는 시간이 길어지는 문제가 발생된다.According to the fixing method for supporting the objective lens, it is classified into two types, namely the leaf spring type and the shaft type. The leaf spring type has a large number of leaf springs of considerable length, so that the overall size of the pickup is not only large but also focused. When movement and orbital movement, that is, focusing movement and tracking movement, occur at the same time, the weak stiffness and the flexible leaf spring cause interference of mutual motion, which causes a long time for error correction by so-called feedback. Is generated.
이데 비해 축타입의 경우는 간섭현상이 적고 그 부피도 작아지는 장점이 있다. 이러한 축타입의 대물렌즈 고정방식을 채용한 종래 광픽업 대물렌즈 구동장치는 제 1 도에 도시된 바와 같이, 대물렌즈(10a)가 장착되는 렌즈홀더(10)와 상기 렌즈홀더(10)를 축타입 즉, 지지축(20a)으로 고정하는 지지대(20)를 가지며, 상기 렌즈홀더(10)에는 수직이동코일 즉 포커싱용코일(30) 및 수평이동코일 즉 트랙킹용코일(40)이 마련되어 있으며, 상기 렌즈홀더(10)는 지지대(20)상에 마련된 지지축(20a)에 회전가능하게 설치되도록 구성되어 있다.On the other hand, the shaft type has the advantage of less interference and its volume is smaller. In the conventional optical pickup objective lens driving apparatus employing the shaft-type objective lens fixing method, as shown in FIG. 1, the lens holder 10 to which the objective lens 10a is mounted and the lens holder 10 are shafted. Type, that is, having a support 20 fixed to the support shaft 20a, the lens holder 10 is provided with a vertical moving coil, that is, a focusing coil 30 and a horizontal moving coil, that is, a tracking coil 40, The lens holder 10 is configured to be rotatably installed on the support shaft 20a provided on the support 20.
상기와 같은 구성은 종래 광픽업의 대물렌즈 구동장치는 그 렌즈홀더(10)가 포커싱용코일(30)에 의해 수직으로 움직이고 트랙킹용코일(40)에 의해 회전하게 된다. 하지만 상술한 종래 광픽업의 대물렌즈 구동장치는, 지지대(20)상의 지지축(20a)에 회전가능하게 지지된 렌즈홀더(10)의 포커싱특성은 지지축(20a)과 렌즈홀더(10)의 상호마찰로 인해 그 특성이 양호하지 못하며 특히 먼지가 심한 곳에서는 그 수명에 치명적인 약점을 가지고 있다.In the above configuration, the objective lens driving apparatus of the conventional optical pickup moves the lens holder 10 vertically by the focusing coil 30 and rotates by the tracking coil 40. However, in the above-described conventional optical lens driving apparatus, the focusing characteristic of the lens holder 10 rotatably supported by the support shaft 20a on the support 20 is that the support shaft 20a and the lens holder 10 Due to mutual friction, its properties are not good, and especially in dusty areas, it has a fatal weakness in its life.
본 발명은 상술한 종래 광픽업의 대물렌즈 구동장치의 문제점을 감안하여 창출된 것으로서, 지지대의 지지축과 이에 축결합되는 렌즈홀더 사이에 각각 자석을 구비하여 상호간에 저혀 마찰이 발생되지 않은 상태에서 포커싱 및 트랙킹이동을 가능하게 하여 그 특성을 향상시킬 수 있는 광픽업의 대물렌즈 구동장치를 제공함에 그 목적이 있다.The present invention has been made in view of the above-mentioned problems of the objective lens driving apparatus of the optical pickup, and is provided with magnets between the support shaft of the support and the lens holder axially coupled thereto, so that the friction between them is not generated. It is an object of the present invention to provide an optical pickup objective lens driving device capable of focusing and tracking movement and improving its characteristics.
상기 목적을 달성하기 위하여 본 발명에 따른 광픽업의 대물렌즈 구동장치는, 지지축을 갖는 지지대와, 대물렌즈가 장착되며 상기 지지대의 지지축에 결합되도록 축구멍이 형성된 렌즈홀더를 구비하는 광픽업의 대물렌즈 구동장치에 있어서, 상기 지지축에 그 축방향을 따라 링형자석을 부착하고 상기 링형자석이 부착된 지지축이 삽입되어지는 렌즈홀더의 축삽입구멍에 상기 링형자석이 삽입되는 자석부쉬를 설치하여 상기 링형자석과 상기 링형부쉬 상호간에 전자적인 척력 또는 인력에 의한 일정갭이 유지되도록 구성하여 된 것에 그 특징이 있다.In accordance with an aspect of the present invention, there is provided an objective lens driving apparatus for an optical pickup, comprising: a support having a support shaft; and a lens holder having an objective lens mounted thereon and having a shaft hole formed to be coupled to the support shaft of the support. In the objective lens driving apparatus, a magnet bush is installed in which the ring magnet is inserted in the shaft insertion hole of the lens holder into which the ring magnet is attached to the support shaft along the axial direction and the support shaft to which the ring magnet is attached is inserted. Therefore, the ring-shaped magnet and the ring-shaped bush is characterized in that it is configured to maintain a constant gap due to electronic repulsive force or attraction force.
이하 본 발명에 따른 광픽업의 대물렌즈 구동장치의 바람직한 일실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of an objective lens driving apparatus for an optical pickup according to the present invention will be described in detail with reference to the accompanying drawings.
제 2 도 내지 제 3 도에 도시된 바와 같이 본 발명에 따른 광픽업의 대물렌즈 구동장치는, 그 상면에 대물렌즈(1a)가 장착되며 그 외주면에는 포커싱용코일(2)과 트랙킹용코일(3)이 결합된 렌즈홀더(1)와, 상기 렌즈홀더(1)를 축지지하도록 지지축(4a)을 갖는 지지대(4)를 구비하여 된 것으로서, 상기 지지대(4)상에는 상기 렌즈홀더(1)의 외주면에 결합된 포커싱용코일(2)과 트랙킹용코일(3)에 자계를 가하는 영구자석(5) 및 폐자기회로를 이루기 위해 내요크(6) 및 외요크(7)가 설치되어 있다.As shown in FIGS. 2 to 3, the objective lens driving apparatus of the optical pickup according to the present invention has an objective lens 1a mounted on an upper surface thereof, and a focusing coil 2 and a tracking coil (2) on an outer circumferential surface thereof. And a support holder 4 having a support shaft 4a so as to axially support the lens holder 1, wherein the lens holder 1 is mounted on the support 4; The inner yoke (6) and the outer yoke (7) are provided to form a permanent magnet (5) that applies a magnetic field to the focusing coil (2) and the tracking coil (3) coupled to the outer peripheral surface of .
또한 상기 지지대(4)상의 지지축(4a)에는 그 축방향을 따라 링형자석(4b)이 부착되어 있으며, 이와 대응되는 렌즈홀더(1)의 축삽입구멍(1b)에는 자석부쉬(1c)가 삽입되어 있다. 여기에서 상기 링형자석(4b)과 상기 자석부쉬(1c) 상호간의 대향자극면은 N, S극이 교호로 배치되며 링형자석(4b)이 삽입된 지지축(4a)과 렌즈홀더(1)의 축삽입구멍(1b)에 삽입된 자석부쉬(1c)와는 링형자석(4b)과 자석부쉬(1c) 상호간에 전자적인 척력 또는 인력에 의해 일정갭(gap : a)을 유지하게 된다.In addition, a ring magnet 4b is attached to the support shaft 4a on the support 4 along the axial direction thereof, and a magnet bush 1c is provided in the shaft insertion hole 1b of the lens holder 1 corresponding thereto. It is inserted. Here, the opposite magnetic pole surfaces between the ring magnet 4b and the magnet bush 1c are alternately arranged with the N and S poles, and the support shaft 4a and the lens holder 1 into which the ring magnet 4b is inserted. The magnet bush 1c inserted into the shaft insertion hole 1b maintains a certain gap (a gap) between the ring-shaped magnet 4b and the magnet bush 1c by electronic repulsive force or attraction force.
상기와 같이 구성된 본 발명에 따른 광픽업의 대물렌즈 구동장치에 의하면, 대물렌즈(1a)가 장착된 렌즈홀더(1)가 디스크표면의 왜곡 또는 흔들림에 추종하여 포커싱이동 및 트랙킹이동을 함에 있어 상기 렌즈홀더(1)와, 이를 지지하는 지지대(4)상의 지지축(4a)은 상호 아무런 마찰없이 이동되어지는 것이다. 즉, 렌즈홀더(1)의 축삽입구멍(1b)에 삽입된 자석부쉬(1c)와, 상기 지지축(4a)에 부착된 링형자석(4b)은 서로 일정갭(a)을 유지한채 서로 반발력을 갖도록 설치된 것이기 때문에 항상 그 일정갭(a)을 유지한채 포커싱 및 트랙킹 이동을 하는 것이다. 따라서 렌즈홀더(1)와 지지축(4a) 상호간에 마찰이 발생되지 않는 것이어서 포커싱특성 및 트랙킹특성이 향상된 것이다.According to the objective lens driving apparatus of the optical pickup according to the present invention configured as described above, the lens holder 1 equipped with the objective lens (1a) in accordance with the distortion or shaking of the disk surface to perform the focusing movement and the tracking movement The lens holder 1 and the support shaft 4a on the support 4 supporting the lens holder 1 are moved without any friction. That is, the magnet bushing 1c inserted into the shaft insertion hole 1b of the lens holder 1 and the ring-shaped magnet 4b attached to the support shaft 4a are held together by the repulsive force while maintaining a constant gap a. Since it is installed so as to have the focusing and tracking movement is always maintained while maintaining a constant gap (a). Therefore, no friction occurs between the lens holder 1 and the support shaft 4a, thereby improving focusing characteristics and tracking characteristics.
상술한 바와 같이 본 발명에 광픽업의 대물렌즈 구동장츠는 포커싱이동 및 트랙킹이동함에 있어 렌즈홀더와 지지축 상호간에 전혀 마찰이 발생되지 않는 것이어서 포커싱특성 및 트랙킹특성이 향상된 것이며 특히 먼지가 심한 곳에 있어 그 성능이 매우 뛰어난 것이다.As described above, the objective lens driving device of the optical pickup according to the present invention does not generate friction at all between the lens holder and the support shaft in the focusing movement and the tracking movement, so that the focusing characteristics and the tracking characteristics are improved, and especially in a dusty place. Its performance is very good.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910014538A KR930009221B1 (en) | 1991-08-22 | 1991-08-22 | Operating device of optical pick-up lenz |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910014538A KR930009221B1 (en) | 1991-08-22 | 1991-08-22 | Operating device of optical pick-up lenz |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930004959A KR930004959A (en) | 1993-03-23 |
| KR930009221B1 true KR930009221B1 (en) | 1993-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019910014538A KR930009221B1 (en) | 1991-08-22 | 1991-08-22 | Operating device of optical pick-up lenz |
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| Country | Link |
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| KR (1) | KR930009221B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100390807B1 (en) * | 1998-12-28 | 2003-11-15 | 주식회사 대우일렉트로닉스 | Optical Pickup Actuator with Magnetic Axis |
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1991
- 1991-08-22 KR KR1019910014538A patent/KR930009221B1/en not_active IP Right Cessation
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