| 摘要 |
PROBLEM TO BE SOLVED: To provide an information recording and reproducing device which has a simple and inexpensive circuit constitution, properly controls the speed of revolution of a spindle motor, and effectively prevent the deterioration of characteristics of the recording and reproducing. SOLUTION: The information recording and reproducing device has first detection means 12 and 35 which detect tracking error signals including an offset signal component corresponding to the shift from a prescribed position in the tracking direction of an objective 5 on the basis of the return light from a disk type recording medium 1, and second detection means 15 and 37 which detect only the offset signal on the basis of the return light from the disk type recording medium 1, a tracking error signal, in which the offset signal is removed by a differential arithmetic operation of the outputs from the first and the second detection means, is detected and the driving of the tracking actuator 32 is controlled on the basis of the tracking error signal, and the speed of revolution of the spindle motor 2 is controlled on the basis of the offset signal from the second detection means.
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