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7458088 |
Intermediate for optical recording medium and method of manufacturing the optical recording medium
An intermediate for an optical recording medium, according to the present invention, is an intermediate produced beforehand for manufacturing an optical recording medium that has a central mounting...
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7055162 |
Optical information medium and making method
An optical information medium includes a disk-shaped substrate ( 100 ) having a center hole ( 101 ), an annular information recording area thereon, and an annular resin-based light-transmitting...
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6898796 |
Optical information medium and making method
An optical information medium includes a disk-shaped substrate ( 100 ) having a center hole ( 101 ), an annular information recording area thereon, and an annular resin-based light-transmitting...
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6865745 |
Methods and apparatus for reducing the shrinkage of an optical disc's clamp area and the resulting optical disc
An improved optical disc is provided that comprises a substantially transparent substrate, one surface of which carries optical data structures comprising pits and lands radially outward of a clamp...
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6832384 |
Turntable assembly having disc centering lead springs clamped between upper surface of turntable and an insert-type spring holder
A turntable assembly not requiring use of plastic centering hooks, enabling simplification of the mold structure, and enabling attachment of the leaf springs imparting elastic spring force in the...
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6779193 |
Digital data storage assembly with particular hub adaptor
A digital data storage assembly ( 2 ), e.g., a flexible thin film compact disc, is described. Digital data storage assembly ( 2 ) includes, (a) a thin film data storage carrier ( 11 ), having...
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6584067 |
Optical recording medium having a recording/reproducing area with a shaped region
An optical recording medium wherein a land and a groove are formed in both front and rear surfaces of a circular disk-like substrate respectively, at least a recording layer and a dielectric layer...
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6236638 |
Device to install compact disk media write protect device
The present invention is a device and method to install a compact disk media write-protect ring 104. The device 200 positions the write-protect ring 104 so that it is aligned with the center hole...
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5883880 |
Disk positioning device for defining precise radial location
A spindle for providing precise radial location of a disk includes a spindle having a key that extends from one end thereof. The disk includes a hub having a shape that is similar to that of the...
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5867477 |
Optical disk with snap-fit magnetized hub
An optical disk is equipped with a hub which is very easy to attach and detach. The hub has a bottom and a cylindrical wall which projects upwards from the bottom, and which is inserted in the...
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5717684 |
Disk cartridge having chamfered wall portion
A disk cartridge with a case comprises upper and lower shell halves, each of which has a head insertion hole and a spindle insertion hole. A pair of projections are provided inwardly at a joint...
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5265087 |
Information medium with improved temperature characteristics
An information memory medium (10) includes disk-shaped substrates (30a, 30b) and recording layers (32a, 32b). It also has a centering member (38a, 38b) whose coefficient of thermal expansion...
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5072438 |
Optical information recording disc and apparatus for driving the disc
An optical information recording disc having at least one substrate for recording/reproducing information through an optical unit wherein a spindle hole, through which a spindle is provided as a...
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4944982 |
Information recording medium having magnetizable hub
An information recording medium for writing and/or reading information by means of a laser beam comprises an information recording disc and a magnetizable hub. The information recording disc has a...
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4926410 |
Disk
A disk includes a substrate of the disk provided with a recording medium to and from which information signals are recorded and/or reproduced, and a disk hub provided with a metal plate formed with...
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4903224 |
Optical information recording disk
An optical information recording disk having an improved eccentricity and reduced center hole wear. A metal plate lamination hub member is inserted into and fixed in a central hole in the substrate...
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4866697 |
Information memory medium
An optical disk comprising a disk-like body having two base plates made of synthetic resin and two recording layers formed on the base plates, respectively. The body is formed by bonding the base...
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4829510 |
Disk for recording and/or reproducing apparatus having magnetic chucking device
An optical disk is disclosed in which a disk hub is constituted by a disk-like metal plate having a plurality of engaging projections formed on its outer periphery by the stepping operation and a...
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4686666 |
Flexible micro disk
A micro disk for data storage has a media portion of flat circular shape with a central opening therein. A hub portion has a pilot protrusion that interfits with the central opening to mechanically...
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4545047 |
Centering device for interchangeable disk
A centering mechanism for centering the disk recording medium over the spindle of a rotating disk storage system is presented. The invention consists of a centerpiece in the disk having three or...
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