CN101647067B - Method for manufacturing optical pickup device, and optical pickup device - Google Patents
Method for manufacturing optical pickup device, and optical pickup device Download PDFInfo
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- CN101647067B CN101647067B CN200880008678.7A CN200880008678A CN101647067B CN 101647067 B CN101647067 B CN 101647067B CN 200880008678 A CN200880008678 A CN 200880008678A CN 101647067 B CN101647067 B CN 101647067B
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
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- Optics & Photonics (AREA)
- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Provided is a method for manufacturing an optical pickup device, which has an aberration correcting means that performs highly accurate and high-speed aberration correction and suitably records and/or reproduces information. Such optical pickup device is also provided. A reference table (B) of a drive unit (CU) is provided with reference surfaces (P1, P2) parallel to guide shafts (GS, DS) which guide an optical element holder (LHD2) in an optical axis direction. The reference table arranges the optical element (L3) on the optical element holder (LHD2) so that a center mark (CM) put on the optical surface of the optical element (L3) is in aprescribed relationship with the reference surfaces (P1, P2) of the reference table (B). The reference surfaces (P1, P2) of the reference table (B) of the drive unit (CU) whereupon the optical element (L3) is arranged are fixed by having them abut to the reference surface of the optical pickup device. Thus, the optical axis of the light source and the optical axis of the optical element (L3) are easily accorded with each other.
Description
Technical field
The present invention relates to manufacture method and the optical take-up apparatus of optical take-up apparatus, relate in particular to manufacture method and the optical take-up apparatus that can carry out rightly to optical information recording medium the optical take-up apparatus of information recording/and/or regeneration.
Background technology
The research and development that in recent years, can utilize bluish violet semiconductor laser about wavelength 400nm to carry out the high density optical disc systems of information recording/and/or regeneration (following note " record and/or regeneration " be " recording/reproducing ") makes progress rapidly.For example for the CD that carries out information recording// regeneration with the specification of NA 0.65, optical source wavelength 405nm, be the per 1 layer of information that can record 15～20GB of CD of diameter 12cm among the so-called HD DVD (hereinafter referred to as HD).And for example for the CD that carries out information recording// regeneration with the specification of NA 0.85, optical source wavelength 405nm, be the per 1 layer of information that can record 15～25GB of CD of diameter 12cm among the so-called Blu-ray Disc (hereinafter referred to as BD).In this manual, claim this CD to be " high density compact disc ".
If consider the present situation of DVD, CD (mini disk) sale that the variety of information of recording is arranged now, then wish to carry out rightly information recording// regeneration to various types of CDs with a record regenerator as far as possible.And, be equipped in the laptop etc. if consider optical take-up apparatus, so not only need to have the interchangeability to multiple kinds of optical disc, importantly also must further advance miniaturization.
If the enough single object lens of energy are realized the Alternate of different discs in the optical take-up apparatus, then are preferred from realizing miniaturization.If but considered the specification of high density compact disc, then difficulty would be higher for the universalization of technical realization object lens, sometimes causes cost to rise.
BD in the high density compact disc; (" protective seam " refers to the hyaline layer that the optical disc information record surface in light beam incident is provided with to adopt the thinner protective seam of 0.1mm degree on it; also claim transparency carrier); this is in order to suppress because the coma aberration that object lens are produced by high-NA and in the CD perk with when tilting; but just because of this differing widely of protective layer thickness and CD and DVD, so not causing significant cost at least, the general object lens of requirement use between the CD of all size, do not obtain interchangeability with rising.When using any CD, from the CD drive unit of packing into, shorter to the stand-by period of state that can recording/reproducing, the performance glamour of drive unit product is larger.Therefore, wish that optical take-up apparatus also has exchange at a high speed and replys performance.
In addition, a kind of so-called 2 layers of record DVD are arranged for known, it is from the 2 layer laminate structures of same beam incident surface top-cross for protective seam, information recording layer, thus memory capacity is brought up to about 2 times.Especially in optical disk system of future generation, because use the object lens than the taller numerical aperture of DVD, if so want above-mentioned 2 layers of recording type optical disc are carried out recording/reproducing, when the information recording/interlayer focuses on jump, because the thickness from beam incident surface to each information recording layer is different, occur having larger spherical aberration.Therefore in the optical disk system of future generation, when the information recording/interlayer focuses on jump, must when carrying out object lens focusing, carry out the correction of spherical aberration.
Also have in addition a problem, that is: CD protecting layer thickness error causes that the spherical aberration of generation hinders appropriate record and/or regeneration.4 powers of this spherical aberration and numerical aperture of objective occur pro rata.During smaller CD in the past, the DVD of numerical aperture, so do not need special spherical aberration correction because the spherical aberration generating capacity that the protective layer thickness error causes is very little.And numerical aperture of objective is when becoming large; for example take numerical aperture as 0.85 o'clock; the permissible value of protective layer thickness error then strictly arrives number μ m degree, if consider the residual spherical aberration of optical take-up apparatus and the production of CD media, then is that the preferred light pick device possesses the spherical aberration correction function.When the spherical aberration that must cause with real-time processing correction CD protecting layer thickness error, require the higher responsiveness of spherical aberration correction means.
In addition, when the object lens that change varying with temperature with refractive index consist of object lens, because spherical aberration is corresponding to temperature variation and deteriorated, so also must revise.Can carry out interchangeably in the optical take-up apparatus of information recording// regeneration respectively different types of CD, require to solve above-mentioned these problems and realize small low-cost.
In order to address these problems, a kind of light-gathering optics that possesses optical beam expander is arranged by motion, this optical beam expander is comprised of positive lens and negative lens, and wherein at least one can move along optical axis.But the optical take-up apparatus great majority are configured in very in the narrow space, and the lens that what kind of driving means to drive the key element that consists of optical beam expander with in this optical take-up apparatus then become problem.A kind of structure of utilizing piezoelectric element to drive collimation lens at optical axis direction is disclosed in the patent documentation 1.
Patent documentation 1: JP 2005-302118 communique
Summary of the invention
The problem that the invention wish solves
Know now even in optical take-up apparatus, be assembled in the collimation lens that optical axis direction can drive, the situation that can not get the performance of hoping is arranged also.That is to say, no matter lens producer provides high-precision lens with many high-performance, also no matter gearing producer provides high-precision driver element with many high-performance, in optical take-up apparatus producer they are assembled into when going in the optical take-up apparatus, always the situation that the signal flase drop goes out that produces is arranged.
The present invention is in view of the problem points of above-mentioned conventional art, purpose is to provide a kind of manufacture method and optical take-up apparatus of optical take-up apparatus, wherein have can high-precision high-speed correction aberration the aberration correction means, can carry out rightly information recording/and/or regeneration.
With the means that solve problem
The manufacture method of the optical take-up apparatus of technical scheme 1 record, this optical take-up apparatus has: the optical element that possesses 2 optical surfaces; Support the optical element support of described optical element; At lead 2 axis of guides of described optical element support of optical axis direction; Drive the gearing of described optical element support at optical axis direction; Driver element with standard station of the described axis of guide of direct or indirect support and described gearing; The optical take-up apparatus manufacture method is characterised in that,
At least 1 described optical surface of described optical element has center mark,
Described standard station has the reference field parallel with the described axis of guide,
Comprise following operation:
On the described optical element support described optical element is being configured to: when described optical element support is moved along the described axis of guide, the relation of the center mark of being paid on the optical surface of described optical element and the described reference field Cheng Suoding of described standard station;
The reference field that makes the described reference field of the described standard station of the described driver element that has configured described optical element run into described optical take-up apparatus is fixed.
Optical take-up apparatus has driver element and the optical element that is installed in the driver element at least.Driver element has the optical element support of supporting optical component, drives the standard station of the gearing of optical element support, direct or indirect support guide axle and gearing at 2 axis of guides of optical axis direction guiding optics element bracket, at optical axis direction." directly or indirectly support " refers to: when standard station support guide axle and/or gearing, and the meaning that intermediary's miscellaneous part can intermediary's miscellaneous part yet.
The reference field that the reference field of the standard station by making driver element is run into optical take-up apparatus is fixed, and locates driver element in optical take-up apparatus.
The present inventor is by with keen determination research discovery, owing to inconsistent by the optical axis of the optical axis of the optical element of optical element stent support and optical take-up apparatus, so can not bring into play the optical characteristics of hoping.According to above-mentioned opinion, as countermeasure, consisted of the present invention.More particularly, by at least 1 optical surface subscript center mark at optical element, make the reference field Cheng Suoding of the standard station of center mark that the optical surface of optical element is marked with and driver element configure optical element at the optical element support to relation, the reference field that makes the reference field of the standard station of the driver element that has configured optical element run into optical take-up apparatus is fixed, like this, can be under the optical axis that the makes optical element state consistent with the optical axis of optical take-up apparatus, the driving of carrying out optical element can be stabilized in Locating driver unit simply in optical take-up apparatus.
The what is called here " the reference field Cheng Suoding relation of the center mark that the optical surface of optical element is marked with and the standard station of driver element " refers to: reference field and the center mark of the standard station of preferred driver element are institute's set a distances of making in advance in the distance of axis of guide vertical direction.This set a distance is the distance of making for the optical axis that makes optical element is consistent with the optical axis of the chief ray that penetrates from the optical take-up apparatus light source.On any one position, the reference field of the standard station of driver element and center mark all were constant institute's set a distances in the distance of the axis of guide vertical direction when optical element support was moved along the axis of guide.
The reference field of the standard station of driver element is the plane, and the reference field of optical take-up apparatus also is the plane.The reference field that makes the reference field of standard station run into optical take-up apparatus is fixed.Can make so the also institute's set a distance for making in advance of distance of the axis of guide vertical direction of the reference field of optical take-up apparatus and center mark.
Center mark is provided in a side of sign on the optical surface center (optical axis of optical element) of optical element, can enough visual identification.Center mark can not be located in the center of optical surface in the heart, and is certain but the distance of the optical axis of center mark and optical element must keep.The big or small degree of preferred center sign does not affect optical property, and can form with dyestuff and pigment, can form jog when moulding yet.
Optical element of the present invention is preferably coupled lens (comprising collimation lens), but also can be object lens.When optical element is coupled lens, so it is little preferred on the impact of optical property to establish center mark.Optical element can be 2 standard lens that optical surface all is plane of refraction, also can be to have the poor lens of paying structure of diffraction structure aplanatism at least on 1 optical surface, but from the viewpoint of the good identity of center mark, preferred standard lens.
As long as the optical element support can supporting optical component, material and shape are not had particular restriction, but from light-weighted viewpoint, the drum of preferred plastic raw materials is at the medial support optical element.
The manufacture method of the optical take-up apparatus of technical scheme 2 records, it is the invention of record in the technical scheme 1, it is characterized in that, the described reference field of described standard station comprises 1st face and 2nd face parallel and crossing with the described axis of guide, the distance of the distance of the axis of guide vertical direction of described the 1st face of described center mark distance and the axis of guide vertical direction of described the 2nd face of distance, location independent with described optical element support remains unchanged.
Like this can the limit suppress the driving that optical element is carried out on the limit of rocking of optical element optical axis.
The 1st face of the reference field of preferred reference platform is vertical with the 2nd face.In addition, the reference field of optical take-up apparatus also has crossing the 1st face and the 2nd face, and the 1st face of standard station and the 1st face of optical take-up apparatus are run into, and the 2nd face of the 2nd face of standard station and optical take-up apparatus run into.The 1st face of preferred light pick device, the 2nd angle that face intersects equate with the angle that intersects of the 1st face of standard station, the 2nd face.
The manufacture method of the optical take-up apparatus of technical scheme 3 records, it is the invention of record in technical scheme 1 or 2, it is characterized in that, described driver element has described gearing for the motor inverting element, being fixed on the driver part of described motor inverting element one end, linking with described optical element support and being supported for can be at the mobile movable member of described driver part, repeatedly flexible by making described motor inverting element change speed in flexible direction, described movable member is moved.
The gearing that uses among the present invention preferably adopts the motor inverting elements such as piezoelectric actuator, but also can be the motors such as voice coil motor.
The optical take-up apparatus of technical scheme 4 records has: the optical element that possesses 2 optical surfaces; Support the optical element support of described optical element; At lead 2 axis of guides of described optical element support of optical axis direction; Drive the gearing of described optical element support at optical axis direction; Driver element with standard station of the described axis of guide of direct or indirect support and described gearing; Optical take-up apparatus is characterised in that,
Paid center mark at least 1 described optical surface of described optical element,
Described standard station has the reference field parallel with the described axis of guide,
Be configured at described the above optical element of optical element support: when described optical element support is moved along the described axis of guide, the relation of the center mark of being paid on the optical surface of described optical element and the described reference field Cheng Suoding of described standard station,
The reference field that makes the described reference field of the described standard station of the described driver element that has configured described optical element run into described optical take-up apparatus is fixed wtih.
According to the present invention, by center mark at least 1 optical surface subscript of optical element, be configured at optical element on the optical element support: when the optical element support is moved along the axis of guide, the reference field Cheng Suoding relation of the center mark that the optical surface of optical element is marked with and the standard station of driver element, in addition, the reference field that makes the reference field of the standard station of the driver element that has configured optical element run into optical take-up apparatus is fixed, like this, can be under the optical axis that the makes optical element state consistent with the optical axis of optical take-up apparatus, Locating driver unit simply in optical take-up apparatus can carry out the driving of optical element unchangeably.
The optical take-up apparatus of technical scheme 5 records, it is the invention of record in the technical scheme 4, it is characterized in that, the described reference field of described standard station comprises 1st face and 2nd face parallel and crossing with the described axis of guide, the distance of the distance of the axis of guide vertical direction of described the 1st face of described center mark distance and the axis of guide vertical direction of described the 2nd face of distance remains unchanged with the location independent of described optical element support.
The optical take-up apparatus of technical scheme 6 records, it is the invention of record in technical scheme 4 or 5, it is characterized in that, described driver element has described gearing for the motor inverting element, being fixed on the driver part of described motor inverting element one end, linking with described optical element support and being supported for can be at the mobile movable member of described driver part, repeatedly flexible by making described motor inverting element change speed in flexible direction, described movable member is moved.
The effect of invention
According to the present invention, a kind of manufacture method and optical take-up apparatus of optical take-up apparatus can be provided, wherein have can high-precision high-speed correction aberration the aberration correction means, can carry out rightly information recording/and/or regeneration.
Description of drawings
Fig. 1: the structure approximate vertical view of the 1st embodiment optical take-up apparatus.
The figure that the structure of Fig. 2: Fig. 1 is seen in arrow II direction.
Fig. 3: the driver element CU stereographic map that drives collimating optical system COL.
Fig. 4: a plurality of piezoelectric ceramics PE of stack, the arranged side by side lamination-type piezoelectric actuator PZ schematic perspective view of the structure of connecting electrode C betwixt.
Fig. 5 (a), Fig. 5 (b): be applied to the voltage pulse waveforms schematic diagram on the piezoelectric actuator PZ.
Symbol description
ACT object lens gear train
The B base
The BS beam shaping element
The COL collimating optical system
The CPL coupled lens
The CU driver element
The D1 diffraction element
The D2 diffraction element
DBS dichroism optical splitter
DC drives the loop
The DS driving shaft
The GS axis of guide
LHD optical element support
LHD1 optical element support
LHD2 optical element support
The HL perforate
HWP λ/2 wave plates
The L lens
The L1 lens
The L2 lens
The L3 lens
The LD1 semiconductor laser
The LD2 semiconductor laser
The LD3 semiconductor laser
The LPM laser power monitor
The M reflective mirror
ML monitors lens
The OBJ object lens
The OD1 CD
The OD2 CD
The OD3 CD
The PBS polarizing beam splitter
The PD optical detector
The PE piezoelectric ceramics
The PS position sensing
The PZ piezoelectric actuator
QWP λ/4 wave plates
SL sensing lens
W1, W2 wall
Embodiment
With reference to accompanying drawing, embodiments of the present invention are described.Fig. 1 is the structure approximate vertical view that can carry out rightly to the different optical information recording medium BD of protective layer thickness or HD, DVD and CD the present embodiment optical take-up apparatus of information recording// regeneration.Fig. 2 is the outboard profile that present embodiment is seen from arrow II direction.In the present embodiment, light-gathering optics comprises object lens OBJ and collimating optical system COL.In the present embodiment, use in same plug-in unit, to have accommodated or to have fixed at same heat dump to be the 2nd semiconductor laser LD2 of the 2nd light source and to be what is called 2 laser 1 plug-in unit of the 3rd semiconductor laser LD3 of the 3rd light source, but also can the individual configuration semiconductor laser.In the present embodiment, collimation lens is equivalent to optical element of the present invention.
When the 1st CD OD1 (for example BD or HD) is carried out information recording/and/or regeneration, in the optical take-up apparatus of Fig. 1, the light beam that penetrates from the semiconductor laser LD1 (the 1st light source) of optical source wavelength 350～450nm is shaped at beam shaping element BS beam shape, and passing the 1st diffraction element D1 is separated into the main beam that record regenerating uses and follows the tracks of the side beam that error signal detects usefulness, then be reflected at dichroism optical splitter DBS, PBS is reflected at polarizing beam splitter, pass collimating optical system COL and be transformed into parallel beam, then incide on the reflective mirror M.The action of the collimating optical system COL of relevant divergence change means is narrated in the back.
Among Fig. 2, a part that incides the light beam of reflective mirror M monitors lens ML through passing behind the reflective mirror, incides laser power monitor LPM, is used to the supervision of laser power.And the remainder that incides the light beam of reflective mirror M is reflected at reflective mirror M; pass and incide object lens OBJ behind λ/4 wave plate QWP and (consisted of by 2 elements in the present embodiment; but 1 also can) on, then be concentrated on the information recording surface R1 (protective layer thickness 0.1mm or 0.6mm) of CD OD1.
Again pass object lens OBJ, λ/4 wave plate QWP in the folded light beam that information recording surface R1 has modulated light intensity through information track, M is reflected at reflective mirror, then pass collimating optical system COL, and pass polarizing beam splitter PBS, be concentrated on the sensitive surface of optical detector PD by sensing lens SL.Utilize the output signal of optical detector PD, can access the read signal of the information that information recording/on the CD OD1.
The light quantity that detects change of shape, the change in location of the spot on optical detector PD changes, and focuses on to detect and tracking detects.Detect according to this, the focusing gearing of object lens gear train ACT and tracking drive device are together with the mobile object lens OBJ of optical element support LHD, so that the light beam that the 1st semiconductor laser LD1 penetrates appropriate imaging on the information recording surface R1 of CD OD1.
When the 2nd CD OD2 (for example DVD) is carried out information recording/and/or regeneration, in the optical take-up apparatus of Fig. 1, after the light beam that penetrates from the semiconductor laser LD2 of optical source wavelength 600～700nm penetrates from 2 laser, 1 plug-in unit to the outside, passing the 2nd diffraction element D2 is separated into the main beam that record regenerating uses and follows the tracks of the side beam that error signal detects usefulness, in the adjusted angle of divergence of coupled lens CPL, pass λ/2 wave plate HWP, dichroism optical splitter DBS, PBS is reflected at polarizing beam splitter, pass collimating optical system COL and be transformed into parallel beam, then incide on the reflective mirror M.
Among Fig. 2, a part that incides the light beam of reflective mirror M monitors lens ML through passing behind the reflective mirror, incides laser power monitor LPM, is used to the supervision of laser power.And the remainder that incides the light beam of reflective mirror M is reflected at reflective mirror M, incides on the object lens OBJ after passing λ/4 wave plate QWP, then is concentrated on the information recording surface R2 (protective layer thickness 0.6mm) of CD OD2.
Again pass object lens OBJ, λ/4 wave plate QWP in the folded light beam that information recording surface R2 has modulated light intensity through information track, M is reflected at reflective mirror, then pass collimating optical system COL, and pass polarizing beam splitter PBS, be concentrated on the sensitive surface of optical detector PD by sensing lens SL.Utilize the output signal of optical detector PD, can access the read signal of the information that information recording/on the CD OD2.
The light quantity that detects change of shape, the change in location of the spot on optical detector PD changes, and focuses on to detect and tracking detects.Detect according to this, the focusing gearing of object lens gear train ACT and tracking drive device are together with the mobile object lens OBJ of optical element support LHD, so that the light beam that the 2nd semiconductor laser LD2 penetrates appropriate imaging on the information recording surface R2 of CD OD2.
When the 3rd CD OD3 (for example CD) is carried out information recording/and/or regeneration, in the optical take-up apparatus of Fig. 1, after the light beam that penetrates from the semiconductor laser LD3 of optical source wavelength 750～850nm penetrates from 2 laser, 1 plug-in unit to the outside, passing the 2nd diffraction element D2 is separated into the main beam that record regenerating uses and follows the tracks of the side beam that error signal detects usefulness, in the adjusted angle of divergence of coupled lens CPL, pass λ/2 wave plate HWP, dichroism optical splitter DBS, PBS is reflected at polarizing beam splitter, pass collimating optical system COL and be transformed into parallel beam, then incide on the reflective mirror M.
Among Fig. 2, a part that incides the light beam of reflective mirror M monitors lens ML through passing behind the reflective mirror, incides laser power monitor LPM, is used to the supervision of laser power.And the remainder that incides the light beam of reflective mirror M is reflected at reflective mirror M, incides on the object lens OBJ after passing λ/4 wave plate QWP, then is concentrated on the information recording surface R3 (protective layer thickness 1.2mm) of CD OD3.
Again pass object lens OBJ, λ/4 wave plate QWP in the folded light beam that information recording surface R3 has modulated light intensity through information track, M is reflected at reflective mirror, then pass collimating optical system COL, and pass polarizing beam splitter PBS, be concentrated on the sensitive surface of optical detector PD by sensing lens SL.Utilize the output signal of optical detector PD, can access the read signal of the information that information recording/on the CD OD3.
The light quantity that detects change of shape, the change in location of the spot on optical detector PD changes, and focuses on to detect and tracking detects.Detect according to this, the focusing gearing of object lens gear train ACT and tracking drive device are together with the mobile object lens OBJ of optical element support LHD, so that the light beam that the 3rd semiconductor laser LD3 penetrates appropriate imaging on the information recording surface R3 of CD OD3.
Fig. 3 is the driver element CU stereographic map that drives collimating optical system COL.Among Fig. 3, base (standard station) B has wall W1, the W2 that stretches out upward from two ends.Axis of guide GS extends, and links near the upper end of wall W1, W2 (cut open and illustrate).Formed respectively perforate HL on wall W1, the W2, light beam passes therein.
Lens L1, L2 support periphery by optical element support LHD1, and the perforate HL that covers wall W1 is stuck.Preferably when mounted lens L1, L2, adopt autocollimator, suppress displacement and the inclination of relative optical take-up apparatus optical axis (reference axis) as far as possible.
And be that the lens L3 of collimation lens supports periphery by optical element support LHD2 as optical element.The optical element support LHD2 of double movable member has the HDa of the section that is associated that is associated with axis of guide GS and the linking part HDb that is subjected to driving force again.Formed in the heart center mark CM in the optical surface of lens L3.
Linking part HDb is provided with the groove that the driving shaft DS with the axis of guide of holding concurrently again joins, and the above is equipped with laminated spring SG.For the driving shaft DS of driver part is configured between linking part HDb and the laminated spring SG, by the pushing of the thrust of laminated spring SG appropriateness.The wall W1 side of driving shaft DS is provided with the slit, and the other end connects wall W2 and is attached on the piezoelectric actuator PZ into the motor inverting element.Piezoelectric actuator PZ has fixed part Bh, waits by bonding in the outside of W2 to be fixed on the base B.
Configuring the external drive loop on the base B, apply voltage (not diagram) by distribution H, (position detects means to be used for detecting the illustrated scrambler that do not have of linking part HDb amount of movement from magnetic (or light), for example can configure magnetic information at axis of guide GS, the section HDa of being associated establish read first-class) receive signal, control drives piezoelectric actuator PZ.Piezoelectric actuator PZ, driving shaft DS, linking part HDb, laminated spring SG consist of driving means.Drive the loop and also can be configured on the base B, link by distribution.
To be lamination form with the piezoelectric ceramics of the formation such as PZT (zircon/lead titanates) piezoelectric actuator PZ.Piezoelectric ceramics has that the center of gravity of the center of gravity of the positive charge in the crystal lattice and negative charge is inconsistent and self polarization applies the characteristic that voltage can stretch in its polarised direction.But piezoelectric ceramics is small at the deflection of this direction, it is difficult utilizing this deflection to drive driven parts, so the as shown in Figure 4 a plurality of piezoelectric ceramics PE of stack and betwixt the lamination-type piezoelectric actuator PZ of the structure of connecting electrode C arranged side by side are provided as practical.In the present embodiment, use this lamination-type piezoelectric actuator PZ as drive source.
Subsequent, the driving method of the lens L3 of this optical system unit CU is explained.The addendum modification of lamination-type piezoelectric actuator PZ when voltage applies is little, but generation power is large, and responsiveness is sharp.Therefore, in case apply the slightly sawtooth profile pulse voltage that sharply descends slowly that rises shown in Fig. 5 (a), then piezoelectric actuator PZ sharply extends when pulse is risen, slowly shrinks when ratio rises when descending.During piezoelectric actuator PZ elongation, driving shaft DS is advanced to Fig. 3 inboard (wall W1 side) by its impulsive force, and the linking part HDb of the optical element support LHD2 of support of lens L3 and laminated spring SG be because inertia and mobile with driving shaft DS, and produce between the driving shaft DS to slide to rest on the origin-location and (mobile a little situation is also arranged).When the phase back pulse descends, compare driving shaft DS when rising and slowly return, thus linking part HDb and laminated spring SG relative drive shaft DS do not slide, but mobile with driving shaft DS side (wall W2 side) in front of Fig. 3.That is to say, be set at hundreds of pulses of arriving tens thousand of hertz by applying frequency, can make the speed continuous moving of optical element support LHD2 to be hoped.From the above, if apply the rapid pulse of rising slow decreasing shown in Fig. 5 (b), then can make optical element support LHD2 mobile round about.Especially as long as axis of guide GS is straight, optical element support LHD2 is mobile well in the optical axis direction precision, compares to drive to cause when producing light shaft offset, can effectively suppress aberration deteriorated.
The optical take-up apparatus of present embodiment can carry out information recording/and/or regeneration to high density DVD, DVD, the different types of CD of CD3 kind.Because the CD protecting layer thickness is different, there is the spherical aberration of optically focused to occur on the information recording surface.In the present embodiment, by corresponding with employed CD, the lens L3 of collimating optical system COL is moved at optical axis direction, change the angle of divergence of passing light beam, under the state of having revised above-mentioned spherical aberration, carry out information recording/and/or regeneration.And the low structure of the driving means cost of present embodiment is small-sized, so be conducive to the cost degradation miniaturization of optical take-up apparatus.
There is in addition kind of a CD to be provided with 2 layers of information recording surface.So spherical aberration owing to occuring in the light beam of protective layer thickness difference optically focused on information recording surface in the information recording surface of this CD.This moment is according to the present invention, by corresponding with the information recording surface that carries out information recording/and/or regeneration, the lens L3 of collimating optical system COL is moved at optical axis direction, change the angle of divergence of passing light beam, under the state of having revised above-mentioned spherical aberration, carry out information recording/and/or regeneration.The driving means of present embodiment is because have hyperresponsiveness, so for example in being equipped on the optical take-up apparatus of computer, also enough can deal with when the DVD of 2 layers of structure etc. is carried out random access.And the spherical aberration that 1 week of CD revolution causes because protective layer thickness is inhomogeneous also can suitably be revised by driving lens L3 with high answer speed.
When the variations in refractive index plastic raw materials greatly that object lens OBJ is changed by relative temperature formed, the atmospheric temperature variation caused producing spherical aberration in the light beam of optically focused on the optical disc information record surface.During above-mentioned situation, by according to the signal that does not have illustrated temperature sensing to send, make the lens L3 of collimating optical system COL mobile at optical axis, change the angle of divergence of passing light beam, can under the state of having revised above-mentioned spherical aberration, carry out information recording/and/or regeneration.
Above-mentioned aberration correction also can followingly be carried out: the CN such as CPU detect means (do not have diagram) according to the signal of accepting the catoptrical optical detector PD of optical disc information record surface and sending, calculate CN, detect aberration from the degradation of CN, transmit indication to driving loop (not diagram), drive piezoelectric actuator PZ to the direction control that reduces aberration.
Subsequent assembly method to driver element CU (manufacture method of optical take-up apparatus) explains.Base (standard station) B has the reference field parallel with the axis of guide.Specifically, with the 1st face P1 shown in the profile line and for the 2nd face P2 of base reverse side be the reference field of base.The 1st face P1 is vertical with the 2nd face P2.In front operation, at the lens L3 of collimating optical system COL subscript center mark CM, then it is embedded optical element support LHD2 and bonding first.The internal diameter of preferred optics element bracket LHD2 is only slightly greater than the external diameter of lens L3.So easy mounted lens L3 on optical element support LHD2, and skew easily appears in the optical axis of the optical axis of optical element and light source, but because be take center mark as benchmark lens L3 to be assembled among the driver element CU as the back will be narrated, so be not a problem even skew easily occurs for optical element support LHD2 and lens L3 yet.
At this, the center mark CM that is marked with lens L3 be positioned at leave the 1st the pre-spacing From Δ of reference field P1 xF, when leaving the 2nd the pre-spacing From Δ of reference field P2 yF ground lens and being loaded into optical take-up apparatus, center mark is consistent with the 1st optical axis direction position (position among Fig. 3 shown in the solid line).And in fact the 1st the pre-spacing From Δ of reference field P1 x of center mark CM distance, the 2nd reference field P2 of distance of being marked with of lens L3 apart from From Δ y.Optical the detecting such as CCD can be adopted in the position of center mark CM relative datum face.
In order to make Δ x=Δ xF, Δ y=Δ yF, in the optical element support, adjust position and the bonding of lens.Depend alone when the adjustment lens position does not reach Δ x=Δ xF, Δ y=Δ yF in the optical element support, also can adjust the position of optical element support, so that satisfy Δ x=Δ xF, Δ y=Δ yF.
When Δ x ≠ Δ xF or Δ y ≠ Δ yF, the lens L3 that can be judged as collimating optical system COL drives at optical axis direction and generation is rocked (displacement of optical axis vertical direction).At this, make relative the 1st the reference field P1 of axis of guide GS and driving shaft DS or the 2nd reference field P2 displacement and displacement just in time be equivalent to (Δ x-Δ xF) or (Δ y-Δ yF).Again measure, when Δ x ≠ Δ xF or Δ y ≠ Δ yF, adjust equally again.Repeatedly adjust equally, when Δ x=Δ xF, Δ y=Δ yF, can be fixed in addition the operation of the axis of guide and driving shaft.So regardless of lens L3 optical axis direction position, optical axis rock elimination, can access the optical characteristics of hoping.
Make above-mentioned the 1st reference field P1 and the 2nd reference field P2 that is adjusted the driver element of good optical element is housed, run into orthogonal the 1st reference field and the 2nd reference field of optical take-up apparatus, be fixed, can easily make like this optical axis of light source and the consistent optical take-up apparatus of optical axis of lens.
Abovely describe the present invention with reference to embodiment, but the present invention is not construed as limited to above-mentioned embodiment, change and improvement can suit.
Claims (6)
1. the manufacture method of an optical take-up apparatus, this optical take-up apparatus has: the optical element that possesses 2 optical surfaces; Support the optical element support of described optical element; At lead 2 axis of guides of described optical element support of optical axis direction; Drive the gearing of described optical element support at optical axis direction; Driver element with standard station of the described axis of guide of direct or indirect support and described gearing; The optical take-up apparatus manufacture method is characterised in that,
At least 1 described optical surface of described optical element has center mark,
Described standard station has the reference field parallel with the described axis of guide,
Comprise following operation:
On described optical element support, described optical element is configured to: the relation of the center mark of being paid on the optical surface of described optical element and the described reference field Cheng Suoding of described standard station, this fixed relation is that the distance with described axis of guide vertical direction of the described reference field of described center mark and described standard station becomes institute's set a distance of being made in advance;
The reference field that makes the described reference field of the described standard station of the described driver element that has configured described optical element run into described optical take-up apparatus is fixed.
2. such as the manufacture method of optical take-up apparatus of record in the claim 1, it is characterized in that, the described reference field of described standard station comprises crossing the 1st face and the 2nd face, and the 1st face is parallel with the described axis of guide with the 2nd face, described center mark and described the 1st face with the distance of axis of guide vertical direction and described center mark and described the 2nd face with the distance of axis of guide vertical direction, remain unchanged with the location independent of described optical element support.
3. such as the manufacture method of optical take-up apparatus of record in claim 1 or 2, it is characterized in that, described driver element has described gearing for the motor inverting element, being fixed on the driver part of described motor inverting element one end, linking with described optical element support and being supported for can be at the mobile movable member of described driver part, repeatedly flexible by making described motor inverting element change speed in flexible direction, described movable member is moved, and described driver part is 1 axis of guide in described 2 axis of guides.
4. an optical take-up apparatus has: the optical element that possesses 2 optical surfaces; Support the optical element support of described optical element; At lead 2 axis of guides of described optical element support of optical axis direction; Drive the gearing of described optical element support at optical axis direction; Driver element with standard station of the described axis of guide of direct or indirect support and described gearing; Optical take-up apparatus is characterised in that,
Paid center mark at least 1 described optical surface of described optical element,
Described standard station has the reference field parallel with the described axis of guide,
Be configured at described the above optical element of optical element support: the relation of the center mark of being paid on the optical surface of described optical element and the described reference field Cheng Suoding of described standard station, this fixed relation is, the distance with described axis of guide vertical direction of the described reference field of described center mark and described standard station becomes institute's set a distance of being made in advance
The reference field that makes the described reference field of the described standard station of the described driver element that has configured described optical element run into described optical take-up apparatus is fixed.
As in the claim 4 record optical take-up apparatus, it is characterized in that, the described reference field of described standard station comprises crossing the 1st face and the 2nd face, and the 1st face is parallel with the described axis of guide with the 2nd face, described center mark and described the 1st face with the distance of axis of guide vertical direction and described center mark and described the 2nd face with the distance of axis of guide vertical direction, remain unchanged with the location independent of described optical element support.
As in claim 4 or 5 record optical take-up apparatus, it is characterized in that, described driver element has described gearing for the motor inverting element, being fixed on the driver part of described motor inverting element one end, linking with described optical element support and being supported for can be at the mobile movable member of described driver part, repeatedly flexible by making described motor inverting element change speed in flexible direction, described movable member is moved, and described driver part is 1 axis of guide in described 2 axis of guides.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007069841 | 2007-03-19 | ||
| JP069841/2007 | 2007-03-19 | ||
| PCT/JP2008/054173 WO2008126536A1 (en) | 2007-03-19 | 2008-03-07 | Method for manufacturing optical pickup device, and optical pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101647067A CN101647067A (en) | 2010-02-10 |
| CN101647067B true CN101647067B (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880008678.7A Expired - Fee Related CN101647067B (en) | 2007-03-19 | 2008-03-07 | Method for manufacturing optical pickup device, and optical pickup device |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JP4285588B2 (en) |
| CN (1) | CN101647067B (en) |
| WO (1) | WO2008126536A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5179332B2 (en) * | 2008-12-04 | 2013-04-10 | シャープ株式会社 | Lens position adjustment mechanism for optical pickup device, optical pickup device, optical disk device, and lens position adjustment method for optical pickup device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1404605A (en) * | 2000-12-22 | 2003-03-19 | 皇家菲利浦电子有限公司 | Optical scanning device and optical player comprising such a scanning device |
| CN1503240A (en) * | 2002-11-20 | 2004-06-09 | 上海乐金广电电子有限公司 | Leading-axle regulator for optical disc driver |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11110767A (en) * | 1997-09-30 | 1999-04-23 | Sony Corp | Optical pickup device |
| JP4224654B2 (en) * | 1999-06-17 | 2009-02-18 | 旭硝子株式会社 | Optical head device |
| JP4337036B2 (en) * | 2003-10-21 | 2009-09-30 | ソニー株式会社 | Information processing device |
| JP2005302118A (en) * | 2004-04-09 | 2005-10-27 | Konica Minolta Opto Inc | Optical pickup device |
| JP2006120287A (en) * | 2004-10-25 | 2006-05-11 | Canon Inc | Optical pickup device |
| JP2006172666A (en) * | 2004-12-20 | 2006-06-29 | Pulstec Industrial Co Ltd | Optical pickup device, and method for attaching lens holder in optical disk device |
| WO2007122848A1 (en) * | 2006-03-29 | 2007-11-01 | Mitsubishi Electric Corporation | Lens driving device, optical pickup device and installation adjusting method |
-
2008
- 2008-03-07 WO PCT/JP2008/054173 patent/WO2008126536A1/en active Application Filing
- 2008-03-07 JP JP2008540805A patent/JP4285588B2/en not_active Expired - Fee Related
- 2008-03-07 CN CN200880008678.7A patent/CN101647067B/en not_active Expired - Fee Related
- 2008-09-22 JP JP2008242247A patent/JP5152582B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1404605A (en) * | 2000-12-22 | 2003-03-19 | 皇家菲利浦电子有限公司 | Optical scanning device and optical player comprising such a scanning device |
| CN1503240A (en) * | 2002-11-20 | 2004-06-09 | 上海乐金广电电子有限公司 | Leading-axle regulator for optical disc driver |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-302118A 2005.10.27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4285588B2 (en) | 2009-06-24 |
| JP5152582B2 (en) | 2013-02-27 |
| JPWO2008126536A1 (en) | 2010-07-22 |
| JP2008305554A (en) | 2008-12-18 |
| CN101647067A (en) | 2010-02-10 |
| WO2008126536A1 (en) | 2008-10-23 |
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