公开(公告)号：US5285438A

公开(公告)日：1994-02-08

申请号：US785742

申请日：1991-10-31

申请人： Philippe J. Marchand ,  Ashok V. Krishnamoorthy ,  Pierre Ambs ,  Kristopher Urquhart ,  Sadik C. Esener ,  H. Sing Lee

发明人： Philippe J. Marchand ,  Ashok V. Krishnamoorthy ,  Pierre Ambs ,  Kristopher Urquhart ,  Sadik C. Esener ,  H. Sing Lee

IPC分类号： G03H1/26 ,  G11B7/0065 ,  H04N1/41 ,  H04N7/30 ,  G11B7/00

CPC分类号： H04N19/60 ,  G03H1/26 ,  G11B7/0065 ,  G03H2210/40 ,  G03H2270/22

摘要： A motionless parallel head reads an optical disk having an active surface encoded with an arrayed multiplicity of one-dimensional holograms. Each 1-D hologram is a computer-encoded representation of, typically, one 128 pixel slice of an image. A group, typically 128, 1-D holograms are positionally distributed, and positionally shifted or staggered one to the next, radially along the disk's active surface so as to fit a complete radius. Typically 14,000 groups are circumferentially-displaced around a 51/4" Compact Disk (CD), forming a herringbone pattern. During readout the encoded CD is simultaneously illuminated along the entirety of one of its radius lines within which a group of holographic data blocks are fitted. The illuminated group of holographic data blocks are optically transformed in parallel by one or more lenses, and preferably by a Hybrid refractive/diffractive Optical Lens (HOL), so as to two-dimensionally spatially encode the wavefront of the light beam by which the group of holographic data blocks was illuminated. The 2-D spatially-encoded light beam is detectable by an array of light detectors. When the disk is rotated then sucessive groups of holographic data blocks that are fitted along successive radius lines are successively retrieved, group by group, at a typically 1.1 Gbyte/sec rate. Such an optical memory is useable as the secondary storage of a high performance optoelectronic associative memory system.

摘要翻译： 静止平行头读取具有编码有排列的多维一维全息图的活性表面的光盘。 每个1-D全息图是通常是图像的一个128像素切片的计算机编码表示。 一组通常为128个1-D全息图的位置分布，并且沿着盘的有效表面径向地位移或交错一个到下一个，以便适合完整的半径。 通常，14,000组围绕51/4“压缩盘（CD）周向移位，形成人字形图案。在读出期间，编码的CD同时沿着其一个半径线的整个照明，其中一组全息数据块是 通过一个或多个透镜，优选地通过混合折射/衍射光学透镜（HOL）将全息数据块的照明组并行光学变换，以二维空间编码光束的波前，由此， 全息数据块被照亮，二维空间编码的光束可以通过光检测器阵列检测，当光盘旋转时，依次检索沿连续半径线拟合的全息数据块组， 按照一般的1.1Gbyte /秒的速率，这种光学存储器可用作高性能光电关联备忘录的二次存储 ry系统。