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| Number | Title | Issue Date |
| 7440152 | Holographic disk medium with servo marks The present invention relates to a holographic disk medium (1) with servo marks (7), and more specifically to a holographic disk medium (1) having a common reflective layer (3) for reflecting a servo beam (9) and object and referen... | 10/21/2008 |
| 7352685 | Reverse optical mastering for data storage disk replicas A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replic... | 04/01/2008 |
| 7349323 | Reverse optical mastering for data storage disks A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replic... | 03/25/2008 |
| 7307769 | Hologram recording medium, recording/reproducing method and recording/reproducing apparatus A hologram recording medium is for recording or reproducing information with light irradiated thereto. The medium has a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of the recording layer from a light irradiate... | 12/11/2007 |
| 7294281 | Optical information recording medium, original disc for optical information recording medium, and method of manufacturing the same An optical information recording medium, which includes both of a land surface and a groove surface as a recording track and presents high signal quality. The optical information recording medium includes both a land and a groove as the recording track on a substrat... | 11/13/2007 |
| 7037413 | Optical information recording medium, producing method thereof and method of recording/erasing/reproducing information The present invention provides an optical information medium having excellent weather resistance and repeating characteristics. The optical information medium has a barrier layer between a protective layer and a recording layer. The barrier layer includes GeN or GeO... | 05/02/2006 |
| 7016294 | Inner region identifier for optical disk A first surface optical disk is disclosed that has machine readable code information, such as bar code information, disposed thereon to permit a disk drive or other device to obtain certain basic information regarding the disk in an efficient and reliable manner. Th... | 03/21/2006 |
| 6558774 | Multiple-layer backcoating for magnetic tape A magnetic tape comprises a substrate having on one side thereof a magnetic layer serving as a recording surface, and on the other side thereof at least two layers containing inorganic particles which serve as a non-recording surface, wherein said magneti... | 05/06/2003 |
| 6232045 | System for creating, reading and writing on rotatable information storage media, a method for producing a recording blank A photolithographic process is provided for producing a blank storage disk which includes a reference track pattern. The track pattern provides two edges as reference lines from which distances are determinable for the purpose of laser writing multiple in... | 05/15/2001 |
| 5989671 | Optical recording medium and manufacturing method thereof An optical tape including an optical recording layer for permitting information to be optically recorded thereon and a light-reflective magnetic layer. The light-reflective magnetic layer which reflects light projected onto the recording layer, also permi... | 11/23/1999 |
| 5689496 | Optical recording medium having spiral tracks formed with a turning angle of more than 360° An optical recording medium enables an optical pickup to quickly access a plurality of items of information progressing concurrently or to be selected simultaneously. By provision of spiral multitrack formed by multiple winding of a plurality of tracks in... | 11/18/1997 |
| 5625618 | Optical recording medium employing an intermittent pattern for guiding tracks and tracking apparatus for the same An optical recording medium has a track format with a track pitch smaller than a diffraction limit of a light spot so as to realize an increased capacity and a higher density. A guide groove for tracking purposes is formed along each of the concentrically... | 04/29/1997 |
| 5600627 | Optical disk and a method for recording, reproducing, and deleting information on and from the optical disk The method of the present invention is for recording, reproducing, and deleting information on and from an optical disk including a plurality of tracks each having M guide grooves (M is an integer equal to or larger than 2) and M-1 land(s) interposed betw... | 02/04/1997 |
| 5500266 | Spin-coating compensation for an optical storage medium with a substrate groove profile gradient When a dye material layer is spin-coated on an optical storage medium of the type having grooves fabricated in a substrate thereof, the dye material layer surface has depressions in the vicinity of the grooves. These depressions have a profile which is a ... | 03/19/1996 |
| 5377178 | Data recording/reproducing method and apparatus using a recording medium having clock marks recorded in a wobbled track for read/write synchronization A data recording/reproduction method and apparatus uses an optical disk equipped with wobbling track guide grooves disposed in a track scanning direction and minutely wobbled. The apparatus uses a circuit for detecting and correcting displacement of an op... | 12/27/1994 |
| 5325353 | Optical recording medium An optical recording medium formed of a pre-grooved substrate provided with a recording layer formed on the groove, in which the groove has a shape to satisfy the condition IGr /I0 ࣙ0.85, where I0 represents the reflecte... | 06/28/1994 |
| 5216665 | Information recording medium An optical recording medium is formed by applying a coating liquid to form a light-reflecting layer on a substrate having a surface provided with a pre-format pattern comprising a concavity and a convexity. The concavity is designed to have a sectional sh... | 06/01/1993 |
| 5212682 | Write-one type recording medium storing time and data-writing management data and recording apparatus thereof A write once-type recording medium with a guide groove has a first management data for constantly managing a position of a track in the groove after data-writing/reading is excuted and a second management data for managing the data-writing, both optically... | 05/18/1993 |
| 5210738 | Optical information recording medium An optical information recording medium, such as an optical disk, includes a meandering guide groove being varied in period according to first additional information and in amplitude according to second additional information. The optical information reco... | 05/11/1993 |
| 5144552 | Optical information storage medium having grooves and pits with specific depths, respectively An optical information storage medium is used for recording optical information therein and reproducing optical information therefrom. The optical information storage medium includes parallel, concentric, or helical tracking guide grooves and information ... | 09/01/1992 |
| 5089358 | Optical recording medium An optical recording disk comprises a base plate, a flat layer, an optical recording layer and a protection layer which are laminated in this order. The flat layer has a flat surface which contacts with the optical recording layer to thereby enable the op... | 02/18/1992 |
| 5070490 | Optical recording medium with tracking tracks extending beyond the recording layer and a method for detecting tracking signal from said medium In an optical recording medium a substrate is provided having at least a recording surface and a recording layer on an area of the recording surface having a length in a longitudinal direction. A set of linear continuous tracking tracks is formed on the r... | 12/03/1991 |
| 5008176 | Information recording medium having a glass substrate An information recording disk for recording an information signal along a track defined by a depression on the disk as a change of physical property of a recording material deposited on the track comprises a disk-shaped glass substrate made of a glass and... | 04/16/1991 |
| 4947384 | Optical disk having narrow and wide guide grooves An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information recorded at that part of the land.... | 08/07/1990 |
| 4937810 | Optical recording tape with continuous prerecorded tracks An optical recording medium in tape form which may either be strips of tape or reels of tape, all having preformatted continuous servo tracks from one end to the other. Preformatted servo tracks are spaced-apart lines, so as to permit data spots to be wri... | 06/26/1990 |
| 4885736 | Optical recording medium with track and track number guides An optical recording medium having a plurality of tracks juxtaposed each other and capable of easily and rapidly detecting a desired track. An optical recording medium includes a data recording region in which the tracks are juxtaposed each other and a tr... | 12/05/1989 |
| 4858221 | Preformatted information medium and optical reader device The invention relates to optical memories making use of optical interaction between an incident ray and an information medium (83) capable of having data written thereon and of having data read therefrom, which data is organized in a adjacent track elemen... | 08/15/1989 |
| 4818648 | Optical memory element An optical memory element comprising a substrate with grooves functioning as grooves for, for example, controlling the position of a laser beam, wherein said substrate is composed of a glass containing SiO2 in the range of 51 to 71% by weight, ... | 04/04/1989 |
| 4803677 | Rotary recording medium having a guide track and recording and reproducing apparatus therefor A disc comprises a recording surface which is divided into a plurality of equiangular sectoral regions and a guide track formed on the recording surface. Each track turn of the guide track is constituted by a row of pits formed in every other equiangular ... | 02/07/1989 |
| 4802160 | Optical disk substrate An optical disk substrate has a surface on which a pre-groove for light beam tracking is formed. Non-pregrooved regions on the substrate surface on which the pregroove is formed are subjected to surface roughing processing to improve adhesion of the subst... | 01/31/1989 |
| 4797316 | Etched glass and process of manufacturing same The invention relates to an article comprising a glass sheet and having an etched pattern, and to a process of manufacturing an article comprising a glass sheet and having an etched pattern. The glass sheet 11 is a chemically tempered glass sheet, and the patt... | 01/10/1989 |
| 4789979 | Optical disk exclusively used for reproduction wherein guide grooves located between data managing information and data recording regions have no track address sections An optical disk exclusively used for reproduction has an optically detectable guide groove in which signals have previously been recorded. One type of optical disk exclusively used for reproduction is interchangeable with an optical disk which allows both... | 12/06/1988 |
| 4787075 | Optical information recording medium and apparatus for recording/reproducing information using the same An optical information recording medium in the form of a card having tracking tracks for obtaining a tracking signal and clock tracks for obtaining a clock signal arranged alternately and record zones for recording information between each of the tracking... | 11/22/1988 |
| 4783776 | Method of recording and reproducing digital information and apparatus therefor A digital information recording and reproducing method for significantly improving the transfer rate of digital information, comprises the steps of: forming a plurality of light beam guide tracks on a recording medium capable of multiple light-wavelength ... | 11/08/1988 |
| 4778747 | Method of manufacturing optical memory element A method of manufacturing an optical memory element, which includes the steps of applying a first photo-resist layer onto a glass substrate for an optical memory element, laying a mask plate on the glass substrate applied with the first photo-resist layer... | 10/18/1988 |
| 4689782 | Recording disk centering and clamping apparatus A motor driven hub has a socket defined concentrically therein, with an annular disk bearing surface left around the socket for supporting a flexible magnetic disk. Movable into and out of engagement with the hub is a rotatable clamp having a central body... | 08/25/1987 |
| 4606018 | Optical recording medium A reflection-type optical recording medium which has a surface on which track guide grooves are formed and in which a layer of a recording material that has an increased energy reflection coefficient in a write portion. The track guide grooves are formed ... | 08/12/1986 |
| 4586173 | Optical disk In an optical disk, a light reflective layer is formed on a transparent substrate, and a groove serving as a tracking guide is formed on the surface of said light reflective layer, continuously extending along the circumference of the optical disk. Pits a... | 04/29/1986 |
| 4578788 | High performance optical storage medium with separate mechanical servo tracks embedded within the medium An optical storage medium incorporates stacked servo and data layers with the pattern of the servo layer being prepared prior to preparation of the data layer. The servo pattern comprises an undulation in a very thin film of high optical index material on... | 03/25/1986 |
| 4547876 | Optical recording medium and information record and method of making same The invention comprises an improved optical recording medium and information record wherein the light sensitive layer comprises a tracking layer having one or more openings extending therethrough and an absorber layer overlying the tracking layer and the ... | 10/15/1985 |
