Rewritable optical information recording medium and recording/reproducing method, recording/reproducing device
A technology for recording media and optical information, applied in optical recording/reproducing/erasing methods, optical recording carriers, optical recording systems, etc., capable of solving problems such as uneven crystallinity, insufficient repeatability, and increased signal noise
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Embodiment approach 1
[0425] This embodiment is an example of a DVD using blue laser light with a wavelength λ=405 nm.
[0426] A polycarbonate substrate having a thickness of 0.6 mm and an outer diameter of 120 nm having grooves in the shape of a pitch of 0.6 μm, a groove depth of 50 nm and a groove width of 0.28 μm has been produced by an injection molding method from a punch press. The film structure of this embodiment is the same as that shown in FIG. 1 . The porphyrazine dye represented by the general formula (A) shown in the recording layer 2 has been evaporated by vacuum deposited onto the grooves on the substrate so that the film thickness becomes 60 nm. The refractive index and absorption coefficient of the recording layer 2 at 450 nm were n=1.8 and k=0.05, respectively. Then, an optical recording medium with the same shape as DVD was prepared by depositing a 100 nm thick silver reflective layer 3 onto the recording layer by means of sputtering, followed by UV curing by spin coating [SD...
Embodiment approach 2
[0432] This embodiment is also an example of a DVD using blue laser light of wavelength λ=405nm.
[0433] The same substrate, organic dye recording film, silver reflective film and protective film were used. The film structure of this example is shown in FIG. 2 . The difference between this embodiment and Embodiment 1 is that SiO with a film thickness of 30 nm is deposited between the substrate 1 and the recording film 3 and between the recording film 3 and the reflective film 5 by sputtering. 2 They are respectively used as the transparent protective layer 5 and the transparent protective layer 6. The initial reflectance of the disk is 12%, which is actually equivalent to the calculated value.
[0434] A simple repetitive signal corresponding to a pit length of 0.5 µm was recorded under the same conditions as in Embodiment 1.
[0435] When the recorded portion was reproduced at a reproduction power of 0.5 mW, it was confirmed that the C / N ratio = 59 dB. Fig. 9 shows the R...
Embodiment approach 3
[0438] This embodiment is an example of a DVR (an optical disk in which recording and reproduction are performed through a light-transmitting layer with a thickness of 10 to 177 μm) using blue laser light with a wavelength of λ=405 nm.
[0439] An example is given of the film structure in FIG. 3 relating to a recording medium capable of recording and reproducing favorably in an optical system having a wavelength of 405 nm and a wavelength of NA=0.85. Note here that by forming guide grooves with a track pitch of 0.64 [mu]m in the polycarbonate substrate 1 and setting the width of the guide grooves to 50%, recording can be performed on both the edge and the groove. In addition, the depth of each groove was 40 nm. Deposit a silver alloy reflective film with a thickness of 12nm on it by sputtering, and porphyrazine dye was used to form organic dye thin films by vacuum evaporation method 3.
[0440] [chemical formula 31]
[0441]
[0442] The thickness of the organic dye thin ...
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Abstract
Description
Claims
Application Information
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