Optical recording media
A technology of optical recording medium and recording layer, applied in optical recording medium, data recording, temperature recording method, etc., can solve the problems of recording sensitivity and signal modulation degree, insufficient light absorption or reflectivity, etc.
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Embodiment 1-1
[0359] Optical discs were prepared using pigment a4, pigment a5 and pigment a6 individually as recording materials in the following manner.
[0360] First, each of the pigments a4, a5, and a6 was dissolved in tetrafluoropropanol to obtain a pigment solution. Note that the concentration of the pigment solution was adjusted so that the reflectance of the formed reflective layer at a wavelength of 640 nm was 50%.
[0361] On the other hand, a polycarbonate disc substrate having a thickness of 0.6 mm and an outer diameter of 120 mm was prepared. Note that guide grooves at a pitch of 0.8 µm are formed on one side of the disk for tracking the laser beam at the time of recording.
[0362] On this substrate, a pigment solution was applied by spin coating to form a recording layer. It should be noted that a computer is used to control the application amount of the pigment solution and to control the application sequence.
[0363] First, place the puck with its guide groove side up a...
Embodiment 1-2
[0388] Among the pigment compounds a, a mixture of pigments a1 and a2, and a mixture of pigments a3 and a5 were respectively used as recording materials to prepare optical discs as follows.
[0389] The pigment a1 and the pigment a2 were mixed at a weight ratio of 1:3, and then dissolved in tetrafluoropropanol to obtain a pigment solution. The pigment a3 and the pigment a5 were mixed at a weight ratio of 5:1, and then dissolved in tetrafluoropropanol to obtain a pigment solution. The concentration of the pigment solution was adjusted so that the reflectance of the formed reflective layer at a wavelength of 640 nm was 50%.
[0390] In the same manner as in Example 1, optical discs were prepared using these pigment solutions.
[0391] The reflectance spectrum of the resulting disc is shown in Figure 7 with Figure 8 . It should be noted that Figure 7 Given is the reflectance spectrum of a disc prepared using a mixture of pigments a1 and a2; Figure 8 Shown is the reflect...
Embodiment 2-1
[0403] An optical disc was prepared as follows using Pigment b1 and Pigment 26 alone as recording materials.
[0404] Dissolve pigments b1 and b2 in tetrafluoropropanol to obtain pigment solutions. Note that the concentration of the pigment solution was adjusted so that the reflectance of the formed reflective layer at a wavelength of 640 nm was 50%.
[0405] In the same manner as in Example 1, optical discs were prepared using these pigment solutions.
[0406] The optical reflectance spectrum of the obtained disc is shown in Figure 10 with Figure 11 . It should be noted that Figure 10 Given is the reflectance spectrum of the disc prepared using pigment b1; Figure 11 Shown is the light reflectance spectrum of a disc prepared using pigment b2. In these optical discs, a reflectance of about 50% was obtained at a wavelength of 640 nm.
[0407] Then, with respect to these optical discs, under the same conditions as in Example 1, a recording test was performed using a 64...
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Abstract
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