CN1266260A - Optical combination device for reading/writing digital colour multi-layer n-order CD - Google Patents
Optical combination device for reading/writing digital colour multi-layer n-order CD Download PDFInfo
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- CN1266260A CN1266260A CN 00103231 CN00103231A CN1266260A CN 1266260 A CN1266260 A CN 1266260A CN 00103231 CN00103231 CN 00103231 CN 00103231 A CN00103231 A CN 00103231A CN 1266260 A CN1266260 A CN 1266260A
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Abstract
The present invention relates to a phot0-synthesizer device for reading and writing digital colour multi-layer and multi-order CD, including laser and phot-synthesizer, said photo-synthesizer is formed from collimating lens and phot-synthesizing prism, and said invented photo-synthesizer device is characterized by that the light emitted from laser is passed through the collimating lens, and sent out from another face of photo-synthesizing prism to form coaxial parallel beams, and these multi-wavelength coaxial parallel beams are used for reading and writing colour multi-layer multi-order CD. Said invention implements multi-beam surface coupling, and provides effective light source for high-speed reading and writing colour digital multi-layer multi-order CD, and can greatly raise storage capacity of CD and signal reading and writing speed.
Description
The present invention relates to a kind of Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write, belong to the design field of CD player, particularly the structural design of colorful digital multiplayer optical disk optical head.
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.Its read-write principle is shown in figure one, and laser instrument 1 sends single wavelength light beam through 2 one-tenth parallel beams of collimation lens, and directive polarization spectroscope 3 through quarter wave plate 4 directive object lens 5, focuses on light beam on CD 6 read/write surface for read.Return along former road through object lens 5, quarter wave plate 4 directive polarization spectroscopes 3 through the folded light beam of read/write surface for read, folded light beam focuses on light beam on the photodetector 8 through convergent lens 7.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.
The objective of the invention is to design a kind of Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write, its related colored multilayer CD is different from existing DVD CD at aspects such as dish structure and signal storage principles.The DVD CD uses single beam serial read-write and the Multiplexing apparatus of design can carry out concurrent reading and concurrent writing to colour multi-layer multi-stage optical disk, effectively improves data of optical disk read-write speed and memory capacity.
The Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write of the present invention's design has three kinds of structures, and first kind of Multiplexing apparatus wherein comprises laser instrument and splicer, and splicer is made up of collimation lens and light-combining prism, and the drift angle of light-combining prism is an acute angle; Laser instrument and collimation lens have a plurality of respectively, and each laser instrument is positioned on the focus of each self-focus lens; Collimation lens places between laser instrument and the light-combining prism, the light that is sent by laser instrument enters the same side of light-combining prism respectively with different incident angles behind the collimation lens collimation, multi-beam penetrates the coaxial parallel beam of back one-tenth from the another side of light-combining prism, and the coaxial parallel beam of multi-wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
Another kind of structure comprises laser instrument and draws together splicer that described splicer is made up of collimation lens and two isosceles right-angle prisms; Described laser instrument has four, and the optical axis of four laser light sources is vertical mutually, and locates same plane; Described collimation lens has four, and four laser instruments lay respectively on the focus of four collimation lenses; Isosceles right-angle prism has two, the size difference, the mutual alignment of two isosceles right-angle prisms is: a right angle face of little prism and the inclined-plane of big prism coincide or are separated with the gap, another right angle face of little prism parallels with the drift angle crest line of big prism, right-angle prism places in the middle of four laser instruments, make the inclined-plane vertical incidence of wherein a branch of light from big prism, a branch of light is from the inclined-plane incident of little prism, big two orthogonal right angles of prism face is positioned on the intersection point of other two bundle light, light beam penetrates into the coaxial directional light of four wavelength from another right angle face of little prism, and the coaxial parallel beam of four wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
The third structure comprises laser instrument and splicer, described splicer is that the isosceles trapezoid prism that 45 ° parallelogram prism and base angle are 45 ° constitutes by a collimation lens, isosceles right-angle prism, interior angle, the mutual alignment of three prisms is: a right-angle side of isosceles right-angle prism and the minor face of parallel quadrant prism coincide, and hypotenuse is vertical with long limit; A waist of another minor face of parallelogram prism and isosceles trapezoid prism is in the same plane, and the long limit of the base of isosceles trapezoid prism and parallel quadrant prism intersects 90 °; Collimation lens is positioned at the outside of another waist of isosceles trapezoid prism, described laser instrument has four, optical axis is parallel to each other, and optical axis distance equates and be positioned at same plane, and middle two-beam is injected on the waist of the minor face that is positioned at conplane parallelogram prism and isosceles trapezoid prism; The two-beam of outside is injected respectively on the long limit of the upper base of isosceles trapezoid prism and parallel quadrant prism, four bundle light are through behind each prism, penetrate from another waist of isosceles trapezoid prism, be emitted as the coaxial directional light of four wavelength through the collimation lens collimation, the coaxial parallel beam of four wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
The present invention has realized multiple beam surface coupling, for vertical parallel high-speed reading and writing of colorful digital multi-layer multi-stage optical disk provide efficient light sources.Use this multi-wavelength coaxial beam concurrent reading and concurrent writing colored multilayer CD and can increase substantially the memory capacity of CD and the reading and writing speed of signal.
Brief Description Of Drawings:
Fig. 1 is present CD read and write principle schematic.
Fig. 2 is a digital colour multi-layer multi-stage optical disk read-write principle schematic of the present invention.
A kind of structural representation of the Multiplexing apparatus that is used for digital colour multi-layer multi-stage optical disk read-write that Fig. 3 designs for the present invention.
Fig. 4 is the another kind of structural representation of the Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write of design of the present invention.
Another structural representation of the Multiplexing apparatus that is used for digital colour multi-layer multi-stage optical disk read-write that Fig. 5 designs for the present invention.
Describe the present invention in detail below in conjunction with accompanying drawing and read and write principle and embodiment:
Among Fig. 1-Fig. 5, the 1st, laser instrument, the 2nd, collimation lens, the 3rd, polarization splitting prism, the 4th, quarter wave plate, the 5th, achromatic objective, the 6th, CD, the 7th, imaging len, the 8th, detector, the 9th, multiwave length spectro detector, the 10th, colour multi-layer multi-stage optical disk, the 11st, laser instrument, the 12nd, splicer, the 13rd, collimation lens, the 14th, light-combining prism, the 15, the 16th, isosceles right-angle prism, the 17th, quadrant prism, the 18th, isosceles right-angle prism, the 19th, isosceles trapezoid prism.
As shown in Figure 2, the recording layer of disc is made of the colored multilayer deielectric-coating, respectively by different wavelength read-writes.By Fig. 2 the read-write principle is described, λ i (the i=1 that sends by N laser instrument 11,2, n) wavelength multiple beam, penetrate the coaxial parallel beam of multi-wavelength λ i through multiple beam surface coupling splicer 12, after the transmission of polarization splitting prism 3, quarter wave plate 4 and achromatic objective 5, focus on the colored multilayer medium face of CD 10 (physical size and DVD compatibility), the colored multilayer dielectric thickness is less than the depth of focus of achromatic objective 5.Because plating total reflection layer in the CD media layer outside arrives on the multiwave length spectro detector 9 after achromatic objective 5, quarter wave plate 4, polarization splitting prism 3 reflections from the colour signal of reflective layer reflects light after dielectric layer absorbs.Through multiwave length spectro detector 9 effect, each colour signal light on optoelectronic receiver separately, is taken out the signal of each aspect of CD with the different angles imaging by optoelectronic receiver.When writing N laser instrument of control respectively write light intensity Ii, Ii writes light intensity Ii and follows the data variation that writes greater than respectively writing threshold value Iwi and sublevel, so just can realize vertically being written in parallel to of colored multilayer dish data; When reading, read light intensity IRi, and IRi does not change in time, can take out the signal of each dielectric layer, so just can realize vertical parallel read-out of colored multilayer dish data from receiver much smaller than Iwi.In order to realize the vertically parallel reading and writing of colored multilayer CD, existing dvd pickup header structure can not meet the demands.Purpose of the present invention is exactly to be coupled and to realize parallel reading and writing to the colored multilayer signal by increasing disc color layer and multi-wavelength light beam.Thereby effectively improve optical disc information read-write speed and memory capacity.By existing DVD coded system, colored multilayer CD concurrent reading and concurrent writing speed is the Nlog of existing DVD CD
2M times, and memory capacity is NDlog
2M doubly.Wherein, N is the number of plies, and M is an exponent number, and D is existing single face DVD data of optical disk capacity.
The present invention is the Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write, is divided into dispersing prism coupling, the coupling of right-angle prism group and polygon prism group according to multi-wavelength light beam coupling scheme and is coupled three kinds.
The light-combining prism constructional device of first kind of design as shown in Figure 3.
N semiconductor laser array 11 is in same vertical plane, a plurality of light beams of emission, through separately 13 one-tenth parallel beams of collimation lens and incide with different incidence angles on the same position of light-combining prism 14 planes of incidence 141, angle is between 10 ° to 70 ° between the plane of incidence 141 of light-combining prism 14 and the exit facet 142, and the light action that closes of ECDC light prism makes each light beam be overlapped into coaxial directional light ejaculation.The coaxial directional light that penetrates is vertical with dispersing prism 14 exit facets 142.In order to reach this purpose, according to the anaclasis dispersion theory, rationally arrange the incident angle of each laser beam, and incide prism surface after need making each light beam become directional light with micro collimating lens 13.Usually need be integrated in the semiconductor laser of emission different wave length on the same chip, distance between the laser instrument and laser beam transmit direction should satisfy the coupling requirement.Select the big prism material of abbe number.Prism structure and semiconductor laser integrated morphology can have different modes.In order to reduce optical energy loss, each logical optical surface of prism will plate the polychrome anti-reflection film.Since the recording medium difference of colored multilayer CD, the wavelength difference of use, and so the incident angle difference of each wavelength, incident angle is calculated according to prism material, drift angle and wavelength.
Four light beam right-angle prism group coupled structure devices of second kind of design as shown in Figure 4.
This structure is by 11, four collimation lenses 13 of four laser instruments, and isosceles right- angle prism 15,16 is formed.The size of isosceles right-angle prism 15 is 1/2nd of isosceles right-angle prism 16 sizes.Four laser instruments 11 lay respectively on the focus of four collimation lenses 13, and isosceles right- angle prism 15,16 forms by optical contant shown in the figure four.Light beam does not have optical energy loss by the optical contant face.Four laser instruments 11 are restrainted parallel beam for 13 one-tenth four through collimation lens separately and are penetrated.Siping City's row light beam coplane and vertical mutually.Wherein a branch of directional light impinges perpendicularly on the inclined-plane 161 of right-angle prism 16, and isosceles right- angle prism 15,16 other planes of incidence 151,163,162 lay respectively on other three beams parallel beam intersection point, shown in figure four.Through the light action that closes of isosceles right- angle prism 15,16, penetrate the coaxial directional light of four wavelength from exit facet 152.Should be used for read-write by synthetic parallel beam.The reflecting surface of isosceles right- angle prism 15,16 will plate monochrome or the polychrome film that is all-trans, transmission plane plating anti-reflection film.Four collimation lenses 13 and isosceles right- angle prism 15,16 can be with integrated method of optics manufacturings, or use the mold pressing manufacturing, to reduce the optical head volume and weight.
Four light beam prism group coupled structure devices of the third design as shown in Figure 5.
This constructional device is made up of four laser instruments 11, parallelogram prism 17, isosceles right-angle prism 18, isosceles trapezoid prism 19 and collimation lens 13.Isosceles trapezoid prism 19 base angles are 45 °, and an interior angle of parallelogram prism 17 is 45 °, and the position of each element is placed as follows: isosceles right-angle prism 18 forms by optical contant shown in the figure five with parallel quadrant prism 17, and light beam does not have optical energy loss through the optical contant face; The plane of incidence 171 coplanes of the plane of incidence 191 of isosceles trapezoid prism 19 and parallel quadrant prism 17, face 171 overlaps with the crest line of face 194 with the crest line and the face 191 of face 173; Collimation lens 13 is positioned at the outside of isosceles trapezoid prism 19 exit facets 193; Four laser instruments 11 lay respectively on the focus of collimation lens 13.Four laser instruments 11 send the axis coplane of light beam and are parallel to each other, and its spacing equates.The axis light that two middle laser instruments send impinges perpendicularly on the plane of incidence 171 of parallelogram prism 17 respectively and on the plane of incidence 191 of isosceles trapezoid prism 19.Each incidence point is shown in figure five.Through the saturating retroaction of parallelogram prism 17, right-angle prism 18 and isosceles trapezoid prism 19, the non-axis light of four bundles is coupled into the multi-wavelength axis light, vertically penetrate from exit facet 193, penetrate the coaxial parallel beam of multi-wavelength through collimation lens 13 and be used for read-write.The reflecting surface of each prism will plate monochrome or the polychrome film that is all-trans, transmission plane plating anti-reflection film.Collimation lens and each prism can or be used the mold pressing manufacturing with integrated method of optics manufacturing, to reduce the optical head volume and weight.
The embodiment of the invention adopts the general structure of the two-sided 8 layers of colour multi-layer multi-stage optical disk concurrent reading and concurrent writing in 4 wavelength, 4 rank as shown in Figure 2.Handled by controller, wherein a branch of light carries out addressing, tracks, focuses and has concurrently read-write capability, and other light beam is read and write.The read-write one side is read and write another side again.Laser instrument 11 sends four light beams that wavelength is 780nm, 650nm, 550nm, 480nm respectively.The light beam of wavelength 650nm is as the addressing light beam.The Multiplexing apparatus of each light beam through being used for digital colour multi-layer multi-stage optical disk read-write is coupled into coaxial beam, and coaxial beam is through polarization spectroscope 4 and quarter wave plate 5, is that 0.6 achromatic objective 6 focuses on the recording dielectric layer of CD 10 through numerical aperture again; Focused beam returns along former road after the disc reflective layer reflects, and through achromatic objective 6, quarter wave plate 5 and polarization spectroscope 4, polarization spectroscope 4 reflexes to four light beams with the multi-wavelength coaxial beam and divides on the light detection device 9.Read and write according to aforementioned principles.The Multiplexing apparatus of reading and writing colour multi-layer multi-stage optical disk is in the present embodiment selected any one in above-mentioned three kinds of optical coupling structure devices for use.When using first kind of dispersing prism Multiplexing apparatus, dispersing prism material selection dense flint glass ZK14, drift angle is 30 °.780nm, 650nm, 550nm, the formed parallel beam of 480nm wavelength, respectively with 71 ° 9 of incident angle ', 72 ° 19 ', 74 ° 32 ' 26 ", 77 ° 16 ' 8 " incide to close the optical dispersion prism and form the coaxial parallel beam of multi-wavelength and enter system.
According to present DVD coded format record data, 4 layers of polychrome media disk of 4 wavelength, 4 rank single faces concurrent reading and concurrent writing memory capacity is up to more than the 35Gb, and the two-sided 8 layers of polychrome media disk concurrent reading and concurrent writing memory capacity in 4 wavelength, 4 rank are up to more than 70 Gb.If adopt new interlayer coded system, also can reduce redundant data, memory capacity also can further improve.
Claims (3)
1, a kind of Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write comprises laser instrument, it is characterized in that also comprising splicer, and described splicer is made up of collimation lens and light-combining prism, and the drift angle of light-combining prism is an acute angle; Laser instrument and collimation lens have a plurality of respectively, and each laser instrument is positioned on the focus of each self-focus lens; Collimation lens places between laser instrument and the light-combining prism, the light that is sent by laser instrument enters the same side of light-combining prism respectively with different incident angles behind the collimation lens collimation, multi-beam penetrates the coaxial parallel beam of back one-tenth from the another side of light-combining prism, and the coaxial parallel beam of multi-wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
2, a kind of Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write comprises laser instrument, it is characterized in that also comprising splicer, and described splicer is made up of collimation lens and two isosceles right-angle prisms; Described laser instrument has four, and the optical axis of four laser light sources is vertical mutually, and locates same plane; Described collimation lens has four, and four laser instruments lay respectively on the focus of four collimation lenses; Isosceles right-angle prism has two, the size difference, the mutual alignment of two isosceles right-angle prisms is: a right angle face of little prism and the inclined-plane of big prism coincide or are separated with the gap, another right angle face of little prism parallels with the drift angle crest line of big prism, right-angle prism places in the middle of four laser instruments, make the inclined-plane vertical incidence of wherein a branch of light from big prism, a branch of light is from the inclined-plane incident of little prism, big two orthogonal right angles of prism face is positioned on the intersection point of other two bundle light, light beam penetrates into the coaxial directional light of four wavelength from another right angle face of little prism, and the coaxial parallel beam of four wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
3, Multiplexing apparatus that is used for the digital colour multi-layer multi-stage optical disk read-write, comprise laser instrument, it is characterized in that also comprising splicer, described splicer is that the isosceles trapezoid prism that 45 ° parallelogram prism and base angle are 45 ° constitutes by a collimation lens, isosceles right-angle prism, interior angle, the mutual alignment of three prisms is: a right-angle side of isosceles right-angle prism and the minor face of parallel quadrant prism coincide, and hypotenuse is vertical with long limit; A waist of another minor face of parallelogram prism and isosceles trapezoid prism is in the same plane, and the long limit of the base of isosceles trapezoid prism and parallel quadrant prism intersects 90 °; Collimation lens is positioned at the outside of another waist of isosceles trapezoid prism, described laser instrument has four, optical axis is parallel to each other, and optical axis distance equates and be positioned at same plane, and middle two-beam is injected on the waist of the minor face that is positioned at conplane parallelogram prism and isosceles trapezoid prism; The two-beam of outside is injected respectively on the long limit of the upper base of isosceles trapezoid prism and parallel quadrant prism, four bundle light are through behind each prism, penetrate from another waist of isosceles trapezoid prism, be emitted as the coaxial directional light of four wavelength through the collimation lens collimation, the coaxial parallel beam of four wavelength is used for the read-write of colour multi-layer multi-stage optical disk.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00103231 CN1106009C (en) | 2000-03-17 | 2000-03-17 | Optical combination device for reading/writing digital colour multi-layer n-order CD |
| 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 |
|---|---|---|---|
| CN 00103231 CN1106009C (en) | 2000-03-17 | 2000-03-17 | Optical combination device for reading/writing digital colour multi-layer n-order CD |
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| Publication Number | Publication Date |
|---|---|
| CN1266260A true CN1266260A (en) | 2000-09-13 |
| CN1106009C CN1106009C (en) | 2003-04-16 |
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|---|---|---|---|
| CN 00103231 Expired - Fee Related CN1106009C (en) | 2000-03-17 | 2000-03-17 | Optical combination device for reading/writing digital colour multi-layer n-order CD |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555998A (en) * | 2018-12-07 | 2019-04-02 | 珠海博明视觉科技有限公司 | A kind of planar coaxial light source |
-
2000
- 2000-03-17 CN CN 00103231 patent/CN1106009C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555998A (en) * | 2018-12-07 | 2019-04-02 | 珠海博明视觉科技有限公司 | A kind of planar coaxial light source |
| CN109555998B (en) * | 2018-12-07 | 2024-02-13 | 珠海博明视觉科技有限公司 | Plane coaxial light source |
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| CN1106009C (en) | 2003-04-16 |
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