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| Number | Title | Issue Date |
| 7372801 | Reproduction-only optical disc and method of recording and/or reproducing data on and/or from the same A reproduction-only optical disc has a lead-in area, a user data area, and a lead-out area. Disc related information recorded on at least one of the lead-in area and the lead-out area is recorded by high frequency groove wobbles, and data of the user data area is re... | 05/13/2008 |
| 7305689 | Optical recording medium and disc cartridge An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change... | 12/04/2007 |
| 7288154 | Apparatus for optical disc spin-coating and method of coating optical disc There is provided an apparatus for optical disc spin-coating, comprising a cap having a tapered protruding portion or a recess in its central lower portion; a turntable for rotation that has a tapered recess or protruding portion formed in an end of its central axis... | 10/30/2007 |
| 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 |
| 7272841 | Disk for disk drive having crack blocking portions A disk for a disk drive including a disk body with a center through hole for fixing the disk body to a turntable formed at a center thereof, a clamping portion formed on the disk body around the center through hole to fix the disk body to the turntable, a signal rec... | 09/18/2007 |
| 7239589 | Method and apparatus for destructing an optical disc A method and apparatus renders an optical disk unplayable on a customer's optical disc playback machine. A portion of the information bearing surface of the optical disc or the light reflected therefrom, is altered for data destruction from a predetermined area, i.e... | 07/03/2007 |
| 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 |
| 7197756 | Optical disk having a projection with lateral inclined surface The present invention is directed to an optical disk having a projection that prevents full contact of the upper surface of the disk when engaging a supporting surface. The optical disk includes a projection formed in a central portion of the optical disk that abuts... | 03/27/2007 |
| 7149176 | High-density optical disc A compact high-density optical disc capable of securing recording/reproducing characteristics and high-density recording capacity. The high-density optical disc has a whole diameter of 80 mm or less to 28 mm, a whole thickness in a range of 0.3–0.7 mm, and a posit... | 12/12/2006 |
| 7145842 | Objective lens moving control method and apparatus In a layer jump, a control signal based on a focus error signal is masked in a period based on a moving speed of an objective lens so as not to be influenced by an unnecessary light component. Thereafter, an observation of the control signal based on the focus error... | 12/05/2006 |
| 7103896 | Mechanism to aid optical beam focusing on optical disc An optical disc of one embodiment of the invention is disclosed that includes a first surface, a second surface, an optically writable label area, and an optically writable data area. The first and the second surfaces are oppositely situated to one another. The labe... | 09/05/2006 |
| 7096480 | Data storage disk capable of limiting extension of crack A data storage disk capable of limiting a crack from extending during operation is provided. The data storage disk has a center, an outer edge, an inner edge, and at least one slot. The slot is disposed between the outer edge and the inner edge. When a crack occurs ... | 08/22/2006 |
| 7088666 | High density optical disk having capacity of 25GB A high density disc having a data area which is set such that compatibility is secured in the same drive while maintaining a superior recording/reproducing feature, is disclosed. The high density disc has a center hole, a clamping area, a data area where user... | 08/08/2006 |
| 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 |
| 7055156 | Apparatus for reducing tray-in noise While a tray moves into a disk drive, a clamper and a turntable are used to clamp a disk. While the tray is moving into the disk drive without a disk thereon, the clamper and turntable hit with each other, which generates an uncomfortable noise. The apparatus for re... | 05/30/2006 |
| 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 |
| 6944108 | Method for controlling the rotation of optical disk based on disk shapes The optical disk player of the present invention is capable of controlling rotational speed of an optical disk, on the basis of a shape of the optical disk, so as to stably and efficiently write data in and read data from the optical disk. The optical disk player co... | 09/13/2005 |
| 6938265 | Turntable for disk storage medium and disk drive including the turntable A turntable for a disk storage medium includes disk mounting section, shaft center boss and ribs. The disk mounting section includes disk mount surface, center boss and inner side surface. The disk mount surface is used to mount the disk medium thereon. The center b... | 08/30/2005 |
| 6899942 | Optical disk label and method An optical disk of the type rotated by a spindle positioned in a centrally-located hole, and including a disk body including an annular data area, and a centrally-located, integrally-formed annular web positioned radially inward from the annular data area and coveri... | 05/31/2005 |
| 6889381 | Optical recording medium and method of manufacturing the same There is provided an optical recording medium, in which a light transmitting layer is formed on a disc substrate, having less deflection and being excellent in recording/reproducing properties. In an optical disc, an information signal area on which an information s... | 05/03/2005 |
| 6804034 | Fluid containment substrates for holographic media Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. The substrates may be formed with fluid containment features in proximity to outer edges of the respective s... | 10/12/2004 |
| 6747943 | Optical recording medium and disc cartridge An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change... | 06/08/2004 |
| 6728154 | Three-dimensional optical memory medium and process for producing same The invention relates to a three-dimensional optical memory medium capable of recording and reading a large quantity of information therein and therefrom, and a process for producing the same. A recording pulsed laser beam is applied to an arbitrary position in a lu... | 04/27/2004 |
| 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 |
| 6693542 | Electronic article surveillance markers for recorded media A harmonic responsive electronic article surveillance marker is associated with a central, non-recorded region and/or a peripheral non-recorded region of an optically recorded or recordable media. The marker comprising at least one elongated strip, option... | 02/17/2004 |
| 6534142 | Label for non-circular optical discs A label for an optical disc having a non-circular perimeter includes a sheet having a non-circular having a non-circular perimeter and a central aperture disposed in a sheet which has a perimeter for enabling registration of a label with an optical disc i... | 03/18/2003 |
| 6532210 | Disk-type recording medium having a crack hindering element A disk-type recording for protection of media recording and/or reproduction units, including an information recording surface portion disposed around a center hole and a crack hindering element to hinder the generation of a crack at the center hole from a... | 03/11/2003 |
| 6495235 | Optical disk, substrate of the same, and mold for forming the substrate A clamp plate retaining surface, a handling surface positioned outside the outer circumference of the clamp plate retaining surface, and an information surface outside the outer circumference of the handling surface are provided in a substrate. The handli... | 12/17/2002 |
| 6490241 | Sound carrier for a sound illustrated book A sound carrier for a sound illustrated book having a spiral shaped sound groove and adjustment perforations arranged outside of the same and symmetrical with its center axis. At least one, but preferably two, of the adjustment perforations are designed i... | 12/03/2002 |
| 6411594 | Optical disk having clamp portion higher than substrate A magneto-optical disc is prepared having substrates made from polycarbonate, on which recording layers are formed to serve as signal recording medium sections facing each other via a spacer. The magneto-optical disc is also provided with a clamp portion ... | 06/25/2002 |
| 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 |
| 6356517 | Optical disc with a control chip An optical disc has a data disc, a transparent disc to enclose and protect the data disc and an annular control chip securely attached to the clamping area of the transparent disc. The control chip records the data area allocation. Consequently, the data ... | 03/12/2002 |
| 6353591 | Disk rotating device A disk rotating device containing: a rotating plate having a support part on which a disk is mounted, which a motor drives to rotate; a centering member provided on the center of the rotating plate and moveable in the direction of the rotational center ax... | 03/05/2002 |
| 6351449 | Optical disk with recesses inside an inner circumference of an information recording area and method of making same An optical disc 1 has formed in an area inside the inner circumference of an information recording area 2 formed thereon concentric or spiral continuous or discontinuous recesses 4a at a lager pitch than the track pitch in the information recording area 2... | 02/26/2002 |
| 6292461 | Hub-chucking type disklike recording means A disk recording member includes a main body and a center hub mounted in a center hole of the main body. The center hub includes upper and lower hub components for holding upper and lower sides of the main body and a screw for connecting the upper and low... | 09/18/2001 |
| 6292459 | Reduction of electrostatic charge build-up in storage medium A storage medium having a conducting path to dissipate electrostatic charge.... | 09/18/2001 |
| 6285651 | Optical disc for optical storage system An optical disc storage system (10) includes an optical disc (12) having a data surface (70) and a transducing element (30) adjacent the data surface (70). An actuator (22) coupled to the transducing element (30) positions the transducing element (30) rel... | 09/04/2001 |
| 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 |
| 6212159 | Laminated optical disc and turntable for the laminated optical disc A turntable is a table mounted to a shaft (4) of a spindle motor and the turntable supports a laminated disc thereon and drives the disc in rotation. The laminated disc includes a lower disc and an upper disc stacked on the lower disc, and is supported on... | 04/03/2001 |
