CN1879154A

CN1879154A - Multilayer information recording medium and manufacturing method thereof

Info

Publication number: CN1879154A
Application number: CNA2005800012544A
Authority: CN
Inventors: 富山盛央; 锦织圭史; 留河优子
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2004-07-21
Filing date: 2005-07-20
Publication date: 2006-12-13
Anticipated expiration: 2025-07-20
Also published as: CN100543853C

Abstract

There is provided a method for manufacturing a multi-layer information recording medium including a signal substrate (601), at least two information recording units arranged on the signal substrate (601), and a resin layer arranged between adjacent information recording units. The method includes a step for forming the resin layer. In the step for forming the resin layer (603), resin-containing paint is applied via holes of the stencil printing plate to the signal substrate (601) excluding the end portions (601a, 601b) of the signal substrate (601). Via the resin-containing paint applied, the signal substrate (601) is attached to a signal transfer substrate under an air pressure lower than the atmospheric pressure. The resin contained in the resin-containing paint applied is hardened to form a resin layer and then the signal transfer substrate is peeled off from the resin layer.

Description

Multi-layered information recording medium and manufacture method thereof

Technical field

The present invention relates to multi-layered information recording medium that is reproduced as purpose and manufacture method thereof with recording of information or information.

Background technology

In recent years, follow the expansion of the quantity of information of handling by information equipment or image stereo set etc., but data access information recording carriers such as CD easy, that can store the miniaturization of Large Volume Data and corresponding device are gazed at.In addition, studied the high density recordingization of information about information recording carrier, but information recording carrier as high density recording, a kind of information recording carrier is proposed, utilization has and comprises that wavelength is the record reproducing device of the shaven head of 0.85 collector lens for the LASER Light Source of about 400nm and numerical aperture (NA), information is carried out record-playback (for example, with reference to patent documentation 1).In this information recording carrier, for example, to the data that single recording layer can be stored the capacity about 25GB, the data that can store the capacity about 50GB to the recording layer of bilayer.

Then, utilize Fig. 7 A～Fig. 9 J that the structure and the manufacture method thereof of patent documentation 1 described existing multi-layered information recording medium are described.

Employed substrate manufacture was with the manufacture method of mould (stamper) when Fig. 7 A～Fig. 7 F represented to make existing multi-layered information recording medium.At first, photosensitive material such as coating photoresist etc. forms light-sensitive surface 202 (with reference to Fig. 7 A) on glass plate 201.Then, utilize laser 203 to be used for the pattern transfer of pit and guide channel etc. is arrived the exposure (with reference to Fig. 7 B) of light-sensitive surface 202.In Fig. 7 B, 202a is the part (exposure portion) of irradiating laser 203.The photosensitive material of exposure portion is by removing via developing procedure, obtains patterns 204 such as pit and guide channel and is formed on the former dish 205 of optical recording (with reference to Fig. 7 C) on the glass plate 201.Then, utilize methods such as sputter or evaporation on pattern 204, to form conducting film 206.So the shape of pattern 204 is transferred to conducting film 206 (with reference to Fig. 7 C and Fig. 7 D).Then, on conducting film 206, form plated film 207, improve the rigidity of conducting film 206, and make conducting film 206 have thickness (with reference to Fig. 7 E).Then, will peel off from the former dish 205 of optical recording by the duplexer that plated film 207 and conducting film 206 constitute and obtain stamper 208 (with reference to Fig. 7 F).

Fig. 8 represents the sectional view of existing multi-layered information recording medium.This multi-layered information recording medium comprises first signal substrate 301.On first signal substrate 301, dispose first information recording portion 302, on first information recording portion 302, dispose secondary signal substrate 303.Second information recording part 304, hyaline layer 305, and transparency carrier 306 by this arranged in order on secondary signal substrate 303.For transparency carrier 306 being sticked on second information recording part 304 and be provided with hyaline layer 305.

First signal substrate 301 has face that pit and guide channel the are arranged information faces as concaveconvex shape.Utilize the stamper 208 shown in Fig. 7 F, form this information faces during by Outshooting compression shaping method moulding first signal substrate 301.The average thickness of first signal substrate 301 is about 1.1mm.The first information recording portion 302 and second information recording part 304 include recording film and reflectance coating respectively, utilize methods such as sputter or evaporation to form.

Secondary signal substrate 303 is pasted the signal substrate for transfering with male and fomale(M﹠F) on by the light-cured resin of whirl coating coating, after light-cured resin solidifies, form by peel off the signal substrate for transfering from light-cured resin.Stamper 208 shown in signal substrate for transfering and Fig. 7 F similarly has male and fomale(M﹠F).

Transparency carrier 306 is by the enough material transparent of record-playback light are constituted.Hyaline layer 305 is formed by bonding agents such as light-cured resin or pressure-sensitive bonding agents.With the average thickness of transparency carrier 306 and hyaline layer 305 additions is about 0.075mm.Record-playback by the multi-layered information recording medium made like this from transparency carrier 306 side incident record-playback laser.

Then, utilize Fig. 9 A～Fig. 9 J to illustrate in greater detail the manufacture method of existing multi-layered information recording medium.

At first, on the information faces of first signal substrate 401, utilize methods such as sputter and evaporation to form first information recording portion 402.First signal substrate 401 utilizes devices such as attractor, is in the state (with reference to Fig. 9 A) that is fixed on the universal stage 403.Then, utilize coating 404 that dispenser (dispenser) will comprise light-cured resin to be coated in first information recording portion 402 in the mode of the circle of drawing radius with expectation.Then, universal stage 403 is rotated extension coating 404.When extending, because centrifugal force is removed unnecessary resin and bubble.By viscosity, the revolution of universal stage, rotational time, the environmental baseline (temperature and humidity etc.) of at random setting coating 404, the thickness of the coating 404 after the extension may be controlled to predetermined value.After rotation stopped, it is coating material solidified 404 that the rayed by utilizing rayed machine 405 is come, and forms light-cured resin layer 404 ' (with reference to Fig. 9 C).

On the other hand, fixed signal substrate for transfering 406 on universal stage 407.Signal substrate for transfering 406 has the male and fomale(M﹠F) (with reference to Fig. 9 D) same with the stamper 208 shown in Fig. 7 F.Utilize dispenser to be coated on the signal substrate for transfering 406 with the coating 408 that the mode of the circle of drawing the radius with expectation will comprise light-cured resin.Then, universal stage 407 is rotated extension coating 408.The same method of the situation of utilization and coating 404 can be controlled the thickness (with reference to Fig. 9 E) of the coating 408 after the extension.Stop the rotation after the rotation of platform 407, come coating material solidifiedly 408 by the rayed of having utilized rayed machine 409, form light-cured resin layer 408 ' (with reference to Fig. 9 F).

Then, on universal stage 403,, substrate 410 and substrate 411 are overlapped, make universal stage 403 rotations (with reference to Fig. 9 G) under this state with the light-cured resin layer 408 ' and 404 ' the opposed mode across the coating 412 that comprises light-cured resin.By the rotation of universal stage 403, coating 412 Be Controlled (extension) are the thickness of expectation.Then, by having utilized the rayed of rayed machine 405, coating material solidified 412 form light-cured resin layer 412 ' (with reference to Fig. 9 H).Then, peel off signal substrate for transfering 406 from light-cured resin layer 408 '.

In addition, for the light-cured resin that is included in the coating 404, select the good resin of cementability with first information recording portion 402 and light-cured resin layer 412 '.For the light-cured resin that is included in the coating 408, select the good and good resin of fissility with the cementability of light-cured resin layer 412 ' with signal substrate for transfering 406.The viscosity of coating 404,412,408 all is adjusted to about about 150mPas in order to form thin light-cured resin layer.In addition, by light-cured resin layer 404 ', 408 ', 412 ' the integrated thing (being also referred to as resin bed) that constitutes, be equivalent to the secondary signal substrate 303 among Fig. 8.For ease of explanation, the thickness of above-mentioned integrated thing is recorded and narrated to thicker than the thickness of the secondary signal substrate 303 among Fig. 8.

Then, on the opposing face of the face of first signal substrate, 401 sides of light-cured resin layer 408 ', promptly utilize methods such as sputter and evaporation to form second information recording part 413 on second information faces, coating hyaline layer 415 forms coating usefulness, that comprise light-cured resin on second information recording part 413.Then, on coated coating, paste after the transparency carrier 414,, remove the bubble of sneaking in the coating by rotation universal stage 403, and extension coating.Then, light-cured resin is solidified through the light of the 414 pairs of coating of transparency carrier irradiation presetted wavelength, with coating as hyaline layer 415 (with reference to Fig. 9 I).

Patent documentation: (Japan) spy opens the 2002-092969 communique

But,, just produce the trickle thickness change of circumferencial direction or the bigger thickness change of radial direction if utilize whirl coating to form the light-cured resin layer.Particularly, in possessing the multi-layered information recording medium of a plurality of information recording parts, be configured in the addition of the thickness change of the signal substrate (resin bed) between adjacent information recording part, the thickness variation of multi-layered information recording medium integral body increases.

In addition, in whirl coating, coating arrives coated edge part (the outer peripheral edges portion in example shown in Figure 8).Therefore, when light-cured resin is solidified, the light-cured resin that is configured on the edge part expands because of surface tension, its result can increase (with reference to Fig. 9 J) on the other parts of thickness than coated of the light-cured resin layer 404 ' on coated the edge part significantly.This thickness variation causes the thickness variation by light-cured resin layer 404 ', 408 ', 412 ' the integrated thing (resin bed) that constitutes.When using laser to carry out the reproduction of recording of information or information, the thickness variation of resin bed causes the change of spot size by the increase of spherical aberration.In addition, above-mentioned thickness variation can cause bad influence to the focus control of the focus of keeping the hot spot on the information faces or the tracking Control that makes hot spot follow signal train.These results produce the problem that can not carry out the reproduction of recording of information or information to multi-layered information recording medium well.

In addition, in whirl coating,, must make complicated programs such as the rotational speed that is used to control universal stage and revolution in order to suppress above-mentioned thickness variation.Therefore, in whirl coating, above-mentioned thickness variation to be controlled, the problem that increases the productive temp time can be produced.

Summary of the invention

The objective of the invention is to, provide a kind of reproduction or recording of information that carries out information well to reproduce and good multi-layered information recording medium and the manufacture method thereof of production efficiency.

The manufacture method of first multi-layered information recording medium of the present invention, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part, and be configured in resin bed between the neighbor information recording portion, it is characterized in that, comprise the operation that forms above-mentioned resin bed, in the formation operation of above-mentioned resin bed, on the above-mentioned signal substrate except that the edge part of above-mentioned signal substrate, hole by the hole version applies resinous coating, across coated above-mentioned resinous coating, above-mentioned signal substrate of applying and signal substrate for transfering under the air pressure that forces down than atmosphere, the resin solidification that is comprised in the coated above-mentioned resinous coating is formed above-mentioned resin bed, then, peel off above-mentioned signal substrate for transfering from above-mentioned resin bed.

The manufacture method of second multi-layered information recording medium of the present invention, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part, and be configured in resin bed between the neighbor information recording portion, it is characterized in that, comprise the operation that forms above-mentioned resin bed, in the formation operation of above-mentioned resin bed, on the above-mentioned signal substrate for transfering except that the edge part of signal substrate for transfering, hole by the hole version applies resinous coating, across coated above-mentioned resinous coating, above-mentioned signal substrate of applying and above-mentioned signal substrate for transfering under the air pressure that forces down than atmosphere, the resin solidification that is comprised in the coated above-mentioned resinous coating is formed above-mentioned resin bed, then, peel off above-mentioned signal substrate for transfering from above-mentioned resin bed.

The manufacture method of the 3rd multi-layered information recording medium of the present invention, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part, and be configured in resin bed between the neighbor information recording portion, it is characterized in that, comprise the operation that forms above-mentioned resin bed, in the formation operation of above-mentioned resin bed, on the above-mentioned signal substrate for transfering except that the edge part of signal substrate for transfering, hole by the first hole version applies the first resinous coating, on the above-mentioned signal substrate except that the edge part of above-mentioned signal substrate, hole by the second hole version applies the second resinous coating, across the above-mentioned first resinous coating and the above-mentioned second resinous coating, above-mentioned signal substrate of applying and above-mentioned signal substrate for transfering under the air pressure that forces down than atmosphere, the resin solidification that is comprised in the resin that comprised in the first resinous coating and the second resinous coating is formed above-mentioned resin bed, peel off above-mentioned signal substrate for transfering from above-mentioned resin bed then.

The invention effect

According to the present invention, can provide reproduction and high multi-layered information recording medium and the manufacture method thereof of production efficiency that to carry out recording of information or information well.

Description of drawings

Fig. 1 is the sectional view of an example of the multi-layered information recording medium of present embodiment;

Fig. 2 is the enlarging section of the first information recording portion of multi-layered information recording medium shown in Figure 1;

Fig. 3 A is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 3 B is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 3 C is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 3 D is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment;

Fig. 4 A is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 4 B is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 4 C is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 4 D is the sectional view of an example of manufacture method of the multi-layered information recording medium of explanation present embodiment;

Fig. 5 A is the chart of measurement result of thickness of the resin bed of the expression multi-layered information recording medium that constitutes present embodiment,

Fig. 5 B is the chart of measurement result of the thickness of the expression resin bed that constitutes existing multi-layered information recording medium;

Fig. 6 A is other routine sectional view of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 6 B is other routine sectional view of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 6 C is other routine sectional view of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 6 D is other routine sectional view of manufacture method of the multi-layered information recording medium of explanation present embodiment,

Fig. 6 E is other routine sectional view of manufacture method of the multi-layered information recording medium of explanation present embodiment;

Fig. 7 A be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould,

Fig. 7 B be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould,

Fig. 7 C be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould,

Fig. 7 D be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould,

Fig. 7 E be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould,

Fig. 7 F be explanation when making existing multi-layered information recording medium used substrate manufacture with the sectional view of an example of the manufacture method of mould;

Fig. 8 is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation;

Fig. 9 A is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 B is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 C is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 D is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 E is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 F is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 G is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 H is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 I is the sectional view of an example of the manufacture method of the existing multi-layered information recording medium of explanation,

Fig. 9 J is the partial enlarged drawing of Fig. 9 C.

Symbol description

601 first signal substrates

The 601a peripheral edge portion

601b inner periphery portion

602 first information recording portion

603 resin beds

604 second information recording parts

605 resin beds

606 the 3rd information recording parts

607 resin beds

608 the 4th information recording parts

609 hyaline layers

610 center pits

103

104 hole versions

105 resinous coating

105 ' the resinous dope layer

106 chases

107 scraper plates

108 squeegees

701 relief grooves

702 signal substrate for transfering

703 drawdown pumps

704 increased pressure boards

705 ultraviolet money irradiation units

706 center hub

903 rollers

904 ultraviolet irradiating machines

Embodiment

According to the manufacture method of the first～three multi-layered information recording medium,, can suppress the protuberance on the edge part of signal substrate, so can provide thickness variation repressed multi-layered information recording medium to being used to separate the resin bed of neighbor information recording layer portion.Therefore, can provide a kind of multi-layered information recording medium, can suppress the change of the spot size that the increase by spherical aberration causes, stably carry out focus control and tracking Control.That is, can provide the multi-layered information recording medium that carries out the reproduction of recording of information or information well.

In addition, in the manufacture method of first～the 3rd multi-layered information recording medium, applying signal substrate and signal substrate for transfering under the air pressure that forces down than atmosphere are blended in the resin bed so suppressed bubble, have suppressed bubble and have sneaked in the light path.Thus, in the multi-layered information recording medium that the manufacture method of utilizing above-mentioned the first～three multi-layered information recording medium is made, the change of the spot size that the increase by spherical aberration causes be can suppress, focus control and tracking Control stably carried out.

In addition, in the manufacture method of the first～three multi-layered information recording medium, do not need to be used to control complicated programs such as the rotational speed of universal stage and revolution, Billy forms the situation of resin bed with whirl coating, can shorten the productive temp time, the production efficiency height.

In addition, in the manufacture method of the first～three multi-layered information recording medium, utilize silk screen print method to apply resinous coating,, can promptly form the more uniform resin bed of thickness so Billy applies the situation of resinous coating with whirl coating.

As mentioned above, according to the manufacture method of the first～three multi-layered information recording medium, can provide the multi-layered information recording medium that carries out the reproduction of recording of information or information well high productivity.

In the manufacture method of the first～three multi-layered information recording medium, preferably in the formation operation of resin bed, apply after the resinous coating, through after the schedule time, applying signal substrate and signal substrate for transfering.This be because, in the above-mentioned schedule time, carry out the smoothing of concave-convex surface of the resinous coating of the hole coating by the hole version naturally, carry out the applying of signal substrate and signal substrate for transfering well.

In the manufacture method of the first～three multi-layered information recording medium, in the formation operation of resin bed, preferably apply after the resinous coating, before applying signal substrate and signal substrate for transfering, heating is coated in the resinous coating on the signal substrate.This is because promptly carry out the smoothing of the concave-convex surface of coated resinous coating.

The heating of coated resinous coating preferably reaches 40 ℃～120 ℃ mode with the surface temperature of above-mentioned resinous coating and carries out.This is because can suppress the generation of the bending of the multi-layered information recording medium that caused by heating, and improve the efficient of the smoothing of resinous coating.According to same reason, the heating of coated resinous coating is more preferably the mode that surface temperature with above-mentioned resinous coating reaches 40 ℃～100 ℃ and carries out.

In the manufacture method of the first～three multi-layered information recording medium, in the formation operation of above-mentioned resin bed, preferably in the middle of the above-mentioned resinous coating of coating, utilize hot blast to heat above-mentioned resinous coating.In addition, preferably also utilize hot blast to heat for above-mentioned coated resinous coating.By and with heating and blowing, more efficient and carry out the smoothing of resinous coating effectively can suppress to sneak into bigger bubble.Preferably reaching 30 ℃～100 ℃ mode with the surface temperature of above-mentioned resinous coating with the heating of the resinous coating of hot blast carries out.

The resin that is included in the resinous coating comprises light-cured resin, and for example ultraviolet curable resin is better as light-cured resin.Ultraviolet curable resin only reacts curing to the light high sensitive ground of the wavelength of ultraviolet range.Therefore, in the formation operation of resin bed, the electromagnetic wave of coated resinous coating (ultraviolet curable resin) use than the wavelength region may of ultraviolet line length heated, ultraviolet curable resin can not solidify because of this electromagnetic wave yet.Therefore, heat resinous coating, ultraviolet curable resin is solidified and promptly carry out the smoothing of coated resinous coating by using electromagnetic wave than the wavelength region may of ultraviolet line length.

The resin that is included in the resinous coating comprises under the situation of uv curing resin, and the heating of coated resinous coating preferably utilizes the electromagnetic wave than the wavelength region may of ultraviolet line length to carry out.This is to carry out the smoothing of resinous coating because ultraviolet curable resin is solidified.

The viscosity of coated resinous coating is 30mPas～4000mpas (30cps～4000cps) preferably.This is because can pass through the coating of resinous coating in the hole of hole version well, and the resinous coating that can suppress to be coated on the signal substrate flows and suppresses the projection of the resin bed of edge part to the edge part of signal substrate.Now be more preferably 100mPas～4000mPas (100cps～4000cps) according to same by, the viscosity of coated resinous coating.

In the manufacture method of the first～three multi-layered information recording medium, formation operation for resin bed, after signal substrate and signal substrate for transfering are fitted, utilize pressue device that the signal substrate for transfering is pressurizeed, with the resin solidification that is included in the resinous coating.This is because carry out the signal transfer printing well.

The resin that is included in the resinous coating comprises under the situation of light-cured resin, the signal substrate for transfering is transparent for the employed irradiates light of resin solidification, preferably above-mentioned irradiates light is shone on the resinous coating through the signal substrate for transfering, light-cured resin is solidified.According to this method, can be easily and form resin bed effectively.

The light-cured resin that is included in the resinous coating is under the situation of ultraviolet curable resin, and the employed irradiates light of the curing of ultraviolet curable resin is as long as use the light of its wavelength region may in the ultraviolet range.In the first～three multi-layered information recording medium manufacture method, resinous coating comprises under the situation of ultraviolet curable resin, and preferably the signal substrate for transfering contains polyolefin.This is because polyolefin is the village material good with the fissility of ultraviolet curable resin, can peel off the signal substrate for transfering from resin bed with less power, can also suppress resin attached on the signal substrate for transfering.

In the first～two multi-layered information recording medium manufacture method, signal substrate is have center pit discoid, in the formation operation of resin bed, and the resinous coating of coating on the signal substrate of the peripheral edge portion of signal substrate and inner periphery portion preferably.

In the 3rd multi-layered information recording medium manufacture method, signal substrate and signal substrate for transfering are that to have a center pit discoid, in the formation operation of resin bed, the coating first resinous coating on except the signal substrate for transfering of the peripheral edge portion of signal substrate for transfering and inner periphery portion preferably, the coating second resinous coating on the signal substrate of the peripheral edge portion of signal substrate and inner periphery portion.

The information recording carrier of present embodiment utilizes the manufacture method of the first～three multi-layered information recording medium to make, and the thickness variation of resin bed is less.The change of the optical path length till therefore, from the face of the light incident side of the light of multi-layered information recording medium to each information faces is also few.In addition, in the information recording carrier of present embodiment, the change of the spot size that the increase by spherical aberration causes can be suppressed, focus control and tracking Control can also be stably carried out.Therefore, in information recording carrier of the present invention, can carry out the reproduction of recording of information or information well.

Following with reference to the description of drawings embodiments of the present invention.In the present embodiment, so-called Blu-ray Disc (dish of blu-ray format) is described as multi-layered information recording medium for example, still, multi-layered information recording medium of the present invention is not limited thereto, and for example can be storage card, CD, DVD etc.

(embodiment 1)

Fig. 1 is the sectional view of the multi-layered information recording medium of present embodiment.As shown in Figure 1, multi-layered information recording medium has first signal substrate 601 and is configured in first information recording portion 602 on the information faces of first signal substrate 601.First signal substrate 601 has face that pit and guide channel the are arranged information faces as concaveconvex shape.In addition, multi-layered information recording medium has the secondary signal substrate 603 that is configured on the first information recording portion 602.Secondary signal substrate 603 has face that pit and guide channel the are arranged information faces (with the opposite face of face of first signal substrate, 601 sides) as concaveconvex shape.Multi-layered information recording medium has second information recording part 604 that is configured on this information faces.Multi-layered information recording medium has the 3rd signal substrate 605 that is configured on second information recording part 604.The 3rd signal substrate 605 has face that pit and guide channel the are arranged information faces (with the opposite face of face of secondary signal substrate 603 sides) as concaveconvex shape.Multi-layered information recording medium has the 3rd information recording part 606 that is configured on this information faces.Multi-layered information recording medium has the 4th signal substrate 607 that is configured on the 3rd information recording part 606.The 4th signal substrate 607 has pit is arranged, the face of guide channel is as the information faces (with the opposite face of face of the 3rd signal substrate 605 sides) of concaveconvex shape.Multi-layered information recording medium has and is configured in the 4th information recording part 608 on this information faces and is configured in hyaline layer 609 on the 4th information recording part 608.

In addition, in this application, the second～four signal substrate 603,605,607 also is called resin bed 603,605,607.

First signal substrate 601 for the bending that suppresses information recording carrier, improve the rigidity of information recording carrier and guarantee interchangeability with (CD, the DVD etc.) of other CD, form by the plectane of external diameter φ 120mm, average thickness 1.1mm.As the material of first signal substrate 601, for example can enumerate polycarbonate and propylene resin etc.In multi-layered information recording medium shown in Figure 1, as the material use polycarbonate of first signal substrate 601.

Use the stamper 208 shown in Fig. 7 F, when moulding first signal substrate 601, form the information faces of concaveconvex shape.First signal substrate 601 for example can utilize the methods of forming such as Outshooting compression shaping method to form.First signal substrate 601 heart portion therein has the center pit 601 of diameter phi 15mm.When the recording of information that is undertaken by player reproduces, rotatably keep multi-layered information recording medium by this center pit 610 in the precalculated position of player.

Resin bed (the second～four signal substrate) 603,605,607 and the hyaline layer 609 that are formed on the first signal base 601 comprise under the situation of light-cured resin, produce photocuring and shrink when forming these layers.But under the situation on information faces being, this photocuring contraction brings bending can for first signal substrate 601.Therefore, after forming resin bed 603,605,607 and hyaline layer 609, first signal substrate 601 is pre-formed for having opposite curvature, so that do not produce bending on multi-layered information recording medium.

The multi-layered information recording medium of present embodiment is to reproduce under the situation of special-purpose multi-layered information recording medium (ROM), and first information recording portion 602 is for example with Al, Ag, Au, Si, SiO ₂As material, utilize methods such as sputter or evaporation to form in metal or semiconductor, dielectric.

Then, utilizing Fig. 2 is that the structure of first information recording portion 602 of the situation of write-once (Write Once) type multi-layered information recording medium describes to the multi-layered information recording medium of present embodiment.

The reflectance coating 503 that first information recording portion 602 for example is made of AlCr, first deielectric-coating 504 that is made of ZnS, the recording film 505 that is made of TeOPd, second deielectric-coating 506 that is made of ZnS are from the structure of first signal substrate 601 (with reference to Fig. 1) side by this arranged in order.These layers for example all utilize, and method such as sputter or evaporation forms.The material of reflectance coating 503 can replace AlCr and similarly use with the material of metals such as Ag or Au as major component with the multi-layered information recording medium that reproduces special use.

Also make the structure same for second information recording part 604, the 3rd information recording part 606 and the 4th information recording part 608 with first information recording portion 602.Adjust reflectance coating 503 thickness, remove reflectance coating 503 and/or adjust the thickness of first deielectric-coating 504 and recording film 505, thus, can adjust the optical characteristics of multi-layered information recording medium.In addition, the first～four information recording part can be made the structure that also has pigmented film (not shown) etc.

Resin bed 603 (secondary signal substrate) is almost transparent to record-playback light.Resin bed 603 is preferably for example formed by the ultraviolet curable resin that with the acrylic resin is major component.Ultraviolet curable resin only reacts curing sensitively to the light height of the wavelength of ultraviolet range.Therefore, in the formation operation of resin bed 603, utilization is heated the resinous coating of coating on the first information recording portion 602 than the electromagnetic wave of the wavelength region may of ultraviolet line length, and the ultraviolet curable resin that is included in the resinous coating also can not solidify because of this electromagnetic wave.Therefore, heat resinous coating, ultraviolet curable resin is solidified, carry out the smoothing of resinous coating surface by using electromagnetic wave than the wavelength region may of ultraviolet line length.

Resin bed 603 is for example following to be made like that.The resinous coating (only being called " coating " sometimes) that will comprise ultraviolet curable resin forms the hole of the hole version of usefulness, coating on first signal substrate 601 by resin bed 603.On coated coating, under the state that the signal substrate for transfering that will have an information faces is pushed in the relative mode of this information faces, the ultraviolet curable resin that utilizes ultraviolet ray to make to be included in the coating solidifies.Then, peel off the signal substrate for transfering from the ultraviolet curable resin that solidifies.In addition, resinous coating, coating on first signal substrate 601 except that the edge part (peripheral edge portion 601a, the 601b of inner periphery portion) of first signal substrate 601.Be formed with first information recording portion 602 on first signal substrate 601, coating just is coated on first signal substrate 601 across first information recording portion 602.

For resin bed 605,607 (the three～four signal substrate) also is to use and same material and the method for resin bed 603 (secondary signal substrate), forms same shape.

Resinous coating can comprise the solvent that is used for viscosity and adjusts, beginning hardening agent etc. except resins such as ultraviolet curable resin.

609 pairs of record-playback light of hyaline layer are almost transparent.Hyaline layer 609 is for example preferably formed by the ultraviolet curable resin that with the acrylic resin is major component.Also use with the same method of resin bed for hyaline layer 609 and to form.Hyaline layer 609 covers the first～four information recording part 602,604,606,608 and resin bed 603,605,607, for example forms its part and engages with the peripheral edge portion 601a and the 601b of inner periphery portion of first signal substrate 601.

Then, utilize the example of manufacture method of the multi-layered information recording medium of Fig. 3 A～Fig. 6 E explanation present embodiment.

Fig. 3 A～Fig. 4 D is the sectional view of an example of the multi-layered information recording medium manufacture method of explanation present embodiment.

In the manufacture method of present embodiment, at first, on the information faces of first signal substrate 601, form the first information recording portion 602 that comprises recording film and reflectance coating etc.Recording film and reflectance coating etc. all utilize methods such as sputter or evaporation to form.First signal substrate 601 by devices such as evacuators, is fixed on the platform 103 with the configuration of the face opposing face side of first information recording portion side as required.

Then, on first signal substrate 601, empty predetermined space configuration has the hole version 401 of the mesh of preliminary dimension.Hole version 104 is used following hole version: to the face opposing face of first signal substrate, 601 sides on the resinous coating 105 supplied with, when being coated on the first information recording portion 602, coating amount can be restricted to suitable amount by mesh, can apply uniformly.

The method for making of hole version 104 then, is described.At first, stick hole version material on chase 106, version applies photosensitive emulsion with material in the hole.Then, utilize shadow mask to hide the part of except that the coated precalculated position of hole version (forming the position in a plurality of holes) with material.Utilize exposure device to of the ultraviolet ray of hole version with material irradiation certain hour.The photosensitive emulsion that utilizes ultraviolet ray irradiation exposure washed by injection water etc. develop, obtain hole version 104.

In addition, the material of chase 106 can use for example timber, aluminium, stainless steel, plastics etc., wherein the high aluminium of light weight and rigidity preferably.The hole version can be used for example resin materials such as silk, nylon (registered trademark), stainless steel, polyethylene terephthalate with material, wherein, and preferably for being out of shape little stainless steel from outer applied pressure.Photosensitive emulsion for example can use diazo salt or the dichromate emulsion at PVA or vinyl acetate emulsion mixed dissolution.The hole version is with the mesh count (radical of each inch wire rod) in the precalculated position of material preferably 150～600.If mesh count is in this scope, can not produce passing through bad or applying inhomogeneously of resinous coating, and apply resinous coating.In addition, the hole of hole version is not limited by mesh.

[table 1]

	The viscosity of ultraviolet curable resin (mPas)
	The viscosity of ultraviolet curable resin (mPas)												5	10	20	30	40	50	…	3500	4000	4100	4200	4300
	The state of resin bed	×	×	×	○	○	○	…	○	○	△	△	5	10	20	30	40	50	…	3500	4000	4100	4200	4300	×
Resin arrives substrate end-face			×	×	○	○	○	…	○	○	△	△	Well						Produce in uneven thickness		Do not shift				×

Table 1 is the form of relation of the state of expression viscosity of resinous coating and resin bed.As shown in table 1, if the viscosity of resinous coating is 30mPas～4000mPas (30cps～4000cps), can form good resin bed as can be known.Under the low situation of the viscosity ratio 30mPas of resinous coating (30cps), some can flow to the substrate end-face of first signal substrate 601 coated resinous coating.If the viscosity of resinous coating surpasses 4000mPas (4000cps), resinous coating is difficult to the hole by the hole version, so be difficult to applying coatings.According to more than, descend if consider the viscosity that temperature variation and humidity because of environment change the resinous coating that causes, the viscosity of resinous coating is 100mPas～4000mPas (100cps～4000cps) preferably.

In addition, in this application, viscosity is the value of measuring with rotational viscosimeter.The assay method that has used the viscosity of rotational viscosimeter is torque and the proportional principle of viscosity of utilizing rotor.Rotor for example uses columnar roller or fin.Torque is meant that the rotor utilization that will put in the test portion (resinous coating) continues the needed power of rotation by the motor that bar-shaped axle links with certain speed.

By the formation zone in the hole in the selecting hole version 104, limit the coating scope of resinous coating.In the present embodiment, for example than in the outer part zone of the internal diameter of first signal substrate 601 (for example, leave more than the 10.5mm zone) from the center, and than in the inner part zone of external diameter (for example, apart from center 59.75mm with interior distance), use can apply the hole version 104 (with reference to Fig. 3 A) of resinous coating 105.If use such hole version 104, on first signal substrate 601 except that edge part 601a, the 601b of first signal substrate 601, be in the circle of diameter phi 119.5mm, outside the circle of diameter phi 21mm, can apply resinous coating 105.

In addition, in an above-mentioned example, the peripheral edge portion 601a of first signal substrate 601 is from the zone of periphery less than 0.25mm, the 601b of inner periphery portion of first signal substrate 601 is from the zone of interior week less than 3mm, but, in the manufacture method of the multi-layered information recording medium of present embodiment, edge part is not limited to this.

The multi-layered information recording medium of present embodiment for example has under the situation in periphery information signal zone, and preferably the peripheral edge portion 601a of first signal substrate 601 for example than periphery information signal zone in the outer part.For example, in Blu-ray Disc,, become peripheral edge portion 601a apart from the distance at the center zone far away than 58.5mm.In addition, in periphery information signal zone, record information about the periphery of multi-layered information recording medium.

The multi-layered information recording medium of present embodiment is for example under the situation of the injury protection ring that has the surface that is used to prevent multi-layered information recording medium the interior week than first signal substrate 601 in the inner part; the 601b of inner periphery portion of so-called first signal substrate 601; be illustrated in than in the protection ring zone in the outer part, than first information recording portion 602 zone in the inner part.

The multi-layer information of present embodiment note medium in the protection ring outside, for example has sometimes and utilizes clamp system to be fixed on zone (following also be called (clamping region)) on the turning axle.For example, in Blu-ray Disc, clamping region is zone below the above 11.5mm of 6.5mm apart from the distance at center.Multi-layered information recording medium has under the situation of clamping region, and the 601b of inner periphery portion of first signal substrate 601 becomes in first signal substrate 601 than clamping region zone or clamping region and than clamping region zone in the inner part in the inner part.On clamping region,, then undesirable if there is resin bed in the part.

The multi-layered information recording medium of present embodiment for example can have interior all information signals zone of having write down with the information of the interior Zhou Youguan of multi-layered information recording medium.Under this situation, the 601b of inner periphery portion of first signal substrate 601 for example can be in first signal substrate 601 than interior all information signals zone in the inner part.Under this situation, for example in Blu-ray Disc, become the 601b of inner periphery portion apart from the distance at the center zone nearer than 21.0mm.

Like this, in the manufacture method of the multi-layered information recording medium of present embodiment, formation operation for resin bed, on first signal substrate of the edge part that removes first signal substrate, hole by the hole version applies resinous coating, can suppress protuberance on the edge part (peripheral edge portion and inner periphery portion) of first signal substrate, resin bed or outstanding to resin bed.Thus, a kind of multi-layered information recording medium can be provided, suppress thickness variation, and the change of optical path length in peripheral edge portion and the inner periphery portion, as a result of can suppress the change of the spot size that the increase by spherical aberration causes, also stably carry out focus control and tracking Control.In addition, in the manufacture method of the multi-layered information recording medium of present embodiment, can provide the multi-layered information recording medium that dimensional accuracy is good, outward appearance is good.

Resinous coating 105 carries out as follows to the coating (transfer) of first signal substrate 601.At first, slip scraper plate 107 on hole version 104 is filled resinous coating 105 (with reference to Fig. 3 A and B) in a plurality of holes of hole version 104.Then, in the mode that hole version 104 is applied predetermined pressure squeegee 108 is slided.Thus,, from the hole, extrude, be coated to (with reference to Fig. 3 C) on first signal substrate 601 the resinous coating that is filled in the hole of hole version 104.

In addition, the coating of resinous coating 105 on first signal substrate 601 is not limited to said method.According to the kind of hole version 104 and resinous coating, resinous coating 105 passes through the hole of hole version 104 easily.Under this situation, squeegee 108 is slided, just can carry out of filling and the coating to first signal substrate 601 on of resinous coating 105 to a plurality of holes.

In the present embodiment, the average thickness that resulting multi-layered information recording medium forms resin bed for example is 10 μ m～25 μ m, and to possess numerical aperture be that the record reproducing head of the LASER Light Source of 0.85 object lens and wavelength 405nm can record-playback so that utilize.Scraper plate 107 and squeegee 108 utilize materials such as silicon rubber or polyurethane, stainless steel to form.The thickness (amount) that is applied to the resinous coating 105 on first signal substrate 601 decides according to angle or the pressure that is produced by machine for brushing 108, the translational speed of machine for brushing 108 etc. of squeegee 108 with respect to hole version 104.Therefore, preferably be adjusted into above-mentioned angle, pressure and constant airspeed.

The resinous coating that is applied on first signal substrate 601 applies through the hole of via hole version 104, therefore, after coating just, has application pattern (hole version pattern).Therefore, behind the resinous coating of coating,, carry out the planarization (smoothing of concave-convex surface) of resinous coating so that relax the concavo-convex degree on resinous coating 105 surfaces that produce by application pattern by placing the schedule time.The above-mentioned schedule time, along with the differences such as viscosity of resinous coating, general 4 seconds～120 seconds degree preferably.For example, the viscosity of resinous coating is under the situation of 30mPas～4000mPas during coating, under the situation that the viscosity ratio of resinous coating is lower and thixotropy (チ Network ソ) is low, just begins planarization immediately after the coating, with about the 4 seconds surfaces cunning that flattens.On the other hand, under the situation that the viscosity ratio of resinous coating is higher and thixotropy is high, it is slow that resinous coating flows, and is difficult to carry out planarization, the surface cunning that flattens about 120 seconds.In addition, the degree of " smoothly " is so long as it is just enough to carry out the degree of applying of first signal substrate 601 and signal substrate for transfering 702 (with reference to 4A) well.

If the resinous coating that heating is coated promptly carries out planarization, and is even more ideal.As heat treatment apparatus, for example, use far infra-red heater better, so that can not solidify the ultraviolet curable resin that comprises in the resinous coating.

[table 2]

	The surface temperature of resin (℃)
	The surface temperature of resin (℃)												20	30	40	50	60	…	90	100	110	120	130	140
	Application pattern	×	△	○	○	○	…	○	○	○	○	△	20	30	40	50	60	…	90	100	110	120	130	140	×
Application pattern is arranged		×	△	○	○	○	…	○	○	○	○	△	Normally								Have rotten				×

The relation of the surface temperature of the resinous coating of table 2 expression and the residual degree of application pattern.The residual degree of application pattern is confirmed by visual.As shown in table 2, if resinous coating is heated to surface temperature reaches 40 ℃～120 ℃ scope, then can suppress the rotten of ultraviolet curable resin, can roughly eliminate concavo-convexly, carried out best planarization.If consider the distortion of first signal substrate 601, the surface temperature of resinous coating is more preferably the scope at 40 ℃～100 ℃.

In addition, use contactless radiation thermometer to measure surface temperature.

Like this, if coated resinous coating is heated to its surface temperature reaches predetermined temperature, can on first signal substrate 601, promptly form the resinous dope layer 105 ' (with reference to Fig. 3 D) of uniform thickness.

In the manufacture method of the multi-layered information recording medium of present embodiment, in the middle of the resinous coating of coating, can utilize hot blast to heat resinous coating.In addition, can utilize hot blast to heat coated resinous coating.This be because, by and with the heating and the air-supply, can more efficiently and carry out the smoothing of resinous coating effectively, can also suppress sneaking into of air pocket.Preferably reaching 30 ℃～100 ℃ mode with the surface temperature of above-mentioned resinous coating by the heating of the resinous coating of hot blast carries out.

Fig. 4 A～Fig. 4 D is in the manufacture method of the multi-layered information recording medium of present embodiment, and expression is transferred to signal the sectional view of one example of the method for resinous coating.First signal substrate 601 that has formed resinous dope layer 105 ' on an interarea is configured in the relief groove 701.In the center pit 611 of the central part that is formed at first signal substrate 601, pass center hub 706, first signal substrate 601 is fixed on preposition.Simultaneously, signal substrate for transfering 702 also is configured in the relief groove 701.Signal substrate for transfering 702 for example preferably contain with the good material of the fissility of ultraviolet curable resin be polyolefin.Polyolefin can form easily because of good forming ability information faces with concaveconvex shape aspect, also be suitable as the material of signal substrate for transfering 702.

In addition, polyolefin has the character of transmitting UV, if through 702 pairs of resinous coating irradiation ultraviolet radiations of signal substrate for transfering, can be cured the ultraviolet curable resin that is included in the resinous coating expeditiously.For example can enumerate the cycloolefin of cyclopentadiene as polyolefin as raw material.

The average thickness of first signal substrate 601 for example is under the situation of 1.1mm, and the average thickness of signal substrate for transfering 702 is 0.6mm preferably for example.If use the signal substrate for transfering 702 thinner, then, carry out peeling off of signal substrate for transfering 702 easily because the rigidity that produces because of the difference of thickness is poor than first signal substrate 601.

Can be in the relief groove 701 by drawdown pump 703 exhausts such as drum pump or mechanical boosters, predetermined air pressure at short notice can reduce pressure.In the present embodiment, when in relief groove 701, for example reaching the vacuum tightness below the 100Pa, the signal substrate for transfering 702 and first signal substrate 601 are fitted across resinous dope layer 105 ' and first information recording portion 602.

At this moment, pressurize, go up the male and fomale(M﹠F) of transfer printing signal substrate for transfering 702 as information faces at resinous dope layer 105 ' by 704 pairs of signal substrate for transfering 702 of increased pressure board.Because be depressurized in the relief groove 701, so do not sneak into bubble between resinous dope layer 105 ' and the signal substrate for transfering 702, can fit signal substrate for transfering 702 and first signal substrate 601 (with reference to Fig. 4 B).In addition, when the hole by the hole version applies resinous coating 105 on first signal substrate 601, can remove the bubble of sneaking in the resinous coating.

Then, first signal substrate 601 and the signal substrate for transfering 702 of fitting taken out from relief groove 701.Then, the ultraviolet lamp 705 of the top by being configured in signal substrate for transfering 702, through signal substrate for transfering 702, to resinous dope layer 105 ' irradiation ultraviolet radiation, the ultraviolet curable resin that is included in the resinous coating is solidified, with resinous dope layer 105 ' as resin bed (with reference to Fig. 4 C).

Then, the ultraviolet curable resin after solidifying is peeled off signal substrate for transfering 702, at this moment, preferably is blown into pressurized air between signal substrate for transfering 702 and resin bed.Like this, form resin bed 603 (with reference to Fig. 4 D) with information faces.

Then, similarly form second information recording part 604 by methods such as sputter and first information recording portion 602.Resin bed 605 also similarly forms with resin bed 603.In addition, the three～four information recording part 606,608, resin bed 607 form similarly.Then, on the 4th information recording part 608, form hyaline layer 609.Hyaline layer 609 use to record-playback light almost transparent (having transmittance), form with the ultraviolet curable resin of acrylic resin as principal ingredient.Hyaline layer 609 also similarly forms (with reference to Fig. 1) by the coating that coating hyaline layer 609 on Kong Zaidi four information recording parts 608 grades of hole version forms usefulness with resin bed.

The average thickness of the hyaline layer 609 directly over the 4th information recording part 608 decides according to the thickness that is clipped in the resin bed 603,605,607 between hyaline layer 609 and the first information recording portion 602, so that the surface of hyaline layer 609 becomes about 100 μ m to the distance of first information recording portion 602.Above-mentioned 100 μ m are the recoverable boundaries by the spherical aberration of the record reproducing head generation of current use.

For example, the average thickness of resin 603,605,607 is respectively under the situation of 25 μ m, and the average thickness of hyaline layer 609 is made as 25 μ m (100 μ m-25 μ m * 3 layers).In addition, the average thickness of resin bed 603,605,607 is under the situation of 10 μ m, and the average thickness of hyaline layer 609 is made as 70 μ m (100 μ m-10 μ m * 3 layers).In addition, the thickness of each thickness of the first～four information recording part and resin bed and hyaline layer 609 relatively approaches certain order of magnitude, so can ignore.

In the manufacture method of multi-layered information recording medium in the present embodiment, the resin bed 603,605,607 and first～the 4th information recording part 602,604,606,608 all are formed on first signal substrate 601 except the edge part of first signal substrate 601 (with reference to Fig. 1).Therefore, hyaline layer 609 can form with the peripheral edge portion 601a and the 601b of inner periphery portion of first signal substrate 601 and engage.Therefore, with the first～four information recording part 602,604,606,608 and resin bed 603,605,607, can utilize the hyaline layer 609 and first signal substrate 601 to surround.Polycarbonate and the curing ultraviolet curable resin before and the cementability height of the ultraviolet curable resin after the curing.Therefore,, use the material of ultraviolet curable resin, then can suppress the situation that the resin bed that caused by reasons such as moistures and information recording part are peeled off as hyaline layer 609 if use the material of polycarbonate as first signal substrate 601.

Fig. 5 A represents to utilize the measurement result of thickness of the resin bed of the multi-layered information recording medium that the manufacture method of the multi-layered information recording medium of present embodiment makes, and Fig. 5 B represents to constitute the measurement result of thickness of the resin bed of existing multi-layered information recording medium.The thickness of resin bed is to measure at interval with 15 degree respectively on the circumference of radius centered 20mm, 30mm, 40mm, 50mm, 59mm at the center with multi-layered information recording medium.That is, the thickness of resin bed has not repeatedly been measured in the measuring point to 120 positions.

In addition, measured the thickness of resin bed by the method for utilizing the interference of light effect (PV method).This measuring method has been utilized following character: produce interference mutually by the light of the surface reflection of resin bed and light by its backside reflection, when these catoptrical phase places are consistent intensity increase, strength reduction during skew.Observe the interference figure that changes along with the wavelength change intensity of reflected light, peak wavelength λ 1 and valley wavelength X 2 according to this pattern are relations of the integral multiple of optical path difference 2nd (refractive index of n=resin bed, the thickness of resin), can draw the thickness d of resin bed.

In the measurement of the thickness of resin bed, use the laser wave long laser more used than the record-playback of multi-layered information recording medium.This be because, be used in the light source of equiwavelength's light under the situation of device of the thickness of measuring resin bed penetrating with the laser that the information that writes down on the multi-layered information recording medium is carried out record-playback, produce optical diffraction by the information that is recorded in information recording part, this optical diffraction causes bad influence to the thickness measure of resin bed.For example, when using the laser that the blue laser about wavelength 400nm uses as record-playback, use red laser about wavelength 650nm to measure the thickness of resin bed.

Average thickness 20 μ m have been formed the inhomogeneous of thickness under the situation of resin bed as the desired value of resin layer thickness, shown in Fig. 5 A, in the multi-layered information recording medium of present embodiment, suppressed in ± 1 μ m.On the other hand, shown in Fig. 5 B, in existing multi-layered information recording medium, the inhomogeneous ratio ± 1 μ m of the thickness of resin bed is big.In addition, be made as the average thickness of the mean value of 120 resin layer thickness of measuring as resin bed if will measure number in the unduplicated mode in measuring point, then the difference of the maximal value of resin layer thickness and minimum value is below 10% of above-mentioned average thickness.

In above-mentioned, the resinous coating of coating on first signal substrate 601 except that the edge part of first signal substrate 601, across coated resinous coating, first signal substrate 601 and signal substrate for transfering 702 are fitted under the air pressure that forces down than atmosphere, formed resin bed 603 with information faces, but the manufacture method of the multi-layered information recording medium of present embodiment is not limited to this.For example, also can on the signal substrate for transfering 702 except that the edge part of signal substrate for transfering 702, apply resinous coating, across coated resinous coating, first signal substrate 601 and signal substrate for transfering 702 are fitted under the air pressure that forces down than atmosphere, form resin bed with information faces.

In addition, for example by using the lower resinous coating of viscosity ratio, be difficult to form under the situation of resin bed of thickness of expectation, can on the signal substrate for transfering 702 except that the edge part of signal substrate for transfering 702, apply the first resinous coating in the hole by the first hole version, hole by the second hole version on first signal substrate 601 except that the edge part of first signal substrate 601 applies the second resinous coating, across resinous coating, first signal substrate 601 and signal substrate for transfering 702 are fitted under the air pressure that forces down than atmosphere, form resin bed with information faces.The first hole version and the second hole version are used respectively with the same hole version of the hole version that illustrates with Fig. 3 A～Fig. 3 D 104 and are got final product.

The composition of the first resinous coating and the second resinous coating can be identical, also can be different.The first resinous coating and the second resinous coating comprise respectively under the situation of light-cured resin and adhesive resin (for example, the copolymer of propylene resin), for example for fissility that improves signal substrate for transfering 702 and resin bed and/or the cementability that improves first signal substrate 601 and resin bed, the amount that makes the light-cured resin in the first resinous coating than the amount of the adhesive resin in the light-cured resin height in the second resinous coating and/or the second resinous coating than the adhesive resin height in the first resinous coating.

(embodiment 2)

In embodiment 2, utilize Fig. 6 A～Fig. 6 E to describe for another example of the manufacture method of multi-layered information recording medium of the present invention.

Fig. 6 A～Fig. 6 B is that expression utilizes the sectional view of signal substrate for transfering 702 to the form of resinous dope layer 105 ' transfer printing signal.Utilize the method same, go up paste signal substrate for transfering 702 (with reference to Fig. 6 A) at the resinous dope layer 105 ' that is coated on first signal substrate 601 with embodiment 1.On signal substrate for transfering 702, dispose the roller 903 of drum, roller 903 rotation is moved, by 903 pairs of signal substrate for transfering 702 of roller pressurize (with reference to Fig. 6 B).Like this, after first signal substrate 601 and signal substrate for transfering 702, if mobile pressing mechanism on signal substrate for transfering 702 (roller 903), and by pressing mechanism (roller 903) signal substrate for transfering 702 is pressurizeed, then carry out transfer printing well to the signal of resinous coating 105 '.

The situation that roller 903 has a heating arrangements is pressurizeed to signal substrate for transfering 702 as required and is heated, and also can be on signal substrate for transfering 702 mobile roller 903.Under this situation, good carrying out is to the transfer printing of the signal of resinous dope layer 105 '.Viscosity descends ultraviolet curable resin before solidifying by heating, so easily and carry out the transfer printing of fine shapes such as groove and pit well.

The pressurization of being undertaken by roller 903 is preferably at 30kgf/cm ²～100kgf/cm ²(29.4 * 10 ⁵Pa～98.1 * 10 ⁵Pa) carry out in the scope.The pressure that is applied to signal substrate for transfering 702 is big more, and transfer printing is good more, but when pressure was excessive, multi-layered information recording medium produced crooked and/or produces the thickness variation of resin bed.If pressure in above-mentioned scope, can not produce the bending of multi-layered information recording medium and the thickness variation of resin bed, carry out the transfer printing of signal well.

The surface temperature of roller 903 is preferably at 25 ℃ Celsius～100 ℃ Celsius.If temperature is too high, then produce the bending of the rotten and multi-layered information recording medium of resin bed.The surface temperature of roller 903 can not produce the bending of the rotten or multi-layered information recording medium of resin bed in above-mentioned scope, carry out the transfer printing of signal well.

In addition, can reduce by what the pressurization of roller 903 produced and be included in bubble in the resinous coating 105 '.But, preferably will form after first signal substrate 601 of first information recording portion 602 and signal substrate for transfering 702 be configured in the relief groove 701 applying first signal substrate 601 and signal substrate for transfering 702 relief groove 701 in.This be because, the bubble of sneaking into during the coating that can remove cold coating, and can reduce the bubble of sneaking into when fitting first signal substrate 601 and signal substrate for transfering 702.

Then, the ultraviolet irradiating machine 904 of the top by being arranged on signal substrate for transfering 702 through 702 pairs of resinous dope layers 105 ' irradiation irradiates lights of signal substrate for transfering, solidifies the ultraviolet curable resin that is included in the resinous dope layer 105 '.In addition, in the present embodiment, with embodiment one similarly, the material of signal substrate for transfering 702 uses the transparent in fact polyolefin resin of above-mentioned irradiates light (with reference to Fig. 6 C).

Then, the resinous dope layer 105 ' (resin bed 603) after solidify is peeled off signal substrate for transfering 702.At this moment, if pressurized air is blown between signal substrate for transfering 702 and the resin bed 603, on one side can keep the engagement state of first information recording portion 602 and resin bed 603, Yi Bian easily peel off signal substrate for transfering 702 from resin bed 603.

Then, second information recording part 604 is also similarly utilized method such as sputter form (with reference to Fig. 6 D) with first information recording portion 602.Resin bed 605 also similarly forms with resin bed 603.In addition, the three～four information recording part 606,608, resin bed 607 form similarly.Then, on the 4th information recording part, form hyaline layer 609.Hyaline layer 609 also can similarly form (with reference to Fig. 6 E) with embodiment 1.

In embodiment 1 and 2, the multi-layered information recording medium that all will possess 4 information recording parts describes for example, and multi-layered information recording medium of the present invention and manufacture method thereof are not limited to this.The number of information recording part can be got 2 or 3 by adjusting the thickness of first signal substrate, resin bed, hyaline layer etc., also can be more than 5.The information recording carrier that possesses a plurality of information recording parts can the record-playback bulky information.

In addition, in embodiment 1 and 2, first～the 4th information recording part all be reflectance coating 503, first deielectric-coating 504, recording film 505, second deielectric-coating 506 from the structure (with reference to Fig. 2) of the first signal substrate side by this arranged in order, first～the 4th information recording part is not limited to this mode.Each information recording part comprises recording film at least and gets final product, and also can not have in other film at least one, also can comprise these films film in addition.

In addition, in embodiment 1 and 2, discoid so-called Blu-ray dish is example, the situation that applies resinous coating on peripheral edge portion 601a that removes first signal substrate 601 and first signal substrate 601 the 601b of inner periphery portion has been described.But multi-layered information recording medium of the present invention and manufacture method thereof are not limited to this.For example, do not have the multi-layered information recording medium of center pit 601 for for example storage card etc., the resinous coating of coating gets final product on first signal substrate 601 except that the peripheral edge portion of first signal substrate.

As mentioned above, according to the present invention, can provide the reproduction and the good multi-layered information recording medium and the manufacture method thereof of production efficiency of carrying out recording of information or information well.

Industrial utilizability

According to multi-layered information recording medium of the present invention and manufacture method thereof, the multi-layered information recording medium that can provide the reproduction of carrying out well information or recording of information to reproduce high productivity. The present invention is not only applicable to have the discoidal Blu-ray Disc of centre bore, also is applicable to storage card, CD, DVD, holographic memory etc.

Claims

(according to the modification of the 19th of treaty)

1 (revising the back). a kind of manufacture method of multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

On the above-mentioned signal substrate except that the edge part of above-mentioned signal substrate, the hole by the hole version applies resinous coating,

With the coated above-mentioned signal substrate of above-mentioned resinous coating, under the air pressure that forces down than atmosphere, remove after the bubble that is blended in the above-mentioned resinous coating,

Across coated above-mentioned resinous coating, under the air pressure that forces down than atmosphere, fit above-mentioned signal substrate and signal substrate for transfering,

The resin solidification that is comprised in the coated above-mentioned resinous coating is formed above-mentioned resin bed, then,

Peel off above-mentioned signal substrate for transfering from above-mentioned resin bed.

2 (revising the back). a kind of manufacture method of multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

On the above-mentioned signal substrate for transfering except that the edge part of signal substrate for transfering, the hole by the hole version applies resinous coating,

With the coated above-mentioned signal substrate for transfering of above-mentioned resinous coating, under the air pressure that forces down than atmosphere, remove after the bubble that is blended in the above-mentioned resinous coating,

Across coated above-mentioned resinous coating, under the air pressure that forces down than atmosphere, fit above-mentioned signal substrate and above-mentioned signal substrate for transfering,

3 (revising the back). a kind of manufacture method of multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

On the above-mentioned signal substrate for transfering except that the edge part of signal substrate for transfering, the hole by the first hole version applies the first resinous coating,

On the above-mentioned signal substrate except that the edge part of above-mentioned signal substrate, the hole by the second hole version applies the second resinous coating,

With the coated above-mentioned signal substrate for transfering of the above-mentioned first resinous coating, under the air pressure that forces down than atmosphere, remove the bubble that is blended in the above-mentioned first resinous coating, and with the coated above-mentioned signal substrate of the above-mentioned second resinous coating, under the air pressure that forces down than atmosphere, remove after the bubble that is blended in the above-mentioned second resinous coating

Across the above-mentioned first resinous coating and the above-mentioned second resinous coating, under the air pressure that forces down than atmosphere, fit above-mentioned signal substrate and above-mentioned signal substrate for transfering,

The resin solidification that is comprised in the resin that comprised in the above-mentioned first resinous coating and the above-mentioned second resinous coating is formed above-mentioned resin bed, then,

4. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, in the formation operation of above-mentioned resin bed, applies after the above-mentioned resinous coating fit after the process schedule time above-mentioned signal substrate and above-mentioned signal substrate for transfering.

5. the manufacture method of multi-layered information recording medium as claimed in claim 1, it is characterized in that, in the formation operation of above-mentioned resin bed, after the above-mentioned resinous coating of coating, before fit above-mentioned signal substrate and the above-mentioned signal substrate for transfering, heat above-mentioned coated resinous coating.

6. the manufacture method of multi-layered information recording medium as claimed in claim 5 is characterized in that, above-mentioned coated resinous coating is heated to its surface temperature reaches 40 ℃～120 ℃.

7. the manufacture method of multi-layered information recording medium as claimed in claim 5 is characterized in that, above-mentioned coated resinous coating is heated to its surface temperature reaches 40 ℃～100 ℃.

8. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, in the formation operation of above-mentioned resin bed, in the process of the above-mentioned resinous coating of coating, uses hot blast to heat above-mentioned resinous coating.

9. the manufacture method of multi-layered information recording medium as claimed in claim 5 is characterized in that, uses hot blast to heat above-mentioned coated resinous coating.

10. the manufacture method of multi-layered information recording medium as claimed in claim 9 is characterized in that, above-mentioned coated resinous coating is heated to its surface temperature reaches 30 ℃～100 ℃.

11. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, the above-mentioned resin that is included in the above-mentioned resinous coating comprises light-cured resin.

12. the manufacture method of multi-layered information recording medium as claimed in claim 11 is characterized in that, above-mentioned light-cured resin comprises ultraviolet curable resin.

13. the manufacture method of multi-layered information recording medium as claimed in claim 12, it is characterized in that, in the formation operation of above-mentioned resin bed, after the above-mentioned resinous coating of coating, before fit above-mentioned signal substrate and the above-mentioned signal substrate for transfering, utilize electromagnetic wave to heat above-mentioned coated resinous coating than the wavelength region may of ultraviolet line length.

14. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, the viscosity of coated above-mentioned resinous coating is 30mPas～4000mPas.

15. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, the viscosity of coated above-mentioned resinous coating is 100mPas～4000mPas.

16. the manufacture method of multi-layered information recording medium as claimed in claim 1, it is characterized in that, in the formation operation of above-mentioned resin bed, after fit above-mentioned signal substrate and above-mentioned signal substrate for transfering, after by pressing mechanism above-mentioned signal substrate for transfering being pressurizeed, solidify the resin that is included in the above-mentioned resinous coating.

17. the manufacture method of multi-layered information recording medium as claimed in claim 11 is characterized in that,

Above-mentioned signal substrate for transfering is transparent to the employed irradiates light of the curing of above-mentioned resin;

Shine above-mentioned irradiates light through above-mentioned signal substrate for transfering to above-mentioned resinous coating and solidify above-mentioned resin.

18. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that, above-mentioned signal substrate for transfering comprises polyolefin resin.

19. the manufacture method of multi-layered information recording medium as claimed in claim 1 is characterized in that,

Above-mentioned signal substrate is have center pit discoid;

At the above-mentioned resinous coating of coating on the peripheral edge portion of above-mentioned signal substrate and the above-mentioned signal substrate the inner periphery portion.

20. a multi-layered information recording medium is characterized in that, makes by the manufacture method of the described multi-layered information recording medium of claim 1.

21. a multi-layered information recording medium, comprise signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that,

Will with the measuring point mutually not repeatedly mode setting measurement number be the mean value of the 120 above-mentioned resin layer thickness of measuring, when being set at the average thickness of above-mentioned resin bed, the maximal value of above-mentioned resin layer thickness and the difference of minimum value are smaller or equal to 10% of above-mentioned average thickness.

Claims

1. the manufacture method of a multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

2. the manufacture method of a multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

3. the manufacture method of a multi-layered information recording medium, this multi-layered information recording medium comprises signal substrate, be configured on the above-mentioned signal substrate more than or equal to 2 information recording part and be configured in resin bed between the neighbor information recording portion, it is characterized in that

Comprise the operation that forms above-mentioned resin bed,

In the formation operation of above-mentioned resin bed,

The resin solidification that is comprised in the resin that comprised in the first resinous coating and the second resinous coating is formed above-mentioned resin bed, then,

Above-mentioned signal substrate is have center pit discoid;