WO1998053449A1 - An optical pickup actuator and its damping device - Google Patents

An optical pickup actuator and its damping device Download PDF

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Publication number
WO1998053449A1
WO1998053449A1 PCT/KR1998/000108 KR9800108W WO9853449A1 WO 1998053449 A1 WO1998053449 A1 WO 1998053449A1 KR 9800108 W KR9800108 W KR 9800108W WO 9853449 A1 WO9853449 A1 WO 9853449A1
Authority
WO
WIPO (PCT)
Prior art keywords
damping device
optical pickup
pickup actuator
lens holder
magnet
Prior art date
Application number
PCT/KR1998/000108
Other languages
French (fr)
Inventor
Kyung-Sik Shin
Jeen-Gie Kim
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to AU70841/98A priority Critical patent/AU7084198A/en
Publication of WO1998053449A1 publication Critical patent/WO1998053449A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • 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

Definitions

  • the present invention relates to a damping device of an optical pickup actuator which is mounted at a compact disk player, etc. and detects recorded signals of a disk, and particularly to a damping device of an optical pickup actuator which reduces noticeably a resonance and is easily mounted.
  • an optical pickup actuator is widely used in a variety of devices including CD players, laser disk players, CD-ROM drives, DVD-ROM drives, etc.
  • FIGs. 1 and 2 the structure of an optical pickup actuator assembly is roughly explained.
  • a pair of yokes 6 and 6' are fixed facing each other.
  • a printed circuit board (PCB) 11 is mounted.
  • protrusions ⁇ a and 6b and 6a' and 6b' are formed respectively.
  • a lens holder 2 which is an integral bobbin/carrier assembly
  • through holes 12a and 12b are formed. Between the through holes 12a and 12b, an objective lens 1 is inserted and fixed.
  • a focusing coil 3 binds along the lateral surface of the lens holder 2.
  • a tracking coil 4 binds both ends of the lens holder 2 perpendicularly to the focusing coil 3.
  • the protrusions 6b and 6b' are inserted in the through holes 12a and 12b respectively.
  • magnets 5 and 5' are fixed.
  • the actuator is elastically fixed to a terminal 8 by four wires 7 each of one end is fixed to a PCB 13 and maintains a predetermined magnetic air gap with magnets 5 and 5'.
  • the lens holder 2 minutely moved in the focusing or tracking direction. At this time, the object lens 1 transmits laser beam and the actuator reads the signals stored in the disk.
  • the wire 7 whose one end is fixed to the terminal 8 is used.
  • the actuator still exhibits a strong mechanical resonance which affects its setting time and vibrational characteristics. This resonance can cause errors in reading information from the disk, particularly in high speed CD-ROM and DVD-ROM drives .
  • a damping material for removing a resonance of the actuator is put into a magnetic air gap formed between a magnet of a magnetic circuit unit of the optical pickup actuator and a lens holder facing the magnet to attach each other.
  • a damping fluid for removing the resonance of the actuator is put into the magnetic air gap formed between the magnet of the magnetic circuit unit of the optical pickup actuator and the lens holder facing the magnet.
  • the damping fluid can includes ferrofluids having sub- micron sized particles in a carrier liquid.
  • the magnetic particles include Fe 3 0 4 .
  • the ferrofluid has a predetermined viscosity.
  • the optical pickup actuator includes: a main body which is molded integrally; first and second yokes which are fixed at the surface of the main body apart from each other and each have a pair of protrusions perpendicularly to the surface of the main body facing each other; a lens holder which is movably inserted into the inner protrusions facing each other and bound by a focusing coil and a tracking coil perpendicularly formed each other, and has an objective lens at its surface; a magnet which is attached to the surface of the outer protrusions facing each other to face the lens holder; a wire which fixes the lens holder elastically to a terminal and applies an electrical signal to the focusing coil and the tracking coil; and a damping device in which a damping fluid is put into a gap between the magnet and the lens holder to attach each other.
  • the damping fluid of the damping device is applied to gaps between the inner protrusions facing each other and the lens holder to be inserted into the inner protrusions .
  • FIG. 1 is a perspective view illustrating the structure of a conventional optical pickup actuator
  • FIG. 2 is a sectional view illustrating a damping device of the optical pickup actuator shown in FIG. 1:
  • FIG. 3 is a sectional view illustrating a damping device of an optical pickup actuator according to the present invention.
  • FIG. 4 is a view illustrating the characteristic of an actuator of a conventional damping device
  • FIGs. 5A and 5B are views illustrating the characteristic of an actuator according to a damping device of the present invention.
  • FIGs. 6A and 6B are views illustrating the characteristic of an actuator employing a damper bond to the damping device of the present invention.
  • a damping fluid i.e., a ferrofluid 20 is applied.
  • a bobbin which is not illustrated is divided into two and the ferrofluid 20 is contacted to a part of a lens holder and the focusing coil 3 through a gap between the divided bobbins.
  • the ferrofluid 20 is put between a protrusion 6b and the inner surface of a through hole 12a, and a protrusion 6b' and the inner surface of a through hole 12b.
  • the ferrofluid 20 is a ultra-stable colloidal suspensions in which magnetic particles are very stably scattered in the fluid. Even in the case that a large centrifugal force or magnetic force are applied to the ferrofluid 20, since the magnetic particles are not separated from the fluid, it is possible to accurately control the position.
  • As the magnetic particle Fe 3 0 4 can be used.
  • the ferrofluid has a predetermined viscosity. The fluid is retained in the magnetic field and its viscosity provides the desired mechanical resistance (damping) to the moving assembly. Referring to FIG. 3, the wire 7 is directly fixed to the terminal 8 without using the damper bond.
  • the lens holder on which a disk is mounted moves minutely to the focusing direction or the tracking direction and then stops, a flow is generated in every directions.
  • the actuator's setting time and the vibrational characteristic are improved.
  • Access time is also improved.
  • the characteristic test of the actuator according to the damping device of the optical pickup actuator as shown in FIGs. 5A and 5B, since the resonance reduces to an ideal value zero (0) , the resonance point is not formed.
  • the process is not complicated.
  • the heat generated from a lens holder when using the ferrofluid is transmitted to the yokes and then radiated to the outside, it can prevent the lens holder and the objective lens from being melted due to the rise of heat in the focusing coil and the tracking coil.
  • the vibrational characteristic is noticeably improved by removing the minor vibration of the wire which supports the lens holder and a centering effect is realized by the characteristic of the ferrofluid itself.
  • the conventional damper bond is applied to the damping device of the present invention, as shown in FIGs. 6A and 6B.
  • the resonance is greatly reduced and the damping effect which is noticeably improved can be obtained.
  • the ferrofluid is used as the damping fluid. Also, it is possible to use another fluid or a material capable of obtaining the same damping effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Disclosed is a damping device of an optical pickup actuator in which a damping fluid for removing a resonance of the actuator is put into a magnetic air gap formed between a magnet of a magnetic circuit unit of the optical pickup actuator and a lens holder facing the magnet to attach each other. The damping fluid includes ferrofluids having sub-micron sized particles in a carrier liquid.

Description

TITLE OF THE INVENTION
AN OPTICAL PICKUP ACTUATOR AND ITS DAMPING DEVICE
BACKGROUND OF THE INVENTION
Field of the Invention.
The present invention relates to a damping device of an optical pickup actuator which is mounted at a compact disk player, etc. and detects recorded signals of a disk, and particularly to a damping device of an optical pickup actuator which reduces noticeably a resonance and is easily mounted.
Description of the Related Art
Conventionally, an optical pickup actuator is widely used in a variety of devices including CD players, laser disk players, CD-ROM drives, DVD-ROM drives, etc. Referring to FIGs. 1 and 2, the structure of an optical pickup actuator assembly is roughly explained. At the surface of a main body 15 which is integrally molded, a pair of yokes 6 and 6' are fixed facing each other. At the other surface of the main body 15, a printed circuit board (PCB) 11 is mounted. At the yokes 6 and 6', protrusions βa and 6b and 6a' and 6b' are formed respectively.
Moreover, at both sides on the surface of a lens holder 2 which is an integral bobbin/carrier assembly, through holes 12a and 12b are formed. Between the through holes 12a and 12b, an objective lens 1 is inserted and fixed. Moreover, a focusing coil 3 binds along the lateral surface of the lens holder 2. A tracking coil 4 binds both ends of the lens holder 2 perpendicularly to the focusing coil 3.
In the actuator having the above-described structure, the protrusions 6b and 6b' are inserted in the through holes 12a and 12b respectively. At the protrusions 6a and 6a' facing the tracking coil 4, magnets 5 and 5' are fixed. Moreover, the actuator is elastically fixed to a terminal 8 by four wires 7 each of one end is fixed to a PCB 13 and maintains a predetermined magnetic air gap with magnets 5 and 5'.
When the disk is arrived, the lens holder 2 minutely moved in the focusing or tracking direction. At this time, the object lens 1 transmits laser beam and the actuator reads the signals stored in the disk.
In the optical pickup actuator, as a damping device for reducing the movement of the lens holder 2 in every directions, the wire 7 whose one end is fixed to the terminal 8 is used.
Conventionally, referring to FIG. 2, to obtain a damping effect on a mechanical resonance of the wire 7, a damper bond
10 made of silicon lubber of gel state is entered inside of the terminal 8 and the wire 7 is moved in every directions through the damper bond 10.
However, even in the case of using the damper bond 10, as shown in FIG. 4, it has a problem in that the mechanical resonance is generated in some frequencies.
The actuator still exhibits a strong mechanical resonance which affects its setting time and vibrational characteristics. This resonance can cause errors in reading information from the disk, particularly in high speed CD-ROM and DVD-ROM drives .
Moreover, in the case of increasing the amount of the damper bond 10 to reduce the resonance, the sensitivity is rather declined.
In the case of using the damper bond, it is difficult to put the damper bond into the terminal. In addition, since it requires a process of irradiating the ultraviolet and a separate damper bond putting hole is formed at the terminal, the process becomes complicated.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a damping device of an optical pickup actuator capable of reducing noticeably a resonance. It is another object of the present invention to provide a damping device of an optical pickup actuator capable of being easily mounted.
According to one aspect of the present invention, a damping material for removing a resonance of the actuator is put into a magnetic air gap formed between a magnet of a magnetic circuit unit of the optical pickup actuator and a lens holder facing the magnet to attach each other.
According to another aspect of the present invention, a damping fluid for removing the resonance of the actuator is put into the magnetic air gap formed between the magnet of the magnetic circuit unit of the optical pickup actuator and the lens holder facing the magnet.
The damping fluid can includes ferrofluids having sub- micron sized particles in a carrier liquid. Preferably, the magnetic particles include Fe304.
Moreover, the ferrofluid has a predetermined viscosity.
According to another aspect of the present invention, the optical pickup actuator includes: a main body which is molded integrally; first and second yokes which are fixed at the surface of the main body apart from each other and each have a pair of protrusions perpendicularly to the surface of the main body facing each other; a lens holder which is movably inserted into the inner protrusions facing each other and bound by a focusing coil and a tracking coil perpendicularly formed each other, and has an objective lens at its surface; a magnet which is attached to the surface of the outer protrusions facing each other to face the lens holder; a wire which fixes the lens holder elastically to a terminal and applies an electrical signal to the focusing coil and the tracking coil; and a damping device in which a damping fluid is put into a gap between the magnet and the lens holder to attach each other.
Preferably, the damping fluid of the damping device is applied to gaps between the inner protrusions facing each other and the lens holder to be inserted into the inner protrusions .
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the present invention, and many of the attendant advantages thereof, will become readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: FIG. 1 is a perspective view illustrating the structure of a conventional optical pickup actuator;
FIG. 2 is a sectional view illustrating a damping device of the optical pickup actuator shown in FIG. 1:
FIG. 3 is a sectional view illustrating a damping device of an optical pickup actuator according to the present invention;
FIG. 4 is a view illustrating the characteristic of an actuator of a conventional damping device;
FIGs. 5A and 5B are views illustrating the characteristic of an actuator according to a damping device of the present invention; and
FIGs. 6A and 6B are views illustrating the characteristic of an actuator employing a damper bond to the damping device of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The objects, characteristics and advantages of the above- described invention will be more clearly understood through the preferable embodiments referring to the attached drawings.
Referring to FIG. 3, in a magnetic air gap formed between magnets 5 and 5' and a focusing coil 3 of end side which are bound by a tracking coil 4, a damping fluid, i.e., a ferrofluid 20 is applied. A bobbin which is not illustrated is divided into two and the ferrofluid 20 is contacted to a part of a lens holder and the focusing coil 3 through a gap between the divided bobbins. Preferably, the ferrofluid 20 is put between a protrusion 6b and the inner surface of a through hole 12a, and a protrusion 6b' and the inner surface of a through hole 12b. The ferrofluid 20 is a ultra-stable colloidal suspensions in which magnetic particles are very stably scattered in the fluid. Even in the case that a large centrifugal force or magnetic force are applied to the ferrofluid 20, since the magnetic particles are not separated from the fluid, it is possible to accurately control the position. As the magnetic particle, Fe304 can be used. The ferrofluid has a predetermined viscosity. The fluid is retained in the magnetic field and its viscosity provides the desired mechanical resistance (damping) to the moving assembly. Referring to FIG. 3, the wire 7 is directly fixed to the terminal 8 without using the damper bond.
According to the damping device of the present invention having the aforesaid structure, the lens holder on which a disk is mounted moves minutely to the focusing direction or the tracking direction and then stops, a flow is generated in every directions. At this time, by the damping operation of the ferrofluid 20, the actuator's setting time and the vibrational characteristic are improved. Access time is also improved. According to the characteristic test of the actuator according to the damping device of the optical pickup actuator, as shown in FIGs. 5A and 5B, since the resonance reduces to an ideal value zero (0) , the resonance point is not formed. Moreover, since only the operation of filling the gap formed between the yokes and the magnet exposed outside with the ferrofluid without performing the process of putting the damper bond, the process is not complicated.
Since the heat generated from a lens holder when using the ferrofluid is transmitted to the yokes and then radiated to the outside, it can prevent the lens holder and the objective lens from being melted due to the rise of heat in the focusing coil and the tracking coil.
In addition, the vibrational characteristic is noticeably improved by removing the minor vibration of the wire which supports the lens holder and a centering effect is realized by the characteristic of the ferrofluid itself.
As another embodiment, the conventional damper bond is applied to the damping device of the present invention, as shown in FIGs. 6A and 6B. Here, in the case that the ferrofluid is used when the damper bond is put, the resonance is greatly reduced and the damping effect which is noticeably improved can be obtained.
In the preferred embodiment of the invention, as the damping fluid, the ferrofluid is used. Also, it is possible to use another fluid or a material capable of obtaining the same damping effect.
While there have been illustrated and described what are considered to be preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the true scope of the present invention. In addition, many modifications may be made to adapt a particular situation to the teaching of the present invention without departing from the central scope thereof. Therefore, it is intended that the present invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out the present invention, but that the present invention includes all embodiments falling within the scope of the appended claims.

Claims

WHAT IS CLAIMED IS
1. A damping device of an optical pickup actuator, wherein a damping material for removing a resonance of the actuator is put into a magnetic air gap formed between a magnet of a magnetic circuit unit of said optical pickup actuator and a lens holder facing said magnet to attach each other.
2. A damping device of an optical pickup actuator, wherein a damping fluid for removing a resonance of the actuator is put into a magnetic air gap formed between a magnet of a magnetic circuit unit of said optical pickup actuator and a lens holder facing said magnet.
3. The damping device of Claim 2, wherein said damping fluid comprises ferrofluids having sub-micron sized particles in a carrier liquid.
4. The damping device of Claim 3, wherein said magnetic particles comprise Fe304.
5. The damping device of Claim 3, wherein said ferrofluid has a predetermined viscosity.
6. An optical pickup actuator comprising: a main body which is molded integrally; first and second yokes which are fixed at the surface of said main body apart from each other and each have a pair of protrusions perpendicularly to the surface of said main body facing each other; a lens holder which is movably inserted into inner protrusions facing each other and bound by a focusing coil and a tracking coil perpendicularly formed each other, and has an objective lens at its surface; a magnet which is attached to the surface of outer protrusions facing each other to face said lens holder; a wire which fixes said lens holder elastically to a terminal and applies an electrical signal to said focusing coil and the tracking coil; and a damping device in which a damping fluid is put into a gap between said magnet and said lens holder to attach each other.
7. The optical pickup actuator of Claim 6, wherein said damping fluid includes ferrofluids.
8. The optical pickup actuator of Claim 7, wherein sub- micron sized particles are scattered in said ferrofluid.
9. The optical pickup actuator of Claim 7, wherein said magnetic particles comprise Fe304.
10. The damping device of Claim 7, wherein said ferrofluid has a predetermined viscosity.
11. The damping device of Claim 6, wherein the damping fluid of said damping device is further applied to gaps between said inner protrusions facing each other and said lens holder to be inserted into said inner protrusions.
12. The damping device of Claim 6, wherein said wire is fixed to said terminal through a damper bond.
PCT/KR1998/000108 1997-05-19 1998-04-29 An optical pickup actuator and its damping device WO1998053449A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU70841/98A AU7084198A (en) 1997-05-19 1998-04-29 An optical pickup actuator and its damping device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019970019231A KR100238033B1 (en) 1997-05-19 1997-05-19 Damper of optical pickup actuator
KR1997/19231 1997-05-19

Publications (1)

Publication Number Publication Date
WO1998053449A1 true WO1998053449A1 (en) 1998-11-26

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KR (1) KR100238033B1 (en)
AU (1) AU7084198A (en)
MY (1) MY128951A (en)
TW (1) TW421787B (en)
WO (1) WO1998053449A1 (en)

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Publication number Priority date Publication date Assignee Title
KR20020087185A (en) * 2001-05-14 2002-11-22 엘지전자 주식회사 Extruded lens type optical pickup actuator

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* Cited by examiner, † Cited by third party
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KR100486280B1 (en) * 2002-11-15 2005-04-29 삼성전자주식회사 Optical pickup actuator for reducing vibration, optical pickup apparauts and optical recording/reproducing apparatus adopting the same
KR100616662B1 (en) 2005-01-13 2006-08-28 삼성전기주식회사 Focal length adjustment apparatus having improved vibrational characteristic and impact resistance

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JPH08147734A (en) * 1994-11-18 1996-06-07 Sony Corp Biaxial actuator
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JPH08306058A (en) * 1995-04-28 1996-11-22 Mitsumi Electric Co Ltd Optical head actuator and optical pickup device provided with same

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JPH01116916A (en) * 1987-10-29 1989-05-09 Nec Corp Head cleaning system for cartridge magnetic tape device

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JPH08147734A (en) * 1994-11-18 1996-06-07 Sony Corp Biaxial actuator
EP0735526A1 (en) * 1995-03-31 1996-10-02 Daewoo Electronics Co., Ltd Optical pick-up apparatus
JPH08306058A (en) * 1995-04-28 1996-11-22 Mitsumi Electric Co Ltd Optical head actuator and optical pickup device provided with same

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Publication number Priority date Publication date Assignee Title
KR20020087185A (en) * 2001-05-14 2002-11-22 엘지전자 주식회사 Extruded lens type optical pickup actuator

Also Published As

Publication number Publication date
TW421787B (en) 2001-02-11
AU7084198A (en) 1998-12-11
KR19980083785A (en) 1998-12-05
MY128951A (en) 2007-03-30
KR100238033B1 (en) 2000-02-01

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