CN1822152A - Optical recording medium and manufacturing method thereof - Google Patents

Abstract

A method of manufacturing an optical recording medium is provided, which is capable of manufacturing a highly reliable optical recording medium, an eccentricity of each recording layer formed on each of a plurality of sheet-like substrates may be suppressed, and which does not involve a complicated process. Specifically, a plurality of sheet-like substrates are laminated by a laminating apparatus under the condition that a recording layer is formed on one surface of each of the plurality of sheet-like substrates, and an uncured adhesive layer is formed on the other surface thereof. The laminating apparatus performs centering of each sheet-like substrate before the process of curing the adhesive layers. Then, the adhesive layers are cured, and a punching apparatus punches the three-layered sheet-like substrates into a disk shape in a collective manner, thereafter.

Description

Optical recording media with and manufacture method

Technical field

The present invention relates to have the optical recording media of sandwich construction, wherein, a plurality of sheet-like substrates (each substrate all has recording layer) are stacked together, and relate to the method for making this optical recording media.

Background technology

Recently, be that the optical recording media of representative is being used as the medium that is used to write down various information segments in audiovisual field and computer realm with the CD.In addition, because the diversified development of the universal and information of removable computer, it is big therefore to need capacity, the optical recording media that size is little.

Information writes down or reproduces by making to use up with respect to optical recording media.Go up to form such as the hole that is used to obtain tracking servo signal or the like and the uneven pattern the pre-groove (below abbreviate " signal pattern " as) at substrate (sheet-like substrates).Formed the surface of inhomogeneous pattern in the above, that is, inhomogeneous patterned surfaces (also abbreviating " information recording surface " as) is gone up and is formed recording layer, and further forms organic protection layer or the like, so that cover recording layer.

As optical recording media, known have a structure that single chip architecture is relative with two sheet-like substrates wherein and bond together.In addition, along with demand, also proposed to have the recording medium of the sandwich construction that has wherein formed a plurality of recording layers to high density recording.Fig. 9 has shown the example of sandwich construction, forms a plurality of recording layers 92 by transparent middle layer 94 or the like.The top of recording layer 92 in the figure forms organic protection layer 93.

Can be used for recoding/reproduction and erasure information by any side incident light from substrate 97 sides or organic protection layer 93 sides.Yet known is favourable from organic protection layer 93 side recoding/reproductions and erasure information with regard to improving density, because make the light-transmitting layer attenuation easily, thereby can improve the numerical aperture (NA) of the object lens of pick-up.

The following files has illustrated the optical recording media with sandwich construction referred to above, with and manufacture method, or form the method for a plurality of recording layers.

Yet, have following point respectively according to the routine suggestion of the following files.

International open No.98/02875 illustrated have high productivity, fabulous optical characteristics, and the method for the manufacturing CD (optical recording media) of fabulous mechanical accuracy and physical strength.According to the method, will form plate-like by comprising the sheet material that polyolefin polymer makes as the material of principal ingredient, on this sheet material, form the information recording surface of making by curable resin.In addition, international open No.98/02875 proposed before making plate-like, formed the film of being made by curable resin that has formed information recording surface and recording layer in the above on sheet material, after this, again the sheet material that is produced was formed plate-like.International open No.98/02875 has also proposed to make by stacked multi-disc light curable resin with information recording surface on the sheet material that forms plate-like the method for the optical recording media with sandwich construction.

The method that forms sheet material as the described curable resin that will have information recording surface of the open No.98/02875 in the world is a known technology, because backing material is only limited by light polymerization process (2P method), this method is usually known manufacture method.

In addition, according to the open No.98/02857 in the world, do not consider corresponding substrate (each substrate all has information recording surface) alignment (between two parties).If can not the off-centre of substrate then may take place with pinpoint accuracy with being centrally located in the CD of each substrate, this may cause various inconvenience.

It is the recording medium that forms the structure of recording layer on 0.3 μ m or the littler sheet material that the open No.H11-185291 of Japanese Patent Application Publication has proposed to have wherein at thickness, and having wherein a recording medium that is forming the sandwich construction of recording layer on the support substrates of rigidity having, the intermediary by transparent intermediate layer is bonded together sheet material.

Sandwich construction by using such thin slice to form is favourable, because can be with high density recording information.Yet Japanese Patent Application Publication No.H11-185291 only considers double-decker, and wherein, the support substrates and the sheet material that will have recording layer bond together, and perhaps wherein forms the hard disk type of recording layer on two surfaces of aluminium substrate.

Japanese Patent Application Publication No.2000-36135 has proposed following process has the optical recording media of sandwich construction as manufacturing method.At first, on sheet material, form signal surface (identical), on signal surface, form translucent film with information recording surface.Then, the sheet material stamping is become reservation shape, to produce first substrate.Form substrate by injection molding or the like, and further on substrate, form reflectance coating, thereby produce second substrate with signal surface.At last, by the intermediary of clear binder, together with first and second substrate bindings.

According to the method,,, just can not go wrong therefore as long as structure is a double-decker with the substrate binding that forms predetermined contour shape together.Yet, form as the middle layer sheet material with the situation of obtaining multilayer (three layers or more multi-layered) structure under, the sheet material attenuation in middle layer (m to tens μ m of several μ).So, be difficult to handle sheet material, this can have problems aspect throughput rate.Specifically, generally be supported in its end parts by the sheet material of stamping, under the situation of thin slice, support region (end parts) is very narrow.

In addition, Japanese Patent Application Publication No.2000-36135 has also described sheet material and has been in the same place with substrate binding, after this, the main body mould of layering is washed into plate-like.Yet this is strictly limited to double-decker, does not consider multilayer (three layers or more multi-layered) structure.

Japanese Patent Application Publication No.2003-115130 has proposed sandwich construction, wherein, sheet material with the light curable resin bed in the reflection horizon that has signal surface (identical with information recording surface) and form on this signal surface is used as substrate, by bonding agent together, its manufacture method has also been proposed with three layers or more multi-layered substrate binding.

Proposed this sandwich construction, so that solve such problem: at substrate thickness is under 300 μ m or the situation littler and that produce by injection molding, can transcribe defective.Yet Japanese Patent Application Publication No.2003-115130 does not consider the stamping of sheet material.

In addition, as mentioned above,, can utilize anchor clamps (for example, machinery or utilize vacuum cup supporting) end parts of supporting sheet or invalid zone if sheet material is thick, thus supporting sheet satisfactorily.Yet under the situation of sandwich construction, thickness that need each sheet material is set to m to tens μ m of several μ, and this makes the supporting sheet difficulty that becomes.This means, for example in bonding process, stacked unsatisfactorily each thin slice.

In addition, according to the manufacture method of Japanese Patent Application Publication No.2003-115130, disclose the same of No.98/02875 with the world, use the 2P method, this method is usually known manufacture method, and only limits the material of light curable resin.This is by form the known technology that the light curable resin bed is produced optical recording media on sheet material.

Japanese Patent Application Publication No.2002-288894 has proposed a kind of method, in the method, at least two printing opacity sheet materials is bonded on the substrate of plate-like, forms reflection horizon or the like on signal surface, and these sheet material stampings are discoid.This manufacture method is characterised in that: after bonding to sheet material on the substrate, carry out film for sheet material and form, to form signal surface.Making under the situation of sandwich construction by this manufacture method, needing repetition (1) to arrive (4) step: (1) adhesive sheet; (2) on sheet material, form signal surface; (3) the sheet material stamping is discoid; And (4) form recording layer on signal surface on a substrate.Therefore, production run is complicated, and this is disadvantageous for boosting productivity.Specifically, the manufacture method described in the Japanese Patent Application Publication No.2002-288894 has emphasized to have the production of double-deck optical recording media, and is not suitable for making three layers or more multi-layered sandwich construction.

Summary of the invention

The present invention makes considering under the situation of problem referred to above.The purpose of this invention is to provide the method for making optical recording media, this method can be made optical recording media highly reliably, can eliminate the off-centre of each recording layer that forms on a plurality of sheet-like substrates respectively, and this method does not relate to complicated process.In addition, another object of the present invention provides optical recording media highly reliably, wherein, can eliminate the off-centre of each recording layer that forms respectively on a plurality of sheet-like substrates.

The invention provides a kind of method of making optical recording media, this method can be made optical recording media highly reliably, can eliminate the off-centre of each recording layer that forms on a plurality of sheet-like substrates respectively, and this method does not relate to complicated process.

Specifically, the method according to manufacturing recording medium of the present invention comprises the following steps:

On the surface of sheet-like substrates, form recording layer with inhomogeneous pattern;

The stacked a plurality of sheet-like substrates that formed recording layer thereon of mode with alignment; And

In a concentrated manner a plurality of stacked sheet-like substrates are processed into predetermined contour shape.

Description of drawings

Fig. 1 is the sectional view of the example of the summary structure that shown the optical recording media of producing by manufacture method of the present invention.

Fig. 2 is the skeleton view that summary has shown the optical recording media of Fig. 1.

Fig. 3 is the view that summary has shown former of forming signal pattern or the like.

Fig. 4 A, 4B and 4C are the views that summary has shown the structure of the equipment that forms adhesive linkage on sheet-like substrates.

Fig. 5 is the view that summary has shown laminated apparatus of being used for stacked a plurality of sheet-like substrates or the like.

Fig. 6 is the planimetric map that has shown the alignment mark on the sheet-like substrates.

Fig. 7 A, 7B, 7C, 7D and 7E are the views that has shown production run according to this embodiment of the invention.

Fig. 8 A, 8B, 8C, 8D, 8E and 8F are the figure that has shown the production run of pressing mold.

Fig. 9 is the sectional view of example that has shown the structure of conventional optical recording media.

Figure 10 A and 10B wherein use sheet material to form the concise and to the point sectional view of the optical recording media of protective seam.

Figure 11 A, 11B, 11C and 11D have shown to use sheet material to form the schematic representation of the process of protective seam.

Figure 12 A, 12B, 12C, 12D and 12E are by CD being immersed in the schematic representation of the process that forms protective seam in the resin.

Embodiment

By embodiment the present invention is described below with reference to the accompanying drawings.

Fig. 1 is the sectional view that summary has shown the demonstrative structure of the optical recording media of producing by manufacture method of the present invention.Fig. 2 is the skeleton view that summary has shown the optical recording media of Fig. 1.As illustrated in fig. 1 and 2, comprise printing opacity support substrates 17 as the optical recording media 50 of CD, this support substrates 17 for example comprises: polycarbonate is as substrate, stacks gradually three layers of information record substrate 15A, 15B and 15C on support substrates 17.On the surface of uppermost information record substrate 15C, form protective seam 58.

Each information record substrate 15A has recording layer 16 to 15C, also forms individual layer recording layer 16 on the surface of support substrates 17.So, the optical recording media 50 of this embodiment has a structure (four-layer structure) that four recording layers 16 are arranged.Then,, and read variation in the reflected light, can carry out the information regeneration of each layer by each recording layer 16 of laser radiation of use-case Tathagata self-insurance sheath 58 sides.

The fundamental purpose of the manufacture method described in this embodiment is to eliminate the off-centre of each information record substrate 15A to the recording layer 16 of 15C, and so, the recording layer 16 on the support substrates 17 may not exist.

Corresponding information record substrate 15A, 15B and 15C are made of sheet- like substrates 10A, 10B and 10C (below, these will be collectively referred to as " sheet-like substrates 10 "), form recording layer 16 from the teeth outwards.The structure of information record substrate 15A, 15B and 15C is substantially the same, therefore, below display message is write down substrate 15A.

In information record substrate 15A, sheet-like substrates 10A for example can be the POLYCARBONATE SHEET material that thickness is approximately 15um.In its surface, form inhomogeneous signal pattern 14 (referring to the enlarged drawing in the circle).On the surface of signal pattern 14, form the recording layer 16 that for example forms by sputter.Recording layer 16 for example is the film that thickness is approximately 10nm.Therefore, recording layer 16 also has the inhomogeneous shape corresponding to the unevenness of signal pattern 14.In addition, also with same mode in the recording layer 16 of recorded information substrate 15A, the configuration support substrates 17 lip-deep recording layer 16.

CD roughly is divided into and only reproduces type, only record one-time write type once and rewritable type that can rewrite information.According to the type difference, the title that is used for the layer of recorded information can be different.For example, in one-time write type and rewritable type, the layer that is used to write down is called " recording layer ".By contrast, under the situation of only reproducing type, information is made of the hole that forms, and forms the reflection horizon on the hole.Though this reflection horizon can not executive logging,, with regard to explanation, " recording layer " in this instructions also comprises such " reflection horizon ".

Between support substrates 17 and information record substrate 15A and between corresponding information record substrate, form adhesive linkage 42, thereby each substrate is bonded to each other together.As bonding agent, for example preferred resinoid, 2 liquid adhesives, hotmelt or pressure-sensitive adhesion.As protective seam 58, can use the UV curable resin.

Next, will to 4C and 5 some equipment that is used to make optical recording media 50 referred to above be described with reference to figure 3,4A.

Fig. 3 shows the former 20 that is used for forming signal pattern on sheet-like substrates 10, is used for forming on signal pattern the film former 30 of recording layer, roller 24 (this is the device that is used to transmit sheet-like substrates 10), or the like.

Former 20 comprises the pressing mold 23 that is used for forming on a surface of the lengthy motion picture shape substrate 10 of pulling out from cylinder 19 predetermined inhomogeneous pattern, is used to sandwich the pair of supporting members 21a and the 21b of sheet-like substrates 10.Pressing mold 23 is the precision dies that engage into it a supporting member 21a, and this mould is disposed like this, so that by the heating of heating arrangement (not shown).In the former 20 of so configuration, just under heated condition, supporting member is driven 21a and 21b, to sandwich sheet-like substrates 10 at pressing mold 23.Sheet-like substrates 10 is pressed and heats, thereby inhomogeneous pattern (signal pattern) is transcribed the surface of sheet-like substrates 10.

If necessary, former 20 can have the device that is used to cool off the sheet-like substrates 10 of having transcribed inhomogeneous pattern thereon.In addition, the molding condition such as heating-up temperature, pressure, cool time and displacement to the pressing mold in the transcription 23 is not particularly limited, top condition be can suitably select, the shape of signal pattern, the quality of materials of sheet-like substrates 10 considered, thickness of sheet material or the like.

Former 30 is the sputtering equipments that are used for forming recording layer 16 on the surface of the signal pattern of the sheet material substrate 10 that transmits.Former 30 is not limited only to be used to carry out the equipment of sputter, and can be other various formers.After a while its details will be described.

Fig. 4 A has shown the demonstration equipment that is used for forming adhesive linkage 42 on sheet-like substrates 10 to 4C, has shown bonding agent coating equipment 40A, 40B and 40C with different structure in Fig. 4 A, 4B and 4C respectively.

Bonding agent coating equipment 40A has roller 45a, 45b and 45c, is used to transmit the sheet-like substrates 10 that has formed recording layer 16 thereon.In them, a roller 45b is placed in the case 41 that has been full of uncured bonding agent 48.Therefore, bonding agent 48 is attached to two surfaces passing through the sheet-like substrates 10 of roller 45b.By blade 43 respect to one another (sheet-like substrates 10 is placed between them) bonding agent 48 of adhesion is adjusted to predetermined thickness.In this embodiment, the bonding agent of recording layer 16 sides is removed fully, and the adhesive linkage 42 with predetermined thickness (for example, about several μ m) is allowed to be retained in the upper surface side (referring to the enlarged drawing in the circle) of the sheet-like substrates 10 of this figure.Blade 43 can comprise scraper or the like.

Can use equipment shown in Fig. 4 B and 4C to replace bonding agent coating equipment 40A among Fig. 4 A.In the bonding agent coating equipment 40B shown in Fig. 4 B, pair of rolls 45a and 45b toward each other, sheet-like substrates 10 is placed between them.At the upstream side of roller 45a and 45b, placed a nozzle 47, be used for bonding agent 48 is provided to the upper surface of sheet-like substrates 10.The lower face side of sheet-like substrates 10 be with said structure in the same recording layer 16.Bonding agent 48 by the time, with bonding agent 48 on the upper surface of roller 45a and 45b wafer-like substrate, that provide from nozzle 47, so that become adhesive linkage 42 with predetermined thickness.By making bonding agent coating equipment 40B distortion referred to above, obtain bonding agent coating equipment 40C, it has such structure: nozzle 47 is placed on the top of roller 45a and 45b, will directly be provided to roller 45a from the bonding agent 48 of nozzle 47.

Fig. 5 has shown laminated apparatus 70, it is used for by three lamination shape substrates 10 layer by layer, wherein, and when sheet-like substrates 10 during by various device 20,30,40 referred to above or the like, form recording layer and adhesive linkage, stamping equipment 60 is used for three-layer tablet shape substrate 10A discoid to the 10C stamping.Laminated apparatus 70 comprises a plurality of jockey pulleys 76, is used for transmitting respectively sheet-like substrates 10A to 10C, and the control device (not shown), is used to control the driver of jockey pulley 76.Each jockey pulley 76 is disposed like this, so that in forward and reverse rotation, and the sheet-like substrates that is used to align (describing after a while), and can transmit sheet-like substrates at both direction.Laminated apparatus 70 also comprises two guide pieces 71, is used under the condition that they contact with each other stacked three-layer tablet shape substrate 10A to 10C.

In Fig. 5, though only summary has shown each guide piece 71,, guide piece 71 can comprise roller component respect to one another, and three-layer tablet shape substrate is placed between them, and for example carries out contacting with corresponding sheet-like substrates 10A up and down and 10C.Guide piece 71 can also have and is used to prevent that air from resting on the mechanism between the sheet-like substrates.In addition, guide piece 71 can also have the Width that is used for respect to sheet-like substrates,, perpendicular to the direction of the direction of transfer on sheet material plane, locatees the mechanism of corresponding sheet-like substrates 10A to 10C that is.

For the position of each sheet-like substrates of aliging, on each sheet-like substrates 10, provide alignment mark 13 as shown in Figure 6.Specifically, the outside in the zone for the treatment of stamping, or the outside of the information recording area of CD provide at least three alignment marks 13, for example, and at the circumferencial direction of CD, uniformly-spaced to place three alignment marks 13.

The shape that depends on alignment mark, an alignment mark also is fine, and in the case, can provide an alignment mark at the center of substrate, can adjust the position of each sheet material, so that mate with alignment mark.In addition, under the condition that is aligned before stacked, also can stacked each sheet material, this does not have under the situation of mobile bonding agent in use be effective.

Can use former 20 for example referred to above to form alignment mark 13 (referring to Fig. 3).Specifically, be provided for forming the outstanding of alignment mark in the outside of the effective coverage of pressing mold 23.Then, in the process of transcribing that pressing mold 23 is carried out, can on sheet-like substrates 10, form alignment mark 13 with signal pattern 14.

Shape for alignment mark 13 is not particularly limited, as long as can detect them with high precision.Not only can use cruciform as shown in the figure, and can use cruciform slit, star or the like.

Please referring to Fig. 5, two sensors 74 that are used to detect alignment mark 13 referred to above are placed in a zone between two guide pieces 71, as the composition member of laminated apparatus 70 once more.Be sent to the control device (not shown) of laminated apparatus 70 by the positional information of sensor 74 detected alignment marks 13.Control device drives jockey pulley 76 or the like so that corresponding sheet-like substrates 10A is positioned the center to 10C.The corresponding sheet-like substrates 10A that guide piece 71 supportings are so alignd is to 10C, and this has kept aligned condition.

Stamping equipment 60 is the press that are used for stamping, be placed in two zones between the guide piece 71, and in a concentrated manner the folded layer by layer sheet-like substrates 10A of stamping three to 10C.

Specifically, stamping equipment 60 comprises a pair of punching press member 61a and 61b, is used to sandwich sheet-like substrates and they are carried out stamping.The member that is stamped is plate-like (that is a circle) to the contour shape of the sheet material of 61a and 61b stamping.So, produce lamination 50 ', wherein, stacked three-layer tablet shape substrate 10A is to 10C.

Next, will to 7E the method for the manufacturing optical recording media 50 of this embodiment and the operation of each equipment referred to above be described with reference to figure 7A.Fig. 7 A has shown sheet-like substrates 10 and the recording layer 16 that does not have inhomogeneous pattern to the 7E summary.

At first, the sheet-like substrates 10 of pulling out from cylinder 19 (referring to Fig. 3) is sent to former 20 by roller 24.Under the condition that the driving of roller 24 is stopped, former 20 is driven.When shaping equipment 20 was driven, pressing mold 23 was forced on the surface of sheet-like substrates 10, thereby formed predetermined signal pattern 14 (referring to Fig. 7 A) on sheet-like substrates 10.

Then, driven roller 24 once more, to transmit sheet-like substrates 10.Carry out this transfer operation, be placed on predetermined position in the film former 30 up to formed signal pattern 14.Then, by drive membrane former 30, on the surface of signal pattern 14, form recording layer 16 (referring to Fig. 7 B).

Then, for example,, on sheet-like substrates 10, form adhesive linkage 42 (referring to Fig. 7 C) with predetermined thickness by allowing sheet-like substrates 10 by the bonding agent coating equipment 40A among Fig. 4 A.On the surface of the sheet-like substrates 10 relative, form adhesive linkage 42 with recording layer 16.

Then, the sheet-like substrates 10A that will form recording layer 16 and adhesive linkage 42 thereon by jockey pulley 76 is sent to the guide piece 71 (referring to Fig. 5) of laminated apparatus 70 to 10C.Here, by the adhesive linkage shown in Fig. 7 D 42, the three-layer tablet shape substrate 10A by 71 supportings of two guide pieces is contacted with each other to 10C.At this moment, bonding agent does not also solidify.So, can make each sheet-like substrates placed in the middle.

Specifically, in the contact condition shown in Fig. 7 D, the sensor 74 of laminated apparatus 70 is provided by the position of the alignment mark 13 that provides on each sheet-like substrates.Based on testing result,, carry out the final location (between two parties) of corresponding sheet-like substrates 10A to 10C by jockey pulley 76 or guide piece 71.Since this position, the center in the zone for the treatment of stamping in the corresponding sheet-like substrates of having alignd.

After finished final location, adhesive linkage 42 was cured.According to the type of bonding agent to be used, determine the process of curing adhesive.For example, under the situation of using thermosets, heating is corresponding to this process.

Then, after adhesive linkage 42 is cured,, in a concentrated manner three folded layer by layer sheet-like substrates are carried out stamping by driving stamping equipment 60.So, produce lamination 50 ', wherein stacked three-layer tablet shape substrate 10A is to 10C (referring to Fig. 7 D).

Then, shown in Fig. 7 E, by adhesive linkage 42, will have signal pattern 14, and before form recording layer 16 thereon, and by the discoid support substrates 17 of stamping and lamination 50 ' bond together, to obtain stacked recording medium 55.

Then, on the sheet-like substrates 10C on the uppermost face side, form protective seam 58, thereby produce the optical recording media 50 of this embodiment.

In said process, the forming process that adopts the mode of concentrating has been described.Below, will be than describing the process that forms protective seam 58 in order to obtain higher-quality recording medium in greater detail.Below, the formation of relevant protective seam 58 will be described the method for using sheet material 100 and the method for using liquid resin 121.

Figure 11 A is to have shown the view that uses the sheet material 100 that is formed from a resin to form the process of protective seam to 11D.Below, will describe the process of using sheet material 100 to form protective seam in detail to 11D with reference to figure 11A.

(1) on support tool 111, places stacked recording medium 55.Method for the stacked recording medium 55 of supporting is not particularly limited, can consider with driving mechanism supporting inner circumferential side method, use the method or the like (Figure 11 A) that is connected to ball or the like the several points of supporting of spring by a contact.

(2) screening glass 100 is placed on stacked recording medium 55 tops that are supported, is careful simultaneously, air and foreign matter can not be arranged.For screening glass and stacked recording medium being contacted with each other and not relating to air and foreign matter, ideally, should carry out this process in a vacuum.As the material of substrate side screening glass 100, can consider the various materials such as thermoset resin and pyrocondensation resin.In addition, be not particularly limited, can use various materials, as long as material has adhesive linkage for material.Can in screening glass 100, set in advance center pit, also can not be provided with.Screening glass 100 is had no particular limits, and can be monolithic, also can consider throughput rate and is wound in drum-shape (Figure 11 B).

(3) screening glass 100 and stacked recording medium 55 are bonded together under the condition that they contact with each other.Material according to employed screening glass is selected joint method.In addition, wish that also in the inner circumferential side of recording medium, the protective seam of joint covers whole recording layer, and does not protect the part of support substrates.So, in the process of reproducing signal, use the shielded part that do not have of support substrates to carry out clamping.As a result, can not weaken eccentric precision (Figure 11 C).

(4) if necessary, handle into the optical recording media shape with interior with the neighboring, thereby finish optical recording media with sandwich construction.In screening glass, do not provide under the situation of center pit, require this process.The method that shape is handled is not particularly limited, and is known (Figure 11 D) such as the method with press stamping and laser treatment.

Figure 10 A is to use the concise and to the point sectional view of four layers of optical recording media of the sheet production in the process that forms protective seam.In four layers of optical recording media 112 of the sheet production in using the process that forms protective seam; formed thereon on the signal pattern of sheet- like substrates 10A, 10B, 10C of signal pattern, and formed thereon on the signal pattern of support substrates 17 of signal pattern and form recording layer 16.By adhesive linkage 42 stacked sheet material referred to above and support substrates, protect this stacked by screening glass 10.

Figure 12 A is to have shown by CD being immersed in the view of the process that forms protective seam in the resin to 12E.Below, will describe in detail by applying the process that resin forms protective seam.

(1) on support tool 122, places stacked recording medium 55.The same with described in first embodiment of the present invention, the method that supports stacked recording medium 55 is not particularly limited, can consider with driving mechanism supporting inner circumferential side method, use the first method that is connected to ball or the like the several points of supporting of spring by a contact, or the like.

(2) when the stacked recording medium 55 that is supported rotated with constant rotation number, the stacked recording medium 55 that is supported was allowed to the case 123 by being full of the resin that is used for protective seam 120.At this moment, wish that resin does not contact with the inner periphery sidewall.So, can prevent generation, thereby eccentric precision can be not weakened by the caused burr of effect of the resin that is used for the protective seam on the inner circumferential side.The resin that is used for protective seam 120 is not particularly limited, and its example comprises UV curable resin or the like.With regard to regard to the role of protective seam, the resin that need after solidifying, have sufficient hardness.

(3) after immersing, control is used for the thickness of the resin of protective seam 120.Method to control thickness is not particularly limited, and according to the viscosity control medium rotation number of the resin that is used for protective seam and adjust the method for the thickness of protective seam, and is known with the method that low velocity pulls up the medium of immersion.

(4) by solidifying the resin that is used for protective seam according to the method (as irradiation and the heating of UV) of material of the resin that is used for protective seam.

(5) remove optical recording media from support tool 122, thereby finish optical recording media 121.Figure 10 B is by CD being immersed in the concise and to the point sectional view of four layers of optical recording media producing in the resin in the process that forms protective seam.By in forming the process of protective seam, applying in four layers of optical recording media 121 of production of resins, formed on the signal pattern of sheet- like substrates 10A, 10B, 10C of signal pattern thereon and formed thereon on the signal pattern of support substrates 17 of signal pattern and formed recording layer 16.By adhesive linkage 42 stacked sheet material referred to above and support substrates, protect this stacked by the resin that is used for protective seam 120.

As mentioned above, according to the manufacture method of this embodiment, 70 that be in alignment with each other by laminated apparatus, with the fixing three-layer tablet shape substrate 10A of alignment thereof to 10C, discoid by stamping in a concentrated manner by stamping equipment 60.Therefore, corresponding sheet-like substrates 10A is to the displacement of 10C, and in other words, the displacement of the recording layer 16 of each sheet-like substrates is minimized, and therefore, has obtained to eliminate the reliable optical recording media 50 of height of eccentric phenomena.

In addition, according to the manufacture method of this embodiment, stacked concurrently three-layer tablet shape substrate 10A promptly, is not stacked one by one corresponding sheet-like substrates to 10C.Therefore, simplified production run.

Sheet material stamping one-tenth dish is not necessarily carried out after curing adhesive.For example, according to shape of stamping die or the like, by after curing adhesive, sheet material being carried out stamping, can easier acquisition has the adhesive linkage 42 of uniform thickness.

In addition, in the side of a plurality of stacked sheet material substrates, use the sheet material of making by resin or liquid resin as protective seam.This side that can prevent the sheet material substrate can obtain to have the multi-layered optical recording medium of the permanance of higher quality and Geng Gao because corrosion and deterioration.

(example 1)

Below, will with reference to figure 1,2,3,4A to 4C, 5,6 and 7A to 7E specific example of the present invention is described.

As the sheet-like substrates 10A that makes by polycarbonate, 10B and 10C, prepared and be respectively the substrate that thickness is 12 μ m, 13 μ m and 14 μ m.As support member, stacked thickness is the screening glass of 100 μ m on a surface of each sheet-like substrates.

The glass transition point of polycarbonate resin is 140 ℃, and its heat distortion temperature is approximately 120 ℃.In addition, it is 30 ℃ to 40 ℃ transcribe tight back sheet substrate temperature by the pressing mold 23 of former 20.

In film former 30, form SiN film (reflection horizon) by sputter as recording layer 16, its thickness is 10nm.In sputter procedure, use mask, so that do not form alignment mark 13.

By adjusting pressure, glass flow speed and the power supply in the film forming process, can change the penetrability of the relevant corresponding recording layer 16 in the sheet-like substrates and do not change thickness.In this example, the transmittance of four layers of recording layer 16 is configured to increase from support substrates 17 sides to the outermost surface side under last optical recording media 50 states.

As bonding agent 48, use thermosetting adhesive, use the bonding agent coating equipment 40B shown in Fig. 4 B to form adhesive linkage 42.The thickness of each adhesive linkage 42 is approximately 3 μ m.After applying bonding agent, peel off the screening glass of sheet-like substrates.

Interfloor distance between each recording layer 16 is that the summation by the thickness of adhesive linkage 42 and sheet-like substrates 10 and thickness defines.In this example, use sheet-like substrates 10 to adjust interfloor distance.Specifically, as mentioned above, the thickness of adhesive linkage is set to very little (that is, about 3 μ m), and on the other hand, the thickness of sheet-like substrates is set to tens μ m.Compare with the thickness of sheet-like substrates, the thickness of adhesive linkage may fluctuate.Therefore, it is favourable making adhesive linkage thinner by this way, because can improve the homogeneity of last interfloor distance.Only, just can adjust interfloor distance like a cork by changing the thickness of each sheet-like substrates.

Treat to be set to external diameter 120 mm, internal diameter 12mm by the contour shape of the CD of stamping equipment 60 stampings.In addition, in stamping equipment 60, the support substrates 17 (thickness of making by polycarbonate: 1.1mm) be placed under the three-layer tablet shape substrate of anticipating into shape referred to above.

In support substrates 17, form signal pattern 14 and recording layer 16 with independent step.In addition, keep vacuum state, can prevent that air or foreign matter are retained between the corresponding sheet-like substrates by the inside that makes stamping equipment 60.

Then, by laminated apparatus 70 stacked three-layer tablet shape substrates,, in a concentrated manner three-layer tablet shape substrate 10A is carried out stamping to 10C by stamping equipment 60.After this, support substrates 17 is joined to the lower surface of sheet-like substrates 10C.In this example, the step of solidifying adhesive linkage 16 (adhesive linkage that is used for additional three-layer tablet shape substrate) was carried out before the stamping step.

Because above-mentioned steps, obtained three-layer tablet shape substrate 10A wherein stacked to the 10C and the structure at an end 17.After this, on the upper surface of the sheet-like substrates 10C on the uppermost face side (strictly, on the upper surface of its recording layer 16), the thickness of the protective seam 58 that will be made by the UV curable resin forms 75 μ m.Therefore, obtained optical recording media according to this example.After a while description is provided the process of protective seam 58.

When reproducing the information of each recording layer 16 record from protective seam 58 sides of the optical recording media of production like this, in each layer, can carry out reproduction, and not have any problem.

This embodiment and this example has been described.Yet the present invention is not limited only to above-mentioned explanation, can carry out various modifications.

For example, the material of sheet-like substrates 10 is not particularly limited, as long as it is writing down, can not produce any problem when reproduction or erasure information with optical mode with respect to recording layer 16.For example, can be without polycarbonate, and use polyolefin resin or acryl resin as thermoplastic resin.Recently, employed light wavelength shortens (that is, being 785nm in CD, is 660nm in DVD), in addition, has worked out 405nm in Blu-light CD.Given this, under the preferable case, should use, very may not cause birefringent material at less absorption of these wavelength coverages or reflected light.In addition, though can at random select the thickness of sheet-like substrates 10 at about 1um in the scope of 300um,, under the preferable case, tackle this and suitably select, and the quantity of consideration recording layer 16 and the dynamic range of spherical aberration correcting mechanism.

In addition, also can adjust interfloor distance as the middle layer by using the flat sheet-like substrates that does not form signal pattern 14 or the like thereon.Perhaps, also can use this flat sheet-like substrates as support substrates 17 or protective finish 58.So, using under the situation of sheet-like substrates as protective seam 58, stacked guard layer 58 and three-layer tablet shape substrate 10A be to 10C, and with this understanding, come in a concentrated manner these layers to be carried out stamping by driving stamping equipment 60.

In the above-described embodiments, twine sheet-like substrates 10 around cylinder 19.With regard to boosting productivity, preferably wherein from cylinder 19, pull out the structure of sheet material.Yet the present invention is not limited only to this.For example, the sheet material that cuts into predetermined size can be provided to former 20 or the like successively.The shape of each sheet material for example can be rectangle or circle.In addition, to whether having center pit also to have no particular limits.Shape to sheet material also is not particularly limited, as long as can not produce any problem when location and transmission.

In Fig. 2, though show with two rollers 24 as conveyer,, also can use belt conveyer or industrial transfer robot as conveyer to replace roller 24.

Also can adopt the method for following formation signal pattern 14 to replace said method.

Specifically, replace directly on sheet-like substrates 10, forming signal pattern, also can be on sheet-like substrates 10 stacked by in UV curable resin, thermoset resin or the dry type photopolymer any that make, formed the film of signal pattern thereon.In addition, also can with uncured (liquid) or semi-solid preparation (sheet) resin be placed on the pressing mold, solidify, and can join sheet-like substrates to.In the case, can use UV curable resin, thermoset resin or dry type photopolymer as resin referred to above.As the material that is used for UV curable resin, thermoset resin or dry type photopolymer, can use acrylic acid, epoxy resin, urethane, carbolic acid or other various modification materials.Yet, under the preferable case, should be chosen in the material of less extinction in the above-mentioned wavelength coverage, specifically, the absorption region of the startup of its photopolymerization is different from the material that is used to the wavelength coverage that writes down, reproduce or wipe.In addition, under the preferable case, the sheet with strippable protectiveness in step after a while is placed in the surface of resin.When placing the sheet of protectiveness, pressing mold passes through the sheet pressurizing resin of protectiveness, thereby can make the thickness of the sheet material that will form become even.In addition, when placing the sheet of protectiveness, the rigidity of sheet material improves significantly, thereby can improve passing on and handling of sheet material.

Can differently use the method for the sheet that uses such protectiveness.For example, following situation is possible: in predetermined step, the sheet of protectiveness joins sheet-like substrates 10 to temporarily, handles thereby improve in this step.This can improve the bearing accuracy of sheet-like substrates 10.When peeling off the sheet of protectiveness, can produce static, may have dust and be attached on it.Therefore, under the preferable case, should use anlistatig protectiveness sheet or under antistatic environment, carry out strip operation.

The method that forms recording layer 16 is not particularly limited, can uses gas deposition, CVD, dip coating, spin coating or the like to replace sputter.

As the material of optical recording layer, alloy of being made by at least a material such as Te, In, Ga, Sb, Se, Pb, Ag, Au, As, Co, Ni, Mo, W, Pd, Ti, Bi, Zn and Si or the like is known.As known technology, there have been many materials.

Except above-mentioned material, as magneto-optic recording material, there have been a large amount of these materials in alloy that a large amount of uses are made by at least a material such as Tb, Fe, Co, Cr, Gd, Dy, Nd, Sm, Ce, Ho or the like, and rare-earth transition metal alloy as known technology.

As the material in the reflection horizon that is exclusively used in reproduction, use Al, Al alloy, Si, SiN, Ag, Ag alloy or the like, and had many materials as known technology.In addition, also can use organic coloring material such as cyanine, phthalocyanine and azo-type as recording layer.

Though the thickness in recording layer referred to above or reflection horizon can at random be set,, from the light incident surface side, cause the decay of light in each recording layer and reflection horizon.Therefore, wish with the more close layer of incidence surface side in the light wavelength place that uses improve transmittance, under the preferable case, adjust the composition and the thickness in each recording layer and reflection horizon, thereby the record of each layer reproduces and deletion can be not destroyed.Composition by optimizing each sheet-like substrates and each support substrates, thickness, film formation condition or the like can form recording layer and reflection horizon with any transmittance and reflectivity.

In 4C, describe the method that bonding agent is applied to sheet-like substrates 10 at Fig. 4 A, in other words, formed the method for adhesive linkage 42.Yet the replacement use, also can append to sheet-like substrates 10 and form adhesive linkage 42 to the equipment shown in the 4C as Fig. 4 A by the flat member that will be used as adhesive linkage 42.In addition, can use the sheet-like substrates of (in a relative side of recording layer 16) formation adhesive linkage on a surface in advance.In addition, can also be at the two-sided formation adhesive linkage of sheet-like substrates 10.

In the above-described embodiments, though before the stamping step, be pre-formed adhesive linkage 42,, also can after stamping, form adhesive linkage 42.

Specifically, stacked corresponding sheet-like substrates 10A is to 10C and support substrates 17 and adhesive linkage 42 is not inserted between them the row alignment of going forward side by side.With this understanding, sheet-like substrates 10A is carried out stamping to 10C.As a result, sheet-like substrates 10A becomes plate-like to 10C, and each sheet-like substrates and support substrates all have center pit.

Then, clamp center pit, the corresponding sheet-like substrates of condition lower support and the support substrates that are aligned to 10C at sheet-like substrates 10A.After this, allow bonding agent partly to be penetrated between corresponding sheet-like substrates or the like from the CD excircle, and at curing adhesive under the condition of two face side wafer-like substrates.Therefore, between each sheet-like substrates, form adhesive linkage 42.

In order to realize permeating the step referred to above of bonding agent, need to keep the gap, so that under the condition of clamping, allow bonding agent to be penetrated between sheet-like substrates or the like.

According to method as described above, the size in gap does not change under the state of clamping, so that form adhesive linkage 42, wherein interfloor distance keeps constant.Because this, the thickness of adhesive linkage 42 unlikely changes, and therefore, the homogeneity of interfloor distance can be improved.

The method that CD is carried out stamping can be to use the method for laser treatment and machine cut, also can be to use the method (the stamping equipment 60 of Fig. 5) of stamping die.The contour shape of optical recording media is not limited only to plate-like (circle), also can be the polygonal shape such as rectangle.

In addition, the time that drives stamping equipment 60 also can change, and hereinbefore, has described after solidifying adhesive linkage 42 and has carried out stamping.Yet adhesive linkage 42 can solidify after sheet-like substrates is carried out stamping.

Laminated apparatus 70 can be in vacuum environment stacked corresponding sheet-like substrates, during with the stacked corresponding sheet-like substrates of box lunch, prevent that air or foreign matter are mixed in the sheet material.In addition, laminated apparatus can comprise the punching press member of pair of plate-shaped, is used for depressing and support three folded layer by layer sheet-like substrates from two face side.Because this in lamination area, with defeating down uniformly sheet-like substrates basically, therefore, can improve the homogeneity of the thickness of adhesive linkage.Also can carry out stamping at the state of depressing.

In addition, can adopt the whole bag of tricks that lamination 50 ' (referring to Fig. 5) and support substrates 17 are joined together.For example, stacked by stacked three-layer tablet shape substrate and support substrates 17 before the stamping, and with this understanding, can be in a concentrated manner that their stampings is discoid.

Can carry out film in alignment mark 13 forms.This is because depend on the system that reads alignment mark, improves reflectivity owing to film forms, and reads precision with raising.With regard to improving positional precision, be preferably in the outside or zone that in the stamping process, will be cut, the effective coverage of dish a plurality of alignment marks 13 are provided.Can only use an alignment mark 13.In the case, for example the core at dish provides an alignment mark, and each sheet-like substrates of can aliging is so that mate with alignment mark.

In addition, in the above-described embodiments, stacked corresponding sheet-like substrates has been described, and after this with they alignment.Yet, also can before stacked corresponding sheet-like substrates, promptly, before corresponding sheet-like substrates contacts with each other, carry out placed in the middle.In the case, guide piece 71 can be configured to make and corresponding sheet-like substrates carried out corresponding sheet-like substrates placed in the middle is contacted with each other.Do not have flowability or bonding agent to have under the situation of lazy flow at bonding agent, so placed in the middle and laminating method is favourable.

Though can produce pressing mold 23 by common known method,, contrast Fig. 8 A describes manufacturing pressing mold 13 to 8F example procedure is with as a reference.

At first, shown in Fig. 8 A, apply photoresist 81 to mother matrix glass 82 by spin coating.Then, shown in Fig. 8 B,, thereby form signal pattern with reservation shape as exposed portion 84 with laser 83 irradiation photoresists 81.

Then, shown in Fig. 8 C, exposed portion 84 is carried out alkaline development, be retained on the mother matrix glass 82 to allow predetermined signal pattern.Then, shown in Fig. 8 D, on signal pattern surface or the like, form nickel conducting film 85.For example carrying out this film by sputter forms.Then, shown in Fig. 8 E, by carrying out the nickel electroforming, forming thickness on mother matrix glass 82 is the electroformed layer 86 of 0.3mm.Then, with whole reverse side (upper surface of the figure) polishing of electroformed layer 86, after this, shown in Fig. 8 F, peel off electroformed layer 86 from mother matrix glass 82.Therefore, produced the pressing mold 23 of having transcribed predetermined signal pattern thereon.

(example 2)

Next, with describe in detail lamination 50 therein ' and the stacked recording medium 55 that is bonded together of support substrates 17 on the step of protective seam 58 is provided.

Figure 11 A has shown the process that forms protective seam under situation about using according to the sheet material 100 of the formation protective seam in the method for manufacturing optical recording media of the present invention to the 11D summary.

At first, the stacked recording medium 55 of supporting in support tool 111.Screening glass 100 is placed in the vacuum on the recording layer side of the stacked recording medium 55 that is supported, so that between stacked recording medium 55 and screening glass 100, do not have air and foreign matter.Because screening glass is made by thermoplastic resin, therefore, used thickness is the sheet material of 75 μ m.Provide center pit in employed screening glass, its inner/outer diameter has covered the recording layer in the excircle part of optical recording media fully.In inner circumferential portion, for preventing internal diameter that screening glass extends support substrates 17 to become burr, external diameter and internal diameter are set to 121.0mm and 14.0mm respectively.

Under stacked recording medium 55 and condition that screening glass 100 contacts, they are integrally heated, thus splice protection sheet 100 and stacked recording medium 55.Heating-up temperature between joint aging time is 110 ℃.

After engaging, peel off stacked recording medium 55 from support tool 111, thereby finish according to four layers of optical recording media 112 of first embodiment production.

Figure 10 A and 10B are the concise and to the point sectional views according to four layers of optical recording media 112 of this example production.In four layers of optical recording media 112 producing according to this example,, and carry out stamping by the adhesive linkage 42 stacked sheet-like substrates that form signal pattern thereon (10A, 10B and 10C).Then, formed thereon on the signal pattern of support substrates 17 of signal pattern and formed recording layer 16.Then, by adhesive linkage 42 stacked stacked sheet material referred to above on support substrates 17, thereby, finish four layers of optical recording media 112 thus by screening glass 100 protective seam laminations.

By using sheet material to form protective seam according to this example, can be with High Accuracy Control thickness, and can not reduce throughput rate.In addition, also can be in the side of the outer circumferential sides of optical recording media (at this, may take place usually because the corrosion of caused reflection horizon of moisture absorption and recording layer and owing to tear caused peeling) protective seam is provided.So, this example has with respect to the moisture absorption and the high permanance of tearing.In addition, when the screening glass information reproduction on the recording layer side of four layers of optical recording media 112 finishing, can produce information, and can in each layer, not produce any problem.

(example 3)

In addition, produce four layers of optical recording media by immersing the process that forms protective seam 58 in the resin.The formation of protective seam will be described in detail belows.

Figure 12 A has shown according to the process that the immersion resin forms protective seam passed through in the method for manufacturing optical recording media of the present invention to the 12E summary.

The stacked recording medium 55 (referring to Figure 12 A) of supporting in support tool 122.

When the stacked recording medium 55 that is supported just when rotated, the stacked recording medium 55 of this supporting is allowed to the case 123 by being full of the resin that is used for protective seam 120.As the resin that is used for protective seam, the rotation number during immersing is set to 60rpm to use UV curable resin (by the INC-118 of Nippon Kayaku company production), and the immersion time was set to 2.0 seconds.In addition, shown in Figure 12 B, have only zone to be dipped into, so that the inner circumferential side of stacked recording medium 55 can not be immersed in the resin that is used for protective seam from the radius of 8.0mm to outmost periphery.

Control the thickness of the resin that is used for protective seam 120 by the stacked recording medium 55 of rotation immersion.The quantity of rotation is set to 1250rpm, and the thickness of protective seam is controlled as 75 μ m (referring to Figure 12 C).

After adjusting thickness, the resin that is used for protective seam is cured (referring to Figure 12 D) by irradiation UV, and peels off from support tool 122, thereby finishes four layers of optical recording media 121 (referring to Figure 12 E) of producing according to second embodiment.

Figure 10 B is the concise and to the point sectional view according to four layers of optical recording media 121 of this example production.In four layers of optical recording media 121 producing according to this example,, and it is carried out stamping by the adhesive linkage 42 stacked sheet-like substrates that form signal pattern thereon (10A, 10B and 10C).Then, formed thereon on the signal pattern of support substrates 17 of signal pattern and formed recording layer 16.Then, by adhesive linkage 42 stacked stacked sheet material referred to above on support substrates 17, thereby, finish four layers of optical recording media 121 thus by screening glass 120 protection laminations.

According to this example, form protective seam by immersing liquid resin.Therefore, the excircle part (at this, may take place usually owing to the corrosion of caused reflectance coating of moisture absorption and recording sheet with owing to tearing caused peeling) at recording medium forms seamless protective seam 58.Permanance also improves.In process of production, remove bubble and foreign matter like a cork, and need not to form in a vacuum protective seam.Further reuse the resin that is used for protective seam that gets rid of by rotation, so that can not waste the resin that is used for protective seam, and a plurality of sheet materials are immersed in the resin together, this can reduce cost and boost productivity.

When from the recording layer side information reproduction of four layers of optical recording media finishing, information is reproduced and can not produce any problem in each layer.

Claims (6)

1. a method of making recording medium comprises the following steps:

On the surface of sheet-like substrates, form recording layer with inhomogeneous pattern;

The stacked a plurality of sheet-like substrates that formed recording layer thereon of mode with alignment; And

In a concentrated manner a plurality of stacked sheet-like substrates are processed into predetermined contour shape.

2. the method for manufacturing recording medium according to claim 1, wherein, after stacked step and before the step of handling, allow the bonding agent infiltration, so that when the alignment sheet-like substrates, between sheet-like substrates, solidify, thereby a plurality of sheet-like substrates be bonded together.

3. the method for manufacturing recording medium according to claim 2 further comprises the step that intermediary by adhesive linkage one of joins support substrates in the outermost layer of engaged a plurality of sheet-like substrates.

4. the method for manufacturing recording medium according to claim 1 wherein, after the step of handling, forms protective seam in the side of a plurality of sheet-like substrates.

5. the method for manufacturing recording medium according to claim 4 wherein, uses the sheet material of being made by resin or liquid resin to form protective seam.

6. the method for manufacturing recording medium according to claim 1, wherein, use is carried out alignment at the alignment mark that the outside of the information recording area of recording medium is provided with.

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