CN1767014A - Optical pickup and disc drive apparatus - Google Patents
Optical pickup and disc drive apparatus Download PDFInfo
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- CN1767014A CN1767014A CN 200510099936 CN200510099936A CN1767014A CN 1767014 A CN1767014 A CN 1767014A CN 200510099936 CN200510099936 CN 200510099936 CN 200510099936 A CN200510099936 A CN 200510099936A CN 1767014 A CN1767014 A CN 1767014A
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Abstract
An objective lens actuator has a fixed block fixedly mounted on a movable base and a movable block movable with respect to the fixed block in focusing directions toward and away from recording surfaces of the disc-shaped recording mediums and tracking directions which are substantially radial directions of the disc-shaped recording mediums. A first objective lens is mounted on the movable block for focusing a first laser beam onto the recording surface of a digital versatile disc or a compact disc. A second objective lens is mounted on the movable block for focusing a second laser beam, which has a wavelength shorter than the first laser beam, onto the recording surface of a Blu-ray Disc. The first objective lens and the second objective lens are spaced from each in a tangential direction of recording tracks on the disc which is perpendicular to the focusing directions and the tracking directions. The first or second objective lens has a center positioned on a line which passes through the center of the disc and which extends in the radial directions of the disc. The first objective lens has a center positioned on a line which passes through the center of the second objective lens and which extends in the tangential direction.
Description
The cross reference of related application
The present invention comprises on September 13rd, 2004 at the Japanese patent application JP2004-265381 of Jap.P. office submission and the theme that related at the Japanese patent application JP2004-322338 of Jap.P. office submission on November 5th, 2004, and the full content of these two applications is hereby incorporated by.
Background technology
The present invention relates to a kind of light picker and optical disc apparatus, more particularly, relate to and a kind ofly have the light picker of objective lens actuator and combine so that play the optical disc apparatus of number of different types CD with this light picker, wherein objective lens actuator holds two object lens.
Optical disc apparatus with information signal recording on the disc like recording such as CD, magneto-optic disk etc. and from this disc recording medium Copy Info signal.This optical disc apparatus has and can and laser beam be applied to the light picker of disc recording medium in the radially traversing of disc recording medium.
Light picker has the objective lens actuator that is used to regulate object lens, and these object lens are fixed on the movable piece.Thereby objective lens actuator with object lens along focus direction towards with away from the record surface of disc recording medium move and carry out focus adjustment.Thereby objective lens actuator also moves object lens object lens and carries out magnetic track and regulate along seeking the rail direction, and this seeks roughly radially identical with disc recording medium of rail direction.Therefore when objective lens actuator is controlled object lens, the laser beam that offers disc recording medium by object lens focuses on the disc recording medium and follows the trail of recording track on this disc recording medium.
In recent years, it is developed to have various types of disc recording mediums of different recording density and cladding thickness.These dissimilar disc recording mediums comprise, for example can be about compact disk (CD) that the laser beam of 780nm plays, can be about Digital video disc (DVD) that the laser beam of 660nm plays, can be about the Blu-ray Disc (BD) that the laser beam of 405nm is play by wavelength by wavelength by wavelength.
A kind ofly be used on dissimilar multiple disc recording mediums recording information signal and from the light picker of this disc recording medium Copy Info signal, wherein this disc recording medium can be play by means of the different wavelength of laser bundle, described light picker have with for example Japanese patent laid-open 9-35304 (hereinafter being referred to as patent documentation 1) in two object lens using together of disclosed different disc recording mediums.
Thereby the light picker in the patent documentation 1, different wavelength of laser bundle all be by two object lens focusings on the record surface of each disc recording medium with information signal recording on this disc recording medium and from this disc recording medium Copy Info signal.
The tangent direction of the recording track of two object lens on the disc recording medium is installed on each apart position of movable piece, and this tangent direction radially, also is the radially traversing direction of light picker at disc recording medium perpendicular to disc recording medium.Because two object lens are separated from one another on described tangent direction, movable piece in the footpath of disc recording medium upwards by balance well, so that make the maximizing performance of objective lens actuator.
The disc recording medium of some type has the penetralia recording track Tp that is positioned at the diverse location place.So it is desirable to, design light picker in view of this different penetralia recording track Tp that locate.
In the past, some traditional CD drive can with information signal recording at two types CD, also be Copy Info signal on CD and the DVD and from the recording disk of the type.
If disclosed CD laser beam and the shared optical path that is made of object lens, collimation lens etc. of DVD laser beam among the Japanese patent laid-open 2002-298869 (hereinafter being referred to as patent documentation 2) can reduce the size with the CD drive of CD and DVD compatibility so.
In recent years, wavelength available is about the Blu-ray Disc (registered trademark) that the royal purple laser beam of 405nm plays and has obtained using.Want the wavelength of much shorter to play because Blu-ray Disc (BD) utilizes than the wavelength of playing the used laser beam of CD in the past, the registering capacity of BD is many times with diameter DVD.In recent years, can play CD, the three-wavelength CD drive of DVD and BD also obtains using.
Yet, be 405nm owing to play the wavelength of the laser beam of BD, and it is different from the wavelength of the laser beam of play CD and DVD greatly, so be difficult to design a kind of and object lens these three kinds of wavelength compatibilities.Therefore, practicablely to the three-wavelength CD drive be, make this three-wavelength CD drive have the light picker that combines with two object lens, one of them is used for BD, another is used for CD and DVD.
If the optical path of the laser beam of the optical path of the laser beam of playing BD and play CD and DVD is separated from each other fully, the three-wavelength CD drive just is easy to design so.But it is excessive that the size of light picker can become.Wherein a kind of scheme is to be used for BD and to be used for CD and two object lens of DVD are supported on the single two-axis adjuster of three-wavelength light picker, so that the laser beam that optical path provided that optical path that BD is used and CD and DVD use is applied to separately on the object lens.
The three-wavelength light picker of Gou Chenging needs two-face mirror like this, and wherein one side is used for BD, another side is used for CD and DVD, so that laser beam is offered each object lens.Two-axis adjuster is the labyrinth that comprises lens supporting device, drive coil etc., thereby narrow laser beam is offered two-axis adjuster.Especially, low profile CD drive of using in notebook PC or so-called elongated driver thickness are limited, thereby be difficult to make the lower light picker of self profile, wherein the limited thickness of driver is restricted the scope of the laser beam that is applied to two-axis adjuster.
The purpose of this invention is to provide a kind of light picker that addresses the above problem, it be easy to the design, can be effectively mobile, can with multi-wavelength's compatibility, profile is lower, size is less, optical disc apparatus can combine with this light picker.
Summary of the invention
According to the present invention, each in light picker and the optical disc apparatus has objective lens actuator.Objective lens actuator has and is fixedly mounted on movable suprabasil fixture and can and seeks the movable piece that the rail direction moves along focus direction with respect to this fixture, towards moving with record surface away from disc recording medium, this seeks the rail direction and is essentially disc recording medium radially this movable piece along focus direction.First object lens are installed on the movable piece, are used for first laser beam is focused on wherein a kind of record surface of disc recording medium.Second object lens are installed on the movable piece, be used for second laser beam is focused on the record surface of another kind of disc recording medium, the wavelength of this second laser beam is shorter than first laser beam, and the type of described another kind of disc recording medium is different from described wherein a kind of disc recording medium.First object lens and second object lens are apart on the tangent direction of the recording track of disc recording medium, and this tangent direction is perpendicular to focus direction and seek the rail direction.Being centered close on the straight line of first or second object lens, this straight line are passed the center that is installed in the disc recording medium on the CD platform selectively and along the radially extension of disc recording medium.Being centered close on the straight line of first object lens, this straight line are passed the center of second object lens and are extended along described tangent direction.
Adopt above-mentioned configuration, light picker is towards the mobile minimum of Spindle Motor, and this Spindle Motor is in order to the rotary CD platform.
Light picker also comprises: first laser beam sources that is used to launch first laser beam, be used to launch second laser beam sources of second laser beam, be used for first laser beam that first laser beam sources is launched is guided to first optical path of first object lens, be used for second laser beam that second laser beam sources is launched is guided to second optical path of second object lens, the optical path combiner that is used for built-up section first optical path and second optical path is with the optical path separation vessel that is used for will being separated with second optical path by part first optical path of described optical path combiner combination in the front of first object lens and second object lens.
First object lens and second object lens all are installed on the objective lens actuator that serves as two-axis adjuster, the optical path combiner before first laser beam and second laser beam are introduced into objective lens actuator, built-up section first optical path and second optical path.
Because first optical path and second optical path are combined each other before objective lens actuator, and it is separated from one another before first and second object lens, utilize low profile so and have narrow objective lens actuator can construct low profile and can with the light picker of multi-wavelength's compatibility, described limited range is for introducing the scope of laser beam.
Especially, according to the invention provides a kind of light picker, being used for having separately, at least two kinds of laser beam of wavelength are applied to one of at least two kinds of dissimilar disc recording mediums selectively, this disc recording medium is installed in the CD platform selectively, described light picker comprises: can be in the radially traversing movable substrate of disc recording medium, and this disc recording medium is installed on the CD platform selectively; Be installed in movable suprabasil objective lens actuator.Described objective lens actuator comprises: be fixedly mounted on movable suprabasil fixture; Can and seek the movable piece that the rail direction moves along focus direction with respect to fixture, this focus direction be towards with direction away from the record surface of disc recording medium, the described rail direction of seeking is roughly disc recording medium radially; Be installed in first object lens on the movable piece, be used for first laser beam is focused on wherein a kind of record surface of disc recording medium; With second object lens that are installed on the movable piece, be used for second laser beam is focused on the record surface of another kind of disc recording medium, the wavelength of this second laser beam is shorter than described first laser beam, and the type of described another kind of disc recording medium is different with described wherein a kind of disc recording medium; First object lens and second object lens are apart on the tangent direction of the recording track of disc recording medium, and this tangent direction is perpendicular to focus direction and seek the rail direction; Being centered close on the straight line of first or second object lens, this straight line pass the center of disc recording medium and along the radially extension of disc recording medium, wherein said disc recording medium is installed on the CD platform selectively; Being centered close on the straight line of first object lens, this straight line are passed the center of described second object lens and are extended along described tangent direction.
In above-mentioned light picker, the end that light picker is shifted to the stroke of CD platform can be made as at a distance of Spindle Motor position farthest.Light picker can be designed so that easily that movable substrate and Spindle Motor keep not contacting each other.Therefore light picker can be easy to design and can reduce the cost manufacturing.
Light picker can minimize to the distance that the CD platform moves, and makes moving effectively of light picker thus.
The present invention also provides a kind of optical disc apparatus, is used for playing selectively one of at least two kinds of dissimilar disc recording mediums, and this device comprises: the CD platform is used for selectively disc recording medium being installed on it; Light picker is used for that at least two kinds of laser beam of wavelength are applied to one of at least two kinds of dissimilar disc recording mediums selectively with having separately, and this disc recording medium is installed on the described CD platform selectively.Described light picker comprises: can be in the radially traversing movable substrate of disc recording medium, and this disc recording medium is installed on the CD platform selectively; Be installed in movable suprabasil objective lens actuator.Described objective lens actuator comprises: be fixedly mounted on movable suprabasil fixture; Can and seek the movable piece that the rail direction moves along focus direction with respect to fixture, towards moving with record surface away from disc recording medium, the described rail direction of seeking is roughly disc recording medium radially to this movable piece along focus direction; Be installed in first object lens on the movable piece, be used for first laser beam is focused on wherein a kind of record surface of disc recording medium; With second object lens that are installed on the movable piece, be used for second laser beam is focused on the record surface of another kind of disc recording medium, the wavelength of this second laser beam is shorter than described first laser beam, and the type of described another kind of disc recording medium is different with described wherein a kind of disc recording medium; First object lens and second object lens are apart on the tangent direction of the recording track of disc recording medium, and this tangent direction is perpendicular to described focus direction and the described rail direction of seeking; Being centered close on the straight line of first or second object lens, this straight line pass the center of disc recording medium and along the radially extension of disc recording medium, wherein said disc recording medium is installed on the CD platform selectively; Being centered close on the straight line of first object lens, this straight line are passed the center of described second object lens and are extended along described tangent direction.
In above-mentioned optical disc apparatus, the end that light picker is shifted to the stroke of CD platform is made as at a distance of Spindle Motor position farthest.Optical disc apparatus can be designed so that easily that movable substrate and Spindle Motor keep not contacting each other.Therefore optical disc apparatus can be easy to design and can reduce the cost manufacturing.
Light picker can minimize to the distance that the CD platform moves, and makes moving effectively of light picker thus.
First optical path and second optical path are combined each other before objective lens actuator, and separated from one another before first object lens and second object lens.Therefore, utilize low profile and have narrow objective lens actuator can construct low profile and can with the light picker of multi-wavelength's compatibility, described limited range is for introducing the scope of laser beam.So light picker and optical disc apparatus can and be low profile with multi-wavelength's compatibility.
By example and description taken together with the accompanying drawings, above and other objects of the present invention, feature and advantage will be clearer from hereinafter, this accompanying drawing illustration the preferred embodiments of the present invention.
Description of drawings
Fig. 1 is the perspective schematic view of the optical disc apparatus of one embodiment of the invention;
Fig. 2 is the amplification view of the objective lens actuator of optical disc apparatus;
Fig. 3 is the amplification view of part objective lens actuator;
Fig. 4 is the partial plan of the position relation between the recording track that shows on two object lens and the disc recording medium;
Fig. 5 is the partial plan of the amplification of position shown in Figure 4 relation;
Fig. 6 is the partial plan with objective lens actuator of two object lens that are in diverse location;
Fig. 7 is the partial plan of the problem of the light picker of showing over;
Fig. 8 A and 8B show the configuration of light picker of the present invention.
Embodiment
The optimal mode of light picker of the present invention and optical disc apparatus is described hereinafter with reference to accompanying drawing.
As shown in Figure 1, optical disc apparatus 1 of the present invention has the shell 2 that holds various elements and mechanism.Shell 2 has the CD slot (not shown) that is limited on its sidewall.
The chassis (not shown) is positioned on the shell 2, and CD platform 3 is fixed on the motor drive shaft of Spindle Motor, and this Spindle Motor is installed on the chassis.
Two parallel guide shafts 4 are installed on the chassis.Can be supported on the chassis by the screw mandrel 5 that feeding motor (not shown) rotates.
The nut (not shown) that is installed in the movable substrate 7 is screwed on the screw mandrel 5.When screw mandrel 5 rotates around its own axle by the feeding motor, nut on screw mandrel 5 sense of rotation along these screw mandrel 5 settings, thereby make light picker 6 radially traversing at disc recording medium 100, this recording medium is installed on the CD platform 3.
The inner most recording track of second write area is the location according to the type of disc recording medium 100 and differently.As everyone knows, the inner most recording track of second write area of DVD100a or CD100b is apart from the about 22mm of this cd centre, the about 21mm of this cd centre of inner most track distances of second write area of BD100c.
When optical disc apparatus 1 with information signal recording on disc recording medium 100 or from disc recording medium 100 Copy Info signals, light picker 6 at first reading and recording writes information first area or the reading and recording information at first write area then in the information of second write area.So, when optical disc apparatus 1 with information signal recording on DVD100a or the CD100b or from DVD100a or CD100b Copy Info signal the time, light picker 6 at first reads information from the recording track apart from the about 22mm of this cd centre, and when optical disc apparatus 1 with information signal recording on the BD100c or from BD100c Copy Info signal the time, light picker 6 at first reads information from the recording track apart from the about 21mm of this cd centre.
Shown in Fig. 2 and 3, the movable piece 11 that objective lens actuator 8 has base part 9, fixture 10 and can move with respect to fixture.
Base part 9 is made by magnetic material, and comprises the substrate 9a that is installed on regularly in the movable substrate 7 and grip 9b from a pair of magnetic that substrate 9a is bent upwards 90 degree.It vertically, also is that the tangent direction (TAN) of the recording track of disc recording medium 100 is gone up apart at objective lens actuator 8 that magnetic is gripped 9b.
Magnet 12 is installed in magnetic respectively and grips on the surfaces opposite to each other of 9b.
The rear end of support spring 13 links to each other with fixture 10, and is connected with the circuit board that is connected to fixture 10 back sides.Support spring is outstanding forward from fixture 10.
The coil brace 14b that movable support 14 has lens carrier 14a and is arranged on lens carrier 14a back, this lens carrier 14a and the mutual one of coil brace 14b.
Lens carrier 14a have movable support 14 vertically on two the through hole 14c, the 14d (see figure 3) that are separated from each other.First object lens 16 and second object lens 17 are respectively on the lens carrier 14a above through hole 14c, the 14d.
On the tangent direction of the recording track of disc recording medium 100, first object lens 16 and second object lens 17 are separated by.The center S1 of first object lens 16 is positioned on the straight line Lt, and this straight line Lt passes the center S2 of second object lens 17 and extends along tangent direction.
So, as shown in Figure 5, from the distance H 1 of the center S1 of center P to the first object lens 16 of disc recording medium 16 greater than distance H 2 from the center S2 of center P to the second object lens 17 of disc recording medium 100.
Shown in Fig. 2 and 3, the coil brace 14b of movable piece 11 is the frame form of approximate vertical.Drive coil 15 is fixed on the coil brace 14b.
Drive coil 15 comprises makes movable piece 11 at the focusing coil 18 that moves on the focus direction with make movable piece 11 seek a pair of magnetic track coil 19 that moves on the rail direction.Focus direction is towards disc recording medium 100 and away from the direction of disc recording medium 100, also is direction or the vertical direction that arrow F represents among Fig. 3.Seek the rail direction and be disc recording medium 100 radially, also be the direction that arrow T represents among Fig. 2 or cross objective lens actuator 8 laterally.
In focusing coil 18 and the magnetic track coil 19 each comprises the winding that is roughly rectangular tubular.It vertically also is the winding axle that focus direction is extended that focusing coil 18 has, and it vertically, also is the winding axle that tangent direction extends along objective lens actuator 8 that magnetic track coil 19 has separately.Magnetic track coil 19 is installed in the front of focusing coil 18 and they are crossing the transversely apart of objective lens actuator 8.
Focusing coil 18 links to each other with connection terminal 14e with magnetic track coil 19 end separately, and this connection terminal 14e is installed on the opposite flank of movable support 14.Support spring 13 front end separately links to each other with connection terminal 14e respectively.Therefore, movable piece 11 links to each other with fixture 10 by support spring 13, and therefore is suspended in the air.
By drive current being provided for support spring 13 from power circuit, so that carry out focus adjustment or magnetic track adjusting with the circuit board that fixture 10 links to each other later.So this is used as support spring 13 and supplies with device, so that electric current is offered focusing coil 18 and magnetic track coil 19.
Being installed in the magnet 12 that magnetic separately grips on the 9b is arranged on the anterior locations and back location of every side magnetic track coil 19.
When by circuit board and support spring 13 when power circuit provides drive current for focusing coil 18 or magnetic track coil 19, movable piece 11 is gripped flow direction that 9b produces according to the direction of drive current and magnet 12 and magnetic and along focus direction or seek the rail direction and move.
When movable piece 11 along focus direction or seek the rail direction when moving, elastic deformations take place in support spring 13.
As shown in Figure 3, beam splitter 20 and all be arranged on the below of first object lens 16 and second object lens 17 respectively to upper reflector 21, these first object lens 16 and second object lens 17 are installed on the movable support 14.Beam splitter 20 and have interphase 20a and reflecting surface 21a respectively to upper reflector 21, this two sides is towards equidirectional.Beam splitter 20 and be installed in the movable substrate 7 to upper reflector 21.The interphase 20a of beam splitter 20 comprises the transmission film that relies on wavelength, the transmissivity of this transmission film along with pass in this light wavelength and change.
So optical disc apparatus 1 operation of structure is as follows:
When Spindle Motor rotary CD platform 3, the disc recording medium 100 that is installed on the CD platform 3 is rotated.
If disc recording medium 100 is DVD100a or CD100b, reflected by the decomposition face 20a of beam splitter 20 from light emitting devices (not shown) laser beam emission and that be applied to beam splitter 20 so, and be applied on the record surface of DVD100a or CD100b via first object lens 16.Therefore the laser beam that is applied on the record surface of DVD100a or CD100b is reflected, and as the Returning beam from first object lens 16 and beam splitter 20 to the light detection device (not shown).When Returning beam was applied to light detection device, light detection device was surveyed the signal comprise the RF signal, and with information signal recording on DVD100a or CD100b or from DVD100a or CD100b Copy Info signal.
If disc recording medium 100 is BD100c, pass the interphase 20a of beam splitter 20 so from light emitting devices (not shown) emitted laser bundle, reflect by reflecting surface 21a, and be applied on the record surface of BD100c via second object lens 17 to upper reflector 21.Therefore the laser beam that is applied on the record surface of BD100c is reflected, and as from second object lens 17, to upper reflector 21, and beam splitter 20 to the Returning beam of light detection device.When Returning beam was applied to light detection device, light detection device was surveyed the signal comprise the RF signal, and with information signal recording on BD100c or from BD100c Copy Info signal.
Simultaneously in record or copy step above, when drive current is offered focusing coil 18, the movable piece 11 of objective lens actuator 8 moves to carry out focus adjustment along focus direction with respect to fixture 10, thereby with the bundle point focusing of laser beam, this laser beam is to be applied on the recording track of disc recording medium 100 from the light emitting devices emission and via first object lens 16 or second object lens 17.
When drive current is offered magnetic track coil 19, the movable piece 11 of objective lens actuator 8 moves to carry out the magnetic track adjusting along seeking the rail direction with respect to fixture 10, thereby with the bundle point focusing of laser beam, thereby this laser beam is to be employed the recording track of following the trail of on the disc recording medium 100 from the light emitting devices emission and via first object lens 16 or second object lens 17.
In record or copy step above, light picker 6 radially outward moves towards the radially outer zone continuously from the inner radial zone of disc recording medium 100 simultaneously.If disc recording medium 100 is DVD100a or CD100b, light picker 6 at first reads the information that is write down from the recording track Tdc (see figure 4) of the about 22mm of distance cd centre via first object lens 16 so.If disc recording medium 100 is BD100c, light picker 6 at first reads the information that is write down from the recording track Tb (see figure 4) of the about 21mm of distance cd centre via second object lens 17 so.
The center S2 that is used to play second object lens 17 of BD100c is positioned at straight line Lr, and this straight line Lr is along the center P of radially extending and passing disc recording medium 100 of disc recording medium 100.The center S1 that is used for first object lens 16 of DVD playing back 100a or CD100b is positioned at straight line Lt, and this straight line Lt passes the center S2 of second object lens 17 and extends along the tangent direction of the recording track of disc recording medium 100.
When the inner most recording track Tb positioned in alignment of the center S2 of second object lens 17 and BD100c, the center S1 of first object lens 16 radially outward locatees from recording track Tb.If at this moment the position of light picker 6 is located at its end of radially shifting to the movement travel of CD platform 3, light picker 6 can read the information on the inner most recording track Tdc that is recorded in DVD100a or CD100b so.
On the contrary, if the object lens on the straight line Lr are used for DVD playing back 100a or CD100b, and other object lens are used to play BD100c, if and the center of the object lens on the straight line Lr is located at the end that it radially shifts to the movement travel of CD platform 3, align with the penetralia recording track Tdc of DVD100a or CD100b in the center of wherein said object lens, because radially outward locate at the end of the trip penetralia recording track Tb from BD100c at the center of other object lens, light picker 6 just can not read the information that is write down on the penetralia recording track Tb of BD100c so.Therefore, the radially inner center of other object lens must be located at the end that light picker 6 is radially shifted to the movement travel of CD platform 3.Therefore, light picker 6 must move big distance, and the object lens on the straight line Lr needn't move.
As mentioned above, be used for first object lens 16 of DVD playing back 100a and CD100b and be used to play second object lens 17 of BD100c apart on the tangent direction of the recording track of disc recording medium 100, the center S2 of second object lens 17 is positioned on the straight line Lr, and this straight line Lr passes the center P of disc recording medium 100 and along the radially extension of disc recording medium 100.Thereby the end that light picker 6 is radially shifted to the movement travel of CD platform 3 can be located at from Spindle Motor position farthest.Like this, light picker 6 can be designed so that movable substrate 7 does not contact mutually with Spindle Motor, and optical disc apparatus 1 can be easy to design and can be reduced to local the manufacturing.
The distance that light picker 6 moves towards CD platform 3 can be minimum, makes moving effectively of light picker 6 thus.
If light picker 6 is surveyed the recording track error signal according to different push-pull method, three laser beam spots on the record surface and the position between its recording track relation should preferably remain unchanged so.But, because when light picker 6 was shifted to the inner radial of disc recording medium 100 and perimeter, recording track had different curvature, the position relationship between three laser beam spots and the recording track.The rate of change of the position relation of employing when laser beam that first object lens 16 provide is greater than the rate of change that adopts the position relation when the laser beam that second object lens 17 provide, wherein the center S1 of first object lens 16 is positioned on the straight line Lr, this straight line Lr passes the center P of disc recording medium 100 and along the radially extension of disc recording medium 100, and the center S2 of second object lens 17 is positioned on the straight line Lr.
If disc recording medium 100 has less magnetic track-track distances, also is less track pitch that so above-mentioned position concerns more susceptible to.Therefore, has the BD100c of less track pitch than having than the DVD100a of track pitch and the influence that CD100b is more vulnerable to above-mentioned position relation greatly.
According to the present invention, be positioned at straight line Lr because be used to play the center S2 of second object lens 17 of BD100c, so increased the degree of accuracy that detects the magnetic track error signal according to different push-pull method.
If adopt three beams point method, light picker 6 skews are less so, and described skew is upward to cause between the inner radial of BD100c and perimeter by the center S2 of second object lens 17 of playing BD100c being positioned straight line Lr.
As everyone knows, single bundle point method is to utilize the three beams point in single bundle point (light beam) rather than the three beams point method to survey the magnetic track error signal.Yet single bundle point method is easy to be subjected to the flaw on the record surface of disc recording medium 100 and the influence of grit.Three beams point method seldom can be subjected to the flaw on the record surface of disc recording medium 100 and this influence of grit.
In the above-described embodiment, first object lens 16 that are used for DVD playing back 100a and CD100b are positioned on the movable piece 11 and near the far-end of this movable piece 11, second object lens 17 that are used to play BD100c are positioned on the movable piece 11 and these more close movable piece 11 near-ends, also promptly near fixture 10.On the contrary, as shown in Figure 6, second object lens 17 that are used to play BD100C can be positioned on the movable piece 11 and near the far-end of this movable piece 11, first object lens 16 that are used for DVD playing back 100a and CD100b be positioned at movable piece 11 and near the near-end of this movable piece 11, also promptly near fixture 10.
As for first object lens 16 and second object lens 17, be adopt the object lens layout shown in Fig. 4 or should adopt object lens layout shown in Figure 6, determine by the easiness that forms of the transmission film of the interphase 20a of beam splitter 20.For example, be about the laser beam of 660nm and 780nm respectively and be used for the transmission film that emission wavelength is about the laser beam of 405nm and can easily form interphase 20a if be used for reflection wavelength, first object lens 16 and second object lens 17 can be by the far-end successive position fixes of specified order from movable piece 11 so.On the contrary, be about the laser beam of 405nm and be used for the transmission film that emission wavelength is about the laser beam of 660nm and 780nm respectively and can easily form interphase 20a if be used for reflection wavelength, second object lens 17 and first object lens 16 can be by the far-end successive position fixes of specified order from movable piece 11 so.
In the above-described embodiment, described in order to play three types disc recording medium 100, also to be DVD100a, the optical disc apparatus 1 of CD100b and BD100c.Yet, principle of the present invention also can be applicable in order to play two types disc recording medium 100, also to be the optical disc apparatus of DVD100a and BD100c, perhaps in order to play two types disc recording medium 100, also to be the optical disc apparatus of CD100b and BD100c.
In the above-described embodiment, focus direction is described as vertical direction, seeks the rail direction and is described as laterally.Yet therefore these focusing and to seek the rail direction only be to come illustratively by example should not be defined as it vertical direction and laterally separately.
Fig. 8 A shows three-wavelength light picker 110, and this light picker has the various optical elements in substrate of being installed in 111.Light picker 110 have be used to record the information in CD and DVD goes up and from the CD/DVD optical system 120 of CD and DVD Copy Info, be used to record the information in that BD goes up and from the BD optical system 140 of BD Copy Info and be used for optical system shared 160 of CD, DVD and BD jointly.
In CD/DVD optical system 120, put on collimation lens 126 by coupled lens 122, catoptron 123, grating 124 and beam splitter 125 in succession from CD/DVD laser diode 121 emitted laser Shu Zuowei CD/DVD output beams as first laser beam sources.Collimation lens 126 changes the CD/DVD output beam into parallel beam, and this parallel beam is offered optical system shared 160.
Optical system shared 160 have the beam splitter 161 of combinatorial path, and this beam splitter reflexes to the photodiode 127 of front with portion C D/DVD output beam with the right angle, and this photodiode 127 is surveyed its laser powers.As hereinafter describing in detail, remaining CD/DVD output beam puts on the record surface (seeing Fig. 8 B) of CD 100 via CD/DVD object lens 162 from the beam splitter 161 of combinatorial path.Pass CD/DVD object lens 162 and return CD/DVD optical system 120 as the CD/DVD input beam from CD 100 beam reflected.
In CD/DVD optical system 120, the CD/DVD input beam is applied to beam splitter 125 via collimation lens 126.Beam splitter 125 is with right angle reflection CD/DVD input beam.The CD/DVD input beam that is reflected puts on PDIC (photodetector IC) 130 via cylindrical lens 128 and holographic Figure 129.PDIC 130 changes the CD/DVD input beam into electric signal, and output comprises the various signals of reproducing signals, magnetic track error signal and focus error signal.
In BD optical system 140, from as the BD laser diode 141 emitted laser Shu Zuowei BD output beams of second laser beam sources and put on polariscope 142, this polariscope comprises wavelength plate, grating or their combination.Polariscope 142 puts on beam splitter 143 with the BD output beam then with the plane of polarization rotation of BD output beam.
In optical system shared 160, the beam splitter 161 of combinatorial path is with reflecting part, right angle BD output beam.The BD output beam that is reflected puts on the record surface of CD 100 via BD object lens 163.Pass BD object lens 163 from CD 100 beam reflected as the BD input beam and be back to BD optical system 140.
In BD optical system 140, the BD input beam is via collimation lens 148 and catoptron 147 and be provided for beam splitter 146.Beam splitter 146 makes this BD input beam pass from it.Then, the BD input beam puts on PDIC 151 via holographic Figure 149 and coupled lens 150.PDIC 151 changes this BD input beam into electric signal, and output comprises the various signals of reproducing signals, magnetic track error signal and focus error signal.
Optical system shared 160 details of the present invention below will be described.In optical system shared 160, CD/DVD object lens 162 and BD object lens 163 all are installed on the shared two-axis adjuster 168.The mirror assembly 165 that comprises catoptron 166 that upwards reflects the CD/DVD light beam and the catoptron 167 that upwards reflects the BD light beam is arranged on CD/DVD object lens 162 and BD object lens 163 belows.
Shown in Fig. 8 B, the catoptron 166 that upwards reflects the CD/DVD light beam is arranged on CD/DVD object lens 162 belows, and the catoptron 167 that upwards reflects the BD light beam is arranged on BD object lens 163 belows.The beam splitter 161 of combinatorial path, the catoptron 166 that upwards reflects the catoptron 167 of BD light beam and upwards reflect the CD/DVD light beam are provided with as the crow flies.
As mentioned above, CD/DVD output beam and BD output beam all are provided for the beam splitter 161 of combinatorial path, and this beam splitter is used as optical system shared 160 optical path combiner.Passed the CD/DVD output beam of beam splitter 161 of combinatorial path and BD output beam and offered the catoptron that upwards reflects the BD light beam 167 as the optical path separation vessel via liquid crystal apparatus 164, this liquid crystal apparatus 164 is in order to correcting spherical aberration.
The catoptron 167 that upwards reflects the BD light beam comprises the beam splitter of selecting wavelength, be used for the right angle only reflection wavelength be indigo plant-purple laser beam of 405nm.If offering the laser beam of the catoptron 167 that upwards reflects the BD light beam is the BD output beam, the transmitting mirror 167 that so upwards reflects the BD light beam upwards reflects the BD output beam, and the BD output beam that is reflected is provided for CD 100, also is BD via BD object lens 163.Pass BD object lens 163 from the BD beam reflected, be provided for BD optical system 140 then via the beam splitter 161 of liquid crystal apparatus 164 and combinatorial path.
If offering the laser beam of the catoptron 167 that upwards reflects the BD light beam is the CD/DVD output beam, this catoptron 167 that upwards reflects the BD light beam passes to the CD/DVD output beam catoptron 166 that upwards reflects the CD/DVD light beam so.The catoptron 166 that upwards reflects the CD/DVD light beam upwards reflects the CD/DVD output beam, and the CD/DVD output beam that is reflected is provided for CD 100, also is CD or DVD via CD/DVD object lens 162.Pass CD/DVD object lens 162 from CD or DVD beam reflected, and be provided for CD/DVD optical system 120 via the beam splitter 161 of the catoptron 167 that upwards reflects the BD light beam, liquid crystal apparatus 164 and combinatorial path.
CD/DVD object lens 162 and BD object lens 163 all are installed on the shared two-axis adjuster 168.Offer upwards mirror assembly 165 from the CD/DVD output beam of CD/DVD optical system 120 emission with from the BD output beam of BD optical system 140 emissions via optical system shared 160 combinatorial path beam splitter 161.Upwards reflect the catoptron 167 of BD light beam, include the beam splitter of selecting wavelength, CD/DVD output beam and BD output beam are separated from each other, and CD/DVD output beam and BD output beam offer CD 100 via corresponding object lens 162,163 respectively.
The CD/DVD output beam of mirror assembly 165 and the part optical path of BD output beam combine each other by the beam splitter 161 of combinatorial path owing to offer upwards, and the two-axis adjuster 168 of holding object lens 162,163 has the shared optical path that is used for CD/DVD output beam and BD output beam.Correspondingly, the two-axis adjuster 168 that has limited range and have a low profile can combine with three-wavelength light picker 110, and wherein this limited range is the scope that laser beam can be applied to this.
As mentioned above, the part optical path of CD/DVD output beam and BD output beam combines each other by the beam splitter 161 of combinatorial path, and upwards mirror assembly 165 separates the CD/DVD output beam and they are offered corresponding object lens 162,163 respectively with the BD output beam.So the two-axis adjuster 168 that has limited range and have a low profile can combine with three-wavelength light picker 110, thereby make three-wavelength light picker 110 be low profile, wherein this limited range is the scope that laser beam can be applied to this.As a result, can be rendered as low profile with the CD drive 1 of multi-wavelength's compatibility.
In the above-described embodiment, two kinds of optical paths of CD/DVD output beam and BD output beam combine each other by the beam splitter 161 of combinatorial path.Yet the optical path of CD, DVD and BD output beam can provide independently of one another, and can combine by the beam splitter 161 of combinatorial path, and then is introduced into upwards mirror assembly 165.Can be not limited to CD, DVD and BD by the CD that CD drive 1 is play, but can comprise various other CDs.
In optical system shared 160 shown in Fig. 8 B, CD/DVD object lens 162 and BD object lens 163 can change the position, the catoptron 166 that wherein upwards reflects the CD/DVD light beam is positioned at the below of CD/DVD object lens 162, and the catoptron 167 that upwards reflects the BD light beam is positioned at the below of BD object lens 163.In this modification, the beam splitter 161 of combinatorial path, the catoptron 166 that upwards reflects the catoptron 167 of BD light beam and upwards reflect the CD/DVD light beam can be arranged as the crow flies.
Especially, CD/DVD object lens and BD object lens are provided with shown in Fig. 3 and 4, thereby the CD/DVD output beam of the separation vessel 161 that passes the combinatorial path light beam and BD output beam are offered the catoptron that upwards reflects the CD/DVD light beam 166 as the optical path separation vessel.
According to described modification, the catoptron 166 that upwards reflects the CD/DVD light beam comprises the beam splitter of selecting wavelength, so that transmit indigo plant-purple laser beam that wavelength is about 405nm.If offering the laser beam of the catoptron 166 that upwards reflects the CD/DVD light beam is the BD laser beam, the catoptron 166 that so upwards reflects the CD/DVD light beam passes to the BD output beam catoptron 167 that upwards reflects the BD light beam.The catoptron 167 that upwards reflects the BD light beam is the upwards reflection of this BD output beam, and the BD output beam that is reflected then is provided for CD 100, also is BD via BD object lens 163.Pass BD object lens 163 from the BD beam reflected, and pass the beam splitter 161 of the catoptron 167, liquid crystal apparatus 164 and the combinatorial path that upwards reflect the BD light beam and offer BD optical system 140.
If offering the laser beam of the catoptron 166 that upwards reflects the CD/DVD light beam is the CD/DVD output beam, the catoptron 166 that so upwards reflects the CD/DVD light beam reflects this CD/DVD output beam with the right angle.The CD/DVD output beam that is reflected is provided for CD 100, also is CD or DVD via CD/DVD object lens 162.From CD or DVD beam reflected pass CD/DVD object lens 162, the beam splitter 161 that via the catoptron 166 that upwards reflects the CD/DVD light beam, upwards reflects catoptron 167, liquid crystal apparatus 164 and the combinatorial path of BD light beam then is provided for CD/DVD optics provides 120.
Though illustrated and described in detail some preferred embodiment of the present invention, it should be understood that under the situation of the scope of attaching claim, can carry out various variations and modification.
Claims (6)
1. light picker is used for that at least two kinds of laser beam of wavelength are applied to one of at least two kinds of dissimilar disc recording mediums selectively with having separately, and this disc recording medium is installed on the CD platform selectively, and described light picker comprises:
Can radially move past the movable substrate of disc recording medium, this disc recording medium is installed on the CD platform selectively; And
Be installed in described movable suprabasil objective lens actuator;
Described objective lens actuator comprises:
Be fixedly mounted on described movable suprabasil fixture;
Can and seek the movable piece that the rail direction moves along focus direction with respect to described fixture, towards moving with record surface away from disc recording medium, the described rail direction of seeking is essentially disc recording medium radially to this movable piece along focus direction;
Be installed in first object lens on the described movable piece, be used for first laser beam is focused on wherein a kind of record surface of disc recording medium; With
Be installed in second object lens on the described movable piece, be used for second laser beam is focused on the record surface of another kind of disc recording medium, the wavelength of this second laser beam is shorter than described first laser beam, and the type of described another kind of disc recording medium is different with described one of them disc recording medium;
Described first object lens and second object lens are apart on the tangent direction of the recording track of disc recording medium, and this tangent direction is perpendicular to described focus direction and the described rail direction of seeking;
Described first or being centered close on the straight line of second object lens, this straight line passes the center of disc recording medium and along the radially extension of disc recording medium, wherein said disc recording medium is installed on the CD platform selectively;
Being centered close on the straight line of described first object lens, this straight line are passed the center of described second object lens and are extended along described tangent direction.
2. according to the described light picker of claim 1, also comprise:
Be used to launch first laser beam sources of described first laser beam;
Be used to launch second laser beam sources of described second laser beam;
First optical path is used for described first laser beam from described first laser beam sources is guided to described first object lens;
Second optical path is used for described second laser beam from described second laser beam sources is guided to described second object lens;
The optical path combiner is used for described first optical path of built-up section and described second optical path; And
The optical path separation vessel is used in the front of described first object lens and described second object lens described first optical path of part by described optical path combiner combination being separated with described second optical path.
3. according to the described light picker of claim 2, it is characterized in that described optical path combiner is described first optical path of built-up section and described second optical path before described first laser beam and described second laser beam are introduced into described objective lens actuator.
4. according to the described light picker of claim 2, it is characterized in that, described optical path separation vessel is a Wavelength-selective, it is separated from each other described first laser beam and described second laser beam by the wavelength according to first laser beam and second laser beam, thereby described first optical path of part that described optical path combiner is made up is separated with described second optical path.
5. an optical disc apparatus is used for playing at least two kinds of dissimilar disc recording mediums selectively, and this device comprises:
The CD platform is used for selectively that disc recording medium is mounted thereto;
Light picker is used for that at least two kinds of laser beam of wavelength are applied to one of disc recording medium selectively with having separately, and this disc recording medium is installed on the described CD platform selectively;
Described light picker comprises:
Can radially move past the movable substrate of disc recording medium, this disc recording medium is installed on the CD platform selectively;
Be installed in described movable suprabasil objective lens actuator;
Described objective lens actuator comprises:
Be fixedly mounted on described movable suprabasil fixture;
Can and seek the movable piece that the rail direction moves along focus direction with respect to described fixture, towards moving with record surface away from disc recording medium, the described rail direction of seeking is essentially disc recording medium radially to this movable piece along focus direction;
Be installed in first object lens on the described movable piece, be used for first laser beam is focused on wherein a kind of record surface of disc recording medium; With
Be installed in second object lens on the described movable piece, be used for second laser beam is focused on the record surface of another kind of disc recording medium, the wavelength of this second laser beam is shorter than described first laser beam, and the type of described another kind of disc recording medium is different with described wherein a kind of disc recording medium;
Described first object lens and second object lens are apart on the tangent direction of the recording track of disc recording medium, and this tangent direction is perpendicular to described focus direction and the described rail direction of seeking;
Described first or being centered close on the straight line of second object lens, this straight line passes the center of disc recording medium and along the radially extension of disc recording medium, wherein said disc recording medium is installed on the CD platform selectively;
Being centered close on the straight line of described first object lens, this straight line are passed the center of described second object lens and are extended along described tangent direction.
6. according to the described optical disc apparatus of claim 5, it is characterized in that described light picker also comprises:
Be used to launch first laser beam sources of described first laser beam;
Be used to launch second laser beam sources of described second laser beam;
First optical path is used for described first laser beam from described first laser beam sources is guided to described first object lens;
Second optical path is used for described second laser beam from described second laser beam sources is guided to described second object lens;
The optical path combiner is used for described first optical path of built-up section and described second optical path; And
The optical path separation vessel is used in the front of described first object lens and described second object lens described first optical path of part by described optical path combiner combination being separated with described second optical path.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004265381 | 2004-09-13 | ||
| JP2004265381 | 2004-09-13 | ||
| JP2004322338 | 2004-11-05 |
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| CN1767014A true CN1767014A (en) | 2006-05-03 |
| CN100394482C CN100394482C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100999365A Expired - Fee Related CN100394482C (en) | 2004-09-13 | 2005-09-13 | Optical pickup and disc drive apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101154400B (en) * | 2006-09-26 | 2010-08-11 | 船井电机株式会社 | Objective lens actuator and optical pickup device having the same |
| US7848210B2 (en) | 2006-12-27 | 2010-12-07 | Kabushiki Kaisha Toshiba | Optical head and optical disk apparatus |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG72954A1 (en) * | 1998-05-21 | 2000-05-23 | Samsung Electronics Co Ltd | Optical pickup |
| DE60025892T2 (en) * | 1999-09-21 | 2006-08-10 | Matsushita Electric Industrial Co., Ltd., Kadoma | Optical scanning device with improved optical properties, and manufacturing method of the optical scanning device |
| JP2003168228A (en) * | 2001-11-29 | 2003-06-13 | Nec Corp | Actuator for objective lens of optical pickup |
| JP2003296965A (en) * | 2002-04-03 | 2003-10-17 | Matsushita Electric Ind Co Ltd | Method for manufacturing optical pickup |
| KR100505644B1 (en) * | 2002-10-16 | 2005-08-03 | 삼성전자주식회사 | Optical pick-up actuator and apparatus for recording and/or reproducing data |
| KR20040037893A (en) * | 2002-10-30 | 2004-05-08 | 삼성전자주식회사 | Actuator for optical pickup, optical pickup apparatus and optical recording/ reproducing apparatus adopting the same |
-
2005
- 2005-09-13 CN CNB2005100999365A patent/CN100394482C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101154400B (en) * | 2006-09-26 | 2010-08-11 | 船井电机株式会社 | Objective lens actuator and optical pickup device having the same |
| US7848210B2 (en) | 2006-12-27 | 2010-12-07 | Kabushiki Kaisha Toshiba | Optical head and optical disk apparatus |
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| CN100394482C (en) | 2008-06-11 |
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