Optical data media
A technology of optical information and media, applied in the field of optical information media, can solve the problems of reading, reproduction instability, address and other area information errors, etc.
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no. 1 Embodiment
[0069] Using a polycarbonate substrate with an outer diameter of 120 mmφ, an inner diameter of 15 mmφ, a thickness of 0.597 mm, and a refractive index of 1.59, a tracking guide 3 with a half-value width of 0.31 μm, a depth of 140 nm, and a pitch of 0.74 μm was prepared on one of its main surfaces. Optical substrate 1. Here, the part of the relief 8 between the tracking rails 3 is formed with a plurality of relief pre-pits 6 with a half-value width of 0.25 μm and an error of ±0.02 μm.
[0070] A solution of trimethyl dye (cyanine dye) was spin-coated on the surface side of the translucent substrate 1 having the aforementioned tracking guide 3 to form a thin film, and a recording layer 12 with a film thickness of 60 nm was formed. The leveling rate at this time is 0.3.
[0071] The difference Dp-Dr of the groove depth between the part of the track track 3 and the part of the relief pre-pit 6 of the recording layer 12 is 15 nm.
[0072] Furthermore, gold (Au) is sputtered on the reco...
no. 2 Embodiment
[0075] In the first embodiment described above, except that the length of the relief pre-pit 6 is set to a half-value width of 0.28μm, the error is within ±0.02μm, and the part of the tracking guide 3 of the recording layer 12 and the relief pre-pit An optical information medium with the same conditions as those of the first embodiment, except that the difference in groove depth Dp-Dr of the portion of the pit 6 is 20 nm.
[0076] The optical information medium produced in this way uses an optical pickup (with an aperture ratio of 0.6) that emits a laser beam with a wavelength of 650 nm, and when reading segment information, address information can be stably taken out. In addition, the same system is used to record an 8 / 16 modulated signal (converting 8 bits to 16 bits) with a recording power of 11.5 mW. When the recorded optical information medium is reproduced by a DVD player, there are few reading errors of the data signal, and stable reproduction can be performed. It was obtai...
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Abstract
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