KR20040108029A - Focusing control apparatus of optical recorder - Google Patents
Focusing control apparatus of optical recorder Download PDFInfo
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- KR20040108029A KR20040108029A KR1020030038767A KR20030038767A KR20040108029A KR 20040108029 A KR20040108029 A KR 20040108029A KR 1020030038767 A KR1020030038767 A KR 1020030038767A KR 20030038767 A KR20030038767 A KR 20030038767A KR 20040108029 A KR20040108029 A KR 20040108029A
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- optical head
- swing arm
- coil
- optical
- focusing
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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
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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
- G11B7/085—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
- G11B7/0857—Arrangements for mechanically moving the whole head
- G11B7/08576—Swinging-arm positioners
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- Optical Recording Or Reproduction (AREA)
Abstract
Description
본 발명은 광기록재생기의 포커싱 제어장치에 관한 것으로서, 디스크와 광헤드 사이의 간격을 미세 조정할 수 있도록 하는 광기록재생기의 포커싱 제어장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing control device of an optical recorder, and more particularly, to a focusing control device of an optical recorder that enables fine adjustment of a distance between a disc and an optical head.
일반적으로, 근접장이란 광디스크와 같은 기록매체에 근접되게 배치된 광학 요소와 기록매체 사이의 간격이 20 ~ 300 nm 정도로 근접된 상태에서 데이터의 기록 및 재생을 수행하는 기술을 말한다.In general, the near field refers to a technique for performing data recording and reproducing in a state where the distance between the optical element and the recording medium disposed in proximity to the recording medium such as an optical disc is about 20 to 300 nm.
도 1 및 도 2는 종래의 근접장 광기록재생기의 구조를 도시한 것으로서, 도 1은 평면도, 도 2는 슬라이더부의 확대단면도이다.1 and 2 show the structure of a conventional near field optical recorder, FIG. 1 is a plan view and FIG. 2 is an enlarged cross-sectional view of a slider portion.
도시된 바와 같이, 종래의 근접장 광기록재생기는 베이스에 대해 왕복 회전 가능하게 설치된 스윙암(21)과, 그 스윙암(21)에 회전 구동력을 제공하는 액츄에이터(23)와, 공기동압에 의해 광디스크(10)에 대해 부상된 채로 광디스크(10)의 트랙을 스캔할 수 있도록 상기 스윙암(21)의 단부에 설치된 슬라이더(25) 및 이 슬라이더(25)에 설치되어 광학식으로 정보를 재생할 수 있도록 상기 광디스크(10)에 광스폿을 형성하는 광헤드(30)를 포함하여 구성된다. 여기서, 광디스크는 상변화형 광디스크와, 광자기디스크를 포함하는 것으로, 광디스크로 광자기디스크를 채용한 경우에는 상기 광헤드(30)는 자계변조를 위한 코일(35)을 더 구비한다.As shown, the conventional near field optical recorder has a swing arm 21 reciprocally rotatable with respect to a base, an actuator 23 providing a rotational driving force to the swing arm 21, and an optical disk by pneumatic pressure. A slider 25 provided at an end of the swing arm 21 and a slider 25 installed at the end of the swing arm 21 so as to scan a track of the optical disk 10 while being injured with respect to 10; And an optical head 30 for forming an optical spot on the optical disc 10. Here, the optical disk includes a phase change type optical disk and an optical magnetic disk. When the optical magnetic disk is employed as the optical disk, the optical head 30 further includes a coil 35 for magnetic field modulation.
광헤드(30)는 송수광부(40)와, 반사거울(32)과, 대물렌즈(33) 및, 고체함침렌즈(SIL : Solid Immersion Lens) 또는 고체함침미러(SIM : Solid Immersion Mirror)로 된 소형렌즈(34)를 포함하여 구성된다.The optical head 30 is composed of a light transmitting / receiving part 40, a reflecting mirror 32, an objective lens 33, and a solid immersion lens (SIL) or a solid immersion mirror (SIM). It comprises a small lens 34.
도 2는 소형렌즈(34)로 굴절형 고체함침렌즈를 채용한 장치를 예로 들어 보인 것으로, 소형렌즈(34)는 송수광부(40)에서 조사된 광이 큰 입사각으로 광디스크 (10)에 집속되도록 한다. 이로써 광디스크(10)에 맺힌 광스폿 크기를 줄일 수 있다.2 illustrates an apparatus employing a refractive-type solid-impregnated lens as the small lens 34, and the small lens 34 is configured to focus light irradiated from the transmitting and receiving part 40 onto the optical disk 10 at a large incident angle. do. As a result, the size of the light spot formed on the optical disc 10 can be reduced.
상기 송수광부(40)는 반도체 레이저, 광검출기 및 광경로변환수단을 포함하여 구성된다. 이때, 상기 광경로변환수단은 반도체 레이저에서 출사된 광이 상기 반사거울(32)을 향하도록 하고, 광디스크(10)에서 반사되어 되돌아오는 광이 상기 광검출기를 향하도록 광의 진행 경로를 변환한다.The transmitter / receiver 40 includes a semiconductor laser, a photodetector, and an optical path converting means. In this case, the optical path converting means converts the light path emitted from the semiconductor laser toward the reflective mirror 32 and the path of the light so that the light reflected from the optical disc 10 is returned to the photodetector.
이러한 송수광부(40)는 대물렌즈(33)에 적합한 지경을 갖는 레이저광을 조사하며, 상기 반사거울(32)은 상기 송수광부(40)로부터 입사되는 광을 대물렌즈 (33) 쪽으로 반사시킨다. 상기 대물렌즈(33)는 입사광을 상기 소형렌즈(34)에 집광시키며, 상기 소형렌즈(34)는 광디스크(10)에 근접장을 형성한다.The transmitter / receiver 40 irradiates a laser beam having a diameter suitable for the objective lens 33, and the reflection mirror 32 reflects the light incident from the transmitter / receiver 40 toward the objective lens 33. The objective lens 33 focuses incident light onto the small lens 34, and the small lens 34 forms a near field on the optical disk 10.
도 3 및 도 4는 종래의 근접장 광기록재생기의 구조를 도시한 것으로서, 도 3은 슬라이더(25)가 디스크(10)의 외측 단부를 슬라이드 구동하는 상태를 개략적으로 도시한 단면도, 도 4는 슬라이더(25)의 구조를 개략적으로 도시한 평면도이다.3 and 4 show the structure of a conventional near field optical recorder, FIG. 3 is a cross-sectional view schematically showing a state in which the slider 25 slides the outer end of the disk 10, and FIG. 4 shows the slider. It is a top view which shows the structure of 25 schematically.
도시된 바와 같이, 근접장 재생 및 기록을 위한 광기록재생기에 있어서, 렌즈부(33,34)는 디스크의 회전방향을 기준으로 슬라이더(25)의 중앙부에 위치한다.As shown, in the optical recorder for near field reproduction and recording, the lens sections 33 and 34 are located at the center of the slider 25 with respect to the rotational direction of the disk.
또한, 이와 같은 부상형 슬라이더 구조를 채용하기 위해서는, 디스크(10)로부터 근접장 범위내에서 슬라이더(25)를 부상시켜야 하므로, 슬라이더(25)의 디스크측면에 공기압을 발생시키는 에이비에스(ABS : Air Bearing System) 패드(Pad)부가 형성된다.In addition, in order to employ such a floating slider structure, the slider 25 must be floated within the near field range from the disk 10, so that the air pressure is generated on the disk side of the slider 25 (ABS: Air Bearing). System) Pad part is formed.
그러나, 상기와 같이 종래 구조로 구성된 광기록 재생장치에 있어서는 슬라이더가 공기압, 즉 유체유동을 이용하여 부상하여야 하는 특성상 디스크(10)와 광헤드(30)가 항상 일정하게 유지되기 어려운 문제점이 있다.However, in the optical recording and reproducing apparatus having the conventional structure as described above, there is a problem in that the disk 10 and the optical head 30 are not always kept constant due to the characteristics that the slider must float using air pressure, that is, fluid flow.
상기와 같은 점을 감안하여 안출한 본 발명의 목적은 광기록재생기의 헤드부와 디스크의 간격이 일정하게 유지되도록 포커싱 방향으로 미세구동을 실시할 수 있는 광기록재생기의 포커싱 제어장치를 제공함에 있다.SUMMARY OF THE INVENTION An object of the present invention devised in view of the above is to provide a focusing control apparatus of an optical recorder capable of fine driving in a focusing direction so that a distance between a head portion and a disk of an optical recorder is kept constant. .
도 1 내지 도 4는 종래의 근접장 광기록재생기의 구조를 도시한 것으로서,1 to 4 show the structure of a conventional near field optical recorder,
도 1은 평면도1 is a plan view
도 2는 슬라이더부의 확대단면도2 is an enlarged cross-sectional view of a slider portion;
도 3은 슬라이더가 디스크의 외측 단부를 슬라이드 구동하는 상태를 개략적으로 도시한 단면도3 is a cross-sectional view schematically showing a state in which the slider slides the outer end of the disk;
도 4는 슬라이더의 구조를 개략적으로 도시한 평면도4 is a plan view schematically showing the structure of a slider
도 5는 본 발명의 일 실시예인 광기록재생기의 포커싱 제어장치를 도시한 평면도,5 is a plan view showing a focusing control device of an optical recorder according to an embodiment of the present invention;
도 6은 도 5에 도시된 포커싱 제어장치를 부분적으로 확대하여 도시한 사시도.FIG. 6 is a partially enlarged perspective view of the focusing control device shown in FIG. 5; FIG.
**도면의 주요부분에 대한 부호의 설명**** Description of the symbols for the main parts of the drawings **
21 : 스윙암 23 : 액츄에이터21: swing arm 23: actuator
30 : 광헤드 140 : 탄성부재30: optical head 140: elastic member
142 : 지지부 151 : 포커싱코일142: support 151: focusing coil
152 : 영구자석152: permanent magnet
상기와 같은 본 발명의 목적을 달성하기 위한 광기록재생기의 포커싱 제어장치는 드라이브 본체에 힌지결합되고 안착위치와 작동위치를 회동궤적으로 하여 회동하는 액츄에이터와, 상기 액츄에이터의 일측으로부터 연장되어 돌출된 스윙암과, 그 일측 끝단에 장착된 광헤드가 상하 방향으로 이동 가능하도록 중간부에서 분기된 지지부가 상기 스윙암에 탄력 지지된 탄성부재와, 상기 탄성부재의 타측 끝단에 장착된 포커싱코일과, 상기 포커싱코일에 인접하도록 상기 스윙암에 장착되어 포커싱코일이 상하방향으로 이동될 수 있도록 하는 영구자석이 구비되어 구성된다.The focusing control device of the optical recorder for achieving the object of the present invention as described above is an actuator hinged to the drive main body and rotated by rotating the seating position and the operating position, and a swing extending from one side of the actuator An elastic member elastically supported on the swing arm by an arm and a support branch branched from an intermediate portion such that an optical head mounted at one end thereof is movable in the vertical direction, a focusing coil mounted at the other end of the elastic member, and A permanent magnet is mounted to the swing arm so as to be adjacent to the focusing coil so that the focusing coil can be moved in the vertical direction.
또한, 상기 탄성부재는 광헤드가 장착되는 광헤드장착부와, 그 중간부에서 분기되고 연장되어 스윙암에 지지되는 지지부와, 포커싱 코일이 장착되는 타측부인코일장착부가 구비되어 구성되는 것이 효과적이다.In addition, the elastic member is effectively configured to include an optical head mounting portion to which the optical head is mounted, a supporting portion branched from and extending from the middle portion thereof to be supported by the swing arm, and the other side coil mounting portion on which the focusing coil is mounted.
또한, 상기 탄성부재는 상기 포커싱코일과 영구자석의 상호작용에 의해 광헤드가 상하방향으로 이동될 수 있도록 함과 동시에 중력에 의한 광헤드장착부의 처짐을 방지하도록 코일장착부에서 광헤드장착부까지 연장된 보강재가 포함되어 구성되는 것이 바람직하다.In addition, the elastic member is extended from the coil mounting portion to the optical head mounting portion to allow the optical head to move in the vertical direction by the interaction between the focusing coil and the permanent magnet and to prevent the optical head mounting portion from sagging due to gravity. It is preferable that the reinforcement is included.
이하 본 발명의 일 실시예인 광기록재생기의 포커싱 제어장치를 첨부된 도면을 참조하여 보다 상세히 설명하면 다음과 같고, 종래 구성과 동일한 구조를 이루를 부분에 대하여는 동일한 부호를 부여하여 설명하고, 그에 대한 상세한 설명 및 도시는 도1 내지 도4를 참조한다.Hereinafter, a focusing control device of an optical recorder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Detailed description and illustration refer to FIGS. 1 to 4.
도 5는 본 발명의 일 실시예인 광기록재생기의 포커싱 제어장치를 도시한 평면도이고, 도 6은 도 5에 도시된 포커싱 제어장치를 부분적으로 확대하여 도시한 사시도로써, 도시된 바와 같이 본 발명의 일 실시예인 광기록재생기의 포커싱 제어장치는 베이스에 대해 왕복 회전 가능하게 설치된 스윙암(121)과, 그 스윙암(121)에 회전 구동력을 제공하는 액츄에이터(23)와, 그 일측 끝단에 장착된 광헤드(30)가 상하 방향으로 이동 가능하도록 중간부에서 분기된 지지부(142)가 상기 스윙암(121)에 탄력 지지된 탄성부재(140)와, 상기 탄성부재(140)의 타측 끝단에 장착된 포커싱코일(151)과, 포커싱코일(151)에 인접하도록 스윙암(121)에 장착되어 포커싱코일(151)이 상하방향으로 이동될 수 있도록 하는 영구자석(152)이 장착되어 구성된다.FIG. 5 is a plan view illustrating a focusing control device of an optical recorder according to an embodiment of the present invention, and FIG. 6 is a partially enlarged perspective view of the focusing control device shown in FIG. 5. The focusing control device of an optical recorder according to an embodiment includes a swing arm 121 reciprocally rotatable with respect to a base, an actuator 23 providing a rotational driving force to the swing arm 121, and one end mounted at one end thereof. The support part 142 branched from the middle part so that the optical head 30 is movable in the vertical direction is mounted on the elastic member 140 elastically supported by the swing arm 121 and the other end of the elastic member 140. The focusing coil 151 and the permanent magnet 152 is mounted to the swing arm 121 to be adjacent to the focusing coil 151 so that the focusing coil 151 can be moved up and down.
상기 스윙암(121)은 돌출된 일측 끝단부에 소정의 간격을 두고 서로 평행하게 돌출된 고정부(121a)가 형성되고, 탄성부재(140)는 광헤드(30)가 장착되는 일측 끝단부인 광헤드장착부(141)와, 그 중간부에서 양측면으로 분기되고 연장되어 스윙암(121)의 고정부(121a)에 지지되는 지지부(142)와, 포커싱코일(151)이 장착되는 타측부인 코일장착부(143)로 이루어진다. 또한, 코일장착부(143)에 장착된 포커싱코일(151)과 스윙암(121)에 장착된 영구자석(152)의 상호작용에 의해 광헤드(30)가 상하방향으로 이동될 수 있도록 함과 동시에 중력에 의한 광헤드장착부(143)의 처짐을 방지하도록 코일장착부(143)에서 광헤드장착부(141)까지 연장된 보강재(144)가 보강된다.The swing arm 121 has a fixed portion 121a protruding in parallel with each other at a predetermined interval at one protruding one end portion, and the elastic member 140 is one end portion at which the optical head 30 is mounted. The head mounting part 141, the support part 142 which is branched and extended from both sides in the middle part, and is supported by the fixing part 121a of the swing arm 121, and the coil mounting part which is the other side to which the focusing coil 151 is mounted. It consists of 143. In addition, the optical head 30 can be moved upward and downward by the interaction between the focusing coil 151 mounted on the coil mounting unit 143 and the permanent magnet 152 mounted on the swing arm 121. The reinforcement 144 extending from the coil mounting part 143 to the optical head mounting part 141 is reinforced to prevent sagging of the optical head mounting part 143 due to gravity.
상기와 같이 구성된 광기록재생기의 포커싱 제어장치가 작동되는 과정은 다음과 같다.The operation of the focusing control device of the optical recorder configured as described above is as follows.
종래 구조와 마찬가지로 액츄에이터(23)의 작동에 의해 스윙암(21)이 회동되어 트레킹이 실시되고, 포커싱 제어동작은 탄성부재(140)의 코일장착부(143)에 장착된 포커싱코일(151)에 공급되는 전류의 양을 조절하여 스윙암(121)에 장착된 영구자석(152)과의 상호작용에 의해 발생되는 자기력을 조절하고, 그 자기력에 의해 포커싱코일(151)이 상하 방향으로 이동되면 탄성부재(140)의 지지부(142)를 기준으로 하여 포커싱코일(151)이 장착된 코일장착부(143)의 상하운동과 대칭되는 방향으로 광헤드장착부(141)가 상하방향으로 이동된다. 즉, 디스크와 광헤드(30)의 간격이 일정간격 이상이 되면 코일장착부(143)를 상승시켜 광헤드장착부(141)는 하강시키고, 디스크와 광헤드(30)의 간격이 일정간격 이하가 되면 코일장착부(143)를 하강시켜 광헤드장착부(141)를 상승시키는 작동을 실시함으로써, 광헤드(30)와 디스크간의 간격이 항상 일정한 간격으로 유지되는 것이다.As in the conventional structure, the swing arm 21 is rotated by the operation of the actuator 23 to perform trekking, and the focusing control operation is supplied to the focusing coil 151 mounted on the coil mounting part 143 of the elastic member 140. By adjusting the amount of current to adjust the magnetic force generated by the interaction with the permanent magnet 152 mounted on the swing arm 121, and the focusing coil 151 is moved by the magnetic force in the vertical direction when the elastic member The optical head mounting portion 141 is moved in the vertical direction in a direction symmetrical with the vertical movement of the coil mounting portion 143 on which the focusing coil 151 is mounted based on the support portion 142 of the 140. That is, when the distance between the disk and the optical head 30 is greater than or equal to a predetermined interval, the coil mounting portion 143 is raised to lower the optical head mounting portion 141, and the distance between the disk and the optical head 30 is equal to or less than the predetermined interval. By lowering the coil mounting portion 143 to raise the optical head mounting portion 141, the distance between the optical head 30 and the disk is always maintained at a constant interval.
이와 같이 본 발명의 일 실시예인 광기록재생기의 포커싱 제어장치는 스윙암(121)에 장착된 영구자석(152)과 탄성부재(140)의 코일장착부(143)에 장착된 포커싱코일(151)간의 상호작용에 의해 포커싱코일(151)이 장착된 코일장착부(143)가 상하방향으로 이동되고, 또한 지지부(142)를 기준으로 하여 광헤드장착부(141)와 코일장착부(143)가 서로 대칭되도록 상하방향으로 운동함으로써, 디스크와 광헤드 사이의 항상 일정간격으로 유지되는 것이다.As described above, the focusing control device of the optical recorder according to the present invention includes a permanent magnet 152 mounted on the swing arm 121 and a focusing coil 151 mounted on the coil mounting portion 143 of the elastic member 140. By the interaction, the coil mounting unit 143 on which the focusing coil 151 is mounted is moved up and down, and the optical head mounting unit 141 and the coil mounting unit 143 are symmetrical with each other based on the support unit 142. By moving in the direction, there is always a constant distance between the disk and the optical head.
이상에서 살펴본 바와 같이 본 발명에 의한 광기록재생기의 포커싱 제어장치는 스윙암에 장착된 영구자석과 탄성부재의 코일장착부에 장착된 포커싱코일간의 상호작용에 의해 포커싱코일이 장착된 코일장착부가 상하방향으로 이동되고, 또한 지지부를 기준으로 하여 광헤드장착부와 코일장착부가 서로 대칭되도록 상하방향으로 운동하여 디스크와 광헤드 사이의 항상 일정간격으로 유지됨으로써, 제품의 신뢰성이 향상되는 효과가 있다.As described above, the focusing control device of the optical recorder according to the present invention has the coil mounting part equipped with the focusing coil by the interaction between the permanent magnet mounted on the swing arm and the focusing coil mounted on the coil mounting part of the elastic member. The optical head mounting portion and the coil mounting portion are moved up and down so that the optical head mounting portion and the coil mounting portion are symmetrical with respect to each other, and are always maintained at a constant distance between the disk and the optical head, thereby improving the reliability of the product.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0038767A KR100511269B1 (en) | 2003-06-16 | 2003-06-16 | Focusing control apparatus of optical recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0038767A KR100511269B1 (en) | 2003-06-16 | 2003-06-16 | Focusing control apparatus of optical recorder |
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| Publication Number | Publication Date |
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| KR20040108029A true KR20040108029A (en) | 2004-12-23 |
| KR100511269B1 KR100511269B1 (en) | 2005-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR10-2003-0038767A KR100511269B1 (en) | 2003-06-16 | 2003-06-16 | Focusing control apparatus of optical recorder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100714101B1 (en) * | 2004-12-08 | 2007-05-02 | 한국전자통신연구원 | Small size optical/magnetic head actuator with a pivot hinge and a halbach array magnet |
| EP2034474A1 (en) * | 2007-09-06 | 2009-03-11 | THOMSON Licensing | Suspension arm actuator for a scanning device |
-
2003
- 2003-06-16 KR KR10-2003-0038767A patent/KR100511269B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100714101B1 (en) * | 2004-12-08 | 2007-05-02 | 한국전자통신연구원 | Small size optical/magnetic head actuator with a pivot hinge and a halbach array magnet |
| EP2034474A1 (en) * | 2007-09-06 | 2009-03-11 | THOMSON Licensing | Suspension arm actuator for a scanning device |
| DE102007042291A1 (en) | 2007-09-06 | 2009-03-12 | Deutsche Thomson Ohg | Swing arm actuator for a scanner |
| US8392937B2 (en) | 2007-09-06 | 2013-03-05 | Thomson Licensing | Suspension arm actuator for a scanning device including a magnet for field optimization |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100511269B1 (en) | 2005-08-31 |
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