公开(公告)号：US5337106A

公开(公告)日：1994-08-09

申请号：US74227

申请日：1993-06-09

申请人： Suganda Jutamulia ,  Hideaki Niwa ,  Shinji Toyoda

发明人： Suganda Jutamulia ,  Hideaki Niwa ,  Shinji Toyoda

IPC分类号： G03B19/12

CPC分类号： G03B19/12

摘要： The mirror in a single-lens-reflex (SLR) camera is eliminated by employing a liquid crystal cell and a polarizing beam splitter. The light from an illuminating lamp (32) is linearly polarized in a horizontal direction by a polarizer (58). The polarized illuminating light is totally reflected by a polarizing beam splitter (PBS) (54) and passes through a quarterwave plate (QWP) (56) and an objective lens (36). After passing through QWP (56) for the second time, the light is vertically polarized and totally passes through PBS (54). A focusing lens (40) focuses the image onto a film (30). A voltage supply (46) is connected to a liquid-crystal (LC) cell (44) by an electric switch (52) that can turn LC cell (44) on or off. When LC cell (44) is off, the polarization of the light is rotated by 90.degree. to be horizontally polarized. Thus the light is reflected by another PBS (48) to a prism (24) for viewing by a user (26). When the LC cell (44) is on, the light polarization is not rotated, and the light is transmitted through the PBS (48) to a mechanical shutter (28). During the shutter's (28) open period, an intense light pulse from a strobe lamp (42) illuminates a patient's eye (38) and exposes film (30). Shutter (28) can be eliminated since the LC cell (44) and the PBS (48) may also function as shutter.

摘要翻译： 通过使用液晶单元和偏振分束器来消除单透镜（SLR）照相机中的反射镜。 来自照明灯（32）的光通过偏振器（58）在水平方向上线性偏振。 偏振照明光被偏振分束器（PBS）（54）全反射并通过四分之一波长板（QWP）（56）和物镜（36）。 经过QWP（56）第二次后，光线被垂直极化，完全通过PBS（54）。 聚焦透镜（40）将图像聚焦到薄膜（30）上。 电压源（46）通过可以使LC单元（44）导通或关闭的电开关（52）与液晶（LC）单元（44）连接。 当LC单元（44）关闭时，光的偏振旋转90°以进行水平极化。 因此，光被另一PBS（48）反射到棱镜（24），以供用户（26）观看。 当LC单元（44）导通时，光偏振不旋转，并且光通过PBS（48）传输到机械快门（28）。 在快门（28）打开期间，来自闪光灯（42）的强烈的光脉冲照亮患者的眼睛（38）并暴露胶片（30）。 可以消除快门（28），因为LC单元（44）和PBS（48）也可以用作快门。

公开(公告)号：US4481666A

公开(公告)日：1984-11-06

申请号：US332213

申请日：1981-12-18

申请人： Hideaki Niwa

发明人： Hideaki Niwa

IPC分类号： G06K9/38 ,  H04N1/40

CPC分类号： G06K9/38 ,  G06K2209/01

摘要： In an apparatus for reading-out features such as characters and marks recorded on an object such as labels, boxes and cards, the object is scanned by a linear CCD array to produce a video signal and a background level is detected from the video signal on the basis of an edge signal derived from the video signal. A plurality of slice levels having span and pitch adjusted according to said background level are generated and the video signal is compared with the slice levels to produce an output video signal. Even if the level of the video signal changes abruptly, it is possible to obtain more accurate output video signal and to remove error in pattern recognition. In another preferred embodiment, an amplitude of the video signal is adjusted by a variable attenuator in accordance with the detected background level.

摘要翻译： 在用于读出记录在诸如标签，盒和卡等物体上的字符和标记的特征的装置中，通过线性CCD阵列扫描物体以产生视频信号，并从视频信号检测背景电平 从视频信号导出的边缘信号的基础。 产生具有根据所述背景级别调整的跨度和音调的多个限幅电平，并且将视频信号与限幅电平进行比较以产生输出视频信号。 即使视频信号的电平突然变化，也可以获得更准确的输出视频信号，并消除图案识别中的错误。 在另一个优选实施例中，根据检测到的背景电平，通过可变衰减器来调整视频信号的幅度。

公开(公告)号：US06471691B1

公开(公告)日：2002-10-29

申请号：US09378211

申请日：1999-08-19

申请人： Koji Kobayashi ,  Toru Hirano ,  Shigeru Sakamoto ,  Hideaki Niwa ,  Akira Obana ,  Tokuhiko Miki

发明人： Koji Kobayashi ,  Toru Hirano ,  Shigeru Sakamoto ,  Hideaki Niwa ,  Akira Obana ,  Tokuhiko Miki

IPC分类号： A61B1820

CPC分类号： A61F9/008 ,  A61B2018/20359 ,  A61F2009/00863

摘要： An ophthalmic treatment apparatus uses therapy and diagnostic laser light sources whose beams are deflected two-dimensionally via an optical deflector and a galvanomirror and directed on the eye fundus to produce a fundus image on a display monitor. A photosensitive substance that accumulates specifically in neovascular regions is administered to the patient to define the region where the neovascular tissues are located. When the region is to be treated, the therapy laser light source is activated and its intensity is amplified by a controller and a driver for driving a light modulator. This arrangement assures a reliable definition of the affected region and enables only the neovascular tissues to be destroyed or sealed off because the laser intensity can be amplified at the region concerned.

摘要翻译： 眼科治疗装置使用治疗和诊断激光光源，其光束经由光学偏转器和电流镜二维偏转并且引导到眼底以在显示监视器上产生眼底图像。 向患者施用特别积聚在新生血管区域的感光性物质，以限定新生血管组织所在的区域。 当要处理该区域时，治疗激光光源被激活，并且其强度被控制器和用于驱动光调制器的驱动器放大。 这种布置确保了受影响区域的可靠定义，并且仅使新血管组织被破坏或密封，因为激光强度可以在相关区域被扩增。