Optical disc and optical disc device
An optical disc device and optical disc technology, applied in the directions of optical record carriers, analog recording, magnetic recording, etc., can solve the problems of time required for access, unclear whether there are other information layers, etc., and achieve the effect of shortening the access time.
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Embodiment approach 1
[0033] 1 to 3 are schematic diagrams showing the state of an optical disc in Embodiment 1 of the present invention and an optical disc device that has accessed the information layer of the optical disc, and FIG. 4 shows the information layer of the optical disc in FIG. 1 A schematic diagram of the management area of L1. FIG. 5 is a schematic diagram showing a data structure of an optical disc including information fields of a management area. Fig. 6 is a conceptual diagram of information fields in the management area. 7 is a schematic diagram of information written in a track shape and a convergence point of the information layer L2, and FIG. 8 is a schematic diagram of information written in a track shape of the information layer L3 and a convergence point. FIG. 9 is a flowchart showing the procedure for reading type information of each information layer. Fig. 10 is a flowchart showing the procedure for reproducing another information layer using the type information of e...
Embodiment approach 2
[0058] Embodiment 2 of the present invention is the same as Embodiment 1 of the present invention in FIG. 1 to FIG. 5 and FIG. 7 to FIG. 10 , and the difference is the use of areas within the management area in FIG. 6 of Embodiment 1.
[0059] In Fig. 11, the optical disc is composed of a management area 14a located on the inner peripheral side and a user data area 15a located on the outer peripheral side. The category area 22 is recorded with information indicating the category of another information layer. In FIG. 12, information indicating the presence or absence of the information layers L2 and L3 shown in FIG. 1 is recorded in areas T2 and T3 of the display area 21, respectively. Region T4 indicates the presence or absence of an information layer based on an optical disc standard other than BD using a blue-violet semiconductor laser with a wavelength of about 405 nm as a light source, or another standard to be developed in the future, not shown in the optical disc 1 . Ea...
Embodiment approach 3
[0071] Embodiment 3 is a mode in which there are at most two types of information layers on the optical disc 1 including the type of the L1 layer. The same as Embodiment 2 of the present invention are FIG. 1 to FIG. 5 and FIG. 7 to FIG. 11 , the difference is the use of display area 21 and category area 22 in FIG. 12 of Embodiment 2.
[0072] In FIG. 13 , areas T2 , T3 , and T4 of the display area 21 are the same as those in FIG. 12 .
[0073] If there is another information layer other than the information layer L1, the area V1 of the category area 22 indicates the type of the other information layer. The category field 22 has only 2-bit information of the field V1. The above two bits are represented by 00 when the information layer is a reproduction-only type, by 01 when it is a write-once type, and by 10 when it is an overwrite type. The post-write type includes DVD-R and +R and their dual-layer standards, etc. Moreover, some types include double-layer standards of DVD-R...
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Abstract
Description
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