Matches 1 - 50 out of 292 1 2 3 4 5 6 >
Match Document Document Title
7311516 Die for molding disk substrate and method of manufacturing disk substrate  
A die for molding a disk substrate capable of forming fine recessed and projected pits and grooves up to the outer periphery of the disk substrate by preventing low heat conductive elements from...
7171676 Stamper for producing optical recording medium, optical recording medium, and methods of producing the same  
A method of producing a stamper, an optical recording medium produced by molding using the stamper, and a method of producing the same, wherein a base member having a mirror polished main surface...
6971116 Stamper for producing optical recording medium, optical recording medium, and methods of producing the same  
A stamper suppressed in surface roughness, uneven thickness, and deviation of circularity in inner circumference, a method of producing the same, an optical recording medium produced by molding...
6887404 Security marking system and method for minimizing pirating of data on data media including compact discs and digital versatile discs  
The present invention is a method and system of marking data media products by introducing a predetermined tracing substance constituting a security marking into a polycarbonate (or polystyrene)...
6869557 Multi-level stamper for improved thermal imprint lithography  
A stamper/imprinter for use in performing thermal imprint lithography of a substrate/workpiece surface to form a pattern of features in first portions of the surface intended to receive the...
6849390 Stamper-forming electrode material, stamper-forming thin film, and method of manufacturing optical disk  
A stamper-forming electrode material contains Cu as its main ingredient and at least one other element, preferably Ag and/or Ti. It is preferred that the Ag content be 10.0 wt % or less and that...
6761618 Defect-free magnetic stampers/imprinters for contact patterning of magnetic media  
A method of manufacturing a magnetic stamper/imprinter for use in patterning of magnetic recording media by means of a contact printing process, comprising sequential steps of: (a) providing a...
6703100 Disk-like recording medium and method for producing the same  
A recording medium for information signals including a substrate, a signal recording layer provided on one major surface of the substrate and a clamp member having a positioning unit at its center...
6696099 Optical disk employing integral substrate, and method for manufacturing the same  
An optical disk, which comprises: a common integral substrate having grooves and/or pits formed on its both sides: and a film structure on at least one side of the integral substrate. They are...
6520764 Molding die for optical recording disk  
There is disclosed a molding die which can prevent or restrain a wedge-like deformation from being formed at an outer peripheral portion of an optical recording disk. The molding die is for molding...
6464487 Injection-moulding tool for the production of information carriers in disc form  
An injection-moulding tool ( 10 ) for the production of information carriers in disc form, in particular in the form of CDs and/or DVDs, comprises for the forming of an injection mould ( 25 ) a...
6354827 Stamper assembly for manufacturing optical data storage disks  
Disclosed is a stamper assembly for forming an optical data storage disk in a disk molding process. The stamper assembly includes a block element having a first major surface, and a stamper member...
6210609 Method of manufacturing optical recording medium  
In the method of manufacturing an optical recording medium according to the present invention, when an optical recording medium having at least first and second minute concave and convex surfaces...
6165391 Manufacture of optical data storage disc  
A method and apparatus forming a micro-relief pattern on a surface of an optical disc, which micro-relief pattern may form a holographic image in which a shim bearing a micro-relief pattern is...
6143231 Dynamic mold seal  
A dynamic mold seal for a mold having two relatively movable mold halves is provided. The dynamic mold seal is formed by a sealing ring mounted or secured to a first one of the mold halves. The...
6099287 Stamper protecting layer for optical disk molding apparatus  
A stamper protecting layer is interposed between a mold and a stamper of an optical disk molding apparatus, so that forces generated by extension and shrinkage of the stamper in a diametrical...
6068906 Mold for making disc substrate, process for producing mold and disc substrate  
A disc substrate molding metal mold apparatus adapted for molding synthetic resin material to carry out molding of disc substrate of an information signal recording medium. This metal mold...
5897814 Method for injection molding of optical discs  
In a method for controlling the heat transfer in a process for molding an optical disc of the type having a plurality of laser readable depressions of a predetermined quality, the process steps...
5851620 Disc metal mold and recorded disc  
Improved disc metal mold provides an improved disc without a ring groove thereon. The improved disc metal mold has a fixed metal mold section and a movable metal mold section for forming a cavity...
5820898 Metal mold apparatus for molding an optical disk  
An optical disk metal mold apparatus includes a fixed cavity plate; a movable cavity plate facing the fixed cavity plate; a disk-shaped plate disposed on at least one of the fixed and movable...
5783371 Process for manufacturing optical data storage disk stamper  
A process for manufacturing an optical data storage disk stamper includes the steps of providing an amorphous electroless nickel substrate including phosphorous in the amount in a range of about 5...
5783233 Cooling device of an injection mold for making an optical disk substrate  
A cooling device of an injection mold for an optical disk substrate reduces the chances of cavitation caused by a turbulent flow of passing cooling water, thus enabling a disk cavity plate to be...
5770348 Optical disk and method for its manufacture  
This invention provides an optical disk whose recorded information cannot be easily copied to other recording media, with practically no degradation of strength. The optical disk of this invention...
5766652 Means for holding a stamper plate in a molding metal die  
An apparatus for holding a stamper plate in a molding metal die is provided which comprises a cavity plate having a cavity center hole, a stamper plate press member having a flange portion larger...
5753275 Cavity plates aligning and guiding apparatus in disk injection molding dies  
An apparatus for guiding and aligning fixed side and movable side disk cavity plates of disk injection molding dies of an injection molding device is provided with a plurality of first grooves...
5738886 Mold for disk substrate  
A mold for molding a substrate of a disk, including a stationary and a movable mold half which are movable relatively to each other, a positioning ring portion on the movable mold half, for...
5705105 Process for making optical disk substrates  
A process for producing high-density thin type optical disk substrates having good replicability and birefringence sufficient for practical use. In filling the resin into the cavity, the stress on...
5693348 Disc molding die  
A disc molding die includes a stationary-side mirror block disposed on a stationary die, a movable-side mirror block disposed on a movable die and facing the stationary-side mirror block so as to...
5690974 Metal mold for molding runnerless product  
A novel and improved metal mold for molding a runnerless product can be provided. The metal mold according to the present invention comprises a stationary and a movable mold halves, one of which is...
5686026 Process for manufacturing optical discs  
A process of manufacturing the optical discs by injection molding includes compulsive forced cooling of the molded discs, carried out after sputtering to shorten the cooling time in the mold, in...
5683630 Process for making optical disk substrates  
A process for producing high-density thin type optical disk substrates having good replicability and birefringence sufficient for practical use. In filling the resin into the cavity, the stress on...
5674284 Intraocular lens with fracture resistant haptics  
The polymethyl methacrylate (PMMA) or copolymer thereof used to produce one-piece intraocular lenses is modified by a compression molding process to produce a much tougher material with improved...
5648106 Injection mold for molding information recording discs  
An improved injection mold for molding an information recording disc is provided. It includes a holder frame fitted to a mold fitting plate, a mirror platen member for a stamper held in the holder...
5607705 Mold for molding disc substrata  
A mold for molding digital data discs has interchangeable stampers. An outer peripheral stamper retainer and a mirror block with a convex portion allow interchange without dismounting the mold. The...
5593710 Mold capable of changing a set position of a stamper plate  
A mold for molding disk substrata is capable of changing a set position of a stamper plate on a mold cavity. A pair of mirror plates are respectively for forming the surface of a disc cavity or for...
5552098 Method for fabrication of disc substrate  
An improved method for forming a disc substrate having a bottomed centering hole for rotating and driving the disc. The method includes injecting synthetic resin into a mold cavity formed by a...
5516276 Injection molding apparatus for molding a disc having a replaceable die  
A die assembly for molding a disc such as a compact disc, a video disc or the like by employing an injection molding process. The die assembly comprises a stationary die half including as essential...
5509991 Method of producing an optical disk having an integrated label layer  
An inventive method for producing an optical tape comprises the steps of sequentially depositing a label layer and a reflection layer on a substrate. The label layer and the reflection layer has a...
5501592 Mold having opposed offset cooling channels  
In an injection mold having a cavity formed between opposing faces of a fixed mold and a movable mold for defining a shape of a product, and cooling channels formed in the fixed mold and the...
5498509 Method of making an optical information recording substrate  
An optical information recording substrate and method of producing the substrate, the substrate having a legible matter formed in a groove area thereof or a pit array area thereof, wherein the...
5494782 Direct to stamper/mother optical disk mastering  
A method and apparatus for creating an optical disk mother or stamper wherein the number of processing steps is greatly reduced from the prior art methods. In particular, the present invention...
5466319 Method for making optically readable media containing embossed information  
A method for making an optically readable medium containing a relief information track comprising the sequential steps of (a) laminating a dry photohardenable film to a surface of a transparent...
5466145 Disc base board molding die including stamper plate attaching/detaching device  
To injection-mold a base board for an optical disc or the like, an injection molding die includes a stamper plate attaching/detaching device installed therein. The stamper attaching/detaching...
5464339 Molding dye for disk substrate  
A disk substrate molding die is provided in which the quantity of eccentricity of a stamper can be reduced to a small value. The molding die includes a member having mounted thereon a thin plate...
5460763 Sprueless disc mold and disc molding method thereof  
A sprueless disc mold including: a gate insert; a hot plunger adapted to come into sliding contact with the gate insert and heated and held; drive means for moving the hot plunger to open/close the...
5441399 Method of removing stuck sprue and tool for removal therein  
An improved method of removing a stuck sprue from the ejector assembly of an injection molding machine and a tool for use in the method in which the tool has a body with a hollow lower portion...
5427520 Mold device for fabricating disc substrate  
A metal mold device for molding a disc substrate formed by molding a synthetic resin material and having a raised portion on the inner surface of the disc substrate, includes a fixed metal mold and...
5423672 Molding device having a ring-gating and hole forming valve gate pin  
In order to facilitate the formation of a plastic member with an aperture in a central portion thereof, a ring gating valve arrangement is provided with a multi-piston servo arrangement which...
5409641 Optical disk manufacturing method  
In the optical disk manufacturing method a clamping plate is placed in the cavity of a disk body and the disk body is heated and compressed to connect the clamping plate to the disk body. Prior to...
5389313 Method of producing a molding die for an information recording medium  
A method produces a molding die for an information recording medium, having a mold surface with a prescribed unevenness pattern comprising a projection; the projection having different etching...
Matches 1 - 50 out of 292 1 2 3 4 5 6 >