| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup device capable of correctly monitoring light source light without being influenced by return light, without increasing, the device scale and moreover, without being required for high assembling positional precision. SOLUTION: The number of parts for obtaining monitor light is reduced by detecting light source light emitted from a light source 21 (or 22) and reflected by the part of the surface 28a of an objective lens 30 side of a wavelength synthesizing prism 28 as monitor light Pm by a monitor light receiving element 35 (or 36). At this time, since the light source light reflected by the part of the surface 28a of the objective lens 30 side of the wavelength syntesizing prism 28 is converged by an optical element such as a coupling lens 25 (or 27) and is detected by the monitor light receiving element 35 (or 36), the return light made incident on a signal detection light receiving element 31 (or 32) is controlled and a function for correctly detecting signals is maintained. |
