Abstract:
PROBLEM TO BE SOLVED: To provide a transmission type radiation generating device which efficiently releases heat generated at a target and ensures a shielding function against unnecessary radiation, and a radiographic apparatus using the same.SOLUTION: A transmission type radiation generating device comprises: an electron source 3; a base plate 11 transmitting radiation; a target 12 which is provided on a surface of the base plate 11 on the side of the electron source 3 and generates the radiation by irradiation with electrons emitted from the electron source 3; a shielding member 13 having radiation passing holes for passing the radiation transmitted the base plate 11, connected to the base plate 11, and provided with at least a front shielding part 9 protruding from the target 12 in a direction away from the electron source 3; and an insulation fluid coming into contact with the front shielding part 9. The shielding member 13 includes a low-melting metal or low-melting alloy 10, which is positioned at least inside the front shielding part 9.
Abstract:
PROBLEM TO BE SOLVED: To provide a transmission X-ray generator capable of improving X-ray generation efficiency by effectively utilizing electrons reflected by a transmission target, and to provide an X-ray imaging device using the transmission X-ray generator.SOLUTION: A transmission X-ray generator includes an electron passage path 8 and a transmission target 9c provided on a target support substrate 9a, and generates X-rays by irradiating the transmission target 9c with electrons via the electron passage path 8. The transmission target 9c is provided in a central region of the target support substrate 9a, and at least a part of a peripheral region of the target support substrate 9a not covered with the transmission target 9c has higher transparency to the X-rays generated by making the electrons reflected from the transmission target 9c incident on the internal wall surface of the electron passage path 8, compared with the central region of the target support substrate 9a covered with the transmission target 9c.
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation generating apparatus that can be used continuously for a long time, by adopting such a configuration that a brazing filler metal is not irradiated directly with an electron beam, thereby minimizing loss of vacuum in a radiation generation tube and generating radiation stably, and to provide a radiographic device using the same.SOLUTION: In the radiation generating apparatus including a radiation shielding member 7 with an electron passage 8 having both open ends, electrons entering from one end of the electron passage 8 impinge on a target 9 provided on the other end side of the electron passage 8 to generate radiation, and circumference of the surface of the target 9 on the side irradiated with electrons is brazed to a target support surface 7b provided on the radiation shielding member 7 around the other end side of the electron passage 8. The diameter of cross section in the opening on the other end side of the electron passage 8 is larger than the diameter of cross section at the one end of the electron passage 8.
Abstract:
PROBLEM TO BE SOLVED: To provide a radiolucent target structure which has a target layer and a substrate supporting it and which can prevent the removal of the target layer at an interface between the substrate and the target layer, a radiation generator equipped with the target structure and a radiography system.SOLUTION: Provided is a radiolucent target structure having, on a substrate 2, a target layer 3 formed with a thickness of 20 μm or less to generate radiation when irradiated with electrons. The surface of the target layer 3 is provided with irregularities. The depth of recesses are equal to or deeper than a half of the thickness of the target layer 3.
Abstract:
PROBLEM TO BE SOLVED: To form a voltage supply line to a target 102 while preventing emission of unwanted X-rays without inhibiting diffusion of heat generated from the target 102 to a substrate 101, and without being restricted significantly, in a target structure incorporating the target 102 that emits X-rays by irradiation with an electron beam 104.SOLUTION: A target 102 is provided in the central region of a substrate 101, and a first conductive member 103a for supplying a voltage to the target 102 is provided in the peripheral region of the substrate 101 not covered with the target 102, excepting a region overlapping the target 102, so as to be in contact with the peripheral region of the target 102 and connected electrically therewith.
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation generator in which a target is not damaged and size and weight can be reduced.SOLUTION: In the radiation generator, a second shielding body 21, a target 16 and a first shielding body 20 are arranged in the order from an electron emission source 1 side. The shortest distance from a position where the target 16 has the highest radiation intensity to the first shielding body 20 is shorter than the shortest distance from the position where the target 16 has the highest radiation intensity to the second shielding body 21.
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation generating apparatus with high reliability capable of shielding unwanted radiation and cooling a target with a simple structure, and being reduced in size and weight, and a radiation imaging apparatus having the same.SOLUTION: The radiation generating apparatus is characterized: that a transmission type radiation tube is housed in a storage container filled with a cooling medium; the transmission type radiation tube comprises an envelope having an opening part, an electron emission source provided facing the opening part of the envelope inside the envelope, a transmission substrate for transmitting radiation, a target arranged on a surface at the electron emission source side of the transmission substrate and generating the radiation by being irradiated with electrons emitted from the electron emission source, a shielding body for shielding the radiation emitted from the target, and a heat insulation part provided between the transmission substrate and the cooling medium; the shielding body comprises a passage communicating with the opening of the envelope; the transmission substrate is provided in the passage of the shielding; and the cooling medium contacts with at least part of the shielding body.
Abstract:
PROBLEM TO BE SOLVED: To provide a transmission type radiation tube with high reliability capable of being driven and generating radiation for a long time by suppressing an increase in temperature of a transmission substrate, and a radiation imaging apparatus.SOLUTION: In the radiation generating apparatus, a transmission type radiation tube 11 is housed in a storage container 12 filled with a cooling medium, the transmission type radiation tube comprises an envelope 14 having an opening part 14a, an electron emission source 15 provided facing the opening part 14a of the envelope inside the envelope, a transmission substrate 19 for transmitting radiation, a target 18 arranged on a surface at the electron emission source side of the transmission substrate 19 and generating the radiation by being irradiated with electrons emitted from the electron emission source 15, and a shielding body 20 for shielding the radiation emitted from the target, the shielding body projects to the outside of the envelope 14 and comprises a passage 20a communicating with the opening 14a of the envelope 14, at least part of the transmission substrate 19 provided in the passage 20a is arranged so as to project to the outside of an external wall of the envelope 14, and the cooling medium contacts with at least part of the shielding body 20.
Abstract:
PROBLEM TO BE SOLVED: To suppress reduction of a lifetime of an electron-emitting device caused by rise of inert gas partial pressure of an image display apparatus in a non-display state. SOLUTION: The apparatus has a rear plate including the electron-emitting device, a face plate including an anode electrode, a voltage applying means applying voltage to the anode electrode, a switching means switching between a display state displaying an image and a non-display state displaying no image, and a timing means. The timing means measures a non-display time which is an amount of time that the switching means allows the non-display time to continue, after the timing means has measured a certain non-display time, the voltage applying means applies a second voltage lower than first voltage to be applied in the display state to the anode electrode, while emits electrons from the electron-emitting device. COPYRIGHT: (C)2010,JPO&INPIT