Optical pickup having single optical detection for dual wavelength

摘要

The optical pickup 100 of the present invention is a light source 110 , beam splitter 120, a collimator lens 130 , and an objective lens 140 and the photodetector 160, the light source 110 is provided with a light source and a light source for BD, DVD and blue wavelengths are separated from each other , the beam splitter 120 is a square body shape and a position in front of the light source 110 and the diffraction grating having both 121 and the hologram 122, the collimator lens 130 is positioned in front of the beam splitter 120 , objective lens 140, a BD for and designed to be automatically replaced with a light beam for the light beam for DVD, photodetector 160, a beam splitter 120 and the perpendicular position , and detecting the frequency signal and the error signal by a wave rectify all of the other two light sources to have a new detection patterns .