| 摘要 |
PURPOSE:To provide an optical pickup which can perform the optical output control with high accuracy. CONSTITUTION:The light emitted from a light source 1 is divided by a beam splitter 3 and led to an objective lens 6 and a light receiving element 4. The power of these emitted beams is controlled by the output of the element 4. The reflection factor and the transmission factor partly differ on the light dividing surface 3a of the splitter 3. The dividing ratio of the splitter 3 is not affected by the variance of wavelength of the light emitted from the source 1 by using the splitter 3 instead of a polarized beam splitter. |
