73 results about "Compact Disc manufacturing" patented technology

A method for forming a stamper used in the manufacture of CDs, DVDs, and other types of optical disks comprises forming a substrate by rolling. A layer of material is deposited (e.g. by plating) onto the substrate. Thereafter, a resist layer is formed on the layer of material and patterned. Because the substrate is formed by rolling, it is relatively inexpensive to form the substrate to a desired thickness. Because the layer of material is formed by deposition (e.g. plating), it is relatively inexpensive to ensure that the layer has a very smooth surface (i.e. without necessitating a great deal of polishing).

Described herewith is an optical disk manufacturing apparatus for reading recorded digital data from an optical disk, comprising an encryption unit (22, 23) for encrypting entered digital data according to a plurality of key information; an optical disk substrate manufacturing unit 2 for manufacturing an optical disk substrate 4 on which the encrypted digital data and key information are recorded in the form of physical form changes; a reflection film forming unit 41 for forming a reflection film on the optical disk substrate 4; and a key information recording unit 7 for recording key information on the optical disk substrate on which the reflection film is formed. The reflection factor of the optical disk is changed locally, thereby giving a jitter to the position information of each pit edge, and desired data is recorded additionally according to this jitter. Pits, etc. are disposed so as to be deviated from the track center towards the inner / outer region of the optical disk 2, thereby recording such subdata as key information KY, etc.

An optical disk manufacturing method including a process of toroidally supplying a first resin on one side of a first disk substrate having an aperture at the center, in a region adjacent to the perimeter of the aperture; a process of rotating the first disk substrate provided with the first resin at a first rotational speed, and spreading the first resin; a process of curing the spread first resin in the surrounding vicinity of the aperture; a process of toroidally supplying a second resin that is superimposed on the first resin of the first disk substrate on which the first resin has cured, in the region adjacent to the perimeter of the aperture; a process of rotating the first disk substrate provided with the second resin at a second rotational speed, and spreading the second resin; and a process of curing the spread second resin.

A molding machine 1 which molds two sheets of disc substrates on which the information is recorded simultaneously, a cooling mechanism 3 for cooling each of the disc substrates, first movably mounting means 2 for movably mounting the disc substrate from the molding machine onto the cooling mechanism, and a second movably mounting means 4 for mounting each of the disc substrates onto a receiving portion of the turn table 5 are provided. In addition, a film forming device 8 for receiving sequentially each of the disc substrates from this movably mounting means 6 and forming a reflective film on one of the surfaces of each of the received disc substrates on which the information is recorded; a turn table 10 having a plurality of receiving portions on which the disc substrates are mounted and which rotates intermittently through each constant angle; a reversing mechanism 11 which reverses 180 degrees each of the disc substrates; and an overlapping mechanism for overlapping the reversed disc substrates over the other disc substrates are provided. Furthermore, spinners 15, 16 for rotating the overlapped two sheets of disc substrates and a curing device 23 which radiates ultra-violet rays onto the disc substrates which are rotated by the spinners to cure the liquid adhesive. According to the above-described structure, an optical disc which is compact, is fast in a production speed, and has a high quality can be achieved.

This manufacturing device for an optical disc includes: a disc-supporting base on which a disc substrate is mounted; a pin-shaped member arranged at a center of the disc-supporting base, and is movable in the vertical in a center hole of the disc substrate; and a capping member which is slidably placed on a top of the pin-shaped member, and closes the center hole of the disc substrate, wherein when the capping member placed on the top of the pin-shaped member is lowered such that a back face of the capping member contacts an around of the center hole of the disc substrate mounted on the disc-supporting base, the capping member slides on the top of the pin-shaped member.

In an optical disc fabricating apparatus, when the disc substrate is lowered from the tip of a disc inserting portion at a center pin down to a disc supporting portion, a disc urging portion of an alignment lever is pressed by a disc substrate, to be thus pushed in toward an inner periphery and a sheet urging portion is pushed out toward an outer periphery, so as to press the inner peripheral surface of a cover sheet so that both of the cover sheet and the disc substrate are urged in an alignment direction. Thus, it is possible to eliminate play generated between the inner peripheral surface of the cover sheet and the outer peripheral surface of a sheet inserting portion and play generated between the inner peripheral surface of the disc substrate and the outer peripheral surface of the disc inserting portion.

According to a first aspect of the present invention, a recording medium manufactured without using the latest key management information can be detected and accuracy of content protection can be improved. A license association apparatus generates a digital signature uniquely corresponding to the latest key management information and content data. A disc manufacturer apparatus writes this digital signature together with the key management information, encrypted content, content feature information onto a DVD. Accordingly, the recording media manufactured without using the latest key management information can be detected by confirming unique correspondence among the key management information, the content feature information and the digital signature and unique correspondence between the encrypted content and the content feature information, in advance of playback.

An optical disc-producing sheet 1, which has an adhesive layer 11 having a specific heat capacity after curing of not more than 1.9 J / g. DEG C at 80 DEG C and a protective sheet 12, is laminated onto an information recording layer 3 (a laminate of a reflecting layer 31, a dielectric layer 32, a phase change layer 33 and a dielectric layer 32') formed on an optical recording medium substrate 2. According to this optical disc, recorded information can be reproduced accurately even in the case that recording / erasure or reproduction of information has been carried out repeatedly.