Optic recording method and optic recording medium
An optical recording medium and optical recording technology, applied in the direction of optical recording carrier, optical recording/reproduction/erasing method, optical recording system, etc., can solve the problem of easy crystallization of amorphous recording marks, reduce cross erasure, and cannot be significantly Improving the crystallization speed of the recording layer, etc.
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Embodiment 1
[0119] Follow the steps below to make a image 3 The structure shown is a sample of an optical recording disc recorded by a groove recording method or a land / groove recording method.
[0120] The supporting base 20 is a disk-shaped polycarbonate with a diameter of 120 mm and a thickness of 1.2 mm. On the surface of the supporting base, there is provided a concavo-convex pattern that becomes grooves and lands after being transferred onto the translucent base 2 .
[0121] Under the Ar ambient atmosphere, the reflective layer 5 was formed by sputtering, and the target was Ag 98 PD 1 Cu 1 . The thickness of the reflective layer was 100 nm, and the thermal conductivity of the reflective layer was 170 W / mK.
[0122] The second dielectric layer 32 is made of Al 2 o 3 The target was formed by a sputtering method in an Ar ambient atmosphere. The thickness of the second dielectric layer was 20 nm. Al for target 2 o 3 The thermal conductivity is 10.5W / mK.
[0123] The recordi...
Embodiment 2
[0149] In addition to using the support base 20 with high dimensional accuracy of the groove width, the track pitch P T Except for the values shown in Table 2, an optical recording disc sample was produced in the same manner as in Example 1. P shown in Table 2 T It is not the virtual track pitch in Embodiment 1, but the actual track pitch.
[0150] These samples were evaluated in the same manner as in Example 1, and the results are shown in Table 2. Then, after recording on each sample by the groove recording method, a transmission electron micrograph of the recording layer was taken, and the recording mark width M was measured from the obtained photograph. W , find the groove width G W The ratio sum and track pitch P T ratio. As a result, M W / G W In the range of 2.0 to 2.8, while M W / P T In the range of 0.70 to 0.86. Table 2
[0151] λ=405nm, NA=0.85
[0152] P T Cross Erase (dB)
[0153] Groove record Land / groove record
[...
Embodiment 3
[0162] Follow the steps below to make a Figure 4 The structure shown is a pre-recorded disc sample recorded by the groove recording method or the land / groove recording method.
[0163] The translucent substrate 2 is a disk-shaped polycarbonate having a diameter of 120 mm and a thickness of 0.6 mm, in which grooves are simultaneously formed by injection molding. In the groove recording method and the land-groove recording method, the track pitch P T are the values shown in Table 3, respectively. Groove width G in groove recording medium W set to G W / P T It is 0.30 to 0.35, and the groove width and the land width are the same in the land-groove recording method medium.
[0164] With ZnS(80mol%)-SiO 2 (20 mol%) target, the first dielectric layer 31 was formed by sputtering in an Ar atmosphere. The thickness of the first dielectric layer is 80 nm.
[0165] Using an alloy target, the recording layer 4 was formed by sputtering in an Ar ambient atmosphere. The compositio...
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Abstract
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