Victor Co. of Japan, Ltd. (JVC) is the first in the world which realizes three-layer structure of BD (blue ray disk) single layer and two layers of DVDs, and can record both HD image and SD (standard) image on the disk of one sheet with an original highly efficient reflective film. * の BD-DVD combination ROM disk technology (sum total capacity of 33.5GB) was developed. (As of *: December 24, 2004)
It is the disk of the three layer structure of one side reading where this disk prepared BD single layer (it is the signal layer which stored HD image, and is the capacity of 25GB) in the surface portion, and prepared two layers (it is the capacity of 8.5GB in the signal layer which stored SD image) of DVDs in the inside. nud Fig. 1 . About the time of BD reproduction, BD layer of a surface portion is reproduced by the blue laser of BD apparatus, and an internal DVD layer is reproduced by the red laser of DVD apparatus at the time of DVD reproduction. nud Fig. 2 . While our company made full use of the disk process technology cultivated for years until now, the original highly efficient reflective film with the character "the red laser for DVD penetrates although the blue laser for BD is reflected" was developed, and three layer structure of one side reading was realized.
In addition, since the two-layer structure (capacity of 8.5GB) which is in use is adopted as the DVD layer of this disk, on the occasion of utilization, as [ of data そ of DVD software on sale ] is utilizable.
When the software which recorded the image of both BD and DVD on the disk of one sheet is put in practical use by development of this disk, ""With the small television and PC (the going-out place mobile PC) of a single room, SD image of DVD is enjoyed for HD image of BD high definition in living with" a big-screen TV. SD image is enjoyed by DVD apparatus at the beginning of soft purchase. After BD apparatus purchase becomes possible [ how to enjoy oneself of enjoying HD image of BD" ]. When the mass feature is harnessed, in addition to an image, contents, such as advertisement, music, and a game, can also be recorded, and the possibility of the disk of one sheet spreads greatly.
Moreover, since it is collected into one sheet, it is considered that BD and DVD can contribute also to saving resources and energy saving.
Our company will make the standard proposal of this disk technology to a blue lei disk association (BDA) towards utilization from now on. Furthermore, one more step of large scale-ization is also tackled and development of sum total capacity the disk of 58.5GB (BD2 layer 50 GB+DVD2 layer 8.5GB) is also aimed at.
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<The main features of a BD-DVD combination ROM disk>
1 The signal of both BD and DVD is recorded on the first in the world and the disk of one sheet.
- One side reading and a combination disk with [ BD layer / portion / surface ] / to the inside / the DVD layer by sticking BD layer (signal layer which stored HD image), and a DVD layer (a signal layer, two layers which stored SD image) with advanced positioning adhesion technology were realized for the first time in the world.
- Blue laser light is reflected, and red laser light develops the original highly efficient reflective film to penetrate, and applies it to BD layer. This became possible to reproduce a DVD layer by red laser through BD layer.
- The two-layer structure (a maximum of 8.5GB) which is in use is adopted as a DVD layer. Together with the storage capacity of a maximum of 25GB of BD layer, no less than a total of 33.5GB of large scale was realized.
2 The three-layer structure disk by double-sided fabrication
The manufacturing technique based on mass-production experience of a DVD disk is united with the detailed processing nanotechnology cultivated by BD disk development. By carrying out double-sided fabrication of one side of BD layer and a DVD layer, the prospect was attached to productivity almost equivalent to BD disk only for reproduction.