CN1337679A - Four-dimensional objective driver - Google Patents
Four-dimensional objective driver Download PDFInfo
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- CN1337679A CN1337679A CN 01129218 CN01129218A CN1337679A CN 1337679 A CN1337679 A CN 1337679A CN 01129218 CN01129218 CN 01129218 CN 01129218 A CN01129218 A CN 01129218A CN 1337679 A CN1337679 A CN 1337679A
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- movable member
- coil
- sliding axle
- magnet
- objective driver
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Abstract
The present invented apparatus comprises movable component, coil, sliding shaft and internal magnetic yoke, external magnetic yoke and magnet which are used for forming magnetic circuit, and the top of said sliding shaft is made into a ring structure, and the connection of movable component and ring structure of top of sliding shaft is made into the form of sleeve structure. The interior of the described movable component is equipped with magnetic matter, and these movable components are arranged along the axis of the described sliding shaft in the mode of symmetrical structure. Said invention possesses high reproduction quality and high accuracy for positioing in focussing direction and track-searching direction, and features simple structure and low cost, etc.
Description
The invention belongs to field of optical disc technology, the design that particularly has focusing, seeks the objective lens device of rail and inclination four-dimensional movement servo function.
In recent years, much had the objective lens device that focuses on and seek rail two dimension function and announced, but along with the raising of CD density, the precision that reads of CD had also been had higher requirement.Objective lens device is shaken reading the error of causing except needing tracking illumination disk eccentricity, vertical direction, also to follow the tracks of the irregular warpage of CD, the error that the inclination shake causes, the patent that spring cantilever type four-dimensional objective torquer has been arranged at present, the design feature of this patent is: the flexible member of two orthogonal connections is set, the location the when movable member that dangles is realized no current respectively on the movable member both sides with object lens; Energising back stressed generation moment of flexure of flexible member and moment of torsion, drive object lens and realize the object lens four-dimensional movement, this structure is very high to the material and the level of processing requirement of flexible member, and carries out in the four-dimensional movement process at described flexible member, very easily produces the phase mutual interference of direction of motion.
Disclose a kind of torquer structure with two-dimentional servo function in the patent No. is the invention of CN1181580A, this structure is utilized maglev principle, makes movable member be suspended in the magnetic field and can realize along sliding axle up and down and the two-dimensional motion of rotating around sliding axle.The freedom of motion and not being suitable for that this invention makes movable member only have two dimension need carry out the reading system of three-dimensional above servo super-high density CD.
The objective of the invention is to,, provide a kind of four-dimensional objective driver for overcoming the weak point of prior art.Its object lens not only focus direction and seek the location of rail direction can high repeatability and carry out, and have the kinetic characteristic of tracking disc tilt accurately, and have that the number of parts is few, cost is low, simple and compact for structure, easy machining characteristics.
The present invention proposes a kind of four-dimensional objective driver, and it comprises: one is equipped with the movable member that is used for light beam is focused to the object lens on the CD; Be used to drive this movable member and carry out the coil that two dimension is rotated and upper and lower translation moves; Be parallel to the optical axis direction of these object lens and be used to support and guide a sliding axle of described movable member; Be used to form inner yoke, outer yoke, the magnet of magnetic circuit; It is characterized in that the top of described sliding axle is a chondritic; Movable member is a tube-in-tube structure with the chondritic junction on axle top; In the described movable member magnetisable material is set, it becomes symmetrical structural arrangements along the axis of described sliding axle.
Described coil can be divided into to be sought path circle and focusing and follows the tracks of two groups of tilt coils, and all coils is provided with coaxially with the angular separation that is about 90 degree around described sliding axle.
The described bottom of seeking the path circle and described focusing and a side of following the tracks of tilt coil can face respectively described magnet up and down and about axis of symmetry.
Described magnetisable material can be cross shape.
The sphere on described axle top can be clearance fit with the sleeve of described movable member.
Principle of work of the present invention as shown in Figure 1, the magnet of magnet 101 with driving action for having permanent magnetism, around it, form bipolarity, ferromagnetic material 109 is in the magnetic field of magnet 101 formation that are symmetrical distribution, make magnetisable material 109 be subjected to magneticaction upwards, if the effect that magnetizes of magnet 101 is suitable, it is certain position in the magnetic field of axle that magnetisable material 109 suffered magnetic field force in magnetic field is enough to itself be suspended in movable member 107 and magnetisable material 109 with sliding axle 106.So, object lens 108 can with respect to sliding axle 106 along sliding axle axially and radially move with movable member 107.
Glomeration is done on the top of sliding axle 106, and because the spheroidite contact portion at movable member 107 and sliding axle 106 tops is designed to tube-in-tube structure, leave certain space between the sleeve part of sliding axle 106 and movable member 107, sliding axle 106 can limit the translation of movable member 107 in radial direction, make movable member 107 can realize controlling the function that object lens are followed the tracks of the four-dimensional position deviation of CD thus again along the banking motion of the carrying out two dimension of the spherical surface direction of sliding axle.
Be distributed with coil 104 and 105 around the movable member 107.Realize to focus on and the coil 104 of two-dimentional banking motion with respect to sliding axle 106 with the angle center balanced configurations of 90 degree around movable member 107.The top of coil is arranged in the magnetic field that magnet 101 forms, and bottom is positioned at this magnetic field lower limb.When relative two coils that become 180 degree in the coil 104 passed to the opposite electric current of equal and opposite in direction, direction, coil stressed generation moment of couple in magnetic field made movable member 107 produce deflection in a direction; When passing to the equidirectional electric current, stressed movable member 107 upper and lower translations that make of coil are realized focus movement.The coil 105 that the rail motion is sought in realization has two, become 180 degree to distribute, coil 105 has only a side to be arranged in magnet 101 magnetic field that forms, it is passed to electric current, the stressed limit of two coils produces and makes the moment of couple of movable member 107 around sliding axle 106 rotations, thereby realizes that the rail of seeking that CD reads in the process moves.
Characteristics of the present invention:
Objective lens device of the present invention has focusing, tracks, and follows the tracks of shake, and totally four degree of freedom can be implemented in the motion that four-dimensional direction is followed the tracks of the CD information faces.
Four-dimensional objective driver of the present invention can drive described object lens and finish focusing, seeks rail and follow the tracks of the effect that the CD two dimension tilts.Magnetisable material is placed on radially perpendicular in the plane that constitutes the magnetic gap plane, leakage flux by magnetic circuit outside magnetic gap forms magnet spring, realize the location of movable member 107, the top is sliding axle 106 supports of sphere and the motion of guiding movable member 107, the deflection angle of movable member 107 and electrical current size are linear basically, are easy to realize High Accuracy Control.In addition, part count is few, and is simple in structure, can reduce cost.
Brief Description Of Drawings:
Fig. 1 is the planimetric map of movable member of the present invention in the axial direction suspension theory;
Fig. 2 is the structural plan figure of embodiments of the invention;
Fig. 3 is the cut-open view of the structure of present embodiment along Fig. 2 A-A line;
Fig. 4 is the distributed architecture synoptic diagram of coil on movable member of present embodiment.
A kind of four-dimensional objective driver embodiment of the present invention's design is described in detail as follows its structure and characteristics in conjunction with the accompanying drawings:
The general structure of the embodiment of the invention is shown in Fig. 2,3, and Fig. 3 is the cut-open view of Fig. 2, and wherein, block magnet 201 has 4, is distributed in the outer yoke 202 with 90 even angle of spending; 202 one-tenth of outer yokes are bowl-shape, in order to place all parts and as magnetic conductive part; The inner yoke 203 of tubular is in order to form magnetic loops jointly with outer yoke 202; Finish focusing and follow the tracks of CD having 4, dispose in pairs with magnet 201 at the drive coil 204 of the two-dimensional directional effect of tilting; Finish the coil 205 of seeking the rail effect and have 2, become being distributed on the movable member 207 of symmetry; Described coil 204,205 is all anchored at the periphery of movable member 207, and their position relation as shown in Figure 4; Sliding axle 206 is fixed on the center of outer yoke 202; Movable member 207 also is the support component of lens 208; Object lens 208 are used for focused beam; Magnetisable material 209, its effect are location movable member 207 and the top coil and the position of object lens.
In the present embodiment, object lens 208 are housed on movable member 207, support and guiding movable member 207 by sliding axle 206.The magnetic circuit of being made up of magnet 201, outer yoke 202 and inner yoke 203 is used for producing enough magnetic flux in yoke 202, and the magnetic line of force is vertically passed as the coil 205 of seeking the rail effect and the coil 204 of finishing focusing, oblique servo effect.
Glomeration is done on the top of sliding axle 206, and because the spheroidite contact portion at movable member 207 and sliding axle 206 tops is designed to tube-in-tube structure, owing in movable member 207, be provided with magnetisable material 209, with the common magnet spring that forms of described magnetic circuit, movable member 207 is suspended in the magnetic field, and touch with the spherical side edge at sliding axle 206 tops, and certain clearance is arranged with the top of sphere, with think movable member 207 mutually down motion the space is provided; Globulate is done on the top of sliding axle 206, has both limited movable member in radially displacement, guarantees again that movable member 207 can have the freedom of motion of four direction.
The distributed architecture of coil 204,205 on movable member 207 of present embodiment as shown in Figure 4.In Fig. 4, a side 2051 in one group of coil 205 of finishing to seek the rail effect face magnet 201 to becoming axis 2011, another side is facing to 201 edge of magnet; Finish focus on and the coil 204 of oblique servo effect in bottom 2041 face another axis of symmetry 2012 of magnet 201, the top faces toward the coboundary of magnet 201.When seeking the electric current that passes to equidirectional in the path circle 205 for two, produce the moment of couple of equidirectional in the coil 205, drive movable member 207 and rotate around sliding axle 206 (referring to Fig. 3); When current reversal, drive movable member 207 and rotate round about; Pass to the electric current of equidirectional when the coil 204 that two groups (four) are finished focusing, tilt function, because coil has only one side to be arranged in magnetic field in the both sides up and down, so the electromagnetic force direction that produces is identical, resultant direction makes progress or, realizes focusing operation thus downwards; When the coil 205 that a group (two relative coils) finished focusing, tilt function passes to the opposite electric current of direction, electromagnetic force forms the couple that the sphere around sliding axle 206 tops tilts to rotate, realize thus to CD radially with tangential two-dimentional oblique servo.
Claims (5)
1, a kind of four-dimensional objective driver, it comprises: one is equipped with the movable member that is used for light beam is focused to the object lens on the CD; Be used to drive this movable member and carry out the coil that two dimension is rotated and upper and lower translation moves; Be parallel to the optical axis direction of these object lens and be used to support and guide a sliding axle of described movable member; Be used to form inner yoke, outer yoke, the magnet of magnetic circuit; It is characterized in that the top of described sliding axle is a chondritic; This movable member is a tube-in-tube structure with the chondritic junction on axle top; In the described movable member magnetisable material is set, it becomes symmetrical structural arrangements along the axis of described sliding axle.
According to the four-dimensional objective driver of claim 1, it is characterized in that 2, described coil is divided into to be sought path circle and focusing and follow the tracks of two groups of tilt coils, all coils is provided with coaxially with the angular separation that is about 90 degree around described sliding axle.
3, according to the four-dimensional objective driver of claim 2, it is characterized in that, the described bottom of seeking the path circle and described focusing and a side of following the tracks of tilt coil face respectively described magnet up and down and about axis of symmetry.
According to the four-dimensional objective driver of claim 1, it is characterized in that 4, described magnetisable material is a cross shape.
According to the four-dimensional objective driver of claim 1, it is characterized in that 5, the sphere on described axle top and the sleeve of described movable member are clearance fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011292180A CN1138262C (en) | 2001-06-15 | 2001-06-15 | Four-dimensional objective driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011292180A CN1138262C (en) | 2001-06-15 | 2001-06-15 | Four-dimensional objective driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1337679A true CN1337679A (en) | 2002-02-27 |
| CN1138262C CN1138262C (en) | 2004-02-11 |
Family
ID=4669010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011292180A Expired - Fee Related CN1138262C (en) | 2001-06-15 | 2001-06-15 | Four-dimensional objective driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1138262C (en) |
-
2001
- 2001-06-15 CN CNB011292180A patent/CN1138262C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1138262C (en) | 2004-02-11 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |