CN1684162A - Optical pickup and disc drive device - Google Patents
Optical pickup and disc drive device Download PDFInfo
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- CN1684162A CN1684162A CNA2005100641618A CN200510064161A CN1684162A CN 1684162 A CN1684162 A CN 1684162A CN A2005100641618 A CNA2005100641618 A CN A2005100641618A CN 200510064161 A CN200510064161 A CN 200510064161A CN 1684162 A CN1684162 A CN 1684162A
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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
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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
- G11B7/0933—Details of stationary parts
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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
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0935—Details of the moving parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
Abstract
An objective lens driving device is to be improved in sensitivity and reduced in size and thickness. To this end, an objective lens driving device includes a stationary block arranged on a stationary plate provided on a movable base, a movable block holding an objective lens and moved along the focusing direction, the tracking direction and the tilt direction, support springs for supporting the movable block with respect to the stationary block, a first magnetic circuit for causing movement of the movable block along the focusing direction and along the tracking direction, and a second magnetic circuit for causing movement of the movable block along the tilt direction. The second magnetic circuit includes a pair of tilt magnets, each having two poles so that N poles and S poles lie along the tangential direction, and a pair of tilt coils facing the tilt magnets and each having an axis of winding wire direction along the tangential direction. The tilt magnets and the tilt coils are mounted to the movable block and the stationary block, respectively. An objective lens and the second magnetic circuit are arranged on the opposite sides along the tangential direction with the first magnetic circuit in-between.
Description
The cross reference of related application
The application comprises the relevant theme of Japanese patent application JP-2004-117647 of submitting to Jap.P. office with on April 13rd, 2004, and its content is hereby expressly incorporated by reference.
Technical field
The application relates to optical pickup apparatus and disk drive device.In particular to optical pickup apparatus with the drive unit that is used for object lens, wherein removable with respect to fixed block focus on, follow the tracks of and three directions that tilt on move; Also relate to disk drive device with optical pickup apparatus.
Background technology
Disk drive device record and/or duplicate the information signal of disc recording medium such as CD for example.This disk drive device is provided with optical pickup apparatus, and this optical pickup apparatus upwards moves in the footpath of disc recording medium, above laser radiation is arrived.
Optical pickup apparatus is provided with objective lens device, and by described objective lens device, object lens by removable maintenance move along focus direction, or move along tracking direction, accumulate on its recording channel to assemble the laser facula that is radiated on the disc recording medium via object lens.Focus direction is such direction, wherein the object lens by removable maintenance of objective lens device move by means of focusing on the recording surface of adjusting along it toward and away from disc recording medium, and tracking direction is roughly disc recording medium radially, and wherein object lens move in the direction to follow the tracks of and adjust.
The enforcement of optical pickup apparatus has realized the focusing adjustment of being undertaken by objective lens device and has followed the tracks of and adjust.Recently, developed a kind of objective lens device, be also referred to as three axial actuator, except the twin shaft of adjustment is adjusted and followed the tracks of to focusing to adjustment, by allowing removable recording surface to tilt with respect to disc recording medium, it realizes the adjustment to the surface plane deviation of the disc recording medium that rotates, to improve the servo-actuated feature of laser facula with respect to recording channel.Like this, utilize the objective driver become three axial actuator, removable along focus direction, tracking direction with along inclined direction move, and wherein this vergence direction is around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium.
So far, developed the device of following type as objective lens device (being called three axial actuator).
For example, keep removable of object lens to be used to make removable tilt coil that tilts with respect to fixed block to be set to removable, and be set on the fixed block in the face of the inclination magnet of tilt coil setting via support spring carrying movably on fixed block.Wherein the type of device that is set on removable of tilt coil is called the moving coil type device.
Utilize the coil form objective lens device that moves, need to be used to supply that drive current is used to focus on the focusing coil of adjustment, the tilt coil that is used to follow the tracks of the tracking coil of adjustment and be used for tilt adjustments is set to per two support springs, so that removable by having the fixed block carrying that adds up to six support springs.
On the other hand, use pattern is different from three axial actuator of moving coil type device, keep removable of object lens to support movably by fixed block via support spring, be used to make removable tilt coil that tilts with respect to fixed block to be set to fixed block simultaneously, and the inclination magnet towards the tilt coil setting is set to removable upward (for example, referring to patent publications 1 (Japanese publication publication 2000-222755)).The type of device that its medium dip magnet is set on removable is called moving magnet type device.
Utilize its medium dip magnet to be set to moving magnet type objective driver on removable, removable weight becomes greater than the weight of moving coil type device.Yet moving magnet type device does not need support spring to supply drive current to tilt coil, thereby compares with the moving coil type device, is goodish, because can reduce the quantity of parts part and can be convenient to assembly manipulation.
Summary of the invention
The objective lens device that utilization is described in patent publications 1, the inclination magnet that is set on removable has single N level and single S level, be set to tilt coil on the fixed block simultaneously and have winding core direction corresponding to focus direction, thereby the tilt coil of winding squarely form of tubes about 1/4th under the cooperation between the magnetic flux of the drive current that flows and magnet, removable is along inclined direction moved.Therefore, the part of tilt coil that is used for tilt adjustments is less, thereby device sensitivity reduces.
In order to prevent that sensitivity from reducing, be necessary to use magnet, or supply big drive current and give tilt coil with high magnetic force.Yet this has increased the manufacturing cost or the power consumption of objective lens device.
In addition, tilt coil should be arranged so that winding core circle direction, wherein correspondingly increase the space that tilt coil tangentially is installed corresponding to focus direction, and the mode to stop size to reduce, the tangential size of objective lens device increases.In addition, the bearing state of displaceable member is often unstable.
Utilize objective lens device, from the laser of light emitted via there being lifting (uplift) mirror on the removable opposite side of disc recording medium to be transmitted to object lens between being arranged on.In this case, if this journey such as coil or magnet circuit is for example arranged around the object lens setting, need be arranged on below the magnetic circuit on one side then be incident on the optical path that promotes the laser on the mirror from light emitted, the result is, compare with the demand that reduces its thickness, objective lens device thickness increases.Particularly, in the optical pickup apparatus in being set to portable telephone device, wherein high request is arranged, prevent that thickness from reducing is serious problem reducing thickness.
In order to overcome the problems referred to above, it is desirable to the objective lens device that provides a kind of sensitivity raising and size and thickness to reduce.
In order to address the above problem, the invention provides a kind of optical pickup apparatus and disk drive device, wherein objective lens device comprises: fixed head is arranged on the removable matrix; Fixed block is arranged on the fixed head, and is fastened to removable matrix; Removable, be used to keep object lens, and along focus direction (being direction) and along inclined direction toward and away from the recording surface of disc recording medium (being) around direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium with respect to fixed block work; A plurality of support springs support removable movably with respect to fixed block; First magnetic circuit makes removable to move along focus direction or along tracking direction; And second magnetic circuit, make removable along inclined direction to move.Second magnetic circuit comprises the pair of angled magnet, and each magnet all magnetizes polarity, so that the N utmost point and the S utmost point are along the focus direction setting.This radially separates each other to the inclination magnet.Second magnetic circuit comprises that also each tilt coil all has the axis corresponding to the winding wire direction of tangential direction towards this pair of angled coil to the setting of inclination magnet.This is set on removable the inclination magnet, and this is set on the fixed block tilt coil, and the object lens and second magnetic circuit tangentially are arranged on the both sides of first magnetic circuit simultaneously.
Therefore, utilize, can increase the part of the tilt coil that is used for tilt adjustments according to optical pickup apparatus of the present invention and disk drive device.
The present invention also provides a kind of optical pickup apparatus, and this optical pickup apparatus comprises: removable matrix along moving radially of disc recording medium, is loaded on the Pan Tai; And objective lens device, be arranged on the removable matrix.Objective lens device comprises: fixed head is arranged on the removable matrix; Fixed block is arranged on the fixed head, and is fastened to removable matrix; Removable, be used to keep object lens, and along focus direction (being the direction toward and away from the recording surface of disc recording medium), along tracking direction (be disc recording medium radially) and along inclined direction (being around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium) with respect to fixed block work; A plurality of support springs support removable movably with respect to fixed block; First magnetic circuit makes removable to move along focus direction or along tracking direction; And second magnetic circuit, make removable along inclined direction to move.Second magnetic circuit comprises the pair of angled magnet, and each magnet all magnetizes polarity, so that the N utmost point and the S utmost point are along the focus direction setting.This radially separates each other to the inclination magnet.Second magnetic circuit comprises that also each tilt coil all has the axis corresponding to the winding wire direction of tangential direction towards this pair of angled coil to the setting of inclination magnet.This is set on removable the inclination magnet, and this is set on the fixed block tilt coil.The object lens and second magnetic circuit tangentially are arranged on the both sides of first magnetic circuit.
Because tilt coil is arranged on the winding core direction of tangentially extending, thus the part that can be used for along inclined direction in removable, producing the tilt coil of thrust can be increased, thus improve removable sensitivity when tilt adjustments.
And, because removable sensitivity improves,, be supplied to the driving circuit of tilt coil can be littler simultaneously so needn't use magnet with stronger magnetic force, the result is to reduce the power consumption and the manufacturing cost of objective lens device.
In addition, because the winding core direction of tilt coil is not a focus direction,, therefore, can reduce the size of tangential objective lens device so tangential tilt coil installing space can be littler.
Because the object lens and second magnetic circuit are arranged on the tangential opposite side, first magnetic circuit is therebetween simultaneously, so can be arranged on the height level identical with first magnetic circuit promoting mirror, therefore, can correspondingly reduce the thickness of objective lens device.It is desirable especially that this thickness reduces at the optical pickup apparatus that is used for mobile device.
And,, be used for the support spring that supply of current is given tilt coil so can save, thereby reduce the quantity of parts part, and simplify the assembly work of objective lens device because inclination magnet and tilt coil are set to respectively on removable and the fixed block.
Because the part by crooked fixed head on the opposite side of tangential inclination magnet provides yoke, tilt coil is therebetween simultaneously, so the special-purpose oblique yoke of separation needn't be provided, the part that is used for fastening fixed block and oblique yoke simultaneously can be used jointly, thereby has reduced the quantity of parts parts.
Because the back yoke is arranged on the inclination magnet and it is on the surperficial facing surfaces of tilt coil, so may improve removable sensitivity when tilt adjustments.
On the other hand, can reduce the stray flux of inclination magnet, and second magnetic circuit do not influence by first magnetic circuit often, can prevent that removable is tilted with respect to fixed block simultaneously under the effect of stray flux.
The present invention also provides a kind of disk drive device, and this disk drive device comprises: Pan Tai is used for loading disc recording medium in the above; And optical pickup apparatus, be used for via object lens emission laser to the disc recording medium that is loaded on the Pan Tai.Optical pickup apparatus comprises: removable matrix along moving radially of disc recording medium, is loaded on the Pan Tai; And objective lens device, be arranged on the removable matrix.Objective lens device comprises: fixed head is arranged on the removable matrix; Fixed block is arranged on the fixed head, and is fastened to removable matrix; And removable, be used to keep object lens, and along focus direction (being the direction toward and away from the recording surface of disc recording medium), along tracking direction (be disc recording medium radially) and along inclined direction (being around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium) with respect to fixed block work.Objective lens device comprises a plurality of support springs, supports removable movably with respect to fixed block; First magnetic circuit makes removable to move along focus direction or along tracking direction; And second magnetic circuit, make removable along inclined direction to move.Second magnetic circuit comprises the pair of angled magnet, and each magnet all magnetizes polarity, so that the N utmost point and the S utmost point are along the focus direction setting.This radially separates each other to the inclination magnet.Second magnetic circuit comprises that also each tilt coil all has the axis corresponding to the winding wire direction of tangential direction towards this pair of angled coil to the setting of inclination magnet.This is set on removable the inclination magnet, and this is set on the fixed block tilt coil.The object lens and second magnetic circuit tangentially are arranged on the both sides of first magnetic circuit.
Because tilt coil is arranged on the winding core direction corresponding to tangential direction, thus be used for along inclined direction in the part of removable tilt coil that produces thrust bigger, thereby improve removable sensitivity when tilt adjustments.
And, because removable sensitivity improves,, can reduce the driving circuit that is supplied to tilt coil simultaneously so needn't use magnet with stronger magnetic force, the result is to reduce the power consumption and the manufacturing cost of objective lens device.
In addition, because the winding core direction of tilt coil is not a focus direction,, therefore, can reduce the size of tangential objective lens device so tangential tilt coil installing space can be littler.
Because the object lens and second magnetic circuit are arranged on the tangential opposite side, first magnetic circuit is therebetween simultaneously, so can be arranged on the height level identical with first magnetic circuit promoting mirror, therefore, can correspondingly reduce the thickness of objective lens device.It is desirable especially that this thickness reduces at the optical pickup apparatus that is used for mobile device.
In addition, because inclination magnet and tilt coil are set to respectively on removable and the fixed block, are used for the support spring that supply of current is given tilt coil so can save, thereby reduce the quantity of parts part, and simplify the assembly work of objective lens device.
Because the part by crooked fixed head on the opposite side of tangential inclination magnet provides yoke, tilt coil is therebetween simultaneously, so the special-purpose oblique yoke of separation needn't be provided, the part that is used for fastening fixed block and oblique yoke simultaneously can be used jointly, thereby has reduced the quantity of parts parts.
Because the back yoke is arranged on the inclination magnet and it is on the surperficial facing surfaces of tilt coil, so may improve removable sensitivity when tilt adjustments.
On the other hand, can reduce the stray flux of inclination magnet, and second magnetic circuit is not subject to first magnetic circuit influence, can prevents that removable is tilted with respect to fixed block simultaneously under the effect of stray flux.
Description of drawings
Fig. 1 illustrates enforcement best mode of the present invention in conjunction with Fig. 2 and Figure 12, particularly is the sectional view of disk drive device of the present invention.
Fig. 2 is the skeleton view that the amplification that the part of objective lens device decomposes is shown.
Fig. 3 is the enlarged perspective of objective lens device.
Fig. 4 illustrates power to advance base plate from the enlarged perspective of its objective lens device that separates.
Fig. 5 is the enlarged perspective that the objective lens device when the direction different with the view direction of Fig. 3 watched is shown.
Fig. 6 is the exploded perspective illustration that the amplification of fixed block is shown.
Fig. 7 is the enlarged perspective that the objective lens device when the direction different with the view direction of Fig. 3 watched is shown, and wherein its part is removed.
Fig. 8 is the enlarged perspective that first magnetic circuit and second magnetic circuit are shown.
Fig. 9 is the schematic side elevation that the amplification of objective lens device is shown.
Figure 10 is the synoptic diagram that is illustrated in the magnetic force direction under the situation that the back yoke is not provided.
Figure 11 is the synoptic diagram of explanation contingent operation under the situation that the back yoke is not provided.
Figure 12 is the synoptic diagram that is illustrated in the magnetic force direction under the situation that the back yoke is provided.
Embodiment
Now will be referring to the best mode of description of drawings according to optical pickup apparatus of the present invention and disk drive device.
As shown in fig. 1, disk drive device 1 comprises corresponding component and the unit in the shell 2.Formation dish inlet (not shown) in shell.
In shell 2, the chassis (not shown) is installed.Dish platform 3 is fastened to the motor shaft that is installed in the spindle motor on the chassis.
On the chassis, the guide shaft 4,4 that extends parallel to each other is installed, lead screw 5 (not shown) that rotate by feed screw are installed simultaneously.
Optical pickup apparatus 6 comprises removable matrix 7, be arranged on the optical device on the removable matrix 7 and be arranged on objective lens device 8 on the removable matrix 7.The end of removable matrix 7 is equipped with bearing 7a, 7b, and bearing 7a, 7b are supported slidably by guide shaft 4,4.
The nut piece (not shown) is arranged on the removable matrix 7.When lead screw 5 rotated by feed motor, nut piece feeding on the direction consistent with the rotation direction of lead screw 5 was so that optical pickup apparatus 6 is along being loaded into moving radially of disc recording medium 100 on the dish platform 3.
The yoke 9b that faces with each other, 9b surface-mounted has magnet 13,13.
Fixed head 10 with respect to base member 9 tangentially (towards the rear portion) divide and to be arranged, and be fastened to removable matrix 7.Fixed head 10 is formed by magnetic sheet of metallic material such as for example SPCC (stainless-steel cold-rolling thin plate) or silicon steel, and by the board substrate 10a that is fastened to removable matrix 7 with tiltedly yoke 10b, 10c form, tiltedly yoke 10b, 10c be from the leading section bending of board substrate 10a, and separate each other along radially (RAD) of disc recording medium 100.
Fixed block 11 is fastened to the board substrate 10a of fixed head 10.As shown in Figures 4 and 5, on the left end and right-hand member at the back side of fixed block 11, be provided with four terminal 11a, 11a altogether ..., these terminals are each other in the relation that is spaced vertically.
The lower end of fixed block 11 is provided with end pin (terminal pin) 11b, 11b, and these end pins protrude (referring to Fig. 4) from its back side towards the rear portion.These end pins 11b, 11b are spaced apart on left and right directions.
On the front surface of fixed block 11, be formed with forward outstanding location binding post 11c, 11c, these binding posts on left and right directions, separate each other (referring to Fig. 6).
On the rear surface of fixed block 11, relaying substrate 14 (referring to Fig. 4) is installed.Relaying substrate 14 is by essential part 14a and four coupling part 14b, 14b protruding from essential part 14a on left and right directions ... form.Coupling part 14b, the 14b of relaying substrate 14 ... forefront respectively with terminal 11a, 11a ... connect.
Pair of angled coil 16,16 is installed on the left and right sides of front surface of fixed block 11, that is to say, tilt coil is along radially the separating of disc recording medium 100 (referring to Fig. 3 and 6).By these tilt coils 16,16 being assemblied on location binding post 11c, the 11c on the front surface that is arranged on fixed block 11, and attach it on the fixed block 11.Therefore, be set on the fixed block 11, can be easy to tilt coil 16,16 is installed on the appropriate location of fixed block 11 by locating binding post 11c, 11c.
Be set to end pin 11b, 11b on the back side of fixed block 11 by winding, an end (see figure 4) of assembling tilt coil 16,16.
Relaying substrate 14 is installed to the rear surface of fixed block 11, and power supply board 17 is fixedly attached to relaying substrate 14, and power supply board 17 is connected to power circuit conversely, not shown (seeing Fig. 4 and Fig. 5).Power supply board 17 for example is a flexible printed circuit board, comprise four connecting portions (line) 17a, 17a ... and two connecting portions (line) 17b, 17b. Connecting line 17a, 17a ... by scolder 18,18 for example ... be connected to respectively relaying substrate 14 connecting line 14b, 14b ..., and connecting line 17b, 17b by scolder 19,19 for example ... be connected to an end of the tilt coil 16,16 that is assembled to end pin 11b, 11b.Therefore, be supplied to tilt coil 16,16 from the drive current that is used to carry out tilt adjustments of power circuit via connecting line 17b, the 17b of power supply board 17.
By this way, one end of tilt coil 16,16 twines end pin 11b, 11b, one end of tilt coil 16,16 is fixed to connecting line 17b, 17b by scolder 19,19, therefore, power supply board 17 can be fixed to tilt coil 16,16 easily, thereby simplified the operation that power supply board 17 is connected to tilt coil 16,16, and improved connection reliability.
Vertically extending yoke opening 11d, 11d (seeing Fig. 6 and Fig. 7) form towards the forward end of fixed block 11, are provided with oblique yoke 10b, the 10b of the fixed head 10 that imports from the below in the yoke opening.Tiltedly yoke 10b, 10b are set directly at the back of tilt coil 16,16.
Comprise movably retainer 21 and maintenance object lens 22 (seeing Fig. 3 to 5) thereon for removable 12.
Focusing coil 25 is used to make removable 12 to move along focus direction, just, towards with direction away from disc recording medium 100 on (the direction F among Fig. 3). Tracking coil 26,26 is used to make removable 12 to move along tracking direction, just, and on the direction of the radius of disc recording medium 100 (the direction T among Fig. 3) basically.
Each is rectangular tube form roughly in focusing coil 25 and the tracking coil 26,26, and focusing coil 25 has the coil core of extending at above-below direction (focus direction), and tracking coil 26,26 has the coil core of extending at fore-and-aft direction (tangential direction).Tracking coil 26,26 setting that separates each other in the front side of focusing coil 25.
The end of focusing coil 25 and tracking coil 26,26 be connected to two sides that are arranged on removable retainer 21 splicing ear 21a, 21a .... Splicing ear 21a, 21a ... be connected to support spring 20,20 ... forward end.Therefore, removable 12 by support spring 20,20 ... connect and be maintained hollow state.
In objective lens device 8, if removable 12 with respect to fixed block 11 by aforesaid support spring 20,20 ... be maintained hollow state, removable 12 is above-below direction the mobile of focus direction, removable 12 since its deadweight move down, support spring 20,20 ... bending, make support spring 20,20 ... front end be in the position lower than its rear end.Use objective lens device 8, removable 12 position that moves down because of its deadweight is set to the centre position along removable 12 focus direction.Therefore, in centre position along focus direction, the centre of the above-below direction of inclination magnet 29,29, just, the medium line M1 in the middle of magnetic pole is consistent with the middle M2 of the above-below direction of tilt coil 16,16.
Consider the factor of himself weight, by being its centre position along focus direction with removable 12 set positions, the change of removable 12 slope characteristic is accompanied by focus on to move, and therefore symmetry on above-below direction guarantees the reliability that the inclination of objective lens device 8 is moved.
In addition, just in case objective lens device 8 is used to the state that focus direction is not an above-below direction, it satisfies: be that removable 12 position is set to removable 12 centre position along focus direction under zero the situation at the drive current that the focusing coil 25 that is supplied to as focus servo is provided for removable 12.
The forward direction of the forward side of focusing coil 25 and tracking coil 26,26 and back are related with pair of magnets 13,13 to side, are fixed to the 9b of yoke portion, 9b (referring to Fig. 8).By magnet 13,13 is set by this way, form first magnetic coil 27 by magnet 13, the 9b of yoke portion, 9b, focusing coil 25 and by tracking coil 26,26, be used to make removable 12 to move in focus direction or at tracking direction.
At the rear side of the coil holder 24 of removable retainer 21, there be the back yoke 28,28 and the inclination magnet 29,29 of the assembling that is in the stacked vertical state, back yoke separates (referring to Fig. 2 and 3) at left and right directions and magnet.Inclination magnet 29,29 is geomagnetic into along N utmost point 29a, the 29a of focus direction and the S utmost point 29b, the 29b that separate with the N utmost point, as shown in Figure 2.
When from power circuit by power supply board 17, relaying substrate 14 and support spring 20,20 ... drive current was supplied to focusing coil 25 or tracking coil at 26,26 o'clock, move in focus direction (the direction F among Fig. 3) or at tracking direction (the direction T among Fig. 3) for removable 12, depend on the direction of the magnetic flux that produces among drive current direction and magnet 13,13 and the 9b of yoke portion, the 9b.
In addition, when drive current when power circuit is supplied to tilt coil 16,16 by power supply board 17, by the direction of drive current, move removable 12 at vergence direction (the direction R among Fig. 3) with the magnetic flux of back yoke 28,28 and inclination magnet 29,29 and oblique yoke 10b, 10b generation.Should be noted that at drive current to impose under the situation of tilt coil 16,16 that the thrust by the relative direction on removable left and right sides (above-below direction) produces influences tilt adjustment by removable of moving along vergence direction.
When removable 12 at focus direction, tracking direction, or when vergence direction moves, can make support spring 20,20 elastic deformations.
Promote the below (referring to Fig. 9) that mirror 31 is arranged on the object lens 22 that are assembled to removable supporter 21.
In above-mentioned disk drive device 1, rotate (not shown) along with the rotation of spindle motor as fruit tray platform 3, then at optical pickup apparatus 6 by record and/or duplicate disc recording medium 100 when the radius of disc recording medium 100 moves, the disc recording medium 100 that is assemblied on the dish platform 3 rotates.
If be supplied to focusing coil 25 at record and/or replicate run drive electric current, removable 12 of the objective lens device 8 focus direction F-F in Fig. 3 moves with respect to fixed block 11, by carrying out focus adjustment, make hot spot (not shown) perpendicular that light source penetrates and the laser that process object lens 22 shine assemble, overcome the bending of disc recording medium 100.
When drive current is supplied with tracking coil 26,26, removable 12 of objective lens device 8 moves with respect to fixed block 11 along tracking direction T-T, as shown in Figure 3, by carrying out focus adjustment, make hot spot that light source penetrates and the laser that process object lens 22 shine gather on the recording channel of disc recording medium 100.
When drive current is supplied to tilt coil 16,16, removable 12 of objective lens device 8 moves with respect to fixed block 11 along tracking direction R-R, as shown in Figure 3, by carrying out tilt adjustment, make hot spot that light source penetrates and the laser that process object lens 22 shine gather on the recording channel of disc recording medium 100.
Utilize aforesaid optical pickup apparatus 6, inclination magnet 29,29 with N utmost point 29a, 29a and S utmost point 29b, 29b of separating with the N utmost point along focus direction wherein is provided, the direction of the wound core of tilt coil 16,16 is tangential directions, pact half part 16a, 16a in the whole tilt coil 16,16 ... can be used as the part that produces thrust along removable 12, thereby in tilt adjustments, improve removable 12 susceptibility.
Because removable 12 susceptibility can be enhanced,, simultaneously, there is no need to supply strong drive current and give tilt coil 16,16, thereby lowered the manufacturing cost and the power consumption of objective lens device 8 so there is no need to use magnet with quite strong magnetic force.
In addition, because the direction of the winding core of tilt coil 16,16 is not a focus direction, the less assembly space that is used for tilt coil 16,16 along tangential direction is enough, has reduced the size of objective lens device.
And, utilize objective lens device 8, the object lens 22 and second magnetic circuit 30 that is used for tilt adjustments are along the couple positioned opposite that is used to carry out focus adjustment and follows the tracks of the tangential direction of first magnetic circuit of regulating 27, promote mirror 31 and can be in the height level identical with first magnetic circuit 27, therefore, objective lens device 8 can correspondingly reduce thickness.The optical pickup apparatus that reduces to be particularly suitable for being used for portable unit of thickness.
Adopt objective lens device 8, its medium dip magnet 29,29 provides to removable 12, tilt coil 16,16 is provided to fixed block 11, there is no need to be provided for providing the support spring of power to tilt coil 16,16, correspondingly reduce the quantity of element assembly, simplified the assembly technology of objective lens device 8.
In addition, adopt objective lens device 8, the fixed head 10 that is used for fastening fixed station 11 is bent, to form oblique yoke 10b, 10b, there is no need to provide the oblique yoke of special use, board substrate 10a and oblique yoke 10b, 10b as the element that is used for fastening fixed block 11 can be shared, further reduced the quantity of element assembly.
Adopt objective lens device 8, back yoke 28,28 be set at inclination magnet 29,29 with its on the surperficial facing surfaces of tilt coil 16,16.
The result is the susceptibility that has improved when carrying out tilt adjustment removable 12.
Except back yoke 28,28 was set, the relation of supposing the magnetic force direction that associated components produces then attracted the top of inclination magnets 29,29 as shown in figure 10 towards first magnetic circuit 27, and simultaneously, its underpart is repelled by first magnetic circuit 27.Therefore, inclination magnet 29,29 is subjected to moving downward the effect of power P, makes removable 12 to move down to influence focusing operation.
The paired tilt coil 16,16 that objective lens device 8 is provided with paired inclination magnet 29,29 and is arranged along recording channel direction (the direction T shown in Figure 11) and paired inclination magnet branch, make and operating under the situation about movable block 12 having been moved along tracking direction by following the tracks of, position relation between the inclination magnet 29,29 and first magnetic circuit 27 changes, make to be subjected under the situation of influence of first magnetic circuit 27 that the displacing force that acts on inclination magnet 29,29 left sides is different from the displacing force that acts on the right side at inclination magnet 29,29.In this case, worry that removable 12 is tilted in the direction shown in the R shown in Figure 11, make the optical axis of the laser by object lens 22 irradiations tilt at disc recording medium 100.
In addition, in objective lens device 8, if because manufacturing tolerance makes the elastic force difference of support spring 20,20 left and right sides, base member 9 be adjusted to usually along the position of tracking direction make removable 12 in the inclination that focuses on the R direction during moving with optimised (zero).In this case, position relation between the inclination magnet 29,29 and first magnetic circuit 27 can change once more, as mentioned above, the feasible displacing force that acts on the left side of inclination magnet 29,29 is different from the acting force that acts on the right side, makes movable block 12 to tilt in R direction as shown in figure 11.
Yet, adopt aforesaid objective lens device 8, wherein the back yoke 28,28 be set at inclination magnet 29,29 with its on the surperficial facing surfaces of tilt coil 16,16, reduce stray flux as shown in figure 12 from inclination magnet 29,29, so that second magnetic circuit 30 is not subject to the influence of first magnetic circuit 27, therefore may prevent that disc recording medium 100 from tilting in the R direction.
In aforementioned, will focus on respectively with tracking direction and be assumed to above-below direction and left and right directions.This only for purpose of explanation, the present invention is not limited to these specific directions.
Should be noted that the structure as given shape shown in the most preferred embodiment of the present invention and corresponding component only is exemplary, protection scope of the present invention is not subjected to the restriction of these exemplary shapes or structure.
That is to say that it will be appreciated by those skilled in the art that various variations, combination, sub-portfolio and change all can take place according to designing requirement and other factors, protection scope of the present invention only is subjected to the appended claim or the qualification of equivalent.
Claims (8)
1. optical pickup apparatus has: removable matrix, along being loaded in moving radially of disc recording medium on the Pan Tai; And objective lens device, be arranged on the described removable matrix; Wherein, described objective lens device comprises:
Fixed head is arranged on the described removable matrix;
Fixed block is arranged on the described fixed head, and is fastened to described removable matrix;
Removable, be used to keep described object lens, and along focus direction, along tracking direction with along inclined direction with respect to fixed block work, wherein, described focus direction is the direction toward and away from the recording surface of disc recording medium, described tracking direction be disc recording medium radially, described vergence direction is around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium;
A plurality of support springs are used for supporting removable movably with respect to described fixed block;
First magnetic circuit is used to make described removable to move along described focus direction or along described tracking direction; And
Second magnetic circuit is used to make described removable along inclined direction to move;
Described second magnetic circuit comprises
The pair of angled magnet, each magnet all magnetizes polarity, so that the N utmost point and the S utmost point be along the focus direction setting, this radially separates each other to the inclination magnet, to the pair of angled coil that the inclination magnet is provided with, each tilt coil all has the axis corresponding to the winding wire direction of tangential direction towards this;
This is set on described removable the inclination magnet;
This is set on the described fixed block tilt coil;
Described object lens and described second magnetic circuit tangentially are arranged on the both sides of described first magnetic circuit.
2. according to the described optical pickup apparatus of claim 1, wherein
By a part along tangential direction crooked described fixed head on the opposite side of described inclination magnet, make tilt coil therebetween simultaneously, form oblique yoke.
3. according to the described optical pickup apparatus of claim 1, wherein
Back yoke is arranged on and tilts magnet on the surperficial opposing inclined magnet surface of tilt coil.
4. optical pickup apparatus has: removable matrix, along being loaded in moving radially of disc recording medium on the Pan Tai; And objective lens device, be arranged on the described removable matrix; Wherein, described objective lens device comprises:
Fixed block is fastened to described removable matrix;
Removable, be used to keep described object lens, and along focus direction, along tracking direction with along inclined direction with respect to fixed block work, wherein, described focus direction is the direction toward and away from the recording surface of disc recording medium, described tracking direction be disc recording medium radially, described vergence direction is around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium;
A plurality of support springs are used for supporting removable movably with respect to described fixed block;
First magnetic circuit is used to make described removable to move along described focus direction or along described tracking direction; And
Second magnetic circuit is used to make described removable along inclined direction to move;
Described second magnetic circuit comprises
The pair of angled magnet, each magnet all magnetizes polarity, so that the N utmost point and the S utmost point be along the focus direction setting, this radially separates each other to the inclination magnet, and towards this pair of angled coil to the setting of inclination magnet, each tilt coil all has the axis corresponding to the winding wire direction of tangential direction;
This is set on described removable the inclination magnet;
This is set on the described fixed block tilt coil;
Back yoke, be arranged on described inclination magnet face on the surperficial opposing inclined magnet surface of described tilt coil.
5. disk drive device, described disk drive device comprises: Pan Tai is used for loading disc recording medium in the above; And optical pickup apparatus, being used for via object lens emissions laser to the disc recording medium that is loaded on the Pan Tai, optical pickup apparatus comprises: removable matrix, along being loaded into moving radially of disc recording medium on the Pan Tai; And objective lens device, be arranged on the removable matrix, wherein, objective lens device comprises:
Fixed head is arranged on the removable matrix;
Fixed block is arranged on the fixed head, and is fastened to removable matrix;
Removable, be used to keep described object lens, and along focus direction, along tracking direction with along inclined direction with respect to fixed block work, wherein, described focus direction is the direction toward and away from the recording surface of disc recording medium, described tracking direction be disc recording medium radially, described vergence direction is around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium;
A plurality of support springs are used for supporting removable movably with respect to fixed block;
First magnetic circuit is used to make removable to move along focus direction or along tracking direction; And
Second magnetic circuit is used to make removable along inclined direction to move;
Described second magnetic circuit comprises:
The pair of angled magnet, each magnet all magnetizes polarity, so that the N utmost point and the S utmost point be along the focus direction setting, this radially separates each other to the inclination magnet, and towards this pair of angled coil to the setting of inclination magnet, each tilt coil all has the axis corresponding to the winding wire direction of tangential direction;
This is set on removable the inclination magnet;
This is set on the fixed block tilt coil;
Described object lens and described second magnetic circuit tangentially are arranged on the both sides of described first magnetic circuit.
6. disk drive device according to claim 4, wherein
By a part along tangential direction crooked described fixed head on the opposite side of described inclination magnet, make tilt coil therebetween simultaneously, oblique yoke is set.
7. disk drive device according to claim 4, wherein
Back yoke be arranged on described inclination magnet on the surperficial opposing inclined magnet surface of described tilt coil.
8. disk drive device, described disk drive device comprises: Pan Tai is used for loading disc recording medium in the above; And optical pickup apparatus, being used for via object lens emissions laser to the disc recording medium that is loaded on the Pan Tai, optical pickup apparatus comprises: removable matrix, along being loaded into moving radially of disc recording medium on the Pan Tai; And objective lens device, be arranged on the described removable matrix, wherein, described objective lens device comprises:
Fixed block is fastened to described removable matrix;
Removable, be used to keep described object lens, and along focus direction, along tracking direction with along inclined direction with respect to fixed block work, wherein, described focus direction is the direction toward and away from the recording surface of disc recording medium, described tracking direction be disc recording medium radially, described vergence direction is around the direction along the axis that extends perpendicular to the tangential direction radially of disc recording medium;
A plurality of support springs are used for supporting removable movably with respect to fixed block;
First magnetic circuit is used to make removable to move along focus direction or along tracking direction; And
Second magnetic circuit is used to make removable along inclined direction to move;
Described second magnetic circuit comprises:
The pair of angled magnet, each magnet all magnetizes polarity, so that the N utmost point and the S utmost point be along the focus direction setting, this radially separates each other to the inclination magnet, and towards this pair of angled coil to the setting of inclination magnet, each tilt coil all has the axis corresponding to the winding wire direction of tangential direction;
This is set on removable the inclination magnet;
This is set on the fixed block tilt coil;
Back yoke, be arranged on described inclination magnet on the surperficial opposing inclined magnet surface of described tilt coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP117647/04 | 2004-04-13 | ||
| JP2004117647A JP4244021B2 (en) | 2004-04-13 | 2004-04-13 | Optical pickup and disk drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1684162A true CN1684162A (en) | 2005-10-19 |
| CN100358018C CN100358018C (en) | 2007-12-26 |
Family
ID=35239308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100641618A Expired - Fee Related CN100358018C (en) | 2004-04-13 | 2005-04-13 | Optical pickup and disc drive device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20050249054A1 (en) |
| JP (1) | JP4244021B2 (en) |
| KR (1) | KR20060046636A (en) |
| CN (1) | CN100358018C (en) |
| TW (1) | TW200606898A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013069389A (en) | 2011-09-26 | 2013-04-18 | Sanyo Electric Co Ltd | Objective lens drive device and optical pickup device with the same |
| WO2015093186A1 (en) | 2013-12-20 | 2015-06-25 | ソニー株式会社 | Optical pickup, disk drive device, and optical element drive device |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60239939A (en) * | 1984-05-14 | 1985-11-28 | Hitachi Ltd | Object lens driving device |
| SG72954A1 (en) * | 1998-05-21 | 2000-05-23 | Samsung Electronics Co Ltd | Optical pickup |
| US6341104B1 (en) * | 1998-08-03 | 2002-01-22 | Matsushita Electric Industrial Co., Ltd. | Optical pickup apparatus of tilt control type |
| JP2000222755A (en) * | 1999-01-29 | 2000-08-11 | Matsushita Electric Ind Co Ltd | Optical pickup device |
| US20010021164A1 (en) * | 2000-03-13 | 2001-09-13 | Matsushita Electric Industrial Co., Ltd. | Objective lens driving apparatus |
| KR100684012B1 (en) * | 2000-04-03 | 2007-02-20 | 엘지전자 주식회사 | Optical pick up actuator |
| JP3550547B2 (en) * | 2001-01-22 | 2004-08-04 | シャープ株式会社 | Objective lens drive |
| JP3494165B2 (en) * | 2001-04-24 | 2004-02-03 | 日本電気株式会社 | Object lens drive mechanism for optical disk drive |
| JP3912292B2 (en) * | 2002-04-08 | 2007-05-09 | ソニー株式会社 | Optical pickup and disk drive device |
| KR20030080801A (en) * | 2002-04-11 | 2003-10-17 | 삼성전기주식회사 | Optical pick up actuator having triaxial driving function |
| JP2003346368A (en) * | 2002-05-23 | 2003-12-05 | Ricoh Co Ltd | Objective lens actuator, optical pickup and optical disc device |
| JP4097257B2 (en) * | 2003-01-31 | 2008-06-11 | 株式会社リコー | Tilt correction method, tilt correction apparatus, and optical disc apparatus |
-
2004
- 2004-04-13 JP JP2004117647A patent/JP4244021B2/en not_active Expired - Fee Related
-
2005
- 2005-03-30 US US11/092,937 patent/US20050249054A1/en not_active Abandoned
- 2005-04-08 KR KR1020050029382A patent/KR20060046636A/en not_active Application Discontinuation
- 2005-04-11 TW TW094111411A patent/TW200606898A/en not_active IP Right Cessation
- 2005-04-13 CN CNB2005100641618A patent/CN100358018C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060046636A (en) | 2006-05-17 |
| TWI300222B (en) | 2008-08-21 |
| US20050249054A1 (en) | 2005-11-10 |
| TW200606898A (en) | 2006-02-16 |
| JP4244021B2 (en) | 2009-03-25 |
| CN100358018C (en) | 2007-12-26 |
| JP2005302161A (en) | 2005-10-27 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20071226 Termination date: 20100413 |