generar la señal de control de seguimiento aplicando dichodesplazamiento de seguimiento a la salida de un fotodetector paradetectar la luz de dicho primer punto de luz.
Fig. 1 is a constitutional drawing to show a conventional example of an optical information recording/reproducing apparatus; Fig. 2 is an explanatory drawing to show light spots used in the conventional apparatus as shown in Fig. 1 and an intensity of each light spot; Fig. 3 is a circuit diagram to show a detection system of tracking control signal in the conventional apparatus; Fig. 4A, Fig. 4B, and Fig. 4C are explanatory drawings to show an eccentricity of a recording medium in the conventional apparatus, positional relations of two light spots due to the eccentricity, and a track deviation of the light spots, respectively; Fig. 5 is a constitutional drawing to show a first embodiment of the optical information recording/reproducing apparatus according to the present invention; Fig. 6 is a plan view to show a position sensor and an objective lens in the embodiment of Fig. 5, and a holding structure thereof; Fig. 7 is a cross-sectional drawing along X-X line in Fig. 6; Fig. 8 is a circuit diagram to show a circuit for producing a lens position output from a detection signal of the position sensor in the embodiment of Fig. 5; Fig. 9 is a circuit diagram to show an example of a servo signal detection circuit for producing a tracking control signal, a focus control signal, and a magneto-optical signal in the embodiment of Fig. 5; Fig. 10A, Fig. 10B, and Fig.10C are explanatory drawings to show an eccentricity of the recording medium, an AT offset applied to a tracking control signal based on information about the eccentricity, and track deviations of a light spot for recording and erasing and of a light spot for verification reproduction when the AT offset is applied, respectively; Fig. 11 is a constitutional drawing to show a second embodiment according to the present invention; Fig. 12 is a constitutional drawing to show a third embodiment according to the present invention; Fig. 13 is a block diagram to show an example of the servo signal detection circuit in the embodiment of Fig. 12; Fig. 14A and Fig. 14B are signal wave form drawings to show cross-track signals produced by the servo signal detection circuit of Fig. 13; Fig. 15A and Fig. 15B are explanatory drawings to show deviation states of two light spots with respect to a track without and with application of the AT offset, respectively, in the embodiment of Fig. 12; Fig. 16A and Fig. 16B are signal wave form drawings to show an AT signal produced by the servo signal detection circuit of Fig. 13 and an AT signal with application of the AT offset, respectively; Fig. 17A and Fig. 17B are signal wave form drawings to show differentiation outputs of the cross-track signals differentiated by differentiating circuits in the servo signal detection circuit of Fig. 13; Fig. 18A and Fig. 18B are signal wave form drawings to show cross-track signals in the servo signal detection circuit of Fig. 13 when the light spots cross a track (in one track jump); Fig. 19A and Fig. 19B are signal wave form drawings to show an AT signal in the servo signal detection circuit of Fig. 13 when the light spots cross a track (in one track jump) and an AT signal with application of the AT offset,respectively; Fig. 20A and Fig. 20B are signal wave form drawings to show differentiation outputs of the differentiating circuit in the servo signal detection circuit of Fig. 13 when the optical spots cross a track (in one track jump); Fig. 21 is a block diagram to show a fourth embodiment according to the present invention; and Fig. 22A, Fig. 22B, and Fig. 22C are explanatory drawings to show deviation states of a plurality of light spots tracking-controlled on respective, different tracks, with respect to the tracks without and with application of AT offset.