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| Number | Title | Issue Date |
| 7515524 | High density disk recording medium and apparatus using the same The present invention relates to a high-density disk that is structured to prevent a collision of an optical pickup's objective lens with the high-density disk if the disk is placed upside down in a disk device that is able to record and reproduce signals to/from th... | 04/07/2009 |
| 7396575 | Molding die apparatus, method for disc substrate, and disc-shaped recording medium Preventing a molded disc substrate from generating a separation pattern. To this end, a molding die 1 includes a pair of stationary die 6 and movable die 7, and an outer circumference ring 16 for molding an outer circumference end of the ... | 07/08/2008 |
| 7369469 | Laser power control apparatus and method, an optical disk apparatus and a recording method A laser power control apparatus is for use in an optical disk apparatus for recording information on an optical disk having at least a first layer and a second layer. The laser power control apparatus includes a power control section for controlling a laser element ... | 05/06/2008 |
| 7336596 | Optical storage medium An optical disk consists of a first laminated layer structure and a second laminated layer structure. The first structure has a first transparent substrate having a first surface and a second surface on both sides thereof, provided on the first surface being a light... | 02/26/2008 |
| 7296478 | Master carrier for magnetic transfer, inspecting method thereof, and magnetic recording medium producing method In a master carrier for magnetic transfer which comprises a support that has a transfer-recording pattern arrayed in the track direction thereof in accordance with the information to be transferred to a magnetic recording medium, and a magnetic layer formed on the t... | 11/20/2007 |
| 7290709 | Information card system A data distribution system (10) including an information card (12) to work with a reader (14, 72). The information card (12) includes visible indicia (20) on its front, stripe zones (34) and a ring zone (36) nominally... | 11/06/2007 |
| 7290272 | Optical data recording disc with protrusion between clamping area and center hole A disc-shaped optical data recording medium has a signal recording layer for reading and/or writing data using light, and a 10 μm to 200 μm thick transparent protective layer disposed over the signal recording layer. The optical data recording medium includes a pr... | 10/30/2007 |
| 7283458 | Optical information recording medium, and method and device for optical information recording/reproduction using same A recording layer (2) and a light-transmitting layer (3) are provided on a substrate (1) having a guide groove for tracking a light beam projected in a spot for information recording/reproduction. The spot light beam is projected onto the record... | 10/16/2007 |
| 7233554 | Disk drive system employing effective disk surface stabilization mechanism A stabilization part stabilizes surface vibration of a flexible optical disk along a rotation axis direction of the optical disk by means of pressure difference of air flow created according to Bernoulli's law at a portion on which information writing/reading is per... | 06/19/2007 |
| 7227717 | Asymmetric disk surface properties in one head disk drives A disk drive for storing data includes a drive housing and an asymmetrical storage disk. The storage disk includes a body region, a first side region, and an opposed second side region. The side regions are asymmetrical relative to the body region. Various structure... | 06/05/2007 |
| 7224665 | Optical recording medium its manufacturing method and injection molding apparatus In an optical disc in which an information signal is recorded/reproduced by irradiating a laser beam to a disc substrate 1 in which an information signal portion 1c has been provided on one principal plane from the side where the information sig... | 05/29/2007 |
| 7221640 | Method of manufacturing an optical storage medium and optical storage medium A method of manufacturing an optical storage medium is provided, which comprises at least a transparent spacer layer (22) or transparent cover layer. This layer is provided by spincoating a liquid layer (22) between an inner radius ri and outer radius ... | 05/22/2007 |
| 7212489 | Optical disc and method of protecting same An optical disc for storage and retrieval of digital data, and a system and method for protecting the optical disc is disclosed. The optical disc has projections or embossments on one or both surfaces. When the optical disc is placed on a substantially flat surface ... | 05/01/2007 |
| 7190538 | Master carrier for magnetic transfer, inspecting method thereof, and magnetic recording medium producing method In a master carrier for magnetic transfer which comprises a support that has a transfer-recording pattern arrayed in the track direction thereof in accordance with the information to be transferred to a magnetic recording medium, and a magnetic layer formed on the t... | 03/13/2007 |
| 7180709 | Information-storage media with dissimilar outer diameter and/or inner diameter chamfer designs on two sides A single-sided magnetic hard disk 200 is provided that includes opposing first and second sides 300 and 308 having opposing first and second chamfers 408 and 412, respectively. The first chamfer 408 is dissimilar (or differe... | 02/20/2007 |
| 7157031 | Method of replicating a textured surface The present invention relates to methods for forming textured surfaces in a polymeric surfaces. Moreover, the present invention relates to methods for forming textured surfaces in a polymeric surfaces and faithfully replicating the textured surfaces in the surfaces ... | 01/02/2007 |
| 7114947 | Optical disk mold tooling for reduced edge wedge An optical disk exhibiting no detrimental thickness increase (edge wedge effect) that arises at the outer diameter of an optical disk substrate during an injection molding manufacturing process, and an apparatus and method for making such a disk. The optical disk of... | 10/03/2006 |
| 7106686 | Optical information recording medium, method of manufacturing thereof, and method of recording and reproduction An optical information recording medium is provided with a plurality of information layers (2, 3), each of which has a sector structure in which a data area (8, 12) is divided in the circumferential direction by a sector address (9, 13). The pos... | 09/12/2006 |
| 7101588 | Apparatus and method for applying liquid material to form a resin layer A liquid material is applied by spin coating it onto a first main surface of a flat plate to form a coating of the liquid material thereon. The flat plate includes a second main surface which is opposite to the first main surface and a hole which passes through the ... | 09/05/2006 |
| 7065776 | Optical data recording medium and manufacturing method for the same, and a method for clamping the optical data recording medium A disc-shaped optical data recording medium has a signal recording layer for reading and/or writing data using light, and a 10 μm to 200 μm thick transparent protective layer disposed over the signal recording layer. The optical data recording medium includes a pr... | 06/20/2006 |
| 7041333 | Method of and apparatus for manufacturing optical disc A method of manufacturing an optical disc includes easily removing a bump formed on a circumference of the optical disc during forming a transparent layer by using a spin-coating method to form the optical disk having a high-density recording capacity. The method in... | 05/09/2006 |
| 7027385 | Optical disk, disk substrate, and drive An optical disk 100 is provided with a hub 3 at the central portion of a substratel. A relationship Y/X≧0.015, preferably Y/X≧0.05 is satisfied where X is the projected area of the substrate 1 and Y is a contact area between the hub 3... | 04/11/2006 |
| 7012880 | High density disk recording medium and apparatus using the same The present invention relates to a high-density disk that is structured to prevent a collision of an optical pickup's objective lens with the high-density disk if the disk is placed upside down in a disk device that is able to record and reproduce signals to/from th... | 03/14/2006 |
| 7005173 | Optical disk for mobile device An optical disk for a mobile device is provided. The optical disk includes a substrate, having an outer diameter less than 120 mm and not smaller than 30 mm and a thickness less than 1.1 mm and not smaller than 0.40 mm, so that a deflection angle of 0.7° or smaller... | 02/28/2006 |
| 6940699 | Disk drive apparatus having a pivot for supporting a head assembly to allow free pivoting In a hard disk drive, there are provided a head assembly 13 that drives a magnetic head 33 that reads and writes data on a recording disk, and a flange section that extends toward the periphery on the sleeve 21 of a pivot member 20 that s... | 09/06/2005 |
| 6924020 | Optical disk substrate, optical disk, and method of forming the same An optical disk substrate with a central hole is disclosed in the invention. The optical disk substrate includes: a first annular area for clamping, which surrounds the outer edge of the central hole and includes a first upper surface and a first lower surface there... | 08/02/2005 |
| 6898031 | Method for replicating magnetic patterns on hard disk media A system and method for replicating magnetic patterns on hard disk media includes a mask located over or above a magnetic recording layer. The recording layer may include a single, dual, or multi-layer recording layer. A pattern is or has been formed in the mask, wh... | 05/24/2005 |
| 6880166 | Optical recording medium having in a static mode, a flexible region extending to 1/3 of the recording area An optical recording medium with a circular body including a substrate, a recording layer and a dielectric layer on the substrate, the circular body having a recording/reproducing area and a hub attached to a surface of the circular body. When the circular body stan... | 04/12/2005 |
| 6831881 | Equalizer-effect media system and method A piece of media, apparatus and method are provided wherein the piece of media may store the audio data as well as equalizer settings that permit the audio data to be equalized. In one embodiment, the piece of media stores equalized audio data and the equalizer sett... | 12/14/2004 |
| 6735166 | Optical disk with pattern and fabrication method thereof On a data recording region, an aluminum reflective film is formed together with a reflective film forming a pattern on an outer circumferential side of the data recording region. Although aluminum identical to the material of the reflective film on the data recordin... | 05/11/2004 |
| 6732192 | Disc recording scheme for enabling quick access to disc data A system for recording data to a disc shaped record medium. The data is recorded according to a universal disc format employing a hierarchical file system, and data within the hierarchical structure is referenced using pointer information. The pointer information in... | 05/04/2004 |
| 6697324 | Optical data recording medium This invention is an optical data recording medium having a substrate protective film for effectively suppressing deformation (warpage) associated with change in environmental humidity. The optical data recording medium includes a transparent substrate, a... | 02/24/2004 |
| 6603733 | Optical information medium An optical information disk with an excellent mechanical precision is provided. Also provided is a multi-layer optical disk having a plurality of data layers wherein every data layer exhibits sufficient properties in reading. In addition, such multi-layer... | 08/05/2003 |
| 6498777 | Optical recording medium having a land height ratio In an optical recording medium comprising a substrate including parallel extending lands and grooves on one surface thereof, the grooves serving as recording tracks, and the lands being formed with prepits, the height HP of the land disposed be... | 12/24/2002 |
| 6368691 | Substrates disk for digital video A substrate disk consists of a first and a second substrate connected to one another wherein the first and second substrates have center holes. The first substrate has at least one projection positioned at the circumference of the center hole and projecti... | 04/09/2002 |
| 6353173 | Compressed audio data format and file system structures A method for writing compressed audio data to a compact disc media is provided. The method includes selecting songs to be written in a session and reserving a first track. After the first is reserved, the method proceeds to writing a first temporary data ... | 03/05/2002 |
| 6349086 | Optical disc and method for manufacturing same An optical disc and its manufacturing method in which humps may be prohibited from being formed on an outer rim area of the disc to assure optimum surface properties of a light transmitting layer of the disc to contribute to further increase in recording ... | 02/19/2002 |
| 6266305 | Device for reading from and/or writing to optical recording media The present invention relates to a device for reading from and/or writing to optical recording media, which has a tracking unit, a four-quadrant detector, two summation points and a phase comparator for tracking in accordance with the differential phase d... | 07/24/2001 |
| 6254966 | Information recording mediums, supporter used in the mediums, manufacture methods of the supporter, manufacturing apparatus of the supporter and stampers for producing the mediums An information recording medium and a supporter used for the information recording medium capable of recording a land/groove recording by using a high density recording technique such as a super-resolution, resulting in a high density recording. An inform... | 07/03/2001 |
| 6226109 | Diffractive security device on compact discs This invention relates to marking the genuine CD in an easily detectable way while difficult to counterfeit. The improved CD has within its layers a second structured surface parallel to the flat surfaces of the CD. The second structured surface acts as a... | 05/01/2001 |
