CN1270388A - 3D multi-colour storing optical head - Google Patents
3D multi-colour storing optical head Download PDFInfo
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- CN1270388A CN1270388A CN00109128A CN00109128A CN1270388A CN 1270388 A CN1270388 A CN 1270388A CN 00109128 A CN00109128 A CN 00109128A CN 00109128 A CN00109128 A CN 00109128A CN 1270388 A CN1270388 A CN 1270388A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 17
- 239000006185 dispersion Substances 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Abstract
A 3D multi-colour storing optical head is composed of light gathering unit, reflector, colour difference eliminating object lens and light splitter. Said light gathering unit consists of laser, directional optical coupler and optical fibre for connecting them. Said light splitter is composed of holographic concave diffraction raster and probe head. The emitted light beam is reflected by reflector and then passed through object lens to be focused onto raster on colour optical disk. The light beams in different wavelengthes are reflected to probe head. With said optical head,the multi-layer multi-stage colour optical disk can be read or written,so increasing its R/W speed and storage capacity.
Description
The present invention relates to a kind of 3 D multi-colour storing optical head, belong to the 3-dimensional digital field of optical storage technology.
Increasing and the access speed of the storage capacity requirement of information data requires more and more faster.Great majority adopt means such as CD server, CD tower and disk array aspect the vast capacity data access at present.And the data capacity of monolithic CD or disk is relatively little and access speed is slow relatively.Increasing monolithic optical disc storage dimension is to improve the effective ways of optical storage capacity, for example in digital multi-purpose disk (Digital Versatile Disc-DVD), four kinds of multilayer storage modes have been adopted, i.e. single-surface single-layer, single-surface double-layer, two-sided individual layer and two-sided bilayer.In commercial dvd pickup head, the reading and writing of optical disc information are that layering is carried out, and all adopt the single beam serial mode.It reads and writes principle as shown in Figure 1, and laser instrument sends single wavelength light beam and becomes parallel beam through collimation lens, and the directive polarization spectroscope through quarter wave plate directive object lens, focuses on light beam on the CD read and write face.Folded light beam through read/write surface for read is returned along former road through object lens, quarter wave plate directive polarization spectroscope, and folded light beam focuses on light beam on the photodetector through convergent lens.Read and write.Its shortcoming is as follows:
1, the DVD data of optical disk is write and series read-out by the single beam serial, and its read or write speed is difficult to improve.
2, at present because each recording layer of disc uses different saturating reflectance, and recording layer can only be accomplished two-layer, so be difficult to improve the storage dimension.Its memory capacity also is difficult to improve.
Need particularly point out, in system shown in Figure 1, laser instrument and photelectric receiver all adopt discrete component, therefore can not realize the multidiameter delay read functions.
In the 3 D multi-colour storage, can't adopt existing VCD and dvd pickup header structure, because there is following subject matter:
A. in the light path of Fig. 1, owing to be multi-wavelength's synthetic light, polarization spectroscope will all work to these light so, is very difficult.It is very high to produce this spectroscopical cost at present, and effect is also very bad.
B.1/4 wave plate has problems.In the ordinary optical head, a light with a kind of wavelength is so quarter wave plate can only work to this a kind of ripple.And the light of multi-wavelength existing problems just when this quarter wave plate.So will all play very difficult realization of effect of quarter wave plate to these synthetic light.
C. this structure can't be synthesized multi-wavelength's light and beam splitting, can't be applied in the middle of the reality at all.
In order to realize vertical parallel read-out of digital colour multi-layer multi-stage optical disk tracer signal, will close light and light-splitting processing to the composite light beam of colour signal, the applicant had once proposed to close the patented claim of light and beam-splitting structure, its application number is: 00103230.5, name is called " being used for the light-dividing device that the digital colour multi-layer multi-stage optical disk signal is read " and application number is 00103231.3, and name is called " being used for the Multiplexing apparatus that the digital colour multi-layer multi-stage optical disk signal is read ".Multiplexing apparatus wherein such as Fig. 2, light-dividing device such as Fig. 3.The Multiplexing apparatus of Fig. 2 uses dispersing prism, because the chromatic dispersion angle can not be very big, so when placing laser instrument in the practical application, or it is far away to leave dispersing prism, and perhaps the distance between the laser instrument is very near, and certain degree of difficulty is arranged.The light-dividing device of Fig. 3 also uses dispersing prism, same because chromatic dispersion angle problem, the placement of detector and laser instrument be placed with same problem.
The objective of the invention is to design a kind of 3 D multi-colour storing optical head,, design the optical head that a kind of new more practical 3 D multi-colour is stored, make its easy realization to realize the imprinting that 3 D multi-colour is stored and to read.
The 3 D multi-colour storing optical head of the present invention's design comprises splicer, reflective mirror, achromatic objective and optical splitter.Splicer is by laser instrument, and optical fiber and optical directional coupler are formed, and optical fiber links to each other laser instrument with optical directional coupler.Optical splitter is made up of holographic concave diffraction grating and detecting head.The emergent light of optical directional coupler is through focusing on the colored CD by achromatic objective behind the reflective mirror, owing to adopt achromatic objective, focusing on focus like this makes the bundle laser focusing of wavelength different wave length in same point, because a plurality of recording layers all are positioned within the object lens depth of focus, so different wavelength of laser can be absorbed by each recording layer respectively.After being absorbed, incide by object lens on the holographic concave diffraction grating through the light of the total reflection layer of colored CD reflection, the light with different wave length focuses on the detector head then.Detector can change the data of reading each recording layer according to the light intensity of surveying different wave length.
Characteristics of the present invention are:
(1) the exquisite photo structure that closes.
For can easily and light, and reduce the weight of shaven head, adopted directed fiber coupler here.By a plurality of laser instruments, the light of the different wave length that sends is imported by optical fiber, by optical directional coupler these different wave lengths photosynthetic is become a branch of light again.Because the loss of light wavelength difference and optical directional coupler luminous energy can some losses be arranged to luminous energy, but in shaven head, optical path distance is very short, so these losses are very little to the influence of system.And can Multiplexing apparatus and shaven head be separated according to actual conditions, the synthetic light of directional coupler is incorporated in the shaven head by optical fiber goes, can further reduce the weight of shaven head like this.
(2) the deflection incident of light and practical beam-splitting structure.
Consider the problem that adopts polarization spectroscope and quarter wave plate to exist, effectively separate incident light and reflected light, adopted the method for incident light deflection certain angle here.Only need the very little angle of deflection, just can effectively separate incident light with reflected light, also very little to the hot spot influence of reality like this.As shown in the figure, incident light deflection angle a focuses on the colored CD by condenser lens, reads.What incident light and reflected light were walked like this is not same light path just, so just can handle reflected light very easily.Consider practical application, divide the light time, should be as much as possible separately the light of different wave length, but also to allow photoimaging, adopted holographic concave grating as beam splitter here.Because holographic concave grating can arrive different points with the photoimaging of different wave length.The light of different wave length can be imaged onto different points by holographic concave grating like this, makes things convenient for detector to receive.Incident light is imaged onto on the detector by holographic concave grating.
Use this 3 D multi-colour storing optical head, can carry out concurrent reading and concurrent writing, effectively improve data of optical disk read-write speed and memory capacity colour multi-layer multi-stage optical disk.And be easy to obtain in actual applications promote, make product.
Description of drawings
Fig. 1 is existing VCD, dvd pickup head.
Fig. 2 is existing Multiplexing apparatus.
Fig. 3 is existing light-dividing device.
Fig. 4 is a 3 D multi-colour storing optical head synoptic diagram structure one of the present invention
Fig. 5 is a 3 D multi-colour storing optical head synoptic diagram structure two of the present invention
Describe in detail with regard to each structural representation below, among Fig. 1～Fig. 5:
The 1st, laser instrument, the 2nd, collimation lens, the 3rd, the deflection spectroscope, the 4th, quarter wave plate, the 5th, object lens, the 6th, CD, The 7th, convergent lens, the 8th, detector, the 11st, laser instrument, the 12nd, collimation lens, the 13rd, dispersing prism, the 14th, chromatic dispersion Prism, the 15th, convergent lens, the 16th, detector, 21～2n are laser instruments, 30～3n is optical fiber, the 41st, the directed coupling of light Close device, the 42nd, reflective mirror, the 43rd, the achromatic objective object lens, the 44th, color CD, the 45th, the concave surface holographic diffraction grating, 51～5n is detecting head, the 60th, and Multiplexing apparatus.
The 3 D multi-colour storing optical head of the present invention's design as shown in Figure 4, comprises splicer, reflective mirror 42, colour killing Difference object lens 43 and optical splitter. Splicer is made up of laser instrument 21～2n, optical fiber 30～3n and optical directional coupler 41, Optical fiber links to each other laser instrument with optical directional coupler. Optical splitter is by holographic concave diffraction grating 45 and detecting head 51～5n Form. The emergent light of optical directional coupler 41 focuses on color CD 44 by achromatic objective 43 behind reflective mirror 42 On owing to adopt achromatic objective, focus on focus like this so that the bundle Laser Focusing of wavelength different wave length in same point, Because a plurality of recording layers all are positioned within the object lens depth of focus, so the laser of different wave length can be inhaled by each recording layer respectively Receive. After being absorbed, incide holographic concave diffraction grating through the light of the total reflection layer of color CD reflection by object lens 43 On 45, then different wave length is focused on the detector head. Detector can be according to the different wave length that detects Light intensity changes the data of reading each recording layer.
Of the present invention can have two kinds of different structures, and first kind of structure as shown in Figure 4. Send different ripples by laser instrument Long light is by Optical Fiber Transmission, via the synthetic light beam of optical directional coupler. Synthetic light is by a facet reflection Mirror incides condenser lens with inclination angle a, read-write polychrome CD. Reverberation passes through condenser lens again by holographic concave light Grid are imaged onto on the detector. Structure is that the Multiplexing apparatus part is separated with optical head as shown in Figure 5 in second, and is synthetic Light is introduced optical head by optical fiber 30. Can further reduce like this weight of optical head.
9. embodiment
In the native system, use four kinds of different wavelength of laser, i.e. the laser instrument of 780nm, 650nm, 550nm, 480nm wavelength.Close light by optical fiber by optical directional coupler, it is that a incides condenser lens with the incident angle that synthetic light incides the facet catoptron.For catoptron and holographic concave grating is placed apart, specify its distance for d '=5mm, by formula d '=L ' * tg (2a), get L '=30mm, can obtain a=4.731 °.The holographic concave grating parameter of using is: sphere curvature radius R=125mm, concave grating diameter 5mm
2, wavelength band 400～800nm, the order of diffraction ± 1, incisure density N
0=1000l/mm.
Calculate by dispersion equation sinb+sini=N λ.Wherein i is the incident angle of light beam, i.e. the angle of incident light and holographic concave grating normal; B is the angle of diffracted beam and holographic concave grating normal.Can be calculated by above formula, be 15 when spending when being taken into firing angle i, and the dispersion angle b that is respectively the light beam of 780nm, 6500nm, 550nm, 480nm for wavelength is respectively: 31.412 degree, 23.028 degree, 16.929 degree, 12.778 degree; Distance L=the 10mm of imaging plan range incidence point.Then each distance between cells d of photodetector array is calculated by formula d=L * tg (Δ b), and wherein Ab is the poor of two adjacent wavelength diffraction of light deflection angles.The result of calculation of d is respectively: 1.474mm, 1.069mm～0.726mm.
Claims (1)
1, a kind of 3 D multi-colour storing optical head is characterized in that this optical head comprises splicer, reflective mirror, achromatic objective and optical splitter; Described splicer is by laser instrument, and optical fiber and optical directional coupler are formed, and optical fiber links to each other laser instrument with optical directional coupler; Described optical splitter is made up of holographic concave diffraction grating and detecting head; The emergent light of described optical directional coupler is through focusing on the colored CD by achromatic objective behind the reflective mirror, light through the reflection of the total reflection layer of colored CD incides on the holographic concave diffraction grating by object lens, light with different wave length focuses on the detector head then, and detector changes the data of reading each recording layer according to the light intensity of surveying different wave length.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00109128A CN1107945C (en) | 2000-06-09 | 2000-06-09 | 3D multi-colour storing optical head |
| US09/810,948 US20010038596A1 (en) | 2000-03-17 | 2001-03-16 | Multi-wavelength optical disc, apparatus and method for reading and writing signal therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00109128A CN1107945C (en) | 2000-06-09 | 2000-06-09 | 3D multi-colour storing optical head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1270388A true CN1270388A (en) | 2000-10-18 |
| CN1107945C CN1107945C (en) | 2003-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00109128A Expired - Fee Related CN1107945C (en) | 2000-03-17 | 2000-06-09 | 3D multi-colour storing optical head |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419874C (en) * | 2005-08-17 | 2008-09-17 | 上海理工大学 | Focusing method of oblique incidence multilayer optical disk |
| CN100442363C (en) * | 2005-08-17 | 2008-12-10 | 上海理工大学 | Multilayer optical disk focused oblique incidence Fuke prism method |
| CN101807013A (en) * | 2010-04-01 | 2010-08-18 | 上海理工大学 | System for monitoring minus one-level photoresist of holographic concave grating |
| CN106969843A (en) * | 2017-02-28 | 2017-07-21 | 上海理工大学 | Laser wavelength detection method |
| CN113939872A (en) * | 2019-05-21 | 2022-01-14 | 上海必修福企业管理有限公司 | Optical system and optical method |
-
2000
- 2000-06-09 CN CN00109128A patent/CN1107945C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419874C (en) * | 2005-08-17 | 2008-09-17 | 上海理工大学 | Focusing method of oblique incidence multilayer optical disk |
| CN100442363C (en) * | 2005-08-17 | 2008-12-10 | 上海理工大学 | Multilayer optical disk focused oblique incidence Fuke prism method |
| CN101807013A (en) * | 2010-04-01 | 2010-08-18 | 上海理工大学 | System for monitoring minus one-level photoresist of holographic concave grating |
| CN106969843A (en) * | 2017-02-28 | 2017-07-21 | 上海理工大学 | Laser wavelength detection method |
| CN113939872A (en) * | 2019-05-21 | 2022-01-14 | 上海必修福企业管理有限公司 | Optical system and optical method |
| CN113939872B (en) * | 2019-05-21 | 2024-01-30 | 上海必修福企业管理有限公司 | Optical system and optical method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1107945C (en) | 2003-05-07 |
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Granted publication date: 20030507 |