Optical information recording medium, medium characteristic definition method, medium characteristic inspection method, signal detection method, signal detection circuit, and optical information recor
An optical recording medium and a technology for recording media, applied in optical recording/reproducing/erasing methods, optical recording carriers, recording/reproducing by optical methods, etc., can solve problems such as inability to manage stable characteristics or standard values, and High reproducibility and effect of suppressing measurement deviation
Inactive Publication Date: 2007-12-26
CMC MAGNETICS CORPORATION
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[0015] In this way, various signal specifications differ depending on the recording state (unrecorded or recorded) of the adjacent recording layer, so it is impossible to achieve stable characteristics in the conventional regulation method considering only one recording layer (single layer). Determination of management or standard values
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[0091] The best mode for carrying out the present invention will be described with reference to the drawings.
[0092] FIG. 1 is a diagram showing a configuration example of a general optical information recording medium (media) 1 that is also applied in this embodiment. Here, FIG. 1( a ) is a schematic plan view of the medium 1 , and FIG. 1( b ) is a schematic perspective view showing a part of the medium 1 .
[0093]A track 4 composed of grooves (grooves) and lands 3 is formed concentrically or spirally in the medium 1 . This track 4 is preformed by a medium forming device. The information recording and reproducing device records and reproduces information along the track 4 . In addition, in the medium 1, as rotation information, when rotating at a constant linear velocity or a constant angular velocity, the rail 4 is curved so that a signal of a constant frequency (period) can be detected (see FIG. 1(b)). In CD-RW or DVD+R / RW, address information is recorded by setting t...
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There is provided an optical information recording medium having a plurality of recording layers where recording can be performed. Signal characteristics in a certain area X of the recording layer A (second layer) among the recording layers are defined by the condition that an area Y of the recording layer B (first layer) adjacent to the recording layer A (second layer) in the incident side on the optical axis of the optical beam irradiated to the area X is an already-recorded area. Thus, it is possible to suppress measurement irregularities and errors of the various signal characteristics due to the leak light from the adjacent recording layer and manage and define medium parameters with a high reliability, compatibility, and a characteristic value having a high reproducibility.
Description
technical field [0001] The present invention relates to a recordable optical information recording medium with a multilayer structure greater than or equal to two layers, such as a double-layer version of CD-R / RW, a double-layer version of DVD±R / RW, and further multilayer recording media in the future, Its medium characteristic specification method, medium characteristic inspection method, signal detection method, signal detection circuit, and optical information recording and reproducing apparatus. Background technique [0002] In recent years, it can be said that CD-R / RW or DVD±R / RW has been fixed as an external storage device of a PC. In addition, CD-R / RW or DVD±R / RW is expected to increase in capacity in the future, and double-layer and further multi-layer in the future are also being studied. [0003] In such a multi-layer medium, the distance between layers is generally set so that light reflected from recording layers other than the one being accessed does not leak i...
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IPC IPC(8): G11B7/004G11B7/24G11B7/242
Inventor 前川博史
Owner CMC MAGNETICS CORPORATION