CN100428345C - 3D drive unit for object lens in new type oblique drive mode - Google Patents

3D drive unit for object lens in new type oblique drive mode Download PDF

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Publication number
CN100428345C
CN100428345C CNB2005100115735A CN200510011573A CN100428345C CN 100428345 C CN100428345 C CN 100428345C CN B2005100115735 A CNB2005100115735 A CN B2005100115735A CN 200510011573 A CN200510011573 A CN 200510011573A CN 100428345 C CN100428345 C CN 100428345C
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China
Prior art keywords
magnet
coil
tracking
focusing
focusing coil
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Expired - Fee Related
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CNB2005100115735A
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Chinese (zh)
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CN1697044A (en
Inventor
巩马理
何发红
黄磊
闫平
柳强
陈刚
李晨
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Tsinghua University
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Tsinghua University
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Abstract

The present invention relates to a novel 3D driving device for object lenses in an oblique driving mode, which belongs to the technical field of optical read heads in optical storage systems. In order to overcome the defect that the sensitivity is low or the 3D driving independence is poor because of the excessive coils of the existing 3D driving device for object lenses. The present invention discloses the novel 3D driving device for object lenses in an oblique driving mode, which comprises fixed parts, movable parts supported by hanging wires, and a magnetic-field generating system composed of external yoke iron and magnets. The core components of the present invention are four magnets and four coils, wherein two magnets are magnetized in a demarcation mode, and the coils are fixed on the movable parts; the coils are arrayed in a mode that two coils are perpendicular to the other two coils, and thus, the resultant couple of two force couples is used for driving the movable parts to obliquely move. The device reduces the weight of the movable parts of the driving device for object lenses and ensures the sensitivity of the driving device for object lenses; simultaneously, the independence of every directional motion is enhanced. The device also has the characteristics of a few parts, low cost, simple and compact structure and easy processing.

Description

The three-dimensional article mirror drive of pitch drives mode
Technical field
The invention belongs to optical read head technical field in the optical storage system, particularly have the design of the objective lens device of focusing, tracking and inclination three-dimensional motion servo function.
Background technology
In optical disc storage system, optical read head is the topworks that reads data of optical disk, and optical read head mainly is made up of light channel structure and objective lens device two large divisions.In recent years, much have focus on and the two-dimentional objective lens device of tracking function disclosed in the literature.But along with the increase of storage density, the precision that reads of CD has been had higher requirement, perhaps because the needs of compact disc rocordable, the three-dimensional article mirror drive must be indispensable.Some three-dimensional article mirror drives have appearred in recent years.The three-dimensional article mirror drive is made up of the movable member that magnet and inside and outside yoke, fixed part and suspension support usually.Some three-dimensional moment device is realized the driving of movable member focusing, tracking and inclination three-dimensional motion respectively with 6 or more coil, the shortcoming of this mode is, coil is too much, has caused the weight of the movable member of objective lens device to increase, thereby makes the sensitivity of objective lens device descend.The three-dimensional moment device that adopts 4 coils is also arranged, but its inclination mode causes the perturbed force that is difficult to overcome can for the motion of focusing or tracking direction, perhaps produce additional movable member motion, i.e. the independence of three-dimensional motion is not strong, thereby influences reading of data of optical disk.The common feature of these torquers is to adopt resultant moment to drive movable member to produce banking motion, and the generation of resultant moment is because the differing in size of two power in the same way.
Summary of the invention
For the coil that overcomes existing three-dimensional article mirror drive too much causes sensitivity to descend or the three-dimensional not strong shortcoming of independence that drives, the present invention proposes a kind of three-dimensional article mirror drive of novel pitch drives, comprise fixed part, by being fixed on the outer yoke on the fixed part and being fixed on the magnetic field generation system that four blocks of magnet on the outer yoke are formed, and by the movable member that is fixed in the suspension support on the fixed part, described movable member comprises objective lens support, be located at the object lens on the objective lens support, and four coils between described magnet, it is characterized in that: four blocks of magnet in the generation system of described magnetic field are respectively first and focus on inclination magnet, second focuses on inclination magnet, the first tracking magnet and the second tracking magnet, wherein the first focusing inclination magnet and the second focusing inclination magnet are demarcated magnetized, the pole orientation that is the first half of magnet and Lower Half is opposite, and the first tracking magnet and the second tracking magnet have single pole orientation respectively;
Described four coils are respectively first focusing coil, second focusing coil, the first tracking tilt coil and the second tracking tilt coil, described first focusing coil is vertical with the first tracking tilt coil spatial disposition direction, and second focusing coil is vertical with the second tracking tilt coil spatial disposition direction;
The described first tracking tilt coil, first focusing coil, first focus on inclination magnet and the first tracking magnet forms first driving force generation system, and described first focusing coil next-door neighbour first focuses on inclination magnet and places; The described second tracking tilt coil, second focusing coil, second focus on inclination magnet and the second tracking magnet forms second driving force generation system, and described second focusing coil next-door neighbour second focuses on inclination magnet and places; Described two driving force generation systems are center symmetric arrangement.
Device of the present invention has only used four coils, reduced the weight of objective lens device movable member, guarantee the sensitivity of objective lens device, improved the independence of all directions motions simultaneously, can better meet the requirement of growing optical disc storage.It is low that this device has cost simultaneously, characteristics such as simple and compact for structure and easy processing.
Description of drawings
Fig. 1 a is the one-piece construction synoptic diagram of embodiments of the invention.
Fig. 1 b is the vertical view of Fig. 1 a.
Fig. 1 c is structure and the position that has shown four blocks of magnet of core component and four coils among Fig. 1 a.
Fig. 2 a is a principle schematic of the present invention.
Fig. 2 b is the direction index map of Fig. 2 a.
Fig. 3 is that the present invention removes outer yoke structural drawing afterwards, is the supplementary notes to structure of the present invention.
Fig. 4 has shown the another kind of arrangement of core component of the present invention.
Embodiment
Further describe the present invention below in conjunction with drawings and Examples.
Fig. 1 a and Fig. 1 b have shown an embodiment of the three-dimensional article mirror drive of novel pitch drives mode of the present invention, it comprises: the fixed part of being made up of suspension support 1 and printed circuit board (PCB) (pcb board) 2, by the movable member that object lens 5, objective lens support 4, four coils and other two printed circuit board (pcb board) are formed, the magnetic field that outer yoke 13 and four blocks of magnet are formed produces systems.Pcb board 2 is fixed on the suspension support 1, is used for connecting suspension, and an end of suspension adopts the method for welding to be welded on the pcb board 2 usually.The suspension support has the structure that connects with optical disk system usually.Four blocks of magnet all are fixed on the outer yoke 13, and outer yoke 13 supports the magnet except plaing a part, and the magnetic field that can also make magnet produce is more concentrated, and outer yoke 13 is fixed on the fixed part, and movable member is supported by suspension and is positioned at the centre of four blocks of magnet.
Said structure is the common structure of existing three-dimensional article mirror drive, and the invention is characterized in: the four blocks of magnet on the movable member and the spatial array of four coils are put mode, the mode of magnetization of four blocks of magnet and the array mode of direction.Referring to Fig. 1 c, four blocks of magnet are respectively first and focus on inclination magnet 10, the second focusing inclination magnet 6, the first tracking magnet 3 and the second tracking magnet 9.Four coils are respectively first focusing coil 11, second focusing coil 15, the first tracking tilt coil 12 and the second tracking tilt coil 8, and coil can use glue to handle usually, can keep shape invariance after making coil wind and do not scatter.Disturb for fear of producing, the horizontal component up and down of focusing coil is not too near, and should there be a certain amount of space the centre.Can be divided into two groups on the structure, the first tracking tilt coil 12, first focusing coil 11, the first focusing inclination magnet 10 and the first tracking magnet 3 are one group, form first driving force and produce system, described first focusing coil, 11 next-door neighbours first focus on inclination magnet 10 and place; The second tracking tilt coil 8, second focusing coil 15, second focus on inclination magnet 6 and the second tracking magnet, 9 formation, second driving force generation system, and described second focusing coil, 15 next-door neighbours second focus on inclination magnet 6 and place.The minimum distance of coil and magnet generally is 0.2mm to 1mm, produces friction during too near motion easily, and dish is read in influence, too far makes the magnetic field of coil position diminish, and makes the driving force insufficient strength.The direction of magnetization of four blocks of magnet all is parallel to the axial direction of suspension, but the concrete sensing of direction of magnetization is different.First focuses on inclination magnet 10 and second focuses on the 6 employing boundary magnetization of inclination magnet, the pole orientation that is the first half of magnet and Lower Half is opposite, the first tracking magnet 3 and the second tracking magnet 9 then all do not adopt the boundary magnetization, and two blocks of magnet have single pole orientation respectively.First focusing coil 11 is vertical with the first tracking tilt coil, 12 spatial disposition directions, and second focusing coil 15 is vertical with the second tracking tilt coil, 8 spatial disposition directions.Described two driving force generation systems are center symmetric arrangement.
First focusing coil 11 and second focusing coil 15 turn to rectangle as far as possible, coil winding becomes rectangle to improve sensitivity, under the situation that satisfies the sensitivity requirement so that driving force is bigger, for easy to process, described first focusing coil 11 and second focusing coil 15 also can turn to circle.The first tracking tilt coil 12 and the second tracking tilt coil, 8 best coiled rectangles so that its part that produces power as much as possible near magnet.
In the above-mentioned example, the coiling central axes of first focusing coil 11 and second focusing coil 15 is in the axial direction of suspension.But may be for the convenience of making, both central axis directions may have certain included angle with the axial direction of suspension.Equally, the direction of magnetization of four blocks of magnet adopts the axial direction that is parallel to suspension usually, but in some cases also can be not parallel.As for the needs on the structure arrangement, when magnet and coil can not be arranged in strict accordance with the embodiment of Fig. 1 a to Fig. 1 b, can pass through to adjust direction of magnetization to obtain optimum efficiency.Perhaps in order to improve the magnetic field intensity that the magnetized magnet of boundary produces, can allow the magnetized magnet of boundary up and down the axial direction of two-part direction of magnetization and suspension certain included angle is arranged.
Fig. 2 a has showed principle of work of the present invention.Fig. 2 b is the direction index map of Fig. 2 a, and the movable member banking motion is one and rotatablely moves that its sense of rotation is the rotation center direction of principal axis with the suspension axial direction in essence in the plane of focus movement direction and tracking direction of motion composition.The first tracking tilt coil 12 produces power F1 in the magnetic field that the first tracking magnet 3 produces, the second tracking tilt coil 8 produces power F2 in the magnetic field that the second tracking magnet 9 produces, control that sense of current is so that F1 is identical with the F2 direction in the first tracking magnet 3 and the second tracking magnet, 9 magnetized directions (promptly controlling the direction in the magnetic field that their produce) and the first tracking tilt coil and the second tracking tilt coil, making a concerted effort of F1 and F2 is exactly the driving force that the movable member tracking moves.First focusing coil 11 produces power F3 in the magnetic field that the first focusing inclination magnet 6 produces, second focusing coil 15 produces power F4 in the magnetic field that the second focusing inclination magnet 10 produces, it all is the boundary magnetization that the first focusing inclination magnet 10 and second focuses on inclination magnet 6, thereby the up and down two-part direction of magnetization of each magnet is different, thereby the magnetic direction that produces is also different, and two-part direction of current is also just opposite about each coil, therefore the direction of the power that two parts produce about each coil is identical, thereby two coils can produce the F3 and the F4 that makes a concerted effort with joint efforts respectively, control two and focus on the concrete direction of magnetization of inclination magnet and the direction of current of two focusing coils, can be so that F3 to be identical with the F4 direction, making a concerted effort of F3 and F4 is exactly the driving force of movable member focus movement.Exactly because first magnetic direction that focuses on inclination magnet 10 and 6 generations of the second focusing inclination magnet is demarcated, therefore the magnetic direction at the place, top and the bottom of the vertical part of the close first focusing inclination magnet 10 of the first tracking tilt coil 12 is different, so the direction of the power that two parts produce about it is opposite, therefore produced couple M1; The magnetic direction at the place, top and the bottom of the vertical part of the close second focusing inclination magnet 6 of the second tracking tilt coil 8 is different, so the direction of the power that two parts produce about it is opposite, therefore produced couple M2, control two and focus on the direction of inclination magnet magnetization and the direction of current of two tracking tilt coils, make that M1 and M2 are reverse, their resultant couple is the driving force of movable member banking motion.When not needing movable member to do banking motion, control the size of current in two tracking tilt coils, make F1 and F2 make a concerted effort to equal the driving force of tracking motion needs, and M1 and M2 equal and opposite in direction, direction is opposite, thereby resultant couple is 0, does not have the driving couple of banking motion to produce; When the needs movable member is done banking motion, control the size of current in two tracking tilt coils, make F1 and F2 make a concerted effort to equal the driving force of tracking motion needs, and M1 and M2 differ in size, direction is opposite, thereby resultant couple is not 0, thereby produces the driving couple of banking motion.As seen, in this structure, the motion of focus movement and tracking is all driven with joint efforts, and banking motion is driven by the resultant couple of two couples, and method of the use resultant moment driving banking motion that this and other people adopt is different.Based on said structure and principle, thereby there are multiple array mode in the magnetic field magnetisation direction and intensity, direction of current and the intensity that meet three direction motions (tracking, focusing and inclination) requirement, can select as required, and are to realize easily.The magnetization of magnet is strong more, can make that the magnetic field of its generation is strong more, thereby improves the sensitivity of movable member, but can increase cost, can weigh consideration.
Fig. 3 is structure supplementary notes figure of the present invention.Suspension not only plays supporting role, also plays a part transmission current.Electric current passes on the suspension from the pcb board 2 on the fixed part, passes to coil on the movable member by suspension again.Therefore an end of four suspensions adopts the method for welding to be welded on the pcb board 2 usually, an other end of suspension 14 and first time suspension 18 is welded on first printed circuit board (PCB) on 17 on first, and an other end of suspension 7 and second time suspension 19 is welded on second printed circuit board (PCB) on 16 on second.First printed circuit board (PCB) 17 and second printed circuit board (PCB) 16 are fixed on the objective lens support 4, and by such mode, movable member is supported by suspension.Adopt in such a way advantage and be the objective lens support material requirements not high, can reduce cost.Sometimes in order to improve performance and to reduce procedure of processing, can select the more expensive resistant to elevated temperatures objective lens support material of price, like this, suspension can directly be welded on the objective lens support, no longer needs two printed circuit board to do intermediate connecting part.
Fig. 4 has shown the another kind of arrangement of core component of the present invention.In the described embodiment of Fig. 1 a to Fig. 1 c, focusing coil is placed within the tracking tilt coil, and in the embodiment that Fig. 4 shows, first focusing coil 11 is placed on outside the first tracking tilt coil 12, and second focusing coil 15 is placed on outside the first tracking tilt coil 8.Because of the difference of production process can have different choice, if on objective lens support 4 directly coiling can adopt the former, on objective lens support 4, attach the good coil of coiling and can adopt the latter.In addition, Fig. 4 has shown that also first driving force produces the center symmetric arrangement relation between the system and the second driving force generation system, structure with respect to Fig. 1 c demonstration, the magnet of two driving force generation internal system and the position of coil have all carried out moving in the face of the position that claims, but still satisfy center symmetric arrangement requirement, it is in order to satisfy the result that the driving force balance requires that this center symmetric arrangement requires.

Claims (6)

1. the three-dimensional article mirror drive of a pitch drives mode, comprise fixed part, by being fixed on the outer yoke (13) on the fixed part and being fixed on the magnetic field generation system that four blocks of magnet on the outer yoke (13) are formed, and by the movable member that is fixed in the suspension support on the fixed part, described movable member comprises objective lens support (4), be located at the object lens (5) on the objective lens support (4), and four coils between described magnet, it is characterized in that: four blocks of magnet in the generation system of described magnetic field are respectively first and focus on inclination magnet (10), second focuses on inclination magnet (6), the first tracking magnet (3) and the second tracking magnet (9), wherein the first focusing inclination magnet (10) and the second focusing inclination magnet (6) are demarcated magnetized, the pole orientation that is the first half of magnet and Lower Half is opposite, and the first tracking magnet (3) and the second tracking magnet (9) have single pole orientation respectively;
Described four coils are respectively first focusing coil (11), second focusing coil (15), the first tracking tilt coil (12) and the second tracking tilt coil (8), the normal on the plane, annular place of described first focusing coil (11) is vertical with the normal on the plane, annular place of the first tracking tilt coil (12), and the normal on the plane, annular place of second focusing coil (15) is vertical with the normal on the plane, annular place of the second tracking tilt coil (8);
The described first tracking tilt coil (12), first focusing coil (11), first focus on inclination magnet (10) and the first tracking magnet (3) forms first driving force generation system, and described first focusing coil (11) next-door neighbour first focuses on inclination magnet (10) and places; The described second tracking tilt coil (8), second focusing coil (15), second focus on inclination magnet (6) and the second tracking magnet (9) forms second driving force generation system, and described second focusing coil (15) next-door neighbour second focuses on inclination magnet (6) and places; Described two driving force generation systems are center symmetric arrangement.
2. the three-dimensional article mirror drive of pitch drives mode according to claim 1 is characterized in that: the direction of magnetization of described four blocks of magnet all is parallel to the axial direction of suspension.
3. the three-dimensional article mirror drive of pitch drives mode according to claim 1 is characterized in that: the coiling central axes of described first focusing coil (11) and second focusing coil (15) is in the axial direction of suspension.
4. the three-dimensional article mirror drive of pitch drives mode according to claim 1 is characterized in that: described first focusing coil (11) be placed within the tracking tilt coil (12) or outside.
5. the three-dimensional article mirror drive of pitch drives mode according to claim 1 is characterized in that: described second focusing coil (15) be placed within the second tracking tilt coil (8) or outside.
6. the three-dimensional article mirror drive of pitch drives mode according to claim 1 is characterized in that: described first focusing coil (11) and second focusing coil (15) are wound into rectangle or coiled circle.
CNB2005100115735A 2005-04-15 2005-04-15 3D drive unit for object lens in new type oblique drive mode Expired - Fee Related CN100428345C (en)

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CN100428345C true CN100428345C (en) 2008-10-22

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1236946A (en) * 1998-05-21 1999-12-01 三星电子株式会社 Optical pickup apparatus
JP2002140828A (en) * 2000-08-22 2002-05-17 Tdk Corp Driving device for objective of optical pickup
EP1271494A2 (en) * 2001-06-19 2003-01-02 Samsung Electronics Co., Ltd. Optical pickup actuator
CN1406375A (en) * 2000-11-01 2003-03-26 皇家菲利浦电子有限公司 Optical scanning device comprising a tiltable lens system
US6574052B2 (en) * 2000-04-03 2003-06-03 Lg Electronics Inc. Optical pick-up actuator
JP2003168230A (en) * 2001-07-18 2003-06-13 Matsushita Electric Ind Co Ltd Optical pickup actuator and optical disk device
CN1479284A (en) * 2002-04-20 2004-03-03 Lg电子株式会社 Optical pick-up actuator
CN1573952A (en) * 2003-06-02 2005-02-02 三星电子株式会社 Optical pickup actuator and optical disk drive using the same and method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1236946A (en) * 1998-05-21 1999-12-01 三星电子株式会社 Optical pickup apparatus
US6574052B2 (en) * 2000-04-03 2003-06-03 Lg Electronics Inc. Optical pick-up actuator
JP2002140828A (en) * 2000-08-22 2002-05-17 Tdk Corp Driving device for objective of optical pickup
CN1406375A (en) * 2000-11-01 2003-03-26 皇家菲利浦电子有限公司 Optical scanning device comprising a tiltable lens system
EP1271494A2 (en) * 2001-06-19 2003-01-02 Samsung Electronics Co., Ltd. Optical pickup actuator
JP2003168230A (en) * 2001-07-18 2003-06-13 Matsushita Electric Ind Co Ltd Optical pickup actuator and optical disk device
CN1479284A (en) * 2002-04-20 2004-03-03 Lg电子株式会社 Optical pick-up actuator
CN1573952A (en) * 2003-06-02 2005-02-02 三星电子株式会社 Optical pickup actuator and optical disk drive using the same and method

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