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| Number | Title | Issue Date |
| 7430160 | Optical recording medium with different wobble characteristics between the user data area and the lead-out area An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out are... | 09/30/2008 |
| 7366084 | Optical recording medium with different wobble characteristics between the user data area and the lead-out area An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out are... | 04/29/2008 |
| 7274651 | Optical recording medium with different wobble characteristics between the user data area and the lead-out area An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out are... | 09/25/2007 |
| 7230899 | Rewritable type optical disc including recording marks over break portions of recording tracks, manufacturing method and manufacturing system therefor A rewritable type optical disc includes recording tracks formed with break portions; and recording marks corresponding to predetermined data and formed on the recording tracks. The recording marks are formed over the break portions on the recording tracks. If the pr... | 06/12/2007 |
| 7187637 | Opto-mechanical adjustment based on sensing label side of optical disc Opto-mechanical adjustment based on sensing the label side of an optical disc is disclosed. The label side of the optical disc is first sensed with an opto-mechanical system. The opto-mechanical system is then adjusted, based on the label side of the optical disc as... | 03/06/2007 |
| 7110544 | Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical di... | 09/19/2006 |
| 7103781 | OPTICAL DISK, AN OPTICAL DISK BARCODE FORMING METHOD, AN OPTICAL DISK REPRODUCTION APPARATUS, A MARKING FORMING APPARATUS, A METHOD OF FORMING A LASER MARKING ON AN OPTICAL DISK, AND A METHOD OF MANUFACTURING AN OPTICAL DISK Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical di... | 09/05/2006 |
| 6879771 | Recording timing setting apparatus and information recording apparatus A recording timing setting apparatus for setting a recording start timing for recording first recording information onto a recording medium on which second recording information is previously recorded and on which a plurality of synchronization signals are recorded ... | 04/12/2005 |
| 6772429 | Optical recording medium with different wobble characteristics between the user data area and the lead-out area An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out are... | 08/03/2004 |
| 6620480 | Pre-engraved substrate for magnetic, magneto-optical, or phase transition optical disc The invention concerns a pre-engraved substrate for a memory disc recordable by magnetic, magneto-optical or phase transition constraint, its manufacturing method and the resulting disc. Said pre-engraved substrate comprises a support (1) having at its su... | 09/16/2003 |
| 6341121 | Recorder In a recording apparatus, a pit gain selection circuit 33 converts an amplitude proportional to pit length data into gain data, and outputs the gain data to a pit cutting signal generation circuit 39 via a timing adjustment circuit 35. The generation circ... | 01/22/2002 |
| 6249507 | Information storage systems utilizing media with optically-differentiated data sites Storage density in an optical data storage media and system is increased many times the resolution limit by fully utilizing the much smaller detection limit by differentiating and isolating the active data sites in the media optically. The tracks are preo... | 06/19/2001 |
| 6118756 | Recording medium master production method and recording medium A recording medium of one-side address method capable of easily detecting a synchronous signal and production method of recording medium master used for such a recording medium. The recording medium master production method includes a photo-sensitive laye... | 09/12/2000 |
| 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 |
| 5959960 | Method of providing a range of conformalities for optical recording layers A method of coating an optical recording layer on a transparent grooved substrate is disclosed. The recording layer is coated from a mixture of a primary and a secondary solvent. The solvent mixture provides a wide range of conformalities for optical reco... | 09/28/1999 |
| 5852599 | Optical recording medium and optical recording/reproducing device, and manufacturing method of optical recording medium A magneto-optical disk 1 has a track, wherein one of the sidewalls (sidewall 4) of a groove 2 is wobbled by a wobble signal, and is provided with a notch 5 in the track having a different frequency from the wobble signal. The absolute position of the magn... | 12/22/1998 |
| 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 |
| 5682375 | Information recording medium and method for recording and reproducing thereof Disclosed herein is an information recording medium to be illuminated with an optical radiation beam, comprising a substrate having a surface provided with a preformat comprising a servo track and forming a sectional shape, in transverse to the track, whi... | 10/28/1997 |
| 5582891 | Optical disk substrate with land planes of uniform height A method of making a stamper uses a photoresist disk cut by the application of a laser beam on the land planes thereof, or a stamper which is different in depth between the land plane on the internal peripheral side with respect to the prepit portion and ... | 12/10/1996 |
| 5463614 | Optical recording medium having large guide groove track pitch/meander amplitude ratio A writable optical disk with meandering guide grooves is so arranged that a ratio of "track pitch/meander amplitude" is not less than a certain value, for example 57, at least in an out-of-phase portion in which meander of the meandering guide grooves is ... | 10/31/1995 |
| 5452284 | Optical recording/reproducing medium and apparatus using land and groove encoded information signals and identification signals including position information Both concave and convex portions formed spirally or concentrically on an optical information recording medium are used as recording tracks, in which identification signals including position information on the optical information recording medium and so o... | 09/19/1995 |
| 5386411 | Recordable optical disk and method of manufacturing the same Information is optically recorded to a recordable optical disk by a light beam, and a return light is received from the recordable optical disk to produce a tracking error signal. The recordable optical disk includes: a substrate having a disk shape; a gr... | 01/31/1995 |
| 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 |
| 5339301 | Optically readable record carrier for recording information, method and apparatus for manufacturing such, apparatus for recording and reading information on a such a record carrier A record carrier on which information may be optically recorded and/or read, having a disc-shaped substrate with a spiral or concentric pattern of preformed tracks thereon and a radiation-sensitive layer extending over such track pattern. The tracks are i... | 08/16/1994 |
| 5216664 | Optically readable disc with a centering member fixed to a transparent substrate A transparent substrate has an information layer on an entirely flat side, and a centering member on the other side adapted to cooperate with centering means of an apparatus for inscribing and/or reading the disc. The centering member may be glued in plac... | 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 |
| 5170390 | Optical recording element and driving system An optical recording element comprising a recording medium which includes an information recording area formed at every unit in a non-continuous condition, the recording medium further including sample pits disposed at intervals of a fixed distance for pr... | 12/08/1992 |
| 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 |
| 5084856 | Cutting apparatus for an optical disc A cutting apparatus is provided, in which a recording laser beam from a laser light source is ON/OFF-modulated by an optical modulating device on the basis of a square output signal in which a video FM wave signal is pulse width modulated by an audio FM w... | 01/28/1992 |
| 5084860 | Apparatus for optical disc memory with correction pattern and master disc cutting apparatus A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the... | 01/28/1992 |
| 5040165 | Optical information recording medium and method of fabricating the same An optical information recording medium in which pre-pits longer than the diameter of a reproducing radiation spot and pre-pits shorter than the diameter of the reproducing radiation spot coexist, the width W of the pre-pit longer than the diameter of the... | 08/13/1991 |
| 4954380 | Optical recording medium and process for production thereof An optical recording medium comprises an optical recording layer on a transparent substrate. The optical recording layer is then selectively irradiated with an energy beam to form therein a tracking region for guiding a laser beam for recording and reprod... | 09/04/1990 |
| 4949331 | Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the... | 08/14/1990 |
| 4872156 | Record carrier with a preformed information track for recording information with a radiation beam A record carrier is described for optically writing and reading information, which record carrier is provided with a pre-formed track. This track is formed by a ridge disposedon the substrate surface and the recording layer comprises a dye layer having su... | 10/03/1989 |
| 4855991 | Optical disk having track offset detection areas An optical disk having a disk-like substrate and a recording layer provided on the substrate. First and second regions are alternately arranged along a rotational direction of the optical disk. The first region includes a pre-formed optically detectable p... | 08/08/1989 |
| 4796250 | Optical recording and reproducing apparatus including a disc extraction area for power setting a laser An apparatus for recording and reproducing data into/from an optical disc, which includes an optical disc having an optical recording medium into and from which data can be written and erased, a laser diode to write, erase, and read out data into and from... | 01/03/1989 |
| 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 |
| 4744074 | Disk-type recording medium A disk-type recording medium having circular or spiral tracks storing information. The tracks are radially and regularly spaced from one another. Each track has pregrooves (2), ridges, or protrusions, and discrete depressions (7,9), ridges, or protrusions... | 05/10/1988 |
| 4385303 | Optical recording and reproducing disc An optical recording and reproducing disc for recording and/or reproducing information by the application of laser beams having a wavelength λ in the range of 0.7 to 1.0 μm, the disc being constituted by a disc-shaped base having at least one spiral gui... | 05/24/1983 |
