| 摘要 |
An information recording/reproducing apparatus (100) includes an optical device (2), a photo-detector (20) and a calculation unit (30). The optical device irradiates light beams, including one main beam and at least two sub-beams with respect to an information recording medium (1). The photo-detector receives return lights of the main beam and sub-beams to output light detection signals (F, E). The calculation unit produces a tracking error signal (DPP) and a position information signal (RC) based on the light detection signals. The optical device irradiates the at least two sub-beams onto positions shifted to opposite sides of a center of the guide track, respectively, when the main beam is being irradiated onto a center of the information recording track. Thus, the apparatus produces the tracking error signal and the position information signal by utilizing a common optical system and a common signal processing system and thereby executes tracking servo control and random access processing with high accuracy. <IMAGE>
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