1. Field of the Invention
The present invention relates to an optical disk apparatus carrying out recording/reproduction of information with respect to an optical disk, and a method for controlling the same, and in particular, to an optical disk apparatus that automatically discriminates a standard of the optical disk.
2. Description of the Related Art
As well known, in recent years, a technique of recording information at a high density has been developed, and an optical disk having a recording capacity of 4.7 GB (Giga Bytes) on one side has been put to practical use.
As this type of optical disk, there are various standards, for example, DVD-ROMs (Digital Versatile Disk—Read Only Memory) which are a reproduction-only type, DVD-RAMs (Random Access Memory), DVD-RWs (Rewritable), DVD+RWs which are a rewritable type, and DVD-Rs which a write-once type.
In an optical disk apparatus in which recording/reproducing can be carried out so as to selectively mount optical disks of several types of standards, there is provided a function in which the standard of a mounted optical disk is automatically discriminated by utilizing the fact that the light reflectance factors of the optical disks are different in accordance with the standard thereof, and adjustments or settings of respective portions are changed based on the discriminated result.
Incidentally, the current rewritable type optical disks having the same standard are further subdivided into a plurality of types in accordance with a characteristic of a recording film to be used.
Therefore, it is important for an optical disk apparatus to have a function of not only discriminating the basic standards of DVD-RAM, DVD-RW, DVD+RW, or the like, but also of automatically discriminating a characteristic of a recording film to be used, and of changing the adjustments and settings of the respective portions.
In Jpn. Pat. Appln. KOKAI Publication No. 2001-266367, there is disclosed a configuration in which focus-searching is applied to a mounted optical disk, and due to a light reflectance factor of the optical disk being measured based on a focus error signal obtained as a result thereof, a discrimination between a CD (Compact Disk)-ROM, a CD-R, and a CD-RW is carried out, and respective circuits for reproducing/recording are switched in accordance with a discrimination result.
However, in the Jpn. Pat. Appln. KOKAI Publication No. 2001-266367, there is no description about that a type based on a characteristic of a recording film which is used is further automatically discriminated with respect to rewritable type optical disks having a same standard.