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| Number | Title | Issue Date |
| 7610595 | Clamping plate, cartridge case, information medium, mold, and method of manufacturing clamping plate A clamping plate capable of reliably clamping a disk-shaped medium. In the clamping plate, at an imaginary intersecting portion between an imaginary extended surface of a rear surface of an outer peripheral portion of a main body and an imaginary extended surface of... | 10/27/2009 |
| 7380257 | Optical information recording medium An optical information recording medium has tolerance to warping. The optical information recording medium includes at least one information recording layer on a main surface of a substrate and a light-transmitting layer. The substrate includes a clamp area and an i... | 05/27/2008 |
| 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 |
| 7295508 | Optical disk The present invention provides an optical disc which is constituted by a substrate, a recording layer, and a protection layer and is irradiated with a laser beam from the protection layer side. The optical disc has the substrate whose diameter is greater than 50 mm,... | 11/13/2007 |
| 7263706 | Disk cartridge and disk player using the same A disk cartridge includes a case accommodating a disk, a cover installed at the case to be capable of being open and shut and having a hole formed thereon to be open to an outside of the cover, a shutter installed under the disk in the case to be capable of moving t... | 08/28/2007 |
| 7258907 | Optical disk The present invention discloses an optical disk formed according to double injection molding of forming an area of the optical disk on which a recording film is formed, namely, an outer circumferential area by using polycarbonate that is an amorphous polymer, and fo... | 08/21/2007 |
| 7228554 | Cartridge type recording medium and disk-shaped recording medium including a hole for centering each thereof, cartridge, driving unit and driving method The object of the present invention is to provide a technology which has high compatibility and can provide users with conveniences. A new system recording medium 100 has a center hole 112 formed on a recording disk 110 and a center hole 121 | 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 |
| 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 |
| 7194750 | Recording/reproducing apparatus and disk cartridge A disk surface of an optical disk is divided into two regions by a straight line being close to a movement line for an optical pickup to scan and passing in the vicinity of a center of the optical disk. An auxiliary stabilizing member is arranged separately from a m... | 03/20/2007 |
| 7138165 | Intermediate for optical recording medium, mold, molding apparatus, and method of manufacturing optical recording medium There is provided an intermediate for an optical recording medium, which can be uniformly coated with resin by the spin coating method without using a resin coating-assisting member, and allows formation of a central mounting hole without burrs. The intermediate com... | 11/21/2006 |
| 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 |
| 6941572 | Optical information recording medium and optical information recording/reproduction apparatus It is an object to provide an optical information recording medium including a substrate (1) and an optical information layer in one of the layers the substrate (1) and having a light incident surface on at least one of the surfaces of the substrate si... | 09/06/2005 |
| 5859834 | Optical disc with magnetic member in a recessed portion thereof and method for producing said optical disc An optical disc includes a disc base plate of a light-transmitting synthetic material having a recess for mounting a magnetic plate, and a holding part, integral with the disc base plate, for loosely holding the magnetic plate mounted in the recess with r... | 01/12/1999 |
| 5709764 | Method for assembling a disc-shaped recording medium A method and apparatus for assembling a hub for magnetically chucking an optical disc on a disc table of a recording/reproducing apparatus under a force of magnetic attraction includes an assembly guide member having a first guide portion movable in a dir... | 01/20/1998 |
| 5590115 | Optical disk and apparatus for manufacturing the same In an optical disk according to the present invention, a part of a disk is heat pressed to thereby connect a clamping plate to the central part of the disk. The heat pressed part of the optical disk is heat pressed into a discontinuous form during connect... | 12/31/1996 |
| 5541910 | Optical disk substrate and optical disk using the same An optical disk substrate of resin, comprising a center hole and being composed of an inner circular-projected portion and an outer flat circumferential portion, the inner circular-projected portion having a circular projection projecting from at least on... | 07/30/1996 |
| 4871404 | Method for producing an optical information recording disk A method for manufacturing an optical information recording disk having a reduced eccentricity between the center hole of the disk and the recorded track. A transparent circular substrate is provided having a large circular hole. A metal lamination disk m... | 10/03/1989 |
| 4847826 | Disk cartridge A disk cartridge includes a clamper of synthetic material rotatably mounted to a disk cartridge half and a magnetic plate secured to the clamper, is disclosed. According to the invention, a plurality of projections are formed in the magnetic plate. The cl... | 07/11/1989 |
| 4841517 | Disk clamping device A disk clamping device for clamping either one of a disk having a small center hole, such as a compact disk, and a disk having a larger center hole, such as a video disk, to a turntable with which the diameter of the turntable can be increased to reduce t... | 06/20/1989 |
| 4787009 | Optical disk An optical recording and/or reproducing disk includes a disk substrate and a chucking hub, in which the chucking hub is formed of a synthetic resin ring having formed on its lower surface a welding portion and on its upper surface a ultrasonic welding hor... | 11/22/1988 |
