KR20030093373A - Shaft sliding type light pick-up actuator - Google Patents
Shaft sliding type light pick-up actuator Download PDFInfo
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- KR20030093373A KR20030093373A KR1020020029753A KR20020029753A KR20030093373A KR 20030093373 A KR20030093373 A KR 20030093373A KR 1020020029753 A KR1020020029753 A KR 1020020029753A KR 20020029753 A KR20020029753 A KR 20020029753A KR 20030093373 A KR20030093373 A KR 20030093373A
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- objective lens
- driving part
- optical pickup
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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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
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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
- G11B7/0932—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
- G11B7/08—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
- G11B7/08—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
- G11B7/12—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
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
본 발명은 축습동 광 픽업 액츄에이터에 관한 것으로, 가이드 레일을 따라 이동하는 안내부와 대물렌즈가 설치되는 구동부를 분리하여 탄성힌지로 연결함으로써, 가이드 레일과 안내부의 가이드공 사이에 발생하는 마찰에 의해 발생하는 스틱슬립구간을 제거하기 위한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a axial sliding optical pickup actuator, wherein a guide portion moving along a guide rail and a driving portion on which an objective lens is installed are separated and connected to each other by an elastic hinge. This is to remove the stick slip section that occurs.
대물렌즈를 장착한 이동광학계와, 레이저 다이오드 및 포토 디텍터를 구비한 고정광학계로 분리하여, 이동광학계의 중량을 최소화함으로써 고속의 액세스 시간을 필요로 하는 컴퓨터용 광학헤드 등에 사용하기 위한 광 픽업 액츄에이터가 특허출원번호 10-1999-0045845호(발명의 명칭: 광픽업 이송장치)에 소개되어 있다.The optical pickup actuator for use in a computer optical head requiring a high speed access time by separating the moving optical system equipped with the objective lens and the fixed optical system having the laser diode and the photo detector and minimizing the weight of the moving optical system is provided. Patent application No. 10-1999-0045845 (name of the invention: optical pickup transfer device).
상기 특허 출원의 도 1 및 도 2를 참고하면, 턴테이블에 안착된 디스크(미도시)에 광을 조사하고 그로부터 반사되는 광을 수광하면서 정보를 기록하거나 재생하는 광픽업이 구비되어 있다. 이 도면에 도시된 광픽업은 이동광학계(120)와 고정광학계(130)로 분리된 분리형 광픽업으로서, 대물렌즈(121)를 탑재한 이동광학계(120)는 가이드 레일(110)을 따라 디스크의 반경 방향으로 움직이고, 대물렌즈(121)를 통해 디스크에 광을 조사하기 위한 레이저 다이오드(131,132)나, 포토 디텍터(133) 등은 베이스(100)에 고정된 고정광학계(130)에 설치되는 구성으로 이루어져 있다. 따라서 이러한 분리형 광픽업에 있어서 광픽업의 이송은, 이동광학계(120)의 이송을 의미하게 된다.1 and 2 of the patent application, there is provided an optical pickup for recording or reproducing information while irradiating light onto a disk (not shown) mounted on a turntable and receiving light reflected therefrom. The optical pickup shown in this figure is a separate optical pickup separated into a moving optical system 120 and a fixed optical system 130, and the moving optical system 120 equipped with the objective lens 121 has a disc along the guide rail 110. The laser diodes 131 and 132 and the photo detector 133, which move in the radial direction, and irradiate light onto the disc through the objective lens 121, are installed in the fixed optical system 130 fixed to the base 100. consist of. Therefore, the transfer of the optical pickup in the split optical pickup means the transfer of the moving optical system 120.
광픽업의 이동광학계(120)를 이송하기 위한 구성으로는, 도시된 바와 같이 소위 리니어 모터(linear motor) 구동원리를 이용한 구조가 채용되고 있다. 즉, 가이드 레일(110)과 나란한 방향으로 한 쌍의 제 1요오크(141)와 제 2요오크(142)를 설치하고, 마그네트(143)로 상기 제 1,2요오크(141,142)를 경유하는 자로를 생성하게 하고, 이동광학계(120)의 양측에는 제 1요오크(141)에 지지되는 코일부(122a,122b)를 설치한다. 그리고 소정 전류공급유닛에서 코일부(122a,122b)에 전류를 공급하면, 그 공급되는 전류의 통전방향에 따라 이동광학계(120)가 전진 또는 후진하면서 디스크의 반경방향으로 이송된다.As a configuration for transferring the moving optical system 120 of the optical pickup, a structure using a so-called linear motor driving principle is employed as shown. That is, the pair of first yoke 141 and the second yoke 142 are installed in a direction parallel to the guide rail 110, and the magnets 143 pass through the first and second yokes 141 and 142. The coils 122a and 122b supported by the first yoke 141 are provided at both sides of the moving optical system 120. When the current is supplied to the coil units 122a and 122b by the predetermined current supply unit, the moving optical system 120 is moved forward or backward in the radial direction of the disk according to the energization direction of the supplied current.
그런데, 이러한 방식의 광 픽업 액츄에이터는 가이드 레일(110)과 이동광학계(120)의 안내홀 사이의 마찰에 의해 스틱슬립(stick-slip)구간이 존재하게 되며, 이로 인해 데드존(dead-zone)이 발생하게 된다.However, in the optical pickup actuator of this type, a stick-slip section exists due to friction between the guide rail 110 and the guide hole of the moving optical system 120, thereby causing a dead-zone. This will occur.
트랙을 추종하기 위해서는 트랙간격(CD의 경우 1.6㎛, DVD의 경우 0.74㎛)의 0.1정도 이하의 정밀도를 가지고 위치제어가 이루어져야 하는데, 이 부분이 데드존에 걸리게 되어 트랙을 추종하는데 어려움이 있다.In order to follow the track, the position control should be performed with a precision of about 0.1 or less of the track interval (1.6 μm for CD and 0.74 μm for DVD), and this part becomes dead zone, which makes it difficult to follow the track.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출한 것으로, 본 발명의 목적은, 가이드 레일을 따라 이동하는 안내부와 대물렌즈가 설치되는 구동부를 분리하여 탄성힌지로 연결함으로써, 가이드 레일과 안내부의 가이드공 사이에 발생하는 마찰에 의해 발생하는 스틱슬립구간을 제거하기 위한 것이다.The present invention has been made to solve the above problems, an object of the present invention, by separating the guide portion moving along the guide rail and the drive unit is installed to the objective lens by connecting the elastic guide, the guide rail and the guide portion It is for removing the stick slip section caused by the friction generated between the guide holes.
도 1은 본 발명의 일실시예에 따른 축습동 광 픽업 액츄에이터가 탑재된 디스크 플레이어의 사시도.1 is a perspective view of a disk player mounted with a sliding optical pickup actuator according to an embodiment of the present invention.
도 2는 도 1에 도시한 액츄에이터의 정단면도.FIG. 2 is a front sectional view of the actuator shown in FIG. 1. FIG.
도 3은 도 2에 도시한 액츄에이터의 측단면도.3 is a side cross-sectional view of the actuator shown in FIG.
〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
10: 액츄에이터20: 구동부10: actuator 20: drive unit
30: 대물렌즈32: 전반사 미러30: objective lens 32: total reflection mirror
40: 코일부50: 안내부40: coil portion 50: guide portion
52, 54: 가이드공60: 가이드 레일52, 54: guide ball 60: guide rail
70: 탄성힌지80: 마그네트70: elastic hinge 80: magnet
상기와 같은 목적을 달성하기 위한 본 발명은, 대물렌즈를 장착한 이동광학계와, 레이저 다이오드 및 포토 디텍터를 구비한 고정광학계로 분리된 축습동 광 픽업 액츄에이터에 있어서, 상기 대물렌즈가 탑재되고, 양측면에 코일부가 구비된 구동부; 및 상기 구동부와 탄성힌지에 의해 연결되고, 가이드 레일이 결합되는 가이드공이 형성된 안내부;를 포함하는 축습동 광 픽업 액츄에이터를 제공한다.The present invention for achieving the above object, in the axial sliding optical pickup actuator separated into a moving optical system equipped with an objective lens and a fixed optical system having a laser diode and a photo detector, the objective lens is mounted, both sides A driving unit provided with a coil unit; And a guide part connected to the driving part by an elastic hinge and having a guide hole to which a guide rail is coupled.
이하에서는 본 발명의 양호한 실시예를 설명한다.Hereinafter, a preferred embodiment of the present invention will be described.
본 실시예는 대물렌즈를 장착한 이동광학계와, 레이저 다이오드 및 포토 디텍터를 구비한 고정광학계로 분리된 디스크 플레이어의 축습동 광 픽업 액츄에이터에 적용된다.This embodiment is applied to a sliding optical pickup actuator of a disc player which is divided into a moving optical system equipped with an objective lens and a fixed optical system having a laser diode and a photo detector.
도 1은 본 실시예에 따른 이동광학계인 축습동 광 픽업 액츄에이터가 탑재된 디스크 플레이어의 사시도이고, 도 2는 도 1에 도시한 액츄에이터의 정단면도이며, 도 3은 도 2에 도시한 액츄에이터의 측단면도이다.1 is a perspective view of a disc player mounted with a axial sliding optical pickup actuator which is a moving optical system according to the present embodiment, FIG. 2 is a front sectional view of the actuator shown in FIG. 1, and FIG. 3 is a side of the actuator shown in FIG. 2. It is a cross section.
디스크 플레이어에는 턴테이블(2)을 향하여 한 쌍의 가이드 레일(60)이 설치되고, 이 가이드 레일(60)의 외측에 한 쌍의 마그네트(80)가 가이드 레일(60)과 나란히 설치되어 있다.The disc player is provided with a pair of guide rails 60 facing the turntable 2, and a pair of magnets 80 are provided side by side with the guide rails 60 on the outside of the guide rail 60.
이러한 디스크 플레이어에 설치되는 이동광학계인 광 픽업 액츄에이터(10)는, 대물렌즈(30)가 탑재되고 양측면에 코일부(40)가 구비된 구동부(20)와, 구동부(20)의 하방에 탄성힌지(70)에 의해 연결되고 가이드 레일(60)이 결합되는 가이드공(52,54)이 형성된 안내부(50)로 이루어진다.The optical pickup actuator 10, which is a moving optical system installed in such a disc player, includes a driving unit 20 in which an objective lens 30 is mounted and coil parts 40 provided on both sides thereof, and an elastic hinge below the driving unit 20. It consists of a guide portion 50 is formed by the guide hole 52, 54 is connected by the 70 and the guide rail 60 is coupled.
이러한 탄성힌지(70)는 구동부(20)가 수㎛ 이하의 범위에서 유동하도록 하고, 복원력을 갖도록 한다.The elastic hinge 70 allows the drive unit 20 to flow in a range of several μm or less and to have a restoring force.
그리고 가이드공(52)는 원형으로 형성하고, 가이드공(54)는 가이드 레일(60)에 대해 다소 유동할 수 있도록 장공으로 형성한다. 이는 한쌍의 가이드 레일(60)간의 폭의 변화에 따른 조립성을 확보하고 마찰력을 최소화하기 위한 것이다.The guide hole 52 is formed in a circular shape, and the guide hole 54 is formed in a long hole so as to flow somewhat with respect to the guide rail 60. This is to ensure the assemblage according to the change in the width between the pair of guide rails 60 and to minimize the friction force.
상기 안내부(50)에는 레이저 광을 대물렌즈(30) 측으로 반사시키는 전반사 미러(32)가 설치된다.The guide part 50 is provided with a total reflection mirror 32 for reflecting the laser light toward the objective lens 30.
그리고 코일부(40)는 액츄에이터(10)의 이동시 항상 마그네트(80)의 자로에 노출되도록 동일한 간격을 유지하도록 설치된다.In addition, the coil unit 40 is installed to maintain the same interval so that the actuator 10 is always exposed to the magnet of the magnet 80 when the actuator 10 moves.
한편, 고정광학계인 레이저 다이오드 및 포토 디텍터는 디스크 플레이어의 본체(1)에 설치된다.On the other hand, a laser diode and a photo detector, which are fixed optical systems, are provided in the main body 1 of the disc player.
이하에서는 상기와 같은 축습동 광 픽업 액츄에이터의 작용을 설명한다.Hereinafter, the operation of the above-mentioned sliding motion optical pickup actuator will be described.
코일부(40)에 전원이 공급되면 마그네트(8)에서 형성되는 자속의 영향으로 플레밍의 왼손법칙에 따른 전자력이 발생하여 구동부(20)가 이동할 수 있는 동력이 발생된다.When power is supplied to the coil unit 40, an electromagnetic force is generated according to the left hand law of Fleming under the influence of the magnetic flux generated by the magnet 8, thereby generating power to move the driving unit 20.
이에 따라 대물렌즈(30)를 탑재한 구동부(20)는 가이드 레일(60)을 따라 턴테이블(2)에 장착되는 디스크의 반경 방향으로 움직이고, 본체(1)에 설치된 레이저 다이오드에서 레이저 광을 출사하여 대물렌즈(30)를 통해 디스크에 광을 조사하여 기록된 신호를 포토디텍터를 통하여 읽어 들이게 된다.Accordingly, the driving unit 20 equipped with the objective lens 30 moves along the guide rail 60 in the radial direction of the disk mounted on the turntable 2, and emits laser light from the laser diode installed in the main body 1. The disk is irradiated with light through the objective lens 30 to read the recorded signal through the photodetector.
이러한 방식의 광 픽업 액츄에이터는 가이드 레일(60)과 안내부(50)의 가이드공(52,54) 사이에서 마찰이 발생하지만, 탄성힌지(70)가 미세한 변형을 발생시킬 수 있으므로, 구동부(20)는 코일부(40)에 발생되는 전자력에 의해 정상적인 구동을 할 수 있게 된다. 즉, 트랙을 추종하기 위해서 필요한 트랙간격(CD의 경우 1.6㎛, DVD의 경우 0.74㎛)의 0.1정도 이하의 정밀도를 가지고 위치제어가 이루어지게 된다.In this type of optical pick-up actuator, friction occurs between the guide rail 60 and the guide holes 52 and 54 of the guide part 50, but the elastic hinge 70 may generate fine deformation, and thus the driving part 20 ) Can be normally driven by the electromagnetic force generated in the coil unit (40). That is, the position control is performed with a precision of about 0.1 or less of the track interval (1.6 μm for CD and 0.74 μm for DVD) necessary for following the track.
이와 같이 본 실시예의 액츄에이이터(10)는 안내부(50)가 마찰에 의해 움직이지 못하더라도 대물렌즈(30)를 포함한 구동부(20)는 탄성힌지(70)의 변형에 의해미소구간 이동이 가능하여 스틱슬립에 의한 영향 없이 트랙 추종이 가능하게 된다.As described above, in the actuator 10 of the present embodiment, even if the guide part 50 does not move due to friction, the driving part 20 including the objective lens 30 has a small section movement due to the deformation of the elastic hinge 70. It is possible to follow the track without the influence of the stick slip.
이상에서 설명한 바와 같이 본 발명은, 대물렌즈(30)가 탑재되고 양측면에 코일부(40)가 구비된 구동부(20)와, 구동부(20)와 탄성힌지(70)에 의해 연결되고 가이드 레일(60)이 결합되는 가이드공(52,54)이 형성된 안내부(50)로 이루어진 축습동 광 픽업 액츄에이터로서, 안내부(50)가 마찰에 의해 움직이지 못하더라도 대물렌즈(30)를 포함한 구동부(20)는 탄성힌지(70)의 변형에 의해 미소구간 이동이 가능하여 스틱슬립에 의한 영향 없이 트랙 추종이 가능하게 되는 효과가 있다.As described above, in the present invention, the objective lens 30 is mounted and connected to each other by a driving unit 20 having a coil unit 40 on both sides, a driving unit 20 and an elastic hinge 70, and a guide rail ( 60. A axial sliding optical pickup actuator comprising a guide part 50 having guide holes 52 and 54 to which 60 is coupled, and a driving part including an objective lens 30 even if the guide part 50 is not moved by friction. 20 is a micro-section can be moved by the deformation of the elastic hinge 70 has the effect that the track can be followed without the influence of the stick slip.
이상에서는 본 발명을 제한된 실시예로써 설명하였으나, 본 발명은 상기한 실시예에 한정되지 아니하며, 특허청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형이 가능할 것이다.The present invention has been described above as a limited embodiment, but the present invention is not limited to the above-described embodiment, and those skilled in the art without departing from the gist of the present invention claimed in the claims. Anyone can make a variety of variations.
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| Application Number | Priority Date | Filing Date | Title |
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| KR10-2002-0029753A KR100463977B1 (en) | 2002-05-29 | 2002-05-29 | Shaft sliding type light pick-up actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7182463B2 (en) | 2003-12-23 | 2007-02-27 | 3M Innovative Properties Company | Pixel-shifting projection lens assembly to provide optical interlacing for increased addressability |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940008521Y1 (en) * | 1992-08-21 | 1994-12-22 | 김영덕 | Pair glass |
| JPH07235071A (en) * | 1993-12-27 | 1995-09-05 | Toshiba Corp | Optical head device |
| JP3356918B2 (en) * | 1995-08-01 | 2002-12-16 | オリンパス光学工業株式会社 | Optical pickup |
| KR970063080A (en) * | 1996-02-27 | 1997-09-12 | 김광호 | Actuator supporting structure of optical pickup |
| JPH1027439A (en) * | 1996-07-10 | 1998-01-27 | Nippon Seiko Kk | Carriage unit for optical head |
| KR100555491B1 (en) * | 1999-10-21 | 2006-03-03 | 삼성전자주식회사 | Optical pickup transferring apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7182463B2 (en) | 2003-12-23 | 2007-02-27 | 3M Innovative Properties Company | Pixel-shifting projection lens assembly to provide optical interlacing for increased addressability |
| US7300157B2 (en) | 2003-12-23 | 2007-11-27 | 3M Innovative Properties Company | Pixel-shifting projection lens assembly to provide optical interlacing for increased addressability |
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