| 摘要 |
PURPOSE: To obtain an optical pickup in which the generation of wave front aberration is suppressed and the occurrence of a malfunction is reduced. CONSTITUTION: A diffusion angle converting hologram 7, a diffraction grating 6 and a first beam splitter film 9 are arranged in a second substrate 201 so that the incident light beam from light source 1 does not pass the bonding material layers which join the plural substrates constituting an optical guide member 5. Thus, the light beam emitted from the source 1 is reflected only in the substrate 201. |
