CN1930619A - Optical head device and optical information device - Google Patents
Optical head device and optical information device Download PDFInfo
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- CN1930619A CN1930619A CNA2005800075327A CN200580007532A CN1930619A CN 1930619 A CN1930619 A CN 1930619A CN A2005800075327 A CNA2005800075327 A CN A2005800075327A CN 200580007532 A CN200580007532 A CN 200580007532A CN 1930619 A CN1930619 A CN 1930619A
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Abstract
An optical device is made compact with sufficient driving force of an object lens actuator achieved. An optical head device having a first optical system with a first objective lens that concentrates a light flux to an optical disk and having a second optical system with a second objective lens that has a low numerical aperture and concentrates a light flux to an optical disk. The second optical system irradiates the light flux on an optical disk having lower information recording density than a disk in the first optical system. In the optical device is provided an upward prism having a first reflection surface for bending, in the first optical system, the light flux into the direction of the optical axis of the first objective lens and having a second reflection surface for bending, in the second optical system, the light flux into the direction of the optical axis of the second objective lens.
Description
Technical field
The present invention relates to a kind ofly be the carrier regenerating information of representative with the CD or record the information in optical information in the carrier, and in optical information the optic probe device of regeneration or recorded information.
Background technology
Therefore digital versatile disc (Digital Versatile Disc) (DVD) can come digital-information recording with about 6 times recording density of compressed disc (CD), is known to the public as writing down the CD of large-capacity data.In recent years, be accompanied by the increase that should be recorded in the quantity of information in the CD, require to have more jumbo CD.Be to increase CD capacity, information is being recorded in the CD and during the information of regenerative recording in CD, is being necessary to improve recording of information density by dwindling the formed luminous point of the light that is radiated on the CD.For this reason, can be by for example the laser of light source being made as the short wavelength, and increase the numerical aperture (NA) of object lens, thus dwindle luminous point.In the record regenerating of DVD, using wavelength is 0.6 object lens as the light source of 660nm and numerical aperture (NA).In addition, can be 0.85 object lens as the blue laser of 405nm and NA also by using wavelength for example, make recording density reach 5 times of existing DVD recording density.
Yet, realize in the optical information of highdensity record regenerating possessing the function of exchanging with existing CD at the short wavelength laser that uses blue laser, can improve serviceability and value performance (cost performance) as device.At this moment, because when being difficult in numerical aperture with object lens and being increased to 0.85, and for example the object lens of using with DVD or CD increase running distance (interval in the space between object lens and the CD) like that, so, in can carrying out the exchange type optical information of highdensity record regenerating, preferably purchase at least one object lens and the object lens that are used for high density recording that have than its higher numerical aperture of record regenerating CD or the required use of DVD more in addition.
On the other hand, be used for the actuator for objective lenses of optical information, include the magnetic circuit that can drive along the both direction that focuses on and follow the trail of, the effect that this magnetic circuit played is, both made distance maintaining between CD and the object lens at certain interval, and made object lens move to desirable orbital position following the trail of direction again in focus direction.But, as mentioned above, in the optical information that alternately adopts the different a plurality of CDs of recording density, owing to need have the object lens corresponding respectively with a plurality of CDs of different recording densitys, thereby, actuator for objective lenses must be equipped on movable portion with a plurality of object lens, and it can be moved along focusing on and follow the trail of direction.
As a kind of in order to realize carrying out the exchange type optical information of record regenerating to the different a plurality of CDs of recording density, and at movable optic probe device that carries a plurality of object lens, for known to the public just like patent documentation 1 (Jap.P. open communique spy open 2002-208173 number) disclosed a kind of device (the 1st prior art).
Figure 17 is the structural representation of the optic probe device of the 1st prior art.In this optic probe device, to be transformed into almost parallel light by collimation lens (collimator lens) 62 from the 1st light source (not shown) emitted light beams 61, and optical axis be turned back to the direction perpendicular to the CD 65 of high record density by flat deflecting mirror (deflecting mirror) 63.Object lens 64 make light beam 61 optically focused on the record surface of CD 65.In addition, also will be transformed into almost parallel light by collimation lens 67, and optical axis be turned back to the direction perpendicular to the CD 70 that hangs down recording density by flat deflecting mirror 68 from the 2nd light source (not shown) emitted light beams 66.Object lens 69 make light beam 66 optically focused on the record surface of CD 70.
Objective lens device (actuator for objective lenses) 71 can be along the focus direction F perpendicular to the record surface of the CD 65 of high record density, and the both direction of the tracking direction T of CD 65 moves the 1st object lens 64.In addition, objective lens device (actuator for objective lenses) 72 can be along the focus direction F perpendicular to the record surface of the CD 70 of low recording density, and the both direction of the tracking direction T of CD 70 moves the 2nd object lens 69.
And object lens 64,69 are individually fixed on the appointed positions of actuator for objective lenses 71,72.
In addition, on an actuator for objective lenses, carry the optic probe device of 2 object lens, for example also be disclosed in the patent documentation 2 (Jap.P. open communique spy open flat 11-120587 number) and patent documentation 3 (Jap.P. open communique spy open 2002-245650 number) (the 2nd and the 3rd prior art).
Summary of the invention
Yet, in above-mentioned the 1st prior art, owing to be equipped with 2 actuator for objective lenses, thus can't dwindle the interval between the object lens 64,69, thereby have a kind of problem that hinders the miniaturization of optic probe device.If avoid this problem, and dwindle actuator for objective lenses 71,72, then can produce a kind of insufficient space that coil or magnet are installed movable one side in order to obtain driving force again, thereby can't obtain the problem of enough driving forces.
In addition, in the 2nd prior art, be injected into the optical axis of a side object lens, extend to object lens along straight line from light source.Therefore, the problem that exists an optic probe device can become very thick perpendicular to the thickness of the direction of cd side.
In addition, in the 2nd prior art, be on an actuator for objective lenses, to carry 2 object lens, even this technology and the 1st prior art is combined, yet can go wrong.That is, identical with device shown in Figure 17, in the 2nd prior art,, need the space of end 63a, 68a for deflecting mirror 63 and deflecting mirror 68 are set respectively, and need be with object lens 64 and object lens 69 separate configuration.And then, for preventing that thickness needs 1mm at least, and the amplitude of the space requirement You mm between end 63a, the 68a because of 63,68 distortions of two deflecting mirrors produce aberration.So, be necessary that separately 1.4mm or the interval more than the 1.4mm are configured with object lens 64 and object lens 69.In addition, when being configured on same actuator for objective lenses, the volume that is used for supporting the lens carrier of 2 object lens can increase, and weight can increase.Its result can produce a kind of problem that can't obtain enough driving forces.
In order to address the above problem, a kind of optic probe device provided by the present invention, it comprises: have the 1st optical system that makes 1st object lens of beam condenser on CD, have and make beam condenser be lower than on the CD of above-mentioned the 1st optical system in its information recording density, and its numerical aperture is lower than the 2nd optical system of the 2nd object lens of above-mentioned the 1st object lens, biasing element with the 1st reflecting surface and the 2nd reflecting surface, wherein said the 1st reflecting surface is turned back light beam to the optical axis direction of above-mentioned the 1st object lens in above-mentioned the 1st optical system, and described the 2nd reflecting surface is turned back light beam to the optical axis direction of above-mentioned the 2nd object lens in above-mentioned the 2nd optical system.
According to this structure of the present invention, both can be used for to the different a plurality of CDs of recording density regenerate or a plurality of object lens of writing down mutually near and be configured, these a plurality of object lens can be carried on an actuator for objective lenses again.
Therefore, can to carry out the exchange type optical information of record regenerating to the different a plurality of CDs of recording density in order realizing, and to carry in the optic probe device of a plurality of object lens, can both realize the stable focus control performance the CD that any recording density is arranged.
Annotate: the technical characterictic and the effect that do not have to record and narrate " optical information " in the summary of the invention.
In addition, do not have corresponding independent claims 29～33 described every inventions here yet and record and narrate its technical characterictic and effect, and, be not written in the title of invention yet.
Description of drawings
Fig. 1 is the stereographic map of major part of roughly representing the optic probe device of the embodiment of the invention 1.
Fig. 2 is the summary side elevation of above-mentioned optic probe device.
Fig. 3 is a stereographic map of representing the structure of actuator for objective lenses set in the above-mentioned optic probe device.
Fig. 4 is the exploded perspective view of the structure of the above-mentioned actuator for objective lenses of expression.
Fig. 5 is the circuit diagram of the control circuit of above-mentioned actuator for objective lenses, the state when expression is carried out record regenerating to low density optical disc.
Fig. 6 is the performance plot of the displacement frequency response characteristics of 1st object lens of expression when low density optical disc carried out record regenerating.
Fig. 7 is the performance plot of the displacement frequency response characteristics of 2nd object lens of expression when low density optical disc carried out record regenerating.
Fig. 8 is the synoptic diagram that is equivalent to Fig. 5 of the state of expression when high density compact disc carried out record regenerating.
Fig. 9 is the performance plot of the displacement frequency response characteristics of 1st object lens of expression when high density compact disc carried out record regenerating.
Figure 10 is the performance plot of the displacement frequency response characteristics of 2nd object lens of expression when high density compact disc carried out record regenerating.
Figure 11 is a stereographic map of representing the structure of actuator for objective lenses in the past.
Figure 12 is the generalized schematic of structure of the optical information of the embodiment of the invention 2.
Figure 13 is the stereographic map of structure of roughly representing the computing machine of the embodiment of the invention 3.
Figure 14 is the stereographic map of structure of roughly representing the optical disc reproducing device of the embodiment of the invention 4.
Figure 15 is the stereographic map of structure of roughly representing the optical disc recorder of the embodiment of the invention 5.
Figure 16 is the stereographic map of structure of roughly representing the optical disc server of the embodiment of the invention 6.
Figure 17 is a side view of roughly representing optic probe device in the past.
Embodiment
Followingly embodiments of the present invention are described with reference to accompanying drawing.
(embodiment 1)
Fig. 1 is the stereographic map at the main position of the optic probe device in the embodiment of the invention 1, Fig. 2 is the summary side elevation of the optic probe device in the embodiment of the invention 1, Fig. 3 is the stereographic map of the structure of the actuator for objective lenses in the expression embodiment of the invention 1, and Fig. 4 is the exploded perspective view of the structure of the actuator for objective lenses in the expression embodiment of the invention 1.
In Fig. 1～Fig. 3, T represents to follow the trail of direction (T direction), and F represents focus direction (F direction), and Y represents the tangential direction (Y direction) of CD.Above-mentioned tracking direction is the direction that is approximately perpendicular to the optical axis of object lens 34,41, and the rail groove tangential direction of CD 32,35,46 is the direction of approximate vertical relatively.That is, refer to direction among Fig. 2 perpendicular to paper.Above-mentioned focus direction is the direction that is roughly parallel to the optical axis of object lens 34,41.Above-mentioned tangential direction is the direction of tangent line of the rail groove that is roughly parallel to CD 32,35,36 (with reference to Fig. 2).
This optic probe device comprises the 1st optical system 21 and the 2nd optical system 22.In the 1st optical system 21, be provided with high density with object lens (the 1st object lens) 34, on the other hand, in the 2nd optical system 22, be provided with numerical aperture less than the low-density object lens (the 2nd object lens) 41 of high density with object lens.
The 1st optical system 21 is the optical systems that are used for shining the higher CD of information recording density 35.This 1st optical system 21 possesses the 1st light source 31, collimation lens 33 and the 1st object lens 34 at least.On the other hand, the 2nd optical system 22 is the optical systems that are used for shining the low CD 32,46 of CD that information recording density shines than the 1st optical system 35.This 2nd optical system 22 possesses the 2nd light source 37a, the 3rd light source 43a and collimation lens 39 and the 2nd object lens 41 at least.The 3rd light source 43 is used to shine the CD 32 that its information recording density shone than the light beam 58 that penetrates from the 2nd light source 37a (digital multi disc for example: CD 46 that DVD) will be low (compact disk for example: CD).That is, the light wavelength that penetrates by the order of the 3rd light source 43a, the 2nd light source 37a, the 1st light source 31 shortens successively.At this, in the instructions, " DVD " includes DVD-R, DVD-ROM, DVD-RAM, DVD-RW etc., and " CD " includes CD-R, CD-ROM, CD-RW etc.
In above-mentioned the 1st optical system 21 and the 2nd optical system 22, the common deviating prism (deflecting prism) 60 that uses as an example of biasing element (deflectingelement).This deviating prism 60 is to have inclined-plane (the 1st reflecting surface) 60a and inclined-plane (the 2nd reflecting surface) section of 60b is roughly the triangular prism of 3 dihedrals.Deviating prism 60, its inclined-plane 60a and the formed angle of inclined-plane 60b are 90 degree, and its section is roughly two equilateral triangles.The light beam 56 that 60a reflection in inclined-plane is penetrated from the 1st light source 31.60b reflection in inclined-plane is from the light beam 57,58 of the 2nd light source 37a and 43 ejaculations of the 3rd light source.
The short wavelength's who penetrates from above-mentioned the 1st light source (for example blue-light source) 31 light beam 56, its depth of parallelism is transformed by collimation lens 33, by the inclined-plane 60a of deviating prism 60 optical axis is turned back the direction perpendicular to the higher CD 35 of recording density again.The 1st object lens 34 make at inclined-plane 60a reflected beams 56 optically focused on the record surface of CD 35.Reflected beams on the record surface of CD 35, along the light path opposite with original light path, become and initial different direction by branch by polarized light beam splitter (polarizedlight beam splitter) 59 means such as branch such as grade (or branch element), detect by photodetector 36.Light beam is carried out light-to-current inversion by photodetector 36, and obtains to be used for obtaining the electric signal of information signal, servosignal (be used for the focus error signal of focus control, or be used for the trace signals of Tracing Control).
And deviating prism 60 also can be set as the summit of triangular section as what prism integral body was seen and cut the shape of having justified the crest line position.According to this structure, can prevent cutting (chipping) (shortcoming).In this manual, comprise this structure, be called section general triangular (substantial triangle).
Light beam 57 from above-mentioned the 2nd light source (for example red light source) 37a ejaculation, its parallel degree is transformed into for example almost parallel light by collimation lens 39, by the inclined-plane 60b of deviating prism optical axis is turned back the direction perpendicular to the lower CD 32 of recording density again.At this moment, light beam 57 roughly becomes parallel with the light beam 56 of being turned back at inclined-plane 60a.The 2nd object lens 41 make light beam 57 optically focused on the record surface of CD 32.By the record surface beam reflected of CD 32, along the light path opposite with original light path, become and initial different direction by branch by polarized light hologram (polarized light hologram) 40 means such as branch such as grade (or branch element), carry out light-to-current inversion by not shown photodetector, and acquisition is used for obtaining the electric signal of information signal, servosignal (be used for the focus error signal of focus control, or be used for the trace signals of Tracing Control).Photodetector can be installed in for example inside of gathering unit 37 of light source and photodetector.Like this, just can realize miniaturization, the slimming of optic probe device, and guarantee its security.
When the CD 46 that its recording density is lower than above-mentioned 2 kinds of CDs 35,32 is regenerated or write down, use the 3rd light source (for example red light source) 43a.From the light beam 58 that above-mentioned the 3rd light source 43a penetrates, its parallel degree is by collimation lens 39 and to for example almost parallel light conversion, by the inclined-plane 60b of deviating prism optical axis turned back the direction perpendicular to CD 46 again.Object lens 41, with light beam 58 optically focused on the record surface of CD 46.Reflected beams on the record surface of CD 46, along the light path opposite with original light path, by holograph 43 means such as branch such as grade (or branch element) be and initial different direction by branch, carry out light-to-current inversion by not shown photodetector, and obtain the electric signal that is used for obtaining information signal, servosignal (be used for the focus error signal of focus control, or be used for the trace signals of Tracing Control).Photodetector for example can be installed in, and light harvesting source and photodetector are the inside of the unit 43 of one.Like this, just can realize miniaturization, the slimming of optic probe device, and guarantee its security.
In addition, in the above description, the branch means have exemplified the device that has nothing in common with each other respectively, but can use wherein any.
Two object lens 34,41 are fixed in respectively on the appointed positions of actuator for objective lenses 45.Detailed structure about actuator for objective lenses 45 will be narrated in the back.
Two object lens 34,41 are to be arranged as good in above-mentioned Y direction.If in vertical therewith direction, be that the radial direction of CD is arranged, then when the interior week of object lens 34,41 visit CDs of one of them or during most peripheral, another 41,34 on object lens that do not have to use might clash into the inboard motor that is used for rotating disc, or interfere with the apparatus outside in the outside.Therefore, by two object lens 34,41 are arranged along the Y direction, optic probe device just can not collide and make motor that CD rotates etc., and object lens 34,41 are moved to the T direction as much as possible.
In the present embodiment, as mentioned above, the 1st optical system 21 and the 2nd optical system 22, using has common deviating prism 60.Promptly, deviating prism 60 is unitary element, and inclined-plane 60a, the 60b of the minor face of the triangular cross-section by forming deviating prism 60, the optical axis of the light beam 56 that penetrates from the 1st light source 31, reach from the optical axis of the light beam 57,58 of the 2nd light source 37a or the 3rd light source 43a ejaculation, turning back respectively becomes to be parallel to the optical axis of object lens 34,41.Therefore, there is no need as the 1st prior art, to enlarge optical axis at interval, the interval (interval between outer end and the outer end) between two object lens 34,41 can be located at 1mm or below the 1mm.Thereby can make the more miniaturization in the past of optic probe device ratio.And, can make the optic probe device attenuation, the weight saving of the movable portion of actuator for objective lenses, thus can obtain enough driving forces.
Be injected into the light beam 56 of deviating prism 60, and be injected into the light beam 57,58 of deviating prism 60, be parallel to each other to good with optical axis.And reflecting surface 60a and reflecting surface 60b preferably set Chengdu perpendicular to the be substantially triangular cross-section parallel with the paper of Fig. 2.Thus, can make just that light beam 56,57,58 in the directive object lens 34,41 is parallel to the optical axis of object lens 34,41 by reflecting surface 60a, 60b reflection.Like this, when reflecting surface 60a and reflecting surface 60b two sides are all set for when being substantially leg-of-mutton section, then can be roughly triangular shaped bar-like member by cutting off the section that extends to a side direction, make deviating prism 60, thereby can make deviating prism 60 effectively and with low cost.
The 2nd object lens 41 preferably are configured to the approximate centre of its optical axis by CD 32,46, and can move on the straight line that extends to the CD radial direction.That is, when optic probe device carries out seek operation, on above-mentioned straight line, move to good with the 2nd object lens.In the 2nd optical system 22, for example, form diffraction grating (diffraction grating) by a part, then can from light beam 58, form beamlet, and utilize this trace signals of carrying out 3 fluxs of light method to detect at the parts of hologram (hologram) 43b.Therefore, it is moved on above-mentioned straight line, then can carry out stable input by disposing the 2nd object lens 41.And, at this moment because the 1st object lens 34 pass through the approximate centre of CD 35, and depart from the straight line that extends along radial direction, therefore, be good to detect the tracking error signal by 1 flux of light method that does not use beamlet.
If as the 1st prior art, when using 2 deflecting mirrors (deflecting mirror), light beam is injected the angle of object lens, can adjust by the deflecting mirror that tilts separately, thus, can reduce because of light beam and inject the outer aberration of axle that object lens produce obliquely.Yet, in the present invention, owing in the 1st optical system 21 and the 2nd optical system 22, be that deflection mirror (that is, deviating prism) 60 is formed at one, so, in two optical systems, can't adjust angle individually.Therefore, preferably possess support 31a, be used for light source support 31,37a, 43a, make it can distinguish relative optics base station (omitting diagram) and slide along direction perpendicular to optical axis.If can carry out the position adjustment of light source 31,37a, 43a, even then under the state of having fixed deflection mirror 60 positions, the adjustment of each optical axis also is possible.And, by moving light source 31,37a, 43a, can also adjust the optical axis angle of the light that passes collimation lens 33,39 along direction perpendicular to optical axis.And above-mentioned optics base station is meant the framework that is used for fixing illustrated optical element etc.
As shown in Figures 1 and 2, when the 1st light source 31 is made of semiconductor laser etc., be the face of cylinder of projection so that light source one side to be set, its reverse side is that the lens 55 on the recessed face of cylinder are for good.By these lens 55 being arranged near the 1st light source 31, the wild picture of long sight of the light beam 56 that penetrates from the 1st light source 31 then approaches circle from ellipse, thereby can improve the utilization ratio of light.
In addition, as described in Figure 2, the diffactive lens 49 with convex lens effect can be arranged in the light path.By diffactive lens 49 being arranged between deviating prism 60 and the 1st object lens, the focal length because of the caused object lens 34 of variations in refractive index in the time of can being suppressed at wavelength shift changes.
In addition, also, can improve the light utilization ratio of polarising beam splitter 59 between deviating prism 60 and the 1st object lens by 1/4 wavelength plate 48 is set.
In addition, also, the lens 50 of diffraction element 51 or non-rotating symmetric form are set, can obtain servosignal by between photodetector 36 and polarized light beam splitter 59.
In addition, when the numerical aperture (NA) of the 1st object lens 34 more than or equal to 0.8 the time, because because of the thickness error of the stock of CD 35 causes that the spherical aberration change is bigger, so, preferably be provided with and be used for drive unit (omitting diagram) that collimation lens 33 is moved along optical axis direction.Like this, just can be to carrying out revisal because of the caused spherical aberration of the thickness error of stock, thus can stably carry out information regeneration or information record.
When constituting the 2nd light source 37a and the 3rd light source 43a respectively,, can improve from the light utilization ratio of the light beam of two light sources ejaculation by using dichronic mirror (dichroic mirror) 38.And, also, can omit dichronic mirror 38, thereby cut down component number by light source 37a and light source 43a are collected on the identical semi-conductor chip.In addition, also can omit the 2nd light source 37a or the 3rd light source 43a.
The 2nd object lens 41, as shown in Figure 2, it is thin to can be compared to the 1st object lens 34 most.That is, because big than the 2nd object lens 41 of the numerical aperture of the 1st object lens 34, so the running of the 1st object lens 34 is apart from shortening.Therefore, be necessary the 2nd object lens 41 are configured in than the position of the 1st object lens 34 further from CD, but, two object lens 34,41 then can be set make its centre of gravity place equally high if the 2nd object lens 41 are thinner.Its result can improve the weight balancing of actuator for objective lenses 45, thereby improves the accuracy of the object lens drive controlling of actuator 45.
Can also establish the diameter of the diameter of the 1st object lens 34 less than the 2nd object lens 41.That is, because of the 1st object lens 34 to the 2 object lens 41 are thick, so, if the diameter of the 1st object lens 34 is reduced, just can make the weight of two object lens 24,41 approaching, thereby can improve the weight balancing of actuator for objective lenses 45.Further, if the focal length of establishing the 1st object lens 34 is shorter than the focal length of the 2nd object lens 41, and during the effective diameter of cooperation object lens 34,41, then can further improve weight balancing.
Shown in present embodiment 1, the light beam if the inclined-plane 60a of deviating prism 60 and inclined-plane 60b turn back, make the light beam that is injected into inclined-plane 60a from above-mentioned the 1st light source 31, with the light beam that is injected into inclined-plane 60b from above-mentioned the 2nd light source 37a or the 3rd light source 43a, reverse direction and being parallel to each other each other mutually, and the light that penetrates from each inclined-plane 60a, 60b becomes almost parallel, then can effectively utilize the space in the optic probe device.And, owing to can make deviating prism 60 by cutting off bar-like member, so, cost of manufacture can be reduced.
Further, in present embodiment 1, owing to be provided with the light beam that penetrates and be injected into deviating prism (biasing element) 60 from the 1st light source 31 is turned back polarized light beam splitter (the 1st branch element) 59 with the direction of CD almost parallel, and will turn back dichronic mirror (the 2nd branch element) 38 with the direction of CD almost parallel from the light beam that the 2nd light source 37a penetrated and be injected into deviating prism 60, so, can prevent that by the light beam of turning back the amplitude (amplitude of Y direction among Fig. 2) of optic probe device from increasing.And polarized light beam splitter 59 and dichronic mirror 38 are because also to the side surface direction light beam of turning back, so the space that can effectively utilize actuator for objective lenses 45 belows forms light path.
In addition, in the 1st optical system 21 of present embodiment 1, also polarized light beam splitter 59 disposes photodetector 36 in the opposite of the 1st light source 31 side relatively, polarized light beam splitter 59 has to be made from the light beam of the 1st light source the 1st reflecting surface 59a to deviating prism 60 reflections, and makes from the light beam of deviating prism 60 the 2nd reflecting surface 59b to photodetector 36 reflections.That is, polarized light beam splitter 59, at mutual reverse direction with about right angle light beam of turning back.Therefore, owing to, be configured in opposition side across polarized light beam splitter 59, thereby can suppress the maximization of optic probe device with the 1st light source 31 and photodetector 36.And, even produce the temperature variation etc. of polarized light beam splitter 59, also since the 1st reflecting surface 59a move with equidirectional with the 2nd reflecting surface 59b, so, the picture that is detected by photodetector 36 is stablized.Thereby can improve light and detect degree of accuracy.
At this, actuator for objective lenses 45 is described.In the actuator for objective lenses 45 of present embodiment 1, in focus control to object lens 34,41, the displacement phase of object lens 34,41 of setting one of them is slower than the displacement phase of another object lens 41,34, and on the other hand, be provided with when this another object lens 41,34 are carried out focus control, at the phase place propulsion plant of designated frequency range forward displacement phase place.Below, specifically describe actuator for objective lenses 45 and have reason as above-mentioned structure.
At first, to as the cited patent documentation 3 disclosed structures of above-mentioned the 3rd prior art, describe with reference to Figure 11.
Actuator for objective lenses 112 shown in Figure 11, in focus direction (F direction) perpendicular to CD (omitting diagram) record surface, and two directions of the tracking direction (T direction) of CD, drive the 2nd object lens 116 and the 1st object lens 117.The F direction is the optical axis direction of object lens 116,117.And object lens 116,117 are fixed in respectively on the appointed positions of lens carrier 114.In addition, in the following description example, the 2nd object lens 116 are applicable to CD, and the 1st object lens 117 are applicable to DVD.
6 line 118a～118f are fixed in line platform (wire base) 119, and line platform 119 then is fixed on the actuator base 120.
Be fixed with on the lens carrier 114 and follow the trail of drive coil 112a, 112b, with focusing drive coil 123a, 123b, 123c, 123d.
On lens carrier 114, support in 2 object lens 116,117 of (holding), the wavelength of the laser beam of the 2nd object lens of using by CD 116, wavelength than the laser beam of the 1st object lens of using by DVD 117 is long, and the NA of the 2nd object lens 116 is less than the NA of the 1st object lens 117.
Promptly, the 2nd object lens 116 and the 1st object lens 117, the direction of being extended along line 118a～118f on lens carrier 114 is provided with, and the position that relative line 118a～118f is connected with lens carrier 114, the 2nd less object lens 116 of first end one side configuration NA of online 118a～118f, and at the 1st bigger object lens 117 of base end part one side configuration NA.
In lens carrier 114, according to the focus error signal of being exported from the photodetector (photo detector) that is used for detection of focus error (omitting diagram) and pairing focus error detection circuit (omitting diagram) (FE signal), focus on drive coil 123a, 123b, 123c, 123d by allowing electric current flow into the 1st～the 4th respectively, make to produce long-range navigation thatch power (Lorentz force), then can on the F direction, control object lens 116,117 at equidirectional.Thus, laser beam can be focused on the CD D.
In addition, in lens carrier 114, also according to tilt signals from tilt detection circuit (omitting diagram), by allowing electric current flow into the 1st and the 3rd focusing coil 123a, 123c and the 2nd and the 4th focusing coil 123b, 123d respectively, make to produce rightabout power, then can control object lens 116,117 and rotate around Y-axis.Promptly, actuator for objective lenses 112 in the past possesses by actuator base the 120, the 1st～the 4th permanent magnet 121a, 121b, 121c, 121d, and each focuses on the tilt drive mechanism around the rotation direction of Y-axis of drive coil 123a, 123b, 123c, 123d defined.
And, in the lens carrier 114, also according to the tracking error signal of being exported from the photodetector that is used to detect tracking error (omitting diagram) and pairing tracking error testing circuit (omitting diagram) (TE signal), by allowing electric current flow into tracking coil 122a, 122b respectively, make to produce long-range navigation thatch power, then can control desirable track or pit row (pit line) on the laser beam point tracking CD at equidirectional.
Yet, in actuator for objective lenses 112 with above-mentioned structure in the past, the 1st object lens 117 that the 2nd object lens 116 that CD uses and DVD use, the Y direction of being extended along line 118a～118f on lens carrier 114 is provided with, and, the position that relative line 118a～118f is connected with lens carrier 114, the 2nd less object lens 116 of first end one side configuration NA of online 118a～118f, and at the 1st bigger object lens 117 of base portion one side configuration NA.
(among the 1kHz～3kHz), be mostly on controlling Design, specially to set gain cross-over, when phase place becomes when negative, can occur to guarantee that enough phase places are abundant and make the vibrative situation of focus control producing the frequency field of above-mentioned vibration resonance.
Therefore, in actuator for objective lenses 112 in the past, the CD of the recording density of having used one of any object lens in the 2nd object lens 116 of Y direction setting and the 1st object lens 117 is carried out record regenerating, unstable situation about maybe can't carry out can occur.
So, in the actuator for objective lenses of present embodiment, in order to realize to carry out the different a plurality of CDs of recording density the exchange type optical information of record regenerating, and in the actuator for objective lenses that a plurality of object lens is carried on movable, can both guarantee the control performance that it is stable to CD arbitrarily.
At this,, the concrete structure of the actuator for objective lenses 45 of present embodiment 1 is described with reference to Fig. 3 and Fig. 4.In Fig. 3 and Fig. 4, F represents focus direction (F direction), and T represents to follow the trail of direction (T direction), and Y represents the tangential direction (Y direction) of CD, and R represents the vergence direction of conduct around the rotation direction of Y-axis.F direction, T direction and Y direction are equivalent to the direction of each coordinate axis of 3 dimensions in the vertical coordinates.
Actuator for objective lenses 45 comprises the lens carrier 3 that is formed by resin.In this lens carrier 3, be equipped with the 1st object lens (high density object lens) the 34 and the 2nd object lens (low-density object lens) 41.The 2nd object lens 41 are used for the CD of low recording densitys such as CD, DVD, and the 1st object lens 34 are used for the information recording density CD higher than the CD of low recording density.
On lens carrier 3, in 2 sides of Y direction the 1st printed coil 4 and the 2nd printed coil 5 are installed, and also are separately installed with terminal strip 8 in 2 sides of T direction.And movable body includes the 2nd object lens the 41, the 1st object lens 34, lens carrier the 3, the 2nd printed coil the 4, the 1st printed coil 5 and terminal strip 8.
The 2nd printed coil 4 and the 1st printed coil 5 are the printed coils that formed loop construction on every side with vortex shape stickup conductive material that are parallel to the axle of Y direction respectively on printed-wiring board (PWB).The 2nd printed coil 4 comprises along the 2nd 4a of focusing coil portion and the 2nd 4b of tracking coil portion of the configuration of T direction.In addition, the 1st printed coil 5 comprises along the 1st 5a of focusing coil portion and the 1st 5b of tracking coil portion of the configuration of T direction.
The position of the 2nd 4a of focusing coil portion and the 1st 5a of focusing coil portion relation is to comprise the Y direction and to be the center perpendicular to the plane of T direction, only to have departed from the position relation of same distance mutually round about, and be the position relation that is separated from each other on the Y direction.In addition, the position of the 2nd 4b of tracking coil portion and the 1st 5b of tracking coil portion relation is also identical.Therefore, the 2nd printed coil 4 and the 1st printed coil 5 can use same parts, as long as just and be installed on the position of rotation-symmetric can.
The two-terminal of the two-terminal of the 2nd 4a of focusing coil portion and the 2nd 5a of focusing coil portion, difference is passed through terminal strip 8 and line 9 independently and is connected with 17 wiring of the 1st driver.In addition, the 2nd 4b of tracking coil portion is connected with the mutual series wiring of the 1st tracking coil 5b, and is connected with 17 wiring of the 1st driver by terminal strip 8 and line 9.
The 1st magnet 7 and the 2nd magnet 6 are all magnetized by heteropole in two lines with F direction and T direction are 4 zones on border.
The 1st magnet 7 is disposed facing to the 1st printed coil 5, is fixed on the 1st york piece (yoke) 10a.And the 1st magnet 7 is configured to make the center line 5c of focusing coil 5a of the boundary line of its magnetic pole and the 1st printed coil 5 and the center line 5d of the 5b of tracking coil portion to agree.
The 2nd magnet 6 is disposed facing to the 2nd printed coil 4, is fixed on the 2nd york piece 10b.And the 2nd magnet 6 is configured to make the center line 4c of the 4a of focusing coil portion of the boundary line of its magnetic pole and the 2nd printed coil 4 and the center line 4d of the 4b of tracking coil portion to agree.
Material, shape, magnetization pattern and the magnetization of the 1st magnet 7 and the 2nd magnet 6 are all identical.Therefore, the magnetic field that produced of the 1st magnet 7 and the 2nd magnet 6 is roughly the same.
26 terminals that terminal added up to of 2 terminals of 2 terminals of the 2nd 4a of focusing coil portion, the 1st 5a of focusing coil portion and the tracking coil 4b that is connected in series, tracking coil 5b, by terminal strip 8 by in succession in the first end of 6 lines 9 side.The base end part of this line 9 then is fixed on the substrate (printed-wiring board (PWB)) 13 by supporting bracket (susholder) 12.In addition, york piece 10a, 10b, supporting bracket 12, substrate (printed-wiring board (PWB)) 13 are fixed on the base 11.Line 9 can be made of elastic metallic materials such as beryllium copper or phosphor-coppers, and form have circle, the roughly thread like body or the clava of polygon, oval equal section shape.In addition, the centre of support of line 9 also is configured to consistent substantially with the center of gravity of movable body.
The 2nd object lens 41 and the 1st object lens 34 are arranged on the lens carrier 3 along the Y direction.And the 2nd object lens 41 are configured in base end part one side of leaning on line 9 from the centre of support of line 9, and the 1st object lens 34 are configured in first end one side of leaning on line 9 from the centre of support of line 9 simultaneously.
In addition, the 2nd printed coil 4 and the 2nd magnet 6 are configured online 9 base end part one side, and the 1st printed coil 5 and the 1st magnet 7 are configured online 9 first end one side.That is,, dispose the 2nd printed coil 4 and the 2nd magnet 6 in the 2nd object lens 41 1 sides, and dispose the 1st printed coil 5 and the 1st magnet 7 in the 1st object lens 34 1 sides along the Y direction.
This actuator for objective lenses 45, the displacement phase that is configured to the focus direction of the 2nd object lens 41 lags behind the displacement phase of the focus direction of the 1st object lens 34.If bright specifically, the space amplitude between the 2nd printed coil 4 and the 2nd magnet 6 is configured to bigger than the space amplitude between the 1st printed coil 5 and the 1st magnet 7 exactly.Therefore, when switching on the same electrical flow valuve among the 1st 5a of focusing coil portion and the 2nd 4a of focusing coil portion, it is big that the focusing driving force that is produced among the 1st 5a of focusing coil portion becomes, and the phase propetry under the vibration resonance frequency of the 1st object lens 34 changes to positive dirction always.On the contrary, the phase propetry under the vibration resonance frequency of the 2nd object lens 41 changes to negative direction always.Its result, the phase place of the 2nd object lens 41 is than the phase lag of the 1st object lens 34.
Among Fig. 5, symbol 14 expression phase compensating circuits.This phase compensating circuit 14 is to the focus error signal FE from the distance error of focused detector (omit diagram) output, expression CD and object lens 34,41, near the circuit that gain cross-over, carries out phase compensation, and its output is branched into 2.The output of one of them is connected with the 2nd 4a of focusing coil portion wiring with the 1st driver 17 with signal amplification function by switch 16.Above-mentioned switch can switch the circuitous path that advances the path of wave filter 15 and this wave filter 15 that makes a circulation by the part phase place as an example that advances phase unit.The part phase place advances wave filter 15, is combination Hi-pass filter and low-pass filter, only advances the wave filter of the phase place of drive signal with the vibration resonance frequency.The opposing party of above-mentioned output then is connected with the 1st 5a of focusing coil portion wiring by the 2nd driver 18 with the direct amplification function of signal.
Actuator for objective lenses with said structure, its running is as described below.
At first, because the space between the 2nd printed coil 4 and the 2nd magnet 6 is configured to greater than the space between the 1st printed coil 5 and the 1st magnet 7, so, in the amount of the interlinkage flux (interlinkage flux) of the 2nd 4a of focusing coil portion less than amount at the interlinkage flux of the 1st 5a of focusing coil portion.Therefore, when the 2nd 4a of focusing coil portion and the 1st 5a of focusing coil portion switched on the same electrical flow valuve, it is big that the focusing driving force that is produced among the 1st 5a of focusing coil portion becomes.So the phase place under the frequency that makes the 1st object lens 34 generation vibration resonances changes to positive dirction always.Relative therewith, the phase place under the frequency that makes the 2nd object lens 41 generation vibration resonances if do not advance wave filter 15 by the part phase place, then changes to negative direction.Thereby when carrying out the record regenerating of low density optical discs such as CD, DVD, as shown in Figure 5, change-over switch 16 makes the output of phase compensating circuit 14 be connected in the path that advances wave filter 15 by the part phase place.Like this, only in the 2nd 4a of focusing coil portion, add phase place and gain, the drive signal phase place that makes the 2nd object lens 41 gives revisal only advanced wave filter 15 to produce the frequency range of vibration resonance by phase place to positive dirction.
Therefore, when carrying out the record regenerating of low density optical disc, the displacement frequency response characteristics of the 1st object lens 34, as shown in Figure 6, phase place under the frequency that produces vibration resonance changes to negative direction, on the other hand, and the displacement frequency response characteristics of the 2nd object lens 41, as shown in Figure 7, the phase place of the drive signal under the frequency that produces vibration resonance changes to positive dirction.So, can in the focus direction displacement of the 2nd object lens 41, guarantee to have enough phase places abundant, thereby can make the focus control of the 2nd object lens 41 not take place to vibrate and stably carried out.
On the other hand, when carrying out the record regenerating of high density compact disc, as shown in Figure 8, change-over switch 16 makes the output of phase compensating circuit 14 be connected in the circuitous path that does not advance wave filter 15 by the part phase place.Like this, the part phase place advances 15 in wave filter not bring into play its effect, and the displacement frequency response characteristics of the 1st object lens 34 and the 2nd object lens 41 is respectively as Fig. 9 and shown in Figure 10.That is, change to positive dirction owing to produce the phase place of the drive signal under the frequency of vibration resonances at the 1st object lens 34, thereby, can guarantee that enough phase places are abundant, thereby can make the focus control of the 1st object lens 34 that vibration does not take place and stably carried out.And this moment, the phase place under the frequency that produces vibration resonance changed to negative direction in the 2nd object lens 41.
As mentioned above, in present embodiment 1, actuator for objective lenses 45 is configured to make the 2nd object lens 41 to lag behind to the phase place of the drive signal of focus direction displacement and makes the phase place of the 1st object lens 34 to the drive signal of focus direction displacement, and be provided with when carrying out the focus control of the 2nd object lens 41, with the phase place of the 2nd object lens 41 to the drive signal of focus direction displacement, the part phase place of more pushing ahead to the phase place of the drive signal of focus direction displacement than the 1st object lens 34 advances wave filter (example of phase place propulsion unit) 15 in the specified frequency scope.Thus, when carrying out the record regenerating of high density compact disc, owing to lag behind the displacement phase of the focus direction of the 1st object lens 34 at the displacement phase of the focus direction of the 2nd object lens 41 of the frequency range that produces vibration resonance, so, can guarantee that in the focus control of the 1st object lens 34 enough phase places are abundant, thereby can carry out stable control high density compact disc.And, when carrying out the record regenerating of low density optical disc, by advancing to positive dirction energetically in the phase place of the 2nd object lens drive signal that advances wave filter 15 to produce the frequency range of vibration resonance by the part phase place, can guarantee that then enough phase places are abundant, thereby can stably carry out the focus control of the 2nd object lens 41 low density optical disc.
As the above explanation of carrying out, in the frequency range that produces vibration resonance is the scope of 1kHz～3kHz, even in phase place when negative direction changes, also can pass through to positive dirction revisal phase propetry by the phase place propulsion unit, guarantee that enough phase places are abundant, thereby vibration can not take place and carry out focus control stably.Thus, carrying out the exchange type optical information of record regenerating and carried in the actuator for objective lenses 45 of a plurality of object lens 34,41 the different a plurality of CDs of recording density, can both realize the stable focus control performance to the CD of any recording density at movable body in order to realize.
In addition, in present embodiment 1, the 2nd object lens 41 are configured on the straight line of the radial direction by cd centre, base end part one side across this straight line online 9 disposes the 2nd printed coil the 4, the 2nd magnet the 6, the 2nd york piece 10b, supporting bracket 12, reaches substrate 13, and formerly end one side disposes the 1st object lens the 34, the 1st printed coil the 5, the 1st magnet 7 and the 1st york piece 10a.Its result, the above-mentioned relatively straight line of actuator for objective lenses 45 is in the approaching symmetry of the size of the Y of both sides direction, and its balance also improves.In addition, during the record regenerating of the CD in being concealed in tray salver, because the peristome of tray salver is the also symmetry substantially of straight line of the radial direction by cd centre relatively, therefore, space efficiency to the peristome of tray salver improves, thereby can guarantee enough spaces for magnetic circuit, lens carrier shape, make that realizing improving driving force, improving hardness is that high compartmentalization becomes possibility.
Because the 2nd 4a of focusing coil portion and the 1st 5a of focusing coil portion are driven respectively, and be configured in the position relation of the 2nd 4a of focusing coil portion and the 1st 5a of focusing coil portion, be to be the center perpendicular to the plane of following the trail of the T direction to comprise the Y direction, the position of only departing from same distance to mutual reverse direction, and along on the separated position of Y direction, so, also can drive at vergence direction (R direction).At this, carry out for the bending that absorbs CD or the inclination of driver instrument device or the initial stage comet aberration of optical head to the driving of R direction, because frequency range is at 100Hz or below the 100Hz, so, can not advance wave filter 15 to bring harmful effect to the part phase place of bringing into play its function in the scope of vibration resonance frequency.
And, in the present embodiment, in order to make the 2nd object lens 41 lag behind the displacement phase of the 1st object lens 34 in focus direction at the displacement phase of focus direction, be that the gap between the 2nd printed coil 4 and the 2nd magnet 6 is set for greater than the gap between the 1st printed coil 5 and the 1st magnet 7, but be not limited thereto.For example, also the center of gravity of movable body can be set in along the position of Y direction near the 2nd object lens 41, promptly near on the position of the 2nd 4a of focusing coil portion, or make the 2nd magnet 6 to the 1 magnets 7 thin, or constitute the 2nd magnet 6, or make the magnetic field that is produced also littler than the 1st magnet 7 by weakening magnetization etc. by the lower material of residual magnetic flux density.
In addition, different with present embodiment, also can be both to advance wave filter 15 with switch 16 and as the part phase place of phase place propulsion unit, be connected in the 1st focusing coil 5a, the displacement phase of setting the focus direction of the 1st object lens 34 again lags behind the displacement phase of the focus direction of the 2nd object lens 41.For example can list as this setting, set space between the 1st printed coil 5 and the 1st magnet 7 greater than the space between the 2nd printed coil 4 and the 2nd magnet 6; Or the center of gravity of setting movable body is on the close position of the 1st object lens 34 along the Y direction, promptly near on the position of the 1st 5a of focusing coil portion; Or the thickness of setting the 1st magnet 7 thin than the 2nd magnet 6; Setting constitutes the 1st magnet 7 by the lower material of residual magnetic flux density; Setting by weaken magnetization etc. make the magnetic field that produces littler etc. than the 2nd magnet 6.
(embodiment 2)
Figure 12 is the generalized schematic of the optical information 167 of the embodiment of the invention.In this optical information 167, be provided with represented optic probe device 155 as embodiment 1.Among Figure 12, CD 35 (or 32,46, below identical) is equipped on the rotating disk 162, and be clamped in and anchor clamps (clamper) 163 between, rotated by motor 164.Optic probe device 155, the drive unit 151 by optic probe device is shifted into the position of the track that desired information exists in the above-mentioned CD 35.
And above-mentioned optic probe device 155 for the position relation of adaptation with above-mentioned CD 35, sends to focus error signal or tracking error signal in the circuit 153.This circuit 153 sends the signal that makes the object lens fine motion corresponding to above-mentioned signal to above-mentioned optic probe device 155.According to this signal, 155 pairs of above-mentioned CDs of above-mentioned optic probe device carry out focus control and Tracing Control, and carry out the reading or writing of information (record) or deletion by above-mentioned optic probe device 155.
In the optical information 167 of present embodiment, owing to used the optic probe device of the foregoing description 1, so, have by an optic probe device, promptly can adapt to the effect of the different a plurality of CDs of recording density.
(embodiment 3)
Figure 13 is the schematic appearance that has possessed the computing machine 100 of the illustrated optical information 167 of embodiment 2.
(embodiment 4)
Figure 14 is the synoptic diagram that has possessed the optical disc reproducing device 121 of the optical information 167 that embodiment 2 recorded and narrated.
Optical disc reproducing device 121 possesses above-mentioned optical information 167, will be transformed into the converting means from information to the image (for example demoder) 66 of image from the information signal that above-mentioned optical information 167 obtains.In addition, this structure also can be used as Vehicular navigation system (car navigation) and obtains utilizing.In addition, can also comprise display device such as LCD.
(embodiment 5)
Figure 15 is the synoptic diagram that has possessed the optical disc recorder 140 of the optical information 167 that embodiment 2 recorded and narrated.
(embodiment 6)
Figure 16 is the synoptic diagram that has possessed the information server (optical disc server) 130 of the optical information 167 that embodiment 2 recorded and narrated.Input and output terminal 69 is or obtains the information that optical information 167 is write down that perhaps the information that optical information 167 is read exports outside wired or wireless input and output terminal to.Thus, can carry out message exchange with for example a plurality of apparatuses such as computing machine, phone, TV tuner, and can be used as the common information server of these a plurality of apparatuses (optical disc server) and use by network 135.Different types of CD owing to can stably write down or regenerate, so, the effect that can be used in extensive use had.
And, can also comprise the output unit 61 such as kinescope, liquid crystal indicator, printer of display message.In addition, also, can obtain to write down, storing the effect of more information by possessing the converter 131 that takes out a plurality of CDs of packing into from massaging device.
Possessed the optical information of the above embodiments or adopted computing machine, optical disc reproducing device, optical disc recorder, optical disc server, the Vehicular navigation system of above-mentioned record regeneration method, different types of CD owing to can stably write down or regenerate, so, have the effect that can be used in extensive use.
And, in the foregoing description 3～6, illustrated output unit 61 or LCD 120 by Figure 13～Figure 16, but also can be not possess output unit 61 or LCD 120, and to possess the embodiment that lead-out terminal replaces.In addition, do not illustrate input media among Figure 14 and Figure 15, but can be the embodiment that possesses output units such as keyboard, touch pad, mouse, telechiric device yet.On the contrary, in the foregoing description 3～6, can also be not possess input media and the embodiment that only has input terminal.
Utilize possibility on the industry
Optic probe device involved in the present invention is as recording the different a plurality of CDs of packing density for realizing again The interchanged type optical information of giving birth to and carry the optic probe device of a plurality of object lens, optical information, with and application system be very Useful.
Claims (33)
1. optic probe device is characterized in that comprising:
The 1st optical system has and makes 1st object lens of beam condenser on CD;
The 2nd optical system has and makes beam condenser be lower than the 2nd object lens on the CD of above-mentioned the 1st optical system in its information recording density, and the numerical aperture of the 2nd object lens is lower than above-mentioned the 1st object lens;
Biasing element, have the 1st reflecting surface and the 2nd reflecting surface, described the 1st reflecting surface is turned back light beam to the optical axis direction of above-mentioned the 1st object lens in above-mentioned the 1st optical system, and described the 2nd reflecting surface is turned back light beam to the optical axis direction of above-mentioned the 2nd object lens in above-mentioned the 2nd optical system.
2. optic probe device according to claim 1 is characterized in that:
Above-mentioned the 1st optical system comprises the 1st light source;
Above-mentioned the 2nd optical system comprises the 2nd light source that penetrates the long light beam of above-mentioned the 1st light source of wavelength ratio.
3. optic probe device according to claim 2 is characterized in that: above-mentioned the 2nd optical system also comprises the 3rd light source that penetrates the long light beam of above-mentioned the 2nd light source of wavelength ratio.
4. optic probe device according to claim 3, it is characterized in that: above-mentioned the 1st reflecting surface and above-mentioned the 2nd reflecting surface light beam of turning back, the feasible light beam that is injected into above-mentioned the 1st reflecting surface from above-mentioned the 1st light source, with the light beam that is injected into above-mentioned the 2nd reflecting surface from the 2nd light source or the 3rd light source, mutually each other when reverse direction and almost parallel, the light beam that penetrates from each reflecting surface becomes parallel substantially.
5. optic probe device according to claim 4 is characterized in that: above-mentioned biasing element is a triangular prism.
6. according to each described optic probe device in the claim 1 to 5, it is characterized in that: above-mentioned the 1st object lens and above-mentioned the 2nd object lens, arrange and disposed along the tangential direction of the track of CD.
7. optic probe device according to claim 6 is characterized in that:
Above-mentioned the 2nd object lens are configured on the straight line of the approximate centre by CD,
Above-mentioned the 1st object lens are configured on the position of departing from above-mentioned straight line.
8. according to each the described optic probe device in the claim 2 to 7, it is characterized in that: the light beam that penetrates from above-mentioned the 2nd light source is irradiated onto on the DVD.
9. according to each the described optic probe device in the claim 1 to 8, it is characterized in that: above-mentioned the 2nd object lens are thinner than above-mentioned the 1st object lens.
10. according to each the described optic probe device in the claim 1 to 9, it is characterized in that: above-mentioned the 1st object lens, its external diameter is littler than above-mentioned the 2nd object lens.
11. each the described optic probe device according in the claim 2 to 10 is characterized in that comprising:
The 1st branch element will penetrate and be injected into the light beam of above-mentioned biasing element from above-mentioned the 1st light source, turn back to the direction that is roughly parallel to CD;
The 2nd branch element will penetrate and be injected into light beam the above-mentioned biasing element from above-mentioned the 2nd light source, turn back to the direction that is roughly parallel to CD.
12. optic probe device according to claim 11 is characterized in that:
In above-mentioned the 1st optical system, above-mentioned relatively the 1st branch element disposes photodetector in the opposite side of above-mentioned the 1st light source;
Above-mentioned the 1st branch element has and allows the light beam that penetrates from above-mentioned the 1st light source to the 1st reflecting surface of above-mentioned biasing element reflection, and allows the light beam that penetrates from above-mentioned biasing element the 2nd reflecting surface to above-mentioned photodetector reflection.
13. optic probe device according to claim 6 is characterized in that: comprise actuator for objective lenses, wherein,
Above-mentioned actuator for objective lenses comprises,
Base;
Movable body is supported above-mentioned the 1st object lens and the 2nd object lens;
Bar-shaped elastic support member supports above-mentioned movable body and can move along focus direction and tracking direction relative to above-mentioned base;
The 1st focuses on drive division, and above-mentioned the 1st object lens are driven along focus direction;
The 2nd focuses on drive division, and above-mentioned the 2nd object lens are driven along focus direction;
The 1st follows the trail of drive division, and above-mentioned the 1st object lens are driven along following the trail of direction;
The 2nd follows the trail of drive division, and above-mentioned the 2nd object lens are driven along following the trail of direction; Wherein,
Above-mentioned bar-shaped elastic support member extends along the tangential direction of CD.
14. optic probe device according to claim 13 is characterized in that:
The above-mentioned the 1st focuses on drive division comprises, what be installed in above-mentioned movable body is fixed in the 1st magnet on the above-mentioned base by the 1st focusing coil of above-mentioned the 1st object lens one side with on the opposed position of the 1st focusing coil therewith;
The above-mentioned the 2nd focuses on drive division comprises, what be installed in above-mentioned movable body is fixed in the 2nd magnet on the above-mentioned base by the 2nd focusing coil of above-mentioned the 2nd object lens one side with on the opposed position of the 2nd focusing coil therewith.
15. optic probe device according to claim 14 is characterized in that comprising the phase place propulsion unit, wherein,
Above-mentioned actuator for objective lenses is configured to make the phase place of the focus direction displacement of above-mentioned the 2nd object lens to lag behind the displacement phase of the focus direction of above-mentioned the 1st object lens;
Above-mentioned phase place propulsion unit when carrying out the focus control of above-mentioned the 2nd object lens, in the specified frequency scope, makes the phase place of the focus direction displacement of above-mentioned the 2nd object lens be ahead of the displacement phase of the focus direction of above-mentioned the 1st object lens.
16. optic probe device according to claim 15, it is characterized in that: above-mentioned phase place propulsion unit, the phase filter of being pushed ahead by the phase place that makes above-mentioned the 2nd focusing drive division offer the drive signal of above-mentioned focusing coil in the specified frequency scope constitutes.
17. optic probe device according to claim 14 is characterized in that: comprise the phase place propulsion unit, wherein,
Above-mentioned actuator for objective lenses is configured to make the phase place of displacement of the focus direction of above-mentioned the 1st object lens to lag behind the displacement phase place of the focus direction of above-mentioned the 2nd object lens;
Above-mentioned phase place propulsion unit when carrying out the focus control of above-mentioned the 1st object lens, in the specified frequency scope, makes the phase place of displacement of the focus direction of above-mentioned the 1st object lens be ahead of the displacement phase of the focus direction of the 2nd object lens.
18. optic probe device according to claim 17, it is characterized in that: above-mentioned phase place propulsion unit, the phase filter of being pushed ahead by the phase place that makes above-mentioned the 1st focusing drive division offer the drive signal of above-mentioned focusing coil in the specified frequency scope constitutes.
19. according to claim 16 or 18 described optic probe devices, it is characterized in that: above-mentioned phase filter, its structure are that Hi-pass filter and low-pass filter are made up, and in above-mentioned specified frequency scope the phase place of above-mentioned drive signal are pushed ahead.
20. each the described optic probe device according in the claim 15 to 19 is characterized in that: above-mentioned specified frequency scope is to make above-mentioned bar-shaped elastic support member produce the frequency range of natural resonance.
21. each the described optic probe device according in the claim 14 to 20 is characterized in that:
Above-mentioned the 1st focusing coil and above-mentioned the 2nd focusing coil clip center of gravity that comprises above-mentioned movable body and the both sides that are configured in this face perpendicular to the face of above-mentioned tracking direction;
Above-mentioned movable body offers the current value of above-mentioned the 1st focusing coil and above-mentioned the 2nd focusing coil by adjustment, the axle run-off the straight that can extend along above-mentioned tangential direction.
22. according to claim 15 or 16 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 2nd object lens, more approach above-mentioned the 1st focusing coil by above-mentioned movable body being configured to its center of gravity along more above-mentioned the 2nd focusing coil of above-mentioned tangential direction, lag and become.
23. according to claim 17 or 18 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 1st object lens, more approach above-mentioned the 2nd focusing coil by above-mentioned movable body being configured to its center of gravity along more above-mentioned the 1st focusing coil of above-mentioned tangential direction, lag and become.
24. according to claim 17 or 18 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 1st object lens, by the gap amplitude between above-mentioned the 1st focusing coil and above-mentioned the 1st magnet is set for greater than the gap amplitude between above-mentioned the 2nd focusing coil and above-mentioned the 2nd magnet, lag and become.
25. according to claim 15 or 16 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 2nd object lens, by the gap amplitude between above-mentioned the 2nd focusing coil and above-mentioned the 2nd magnet is set for greater than the gap amplitude between above-mentioned the 1st focusing coil and above-mentioned the 1st magnet, lag and become.
26. according to claim 17 or 18 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 1st object lens by the generation magnetic field of above-mentioned the 1st magnet being set for the generation magnetic field less than above-mentioned the 2nd magnet, lags and become.
27. according to claim 15 or 16 described optic probe devices, it is characterized in that: the displacement phase of the focus direction of above-mentioned the 2nd object lens by the generation magnetic field of above-mentioned the 2nd magnet being set for the generation magnetic field less than above-mentioned the 1st magnet, lags and become.
28. an optical information is characterized in that comprising:
Optic probe device is as described in the claim 1 to 27 each;
Motor is used for rotating disc;
Control circuit receives the signal that obtains from above-mentioned optic probe device, based on above-mentioned optic probe device of this signal drive controlling and said motor.
29. a computing machine is characterized in that comprising:
Optical information is as described in claim 28;
Input media or input terminal are used for input information;
Calculation apparatus, the information that information of importing based on above-mentioned input media or above-mentioned optical information are regenerated performs calculations;
Output unit or lead-out terminal are used for showing or export the information that information that above-mentioned input media is imported or above-mentioned optical information are regenerated, and are perhaps calculated the result who draws by above-mentioned calculation apparatus.
30. an optical disc reproducing device is characterized in that comprising:
Optical information is as described in claim 28;
Demoder from information to the image will be transformed into image from the information signal that above-mentioned optical information obtains.
31. a Vehicular navigation system is characterized in that comprising:
Optical information is as described in claim 28;
Demoder from information to the image will be transformed into image from the information signal that above-mentioned optical information obtains.
32. an optical disc recorder is characterized in that comprising:
Optical information is as described in claim 28;
Scrambler from the image to information is transformed into image information the information that is write down by above-mentioned optical information.
33. an optical disc server is characterized in that comprising:
Optical information is as described in claim 28;
Input and output terminal is used for and message exchange is carried out in the outside.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004126593 | 2004-04-22 | ||
| JP126593/2004 | 2004-04-22 | ||
| JP350310/2004 | 2004-12-02 |
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| CN100495551C CN100495551C (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005800075327A Active CN100495551C (en) | 2004-04-22 | 2005-04-18 | Optical head device and optical information device, computer, optical disc generator, vehicle navigation system, optical recorder and optical disc server |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676070A (en) * | 2012-09-24 | 2014-03-26 | 株式会社东芝 | Lens driving device, information recording and playback apparatus, and electronic instrument |
-
2005
- 2005-04-18 CN CNB2005800075327A patent/CN100495551C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676070A (en) * | 2012-09-24 | 2014-03-26 | 株式会社东芝 | Lens driving device, information recording and playback apparatus, and electronic instrument |
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| Publication number | Publication date |
|---|---|
| CN100495551C (en) | 2009-06-03 |
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