| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical integrated element which is easy to assemble and is small-sized, an optical head device, and an optical disk device.SOLUTION: An optical head device 1 includes a light source unit 21, an objective lens 26, an objective lens actuator 28, a photodetector 33 having a plurality of light receiving surfaces, a polarizing beam splitter 23, a hologram 29, and a reflecting element 35 with a first surface 30 having such wavelength selectivity as to transmit laser light at a prescribed wavelength and reflect laser light at the other wavelengths and with a second surface 31 reflecting and diffracting the laser light at the prescribed wavelength transmitted through the first surface 30 and is configured so that the laser light at the other wavelengths reflected by the first surface 30 impinges on corresponding light receiving surfaces out of the plurality of light receiving surfaces and the laser light at the prescribed wavelength transmitted through the first surface 30 and reflected by the second surface 31 is transmitted through the first surface 30 again and impinges on a corresponding light receiving surface. |
