Abstract:
A method of manufacturing an optical disc includes easily removing a bump formed on a circumference of the optical disc during forming a transparent layer by using a spin-coating method to form the optical disk having a high-density recording capacity. The method includes preparing a substrate having a diameter larger than that of a desired disc, applying an ultraviolet hardening resin to the substrate and forming a transparent layer having a predetermined thickness by a spin-coating method, illuminating an ultraviolet ray on the transparent layer and a bump formed on a circumference of the transparent layer to be hardened, and cutting out the bump by using a puncher. According to the method, the bump which inevitably occurs when the transparent layer is formed, can be easily cut out by a puncher.
Abstract:
An apparatus and method to manufacture a disc include a spindle table, a spin coating portion coating a resin onto a disc substrate mounted on the spindle table, and a resin hardening portion hardening the resin, which is coated onto the disc substrate, where the disc substrate is mounted on the spindle table.
Abstract:
An optical disk for a mobile device is provided. The optical disk includes a substrate, having an outer diameter less than 120 mm and not smaller than 30 mm and a thickness less than 1.1 mm and not smaller than 0.40 mm, so that a deflection angle of 0.7null or smaller can be obtained. Alternatively, the optical disk includes a substrate, having an outer diameter not smaller than 30 mm and a thickness not smaller than 0.435 mm, so that a deflection angle of 0.6null or smaller is obtained.
Abstract:
A disc is produced using a method of and an apparatus for forming a transparent layer on a disc substrate. The method for forming the transparent layer on the disc substrate includes covering an axial hole formed at a center of the disc substrate with a cover element by inserting a protrusion of the cover element in the axial hole of the disc substrate so that a resin does not leak through the axial hole, dispensing the resin toward the center of the disc substrate from an upper side of the disc substrate, and removing the cover element. A more uniform transparent layer can be obtained throughout the disc substrate.
Abstract:
A light-curable resin composition includes an acrylate oligomer, an acrylate monomer having 4 or less functional groups, a photopolymerization initiator, a hardness enhancing agent represented by the formula(1), m-terphenyl represented by the formula(2) and a colloidal antistatic agent. The light-curable resin composition has a high antistatic property and a light transmittance, as well as a high hardness and a low shrinkage rate.
Abstract:
A method of manufacturing an optical disk includes spin-coating a substrate with a resin to form a light transmission layer without an additional cover. A spindle jig, which has a central shaft and is formed of a non-adhesive substance, is prepared. A resin is discharged on a surface of the spindle jig. The substrate is placed on the resin so that a recording layer of the substrate faces the spindle jig, and the substrate is spun to form the light transmission layer from the resin. The substrate, which is coated with the light transmission layer, is separated from the spindle jig. Accordingly, the resin is discharged not on a center of the substrate but around the center of the substrate. Thus, the additional cover is unnecessary, and thus a process of manufacturing the optical disk is simplified. Also, an entire surface of the substrate can be uniformly coated with the light transmission layer using the spindle jig and/or a dummy substrate formed of non-adhesive substances.