OPTICAL INTEGRATED UNIT AND OPTICAL PICKUP DEVICE PROVIDED WITH IT

摘要

An optical integrated unit and an optical pickup device capable of easily preventing such troubles as erroneous detections. The light receiving surface (36) of a light receiving unit (25) is divided into one light receiving area (38a) and the other light receiving area (38b) with respect to a virtual one plane (37), and one light receiving area (38a) is subdivided into first, third and fifth light receiving area portions (41, 43, 45) and the other light receiving area (38b) into second, fourth and sixth light receiving area portions (42, 44, 46). The first to third diffraction planes (31a-31b) of a hologram (31) guide a laser beam toward first to sixth light receiving area portions (41-46) of the light receiving unit (25). An optical element (32) is provided between the light receiving unit (25) and a hologram (431) so as to transmit part (La1) of a diffraction light diffracted by the first diffraction plane (31a) of the hologram (31) and guide it to the first light receiving area portion (41) in one light receiving area (38a), and to transmit part (Lb2) of a diffraction light diffracted by the second diffraction plane (31b) and guide it to the fourth light receiving area portion (44) in the other light receiving area (38b).