CN1441412A - Mother CD burning and making process for multiwavelength multistage read-only CD - Google Patents
Mother CD burning and making process for multiwavelength multistage read-only CD Download PDFInfo
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- CN1441412A CN1441412A CN03102682A CN03102682A CN1441412A CN 1441412 A CN1441412 A CN 1441412A CN 03102682 A CN03102682 A CN 03102682A CN 03102682 A CN03102682 A CN 03102682A CN 1441412 A CN1441412 A CN 1441412A
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Abstract
The present invention belongs to the fields of high density digital optical memory technology and fine machining technology, and features that by means of the selective absorption feature of record material, multiwavelength burning laser is used in parallel multichannel burning for multistage storing in eacy layer. The method includes the following steps: painting the glass base disc with photosensitive layer of photochromatic material mixture; performing multichannel paralell burning with multiwavelength burning laser through focusing complex achromatic object lens; recording date via altering the laser absorption to specific wavelength of the photochromatic material in the exposure area; fixing the photosensitive layer; painting one layer of transparent curing medium; stripping the curing medium layer and the photosensitive layer; and painting protecting layer to cnostitute the mask or mother disc.
Description
Technical field
The mother CD burning of multi-wavelength multistep read-only optical disk and manufacture method belong to high-density digital optical storage technology and Micrometer-Nanometer Processing Technology field.
Background technology
The Xu Duan of Tsing-Hua University chin or cheek waits in " Multi-wavelength Optical Disc Apparatus and Method forReading and Writing " a series of related invention patents such as (U.S. Patent number " 12000226E-US ") and scientific paper, the multistage optical storage method of a kind of multi-wavelength has been proposed, utilize the selection absorption characteristic of recording materials to light, realize frequency of light wave dimension concurrent reading and concurrent writing, each layer is gone up multistage storage simultaneously, has improved memory capacity and read or write speed simultaneously.The multistage optical storage of multi-wavelength is the advanced optical memory technology that further improves optical storage capacity under the constant situation of optical system numerical aperture and wavelength, and this technology can directly apply to multi-wavelength multistep read-only optical disk (as shown in Figure 1).The appearance of multi-wavelength multistep read-only optical disk has proposed new challenge to the mother CD burning technology.Existing mother CD burning technology has all adopted traditional hole point edge recording mode (as shown in Figure 2), and disc duplicates and then adopts mould pressing technology.This mold pressing type disc manufacturing process can't be applied to the manufacturing of multi-wavelength multistep read-only optical disk.
According to domestic and international result for retrieval, the article or the patent of the multistage stamper manufacture method of multi-wavelength do not proposed at present.
Summary of the invention
The objective of the invention is to propose a kind of for making mother CD burning and the manufacture method that the multi-wavelength multistep read-only optical disk is used, thereby realize paving the way for the industrialization of the multistage memory technology of multi-wavelength.
The invention is characterized in:
1, it is a kind of selection absorption characteristic of utilizing the recording materials correspondence, carries out the multidiameter delay imprinting with multi-wavelength imprinting laser, and the method for multistage storage on each layer, and it comprises following steps successively:
(1) photographic layer that is mixed by the multiple one to one photochromic material of multi-wavelength's laser is spun on the glass substrate, this photographic layer thickness is less than the depth of focus of used all laser.
(2) multi-wavelength's imprinting laser focuses on the same photographic layer by apochromatic objective, carries out the multidiameter delay imprinting.The focusing signal is that the reflected light from one road laser wherein detects and obtains.
(3) in the imprinting process, change the absorptivity of exposure area photochromic material to specific wavelength laser, and by the height sublevel of absorptivity with record data;
(4) after imprinting is finished photographic layer is fixed, made photosensitive material, improve photographic layer stability no longer to the imprinting laser-sensitive;
(5) fixedly finish after on photographic layer the curing medium layer of spin coating layer of transparent again; all are peeled off from glass substrate with curing medium layer and photographic layer to adopt separating technology then; get rid of on photographic layer then again and coat transparent protective seam, the mask that is made of curing medium layer, photographic layer and protective seam is the stamper that can be used for multi-wavelength multi-exponent read-only mother disc duplication process.
2, described change exposure area photochromic material is to realize by the exposure intensity that changes in the imprinting process to the absorptivity of specific wavelength laser.
Evidence: each photochromic material in the photographic layer can be stored multistage information, and photographic layer can be again to imprinting laser generation photochromic reactions after fixing.
Description of drawings:
Fig. 1: multi-wavelength multistep read-only optical disk structure diagram.
Fig. 2: the surface topography map that is used for the stamper (Stamper) of mold pressing DVD.
Fig. 3: the light path sketch of imprinting optical head.
Fig. 4: the laser instrument control principle sketch in the parallel photoetching of multilayer.
Fig. 5: the multistage stamper manufacture craft of multi-wavelength general flow chart.
In Fig. 1,11 is protective layer, and 12 is the reflecting layer, and 13 is information recording layer, and 14 are the dish base. Information recording layer is by many Plant (2 kinds, 3 kinds or 4 kinds) photochromic material and mix, wherein each photochromic material is only quick to a kind of wavelength Sense. Information recording layer shown in the figure namely is respectively λ by 3 kinds of absworption peaks1、λ
2、λ
3Photochromic material (be respectively material Material 1, material 2 and material 3) mix. The molecule of every kind of photochromic material has two states, and a kind of state only absorbs λ1The photon of wavelength does not absorb other two kinds of wavelength light, and another kind of state does not then absorb the laser of whole 3 kinds of wavelength; Material 2 one kinds of states only absorb λ2The photon of wavelength, another kind of state then do not absorb the laser of whole 3 kinds of wavelength; 3 one kinds of materials State only absorbs λ3Wavelength photon, another kind of state then do not absorb the laser of whole 3 kinds of wavelength. Every kind of photochromic material root According to the difference of light exposure, the molecular concentration that is in state 1 is also different, and is also different to the absorptivity of this wavelength. Utilize this point, Each material can realize storing multistage information. The information recording layer of multi-wavelength multistep read-only optical disk is at the duplication process quilt Forceful electric power or other method are fixed, and photochromic reactions can not take place again.
What be shown white ovals shape spot in Fig. 2 is the record symbol of projection, utilizes these projections, and the dish base that is molded will have The dimple-shaped record that coincide with stamper accords with.
In Fig. 3,31,34 and 39 is to have different wave length (λ1、λ
2、λ
3) 3 laser instruments, they are through separately Collimating and correcting system (32,35,310) and quarter wave plate (33,36,313) after, incide and close light/light-dividing device (314) After be synthesized and be a branch of coaxial directional light, pass through then apochromatic lens (315) after, focus on and treat imprinting stamper (316) On, spindle motor (317) drives treats that the imprinting stamper rotates. Polarization spectroscope (312), condenser (38) and photodetector (37) for detection of the reflective light intensity of laser 3, for generation of focussing error signal. During imprinting, according to the data letter that will write Breath is modulated the imprinting light intensity (the imprinting light intensity writes threshold value greater than each recording layer) of three laser instruments simultaneously by the intensity sublevel, like this Just can realize the vertically parallel imprinting of three layers of dish of three-wavelength data, data then are burnt at respectively on the different materials of this photosensitive layer.
As shown in Figure 4, coded system determines the power of corresponding laser instrument according to the data of the upper required record of every one deck of each record symbol And give corresponding 8 D/A circuit this watt level with the formal output of 8 bit digital quantity, 8 D/A circuit are converted into mould Plan amount (voltage) also is input to the power control circuit of corresponding laser instrument with the output intensity size of control laser instrument. Laser instrument goes out Roughly be directly proportional between the size of penetrating light intensity and the numerical value of record data, take into account simultaneously material susceptibility and focusing requirement. For example, Required storage three layer data of record symbol are followed successively by 01,02,03, and then power ratio control 1 is " 01000000 " (binary system), control Power 2 is " 10000000 ", and power ratio control 3 is " 11000000 ". Data 00 corresponding power ratio control is " 00000000 ", Because the blue light of wavelength 405nm needs to be used for simultaneously focusing, need to often open, so the data 00 corresponding power ratio control of recorded in blue layer Be not " 00000000 ", but one satisfied the value that focusing requires simultaneously less than the material threshold value, such as " 00011000 ".
In Fig. 5, I treats the imprinting disc for what is made up of photosensitive layer (51) and glass substrate (52), and II passes through imprinting to expose to the sun Disc behind light and the curing process (wherein 53 are the photosensitive layer after the exposure, i.e. Information Level), III is for coating cured layer (54) After disc, IV for and the disc that formed by cured layer and Information Level after separating of dish base, V is the dish of coating behind the protective layer (55) Sheet namely can be used for the stamper that the multi-wavelength multistep read-only optical disk copies.
The material of photosensitive layer is the same as with information recording/layer material in the multi-wavelength multistep read-only optical disk corresponding many of multi-wavelength's laser Plant photochromic material and mix, be spun on the glass substrate. This photosensitive layer thickness is less than the depth of focus of used all laser, with Guarantee that the recording materials of same record symbol are by corresponding laser uniform exposure.
The mother CD burning exposure process is to utilize photochromic effect, changes to be exposed the interior photochromic material in zone to specific wavelength The absorptivity of laser, and with the height sublevel of absorptivity with record data. After imprinting is finished photosensitive layer is fixed, makes sensitization Material improves photosensitive layer stability no longer to the imprinting laser-sensitive.
After fixedly finishing on photosensitive layer the curing medium layer of again spin coating layer of transparent, adopt then separating technology with the curing medium layer All are peeled off from glass substrate with photosensitive layer, on photosensitive layer, get rid of again then and coat transparent protective layer, by the curing medium layer, The mask that photosensitive layer and protective layer consist of is the stamper that can be used for multi-wavelength multi-exponent read-only mother disc duplication process.
Exposure intensity is more big in the imprinting process, and respective material is more little to the absorptivity of this wavelength in this zone, and this wavelength laser is at this The transmissivity of point is more big. Like this, the photosensitive layer take this stamper as mask to same material exposes, and just can obtain identical note The disc of record state.
Introduce embodiments of the invention below---three-wavelength quadravalence mother CD burning system.
Three kinds of optical maser wavelengths that adopt are respectively 650nm, 532nm and 405nm.Non-achromatic objective numerical aperture is 0.65, and depth of focus is 0.8 μ m.Optical disk substrate is made up of organic plastics, and thickness is 0.6mm.
Photographic layer is for to be mixed by 3 kinds of different spiro-pyrans of absorption band, and absorption peak is respectively 650nm, 532nm and 450nm, and the width of absorption band is very narrow.The molecular structure difference of photochromic material is little, except that the absorption peak difference, and other photochemical properties basically identical.
After imprinting is finished photographic layer is fixed, adopted the electric fixing means that adds highfield.At the curing medium layer of photographic layer spin coating layer of transparent again, after curing medium layer and photographic layer peeled off from glass substrate together, on photographic layer, get rid of the protective clear layer that is coated with again after fixedly finishing.The curing medium layer is identical with the material that protective seam adopts, and all is the protective layer material in the existing CD.The curing medium layer is much thicker relatively than protective seam, prevents the stamper distortion.
When photochromic reactions did not take place, absorptivity was 80%, and after all photochromic reactions taking place, absorptivity is about 40%.In the regular hour, the threshold value of photochromic reactions is about 2.5mW, when the intensity of imprinting laser is 0mW, 4mW, 9mW and 15mW, can make absorptivity be respectively 80%, 67%, 53% and 40%, represent 4 kinds of states of 4 rank storage respectively: " 00 ", " 01 ", " 10 ", " 11 ", the i.e. data of two byte.
Automatic focusing system and automatic tracking system are all used the laser of 405nm, and its work light intensity is 1.5mW.In number imprinting process, the laser of actual use 1.5mW when engraving data requires the intensity of laser to be 0mW is to guarantee that automatic focusing and automatic tracking system still can operate as normal.Because still less than threshold value 2.5mW, engraving data is still correct 1.5mW.
Claims (2)
1, the mother CD burning of multi-wavelength multistep read-only optical disk and manufacture method, it is characterized in that: it is a kind of selection absorption characteristic of utilizing the recording materials correspondence, carry out the multidiameter delay imprinting with multi-wavelength imprinting laser, and the method for multistage storage on each layer, it comprises following steps successively:
(1) photographic layer that is mixed by the multiple one to one photochromic material of multi-wavelength's laser is spun on the glass substrate, this photographic layer thickness is less than the depth of focus of used all laser;
(2) multi-wavelength's imprinting laser focuses on the same photographic layer by apochromatic objective, carries out the multidiameter delay imprinting.The focusing signal is that the reflected light from one road laser wherein detects and obtains;
(3) in the imprinting process, change the absorptivity of exposure area photochromic material to specific wavelength laser, and by the height sublevel of absorptivity with record data;
(4) after imprinting is finished photographic layer is fixed, made photosensitive material, improve photographic layer stability no longer to the imprinting laser-sensitive;
(5) fixedly finish after on photographic layer the curing medium layer of spin coating layer of transparent again; all are peeled off from glass substrate with curing medium layer and photographic layer to adopt separating technology then; get rid of on photographic layer then again and coat transparent protective seam, the mask that is made of curing medium layer, photographic layer and protective seam is the stamper that can be used for multi-wavelength multi-exponent read-only mother disc duplication process.
2, according to the imprinting and the manufacture method of claims 1 described multi-wavelength multistep read-only optical disk stamper, it is characterized in that: described change exposure area photochromic material is to realize by the exposure intensity that changes in the imprinting process to the absorptivity of specific wavelength laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031026826A CN1207710C (en) | 2003-02-14 | 2003-02-14 | Mother CD burning and making process for multiwavelength multistage read-only CD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031026826A CN1207710C (en) | 2003-02-14 | 2003-02-14 | Mother CD burning and making process for multiwavelength multistage read-only CD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1441412A true CN1441412A (en) | 2003-09-10 |
| CN1207710C CN1207710C (en) | 2005-06-22 |
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|---|---|---|---|
| CNB031026826A Expired - Fee Related CN1207710C (en) | 2003-02-14 | 2003-02-14 | Mother CD burning and making process for multiwavelength multistage read-only CD |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452209C (en) * | 2005-03-08 | 2009-01-14 | 清华大学 | Method for producing multi-exponent read-only mother disc |
| CN100452203C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage read-only master |
| CN100452204C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage CDROM |
-
2003
- 2003-02-14 CN CNB031026826A patent/CN1207710C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452209C (en) * | 2005-03-08 | 2009-01-14 | 清华大学 | Method for producing multi-exponent read-only mother disc |
| CN100452203C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage read-only master |
| CN100452204C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage CDROM |
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| Publication number | Publication date |
|---|---|
| CN1207710C (en) | 2005-06-22 |
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