Information recording carrier and method of reproducing the same
View Patent ↗Plural grooves or lands formed in an information recording carrier include at least a wobbling region and data is recorded wobblingly in this wobbling region by frequency shift modulation while recorded digitally with a single or multiple waves as a channel bit.
1. An information recording carrier having minute pattern including plural grooves or lands formed to be substantially in parallel and adjacent each other, comprising:
a supporting body having the minute pattern thereon;
a recording layer formed on the minute pattern; and
a light transmission layer formed on the recording layer,
wherein when a pitch of each groove or land is P, a wavelength of a laser beam is λ and a numerical aperture of an objective lens is NA, the minute pattern is formed under a relation of P <λ/NA;
wherein the plural grooves or lands have at least a wobbling region and data is recorded wobblingly in the wobbling region by frequency shift modulation;
wherein the wobbling region includes a single modulation region in which data is recorded as a wave having a single frequency; and
wherein the single frequency is equal to one of frequencies of a high frequency portion and a low frequency portion composing the frequency shift modulation.
2. A method of reproducing the information recording carrier as recited in claim 1 , comprising:
irradiating the laser light on the recording layer through the light transmission layer in such a way that the laser light tracks the grooves or lands therebeneath;
detecting the laser light reflected by the recording layer; and
recognizing the frequencies that are used in frequency shift modulation through the detected laser light.
3. The information recording carrier as recited in claim 1 ,
wherein a phase of the high frequency portion and a phase of the low frequency portion are continuous at a border between the high frequency portion and the low frequency portion comprising the frequency shift modulation.
4. A method of reproducing the information recording carrier as recited in claim 3 , comprising:
irradiating the laser light on the recording layer through the light transmission layer in such a way that the laser light tracks the grooves or lands therebeneath;
detecting the laser light reflected by the recording layer; and
recognizing the frequencies that are used in frequency shift modulation through the detected laser light.