71 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).

Sub-information necessary to reproduce main information is recorded without deteriorating the reading accuracy of the main information, so that the illegal duplication of an optical disc is prevented. An optical disc 1 is produced by forming a reflective film 1L on concave and convex marks MK after the concave and convex marks MK synchronized with the integral multiple of a channel bit length are formed in accordance with modulated main information. Thereafter, continuous or intermittent laser light synchronized with the integral multiple of the channel bit length is irradiated at intervals longer than the longest one of the concave and convex marks MK in accordance with a spiral track formed in a circumferential direction of the concave and convex marks MK, whereby an optical characteristic of the reflective film 1L is changed to form a recordable mark SMK and sub-information necessary to reproduce the main information is recorded in a superimposition manner.

The method of the present invention includes an exposing step in which a laser beam for recording modulated by an information signal corresponding to an information signal of an information concave and convex pattern formed on the optical disc is applied to an inorganic resist layer 101 formed on a substrate 100 to form an exposed pattern corresponding to the information concave and convex pattern on the optical disc, and a development step in which a concave and convex pattern corresponding to the information concave and convex pattern by the inorganic resist layer is formed. By applying a laser beam for estimation to a predetermined area on the inorganic resist layer in the exposing step to estimate recorded signal characteristics of the exposed pattern by the inorganic resist layer using reflected light of the laser beam for estimation, and controlling power of the laser beam for recording based on the estimated result, the aimed information recording on the optical disc can reliably be obtained.

An optical disk (10) of the present invention has a substrate (11) included a resin-impregnated paper, in which resin is impregnated into paper, or resin-coated paper, in which the paper surface is coated with a resin, and a recording layer (13) formed on at least one side of the substrate (11). This type of optical disk (10) has performance equal to that of conventional optical disks and has a minimal effect on the environment during disposal. In addition, a manufacturing method of an optical disk of the present invention has a recording layer sheet fabrication step in which a recording layer sheet is fabricated by forming tracks on a recording layer base material, and a recording layer sheet lamination step in which a recording layer (13) included the recording layer sheet is provided on a substrate (11) included resin-impregnated paper or resin-coated paper by laminating the recording layer sheet with the resin-impregnated paper in which a resin is impregnated into paper or the resin-coated paper in which the surface of the paper is coated with a resin. This type of manufacturing method of an optical disk allows optical disk (10) to be produced inexpensively.

The present invention provides a spin coater including a rotation table that rotatably holds the disc substrate, a spin-cup that surrounds the outer circumference of a disc substrate held on the rotation table, a dripping unit configured to drip an ultraviolet-curable resin composition onto the surface of the disc substrate, a rotating unit configured to rotate the disc substrate via the rotation table to spread the ultraviolet-curable resin composition over the surface of the disc substrate, a heating unit configured to heat the ultraviolet-curable resin composition on the disc substrate, and a temperature controlling unit configured to control a reaching temperature of the spin cup which is increased by the heating unit each time the ultraviolet-curable resin composition is spread, so as to be constant over multiple spin coating processes.

In a recording system (1), a personal computer (20) reads out boot information from an optical disc (31) in a predetermined order and records elements of the boot information in contiguous areas on the optical disc (32). In order to thus operate, the personal computer (20) refers to access records before reading out the boot information from the optical disc (31). The access records are generated by a protocol analyzer (11) at a start-up of a personal computer (10). Further, for each of the elements indicated by the access records, the personal computer (20) records, on the optical disc (32), an address conversion table in which that area on an optical disc (31) in which the element is recorded and that area on the optical disc (32) in which the element is recorded are correlated with each other.

A manufacturing method of an optical disk in which information recording layers are formed onto a resin layer laminated on a substrate surface. The substrate surface is coated with the resin layer. The substrate and a stamper are arranged into a vacuum chamber so that the resin layer surface and the stamper surface with concave/convex portions face almost in parallel. The chamber is set into an almost vacuum state while holding the facing state of the substrate and the stamper. The chamber is changed from the almost vacuum state to an atmospheric pressure or higher. The substrate and the stamper are overlaid. The stamper is pressed by a differential pressure between the almost vacuum pressure and the atmospheric pressure or higher, thereby adhering the substrate and the stamper and transferring the concave/convex portions to the resin layer. The resin layer with the transferred concave/convex portions is hardened.

An apparatus and method for controlling radial runout between stacked disk portions (14, 18) and providing a cylindrical pin (20) having at least two diameters (22, 24). The pin is dimensioned and configured to permit the disk portions, which have different center hole dimensions, to be indexed such that a center hole of each disk portion is received by a separate diameter of the pin. The disk portions are maintained in spatial relationship as provided by the pin by spot curing a portion of the adhesive.

It is made possible to fabricate a bit-patterned magnetic recording medium having a high recording density and making favorable address deciphering possible. An original disk fabrication method for irradiating a photosensitive resin film with an electron beam to draw a pattern, the method includes: irradiating the electron beam by using a plurality of blanking signals every rotation of a stage per bit unit, when drawing the pattern in a part corresponding to an address part on a photosensitive resin film.

An optical disc having a region with pre-recorded data and a recordable region, a method of fabricating the disc, a stamper for forming a disc master, and a recording device for use with the disc are disclosed. Data recorded in the recordable region may be used for activation of the disc, providing unique identification or enhancing program content on the disc.

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.

A hub-mounted optical disk to eliminate the need for a separate stack ring while decreasing the overall height, a method of fabricating the optical disk, and an injection molding die for manufacturing an optical disk substrate. The hub-mounted optical disk includes a substrate having a hollow and an indented portion engraved to a predetermined depth on the inside of a non-recording surface where no information is recorded; and a hub including a plate that has a fitting hole therein and is engaged into the hollow and the indented portion and a central ring that is inserted into the fitting hole. The method of fabricating the hub-mounted optical disk includes mounting the hub onto a magnetic chuck, applying an ultra-violet (UV) hardening resin on the indented portion of the substrate, operating the magnetic chuck so that the plate is in contact with the indented portion, and curing the UV hardening resin by irradiating it with UV light. The injection molding die for manufacturing the optical disk substrate includes a stationary plate having an injection nozzle that allows resin forming the substrate to be injected, a stamper that has a predetermined information recording pattern, and a moving plate having a projecting portion at the center.