Photorecording medium and photorecording method
An optical recording medium, optical recording technology, applied in the direction of optical recording carrier, optical recording/reproduction/erasing method, optical recording head, etc., can solve deformation, distortion, interference between codes, and inability to read color density state when irradiated with laser light, etc. question
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example 1
[0108] A pigment solution for forming a recording layer with a concentration of 2 wt % was prepared by dissolving a cyanine pigment in fluorinated ethanol as a coating medium, and a helical pregroove (a track pitch of 1.1 μm, The pregroove side surface of a light-transmitting substrate with a diameter of 120 mm and a thickness of 1.2 mm made of polycarbonate (Panlight AD5503 manufactured by Teijin Chemicals Co., Ltd.) with a pregroove width of 0.35 μm and a pregroove depth of 0.18 μm On the surface, the solution was applied by spin coating while changing the number of rotations between 200 rpm and 5000 rpm to form an organic dye recording layer with a thickness of about 200 nm from the bottom in the pregroove.
[0109] Next, a light reflection layer was formed on the organic pigment recording layer by sputtering Ag with a thickness of about 100 nm. Further, an ultraviolet curable resin (Dainippon Inki Chemical Industry Co., Ltd.: SD318) was coated on the light reflection layer...
example 2
[0118] The cyanine in Example 1 was changed to phthalocyanine, and the coating solvent was changed to methylcyclohexane to prepare a pigment solution. In addition, an optical recording medium was produced in the same manner as in Example 1.
[0119] The laser beam power at the time of recording was set at 13 mW. At this time, the recording linear velocity is 3.6m / s, the recording clock frequency is 4MHz (250nsec), and the laser irradiation time during recording is (1) 50nsec, (2) 70nsec, (3) 90nsec, (4) 110nsec, (5) 130nsec, (6) 150nsec. The respective single signals are recorded for one round of the disc.
[0120] The initial reflectance of this medium was 68% (0.68), and the lowest reflectance was 22% (0.22) when the laser was irradiated for 250nsec or more. Therefore, the variation range of the reflectance is 0.46 (=0.6-0.22).
[0121] The irradiation time required for the reflectance of the medium to decrease from the above-mentioned initial reflectance of 0.68 to 20% ...
example 3
[0124] The dye solution in Example 1 was changed to a mixture of cyanine and azo metal complex, and an optical recording medium was produced in the same manner. The mixing ratio of cyanine and azo metal complex is 50:50wt%.
[0125] The laser beam power at the time of recording was set at 14 mW. At this time, the recording linear velocity is 3.6m / s, the recording clock frequency is 4MHz (250nsec), and the laser irradiation time during recording is (1) 20nsec, (2) 56nsec, (3) 92nsec, (4) 128nsec, (5) 164nsec, (6) 200nsec. Record each single signal for one revolution.
[0126] The initial reflectance of this medium was 70% (0.70), and the lowest reflectance was 21% (0.21) when the laser was irradiated for 250nsec or more. Therefore, the variation range of the reflectance is 0.49 (=0.70-0.21).
[0127] The irradiation time required for the reflectance of the medium to decrease from the above-mentioned initial reflectance of 0.70 to 20% (about 0.10) of the range of reflectance...
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