TW200426813A - A novel write-once multi-layer optical disk using transparent recordable material with optical switching layer - Google Patents

Abstract

In this invention, a structure of multiple transparent films with optical switching layer as recordable media is proposed to increase the number of recording layers in a multi-layer disk. In the disk, the optical switching layer is adopted to reduce laser energy decay and increase recording sensitivity while reading and recording, respectively, so that a sub-micron to nano order well-defined deformation area (mark) can be written precisely on the surface of transparent film by a focused laser beam. Therefore, high transparent film with optical structure as recording media can achieve tens or more recording layers on one disk surface. Consequently, the invention "A Novel Write-Once Multi-layer Optical Disk using Transparent Recordable Material with Optical Switching Layer" can provide a much higher recording capacity with high read out ability and recording sensitivity in volumetric disk using conventional optical pick up units.

Description

200426813 V. Description of the invention (1) I. [Technical field to which the invention belongs] Since the introduction of laboratory products in the late 1950s, compact disc-digital audio (CD-DA) has gradually evolved until the late 1970s. Be commercialized. Later, in 1980, the Dutch Phil ips company and the Japanese company SONY successfully completed the commercialization of the digital music disc system, and jointly produced a standard for their 4 standards. After a red paper (red B 00k), In the past few years, the technology of optical disc storage system has made considerable progress, and the market has also been booming. Especially the development of compact disc-read (CD-ROM) is even more impressive. With the advent of the information and multimedia generation in recent years, including computers, communications, and consumer electronics, the demand for storage density and capacity of storage media = the development of storage optical disc systems is even more attractive. Note: Erqiao's excellent mass production technology, dye homemade: For: Li. Due to the scale of Taiwan's economy, Taiwan ’s b = Cheng “capable supply”, the production cost of bow micro-sellers has spread greatly; f Μ is reduced, and it has become the world ’s production center for CD-R. Putiandu ’s CD-R discs Films after 1997 # #%

There are several reasons for this: The existing market for superseding magnetic discs. 1. In the past, CD-R discs were only used by CD-R writers to reduce their prices and to store computer information media. However, CD-R was gradually discovered with _ Used to store the economics of the consumer sentence / 9 music media after the price crash, plus

Explanation of the poor (2) The storage life of the CD-R disc itself has largely replaced analog signal storage, digital signal storage media (CD-R) 2. The advent of the Internet century, such as tapes and audio tapes. It is more convenient to gather useful information on the Internet, and consumers burn it to CD-R discs with a burner. It can also be downloaded to the hard disk, and it can also be transparent. 3. Since CD-R discs can be written only once, it has officially become a legal storage medium. Courts, libraries, and finance in China, China 4. Because the computer virus is raging = state films are backed up, stored and broadcasted to prevent; materials = materials are used extensively, but to store higher-quality video materials (such as two-hour DehmUon TV movies) ; Or more data, the first generation of recordable f-discs must have a higher capacity for the same disc size. -Generally, under the consideration of physical limits, the recording capacity of a disc depends on: (1) Numerical Aperture (NA) of the objective lens in the optical pickup head (OPU, 0ptical Pick UP head Unit) and (2) laser light Wavelength (a, wavelength). The optical § selling head can form FWHM (full width of half max i mum). The direct control of the light spot is limited by the diffraction limit (diff rac ti 〇 n 1 imit) "0.6 and / NA", and the disc capacity is also limited by this parameter. . CD-R, using a laser light source with λ (wavelength) = 780 nm, an optical pickup of 0.45NA 200426813 T. Description of the invention (3) 6 50 MB (mega byte) data can be recorded. In the DVD era, the use of a short-wavelength laser light source with a wavelength of 650 nm and a numerical aperture of 0.6 is an optical pickup head 'that makes it possible to make a 5 GB disc capacity. Although increasing να can gain the benefit of “generating a smaller light spot”, it also leads to two new problems: “objective lens design is more difficult” and “disc tilt tolerance is better and more rigorous”. Therefore, by using higher NA and shorter wavelength light to increase the recording capacity of the optical disc, in order to make the objective lens and the light source 2 more, the mechanism of the optical disc drive and its servo circuit must also increase its accuracy. ^ In addition to one of the methods described above, if you want to use black, black and white jS shi Liudan 3 ± recordable multi-recording layer light 磾 J 1 Ί ·? The requirements of speed and speed, is an effective 化 ^ 1 disk) data layer When the DVD specifications were formulated,-the species had dual: layers ,,,. The structure of the first disc is quantified by the DVD-9 specification light monument κGu Yi π. The early return layer has a reflective layer of 8.5 GB. In this way, there is half of the | ΓΓ that can reflect 18 ~ 30% of laser light. Laser light penetrating the first: Enough to read the information of the-layer, while giving up. The f of the two data layers further reads the data space (spacer) on the second layer, and the second: the interval layer number of 40 ~ 70 °. Compared with the total reflection layer] Also: there are more stringent requirements to distinguish the different signals from the two layers. ♦ The process and material characteristics when used as a semi-reflective layer. With 18 ~ 30% reflectivity, high light transmittance, etc. This creation "New Multi-layer Recordable Disc" proposes a multi-recording layer disc

Page 7 200426813 V. Description of the invention (4): Constructing this disc combines the advantages of a write-once recording medium and not only can greatly improve the write-once-recording j-layer disc, but also has the advantage of easier production. There are two important features in this optical disc: Second, it has the characteristics of using a "light control layer" * to control the light energy, and its distribution can make full use of the laser light energy. The recordable media can reduce the recording layer itself d and ^, in addition to the degree, to achieve a multi-layer recordable number of recordable layers of laser light cross talk (inter-layer crosstalk). The creation of "low-layer interlayer recording discs" will be compatible with the current optical reading and writing in the optical disc drive (i.e., it is not necessary to significantly change the laser light wavelength and the numerical aperture of the objective lens. The recordable layer, up to two to every piece), has the advantage of increasing the amplitude. In addition, the present invention can also be combined with land-groove recording, short-wavelength laser, and high-s recording high-density recording technologies to increase the recordable capacity. Xiang Shuoshu, etc. Prior Technology

Optical recording media (such as CD-R) uses a high-powered dye layer to record irreversible chemical changes. The range of exposure can be defined as two levels of 0 and 丨, using digital coding Digital coding technology can store meaningful signals on this surface. The optical disc drive can read these combined signals of 0 and 丨, and after analyzing them with a digital decoder, the stored data can be dreamed of. Since the optical disc specifications were proposed so far, the scope of commercialized products is still

200426813 V. Description of the invention (5) Planar recording method. In order to increase the data storage capacity, the number of sound recordings has been changed from a two-dimensional planar recording method to a three-dimensional recording: ϋΓ is a multi-recording layer disc. The ideal multi-recording layer light is composed of dozens or more data layers to make the disc recording volume group: two: the laser light is incident from one side of the disc, by reading the lens dog Γΐ ΐ : Read data at different levels. The energy of laser light ::: points π and partial reflection, as shown in Figure-. However, if the number is too late, it will make ί 3 Γ 5 that is far from the substrate of the optical disc (substrate) the energy of the laser light is greatly attenuated by the focusing layer and it becomes difficult to say. According to the specifications of 8 WR — VerSa disk), the multi-layer recording method includes a single-sided double-layer disc (DVD-9 format) and a double: dual = disc (_-18 format) with a capacity of 8 GB. But because of this multi-recording double! In the monument :: one recording layer will attenuate the laser light energy and limit the total recording purity of two layers =, so it cannot be further improved in order to overcome this light. Recording discs: the disadvantages of 10%, this book "the lack of control sound to '/ i caused by the new multi-recording layer disc design. The structure includes transparent recording materials and" light "buckets"): phase change ('Material is relative to current recording materials such as ^ (magneto-〇ptical) ^ rr ^' Chang! -Raelal) Section 5 has a very high transmittance, using page 9 200426813 V. Description of the invention (6) This The transparent recording material can increase the light energy in this way. Although the high penetration makes the recording light in the disc unable to efficiently record the material, the excellent transmittance of the rain penetration rate and the ease of writing require a "light control (target layer) i% so that the point of use can be reached. In order to fully facilitate the The number of multi-rate transparent layers is increased at this material point, and the target layer that it enters is used to extract or write the number of lasers written with high transmittance. A large amount of light energy will keep the laser transparent to achieve higher structural purposes. Layer absorption rate, two advantages in this invention are feasible. The change of the sub-polymer, that is, the use of lasers to control the optical properties of the material. Focusing on some other non-concentrated pair of laser light to significantly increase the use of species can be used, the use of laser can achieve When the polymer enters the data layer, the focal layer will have the attenuation dimension of the focal layer plus the data layer for recording. The recorded light will heat the polymer at the last absorption rate. The light intensity of the polymer will be reduced. The material is micron to extremely low, and the formation of different layers with the noted heat has permeability. The material of the laser recording material is surface layer plus nanometer and so on. And changing the South reflection so that the use of materials to explain the thermoplastic heat caused advanced signal materials can not use this "light control to achieve the rate (or absorption can make the efficiency of the optical high score of the present invention low and fluctuating. But transparent Directly reach the light control layer layer "when the laser light yield) is not the target layer, so it can be 200426813 V. Description of the invention (7)

SUMMARY OF THE INVENTION It is desired to increase the amount of light that is compatible with several important factors (the target and the low absorption of the low reflectivity and the low reflectance layer are higher than the current recording layer). Thunder-type multi-recording reads and writes the target for each purpose, and the non-purpose and non-purpose light control records the number of records. When the optical layer 3 has a recording layer structure and a recording layer, the target layer uses the "optical layer two kinds of layers, which can have the purpose of making the layer and the signal, but due to the recording characteristics, the optical disk cannot be matured. When Reading the recording layer's interlayer characteristics of the recording layer will make the light source "can be equipped with a recording layer. At this time, the control layer state can be 100% extremely high. For example, the number of recording layers can be changed in an unlimited number. To achieve the easy machine reading and writing system, it is necessary to consider that the following written ® light passing through too many non-purposes will cause too many radiated m to be attenuated by the machine, so the recording layer needs to have high transmittance. However, according to the conservation of energy theory, a high-penetration design will result in a low absorption rate. Recording the utilization of laser light energy is too low, which is required. In order to solve the above-mentioned problems, this creation "new good this shortcoming. This new multi-recording layer disc is designed to have a composite function: read and write non-high optical properties in the optical head, and high absorption in the optical recording layer. In order to achieve this "* structure, the recording layer can be accurately controlled at the target layer. In an ideal situation, the optical transmission properties of the optical disk can be converted into optical absorption through the light transmittance on the recording layer. In this way, the optical disc can have more recording layers than 100% penetration. , And the light control can not reach 100% of the impact, so increase the number of recording layers. Comprehensive above

200426813 V. Description of the invention (8) As mentioned above, the recording material of the optical recording medium with high penetration and multiple recording layers has a light transmittance of three-dimensionality, which can be achieved by using a considerable number of optical discs in development. § Recordables of recorded media discs (such as CD-R / RW have low penetration but not enough south. If you want to record more discs, an important item with high penetration is combined with high penetration and high current. Recording capacity and the number of layers of South conversion data, DVD R / rw materials, due to the use of such records, will encounter recordable profile items. The key to the rate recording material and low interlayer efficiency of the present invention, M0, is the kind of recording material To the above materials will be proposed in the light control and light control crosstalk. In the MD, etc.) The material is a new layer of the new layer to record the difficulty of the disc. 〇Because of the multi-recording structure of the layer disc, the optical disc can be used today, because the decay of laser light control or writing light is concentrated, so it has been tended to be a layer structure that is designed or absorbed by the recording material. When entering the layer, it is necessary to subtract two mesh materials to make it clear that what is more mature is to change the material rate. There can be two. It is considered that the optical polymer polymerization process conditions of the optical disk structure of the transparent recording layer meet the requirements of making the structure of the light control layer, and the transparent transmission rate can be reduced to reduce the feasibility of recording under the layers. . Recordable materials are physical materials and the conditions required for such materials. In addition, it can make the material correspond differently. The recording material is non-reading crosstalk and the laser is reduced. It is explained that the optical media is high. The recording medium is made of thermoplastic plastics, which is a kind of transparent polymer. Change in volume when heated. Thermoplastic polymer gathers people 2 ^ characteristics will be available

Page 12 200426813 V. Description of the invention (9), a certain number of types have high transparency ^ molecular polymer materials' its important physical characteristics = high optical grade materials have the characteristics of irreversible thermal volume change. Because this material is deformed by heat, it can be divided into two forms, the layer: the recording medium. In order to reduce the shape of the acceptor film after heating by a heat source, (B) (0 when the heat source leaves, the volume does not continue to cause a volume expansion, as shown: ⑴ is-polymer polymerization;-a form As shown in Figure 31, the shape of the heat source becomes different after heating. '(B) means (c) The volume does not continue to change when the heat source leaves. H volume end is small' is the recording medium. The control of temperature change is phase ♦ Refocusing on this property for change control can precisely control the polymer; the amount of shape: the temperature of Li = Ϊ 3 can achieve this purpose. The high penetration rate of this material, two excellent in the thunder layer media, point , But very low optical absorption: at the point of multi-recording low power (less than 5GmW), the laser light point is at the point of focus = in order to achieve the advantages of both aspects ::; =: made of high polymer materials; It is enough to control the optical chirp and accurately distribute the laser light energy. This figure is shown in Figure 4. In the optical disc recording system, the t-ray light source is:-a light spot with a high light energy density due to the material layer; The formation of thermal energy causes the temperature of the data layer to rise. Focusing the light spot has the characteristics of high optical energy density, to control the inversion of the data layer. 200426813 V. Description of the invention (10) Body X: Henry ^ 8 and yield) to achieve the purpose of reading (writing). In addition to the recording medium, the optical high-second material in this creation is also the data layer = spacer. "Yao Qiao IV [Implementation Mode] A deformed material is proposed here. The layer has a high absorption temperature change, such as the temperature distribution, so the polymer is condensed, as shown in Figure 6. The material still maintains light energy. In order to achieve this effect for laser light transmission, an example shows that when the laser light that is focused is focused on the yield, the laser can be used. The temperature of the polymer material is shown in Figure 5. At this time, the light energy returned due to the high radiation is changed compared to the composite material due to heating. When the laser light stops holding the shape as shown in Figure 6, due to more precise control of this high-resolution is a composite pulse (mul 'laser light output waveform polymer polymer material such as heat-controlled light control layer, at this time light control light energy The degree of conversion into thermal energy has not been added to the instant, and its molecular polymer material has not yet been shaped. After a very short (~ ns) time, the shape is reflected and reflected back to a lower light for heating. This polymer can also be heated. Deformation of the sub-polymer material with lower reflection back, and the writing method of controlling ti-pulse) can be shown in Fig. 7. = ^ The use of a transparent polymer as the = recording layer in the optical control layer of the disc, the recording material 2 is explained. The description is as follows: 'The field-light effect relationship for the light control layer has two relations with the two-radiation parameters (Π ^ / Hotan light-emitting layer: non-target layer: when the laser light is focused on a certain light # Nine control layers will form _ 200426813 > Explanation of the five inventions (11) Diffraction limit, and the focusing ratio of the diffraction limit well M focusing layer forms a diffused light spot. The surface of the diffused light point is far more than the diffraction limit; a lot more, besides this, diffused light The light intensity of the point also controls the light point of the layer to be much smaller. Therefore, diffusing the light point does not change the light (especially the characteristics, as shown in Figure 8. Nine degrees ^ " light control when the light is low / Λ laser light focus In the light control layer, a high light intensity = rate makes the focus tracking signal stronger and allows optics; the head is higher and easier to lock, as shown in Figure 9. 九 " 贝 写 硕 更 容容 (3) Write • 者 古 疮 姑 _ When Tian W power laser light is focused on the light control layer, it is highly concentrated: the optical characteristics of the t control layer are changed. &Amp; The time energy absorption rate 捭 Ί, 'is also a written mark, such as; Kaidong is a write-subtype recording medium. Α is not a bounceable response, so '::: in the data layer The effective function of the optical switch-1 1 and / reflection and other characteristics, this material must have the following characteristics: 疋 non-linear 2 ϋ ϋ! N and k of the material need to change with the light intensity Itch 1! Sigh. _ Λ. _ The drought degree is 1 nm ~ 1 mm, when the optical opening sa can reduce more laser light energy. Stomach material is too thick or semiconductor glass-ceramic. Etc. In addition, liquid crystal materials, optical polymer materials need to have the characteristics of 'after the above laser ^, large or small 1 W field' after its heating surface changes Gao Wen J,

According to the above 7 characteristics, it can be used as an optical switching material such as, metal, Zn-Cu, Ag_Cu, π_ = thin metal oxygen 200426813

V. Description of the invention (12) lnm ~ 1m, each layer of optical polymer More detailed description of the "light control layer" can be made of a material with a thickness of 1m ~ lmm. Application of CD-ROM. Examination patent: "The optical switch is a single write-once recording layer above the capacity

The thickness of the material is about 20 ~ 100 m, which is beneficial to the statement of δ recording method. Transparent recording to make a light control layer thereon. The physical or chemical deposition method of the star can be too thin and the mechanical strength is not enough. The transparent recording material of the light layer is formed by repeatedly stacking and bonding with light control. It is used in the optical disc drive rotating at the south speed, which increases the Number of data layers ^ layers of transparent recording materials can not only use UV-reisn, but also increase the mechanical strength of optical discs. The transparent recording G $ technology with a light control layer can glue more than one layer. This step can glue dozens or even hundreds of scraps together. Repeating is a "new multi-layer recordable light repeating structure." As shown in the figure, in the current technology, part two of the side view structure of the light two can be written or read at the zoom point position, and the laser read head in the machine can modify the data. Out of this optical disc The creation of different recording layers "New multi-layer recordable light ^ ^

The control layer precisely controls the distribution of the signal on the surface of transparent bismuth ^ to change the same degree of the surface to form a recording signal & "-^ ^ τ view principle to produce a high data capacity multi-a recording layer disc, the purpose is to improve the front ^ + ^ 幵 The data capacity of the pre-disc of the early film, in order to facilitate the second screen, or 写 write-time digital discs with Λ to the recording capacity, use. The disclosure of the above-mentioned slavery examples is used to illustrate the present invention, and is not

200426813 V. Description of the invention (13) is used to limit the present invention, so any change in the value or equivalent component replacement should still belong to the scope of the present invention. From the above detailed description, one skilled in the art can understand that the present invention can indeed achieve the aforesaid objects, and that it has indeed complied with the provisions of the Patent Law, and filed a patent application. * Republic of China patent pending

Page 17 200426813

Page 18 200426813 Schematic illustration of the fifth diagram of the initial temperature distribution of the recording structure 50 Concentrated reflected light 51 Laser light with diffraction limit 52 Light control layer 53 Temperature distribution on the light control layer 54 Optical polymer materials Figure 6 of the temperature distribution I The final temperature distribution of the recording structure 60 Very scattered reflected light 61 Light control layer 62 Molecular polymer material 63 Temperature distribution on the light control layer 64: Temperature distribution on the optical polymer material Composite pulse writing method 70: Light control layer 7 1: Optical polymer material 72: Laser light output energy Figure 8 Data layer and extremely low light intensity effect (laser light is not focused on this data layer) 8 0: Light control The layer does not change 8 1 · The ninth picture of the optical polymer material and the low light intensity effect (laser light is reading this data layer)

Page 19 200426813 Brief description of the diagram 90: Low laser light power for reading signals 91: "Light control layer" that does not interact with laser light 92: "Light control layer" that interact with laser light Absorptance / Reflectivity 93: The tenth picture of the optical polymer material and the high light intensity effect (laser light is written into this data layer) 1 0 0: High laser light power for writing signals 1 0 1: Not related to "Light control layer" that acts with laser light 102: "Light control layer" that interacts with laser light, has high absorption / reflection I 0 3: Writing mark formed by deformation due to heating of the area 104: Optically high Molecular Polymer Materials Figure 11: New Multi-Recording Layer Write-once High-Capacity Recording Disc II 0: Glue Material III: “Light Control Layer” 11 2: Polymer Polymer Material

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Claims (1)

200426813 VI. Scope of patent application Patent application scope 1. "New materials increase by the number 2. Rushen laser layer" Absorption in school 3 · Rushen has a laser light characteristic. 4 · If non-linear and different lightning 5 · If multi-layer and "light plus, please apply for patented absorption of different lightning and reflection, please patent a kind of recordable disc control switch for light intensity," multiplication is the first on the same base as the first In the optical range described in item 1 or reflected, the intensity of light emission, penetration, and other optical ranges of the first item are different. The structure includes the "light control film structure or It has different characteristics. The "light controlled absorption or anti-optical absorption, which contains more capacity of the disc. The layer" is a general term. Temporal layering "special reflective, patented materials, whose light intensity is clearer than patented films or one layer is 6 The various patented materials of the film itself are: the optical parameters of the "light control layer" described in the third item of Yinwei (optical constants have different values when irradiated. The thin film structure of the "light control layer" described in the second item The general term for this structure is a linear material layer. The method described in the first item, "The light control of laser light with the same wavelength varies with the transmittance or the intensity of the X-ray light. The method described in the fourth item, A recordable layer that can be transparently recorded in the shape of (Ag), copper (Cu), or (Zn) layers. One can change this "light control has different optical elements, and their material properties are at different penetrations, such as optical element materials). And k in the element is a single layer or layer "is characterized by the reflectivity of the above non-transition metal Page 21 200426813 ♦ 6. The scope of application for patents and other alloys and their oxide series, titanium cyanine dyes (Phthalocyanine) and other materials are materials such as 'II-VI semiconductor materials' liquid crystal materials, semiconductor glass-ceramics, and the thickness of the "light control layer" is 1 nm to 1 min. The method described in the first item of the Fangli range is to make a "light control layer". People / = are: physical deposition method or chemical deposition method, physical deposition method including two u, sputtering method and rotary coating, etc. ; And the chemical method includes electroplating and chemical vapor deposition and the like. '92: The method described in the item Γ in 2 ranges, the recording medium is characterized by PC U τ material thickness 1 " mmmm irrigation A,:, PS: C, TPX, PEDC (CR_39) or other related material. 1. According to the method described in the ninth item of the scope of the patent application, + the material that will be changed by a large volume of heat, here ^ the undulations of the molecular polymer surface. ^ 成 11. According to the method described in the ninth item of the scope of the patent application, the ancient compound material is deformed by heat and the size is 4 ^ The knife is two, that is, the surface layer of the polymer is written on the control. According to the tenth item r, the surface height change range caused by temperature is +1 wide: two molecular materials 1 3. The method described in the first item of the scope of patent application-:. A multi-recording layer disc is adopted as the recording method. . "Li" Recorded Disc II /: Shen: As described in the method described in item 13 of the scope of the patent, the number of M i Λ Shen Λ record Λ data layer is greater than one layer of recording medium. The method described in the thirteenth patent application, multi-recording layer disc 200426813 6. The single recording layer structure in the scope of the patent application is a "light control layer" made on a thin optical polymer material. The characteristics of the thin optical polymer material are shown in item 9 of the patent application scope. 16 · According to the method described in item 13 of the scope of patent application, stacking and bonding more than one layer of recording layer structure is the "new multi-layer recordable optical disc". Page 23