KR970000644B1 - Suspension of optical pick up actuator - Google Patents
Suspension of optical pick up actuator Download PDFInfo
- Publication number
- KR970000644B1 KR970000644B1 KR1019940003667A KR19940003667A KR970000644B1 KR 970000644 B1 KR970000644 B1 KR 970000644B1 KR 1019940003667 A KR1019940003667 A KR 1019940003667A KR 19940003667 A KR19940003667 A KR 19940003667A KR 970000644 B1 KR970000644 B1 KR 970000644B1
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- South Korea
- Prior art keywords
- tracking
- objective lens
- suspension
- adjusting member
- focusing
- Prior art date
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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
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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
Abstract
Description
제1도는 종래 광픽업장치의 사시도.1 is a perspective view of a conventional optical pickup device.
제2도는 종래 다른 실시예에 따른 광픽업엑츄에이터의 세스펜션(Suspension)의 분리사시도.2 is an exploded perspective view of a suspension of an optical pickup actuator according to another exemplary embodiment.
제3도는 본 발명에 따른 광픽업엑츄에이터의 서스펜션의 분리사시도.Figure 3 is an exploded perspective view of the suspension of the optical pickup actuator according to the present invention.
제4도는 제3도의 결합상태 사시도.4 is a perspective view of the engaged state of FIG.
제5도는 본 발명의 작동상태 사시도로서, (a)는 대물렌즈의 트랙킹방향조정시 운동방향을 나타내는 서스펜션의 사시도, (b)는 대물렌즈의 포커싱방향조정시 운동방향을 나타내는 서스펜션의 사시도이다.5 is a perspective view of an operating state of the present invention, (a) is a perspective view of the suspension indicating the movement direction when the tracking direction of the objective lens adjustment, (b) is a perspective view of the suspension indicating the movement direction when the focusing direction adjustment of the objective lens.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
50 : 서스펜션 54 : 지지부재50: suspension 54: support member
64 : 포커싱방향조정부재 76 : 트랙킹방향조정부재64: focusing direction adjusting member 76: tracking direction adjusting member
78 : 고정축 80 : 날개부78: fixed shaft 80: wing
본 발명은 광디스크플레이어용 광픽업엑츄에이터(Actuator)의 서스펜션에 관한 것으로, 보다 상세하게는 대물렌즈의 포커싱방향운동과 트랙킹방향운동이 운동방향이외의 방향으로부터 외란이 작동되더라도 각각 두방향 자유도에 의하여 정확히 수행될 수 있도록 하고, 포커싱조정코일, 트랙킹조정코일과 메인인쇄회로기판사이의 전기적 연결이 별도의 보조인쇄회로기판없이도 간단히 이루어질 수 있도록 한 광디스크플레이어용 광픽업엑튜에이터의 서스펜션에 관한 것이다.The present invention relates to a suspension of an optical pickup actuator for an optical disc player, and more specifically, even if the focusing direction movement and the tracking direction movement of the objective lens are disturbed from a direction other than the movement direction, respectively, precisely by two degrees of freedom. The invention relates to a suspension of an optical pickup actuator for an optical disc player that can be performed and that the electrical connection between the focusing adjustment coil, the tracking adjustment coil and the main printed circuit board can be made simply without a separate auxiliary printed circuit board.
일반적으로, 미니디스크플레이어(MDP), 콤팩트디스크플레이어(CDP)나 레이저디스크플레이어(LDP)같은 각종 광디스크플레이어에는 턴테이블에 얹혀져 회전되는 디스크의 수직하방에서 그 디스크의 래디얼방향으로 직선이동하면서 디스크상의 원하는 트랙위치를 검출하고, 검출된 트랙위치에서는 디스크면상에 형성된 기록피트(Pit)에 레이저광을 입사시킨 다음, 그 반사광을 광학계를 통하여 검출하고, 이렇게 검출된 반사광을 일정한 신호로 변환시키는 방법으로 디스크면상에 기록된 정보를 재생하는 리니어트랙킹방식의 광픽업엑츄에이터가 설치된다.In general, various optical disc players such as a mini disc player (MDP), a compact disc player (CDP) or a laser disc player (LDP) are mounted on a turntable and move linearly in the radial direction of the disc from the vertical direction of the disc being rotated. The disc position is detected by detecting a track position, injecting a laser beam into a recording pit formed on the disc surface at the detected track position, detecting the reflected light through an optical system, and converting the detected reflected light into a constant signal. An optical pickup actuator of a linear tracking method for reproducing information recorded on the surface is provided.
이와 같은 리니어트랙킹방식의 광픽업엑츄에이터(10)는 제1도에 도시된 바와 같이, 중앙부에 레이저통광공이 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 상방에는 디스크의 기록면에 레이저광을 접속시키기 위한 대물렌즈(18)와, 상기 대물렌즈(18)를 잡아주는 대물렌즈홀더(20)가 동일축상에 설치되며, 상기 대물렌즈홀더(20)의 전후방향 외측에는 정확한 트랙검출을 위한 상기 대물렌즈(18)의 래디얼방향으로서의 움직임을 제어하는 트랙킹조정코일(22), 그 좌우방향외측에는 디스크의 각편차(Angel Deviation) 및 편심도 등에 의하여 디스크와 광픽업사이의 거리변화가 발생할 때 디스크의 반사면이 초점심도내에 들어오도록 하기 위한 대물렌즈의 광축방향 움직임을 제어하는 포커싱조정코일(24)이 설치되며, 상기 대물렌즈홀더(20)의 양측면에는 상기 대물렌즈(18)의 광축 및 래디얼방향으로의 요동을 지지해줌과 동시에 외부로부터의 충격작용시 그 진동을 감쇄시켜주는 와이어형태 또는 얇은 편형태의 서스펜션(26)이 설치된 구조로 이루어진다.As shown in FIG. 1, the linear tracking optical pickup actuator 10 includes a yoke 14 in the front and rear direction with the laser through hole interposed therebetween on a base plate 12 having a laser through hole formed in a central portion thereof. A permanent magnet 16 is provided inside the yoke 14, while an objective lens 18 for connecting a laser beam to a recording surface of the disk above the laser passing hole, and the objective lens 18. The objective lens holder 20 for holding () is installed on the same axis, and the tracking adjustment for controlling the movement in the radial direction of the objective lens 18 for accurate track detection outside the front and rear directions of the objective lens holder 20. The coil 22 and its left and right outer sides allow the reflective surface of the disk to fall within the depth of focus when a distance change between the disk and the optical pickup occurs due to the disc deviation and the eccentricity of the disk. Focusing adjustment coil 24 for controlling the movement of the objective lens in the optical axis direction is provided, and both sides of the objective lens holder 20 supports the optical axis and the movement in the radial direction of the objective lens 18 and at the same time It is composed of a structure in which a suspension or 26 in the form of a wire or a thin piece is provided, which attenuates the vibration during the impact action.
그러나, 이와 같은 종래의 광픽업엑츄에이터의 서스펜션(26)은 와이어의 구조적 특정상 포커싱 및 트래킹 조정시 정확히 두방향의 자유도를 갖는 것이 아니라 모든 방향으로의 자유도를 갖고 있으므로 운동방향이외의 방향에서의 외란이 작용할 때 회전병진운동이 발생하게 된다는 문제점이 있었다.However, since the suspension 26 of the conventional optical pick-up actuator does not have exactly two degrees of freedom when focusing and tracking adjustment due to the structural specificity of the wire, it has disturbances in directions other than the movement direction. There was a problem that the rotational translation occurs when this action.
또한, 이와 같은 종래 광픽업엑츄에이터의 서스펜션구조에서는 대물렌즈홀더 외측에 설치되는 포커싱조정코일, 트랙킹조정코일과 메인인쇄회로기판과의 전기적 연결을 위해 별도의 보조인쇄회로기판의 서스펜션의 일측 지지점부근에 설치되어야 하기 때문에 내부 구조가 한층 복잡해진다는 문제점이 있었으며, 제작과정 역시 복잡해진다는 문제점이 있었다.In addition, in the suspension structure of the conventional optical pickup actuator, a focusing adjustment coil, a tracking adjustment coil, and a tracking adjustment coil installed outside the objective lens holder are located near one support point of the suspension of a separate auxiliary printed circuit board for electrical connection with the main printed circuit board. There was a problem that the internal structure becomes more complicated because it has to be installed, and the manufacturing process also has a problem that becomes complicated.
이와 같은 종래 서스펜션의 문제점을 개선하기 위한 것으로서, 최근에는 제2도에 도시된 바와 같이, 상면에 포커싱조정회로패턴(30)과 트랙킹조정회로패턴(32)이 인쇄된 플렉시블인쇄회로기판(34)을 일정형태로 절곡하여 포커싱방향조정부재(36)를 형성하고, 상기 포커싱조정방향조정부재(36)의 선단외측면에 접착판(38)과 체결편(40)으로 이루어지는 P.B.T(Poly Butuylen Terephthalate)재질의 트랙킹방향조정부재(42)를 부착시킨 형태의 서스펜션을 제안하여 사용하고 있으나, 이와 같은 종래의 서스펜션구조에서는 트랙킹방향조정부재(42)를 형성할 때 상기 포커싱방향조정부재(36)의 선단면에 부착되는 접착판(38)과 대물렌즈홀더(44)에 결합되는 체결편(40)사이의 힌지부(46)는 수십 ㎛의 매우 얇은 두께를 가지고 있기 때문에 제작시 매우 어렵다는 것이 힌지의 가장큰 단점이고, 포커싱방향조정부재(36)와의 부착작업이 번거롭기 때문에 생산성이 불량해진다는 문제점이 있었다.In order to improve such a problem of the conventional suspension, as shown in FIG. 2, a flexible printed circuit board 34 in which a focusing adjustment circuit pattern 30 and a tracking adjustment circuit pattern 32 are printed on the upper surface thereof. To form a focusing direction adjustment member 36, and a PBT (Poly Butuylen Terephthalate) composed of an adhesive plate 38 and a fastening piece 40 on the outer surface of the tip of the focusing adjustment direction adjustment member 36. A suspension having a form in which a tracking direction adjusting member 42 of a material is attached is proposed and used. However, in the conventional suspension structure, the line of the focusing direction adjusting member 36 is formed when the tracking direction adjusting member 42 is formed. Since the hinge portion 46 between the adhesive plate 38 attached to the end face and the fastening piece 40 coupled to the objective lens holder 44 has a very thin thickness of several tens of micrometers, it is very difficult to manufacture it. large It is a disadvantage, and there is a problem that the productivity is poor because the attachment work with the focusing direction adjustment member 36 is cumbersome.
본 발명은 이와 같은 종래의 문제점을 해결하기 위한 것으로, 대물렌즈의 포커싱방향운동과 트랙킹방향운동이 운동방향이외의 방향으로부터의 외란이 작용되더라도 두방향의 자유도에 의하여 정확히 수행될 수 있도록 하고, 대물렌즈홀더에 설치되는 포커싱조정코일, 트랙킹조정코일과 메인인쇄회로기판과의 전기적연결이 별도의 보조인쇄회로기판 없이도 간단히 이루어질 수 있도록 하며, 종래 기술의 큰 단점인 힌지를 없애고 포커싱조정부재와 같은 재질로서 포커싱운동때처럼 트랙킹조정부재의 날개부의 구부러짐을 이용할 수 있도록 하는 한편, 결합구조를 단순화하여 조립성 및 생산성을 향상시킬 수 있도록 한 새로운 형태의 광디스크플레이어용 광픽업엑츄에이터의 서스펜션을 제공하고자 하는데 목적이 있다.The present invention is to solve such a conventional problem, so that the focusing direction movement and the tracking direction movement of the objective lens can be accurately performed by two degrees of freedom even if disturbance from a direction other than the movement direction is applied, Focusing adjustment coil, tracking adjustment coil installed in the lens holder and the electrical connection between the main printed circuit board can be made easily without a separate auxiliary printed circuit board, eliminating the hinge, a major disadvantage of the prior art, and the same material as the focusing adjustment member The purpose of this invention is to provide a suspension of the optical pickup actuator for a new type of optical disc player that enables the bending of the wing portion of the tracking adjustment member as in the case of focusing movement, and improves the assembly and productivity by simplifying the coupling structure. There is this.
이와 같은 목적을 달성하기 위하여 본 발명은 베이스플레이트의 상면으로부터 돌설되어 대물렌즈홀더의 몸체상에 형성되어 서스펜션설치공내로 올라온 1쌍의 지지핀에 끼워져 결합되는 육면체형의 지지부재와, 상기 지지부재의 하단면에 일측단이 고정결합되고, 그 하단면 고정점으로부터 앞쪽으로 일정거리 떨어진 지점에서 상향절곡된 후, 일정높이에서 수평방향 뒷쪽으로 재차절곡되어 그 타단이 상기 지지부재의 상단면에 고정된 상태에서 상하방향으로 작용되면서 대물렌즈의 광축방향움직임을 안내하는 포커싱방향조정부재와, 상기 포커싱방향조정부재의 앞쪽 바깥쪽면으로부터 안쪽면으로 감싸지게 접혀지고, 그 안쪽면 중앙부로부터 뒷쪽으로 일정거리에 해당되는 부분의 양측이 서로 접착되어 고정축이 형성되며, 양단의 날개부가 대물렌즈홀더상의 서스펜션설치공내의 내측면에 끼워져 결합된 상태에서 좌우방향으로 작용되면서 대물렌즈의 래디얼방향으로의 움직임을 안내하는 트랙킹방향 조정부재로 이루어진 특징을 갖는다.In order to achieve the above object, the present invention is a hexahedral support member which is formed on the body of the objective lens holder protruding from the upper surface of the base plate and fitted into a pair of support pins raised into the suspension installation hole, and the support member. One end is fixedly coupled to the lower end of the bent, and then bent upward at a point away from the lower end of the fixed point, and then bent back to the horizontal direction at a certain height so that the other end is fixed to the upper end of the support member. Focusing direction adjusting member for guiding the optical axis direction movement of the objective lens while operating in the up and down direction, and folded to be wrapped inward from the front outer surface of the focusing direction adjusting member, and a certain distance from the inner center to the rear Both sides of the portion corresponding to each other are bonded to each other to form a fixed shaft, both ends of the wing As the operation in the fitted state in the coupling the inner surface of suspension holder's installation holes on the left and right directions and is characterized by comprising a tracking direction adjusting member for guiding the movement in the radial direction of the objective lens.
이하, 첨부된 도면에 의하여 본 발명의 일실시예를 보다 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail.
제3도 및 제4도는 각각 본 발명에 따른 광픽업엑츄에이터의 서스펜션(50)이 대물렌즈홀더(52)로부터 분리된 상태를 나타내는 분리사시도와 그 결합상태사시도를 나타내는 바, 상기한 서스펜션(50)을 구성하는 지지부재(54)는 가볍고 단단한 플라스틱재를 사출하여 형성하되, 그 하단면 소정위치에는 베이스플레이트(56)의 상면으로부터 돌출된 지지핀(58)이 끼워지는 지지핀삽입공(60)을 형성한다.3 and 4 respectively show an exploded perspective view showing a state in which the suspension 50 of the optical pickup actuator according to the present invention is separated from the objective lens holder 52, and a combined state perspective view thereof. The support member 54 constituting the support member 54 is formed by injecting a light and hard plastic material, the support pin insertion hole 60 is inserted into the support pin 58 protruding from the upper surface of the base plate 56 at a predetermined position of the lower surface To form.
한편, 상기항 지지부재(54)의 상·하단면에 고정설치되어 대물렌즈(62)의 광축방향움직임을 지지안내하는 포커싱방향조정부재(64)는 플렉시블인쇄회로기판(66)으로 형성하되, 그 상면에는 일단이 메인인쇄회로기판과 전기적으로 연결도고, 다른쪽끝이 대물렌즈홀더(52)에 설치되는 포커싱조정코일(68) 및 트랙킹조정코일(70)의 각 입력단 및 출력단에 연결되는 포커싱조정회로패턴(72)과 트랙킹조정회로패턴(74)을 인쇄하여 된 구조를 갖는다.On the other hand, the focusing direction adjusting member 64 is fixed to the upper and lower end surfaces of the support member 54 to guide the optical axis direction movement of the objective lens 62 is formed of a flexible printed circuit board 66, One end of the upper surface is electrically connected to the main printed circuit board, and the other end of the focusing adjustment is connected to each input terminal and output terminal of the focusing adjustment coil 68 and the tracking adjustment coil 70 installed in the objective lens holder 52. The circuit pattern 72 and the tracking adjustment circuit pattern 74 are printed.
한편, 상기한 서스펜션(50)을 구성하는 트랙킹방향조정부재(76)는 플레시블인쇄회로기판과 동일한 유면성을 갖는 합성수지재로 형성하되, 상기 포커싱방향조정부재(64)의 선단면의 높이와 동일 높이를 갖는 유연 합성수지를 일정거리로 절단하여 그 중심부를 포커싱방향조정부재(64)의 선단면외측으로부터 감아 안쪽면으로 향하여 접고, 그 접혀진 면을 일정거리만큼 부착하여 고정축(78)을 형성하는 한편, 그 양단에 형성된 날개부(77)는 바깥쪽이 넓고, 내측으로 갈수록 좁아지는 쐐기형태로 형성하고, 이에 대응하는 대물렌즈홀더(52)의 서스펜션설치공(82)의 내측면 소정위치에는 상기 날개부(80)와 동일형상을 갖는 날개부삽입홈(84)을 형성한다.On the other hand, the tracking direction adjustment member 76 constituting the suspension 50 is formed of a synthetic resin material having the same oiliness as the flexible printed circuit board, the height of the front end surface of the focusing direction adjustment member 64 and A flexible synthetic resin having the same height is cut at a predetermined distance, the center of which is wound from the outside of the front end face of the focusing direction adjusting member 64, folded toward the inner side, and the folded surface is attached by a predetermined distance to form the fixed shaft 78. On the other hand, the wing portion 77 formed on both ends is formed in the shape of a wedge, the outer side is wider, narrower toward the inner side, the predetermined position of the inner surface of the suspension installation hole 82 of the objective lens holder 52 corresponding thereto. The wing portion insertion groove 84 having the same shape as the wing portion 80 is formed therein.
이와 같은 본 발명의 작용은 다음과 같다.Such action of the present invention is as follows.
제4도는 도시된 바와 같이, 본 발명에 따른 서스펜션(50)이 대물렌즈홀더(52)에 결합설치된 상태에서 디스크를 플레이어에 삽입하고, 작동시키면 광픽업엑츄에이터가 디스크의 수직하방에서 래디얼방향으로 직선 이용되면서 디스크상에 기록된 정보를 재생시키게 된다.4, when the disk 50 is inserted into the player while the suspension 50 according to the present invention is coupled to the objective lens holder 52, and the optical pickup actuator is straight in the radial direction from the vertical down of the disk. As used, the information recorded on the disc is reproduced.
이때, 디스크의 각 편차 및 편심도 등에 의해 디스크와 광픽업엑츄에이터사이의 거리가 일정하게 유지되지 않고, 계속해서 변하게 되며, 이렇게 발생되는 변화량은 광학계에서 포커스에러로 검출되어 포커스서보시스템을 작동시켜 대물렌즈(62)를 초점심도내에 들어오도록 한다. 이때, 대물렌즈(62)의 광축방향움직임은 제5도의 (b)에 도시된 바와 같이 상하방향으로 자유도를 갖는 포커싱방향조정부재(64)에 의해서 지지안내된다.At this time, the distance between the disc and the optical pickup actuator is not kept constant due to the deviation and eccentricity of the disc, and the change is continuously made. The amount of change generated is detected as a focus error in the optical system to operate the focus servo system. The lens 62 is brought into the depth of focus. At this time, the optical axis direction movement of the objective lens 62 is guided by the focusing direction adjusting member 64 having degrees of freedom in the vertical direction as shown in FIG. 5 (b).
한편, 대물렌즈(62)의 트랙킹방향조정은 제5도의 (a)에 도시된 바와 같이 상기 포커싱방향조정부재(64)의 선단면을 감싼 상태로 결합되어 좌우방향의 자유도를 갖는 트랙킹방향조정부재(76)에 의하여 이루어지는데, 광학계에서 검출한 트랙킹에러신호의 인가에 의하여 트랙킹서보시스템이 작동되면 자계중에 놓여있는 트랙킹조정코일(70)이 래디얼방향으로 요동하게 되며, 이에 따라 상기 트랙킹방향조정부재(76)와 결합된 대물렌즈홀더(52)가 그 트랙킹방향조정부재(76)를 구성하는 날개부(80) 전체가 고정축(78)을 축으로 하여 포커싱운동때와 같은 형태로 구부려지고 그 결과 대물렌즈(62)의 트랙킹조정이 이루어지는 것이다.On the other hand, the tracking direction adjustment of the objective lens 62 is coupled to cover the front end surface of the focusing direction adjustment member 64, as shown in (a) of FIG. (76), when the tracking servo system is operated by the application of the tracking error signal detected by the optical system, the tracking adjustment coil 70 lying in the magnetic field oscillates in the radial direction. The entire wing portion 80 of the objective lens holder 52 coupled with the 76 is bent in the same shape as the focusing movement with the fixed shaft 78 as its axis. As a result, tracking adjustment of the objective lens 62 is performed.
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, 플렉시블인쇄회로기판을 구성부품으로 사용하기 때문에 별도의 보조인쇄회로기판이 필요없게 되고 힌지를 사용하지 않기 때문에 트랙킹조정부재의 생산이 매우 쉬워지며, 구조가 단순해지고, 제작이 간단해진다는 효과가 있다.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 acting direction, accurate positioning is performed. The flexible printed circuit board can be used as a component, which eliminates the need for a separate auxiliary printed circuit board and eliminates the use of hinges, making it easy to produce tracking adjustment members. This has the effect of simplicity.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940003667A KR970000644B1 (en) | 1994-02-28 | 1994-02-28 | Suspension of optical pick up actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940003667A KR970000644B1 (en) | 1994-02-28 | 1994-02-28 | Suspension of optical pick up actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR950025658A KR950025658A (en) | 1995-09-18 |
| KR970000644B1 true KR970000644B1 (en) | 1997-01-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019940003667A KR970000644B1 (en) | 1994-02-28 | 1994-02-28 | Suspension of optical pick up actuator |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR970000644B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100711862B1 (en) * | 2000-07-08 | 2007-04-25 | 엘지전자 주식회사 | Slim type optical pick up having a flexible printed circuit board |
-
1994
- 1994-02-28 KR KR1019940003667A patent/KR970000644B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100711862B1 (en) * | 2000-07-08 | 2007-04-25 | 엘지전자 주식회사 | Slim type optical pick up having a flexible printed circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| KR950025658A (en) | 1995-09-18 |
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