G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1, 352/33
G11B 20/12 (2006.01) G11B 7/004 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 11/105 (2006.01) G11B 19/28 (2006.01) G11B 20/10 (2006.01) G11B 27/034 (2006.01) G11B 27/32 (2006.01)
Patent
CA 2017501
A recording/reproducing device that performs the recording/reproduction on a writable disk comprising an information recording area and a TOC area, and provided with guiding grooves that snake with cycles corresponding to the values of absolute addresses, comprises division setting means for dividing according to an external setting and to a set capacity ratio, the information recording area into a plurality of domains respectively corresponding to each sampling frequency of information to be recorded, and for producing additional information that indicates the details of the division, an electromagnet and an optical head for recording each information in the domain of the information recording area that corresponds to its sampling frequency and for recording the additional information including the details of the division in the TOC area, a spindle motor that drives the disk, speed changing means for adjusting the speed of the spindle motor such that the velocity of the disk is changed in each domain during recording and reproduction, a demodulator where the absolute addresses are obtained through demodulation by comparing frequencies determined from the snaking cycles of the guiding grooves with a reference frequency, changeover switches that change the reference voltage of the demodulator in accordance with the sampling frequency of each information, and an operational circuit that converts the demodulated absolute addresses in accordance with the velocity of the disk and determines corrected absolute addresses that correspond to the time elapsed when taking the recording/reproduction starting time as reference. As a result, the burden imposed on the spindle motor is relieved, the demodulation of the absolute addresses may be executed accurately even when the rotational speed of the disk varies, and the time elapsed since the start of the recording/reproduction may be determined.
Deguchi Toshihisa
Kojima Kunio
Maeda Shigemi
Terashima Shigeo
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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