公开(公告)号：US6160646A

公开(公告)日：2000-12-12

申请号：US520662

申请日：2000-03-07

申请人： Shinichi Takahashi ,  Masayuki Koyama

发明人： Shinichi Takahashi ,  Masayuki Koyama

IPC分类号： G02B5/32 ,  G11B7/00 ,  G11B7/135 ,  G02B5/18 ,  G11B7/12

CPC分类号： G11B7/1353 ,  G02B5/32 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/1398 ,  G11B2007/0006

摘要： A two-focal-point pickup device capable of suppressing the generation of glitch or bump in reproduced signal. The optical pickup device irradiates a light beam emitted from a light source onto an optical recording medium to form a light spot on a track of a recording surface of the optical recording medium to read the optical recording medium while controlling the position of the light spot relative to the track of the recording surface. The optical pickup device includes a converging lens section coaxially disposed in an optical axis of the light beam to converge the light beam onto the recording surface; and a hologram lens section coaxially disposed in the optical axis of the light beam to diffract the light beam. The hologram lens section has a diffraction grating pattern being formed in such a manner that a first-order diffraction light of the light beam caused by the hologram lens section and converged on the recording surface has a first numerical aperture existing in a direction intersecting the track extending direction and a second numerical aperture existing in the track extending direction. The first numerical aperture is less than the second numerical aperture. The hologram lens section has a diffraction grating pattern which is a double side cut circular diffraction grating pattern formed by eliminating two symmetrical portions with the optical axis from a circular diffraction grating pattern. The hologram lens section has a diffraction grating pattern which is a double side cut circular diffraction grating pattern formed by eliminating two symmetrical portions with the optical axis from a circular diffraction grating pattern.

摘要翻译： 一种双焦点拾取装置，其能够抑制再现信号中的毛刺或凸起的产生。 光学拾取装置将从光源发射的光束照射到光学记录介质上，以在光记录介质的记录表面的轨道上形成光点，以便在控制光点相对位置的同时读取光记录介质 到记录表面的轨迹。 光拾取装置包括同轴地设置在光束的光轴上以将光束会聚到记录表面上的会聚透镜部分; 以及同轴地设置在光束的光轴上以衍射光束的全息透镜部分。 全息透​​镜部分具有衍射光栅图案，其方式是使由全息透镜部分引起并会聚在记录表面上的光束的一级衍射光具有存在于与轨道交叉的方向上的第一数值孔径 延伸方向和存在于轨道延伸方向上的第二数值孔径。 第一数值孔径小于第二数值孔径。 全息透​​镜部分具有衍射光栅图案，该衍射光栅图案是通过从圆形衍射光栅图案中消除光轴的两个对称部分而形成的双侧切割圆形衍射光栅图案。 全息透​​镜部分具有衍射光栅图案，该衍射光栅图案是通过从圆形衍射光栅图案中消除光轴的两个对称部分而形成的双侧切割圆形衍射光栅图案。

公开(公告)号：US5530843A

公开(公告)日：1996-06-25

申请号：US207204

申请日：1994-03-08

申请人： Masayuki Koyama

发明人： Masayuki Koyama

IPC分类号： G06F9/45 ,  G06F17/50

CPC分类号： G06F17/5045

摘要： A logic description conversion apparatus and a logic description conversion method are obtained according to which logic descriptions which include a long-term operation logic part which operates at an operation clock which is longer than a reference operation clock are converted into more advanced logic descriptions from which a logic circuit is accurately created. A source code which is formed by logic descriptions which includes a multi-clock transfer path (long-term operation logic part), is generated to a reference table which includes information about input control logic of an extracted register. Based on an indicator in which register name information of a receiving side of the multi-clock transfer path is registered and the reference table, the source code is converted into a source code which is formed by logic descriptions in which the long-term operation logic part and the input control logic are logically separated from each other. Since the long-term operation logic part and the input control logic are logically separated from each other, a logic circuit is accurately created by logic synthesis.

摘要翻译： 获得逻辑描述转换装置和逻辑描述转换方法，其中包括在比参考操作时钟长的操作时钟上操作的长期操作逻辑部分的逻辑描述被转换成更高级的逻辑描述， 准确地创建逻辑电路。 由包括多时钟传送路径（长期操作逻辑部分）的逻辑描述形成的源代码被生成到包括关于提取的寄存器的输入控制逻辑的信息的参考表。 基于其中登记了多时钟传送路径的接收侧的寄存器名称信息和参考表的指示符，源代码被转换成由逻辑描述形成的源代码，其中长期操作逻辑 部分和输入控制逻辑在逻辑上彼此分离。 由于长期操作逻辑部分和输入控制逻辑在逻辑上彼此分离，所以通过逻辑合成来精确地创建逻辑电路。