Abstract:
A light and charged particle image intensifier (10) receives incident image conveying light or charged particles {«incident beam») (12) and provides to data processing and video equipment signals from which the image conveyed by the incident beam (12) can be constructed and displayed. The beam (12) that is being processed includes visible light reflected from objects and X-ray radiation that has been passed through an object such as a human body. The image intensifier includes a scintillator (14) and photocathode unit (16) for converting the incident beam (12) to photoelectrons (18) and a charge-coupled device («CCD») (52) for detecting the photoelectrons (18) and transmitting to the data processing and video equipment information relating to the quantity or energy level as well as the location of the electrons (18) impinging on the sensing areas (54 or Sl to SN) of the CCD (52). From this information, the data processing and video equipment can reconstruct the image conveyed by the incident beam (12). The sensitivity of the device is increased either by imposing an electric field across the photocathode (16) and the CCD (52) to accelerate the photoelectrons or by placing a micro channel processor («MCP») (20) between the photocathode (16) and the CCD (52) to increase the number of electrons that impinge on the CCD (52). Alternately, a silicon diode target (42) can be used instead of a CCD (52) to intercept the electrons and an electron beam gun (44) can be used to detect the location and intensity of the charges created on the target (42) by the impinging electrons. Finally, a grid (24) having a number of windows can be used instead of a CCD (52) or a silicon target (42) to detect the location of the electron streams and a photoanode (25) can detect their intensity.
Abstract:
A wristworn device comprising a radio communication device for receiving from and/or transmitting signals to a radio communication device external to the wristworn device. In at least one embodiment, the casing comprises a metallic watchcase having a slot, and wherein the watchcase is electrically coupled to the radio communication device to function as the antenna. In another embodiment, a metallic loop is provided in the casing proximate the watchcase, wherein the metallic loop is electrically coupled to the radio communication device to function as the antenna and the watchcase comprises a slot and functions as an element for the reception and/or transmission of electromagnetic radiation. In a third embodiment, the metallic watchcase does not have a slot and the watchcase is electrically coupled to the radio communication device to function as the antenna.
Abstract:
The invention can be used in the production of electron beam tubes. The fundamental problem addressed by the invention is that of enhancing the efficiency and power of electron beam tubes while reducing the quantity of X-rays emitted by them. The problem is solved according to the invention by providing the tube with an electroconductive base (9) on which is mounted a semiconductor layer (6), and an element (12) by which the surface of the laser target facing the electron gun (2) is electrically connected to the base (9), the electron gun (2) and associated control system being configured obliquely to the semitransparent reflecting layer (5) at an angle (gamma)
Abstract:
The invention relates to flat display terminals based on cold emission cathodes. The inventive cold emission film cathode comprises an insulated base which can be made of glass, and fitted with a nano-crystalline carbon film emitter arranged thereon. Said emitter is embodied in the form of grains of a monolayer of a powder of a refractory material having a grain size ranging from 10 to 10 , said grains being covered with a nano-crystalline carbonaceous film. The inventive flat display terminal comprises flat glass plates on one of which a system of cold emission cathodes, embodied in the form of busbars, is arranged. Said invention makes it possible to use cheap glass and even polymeric materials for manufacturing a cathode unit of the display terminal, in addition to the use of standard processing for glueing and vacuum-pumping the display terminal.
Abstract:
The invention relates to flat display terminals based on cold emission cathodes. The inventive cold emission film cathode comprises an insulated base which can be made of glass, and fitted with a nano-crystalline carbon film emitter arranged thereon. Said emitter is embodied in the form of grains of a monolayer of a powder of a refractory material having a grain size ranging from 10 to 10 , said grains being covered with a nano-crystalline carbonaceous film. The inventive flat display terminal comprises flat glass plates on one of which a system of cold emission cathodes, embodied in the form of busbars, is arranged. Said invention makes it possible to use cheap glass and even polymeric materials for manufacturing a cathode unit of the display terminal, in addition to the use of standard processing for glueing and vacuum-pumping the display terminal.
Abstract:
A laser electron-beam tube comprises an electron-beam source housed in a vacuum chamber and a laser target. The laser target consists of partially transparent reflecting layers and highly reflecting layers, all accommodated on a substratum; interspersed with these are at least two layers of an active semiconductor material and layers of a passive semiconductor material alternating therewith, with corresponding narrower or wider exclusion zones. The semiconductor materials are crystals whose lattice periods differ in the free state by more than 0.1%. The layers are under elastic tension and have a thickness below the critical thickness.
Abstract:
A night vision system along with an image intensifier tube and method for shuttering the continued draw of electrons from an electron multiplier are provided. The night vision system includes the electron multiplier, or possibly two electron multipliers, each comprising a silicon membrane. A shutter voltage is applied between a first surface and a substantially parallel, opposed second surface of the silicon membrane to discontinue draw of electrons through the electron multiplier and for substantially discontinuing display of an image from the image intensifier tube under certain bright light conditions. Utilizing a global shutter control on the electron multiplier, and the significantly lower voltage for such control mitigates power consumption within the image intensifier, as well as electromagnetic interference and delay response time. A relatively low voltage negative bias shutter voltage on only the electron multiplier selectively provides global shutter to the image intensifier device.
Abstract:
The invention can be used in systems based on projection electron-beam tubes, X-ray tubes, laser electron-beam tubes and in particular in laser scanners. The basic problem was to enhance the operational characteristics of the device and to increase its operating life. This is achieved according to the invention in the following way: the outer surface of the electron-beam tube casing (1) at the electron gun (3) end, which is housed within an electroconductive earthed casing (12), is provided with an electroconductive high-resistance covering layer. The base (2) end of the said layer is at the same potential as the cathode voltage source (5); the end nearer the active element (4) is earthed, while the electrconductive earthed casing (12) is filled with gas.