CN1757067A - Optical recording medium and recording/reproducing method therefor - Google Patents

Abstract

In a single-sided incident type optical recording medium having a plurality of dye containing recording layers, sufficient reflectance and excellent recording characteristics necessary to record or read information in or from a dye containing recording layer positioning farther from a side from which a light beam comes in can be obtained. The optical recording medium has a first substrate ( 21 ) having a guide groove, a first dye containing recording layer ( 22 ), a semitransparent reflective layer ( 23 ), an intermediate layer ( 24 ), a second dye containing recording layer ( 25 ), a reflective layer ( 26 ) and a second substrate ( 27 ) having a guide groove. Information is recorded or read in or from the first dye containing recording layer ( 22 ) and the second dye containing recording layer ( 25 ) by irradiating the light beam from the first substrate's side. The depth of the guide groove on the second substrate is within a range from 1/100xlambda to 1/6xlambda where lambda represents the recording/reading wavelength.

Description

Optical recording media and record/read method thereof

Technical field

The present invention relates to have by write down or read the optical recording media of a plurality of recording layers of information, the record/read method of this optical recording media and the manufacture method of this optical recording media from one side illumination beam such as DVD-R etc.

Background technology

Owing to can store bulk information and arbitrary access easily, extensively approved and popularized such as the external memory storage of signal conditioning packages such as computing machine as being used for such as various types of optical recording medias such as CD-R, CD-RW and MO (magneto-optic disk).Along with the increase of process information amount, exist increasing the demand of recording density.

In various optical recording medias because relatively more cheap and with the read-only optical disc compatibility, so the CD that has a recording layer (be also referred to as and contain dye recording layer) that includes organic dye such as CD-R, DVD-R and DVD+R etc. has obtained using especially widely.

Having in the CD of the recording layer that contains dyestuff with media such as for example CD-R is representative; for example; have stepped construction, in described stepped construction, on the transparent optical disk substrate, have successively and contain dye recording layer and reflection horizon and be used to cover the protective seam that contains dye coating and reflection horizon.Writing down and reading is to use the laser beam of passing base material to carry out.

Same DVD-R (single-surface single-layer DVD-R) as representative has stepped construction; in described stepped construction, on the first transparent optical disk substrate, be formed with successively and contain their protective seam of dye recording layer, reflection horizon and covering; and be arranged on so-called virtual disk (dummy disk) on the protective seam through bonding coat or without bonding coat; it (can be transparent that described virtual disk has the second CD base material; also can be opaque) and; if necessary, be formed at reflection horizon on the second CD base material.Record or to read be to use the laser beam of passing first transparent base from a side of this CD to carry out.Virtual disk can only be transparent or opaque CD base material, or is provided with the layer except that the reflection horizon.

Simultaneously, DVD+R has almost identical with DVD-R structure, will be that representative is described with DVD-R below.

In order to roll up the recording capacity of optical recording media, above-mentioned two single face DVD-R are glued together has the medium of two recording layers with formation, and Here it is known two-sided DVD-R (two-sided DVD-dual layer-R).Writing down or reading is to be undertaken (promptly by illuminating laser beam from each recording layer of two side direction, from a side illuminating laser beam of medium with near the enterprising line item of recording layer of this side or read, simultaneously from the opposite side illuminating laser beam of medium with near the enterprising line item of another recording layer of this opposite side or read).

For optical recording media with a plurality of recording layers, in recent years, existence to single face incident type optical recording media (for example, the demand of single face incident DVD-dual layer-R), on this medium can by from a side illuminating laser beam at the enterprising line item of a plurality of recording layers and reading, thereby avoid increasing the size and sophistication of recording/reading apparatus, can from a plurality of recording layers, read continuously, and improve convenience.

For satisfying above-mentioned needs, for example, proposed to have the double deck type single face incident type DVD-R (single-surface double-layer DVD-R) with two recording layers (for example, with reference to Te Kaipingdi 11-066622 communique) as single face incident type optical recording media of following array structure.

For example, the dual-layer, single-sided incident type DVD-R of adhesion type forms by stack gradually following each layer on the first light transmission base material: can come information is carried out first recording layer of optical recording with laser beam by the irradiation record by what organic dyestuff was made; The part of being made by the semi-transparency reflectance coating that can see through reads first reflection horizon of using laser beam; Can see through and write down with laser beam and the middle layer of reading with laser beam; Can come information is carried out second recording layer of optical recording with laser beam by the irradiation record by what organic dyestuff was made; Second reflection horizon with laser beam is read in reflection; With second base material.

Summary of the invention

Usually, with gathering sill (recess) with spiral fashion or with one heart shape be formed on such as on the base material of optical recording medias such as CD, DVD with the leader record light beam or read light beam.

For example, such as CD-R, DVD-R etc. have and contain in the dye recording layer optical recording media of (hereinafter this being called recording layer), and the degree of depth of gathering sill is about 150nm usually.

When the material that will be used to form recording layer is coated on the base material to make when having the optical recording media of recording layer such as CD or DVD etc.,, bigger at the thickness of recess place recording layer because so the recording layer that forms has been filled the recess on the base material.It has been generally acknowledged that working as track record is formed on the bigger part of thickness (thick film portion; Recess) time, can access excellent record/read characteristic (for example, reflectivity, maximum signal amplitude, polarity etc.).

Maximum signal amplitude is to carry out the resulting value of standardization according to the signal amplitude of blank (space) (the 14T mark/14T blank in the DVD class medium) of mark (mark)/the longest that reflectivity will be the longest.

For this reason, track record all is formed on thick film portion in all commercially available optical recording medias.

Simultaneously, at record or when reading, when when a side of illumination beam is seen, the gathering sill (recess) that is formed on the base material is a protuberance.That is, the recess on the base material is the protuberance of dye recording layer.

Having a plurality of single face incident type optical recording medias (for example, double deck type single face incident type DVD-R etc.) that contain dye recording layer is in the exploitation.

For example, having two single face incident type optical recording medias that contain dye recording layer has first of close light beam irradiates side (light incident side, a side) and contains dye recording layer and contain dye recording layer away from second of this side.In this single face incident type optical recording media, or contain the dye recording layer record or the information that reads is to be undertaken by containing the dye recording layer illumination beam through first from second.

In this single face incident type optical recording media, when as common optical recording media, when the degree of depth that is formed on the gathering sill on the base material that is positioned at a side opposite with the light beam light incident side is about 150nm, then have such possibility, promptly can't obtain being used for or contain the dye recording layer record or read the necessary reflectivity of information from second.

When track record is formed on first recess (thick film portion) that contains dye recording layer and goes up as commercially available optical recording media, can obtain excellent record/read characteristic.Yet, contain the condition of dye recording layer because second condition that contains dye recording layer is different from first, so have the different possibility of preferred track record.

In view of the above problems, an object of the present invention is to provide optical recording media, the manufacture method that is used for record/read method He this optical recording media of this optical recording media, described optical recording media has a plurality of dye recording layers that contain, in described optical recording media by writing down or read information from one side illumination beam, wherein when when being arranged in away from the containing the dye recording layer recorded information or therefrom read information of light beam light incident side, maybe when when containing the dye recording layer recorded information from a side illumination beam opposite or therefrom reading information, can obtain sufficient reflectivity and more excellent record/read characteristic with base material.

Therefore, the invention provides and comprise first base material, first at least and contain the optical recording media that dye recording layer, translucent reflective layer, second contain dye recording layer, reflection horizon and have second base material of gathering sill with gathering sill, in described optical recording media by from the first base material side illumination beam and contain dye recording layer and second first and contain the dye recording layer recorded information or therefrom read information, the degree of depth of the gathering sill of wherein said second base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

The present invention also provides and has comprised first base material, first with gathering sill at least and contain the optical recording media that dye recording layer, translucent reflective layer, second contain dye recording layer, reflection horizon and have second base material of gathering sill, by from the first base material side illumination beam and contain dye recording layer and second first and contain the dye recording layer recorded information or therefrom read information, the degree of depth of the gathering sill of wherein said second base material is shallower than the degree of depth of the gathering sill of described first base material in described optical recording media.

The present invention also further provides the optical recording media that comprises the first information record body and second authenticable information recording, described first information record body contains dye recording layer and translucent reflective layer and stacks gradually having on first base material of gathering sill and form by contain first of first dyestuff to the major general, described second authenticable information recording is by to the major general reflection horizon with contain second of second dyestuff and contain dye recording layer and stack gradually having on second base material of gathering sill and form, described optical recording media is by being bonded together described first information record body and described second authenticable information recording across the optical transparence bonding coat, the opposing face of the base material of the base material of described first information record body and described second authenticable information recording is formed toward each other, in described optical recording media by coming recorded information or therefrom read information from the first base material side illumination beam, the degree of depth of the gathering sill of wherein said second base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

The present invention also further provides has a plurality of optical recording medias that contain dye recording layer, in described optical recording media by writing down or read information from one side illumination beam, wherein being used in the degree of depth that contains the dye recording layer recorded information or therefrom read the gathering sill of information that is in away from the position of this side is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

The present invention also further provides has the optical recording media that contains dye recording layer, reflection horizon and have the base material of gathering sill at least, in described optical recording media by containing the dye recording layer recorded information from a side illumination beam opposite or therefrom reading information with described base material, the degree of depth of the gathering sill of wherein said base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

The present invention also further provides and has been used to comprise first and contains record/read method that dye recording layer and second contains the optical recording media of dye recording layer, contain the dye recording layer recorded information or therefrom read information by containing dye recording layer and have second of thick film portion and film section from one side illumination beam and first in described optical recording media, this record/read method comprises that seeing through first contains dye recording layer illumination beam to the second and contain the film section of dye recording layer and contain recorded information in the dye recording layer or therefrom read the step of information second.

The preferred second thick film portion that contains dye recording layer and film section are corresponding and form with recess and protuberance on the base material respectively, and described base material is arranged on the base material of a side opposite with the light beam light incident side.

Preferred first contains dye recording layer has thick film portion and film section, and the thick film portion that light beam irradiates to the first is contained dye recording layer is to contain in the dye recording layer recorded information or therefrom to read information first.

The preferred first thick film portion that contains dye recording layer and film section are corresponding and form with recess and protuberance on the base material respectively, and described base material is arranged on the base material of light beam light incident side.

The present invention also further provides the optical recording media that comprises the first information record body and second authenticable information recording, described first information record body contains dye recording layer and translucent reflective layer and stacks gradually having on first base material of gathering sill and form by contain first of first dyestuff to the major general, described second authenticable information recording is by to the major general reflection horizon with contain second of second dyestuff and contain dye recording layer and stack gradually having on second base material of gathering sill and form, described optical recording media is by being bonded together described first information record body and described second authenticable information recording through the optical transparence bonding coat, the opposing face of the base material of the base material of first information record body and second authenticable information recording is formed toward each other, in described optical recording media by writing down or read information from the first base material side illumination beam, wherein said second contains dye recording layer has thick film portion and film section, and the film section that light beam irradiates to the second is contained dye recording layer is with recorded information in this film section or therefrom read information.

The present invention also further provides has a plurality of optical recording medias that contain dye recording layer, in described optical recording media by writing down or read information from one side illumination beam, wherein the dye recording layer that contains away from the light beam light incident side has thick film portion and film section, and with light beam irradiates to its film section with recorded information in this film section or therefrom read information.

The present invention also further provides the optical recording medium manufacturing method that is used to make above-mentioned optical recording media, and this manufacture method comprises the step that forms gathering sill with the negative pressure mould on second base material or base material.

According to optical recording media of the present invention, be used for the manufacture method of record/read method and this optical recording media of this optical recording media, when when being arranged in away from the containing the dye recording layer recorded information or therefrom read information of the position of light beam light incident side, can in having a plurality of optical recording medias that contain dye recording layer, obtain sufficient reflectivity and more excellent record/read characteristic, in described optical recording media by writing down or read information from one side illumination beam.When containing the dye recording layer recorded information from a side illumination beam opposite or therefrom reading information, can obtain sufficient reflectivity and more excellent record/read characteristic with base material.

Description of drawings

Fig. 1 has shown the integrally-built synoptic diagram according to the optical recording media of an embodiment of the invention; With

Fig. 2 has shown the integrally-built synoptic diagram according to another optical recording media of an embodiment of the invention.

Embodiment

Below, will be described the example of the manufacture method of optical recording media (write once optical recording medium) according to the embodiment of the present invention, the record/read method that is used for this optical recording media and this optical recording media with reference to Fig. 1 and 2.

(1) structure of optical recording media

Optical recording media according to the present invention is the single face incident type optical recording media with a plurality of recording layers, by can be this optical recording media from one side illuminating laser beam recorded information or therefrom read information.

Optical recording media of the present invention will describe by means of the single face incident type DVD-R (single-surface double-layer type DVD-R, single-surface double-layer type DVD-CD-R) as the double deck type with two recording layers of the single face incident type optical recording media (single face incident type DVD-R) of adhesion type.

Fig. 1 has shown the diagrammatic cross-section of the optical recording media (CD) according to this embodiment.

As shown in Figure 1, optical recording media of the present invention has first recording layer (first contains dye recording layer) 22, translucent reflection horizon (hereinafter this being called translucent reflective layer) 23, transparent adhesive layer (middle layer) 24, cushion 28, second recording layer (second contains dye recording layer) 25 that comprises dyestuff, reflection horizon 26, plate-like second base material 27 that comprises dyestuff successively on plate-like transparent (light transmission) first base material (the first light transmission base material) 21.Light beam shines to write down and to read from first base material, 21 sides.

Optical recording media of the present invention has the first information record body and second authenticable information recording, described first information record body contains dye recording layer 22 and translucent reflective layer 23 and stacks gradually having on first base material 21 of gathering sill and form by contain first of first dyestuff to the major general, and described second authenticable information recording is by to the major general reflection horizon 26 and contain second of second dyestuff and contain dye recording layer 25 and stack gradually having on second base material 27 of gathering sill and form.Described first information record body and described second authenticable information recording be bonded together, make through the optical transparence bonding coat base material of first information record body and second authenticable information recording base material opposing face toward each other.

In optical recording media of the present invention, " transparent (light transmission) " expression is " for being used in the optical recording media recorded information or therefrom to read the light beam of information transparent." transparent (light transmission) layer comprises more or less and to absorb the layer that is used to the light beam that writes down and read.For example, when this layer has more than or equal to 50% the transmissivity of (be preferably greater than or equal 60%) to the wavelength of the light beam that is used to write down or read, can think that this layer is light transmission (transparent).

Below, will be described each layer.

(a) about first base material 21

Preferred first base material 21 has excellent optical, that is, first base material 21 is transparent, has little birefraction, or the like.The reflectivity of first base material 21 (to writing light beam or read the reflectivity of the wavelength of light beam) is usually more than or equal to 1.40, is preferably greater than or equals 1.45, is less than or equal to 1.70 usually, preferably is less than or equal to 1.65.Also preferred first base material 21 has excellent mouldability, that is, first base material 21 is easy to moulding in injection moulding.When first base material had little hydroscopicity, this character was preferred, because can reduce distortion.

In addition, preferred first base material 21 has shape stability so that make optical recording media have to a certain degree rigidity.When second base material 27 had enough shape stabilities, first base material 21 did not always need to have bigger shape stability.

As this material, can use such as resin and glass such as acryl resin, methacrylic resin, polycarbonate resin, polyolefin resin (particularly amorphous polyolefin), vibrin, polystyrene resin, epoxy resin.Alternatively, first base material 21 can be made of a plurality of layers.For example, can on the base material of making by glass or resin etc., be provided with by the resin bed of making such as radiation-hardenable resins such as light-cured resins.

Simultaneously, from optical property, such as the consideration of viewpoints such as high productivities such as mouldability, cost, agent of low hygroscopicity, shape stability, polycarbonate resin is preferred.Consider that from viewpoints such as chemical resistance and agent of low hygroscopicity amorphous polyolefin is preferred.Consider that from viewpoints such as high-speed responses glass baseplate is preferred.

The preferred first thin base material 21.Preferred first base material 21 has the thickness that is less than or equal to 2mm, is more preferably less than or equals 1mm.Distance between object lens and the recording layer is more little, and base material is thin more, and then coma is more little, and this is favourable to increasing recording density.In order to obtain enough optical properties, hydroscopicity, mouldability and shape stability, need thickness to a certain degree.Thereby the thickness of preferred first base material 21 is usually more than or equal to 10 μ m, more preferably greater than or equal 30 μ m.

In order simultaneously in first recording layer 22 of this optical recording media of the present invention and second recording layer 25, successfully to write down and to read, need suitably adjust the distance between object lens and two recording layers.For example, preferably with the focal point settings of object lens at the intermediate point of two recording layers almost, this is because the access of two recording layers is become easy.

More specifically, in DVD-ROM or DVD-R system, when the thickness of base material is 0.6mm, the distance between object lens and the recording layer can be transferred to optimum.

When this layer structure and DVD-ROM were compatible, most preferably the thickness of first base material 21 obtained by half that deducts from 0.6mm as the thickness of the transparent adhesive layer 24 in middle layer.If like this, the approximate intermediate point between two-layer is about 0.6mm, thereby focus servo control all is easy to carry out on two recording layers.

When such as another layer such as cushion or protective seam when being present between second recording layer 25 and the translucent reflective layer 23, most preferably half of the thickness sum of the thickness of first base material 21 by deducting this layer and transparent adhesive layer from 0.6mm obtains.

Be used for leader record or record that the information that reads is used/read light (record/read light beam; For example, (gathering sill) 31 of groove laser beam) is formed on first base material 21 with spiral fashion or concentric shape.When this groove 31 is formed on the base material 21 like this, recess and protuberance on the surface of base material 21, have been formed.The recess (groove) of this irregular body is called groove, and protuberance is called piston ring land.With groove and piston ring land as track record with recorded information in first recording layer 22 or therefrom read information.Incidentally, the groove 31 on first base material 21 is a protuberance with respect to the direction of light beam irradiates.

In the situation of so-called DVD-R CD, i.e. record on this CD and to read be to be that the laser beam of 650nm is carried out in the situation that optically focused carries out by being 0.6～0.65 object lens to wavelength with numerical aperture for example, normally coating forms first recording layer 22 on first base material 21, make the groove (recess) on first base material 21 locate to have bigger thickness, this suits for writing down or reading.Therefore preferably groove is used as track record.

Be formed on the degree of depth (depth of groove of the groove 31 on first base material 21; First contains the height of the protuberance of dye recording layer) be preferably greater than or equal 1/10 * λ, wherein λ represents record/read wavelength, and this is because can fully guarantee reflectivity.The degree of depth of groove 31 more preferably greater than or equal 1/8 * λ, further more preferably greater than or equal 1/6 * λ.For example, when the wavelength of record/read light beam (record/read wavelength) was λ=650nm, the degree of depth of first base material, 21 upper grooves was preferably greater than or equals 65nm, more preferably greater than or equal 81nm, further more preferably greater than or equal 108nm.

The degree of depth of the groove 31 on first base material 21 preferably is less than or equal to 2/4 * λ, and this is because the transfer printing of groove shapes is improved.More preferably the degree of depth of groove 31 is less than or equal to 2/5 * λ, further is more preferably less than or equals 2/6 * λ.For example, when record/read wavelength was λ=650nm, the degree of depth of the groove 31 on first base material 21 preferably was less than or equal to 325nm, was more preferably less than or equaled 260nm, further was more preferably less than or equaled 217nm.

Width (the recess width of the groove 31 on preferred first base material 21; First contains the width of the protuberance of dye recording layer; Half-breadth) more than or equal to 1/10 * T, wherein T represents track space, and this is because can guarantee sufficient reflectivity.More preferably the width of groove 31 is more than or equal to 2/10 * T, further more preferably greater than or equal 3/10 * T.For example, when track space was 740nm, the width of the groove 31 on first base material 21 was preferably greater than or equals 74nm, more preferably greater than or equal 148nm, further more preferably greater than or equal 222nm.

The width of the groove 31 on preferred first base material 21 is less than or equal to 9/10 * T, and this is because can obtain the transfer printing of excellent groove shapes.The width of groove 31 is more preferably less than or equals 8/10 * T, further is more preferably less than or equals 7/10 * T.For example, when track space was 740nm, the width of the groove 31 on first base material 21 preferably was less than or equal to 666nm, was more preferably less than or equaled 592nm, further was more preferably less than or equaled 518nm.

In the situation of groove record, the groove 31 on first base material 21 is slightly crawled to form swing on radial direction with predetermined amplitude and preset frequency.In the piston ring land between the groove 31 on first base material 21, form isolated pit (address pit) with certain rule and (be called land pre-pit; LPP).Address information can be with land pre-pit record in advance.Other recessed/convex-concave hole (pre-pit) can form as required.

Consider preferably have the base material of this recess and protuberance with the injection moulding manufactured with pressing mold with recess and protuberance from the angle of cost.In the time of on will being formed on, can on resin bed, form such as irregular bodies such as track records by the resin bed of making such as radiation-hardenable resins such as light-cured resins by the base material of making such as glass etc.

(b) about first recording layer 22

Usually, the light sensitivity of first recording layer 22 almost with single face recording medium (for example, CD-R, DVD-R, DVD+R) etc. in the light sensitivity of employed recording layer identical.

For realizing excellent record/read characteristic, the low exothermicity dyestuff that preferred first recording layer 22 comprises low exothermicity and has high index of refraction.

The refractive index of employed dyestuff in first recording layer 22 (to writing light beam or read the refractive index of the wavelength of light beam) is usually more than or equal to 1.00, is preferably greater than or equals 1.50, and be less than or equal to 3.00 usually.

The extinction coefficient of employed dyestuff in first recording layer 22 (to writing light beam or read the extinction coefficient of the wavelength of light beam) is less than or equal to 0.50 usually, preferably is less than or equal to 0.30.When extinction coefficient was excessive, the absorption that contains dye recording layer became excessive, thereby caused the decline of reflectivity.Yet for the purpose of writing down, absorption to a certain degree is preferred.Therefore, although there is not special lower limit, extinction coefficient is usually more than or equal to 0.001.

In addition, the combination of first recording layer 22 and translucent reflective layer 23 preferably reflection of light, see through and the proper range that absorbs in, improved the record light sensitivity thus and reduced the heat in the recording process and disturbed.

As this organic dye material, big ring azepine annulene dyestuff (phthalocyanine dye, naphthalene phthalocyanine dye, porphyrin dye etc.), pyrroles's methylene dye, polymethin dyes (cyanine dye, merocyanine dyes, interior (squalirium) dyestuff of side's acid etc.), anthraquinone dye, Azulene (azulenium) dyestuff, metal complex azo dyes, metal complex indoaniline dyes etc. are arranged.

In above-mentioned various organic dyestuff, preferable alloy complex compound azoic dye, this is because they have excellent record light sensitivity, permanance and photostability.Particularly, preferably by following general formula (I) or (II) representative compound:

(wherein encircle A ¹With ring A ²Be nitrogenous aromatic heterocycle, can have substituting group independently of one another; Ring B ¹With ring B ²Be aromatic rings, can have substituting group independently of one another; X is that to have two substituent carbon numbers of fluorine atom at least be 1～6 alkyl).

Employed organic dyestuff is preferably maximum absorption wavelength λ maximum and is in the visible light that the is about 350nm～900nm dye composition in the near infrared scope in the recording layer of optical recording media of the present invention, and is suitable for carrying out record with blueness to the laser of nearly microwave.More preferably being suitable for the wavelength that is generally used for CD-R is that about 770nm～830nm (typically is 780nm, 830nm etc.) near-infrared laser, the wavelength that is used for DVD-R (typically are 635nm for about 620nm～690nm, 650nm, 680nm etc.) dyestuff that the so-called blue laser that red laser or wavelength are about 340nm～530nm (typically being 410nm or 515nm etc.) writes down.

Can use a kind of dyestuff, or the dyestuff of two or more identical or different kind is mixed and use.In addition, can use jointly at the dyestuff that a plurality of wavelength write down with writing light beam, to realize writing down the optical recording media that adapts with laser beam with a plurality of wave bands with being suitable for.

First recording layer 22 (for example can contain transition metal chelate, acetylacetone chelate, two phenyl two mercaptan, salicylaldoxime, two two sulphur-α-diketone etc.) as singlet oxygen quencher with the stable recording layer or improve photostability, or contain such as record light sensitivity improvers such as metal species compounds to improve the record light sensitivity.Herein, described metal species compound be such as metals such as transition metal with atom, ion or bunch etc. form be included in metal species compound in the compound.As this metal species compound, for example, comprise organometallics such as ethylenediamine complex compound, azomethine complex compound, phenylhydroxylamine complex compound, phenanthroline complex compound, dihydroxy azobenzene complex compound, dioxime complex compound, nitroso-amino-phenol complex compound, pyridine radicals triazine complex compound, acetylacetonate complex, metallocene, porphyrin complex etc.Metallic atom is not limited, but preferred transition metal.

In addition, as required, bonding agent, levelling agent and defoamer etc. can use jointly to make first recording layer 22 of optical recording media of the present invention.As preferred adhesive, comprise poly-(vinyl alcohol), poly-(vinyl pyrrolidone), nitrocellulose, cellulose acetate, ketone resin, acryl resin, polystyrene resin, urethane resin, poly-(ethene butyral), polycarbonate, polyolefin etc.

Thickness to first recording layer 22 is not done concrete qualification, this be because suitable thickness with the difference of recording method etc. difference.Yet for obtaining enough modulation amplitudes, thickness is preferably greater than or equals 5nm usually, more preferably greater than or equal 10nm, be preferably greater than especially or equal 20nm.Yet recording layer does not need blocked up so that light can suitably pass optical recording media of the present invention.Thereby the thickness of recording layer is less than or equal to 3 μ m usually, preferably is less than or equal to 1 μ m, is more preferably less than or equals 200nm.The thickness of first recording layer 22 from the groove to the piston ring land is different.In optical recording media of the present invention, the thickness of first recording layer 22 is the thickness at base material upper groove place.

As the deposition process of first recording layer 22, can adopt the thin film deposition of usually being carried out, such as vacuum evaporation, sputtering method, scrape the skill in using a kitchen knife in cookery, casting, rotary coating or infusion process etc.Consider preferred rotary coating from the viewpoint of productivity and cost.Vacuum evaporation than rubbing method more preferably because it can produce the recording layer with uniform thickness.

When depositing with rotary coating, rotating speed is preferably 10rpm～15000rpm.After rotary coating, can anneal or apply operations such as solvent vapo(u)r.

As when such as scraping in the coating processes such as the skill in using a kitchen knife in cookery, casting method, rotary coating or infusion process employed coating solvent when forming first recording layer 22, the type of solvent is not limited, thereby can use any solvent, need only it and can not corrode base material.For example, comprise such as keto-alcohol type solvents such as diacetone alcohol and 3-hydroxy-3-methyl-2-butanone, such as cellosolve type solvents such as methyl cellosolve and ethyl cellosolves, such as chain hydrocarbon type solvents such as normal hexane and normal octanes, such as cyclic hydrocarbon type solvents such as cyclohexane, methylcyclohexane, ethyl cyclohexane, dimethyl cyclohexane, n-butyl cyclohexane, tert-butyl group cyclohexane, cyclooctane, such as perfluoroalkyls such as tetrafluoropropanol, octafluoropentanol, hexafluoro butanols alcohol type solvent, such as hydroxycarboxylic acid esters type solvents such as methyl lactate, ethyl lactate, 2-hydroxy-methyl isobutyl acids etc.

In the situation of vacuum vapor deposition method, for example, will be placed on the crucible that places internal vacuum chamber such as organic dyestuff and recording layer compounds such as various adjuvants as required, the inside of vacuum chamber is evacuated to about 10 with suitable vacuum pump ^-2Pa～10 ^-5Pa, afterwards, with crucible heating with evaporation recording layer composition, described recording layer composition be deposited on crucible base material staggered relatively on, form first recording layer 22 thus.

(c) about translucent reflective layer 23

Translucent reflective layer 23 is to have the to a certain degree reflection horizon of light transmission.That is, translucent reflective layer 23 is the reflection horizon with less absorption (record/read the absorption of light beam), the transmittance more than or equal to 40% and suitable light reflectivity (usually more than or equal to 30%).For example, have the thin metal film of high reflectance, can obtain suitable transmissivity by setting.Preferred translucent reflective layer 23 has corrosion resistance to a certain degree.In addition, preferred translucent reflective layer 23 has barrier property, so that first recording layer 22 can be affected because of the leakage on the upper strata (being transparent adhesive layer 24) of translucent reflective layer 23 herein.

In order to ensure high-transmission rate, the thickness of translucent reflective layer 23 preferably is less than or equal to 50nm usually.The thickness of translucent reflective layer 23 is more preferably less than or equals 30nm, further is more preferably less than or equals 25nm.Yet translucent reflective layer 23 need have thickness to a certain degree, with the influence on the upper strata of avoiding the translucent reflective layer 23 on first recording layer 22.Therefore, the thickness of translucent reflective layer 23 is usually more than or equal to 3nm, more preferably greater than or equal 5nm.

Material as translucent reflective layer 23, can use following metal or semimetal separately or with the form of alloy, such as Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta, Pd, Mg, Se, Hf, V, Nb, Ru, W, Mn, Re, Fe, Co, Rh, Ir, Zn, Cd, Ga, In, Si, Ge, Te, Pb, Po, Sn, Bi and rare earth metal, they have suitable high reflectance at the wavelength place that reads light beam.Wherein, Au, Al and Ag have high reflectance, thereby are suitable for the material as translucent reflective layer 23.Translucent reflective layer 23 can contain except that above-mentioned as other compositions the material of principal ingredient.

Because its low cost and high reflectance, containing Ag is particularly preferred as the material of principal ingredient.Herein, principal ingredient is meant that the material that is contained is more than or equal to 50%.

Because translucent reflective layer 23 has thin thickness, so the big crystal grain of film can cause reading noise.Thereby, the preferred material that uses with little crystal grain.Because fine silver tends to have big crystal grain, the therefore preferred silver that uses alloy form.

Particularly, preferably contain Ag, and contain at least a element that is selected from Ti, Zn, Cu, Pd, Au and rare earth metal of 0.1 atom %～15 atom % as principal ingredient.During in containing Ti, Zn, Cu, Pd, Au and rare earth metal two or more, each in these elements all can be 0.5 atom %～15 atom %.Yet the summation of these elements is preferably 0.1 atom %～15 atom %.

Particularly preferred alloy composition is to contain Ag as principal ingredient, and contains at least a element that is selected from Ti, Zn, Cu, Pd and Au of 0.1 atom %～1.5 atom %, and at least a rare earth metal of 0.1 atom %～15 atom %.In rare earth metal, neodymium is particularly preferred.More specifically, preferred AgPdCu, AgCuAu, AgCuAuNd, AgCuNd etc.

As translucent reflective layer 23, only the layer that is made of Au is preferred, and this is because it has little crystal grain and corrosion resistance, but it is than Ag alloy costliness.

In addition, can use by Si constitute the layer as translucent reflective layer 23.

Film of making by the material except that metal with antiradar reflectivity and the film with high reflectance can be piled up alternately with the formation multilayer film, and used as the reflection horizon.

Method as forming translucent reflective layer 23 can adopt, for example, and sputter, ion plating, chemical vapor deposition, vacuum evaporation etc.Inorganic or organic middle layer and bonding coat can be set to improve reflectivity, recording characteristic and bond properties between first base material 21 and translucent reflective layer 23.For example, middle layer (or bonding coat), first recording layer 22 and middle layer (or bonding coat) and translucent reflective layer 23 can be stacked gradually on first base material 21 between first base material 21 and first recording layer 22, providing middle layer (or bonding coat), and between first recording layer 22 and translucent reflective layer 23, provide middle layer (or bonding coat).

(d) about transparent adhesive layer 24

It is transparent that bonding coat 24 requires.The high adherence of bonding coat 24 and this layer curing and when bonding less shrinkage factor can bring the stability of shape of medium, this is preferred.

The refractive index of transparent adhesive layer 24 (to writing light beam or read the refractive index of the wavelength of light beam) is usually more than or equal to 1.40, is preferably greater than or equals 1.45, is less than or equal to 1.70 usually, preferably is less than or equal to 1.65.

Preferably clear bonding coat 24 is made of the material that can not damage second recording layer 25.It is because transparent adhesive layer 24 is made of resin usually that transparent adhesive layer 24 is easy to compatible with second recording layer 25.Given this, following cushion 28 preferably is set to prevent transparent adhesive layer 24 dissolving second recording layers 25 and it is caused damage between the transparent adhesive layer 24 and second recording layer 25.

In addition, preferably clear bonding coat 24 is made of the material that can not damage translucent reflective layer 23.Can provide between two-layer known inorganic or organic buffer layer to avoid infringement.

In optical recording media of the present invention, the thickness of preferred accurately control transparent adhesive layer 24.The thickness of normally transparent bonding coat 24 is preferably greater than or equals 5 μ m.Must between two recording layers, provide certain distance so that respectively two enterprising line focusing servocontrol of recording layer.Although the thickness of transparent adhesive layer 24 depends on focus servo mechanism, require this thickness more than or equal to 5 μ m usually, be preferably greater than or equal 10 μ m.

Usually numerical aperture of objective is big more, and then the distance between two recording layers just can be more little.Yet, when transparent adhesive layer 24 is blocked up, need the flower long time to regulate focus servo, and the object lens long distance ground of having to moves, so is disadvantageous two recording layers.In addition, blocked up layer need solidify for a long time, and this can cause productive decline.Thereby the thickness of transparent adhesive layer 24 preferably is less than or equal to 100 μ m.

As the material of transparent adhesive layer 24, for example, available is thermoplastic resin, thermoset resin, electronic beam curing resin, uv curing resin (comprise and postpone curing type) etc.

Can by thermoplastic resin or thermoset resin etc. is dissolved in The suitable solvent with the preparation coating liquid, use this liquid and dry (heating) this liquid forms transparent adhesive layer 24.In using the situation of uv curing resin, can by with the resin direct liquefaction or with resin dissolves in The suitable solvent with the preparation coating liquid, be coated with this coating liquid, and irradiation ultraviolet radiation is to form transparent adhesive layer 24 with resin solidification.There are various types of uv curing resins.Yet, can use any in them, as long as it is transparent.Can use a kind of in these materials or several mixing in these materials are used.Individual layer and multilayer all are suitable for.

As coating process, identical with recording layer, be suitable for such as coating processes such as rotary coating or castings.Wherein, preferred rotary coating.Having full-bodied resin can be coated with serigraphy etc.The use of the uv curing resin that liquefies under 20 ℃～40 ℃ temperature is preferred, and this is because this resin of coating needn't use solvent.Preferred this resin of so preparation makes that the viscosity of this resin is 20mPas～1000mPas.

Incidentally, can use the pressure sensitive double sticky tape, this adhesive tape be placed between the stepped construction and to it pressurize to form bonding coat.

As ultraviolet-curing adhesive, there are free radical type ultraviolet-curing adhesive and cationic ultraviolet-curing adhesive, these two kinds all can be used.

As the free radical type ultraviolet-curing adhesive, all known compositions all can use.Can use and contain ultra-violet solidified compound and photopolymerization initiator composition as neccessary composition.As ultra-violet solidified compound, can use simple function group (methyl) acrylate or polyfunctional group (methyl) acrylate as the polymerizable monomer composition.These compounds can use separately, or two or more is used in combination.In the present invention, acrylate and methacrylate are collectively referred to as (methyl) acrylate.

For example, following substances is can be as the polymerizable monomer of this optical recording media.As simple function group (methyl) acrylate, for example comprise having following group as substituent (methyl) acrylate etc.: methyl, ethyl, propyl group, butyl, amyl group, the 2-ethylhexyl, octyl group, nonyl, dodecyl, cetyl, octadecyl, cyclohexyl, benzyl, methoxy ethyl, butoxyethyl group, the phenoxy group ethyl, the Nonylphenoxy ethyl, tetrahydrofurfuryl, glycidyl, the 2-hydroxyethyl, the 2-hydroxypropyl, 3-chloro-2-hydroxypropyl, dimethyl aminoethyl, the diethylamino ethyl, the Nonylphenoxy ethyl tetrahydrofurfuryl, the tetrahydrofurfuryl of caprolactone modification, isobornyl, two cyclopentyl, dicyclopentenyl or dicyclopentenyl oxygen ethyl etc.

As polyfunctional group (methyl) acrylate, comprise 1, the 3-butylene glycol, 1, the 4-butylene glycol, 1, the 5-pentanediol, the 3-methyl isophthalic acid, the 5-pentanediol, 1, the 6-hexanediol, neopentyl glycol, 1, the 8-ethohexadiol, 1, the 9-nonanediol, three ring decyl dimethanols, ethylene glycol, polyglycol, propylene glycol, dipropylene glycol, tripropylene glycol, two (methyl) acrylate that polypropylene glycol etc. and two (methyl) acrylic acid forms, two (methyl) acrylate of three (2-hydroxyethyl) isocyanuric acid ester, by at least 4 moles of ethylene oxide or epoxypropane being added into two (methyl) acrylate of resulting dibasic alcohol in 1 mole the neopentyl glycol, by 2 moles of ethylene oxide or epoxypropane being added into two (methyl) acrylate of resulting dibasic alcohol in 1 mole of bisphenol-A, two (methyl) acrylate or three (methyl) acrylate of resulting trihydroxy alcohol in the trimethylolpropane that oxirane by will at least 3 moles or epoxypropane are added into 1 mole, two (methyl) acrylate that oxirane by will at least 4 moles or epoxypropane are added into resulting dibasic alcohol in 1 mole of bisphenol-A, trimethylolpropane tris (methyl) acrylate, pentaerythrite three (methyl) acrylate, many (methyl) acrylate of dipentaerythritol, the phosphoric acid of oxirane modification (methyl) acrylate, alkylation phosphoric acid (methyl) acrylate of oxirane modification etc.

As polyreactive oligomers, can common what use be polyester (methyl) acrylate, polyethers (methyl) acrylate, epoxy (methyl) acrylate or polyurethane (methyl) acrylate etc. with polymerizable monomer.

As the photopolymerization initiator that is used for optical recording media of the present invention, any known initiating agent that can solidify employed ultra-violet solidified compound by polyreactive oligomers and/or polymerizable monomer representative all can use.As photopolymerization initiator, molecule cracking type or hydrogen-abstraction photopolymerization initiator are suitable.

As this photopolymerization initiator; what be suitable for using is benzoin isobutyl ether, 2; 4-diethyl thioxanthone, 2-isopropyl thioxanthone, benzyl, 2; 4; 6-trimethylbenzene formyl diphenyl phosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholino phenyl)-butane-1-ketone, two (2; 6-dimethoxy benzoyl)-2,4,4-trimethylphenyl phosphine oxide etc.As molecule cracking type photopolymerization initiator in addition, can use 1-hydroxycyclohexylphenylketone, benzoin ethylether, benzyl dimethyl ketal, 2-hydroxyl 2-methyl isophthalic acid-phenyl-propane-1-ketone, 1-(4-isopropyl phenyl)-2-hydroxy-2-methyl propane-1-ketone and 2-methyl isophthalic acid-(4-methyl thio-phenyl)-2-morpholino propane-1-ketone etc. jointly.In addition, can use jointly benzophenone, 4-phenyl benzophenone, isophthaloyl base phenyl ketone or 4-benzoyl-4 '-methyl-diphenyl sulfide etc., these compounds are the hydrogen-abstraction photopolymerization initiator.

Sensitizer as photopolymerization initiator, can use jointly not can with the amine of above-mentioned polymerism composition generation addition reaction, such as trimethylamine, methyl dimethoxy hydramine, triethanolamine, to the diethylamino acetophenone, to the dimethyl aminoethyl benzoic ether, to dimethylamino isoamyl benzene formic ether, N, N-dimethyl benzylamine or 4,4 '-two (diethylamino) Benzophenone etc.Preferred select and use to UV cured property compound have excellent dissolubility and can not hinder the above-mentioned photopolymerization initiator of ultraviolet (uv) transmission and sensitizer in a kind of.

As cationic ultraviolet-curing adhesive, can use all known compositions.The epoxy resin that contains the photopolymerization initiator of cationic polymerization type is consistent therewith.As cationic poly mould assembly photoinitiators, comprise sulfonium salt, salt compounded of iodine, diazo salt or the like.

As the example of salt compounded of iodine, comprise hexafluorophosphoric acid diphenyl iodine, hexafluoro-antimonic acid diphenyl iodine, tetrafluoro boric acid diphenyl iodine, four (pentafluorophenyl group) boric acid diphenyl iodine, hexafluorophosphoric acid two (dodecylphenyl) iodine, hexafluoro-antimonic acid two (dodecylphenyl) iodine, tetrafluoro boric acid two (dodecylphenyl) iodine, four (pentafluorophenyl group) boric acid two (dodecylphenyl) iodine, hexafluorophosphoric acid 4-aminomethyl phenyl-4-(1-Methylethyl) phenyl-iodide, hexafluoro-antimonic acid 4-aminomethyl phenyl-4-(1-Methylethyl) phenyl-iodide, tetrafluoro boric acid 4-aminomethyl phenyl-4-(1-Methylethyl) phenyl-iodide, four (pentafluorophenyl group) boric acid 4-aminomethyl phenyl-4-(1-Methylethyl) phenyl-iodide etc.

As epoxy resin, can enumerate any in bisphenol-A-chloropropylene oxide type epoxy resin, cycloaliphatic epoxy resin, long-chain fat family type epoxy resin, brominated epoxy resin, glycidyl ester type epoxy resin, diglycidyl ether type epoxy, the heterocyclic epoxy resin etc.

As epoxy resin, the free chlorine that preferred use is discharged and the less epoxy resin of content of chlorion are to avoid this resin infringement reflection horizon.The amount of chlorine preferably is less than or equal to 1 weight %, is more preferably less than or equals 0.5 weight %.

With respect to the cationic uv curing resin of 100 weight portions, the ratio of cationic polymerization type photoinitiators is 0.1 weight portion～20 weight portions normally, are preferably 0.2 weight portion～5 weight portions.For the wavelength of near ultraviolet band in the wave band that more effectively uses ultraviolet light source or visible region, can use known light sensitizer jointly.As this light sensitizer, comprise anthracene, phenothiazine, benzyl methyl ketal, benzophenone, acetophenone etc.

In order to improve the various performances of ultraviolet-curing adhesive; as required, can add thermal polymerization inhibitor as other adjuvants, antioxidant, plastifier by representatives such as hindered phenol, hindered amine, phosphite esters, by the silane coupling agent of representatives such as epoxy silane, hydrosulphonyl silane, (methyl) acryloyl group silane etc.Wherein, can select and use ultra-violet solidified compound is had excellent dissolubility and do not hinder the material of ultraviolet (uv) transmission.

(e) about second recording layer 25

Second recording layer 25 has usually than the higher light sensitivity of recording layer that is used for single face recording medium (for example, CD-R, DVD-R, DVD+R) etc.In this optical recording media, because the energy of incident beam descends because of the existence of first recording layer 22 and translucent reflective layer 23 etc., therefore record is to carry out with half energy of pact.Thereby second recording layer 25 need have extra high light sensitivity.

In order to realize excellent record/read characteristic, preferred coloring agent produces less heat and also has bigger refractive index.

The refractive index of employed dyestuff in second recording layer 25 (to writing light beam or read the refractive index of the wavelength of light beam) is usually more than or equal to 1.00, is preferably greater than or equals 1.50, and be less than or equal to 3.00 usually.

The extinction coefficient of employed dyestuff in second recording layer 25 (to writing light beam or read the extinction coefficient of the wavelength of light beam) is less than or equal to 0.50 usually, preferably is less than or equal to 0.30.When this extinction coefficient was excessive, the absorption of dye recording layer became excessive, and this can cause the decline of reflectivity.Absorption to a certain degree is preferred for record, although therefore it does not have lower limit, extinction coefficient is usually more than or equal to 0.001.

In addition, the combination in preferred second recording layer 25 and reflection horizon 26 can provide the proper range of beam reflection and absorption.Thus, can improve the heat that writes down light sensitivity and can reduce to write down the time disturbs.

The material of second recording layer 25 and deposition process be identical with first recording layer 22 almost, thereby hereinafter only the difference between them is described.

Thickness to second recording layer 25 is not done concrete qualification, and this is because suitable thickness changes with recording method etc.For obtaining enough modulation amplitudes, the thickness of common second recording layer 25 is preferably greater than or equals 10nm, more preferably greater than or equal 30nm, be preferably greater than especially or equal 50nm.Yet this film needs can not be blocked up, so that obtain suitable reflectivity, so thickness is less than or equal to 3 μ m usually, preferably is less than or equal to 1 μ m, is more preferably less than or equals 200nm.Herein, the thickness of second recording layer 25 thickness of thick film portion normally.

The material that is used for first recording layer 22 and second recording layer 25 can be same to each other or different to each other.

(f) about reflection horizon 26

Reflection horizon 26 need have high reflectance.Preferred reflection horizon 26 has high-durability.

In order to ensure high reflectance, usually the thickness in reflection horizon 26 is preferably greater than or equals 20nm, more preferably greater than or equal 30nm, further more preferably greater than or equal 50nm.For the pitch time that shortens production and reduce cost, preferred reflection horizon 26 is as thin as to a certain degree.Thereby thickness is less than or equal to 400nm usually, is more preferably less than or equals 300nm.

As the material in reflection horizon 26, for example, can use the metal that has enough high reflectances at the wavelength place that reads light beam separately or with the form of alloy, such as Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta and Pd etc.Wherein, owing to have high reflectance, Au, Al and Ag are suitable as the material in reflection horizon 26.Except these were used as the material of principal ingredient, following substances can be contained as other compositions in reflection horizon 26.As the example of other compositions, comprise such as metals such as Mg, Se, Hf, V, Nb, Ru, W, Mn, Re, Fe, Co, Rh, Ir, Cu, Zn, Cd, Ga, In, Si, Ge, Te, Pb, Po, Sn, Bi and rare earth metals, and semimetal.

Because its cost is low, therefore containing Ag is particularly preferred as the film of principal ingredient, and when following printing receiving layer further was set, it provided high reflectance and beautiful white background color.Herein, " principal ingredient " is meant that its content compares the composition more than or equal to 50%.

In order to ensure the high-durability (high corrosion-resistant) in reflection horizon 26, preferably use the Ag of alloy form, rather than fine silver.

In the middle of alloy, containing Ag is preferred as principal ingredient and the alloy that is selected from least a element in Ti, Zn, Cu, Pd, Au and the rare earth metal that contains 0.1 atom %～15 atom %.When this alloy contains in Ti, Zn, Cu, Pd, Au and the rare earth metal two or more, their the content 0.1 atom %～15 atom % that can respectively do for oneself.Yet preferably its summation is 0.1 atom %～15 atom %.

The particularly preferred composition of this alloy is to contain Ag as principal ingredient, and contains at least a element that is selected from Ti, Zn, Cu, Pd and Au of 0.1 atom %～15 atom %, and at least a rare earth element of 0.1 atom %～15 atom %.In rare earth element, neodymium is particularly preferred.More specifically, AgPdCu, AgCuAu, AgCuAuNd or AgCuNd etc. are preferred.

As reflection horizon 26, only the layer that is made of Au is preferred, and this is because of its high-durability (highly corrosion resistant), but it is more expensive than the layer that is made of the Ag alloy.

Film of making by the material except that metal with antiradar reflectivity and the film with high reflectance can be piled up alternately with the formation multilayer film, and used as reflection horizon 26.

Method as forming reflection horizon 26 for example, has sputter, ion plating, chemical vapor deposition, vacuum evaporation etc.Can on the upper surface in reflection horizon 26 and lower surface, known inorganic or organic middle layer or bonding coat be set, to improve reflectivity, recording characteristic, bond properties etc.

(g) about second base material 27

Preferred second base material 27 has shape stability so that optical recording media has rigidity to a certain degree.That is, preferred second base material 27 has high mechanical stability and big rigidity.

As such material, can use such as resins such as acryl resin, methacrylic resin, polycarbonate resin, polyolefin resin (particularly amorphous polyolefin), vibrin, polystyrene resin, epoxy resin, and glass.

Second base material 27 can be made of a plurality of layers.For example, can on the base material that constitutes by glass or resin etc., form by the resin bed that constitutes such as radiation-hardenable resins such as light-cured resins to be used as second base material.

When first base material 21 did not possess enough shape stabilities, second base material 27 need have big shape stability especially as mentioned above.By this viewpoint, preferred second base material 27 has agent of low hygroscopicity.

Second base material 27 is not necessarily transparent.When second base material 27 was transparent, the refractive index of second base material 27 (to writing light beam or read the refractive index of light beam wavelength) was usually more than or equal to 1.40, was preferably greater than or equaled 1.45, and be less than or equal to 1.70 usually, preferably was less than or equal to 1.65.

As such material, can use and the identical materials that is used for first base material 21.In addition, can also use by containing the Al alloy base material that Al makes as Al-Mg alloy of principal ingredient etc., by containing the Mg alloy base material that Mg makes as Mg-Zn alloy of principal ingredient etc., the base material of making by any material in silicon, titanium and the pottery, or base material by the above-mentioned material combination is made.

Consider that from viewpoint above-mentioned resin is preferred such as high productivitys such as mouldability, cost, agent of low hygroscopicity, shape stability etc.Optimization polycarbonate particularly.Consider preferred amorphous polyolefin from the viewpoint of chemical resistance, agent of low hygroscopicity etc.Consider the preferred glass base material from viewpoints such as high-speed responses.

For enough rigidity being provided for this optical recording media, preferred second base material 27 is thick in to a certain degree, has the thickness more than or equal to 0.3mm.Yet because second base material 27 is thin more, just favourable more to making thinner recording/reading apparatus, therefore the thickness of second base material 27 preferably is less than or equal to 3mm, is more preferably less than or equals 1.5mm.

The examples of first base material 21 and the preferred combination of second base material 27 are that first base material 21 and second base material 27 are made of identical materials, and have identical thickness.By doing like this, then first base material 21 is identical with the rigidity of second base material 27, and good balance can be provided.Thus, medium is difficult for being out of shape because of the variation of environment, is preferred therefore.In this case, the deformation extent of two kinds of base materials that preferably caused by environmental change is consistent with direction.

As another preference of this combination, first base material 21 is as thin as about 0.1mm, and second base material 27 is thick in about 1.1mm.By doing like this, object lens are easy near recording layer, and recording density is easy to increase thus.Thereby this is preferred.In this case, first base material 21 can be a sheet, and can not have gathering sill.

Be used for the record that the leader record or the information that reads uses/read light (record/read light beam, for example, laser beam) groove (gathering sill) 32 with spiral fashion or with one heart shape be formed on second base material 27.When groove was formed on second base material 27 like this, irregular body was formed on the surface of second base material 27.The recess of irregular body (ditch) is called groove, and protuberance is called piston ring land.Incidentally, the groove 32 on second base material 27 is a protuberance with respect to the direction of illumination of light beam.

Because second recording layer 25 forms through coating on the reflection horizon 26 that is formed on second base material 27, therefore the thickness located of the groove (recess) of second recording layer 25 on second base material 27 big (this one is called thick film portion), and the thickness less (this one is called film section) that its piston ring land (protuberance) on second base material 27 is located.

In this embodiment, recording of information or read the groove and/or the piston ring land that can be used as track record and on second recording layer 25, carry out, this is because less in the degree of depth of this groove 32, described below.

In the situation of this groove record, the groove 32 on second base material 27 is slightly crawled to form swing under predetermined amplitude and preset frequency on radial direction.Isolated pit (address pit) can form in the piston ring land between the groove 32 on second base material 27 (is called land pre-pit; LPP), and address information can be with land pre-pit record in advance.Other recessed/convex-concave hole (pre-pit) can form as required.

According to this embodiment, in the situation of piston ring land record, the groove walls of the groove 32 on second base material 27 is slightly being crawled to form swing in piston ring land under predetermined amplitude and preset frequency on the radial direction.Address information or other information can be by in this groove, forming pit record in advance.

Consider preferably have second base material 27 of this recess and protuberance with the injection moulding manufactured with pressing mold with recess and protuberance from the viewpoint of cost.In the time of on will being formed on, can will be formed on this resin bed such as recesses such as track record and protuberance by the resin bed of making such as radiation-hardenable resins such as light-cured resins by the base material of making such as glass etc.

(i) about cushion 28

Herein, cushion 28 is arranged between the transparent adhesive layer 24 and second recording layer 25 as the middle layer.

Cushion 28 can stop and two-layerly dissolves each other and stop two-layer being mixed with each other.Cushion 28 also has other function except that stoping dissolution phenomena.In addition, can dispose another middle layer as required.

The material requirements of cushion 28 is not dissolved each other with second recording layer 25 or transparent adhesive layer 24, and has light transmission to a certain degree.Known inorganic or organic material can be used for cushion 28.Consider from the angle of performance, preferably use inorganic material.For example, (a) metal or semiconductor, (b) metal or semi-conductive oxide, nitride, sulfide, trisulfide, fluoride or carbonide and (c) agraphitic carbon etc. all can use.Wherein, by the layer that almost transparent dielectric material constitutes, or extremely thin metal level (comprising alloy) is preferred.

Particularly, such as oxides such as monox, particularly silicon dioxide, zinc paste, cerium oxide, yttria; Such as zinc sulphide, yttrium sulfide sulfides; Such as nitride such as silicon nitrides; Silit; The potpourri (trisulfide) that oxide and sulphur form; And the alloy that hereinafter will describe all is preferred.The weight ratio of monox and silicon sulfide is about 30: 70～and 90: 10 potpourri is preferred.Potpourri (the Y that sulphur, yttrium dioxide and zinc paste form ₂O ₂S-ZnO) also be preferred.

As metal or alloy, silver or argentiferous are preferred as principal ingredient and the alloy that contains at least a element that is selected from titanium, zinc, copper, palladium and gold of 0.1 atom %～15 atom %.Argentiferous also is preferred as principal ingredient and the alloy that contains at least a rare earth element of 0.1 atom %～15 atom %.As rare earth element, neodymium, praseodymium or cerium etc. are preferred.

In addition, can use any resin bed, as long as when making cushion, do not dissolve the dyestuff in the recording layer.Particularly, can be useful with the polymer film of vacuum evaporation or CVD (chemical vapor deposition) manufactured.

The thickness of cushion 28 is preferably greater than or equals 2nm, more preferably greater than or equal 5nm.When cushion 28 is crossed when thin, the prevention of above-mentioned mixing phenomena is easy to deficiency.The thickness of cushion 28 preferably is less than or equal to 2000nn, is more preferably less than or equals 500nm.Blocked up cushion not only is unnecessary but also can causes the decline of light transmission preventing to mix.When this layer is when being made of inorganics, the film deposition of this layer will spend the longer time, and this can cause productive decline, or the increase of membrane stress.Therefore, thickness preferably is less than or equal to 200nm.Particularly, because the film that is made of metal can excessively damage transmittance, so thickness preferably is less than or equal to about 20nm.

Another cushion can be used as the middle layer and is arranged on for example between the translucent reflective layer 23 and transparent adhesive layer 24.

(j) about other layers

In this stepped construction, another layer can be arranged in each layer arbitrarily as required.Alternatively, another layer can be set arbitrarily on the outermost surface of medium.

Particularly, can provide protective seam with protection recording layer or reflection horizon.Material to protective seam is not done concrete qualification, and any material all can use, as long as it can protect recording layer or reflection horizon to avoid external force.As the organic material of protective seam, thermoplastic resin, thermoset resin, electronic beam curing resin, uv curing resin etc. all can use.As the inorganic material of protective seam, monox, silicon nitride, MgF ₂And SnO ₂Deng all using.

Can be by thermoplastic resin or thermoset resin etc. being dissolved in the suitable solvent with the preparation coating liquid, using this liquid and dry this liquid forms protective seam.In the situation of uv curing resin, coating liquid that can be by preparation uv curing resin itself or prepare by uv curing resin being dissolved in the coating liquid that obtains in the suitable solvent, using this coating liquid and shine the UV line and form protective seam to solidify this liquid.As uv curing resin, all can use such as acryl resins such as urethane acrylate, epoxy acrylate and polyester acrylates.These materials can use or mix use separately.In addition, individual layer and multilayer all can be used.

Method as forming protective seam comprises such as coating processes such as rotary coating, cast, sputter, chemical vaporization etc.Wherein, preferred rotary coating.

The thickness of protective seam is generally 0.1 μ m～100 μ m.In optical recording media of the present invention, the thickness of protective seam is preferably 1 μ m～50 μ m.

In addition, as required, the printing receiving layer can be arranged on the surface except record/read beam incident surface, can be on this printing receiving layer with writing (printing) such as various printing machines such as ink-jet printer, heat seeking printing machine or various writing implement.

Can in this structure, add another recording layer to realize having the structure of three or three above recording layers.Also two optical recording medias with this structure can be carried out as the outside with first base material 21 of medium bonding, thereby the more jumbo medium with four recording layers is provided.

Aforesaid have two single face incident type optical recording medias that contain dye recording layer 22 and 25 and have first of close light beam light incident side (in a side) and contain dye recording layer 22 and contain dye recording layer 25 away from second of this light beam light incident side.Given this, contain dye recording layer 25 recorded informations or therefrom read information and can be undertaken being arranged in by containing dye recording layer 22 illumination beams through first away from second of the position of light beam light incident side.

In this single face incident type optical recording media, when as common optical recording media, be formed on the groove (gathering sill on second base material 27 of opposition side of light beam light incident side, recess) 32 the degree of depth, for example, when being about 150nm, there is such possibility, promptly can't obtains to contain and carry out recording of information on the dye recording layer 25 or read necessary reflectivity second.

In the optical recording media of this embodiment, different with the degree of depth of the common groove that contains the dyestuff optical recording media, the degree of depth of the groove 32 on second base material 27 shoals in the specific region, so that make the change of shape in reflection horizon of reflection groove shapes less.Thus, can obtain enough reflectivity carries out recording of information or reads to contain second on the dye recording layer 25.Should enough big reflectivity be favourable for the compatibility with DVD-ROM is provided easily.During shallow grooves on allowing second base material 27, the productivity with second base material 27 of gathering sill is improved, and has improved batch process thus.

Different with known common dyestuff optical recording media, the degree of depth of the groove 32 on second base material 27 in the specific region shoals, and is enough to contain the reflectivity that carries out recording of information or read on the dye recording layer 25 second so that can obtain.Thus, can use second to contain the film section 25B of dye recording layer 25 or the 25A of thick film portion as track record.That is, can be with the piston ring land (protuberance) of beam emissions (irradiation) to second base material 27, promptly on the recess of second recording layer 25 (film section 25B), with record or read information.In addition, light beam can be launched (irradiation) groove (recess) to second base material 27, that is, and and on the protuberance of second recording layer 25 (25A of thick film portion), with record or read information.

In the optical recording media of this embodiment, the degree of depth of the groove 32 on second base material 27 is set as follows especially.

The degree of depth (depth of groove) of the groove 32 on preferred second base material 27 is more than or equal to 1/100 * λ, and wherein λ represents record/read wavelength.More preferably this degree of depth is more than or equal to 2/100 * λ, further 3/100 * λ more preferably, this be because the degree of depth of preferred this degree to guarantee the go forward side by side rail that follows of line stabilization of enough reflectivity.

For example, when record/read wavelength was λ=650nm, the degree of depth of the groove 32 on second base material 27 was preferably greater than or equals 7nm, more preferably greater than or equal 13nm, further more preferably greater than or equal 20nm.

The degree of depth of the groove 32 on second base material 27 preferably is less than or equal to 1/6 * λ, be more preferably less than or equal 1/8 * λ, further be more preferably less than or equal 1/10 * λ, this is because thereby the preferred not excessive degree of depth is guaranteed reflection light quantity with the variation that reduces the reflection horizon shape, and obtains high reflectance.

When record/read wavelength was λ=650nm, the degree of depth of the groove 32 on second base material 27 preferably was less than or equal to 108nm, was more preferably less than or equaled 81nm, further was more preferably less than or equaled 65nm.

The width of the groove 32 on second base material 27 (recess width, G is wide; Half-breadth) be preferably greater than or equal 1/10 * T, wherein T represents track space, more preferably greater than or equal 2/10 * T, further more preferably greater than or equal 3/10 * T, this is simply to follow the rail difficulty that becomes because narrow recess width is tended to make.

For example, when track space was 740nm, the width of the groove 32 on second base material 27 was preferably greater than or equals 74nm, more preferably greater than or equal 148nm, further more preferably greater than or equal 222nm.

The width of the groove 32 on second base material 27 preferably is less than or equal to 9/10 * T, is more preferably less than or equals 8/10 * T, further is more preferably less than or equals 7/10 * T, and this is simply to follow rail and the good record difficulty that becomes because wide groove tends to make.

For example, when track space was 740nm, the width of the groove 32 on second base material 27 preferably was less than or equal to 666nm, was more preferably less than or equaled 592nm, further was more preferably less than or equaled 518nm.

As mentioned above, according to this embodiment, the degree of depth of the groove 32 on second base material 27 is less than the degree of depth of the groove of common dyestuff optical recording media.The degree of depth of the groove 32 on preferred second base material 27 is less than the degree of depth of the groove 31 on first base material 21.

For example, when record/read wavelength is 650nm, preferably the degree of depth of the groove 32 on second base material 27 is set at and is less than or equal to 65nm and the degree of depth of the groove 31 on first base material 21 is set at more than or equal to 108nm.The combination of noting first base material 21 to be set and the depth of groove on second base material 27 is not limited to above-mentioned example.Unique necessity be the degree of depth of the degree of depth of the groove 32 on second base material 27 less than the groove 31 on first base material 21.

Usually the degree of depth of the groove 32 on preferred second base material 27 is less than the degree of depth of the groove 31 on first base material 21.Particularly, the degree of depth of the groove 32 on preferred second base material 27 be less than or equal to the groove 31 on first base material 21 the degree of depth 90%, be more preferably less than or equal 80%, further be more preferably less than or equal 70%.The degree of depth of the groove 32 on second base material 27 is usually more than or equal to 5% of the degree of depth of the groove 31 on first base material 21, is preferably greater than or equals 10%.

In aforesaid single face incident type optical recording media, when track record is formed on first when containing in the recess (22A of thick film portion) of dye recording layer 22, can obtain excellent record/read characteristic.On the contrary, when track record is formed on second when containing in the recess (25A of thick film portion) of dye recording layer 25, then exist to obtain more excellent record/the read possibility of characteristic (for example, reflectivity, polarity, maximum signal amplitude etc.).

Comprise that first of 22A of thick film portion and film section 22B contains dye recording layer 22 and comprise that second of 25A of thick film portion and film section 25B contains in the optical recording media of dye recording layer 25 having of this embodiment, track record is formed near first of light beam light incident side (in a side) and contains among the 22A of thick film portion of dye recording layer 22, simultaneously track record is formed on away from second of light beam light incident side and contains among the film section 25B of dye recording layer 25, can obtain more excellent record/read characteristic thus.

When second contains the enterprising line item of film section 25B of dye recording layer 25, can access more excellent record/read the reason of characteristic, be the influence that is subjected to the following fact according to inferring.

In order to follow rail writing down well or to read on track record, the phase differential between recess when illumination beam (the non-rail part of following) and protuberance (following the rail part) (optical path length poor) is important.

In first recording layer 22, equal the poor of optical path length in the folded light beam at the interface at recess place with from the difference of above-mentioned interlayer between the folded light beam at the interface at protuberance place from 23 of first recording layer 22 and translucent reflective layer.The difference of optical path length is mainly determined by following factor: between the surface of the recess of first recording layer 22 of light beam light incident side and protuberance apart from poor, the complex index of refraction of first recording layer 22 of the recess of d1 (distance between the surface of the surface of the film section 22B of first recording layer 22 of the first base material side and the 22A of its thick film portion) (with reference to figure 1), first recording layer 22 and the thickness between protuberance and the complex index of refraction of first base material 21.

On the other hand, in second recording layer 25, equal the poor of optical path length from the folded light beam at the interface at 26 recess places of second recording layer 25 and reflection horizon with from the difference between the folded light beam at the interface at above-mentioned interlayer protuberance place.The difference of optical path length is mainly determined by following factor: between the surface of the recess of second recording layer 25 of light beam light incident side and protuberance apart from the distance of d2[between the surface of the surperficial and 25A of its thick film portion of the film section 25B of second recording layer 25 of transparent adhesive layer side (middle layer side)] poor, the complex index of refraction of second recording layer 25 of the recess of (with reference to figure 1), second recording layer 25 and the thickness between protuberance and the complex index of refraction of transparent adhesive layer 24.

In this case, d2 must be different from d1.That is, owing to groove is filled to a certain degree and under this state, forms from the teeth outwards irregular body by being coated with recording layer thereon, so d2 is significantly less than d1.

Given this, the difference of optical path length and phase differential show successively with first recording layer 22 in different behaviors.Owing to this reason, in second recording layer 25, more preferably in film section 25B, carry out record according to inferring.

In order in the film section 25B of second recording layer 25, to form track record, must guarantee the function of necessary thickness with the film section 25B performance recording layer that allows second recording layer 25.That is, the film section 25B of preferred second recording layer 25 has more than or equal to predetermined thickness (for example, thickness 70nm) (L thickness).For example, when second recording layer 25 formed by be coated with the solvent that contains dyestuff with rotary coating, by changing concentration or the revolution as the dyestuff of recording layer coating condition, the thickness that can make second recording layer 25 was more than or equal to predetermined thickness.

The 25A of thick film portion of second recording layer 25 and the film thickness difference between the film section 25B are preferably greater than or equal 1/100 * λ/n, wherein λ represents record/read wavelength, n represents the refractive index of second recording layer 25, described film thickness difference more preferably greater than or equal 2/100 * λ/n, further more preferably greater than or equal 3/100 * λ/n.

Described film thickness difference preferably is less than or equal to 1/3 * λ/n, is more preferably less than or equals 1/4 * λ/n, further is more preferably less than or equals 1/5 * λ/n.

In practice, when record/read wavelength is that the refractive index of the λ=650nm and second recording layer 25 is when being n=2.2, the 25A of thick film portion of second recording layer 25 and the film thickness difference between film section 25B are preferably greater than or equal 3nm, more preferably greater than or equal 6nm, further more preferably greater than or equal 9nm.This film thickness difference preferably is less than or equal to 98nm, is more preferably less than or equals 74nm, further is more preferably less than or equals 59nm.

On the other hand, the 22A of thick film portion of first recording layer 22 and the film thickness difference between the film section 22B be preferably greater than or equal 1/30 * (λ/n), wherein λ represents record/read wavelength, n represents the refractive index of first recording layer, more preferably greater than or equal 2/30 * (λ/n), further more preferably greater than or equal 3/30 * (λ/n).

This film thickness difference preferably is less than or equal to 4/4 * (λ/n), be more preferably less than or equal 4/5 * (λ/n), further be more preferably less than or equal 4/6 * (λ/n).

In practice, when record/the read refractive index n that wavelength is the λ=650nm and first recording layer 22=2.2, the 22A of thick film portion of first recording layer 22 and the film thickness difference between film section 22B are preferably greater than or equal 10nm, more preferably greater than or equal 20nm, further more preferably greater than or equal 30nm.This film thickness difference preferably is less than or equal to 295nm, is more preferably less than or equals 236nm, further is more preferably less than or equals 197nm.

In this embodiment, owing to the recess on first base material 21 of the 22A of thick film portion of first recording layer 22 and film section 22B and light beam light incident side with protuberance is corresponding forms, therefore preferred track record is formed in the groove (recess) on first base material 21, that is, in the protuberance (22A of thick film portion) of the first outstanding recording layer 22 of light beam light incident side.

In this case, in this optical recording media, recording of information or to read be by with the groove (recess) of beam emissions (irradiation) to first base material 21, that is, and the protuberance of first recording layer 22 (22A of thick film portion) and carrying out.

In this embodiment, owing to the recess on second base material 27 of the 25A of thick film portion of second recording layer 25 and the opposition side of film section 25B and light beam light incident side with protuberance is corresponding forms, therefore preferred track record is formed in the piston ring land (protuberance) on second base material 27, that is, in the protuberance (film section 25B) of the second outstanding recording layer 25 of light beam light incident side.

In this case, in this optical recording media, recording of information or to read be by with the piston ring land (protuberance) of beam emissions (irradiation) to second base material 27, that is, and the protuberance of second recording layer 25 (film section 25B) and carrying out.

In optical recording media of the present invention, track record can form in the groove on first base material 21, and track record can form on the piston ring land on second base material 27 simultaneously.In this case, when writing down in recording layer or therefrom reading information, the polarity that changes track may be necessary.

According to this embodiment, the degree of depth of the groove 32 on second base material 27 is set at the degree of depth less than the groove of known dyestuff optical recording media, or track record is formed on away from second of light beam light incident side contains among the film section 25B of dye recording layer 25, improved the second information record that contains dye recording layer 25/read characteristic thus.More preferably aforesaid way is made up, contain in the film section 25B of dye recording layer 25 so that can set the degree of depth of the groove 32 on second base material 27 more shallow and track record is formed on second.

Thus, can stably obtain to be enough to be used in containing dye recording layer 25, writing down or therefrom reading the reflectivity of information, and more excellent recording characteristic.

(2) manufacture method of optical recording media

Below, will the manufacture method of optical recording media with said structure be described.

At first, be manufactured on and have first recording layer 22 that contains dyestuff and the laminate structure (first information record body) of translucent reflective layer 23 on the first transparent base material 21 successively.On the other hand, be manufactured on second base material 27 and have reflection horizon 26 successively, contain second recording layer 25 of dyestuff and the laminate structure (second authenticable information recording) of cushion 28.The first information is write down body and second authenticable information recording is bonded together in the mode that recording layer faces with each other across transparent adhesive layer 24.

In practice, be formed with groove, piston ring land and pre-pit the first transparent base material 21 on the surface as recess and protuberance, make with injection moulding or 2P method etc. (with resin moulding-die recess and protuberance are transferred to such as curable resins such as light-cured resins, and solidify this resin) to make the method for base material with recess and protuberance.

Next, be dissolved in the solvent to major general's organic dyestuff, be deposited on methods such as rotary coating on the surface with recess and protuberance of first base material 21 to form first recording layer 22.

On first recording layer 22, sputter or evaporation Ag alloy etc. are made first information record body thus with deposition translucent reflective layer 23.

Next, with being formed with groove, piston ring land and pre-pit second base material 27 on the method manufacturing surfaces such as injection moulding or 2P method as recess and protuberance.With sputters such as Ag alloy or evaporation on the surface of second base material 27 with recess and protuberance with deposition of reflective rete 26.

In addition, be dissolved in the solvent to major general's organic dyestuff, deposit to form second recording layer 25 with rotary coating etc.

Next, sputters such as dielectric material with deposition cushion 28, are made second authenticable information recording thus.

Bonding agents such as uv curing resin are coated on the first information record body, second authenticable information recording is mounted thereto, for example, make bonding agent spread all over its whole surface by high speed rotating or pressurization again.In governing speed or pressure, carry out this step so that the thickness of bonding coat in preset range.

Afterwards, ultraviolet ray is shone with bonding agents such as curing uv curing resins through translucent reflective layer 23 from first information record side, thereby these two record bodies are bonded together, make optical recording media thus.

In addition, ultraviolet ray can be shone from side medium.In any situation, must carefully not make the ultraviolet radiation damage dye recording layer.Can use the pressure sensitive double sticky tape, this adhesive tape is placed between the first information record body and second authenticable information recording, it is pressurizeed to form bonding coat.In addition, bonding coat also can form by the following method: use to postpone curing adhesive, this bonding agent is coated on the first information record body irradiation ultraviolet radiation on this bonding agent with serigraphy etc., second authenticable information recording is installed on the first information record body, and it is pressurizeed.Usually, many delay curing adhesives are opaque.

Below, will be described base material 21 with gathering sill (recess and protuberance) and 27 manufacture method.

For example, in order on base material 21 and 27, to form recess and protuberance (groove), can use metal stamping and pressing, and recess and protuberance are transferred on the resin material to make first base material 21 with injection moulding with required recess and protuberance.Use has another pressing mold of opposite recess and protuberance, with injection moulding recess and protuberance is transferred on the resin material to make second base material 27.

For example, especially swing is formed on the track record so that synchronizing information and address information etc. to be provided thereon.

In this embodiment, because track record is formed among the 22A of thick film portion of first recording layer 22, track record is formed among the film section 25B of second recording layer 25 simultaneously, and therefore swing is formed on recess on first base material 21 and neutralizes in the protuberance of second base material 27.

In following operation, swing is formed in the recess on first base material 21.

At first, when light beam being crawled advance, glass baseplate/photoresist is exposed and develop to obtain to have the egative film of recess and protuberance.On the egative film with recess and protuberance, swing is formed in the recess (groove) usually.

Pressing mold is made with the egative film with recess and protuberance.With the pressing mold of manufacturing, has first base material 21 of recess and protuberance (groove, gathering sill) with injection moulding manufacturing.In this case, because swing is formed on the protuberance of pressing mold, therefore make swing in the recess on first base material 21.

In order to form the swing on the protuberance on second base material 27, swing is present on the recess of pressing mold.Given this, said method can't provide swing for the protuberance on second base material 27.

Therefore, use the manufacture method identical to make pressing mold with the pressing mold that is used on first base material 21 forming recess and protuberance (groove, gathering sill).Herein, the shape (depth of groove, recess width, the amplitude etc. of crawling) that must change recess and protuberance is complementary itself and the recess and the protuberance that will form on second base material 27.

Next, the negative pressure mould that has opposite recess and protuberance by this pressing mold transfer printing recess and protuberance with manufacturing.In this case, because swing is formed on the protuberance of pressing mold, therefore swing is formed in the negative pressure mould recess.

With described negative pressure mould, has second base material 27 of recess and protuberance (groove, gathering sill) with injection moulding manufacturing.In this case, because swing is formed on the recess of negative pressure mould, therefore on the protuberance of second base material 27, form swing.

(3) record/read method of optical recording media

Below, will the record/read method of the optical recording media of this embodiment be described.

The record that has in the optical recording media of said structure carries out to recording layer by the laser beam irradiation that will focus to diameter from the first base material side and be about 0.5 μ m～1 μ m.In the part of being shone by laser beam, the thermal deformation such as recording layers such as decomposition, heating or dissolvings that causes because of the energy that absorbs laser beam takes place, thereby changed the optical characteristics of recording layer.

Reading by the differing from of reflectivity of reading with laser beam between the zone that zone that optical characteristics changed and optical characteristics do not change of institute's recorded information undertaken.

Write down and read on two recording layers and carry out in the following manner separately.For the focal position of focussed laser beam, can be on first recording layer 22 or on second recording layer 25 by distinguishing this focal position with resulting focus error signals of method such as knife-edge method, method of astigmatism, Foucault methods.That is, when the object lens that are used for focussed laser beam were mobile in vertical direction, different sigmoid curves can be to obtain on first recording layer 22 or on second recording layer 25 according to the focal position of laser beam.Can be by first recording layer 22 or second recording layer 25 of selecting arbitrary sigmoid curve to select institute to write down or read.

In this embodiment, when recorded information in first recording layer 22 or when therefrom reading information, preferably with the groove (recess) of beam emissions (irradiation) to first base material 21, promptly, on the protuberance of first recording layer 22 (22A of thick film portion), to write down or to read information.When recorded information in second recording layer 25 or when therefrom reading information, preferably with the piston ring land (protuberance) of beam emissions (irradiation) to second base material 27, that is, and on the protuberance of second recording layer 25 (film section 25B), with record or read information.

As the laser beam of the optical recording media that is used for this embodiment, N ₂Laser instrument, He-Cd laser instrument, Ar laser instrument, He-Ne laser instrument, ruby laser, semiconductor laser, dye laser etc. all can use.Wherein, because it is in light weight, small-sized, easy etc., the preferred semiconductor laser instrument.

For high density recording, the wavelength of preferred employed laser beam is short as far as possible.Particularly, optimal wavelength is the laser beam of 350nm～530nm.As the exemplary of this laser beam, comprise that centre wavelength is the laser beam of 405nm, 410nm and 515nm.For example, wavelength coverage is that the laser beam of 350nm～530nm can be by obtaining with the blue high-power semiconductor laser of 405nm or 410nm or the blue-green high-power semiconductor laser of 515nm.In addition, laser beam can obtain by by second harmonic generator (SHG) following laser being carried out wavelength-modulated: the semiconductor laser of wavelength of fundamental oscillation that (a) can continuous oscillation 740nm～960nm, or (b) excite with semiconductor laser and the solid-state laser of wavelength of fundamental oscillation that can continuous oscillation 740nm～960nm.

As above-mentioned SHG, any do not have the symmetric piezoelectric element of counter-rotating and all can use, but preferred KDP (potassium dihydrogen phosphate), ADP (ammonium dihydrogen phosphate (ADP)), BNN (barium sodium niobate (BNN)), KN (potassium niobate), LBO (three lithium borates) and compound semiconductor.Concrete instance as second harmonic, be included in use wavelength of fundamental oscillation as in the situation of the semiconductor laser of 860nm as the 430nm of times ripple of 860nm, in the situation of using the solid-state laser that excites by semiconductor laser as from Cr Li doped SrAlF ₆The 430nm of times ripple of the 860nm of crystal (wavelength of fundamental oscillation is 860nm), or the like.

(4) effect/effect

According to this optical recording media of this embodiment, the manufacture method of this optical recording media and the record/read method of this optical recording media, by writing down or read the optical recording media of a plurality of recording layers 22 of having of information and 25, make laser beam irradiation go up with record or read information to film section 25B away from second recording layer 25 of laser beam incident side from one side illuminating laser beam.Therefore when on second recording layer 25, carry out recording of information or read, can obtain the record of enough reflectivity and excellence/read characteristic (for example, reflectivity, polarity, maximum signal amplitude, or the like) away from the laser beam incident side.As a result, You Yi record/read characteristic on a plurality of recording layers 22 and 25, all can obtain.

(5) other

In the present embodiment, apply the present invention to the single face incident type DVD-R of bonding double deck type.Yet the present invention is not limited to this.The present invention can be applied to the optical recording media of any structure, if its have by carry out from one side illuminating laser beam recording of information or read contain dye recording layer.

As shown in Figure 2, can apply the present invention to the single face incident type DVD-R of stacked double deck type, the single face incident type DVD-R of the double deck type that this is stacked has first recording layer (first contains dye recording layer) 2, translucent reflection horizon (translucent reflective layer) 3, the middle resin layer (middle layer) 4 that contains dyestuff, second recording layer (second contains dye recording layer) 5 that contains dyestuff, reflection horizon 6, second base material 7,8 (being made of bonding coat 7 and matrix 8) successively on plate-like transparent (light transmission) first base material (the first light transmission base material) 1.Incidentally, Reference numeral 11 and 12 is meant gathering sill (groove, recess).

In this case, being arranged in away from second recording layer, 5 recorded informations of laser beam incident side or the information that therefrom reads is to carry out with the gathering sill (groove, recess) 12 that is formed on second base material 7,8 (being positioned at the base material of a side opposite with the laser beam incident side).For obtaining enough reflectivity, the degree of depth of gathering sill 12 is in the scope of 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

In order to obtain excellent record/read characteristic, preferably the groove (groove, recess) 12 on second base material 7,8 promptly, forms track record in the recess of second recording layer 5 (film section).That is, preferably with the groove (groove, recess) 12 of laser beam emission (irradiation) to second base material 7,8, that is, the recess of second recording layer 5 (film section) is gone up to write down or to read information.

When applying the present invention to the single face incident type optical recording media of bonding double deck type, the present invention is effective especially and preferred.Promptly, the optical recording media that applies the present invention to have the first information record body and second authenticable information recording is effective, described first information record body has first of first dyestuff that contains that stacks gradually at least having on first base material of gathering sill and contains dye recording layer and translucent reflective layer, described second authenticable information recording has to stack gradually at least and has the reflection horizon on second base material of gathering sill and containing second of second dyestuff and contain dye recording layer, described optical recording media is by being bonded together described first information record body and described second authenticable information recording across the optical transparence bonding coat, the opposing face of the base material of the base material of described first information record body and described second authenticable information recording is formed toward each other, wherein by writing down or read information from the first base material side illumination beam.

Owing in this optical recording media, two authenticable information recordings are bonded together, make opposing face toward each other, therefore between two authenticable information recordings, tend to different with the difference of the optical path length between the state that contains dye recording layer filling groove or groove and piston ring land.Given this, the optimum depth that it is believed that the groove on second base material is different from the optimum depth on first base material, and the degree of depth of the second base material upper groove can draw optimum value during less than the degree of depth of the groove on first base material.

The present invention not only can be applied to so-called base material incident type optical recording media, and can be applied to so-called film incident type optical recording media.Promptly; the present invention can be applied to have matrix (comprising protective seam, base material etc.), contain dye recording layer, reflection horizon and have the optical recording media (having the single optical recording media that contains dye recording layer) of the base material of gathering sill, wherein by writing down or read information from matrix side (opposition side of base material) illumination beam.

In this case, for from being formed on the gathering sill (groove on the base material (being positioned at the base material of a side opposite) with the light beam light incident side, recess) obtain enough reflectivity, the degree of depth of base material upper groove is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

Thus, when by from the opposition side illumination beam of base material and when containing the dye recording layer recorded information or therefrom reading information, can obtain enough reflectivity.As a result, can obtain excellent record/read characteristic.

Notice that the present invention is not limited to above-mentioned embodiment, can not improve in various manners but do not depart from the scope of the present invention.

Embodiment

Below, will further describe in detail the present invention by embodiment.Notice that the present invention is not limited to following embodiment.

(preparation of optical recording media)

Optical recording media in embodiment and the comparative example has the first information record body and second authenticable information recording, described first information record body has first of first dyestuff that contains that stacks gradually having on first base material of gathering sill at least and contains dye recording layer and translucent reflective layer, described second authenticable information recording has at least to stack gradually and has the reflection horizon on second base material 2 of gathering sill and containing second of second dyestuff and contain dye recording layer, described optical recording media is by being bonded together described first information record body and described second authenticable information recording across the optical transparence bonding coat, the opposing face of the base material of the base material of described first information record body and described second authenticable information recording is formed toward each other.

Below, will the preparation of second authenticable information recording be described mainly.

At first, use second base material (refractive index be 1.56) by polycarbonate made of female pressing mold (negative pressure mould) preparation thickness as 0.6mm with injection moulding, its track space is 740nm and has predetermined depth and the gathering sill of preset width.

Next, the content of the Ag silver alloy more than or equal to 97 atom % is sputtered on second base material to form the reflection horizon.

On the reflection horizon, the octafluoropentanol solution of metal complex azo dyes is rotated coating under predetermined coating condition (dye strength), under 100 ℃ temperature, contained dye recording layer to form second in dry 30 minutes.Change the coating condition so that second contain dye recording layer and have predetermined thickness herein.The refractive index of this recording layer is that 2.25 Bees Waxs are 0.02.

Contain on the dye recording layer second, use silver alloy, (ZnS) of the content of Ag more than or equal to 97 atom % ₈₀(SiO ₂) ₂₀Or SiO ₂In anyly carry out sputter to form cushion, thereon with uv curing resin (SPC-920, Japanese chemical drug manufacturing) rotary coating to the thickness of about 5 μ m～7 μ m to form protective seam.

Normally; with rotary coating free radical type uv curing resin (bonding agent) is coated on the above-mentioned protective seam; bonding with first base material that contains recording layer (first recording layer) of independent preparation, the reflection horizon that makes this layer and first base material toward each other, with the preparation optical recording media.

Herein, in order to eliminate the characteristic that the first information writes down the influence of body and accurately assesses second recording layer, be that the no groove polycarbonate substrate that does not have recording layer and translucent reflective layer (refractive index is 1.56) of 0.6mm writes down body as the first information with thickness.The refractive index of bonding coat is 1.53 after solidifying.

(assay method)

At first, the reflectivity of Unrecorded second recording layer is that the assessment machine of the semiconductor laser of 657nm (NA=0.65) (the dominant record power that Pulstec Industrial Co., Ltd make is the DDU-1000 of 15mW) is measured with being equipped with wavelength.Next, the EFM that in 8/16 modulation, is modulated ⁺Signal with the transition linear velocity of 3.8m/s (1 times of speed), be approximately zero recording power with the asymmetry of tracer signal and carry out record, and the polarity and maximum signal amplitude (the longest mark amplitude of measurement of reflectivity, this tracer signal; So-called modulation; I14/I14H).

In these embodiments, it is believed that the reflectivity more than or equal to 25% is excellent, 30% reflectivity is excellent more.In order to keep the compatibility with DVD-ROM, the reflectivity at the non-recorded part tens percent of second recording layer is enough usually.Because medium does not in these embodiments have first recording layer and translucent reflective layer, therefore might be higher than concrete instance by reflectivity.When having obtained in these embodiments,, also can obtain tens percent reflectivity even it is believed that the actual influence of considering first information record body more than or equal to 25% reflectivity.

For with compatibility such as DVD-ROM, the polarity of preferred tracer signal is H to L.

Usually preferred maximum signal amplitude is bigger.Maximum signal amplitude is preferably greater than usually or equals 0.5, more preferably greater than or equal 0.6.Yet the thickness by regulating recording layer, groove shapes, recording power, recording impulse waveform (Write strategy) etc. can improve maximum signal amplitude.Given this, though when the value of maximum signal amplitude hour, as long as reflectivity is enough, this medium just can be used as optical recording media.For example, by in tracer signal under the high recording power increasing the width of the record mark on the orbital direction, thereby can increase maximum signal amplitude.

The measurement result of the reflectivity in embodiment and the comparative example, polarity, maximum signal amplitude is shown in the table 1 of below.

In order to be λ=657nm at record/read wavelength, satisfy the relation that depth of groove is 1/100 * λ～1/6 * λ, need depth of groove in the scope of 6.57nm～109.5nm.

Table 1

	Recording portion	Depth of groove (nm)	L wide (nm)	G wide (nm)	L thickness (nm)	G thickness (nm)	Cushion	Reflectivity	Polarity	Maximum signal amplitude	Recording layer coating condition (dye strength; Weight %)
												Embodiment 1	G	65	420	320	70	85	The Ag alloy	30.7	H to L	＜0.1	3.55 weight %
Embodiment 2	L	65	420	320	70	85	The Ag alloy	40.0	H to L	0.79	3.55 weight %
												Embodiment 3	L	65	420	320	70	85	SiO 2	28.1	-	-	3.55 weight %
Embodiment 4	L	65	420	320	80	100	The Ag alloy	27.4	-	-	4.43 weight %
												Embodiment 5	L	65	420	320	80	100	ZnS-SiO 2	26.7	-	-	4.43 weight %
Embodiment 6	L	65	420	320	80	100	SiO 2	29.7	-	-	4.43 weight %
												Embodiment 7	G	50	330	410	75	105	The Ag alloy	40.1	-	-	3.55 weight %
Embodiment 8	G	50	330	410	75	105	SiO 2	30.9	H to L	0.36	3.55 weight %
												Embodiment 9	G	50	330	410	95	130	The Ag alloy	29.1	H to L	LS	4.43 weight %
Embodiment 10	G	50	330	410	95	130	ZnS-SiO 2	31.3	H to L	0.31	4.43 weight %
												Embodiment 11	G	50	330	410	95	130	SiO 2	31.2	H to L	0.3	4.43 weight %
Embodiment 12	L	50	330	410	75	105	The Ag alloy	45.3	-	-	3.55 weight %
												Embodiment 13	L	50	330	410	75	105	ZnS-SiO 2	29.0	-	-	3.55 weight %
Embodiment 14	L	50	330	410	75	105	SiO 2	36.4	H to L	0.74	3.55 weight %
												Embodiment 15	L	50	330	410	95	130	The Ag alloy	31.1	H to L	0.71	4.43 weight %
Embodiment 16	L	50	330	410	95	130	ZnS-SiO 2	38.2	H to L	0.66	4.43 weight %
												Embodiment 17	L	50	330	410	95	130	SiO 2	36.1	H to L	0.73	4.43 weight %
Embodiment 18	G	30	520	220	70	110	The Ag alloy	43.0	-	-	3.10 weight %
												Embodiment 19	G	30	520	220	70	110	ZnS-SiO 2	39.0	H to L	0.22	3.10 weight %
Embodiment 20	G	30	520	220	70	110	SiO 2	43.2	H to L	0.11	3.10 weight %
												Embodiment 21	G	30	520	220	90	135	The Ag alloy	30.2	H to L	＜0.1	3.55 weight %
Embodiment 22	G	30	520	220	90	135	ZnS-SiO 2	41.7	-	-	3.55 weight %
												Embodiment 23	G	30	520	220	90	135	SiO 2	38.9	H to L	0.17	3.55 weight %
Embodiment 24	L	30	520	220	70	110	The Ag alloy	49.1	-	-	3.10 weight %
												Embodiment 25	L	30	520	220	70	110	ZnS-SiO 2	43.9	H to L	0.72	3.10 weight %
Embodiment 26	L	30	520	220	70	110	SiO 2	49.5	H to L	0.58	3.10 weight %
												Embodiment 27	L	30	520	220	90	135	The Ag alloy	33.9	H to L	0.79	3.55 weight %
Embodiment 28	L	30	520	220	90	135	ZnS-SiO 2	47.9	-	-	3.55 weight %
												Embodiment 29	L	30	520	220	90	135	SiO 2	44.2	H to L	0.55	3.55 weight %
												Comparative example 1	G	120	410	330	30	70	The Ag alloy	9.0	-	-	1.90 weight %
Comparative example 2	G	120	410	330	30	70	SiO 2	6.5	-	-	1.90 weight %
												Comparative example 3	G	160	430	310	20	75	The Ag alloy	12.9	-	-	1.90 weight %
Comparative example 4	G	160	430	310	20	75	SiO 2	19.9	-	-	1.90 weight %

Embodiment 1

In embodiment 1, on second base material, the formation depth of groove is that 65nm (being equivalent to about λ/10), recess width (G is wide) are the gathering sill of 420nm for 320nm and land width (L is wide).

Cushion forms by sputter Ag alloy.As the coating condition, use metal complex azo dyes to be rotated coating with the dye strength of 3.55 weight % to form second recording layer.

As above the thickness of the groove part of second recording layer of Xing Chenging (thick film portion, G thickness) is 85nm, and the thickness (film section, L thickness) of piston ring land part is 70nm.

Measure the as above reflectivity of the groove part of the optical recording media of preparation under these conditions.As shown in table 1, this reflectivity is 30.7%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is less than 0.1 (when the recording power with 15nW writes down).Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Embodiment 2

In embodiment 2, above-mentioned condition measure use with the foregoing description 1 in the reflectivity of piston ring land part of optical recording media of identical method preparation.As a result, as shown in table 1, this reflectivity is 40.0%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.79.

As mentioned above, find to be used for record/read necessary reflectivity can in piston ring land record rather than groove record, obtain.

Have now found that,, when as embodiment 2, carrying out the piston ring land record, also can obtain being used for the necessary characteristic of record/read even in the optical recording media of using the method preparation identical with embodiment 1.

Embodiment 3

In embodiment 3, except the material of cushion is SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 2 to measure.This reflectivity is 28.1%, and is as shown in table 1.

Become SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain being used for the necessary reflectivity of record/read.

Embodiment 4

In embodiment 4, reflectivity is measured in the mode identical with the foregoing description 2, difference be as the coating condition dye strength be 4.43%, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 100nm, the thickness (film section, L thickness) of its piston ring land part is 80nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 20nm).As shown in table 1, this reflectivity is 27.4%.

So, change, also can obtain being used for the necessary reflectivity of record/read even have now found that the thickness when second recording layer.

Embodiment 5

In embodiment 5, except the material of cushion is ZnS-SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 4 to measure.As shown in table 1, this reflectivity is 26.7%.

So, become ZnS-SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 6

In embodiment 6, reflectivity uses the mode identical with the foregoing description 3 to measure, difference be as the coating condition dye strength be 4.43%, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 100nm, the thickness (film section, L thickness) of its piston ring land part is 80nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 20nm).As shown in table 1, this reflectivity is 29.7%.

So, change, also can obtain the necessary reflectivity of record/read even have now found that the thickness when second recording layer.

Embodiment 7

In embodiment 7, forming depth of groove on second base material is that 50nm (being equivalent to about λ/13), recess width (G is wide) are the gathering sill of 330nm for 410nm, land width (L is wide).

Sputter Ag alloy is to form cushion.As the coating condition, the rotary coating metal complex azo dyes is to form second recording layer with the dye strength of 3.55 weight %.

So the thickness (thick film portion, G thickness) of the groove part of second recording layer of preparation is 105nm, and the thickness (film section, L thickness) of its piston ring land part is 75nm.

Measure so reflectivity of the groove part of the optical recording media of preparation under these conditions.As shown in table 1, this reflectivity is 40.1%.

So, have now found that with the foregoing description 1 and compare that reflectivity increases along with reducing of the second base material upper groove degree of depth.

Embodiment 8

In embodiment 8, except the material of cushion is SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 7 to measure.As shown in table 1, this reflectivity is 30.9%.

Measure the polarity and the maximum signal amplitude of tracer signal.The polarity of tracer signal is H to L, and its maximum signal amplitude is 0.36.Since maximum signal amplitude can be by regulating recording layer thickness etc. improve, therefore it is believed that such a optical recording media is operable.

So, become SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 9

In embodiment 9, reflectivity uses the mode identical with the foregoing description 7 to measure, difference be as the coating condition dye strength be 4.43%, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 130nm, the thickness (film section, L thickness) of its piston ring land part is 95nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 35nm).As shown in table 1, this reflectivity is 29.1%.

Measure the polarity and the maximum signal amplitude of tracer signal.The polarity of tracer signal is H to L, and its maximum signal amplitude is that LS (because light sensitivity is not good, fails to carry out record; When writing down) with the recording power of 15mW.Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Change even have now found that the thickness when second recording layer, also can obtain the necessary reflectivity of record/read.

Embodiment 10

In embodiment 10, except the material of cushion is ZnS-SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 9 to measure.As shown in table 1, this reflectivity is 31.3%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.31.Yet,, therefore it is believed that such a optical recording media also is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

So, become ZnS-SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 11

In embodiment 11, reflectivity uses the mode identical with the foregoing description 8 to measure, difference be as the coating condition dye strength be 4.43%, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 100nm, the thickness (film section, L thickness) of its piston ring land part is 80nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 20nm).As shown in table 1, this reflectivity is 31.2%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.3.Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Change even have now found that the thickness when second recording layer, also can obtain the necessary reflectivity of record/read.

Embodiment 12

In embodiment 12, measure the reflectivity of the piston ring land part of using the optical recording media that the mode identical with the foregoing description 7 prepare under these conditions.As a result, as shown in table 1, this reflectivity is 45.3%.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Embodiment 13

In embodiment 13, except the material of cushion is ZnS-SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 12 to measure.As shown in table 1, this reflectivity is 29.0%.

Become ZnS-SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 14

In embodiment 14, measure the reflectivity of the piston ring land part use the optical recording media that the mode identical with the foregoing description 8 prepare under these conditions.As a result, as shown in table 1, this reflectivity is 36.4%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.74.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Even find that also the material when cushion is SiO ₂, and the thickness of second recording layer and groove shapes be when changing, and also can obtain excellent record/read characteristic.

When groove record carries out,, also can't obtain being used for the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 8.On the contrary, have now found that when piston ring land record carries out as present embodiment 14, can obtain the necessary characteristic of record/read.

Embodiment 15

In embodiment 15, measured the reflectivity of the piston ring land part of using the optical recording media that the mode identical with the foregoing description 9 prepare under these conditions.As a result, as shown in table 1, this reflectivity is 31.1%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.71.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Even find that also the material when cushion is SiO ₂, and the thickness of second recording layer and groove shapes be when changing, and also can obtain excellent record/read characteristic.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 9.On the contrary, have now found that when piston ring land record carries out as present embodiment 15, can obtain the necessary characteristic of record/read.

Embodiment 16

In embodiment 16, measured the reflectivity of the piston ring land part of using the optical recording media that the mode identical with the foregoing description 10 prepare under these conditions.As a result, as shown in table 1, this reflectivity is 38.2%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.66.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Become ZnS-SiO when the material of cushion by the Ag alloy even also find ₂The time, also can obtain excellent record/read characteristic.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 10.On the contrary, have now found that when piston ring land record carries out as present embodiment 16, can obtain the necessary characteristic of record/read.

Embodiment 17

In embodiment 17, measured the reflectivity of the piston ring land part of using the optical recording media that the mode identical with the foregoing description 11 prepare under these conditions.As a result, as shown in table 1, this reflectivity is 36.1%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.73.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Become SiO when the material of cushion by the Ag alloy even also find ₂The time, also can obtain excellent record/read characteristic.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 11.On the contrary, have now found that when piston ring land record carries out as present embodiment 17, can obtain the necessary characteristic of record/read.

Embodiment 18

In embodiment 18, on second base material, the formation depth of groove is that 30nm (being equivalent to about λ/20), recess width (G is wide) are the gathering sill of 520nm for 220nm and land width (L is wide).

Sputter Ag alloy is to form cushion.As the coating condition, the rotary coating metal complex azo dyes is to form second recording layer with the dye strength of 3.10 weight %.

As above the thickness of the groove part of second recording layer of Xing Chenging (thick film portion, G thickness) is 110nm, and the thickness (film section, L thickness) of piston ring land part is 70nm.

As above the reflectivity of the groove part of Zhi Bei optical recording media is measured under these conditions.As shown in table 1, this reflectivity is 43.0%.

Have now found that with the foregoing description 7 and compare that reflectivity increases along with reducing of the second base material upper groove degree of depth.

Embodiment 19

In embodiment 19, except the material of cushion is ZnS-SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 18 to measure.As shown in table 1, this reflectivity is 39.0%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.22.Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Even have now found that the material of working as cushion is by Ag alloy SiO ₂Become SiO ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 20

In embodiment 20, except the material of cushion is SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 18 to measure.As shown in table 1, this reflectivity is 43.2%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.11.Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Become SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 21

In embodiment 21, reflectivity uses the mode identical with the foregoing description 18 to measure, difference is that dye strength with 3.55 weight % is as the coating condition, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 135nm, the thickness (film section, L thickness) of its piston ring land part is 90nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 45nm).As shown in table 1, this reflectivity is 30.2%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is slightly less than 0.1 (when the recording power with 15mW writes down).Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Change even have now found that the thickness when second recording layer, also can obtain the necessary reflectivity of record/read.

Embodiment 22

In embodiment 22, except the material of cushion is ZnS-SiO ₂In addition, reflectivity uses the mode identical with the foregoing description 21 to measure.As shown in table 1, this reflectivity is 41.7%.

Become ZnS-SiO even have now found that material by the Ag alloy when cushion ₂The time, also can obtain the necessary reflectivity of record/read.

Embodiment 23

In embodiment 23, reflectivity uses the mode identical with the foregoing description 20 to measure, difference is that dye strength with 3.55 weight % is as the coating condition, the thickness of the groove part of second recording layer (thick film portion thus, the G thickness) be 135nm, the thickness (film section, L thickness) of its piston ring land part is 90nm (that is, the film thickness difference between the film section of second recording layer and the thick film portion is 45nm).As shown in table 1, this reflectivity is 38.9%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.17.Yet,, therefore it is believed that such a optical recording media is operable because the thickness that maximum signal amplitude can be by regulating recording layer etc. improve.

Change even have now found that the thickness when second recording layer, also can obtain the necessary reflectivity of record/read.

Embodiment 24

In embodiment 24, measure the reflectivity of the piston ring land part of using the optical recording media for preparing with the foregoing description 18 same way as under these conditions.As shown in table 1, this reflectivity is 49.1%.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Embodiment 25

In embodiment 25, measure the reflectivity of the piston ring land part of using the optical recording media for preparing with the foregoing description 19 same way as under these conditions.As shown in table 1, this reflectivity is 43.9%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.72.

Even have now found that the material of working as cushion is by Ag alloy SiO ₂Become SiO ₂The time, also can obtain excellent record/read characteristic.

Also find using ZnS-SiO ₂When thickness, recess width and the land width of recording layer change, can obtain more excellent record/read characteristic in the situation of cushion.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 19.On the contrary, have now found that when piston ring land record carries out as present embodiment 25, can obtain the necessary characteristic of record/read.

Embodiment 26

In embodiment 26, measure the reflectivity of the piston ring land part of using the optical recording media for preparing with the foregoing description 20 same way as under these conditions.As shown in table 1, this reflectivity is 49.5%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.58.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Also find to work as the material of cushion by ZnS-SiO ₂Become SiO ₂The time, although reflectivity improves, maximum signal amplitude worsens slightly.Yet, have now found that to obtain the necessary characteristic of record/read.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 20.On the contrary, have now found that when piston ring land record carries out as present embodiment 26, can obtain the necessary characteristic of record/read.

Embodiment 27

In embodiment 27, use the reflectivity of the piston ring land part of the optical recording media for preparing with the foregoing description 21 same way as to measure under these conditions.As shown in table 1, this reflectivity is 33.9%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.79.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Also find to work as the material of cushion by ZnS-SiO ₂When the thickness that becomes the Ag alloy and second recording layer changed, although reflectivity generation slight deterioration, maximum signal amplitude was improved and can obtains the necessary characteristic of record/read.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 21.On the contrary, have now found that when piston ring land record carries out as present embodiment 27, can obtain the necessary characteristic of record/read.

Embodiment 28

In embodiment 28, measure the reflectivity of the piston ring land part of using the optical recording media for preparing with the foregoing description 22 same way as under these conditions.As shown in table 1, this reflectivity is 47.9%.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Embodiment 29

In embodiment 29, measure the reflectivity of the piston ring land part of using the optical recording media for preparing with the foregoing description 23 same way as under these conditions.As shown in table 1, this reflectivity is 44.2%.

Measure the polarity and the maximum signal amplitude of tracer signal.As shown in table 1, the polarity of tracer signal is H to L, and its maximum signal amplitude is 0.55.

Even have now found that when groove record becomes the piston ring land record, also can obtain the necessary reflectivity of record/read.

Also find to become SiO by the Ag alloy when the material of cushion ₂The time, although the maximum signal amplitude slight deterioration, reflectivity is improved and can obtains the necessary characteristic of record/read.

When groove record carries out,, also can't obtain the necessary characteristic of record/read even in optical recording media with the same manner preparation as embodiment 23.On the contrary, have now found that when piston ring land record carries out as present embodiment 29, can obtain the necessary characteristic of record/read.

Comparative example 1

In comparative example 1, on second base material, form and depth of groove to be 120nm (being equivalent to about λ/5.5), recess width (G is wide) be the gathering sill of 410nm for 330nm and land width (L is wide).

Sputter Ag alloy is to form cushion.As the coating condition, the rotary coating metal complex azo dyes is to form second recording layer with the dye strength of 1.90 weight %.

So the thickness (thick film portion, G thickness) of the groove part of second recording layer that forms is 70nm, and the thickness (film section, L thickness) of piston ring land part is 30nm.

Measure the as above reflectivity of the groove part of the optical recording media of preparation under these conditions.As shown in table 1, this reflectivity is 9.0%.

Have now found that with the various embodiments described above and compare, when the degree of depth of the second base material upper groove is very big, can't obtain the necessary reflectivity of record/read.

Comparative example 2

In comparative example 2, except the material of cushion is SiO ₂In addition, reflectivity uses the method identical with above-mentioned comparative example 1 to measure.As shown in table 1, this reflectivity is 6.5%.

Become SiO even have now found that material by the Ag alloy when cushion ₂The time, also can't obtain the necessary reflectivity of record/read.

Comparative example 3

In comparative example 3, on second base material, the formation depth of groove is that 160nm (being equivalent to about λ/4), recess width (G is wide) are the gathering sill of 430nm for 310nm and land width (L is wide).

Sputter Ag alloy is to form cushion.As the coating condition, the rotary coating metal complex azo dyes is to form second recording layer with the dye strength of 1.90 weight %.

As above the thickness of the groove part of second recording layer of Xing Chenging (thick film portion, G thickness) is 75nm, and the thickness (film section, L thickness) of piston ring land part is 20nm.

Measure the as above reflectivity of the groove part of the optical recording media of preparation under these conditions.As shown in table 1, this reflectivity is 12.9%.

Have now found that with above-mentioned comparative example 1 and compare, when the degree of depth of the second base material upper groove increases,, can't obtain the necessary reflectivity of record/read although this reflectivity increases.

Comparative example 4

In comparative example 4, except the material of cushion is SiO ₂In addition, reflectivity uses the method identical with above-mentioned comparative example 3 to measure.As shown in table 1, this reflectivity is 19.9%.

Become SiO even have now found that material by the Ag alloy when cushion ₂The time, although this reflectivity increases, can't obtain the necessary reflectivity of record/read.

Conclusion

Have now found that the degree of depth of the groove on second base material, for example, when as above-mentioned comparative example 1～4, being 120nm or 160nm, can't obtain containing the dye recording layer recorded information or therefrom reading the necessary reflectivity of information being arranged in away from second of the position of light beam light incident side.On the contrary, have now found that the degree of depth when the second base material upper groove, for example, as the foregoing description 1～29, be reduced to when being less than or equal to 65nm, in piston ring land record and groove write down, all can obtain containing the dye recording layer recorded information or therefrom reading the necessary reflectivity of information being arranged in away from second of the position of light beam light incident side.

Have now found that, in the foregoing description 1,8～11,19～21 and 23, in groove record, be difficult to obtain contain the dye recording layer recorded information or therefrom read the necessary record of information/read characteristic (polarity, maximum signal amplitude) being arranged in away from second of the position of light beam light incident side.On the contrary, have now found that, in the foregoing description 2,14～17,25～27 and 29, in piston ring land record, can obtain containing the dye recording layer recorded information or therefrom reading the necessary record of information/read characteristic (polarity, maximum signal amplitude) being arranged in away from second of the position of light beam light incident side.

In above-mentioned each embodiment, adopt the no groove base material that does not have recording layer and translucent reflective layer to write down body with the influence of eliminating first information record body and the characteristic of assessing second recording layer as far as possible exactly as the first information.Yet the use of common first information record body can not produce very big influence to the assessment of second recording layer.

In the employed medium, can obtain sufficient reflectivity in embodiment 1～29, this is to the of paramount importance requirement of record/read.It is believed that by suitably selecting the structure except that depth of groove, can obtain having other excellent record/read optical recording media of characteristic.

In embodiment 2,14～17,25～27 and 29, it is believed that by suitably selecting the structure except the recording layer thickness, can obtain having other excellent record/read optical recording media of characteristic.

The application is based on Japanese patent application 2003-109486 that submitted on April 14th, 2003 and the Japanese patent application 2003-110579 that submits on April 15th, 2003, and its full content is hereby incorporated by.

Claims (13)

1. optical recording media, this optical recording media comprises first base material, first with gathering sill at least and contains second base material that dye recording layer, translucent reflective layer, second contain dye recording layer, reflection horizon and have gathering sill, in described optical recording media by from the described first base material side illumination beam and contain dye recording layer and described second described first and contain the dye recording layer recorded information or therefrom read information;

The degree of depth of the described gathering sill of wherein said second base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

2. optical recording media, this optical recording media comprises first base material, first with gathering sill at least and contains second base material that dye recording layer, translucent reflective layer, second contain dye recording layer, reflection horizon and have gathering sill, in described optical recording media by from the described first base material side illumination beam and contain dye recording layer and described second described first and contain the dye recording layer recorded information or therefrom read information;

The degree of depth of the described gathering sill of wherein said second base material is shallower than the degree of depth of the described gathering sill of described first base material.

3. optical recording media, this optical recording media comprises the first information record body and second authenticable information recording, described first information record body contains dye recording layer and translucent reflective layer and stacks gradually having on first base material of gathering sill and form by contain first of first dyestuff to the major general, described second authenticable information recording is by to the major general reflection horizon with contain second of second dyestuff and contain dye recording layer and stack gradually having on second base material of gathering sill and form, described optical recording media is by being bonded together described first information record body and described second authenticable information recording across the optical transparence bonding coat, the opposing face of the described base material of the described base material of described first information record body and described second authenticable information recording is formed toward each other, in described optical recording media by writing down or read information from the described first base material side illumination beam;

The degree of depth of the described gathering sill of wherein said second base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

4. optical recording media, this optical recording media comprises a plurality of dye recording layers that contain, in described optical recording media by writing down or read information from one side illumination beam;

Wherein being used in the degree of depth that contains the dye recording layer recorded information or therefrom read the gathering sill of information that is positioned at away from the position of this light beam light incident side is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

5. optical recording media, this optical recording media has the base material that contains dye recording layer, reflection horizon and have gathering sill at least, in described optical recording media by from a side illumination beam opposite and contain the dye recording layer recorded information or therefrom read information described with described base material;

The degree of depth of the described gathering sill of wherein said base material is 1/100 * λ～1/6 * λ, and wherein λ represents record/read wavelength.

6. record/the read method that is used for optical recording media, described optical recording media comprises first and contains dye recording layer and have second of thick film portion and film section and contain dye recording layer, by from one side illumination beam and contain dye recording layer and second first and contain the dye recording layer recorded information or therefrom read information, described record/read method may further comprise the steps in described optical recording media:

Containing dye recording layer through described first contains described light beam irradiates the described film section of dye recording layer and contains in the dye recording layer recorded information or therefrom read information described second to described second.

7. record/the read method that is used for optical recording media as claimed in claim 6, the wherein said second described thick film portion that contains dye recording layer and described film section are corresponding and form with recess and protuberance on the base material respectively, and described base material is arranged on the base material of a side opposite with the light beam light incident side.

8. as claim 6 or the 7 described record/read methods that are used for optical recording media, this method may further comprise the steps:

With described light beam irradiates to the described first thick film portion that contains dye recording layer to contain in the dye recording layer recorded information or therefrom to read information described first.

9. record/the read method that is used for optical recording media as claimed in claim 8, the wherein said first described thick film portion that contains dye recording layer and described film section are corresponding and form with recess and protuberance on the base material respectively, and described base material is arranged on the base material of described light beam light incident side.

10. optical recording media, this optical recording media comprises the first information record body and second authenticable information recording, described first information record body contains dye recording layer and translucent reflective layer and stacks gradually having on first base material of gathering sill and form by contain first of first dyestuff to the major general, described second authenticable information recording is by to the major general reflection horizon with contain second of second dyestuff and contain dye recording layer and stack gradually having on second base material of gathering sill and form, described optical recording media is by being bonded together described first information record body and described second authenticable information recording across the optical transparence bonding coat, the opposing face of the described base material of the described base material of described first information record body and described second authenticable information recording is formed toward each other, in described optical recording media by writing down or read information from the described first base material side illumination beam;

Wherein said second contains dye recording layer has thick film portion and film section, and with described light beam irradiates to the described second described film section that contains dye recording layer with recorded information in the described film section or therefrom read information.

11. optical recording media as claimed in claim 10, wherein said first contains dye recording layer has thick film portion and film section, and with described light beam irradiates to the described first described thick film portion that contains dye recording layer with recorded information in described thick film portion or therefrom read information.

12. an optical recording media, this optical recording media comprise a plurality of dye recording layers that contain, in described optical recording media by writing down or read information from one side illumination beam;

Wherein the dye recording layer that contains away from described light beam light incident side has thick film portion and film section, and with described light beam irradiates to described film section with recorded information in described film section or therefrom read information.

13. as the manufacture method of each described optical recording media in claim 1～5 and 10～12, this manufacture method may further comprise the steps:

On described second base material or described base material, form gathering sill with the negative pressure mould.

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