KR0126627B1 - Suspension light disk player actuator - Google Patents
Suspension light disk player actuatorInfo
- Publication number
- KR0126627B1 KR0126627B1 KR1019940018854A KR19940018854A KR0126627B1 KR 0126627 B1 KR0126627 B1 KR 0126627B1 KR 1019940018854 A KR1019940018854 A KR 1019940018854A KR 19940018854 A KR19940018854 A KR 19940018854A KR 0126627 B1 KR0126627 B1 KR 0126627B1
- Authority
- KR
- South Korea
- Prior art keywords
- suspension
- objective lens
- tracking
- focusing
- optical pickup
- Prior art date
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Classifications
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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
- G11B7/0933—Details of stationary 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
제1도는 종래의 일예에 따른 광픽업장치의 사시도,1 is a perspective view of an optical pickup apparatus according to a conventional example,
제2도는 종래의 다른 예에 따른 광픽업장치의 사시도,2 is a perspective view of an optical pickup apparatus according to another conventional example,
제3도는 본 발명에 따른 광픽업엑츄에이터의 서스펜션(Suspension)의 분리사시도,3 is an exploded perspective view of a suspension of an optical pickup actuator according to the present invention;
제4도는 제3도에 도시된 광픽업엑츄에이터의 서스펜션의 요부확대 분리사시도,4 is an enlarged exploded perspective view of the main portion of the suspension of the optical pickup actuator shown in FIG.
제5도는 본 발명에 따른 광디스크플레이어용 광픽업엑츄에이터의 서스펜션의 결합상태를 나타낸 요부측단면도이다.5 is a main sectional side view showing the coupling state of the suspension of the optical pickup actuator for an optical disc player according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
40 : 서스펜션 42 : 대물렌즈홀더40: suspension 42: objective lens holder
44 : 포커싱방향조정 50 : 트랙킹방향조정부재44: focusing direction adjustment 50: tracking direction adjustment member
52 : 서스펜션 설치공 54 : 웨이트밸런서(Weight Balancer)52: suspension installation worker 54: weight balancer
56 : 대물렌즈 58 : 절곡부56: objective lens 58: bent portion
본 발명은 광디스크플레이어용 광픽업엑츄에이터(Actuator)의 서스펜션에 관한 것으로, 보다 상세하게는 대물렌즈의 포커싱방향운동과 크랙킹방향운동이 그 포커싱/트랙킹운동방향과는 다른 방향으로 부터 외란이 작용되더라도 그 포커싱/트랙킹운동방향의 자유도에 의하여 정확히 수행될 수 있도록 한 개량된 단순한 구조를 갖는 광디스크플레이어용 광픽업엑츄에이터의 서스펜션에 관한 것이다.The present invention relates to a suspension of an optical pickup actuator for an optical disc player. More specifically, the focusing and cracking direction movements of an objective lens may be caused by disturbances from a direction different from the focusing / tracking direction. A suspension of an optical pick-up actuator for an optical disc player having an improved simple structure that can be performed accurately by the degree of freedom in the focusing / tracking movement direction.
일반적으로, 미니디스크플레이어(MDP)라던지 콤팩트디스크플레이어(CDP)나 레이저디스크플레이어(LDP)와 같은 광디스크플레이어에는 턴테이블에 얹혀져 회전되는 디스크의 수직하방에서 그 디스크의 래디얼방향으로 직선이동하면서 디스크 상의 원하는 트랙위치를 검출하고 그 검출된 트랙위치에서는 디스크면상에 형성된 기록피트(Pit)에 레이저광을 입사시킨 다음, 그 반사광을 광학계를 통하여 검출하며, 그 검출된 반사광을 일정한 신호로 변환시키는 방식으로 디스크면 상에 기록된 정보를 재생하는 리니어트랙킹방식의 광픽업엑츄에이터가 설치된다.In general, an optical disc player such as a mini disc player (MDP) or a compact disc player (CDP) or a laser disc player (LDP) is mounted on a turntable and moves linearly downward in the radial direction of the disc in the vertical direction of the rotating disc. By detecting a desired track position and injecting a laser beam into a recording pit formed on the disk at the detected track position, the reflected light is detected through an optical system, and the detected reflected light is converted into a constant signal. An optical pickup actuator of a linear tracking method for reproducing information recorded on the disk surface is provided.
그러한 종래의 일예에 따른 리니어트랙킹방식의 광픽업엑츄에이터(10)는 제1도에 도시된 바와 같이 중앙부에 레이저통과공이 형성된 베이스플레이트(12) 상에 상기 레이저통과공을 사이에 두고 전후방향으로 요크(14)가 설치되고, 그 요크(14)의 내측에는 영구자석(16)이 설치되는 한편, 상기 레이저통과공 상측에는 디스크의 기록면에 레이저광을 집속시키기 위한 대물렌즈(18)와 그 대물렌즈(18)를 잡아주는 대물렌즈홀더(20)가 동일축 상에 설치되며, 상기 대물렌즈홀더(20)의 전후방향 외측에는 정확한 트랙검출을 위한 상기 대물렌즈(18)의 래디얼방향으로의 움직임을 제어하는 트랙킹조정코일(22)이 설치됨과 더불어 그 좌우방향외측에는 디스크의 각편차(Angle Deviation) 및 편심도 등에 의하여 디스크와 광픽업 사이의 거리변화가 발생할 때 디스크의 반사면이 초점심도 내에 들어오도록 상기 대물렌즈(18)의 광축방향 움직임을 제어하는 포커싱 조정코일(24)이 설치되며, 상기 대물렌즈홀더(20)의 양측면에서 상기 대물렌즈(18)의 광축 및 래디얼방향으로의 요동을 지지해 줌과 동시에 외부로 부터의 충격작용시 그 진동을 감쇄시켜 주는 와이어 형태의 서스펜션(26)이 설치된 구조로 이루어 진다.The linear tracking optical pickup actuator 10 according to the conventional example has a yoke in the front-rear direction with the laser through hole interposed therebetween on a base plate 12 having a laser through hole formed in the center as shown in FIG. 1. (14) is provided, and a permanent magnet (16) is provided inside the yoke (14), and an objective lens (18) for focusing the laser light on the recording surface of the disk and the objective lens above the laser passing hole. An objective lens holder 20 for holding 18 is installed on the same axis, and the objective lens holder 20 moves forward and backward in the radial direction of the objective lens 18 for accurate track detection. The tracking adjustment coil 22 for controlling is installed, and the reflective surface of the disk when the distance change between the disk and the optical pickup occurs due to the angle deviation and the eccentricity of the disk on the left and right outside. A focusing adjustment coil 24 is installed to control the optical axis movement of the objective lens 18 so as to fall within the depth of focus, and the optical axis and the radial direction of the objective lens 18 are provided at both sides of the objective lens holder 20. It is made of a structure in which a wire-shaped suspension 26 is installed to support the swing of the furnace and to attenuate the vibration during the impact action from the outside.
그러나, 이와 같은 종래의 광픽업엑츄에이터의 서스펜션은 와이어의 구조적 특성상 및 트랙킹 조정시 정확히 2-방향의 자유도를 갖는 것이 아니라 모든 방향으로의 자유도를 갖게 됨에 따라 그 2-방향이외의 방향에서 외란이 작용하게 되면 회전병진운동이 발생하여 불안정하게 된다는 문제점이 있었다.However, the suspension of the conventional optical pick-up actuator does not have a degree of freedom in exactly two directions when adjusting the tracking and tracking, and thus has freedom in all directions, so that disturbances work in directions other than the two directions. There was a problem that the rotational translation occurs and become unstable.
그러한 점을 고려해서, 최근에는 제2도에 도시된 바와 같이 P.B.T(Poly Butylene Terephthalate)를 이용하여 대물렌즈홀더(20)의 몸체부에 결합된 상태에서 상.하방향으로 텐션운동하면서 대물렌즈(18)를 광축 방향으로 움직여주는 포커싱방향조정부재(28)와, 일단이 상기 포커싱방향조정부재(28)의 선단면에 부착되고, 타단이 대물렌즈홀더(20)의 몸체부에 결합된 상태에서 대물렌즈(18)를 래디얼방향으로 움직여 주는 트랙킹 방향조정부재(30)를 일체로 형성하여 된 광픽업엑츄에이터의 서스펜션(32)이 제안되어 사용되고 있다.In view of such a point, as shown in FIG. 2, the objective lens is tensioned in the up and down direction while being coupled to the body of the objective lens holder 20 using PBT (Poly Butylene Terephthalate). Focusing direction adjusting member 28 for moving 18 in the optical axis direction, one end is attached to the front end surface of the focusing direction adjusting member 28, the other end is coupled to the body portion of the objective lens holder 20 The suspension 32 of the optical pickup actuator, which is formed integrally with the tracking direction adjusting member 30 for moving the objective lens 18 in the radial direction, has been proposed and used.
그러나, 이와 같은 종래의 광픽업엑츄에이터의 서스펜션(32)은 비교적 외란에는 강하나 형상이 복잡하고 사출시 상기 트랙킹방향조정부재(30)에 형성된 힌지부가 끊어질 염려가 크다는 문제점이 있었다.However, the suspension 32 of the conventional optical pickup actuator is relatively strong in disturbance but complicated in shape, and there is a high possibility that the hinge portion formed on the tracking direction adjusting member 30 may be broken during injection.
본 발명은 이와 같은 종래의 문제점을 해결하기 위한 것으로, 그 목적은 대물렌즈의 포커싱방향운동과 트랙킹방향운동이 그 2-방향과는 다른 방향으로 부터의 외란이 작용되더라도 2-방향의 자유도에 의하여 정확히 수행될 수 있도록 하면서 단순한 구조를 갖는 새로운 형태의 광디스크플레이어용 광픽업엑츄에이터의 서스펜션을 제공하고자 하는 것이다.The present invention is to solve such a conventional problem, the object of the focusing direction and tracking direction movement of the objective lens by the degree of freedom in the two-way even if disturbance from the direction different from the two-way It is to provide a suspension of an optical pickup actuator for a new type of optical disc player having a simple structure while being able to be performed accurately.
상기한 목적을 달성하기 위해, 본 발명에 따르면은 탄성률이 양호한 얇은 플레이트의 길이방향 중심으로 부터 양쪽으로 일정거리 떨어진 지점에 절곡부를 형성한 다음, 각 절곡부 사이의 부분을 대물렌즈홀더의 선단내면에 부착하여 트랙킹방향조정부재로 구성하여, 상기 각 절곡부로 부터 연장되는 양단을 지지부재의 상하면에 부착하여 각절곡부와 양단 사이의 부분을 포커싱방향조정부재로 구성하여 된 특징을 갖는다.In order to achieve the above object, according to the present invention, the bent portions are formed at a predetermined distance to both sides from the longitudinal center of the thin plate having good elastic modulus, and then the portions between the bent portions are formed on the tip inner surface of the objective lens holder. And a tracking direction adjusting member attached to the upper and lower ends of the support member by attaching both ends extending from the respective bending sections to the focusing direction adjusting member.
이하, 첨부된 도면에 의하여 본 발명을 보다 상세히 설명하다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
제3도 및 제4도는 각각 본 발명에 따른 광픽업엑츄에이터의 서스펜션(40)이 대물렌즈홀더(42)로 부터 분리된 상태를 나타내는 분리사시도와 그 요부확대분리 사시도를 나타내는 바, 상기 서스펜션(40)을 구성하는 포커싱방향조정부재(44)의 하부 외측단과 상부외측단은 각각 베이스플레이트(46)의 상면에 설치되는 육면체형의 지지부재(48)의 하단면과 상단면에 고정설치되고, 트랙킹방향조정부재(50)의 전면은 대물렌즈홀더(42)의 몸체에 형성된 서스펜션설치공(52)의 내면 앞쪽에 형성된 결합홈(54)에 끼워져 결합된 상태에서 부착된 구조를 갖는다.3 and 4 respectively show an exploded perspective view showing the state in which the suspension 40 of the optical pickup actuator according to the present invention is separated from the objective lens holder 42, and the enlarged perspective view of the main portion thereof. The lower outer end and the upper outer end of the focusing direction adjusting member 44 constituting the () is fixed to the lower end and the upper end of the hexahedral support member 48 installed on the upper surface of the base plate 46, respectively, and tracking The front surface of the direction adjusting member 50 has a structure attached to the coupling groove 54 formed in the front of the inner surface of the suspension installation hole 52 formed in the body of the objective lens holder 42 in a coupled state.
그리고, 상기 서스펜션설치공(52)의 내부위치에서 상기 대물렌즈홀더(42)의 후방연장부 내측에 형성된 요홈(42a)에 대응하여 양측에 돌기(54a)가 형성된 웨이트밸런서(54)가 상기 서스펜션(40)의 내측에 끼워져 설치된다.In addition, a weight balanceer 54 having protrusions 54a formed on both sides corresponding to the groove 42a formed inside the rear extension part of the objective lens holder 42 at the inner position of the suspension installation hole 52 is the suspension. It is fitted inside the 40.
한편, 상기 서스펜션(40)을 구성하는 트랙킹방향조정부재(50)는 그 중심이 절곡부(58)의 양단보다 상당히 작은 폭을 갖도록 만곡지게 형성되며, 상기 포커싱방향조정부재(44)도 상기 절곡부(58)의 양단보다 작은 폭으로 형성된 구조를 갖게 된다.On the other hand, the tracking direction adjustment member 50 constituting the suspension 40 is formed to be curved so that the center thereof has a width considerably smaller than both ends of the bent portion 58, the focusing direction adjustment member 44 is also bent It has a structure formed with a width smaller than both ends of the portion 58.
이어, 상기한 구성의 본 발명에 따른 광디스크플레이어용 광픽업엑츄에이터의 서스펜션의 작용에 대해 설명한다.Next, the operation of the suspension of the optical pickup actuator for an optical disc player according to the present invention having the above-described configuration will be described.
제5도에 도시된 바와 같이, 본 발명에 따른 서스펜션(40)이 대물렌즈홀더(42)에 결합설치된 상태에서 디스크를 플레이어에 삽입하여 작동시키게 되면 광픽업엑츄에이터가 디스크의 수직하방에서 래디얼방향으로 직선이동되면서 디스크 상에 기록된 정보를 재생시키게 된다.As shown in FIG. 5, when the disk 40 is inserted into the player while the suspension 40 according to the present invention is coupled to the objective lens holder 42, the optical pick-up actuator moves in the radial direction from the vertical downward of the disk. It linearly moves to reproduce the information recorded on the disc.
이때, 디스크의 각 편차 및 편심도 등에 의해 디스크와 광픽업엑츄에이터 사이의 거리가 일정하게 유지되지 않고 계속해서 변하게 되며, 이렇게 발생되는 변화량은 광학계에서 포커스에러로 검출되어 포커스서보시스템을 작동시켜 대물렌즈(56)를 초점심도 내에 들어오도록 하는 제어가 수행된다. 이 때, 주지의 방식으로 포커싱코일에 인가되는 포커싱전위에 의한 전자기적(電磁氣的)인 작용에 의한 대물렌즈(56)의 광축방향 움직임은 베이스플레이트(46)에 고정설치되는 지지부재(48)에 의해 지지된 상태에서 상기 포커싱코일에 의한 전자기적인 작용에 의해 상기 서스펜션(40) 전체가 상하방향 휘어지는 작용에 의거하여 상하방향으로 자유도를 갖는 포커싱방향조정부재(44)에 의해서 행해지게 된다.At this time, the distance between the disk and the optical pickup actuator is not kept constant due to each deviation and eccentricity of the disk. The change amount is detected as a focus error in the optical system and the focus servo system is operated to operate the objective lens. Control is made to bring 56 into the depth of focus. At this time, the optical axis movement of the objective lens 56 due to the electromagnetic action of the focusing potential applied to the focusing coil in a known manner is supported by the support member 48 fixed to the base plate 46. The suspension 40 is performed by the focusing direction adjusting member 44 having the degree of freedom in the vertical direction based on the action of bending the whole suspension 40 in the vertical direction by the electromagnetic action of the focusing coil.
즉, 상기 서스펜션(40)에 내재되는 웨이트밸런서(54)의 측면에 형성된 돌기(54a)가 상기 대물렌즈홀더(42)의 후방연장부 내측에 형성된 요홈(42a)에 끼워진 상태에서 상기 서스펜션(40)의 포커싱방향조정부재(44)가 포커싱코일의 전자기적인 작용에 의해 상하방향으로 요동하게 되면 상기 서스펜션(40)의 내측에 개재되는 상기 웨이트밸런서(54)의 상하 요동력에 의해 상기 대물렌즈홀더(42)도 요홈(42a)부분을 통해 전달되는 요동력에 의해 상하방향으로 요동하게 되고, 그에 따라 상기 대물렌즈(56)가 광축방향으로 변위조정되게 된다.That is, the suspension 40 in the state in which the protrusion 54a formed on the side of the weight balancer 54 embedded in the suspension 40 is fitted in the groove 42a formed inside the rear extension of the objective lens holder 42. When the focusing direction adjusting member 44 of the c) swings in the vertical direction by the electromagnetic action of the focusing coil, the objective lens holder is moved by the vertical swing force of the weight balancer 54 interposed inside the suspension 40. Also, 42 is oscillated in the vertical direction by the oscillation force transmitted through the recess 42a, so that the objective lens 56 is displaced and adjusted in the optical axis direction.
한편, 상기 대물렌즈(56)의 트랙킹방향조정은 상기 포커싱방향조정부재(44)의 선단 상하방에서 절곡되어 대물렌즈홀더(52) 상의 서스펜션설치공(52)의 내측면 앞쪽에 결합된 상태에서 좌우방향의 자유도를 갖는 트랙킹방향조정부재(50)에 의하여 이루어지는 바, 광학계에서 검출한 트랙킹에러 신호의 인가에 의하여 트랙킹서보시스템이 작동되면 자계 중에 놓여 있는 트랙킹조정코일이 주지된 바와 같이 래디얼방향으로 요동하게 되며, 그에 따라 상기 트랙킹방향조정부재(50)와 결합된 대물렌즈홀더(42)가 그 트랙킹방향조정부재(50)의 중심부를 힌지점으로 하여 좌우로 요동되고, 그 결과 대물렌즈(56)의 트랙킹조정이 이루어지게 된다.On the other hand, the tracking direction adjustment of the objective lens 56 is bent at the top and bottom of the front end of the focusing direction adjustment member 44 in a state coupled to the front of the inner surface of the suspension mounting hole 52 on the objective lens holder 52 When the tracking servo system is operated by the application of the tracking error signal detected by the optical system, the tracking adjustment coil lying in the magnetic field is operated in the radial direction as is well known. As a result, the objective lens holder 42 coupled with the tracking direction adjusting member 50 is swung left and right with the hinge point as the hinge point, and as a result, the objective lens 56 ) Tracking adjustment is made.
따라서, 상기한 구성을 갖는 본 발명에 따르면, 서스펜션이 광축방향의 자유도를 갖는 포커싱방향조정부재와 래디얼방향의 자유도를 갖는 트랙킹방향조정부재로 구성되기 때문에 작용방향외의 방향에서 외란이 작용한다 하더라도 정확한 위치조정이 가능하다는 효과가 있으며, 얇은 플레이트를 절곡하는 간단한 동작에 의하여 제조가 이루어지므로 구조 및 생산과정이 단순하여 작업성 및 생산성이 향상된다는 효과가 있다.Therefore, according to the present invention having the above-described configuration, since the suspension is composed of a focusing direction adjusting member having a degree of freedom in the optical axis direction and a tracking direction adjusting member having a degree of freedom in the radial direction, even if disturbance acts in a direction other than the operating direction, There is an effect that the position can be adjusted, the manufacturing is made by a simple operation of bending the thin plate has a simple structure and production process has the effect of improving workability and productivity.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940018854A KR0126627B1 (en) | 1994-07-30 | 1994-07-30 | Suspension light disk player actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940018854A KR0126627B1 (en) | 1994-07-30 | 1994-07-30 | Suspension light disk player actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960005477A KR960005477A (en) | 1996-02-23 |
| KR0126627B1 true KR0126627B1 (en) | 1998-04-01 |
Family
ID=19389505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019940018854A KR0126627B1 (en) | 1994-07-30 | 1994-07-30 | Suspension light disk player actuator |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0126627B1 (en) |
-
1994
- 1994-07-30 KR KR1019940018854A patent/KR0126627B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR960005477A (en) | 1996-02-23 |
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