Abstract: A recording material includes a dye-bonded polymer compound which contains a polymer compound to which a one-photon absorption dye is bonded, and a glass transition temperature of the recording material is higher than 200° C. An optical information recording medium includes a recording layer and an intermediate layer adjacent to the recording layer, and the recording layer contains the above-described recording material.

Abstract: An optical information recording medium includes at least one recording layer. The recording layer includes a recording material comprising a polymer compound to which a one-photon absorption dye is bonded, and a coupling strength ?2 between the one-photon absorption dye and the polymer compound in the recording material is higher than a coupling strength estimated to be exerted between the same one-photon absorption dye and the same polymer compound if the one-photon absorption dye is dispersed in the polymer compound in the recording material.

Abstract: The present invention provides a non-resonant two-photon absorption recording material containing a non-resonant polymer two-photon absorption compound, and the non-resonant two-photon absorption recording material wherein the main chain of the non-resonant polymer two-photon absorption compound contains at least one member selected from polystyrene, polyacrylate, polymethacrylate-polyester, polyurethane, polyether and polyimide, and also provides an optical information recording medium having a recording layer containing the recording material.

Abstract: The object of the invention is to provide an optical information recording medium which excels in stability e.g., for preserving the properties during a long-term storage and which enables recording using a laser having a small peak power, and a method for manufacturing such an optical information recording medium. An optical information recording medium 10 includes a recording layer 14, and intermediate layers (adhesive agent layer 15A and recording layer support layer 15B) adjacent to the recording layer 14, and the recording layer 14 includes a recording material comprising a one-photon absorption dye bound to a polymer binder (polymer compound).

Abstract: A multilayer structure sheet for manufacturing an optical information recording medium having a multilayer structure with a plurality of recording layers is disclosed. The multilayer structure sheet comprises at least one unit structure in which a pressure sensitive adhesive layer, a recording layer, a recording layer support layer having a glass transition temperature higher than that of the pressure sensitive adhesive layer, and a recording layer are laid one on top of another in this order, and a release sheet is attached to an outside of an outermost pressure sensitive adhesive layer.

Abstract: An optical information recording medium 10 comprises a plurality of recording layers 14, and intermediate layers 15 each provided between the recording layers 14. Each of the recording layers 14 includes polymer binder and dye dispersed in the polymer binder, and the dye is subject to multi-photon absorption of a recording beam RB having a predetermined wavelength and to linear absorption not smaller than 1.5% per recording layer at the predetermined wavelength of the recording beam. When the dye is irradiated with the recording beam and generates heat by linear absorption and multi-photon absorption of the recoding beam RB, the polymer binder undergoes a change of shape by the generated heat, whereby an interface between the recording layer 14 and the intermediate layer undergoes a change of shape to record information.

Abstract: An optical information recording medium 10 comprises a plurality of recording layers 14 and intermediate layers 15 each provided between the recording layers 14. Each of the recording layers 14 includes a polymer binder and dye dispersed in the polymer binder, and a thickness of each recording layer is equal to or greater than 50 nm. A first interface (near-side interface 18) is formed between a recording layer 14 and an intermediate layer 15 that is adjacent to the recording layer 14 on one side of the recording layer 14 in a thickness direction of the recording layer 14, and a second interface (far-side interface 19) is formed between the recording layer 14 and an intermediate layer 15 that is adjacent to the recording layer 14 on the other side of the recording layer 14 in the thickness direction of the recording layer 14.

Abstract: The magnetic recording medium is a particulate magnetic recording medium for heat-assisted recording, as well as includes a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic organic material support and a heat-diffusing layer of higher thermal conductivity than the magnetic layer between the nonmagnetic organic material support and the magnetic layer.

Abstract: The magnetic recording medium is a particulate magnetic recording medium for heat-assisted recording, as well as includes a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic organic material support and a heat-diffusing layer of higher thermal conductivity than the magnetic layer between the nonmagnetic organic material support and the magnetic layer.

Abstract: A method for manufacturing a multilayer structure sheet for manufacturing an optical information recording medium having a multilayer structure with a plurality of recording layers comprises: an adhesive layer forming step of forming an adhesive layer on a first release sheet to obtain a first sheet; a recording layer forming step of forming a recording layer containing a polymer on a second release sheet or a release assisting layer formed on the second release sheet to obtain a second sheet; a laminating step of laminating the recording layer of the second sheet on the adhesive layer of the first sheet to obtain a third sheet in which the second sheet is laid on the first sheet; and a heating step of heating the second sheet.

Abstract: An optical information recording medium comprises recording layers which include a polymer binder and a dye dispersed in the polymer binder or include a polymer to which a dye is bonded, and each recording layer has a refractive index unchangeable under irradiation with a recording beam, with first and second interfaces being defined between the recording layer and two intermediate layers adjacent thereto. Irradiation of a region of the recording layer adjacent to the first interface or a region of the recording layer adjacent to the second interface with the recording beam causes the dye to absorb the recording beam and generate heat which in turn deforms the polymer in the recording layer, forming a protrusive shape protruding into an intermediate layer at the first or second interface whereby information is recordable in separate information layers at both of the first and the second interfaces.

Abstract: A multilayer structure sheet for manufacturing an optical information recording medium having a multilayer structure with a plurality of recording layers is disclosed. The multilayer structure sheet comprises at least one unit structure in which a pressure sensitive adhesive layer, a recording layer, a recording layer support layer having a glass transition temperature higher than that of the pressure sensitive adhesive layer, and a recording layer are laid one on top of another in this order, and a release sheet is attached to an outside of an outermost pressure sensitive adhesive layer.

Abstract: The present invention provides a non-resonant two-photon absorption recording material containing a non-resonant polymer two-photon absorption compound, and the non-resonant two-photon absorption recording material wherein the main chain of the non-resonant polymer two-photon absorption compound contains at least one member selected from polystyrene, polyacrylate, polymethacrylate, polyester, polyurethane, polyether and polyimide, and also provides an optical information recording medium having a recording layer containing the recording material.

Abstract: An optical information recording medium includes: a recording layer 12 comprising a multi-photon absorption compound and a one-photon absorption compound; and a supporting member (base layer 11) configured to support the recording layer 12. In this optical information recording medium, absorption of multiple photons by the multi-photon absorption compound and absorption of one photon by the one-photon absorption compound cause a void to be generated in the recording layer, whereby information is recordable by modulation based on a presence or absence of a void.

Abstract: A two-photon absorption material that can, thanks to a compound of, for example, the following formula (6), perform non-resonant two-photon absorption by light in the region shorter than 700 nm with high sensitivity and has sufficient recording/reproduction properties, a two-photon absorption recording material, a recording medium and a two-photon absorption compound usable therein are provided.

Abstract: An optical information recording medium 10 comprises a plurality of recording layers 14, and intermediate layers 15 each provided between the recording layers 14. Each of the recording layers 14 includes polymer binder and dye dispersed in the polymer binder, and the dye is subject to multi-photon absorption of a recording beam RB having a predetermined wavelength and to linear absorption not smaller than 1.5% per recording layer at the predetermined wavelength of the recording beam. When the dye is irradiated with the recording beam and generates heat by linear absorption and multi-photon absorption of the recoding beam RB, the polymer binder undergoes a change of shape by the generated heat, whereby an interface between the recording layer 14 and the intermediate layer undergoes a change of shape to record information.

Abstract: An optical information recording medium comprises a plurality of recording layers, and intermediate layers provided between the plurality of recording layers. The optical information recording medium has a recess for use in tracking, in a layer which is provided in a position farther, than the plurality of recording layers, from a light-incident side on which a beam emitted for recording/reading enters. A depth D of the recess is ?/4n where ? is a wavelength of the beam emitted for recording/reading, n is a refractive index of a layer with which the recess is filled.

Abstract: An optical information recording medium 10 comprises a plurality of recording layers 14 and intermediate layers 15 each provided between the recording layers 14. Each of the recording layers 14 includes a polymer binder and dye dispersed in the polymer binder, and a thickness of each recording layer is equal to or greater than 50 nm. A first interface (near-side interface 18) is formed between a recording layer 14 and an intermediate layer 15 that is adjacent to the recording layer 14 on one side of the recording layer 14 in a thickness direction of the recording layer 14, and a second interface (far-side interface 19) is formed between the recording layer 14 and an intermediate layer 15 that is adjacent to the recording layer 14 on the other side of the recording layer 14 in the thickness direction of the recording layer 14.

Abstract: Optical information recording medium comprises: a plurality of recording layers 14, each of which undergoes a change in refractive index by irradiation with recording beam; and an intermediate layer 15 provided between recording layers 14. The recording layer 14 contains polymer binder and dye dispersed in the polymer binder, and at least in proximity to an interface (far-side interface 18) between the intermediate layer 15 and a recording layer 14 disposed adjacent to incident side of the intermediate layer 15 from which the recording beam enters the intermediate layer, the intermediate layer 15 has refractive index different from that of the recording layer 14. Glass transition temperature of the polymer binder is lower than melting point and decomposition point of the dye, and refractive index of the polymer binder changes by receiving heat generated when the dye absorbs the recording beam, whereby information is recordable in the recording layer.

Abstract: Recording and reading method for optical information recording medium comprising: recording layer having thickness not less than 2?/n, where ? is wavelength of recording beam and n is refractive index of the recording layer, and configured to undergo a change in the refractive index by irradiation with the recording beam; and adjacent layer adjacent to the recording layer at a side opposite to an incident side, comprises the steps of: recording a recording spot by irradiating with the recording beam, while shifting focal position by offset amount d, which satisfies ?0d3?0, where ?0 is radius of the recording spot, from interface between recording layer and adjacent layer toward the incident side at a time of recording, whereby the refractive index of recording layer changes at a recording position to record recording spot; and reading out the information by irradiating with reading beam, while bringing it into focus on the interface.