Abstract: A method for manufacturing an optical disc. The method includes the steps of peeling a release paper from a four layered adhesive sheet member, which is composed of an elongated release paper, a protective sheet attached to the release paper, an adhesive layer formed on the protective sheet, and a release paper formed on the adhesive layer. A three layered adhesive sheet member which results from the peeling of the release paper is applied to the single layered disc, the protective sheet is transferred and bonded to the surface of the single layered discs and the elongated release paper is peeled off from the protective sheet bonded to the single layered disc to expose the protective sheet on the upper side of the single layered disc.

Abstract: A high quality optical disc with extremely tiny bubbles or bubble less present in both disc-shaped substrates when they are laminated by means of an adhesive sheet in a operation process. The method includes bonding the adhesive agent to the surface of the lower disc-shaped substrate placing the upper disc-shaped substrate on the adhesive applied to lower disc-shaped substrate, pressurizing the upper disc-shaped substrate against the lower disc-shaped substrate by means of the pressing body, and exposing both the disk-shaped substrates to a high-pressure atmosphere. In a next operation process in which both the disc-shaped substrates are left to the inside of a high pressure atmosphere, firstly pressing body is permitted to press against the disc-shaped substrates to so enlarge or magnify the contact portion from the center side to the outside to render high-pressure atmospheric.

Abstract: A peeling apparatus including a holding table adapted to carry an optical disc composed of upper and lower disc-shaped substrates laminated to each other, a boss disposed centrally of the holding table which allows gas to blow between the disc-shaped substrates, and a suction means peripherally of the holding table to suck pulverized adhesive dust exhausted from the disc-shaped substrates when the two disc-shaped substrates are peeled from one another. The suction means is provided with a suction groove so formed to correspond to the periphery of the two disc-shaped substrates, and the holding table is provided with sucking and holding means for sucking and holding the two disc-shaped substrates.

Abstract: An adhesive agent is applied to both single plates, upper and lower, in which case the formation of bubbles is minimized by using a specified application manner. A method of laminating optical disks (D) comprising the steps of placing a lower disk single sheet (D1) on a turntable (1), applying an adhesive agent (R1) in doughnut form to the lower disk single sheet (D1), placing an upper disk single sheet (D2) on another turntable (2), applying an adhesive agent (R2) in doughnut form to the upper disk single sheet (D2), placing the upper disk single sheet (D2) on the lower disk single sheet (D1), and spreading the adhesive agent (% 2) between the two disk single sheets by rotating the turntables. Since bubbles hardly enter the adhesive agent, the bubble content of the adhesive agent after spreading is very small, and even after the curing subsequent to ultraviolet ray radiation, the air content of the optical disk can be minimized, the quality being high.

Abstract: This invention is purported to provide a method for manufacturing an optical disc in a simple and uniformly a protective layer on a single layered disc.

Abstract: This invention is purported to provide a method and an apparatus for precisely peeling both of disc-shaped substrates by a simple device without requiring a great peeling force.

Abstract: A method of and apparatus for curing an optical disc capable of efficiently curing ultraviolet curing resin serving as an adhesive between a pair of disc substrates. The apparatus includes a peripherally located ultraviolet irradiation unit disposed around a rotary holding table for irradiating ultraviolet from the peripheral surface of the optical disc toward the inner portion thereof so as to cure the ultraviolet curing resin, and/or a central irradiation unit disposed to irradiate ultraviolet from the central hole of the optical disc toward the outer portion thereof.

Abstract: A high quality optical disc with extremely tiny bubbles or bubble less present in both disc-shaped substrates when they are laminated by means of an adhesive sheet in a operation process. The method includes bonding the adhesive agent to the surface of the lower disc-shaped substrate placing the upper disc-shaped substrate on the adhesive applied to lower disc-shaped substrate, pressurizing the upper disc-shaped substrate against the lower disc-shaped substrate by means of the pressing body, and exposing both the disk-shaped substrates to a high-pressure atmosphere. In a next operation process in which both the disc-shaped substrates are left to the inside of a high pressure atmosphere, firstly pressing body is permitted to press against the disc-shaped substrates to so enlarge or magnify the contact portion from the center side to the outside to render high-pressure atmospheric.

Abstract: There is provided a method of curing an optical disc capable of effectively curing the optical disc without generating a warp phenomenon when optical disc is cured while ultraviolet curing resin material is irradiated with ultraviolet. The method of curing an optical disc comprises overlaying first and second resin substrates onto each other by way of an adhesive made of ultraviolet curing resin material, the method further comprising clamping the optical disc by ultraviolet transmittance plates at both sides thereof, and curing the adhesive while being irradiated with ultraviolet from outside of the ultraviolet transmittance plates.

Abstract: A developing storage disc boss adapted to engage a recess in a rotatable holding table for developing a storage disc including two discoid resin substrates with adhesive contained in a space therebetween. The developing storage disc boss includes a barrel portion for the engagement and a suction cylindrical portion that extends upwardly and orthogonally from a top planar wall of the barrel portion. There is a suction passage extending axially along the boss which includes first and second passages. There are a plurality of suction holes around the periphery of the suction cylindrical portion which communicate with the space between the two substrates. The holes extend radially through the suction cylindrical portion and have inner ends that open directly into the first passage. The first passage opens directly into the second passage, and the diameter of the second passage is greater than that of the first passage.

Abstract: A method of manufacturing a storage disc by curing a substrate material thereof even if ultraviolet scarcely passes through the substrate material.

Abstract: A method and apparatus for effectively developing an adhesive in a storage disc including differentiating a suction force applied from a surface of a rotary holding table from a drawing force applied from a boss. The method includes holding a storage disc on a rotary table by suction, the storage disc including two disc-shaped resin substrates each having a central hole and adhesive interposed therebetween. A boss of the rotary holding table is inserted into the central holes of the two disc-shaped resin substrates, and individual suction and drawing passages are provided for holding the storage disc on the rotary table and for drawing the adhesive by way of the boss, respectively.

Abstract: There is provided a method of curing an optical disc capable of effectively curing the optical disc without generating a warp phenomenon when optical disc is cured while ultraviolet curing resin material is irradiated with ultraviolet. The method of curing an optical disc comprises overlaying first and second resin substrates onto each other by way of an adhesive made of ultraviolet curing resin material, the method further comprising clamping the optical disc by ultraviolet transmittance plates at both sides thereof, and curing the adhesive while being irradiated with ultraviolet from outside of the ultraviolet transmittance plates.