Class / Patent application number | Description | Number of patent applications / Date published |
369277000 | Special groove (e.g., particular groove shape) | 7 |
20080247304 | INFORMATION RECORDING MEDIUM - According to one embodiment, when recording information by using a semiconductor laser at 450 nm or less, an information recording medium satisfies | 10-09-2008 |
20080316908 | Information recording carrier and method of reproducing the same - An information recording carrier according to one embodiment has minute pattern including plural grooves or lands formed to be substantially in parallel and adjacent each other and comprises a supporting body having the minute pattern, a recording layer formed on the minute pattern formed on the supporting layer and a light transmission layer formed on the recording layer. The minute pattern is formed under a relation of P<λ/NA, where a pitch of each groove or land is P, a wavelength of a laser beam is λ and a numerical aperture of an objective lens is NA. The plural grooves or lands have at least a wobbling region and data is recorded wobblingly in the wobbling region by frequency shift modulation. A phase relation between a high frequency portion and a low frequency portion composing the frequency shift modulation is ±(π/20.5) to ±(π/0.75). The data is also recorded wobblingly in the wobbling region by bi-phase modulation. | 12-25-2008 |
20090010147 | OPTICAL DISK AND MOLDING DIE APPARATUS - A stamper is mounted to a surface of at least one of a stationary-side die and a movable-side die. A transfer surface of the stamper is positioned substantially flush with a first surface of an inner peripheral holding member for holding the stamper near an inner periphery thereof which first surface is positioned adjacent to the transfer surface of the stamper. A first distal end of the inner peripheral holding member, which is positioned to face the cavity, and a second distal end of a die member, which is positioned to face the cavity, the die member being disposed adjacent to the inner peripheral holding member, are both projected more into the cavity than the transfer surface of the stamper. A molding burr can be suppressed from projecting upward from the vicinity of an inner peripheral edge of the substrate surface substantially flush with the transfer portion. | 01-08-2009 |
20100067360 | 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 replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands. | 03-18-2010 |
20100220582 | DISC-SHAPED INFORMATION-CARRYING MEDIUM - The present invention relates to disc-shaped information-carrying media for storage and reproduction of audio-, video- and other types of information in a digital form. The disc-shaped information-carrying medium comprises at least a substrate with a matching bore in its central area for locking said medium in a reading device, said substrate having a first side and a second side opposite thereto, on at least said first side of said substrate a first information area is provided for information storage and/or recording and reading such information using a laser beam. According to a first embodiment said substrate thickness at least within said first information area does not exceed 0.8 mm, said substrate central area is provided with N>1 ending protrusions projecting over said substrate first side and facilitating locking said medium in a reading device drive. According to a second embodiment in addition to said N protrusions on said first side, a circular recess is provided within said central area on said substrate second side, limited between the diameters of 15 mm and 22 mm. According to a third embodiment in addition to said N ending protrusions, a flat circular protrusion is provided within said central area on said substrate second side, limited between the diameters of 15 mm and 40 mm. According to a fourth embodiment said substrate comprises two flat circular protrusions provided in the general cased within the diameters of 15 mm and 40 mm, one protrusion on each substrate side. This configuration of the medium ensures its compatibility with most of modern optical media reading/recording devices, capability of storing and/or recording and/or rewriting 4.7 Gb of information and more, low birefringence and read/write error rate. | 09-02-2010 |
20130094343 | INFORMATION RECORDING MEDIUM, INFORMATION REPRODUCTION APPARATUS AND INFORMATION RECORDING APPARATUS - According to one embodiment, an information recording medium characterized by including, a first servo layer, a second servo layer, and a data layer, the information recording medium further including, a first spiral track and a second spiral track formed between the first servo layer and the second servo layer and spiraling in opposite directions. | 04-18-2013 |
20130148487 | OPTICAL DISC WITH A DISCONTINUOUS SURFACE STRUCTURE - Disclosed herein is an optical disc having an information area situated between an internal edge and an external edge of the optical disc. The optical disc includes a first substrate, a second substrate, a recording layer, a reflecting layer and a number of surface structures. The second substrate is disposed over the second substrate, the recording layer and the reflecting layer are disposed between the two substrates, and the reflecting layer is disposed between the first substrate and the recording layer. The surface structures are discontinuously disposed on the surface of the second substrate. | 06-13-2013 |