The assignee for this patent, patent number 8524347, is
Reporters obtained the following quote from the background information supplied by the inventors: "With the rapid development of the recent digital information society, an increase in the capacity has been required in an optical disk, which is one of representative storage devices, and intense development has been advancing in many fields. A .phi.120 mm optical disk which is now commercially available has a pit length of 0.1 .mu.m to 0.2 .mu.m and a capacity from about 15 GB to 30 GB. A technology has now been considered to increase the capacity by reducing the shortest pit length in the next generation and the next generation. In order to achieve this, an original disk has been manufactured by the Deep UV laser beams or electron beams. Reported is a technique of forming an extremely short pit such as the shortest pit length of 80 nm manufactured by the Deep UV laser beams and the shortest pit length of about 40 nm manufactured by the electron beams. When the shortest pit length is about 40 nm, the capacity is estimated to be about 500 GB/12 cm.
"An optical disk substrate used for such high-density recording/reproducing is manufactured by an injection molding method using a stamper on which a replicated pattern is transferred from the original disk of the optical disk described above (see patent literatures 1 to 3).
"Another method for achieving an increase in the capacity is forming an information recording layer on an asperity pattern on the optical disk substrate described above. Then, the second asperity pattern is arranged using the ultraviolet curable resin. After forming a film on this asperity pattern, a third asperity pattern is further provided using an ultraviolet curable resin, so as to form a film. By repeating these processes, the optical information recording medium that includes a plurality of information recording layers can be obtained.
"Further method for achieving an increase in the capacity is to store in one cartridge a plurality of multi-layer optical disk media each including a plurality of information recording layers as described above. In this way, the increase in the capacity of the optical disk system is intended to be achieved."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "Technical Problem
"However, there are problems as follows in the related arts described above.
"In the related arts, one cartridge contains a plurality of multi-layer optical disk media each including a plurality of information recording layers. However, in order to increase the storage capacity for each optical disk system, the number of information recording layers provided in one optical disk medium needs to be increased as much as possible. For this purpose, a multi-layered information recording layer has been typically employed. In this case, according to the related arts, the total film thickness of the spacer layer and the asperity pattern forming each information recording layer is typically within a range of approximately from 20 .mu.m to 60 .mu.m. Note that the asperity pattern is formed of an ultraviolet curable resin and the spacer layer is formed of an ultraviolet curable resin or a transparent sheet.
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