| 摘要 |
PURPOSE: To provide an optical pickup with high reliability by providing a photodetectors group respectively light receiving luminous fluxes branched by a metallic one-dimensional lattice formed so that a ratio between a lattice cycle and the thickness of a metallic conductor constituting a lattice becomes a prescribed value. CONSTITUTION: The optical pickup 11 consists of a waveguide body 13 emitting incident light from a laser light source by diffraction, photodetectors 14a, 14b arranged on a prescribed position downward the body 13 and a supporting part 15 supporting them. The incident light irradiation surface of the waveguide body 13 is sloped for the light source, and a beam splitter film 16 is arranged on the incident light irradiation surface, and the metallic one-dimensional lattice 17 formed so that the ratio h/d between the lattice period d and the thickness h of the metallic conductor constituting the lattice becomes about 0.1 or above is arranged on the irradiation area of the waveguide body 13 inside of the luminous fluxes through the film 16. A total reflection film 18 is arranged on the irradiation area of the luminous fluxes reflected by the lattice 17, and one side photodetector 14b is arranged on the corresponding part of the irradiation area of the luminous fluxes totally reflected by the total reflection film 18. |
