CN1430219A - Multi-wavelength optical read and write head - Google Patents
Multi-wavelength optical read and write head Download PDFInfo
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- CN1430219A CN1430219A CN 02100105 CN02100105A CN1430219A CN 1430219 A CN1430219 A CN 1430219A CN 02100105 CN02100105 CN 02100105 CN 02100105 A CN02100105 A CN 02100105A CN 1430219 A CN1430219 A CN 1430219A
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Abstract
A multi-wavelength optical R/W head is composed of at least more than 3 laser beam generator units for generating the laser beams with different wavelengthes, a light pilot unit consisting of optical diffraction element and focusing object lens for generating at least more than 3 diffraction effects with different diffraction angles and diffraction effect and focusing them to the data surface of optical record medium, and an optical pick-up element for converting optical signals to electric ones. At least more than 3 optical record media with different data storage densities can be accessed.
Description
Technical field
The present invention relates to a kind of optical read/write head, in order to the data in the access optical record medium, particularly a kind of optical read/write head that comes the optical record medium of access multiple (more than at least three kinds) different pieces of information storage density at least with multiple (more than three kinds) different wavelength of laser bundle.
Background technology
Adopt the technology of optical read-write head accessing optical record medium data, known by people already, and along with the storage volume of optical record medium and the increase of storage density, the structure of optical read/write head also constantly improves, it improves one of feature is exactly that the wavelength of the laser beam of access optical record medium shortens gradually, and numerical aperture of objective uprises gradually, and (the optically focused focus in order to the laser beam of access optical record medium diminishes, and its size is proportional to laser beam wavelength, and be inversely proportional to numerical aperture of objective), to adapt to the optical record medium that storage volume and storage density constantly increase.
In addition, the design of new-type optical read/write head must possess downward compatibility, just can either the new-type optical record medium of access, also can the old-fashioned optical record medium of access, so new-type optical read/write head is except the laser beam of the shorter wavelength that can send the new-type optical record medium of access, also must be able to send the laser beam of the longer wavelength of the old-fashioned optical record medium of access, or access otherwise, for this reason, existing several can two kinds of different pieces of information storage densities of access the optical read/write head of optical record medium (as CD and DVD), below these optical read/write heads are done an explanation:
Shown in Figure 1A, 1B, be the disclosed bifocus focusing objective len that produces different N A value in No. 5446565 patent case of the U.S., its laser beam that is produced at the laser beam generation unit marches to full image optical assembly 1 (Holographic Optical Element; H.O.E.) time, this full image optical assembly 1 can make the laser beam generation diffraction of process, and focus on optical record medium 40 by focusing objective len 2, and produce two kinds of angle of diffraction by this full image optical assembly 1 back, can make laser beam focus on different focus (data surface of the optical record medium 40 of different pieces of information storage density) by focusing objective len 2 again, with the optical record medium 40 of two kinds of different pieces of information storage densities of access.
As shown in Figure 2, this optical read/write head make two laser generation unit 3,4 the different wavelength of laser bundle that produces each via its optical path, and arrival focusing objective len 2, and according to the different N A value of different wavelength of laser bundle correspondence, and the optically focused focuses of the different sizes of formation, after optical record medium 40 reflections, turn back to light separately and detect assembly 5 and light beam generation unit 4 (wherein light beam generation unit 4 has the function that light detects assembly 5 concurrently), with the purpose of the optical record medium 40 that reaches two kinds of different pieces of information storage densities of access.
As shown in Figure 3, this optical read/write head then uses two light beam generation unit 3a, the different wave length laser beam that 3b produced, again by different optical path and optical module, and via focusing objective len 2a, 2b makes the different wave length laser beam can focus on different focuses (data surface of the optical record medium 40 of different pieces of information storage density), and after optical record medium 40 reflections, turn back to light and detect assembly 5 and light beam generation unit 3b (wherein light beam generation unit 3b has the function that light detects assembly 5 concurrently), with the purpose of the optical record medium 40 that reaches two kinds of different pieces of information storage densities of access.
Above-described optical read/write head, though optical record medium that can both two kinds of different pieces of information storage densities of access, but in tight demand to the optical record medium of higher data storage density, and must order about down with the characteristic of littler this optical record medium of optically focused focus ability access, above-mentioned optical read/write head can't be directly with its optical system access novel optical recording medium, and demand based on downward compatibility, the trend of following novel high-density optics must have the ability of the optical record medium (as CD and DVD) of the previous two kinds of different pieces of information storage densities of reversed access, but, above-mentioned optical read/write head has backwards-compatible optical record medium in previous two kinds of different pieces of information storage densities as if being expanded into, but meet just before expanding (as Figure 1A, can produce the bifocal object lens optical read/write head of different N A value among the 1B), or even the problem of complex structure, so develop a kind of can access CD, DVD and novel high-density recording medium or the optical record medium of this different pieces of information storage density more than three kinds at least, and simple structure, and the optical read/write head with extendibility is also just important in the extreme.
Summary of the invention
Fundamental purpose of the present invention is the optical read/write head that a kind of multi-wavelength is provided, and carries out data access with the optical record medium to different pieces of information storage density more than at least three kinds, and proposes special optical path design, makes read/write head have simple structure.
The optical read/write head of multi-wavelength disclosed according to the present invention, comprise more than at least three in order to produce different wavelength of laser bundle generation unit, light element and light detect assembly, wherein at least three above laser beam generation units are in order to produce the different wavelength of laser bundle, light element is configured in the optical path of read/write head in the heart, laser beam in order to guided laser bundle generation unit is advanced, and comprise diffraction optical assembly and focusing objective len, and light detects in the optical path that assembly is configured in read/write head equally in the heart, after the laser beam generation unit produces laser beam, by light element guided laser Shu Hangjin, until advancing to diffraction optical assembly, make different angle of diffraction and the diffracting effects of each self-forming of different wavelength of laser bundle more than at least three kinds, and the line focus object lens focusing is at the data surface of the optical record medium of different pieces of information storage density more than at least three kinds, and the laser beam that focuses on is after the optical record medium reflection, carry recorded data signal on the medium, follow previous read/write head optical path to return, detecting assembly by light at last receives, and light signal is converted to corresponding electric signal, optical record medium that read/write head can access different pieces of information storage density more than at least three kinds like this.
For making purpose of the present invention, structural attitude and function thereof are had further understanding, existing conjunction with figs. is described in detail as follows.
Description of drawings
Figure 1A, 1B are existing a kind of bifocus focusing objective len that produces different N A value;
Fig. 2 is existing a kind of optical read/write head with dual wavelength;
Fig. 3 has the optical read/write head of dual wavelength for existing another kind;
Fig. 4 is the configuration relation figure of each assembly among the present invention;
The optical path that Fig. 5 advances for the laser beam that is produced by a laser beam generation unit among the present invention;
Fig. 6 focuses on the synoptic diagram of optical record medium for after different wavelength of laser Shu Hangjing diffraction optical assembly changes its optical path among the present invention by focusing objective len;
When Fig. 7 A, 7B, 7C passed through diffraction optical assembly for laser beam among the present invention, this assembly was used for the electrode design of modulation liquid crystal molecule refractive index corresponding to the different wavelength of laser bundle;
Fig. 8 A, 8B, 8C are formed focus error signal during with the different wavelength of laser bundle access optical record medium corresponding with it among the present invention;
The optical path that Fig. 9 advances for the laser beam that is produced by another laser beam generation unit among the present invention;
The optical path that Figure 10 advances for the laser beam that is produced by another laser beam generation unit among the present invention;
Figure 11 is an another embodiment of the present invention;
Figure 12 is the structural drawing of multiwavelength laser bundle generation unit among Figure 11; And
Figure 13 detects the synoptic diagram that is provided with of the detection region of assembly and track-seeking signal detection region for light among Figure 11.
Embodiment
As shown in Figure 4, the optical read/write head of multi-wavelength disclosed according to the present invention carries out data access in order to the optical record medium 40 at least three kinds of different pieces of information storage densities, comprising: laser beam generation unit 10a, 10b, 10c; Light element 20 and light detect assembly 30.
Laser beam generation unit 10a, 10b, 10c are in order to produce the different wavelength of laser bundle, optical record medium 40 with access different pieces of information storage density, and wherein a laser beam generation unit 10c has the three light beam gratings 11 corresponding with it, with seeking the rail light beam so that the laser beam that laser beam generation unit 10c is produced forms.
Spectroscope 201a, 201b, 201c is double-colored spectroscope, be arranged in the optical path of read/write head in the heart, and correspond respectively to laser beam generation unit 10a, 10b, 10c, in order to laser beam generation unit 10a, 10b, the laser beam that 10c produced reflexes to the optical path center of following read/write head and advances, and make via 40 laser light reflected bundles of optical record medium and pass through, certainly, spectroscope 201a, 201b, 201c three is for each self-corresponding laser beam generation unit 10a, 10b, the different wave length laser beam that 10c produced can make its partial penetration and partial reflection, laser beam to other wavelength then can make it penetrate fully, and spectroscope 201a, 201b, 201c three is arranged on the supercentral mode of optical path of read/write head unfixing (the front and back order that is the three is unfixing), as long as spectroscope 201a, 201b, 201c three all can be with each self-corresponding laser beam generation unit 10a, 10b, the different wave length laser beam that 10c produced reflexes to collimation lens 202 and gets final product.
Diffraction optical assembly 203 is a kind of made diffraction component of liquid crystal material (LiquidCrystal Diffractive Optical Element that adopts; LCDOE), be arranged in the optical path of read/write head in the heart, with so that through the laser beam of collimation lens 202 and pass through via 40 laser light reflected bundles of optical record medium, diffraction optical assembly 203 surfaces have the various electrode design that the circular concentric lines distribute that are, and by the outside voltage of supply on electrode that switches, change laser beam the pore diameter range (the NA value of corresponding focusing objective len 204) that can pass through, and the refractive index of the liquid crystal molecule of periodicity modulation diffraction optical assembly 203 inside is (as Fig. 7 B, shown in the 7C), and then the diffraction characteristic of change diffraction optical assembly 203, substrate thickness with modifying factor optical record medium 40 changes caused sphere facial difference, therefore the different wavelength of laser bundle can form different angle of diffraction and diffracting effect, and after line focus object lens 204 focus on, changed the size of focal spot.
Focusing objective len 204 has the high-NA value, be arranged in the optical path of read/write head in the heart, with so that before passed through through the different wavelength of laser bundle of 203 diffraction of diffraction optical assembly, and focus on respectively on the data surface of optical record medium 40 of different pieces of information storage density of corresponding different wave length laser beam, and make via 40 laser light reflected bundles of optical record medium and pass through.
Light detects assembly 30 in order to receive the laser beam that reflects and contain the data-signal of record on the optical record medium 40 through the optical record medium 40 of cylindrical lens 205, and the light signal with this laser beam is converted to corresponding electric signal simultaneously.
As shown in Figure 5, when the optical record medium 41 of first kind of particular data storage density of read-write head accessing tool, but produce the laser beam L1 of these optical record medium 41 specific wavelengths of access earlier by laser beam generation unit 10a, then, by with the pairing spectroscope 201a of laser beam generation unit 10a with divergent laser beam L1 beam split, being reflected to the optical path center of following read/write head advances, convert the divergent laser beam L1 that spectroscope 201a is reflected to parallel beam by collimation lens 202 again, then, laser beam L1 is fully by diffraction optical assembly 203, and laser beam L1 is focused on the data surface (L1 as shown in Figure 6) of optical record medium 41 via focusing objective len 204, this moment, diffraction optical assembly 203 no external voltages were supplied on the electrode, so inner liquid crystal molecule refractive index does not change (shown in Fig. 7 A), be that diffraction optical assembly 203 does not have diffraction, subsequently, optical record medium 41 reflects focussed laser beam L1, and follow previous optical path to return, and penetrate spectroscope 201a, arrive cylindrical lens 205, and behind the formation focus error signal S1 (shown in Fig. 8 A), detect assembly 30 by light and receive, the light signal with laser beam L1 is converted to corresponding electric signal simultaneously.
And as shown in Figure 9, when the optical record medium 42 of second kind of particular data storage density of read-write head accessing tool, but produce the laser beam L2 (wavelength that is different from laser beam L1) of these optical record medium 42 specific wavelengths of access earlier by laser beam generation unit 10b, then, by with the pairing spectroscope 201b of laser beam generation unit 10b with divergent laser beam L2 beam split, being reflected to the optical path center of following read/write head advances, at this moment, laser beam L2 and laser beam L1 can merge the collimation lens 202 of passing through successively, diffraction optical assembly 203, focusing objective len 204, and laser beam L2 is focused on the data surface of optical record medium 42, subsequently, optical record medium 42 reflects focussed laser beam L2, and follow previous optical path to return, and penetrate spectroscope 201b, arrive cylindrical lens 205, and behind the formation focus error signal S2 (shown in Fig. 8 B), detect assembly 30 by light and receive, the light signal with laser beam L2 is converted to corresponding electric signal simultaneously.
The optical record medium 41 that access has first kind of particular data storage density is with the difference that access has the optical record medium 42 of second kind of particular data storage density, laser beam L2 is by diffraction optical assembly 203 time, diffraction optical assembly 203 is supplied voltage on first kind of electrode on diffraction optical assembly 203 surfaces because of the outside, can be thereby changed laser beam L2 by the pore diameter range (the NA value of corresponding focusing objective len 204) of diffraction optical assembly 203, and the refractive index that makes diffraction optical assembly 203 inner liquid crystal molecules is cyclical variation (shown in Fig. 7 B), therefore diffraction optical assembly 203 has diffraction, make laser beam L2 form diffraction phenomena (as the L2 of Fig. 6) by the back, and line focus object lens 204 focus on, formation is different from the focal spot of aforementioned laser bundle L1, has revised simultaneously because of the caused sphere of the substrate thickness of optical record medium 42 to differ.
In addition, as shown in figure 10, when the optical record medium 43 of the third particular data storage density of read-write head accessing tool, but elder generation (is different from laser beam L1 by the laser beam L3 that laser beam generation unit 10c produces the specific wavelength of this optical record medium 43 of access, the wavelength of L2), and form by three light beam gratings 11 and to seek the rail light beam, then, by with the pairing spectroscope 201c of laser beam generation unit 10c with divergent laser beam L3 beam split, and be reflected to the optical path center of following read/write head and advance, at this moment, laser beam L3 and laser beam L1, L2 can merge successively by collimation lens 202, diffraction optical assembly 203, focusing objective len 204, and laser beam L3 is focused on the data surface of optical record medium 43, subsequently, optical record medium 43 reflects focussed laser beam L3, and follow previous optical path to return, and penetrate spectroscope 201c, arrive cylindrical lens 205, and behind the formation focus error signal S3 (shown in Fig. 8 C), detect assembly 30 by light and receive, the light signal with laser beam L3 is converted to corresponding electric signal simultaneously.
Access has first, the optical record medium 41 of two kinds of particular data storage densities, 42 are with the difference of the optical record medium 43 of the third particular data storage density of access tool, laser beam L3 is by diffraction optical assembly 203 time, diffraction optical assembly 203 is supplied voltage on second kind of electrode on diffraction optical assembly 203 surfaces because of the outside, can be thereby changed laser beam L3 by the pore diameter range (the NA value of corresponding focusing objective len 204) of diffraction optical assembly 203, and the refractive index that makes diffraction optical assembly 203 inner liquid crystal molecules is cyclical variation (shown in Fig. 7 C), therefore diffraction optical assembly 203 has diffraction, make laser beam L3 form the diffraction phenomena (as the L3 of Fig. 6) different with laser beam L2 by the back, and line focus object lens 204 focus on, formation is different from aforementioned laser bundle L1, the focal spot of L2 has been revised simultaneously because of the caused sphere of the substrate thickness of optical record medium 43 and has been differed.
Therefore, when practical application is of the present invention, above-mentioned read/write head can see through laser beam generation unit 10a, 10b, it is 405nm that 10c produces wavelength respectively, 650nm, the laser beam L1 of 780nm, L2, L3, and these three kinds of laser beam are advanced directly to penetrate or to penetrate the diffracted mode in back by diffraction optical assembly 203, and focus on by focusing objective len 204 that to become corresponding to focusing objective len 204NA value be 0.7-0.9,0.6 and 0.45 optically focused focus, access has three kinds of different pieces of information storage densities and thickness is respectively 0.1-0.6mm respectively, 0.6mm and the optical record medium 40 of 1.2mm (novel optical recording medium just, three kinds of DVD and CD).In addition, can also produce the optical record medium 40 of the laser beam of other kind wavelength with other kind of access different pieces of information storage density, just the wavelength of above-mentioned laser beam L1, L2, L3 just is not defined as above-mentioned 405nm, 650nm, 780nm at this moment, and can change to the laser beam of other kind wavelength according to demand, and the NA value of focusing objective len 204 is not defined as above-mentioned 0.7-0.9,0.6 and 0.45 3 kind yet.
As Figure 11, Figure 12 and shown in Figure 13, another embodiment of the present invention is above-mentioned laser beam generation unit 10a, 10b, 10c merges into a generation unit 10 that can produce multi-wavelength's laser beam, promptly this multiwavelength laser bundle generation unit 10 can be with three different laser diode 50,50 ', 50 " optionally produce three road different wavelength of laser bundles (L1; L2; L3); and be same as the light element 20 of previous embodiment and the configuration that light detects assembly 30; but make the optical record medium of three kinds of different pieces of information storage densities of read/write head access, have three laser beam (L1; L2 but the light of this embodiment detects assembly 30, L3) be subjected to light detection area 31,31 ', 31 " (respectively be divided into four regional A1; B1; C1; D1; A2, B2, C2, D2 and A3, B3, C3, D3), to detect the three road different wavelength of laser bundles (L1, L2, L3) that multiwavelength laser bundle generation unit 10 is produced respectively, and have track-seeking signal detection region 311,311 ' in the both sides of detection region 31, in order to produce track-seeking signal.In addition, in order to cooperate this embodiment to implement, spectroscope 201a, 201b in the light element 20,201c can replace with single spectroscope 201, and the laser beam of specific wavelength separately (L1, L2, L3) all can be reflected to the optical path center of following read/write head and advance when passing through spectroscope 201.
Certainly, set laser beam generation unit does not limit and only has three in the optical read/write head, and it is extendible for more than at least three, and the different wavelength of laser bundle that multiwavelength laser bundle generation unit 10 is produced is also extendible for more than at least three roads, carries out access with the optical record medium to multiple different pieces of information storage density.
Multi-wavelength optical read-write head of the present invention, because of having a plurality of (more than at least three) laser beam generation unit multiple to produce (more than at least three kinds) different wavelength of laser bundle, and collocation liquid crystal diffraction optical module makes focusing objective len have multiple (more than at least three kinds) different N A value, and has extendibility, but so optical record medium of access multiple (more than at least three kinds) different pieces of information storage density, and, and make optical read/write head have simple structure because of its special optical path design.
The above; only be the present invention's preferred embodiment wherein; be not to be used for limiting practical range of the present invention; protection scope of the present invention should be as the criterion with the scope that accompanying claims define; equivalent variations and remodeling that all utilizations instructions of the present invention and accompanying drawing content are done all should be contained within the appending claims restricted portion.
Claims (14)
1. a multi-wavelength optical read-write head carries out data access in order to the optical record medium to the different pieces of information storage density, and this read/write head comprises:
At least three above laser beam generation units are in order to produce the different wavelength of laser bundle;
One light element, be configured in the center of this read/write head optical path, in order to guide this laser beam, and after focusing on the data surface of this optical record medium, and by of the laser beam reflection of this optical record medium with the recorded data signal, and this light element comprises a diffraction optical assembly and a focusing objective len, wherein this diffraction optical assembly is in order to change the pore diameter range that this laser beam can be passed through, and after making this laser beam of different wave length form different angle of diffraction and diffracting effect, through this focusing objective len, will focus on the data surface of this optical record medium of corresponding different pieces of information storage density again through this laser beam of diffraction; And
One light detects assembly, in order to being received from this optical record medium institute laser light reflected bundle, and the light signal of this laser beam is converted to corresponding electric signal.
2. multi-wavelength optical read-write head as claimed in claim 1, wherein this laser beam generation unit also comprises the three light beam gratings corresponding with it, seeks the rail light beam in order to formation.
3. multi-wavelength optical read-write head as claimed in claim 1, wherein this light element also comprises:
At least three above spectroscopes, be arranged in the optical path of this read/write head in the heart, and correspond respectively to laser beam generation unit separately, in order to each self-corresponding laser beam beam split and the laser beam of other wavelength is penetrated, and this laser beam of part reflexes to the optical path center of following this read/write head and advances, and makes via this laser beam of this optical record medium reflection and pass through; And
One collimation lens, be arranged in the optical path of this read/write head in the heart, in order to convert this laser beam of dispersing that this spectroscope reflected to parallel beam, and treat that this laser beam passes through behind this diffraction optical assembly and this focusing objective len, this laser beam that reflects via this optical record medium is passed through.
4. multi-wavelength optical read-write head as claimed in claim 1, wherein this focusing objective len is the object lens with high-NA value.
5. multi-wavelength optical read-write head as claimed in claim 1, wherein this light element also comprises the supercentral cylindrical lens of the optical path that is arranged on this read/write head, with so that this optical record medium reflected contains on it this laser beam of recorded data signal and pass through, and form focus error signal.
6. multi-wavelength optical read-write head as claimed in claim 1, wherein this diffraction optical assembly is for adopting the made diffraction component of liquid crystal material.
7. multi-wavelength optical read-write head as claimed in claim 6, wherein this diffraction optical assembly has at least more than the two arrays of electrodes, each is organized electrode and becomes the circular concentric lines to distribute, switch the voltage of supply by the outside at this group electrode, and change the pore size that this laser beam is passed through, make the refractive index of liquid crystal molecule be cyclical variation simultaneously, thereby this diffraction optical assembly can make this laser-beam diffraction, and change the NA value of this focusing objective len, and revise the sphere of being introduced when this optical record medium thickness is changed and differ.
8. the optical read/write head of a multi-wavelength carries out data access in order to the optical record medium to the different pieces of information storage density, and this read/write head comprises:
One multiwavelength laser bundle generation unit is in order to optionally to produce the above different wavelength of laser bundle at least three roads;
One light element, be configured in the optical path of this read/write head in the heart, advance in order to guide this laser beam, and focus on the data surface of this optical record medium, this laser beam reflection of the data-signal that will contain on it to be noted down by this optical record medium, and this light element comprises a diffraction optical assembly and a focusing objective len, wherein this diffraction optical assembly is in order to change the pore diameter range that this laser beam can be passed through, and after this laser beam that makes different wave length forms different angle of diffraction and diffracting effect, again through this focusing objective len, will focus on the data surface of this optical record medium of corresponding different pieces of information storage density through this laser beam of diffraction; And
One light detects assembly, have at least three above detection region corresponding to this laser beam of different wave length, receive this laser beam that contains recorded data signal on the medium that this optical record medium reflects in this detection region, and transmitting photo-signal is corresponding electric signal.
9. multi-wavelength optical read-write head as claimed in claim 8, wherein this multiwavelength laser bundle generation unit also comprises the three light beam gratings corresponding with this laser diode, seeks the rail light beam in order to formation.
10. multi-wavelength optical read-write head as claimed in claim 8, wherein this light element also comprises:
One spectroscope, be arranged in the optical path of this read/write head in the heart, and this laser beam of being sent corresponding to this multiwavelength laser bundle generation unit, in order to this laser beam beam split, and this laser beam of part reflexes to the optical path center of following this read/write head and advances, and makes via this laser beam of this optical record medium reflection and pass through;
One collimation lens, be arranged in the optical path of this read/write head in the heart, in order to convert this laser beam of dispersing that this spectroscope reflected to parallel beam, and treat that this laser beam passes through behind this diffraction optical assembly and this focusing objective len, this laser beam that reflects via this optical record medium is passed through.
11. multi-wavelength optical read-write head as claimed in claim 8, wherein this focusing objective len is the object lens with high-NA value.
12. multi-wavelength optical read-write head as claimed in claim 8, wherein this light element also comprises the supercentral cylindrical lens of the optical path that is arranged on this read/write head, with so that this optical record medium reflected contains on it this laser beam of recorded data signal and pass through, and form focus error signal.
13. multi-wavelength optical read-write head as claimed in claim 8, wherein this diffraction optical assembly is for adopting the made diffraction component of liquid crystal material.
14. multi-wavelength optical read-write head as claimed in claim 13, wherein this diffraction optical assembly has at least more than the two arrays of electrodes, respectively this group electrode becomes the circular concentric lines to distribute, switch the voltage of supply by the outside at this group electrode, thereby change the pore size that laser beam is passed through, make the refractive index of liquid crystal molecule be cyclical variation simultaneously, thereby this diffraction optical assembly can make this laser-beam diffraction, and change the NA value of this focusing objective len, and revise the sphere of being introduced when this optical record medium thickness is changed and differ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100105 CN1430219A (en) | 2002-01-04 | 2002-01-04 | Multi-wavelength optical read and write head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100105 CN1430219A (en) | 2002-01-04 | 2002-01-04 | Multi-wavelength optical read and write head |
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| CN1430219A true CN1430219A (en) | 2003-07-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401110C (en) * | 2004-09-22 | 2008-07-09 | 华硕电脑股份有限公司 | Optical component set used for optical read write head and its manufacturing method |
| US7602691B2 (en) | 2004-07-27 | 2009-10-13 | Koninklijke Philips Electronics N.V. | Diffractive part |
-
2002
- 2002-01-04 CN CN 02100105 patent/CN1430219A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7602691B2 (en) | 2004-07-27 | 2009-10-13 | Koninklijke Philips Electronics N.V. | Diffractive part |
| CN100401110C (en) * | 2004-09-22 | 2008-07-09 | 华硕电脑股份有限公司 | Optical component set used for optical read write head and its manufacturing method |
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