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| Number | Title | Issue Date |
| 7505394 | Flexible membrane comprising notches The flexible membrane comprises at least one thin layer with a plurality of indentations formed therein, wherein bearing points for actuating elements are disposed between said indentations in order to locally deform the membrane. The thus open-worked membrane is mo... | 03/17/2009 |
| 7212489 | Optical disc and method of protecting same An optical disc for storage and retrieval of digital data, and a system and method for protecting the optical disc is disclosed. The optical disc has projections or embossments on one or both surfaces. When the optical disc is placed on a substantially flat surface ... | 05/01/2007 |
| 7161894 | Optical recording article Optical recording articles, such as tapes, and methods of making and using such articles are disclosed. ... | 01/09/2007 |
| 6967050 | Optical recording medium and a method of manufacturing the same Constructed is an optical recording medium which is so formed as to have excellent surface flatness and with respect to which information is recorded or reproduced with the use of a near-field optical system. The optical recording medium is one which performs at lea... | 11/22/2005 |
| 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 |
| 6789262 | Data storage medium with stepped winding core A data storage medium includes an information carrier wound onto a winding core in a spiral manner for optically readable information units. The winding core is configured in a spiral manner on its outer contour and has a step. The height of the step is matched to t... | 09/07/2004 |
| 6106657 | System and method for dispensing a resin between substrates of a bonded storage disk A system and method dispense resin between substrates. A top substrate device holds a top substrate concave up. A bottom substrate device holds a bottom substrate concave down. A resin dispensing device has a needle and dispenses a trajectory of resin def... | 08/22/2000 |
| 5620765 | Aqueous backing for digital optical media Flexible digital optical media, such as optical tapes, are provided with an aqueous-applied backing layer which provides excellent performance with regard to runnability, scratch resistance, abrasion resistance, frictional properties and curl characterist... | 04/15/1997 |
| 5538774 | Internally damped rotatable storage article The present invention provides a method for internally damping a rotatable storage article which is subject to resonant vibrations. More specifically, the present invention provides a method of improving the damping properties of a rotatable storage artic... | 07/23/1996 |
| 5534385 | Overcoat for optical tape having SbInSn recording layer There is disclosed a flexible optical recording element comprising a flexible support having thereon, in order, an SbInSn phase-change alloy optical recording layer and an overcoat layer, the overcoat layer being a silicon oxide layer having an index of r... | 07/09/1996 |
| 5468593 | Optical recording medium A tape-shaped optical recording medium, in which a recording layer capable of optically recording or reproducing information signals is formed on a flexible base, is disclosed. A protective film formed of a soluble high polymer having a contact angle with... | 11/21/1995 |
| 5278712 | Removable disk drive having two heads formed with a gimbal structure A removable disk system includes a disk which can be recorded on both surfaces thereof and a disk drive for recording input data on tracks on both surfaces of the disk. The disk drive includes head means having two heads for recording information on both ... | 01/11/1994 |
| 4888266 | Process for producing information supports capable of being optically read by variations in absorption The invention relates to a process for producing supports intended for the optical recording and reading of information. A layer containing a diazo compound is deposited onto a metallized substrate. Recording is obtained by exposing the support to light t... | 12/19/1989 |
| 4641152 | Fixturing apparatus for vibration dampened optical disc recording Apparatus for fixturing an optical recording disc in a DRAW recording machine comprising a hub having a conical shoulder for receiving and locating the disc center opening, and an axially facing shoulder for nesting support of the recording disc. A retain... | 02/03/1987 |
| 4623570 | Stable stretched surface recording medium Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in... | 11/18/1986 |
| 4616238 | Information recording medium of air-sandwich structure In an information recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given space by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer fo... | 10/07/1986 |
| 4613966 | Sealed encapsulation for floppy disk using centrifugal force to flatten disk An optical floppy disk system is described in which the optical disk is enclosed in a flexible housing which is optically transparent. Both the optical disk and its protective housing can be made at very low cost from inexpensive materials. The disk is en... | 09/23/1986 |
| 4607264 | Recording medium of deformable air-sandwich structure A recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given distance by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer for writing and... | 08/19/1986 |
| 4556968 | Unconstrained removable protective cover for optical disk An unconstrained removable protective cover for optical disks. With this apparatus a transparent protective cover can be mounted to an optical information recording disk wherein the different thermal expansion coefficients of the disk and the protective c... | 12/03/1985 |
| 4553232 | Clamping device for optical disk assemblies A device is disclosed for clamping disk assemblies in a manner to impart constant tension to a support web and cover sheet, while assuring easy and quick loading and unloading of the assembly. The optical disk assembly includes a web assembly including a ... | 11/12/1985 |
| 4550396 | Retaining rings for optical disk assemblies An optical disk assembly includes a web assembly having a flexible disk-shaped support web carrying a record layer. The support web has an information storage region. A pair of annular retaining ring members engage opposite sides of an annular peripheral ... | 10/29/1985 |
| 4546465 | Optical disc assembly retaining rings An optical disc assembly includes a flexible disc-shaped support carrying a record layer. The support has an information storage region. A pair of annular retaining ring members engage opposite sides of an annular peripheral region of the support as the r... | 10/08/1985 |
| 4539573 | Protective construction for optical disk units An optical disk unit, of the kind having a record element and a flexible cover sheet that are attached around an outer periphery in a manner providing an outer spacing and a generally enclosed inter-space therebetween, has an improved construction which s... | 09/03/1985 |
| 4539673 | Optical disc air separation method and device An optical disc structure including two resilient disc members which are bonded together adjacent their outer peripheries and which include an air channel allowing communication between the chamber formed between the discs and the atmosphere. An informati... | 09/03/1985 |
| 4536869 | Optical disk assembly An optical disk assembly includes a flexible disk-shaped support carrying a record layer. The support has an information storage region. An annular retaining ring engages the annular peripheral region of the support. The support, and preferably a cover sh... | 08/20/1985 |
| 4525829 | Optical disk assembly retaining rings An optical disk assembly includes a web assembly having a flexible disk-shaped support web carrying a record layer. The support web has an information storage region. A pair of annular retaining ring members engage opposite sides of an annular peripheral ... | 06/25/1985 |
| 4510508 | Optical disc pressure-collapsible cover An optically readable storage disc comprises a transparent substrate 1 on which a recording layer 2 is deposited which can be modified locally by means of a radiation beam, which recording layer is covered by a cover disc 3 which is secured to the substra... | 04/09/1985 |
| 4510279 | Methacrylate resin composition for optical information recording medium A methacrylate resin composition for optical information recording medium, excellent in releasability from mold, consisting of (A) 100 parts by weight of a methacrylate resin and (B) 0.1 to 3.0 parts by weight of a surface active agent having a fluoroalky... | 04/09/1985 |
| 4509163 | Process for producing a low hygroscopic methacrylic resin and information recording substrates made therefrom A methacrylic resin having reduced water absorption properties, useful in optical instruments and as information recording substrates, is produced by polymerizing a mixture consisting of (A) 50 to 85% by weight of a methyl methacrylate, (B) 15 to 50 by we... | 04/02/1985 |
| 4507774 | Optical disc and disc-turntable air flow interface assembly Optical disc write/read apparatus and systems of the type having a flexible record disc and turntable which interface in a manner forming a generally enclosed space between record portions of the disc and opposing turntable portions is provided with inner... | 03/26/1985 |
| 4482903 | Disk unit with retaining ring This disclosure relates to an optical disk unit with two states in which the web assembly is in different circumferentially-symmetric tensions. One tension is sufficiently great to provide the desired degree of planarity when used with write/read apparatu... | 11/13/1984 |
| 4470054 | Optical disc write/read apparatus with disc mounting means An optical disc assembly for use with optical disc apparatus includes a flexible disc-shaped support. An annular retaining ring engages the support around its periphery. The support carries a record layer with an information storage region. Cooperating op... | 09/04/1984 |
| 4453246 | Retaining rings for optical disc assemblies An optical disc assembly includes a record layer carrying, flexible disc-shaped support with an information storage region. An annular retaining ring comprising an inner and an outer member clamps an outer peripheral portion of the support as the ring mem... | 06/05/1984 |
| 4449139 | Optical disc unit, fabrication method and cooperating write and/or read apparatus An optical disc-unit including (i) a flexible, disc-shaped support bearing a record layer, (ii) a flexible disc-shaped cover sheet which is transparent to write/read light and (iii) annular retaining means which engage the support and sheet, in spaced rel... | 05/15/1984 |
| 4365258 | Optical disc unit, fabrication method and cooperating write and/or read apparatus An optical disc-unit including (i) a flexible, disc-shaped support bearing a record layer, (ii) a flexible disc-shaped cover sheet which is transparent to write/read light and (iii) annular retaining means which engage the support and sheet, in spaced rel... | 12/21/1982 |
| 4335173 | Method and means for reducing undesirable effects of dirt particles on a flexible record device Methods and means for reducing undesirable effects of dirt particles on a flexible record device are disclosed. These undesirable effects are alleviated in accordance with the present invention by using a multilayer cushioning device to absorb the effect ... | 06/15/1982 |
| 4320833 | Cartridge for a video-disk, and video-disk suitable for such a cartridge A cartridge for enclosing a video-disc, which comprises a sleeve and a tray. The video-disc is located into a cavity hollowed in the tray and secured to the bottom of this cavity along a circular central zone through the medium of a plurality of magnetic ... | 03/23/1982 |
| 4222070 | Recording video information on a flexible master disc Video information is commonly recorded on a master record device such as a video disc by focussing a modulated recording beam on the master disc and rotating the disc relative to the focussed recording beam. During exposure, the recording beam travels acr... | 09/09/1980 |
| 4071854 | Device for the stabilization of flexible discs and more particularly of videodiscs and reading apparatus adapted to this device An apparatus for reproducing information on a flexible video disc in which the disc is accurately positioned facing the transducer head by structure including a fixed plate for prestabilizing the disc in rotation to a substantially constant distance in re... | 01/31/1978 |
| 4066268 | Disc recording provided with legible matter In the production of disc recordings, the label portion therefor is formed by tracing a pattern of essentially circular grooves or arrays of dots and groove or dot-free areas in the location of the label portion, the grooved areas contrasting visually wit... | 01/03/1978 |
