摘要:
In the provided optical disc, a lead-in area (100), a user data area (120) and a lead-out area (130) each have grooves (123) and lands (125) formed thereon. Since the same manufacturing condition can be adopted for the whole disc, the yield can be enhanced and the manufacturing cost can be reduced. Also, the lead-in area, the user data area and the lead-out area use wobbles (108) to record data, to obtain a reliable reproduced signal.
摘要:
In the provided optical disc, a lead-in area (100), a user data area (120) and a lead-out area (130) each have grooves (123) and lands (125) formed thereon. Since the same manufacturing condition can be adopted for the whole disc, the yield can be enhanced and the manufacturing cost can be reduced. Also, the lead-in area, the user data area and the lead-out area use wobbles (108) to record data, to obtain a reliable reproduced signal.
摘要:
An optical storage medium comprising: a lead-in area, which comprises a read only area and a readable/recordable area; a user data area in which user data is recorded; a first wobble formed in the read only area of the lead-in area; and a second wobble formed in the readable/recordable area of the lead-in area; wherein the first wobble is modulated by a first modulation method and the second wobble is modulated by a second modulation method other than the first modulation method, and further an apparatus for transferring data with respect to an optical storage medium comprising a lead-in area, which comprises a read only area and a readable/recordable area, and a user data area in which user data is recorded, the apparatus comprising: an optical pickup to emit light to transfer data on the storage medium; and a controller arranged to control the optical pickup to record data on the storage medium, wherein first data with respect to a first wobble formed in the read only area of the lead-in area is transferred, second data with respect to the readable/recordable area, in which a second wobble is formed, of the lead-in area is transferred, the first wobble is modulated by a first modulation method and the second wobble is modulated by a second modulation method different to the first modulation method.
摘要:
A method and apparatus for recording data on an optical recording medium are provided. The method forms a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. By doing so, the method prevents distortion of and improves a mark shape such that the characteristic of recording/reproducing is improved.
摘要:
An optical recording medium has a user data area (120) and a lead-out area (130), wherein the user data area and the lead-out area each has grooves (123) and lands (125) formed thereon. Wobbles (105,135) are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area (120). Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.
摘要:
An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.
摘要:
A high density disc having a data area (130) which is set to maintain compatibility with existing drives while providing a superior recording/reproducing feature. The high density disc has a center hole (100), a clamping area (110), a data area (130) where user data is recorded, a lead-in area (120) located at the inner side of the data area, and a lead-out area (140) located at the outer side of the data area. In the high density disc the diameter of the center hole (100) is 10 mm or more, and the inner diameter of the clamping area (110) is characteristically within a range of 20-26 mm. Also, the inner diameter of the data area (130) is characteristically within a range of 35-40 mm. Therefore, while a conventional disc drive is still used, the size of the high density disc decreases and a recording capacity can be increased.
摘要:
A phase change optical disc is provided. The phase change optical disc has a multilayer structure in which on a transparent substrate (21) are sequentially laminated a first dielectric layer (22), a phase control layer (23), on which the two areas where a phase difference occurs due to irradiation with the reproduction beam, thus altering the optical path of the reproduction beam, are defined in a laser spot, a second dielectric layer (24), a phase change recording layer (25), which reversibly converts between a crystal phase and an amorphous phase by irradiation with a recording beam, a third dielectric layer (26), a reflective layer (27), and a protective layer (29). The information of a record mark can be reproduced due to the phase difference between adjacent areas on the phase control layer, thereby reducing the size of the effective spot of the reproduction beam. Accordingly, the mixing of the signals between adjacent marks or adjacent tracks is decreased, thereby realizing a high density optical disc and improving the resolution power of a reproduction signal.
摘要:
An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.