首页>
外国专利>
Diffraction lens for optical recording on DVD and CD-RW disks has number of annular areas of different diffraction effects
Diffraction lens for optical recording on DVD and CD-RW disks has number of annular areas of different diffraction effects
展开▼
机译:用于在DVD和CD-RW光盘上进行光学记录的衍射透镜具有许多具有不同衍射效果的环形区域
展开▼
页面导航
摘要
著录项
相似文献
摘要
The optical pickup system has a pair of light sources and detectors co-operating with a lens system to access either a DVD or CD-RW disk. A wavelength selective element combines the source beams and separates the reflections of each wavelength. Both beams pass through a flat plate lens (35). This has a central area (351) that passes both wavelengths. Outer rings (352,353) include diffraction staircase style gratings that pass one wavelength and focuses the other wavelength.
展开▼