Optical recording medium and method of manufacturing thereof, and recording and reproducing method
A technology of optical recording medium and manufacturing method, applied in the direction of optical recording carrier manufacturing, optical recording/reproducing/erasing method, optical recording carrier, etc., capable of solving problems such as recording omission, reproduction signal deterioration, optical power reduction, etc.
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Embodiment 1
[0156] -Production of optical recording media-
[0157] A beam-transmitting substrate made of polycarbonate resin having a thickness setting center value of 600 μm was produced by injection compression molding. When molding the substrate, adjust the injection compression molding conditions appropriately (for example, use an injection compression molding machine that can perform pressurization and compression that is greater than or equal to 40t and less than or equal to 80t, for example, under the condition of 130-200°C, within 2 seconds During the processing time, the process of mold opening, material injection, press compression, and peeling of the substrate was set), and substrates with various thicknesses shown in Table 1 were produced. The substrate thickness shown in Table 1 represents the value deviated the most from the set center value of the substrate thickness of 600 μm among the measured values. Here, the substrate thickness is measured by ETA RT manufactured by E...
Embodiment 2
[0171] In Example 1, except using a master whose thickness difference between the inner peripheral part and the outer peripheral part is less than or equal to ± 5 μm, and performing injection compression molding of a polycarbonate resin substrate, the same method as in Example 1 was produced. Recording medium A".
[0172] In Example 1, an "optical recording medium B" was produced in the same manner as in Example 1, except that the outer peripheral part was 20 μm thicker than the inner peripheral part, and a polycarbonate resin substrate was produced by injection compression molding. .
[0173] The obtained substrate thicknesses of "optical recording medium A" and "optical recording medium B" are as follows Figure 9 that distribution. The substrate thicknesses of optical recording media A and B are both located at Figure 6 In the oblique line shown, judge it together with the monitoring results of the axial acceleration, and set the deviation Figure 6 The optical recordi...
Embodiment 3
[0176] Same as embodiment 1, make 100 optical recording media of varying substrate thickness and maximum axial acceleration, such as Figure 6 As shown, the relationship between the amount of deviation from the substrate thickness setting center value and the maximum allowable axial acceleration value was obtained, and the error rate was evaluated in the same manner as in Example 1. Express the values as mean values.
[0177] As a result, access to Figure 6 In the optical recording media in the shaded area, contrary to the fact that the error rate during high-speed recording was not found to be higher than the DVD standard value, the deviation Figure 6 65% of the optical recording media in the shaded portion have a poor proportional error rate.
[0178] Therefore, confirm whether you can place the Figure 6 The shaded area is used as a criterion for judging whether the optical recording medium is acceptable or not.
[0179] According to the present invention, when manufa...
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Abstract
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