WO2005078716A1 - 情報記録媒体 - Google Patents
情報記録媒体 Download PDFInfo
- Publication number
- WO2005078716A1 WO2005078716A1 PCT/JP2005/002213 JP2005002213W WO2005078716A1 WO 2005078716 A1 WO2005078716 A1 WO 2005078716A1 JP 2005002213 W JP2005002213 W JP 2005002213W WO 2005078716 A1 WO2005078716 A1 WO 2005078716A1
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- WIPO (PCT)
- Prior art keywords
- recording
- recording layer
- layer
- film
- reflective film
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/266—Sputtering or spin-coating layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
Definitions
- the present invention relates to a technical field of an information recording medium such as a DVD.
- information recording media such as optical discs such as CD-ROMs (Compact Disc-Read Only Memory), CD-Rs (Compact Disc-Recordable), and DVD-ROMs are disclosed in Patent Document 1 and the like.
- a multi-layer or double-layer or multiple-layer optical disc in which a plurality of recording layers are laminated on the same substrate has been developed. More specifically, the two-layer type optical disk is firstly located on the most front side (that is, the side close to the optical pickup) when viewed from the laser light irradiation side when recording by the information recording device.
- first recording layer referred to as an “L0 layer” as appropriate in the present application
- second recording layer referred to as “L1 layer” in the present application
- L1 layer located on the back side of the transflective film with an intermediate layer such as an adhesive layer interposed therebetween
- a reflective film located on the side.
- an information recording apparatus such as a CD recorder for recording such a two-layer type optical disc
- a laser beam for recording is applied to the L0 layer, so that the L0 layer is formed.
- information is recorded in an irreversible change recording method such as heating or in a rewritable method, and the laser beam is focused on the L1 layer, so that the information is recorded on the L1 layer. Irreversible change recording due to heating, etc. Recording is performed using an irreversible change recording method such as heating or a rewritable method.
- Patent Document 1 JP 2001-23237 A
- the present invention has been made in consideration of, for example, the above-described conventional problems. For example, by providing each recording layer with the same recording characteristics, a multi-layer type capable of appropriately recording and reproducing information can be provided.
- An object of the present invention is to provide an information recording medium.
- an information recording medium of the present invention has a first recording layer, and a semi-transmissive reflection layer for reflecting at least a part of a recording laser beam applied to the first recording layer.
- a second recording layer irradiated with the recording laser light via the film, the first recording layer and the semi-transmissive reflection film, and reflecting the recording laser light irradiated on the second recording layer.
- the first recording layer has a substantially same heat conduction to the semi-transmissive reflection film when irradiated with light.
- FIG. 1 shows the basic structure of an optical disc according to a first embodiment of the information recording medium of the present invention
- the upper part is a schematic plan view of the optical disc having a plurality of recording areas, and is associated with this.
- the lower part is a schematic conceptual diagram of the recording area structure in the radial direction.
- ⁇ 2 A partially enlarged perspective view of a recording surface of the optical disc according to the first embodiment of the present invention.
- ⁇ 3 A cross-sectional view of the optical disc according to the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view of an optical disc according to a comparative example of the optical disc according to the first embodiment of the present invention.
- FIG. 5 is a cross-sectional view conceptually showing the method of manufacturing the optical disc according to the first embodiment of the present invention.
- FIG. 6 is a sectional view of an optical disc according to a second embodiment of the present invention.
- FIG. 7 is a cross-sectional view conceptually showing a method of manufacturing an optical disc according to the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view of an optical disc according to a third embodiment of the present invention.
- FIG. 9 is a sectional view conceptually showing a method of manufacturing an optical disc according to the third embodiment of the present invention.
- FIG. 10 is a block diagram of an information recording / reproducing device 300 according to an embodiment of the present invention.
- An embodiment of the information recording medium of the present invention includes a first recording layer, a semi-transmissive reflective film for reflecting at least a part of the recording laser light applied to the first recording layer, A second recording layer irradiated with the recording laser light via the first recording layer and the semi-transmissive reflection film, and a reflection film for reflecting the recording laser light irradiated on the second recording layer Heat conduction from the second recording layer to the reflection film when the second recording layer is irradiated with the recording laser light, and the recording laser light is irradiated to the first recording layer. And the heat conduction from the first recording layer to the semi-transmissive reflective film is substantially the same.
- the first and second recording layers are each composed of a recording layer of an irreversible change recording type by, for example, heating a dye film or the like. Alternatively, it may be composed of a phase change type recording layer. Therefore, when information is recorded on the information recording medium on the first recording layer, a recording laser beam is focused on the first recording layer. Thereby, for example, a recording pit or a recording mark is recorded on the first recording layer. Further, when information is recorded on the second recording layer of the information recording medium, a recording laser beam is focused on the second recording layer via, for example, the first recording layer. .
- the first recording layer and the second recording layer are provided, for example, between the first substrate and the second substrate. That is, the first substrate, the first recording layer, the transflective film, the second recording layer, the reflective film, and the second substrate may be stacked in this order when viewed from the side irradiated with the laser light. .
- heat conduction from the region of the first recording layer irradiated with the laser beam that is, the region where the recording pits and recording marks are formed
- the difference between the heat conduction characteristic) and the heat conduction to the reflection film in the second recording layer irradiated with the laser beam is small (or ideally, equivalent or substantially the same).
- a configuration may be adopted in which a reflective film is formed so that these heat conductions are substantially the same.
- the above-mentioned heat conduction is made substantially the same (for example, to the extent that the heat conduction is the same or similar).
- Reflection film is “uniformly formed.
- a film forming process such as a CVD process in the process of forming a reflective film is performed by a second recording layer (or, for example, a second substrate) in the same manner as in a conventional manufacturing method such as the above-described conventional technology.
- a reflective film is formed by uniformly forming a film on the entire surface. That is, when the entire surface of the second recording layer is flat and uniform without any irregularities, the reflection layer having a uniform thickness is formed on the second recording layer by being formed uniformly. That is, if the surface of the second recording layer has irregularities, a reflective film whose film thickness changes slightly according to the irregularities is formed on the second recording layer. As described above, the film is uniformly formed on the surface of the second recording layer. As a result, the reflective film is uniformly formed over the entire area of the second recording layer, as in the case of the above-described conventional manufacturing method such as the related art. It will be formed in.
- the reflective film may be formed so that the difference in heat conduction is reduced as compared with the case where the film is uniformly formed. . That is, as compared with the case of “uniformly formed”, the heat conduction from the first recording layer to the transflective film and the heat conduction from the second recording layer to the reflective film approach each other (or substantially. The same processing is performed.
- the heat conduction may be made substantially the same by using a low thermal conductive film, or a material such as a first recording layer or a second recording layer, a semi-transmissive reflective film or a reflective film may be used.
- the heat conduction can be made approximately the same by selecting as appropriate.
- the heat conduction from the first recording layer to the transflective film and the heat conduction from the second recording layer to the reflecting film are relatively different, if one of the recording layers has In the recording layer, heat diffusion progresses relatively quickly (ie, heat conduction is relatively easy), and in the other recording layer, heat diffusion progresses relatively slowly (ie, heat conduction is difficult). Therefore, the state of the recording pit or recording mark recorded by the laser beam changes. This has a technical problem that it is not preferable from the viewpoint of performing a stable recording operation, and also leads to an increase in recording errors.
- the heat conduction from the first recording layer to the transflective film is substantially the same as the heat conduction from the second recording layer to the reflection film.
- the recording characteristics of the 1st recording layer and the 2nd recording layer are different be able to.
- the heat conduction from the first recording layer to the transflective film and the heat conduction from the second recording layer to the reflective film may be equal.
- the difference be small enough that the recording characteristics in the first recording layer and the recording characteristics in the second recording layer are the same or substantially equal.
- the same or substantially the same recording characteristics can be obtained regardless of whether the recording layer is the first recording layer or the second recording layer, and a stable and appropriate recording operation can be realized.
- the same recording characteristics can be realized for each recording layer, and as a result, an appropriate recording operation can be realized for each recording layer. It is possible to do.
- the reflective film is formed in contact with a partial area of the second recording layer.
- heat conduction from the first recording layer to the semi-transmissive reflective film and the second recording layer to the reflective film And heat conduction to the same. That is, since heat is conducted (or diffused) by irradiating the reflective film with the laser light, it is relatively easy to appropriately adjust the size of a part of the region where the reflective film is formed.
- the recording layer can be made substantially the same. This is because, for example, heat conduction is relatively large in the portion where the reflective film containing metal is formed (that is, heat conduction is easy), while heat conduction in the portion where the reflective film is not formed is relatively large. It utilizes the fact that it is small (that is, it is difficult to conduct heat).
- the “reflection film” according to the present invention refers to a metal film having a thickness equal to or more than a predetermined value, such as an aluminum alloy, which also has a strong force.
- % Means a film having a high light reflectance close to%.
- a reflective film various kinds of existing or known reflective films can be adopted.
- the structure of the first recording layer can be the same as the structure used in the conventional information recording medium. Therefore, the technical development of the first recording layer has been cumulatively advanced. There is also an advantage that excellent excellent recording characteristics can be obtained.
- a portion in contact with a partial area of the second recording layer is formed with a first thickness.
- a portion in contact with the region excluding the partial region is formed with a second film thickness that is smaller than the first film thickness.
- the heat conduction becomes smaller as the thickness of the reflection film becomes smaller, the heat conduction from the first recording layer to the semi-transmissive reflection film and the heat conduction from the second recording layer to the reflection film become smaller. It becomes possible to make heat conduction substantially the same. Further, when manufacturing an information recording medium in which a reflective film is formed in a part of the above-mentioned area, the reflective film may adhere to a part other than the part depending on manufacturing conditions and the like. In addition, if the attached reflection film is thinner than the reflection film to be originally formed, it is possible to enjoy various benefits of the information recording medium according to the present embodiment. Therefore, there is an advantage that the yield of the information recording medium according to the present embodiment is also improved.
- the first region and the second region which will be described later, are not necessarily the same in size, but are not necessarily the same. It is preferable that the heat conduction in each recording layer be substantially the same in consideration of the heat conduction in the thick reflective film.
- the first surface of the bonding surface between the first recording layer and the transflective film to which the laser light is irradiated is used.
- the reflective film is in contact with the partial area such that the area and the second area of the bonding surface between the second recording layer and the reflective film to which the laser light is irradiated are substantially the same. Formed
- the heat conduction from the first recording layer to the transflective film and the heat conduction from the second recording layer to the reflective film can be relatively easily made substantially the same. . That is, since the heat due to the laser light is conducted at the bonding surfaces between the respective recording layers and the reflective film or the semi-transmissive reflective film, the size of the region irradiated with the laser light (ie, the first If the size of the region and the size of the second region are the same, their heat conduction can be close to each other. That is, the difference in heat conduction can be reduced.
- “identical” literally indicates the same size, and a size that is substantially the same, more specifically, the recording layer (the first recording layer or the second recording layer) in both areas. From the surface to the reflective layer (semi-transmissive reflective film or reflective layer). It is a purpose.
- At least a partial area between the reflective film and the second recording layer has a lower thermal conductivity than the reflective film.
- a low thermal conductive film having the following is formed.
- the same state as in the above-described mode in which the reflective film is not formed, in which the heat generated by the laser beam is not easily conducted, can be created. Therefore, if a low thermal conductive film is formed in a portion where the thermal conductivity is desired to be reduced, the thermal conduction from the first recording layer to the semi-transmissive reflective film and the thermal conduction from the second recording layer to the reflective film can be relatively easily reduced. It is possible to make them the same.
- a member having a lower thermal conductivity than the reflective film can be used as a low thermal conductive film.
- the low thermal conductive film may be formed in a partial area between the reflective film and the second recording layer, or may be formed on the entire surface. Further, in the case where it is formed in a partial area between the reflective film and the second recording layer, the size (or range) of the low thermal conductive film to be formed depends on the thermal conductivity of the low thermal conductive film. It is preferable to adjust it appropriately. In any case, the low thermal conductive film must be formed so that the difference between the thermal conduction from the first recording layer to the transflective film and the thermal conduction from the second recording layer to the reflective film is small. Is preferred.
- the heat generated by the irradiation of the laser beam from the second recording layer to the reflective film and the force of the first recording layer are also reduced.
- the heat conduction transmitted to the transflective film is substantially the same. Therefore, the same recording characteristics can be realized for each recording layer, and as a result, an appropriate recording operation can be realized for each recording layer.
- FIG. 1 shows a basic structure of an optical disc according to a first embodiment of the information recording medium of the present invention, wherein an upper part is a schematic plan view of an optical disc having a plurality of recording areas, and a lower part corresponding thereto.
- the portion is a schematic conceptual diagram of the recording area structure in the radial direction.
- the optical disc 100 is, for example, a lead-in on a recording surface on a disc body having a diameter of about 12 cm, similar to a DVD, with a center hole 1 as a center and an inner peripheral force toward an outer peripheral side.
- An area 101, a data zone 102, and a lead-out area 103 are provided.
- tracks 10 such as groove tracks and land tracks are alternately provided in a snail or concentric manner centering on the center hole 1.
- the sector 11 is a data management unit based on a preformat address in which recording information can be corrected for errors.
- the present invention is not particularly limited to an optical disk having such three areas.
- the lead-in area 101 and the lead-out area 103 do not exist, the data structure described below can be constructed. Further, the lead-in area 101 and the lead-out area 103 may have a further subdivided configuration.
- the optical disc 100 according to the first embodiment is configured as a two-layer optical disc in which a plurality of data zones 102 and the like are formed in a laminated structure, for example.
- FIG. 2 is a partially enlarged perspective view of the recording surface of the optical disc of the first embodiment.
- the optical disc 100 is placed on a disc-shaped transparent substrate 106.
- a first recording layer 107 (that is, an LO layer) of an irreversible change recording type by heating or the like constituting an information recording surface is stacked (lower in FIG. 2), and further thereon (lower in FIG. 2). Then, a transflective film 108 is laminated.
- the information recording surface of the first recording layer 107 which also has a surface force, One track GT and land track LT are formed alternately.
- the laser beam LB is irradiated onto the group track GT via the transparent substrate 106.
- irreversible change recording is performed by heating the first recording layer 107 according to recording data by irradiating the recording laser beam with the laser beam LB.
- the recording data written in the first recording layer 107 is read by irradiating the laser beam LB with the reproduction laser power weaker than the recording laser power.
- the groove track GT is rocked at a constant amplitude and a constant spatial frequency. That is, the groove track GT is wobbled, and the period of the wobbled 109 is set to a predetermined value.
- address pits called land pre-pits LP indicating pre-format address information are formed on the land track LT.
- the preformat address information may be recorded in advance by modulating the wobble 109 of the groove track GT by a predetermined modulation method such as frequency modulation or phase modulation.
- the second recording layer 207 (ie, L1 layer) is formed on the transflective film 108 (the lower side in FIG. 2), and further thereon (the lower side in FIG. 2).
- a reflection film 208 is formed.
- the reflection film 208 is formed on a partial area of the second recording layer 207.
- the second recording layer 207 is irradiated with the laser beam LB through the transparent substrate 106, the first recording layer 107, and the semi-transmissive reflective film 108, and thus, in substantially the same manner as the first recording layer 107, irreversible by heating or the like. It is configured to enable change recording type recording and playback.
- the second recording layer 207 and the reflective film 208 may be formed on the transparent substrate 106 on which the first recording layer 107 and the transflective film 108 are formed, or may be formed on another substrate. After forming the film, it may be bonded to the transparent substrate 106. Note that a transparent intermediate layer 205 having a strength such as a transparent adhesive is appropriately provided between the transflective film 108 and the second recording layer 207 according to the manufacturing method.
- the focusing position of the laser beam LB is changed.
- recording / reproduction in the first recording layer 107 or recording / reproduction in the second recording layer 207 is performed.
- the optical disc 100 may be a multi-layered optical disc having three or more layers, as shown in FIG. 2, which is not limited to a single-sided two-layer, ie, dual layer. . If the optical disc has three or more layers, a semi-transmissive reflective film is provided in place of the reflective film 208, and a third recording layer and a reflective film (or a semi-transmissive reflective film) are further provided thereon (the lower side in FIG. 2). May be formed in order.
- FIG. 3 is a sectional structural view of the optical disc 100 according to the first embodiment.
- the optical disc 100 has an L0 layer formed of a transparent substrate 106, a first recording layer 107, and a semi-transmissive reflection film 108, and a second recording layer 207, a reflection film 208, and a substrate 206.
- the L1 layer is also formed with force.
- the transflective film 108 and the second recording layer 207 are adhered to each other by a transparent intermediate layer 205 (105) having a strength such as a transparent adhesive, thereby forming the two-layer type optical disc 100.
- the reflection film 208 is formed only in a partial area on the second recording layer 207 (that is, between the second recording layer 207 and the substrate 206). Further, the reflection film 208 is not formed in another area on the second recording layer 207. More specifically, a reflection film is formed on one of the wall surfaces and the bottom surface of the land track LT and the groove track GT, and the other part of the wall surface and the bottom surface of the groove track GT is formed on the other surface. The reflection film 208 is not formed. Therefore, the laser light LB is reflected at a portion where the reflection film 208 is formed, while the laser light LB is not reflected at a portion where the reflection film 208 is formed. Is scattered.
- the thickness of the reflective film 208 is about 50 nm
- the depth of the groove of the groove track GT is about 180 nm
- the intermediate layer 105 It is also preferable that the boundary surface force between the ground layer 205 and the intermediate layer 205 is approximately 200 nm up to the land track LT.
- the numerical value may be in the range of a numerical value applied to a general optical disk without being limited to the numerical value, or may be such that data can be appropriately recorded in each of the L0 layer and the L1 layer. May be in the range of.
- the size (that is, the area) of the bonding surface S11 between the reflective film 208 and the second recording layer 207 and the transflective film 108 And the size of the joint surface S10 between the first recording layer 107 and the first recording layer 107 can be the same.
- heat generated by the irradiated laser beam LB diffuses from the recording layer portion (that is, the first recording layer 107 or the second recording layer 207) to the metal portion (that is, the reflective film 208 or the semi-transmissive reflective film 108).
- the degree of (or conduction) can be made substantially equal between the L0 layer and the L1 layer. In other words, the difference between the thermal conductivity from the first recording layer 107 to the transflective film 108 and the thermal conductivity from the second recording layer 207 to the reflective film 208 is smaller (or ideally, equal or substantially equal). The same).
- FIG. 4 is a sectional structural view of an optical disc according to a comparative example.
- the optical disc 100a according to the comparative example is formed of an L0 layer and an L1 layer, similarly to the optical disc 100 according to the first embodiment.
- the optical disc 100a according to the comparative example has a reflective film 208a formed over the entire area on the second recording layer.
- the bonding surface S21 between the reflective film 208a and the second recording layer 207 is larger than the bonding surface S20 between the transflective film 108 and the first recording layer 107. Therefore, the heat generated by the irradiated laser beam LB is transferred from the second recording layer 207 to the reflective film 208 on the bonding surface S21, and is transmitted from the first recording layer 107 to the reflective film 208 on the bonding surface S20.
- the recording layer partial force at each bonding surface also has a metal portion.
- the degree of heat conduction to the heat can be made equal. For this reason, it is possible to solve the problem that the good recording characteristics seen in the optical disc 100a according to the comparative example cannot be obtained. Thereby, good recording characteristics can be obtained in both the L0 layer and the L1 layer, and there is a great advantage that data can be appropriately recorded in each recording layer. As a result, even when playing back recorded data, data can be properly reproduced. And has a great advantage that the reproduction error rate can be reduced.
- FIG. 5 is a cross-sectional view conceptually showing a part of the process in the method for manufacturing an optical disc according to the first embodiment.
- the optical disc 100 according to the first embodiment is manufactured by separately manufacturing the L0 layer and the L1 layer, and finally bonding the L0 layer and the L1 layer with the intermediate layer 105 (205) including a transparent adhesive or the like.
- a groove corresponding to the groove track GT is formed on the substrate 106 by using, for example, a stamper or the like, and a dye film is applied thereon by using, for example, a spin coating method or the like to form a first recording layer.
- the transflective film 108 is formed by using a metal deposition method.
- a groove corresponding to the group track GT is formed in the substrate 206, and a reflective film 208 is formed thereon by using a metal deposition method.
- the land track LT by depositing gas molecules as a raw material of the reflective film 208 from a direction oblique to the normal to the bottom surface of the groove track GT on the substrate 206, the land track LT
- the reflection film 208 can be formed only on a part of the substrate 206 by acting as a mask for the molecules.
- gas molecules of the reflective film 208 are deposited from a direction in which the reflective film 208 is formed in a desired portion (that is, a portion where the reflective film 208 is originally formed). Is done.
- the reflective film 208 can be formed relatively easily without requiring a special process for forming the reflective film 208.
- the reflective film 208 may be deposited using a masking pattern, or the reflective film 208 may be formed by patterning using a chemical process such as etching or a mechanical process such as polishing. .
- the translucent reflective film 108 and the second recording layer 207 are bonded to each other by the intermediate layer 105 (205) including a transparent adhesive or the like.
- the optical disc 100 can be manufactured.
- a reflection film relatively thinner than a portion where the reflection film 208 is to be formed may be formed. If the film is relatively thin, the heat is diffused accordingly, which is equivalent to the case where the reflective film 208 is not formed. The effect can be obtained.
- the relationship between the L0 layer and the L1 layer is such that the same recording characteristics (or heat conduction characteristics) can be obtained. If you have.
- the size of the bonding surface between the metal (that is, the reflective film or the transflective film) and the recording layer in each recording layer is almost the same.
- the recording characteristics in each recording layer can be made comparable.
- a reflective film or a semi-transmissive reflective film is formed so that the recording characteristics of each recording layer are almost the same.
- the size of the bonding surface in the LO layer and the size of the bonding surface in the L1 layer are substantially the same, so that the size of the LO layer and the L1 layer is Thermal conductivity can be made comparable.
- the recording characteristics of each recording layer can be made almost the same, and appropriate data can be recorded. Further, it is possible to appropriately reproduce the data recorded as described above.
- FIG. 6 is a sectional structural view of the optical disc according to the second embodiment
- FIG. 7 is a sectional view conceptually showing a part of a process in a method of manufacturing the optical disc according to the second embodiment. Note that the same components as those of the optical disk according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the optical disc 100b according to the second embodiment includes a transparent substrate 106, a first recording layer 107, and a semi-transmissive reflective film 108, like the optical disc 100 according to the first embodiment.
- An L0 layer is formed, and an L1 layer is formed from the second recording layer 207, the reflective film 208, and the transparent substrate 206.
- the transflective film 108 and the second recording layer 207 are adhered to each other by, for example, a transparent intermediate layer 205 (105) having a transparent adhesive or the like, thereby forming a two-layer optical disc 100. .
- the substrate 206 has a shape in which a protrusion 206p is further formed on a part of the land track LT of the L1 layer.
- FIG. 1 In the vapor deposition of the reflective film 208 described in the above, the direction of vapor deposition (that is, the angle with respect to the above-mentioned normal) can be made gentle, or the range in which the reflective film 208 is vapor-deposited can be adjusted.
- the projections 206p formed on the land tracks LT serve as barriers for the source gas deposited from a direction oblique to the substrate 206, and The formation of the reflective film 208 in a part can be prevented.
- the protrusion 206p may be formed to have an appropriate size, shape, or the like according to the size (or range, etc.) of the region where the reflection film 208 is to be formed.
- the reflective film 208 may be formed to have an appropriate size, shape, or the like according to the direction in which the reflective film 208 is deposited (that is, the direction in which gas molecules are deposited).
- the same advantages as those of the optical disc of the first embodiment described above can be enjoyed, and the formation of the reflection film 208 can be performed relatively easily. It comes out.
- FIG. 8 is a sectional structural view of the optical disc according to the third embodiment
- FIG. 9 is a sectional view conceptually showing a part of a process in a method of manufacturing the optical disc according to the third embodiment.
- the same components as those of the optical disks according to the above-described first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the optical disc 100c according to the third embodiment includes a transparent substrate 106, a first recording layer 107, and a semi-transmissive reflective film 108, like the optical disc 100 according to the first embodiment.
- An L0 layer is formed, and an L1 layer is formed from the second recording layer 207, the reflective film 208, and the transparent substrate 206.
- the transflective film 108 and the second recording layer 207 are adhered to each other by, for example, a transparent intermediate layer 205 (105) having a transparent adhesive or the like, thereby forming a two-layer optical disc 100. .
- a low thermal conductive film 209 is particularly formed between the second recording layer 207 and the reflective film 208.
- This low thermal conductive film 209 can be formed by vapor deposition using the land track LT as a barrier, as shown in FIG.
- This low thermal conductive film 209 is A member having a lower thermal conductivity than the reflective film 208 is included, and the thermal conductivity is lower than the reflective film 208 as a whole.
- the heat generated by the irradiated laser beam LB is relatively less conducted from the second recording layer 207 to the low thermal conductive film 209, and as a result, the reflection film 208 It is possible to reduce the heat conduction at the joint surface between the second recording layer 207 and the second recording layer 207 (that is, hardly diffuse heat). Accordingly, even if the bonding surface between the reflective film 208 and the second recording layer 207 is larger than the bonding surface between the translucent reflective film 108 and the first recording layer 107, heat is transmitted to the recording layer partial force metal part. The degree can be similar on each joint surface.
- the size of the region where the low thermal conductive film 209 is formed is appropriately adjusted according to the size of the bonding surface in the L0 layer and the bonding surface in the L1 layer. For example, if the difference between the size of the bonding surface in the L1 layer and the size of the bonding surface in the L0 layer is relatively large, it is preferable to form the low thermal conductive film 209 in a wide area. On the other hand, if the difference between the size of the bonding surface in the L1 layer and the size of the bonding surface in the L0 layer is relatively small, it is preferable to form the low thermal conductive film 209 in a narrow region.
- the provision of the low thermal conductive film 209 makes it possible to make the thermal conductivity of the LO layer and the thermal conductivity of the L1 layer approximately equal. As a result, it is possible to receive the same benefits as those of the optical disc according to the first embodiment.
- FIG. 10 is a block diagram of the information recording / reproducing device 300 according to the embodiment of the present invention.
- the information recording / reproducing device 300 has a function of recording the recording data on the optical disc 100 and a function of reproducing the recording data recorded on the optical disc 100.
- the information recording / reproducing device 300 is a device that records information on the optical disk 100 and reads information recorded on the optical disk 100 under the control of the CPU 354.
- the information recording / reproducing apparatus 300 includes an optical disc 100, a spindle motor 351, an optical pickup 3 52, a signal recording / reproducing means 353, a CPU (drive control means) 354, a memory 355, a data input / output control means 306, an operation button 310, a display panel 311, and a bus 357.
- the spindle motor 351 rotates and stops the optical disc 100, and operates when accessing the optical disc. More specifically, the spindle motor 351 is configured to rotate and stop the optical disc 100 at a predetermined speed while receiving spindle servo from a servo unit (not shown) or the like.
- the optical pickup 352 performs recording and reproduction on the optical disc 100, and includes a laser device and a lens. More specifically, the optical pickup 352 irradiates the optical disc 100 with a light beam such as a laser beam at a first power as read light at the time of reproduction and at a second power as write light at the time of recording. Irradiate while modulating.
- a light beam such as a laser beam at a first power as read light at the time of reproduction and at a second power as write light at the time of recording. Irradiate while modulating.
- the signal recording / reproducing means 353 performs recording / reproducing on the optical disc 100 by controlling the spindle motor 351 and the optical pickup 352.
- the memory 355 is used for all data processing in the disk drive 300, such as a buffer area for recording / reproducing data and an area used as an intermediate buffer when converting the data into data used by the signal recording / reproducing means 353. You.
- the memory 355 is composed of a ROM area for storing programs for operating these recorder devices, a buffer area for compression / expansion of video data, and a RAM area for storing variables necessary for the program operation. Is done.
- the CPU (drive control means) 354 is connected to the signal recording / reproducing means 353 and the memory 355 via the bus 357, and controls the entire information recording / reproducing apparatus 300 by giving instructions to each control means. . Normally, software for operating the CPU 354 is stored in the memory 355.
- the data input / output control means 306 controls data input / output from / to the information recording / reproducing device 300 from outside, and stores and retrieves the data into / from the data buffer on the memory 355.
- data input / output is a video signal
- externally received data is compressed (encoded) into an MPEG format when data is input and output to the memory 355, and when data is output, the MPEG format received from the memory 355 is output. Expand (decode) the data Output to the outside.
- the operation control means 307 receives and displays an operation instruction to the information recording / reproducing apparatus 300, and transmits an instruction by an operation button 310 such as recording or reproduction to the CPU 354, and the operation of the information recording / reproducing apparatus 300 during recording or reproduction.
- the operating state is output to a display panel 311 such as a fluorescent tube.
- a household device which is an example of the information recording / reproducing device 300, is a recorder device that records and reproduces a video.
- This recorder device is a device that records a video signal from a broadcast receiving tuner or an external connection terminal onto a disc, and outputs the video signal reproduced from the disc to an external display device such as a television.
- the operation as a recorder device is performed by causing the CPU 354 to execute the program stored in the memory 355.
- the optical disc 100 is a two-layer optical disc as described above, and the first recording layer 107 and the second recording layer 208 have the same thermal conductivity. Both the recording and reproduction of the recording layer 107 and the recording and reproduction of the second recording layer 207 can be satisfactorily executed by the optical pickup 352 using a laser beam having an appropriate power. In addition, there is an advantage that the recording characteristics of the information recorded on each recording layer can be made the same, and the recording quality and reproduction quality can be improved.
- the information recording medium according to the present invention has a recording characteristic equivalent to each recording layer, such as a multi-layer, double-layer, or multiple-layer optical disc in which a plurality of recording layers are laminated on the same substrate.
- a recording characteristic equivalent to each recording layer such as a multi-layer, double-layer, or multiple-layer optical disc in which a plurality of recording layers are laminated on the same substrate.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
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JP2005518007A JPWO2005078716A1 (ja) | 2004-02-18 | 2005-02-15 | 情報記録媒体 |
US10/589,672 US20070184231A1 (en) | 2004-02-18 | 2005-02-15 | Information recording medium |
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JP2004-041779 | 2004-02-18 | ||
JP2004041779 | 2004-02-18 |
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WO2005078716A1 true WO2005078716A1 (ja) | 2005-08-25 |
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PCT/JP2005/002213 WO2005078716A1 (ja) | 2004-02-18 | 2005-02-15 | 情報記録媒体 |
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US (1) | US20070184231A1 (ja) |
JP (1) | JPWO2005078716A1 (ja) |
WO (1) | WO2005078716A1 (ja) |
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US20080027456A1 (en) * | 2006-07-19 | 2008-01-31 | Csaba Truckai | Bone treatment systems and methods |
WO2011162280A1 (ja) * | 2010-06-24 | 2011-12-29 | コニカミノルタオプト株式会社 | 磁気記録媒体 |
Citations (3)
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JP2001184654A (ja) * | 1999-10-13 | 2001-07-06 | Matsushita Electric Ind Co Ltd | 光ディスク、光ディスク再生方法及び光ディスク再生装置 |
JP2002063743A (ja) * | 2000-08-17 | 2002-02-28 | Sanyo Electric Co Ltd | 光ディスクおよびその製造方法 |
JP2004039146A (ja) * | 2002-07-04 | 2004-02-05 | Tdk Corp | 光記録媒体 |
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JPH08124211A (ja) * | 1994-10-19 | 1996-05-17 | Fuji Xerox Co Ltd | 光記録媒体 |
KR100472817B1 (ko) * | 2001-12-07 | 2005-03-10 | 마츠시타 덴끼 산교 가부시키가이샤 | 정보기록 매체와 그 제조 방법 |
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- 2005-02-15 JP JP2005518007A patent/JPWO2005078716A1/ja active Pending
- 2005-02-15 WO PCT/JP2005/002213 patent/WO2005078716A1/ja active Application Filing
- 2005-02-15 US US10/589,672 patent/US20070184231A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001184654A (ja) * | 1999-10-13 | 2001-07-06 | Matsushita Electric Ind Co Ltd | 光ディスク、光ディスク再生方法及び光ディスク再生装置 |
JP2002063743A (ja) * | 2000-08-17 | 2002-02-28 | Sanyo Electric Co Ltd | 光ディスクおよびその製造方法 |
JP2004039146A (ja) * | 2002-07-04 | 2004-02-05 | Tdk Corp | 光記録媒体 |
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US20070184231A1 (en) | 2007-08-09 |
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