KR20030050753A - Optical pick-up actuator - Google Patents

Optical pick-up actuator Download PDF

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Publication number
KR20030050753A
KR20030050753A KR1020010081268A KR20010081268A KR20030050753A KR 20030050753 A KR20030050753 A KR 20030050753A KR 1020010081268 A KR1020010081268 A KR 1020010081268A KR 20010081268 A KR20010081268 A KR 20010081268A KR 20030050753 A KR20030050753 A KR 20030050753A
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KR
South Korea
Prior art keywords
lens holder
focusing
lens
tracking
tilting
Prior art date
Application number
KR1020010081268A
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Korean (ko)
Inventor
박관우
서민석
Original Assignee
엘지전자 주식회사
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Priority to KR1020010081268A priority Critical patent/KR20030050753A/en
Publication of KR20030050753A publication Critical patent/KR20030050753A/en

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Classifications

    • 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
    • G11B7/08—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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • 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

Abstract

PURPOSE: An optical pickup actuator is provided to perform tilting, focusing, and tracking by using different wire springs, thereby preventing a cross talk from generating when the tilting, focusing, and tracking are performed at the same time. CONSTITUTION: A lens holder secures an objective lens(23) condensing a laser light source at an optical recording medium. The lens holder includes a magnetic circuit for driving the objective lens. The lens holder is divided into a cover part(21) securing the objective lens and a base part. A radial wire spring(32) is arranged at the cover part of the lens holder to support the lens holder when tilting is performed by a radial coil, a radial yoke, and a magnet. A wire spring(28) is arranged at the base part to support the lens holder when a focusing and a tracking are performed by applying current to a focusing coil(25) and a tracking coil(27).

Description

광픽업 액츄에이터{OPTICAL PICK-UP ACTUATOR}Optical Pickup Actuator {OPTICAL PICK-UP ACTUATOR}

본 발명은 광픽업 액츄에이터에 관한 것으로, 보다 구체적으로는 대물렌즈를안착하는 렌즈홀더를 덮개부와 베이스부로 분리하여 틸팅 동작시 분리된 덮개부만 움직이도록 하여 액츄에이터가 광디스크의 트랙을 추종할 때, 발생하는 크로스 토크를 방지한 광픽업 액츄에이터에 관한 것이다.The present invention relates to an optical pickup actuator, and more particularly, by separating a lens holder for mounting an objective lens into a cover portion and a base portion so that only the cover portion separated during a tilting operation moves the track of the optical disc. The present invention relates to an optical pickup actuator that prevents cross talk from occurring.

도 1은 종래 기술에 따른 광 픽업 액츄에이터의 구조를 도시한 평면도이다.1 is a plan view showing the structure of an optical pickup actuator according to the prior art.

도 1에 도시된 바와 같이, 레이저 다이오드 광원으로부터의 발생하는 광 빔을 광디스크의 정보 기록 면에 집광하는 대물렌즈(3)와 상기 대물렌즈(3)를 내경에 삽입한 렌즈 홀더(1)와 상기 렌즈 홀더(1)의 양측으로 일정 거리 이격 되어 각각 배치된 마그네트(10)와, 상기 마그네트(10)의 배면에 배치되며, 상기 마그네트(10)에서 발생되는 자속의 누설을 방지하기 위한 요크(9)와, 상기 렌즈 홀더(1)의 외부 둘레에 감겨져 있는 포커싱 코일(5)과 상기 포커싱 코일(5)이 감겨져 있는 방향과 수직한 방향으로, 상기 포커싱 코일(5) 상에 각각 2개씩 배치된 트래킹 코일(7)과 상기 렌즈 홀더(1)의 양측면에 고정 배치되어 지지부 역할을 하는 와이어 스프링(8)과, 상기 와이어 스프링(8)을 고정하는 댐퍼부(11)로 구성되어 있다.As shown in Fig. 1, the objective lens 3 for condensing the light beam generated from the laser diode light source on the information recording surface of the optical disc, and the lens holder 1 in which the objective lens 3 is inserted into the inner diameter; Magnets 10 disposed at both sides of the lens holder 1 at a predetermined distance from each other, and a yoke 9 disposed on the rear surface of the magnet 10 to prevent leakage of magnetic fluxes generated by the magnet 10. And two focusing coils 5 wound around the outer periphery of the lens holder 1 and two on the focusing coil 5 in a direction perpendicular to the direction in which the focusing coils 5 are wound. It consists of a tracking coil (7) and a wire spring (8) fixedly arranged on both sides of the lens holder (1) to serve as a support, and a damper (11) for fixing the wire spring (8).

상기와 같은 구조를 갖는 액츄에이터는 다음과 같은 방식으로 동작한다.An actuator having such a structure operates in the following manner.

광 픽업 액츄에이터는 대물렌즈(3)의 포커싱 동작과 트래킹 동작을 위하여 상기 대물렌즈(3)가 배치된 상기 렌즈 홀더(1)의 좌우에 배치된 상기 마그네트들(10)의 자기장의 힘을 이용하여 상하, 좌우로 움직이는 동작을 한다. 이러한, 광 픽업 액츄에이터의 구동력은 상기 마그네트(10)과 상기 요크(9)가 이루는 자기장 공간 안에 상기 트래킹 코일(7) 및 상기 포커싱 코일(5)에 전류를 인가하여 플레밍의 왼손법칙에 의한 로렌쯔 힘에 의하여 생성된다.The optical pickup actuator uses the force of the magnetic field of the magnets 10 arranged on the left and right of the lens holder 1 on which the objective lens 3 is disposed for the focusing and tracking operation of the objective lens 3. It moves up and down and left and right. The driving force of the optical pickup actuator is a Lorentz force according to Fleming's left hand law by applying a current to the tracking coil 7 and the focusing coil 5 in the magnetic field space formed by the magnet 10 and the yoke 9. Is generated.

상기 트래킹 코일(7)에 전류를 인가함으로써 상기 대물렌즈(1)를 좌우로 동작시키고, 상기 포커싱 코일(5)에 전류를 인가함으로써 상기 대물렌즈(1)를 상하로 동작시킨다.The objective lens 1 is operated left and right by applying a current to the tracking coil 7, and the objective lens 1 is operated up and down by applying a current to the focusing coil 5.

그러나, 종래의 액츄에이터에서 틸팅 구동계를 구성하여 틸팅을 보정하게 괴면, 렌즈 홀더 전체를 움직이게 되어 트래킹과 포커싱 동작시, 이미 틸팅 보정시 받은 와이어 스프링의 강한 텐션이 트래킹과 포커싱 동작에 영향을 주어서 정확한 트랙의 데이터를 읽지 못하고 옆의 트랙의 데이터를 읽게 되는 크로스 토크가 발생하게 된다.However, in the conventional actuator, the tilting drive system is configured to correct the tilting, and the entire lens holder is moved so that during the tracking and focusing operation, the strong tension of the wire spring already received during the tilting correction affects the tracking and focusing operation. A crosstalk occurs when the data of the next track cannot be read without reading the data of the track.

본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 액츄에이터의 렌즈홀더를 덮개부와 베이스부로 분리하여, 레디얼 방향의 틸팅 동작시에는 렌즈홀더의 덮개부만 베이스부와 독립하여 틸팅되도록 하여, 포커싱 동작과 트래킹 동작이 혼합된 경우에도 와이어 스프링에 강한 텐션이 발생하지 않도록하여 크로스 토크를 제거한 광픽업 액츄에이터를 제공함에 그 목적이 있다.The present invention has been made to solve the above problems of the prior art, by separating the lens holder of the actuator into the cover portion and the base portion, so that only the cover portion of the lens holder is tilted independently of the base portion during the tilting operation in the radial direction Accordingly, an object of the present invention is to provide an optical pickup actuator which eliminates cross talk by preventing strong tension from occurring in a wire spring even when a focusing operation and a tracking operation are mixed.

도 1은 종래 기술에 따른 광 픽업 액츄에이터의 구조를 도시한 평면도.1 is a plan view showing the structure of an optical pickup actuator according to the prior art.

도 2는 본 발명에 따른 광 픽업 액츄에이터의 구조를 도시한 평면도.2 is a plan view showing the structure of an optical pickup actuator according to the present invention;

도 3은 본 발명에서 사용되는 렌즈홀더 덮개부의 측면도.Figure 3 is a side view of the lens holder cover portion used in the present invention.

도 4는 본 발명에서 사용되는 렌즈홀더 베이스부에 렌즈홀더 덮개부가 결합된 구조를 설명하기 위한 도면.Figure 4 is a view for explaining a structure in which the lens holder cover portion coupled to the lens holder base portion used in the present invention.

도 5는 본 발명에 따른 틸팅 동작을 설명하기 위한 도면.5 is a view for explaining a tilting operation according to the present invention.

도 6은 본 발명에 따른 틸팅 동작 후 포커싱 동작을 설명하기 위한 도면.6 is a view for explaining a focusing operation after the tilting operation according to the present invention.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

21: 렌즈홀더 23: 대물렌즈21: lens holder 23: objective lens

25: 포커싱 코일 27: 트래킹 코일25: focusing coil 27: tracking coil

28: 와이어 스프링 29: 요크28: wire spring 29: yoke

30: 마그네트 32: 레디얼 와이어 스프링30: magnet 32: radial wire spring

상기한 목적을 달성하기 위한, 본 발명에 따른 광픽업 액츄에이터는,In order to achieve the above object, the optical pickup actuator according to the present invention,

광기록 매체에 레이저 광원을 집광하는 대물렌즈를 안착시킨 렌즈홀더;A lens holder on which an objective lens for condensing a laser light source is mounted on an optical recording medium;

상기 대물렌즈의 구동을 위한 자기회로부 및 상기 렌즈홀더를 지지하기 위해 렌즈홀더의 양측에 형성된 지지수단을 포함하며, 상기 렌즈홀더는 독립된 틸팅 구동이 가능하도록 분할되어 있는 것을 특징으로 한다.And magnetic support for driving the objective lens and support means formed on both sides of the lens holder to support the lens holder, wherein the lens holder is divided to enable independent tilting driving.

여기서, 상기 분할된 양측 렌즈홀더의 내측에 형성된 레디얼 틸팅 구동을 위한 자가 회로계를 더 포함하고, 상기 지지수단은 레디얼 틸팅을 위한 지지수단을 추가로 구비하며, 상기 분할된 렌즈홀더는 소정의 걸림수단에 의해 연결되는 것을 특징으로 한다.Here, the apparatus further includes a self-circuit system for radial tilting driving formed on the inner side of the divided lens holders, wherein the supporting means further includes a supporting means for radial tilting, and the divided lens holder has a predetermined latch. Characterized in that connected by means.

본 발명에 의하면, 렌즈홀더를 덮개부와 베이스부로 분리한 다음, 대물렌즈가 안착된 렌즈홀더 덮개부에서는 틸팅 동작만 하고, 베이스부에서는 포커싱 동작과 트래킹 동작을 하도록 하여 틸팅 구동시 포커스와 트래킹 와이어 스프링에 영향을 주지 않으므로 크로스 토크가 발생하는 것을 방지하였다.According to the present invention, the lens holder is separated into a cover part and a base part, and then the lens holder cover part on which the objective lens is mounted is only tilted, and the focusing and tracking operations are performed at the base part so that the focus and tracking wires are tilted. Since it does not affect the spring, crosstalk is prevented from occurring.

이하, 첨부한 도면에 의거하여 본 발명의 바람직한 실시 예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 광 픽업 액츄에이터의 구조를 도시한 평면도이다.2 is a plan view showing the structure of the optical pickup actuator according to the present invention.

도 2에 도시된 바와 같이, 레이저 다이오드 광원으로부터 발생하는 광 빔을 광디스크의 정보기록 면에 집광하는 대물렌즈(23)와, 상기 대물렌즈(23)를 안착한 렌즈홀더 덮개부(21)와, 상기 렌즈홀더 덮개부(21와 결합 배치되는 렌즈홀더 베이스부(도시되지 않음)와, 상기 렌즈홀더 베이스부의 양측에 소정거리 이격 되어 대향 배치된 마그네트(30)와, 상기 마그네트(30)의 배면에 배치되며, 상기 마그네트(30)에서 발생되는 자속의 누설을 차단하기 위한 주요크(29)와, 상기 렌즈홀더 베이스부 상에 배치되면서, 상기 렌즈홀더 베이스부의 외주 둘레를 따라 감겨져 있는 포커싱 코일(25)과, 상기 포커싱 코일(25) 상의 마그네트(30)와 대향하도록 배치되며, 상기 포커싱 코일(25) 방향과 수직한 방향으로 감겨져 있는 트래킹코일(27)과, 상기 렌즈홀더 덮개부(21)에는 틸팅 동작시 지지부 역할을 하는 레디얼 와이어 스프링(32)과, 상기 렌즈홀더 베이스부에 각각 고정배치되어 트래킹 및 포커싱 동작시 지지부 역할을 하는 와이어 스프링(28)으로 구성되어 있다.As shown in Fig. 2, the objective lens 23 for condensing the light beam generated from the laser diode light source on the information recording surface of the optical disc, the lens holder cover portion 21 on which the objective lens 23 is mounted, and A lens holder base part (not shown) coupled to the lens holder cover part 21, a magnet 30 disposed to face each other at a predetermined distance from both sides of the lens holder base part, and disposed on a rear surface of the magnet 30. The main coil 29 for blocking leakage of the magnetic flux generated by the magnet 30 and the focusing coil 25 wound along the outer circumference of the lens holder base part while being disposed on the lens holder base part. And a tracking coil 27 disposed to face the magnet 30 on the focusing coil 25 and wound in a direction perpendicular to the focusing coil 25 and a tilting portion of the lens holder cover 21. Radial wire spring 32 that serves as a support during operation, and the wire spring 28 that is fixedly disposed in the lens holder base portion to serve as a support during tracking and focusing operations, respectively.

또한, 도면에서는 도시되지 않았지만, 상기 렌즈홀더 덮개부(21)의 양측 가장자리 영역이 접혀진 레디얼바가 상기 렌즈홀더 베이스부 내부에 삽입되어 배치되고, 상기 렌즈홀더 베이스부 내부에서는 하부에서 삽입되어 틸팅 동작시 자기장을 형성하는 레디얼 요크와 마그네트(도4 참조)가 배치되어 있고, 상기 렌즈홀더 덮개부(21)의 레디얼바의 가장자리에는 레디얼 코일이 배치되어 있다.In addition, although not shown in the drawings, a radial bar in which both edge regions of the lens holder cover portion 21 are folded is inserted and disposed in the lens holder base portion, and is inserted from below in the lens holder base portion to be tilted. A radial yoke and a magnet (see Fig. 4) which form a magnetic field are arranged, and a radial coil is arranged at the edge of the radial bar of the lens holder cover portion 21.

상기와 같은 구조를 갖는 광픽업 액츄에이터는 다음과 같은 방식으로 동작한다.The optical pickup actuator having the structure as described above operates in the following manner.

상기 렌즈홀더 베이스부 외측에 배치되어 있는 마그네트(30)에 의하여 자기장이 형성된 구간에서, 상기 포커싱 코일(25)과 트래킹 코일(27)에 전류를 인가하여 포커싱 동작과 트래킹 동작을 실시한다. 그리고, 틸팅 동작을 하기 위하여는 상기 렌즈홀더 덮개부(21)의 레디얼바에 배치된 레디얼 코일과 상기 렌즈홀더 베이스부 내부에 배치된 레디얼 요크와 마그네트에 의하여 상기 렌즈홀더 베이스부는 고정되고, 상기 렌즈홀더 덮개부(21)만 틸팅 동작을 하게 된다.In a section in which a magnetic field is formed by the magnet 30 disposed outside the lens holder base part, a current is applied to the focusing coil 25 and the tracking coil 27 to perform a focusing operation and a tracking operation. In order to perform the tilting operation, the lens holder base part is fixed by a radial coil disposed in a radial bar of the lens holder cover part 21, a radial yoke and a magnet disposed inside the lens holder base part, and the lens holder is fixed. Only the cover portion 21 is tilted.

도 3은 본 발명에서 사용되는 렌즈홀더 덮개부의 측면도로서, 도시된 바와 같이, 양측 가장자리 부분이 접힌 레디얼 바(21a)와 중심부 양측면에는 상기 렌즈홀더 베이스부와 결합할 수 있도록 걸쇠부(21b)가 형성되어 있다. 따라서, 상기 레디얼 바(21a)의 가장자리 끝단에는 레디얼 코일(도시하지 않음)이 배치되어 틸팅동작을하게 되고, 상기 걸쇠부(21b)는 상기 렌즈홀더 덮개부(21)가 틸팅 동작을 할 때 회전축 역할을 하게 된다.3 is a side view of the lens holder cover portion used in the present invention. As shown in the drawing, the radial bar 21a on which both edge portions are folded and the clasp portion 21b are coupled to the lens holder base portion on both sides of the central portion. Formed. Accordingly, a radial coil (not shown) is disposed at an edge end of the radial bar 21a to perform a tilting operation, and the latch portion 21b is rotated when the lens holder cover 21 is tilted. It will play a role.

도 4는 본 발명에서 사용되는 렌즈홀더 베이스부에 렌즈홀더 덮개부가 결합된 구조를 설명하기 위한 도면이다.4 is a view for explaining a structure in which the lens holder cover portion is coupled to the lens holder base portion used in the present invention.

도 4에 도시된 바와 같이, 상기 렌즈홀더 베이스부(22)의 하부에는 틸팅 동작시 자기장을 형성하기 위하여 상기 레디얼 요크(36)와 마그네트(35)가 배치되어 있고, 상기 렌즈홀더 베이스부(22)의 상부에는 상기 대물렌즈가 안착되어 있는 상기 렌즈홀더 덮개부(21)가 결합되어 있다.As shown in FIG. 4, the radial yoke 36 and the magnet 35 are disposed under the lens holder base part 22 to form a magnetic field during the tilting operation. The lens holder base part 22 is disposed. The lens holder cover portion 21 on which the objective lens is mounted is coupled to the upper portion of the lens.

또한, 상기 렌즈홀더 덮개부(21)의 양측 가장자리의 레디얼 바(21a)는 상기 렌즈홀더 베이스부(22) 내부에 삽입되어 상기 레디얼 요크(36) 및 마그네트(35)와 일정거리를 유지하고 있다. 그리고, 상기 렌즈홀더 덮개부(21)의 걸쇠부(21b)는 상기 렌즈홀더 베이스부(22)의 걸쇠홈에 결합되어 틸팅 동작시 좌우로 회전할 수 있다.In addition, the radial bars 21a at both edges of the lens holder cover portion 21 are inserted into the lens holder base portion 22 to maintain a constant distance from the radial yoke 36 and the magnet 35. . In addition, the clasp 21b of the lens holder cover 21 may be coupled to the clasp groove of the lens holder base 22 to rotate left and right during a tilting operation.

도 5는 본 발명에 따른 틸팅 동작을 설명하기 위한 도면으로서, 광디스크에 기구적 휨이 발생한 경우에는 상기 대물렌즈를 휜 각도만큼 틸팅을 시켜주어야 하는데, 본 발명에서는 상기 렌즈홀더 덮개부 만이 일정 각도만큼 회전하고, 상기 렌즈홀더 베이스부는 회전하지 않는다.5 is a view for explaining a tilting operation according to the present invention. When mechanical bending occurs in an optical disc, the objective lens should be tilted by an angle of 휜. In the present invention, only the lens holder cover part has a predetermined angle. Rotate the lens holder base portion does not rotate.

도 6은 본 발명에 따른 틸팅 동작후 포커싱 동작을 설명하기 위한 도면으로서, 상기 렌즈홀더 덮개부가 일정 각도 틸팅된 상태에서 상기 렌즈홀더 베이스부에 배치된 포커싱 코일에 의하여 상하 포커싱 동작을 하게 된다. 즉, 포커싱과 트래킹동작은 상기 렌즈홀더 베이스부에 고정된 와이어 스프링에 의하여 동작하고, 틸팅 동작은 상기 렌즈홀더 덮개부에 고정된 레디얼 와이어 스프링에 의하여 동작함으로써, 틸팅 동작 후 포커싱 동작을 하여도 틸팅 동작이 포커싱 와이어 스프링에 영향을 주지 않았기 때문에 틸팅 할 때의 각도를 그대로 유지하여 크로스 토크를 방지할 수 있다.6 is a view for explaining a focusing operation after the tilting operation according to the present invention, the upper and lower focusing operation is performed by a focusing coil disposed in the lens holder base portion in a state that the lens holder cover portion is tilted at an angle. That is, the focusing and tracking operations are operated by a wire spring fixed to the lens holder base part, and the tilting operation is operated by a radial wire spring fixed to the lens holder cover part, thereby tilting even after focusing operation. Since the movement did not affect the focusing wire spring, the angle at tilting can be maintained to prevent cross talk.

이상에서 자세히 설명된 바와 같이, 본 발명은 액츄에이터에서 사용하는 렌즈홀더 부분을 덮개부와 베이스부로 분리한 다음, 트래킹 및 포커싱 동작과 레디얼 방향의 틸팅 동작을 각각 다른 와이어 스프링에 의하여 동작하도록 하여 틸팅 동작과 포커싱 및 트래킹 동작을 동시에 할 때 발생하던 크로스 토크를 방지한 효과가 있다.As described in detail above, the present invention separates the lens holder portion used in the actuator into the cover portion and the base portion, and then the tracking and focusing operation and the tilting operation in the radial direction are operated by different wire springs, respectively. And crosstalk that occurred when both focusing and tracking operations are performed at the same time.

아울러, 틸팅 구동부를 분리함으로써 틸팅 동작에 사용되던 구동 전류의 크기를 낮추어 전력 소모를 줄일 수 있는 이점이 있다.In addition, the separation of the tilting driver lowers the magnitude of the driving current used for the tilting operation, thereby reducing power consumption.

본 발명은 상기한 실시 예에 한정되지 않고, 이하 청구 범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능할 것이다.The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (4)

광기록 매체에 레이저 광원을 집광하는 대물렌즈를 안착시킨 렌즈홀더;A lens holder on which an objective lens for condensing a laser light source is mounted on an optical recording medium; 상기 대물렌즈의 구동을 위한 자기회로부 및 상기 렌즈홀더를 지지하기 위해 렌즈홀더의 양측에 형성된 지지수단을 포함하며, 상기 렌즈홀더는 독립된 틸팅 구동이 가능하도록 분할되어 있는 것을 특징으로 하는 광픽업 액츄에이터.And a support means formed on both sides of the lens holder to support the magnetic circuit unit for driving the objective lens and the lens holder, wherein the lens holder is divided to enable independent tilting driving. 제 1 항에 있어서,The method of claim 1, 상기 분할된 양측 렌즈홀더의 내측에 형성된 레디얼 틸팅 구동을 위한 자가 회로계를 더 포함하는 것을 특징으로 하는 광픽업 액츄에이터.The optical pickup actuator further comprises a self-circuit system for radial tilting driving formed inside the divided lens holders. 제 1 항에 있어서,The method of claim 1, 상기 지지수단은 레디얼 틸팅을 위한 지지수단을 추가로 구비함을 특징으로 하는 광픽업 액츄에이터.The support means is an optical pickup actuator, characterized in that further comprises a support means for radial tilting. 제 1 항에 있어서,The method of claim 1, 상기 분할된 렌즈홀더는 소정의 걸림수단에 의해 연결되는 것을 특징으로 하는 광픽업 액츄에이터.And said divided lens holder is connected by a predetermined locking means.
KR1020010081268A 2001-12-19 2001-12-19 Optical pick-up actuator KR20030050753A (en)

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