摘要:
An image intensifier tube is provided that has a microchannel plate (MCP), a photocathode and phosphor screen deposited on a fiber optic substrate. A first spacer is positioned between the microchannel plate and the fiber optic substrate. A second spacer is positioned between the fiber optic substrate and the photocathode. The first and second spacers cooperate to provide a spatial relationship among the MCP, phosphor screen and photocathode for effective operation of the image intensifier tube.
摘要:
An image intensifier tube is provided that has a microchannel plate (MCP), a photocathode and phosphor screen deposited on a fiber optic substrate. A first spacer is positioned between the microchannel plate and the fiber optic substrate. A second spacer is positioned between the fiber optic substrate and the photocathode. The first and second spacers cooperate to provide a spatial relationship among the MCP, phosphor screen and photocathode for effective operation of the image intensifier tube.
摘要:
An X-ray imaging apparatus which can be produced at reduced costs of components and assembly and which includes a camera free from the limitation of a rotation angle even when an object is rotated. The X-ray imaging apparatus (1) comprises an imaging unit (31) having an integrally rotatable structure including a lens (33), an imaging device (37), and substrate (53, 57) carrying a circuit for driving the imaging device and a circuit for processing image signals obtained from the imaging device. Even when an X-ray intensifier tube and an X-ray generator are rotated round the object, the output can be displayed as an erect image on a monitor, whenever necessary. Because component accuracy of a necessary level is secured for only the connection portion of the lens and the substrate, the cost of the components can be reduced. Accordingly to this construction, deviation of the center axis passing through the output screen of the X-ray image intensifier tube and the center of the imaging device of the imaging apparatus hardly exists, and an X-ray image imaging apparatus not generating a focus error can be provided at a low cost.
摘要:
A night vision device (10) includes an improved power supply (62) that regulates the output brightness of the image intensifier tube (14) of the device (10) according to the two functions of MCP voltage control and photocathode gating duty cycle control. These two functions operate in sequence - the MCP voltage control operates prior to the duty cycle control with increasing input illumination to the image intensifier - in order to provide automatic brightness control and bright source protection while maximizing the high light level image resolution and maintaining the signal-to-noise ratio of the image intensifier at an acceptably high level.
摘要:
A night vision device (10) which applies a time-varying voltage to the photocathode (20) of the device (10) during periods of high average light intensity from a scene being viewed. The purpose of applying this time-varying voltage during periods of high average light intensity is to reduce the average current through the photocathode (20), thus increasing reliability for the night vision device (10) while preserving image resolution.
摘要:
An X-ray image tube comprises a vacuum enclosure, which includes an input window for passing X rays, a metallic frame fitted with the input window, a body, and an output window. The input window and the metallic frame are joined hermetically by ultrasonic welding. The X-ray image tube reduces the distortion of the electron lens formed in the vacuum enclosure.
摘要:
A night vision device (10) includes an improved power supply (62) that regulates the output brightness of the image intensifier tube (14) of the device (10) according to the two functions of MCP voltage control and photocathode gating duty cycle control. These two functions operate in sequence - the MCP voltage control operates prior to the duty cycle control with increasing input illumination to the image intensifier - in order to provide automatic brightness control and bright source protection while maximizing the high light level image resolution and maintaining the signal-to-noise ratio of the image intensifier at an acceptably high level.
摘要:
In a streak apparatus including a streak tube 1 having a vacuum container 1a which has a photocathode 3 at its one end and an output surface 6 at its other end, an accelerating electrode 4 for accelerating photoelectrons, a deflecting electrode 5 formed of a pair of electrodes, and a plurality of focusing magnetic flux generators 12a and 12b for focusing the photoelectrons emitted from the photocathode 3, a deflecting voltage generation circuit 10, an acceleration voltage generation circuit 9, and drive power supplies 13a and 13b for supplying a current to the focusing magnetic flux generators, the plurality of focusing magnetic flux generators 12a and 12b form a main focusing electron lens for forming an electron image, formed on the photocathode 3, on the output surface, and a prefocus lens arranged between the photocathode and main focusing electron lens to focus the photoelectrons, emitted from the photocathode 3, toward the center of the main focusing electron lens.
摘要:
An X-ray image tube according to the present invention has a whole evacuated envelope comprising an metallic input window through which X-rays pass, a metallic frame to which the metallic input window is welded, a hollow cylinder portion, an output window, etc., and the metallic input window and the metallic frame are hermetically welded to each other by ultrasonic welding. By means of such a construction, an X-ray image tube which can suppress occurrence of distortion of an electronic lens formed in the evacuated envelope, and a manufacturing method thereof is realized.
摘要:
A night vision device (10) includes an image intensifier tube (14) which includes a photocathode (22) responsive both to white light and to infrared light to release photoelectrons. The photocathode (22) is particularly sensitive to infrared light at the 980 nm wavelength, and has desirable spectral response characteristics.