| 摘要 |
PURPOSE:To provide the optical device which can exactly set the incident angle in the diagonal direction of a semiconductor laser. CONSTITUTION:A silicon substrate 13 provided with a photodetector 6 is installed on a transparent substrate 2. A silicon substrate 13 is mounted with the semiconductor laser 1 on the diagonal direction flank formed by anisotropic etching. Plural pieces of optical elements including a reflection type collimator lens 3, reflection type twin lenses 5 and a transmission type objective lens 4 are formed on the other surface of the transparent substrate 2. The oscillated light from the semiconductor laser 1 is introduced to the transparent substrate 2 and is made into propagated light 8. This light is propagated zigzag in the transparent substrate 2 and is made incident successively on plural pieces of the optical elements 3, 5, 4 from which the light is emitted and is condensed onto the optical disk 7. The reflected light 10 is made incident successively on the transmission type objective lens 4 and the reflection type twin lenses 5 and is condensed to the photodetector 6, by which the signals of the optical disk 7 are read. |
