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    • 1. 发明申请
    • POLYETHYLENE NAPHTALATE X-RAY WINDOW
    • 聚乙烯NAPHTALATE X-RAY窗户
    • WO1996019738A1
    • 1996-06-27
    • PCT/IB1995000985
    • 1995-11-09
    • PHILIPS ELECTRONICS N.V.PHILIPS NORDEN AB
    • PHILIPS ELECTRONICS N.V.PHILIPS NORDEN ABVAN DER BORST, Johannes
    • G01T01/185
    • H01J5/18H01J47/004
    • An X-ray window for an X-ray component such as an X-ray detector. Windows of this kind must be as thin as possible so as to minimize X-ray absorption. The known material polypropylene is not available in the desired thickness of the order of 1 mu m, and stretching of this material so as to reduce the thickness causes an inadmissible spread in thickness. The material polyethylene naphtalate (PEN) in accordance with the invention is available in the desired thickness and with a much smaller spread in thickness. Furthermore, the window material should exhibit suitable mechanical properties (such as strength, rigidity and tightness) which are not allowed to degrade significantly under the influence of continuously varying circumstances in respect of pressure, temperature and X-rays. In comparison with the known polyethylene terephtalate (PET), PEN in this respect has better properties which satisfy the mechanical requirements.
    • 用于诸如X射线检测器的X射线成分的X射线窗口。 这种Windows必须尽可能薄,以便使X射线吸收最小化。 已知的材料聚丙烯不能达到所需厚度为1μm的厚度,并且该材料的拉伸以减小厚度导致厚度不允许的扩展。 根据本发明的材料聚萘二甲酸乙二醇酯(PEN)可以期望的厚度获得并且具有小得多的厚度扩散。 此外,窗口材料应当在压力,温度和X射线的连续变化的环境的影响下显示出不允许显着降解的机械性能(例如强度,刚度和密封性)。 与已知的聚对苯二甲酸乙二醇酯(PET)相比,PEN在这方面具有更好的性能,满足机械要求。
    • 3. 发明申请
    • X-RAY TUBE HAVING AN INTERNAL WINDOW SHIELD
    • 具有内部窗户的X射线管
    • WO1998025292A1
    • 1998-06-11
    • PCT/IB1997001454
    • 1997-11-17
    • PHILIPS ELECTRONICS N.V.PHILIPS NORDEN AB
    • PHILIPS ELECTRONICS N.V.PHILIPS NORDEN ABVAN DER BORST, JohannesSTOLK, Johan, Willem
    • H01J35/18
    • H01J35/18H01J2235/165
    • The filament for the emission of the electrons in an X-ray tube inevitably evaporates gradually during operation of the tube. Depending on the location of the filament in the tube, the metal vapor thus released is deposited on the X-ray window of the tube. Consequently, the transmission of the X-ray tube window gradually decreases in the course of the service life of the tube. In order to counteract the deposition of filament material, an edge structure is provided on the inner side of the window; this structure comprises edges which extend perpendicularly to the window surface, and is preferably a honeycomb structure with hexagonal cells. The height of the edges is chosen so that, viewed from the filament, the edge structure forms a shadow zone for the entire X-ray window, so that the metal vapor is deposited on the structure instead of on the window.
    • 用于在X射线管中发射电子的灯丝在管的操作期间不可避免地蒸发。 根据管中灯丝的位置,这样释放的金属蒸气沉积在管的X射线窗口上。 因此,在管的使用寿命的过程中,X射线管窗的透射逐渐减小。 为了抵消长丝材料的沉积,在窗的内侧设置边缘结构, 该结构包括垂直于窗表面延伸的边缘,并且优选地是具有六边形单元的蜂窝结构。 选择边缘的高度使得从灯丝观察,边缘结构形成整个X射线窗口的阴影区域,使得金属蒸汽沉积在结构上而不是在窗口上。