Patent application number | Description | Published |
20090028039 | METHOD FOR PRODUCING OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM - In case a convex portion acting as a protector is formed on a signal face of a disc by a liquid material such as radiation cure resin, two substantially concentric concave portions are preliminarily provided on a substrate. A liquid material is dripped onto a region interposed between the concave portions and is cured such that the convex portion having desired height and width can be formed on the region. | 01-29-2009 |
20090046567 | OPTICAL INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording medium, includes a disc-shaped substrate, at least one information recording layer formed over a recording/reproducing-side main surface of the substrate, a light transmitting layer formed over the information recording layer, and a protecting layer formed to cover the light transmitting layer and at least one part of a side end surface perpendicular to the main surface of the substrate. At least the part of the side end surface is covered with the protecting layer for covering the recording/reproducing-side main surface, and the surface of the protecting layer covering at least the part of the side end surface has a larger surface roughness than that of the surface of the protecting layer covering the upper of the recording/reproducing-side main surface. | 02-19-2009 |
20090065131 | METHOD OF AND APPARATUS FOR MANUFACTURING MULTI-LAYER OPTICAL INFORMATION RECORDING MEDIUM - A transfer layer on a surface of a mold has a thickness distribution along the radius direction that the layer is thick in an inner round portion but is gradually thinner toward an outer round portion. An adhesive layer is formed between a surface of a signal substrate which bears a signal recording film and the mold which seats the transfer layer. The adhesive layer has a thickness distribution that the layer is thin in an inner round portion but is gradually thicker toward an outer round portion. Since the thickness distributions along the radius direction of the transfer layer and the adhesive layer are opposite to each other, the thickness distribution of an isolation layer which comprises the two layers is uniform. | 03-12-2009 |
20090188615 | METHOD FOR MANUFACTURING MULTILAYER OPTICAL RECORDING MEDIUM - The method for manufacturing a multilayer optical recording medium of the invention includes a plurality of signal recording layers in the signal recording and reading side, an interlayer of a resin layer between the signal recording layers, and a transparent protection layer with a thickness of 10 μm to 150 μm as an outermost layer. The multilayer optical recording medium has a clamp area corresponding to a region inside of the signal recording region, wherein the clamp area ranges in diameter from a diameter of 23 mm to the inner diameter of the signal recording region. The method includes: preparing a substrate having the signal recording layers in the main surface side in the signal recording and reading side and projections in a region in the inner side than a diameter of 22 mm, wherein the height difference between the height at a diameter of 23 mm and the height at a diameter of 21 mm is 20 μm or lower; preparing a stamper; applying a radiation-curable resin for the interlayer from the inner side than the clamp area of at least one of the substrate and the stamper; laminating the substrate and the stamper to sandwich the radiation-curable resin between the substrate and the stamper; curing the radiation-curable resin; and separating the stamper from the substrate to obtain a radiation-curable resin layer after the curing as the interlayer on the substrate. | 07-30-2009 |
20090285084 | OPTICAL DISK WITH PLURAL SUBSTRATES - An optical disk of the present invention includes a first substrate having a signal area on a principal plane and a central hole, and a second substrate that is transparent and attached to the first substrate. The second substrate is thinner than the first substrate, and has a central hole whose diameter is larger than that of the first substrate. The first substrate and the second substrate are attached to each other with radiation curable resin (adhesive member) disposed therebetween so as to extend at least from an inner peripheral edge of the second substrate to an outer peripheral edge thereof. | 11-19-2009 |
20100157784 | MANUFACTURING METHOD FOR OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM - There is provided a manufacturing method for an optical information recording medium having three information recording layers, two intermediate layers, and one light transmitting layer, the method includes: providing a first UV curable resin on a first information recording layer; forming a first intermediate layer by curing the first UV curable resin by performing first-time UV irradiation to irradiate the first UV curable resin with UV light emitted from above the first UV curable resin at a first dose; providing a second information recording layer on the first intermediate layer; providing a second UV curable resin on the second information recording layer; forming a second intermediate layer by curing the second UV curable resin by performing second-time UV irradiation to irradiate the second UV curable resin with UV light emitted from above the second UV curable resin at a second dose; providing a third information recording layer on the second intermediate layer; providing a third UV curable resin on the third information recording layer; and forming a light transmitting layer by curing the third UV curable resin by performing third-time UV irradiation to irradiate the third UV curable resin with UV light emitted from above the third UV curable resin at a third dose, wherein the first UV curable resin and the second UV curable resin have substantially the same characteristics in terms of the relationship between total UV dose received and coefficient of linear expansion, and wherein the first dose during the first-time UV irradiation, the second dose during the second-time UV irradiation, and the third dose during the third-time UV irradiation are controlled so that a total UV dose received by the first intermediate layer and a total UV dose received by the second intermediate layer become substantially the same. | 06-24-2010 |
20120020199 | INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING INFORMATION RECORDING MEDIUM - An information recording medium includes a substrate, and particle portions arranged in isolated relation on the substrate and each including an information recording material. A width of each of the particle portions in an information recording direction is not more than 30 nm. The information recording medium further includes pillars arranged in isolated relation on the substrate. Each of the particle portions is formed of the information recording material formed on each of the pillars. A width of each of the pillars in the information recording direction is not more than 30 nm, and a height of each of the pillars is larger than a thickness of the information recording material. | 01-26-2012 |