CN100397509C - Optical pickup and optical disk apparatus - Google Patents
Optical pickup and optical disk apparatus Download PDFInfo
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- CN100397509C CN100397509C CNB2005101249544A CN200510124954A CN100397509C CN 100397509 C CN100397509 C CN 100397509C CN B2005101249544 A CNB2005101249544 A CN B2005101249544A CN 200510124954 A CN200510124954 A CN 200510124954A CN 100397509 C CN100397509 C CN 100397509C
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Abstract
An optical pickup includes a first optical system for collecting first laser light emitted from a first laser light source onto a first disk, and guiding reflected light from the first disk to a photoreceptor; a second optical system for collecting second laser light emitted from a second laser light source onto a second disk, and guiding reflected light from the second disk to a photoreceptor; a second objective lens for collecting the second laser light onto the second disk and receiving the reflected light from the second disk, the second objective lens being movable in a radial direction passing through the center of the second disk, and a first objective lens for collecting the first laser light onto the first disk and receiving the reflected light from the first disk, the first objective lens being disposed offset from the radial direction and adjacently to the second objective lens.
Description
The cross reference of related application
The present invention comprise about on September 22nd, 2004 the Japanese patent application JP2004-274604 of Jap.P. office application and on November 5th, 2004 at the theme of the Japanese patent application JP2004-322338 of Jap.P. office application, merge as a reference at this its full content.
Technical field
The present invention relates to can be to three types the dish executive logging or the light picker and the optical disc apparatus of playback, that is, CD (compact disk), DVD (digital universal disc) and CD of future generation are as the registered Blu-ray Disc of trade mark (below be abbreviated as " BD ").Particularly, the present invention relates to the configuration of CD/DVD object lens and BD object lens.
Background technology
In the last few years, record thereon and the CD and the DVD of reproduced picture information and music information is very general from it.For the demand of the further growth of satisfying recording density and capacity, CD of future generation for example, is used the Blu-ray Disc of the laser with the 407nm wavelength in the blue light wavelength scope, is introduced into.
Correspondingly, the optical disc apparatus to these dish executive loggings and playback has been developed and commercialization.Described optical disc apparatus comprises: two light pickers, that is to say, and a light picker and a light picker that only is used for BD that is used for CD and DVD, perhaps energy is to the independent light picker of CD, DVD and BD executive logging and/or playback.From the viewpoint in space, installation can be very natural to an independent light picker of CD, DVD and BD executive logging and/or playback.For example, the light picker that in the uncensored patented claim No.2003-323735 of Japan, discloses.
When with a single light picker to CD, DVD and BD executive logging or playback time, it is necessary reducing the size and the weight of pick-up and correspondingly improving writing speed.Correspondingly, the object lens of need arranging to be used for the object lens of CD and DVD and only being used for BD are applied to laser on the CD and from CD and receive reflected light.
Usually, along with light picker along the moving of disc radial direction direction, the object lens of contiguous CD configuration move along the radial direction of CD, and the arbitrary address on the visit rotary CD is with record or replay data.Thus, shown in Fig. 4 A, be arranged side by side in the light picker so that under the corresponding to situation of radial direction of moving direction therein and CD 3 at CD/DVD object lens 1 and BD object lens 2, when light picker moved to interior all side of CD 3, the object lens 2 that are configured in the outside can not be visited at the record data or the posting field of interior all sides.
Shown in Fig. 4 B, when CD/DVD object lens 1 are configured on the radius of CD 3, as previously mentioned, and BD object lens 2 are configured in the next door of object lens 1 along the direction perpendicular to the radial direction of CD 3, and object lens 1 and 2 can both be visited at the CD 3 record data or the posting field of interior all sides.Yet, because BD object lens 2 are configured in the position of the radius that departs from CD 3 a little, that is to say, outside optimum position, even when light picker was configured in the orbital position of expectation by DDP or three beam tracking servo method, the amplitude of the signal that obtains by the side beam that receives reflection at interior all sides of CD 3 and outer circumferential side also can produce big deviation.At last, the precision of DDP or the control of three beam tracking servo reduces, or tracking servo control becomes impossible.
From top situation, expectation provides a light picker, during record or playback CD, DVD and BD, allow common tracking servo control, can visit the record or the playback area of interior all sides of each CD, and can write down smoothly or the playback dish on signal, and provide one to use described optical disk of optical pick-up device.
The optical maser wavelength that is used for CD is 780nm, and the optical maser wavelength that is used for DVD is 650nm.These two wavelength are approaching toward each other.Therefore, the CD drive that is used for CD and DVD is used common light path, and comprising: object lens and collimation lens are used for CD laser and DVD laser, thereby reduce the overall dimensions of described driver.This technology, for example disclosed in the uncensored patented claim No.2002-298869 of Japan.
Use and have wavelength and drop in the practical application recently as the Blu-ray Disc (BD) of the royal purple laser of 405nm.Because the optical maser wavelength that the optical maser wavelength that BD uses is used than other known optical disc is short significantly, thus they have than same diameter capacity several times the recording capacity greatly of DVD.Be fit to three kinds of wavelength and can be used for BD, the CD drive that also can be used for CD and DVD has also dropped into practical application.Yet as mentioned above, the optical maser wavelength that is used for BD is 405nm, and obviously different with the optical maser wavelength that is used for CD and DVD.Therefore, design is a kind of is very difficult by three kinds of shared object lens of wavelength.Thus, in the CD drive that is fit to three kinds of wavelength, it is real in a light picker two object lens being installed, that is, and and BD object lens and CD/DVD object lens.
When the BD light path was separated by this fully with the CD/DVD light path, the design of light picker was easy, but the size of light picker can increase.Therefore, in the three-wavelength light picker, it is possible that two object lens are installed on a dual-axis actuator, that is, BD object lens and CD/DVD object lens are so that enter in the corresponding separately object lens from the laser of BD light path with from the laser of CD/DVD light path.
In this case, need two lifting mirrors on the object lens of directing a laser to that are used for BD and are used for CD/DVD.Yet in fact, described dual-axis actuator has the structure of the complexity that comprises lens holding system and drive coil, and therefore, the scope that laser enters the twin shaft driver is restricted.Especially, the integral thickness that is installed in the glimmer disk drive (so-called elongated driver) in the notebook personal computer is restricted, and the inlet scope of laser further is restricted.Thereby the thickness that reduces light picker itself is difficult.
From above-mentioned problem as can be seen, expectation proposes a kind of light picker and CD drive that has thin structure and can be suitable for the multi-wavelength.
Summary of the invention
According to the present invention, a kind of light picker is provided, comprising: first optical system, being used for will be from first laser focusing of first LASER Light Source emission at first dish, and receive and the reflected light that guides first dish to first optical receiver; Second optical system, being used for will be from second laser focusing of second LASER Light Source emission at second dish, and receive and the reflected light that guides second dish to second optical receiver, described second laser has the wavelength longer than first Wavelength of Laser; Second object lens are used for second laser focusing to the second dish, and receive the reflected light of second dish, and described second object lens can be moving by second disk center in the radial direction; First object lens are used for first laser focusing to the first dish, and receive and guide the reflected light of first dish, described first object lens to depart from described radial direction and contiguous described second object lens configuration; And the light path colligator, be used for partly in conjunction with described first and second optical systems, to form in conjunction with light path; And optical path separator, be used for described separate arrive described first and second object lens in conjunction with light path before described in conjunction with light path.
According to the present invention, a kind of optical disc apparatus is provided, has comprised light picker, wherein said light picker comprises: first optical system, being used for will be from first laser focusing of first LASER Light Source emission at first dish, and receive and the reflected light that guides first dish to first optical receiver; Second optical system, being used for will be from second laser focusing of second LASER Light Source emission at second dish, and receive and the reflected light that guides second dish to second optical receiver, described second laser has the wavelength longer than first Wavelength of Laser; Second object lens are used for second laser focusing to the second dish, and receive the reflected light of second dish, and described second object lens can be moving by second disk center in the radial direction; First object lens are used for first laser focusing to the first dish, and receive and the reflected light that guides first dish to first optical receiver, described first object lens depart from described radial direction and contiguous described second object lens configuration; And the light path colligator, be used for partly in conjunction with described first and second optical systems, to form in conjunction with light path; And optical path separator, be used for described separate arrive described first and second object lens in conjunction with light path before described in conjunction with light path.
Light picker according to one embodiment of the present of invention comprises: first optical system, being used for will be from first laser focusing of first LASER Light Source emission at first dish, and receive and the reflected light that guides first dish to first optical receiver; Second optical system, being used for will be from second laser focusing of second LASER Light Source emission at second dish, and receive and the reflected light that guides second dish to second optical receiver, described second laser has the wavelength longer than first Wavelength of Laser; Second object lens are used for second laser focusing to the second dish, and receive the reflected light of second dish, and described second object lens can be moving by second disk center in the radial direction; And first object lens, be used for first laser focusing to the first dish, and receive and guide the reflected light of first dish, described first object lens to depart from described radial direction and contiguous described second object lens configuration.
Preferably, during the record or second dish of resetting, carry out tracking servo control by DPP method or three beam method, and during the record or first dish of resetting, carry out tracking servo control by any one method in simple beam method, phase shift DPP method and the 5 luminous point DPP methods.
According to this embodiment, CD/DVD object lens as second object lens are so disposed, so that its moving direction is consistent with the radial direction of the CD (CD or DVD) at the center of rotating shaft center that passes through spindle motor or CD, and the moving direction configuration that will depart from described CD/DVD object lens as the BD object lens of first object lens.Therefore, from the rotation center of CD to the CD/DVD object lens and to the distance of BD object lens much at one, and two object lens can both be visited the recording/reproducing zone of interior all sides of CD.Further, because the moving direction of CD/DVD object lens is consistent with the radial direction of CD (CD or DVD), can avoid because the reduction of the precision of DPP or three beam tracking servo control, or because the big deviation tracking servo of the signal amplitude that the side beam of the reflection of the reception between interior all sides that are formed on CD and the outer circumferential side obtains is controlled the problem that becomes and can not cause.
About the signal that obtains from the light of BD object lens reflections, can be by using the simple beam method, any one method in phase shift DPP method and the 5 luminous point DPP methods is carried out tracking servo and is controlled and avoid the problems referred to above.This just makes and any one of DVD, CD and BD is being write down or playback duration is carried out common tracking servo control, and visit becomes possibility in the recording/reproducing zone of interior all sides of dish arbitrarily.Therefore, signal can be recorded on any dish smoothly or reset from it.
Dispose described CD/DVD object lens, make its moving direction consistent, and the BD object lens depart from the straight line configuration of the moving direction of described CD/DVD object lens with the radial direction of CD (CD or DVD).Therefore, do not consider the kind of CD, reduce owing to be formed on the influence that the big deviation of the amplitude of the tracking error signal between interior all sides of CD and the outer circumferential side is brought, in the tracking servo control of any one dish being write down or the playback duration execution is common, and visit every kind of CD recording/reproducing zone of interior all sides, become possibility.This is recorded on any dish with allowing signal smoothing or resets from it.
Light picker according to another embodiment of the present invention comprises: first LASER Light Source is used to launch first laser; First object lens provide corresponding to first optical maser wavelength, with first laser aiming to the first CD; Second LASER Light Source is used to launch and has second laser different with described first Wavelength of Laser; Second object lens provide corresponding to second optical maser wavelength, with second laser aiming to the second CD; First light path, be used for from first laser aiming of first LASER Light Source to described first object lens; Second light path, be used for from second laser aiming of second LASER Light Source to described second object lens; The light path colligator is used for partly in conjunction with described first and second light paths; And optical path separator, be used for first and second light paths of separating arrive described first and second object lens in conjunction with light path before by the combination of described light path colligator described.
Preferably, described first and second object lens are provided on the same dual-axis actuator, and the light path colligator carried out combination with described first and first light path before first laser and second laser enter described dual-axis actuator.
Because first and second light paths are combined before described dual-axis actuator, and it is separated before first and second object lens, therefore constructing a thin light picker and be suitable for the multi-wavelength's and comprise the CD drive of a dual-axis actuator thin, that laser inlet scope is restricted, is possible.
Description of drawings
Fig. 1 is the structural representation of expression light picker according to an embodiment of the invention;
Fig. 2 A is the synoptic diagram of a kind of configuration mode of expression CD/DVD object lens shown in Figure 1 and DVD object lens;
Fig. 2 B is the synoptic diagram of the another kind of configuration mode of expression CD/DVD object lens and DVD object lens;
Fig. 3 is a structured flowchart of representing the major part of optical disc apparatus according to another embodiment of the present invention;
Fig. 4 A and 4B are the key diagrams of representing how to dispose two object lens;
Fig. 5 is a key diagram of representing how to adjust grating in the CD/DVD optical system;
Fig. 6 is a key diagram of representing how to adjust grating in the BD optical system;
Fig. 7 is an integrally-built perspective schematic view of representing CD drive according to still another embodiment of the invention;
Fig. 8 is the structural representation of the light picker that provides in the CD drive of expression;
Fig. 9 is the synoptic diagram of a kind of configuration mode of element in the expression light picker; With
Figure 10 is the synoptic diagram of the another kind of configuration mode of expression element.
Embodiment
Any one writes down or playback duration in to DVD, CD and BD, in order to carry out common tracking servo control, visit is positioned at the recording/reproducing zone of all sides of every kind of CD, and or from the described dish record or reproducing signal reposefully, configuration CD/DVD object lens make its moving direction consistent with the radial direction of CD (CD or DVD), and BD object lens and CD/DVD object lens are configured on the extended line perpendicular to the moving direction of described CD/DVD object lens with being offset.
Below with reference to accompanying drawings one embodiment of the present of invention are described in detail.
(1) one-piece construction of CD drive
Fig. 7 has shown application CD drive 101 of the present invention, and wherein disk in pallet 103 is connected in the box-like housing 102 movably, so that its load or unload from housing 102.Disk in pallet 103 comprises: chuck (chuck) 104, and CD 100 is mounted thereto; The spindle motor (not shown) is used for by chuck 104 rotary CDs 100; Light picker 110 is used for laser radiation on the record surface of CD 100 and receive light from CD reflection; And the coasting mechanism (not shown), be used to make the in the radial direction to-and-fro movement of overall optical pick-up 110 at CD 100.
(2) structure of light picker
Fig. 8 has shown the light picker 110 that is fit to three kinds of wavelength, and wherein various optical elements are installed on the base 111.The optical system of light picker 110 comprises: CD/DVD optical system 120 is used for record or playback CD and DVD; BD optical system 140 is used for record or playback BD; And public optical system 160, be common to three types CD, CD, DVD and BD.
(2-1) structure of CD/DVD optical system
In CD/DVD optical system 120, launch from CD/DVD laser diode 121 as the radiative laser of the CD/DVD of first laser as first LASER Light Source, by coupled lens 122, catoptron 123, grating 124 and beam splitter 125, enter collimation lens 126 then successively.Collimation lens 126 is launched light with CD/DVD and is converted directional light to, and described light is directed to public optical system 160.
Light path in public optical system 160 vertically reflects the radiative part of CD/DVD in conjunction with beam splitter 161, and described light is directed to the preceding photodiode 127 that is used for the laser power detection.Though will be described in detail below, but public optical system 160 is applied to the radiative another part of CD/DVD on the record surface of CD 100 via CD/DVD object lens 162, receive reflected light from record surface as the CD/DVD incident light by CD/DVD object lens 162, and reflected light is guided to CD/DVD optical system 120.
In the CD/DVD optical system, the CD/DVD incident light enters beam splitter 125 via collimation lens 126.Beam splitter 125 vertical reflection CD/DVD incident lights, and described light guided to via cylindrical lens 128 and holographic element 129 detect PDIC (photoelectric detector IC) 130.130 pairs of CD/DVD incident lights of PDIC carry out opto-electronic conversion, and export various signals, as replay signal, tracking error signal and focus error signal.
(2-2) structure of BD optical system
In BD optical system 140, as the radiative laser of the BD of second laser from BD laser diode 141 emission as second LASER Light Source, and by as wavelength plate, grating or the polarizer 142 that carefully closes device enter beam splitter 143 after rotating its plane of polarizations.
Light path in public optical system 160 vertically reflects BD emission light in conjunction with beam splitter 161, and via BD object lens 163 described light is applied on the record surface of CD 100.Light path also receives light from the record surface reflection as the BD incident light by BD object lens 163 in conjunction with beam splitter 161, and described light is guided to BD optical system 140.
In BD optical system 140, the BD incident light enters beam splitter 146 via collimation lens 148 and catoptron 147.Beam splitter 146 transmits the BD incident lights, and described light is guided to detection PDIC 151 via holographic element 149 and coupled lens 150.151 pairs of BD incident lights of PDIC carry out opto-electronic conversion, and export various signals, as replay signal, tracking error signal and focus error signal.
(2-3) structure of public optical system
Now the structure to the public optical system 160 of performance characteristic of the present invention describes in detail.In public optical system 160, CD/DVD object lens 162 and BD object lens 163 are installed on the same dual-axis actuator 168, and promote mirror 166 and CD/DVD by BD and promote lifting mirror unit 165 that mirror 167 forms and be positioned at below CD/DVD object lens 162 and the BD object lens 163.
Or rather, as shown in Figure 9, CD/DVD promote mirror 166 be arranged in CD/DVD object lens 162 below, and BD promote mirror 167 be arranged in BD object lens 163 below.Light path promotes mirror 167 in conjunction with beam splitter 161, BD and CD/DVD promotes mirror 166 arrangements in alignment.
As mentioned above, CD/DVD emission light and BD emission light all enters light path as the light path colligator in the public optical system 160 in conjunction with beam splitter 161.In conjunction with after the beam splitter 161, be correcting spherical aberration by light path, CD/DVD emission light and BD emission light promote mirror 167 via the BD that liquid crystal cell 164 enters as optical path separator.
BD promotes mirror 167 and selects beam splitter to constitute by wavelength, and the royal purple laser that is 405nm for Blu-ray Disc with 90 ° of reflection wavelengths only.For this reason, when the incident of BD emission light, BD promotes mirror 167 and upwards reflects BD emission light, and via BD object lens 163 described light is applied to CD 100 (referring to Blu-ray Disc in this case).BD promotes the reflected light that mirror 167 also receives from BD via BD object lens 163, and described light is guided to BD optical system 140 via liquid crystal cell 164 and light path in conjunction with beam splitter 161.
On the contrary, when the incident of CD/DVD emission light, BD lifting mirror 167 is with described light transmission and guide to CD/DVD lifting mirror 166.CD/DVD promotes mirror 166 and upwards reflects CD/DVD emission light, and via CD/DVD object lens 162 described light is applied to CD 100 (referring to CD or DVD in this case).CD/DVD promotes the reflected light that mirror 166 receives from CD or DVD via CD/DVD object lens 162, and in conjunction with beam splitter 161 described light is guided to CD/DVD optical system 120 via BD lifting mirror 167, liquid crystal cell 164 and light path.
(3) operation and advantage
In said structure, CD/DVD object lens 162 and BD object lens 163 are installed on the same dual-axis actuator 168 in the light picker 110, and all enter in conjunction with beam splitter 161 via the light path the public optical system 160 from the CD/DVD emission light of CD/DVD optical system 120 emissions with from the emission light of BD optical system 140 emissions and to promote mirror unit 165.Promote mirror 167 separation of C D/DVD emission light and BD emission light by the BD that selects beam splitter to constitute by wavelength, and via corresponding object lens 162 and 163 emission CD/DVD emission light and BD emission light.
Incide the CD/DVD emission light and the BD radiative light path that promote mirror unit 165 by light path in conjunction with beam splitter 161 by such combination, CD/DVD emission light and BD emission light transmit to the dual-axis actuator 167 of fixing object lens 162 and 163 in public light path.Thereby the light picker 110 that is suitable for three kinds of wavelength can use the thin dual-axis actuator 167 with limited laser incident scope.
In said structure, CD/DVD emission light and the radiative light path of BD in conjunction with partly combination of beam splitter 161, and in that to promote mirror unit 165 separated, make CD/DVD emission light and BD emission light enter corresponding object lens 162 and 163 by light path.Therefore, the glimmer pick-up 110 that is suitable for three kinds of wavelength can use the thin dual-axis actuator 167 with limited laser incident scope.This CD drive 101 that allows to be suitable for multi-wavelength has thin structure.
(4) variant embodiment
In the above-described embodiments, though these two light paths of CD/DVD and BD light path in conjunction with beam splitter 161 in by partly combination, the present invention also is confined to this embodiment.For example, three light paths, that is, CD light path, DVD light path and BD light path can be provided respectively, can be by light path in conjunction with the beam splitter combination, and can be directed to and promote mirror unit 165.CD drive 101 not only goes for CD, DVD and BD, and applicable to other various CDs.
In the structure of as shown in Figure 9 public optical system 160, the conversion each other of the position of CD/DVD object lens 162 and BD object lens 163, CD/DVD promote mirror 166 can be configured in CD/DVD object lens 162 below, and BD promote mirror 167 can be configured in BD object lens 163 below, as shown in figure 10.In this case, light path also can be arranged point-blank in conjunction with beam splitter 161, BD lifting mirror 167 and CD/DVD lifting mirror 166.
Or rather, as shown in figure 10, arrange CD/DVD object lens 162 and BD object lens 163 make CD/DVD emission light and BD emission light by light path in conjunction with beam splitter 161 after, the CD/DVD that enters as optical path separator promotes in the mirror 166.
CD/DVD promotes mirror 166 and selects beam splitter to constitute by wavelength, and transmission has the royal purple laser that wavelength is 405nm to Blu-ray Disc.For this reason, when the incident of BD emission light, CD/DVD promotes mirror 166 transmission BD emission light, and described light is guided to BD lifting mirror 167.BD promotes mirror 167 and upwards reflects BD emission light, described light is applied to CD 100 (this situation refers to BD) via BD object lens 163, and will guides to BD optical system 140 via liquid crystal cell 164 and light path in conjunction with beam splitter 161 from the reflected light that BD receives via BD object lens 163.
On the contrary, when the incident of CD/DVD emission light, CD/DVD promotes mirror 166 upwards with 90 ° of reflection CD/DVD emission light, and described light is applied to CD 100 (CD or DVD) via CD/DVD object lens 162.CD/DVD promotes the reflected light that mirror 166 also receives from CD or DVD via CD/DVD object lens 162, and described light is guided to CD/DVD optical system 120 via liquid crystal cell 164 and light path in conjunction with beam splitter 161.
In structure as shown in figure 10, when BD object lens 163 were made by the material heavier than the material of CD/DVD object lens 162, for example, when BD object lens 163 are made by glass, and CD/DVD object lens 162 were when being made of plastics, and the center of gravity of actuator 168 is positioned near the fixed position.This can improve the characteristic of actuator 168.
Fig. 1 has shown the structural representation of light picker according to a second embodiment of the present invention.In the light picker of second embodiment, wavelength is that the laser of 407nm is launched from BD laser diode 11, and focuses on the BD (not shown) by half-wave plate 12, beam splitter 13, grating 16, beam splitter 17, catoptron 18, collimation lens 19, three-wavelength beam splitter 20,1/4 wavelength plate 22 and BD object lens 23.In this case,, and be focused lens 14 and focus on the preposition monitor photodiode IC 15 through beam splitter 13 from the part of BD laser diode 11 emitted laser.Reflected light from BD passes through BD object lens 23,1/4 wavelength plates 22, three-wavelength beam splitter 20, collimation lens 19, catoptron 18, beam splitter 17 and holographic element (HOE) 25, and is focused on the photodiode IC 27 by many object lens 26.Said elements constitutes the BD optical system in the light picker that is installed in second embodiment.
In light picker, the wavelength that is used for CD or DVD is that the laser of 780nm or 650nm is launched from CD and/or DVD laser diode 28, and focuses on CD or the DVD (not shown) through coupled lens 29, catoptron 30, grating 31, dual wavelength beam splitter 32, collimation lens 33, three-wavelength beam splitter 20,1/4 wavelength plate 22 and DVD/CD object lens 24.In this case, the part from CD/DVD laser diode 28 emitted laser focuses on the preposition monitor photodiode IC 21 after its light path is rotated 90 ° by beam splitter 20.From reflected light process CD/DVD object lens 24,1/4 wavelength plate 22, three-wavelength beam splitter 20, collimation lens 33, dual wavelength beam splitter 32, cylindrical lens 34 and the holographic element (HOE) 35 of CD or DVD, and focus on the photodiode IC 36.Said elements constitutes the CD/DVD optical system in the light picker that is installed in second embodiment.Described optical system comprises dual wavelength diode 28 that is used for CD and DVD and the laser diode 11 that only is used for BD.Therefore, when switching, can carry out record or the playback of CD, DVD and BD by single light picker by 20 pairs of above-mentioned light paths of three-wavelength beam splitter.Above-mentioned optical system is contained in the housing 38 of light picker.Housing 38 can move along the radial direction of CD 100 to slide along stationary shaft 39.
For record or the playback of carrying out CD or DVD, for example,, be used for the laser of the 780nm of CD from laser diode 28 emissions in order to carry out record or the playback of CD (CD-R, CD-RW, CD-ROM).In order to carry out record or the playback of DVD (DVD-R, DVD-RW, DVD-RAM, DVD-ROM), be used for the laser of the 650nm of DVD from laser diode 28 emissions.Every kind of laser is applied on CD or the DVD by above-mentioned CD/DVD optical system.Laser diode 28 can be only to be used for single wavelength diode of CD, only to be used for single wavelength diode of DVD and be used for CD and the two any one of dual wavelength diode of DVD.
As mentioned above, housing 38 can move on the horizontal direction in Fig. 1, and CD 100 rotations.Therefore, be installed in CD/DVD object lens 24 in the light picker or BD object lens 23 and can visit any recording/reproducing zone on the CD 100.For example, shown in Fig. 2 A, CD/DVD object lens 24 move on the radius (process is used for a line at the spindle motor center of rotary CD 100) 60 of CD 100.Selectively, the position conversion each other of CD/DVD object lens 24 and BD object lens 23 is shown in Fig. 2 B.
According to second embodiment, because CD/DVD object lens 24 move on the radius 60 of CD 100, therefore control does not have influence to tracking servo.For example, under the accurate tracking servo control of being undertaken by DPP, signal can be recorded on the DVD smoothly.When DVD-ROM by playback time, also can pass through DPD (differential phase detection) and carry out accurate tracking servo control.
On the contrary, the moving direction of BD object lens 23 departs from the radius 60 of CD 100.Therefore, the tracking servo failure may appear.By the way, only use to promote mainly at first as a kind of simple beam method of tracking servo method and draw (MPP) signal as tracking error signal, this signal results from the reflected light of main beam, and the tracking servo failure can not appear in this method.In phase shift DPP method, when the extended line Δ d that departs from the radius 60 by cd centre when the BD object lens places, as shown in Figure 5, adjusting grating makes main beam and side beam almost be arranged in position R (=Δ d*1/ (θ 1+ θ 2)/2, θ 1=tan-1 (Δ d/r1), θ 2=tan-1 (Δ d/r2) along the tangent line of disc tracks, wherein r1 represents the radius of interior all sides, r2 represents the radius of most peripheral side), for example, make the angle that forms between light beam and the tangent line in scope approximately ± 1 °.This just makes the adjustment of the signal that is obtained by side beam reduce to zero, and reduces the influence of the amplitude of variation of the tracking error signal on the disc radial direction direction.As shown in Figure 6, in 5 luminous point DPP methods, use light beam.In this case, be similar to phase shift DPP method and adjust grating.
Therefore, for fear of the tracking servo failure, BD is being write down or playback duration, second embodiment takes any method in simple beam method, phase shift DPP method and the 5 luminous point DPP methods.Therefore, smoothly record or playback are possible.
Fig. 3 has shown the structured flowchart according to the optical disc apparatus major part of third embodiment of the invention.Optical disc apparatus accesses disk 202 as DVD ± R/RW, CD-R/RW or BD, writes down and replay data by light picker 204.This optical disc apparatus comprises: spindle motor 203, as the driver of rotating disc 202; Light picker 204, be used for from or the dish 202 enterprising line data read and writes; Feeding motor 205 is as the driver at dish 202 mobile in the radial direction light picker 204; System controller 207 is used to control whole device; Signal processor 208 is used to carry out predetermined processing, as separating mediation error correction according to the signal of exporting from prime amplifier 220; Servo controller 209 is used to control spindle motor 203 and feeding motor 205; Prime amplifier 220 is used for producing as focus error signal, tracking error signal and RF signal on the basis of the various signals of exporting from light picker 204; Interface 211 is used to connect signal processor 208 and outer computer 230; Laser controller 221 is used for driving the LASER Light Source of light picker 204; Outer computer 230 is used to receive the signal that coils on 202 that is recorded in as replay signal, modulates by 208 pairs of described signals of signal processor, and exports signal to laser controller 221 to drive the LASER Light Source in the light picker 204; D/A A/D converter 212 is used to control signal from signal processor 208 and carries out D/A conversion or control and carry out the A/D conversion from the signal of acoustic image processor 213; And acoustic image processor 213, be used to the audio-visual signal of handling record or resetting.Light picker 204 comprises the optical system of second embodiment as shown in Figure 1.
For example, for mobile light picker 204 to the predetermined recording track of dish on 202, feeding motor 205 is connected with light picker 204.Servo controller 209 is according to the control of the control of carrying out spindle motor 203 from the focus error signal and the tracking error signal of prime amplifier 220 inputs, feeding motor 205 and focusing and the tracking direction control that keeps the dual-axis actuator of object lens light picker 204.Laser controller 221 is controlled under logging mode and replay mode with laser diode 11 in the change light picker 204 and 28 output power.
According to the 3rd embodiment, because CD/DVD object lens 24 move, the tracking servo failure can not appear on the straight line at the center of also passing through CD 100 on the extended line of radial direction.For example, signal can be recorded on the DVD under the accurate tracking servo control of DPP smoothly.Because the moving direction of BD object lens 24 has departed from the radius 60 by CD 100 turning axles, at record or the playback duration of BD, can adopt any tracking servo method, that is, and simple beam method, phase shift DPP method and 5 luminous point DPP methods.This has been avoided the tracking servo failure, and allows level and smooth record or playback.In addition, because object lens 23 and 24 all are configured in the distance position much at one with the turning axle of CD 100, at record or playback duration, they can visit the recording/reproducing zone of interior all sides of any CD 100.
It should be appreciated by those skilled in the art that the present invention not only is confined to the foregoing description, and all be encompassed in the scope of appended claim and equivalence thereof according to various improvement, combination, sub-portfolio and the change that design needs and other factors are carried out.
Claims (5)
1. light picker comprises:
First optical system, being used for will be from first laser focusing of first LASER Light Source emission at first dish, and receive and the reflected light that guides first dish to first optical receiver;
Second optical system, being used for will be from second laser focusing of second LASER Light Source emission at second dish, and receive and the reflected light that guides second dish to second optical receiver, described second laser has the wavelength longer than first Wavelength of Laser;
Second object lens are used for second laser focusing to the second dish, and receive the reflected light of second dish, and described second object lens can be moving by second disk center in the radial direction;
First object lens are used for first laser focusing to the first dish, and receive and guide the reflected light of first dish, described first object lens to depart from described radial direction and contiguous described second object lens configuration; And
The light path colligator is used for partly in conjunction with described first and second optical systems, to form in conjunction with light path; With
Optical path separator, be used for described separate arrive described first and second object lens in conjunction with light path before described in conjunction with light path.
2. light picker according to claim 1, wherein said first LASER Light Source is used for Blu-ray Disc, and described second LASER Light Source is used for CD and/or DVD, and described first object lens are used for Blu-ray Disc, and described second object lens are used for CD and/or DVD.
3. light picker according to claim 1, wherein said first object lens are with perpendicular to contiguous described second object lens configuration of the direction of the moving direction of described second object lens.
4. an optical disc apparatus comprises light picker, and wherein said light picker comprises:
First optical system, being used for will be from first laser focusing of first LASER Light Source emission at first dish, and receive and the reflected light that guides first dish to first optical receiver;
Second optical system, being used for will be from second laser focusing of second LASER Light Source emission at second dish, and receive and the reflected light that guides second dish to second optical receiver, described second laser has the wavelength longer than first Wavelength of Laser;
Second object lens are used for second laser focusing to the second dish, and receive the reflected light of second dish, and described second object lens can be moving by second disk center in the radial direction;
First object lens are used for first laser focusing to the first dish, and receive and the reflected light that guides first dish to first optical receiver, described first object lens depart from described radial direction and contiguous described second object lens configuration; And
The light path colligator is used for partly in conjunction with described first and second optical systems, to form in conjunction with light path; With
Optical path separator, be used for described separate arrive described first and second object lens in conjunction with light path before described in conjunction with light path.
5. optical disc apparatus according to claim 4, wherein second dish is being write down or playback duration, carry out tracking servo control by DPP method or three beam method, first dish is being write down or playback duration, carrying out tracking servo control by any one method in simple beam method, phase shift DPP method and the 5 luminous point DPP methods.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004274604 | 2004-09-22 | ||
| JP2004274604 | 2004-09-22 | ||
| JP2004322338 | 2004-11-05 |
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| CN1801356A CN1801356A (en) | 2006-07-12 |
| CN100397509C true CN100397509C (en) | 2008-06-25 |
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| CNB2005101249544A Expired - Fee Related CN100397509C (en) | 2004-09-22 | 2005-09-22 | Optical pickup and optical disk apparatus |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100903143B1 (en) * | 2006-07-21 | 2009-06-16 | 삼성전자주식회사 | Object lens and optical pick-up apparatus having the same |
| JP5069893B2 (en) * | 2006-10-18 | 2012-11-07 | 株式会社日立メディアエレクトロニクス | Optical pickup and optical disk drive |
| JP4357557B2 (en) | 2006-12-27 | 2009-11-04 | 株式会社東芝 | Optical head and optical disk apparatus |
| CN101632123B (en) * | 2007-03-16 | 2011-11-23 | 柯尼卡美能达精密光学株式会社 | Optical pickup device |
| CN101657853B (en) * | 2007-04-19 | 2011-09-14 | 柯尼卡美能达精密光学株式会社 | Optical pickup device and prism |
| JP5042782B2 (en) * | 2007-11-07 | 2012-10-03 | 株式会社日立メディアエレクトロニクス | Optical pickup device and optical disk device provided with the same |
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| US5892749A (en) * | 1996-02-06 | 1999-04-06 | Nec Corporation | Optical head device for reading two optical disks |
| CN2591708Y (en) * | 2002-09-19 | 2003-12-10 | 赵立人 | Blue light reading & writing composite optical head |
| US20040090901A1 (en) * | 2002-11-06 | 2004-05-13 | Nec Corporation | Optical head unit and optical information writing/reading device |
| CN1155944C (en) * | 1997-04-23 | 2004-06-30 | 日本胜利株式会社 | Optical disc apparatus |
| US20040165520A1 (en) * | 2003-02-26 | 2004-08-26 | Samsung Electronics Co., Ltd. | Compatible optical pickup |
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|---|---|---|---|---|
| US5892749A (en) * | 1996-02-06 | 1999-04-06 | Nec Corporation | Optical head device for reading two optical disks |
| CN1155944C (en) * | 1997-04-23 | 2004-06-30 | 日本胜利株式会社 | Optical disc apparatus |
| CN2591708Y (en) * | 2002-09-19 | 2003-12-10 | 赵立人 | Blue light reading & writing composite optical head |
| US20040090901A1 (en) * | 2002-11-06 | 2004-05-13 | Nec Corporation | Optical head unit and optical information writing/reading device |
| US20040165520A1 (en) * | 2003-02-26 | 2004-08-26 | Samsung Electronics Co., Ltd. | Compatible optical pickup |
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| CN1801356A (en) | 2006-07-12 |
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