Optical recording medium, method and apparatus for recording/reproducing the same
An optical recording medium and medium technology, applied in optical recording/reproduction/erasing methods, optical recording/reproduction, optical recording carriers, etc., can solve problems such as insufficient accuracy, reduce manufacturing costs, and simplify recording /Reproduce the effect of device, accurate address information
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no. 1 example
[0063] The optical disk of this embodiment is a write-once type disk with a diameter of 12 cm, which has an organic dye recording film on which recording can be performed with a laser beam having a wavelength of 636 nm.
[0064] The disc is made of polycarbonate and the channels and the steps between adjacent rings of the channels are made by injection molding.
[0065] The thickness of the groove is about .25μm, the depth is about 70nm, a continuous spiral groove is formed from the inner ring to the outer ring, and the concave interval or track pitch is about 0.74 μm.
[0066] A wobble signal of a single frequency is recorded as information for controlling the revolutions per minute of the optical disk and the clock frequency of the recording signal. Wobble means that the slots are slightly curved radially of the disc.
[0067] In this embodiment, the bending width is 20 nm, and the bending period is about 30 μm. Therefore, if the disc is rotated at a linear velocity of 3.5...
no. 2 example
[0089] In this embodiment, various combinations of wobbled pits are described.
[0090] In the first example, a single-frequency wobble and pits having an integer relationship to the frequency of the wobble signal are described.
[0091] Figure 8 Signals obtained in this case are shown, from which it can be seen that the pit signal Sp is detected at a time interval equal to an integer number of periods Tw of the wobble signal Sw, i.e. at intervals equal to an integer number of pit periods Tp A pit signal Sp is detected at a time interval of .
[0092] In the second example, pits are formed in phase with the modulated wobble signal. In this example, the pits are formed at positions close to adjacent grooves, corresponding to the maximum wobble. Such as Figure 9 As shown, the pit signal Sp is located at the top of the wobble signal Sw, and pits can be detected only from the signal level of the pit signal Sp.
[0093] exist Figure 9 In , the pit signal Sp is generated du...
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Abstract
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