首页>
外国专利>
Optical pickup device having three light sources with a holographic element for directing diffraction light to photodetectors
Optical pickup device having three light sources with a holographic element for directing diffraction light to photodetectors
展开▼
机译:具有三个光源和全息元件的光学拾取装置,用于将衍射光导向光电探测器
展开▼
页面导航
摘要
著录项
相似文献
摘要
An optical pickup device has three different light sources, a holographic element, beam splitters, and first and second photodetectors. The beam splitters each change an optical path of a light beam coming from the associated light source toward a recording medium and match an optical axis of the changed optical path with an optical axis passing through the holographic element and the first photodetector. Reflected light from the recording medium is divided into zero-order diffraction light and first-order diffraction light by the holographic element. The first photodetector receives the zero-order diffraction light and obtains an RF signal and a tracking error signal. The second photodetector receives the first-order diffraction light and obtains a focusing error signal.
展开▼