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    • 4. 发明授权
    • Liquid-crystal image converter device
    • 液晶图像转换装置
    • US4368386A
    • 1983-01-11
    • US231117
    • 1981-02-03
    • Jean-Pierre HuignardSerge Le BerreChristian MayeuxFrancois Micheron
    • Jean-Pierre HuignardSerge Le BerreChristian MayeuxFrancois Micheron
    • G03B42/02A61B6/00G02F1/135G09F9/00H04N5/74
    • G02F1/135
    • The invention provides an image converter device which utilizes a liquid crystal cell in which a layer of a nematic material or a nematic-cholesteric mixture is enclosed between a first plate of a photoconductive material, provided with an external electrode, and a second transparent plate, provided with an internal electrode. The photoconductive material may be bismuth oxide, or a mixture of the latter with germanium or silicon oxide. A direct or alternative voltage is applied between the electrodes. An X-rays image, or an image displayed on the screen of a C.R. tube is projected onto the photoconductive plate whose conductivity, thus spatially modulated, causes a spatially variable voltage to be applied in the liquid crystal layer. Various electro-optical effects, such as dynamic scattering, controlled birofringence or controlled rotatory polarization in a twisted structure, can be used to make the projected image to appear in the liquid crystal layer illuminated by a visible light read-out beam and be directly observed or enlarged by projection onto a screen.
    • 本发明提供了一种图像转换器装置,其利用液晶单元,其中在具有外部电极的光导材料的第一板和第二透明板之间包含向列型材料或向列型胆甾型混合物层, 设置有内部电极。 光电导材料可以是氧化铋或其后者与锗或氧化硅的混合物。 在电极之间施加直接或替代的电压。 将X射线图像或显示在C.R.管的屏幕上的图像投影到导电性板上,其导电性由此被空间调制,导致在液晶层中施加空间上可变的电压。 可以使用各种电光效应,例如在扭曲结构中的动态散射,受控制的生物刺激或受控的旋光极化,使得投射的图像出现在由可见光读出光束照射的液晶层中并被直接观察 或通过投影放大到屏幕上。
    • 10. 发明授权
    • Electrostatic image sensor having an electret which polarizes a
photoconductive layer
    • 具有使光电导层极化的驻极体的静电图像传感器
    • US4818857A
    • 1989-04-04
    • US106262
    • 1987-10-09
    • Francois MicheronDominique Broussoux
    • Francois MicheronDominique Broussoux
    • G03B42/02A61B6/00G01T1/14G01T1/29H01L31/08H04N1/113H04N5/335H01J31/50H01J40/14
    • G01T1/14G01T1/246G01T1/2935H01L31/085
    • An embodiment of the electrostatic image sensor comprises essentially two electrodes, one layer of photoconductive material and one dielectric layer comprising an electret designed to polarize the photoconductive layer without requiring a voltage source during the recording of an image. During a recording stage, a change-over switch short-circuits the electrodes. Photocarriers are released by the X-rays that have crossed an object to be radiographed. The said photocarriers move in the electrical field created by the electret and tend to cancel the electrical field at the interface between the two layers. During a reading stage, the change-over switch connects the electrodes to the inputs of a current amplifer while a light beam scans the layer of photoconductive material. The photocarriers move and completely cancel the electrical field at every point of the interface between the two layers. The current detected by the amplifier makes it possible to display an image on a cathode ray tube. During an initialization stage, the layer of photoconductive material is brought to the neutral state by means of a direct voltage generator connected to the electrodes by the change-over switch.
    • 静电图像传感器的一个实施例基本上包括两层电极,一层光电导材料和一层介电层,其中包括驻极体,该驻极体被设计成使光电导层极化,而在记录图像期间不需要电压源。 在记录阶段,切换开关短路电极。 照片载体被X射线释放,X射线已经穿过要被放射照相的物体。 所述光载流子在由驻极体产生的电场中移动,并且倾向于消除两层之间的界面处的电场。 在读取阶段,转换开关将电极连接到电流放大器的输入端,同时光束扫描光电导材料层。 光载体在两层之间的界面的每个点移动并完全消除电场。 由放大器检测的电流使得可以在阴极射线管上显示图像。 在初始化阶段期间,光电导材料层通过转换开关连接到电极的直流电压发生器进入中立状态。