Light guide path element and optical pickup

摘要

A light guide path element is provided with: a first light guide path for guiding a light beam having a first wavelength; a second light guide path for guiding a light beam having a second wavelength; a first separating device for irradiating the light beam having the first wavelength irradiated from a first light source onto an information record medium and transmitting a light beam reflected therefrom; a second separating device for irradiating the light beam having the second wavelength irradiated from a second light source onto an information record medium and transmitting a light beam reflected therefrom; a first grating for input-coupling one portion of the light beam transmitted through the first separating device to the first light guide path and transmitting another portion of the light beam transmitted through the first separating device; a second grating for input-coupling one portion of the light beam transmitted through the second separating device to the second light guide path and transmitting another portion of the light beam transmitted through the second separating device; a first light receiving portion for receiving the light beam transmitted through the first grating or the second grating; a second light receiving portion for receiving the light beam guided by the first light guide path; and a third light receiving portion for receiving the light beam guided by the second light guide path.