KR19980019661U - Objective lens drive - Google Patents

Objective lens drive Download PDF

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Publication number
KR19980019661U
KR19980019661U KR2019960032828U KR19960032828U KR19980019661U KR 19980019661 U KR19980019661 U KR 19980019661U KR 2019960032828 U KR2019960032828 U KR 2019960032828U KR 19960032828 U KR19960032828 U KR 19960032828U KR 19980019661 U KR19980019661 U KR 19980019661U
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South Korea
Prior art keywords
objective lens
coil
focusing
tracking coil
base member
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KR2019960032828U
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Korean (ko)
Inventor
유병열
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김광호
삼성전자 주식회사
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Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR2019960032828U priority Critical patent/KR19980019661U/en
Publication of KR19980019661U publication Critical patent/KR19980019661U/en

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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372Lenses
    • G11B7/1374Objective lenses
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • G11B7/0925Electromechanical actuators for lens positioning
    • G11B7/093Electromechanical actuators for lens positioning for focusing and tracking

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

소형 경량화에 유리하도록 그 구조가 개선된 대물렌즈 구동장치에 대해 개시한다. 개시된 대물렌즈 구동장치는, 트래킹코일과 포커싱코일이 구동체의 외주에 중첩되게 고정되어, 영구자석의 자기력이 그 포커싱코일 및 트래킹코일의 수직방향으로 동시에 작용되도록 된 것을 특징으로 한다.Disclosed is an objective lens driving apparatus whose structure is improved to be advantageous in miniaturization and light weight. The disclosed objective lens driving device is characterized in that the tracking coil and the focusing coil are fixed to overlap the outer circumference of the driving body so that the magnetic force of the permanent magnet is simultaneously acted in the vertical direction of the focusing coil and the tracking coil.

Description

대물렌즈 구동장치Objective lens drive

본 고안은 대물렌즈 구동장치에 관한 것으로서, 특히 소형 경량화에 유리하도록 그 구조가 개선된 대물렌즈 구동장치에 관한 것이다.The present invention relates to an objective lens driving apparatus, and more particularly, to an objective lens driving apparatus whose structure is improved to be advantageous for small size and light weight.

일반적으로 LDP(Laser Disk Player), CDP(Compact Disk Player)등 광기록매체(예컨대 광디스크)를 이용한 각각의 기록재생기기에는, 레이저 등의 광빔을 디스크면에 주사하고, 그 디스크로부터 반사되는 광빔을 검출하는 광픽업 유니트가 설치되어 있다. 이 광픽업 유니트는, 광빔을 대물렌즈를 통해 디스크면에 주사하여 그로부터 반사되는 빔을 2진신호로 읽어나가게 된다. 그러므로 이와 같은 광픽업 유니트는, 신호의 올바른 판독을 위해, 상기 대물렌즈와 디스크간의 일정 거리 즉, 초점이 정확히 맞춰져야 하며, 또한 주사된 광빔이 디스크상에 형성된 트랙(track)을 정확히 쫓아갈 수 있어야 잡음없는 정밀한 재생이 가능하게 된다. 여기서 전자를 포커싱(focusing)동작, 후자를 트래킹(tracking)동작이라 한다.In general, in each recording / reproducing apparatus using an optical recording medium (e.g., an optical disk) such as an LDP (Laser Disk Player) and a CDP (Compact Disk Player), a light beam such as a laser is scanned onto a disk surface, and the light beam reflected from the disk is scanned. An optical pickup unit for detecting is provided. The optical pickup unit scans the light beam through the objective lens onto the disk surface and reads the beam reflected therefrom as a binary signal. Therefore, such an optical pickup unit must have a certain distance, i.e., focus, accurately between the objective lens and the disk for correct reading of the signal, and must also be able to accurately follow the track formed on the disk with the scanned light beam. Accurate playback without noise is possible. The former is referred to as a focusing operation and the latter as a tracking operation.

따라서 광픽업 유니트에는, 상기 대물렌즈를 구동시키면서 상기한 포커싱 및 트래킹동작을 수행하기 위해, 도 1에 도시된 바와 같은 대물렌즈 구동장치가 채용되고 있다.Therefore, in the optical pickup unit, the objective lens driving device as shown in Fig. 1 is employed to perform the above focusing and tracking operation while driving the objective lens.

도면을 참조하면, 먼저 대물렌즈(1)가 탑재된 구동체(2)가 베이스부재(5)에 고정된 샤프트(7)에 이동가능하게 설치된다. 그리고 상기 구동체(2)의 측면에 한쌍의 철편(3)이 상호 대향되게 설치되고, 그 구동체(2)의 외주면에는 포커싱코일(4a) 및 트래킹코일(4b)이 각각 대향되게 쌍을 이루며 마련되어 있는 링부재(9)가 끼워진다. 또한 상기 베이스부재(5)에는 자계를 형성하는 요크(yoke;6)가 마련되며, 그 요크(6)에 두 쌍의 영구자석(8a,8b)이 고정지지된다. 그리고 이 두 쌍의 영구자석(8a,8b)도 상기 포커싱코일(4a)과 트래킹코일(4b)에 각각 한 쌍씩 대응되게 배치된다.Referring to the drawings, first, the drive body 2 on which the objective lens 1 is mounted is movably installed on the shaft 7 fixed to the base member 5. In addition, a pair of iron pieces 3 are installed to face each other on the side of the driving body 2, and the focusing coil 4a and the tracking coil 4b are paired to face each other on the outer circumferential surface of the driving body 2, respectively. The provided ring member 9 is fitted. In addition, the base member 5 is provided with a yoke 6 that forms a magnetic field, and two pairs of permanent magnets 8a and 8b are fixed to the yoke 6. The pair of permanent magnets 8a and 8b are also arranged to correspond to the focusing coil 4a and the tracking coil 4b, respectively.

이와 같은 구조에 있어서, 상기 영구자석(8a,8b)의 자력에 의해 상기 구동체(2)에 부착된 철편(3)에 흡인력이 작용되고 있고, 초기에 그 흡인력의 평형에 의해 상기 구동체(2)가 도면의 z방향 및 θ방향으로 균형을 유지하고 있게 된다.In such a structure, a suction force is applied to the iron piece 3 attached to the drive body 2 by the magnetic force of the permanent magnets 8a and 8b, and initially the balance of the suction force causes the drive body ( 2) is balanced in the z-direction and θ-direction of the drawing.

이 상태에서 외부로부터 구동전류가 인가되어 상기 포커싱코일(4a)과 트래킹코일(4b)에 선택적으로 전류가 흐르게 되면, 그 전류와 상기 영구자석(8a,8b)의 자력과의 상호작용으로 플레밍의 왼손법칙에 따르는 전자기력이 발생된다. 따라서 이 전자기력이 작용하는 방향에 따라 상기 구동체(2)가 도면의 z방향 또는 θ방향으로 이동되게 되는 것이다.In this state, when a drive current is applied from the outside and a current flows selectively through the focusing coil 4a and the tracking coil 4b, the current is interacted with the magnetic force of the permanent magnets 8a and 8b. The electromagnetic force is generated according to the left hand law. Therefore, the driving body 2 is moved in the z direction or the θ direction of the drawing according to the direction in which the electromagnetic force acts.

그런데 이와 같은 구조의 대물렌즈 구동장치는, 전자기력을 발생시키기 위한 영구자석(8a,8b)이 두 쌍 즉, 4개가 필요하며, 포커싱코일(4a) 및 트래킹코일(4b)이 고정되는 별도의 링부재(9)가 구비되어야 하므로, 제품의 경량화에 불리하며 부품수가 많아지는 문제점이 있다.However, the objective lens driving device having such a structure requires two pairs, that is, four permanent magnets 8a and 8b for generating electromagnetic force, and separate rings to which the focusing coil 4a and the tracking coil 4b are fixed. Since the member 9 must be provided, there is a problem in that the weight of the product is disadvantageous and the number of parts increases.

본 고안은 상기의 문제점을 해결하기 위해 창출된 것으로서, 부품수를 감소시키고, 제품의 경량화에 유리하도록 그 구조가 개선된 대물렌즈 구동장치를 제공하는데 목적이 있다.The present invention was created to solve the above problems, and an object of the present invention is to provide an objective lens driving apparatus whose structure is improved to reduce the number of parts and to be advantageous in weight reduction of the product.

도 1은 종래의 대물렌즈 구동장치를 나타낸 분리사시도,1 is an exploded perspective view showing a conventional objective lens driving device,

도 2는 본 고안에 따른 대물렌즈 구동장치를 나타낸 분리사시도,2 is an exploded perspective view showing the objective lens driving apparatus according to the present invention,

도 3은 본 고안에 따른 대물렌즈 구동장치의 전자기 흐름을 개념적으로 나타낸 개념도.3 is a conceptual diagram conceptually showing the electromagnetic flow of the objective lens driving apparatus according to the present invention.

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

10...대물렌즈20...구동체10.Objective lens 20.Driver

30...철편41...포커싱코일30.Steel piece 41.Focusing coil

42...트래킹코일50...베이스부재42.Tracking coil 50.Base member

60...요크70...샤프트60.York 70.Shaft

80...영구자석I1,I2...전류80 Permanent magnet I1, I2 Current

B...자기력선B ... magnetic line

상기의 목적을 달성하기 위한 본 고안은, 베이스부재와, 상기 베이스부재에 수직이동 및 회전가능하게 설치되며 대물렌즈가 탑재되는 구동체와, 상기 구동체의 외주에 설치되어 구동전류가 통전되는 포커싱코일 및 트래킹코일과, 상기 구동체의 측면에 서로 대향되게 설치된 복수의 철편 및 상기 베이스부재에 마련된 요크에 고정되어 상기 구동전류와 함께 전자기력을 발생시키는 복수의 영구자석을 포함하여 된 대물렌즈 구동장치에 있어서, 상기 포커싱코일과 상기 트래킹코일이 상기 구동체의 외주에 중첩되게 고정되어, 상기 영구자석의 자기력이 상기 포커싱코일 및 트래킹코일의 수직방향으로 동시에 작용되도록 된 것을 특징으로 한다.The present invention for achieving the above object, the base member, the drive member is installed to the vertical movement and rotatable to the base member and the objective lens is mounted, the focusing is installed on the outer periphery of the drive body is energized drive current An objective lens driving device including a coil and a tracking coil, and a plurality of permanent magnets fixed to the yoke provided in the base member and a plurality of iron pieces provided opposite to each other on the side of the driving body to generate an electromagnetic force together with the driving current. The focusing coil and the tracking coil are fixed to overlap the outer circumference of the driving body, so that the magnetic force of the permanent magnet is simultaneously acted in the vertical direction of the focusing coil and the tracking coil.

이하 첨부된 도면을 참조하면서, 본 고안에 따른 바람직한 실시예를 상세히 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 고안에 따른 대물렌즈 구동장치를 나타낸다.2 shows an objective lens driving apparatus according to the present invention.

도면을 참조하면, 본 고안의 대물렌즈 구동장치도 통상의 구동장치와 같이, 대물렌즈(10)가 탑재된 구동체(20)가 베이스부재(50)에 고정된 샤프트(70)에 이동가능하게 설치되고, 그 구동체(20)의 측면에 한 쌍의 철편(30)이 상호 대향되게 설치되어 있다. 이 철편(30)은 통상 자성이 좋은 재료로 만들어지며, 영구자석(80)에서 발생되는 자력에 대해 밸런스를 유지하여 구동체(20)의 초기 위치를 유지시킴과 동시에, 상기 구동체(20)가 소정방향으로 움직였을 때, 상기 자력에 의해 다시 원위치로 되돌아오는 복원력을 제공하는 기능을 한다.Referring to the drawings, the objective lens driving device of the present invention, like a conventional driving device, the drive body 20 on which the objective lens 10 is mounted is movable to the shaft 70 fixed to the base member 50. A pair of iron pieces 30 are provided on the side surface of the drive body 20 so as to face each other. The iron piece 30 is usually made of a good magnetic material, maintains the initial position of the drive body 20 by maintaining a balance against the magnetic force generated in the permanent magnet 80, and at the same time, the drive body 20 When is moved in a predetermined direction, and serves to provide a restoring force to return to the original position by the magnetic force.

여기서 본 고안의 특징적 요소로서, 먼저 상기 구동체(20)의 외주면에 포커싱코일(41)이 감겨있고, 그 포커싱코일(41)에 트래킹코일(42)이 중첩되게 배치되어 있다. 이를 도3 에 개략적으로 도시하였다. 또한 이 베이스부재(50)에 마련된 요크(60)에 한 쌍의 영구자석(80)이 상호 대향되게 고정된다. 즉, 이 한 쌍의 영구자석(80)이 상기 포커싱코일(41)과 트래킹코일(42)에 수직되는 방향으로 동시에 자력을 작용하게 된다.As a characteristic element of the present invention, the focusing coil 41 is wound around the outer circumferential surface of the driving body 20, and the tracking coil 42 is disposed on the focusing coil 41. This is schematically shown in FIG. In addition, a pair of permanent magnets 80 are fixed to the yoke 60 provided in the base member 50 to face each other. That is, the pair of permanent magnets 80 simultaneously exert a magnetic force in a direction perpendicular to the focusing coil 41 and the tracking coil 42.

따라서 도 3에 도시된 바와 같이, 영구자석(80)에 의한 자기력선(B)의 방향과, 포커싱코일(41) 또는 트래킹코일(42)에 통전되는 전류(I1,I2)의 방향이 각각 수직을 이루게되고, 이에 따라 도면의 F1 또는 F2방향으로 플레밍의 왼손법칙에 해당하는 구동력이 작용하게 되는 것이다. 이와 같은 구동력에 의해 상기 구동체(20)는 도 2의 Z방향 및/또는 θ방향으로 구동되면서 포커싱과 트래킹동작을 수행하게 된다.Therefore, as shown in FIG. 3, the direction of the magnetic force line B by the permanent magnet 80 and the direction of the currents I1 and I2 energized by the focusing coil 41 or the tracking coil 42 are perpendicular to each other. As a result, a driving force corresponding to Fleming's left hand law acts in the direction of F1 or F2 of the drawing. By this driving force, the driving body 20 is driven in the Z direction and / or θ direction of FIG. 2 to perform the focusing and tracking operations.

한편 이와 같은 포커싱코일(41)과 트래킹코일(42)을 인쇄회로기판(PCB) 형태로 서로 중첩되게 제작하여 상기 구동체(20)의 외주면 일측에 부착시킴으로써 상기 영구자석(80)의 자기력선(B)이 동시에 작용되게 할 수도 있다.Meanwhile, the focusing coil 41 and the tracking coil 42 are manufactured to overlap each other in the form of a printed circuit board (PCB) and attached to one side of the outer circumferential surface of the driving body 20 so that the magnetic field lines B of the permanent magnet 80 ) Can be operated at the same time.

그러므로 상기한 바와 같이 한 쌍의 영구자석(80)이 상기 포커싱코일(41)과 트래킹코일(42)에 동시에 자기력을 작용시킬 수 있으므로, 그 코일들(41,42)에 각각 대응되는 별도의 영구자석은 필요하지 않게 된다.Therefore, as described above, since the pair of permanent magnets 80 can simultaneously apply magnetic force to the focusing coil 41 and the tracking coil 42, separate permanent magnets corresponding to the coils 41 and 42, respectively. No magnet is needed.

본 고안에 따른 대물렌즈 구동장치는, 포커싱 및 트래킹동작을 한 쌍의 영구자석으로 수행할 수 있고, 구동체의 외주에 끼워지는 별도의 링부재가 필요없게 되므로, 부품수를 절감할 수 있으며 제품의 경량화에 유리한 잇점을 가진다.The objective lens driving apparatus according to the present invention can perform a focusing and tracking operation as a pair of permanent magnets, and does not require a separate ring member fitted to the outer circumference of the driving body, thereby reducing the number of parts and the product. It is advantageous in terms of weight reduction.

Claims (1)

베이스부재와, 상기 베이스부재에 수직이동 및 회전가능하게 설치되며 대물렌즈가 탑재되는 구동체와, 상기 구동체의 외주에 설치되어 구동전류가 통전되는 포커싱코일 및 트래킹코일과, 상기 구동체의 측면에 서로 대향되게 설치된 복수의 철편 및 상기 베이스부재에 마련된 요크에 고정되어 상기 구동전류와 함께 전자기력을 발생시키는 복수의 영구자석을 포함하여 된 대물렌즈 구동장치에 있어서,A base member, a driving body mounted on the base member so as to be vertically movable and rotatable, and having an objective lens mounted thereon; a focusing coil and a tracking coil installed on an outer circumference of the driving body to energize driving current; and a side surface of the driving body. In the objective lens driving apparatus comprising a plurality of permanent magnets that are fixed to the yoke provided on the base member and a plurality of iron pieces provided opposite to each other to generate an electromagnetic force with the drive current, 상기 트래킹코일과 상기 포커싱코일이 상기 구동체의 외주에 중첩되게 고정되어, 상기 영구자석의 자기력이 상기 포커싱코일 및 트래킹코일의 수직방향으로 동시에 작용되도록 된 것을 특징으로 하는 대물렌즈 구동장치.And the tracking coil and the focusing coil are fixed to overlap the outer circumference of the driving body so that the magnetic force of the permanent magnet is simultaneously acted in the vertical direction of the focusing coil and the tracking coil.
KR2019960032828U 1996-10-05 1996-10-05 Objective lens drive KR19980019661U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100941532B1 (en) * 2002-03-26 2010-02-10 파나소닉 주식회사 Objective lens driving unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100941532B1 (en) * 2002-03-26 2010-02-10 파나소닉 주식회사 Objective lens driving unit

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