CN100356464C - Integrated basic optical system of disk pickup device - Google Patents
Integrated basic optical system of disk pickup device Download PDFInfo
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- CN100356464C CN100356464C CNB2004100842326A CN200410084232A CN100356464C CN 100356464 C CN100356464 C CN 100356464C CN B2004100842326 A CNB2004100842326 A CN B2004100842326A CN 200410084232 A CN200410084232 A CN 200410084232A CN 100356464 C CN100356464 C CN 100356464C
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Abstract
The present invention relates to an integrated basic optical system of an optical-disk pickup device, which comprises an optical-element forming layer with a plurality of light accepting elements, a collimator layer with a collimating lens and formed by stacking on the upper surface of the optical-element forming layer, a hologram layer stacked on the upper surface of the collimator layer to form a hologram, a first polarizing plate arranged on the position where light of more than one time passes through, and a second polarizing plate arranged on the position where light of less than one time passes through, wherein the light of more than one time is diffracted from the hologram, and the light of less than one time is diffracted from the hologram. The first polarizing plate and the second polarizing plate are mutually and vertically crossed in a polarization direction, the light accepting elements are arranged on the optical-element forming layer formed according to each dividing area of the collimator, and diffracted light is gathered on the optical-element forming layer. The stacking type integrated optical system of an optical-disk pickup device of the present invention is easy to realize mass production, the size of the system also realizes miniaturization and light style, and the system can be suitable for a portable device.
Description
(1) technical field
The invention relates to the pickup optical system of disk pickup system, especially about by with the existing pickup optical system lamination that constitutes by a plurality of separated components and integrated, to enlarge productibility and to realize a kind of integrated basic optical system of disk pickup of the integrated pickup optical system of lamination type of ultra-thinization.
(2) background technology
In the disk player field, to the high density storage mode that uses DVD and blue laser optic disk (BLUE LD), recording capacity constantly increases thereupon from CD.The increase of this recording capacity mainly relies on optical characteristics such as improving digital ring (NA:numerical aperture) and wavelength to realize, but technical restriction is probably run in the raising of this optical characteristics, so the technology of the technical restriction be used to surmount this optical characteristics is discussed recently just in many aspects.In this technology, one of them is exactly the magnetooptic recording mode, and it uses the clear technology of magnetic supersolution, and recording density is brought up to more than the some optical confinement.
Fig. 1 discloses the concept map of existing magnetooptic disc with the formation of pick-up system.
As shown in the figure, existing light pick-up system comprises following formation: the light-emitting component 10 of irradiates light, make the collimation lens (collimate lens) 20 of the parallel light refraction of light-emitting component, make light by collimation lens 20 to the beam splitter 30 of object lens 80 refractions, make the object lens 80 of rayed on CD 90 by beam splitter 30, if rely on the reflecting surface refraction from the light of CD 90 reflections, then will be to S ripple with refract light, Wollaston (Wollaston) prism 40 that the light beam of P ripple and the 3 bundle light incidents that S ripple and P ripple are mixed separates, make imaging len 50 and concavees lens 60, from light beam, measure the photo detector 70 of signal by concavees lens 60 by the photoimaging of wollaston prism 40.
Above-mentioned photo detector 70 is made of the lens diode.
Above-mentioned wollaston prism 40 is made of disdiaclasts such as crystals, and the polarisations that will have 45 degree separate by 50: 50 ratio of S ripple and P ripple and change the path.
Below state with regard to the action of existing light pick-up system.
Action at the CD identifying recording layer is: if shine strong beam to CD 90 from light-emitting component 10, light beam irradiates on the point (spot) on the CD 90 then temperature rise, reach than the high temperature of Curie temperature that the magnetisable material that is coated with on the CD 90 is lost magnetism; At this moment, and have high-intensity magnetic field on the outer magnetic head of CD 90 adjacent settings, to change the magnetic direction line item of going forward side by side.
The action of playing the data on the CD is: if send light beam from light-emitting component, light beam then is radiated on the CD 90 via collimation lens 20, beam splitter 30 and object lens 80; At this moment, in via beam splitter 30,, change polarization direction according to the magnetic direction of transmission on CD by the light beam of linear polarization.
The light that is radiated on the CD 90 is reflected, and passes through wollaston prism 40 via object lens 80 and beam splitter 30 again.In via beam splitter 30, light beam is radiated on the photo detector 70 after by imaging len 50 and concavees lens 60 after being separated into S zero diopter ripple and P zero diopter ripple.The ratio of photo detector 70 pairs of S zero diopters ripple and P zero diopter ripple compares and perceptual signal.
In order to realize this record and playback action smoothly, must have on CD 90, correctly to focus on also servo (servo) action of pursuit path.Thereby, as the error detection method that is used to carry out this servo action, tracking error detects methods such as recommending (push-pull) method, 3 fluxs of light method and differential phase detection DPD (Differential Phase Detection) method, and focus error detecting method then has non-poor method and spot diameter detection SSD (the Spot Size Detection) method etc. of counting.In order to carry out this error-detecting, need a plurality of photo detectors 70, at length recording and narrating among the patented claim 1994-0003608 (Korea S) has an example.
As previously mentioned, the pick-up system is assembled, adjusts and formed in existing disk pickup system by a plurality of separated components, therefore assembling, adjusts very complicatedly, and accurate assembling is very difficult, and its performance and productibility have reduced; Because use a plurality of parts, thus must be useful on the preparation space of built-up member and the space that is used to adjust, thereby unfavorable to miniaturization, the lightness of pick-up system.Particularly, for being used to be applied to the subminiaturization of mancarried device, has unaccommodated at all structure.
(3) summary of the invention
The objective of the invention is for addressing the above problem, provide the integrated basic optical system of following a kind of disk pickup with the integrated pickup optical system of lamination type: by a plurality of parts integrated (integrated) one that existing separation is provided with, increase productibility, make size reach miniaturization, lightness, thereby go for mancarried device.
The present invention for achieving the above object, provide the integrated basic optical system of disk pickup: by comprising that the optical element that is provided with a plurality of photo detectors constitutes layer with following feature, be provided with collimation lens and the formed collimating apparatus layer of lamination on optical element constitutes layer, lamination and form the hologram layer of hologram on the collimating apparatus layer, in the hologram diffraction+1 light on the position of process in set the 1st Polarizer and the hologram-1 light of diffraction the 2nd set Polarizer on the position of process; Described the 1st Polarizer and the 2nd Polarizer are configured to the mutual orthogonal of polarization direction, and described photo detector is set at diffraction light that each cut zone according to described hologram forms and focuses on optical element and constitute on the position on the layer.
At this, the 1st above-mentioned Polarizer and the 2nd Polarizer it is desirable to be arranged on the collimating apparatus layer below.
And, on optical element formation layer, be fixed with light-emitting component, being only so effectively to the hologram layer irradiates light.
Effect of the present invention:
The invention provides have following effect the integrated basic optical system of disk pickup:
The function of not only bringing into play prior art equally and being had, and, can be easy to a large amount of productions by this with the basic optical system integration (integrate) and the lamination that constitute by a plurality of separated components of prior art; And, make its size realize miniaturization, lightness, to be applicable to mancarried device.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 discloses the concept map of existing magnetooptic disc with the formation of pick-up system.
Fig. 2～Fig. 6 is the synoptic diagram of the structure of expression one embodiment of the present of invention:
Fig. 2 is the outboard profile of pick-up system;
Fig. 3 is the outboard profile of the basic optical system among Fig. 2;
Fig. 4 is the ground plan of the hologram layer among Fig. 3;
Fig. 5 a is the outboard profile of the collimating apparatus layer among Fig. 3;
Fig. 5 b is the ground plan of the collimating apparatus layer among Fig. 3;
Fig. 6 is the oblique view that the optical element among Fig. 3 constitutes layer.
Fig. 7 is the movement concept figure of action that discloses the pickup optical system of one embodiment of the present of invention.
Shown in Fig. 8～Fig. 9 (c) is focus control method:
Fig. 8 is the outboard profile of hologram and photo detector;
Fig. 9 (a)～Fig. 9 (c) is the planimetric map of the photo detector among Fig. 8.
Shown in Figure 10 (a) and Figure 10 (b) is the method for the basic optical system of production one embodiment of the present of invention:
Figure 10 (a) is the oblique view of state of each layer separation of basic optical system;
The oblique view of the state of each layer of Figure 10 (b) combination.
The symbol description of major part in the accompanying drawing:
101: optical guided wave axle 110: hologram layer
113: holographic Figure 111: the 1st hologram pattern
122: the 2 Polarizers of 121: the 1 Polarizers
123: collimation lens 150: optical element constitutes layer
152: dividing plate 153: light-emitting component
155: distribution wire 158a: the 1st photo detector
158b: the 2nd photo detector 159a: the 3rd photo detector
159b: the 4th photo detector
(5) embodiment
Below, with reference to accompanying drawing, described in detail with regard to the integrated basic optical system embodiment of disk pickup of the present invention.
Just, with regard to the explanation that the present invention is carried out, do not hinder aim of the present invention for making it, decision will be for the omission that specifies of well-known function or formation.
And,, then give identical reference marks and also will omit its detailed description of carrying out for an and quite identical part identical with aforesaid formation.
The structure of Fig. 2～one embodiment of the present of invention that are shown in Figure 6, Fig. 2 is the outboard profile of pick-up system, Fig. 3 is the outboard profile of the basic optical system among Fig. 2, Fig. 4 is the ground plan of the hologram layer among Fig. 3, Fig. 5 a is the outboard profile of the collimating apparatus layer among Fig. 3, Fig. 5 b is the ground plan of the collimating apparatus layer among Fig. 3, and Fig. 6 is the oblique view that the optical element among Fig. 3 constitutes layer.
Shown in above-mentioned accompanying drawing, use the lamination type basic optical system of one embodiment of the present of invention to comprise following formation: rocking arm 200, the slider 250 that on rocking arm 200, supports by floatation part 210, the object lens 230 that on slider 250, are provided with according to driver 240, the basic optical system 100 that on rocking arm 200, is provided with, make basic optical system 100 and object lens 230 between the reflecting prism 220 propagated of the refraction of optical beam, collectiong focusing control signal and tracking signal and control module 260 that driver 240 is controlled in basic optical system 100.
Pickup optical system 100 comprises following formation: the optical element that is provided with a plurality of photo detectors (the 1st photo detector 158a, the 2nd photo detector 158b, the 3rd photo detector 159a, the 4th photo detector 159b) constitutes layer 150, be provided with collimation lens 123 and on optical element constitutes layer 150 the formed collimating apparatus layer 120 of lamination, lamination and the hologram layer 110 that forms on collimating apparatus layer 120.
On hologram layer 110, below holographic Figure 113 is arranged on.Holographic Figure 113 is divided into 2 zones, forms the 1st hologram pattern 111 and the 2nd hologram pattern 112, carries out the effect of servo hologram and beam splitter hologram simultaneously.The 1st hologram pattern 111 and the 2nd hologram pattern 112 make the interval of grating (grating) different, so that the distance of the focus of diffraction light is different; And make the pattern of grating different, so that the position that diffraction light focuses on is different.In one embodiment of the invention, hologram pattern 111/112 is divided into 2 and the decorative pattern of each hologram pattern 111/112 is set with curve; But, outside this, can be divided into a plurality ofly, and the decorative pattern of hologram pattern can be by the straight line setting.
On collimating apparatus layer 120, be provided with collimation lens 123, be provided with the 1st Polarizer 121 and the 2nd Polarizer 122 below.Collimation lens 123 can utilize micro-processing technology setting, and the 1st Polarizer 121 and the 2nd Polarizer 122 are configured to the mutual orthogonal of polarization direction.And, the 1st Polarizer 121 be set in servo and the holographic Figure 113 of beam splitter diffracted+1 time light on the position of process, the 2nd Polarizer 122 be set in servo and the holographic Figure 113 of beam splitter diffracted-1 light on the position of process.Polarizer 121/122 maybe can be carried out polarity grating (grating) of polarisation separation and so on by fan-shaped polarization element polarity element constitutes.Collimation lens 123 is through forming in remelting (reflow) flow process that disk glass is divided into many layers and carry out heating after the etching.
Optical element constitute layer 150 above be provided with light-emitting component 153, on the luminescence unit of light-emitting component 153, be provided with and make the anaclasis of being sent so that its reflecting body 154 that advances along optical guided wave axle 101.And, on constituting layer 150, optical element is provided with a plurality of photo detectors (158a-159b), and, and on constituting layer 150, optical element is provided with distribution wire 155 and lug plate 156 for the signal with photo detector (158a-159b) is sent to control module 260.Light-emitting component 153 uses laser diode.Photo detector (158a-159b) is made of the 1st photo detector 158a that is used for focal point control, the 2nd photo detector 158b, the 3rd photo detector 159a and the 4th photo detector 159b.Photo detector (158a, b, 159a, 159b) is set at diffraction light that each cut zone according to hologram forms and focuses on optical element and constitute on the position on the layer 150.
The 1st photo detector 158a be set at according to the 1st holographic Figure 111 diffraction formed+1 diffraction light focuses on optical element and constitutes on the position on the layer 150.The 2nd photo detector 158b be set at according to the 2nd holographic Figure 112 diffraction formed+1 diffraction light focuses on optical element and constitutes on the position on the layer 150.
And, the 3rd photo detector 159a is set at according to formed-1 diffraction light of the 1st holographic Figure 111 diffraction and focuses on the position that optical element constitutes layer 150, and the 4th photo detector 159b is set at and focuses on optical element according to formed-1 diffraction light of the 2nd holographic Figure 112 diffraction and constitute on the position on the layer 150.
On optical element formation layer 150, also comprise dividing plate 152.
Below, state with regard to the action of one embodiment of the present of invention.
Fig. 7 is the movement concept figure that discloses the pickup optical system of one embodiment of the present of invention.
Identical in the action of the enterprising line item of CD with existing pick-up system, observe playing process, if send light from light-emitting component 153, the light that is sent then advances along the optical guided wave axle, is radiated on the CD 90 by reflecting prism 220 and object lens 230.Be radiated at light on the CD 90 according to the signal that is recorded on the magneto-optic material on the CD 90, be reflected after changing polarization direction according to kerr Rotation (Ke Er optically-active) phenomenon, again by object lens 230 and the reflecting prism 220 incident basic optical 100b of system.
The light of the incident basic optical 100b of system is divided into multi-beam perhaps by means of diffraction in by servo and the holographic Figure 113 of beam splitter.In divided light ,+1 time diffraction light 102a/103a passes through the 2nd Polarizer 122 by 121 ,-1 diffraction light 102b/103b of the 1st Polarizer, and it has the polarity of mutual orthogonal.
By in the light of Polarizer 121/122, according to the 1st holographic Figure 111 diffraction formed+1 diffraction light 102a incident the 1st photo detector 158a ,-1 diffraction light 102b incident the 3rd photo detector 159a; According to the 2nd holographic Figure 112 diffraction formed+1 diffraction light 103a incident the 2nd photo detector 158b ,-1 diffraction light 103b incident the 4th photo detector 159b.
The magnetic signal detection method is: if Polarizer 121/122 vertically is provided with mutually by polarization direction, measure the light by Polarizer 121/122 respectively and obtain its ratio, then can what rotate according to the polarization direction that the signal that is write down on the CD is measured the light that is shone.Thereby, can calculate summation, and play the signal that is write down on the CD at summation measured signal on the 3rd photo detector 159a and the 4th photo detector 159b of measured signal on the 1st photo detector 158a and the 2nd photo detector 158b.
Focus control method is to use spot diameter to detect SSD (spot size detection) method, and tracking and controlling method is to use (push-pull) method of recommending.But, also can use other method to focus on and tracking Control in addition, this also belongs to interest field of the present invention.
Shown in Fig. 8～Fig. 9 (c) is focusing controlling method.Fig. 8 is the outboard profile of hologram and photo detector.Fig. 9 (a)～Fig. 9 (c) is the planimetric map of the photo detector among Fig. 8.
As previously mentioned, it is different that the 1st holographic Figure 111 and the 2nd holographic Figure 112 are configured to make the distance of focus of diffraction light.That is, the 1st holographic Figure 111 is set to very wide at interval, thereby the distance of focal point F 1 is very long; The 2nd holographic Figure 112 is set to very tight at interval, thereby the distance of focal point F 2 is very narrow and small.It then is more satisfactory that photo detector (158a-159b) is set on the intermediate point of focal point F 1 and focal point F 2 under normal condition.
Under the accurately relative situation of the focus of 90 of object lens 230 and CDs, shown in Fig. 9 (a), light is focused on the photo detector (158a, 158b, 159a, 159b).Thereby as following mathematical formulae 1, defined Fe value is 0.At this moment, the action that focusing is controlled is not necessary.
[numerical expression 1]
Fe＝{(A1+A3+B2)-(A2+B1+B3)}+{(C1+C3+D2)-(C2+D1+D3)}
But when becoming far away at the interval of 90 of object lens 230 and CDs, shown in Fig. 9 (b), light is focused, and then the Fe value becomes bigger than 0.At this moment, start driver 240 and control object lens 230 near CDs.
And when becoming near at the interval of 90 of object lens 230 and CDs, shown in Fig. 9 (c), light is focused, and then the Fe value becomes littler than 0.At this moment, start driver 240 and control object lens 230 away from CD.
Tracking and controlling method is: if focus on a side skew of the pit of point on CD on the CD, then different by the light quantity of the 1st holographic Figure 111 and the 2nd hologram; Therefore, by controlling,, then can regulate tracking error so that the summation that is radiated at the light quantity on the 1st photo detector 158a and the 3rd photo detector 159a is identical with the summation of light quantity on being radiated at the 2nd photo detector 158b and the 4th photo detector 159b.
Shown in Figure 10 (a) and Figure 10 (b) is the method for the basic optical system of production one embodiment of the present of invention.Figure 10 (a) is the oblique view of state of each layer separation of basic optical system.The oblique view of the state of each layer of Figure 10 (b) combination.
As shown in the figure, after a plurality of parts be set with grid on each layer 110/120/150 form, each layer 110/120/150 arranged, behind lamination and the joint, 300a cuts it along transversal, can produce a plurality of basic optical system by this.
As mentioned above, in one embodiment of the invention, the function of not only bringing into play prior art equally and being had, and, can be easy to a large amount of productions by this with the existing basic optical system integration (integrate) and the lamination that constitutes by a plurality of separated components; And, make its size realize miniaturization, lightness, go for mancarried device by this.
And, cut apart the light that is used to carry out the servo-controlled light of existing focus control and tracking Control and detects magnetic signal by a hologram, can further reduce the size of basic optical system by this.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (3)
1, a kind of integrated basic optical system of disk pickup is characterized in that comprising:
The optical element that is provided with a plurality of photo detectors constitutes layer;
Be provided with collimation lens and the formed collimating apparatus layer of lamination on described optical element constitutes layer;
Lamination and form the hologram layer of hologram on described collimating apparatus layer;
Diffraction from described hologram+1 light on the position of process set the 1st Polarizer and-1 light of diffraction from described hologram the 2nd set Polarizer on the position of process;
It is mutually orthogonal that described the 1st Polarizer and the 2nd Polarizer are configured to polarization direction, and described photo detector is set at diffraction light that each cut zone according to described hologram forms and focuses on optical element and constitute on the position on the layer.
2, the integrated basic optical system of disk pickup as claimed in claim 1 is characterized in that:
Described the 1st Polarizer and the 2nd Polarizer be arranged on described collimating apparatus layer below.
3, the integrated basic optical system of disk pickup as claimed in claim 1 is characterized in that:
Described optical element constitutes layer and goes up a fixedly light-emitting component, with can be to described hologram layer irradiates light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100842326A CN100356464C (en) | 2004-11-17 | 2004-11-17 | Integrated basic optical system of disk pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100842326A CN100356464C (en) | 2004-11-17 | 2004-11-17 | Integrated basic optical system of disk pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1779816A CN1779816A (en) | 2006-05-31 |
| CN100356464C true CN100356464C (en) | 2007-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100842326A Expired - Fee Related CN100356464C (en) | 2004-11-17 | 2004-11-17 | Integrated basic optical system of disk pickup device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0581519A2 (en) * | 1992-07-30 | 1994-02-02 | Matsushita Electric Industrial Co., Ltd. | Optical pick-up apparatus |
| JP2001155366A (en) * | 2000-10-04 | 2001-06-08 | Hitachi Ltd | Optical head and its manufacturing method |
| CN1319843A (en) * | 2000-01-20 | 2001-10-31 | 三星电子株式会社 | Near field record and replay optical head and making method thereof |
-
2004
- 2004-11-17 CN CNB2004100842326A patent/CN100356464C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0581519A2 (en) * | 1992-07-30 | 1994-02-02 | Matsushita Electric Industrial Co., Ltd. | Optical pick-up apparatus |
| CN1319843A (en) * | 2000-01-20 | 2001-10-31 | 三星电子株式会社 | Near field record and replay optical head and making method thereof |
| JP2001155366A (en) * | 2000-10-04 | 2001-06-08 | Hitachi Ltd | Optical head and its manufacturing method |
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| Publication number | Publication date |
|---|---|
| CN1779816A (en) | 2006-05-31 |
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