KR0147164B1 - Optical pickup actuator for cdp - Google Patents
Optical pickup actuator for cdpInfo
- Publication number
- KR0147164B1 KR0147164B1 KR1019950017789A KR19950017789A KR0147164B1 KR 0147164 B1 KR0147164 B1 KR 0147164B1 KR 1019950017789 A KR1019950017789 A KR 1019950017789A KR 19950017789 A KR19950017789 A KR 19950017789A KR 0147164 B1 KR0147164 B1 KR 0147164B1
- Authority
- KR
- South Korea
- Prior art keywords
- objective lens
- adjustment coil
- lens holder
- optical pickup
- pickup actuator
- Prior art date
Links
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
- G11B7/12—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
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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
- G11B7/0901—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 for track following only
-
- 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
- G11B7/0908—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 for focusing only
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
본 발명은 컴팩트 디스크 플레이어용 광 픽업 액츄에이터에 관한 것으로 서보시스템에서 전기적 신호를 인가받아 안착된 디스크의 반사면에 촛점을 집속시키기 위하여 대물렌즈를 광축 및 래디얼방향으로의 움직이는 광 픽업액츄에이터에 있어서, 상기 대물렌즈가 외측에 설치되고, 사각형의 형상을 갖으며, 그 내부의 무게중심에 포커싱조정코일 및 트래킹조정코일이 설치되어 있는 대물렌즈홀더와, 상기 대물렌즈홀더의 일면에 끼움결합되어 무게중심을 보정하는 밸랜서와, 상기 대물렌즈홀더내의 포커싱조정코일 및 트래킹조정코일과 유동가능하게 소정간격을 가지고 마주보는 하나의 내측요오크와, 상기 대물렌즈홀더내의 포커싱조정코일 및 트래킹조정코일에 반발력을 발생하는 영구자석이 부착된 하나의 외측요오크를 구비함을 특징으로 하여 광 픽업 액츄에이터를 구성하는 부품의 수를 경감시켜 제조공정의 단순화 및 원가를 절감하는 것이다.The present invention relates to an optical pickup actuator for a compact disc player, comprising: an optical pickup actuator for moving an objective lens in an optical axis and a radial direction in order to focus an object on a reflective surface of a mounted disk by receiving an electrical signal from a servo system; The objective lens is installed on the outside, has a rectangular shape, and has an objective lens holder having a focusing adjustment coil and a tracking adjustment coil installed in the center of gravity of the inside thereof, and is fitted to one surface of the objective lens holder to provide a center of gravity. Repulsive force is applied to the balancer to be calibrated, one inner yoke that is movable at a predetermined interval with the focusing adjustment coil and the tracking adjustment coil in the objective lens holder, and the focusing adjustment coil and the tracking adjustment coil in the objective lens holder. Characterized in that it has one outer yoke attached to the permanent magnet To reduce the number of parts constituting the optical pickup actuator is to reduce the cost and simplify the manufacturing process.
Description
제1도는 종래의 광 픽업 액츄에이터의 사시도.1 is a perspective view of a conventional optical pickup actuator.
제2도는 본 발명에 따른 컴팩트 디스크 플레이어용 광 픽업 액츄에이터의 분해 사시도.2 is an exploded perspective view of an optical pickup actuator for a compact disc player according to the present invention.
제3도는 본 발명에 따른 컴팩트 디스크 플레이어용 광 픽업 액츄에이터의 사시도.3 is a perspective view of an optical pickup actuator for a compact disc player according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 레어져통과공 20 : 플레이트1: Leisure passage 20: Plate
21 : 내측요오크 22 : 외측요오크21: inner yoke 22: outer yoke
23 : 제2요오크 24 : 영구자석23: second yoke 24: permanent magnet
25 : 대물렌즈 26 : 대물렌즈홀더25: objective lens 26: objective lens holder
27 : 포커싱조정코일 28 : 트래킹조정코일27: focusing adjustment coil 28: tracking adjustment coil
29 : 와이어 30 : 홀더겔29 wire 30 holder gel
31 : PCB 32 : 신호전달편31: PCB 32: signal transmission
33 : 밸랜서33: Balancer
본 발명은 컴팩트 디스크 플레이어용 광 픽업 액츄에이터에 관한 것으로 특히, 광 픽업 액츄에이터를 구성하는 부품의 수를 경감시켜 제조공정의 단순화 및 원가를 절감하는 컴팩트 디스크 플레이어용 광 픽업 액츄에이터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup actuator for a compact disc player, and more particularly, to an optical pickup actuator for a compact disc player, which simplifies the manufacturing process and reduces costs by reducing the number of parts constituting the optical pickup actuator.
일반적으로 광 픽업 액츄에이터는 미니디스크플레이어(MDP), 콤팩트 디스크플레이어(CDP)나 레이져디스크플레이어(LDP)와 같은 각종 광학디스크플레이어의 광기록매체인 디스크의 수직하방에 설치되어 그 디스크의 래디얼 방향으로 직선 이동하면서 디스크상에서 원하는 트랙위치를 검출하고, 검출된 트랙위치에서는 디스크면상에 기록된 피트에 레이져 광을 입사시킨 다음 그 반사광을 광학계를 통하여 검출하고 이렇게 검출된 반사광을 신호로 변환시켜서 디스크면상의 기록내용을 재생하도록 하는 장치이다.In general, the optical pickup actuator is installed vertically below the disk, which is an optical recording medium of various optical disk players, such as a mini disk player (MDP), a compact disk player (CDP), or a laser disk player (LDP). While detecting the desired track position on the disk while moving in a straight line, at the detected track position, laser light is incident on the pit recorded on the disk surface, and then the reflected light is detected through the optical system, and the detected reflected light is converted into a signal to A device for reproducing the recorded content.
이러한 광 픽업 액츄에이터에서는 포커싱조정코일 및 트랙킹조정코일이 설치되어 포커싱 조정을 위하여 포커싱조정코일에 전류가 인가되면 액츄에이터의 대물렌즈가 액츄에이터를 기준으로 상하방향 즉, 광축방향으로 움직임을 하고, 트래킹조정코일에 전류가 인가되면 액츄에이터의 대물렌즈가 액츄에이터를 기준으로 하여 좌우방향 즉, 래디얼방향으로 움직임을 함으로써 트래킹조정을 수행하고 있다.In such an optical pickup actuator, when a focusing adjustment coil and a tracking adjustment coil are installed and a current is applied to the focusing adjustment coil to adjust the focusing, the objective lens of the actuator moves in the vertical direction, that is, in the optical axis direction, and the tracking adjustment coil. When the current is applied to the objective lens of the actuator, the tracking adjustment is performed by moving in the left and right directions, that is, the radial direction with respect to the actuator.
종래의 광 픽업 액츄에이터에서는 제1도에서 보는 바와 같이 액츄에이터의 소정위치에 레이져광선이 통과하는 레이져통과공(1)이 형성되어 있는 플레이트(2)와, 상기 플레이트(2)의 길이방향 양 측면에 고정되어 있는 두개의 외측 요오크(3)(4)와, 상기 외측 요오크(3)(4)의 내측에 각각 설치되어 있는 두개의 영구자석(5)(6)과, 상기 외측 요오크(3)(4)의 내측으로 소정간격 이격되어 상기 플레이트(2)에 고정 설치되어 있는 두개의 내측 요오크(7)(8), 상기 내측 요오크(7)(8)에 각각 유동가능하게 끼워져 설치되게 코일이 다수회 감겨져 있는 포커싱조정코일(9)(10)과, 상기 포커싱조정코일(9)(10)의 외측면에 설치되고 상기 영구자석(5)(6)과 소정간격 이격되어 있는 트래킹조정코일(11)(12)과, 상기 플레이트(2)의 소정위치에 위치한 레이져통과공(1) 상방에 설치되어 디스크의 반사면에 촛점을 집속시키기 위한 대물렌즈(13)와, 상기 대물렌즈(13)와 동일축상에 설치되고 상기 대물렌즈(13)를 지지하며, 양 측면에 상기 포커싱조정코일(9)(10) 및 트래킹조정코일(11)(12)이 부착되어 있는 대물렌즈홀더(14)와, 상기 대물렌즈홀더(14)의 광축방향 및 래디얼방향으로의 요동을 지지해줌과 동시에 외부로부터의 충격작용시 그 진동을 감쇄하는 서스펜션(15)으로 이루어진 구조이다.In the conventional optical pickup actuator, as shown in FIG. 1, the plate 2 having the laser passing hole 1 through which the laser beam passes is formed at a predetermined position of the actuator, and on both sides of the plate 2 in the longitudinal direction. Two outer yoke (3) (4) which is fixed, two permanent magnets (5) (6) which are respectively provided inside the outer yoke (3) (4), and the outer yoke ( 3) the two inner yoke (7) (8) and the inner yoke (7) (8), which are fixed to the plate (2) and spaced apart by a predetermined interval inwardly, respectively, Installed on the outer surface of the focusing adjustment coil (9) (10) and the focusing adjustment coil (9) (10) in which the coil is wound several times so as to be spaced apart from the permanent magnet (5) (6) by a predetermined distance. Tracking adjustment coils (11) and (12) are installed above the laser passing hole (1) located at a predetermined position of the plate (2). An objective lens 13 for focusing the focusing surface on the reflective surface of the lens, and the objective lens 13 is installed on the same axis as the objective lens 13, and supports the focusing adjustment coil 9 on both sides ( 10) and the objective lens holder 14 to which the tracking adjustment coils 11 and 12 are attached, and support the fluctuations in the optical axis direction and the radial direction of the objective lens holder 14, and at the same time, the impact action from the outside. The structure is composed of a suspension (15) for damping the vibration.
이와 같이 이루어진 종래의 광 픽업 액츄에이터에서는 레이져 다이오드로부터 발생된 레이져 빔이 디스크의 기록 피트에 입사되고, 디스크의 기록피트로부터 반사된 레이져빔이 광학계상의 광검출장치(Photo Detecter)로 인가되어 기록피트상에 기록된 데이타를 읽어내게 된다. 그리고, 광학계상의 광검출장치(Photo Detecter)에서 레이져빔의 기록피트에서의 포커싱 및 트랙킹상태를 검출한 결과 교정이 필요한 경우에 서보시스템은 트래킹 조정 코일 및 포커싱 조정코일이 전류를 인가하게 된다. 트래킹조정코일 및 포커싱조정코일에 전류가 인가되면 코일이 전자석화 되며 외측 요오크(3)(4)의 내측면에 각각 장착된 영구자석(5)(6)과의 반발력으로 인하여 대물렌즈홀더(14)가 포커싱 조정을 위하여 광축방향으로 움직임을 하고, 트랙킹 조정을 위하여 대물렌즈홀더(14)가 래디얼방향으로 움직이게 된다.In the conventional optical pickup actuator, the laser beam generated from the laser diode is incident on the recording pit of the disk, and the laser beam reflected from the recording pit of the disk is applied to a photo detector on an optical system to form a recording pit. The data recorded in is read. The tracking system and the focusing adjustment coil apply current when the calibration is necessary as a result of detecting the focusing and tracking states at the recording feet of the laser beam by the photo detector on the optical system. When a current is applied to the tracking adjustment coil and the focusing adjustment coil, the coil is electromagnetized and the objective lens holder is caused by the repulsive force with the permanent magnets 5 and 6 mounted on the inner surfaces of the outer yoke 3 and 4, respectively. 14 moves in the optical axis direction for focusing adjustment, and the objective lens holder 14 moves in the radial direction for tracking adjustment.
그러나, 종래의 광 픽업 액츄에이터는 대물렌즈홀더의 구조가 좌우로 대칭되어 있는 사각형의 구조를 지니고 있기 때문에 액츄에이터를 구동시키기 위하여는 4개의 요오크와 각각 2개의 트래킹조정코일 및 포커싱조정코일, 그리고 영구자석 2개가 필요하게 된다. 이에 따라 액츄에이터를 이루고 있는 구성부품의 수가 많게 되어 다수의 조립공정이 필요하여 액츄에이터의 대량생산시 생산성이 낮을 뿐만 아니라 액츄에이터의 제조원가가 상승되어 경제성이 저하되는 문제점이 있다.However, the conventional optical pickup actuator has a rectangular structure in which the structure of the objective lens holder is symmetrical to the left and right, so that four actuators, two tracking adjustment coils and a focusing adjustment coil, and a permanent coil are used to drive the actuator. Two magnets are needed. Accordingly, the number of components constituting the actuator increases, which requires a large number of assembling processes, resulting in low productivity during mass production of the actuator, as well as an increase in manufacturing cost of the actuator, thereby lowering economic efficiency.
본 발명은 이와 같은 문제점을 해소하기 위하여 발명된 것으로써 액츄에이터의 구동시에 요오크, 코일 및 영구자석의 갯수를 줄이면서도 그 구동력 중심점과 무게중심이 일치하도록 액츄에이터를 설계함으로써 광 픽업 액츄에이터를 이루는 부품의 수를 경감시켜 액츄에이터 구성이 간략화 함으로서 액츄에이터의 대량생산시 생산성을 증대시키고, 제조원가를 하강시켜 액츄에이터의 경제성을 증대시킨 컴팩트 디스크 플레이어용 광 픽업 액츄에이터를 제공하는 데 그 목적이 있다.The present invention has been invented to solve such a problem, while reducing the number of yokes, coils and permanent magnets when the actuator is driven, the actuator is designed so that the center of gravity of the driving force coincides with the center of gravity of the component forming the optical pickup actuator. It is an object of the present invention to provide an optical pickup actuator for a compact disc player in which the number of actuators is reduced to simplify the number of actuators, thereby increasing productivity in mass production of the actuators, and lowering the manufacturing cost to increase the economics of the actuators.
이와 같은 목적을 수행하기 위한 본 발명에서는 서보시스템에서 전기적 신호를 인가받아 안착된 디스크의 반사면에 촛점을 집속시키기 위하여 대물렌즈를 광축 및 래디얼방향으로의 움직이는 광 픽업액츄에이터에 있어서, 상기 대물렌즈가 외측에 설치되고, 사각형의 형상을 갖으며, 그 내부의 무게중심에 포커싱조정코일 및 트래킹조정코일이 설치되어 있는 대물렌즈 홀더와, 상기 대물렌즈홀더의 일면에 끼움결합 되어 무게중심을 보정하는 밸랜서와, 상기 대물렌즈홀더내의 포커싱조정코일 및 트래킹조정코일과 유동가능하게 소정간격을 가지고 마주보는 하나의 내측요오크와, 상기 대물렌즈홀더내의 포커싱조정코일 및 트래킹조정코일에 반발력을 발생하는 영구자석이 부착된 하나의 외측요오크를 구비함을 특징으로 하는 것이다.In the present invention for performing the above object in the optical pickup actuator to move the objective lens in the optical axis and radial direction in order to focus on the reflective surface of the disk seated by receiving an electrical signal from the servo system, the objective lens is An objective lens holder which is installed on the outside and has a rectangular shape and has a focusing adjustment coil and a tracking adjustment coil installed in the center of gravity of the inside, and is fitted to one surface of the objective lens holder to correct the center of gravity. Permanent generation of repulsion in the lancer, one inner yoke that is movable at a predetermined interval with the focusing adjustment coil and the tracking adjustment coil in the objective lens holder, and the focusing adjustment coil and the tracking adjustment coil in the objective lens holder. It is characterized in that it has a single outer yoke attached to the magnet.
이하 첨부된 도면에 의하여 본 발명의 바람직한 실시예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명에 따른 광 픽업 액츄에이터는 제2에서 보는 바와 같이 액츄에이터의 하부에 위치하여 레이져 통과공(1)이 형성되어 있는 플레이트(20)와, 상기 플레이트(20)의 소정위치에 고정 설치되어 있는 ㄷ자 형상의 내·외측요오크(21)(22)와, 상기 내·외측요오크(21)(22)와 소정간격이 이격되어 상기 플레이트(20)의 길이방향 외측에 고정설치된 제2요오크(23)와, 상기 외측 요오크(22)의 내면에 고정설치되어 있는 영구자석(24)과, 상기 플레이트(20)에 설치되어 있는 레이져통과공(1) 상방에 설치되어 디스크의 반사면에 촛점을 집속시키기 위한 대물렌즈(25)와, 상기 대물렌즈(25)를 외측으로 지지하게 형성된 사각형의 구조를 갖는 대물렌즈홀더(26)와, 상기 대물렌즈홀더(26)의 내면에 설치되어 상기 외측요오크(22)에 유동되어 끼워지며 상기 대물렌즈(25)의 광축방향으로의 움직임을 제어하는 포커싱조정코일(27)과, 상기 대물렌즈홀더(26)의 내면에 설치되고 상기 포커싱조정코일(27)에 부착 설치되어 상기 대물렌즈(25)의 래디얼방향으로의 움직임을 제어하는 트래킹조정코일(28)과, 상기 대물렌즈홀더(26)의 내면에 위치한 포커싱 조정코일(27)과 트래킹 조정코일(28)에 서보시스템에서의 입·출력신호를 전달하며 상기 대물렌즈홀더(26)의 요동을 지지해줌과 동시에 외부로부터의 충격작용시 그 진동을 감쇄하는 서스펜션의 역활을 수행하는 4개의 와이어(29)와, 상기 제2요오크(23)에 고정되어 상기 와이어(29)를 지지하는 홀더겔(30)과, 상기 홀더겔(30)의 외측에 부착되고 서보시스템에서의 입·출력신호를 전달받는 PCB(31)와, 상기 대물렌즈홀더(26)의 양측면에 설치되어 상기 와이어(29)와 상기 포커싱 조정코일(27) 및 트래킹 조정코일(28)을 전기적으로 연결시키는 신호전달편(32)과, 상기 대물렌즈홀더(26)의 소정위치에 설치되어 무게중심을 보정하는 발랜서(33)로 구성되어 있다.The optical pickup actuator according to the present invention, as shown in the second, the plate 20, which is located at the lower portion of the actuator, the laser through hole (1) is formed, and is fixed to the predetermined position of the plate 20 A second yoke fixed to the outer side in the longitudinal direction of the plate 20 by being spaced apart from the inner and outer yokes 21 and 22 and the inner and outer yokes 21 and 22 by a predetermined interval ( 23), a permanent magnet 24 fixed to the inner surface of the outer yoke 22, and above the laser passing hole 1 provided on the plate 20, focusing on the reflective surface of the disk. An objective lens 25 for focusing the light source, an objective lens holder 26 having a rectangular structure formed to support the objective lens 25 outward, and an inner surface of the objective lens holder 26, It flows into the yoke 22 and is fitted in the optical axis direction of the objective lens 25. Focusing adjustment coil 27 for controlling the movement of the furnace, and installed on the inner surface of the objective lens holder 26 and attached to the focusing adjustment coil 27 to control the movement of the objective lens 25 in the radial direction. The input / output signal of the servo system is transmitted to the tracking adjustment coil 28, the focusing adjustment coil 27 located on the inner surface of the objective lens holder 26, and the tracking adjustment coil 28, and the objective lens holder ( The wire 29 is fixed to the second yoke 23 and four wires 29 which support the swing of the 26 and act as a suspension to attenuate the vibration in the event of an impact from the outside. A holder gel 30 supporting the holder, a PCB 31 attached to an outer side of the holder gel 30 and receiving an input / output signal from a servo system, and both sides of the objective lens holder 26. The wire 29 and the focusing adjustment coil 27 and tracking It consists of a signal transmission parts 32 and, to Lancer 33 which is installed at a predetermined position of the objective lens holder 26 corrects the center of gravity electrically coupled to the static coil 28.
또한, 본 발명에 따른 액츄에이터의 대물렌즈홀더(26)는 사각형의 형상을 갖으며, 사각형의 외측으로 대물렌즈(25)가 설치되는 구조를 갖는다. 즉, 대물렌즈홀더(26)의 무게중심에 상기 외측요오크(22)에 유동가능하게 끼워질수 있도록 포커싱조정코일(27) 및 트래킹조정코일(28)이 설치되어, 광 픽업 액츄에이터의 구동시 구동력 중심점과 액츄에이터의 무게중심이 일치하며 이에 따라 대물렌즈홀더(26)의 내측에 장착된 하나의 포커싱 조정코일(27) 및 트래킹 조정코일(28)에 상기 영구자석(24)의 반발력만으로 대물렌즈홀더(26)가 충분하게 움직이게 되는 것이다. 그리고, 상기 대물렌즈홀더(26)의 소정위치에는 구동시 무게중심을 보정하는 밸렌서(33)가 끼움결합될 수 있도록 도면에 미도시된 홈이 형성되어 있다.In addition, the objective lens holder 26 of the actuator according to the present invention has a quadrangular shape and has a structure in which the objective lens 25 is installed outside the quadrangle. That is, a focusing adjustment coil 27 and a tracking adjustment coil 28 are provided at the center of gravity of the objective lens holder 26 so as to be able to be inserted into the outer yoke 22 so as to drive the optical pickup actuator. The center of gravity and the center of gravity of the actuator coincide with each other, so that only one repulsive force of the permanent magnet 24 is applied to the focusing adjustment coil 27 and the tracking adjustment coil 28 mounted inside the objective lens holder 26. (26) is enough to move. In addition, a groove, not shown in the drawing, is formed at a predetermined position of the objective lens holder 26 so that the balancer 33 for correcting the center of gravity when driving is fitted.
이와 같이 구성된 본 발명에 따른 광 픽업 액츄에이터의 작용·효과를 상세히 설명하면 다음과 같다.The operation and effects of the optical pickup actuator according to the present invention configured as described above will be described in detail as follows.
본 발명은 제3도에서 보는 바와 같이 광학계상의 광검출장치(Photo Detecter)에서 레이져빔의 기록피트에서의 포커싱 및 트랙킹상태를 검출하게 된다. 여기서, 포커싱 및 트랙킹 상태를 검출한 결과 교정이 필요한 경우에는 서보시스템에서는 PCB(31)에 전기적인 신호를 전달한다. PCB(31)에서 와이어(29)를 통하여 신호전달편(32)에 전달된 전기적인 신호에 의하여 대물렌즈홀더(26)내의 무게중심에 설치되어 있는 포커싱 조정코일(27) 및 트래킹 조정코일(28)이 전자석화 된다. 포커싱 조정코일(27) 및 트래킹 조정코일(28)에 와이어(29)를 통하여 전류가 인가되면 포커싱조정코일(27) 및 트래킹조정코일(28)과 외측요오크(22)의 내면에 장착된 영구자석(24)간에 반발력이 발생하여 대물렌즈홀더(26)가 구동하게 된다. 이때 대물렌즈홀더(26)의 무게중심에 상기 포커싱조정코일(27)과 트래킹조정코일(28)이 설치되어 대물렌즈홀더(26)의 구동시 구동력 중심점과 무게중심점이 일치하게 된다. 따라서, 하나의 포커싱 조정코일(27) 및 트래킹 조정코일(28)만으로 대물렌즈홀더(26)의 움직임을 충분히 제어하게 된다. 즉, 대물렌즈홀더(26)내의 포커싱조정코일(27)에 전류가 인가되면 광축방향으로 움직임을 하고, 대물렌즈홀더(26)내의 트래킹조정코일(28)에 전류가 인가되면 래디얼방향으로 움직이게 된다.As shown in FIG. 3, the present invention detects the focusing and tracking states at the recording feet of the laser beam in a photo detector on an optical system. In this case, when calibration is necessary as a result of detecting the focusing and tracking states, the servo system transmits an electrical signal to the PCB 31. The focusing adjustment coil 27 and the tracking adjustment coil 28 installed at the center of gravity in the objective lens holder 26 by an electrical signal transmitted from the PCB 31 to the signal transmission piece 32 through the wire 29. ) Is electromagnetized. When current is applied to the focusing adjustment coil 27 and the tracking adjustment coil 28 through the wire 29, the permanently mounted on the inner surfaces of the focusing adjustment coil 27 and the tracking adjustment coil 28 and the outer yoke 22. A repulsive force is generated between the magnets 24 so that the objective lens holder 26 is driven. At this time, the focusing adjustment coil 27 and the tracking adjustment coil 28 are installed at the center of gravity of the objective lens holder 26 so that the driving force center point and the center of gravity of the objective lens holder 26 are coincident with each other. Thus, only one focusing adjustment coil 27 and tracking adjustment coil 28 can sufficiently control the movement of the objective lens holder 26. That is, when a current is applied to the focusing adjustment coil 27 in the objective lens holder 26, it moves in the optical axis direction, and when a current is applied to the tracking adjustment coil 28 in the objective lens holder 26, it moves in the radial direction. .
이상에서 상술한 바와 같이 본 발명에서는 액츄에이터의 구동시에 그 구동력 중심점과 무게중심이 일치하도록 대물렌즈홀더 및 주변장치를 설계함으로써 광 픽업 액츄에이터를 이루는 부품의 수를 경감시켜 액츄에이터 구성이 간략화 함으로서 액츄에이터의 대량생산시 생산성을 증대시키고, 제조원가를 하강시켜 액츄에이터의 경제성을 증대시키는 효과가 있다.As described above, in the present invention, the objective lens holder and the peripheral device are designed so that the driving force center point and the center of gravity of the actuator coincide with each other, thereby reducing the number of parts constituting the optical pickup actuator, thereby simplifying the configuration of the actuator. In production, productivity is increased, and manufacturing costs are lowered, thereby increasing the economic efficiency of the actuator.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950017789A KR0147164B1 (en) | 1995-06-28 | 1995-06-28 | Optical pickup actuator for cdp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950017789A KR0147164B1 (en) | 1995-06-28 | 1995-06-28 | Optical pickup actuator for cdp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR970002946A KR970002946A (en) | 1997-01-28 |
| KR0147164B1 true KR0147164B1 (en) | 1998-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950017789A KR0147164B1 (en) | 1995-06-28 | 1995-06-28 | Optical pickup actuator for cdp |
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| Country | Link |
|---|---|
| KR (1) | KR0147164B1 (en) |
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1995
- 1995-06-28 KR KR1019950017789A patent/KR0147164B1/en not_active IP Right Cessation
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| KR970002946A (en) | 1997-01-28 |
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