| 摘要 |
PROBLEM TO BE SOLVED: To obtain a satisfactory signal characteristic by forming dielectric reflection films on presribed positions of substrates constituting an optical guide member to make the absorption loss of light small and to make the resistance to an organic solvent, etc., large. SOLUTION: This pickup has plural substrates inclined with respect to the incident light irradated from a light source 1 and also has reflection films formed in the optical path of the substrates by being laminated with plural dielectric layers. Then, the light returned by being reflected form an optical medium is guided to prescribed positions by an optical guide member and the lights are received by light receiving means 13 and also light signals are transducer into electric signals. The reflection films are formed on the prescribed positions of the surfaces of the substrates constituting the optical guide member and reflect the incident light to guide it to prescribed positions. Then the reflection film is formed by alternately laminating the dielectric film having a high refractive index and the dielectric film having a low refractive index. |
