CN101221780B - Multi-wavelength optical read-write head device - Google Patents
Multi-wavelength optical read-write head device Download PDFInfo
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- CN101221780B CN101221780B CN200710002306A CN200710002306A CN101221780B CN 101221780 B CN101221780 B CN 101221780B CN 200710002306 A CN200710002306 A CN 200710002306A CN 200710002306 A CN200710002306 A CN 200710002306A CN 101221780 B CN101221780 B CN 101221780B
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Abstract
The invention provides a multi-wavelength optical pickup head device which comprises a first laser diode and a corresponding first raster, a second laser diode and a corresponding second raster, a third laser diode and a corresponding raster, a dispersion prism, a polarization dispersion prism, a field lens system, a first spectroscope and a first photodetector and a second spectroscope and a second photodetector, wherein the first laser diode emits first wavelength lasers; the second laser diode emits second wavelength lasers; the third laser diode emits third wavelength lasers; the dispersion prism is used for separating light paths emitted by the second laser diode and the third laser diode; the polarization dispersion prism is used for separating light paths emitted by the first laser diode; the field lens system comprises a reflector, a collimating lens, a one-fourth wave plate and a field lens; the first spectroscope and the first photodetector correspond to the reflected light paths of the first wavelength lasers through the filed lens system; the second spectroscope and the second photodetector correspond to the reflected light paths of the second wavelength lasers and the third wavelength lasers through the filed lens system.
Description
Technical field
The present invention is particularly to a kind of multi-wavelength optical read-write head device about a kind of optical read-write head device.
Background technology
In recent years, because the raising of standard of living, people are also more and more high to the capacity requirement of Storage Media.Along with starting broadcasting of Digital Television, light stores the blue light field trend that is inevitable that enters, yet when putting into practice blue light and storing, the also essential problem of considering the previous system compatibility of system.More particularly, just want energy compatible CD, DVD and three kinds of specifications of blue light, the design of optical head just becomes very complicated thus, and it is big that volume also and then becomes.Therefore, the present invention is directed to this problem, propose a multi-wavelength optical read-write head structure, utilize assembly to share and reach the purpose that component count reduces, volume is little, cost reduces.
United States Patent (USP) US discloses a kind of CD of being applicable to and DVD dual wavelength optical read/write head for 6,304, No. 542, adopts multiple shared assembly, to reach the integrated purpose of read/write head.Yet, only integrate CD and DVD dual wavelength optical read/write head still can't satisfy the high-resolution demand of blue light.
Fig. 1 show tradition be applicable to CD, DVD and blue light the three-wavelength optical read-write head device read the light path synoptic diagram.In Fig. 1, distinctly adopt three groups of laser diode light sources 110,120 and 130 and three corresponding component light prisms 115,125 and 135.Laser diode light source 110,120 and 130 laser that sent distinctly pass through corresponding grating 112,122 and 132 behind three component light prisms 115,125 and 135, again behind collimating mirror 140, by catoptron 150 reflections, arrive disc 170 to be read in object lens 160 through 1/4 λ ripple plate 155.Then, at reflex time, light path is through three component light prisms 115,125 and 135, and behind lens pillar (cylinder lens) 180, arrives at photodetector integrated circuit (photodetector integrated circuit is called for short PDIC) assembly 190.
Though Fig. 1's is simple in structure, yet because the focal length of 140 pairs of different wave lengths of collimating mirror is all different.Therefore when reading the disc of different kenels, collimating mirror 140 must move by trace, and this control degree of difficulty to blue light grade optical read/write head is high.For the system that is applied to blue light, this optical R/W header structure is very difficult in the working control concerted action.
Moreover conventional art adopts three component light prisms 115,125 and 135, and therefore the Amici prism tool directly increases the manufacturing cost of three-wavelength optical read-write head device than complicated structure and higher unit price.
Fig. 2 show tradition another be applicable to CD, DVD and blue light the three-wavelength optical read-write head device read the light path synoptic diagram.In Fig. 2, with regard to DVD and blue light reading format, its corresponding laser diode light source 210 and 230 laser that sent distinctly pass through corresponding grating 212 and 232, through Amici prism 215 and 235, arrive disc (not shown) to be read through collimating mirror 260 and object lens 270 by catoptron 250 reflections.Then, at reflex time, photodetector integrated circuit (PDIC) assembly 290 and through lens pillar (cylinder lens) 280, is arrived in the light echo path after 235 refractions of Amici prism 240 and Amici prism.This conventional art is shared optical sensor integrated circuit (PDIC) assembly 290 of DVD and blue light HD-DVD form, yet DVD and blu-ray format are still had a different wave length, and it is focused on the same PDIC assembly 290 jointly, still have the difficulty of reality.
On the other hand, with regard to the traditional C D format, it adopts a full figure laser optics assembly 220.Full figure laser optics assembly 220 comprises CD lasing light emitter (the about 780nm of wavelength), diffraction grating and optical detector components.The optical path that reads of CD is to send laser (the about 780nm of wavelength) by full figure laser optics assembly 220, arrives objective system through Amici prism 215 and 240.At reflex time,, reach 3 D full-figure laser optics assembly 220 also via former optical path.Yet because the multi-functional of full figure laser optics assembly 220 tool complexity, its integrated assembly costs an arm and a leg, and directly increases the manufacturing cost of three-wavelength optical read-write head device.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of multi-wavelength optical read-write head device.A kind of read/write head light channel structure that possesses at least three kinds of wavelength simultaneously is provided, shares by the part assembly, the component count of whole optical head is reduced, volume also dwindles effectively, reaches the target of volume-diminished, cost reduction.
For reaching above-mentioned purpose, the invention provides a kind of multi-wavelength optical read-write head device, comprising: one first laser diode, it sends the laser of first wavelength, corresponding to one first grating; One second laser diode, it sends the laser of second wavelength, corresponding to one second grating, one the 3rd laser diode, it sends the laser of three-wavelength, corresponding to one the 3rd grating; One first Amici prism, it is in order to separate this second laser diode and the 3rd light path that laser diode sends; One second Amici prism, it is in order to reflect this first laser that laser diode sends; One objective system, it comprises a catoptron, a collimating mirror, a quarter wave plate, reaches object lens; One first spectroscope and one first photodetector are corresponding to the reflected light path of this first wavelength laser through this objective system; And one second spectroscope and one second photodetector, corresponding to this second wavelength laser and this three-wavelength laser reflected light path through this objective system.
The laser that sends of this first laser diode wherein, earlier through this first grating, and then inject this second Amici prism, after this second Amici prism reflection, then enter this objective system, read after the disc data, again this laser-bounce is gone back from this objective system, through the second Amici prism transmission, through first spectroscope and this second spectroscope transmission, arrive at this first incident light detecting device at last again;
The laser that this second laser diode and the 3rd laser two extreme pipes send, earlier respectively through this second grating, the 3rd grating, and then inject this first Amici prism, after this first Amici prism transmission, enter this first Amici prism, after this first spectroscope reflection, enter this second Amici prism, after this second Amici prism transmission, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, after second Amici prism and the first spectroscope transmission, reflex to this second incident light detecting device through this second spectroscope again.
For reaching above-mentioned purpose, the present invention provides a kind of multi-wavelength optical read-write head device in addition, comprising: one first laser diode, and it sends the laser of first wavelength, corresponding to one first grating; One second laser diode, it sends the laser of second wavelength or the laser of three-wavelength, corresponding to one second grating; One Amici prism is in order to reflect the laser that this first laser diode sends first wavelength; One objective system, it comprises a catoptron, a collimating mirror, a quarter wave plate, reaches object lens; One first spectroscope and one first photodetector are corresponding to the reflected light path of this first wavelength laser through this objective system; And one second spectroscope and one second photodetector, corresponding to this second wavelength laser and this three-wavelength laser reflected light path through this objective system.
The laser that sends of this first laser diode wherein, earlier through this first grating, and then inject this Amici prism, after this Amici prism reflection, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, through the Amici prism transmission, through first spectroscope and this second spectroscope transmission, arrive at this first incident light detecting device at last again;
The laser that this second laser diode sends, through this second grating, enter this first spectroscope, after this first spectroscope refraction, enter this Amici prism, after this Amici prism transmission, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, after the Amici prism and the first spectroscope transmission, reflex to this second incident light detecting device through this second spectroscope again.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below:
Description of drawings
Fig. 1 shows that tradition is applicable to the light path synoptic diagram of the three-wavelength optical read-write head device of CD, DVD and blue light;
Fig. 2 shows tradition, and another is applicable to the light path synoptic diagram of the three-wavelength optical read-write head device of CD, DVD and blue light;
Fig. 3 shows the light path synoptic diagram according to the multi-wavelength optical read-write head device that is applicable to CD, DVD and blue light of the embodiment of the invention; And
Fig. 4 shows the light path synoptic diagram of the multi-wavelength optical read-write head device that is applicable to CD, DVD and blue light according to another embodiment of the present invention.
The primary clustering symbol description
Tradition part (Fig. 1, Fig. 2)
100～three-wavelength optical read-write head device;
110,230～the first laser diode light sources;
120,210～the second laser diode light sources;
220～full figure laser optics assembly;
130～the 3rd laser diode light sources;
112,122,132,212,232～grating;
115,125,135,215,235,240～Amici prism;
140,260～collimating mirror;
150,250～catoptron;
160,270～object lens;
170～disc;
180,280～lens pillar;
190,290～photodetector integrated circuit package.
This case part (Fig. 3, Fig. 4)
310,410～blue light laser source;
320～DVD lasing light emitter;
330～CD lasing light emitter;
420～CD, DVD share lasing light emitter;
312,322,332,412,422～grating;
315,325,415～Amici prism;
350,450～objective system;
340,440～the first dull and stereotyped spectroscopes;
345,445～the second dull and stereotyped spectroscopes;
370,470～disc;
380,480～plano-concave lens;
390,490～the first photodetector integrated circuit packages;
385,485～the second photodetector integrated circuit packages.
Embodiment
The present invention is about a kind of three-wavelength optical read-write head device that is applicable to CD, DVD and blue light, utilize the beam split eyeglass that the light echo of different wave length is separated, the reflected light of the wavelength that wherein has penetrates this spectroscope, the reflected light of the wavelength that has then reflects and follows another path, make the multi-wavelength to reach the purpose that component count lowers, volume is little, cost reduces altogether.
According to the embodiment of the invention, utilize the light channel structure of traditional DVD-RW optical read/write head.Light echo is partly adopted two slab design, and wherein the blue light light echo is adopted and is penetrated design, and CD and DVD light echo part then utilize dull and stereotyped first reflecting surface in rear that light echo is reflected, and reenter and penetrate corresponding PDIC assembly.Whole optical path component is most of to be shared, and light channel structure is simply easy to implement, not only can reduce cost, and the volume of device itself also can dwindle.
Fig. 3 shows the light path synoptic diagram according to the multi-wavelength optical read-write head device that is applicable to CD, DVD and blue light of the embodiment of the invention.See also Fig. 3, the light path of the optical read/write head of present embodiment is adopted separate type, that is the lasing light emitter 310,320 and 330 of CD, DVD and blue light is independent separately.Wherein the input path of blue light is that (laser diode LD) 310 sends back (about 405 nanometers of wavelength (nm)), earlier through a grating 312, and then injects polarization Amici prism (PBS) 315 by laser diode.After polarization Amici prism (PBS) 315 reflections, then enter objective system 350.The process that laser enters objective system is, first incident one catoptron (fold mirror), and laser is reflected upwards then, reenters and penetrates collimating mirror.Originally the laser that disperse this moment can become directional light, and incident quarter wave plate again then converts the laser of script linear polarization to circularly polarized laser.Incident one colored filter (color filter) more afterwards, with decision light beam effective diameter, last incident focusing objective len gathers laser on disc 370.
Afterwards, disc goes back laser-bounce again, and the laser that is reflected basically can follow original route and go back, but through quarter wave plate the time, circularly polarized light can become linearly polarized photon again again, but the polarization direction of laser can be orthogonal with the polarization direction of former incident laser at this moment.After laser was through catoptron (fold mirror), incident polarization Amici prism (PBS) 315 o'clock can be with the kenel incident of P polarized light, and this moment, laser can walk to penetrate the path.Through the first dull and stereotyped spectroscope 340 and the second dull and stereotyped spectroscope 345 time, can walk to penetrate the path, arrive at incident light detecting device integrated circuit (PDIC) assembly 390 at last.Then, photodetector integrated circuit (PDIC) assembly 390 can convert light signal to required servosignal and radio frequency (RF) signal.
About the read-write part of DVD disc, its working method is as described below.With the laser of about 650 nanometers of wavelength (nm) from DVD laser diode (laser diode, LD) after 320 emissions, earlier through corresponding grating 322, and then penetrate the Amici prism 325 incidents first dull and stereotyped spectroscope 340, after this moment, laser was reflected, incident polarization Amici prism (PBS) 315 then enters objective system 350 then.The process that laser enters objective system is, earlier through incident collimating mirror again after catoptron (fold mirror) reflection.The laser that originally disperse this moment can become directional light.Then, laser is the incident quarter wave plate again, converts the laser of script linear polarization to circularly polarized laser.And then the incident focusing objective len, at last with laser focusing on the data of disc 370.As aforementioned blue light, disc goes back laser-bounce again afterwards, and the laser that is reflected basically can follow original route and go back, but through quarter wave plate the time, circularly polarized light can become linearly polarized photon again again.After laser was through catoptron (fold mirror), incident polarization Amici prism (PBS) 315 o'clock can be with linearly polarized photon incident.Through the first dull and stereotyped spectroscope 340 time, part laser can walk to penetrate the path, but through the second dull and stereotyped spectroscope 345 time, can walk reflection paths, after plano-concave lens 380, arrives at incident second photodetector integrated circuit (PDIC) assembly 385 at last.Then, second photodetector integrated circuit (PDIC) assembly 385 can convert light signal to required servosignal and radio frequency (RF) signal.
Moreover about the read-write part of CD disc, its working method is as described below.With the laser of about 780 nanometers of wavelength (nm) from CD laser diode (laser diode, LD) after 330 emissions, at grating 332 through correspondence, and then penetrate the Amici prism 325 incidents first dull and stereotyped spectroscope 340, the light beam path of advancing is roughly identical with DVD laser afterwards, but can be through colored filter (color filter), with decision light beam effective diameter before the incident object lens, and then the incident focusing objective len, at last with laser focusing on disc data.
Disc goes back laser-bounce again afterwards, the laser that is reflected basically can be similar with DVD laser, through the first dull and stereotyped spectroscope 340 time, can walk to penetrate the path, but the time through the second dull and stereotyped spectroscope 345, can walk reflection paths,, arrive at incident second photodetector integrated circuit (PDIC) assembly 385 at last after plano-concave lens 380.Then, second photodetector integrated circuit (PDIC) assembly 385 can convert light signal to required servosignal and radio frequency (RF) signal.
Fig. 4 shows the light path synoptic diagram of the multi-wavelength optical read-write head device that is applicable to CD, DVD and blue light according to another embodiment of the present invention.Multi-wavelength optical read-write head device among Fig. 4, its structure and light path omit identical narration similar in appearance to the multi-wavelength optical read-write head device of Fig. 3 at this.The embodiment of the multi-wavelength optical read-write head device among Fig. 4 of the present invention and the embodiment difference of the multi-wavelength optical read-write head device among Fig. 3 are, second embodiment uses dual wavelength laser diode, it integrates the laser diode that comprises CD and two kinds of wavelength of DVD simultaneously, with the shared volume of further reduction multi-wavelength optical read-write head device.In addition, present embodiment only uses an Amici prism 415, therefore directly reduces the manufacturing cost of multi-wavelength optical read-write head device.
First photodetector integrated circuit (PDIC) assembly and second photodetector integrated circuit (PDIC) assembly at above-mentioned Fig. 3 and Fig. 4, the position can be exchanged mutually in some cases, for example the blue laser light echo is to reenter to penetrate corresponding photodetector integrated circuit (PDIC) assembly after the first dull and stereotyped spectroscope reflection at last, the light echo of CD and two kinds of laser of DVD the most then is to penetrate after the first dull and stereotyped spectroscope, penetrates the second dull and stereotyped spectroscope pairing photodetector integrated circuit of last incident (PDIC) assembly again.Certainly, this moment, the first dull and stereotyped spectroscope and its pairing plated film of the second dull and stereotyped spectroscope also must cooperate change.
In like manner, also can exchange each other at first long wavelength laser diode of above-mentioned Fig. 3 and Fig. 4 and the position of second wavelength and three-wavelength laser diode, just this moment, the first dull and stereotyped spectroscope and its pairing plated films of associated component such as the second dull and stereotyped spectroscope and polarization Amici prism also must cooperate change.
Though the present invention with preferred embodiment openly as above; so it is not in order to limit scope of the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (9)
1. multi-wavelength optical read-write head device comprises:
One first laser diode, it sends the laser of first wavelength, corresponding to one first grating;
One second laser diode, it sends the laser of second wavelength, corresponding to one second grating, one the 3rd laser diode, it sends the laser of three-wavelength, corresponding to one the 3rd grating;
One first Amici prism, it is in order to separate this second laser diode and the 3rd light path that laser diode sends;
One second Amici prism, it is in order to reflect this first laser that laser diode sends;
One objective system, it comprises a catoptron, a collimating mirror, a quarter wave plate, reaches object lens;
One first spectroscope and one first photodetector are corresponding to the reflected light path of this first wavelength laser through this objective system; And
One second spectroscope and one second photodetector, corresponding to this second wavelength laser and this three-wavelength laser through the reflected light path of this objective system,
The laser that sends of this first laser diode wherein, earlier through this first grating, and then inject this second Amici prism, after this second Amici prism reflection, then enter this objective system, read after the disc data, again this laser-bounce is gone back from this objective system, through this second Amici prism transmission, through first spectroscope and this second spectroscope transmission, arrive at this first incident light detecting device at last again;
The laser that this second laser diode and the 3rd laser diode send, earlier respectively through this second grating, the 3rd grating, and then inject this first Amici prism, after this first Amici prism transmission, enter this first spectroscope, after this first spectroscope reflection, enter this second Amici prism, after this second Amici prism transmission, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, after second Amici prism and the first spectroscope transmission, reflex to this second incident light detecting device through this second spectroscope again.
2. multi-wavelength optical read-write head device according to claim 1, wherein the optical maser wavelength sent of this first laser diode is about 405 nanometers (nm).
3. multi-wavelength optical read-write head device according to claim 1, wherein the optical maser wavelength sent of this second laser diode is about 650 nanometers (nm).
4. multi-wavelength optical read-write head device according to claim 1, wherein the optical maser wavelength sent of the 3rd laser diode is about 780 nanometers (nm).
5. multi-wavelength optical read-write head device according to claim 1, wherein this quarter wave plate to the laser that above-mentioned first, second laser diode of major general sends changes into circular polarization by linear polarization, perhaps changes into linear polarization by circular polarization.
6. multi-wavelength optical read-write head device according to claim 1 comprises that also a plano-concave lens is arranged between this second spectroscope and this second photodetector.
7. multi-wavelength optical read-write head device comprises:
One first laser diode, it sends the laser of first wavelength, corresponding to one first grating;
One second laser diode, it sends the laser of second wavelength or the laser of three-wavelength, corresponding to one second grating;
One Amici prism, it is in order to reflect the laser that this first laser diode sends first wavelength;
One objective system, it comprises a catoptron, a collimating mirror, a quarter wave plate, reaches object lens;
One first spectroscope and one first photodetector are corresponding to the reflected light path of this first wavelength laser through this objective system; And
One second spectroscope and one second photodetector, corresponding to this second wavelength laser and this three-wavelength laser through the reflected light path of this objective system,
The laser that sends of this first laser diode wherein, earlier through this first grating, and then inject this Amici prism, after this Amici prism reflection, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, through this Amici prism transmission, through first spectroscope and this second spectroscope transmission, arrive at this first incident light detecting device at last again;
The laser that this second laser diode sends, through this second grating, enter this first spectroscope, after this first spectroscope reflection, enter this Amici prism, after this Amici prism transmission, then enter this objective system, after reading a disc data, again this laser-bounce is gone back from this objective system, after this Amici prism and the first spectroscope transmission, reflex to this second incident light detecting device through this second spectroscope again.
8. multi-wavelength optical read-write head device according to claim 7, wherein this quarter wave plate can change into circular polarization by linear polarization with the laser that above-mentioned first and second laser diode sends at least, perhaps changes into linear polarization by circular polarization.
9. multi-wavelength optical read-write head device according to claim 7 comprises that also a plano-concave lens is arranged between this second spectroscope and this second photodetector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710002306A CN101221780B (en) | 2007-01-11 | 2007-01-11 | Multi-wavelength optical read-write head device |
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| CN200710002306A CN101221780B (en) | 2007-01-11 | 2007-01-11 | Multi-wavelength optical read-write head device |
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| CN101221780A CN101221780A (en) | 2008-07-16 |
| CN101221780B true CN101221780B (en) | 2010-05-19 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828744A (en) * | 2005-02-28 | 2006-09-06 | 日立视听媒介电子股份有限公司 | Optical pickup and optical information reproducing device |
| CN1873797A (en) * | 2005-05-30 | 2006-12-06 | 三洋电机株式会社 | Optical pickup device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828744A (en) * | 2005-02-28 | 2006-09-06 | 日立视听媒介电子股份有限公司 | Optical pickup and optical information reproducing device |
| CN1873797A (en) * | 2005-05-30 | 2006-12-06 | 三洋电机株式会社 | Optical pickup device |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-222601A 2005.08.18 |
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