| 摘要 |
PURPOSE:To stably detect a reproducing signal in a high band area by setting the output of a photoelectric transducer to detect the central part of the irradiation spot of reflected light as an information reproducing signal. CONSTITUTION:A first photoelectric transducer 13B arranged at an irradiation position that is not the convergence point of the reflected light from an optical information recording medium and also to detect the central part of the irradiation spot, and second photoelectric transducers 13A and 13C to detect a part other than the central part of the irradiation spot are provided. And the output of the first photoelectric transducer 13B is set as the information reproducing signal, and also, the difference of the output of the first photoelectric transducer 13B and the second photoelectric transducers 13A and 13C is set as a focus detecting signal. In such a way, it is possible to obtain the information reproducing signal by signals from photoreceiving parts less than three out of photodetectors 13 and to stably detect the information reproducing signal in the high band area. |
