摘要:
A recording apparatus capable of recording an optical disk obtained by adhering two substrates having predetermined curvatures with the convex surfaces of the substrates being adhered, wherein a light source irradiates light through an optical set to the optical disk via a converging lens. Plural light detectors are provided for photoelectrically converting reflection light from the data recording surface of the optical disk and returning through the optical set to output respective signals corresponding to a difference in distance between the lens and the data recording surface, a difference between the center of a light beam spot formed at a focal point position of the lens in a center of either one of a track and a pit line on the data recording surface, and a degree of tilt of the data recording surface. Lens movement mechanisms are provided to move the lens perpendicular and parallel to the data recording surface and to cancel the tilt. The signal recording on the disk is reproduced and output from the apparatus.
摘要:
An optical disc molding device has a pair of molds for injection molding a disc substrate within cavities, and a stamper supported within at least one cavity, for molding a data recording surface in such a manner that the inside diameter side of the stamper supporting surface of the cavity protrudes inwardly in the disc thickness direction from the data recording surface. The flatness of a laminated reference plane has thus been deteriorated by burrs occurring on a disc substrate.
摘要:
A disc substrate inject-molded comprises; a first circular surface having an inner non-data region formed around a center hole thereof and an outer data region formed around the non-data region; a second circular flat surface opposite and parallel to the first circular surface; and a ring shaped stack-rib formed on the non-data region.
摘要:
An optical disk having a data recording surface, which is prepared by the process, in which two metal molds having curvature surfaces on their cavity sides are used for making substrates having predetermined curvatures, for the optical disk by injection molding, and the substrates are adhered together such that convex surfaces of the substrates are adhered surfaces.
摘要:
A system and method cures a combination of a top and a bottom substrate with a resin disposed in-between. A cure device inherently warps the combination in one direction as a result of a curing operation that the cure device performs on the combination. A temperature gradient inducing device is disposed closer to one of the top and bottom substrates to create a temperature gradient between the top and bottom substrate and thereby warp the combination in a direction opposite to the one direction.
摘要:
The invention intends to provide a method of manufacturing an optical disc capable of efficiently manufacturing a high quality optical disc by a consecutive product line, and to improve productivity in an injection molding step. The method is constituted by bonding two disc halves wherein a first disc half storing information therein and molded by a mold of a first injection molding unit and second disc half storing information therein, which information is different from that stored in the first disc half, and molded by a mold of a second injection molding unit are paired with and bonded to each other.
摘要:
A composite optical disk structure includes a first transparent disk plate having a first center hole, a first stamper clamp groove and a first information recording area on its one main surface; a second transparent disk plate having a second center hole having a diameter equal to that of the first center hole, a second stamper clamp groove and a second information recording area on its one main surface; a transparent adhesive sandwiched between the first and second transparent disk plates to bond the one main surfaces of them; and a mechanism formed between the one main surfaces for preventing the transparent adhesive from leaking our into the center holes.
摘要:
An improved substrate and stamper holder and method of forming substrates are disclosed. According to a preferred embodiment of the invention, a substrate for a DVD has a moat with a capillary barrier shape. Under one embodiment, the moat has a region with an abrupt outer diameter transition. One embodiment has the outer diameter transition at approximately at a right angle relative to a registering surface of the substrate. Another embodiment of the invention provides a wider moats. The improvements reduce the likelihood of resin wicking past the moats.
摘要:
A system and method cures a combination of a top and a bottom substrate with a resin disposed in-between. A cure device inherently warps the combination in one direction as a result of a curing operation that the cure device performs on the combination. A temperature gradient inducing device is disposed closer to one of the top and bottom substrates to create a temperature gradient between the top and bottom substrate and thereby warp the combination in a direction opposite to the one direction.
摘要:
Method and apparatus for producing a bonded composite disk including a first and a second disk component which are bonded together, using a mold including a first mold half having first concentric elements whose axial end faces cooperate with an annular information-bearing stamper or an annular blank stamper, to provide a first molding surface, and a second mold half having a second concentric elements whose axial end faces provide a second molding surface cooperating with the first molding surface to define a cavity for forming each of the first and second disk components. The diameters of first annular boundaries between the end faces of the adjacent first concentric elements are different from those of second annular boundaries between the end faces of the adjacent second concentric elements, and the first disk component formed with the information-bearing stamper set on the first mold half is bonded at a first bonding surface formed by the first molding surface to a second bonding surface of the second disk component that is formed by the second molding surface with the blank stamper set on the first mold half.