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| Number | Title | Issue Date |
| 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 peeling off and burrs from occurring on the outer periphery thereof. Th... | 12/25/2007 |
| 7300609 | Injection-moulding tool for the production of information carriers in disc form An injection-moulding tool for the production of a mould in disc form, in particular in the form of information carriers such as CDs and/or DVDs, wherein the injection-moulding tool comprises a first and a second mirror block, wherein the first and second mirror blo... | 11/27/2007 |
| 7275397 | Method of molding a silica article Disclosed are high temperature free-flow mold for the production of near net-shape silica articles and method for the production of near net-shape silica articles. The mold is preferably made of graphite, preferably coated with SiC on the surfaces of the mold cavity... | 10/02/2007 |
| 7229275 | Disk substrate, mold apparatus for injection molding the same, and disk substrate taking-out robot It is possible to obtain a disk substrate in which an edge of a center hole is free of flash. The disk substrate (23) in which the center hole (24) is provided with a straight portion (24a) and a tapered portion (24b), and a... | 06/12/2007 |
| 7211213 | Injection-molding nozzle system for injection-molding systems for plastic materials, injection-molding tool and method for producing injection-molded parts The present invention relates to an injection-molding nozzle system for injection-molding systems for plastic materials which is equipped with a needle sealing system and is suitable both for different cavities as well as for plastic materials of different viscositi... | 05/01/2007 |
| 7147790 | Perpendicular magnetic discrete track recording disk A method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk. In one embodiment, the soft magnetic underlayer is continuous throughout the discrete track recording pattern. ... | 12/12/2006 |
| 7147814 | Injection molding method and injection mold An injection molding method and an injection mold used therefor are provided, in which a molded product free from burrs, whitening and gate marks can be obtained with a simple structure mold, and it can adequately serve the needs for multicavity molding as well. In ... | 12/12/2006 |
| 7074358 | Polymer casting method and apparatus Methods and materials used to make detailed cast objects are disclosed. The cast objects are formed in mold created from a photosensitive laminate. The mold is formed by selectively removing portions of the photosensitive laminate. The invention is particularly well... | 07/11/2006 |
| 7051429 | Method for forming a medium having data storage and communication capabilities A method for forming a medium having a substrate is formed have a patterned surface with a channel pattern and a transponder having a memory is provided in the channel pattern. A conductive material is deposited in the channel pattern with the conductive material op... | 05/30/2006 |
| 7054256 | High capacity digital data storage by transmission of radiant energy through arrays of small diameter holes A storage media for storage of data thereon is provided. The storage media including: a first layer, the first layer being substantially transparent to a predetermined radiant energy used for reading the data; and a second layer formed on the first layer and being s... | 05/30/2006 |
| 7014786 | Methods and apparatus for forming submicron patterns on films A method for forming a patterned film on a substrate, the method including: providing a first flowable medium on the substrate and a second flowable medium on the first flowable medium, the first and second flowable media having different dielectric properties and d... | 03/21/2006 |
| 7008585 | Mechanism for making openings in plastic parts within a mold tool An assembly disposed within a mold for forming openings in a plastic part includes a punch pin and a backing pin having faces disposed flush with a surface of a mold cavity. The backing pin is disposed opposite the punch pin. The punch pin is driven into the complet... | 03/07/2006 |
| 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 pattern, without incurring random formation of undesired, disordered feature... | 03/22/2005 |
| 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 the Ti content be 5.0 wt % or less. A stamper-forming thin film is made... | 02/01/2005 |
| 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 stamper/imprinter comprising a body of a magnetic material having ... | 07/13/2004 |
| 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 portion and formed of a material that can be magnetically ... | 03/09/2004 |
| 6668894 | Film layer separation device for multi-layer disks A film layer separation device for multilayer disks is disclosed. With the help of a stamper made of magnetic materials, the film layer separation is achieved through the attractive force imposed on the stamper by electromagnetic tearing. The device conta... | 12/30/2003 |
| 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 a thin circular plate optical recording disk by injecting... | 02/18/2003 |
| 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 having a first major surface and an opposite, second major... | 03/12/2002 |
| 6280661 | Apparatus and process for producing optical recording medium In order to realize a compact construction of an apparatus for producing an optical recording medium while shortening the time required for transporting a mold, there is provided an apparatus for producing an optical recording medium by curing a curable r... | 08/28/2001 |
| 6264459 | Multiple injection moulding unit An injection moulding unit includes at least two injection moulds for manufacturing disc-like objects. The injection moulds each further include two mould parts which are mutually displaceable between a closed position in which they bound a mould cavity a... | 07/24/2001 |
| 6261083 | Nozzle for injection molding A nozzle for processing of plastics by way of an injection molding machine comprising a basic body (1), a nozzle head (2) and a thermally conducting torpedo (3) which are heated directly or indirectly respectively by a heating device (8). The thermally co... | 07/17/2001 |
| 6174487 | Air blowing method for mold for a disk molding and a mold therefor The stamper 16 is disposed opposing to the cavity 3 formed between the fixed mold 1 and the movable mold 2, as a holding means of the circumference of the stamper the flat type of holding means 17 is provided, and when using this molded product for moldin... | 01/16/2001 |
| 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 sealing ring includes a rigid ring portion and a sealing port... | 11/07/2000 |
| 6139307 | Assembly for molding optical data storage disks formatted on both sides A mold assembly for forming a replica disk in a disk molding process. The replica disk includes a formatted surface on both sides. The mold assembly includes a disk substrate cavity defined by a first block having a first major surface, a second block hav... | 10/31/2000 |
| 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 apparatus is adapted so that smoothing layers of metal are integra... | 05/30/2000 |
| 5997276 | Optical disc manufacturing apparatus A disc is provided which includes a disc body of disc shape having a center hole. An information recording area is formed on one side surface of the disc body. The information recording area has information thereon read by reflection of laser light. The i... | 12/07/1999 |
| 5961901 | Injection compression molding method and injection compression molding machine Into the cavity formed by closing a stationary mold with a movable mold, material is filled through a gate portion of a female cutter. After the material is filled into the cavity, a male cutter is advanced at a high speed from a starting position S to a ... | 10/05/1999 |
| 5958651 | Methods for providing artwork on plastic information discs Artwork is imparted to plastic discs such as CDs, CD ROMs, and DVDs (digital video discs) by exposing a layer of photoresist material on a substrate to light from an original image of the artwork. The material of the photoresist layer is exposed to differ... | 09/28/1999 |
| 5906775 | Method of producing substrate for optical disc A prescribed molded substrate is molded out of a melted resin with a stamper having projections for forming pits with the shape of the projections preliminarily set to be greater than the shape of pits of the substrate to be molded. The relationship betwe... | 05/25/1999 |
| 5900200 | Hot runner valve gate and method for eliminating unidirectional molecular orientation and weld lines from solidified resin used for forming molded articles A valve gate injection nozzle includes a valve stem for guiding molten resin to a molding area. The valve stem includes an input area for receiving the molten resin, a central area following the input area for processing the molten resin and an output are... | 05/04/1999 |
| 5852329 | Optical disc molding device and molding method for optical disc An optical disc molding device has a pair of molds for injection molding a disc substrate within cavities, and a stamper supported within at least one cavity, for molding a data recording surface in such a manner that the inside diameter side of the stamp... | 12/22/1998 |
| 5833902 | Injection molding apparatus and process for changing mold elements The invention covers an injection molding apparatus and injection molding process. The apparatus has at least a first and second injection molding machine adjacent one another, with each machine including upper and lower mold elements operative to form mo... | 11/10/1998 |
| 5820794 | Multi-layer optical recording medium manufacturing method A multi-layer optical recording medium manufacturing method and apparatus thereof forms a resin layer having a second recording layer on a first recording layer. The first recording layer includes a reflecting layer and a first recording layer sequentiall... | 10/13/1998 |
| 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 cavity plates such that it is movable with respect thereto; a s... | 10/13/1998 |
| 5792492 | Optical disk molding apparatus equipped with liquid sealing means An optical disk molding apparatus is provided which includes a fixed side mold assembly and a movable side mold assembly. Each mold assembly has a mounting plate, a disk cavity plate, a temperature control liquid passage, and a temperature control liquid ... | 08/11/1998 |
| 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 than the stamper plate center hole, a vacuum evacuation dev... | 06/16/1998 |
| 5720994 | Mold for molding discs to be laminated into double discs A mold is for molding DVD discs to be joined together, back-to-back, to make a single disc. The mold includes a movable moldhalf and a stationary moldhalf. On one of the half-molds an inserting block extends a small distance into the mold cavity, so that ... | 02/24/1998 |
| 5700501 | Injection mold for molding discs An injection mold for molding discs is provided, wherein the injection mold comprises a base die, a board fitted inside the base die, a stamper in the form of a doughnut fitted to the front surface of the board, an outer ring fitted to the front end of th... | 12/23/1997 |
| 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 provided at the center thereof with a recess and the othe... | 11/25/1997 |
