35results about How to "Well documented characteristics" patented technology

A heat sealable printing sheet (1) includes a sheet-shaped base member (50), and an ink receiving layer (53) disposed on a first surface of the base member (50) and having a heat sealability. The heat sealable printing sheet further includes a heat sealable layer (52) disposed on a second surface of the base member (50) and made of a heat sealable resin material. The ink receiving layer (53) contains inorganic fine particles, a water soluble resin, and a water dispersible resin. The water dispersible resin has a glass transition temperature (Tg) satisfying from -35 DEG C to 35 DEG C.

The present invention provides an Al-based alloy reflecting film which reduces noise on an optical information recording medium by having a reflecting film surface accurately reproduce grooves, pits and the like formed on a substrate, and has high reflectivity. A sputtering target which is effective for forming such a reflecting film is also provided. The reflecting film to be used for the optical information recording medium is substantially composed of an Al-based alloy containing 2.0-15.0 atm% of a rare-earth element, and has a crystallite size of 30 nm or smaller in the thickness direction of the reflecting film.

A magnetic recording medium including a magnetic recording layer and a substrate that supports the magnetic recording layer is provided. At least two underlayers including a nonmetallic underlayer are placed between the magnetic recording layer and the substrate. The perpendicular magnetic recording medium uses a double-layered or tri-layered underlayer. Accordingly, a perpendicular magnetic recording layer can have a high perpendicular magnetic anisotropic energy constant Ku due to a third underlayer and have small crystal grains and a small exchange coupling due to a second underlayer below the third underlayer. Thus, the perpendicular magnetic recording layer can have a good thermal stability, high-density recording characteristics, and excellent SNR characteristics.

The invention provides a double-layer recordable optical recording medium, which includes a first information layer; a middle layer disposed on the first information layer; a second information layer disposed on the middle layer. The first information layer, the middle layer, the second information layer are deposited in sequence from laser irradiation side, wherein the first information layer from the laser irradiation side at least includes: membrane containing Bi as primary component, dielectric layer, reflection layer and heat diffusion layer, The second information layer from the laser irradiation side at least includes: membrane containing Bi as primary component, dielectric layer, reflection layer, and the region of the ratio t2 / t1 of the thickness (t2) of the dielectric layer of the second information layer to the thickness (t1) of the dielectric layer of the first information layer is 0.7 to 1.5 or 4.5 to 6.0.

Provided are an optical information recording medium having an excellent recording characteristic and its production method by suppressing the decomposition of dyestuff which is contained in a dyestuff recording layer when an optical hardening resin is optically hardened to form an optical hardening layer. The optical information recording medium is composed of a disk shape transparent baseboard 12 with a center hole formed in a center part, a light reflection layer 16, the dyestuff recording layer 14 containing an organic dyestuff, an intermediate layer 22, an adhesion layer 24 and a thin film protection layer 26. The light reflection layer 16, the dyestuff recording layer 14 and the intermediate layer 22 are arranged on an area where a pre- groove of the transparent baseboard 12 is formed. The thin film protection layer 26 is arranged on the intermediate layer 22, through the adhering layer 24 which is composed of the optical hardening resin to be hardened by light of a band except the main absorption band of the recording layer dyestuff.

Disclosed is a trimethine dimer compound represented by the general formula (I) below. Also disclosed is an optical recording medium containing such a compound in a recording layer. (I) (In the formula, symbols are as defined in the description. When both Xa2 and Xb2 are imino groups, one of Xa1, Xb1, Xa3 and Xb3 is necessarily an optionally substituted 1-alkyl-1-benzylmethylene group, an optionally substituted 1,1-dibenzylmethylene group, or an optionally substituted cycloalkane-1,1-diyl group having 3-6 carbon atoms.

The present invention relates to an optical recording medium. The optical recording medium according to one embodiment of the present invention includes a substrate and an information recording layer located on the substrate. The information recording layer includes a first recording layer containing at least one element selected from the group consisting of Ag, In, Ge, Sb and Te, a second recording layer containing at least one element selected from the group consisting of Si, Sn, Sb and Ge, and a third recording layer containing at least one element selected form the group consisting of Ni, Ag, Au, W, Cr and Mo. Therefore, the optical recording medium of the present invention may reduce the thickness and manufacturing cost by consisting of three recording layers and eliminating the reflective layer and the dielectric layer.

An information recording method recording information on an information recording medium in the form of a recording mark having a time-length nT by irradiating optical beam pulses thereto according to a recording strategy, the recording strategy comprises the steps of forming the recording mark on the recording medium by controlling a power of the optical beam pulses to one of ternary values Pw, Pb and Pe (Pw>Pe>Pb) and irradiating a heating pulse having a power set to Pw, and a cooling pulse having a power set to Pb, upon the information recording medium alternately; and forming a space on the recording medium subsequent to the recording mark by irradiating the optical beam pulse with the power Pe, the recording strategy increasing the number of said heating pulses by one each time the time-length of the recording mark is increased by 2T, the recording strategy setting a heat pulse starting time sTtop and a heat pulse termination time eTtop for a first heating pulse, when forming a recording mark of a time-length of at least 2T, individually at least in the case of forming a space-length of 2T and the case in which there is formed a space-length of 3T or more, before or after the currently formed recording mark.

The present invention relates to the structure and making process of once writable single sided double layer CD. The once writable single sided double layer CD has one first record layer of organic material, and one second record layer of inorganic material configured on the first record layer. One embodiment of the CD includes one first base material layer, one second base material layer, one adhesive layer, one first record layer including one recording dye layer on the first base material layer and one first reflecting layer on the recording dye layer, one second record layer including one inorganic record layer and one second reflecting layer on the inorganic record layer. The second base material layer is configured on the second reflecting layer, and the adhesive layer between the first reflecting layer and inorganic record layer. The present invention also provides the simple making process of the once writable single sided double layer CD with high product q and low cost.

Provided is an optical information recording medium, comprising on a substrate a recording layer containing a dye compound having a specific structure. An optical information recording method, comprising recording information on the optical information recording medium by irradiation with laser light of a wavelength of 550 or shorter or 440 nm or shorter.

Provided is an optical information recording medium having excellent C / N and reproduction durability and having no inhibition to high density recording. Moreover, the recording and reproducing of high volume and high density information can be done by a blue laser light of short wavelength, and the recording property may have excellent sensitivity and reflectivity. The optical information recording media carry out the recording and reproducing by a laser light of 450 nm or less, wherein grooves having a track pitch of 200 to 400 nm, a groove depth of 50 to 150 nm and a groove half width of 90 to 200 nm are form on the substrate, and a reflective layer, a recording layer and a covering layer are provided thereon. The recording layer comprises an organic substance having maximum absorption at 600 to 800 nm and 300 to 400 nm of more than 1. When a laser light of 380 to 500 nm wavelength is irradiated through a lens with a numerical aperture (NA) of 0.7 or more to a substrate, the recording layer of the optical information media carry out the recording of information. The recording layer contains organic substance and the substrate has a groove depth of 15 to 45 nm, a track pith of 250 to 400 nm and a half width of groove of 60 to 200 nm an oblique angle of the groove of 40 to 80 DEG.

The invention provides an optical information recording medium of a blue light structure which gives play to excellent recording characteristics when recording and with easy manufacturing. The optical information recording medium comprises a reflective layer, a recording layer, a barrier layer, and a cover layer in turn on a surface of a support. The recording layer includes at least an azopigment compound in group selection composed of an azo compound and an azo metal coordination compound including an azo compound and a metal ion or a metal oxide ion, wherein the extinction coefficient of the azopigment compound is in the range of 0.15-0.3 at the wavelength of 405 nm. A layer is formed between the barrier layer and the cover layer, which implements curingprocess on the an ultraviolet radiation-curable composition, having a glass transition temperature of equal to or lower than 25 DEG C.

The present invention provides a hologram recording material which is suitable for volume hologram record and can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low dimensional change (low shrinkage) and high multiplicity in holographic memory record using not only a green laser but also a blue laser; and provides a hologram recording medium having a hologram recording layer comprising the hologram recording material. A hologram recording material comprising a metal oxide matrix and a photopolymerizable compound, wherein the metal oxide matrix comprises at least Si and Ti as metallic elements, and Ti originates from titanium-containing oxide fine particles. A hologram recording medium ( 11 ) having the hologram recording layer ( 21 ) comprising the hologram recording material.

An optical recording medium includes a substrate having successively disposed thereon a light-reflecting layer, a recording layer and a cover layer, with recording and playback being effected by irradiating the medium with a laser beam having a wavelength of 450 nm or less from the side disposed with the cover layer, wherein a sputter layer having a thickness of 1 to 80 nm is formed between the recording layer and the cover layer, and the sputter layer and the cover layer are adhered with an adhesive. So a high-density makeup recording type optical recording medium having superior recording characteristics is provided.

Embodiments of the present invention provide a perpendicular magnetic recording head which can suppress reduction in recording field and efficiently reduce a fringe field. According to one embodiment, a side shield 13 disposed at a side of each side face in a cross track direction of a main pole 11 is arranged at a far leading side compared with the main pole.

An optical recording medium having favorable recording sensitivity and repetition recording characteristic is used for recording at high speed corresponding to the speed of a 3X to 10X (10 to 36 m / s) DVD. The optical recording medium is characterized in that on a transparent substrate at least a first protective layer, a phase-change recording layer whose maximum recording linear velocity is 10.0 m / s or more and where data is rewritable at least at any linear velocity between 10.0 to 36.0 m / s, a second protective layer, and a reflective layer of heat conductivity of 300 W / m.K or more are formed, and in that further a layer whose film thickness is between 0.5 and 8 nm and which is formed of a low heat-conductivity material having a heat conductivity of 7 W / m.K or less is interposed between the second protective layer and the reflective layer.

An optical storage medium comprising: a substrate; a recording layer for recording a recorded mark representing information to be recorded by irradiating a recording light beam onto the recording layer in accordance with a recording pulse pattern of recording pulses rising from an erasing power and formed between a recording power larger than the erasing power and a bottom power smaller than the erasing power and of erasing pulses rising from the bottom power to the erasing power. The recording layer has been initialized with an initialization laser beam having the erasing power satisfying expressions (1) and (2): 1.000<(R1 / R0)<1.030 (1); 0.030<(R10 / R0)-(R1 / R0)<0.150 (2), in which R0 is a reflectivity exhibited by an un-recorded section of the recording layer, on which no data has ever been recorded, when irradiated with a reproducing light beam, R1 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated once with a light beam having the erasing power, and R10 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated ten times with a light beam having the erasing power.

The optical recording material of the invention is an optical recording material used for an optical recording medium capable of recording information by irradiation of light, the optical recording medium being an optical recording medium which records information at a linear speed of at least 14 m / sec, wherein the dye component in the optical recording material comprises at least one type of chelate compound of an azo compound and a metal, and when the dye component is used as a sample for thermogravimetry in an inert gas atmosphere, the dye component sample exhibits a maximum weight reduction of 0.2-3.0% / DEG C. at 180-250 DEG C.

A polishing pad used in the mirror polishing process of a glass substrate, the polishing pad is characterized by: having a plurality of open pits on the main surface in contact with the glass substrate, one open pit and other open pits adjacent to the open pit Partitioned by a partition wall, an inclined portion is provided on the side of the other opening pit side among the side surfaces of the partition wall, and the inclined portion has a minimum curvature radius of 20-100 μm. According to this polishing pad, it is possible to provide a polishing pad or the like which makes it difficult for polishing liquid components to accumulate in open pits while maintaining the processing rate in the mirror polishing step.

An optical information medium (20) for recording, such as DVR-blue, and a method for manufacturing such a medium (20) is provided. Reading from and recording onto the medium (20) is performed by means of a focused radiation beam (10) having a radiation wavelength » and a numerical aperture NA. Said medium has a substrate (1), and a stack (2) of layers provided thereon. The stack (2) comprises at least a first recording stack (3) and k radiation beam transmissive layers (4, 5). Each transmissive layer (4, 5) has a refractive index n i and an average thickness d i µm and 1 ‰ i ‰ k and k ‰¥ 2. The thickness d k of layer k (5) is determined by a simple formula which depends on the parameters n i for i = 1...k and d i for i = 1...k-1. Such a medium (20) has zero or substantially zero spherical aberration at the focal point, being at the recording layer of the first recording stack (3), of said radiation beam (10).

An optical recording medium includes a disc including a dye layer and a reflecting layer formed on a substrate, a dummy substrate, and an adhesive layer adhering the disc and the dummy substrate.

An optical storage medium comprising: a substrate; a recording layer for recording a recorded mark representing information to be recorded by irradiating a recording light beam onto the recording layer in accordance with a recording pulse pattern of recording pulses rising from an erasing power and formed between a recording power larger than the erasing power and a bottom power smaller than the erasing power and of erasing pulses rising from the bottom power to the erasing power. The recording layer has been initialized with an initialization laser beam having the erasing power satisfying expressions (1) and (2): 1.000<(R1 / R0)<1.030 (1); 0.030<(R10 / R0)-(R1 / R0)<0.150 (2), in which R0 is a reflectivity exhibited by an un-recorded section of the recording layer, on which no data has ever been recorded, when irradiated with a reproducing light beam, R1 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated once with a light beam having the erasing power, and R10 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated ten times with a light beam having the erasing power.

A polishing pad used in a glass substrate mirror-polishing process, characterized in that: the polishing pad has multiple open holes on the main surface that contacts the glass substrate; one open hole and another open hole adjacent thereto are separated by a partition; and of the side surfaces of said partition, an inclined section is provided on the side surface on the side of the other open hole and the inclined section has a minimum radius of curvature 20 - 100 [mu]m. Said polishing pad provides, for example, a polishing pad with which polishing liquid components do not accumulate easily in the open holes while the mirror-finish processing rate is maintained.

The present invention relates to an optical recording medium. The optical recording medium according to one embodiment of the present invention includes a substrate and an information recording layer located on the substrate. The information recording layer includes a first recording layer containing at least one element selected from the group consisting of Ag, In, Ge, Sb and Te, a second recording layer containing at least one element selected from the group consisting of Si, Sn, Sb and Ge, and a third recording layer containing at least one element selected form the group consisting of Ni,Ag, Au, W, Cr and Mo. Therefore, the optical recording medium of the present invention may reduce the thickness and manufacturing cost by consisting of three recording layers and eliminating the reflective layer and the dielectric layer.

To provide an optical recording medium which can produce successful recording properties in recording at a high lineal speed, can successfully retain the properties of performing a single round or a plurality of rounds of overwrite, and has high long-term shelf stability. A phase-changing type optical recording medium comprises a substrate 1 and at least a recording layer 3 and a reflective layer 5. A material for the recording layer 3 is a Ge-Sb-In-Sn alloy. When the respective atomic ratio of the constituent elements of the alloy is given as a, b, c and d, the relationship among following formulae (1) to (4) is satisfied: 0.08<=a<=0.20... (1), 0.60<=b<=0.80... (2), 0.05<=c<=0.20... (3), 0.01<=d<=0.15... (4), provided, however, that a+b+c+d=1.

The lower magnetic pole layer has a magnetic pole part layer and a yoke part layer. The upper magnetic pole layer has a magnetic pole part layer and a yoke part layer. The magnetic pole portion layer of the lower magnetic pole layer, the recording gap layer, and the magnetic pole portion layer of the upper magnetic pole layer have the same cross-sectional shape parallel to the upper surface of the substrate. The assembly of the two magnetic pole portion layers and the recording gap layer includes a first portion having a width defining the track width and a second portion having a width greater than the width of the first portion. When the width of the first part is W and the distance from the media facing surface ABS to the boundary position of the first part and the second part is L, L / W is 2 or more and 5 or less. When the area of ​​the cross section of the assembly parallel to the upper surface of the substrate is S, S / (W×L) is 5 or more and 40 or less.

The present invention provides a hologram recording material which is suitable for volume hologram record and can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low dimensional change (low shrinkage) and high multiplicity in holographic memory record using not only a green laser but also a blue laser; and provides a hologramrecording medium having a hologram recording layer comprising the hologram recording material. A hologram recording material comprising a metal oxide matrix and a photopolymerizable compound, whereinthe metal oxide matrix comprises at least Si and Ti as metallic elements, and Ti originates from titanium-containing oxide fine particles. A hologram recording medium ( 11 ) having the hologram recording layer ( 21 ) comprising the hologram recording material.

An optical information recording medium including a substrate having a groove that has a track pitch of 200 to 400 nm and a depth of 10 to 150 nm, the substrate having successively disposed thereon a light-reflective layer, a recording layer and a cover layer, wherein information is recordable and reproducible by irradiating a laser beam having a wavelength of 500 nm or less from a side of the medium disposed with the cover layer, and the light-reflective layer contains aluminum or an aluminum alloy. The optical information recording medium which reduces a cost and has excellent recording characteristics by using a light reflection layer consisting of aluminum or aluminum alloy.