JP2016062747A - X-ray apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a high voltage generation part of an X-ray apparatus.SOLUTION: An X-ray apparatus comprises: an X-ray tube device 120 which has an X-ray tube 130 for generating an X-ray to be radiated to a subject; a high voltage generation part 240 which generates DC high voltage to be applied to the X-ray tube 130; an X-ray detection unit 124 which detects the X-ray penetrating the subject to convert it into an electric signal; and an operation part 40 which performs an operation of radiography and displays an X-ray image generated on the basis of the electric signal from the X-ray detection unit 124. The high voltage generation part 240 includes a transformer for voltage boosting for boosting AC voltage, a capacitor and a rectifier. The transformer for voltage boosting has a primary side coil and a secondary coil wound around an iron core. The capacitor includes an electrode which is arranged in a state of being laminated on the secondary coil of the transformer for voltage boosting, and a dielectric substance which is arranged in a state of being laminated on the secondary coil.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an X-ray apparatus that obtains an X-ray image by irradiating X-rays.

  The X-ray apparatus includes a high voltage generator, an X-ray tube apparatus that generates X-rays based on the supply of a high voltage from the high voltage generator, and an X-ray detector. The X-ray apparatus irradiates an X-ray generated by the X-ray tube apparatus to a subject to be imaged, detects X-rays transmitted through the subject by the X-ray detection device, and the imaging object An X-ray image of the part is generated. The X-ray tube device includes an X-ray tube including a cathode that generates an electron beam and an anode that generates an X-ray when the electron beam collides with the X-ray tube. A high voltage is applied to the cathode and the anode, the electron beam generated at the cathode is accelerated by the high voltage to increase the kinetic energy of the electron beam, and the electron beam having a high kinetic energy collides with the anode. . By making an electron beam with increased kinetic energy collide with the anode, the X-ray dose generated by the anode can be increased.

  An example of a high voltage generator that generates a high voltage to be applied to the X-ray tube is described in Patent Document 1.

JP 2011-198527 A

  The high voltage generator includes a plurality of capacitors for boosting the voltage and has a relatively large structure. There is a demand to reduce the space for housing the high voltage generator, but it cannot be made small enough to meet the demand. In order to reduce the storage space, it is important to downsize the high voltage generator itself.

  In particular, in an X-ray computed tomography apparatus (hereinafter referred to as an X-ray CT apparatus) which is one of X-ray apparatuses, the high-voltage generator and the X-ray apparatus are used to generate a stereoscopic image of a region to be imaged by a subject. A tube apparatus, an X-ray detection apparatus, or the like is fixed to a rotating frame and rotates around the subject, and X-ray images are taken from different angles to obtain image information. Based on the acquired image information from different angles, a three-dimensional image of the subject to be imaged is generated.

  As described above, the X-ray CT apparatus has a structure in which a rotating frame for performing X-ray imaging while changing the angle of the region to be imaged is provided, and the high voltage generator is provided in the rotating frame. Since the rotating frame rotates around the outer periphery of the imaging target region, it is desirable that the rotating frame can be reduced in size. As described above, the high voltage generator must be disposed on the rotating frame together with the X-ray tube. If the high voltage generator can be miniaturized, there are various advantages.

  The objective of this invention is providing the X-ray apparatus provided with the high voltage generator which can be reduced in size.

  An X-ray apparatus that solves the above problems includes an X-ray tube apparatus having an X-ray tube that generates X-rays for irradiating a subject, and a high voltage that generates a high DC voltage applied to the X-ray tube. A generator, an X-ray detection unit that detects X-rays transmitted through the subject and converts them into an electrical signal, and an X-ray imaging operation and is generated based on the electrical signal from the X-ray detection unit An operation unit for displaying an X-ray image, and the high voltage generation unit includes a boosting transformer for boosting an AC voltage, a capacitor, and a rectifier, and the boosting transformer is disposed in an iron core. A winding having a primary winding and a secondary winding, wherein the capacitor includes an electrode disposed in a laminated state with the secondary winding of the step-up transformer, and the secondary winding and the laminated state And a dielectric disposed on the substrate.

  According to the present invention, it is possible to obtain an X-ray apparatus including a high voltage generator that can be miniaturized.

1 is an external view showing an external appearance of an X-ray CT apparatus that is an embodiment to which the present invention is applied. It is a block diagram which shows the structure of the X-ray CT apparatus which is one Example to which this invention was applied. It is explanatory drawing explaining the arrangement | positioning state of each apparatus provided in the rotation frame of the X-ray CT apparatus. It is a block diagram explaining an example of the high voltage supply circuit for supplying DC high voltage to an X-ray tube. It is a circuit diagram which shows an example of the circuit of a high voltage generation part. It is explanatory drawing explaining the structure of a high voltage generation part. It is explanatory drawing explaining the Example which formed the capacitor | condenser in the outer peripheral side of the secondary winding of a step-up transformer. It is explanatory drawing explaining the Example which formed the resonant capacitor in the outer peripheral side of the secondary winding of a step-up transformer. It is explanatory drawing explaining the Example which formed the capacitor | condenser inside the secondary winding of the step-up transformer. It is explanatory drawing explaining the Example which formed the resonant capacitor inside the secondary winding of the step-up transformer. It is explanatory drawing explaining the Example which formed the several capacitor | condenser in the outer peripheral side of the secondary winding of a step-up transformer. It is explanatory drawing explaining the Example which formed the several capacitor | condenser inside the secondary winding of the step-up transformer. It is a circuit diagram which shows another example of the circuit of a high voltage generation part. It is explanatory drawing explaining the Example which formed the smoothing capacitor in the outer peripheral side of the secondary winding of a step-up transformer. It is explanatory drawing explaining the Example which formed the smoothing capacitor inside the secondary winding of the step-up transformer. It is explanatory drawing explaining the Example which formed the capacitor | condenser divided | segmented into the axial direction. It is explanatory drawing explaining an example of the capacitor | condenser sheet | seat for forming the wound capacitor | condenser. It is explanatory drawing explaining another example of the capacitor | condenser sheet for forming the wound capacitor | condenser.

1. [PREFERRED EMBODIMENT OF THE INVENTION] The form (Hereinafter, it is described as an Example) for implementing this invention is demonstrated using drawing below. In the embodiment, the same reference numerals are given to substantially the same configurations. Structures with the same reference sign have substantially the same action, and have substantially the same effect. The description of the same reference numerals may not be repeated. The problems to be solved by the following embodiments and the effects exerted will be described in the description of the embodiments. However, the embodiments described below are not limited to the problems described in the column “Problems to be solved by the invention” above, Other problems can be solved. In addition, the embodiment described below can exhibit not only the effects described in the column of “Effects of the Invention” but also other effects.

  The present invention can be applied to an X-ray apparatus that irradiates a subject with X-rays and generates an X-ray image of the subject. A typical example of the X-ray apparatus will be described below.

2. Description of Overall Configuration of X-ray CT Apparatus 10 and X-ray Imaging Operation (1) Description of Overall Configuration of X-ray CT Apparatus 10 FIG. 1 is an external view of an X-ray CT apparatus 10 according to an embodiment to which the present invention is applied. FIG. 2 is a block diagram for explaining the overall configuration of the X-ray CT apparatus 10. The X-ray CT apparatus 10 includes an imaging unit 30 and an operation unit 40, and the imaging unit 30 is provided in an imaging room formed by a partition wall 20 that blocks X-rays. It is provided outside.

  The imaging unit 30 performs X-ray imaging while changing the imaging angle of the subject's imaging target region, and obtains a large number of X-ray image information with the angle changed and a bed 104 on which the subject is placed. And have. In addition, the scanner 100 is provided with an opening 112 for placing the subject placed on the bed 104 therein.

  The operation unit 40 includes an input / output device 190 for imaging operation or information input / output provided on the console 180, and a system control device 184 for controlling the entire X-ray CT apparatus 10 (see FIG. 2). ), An image processing device 186 (see FIG. 2) for generating a stereoscopic image from the detected X-ray image information, and a storage device 188 (FIG. 2) for storing the detected or generated image and necessary information. For example). Note that some of these configurations are omitted in the description of FIG. The operator performs an operation for imaging from the operation unit 40 according to the imaging schedule, so that the X-ray imaging of the imaging target region of the subject is performed by the scanner 100. X-ray image information obtained by X-ray imaging is sent from the scanner 100 to the image processing device 186 of the operation unit 40. In the image processing device 186, a stereoscopic image of the part to be imaged is generated from the X-ray image information obtained in accordance with an instruction from the system control device 184, and the generated stereoscopic image is output from the input / output device 190 in accordance with an instruction from the operator. Displayed on the device or stored in the storage device 188.

(2) Description of Imaging Operation of X-Ray CT Apparatus 10 In FIG. 2, a rotating frame 110 that rotates according to an imaging schedule is provided inside the scanner 100, and the rotating frame 110 has an opening 112. A subject placed on the bed 104 is inserted and placed inside 112. However, the description of the subject is omitted in FIG. A command is sent from the system control device 184 to the bed control device 172 based on the imaging schedule, and the bed control device 172 controls the height of the bed 104 on which the subject is placed and the movement of the subject in the body axis direction. The

  An X-ray tube device 120 having an X-ray tube 130 (see FIG. 5) for generating X-rays and an X-ray beam having a predetermined divergence angle from the generated X-rays are formed on the rotating frame 110. A collimator 122 that irradiates the examiner, or an X-ray detection unit that detects an X-ray beam transmitted through the subject and outputs an electrical signal corresponding to the intensity of the X-ray beam transmitted through the subject as X-ray image information 124, a data collection device 126 that transmits X-ray image information detected by the X-ray detection unit 124 to the image processing device 186, and the like.

  The gantry control device 174 controls the rotation of the rotating frame 110 according to a command from the system control device 184, and the angle of the X-ray beam irradiated to the subject from the collimator 122 changes according to the imaging schedule. A large number of pieces of X-ray image information whose imaging angles are sequentially changed according to the rotation of the rotating frame 110 are output from the X-ray detection unit 124, and the large number of pieces of X-ray image information are taken into the image processing device 186 via the data acquisition device 126. . Based on these pieces of X-ray image information, an image processing device 186 generates an X-ray stereoscopic image of the subject's imaging target region.

(3) Description of Rotating Frame 110 of Scanner 100 FIG. 3 is an explanatory diagram for explaining an example of the arrangement state of each device provided on the rotating frame 110 on a plane perpendicular to the body axis of the subject. It should be noted that the specific arrangement of each device is preferably in an optimal state in accordance with the function of each scanner 100, and FIG. 3 shows an example only. As will be described below, the high voltage generator 240, which is a particularly important configuration for the present invention, is provided in the rotating frame 110 and rotates according to the rotation of the rotating frame 110. Therefore, the high voltage generator 240 operates in an electrically and mechanically harsh environment.

  In FIG. 3, the rotating frame 110 is rotatably supported by the pointing device 84 and the pointing device 85 respectively provided on the stand 82 and the stand 83 arranged on the left and right. The rotating frame 110 is rotated according to an instruction from the gantry control device 174 by a rotation driving mechanism (not shown). An X-ray tube device 120 having an X-ray tube 130 (see FIG. 4) and a collimator 122 are arranged on one side of the opening 112 for the subject to be placed on the bed 104, and on the other side of the opening 112. An X-ray detection unit 124 is arranged. Further, the high voltage generator 240 that supplies a DC high voltage to the X-ray tube of the X-ray tube device 120, the inverter 230 that supplies an AC voltage of a predetermined frequency to the high voltage generator 240, and the X-ray tube device 120 are cooled. The rotating frame 110 is provided with a cooling device 176 for controlling the device and a control unit 171 for controlling the device provided on the rotating frame 110. Note that the control unit 171 also operates as part of the X-ray control device 170. When the rotating frame 110 is rotated by a rotation driving mechanism (not shown), centrifugal force is generated in each device provided in the rotating frame 110 including the inverter 230 and the high voltage generator 240. It is desirable that these devices including the inverter 230 and the high voltage generator 240 can sufficiently cope with the centrifugal force. The configuration of the high voltage generator 240 described below has a great effect not only in improving the response to save space and improving the response to high voltage, but also in the response to centrifugal force and the like.

3. Description of High Voltage Generating Unit 240 (1) Description of High Voltage Supply Circuit to X-ray Tube FIG. 4 illustrates a high voltage supply circuit that supplies a DC high voltage to the X-ray tube 130 of the X-ray tube device 120. FIG. The commercial voltage supplied from the commercial power supply 222 is converted into a DC voltage boosted by the converter 224, and the converted DC voltage is supplied to the inverter 230. Inverter 230 converts the voltage to an AC voltage having a predetermined frequency based on the supplied DC voltage.

  The high voltage generator 240 includes a high voltage transformer 250 that generates a boosted high voltage AC voltage and a high voltage rectifier 300 that generates a DC high voltage based on the boosted high voltage AC voltage. The high voltage transformer 250 has a boosting transformer. When an AC voltage having a predetermined frequency is supplied from the inverter 230 to the high voltage transformer 250, a high voltage AC voltage is generated by the boosting transformer. Output. The high voltage rectification unit 300 includes, for example, a Cockcroft-Walton circuit, and the supplied high-voltage AC voltage is further boosted by the high-voltage rectification unit 300 and converted into a DC voltage. It is supplied to the cathode 132 and the anode 134. The value of the DC voltage supplied to the X-ray tube 130 varies depending on the specifications of the X-ray tube 130, but is, for example, tens of thousands to hundreds of thousands of volts. This DC voltage accelerates the electron beam irradiated from the cathode 132 of the X-ray tube 130 to the anode 134, and the anode 134 generates X-rays based on the energy of the accelerated electron beam.

  The high voltage supply circuit shown in FIG. 4 is an example of a high voltage supply circuit to which the present invention is applied, and is not limited to this configuration. The high voltage transformer 250 has a step-up transformer, and the high voltage transformer 250 or the high voltage rectifier 300 has a capacitor. By using the configuration of the embodiment described below for the step-up transformer and capacitor as described below, for example, more space can be saved and mounting on the rotating frame 110 is further improved. In addition, it is possible to cope with high voltage in a smaller space. In other words, the structure is excellent in breakdown voltage. Moreover, even if it attaches to the rotating frame 110 which rotates, there exists an effect which is easy to respond | correspond by mechanical stress, such as a centrifugal force.

(2) Description of an Example of the High Voltage Generator 240 FIG. 5 shows an example of a specific circuit of the high voltage transformer 250 and the high voltage rectifier 300 included in the high voltage generator 240. As described above, the application of the present invention is not limited to this circuit configuration. An AC voltage having a predetermined frequency is output from the inverter 230 and supplied to the high voltage transformer 250. Although the circuit configuration of the high voltage transformer 250 is not particularly specified, for example, in this embodiment, two step-up transformers 260 and 270 connected in parallel are provided. The step-up transformers 260 and 270 are respectively provided with primary windings 262 and 272 and secondary windings 264 and 274, and the secondary windings 264 and 274 are provided with resonant capacitors 282 and 284, respectively.

  An AC voltage having a predetermined frequency is supplied to the primary side windings 262 and 272 of the step-up transformers 260 and 270, and boosted by the step-up transformers 260 and 270, respectively, and boosted to the respective secondary windings 264 and 274. Output voltage. The high voltages output from the secondary windings 264 and 274 of the step-up transformers 260 and 270 are rectified by the high voltage rectifier 300, respectively, and the high DC voltage is applied between the cathode 132 and the anode 134 of the X-ray tube 130. Supplied in between.

  In this embodiment, the resonant capacitor 282 and the resonant capacitor 284 are provided in the secondary winding 264 and the secondary winding 274 of the boosting transformer 260 and the boosting transformer 270, but the primary winding 262 and the primary side It may be provided on the winding 262 side. The resonant capacitor 282 and the resonant capacitor 284 have a resonant frequency close to the frequency of the AC voltage supplied to the boosting transformer 260 and the boosting transformer 270 together with the boosting transformer 260 and the boosting transformer 270, thereby boosting the voltage. The output of the transformer 260 and the step-up transformer 270 can be increased.

  The high voltage rectifier 300 has two sets of Cockcroft-Walton circuits connected in parallel. The first Cockcroft-Walton circuit includes a capacitor 332, a capacitor 334, a capacitor 336, a capacitor 338, a rectifier 302, a rectifier 304, a rectifier 306, and a rectifier 308. The capacitors and rectifiers are connected at connection point 352, connection point 354, connection point 356, and connection point 358, respectively.

  The second Cockcroft-Walton circuit includes a capacitor 342, a capacitor 344, a capacitor 336, a capacitor 338, a rectifier 312, a rectifier 314, a rectifier 316, and a rectifier 318. The capacitors and rectifiers are connected at connection point 362, connection point 364, connection point 356, and connection point 358, respectively. The capacitor 336, the capacitor 338, the connection point 356, and the connection point 358 are used in both the first cockcroft Walton circuit and the second cockcroft Walton circuit.

  When an AC voltage having a predetermined frequency is supplied from the inverter 230 to the step-up transformer 260 and the step-up transformer 270, the secondary winding 264 of the step-up transformer 260 and the secondary winding 274 of the step-up transformer 270 are supplied. AC voltages in the directions indicated by the V1 arrow 266 and the V2 arrow 276 are generated, respectively, using the connection point 292 as a common reference point. The AC voltage indicated by the V1 arrow 266 is boosted and rectified by the first Cockcroft-Walton circuit to generate a negative DC high voltage at the connection point 358 and is supplied to the cathode 132 of the X-ray tube 130. The AC voltage indicated by the V2 arrow 276 is boosted and rectified by the second Cockcroft-Walton circuit, and a negative DC high voltage is generated at the common connection point 358 and supplied to the cathode 132 of the X-ray tube 130. The anode 134 of the X-ray tube 130 is electrically connected to a connection point 292 that is a common reference point.

4). 6. Description of Example of Arrangement of Internal Devices in High Voltage Generation Unit 240 FIG. 6 is an explanatory diagram for explaining an example of the arrangement state of internal devices in the high voltage generation unit 240. As shown in FIG. 3, the high voltage generator 240 is mounted on the rotating frame 110 and rotates with the rotation of the rotating frame 110. The high voltage generator 240 is housed in a housing 242, and the boosting transformer 260, the boosting transformer 270, the high voltage rectifier 300, and the heating transformer 140 are fixed to a frame 244 in the housing 242. . The housing 242 is filled with insulating oil 246 and sealed.

  The step-up transformer 260 and the step-up transformer 270 are provided with a common iron core 256, and the step-up transformer 260 and the step-up transformer 270 are attached to the frame 244 by fixing the iron core 256 to the frame 244 by the mounting bracket 252. It is fixed to 244. The iron core 256 is provided with a cylindrical, square, or polygonal winding frame, and the primary winding 262 and the primary winding 262 are respectively wound around the winding transformer 260 and the boosting transformer 270 on the winding frame. It has been turned. An insulator is provided on the outer periphery of the primary side winding 262 and the primary side winding 262, and the secondary winding 264 and the secondary winding 274 of the step-up transformer 260 and the step-up transformer 270 are wound around the outer periphery of the insulator. It has been turned.

  In this embodiment, insulators are further provided on the outer circumferences of the secondary winding 264 and the secondary winding 274, and capacitors are formed on the outer circumferences of the respective insulators. In this embodiment, the capacitor is the first stage capacitor 332 or 342 of the Cockcroft-Walton circuit, but is not limited thereto. Resonant capacitors 282 and 284 may be formed in place of the capacitors 332 and 342. Further, a multilayer capacitor is formed in a multilayer structure, a capacitor 332 is formed outside the resonant capacitor 282, and a capacitor is formed outside the resonant capacitor 284. 342 may be formed. Alternatively, the outer and inner capacitors may be formed in reverse. These specific structures will be described below. In addition to the first stage of the Cockcroft-Walton circuit, other capacitors may be formed in a laminated structure. In FIG. 6, for the sake of simplicity, the output of the capacitors formed on the outer periphery of the step-up transformer 260 and the step-up transformer 270 is supplied to the high-voltage rectification unit 300. A part of the capacitor constituting part 300 may be arranged on the outer periphery of boosting transformer 260 or boosting transformer 270. Further, a part of the capacitor constituting the high voltage rectifying unit 300 is arranged on the outer periphery of the step-up transformer 260 and the step-up transformer 270, so that part of the rectifier constituting the high-voltage rectifying unit 300 is part of the step-up transformer. It may be provided at the end of the transformer 260 or the step-up transformer 270.

  The outputs of the step-up transformer 260 and the step-up transformer 270 are supplied to the high voltage rectification unit 300, and a high DC voltage is generated by the high voltage rectification unit 300, and the high voltage connection mechanism 360 supplies the output to the cathode 132 of the X-ray tube 130. Supplied. A heating transformer 140 is provided in the housing 242 and supplies a current for heating the cathode 132 of the X-ray tube 130 to the X-ray tube 130.

5. Description of Capacitor Forming Multilayer Structure with Windings of Step-Up Transformers 260 and 270 (1) Description of Configuration of Capacitor 332 Used in Cockcroft-Walton Circuit FIG. 3 is an explanatory diagram illustrating a structure in which a capacitor 332 used in a Cockcroft-Walton circuit constituting 300 is formed, and is a cross-sectional view of a structure in which a capacitor 332 is formed on the outer periphery of a step-up transformer 260. FIG. FIG. 8 is an explanatory diagram for explaining a structure in which a resonant capacitor 282 is formed on the outer periphery of the boosting transformer 260, and is a cross-sectional view of a structure in which the resonant capacitor 282 is formed on the outer periphery of the boosting transformer 260. The structure in which the capacitor 342 used in the Cockcroft-Walton circuit constituting the high-voltage rectifying unit 300 is formed on the outer periphery of the step-up transformer 270 is substantially the same as that described with reference to FIG. 7, and is representatively described with reference to FIG. To do. Further, the structure in which the resonant capacitor 284 is formed on the outer periphery of the step-up transformer 270 is almost the same as the contents described with reference to FIG. 8, and will be described with reference to FIG.

  In FIG. 7, a winding frame 412 having a cylindrical shape, for example, a cylindrical shape, a quadrangular shape, or a polygonal shape is provided on the outer periphery of the iron core 256 of the step-up transformer 260, and the primary side winding 262 is wound around the winding frame 412. Yes. A winding frame 422 having an insulating function is provided so as to cover the outer periphery of the primary winding 262, and the secondary winding 264 is wound around the winding frame 422. The primary winding 262 and the secondary winding 264 are wound around the iron core 256, thereby operating as a transformer. By making the number of turns of the secondary winding 264 greater than that of the primary winding 262, a boosted AC voltage is output from the secondary winding 264. The primary winding 262 and the secondary winding 264 are insulated by a winding frame 422. An insulator 432 is provided on the outer periphery of the secondary winding 264, and a capacitor 332 is formed on the outer periphery of the insulator 432.

  The capacitor 332 may simply have a structure in which the dielectric 444 is sandwiched between the two electrodes 442 and 446. However, in order to increase the capacity of the capacitor 332, the area of the opposing electrodes is increased with the dielectric 444 interposed therebetween. Is desirable. A capacitor may be formed by winding a multilayer capacitor sheet having a structure in which an insulating material is further added to a sheet of a three-layer structure in which a dielectric 444, for example, a film is sandwiched between two thin metals. In the configuration in which the multilayer capacitor sheet is wound a plurality of times, the effective area of the electrodes facing each other across the dielectric 444 can be increased as the number of turns increases, and by appropriately selecting the number of turns, a desired capacity can be obtained. A capacitor 332 can be made. This can be applied to all the other embodiments described below, and the required capacity can be obtained even if the axial length of the winding is shortened.

  In the structure in which the dielectric 444 is sandwiched between the two electrodes 442 and 446 as described above and the number of windings is one or several times and the number of windings is small, the thickness of the dielectric 444 is increased. The withstand voltage between the electrode 442 and the electrode 446 can be increased. Therefore, a capacitor having a high voltage between terminals can be formed. The same applies to other embodiments described below.

  On the other hand, when the number of windings is increased, the facing area between the electrode 442 and the electrode 446 can be increased, and the capacity can be increased. By adjusting the number of windings when obtaining a predetermined capacity, the length in the direction of the central axis 254 in FIG. 7 can be shortened. The length of the primary winding 262 and the secondary winding 264 in the direction of the central axis 254 and the length of the capacitor 332 in the direction of the central axis 254 can be matched. It becomes easy to form another capacitor, for example, the resonant capacitor 282. In addition, it is easy to form a plurality of capacitors in the direction of the central axis 254 by providing slits in the direction of the central axis 254 described below. The same applies to the other embodiments.

  As the electrode 442 and the electrode 446, vapor deposition metal such as Al (aluminum), Zn (zinc), Cu (copper), or a sheet electrode can be used. As the dielectric 444, a plastic film such as PP (polypropylene), PTFE (fluororesin), PET (polyethylene terephthalate), or a sheet-like insulator such as insulating paper is suitable. Or you may comprise with a cylindrical ceramic. In order to increase the withstand voltage between the electrode 442 and the electrode 446, a structure in which a plurality of layers of the dielectric 444 are provided between the electrode 442 and the electrode 446 may be employed. Connection of lead wires 448 and 449 between the step-up transformer 260 and the capacitor 332, for example, the connection point 294 and the connection point 352 are constituted by brazing such as soldering, welding, thermal spraying (metallicon), conductive paste, or the like. be able to. The materials and configurations of the electrodes, dielectrics, and connection points described above are the same in the other embodiments, and the description in the other embodiments is omitted.

  In the step-up transformer 260 and the step-up transformer 270, the capacitor 332 and the capacitor 342 connected to the secondary winding 264 and the secondary winding 274 are placed outside the secondary winding 264 and the secondary winding 274. By arranging in a stacked structure, the step-up transformer and the capacitor used in the Cockcroft-Walton circuit can be made in a compact structure, and the high voltage generator 240 as a whole becomes compact. Furthermore, the step-up transformer and the capacitor used in the Cockcroft-Walton circuit have a very strong structure against centrifugal force, and the high voltage generator 240 is attached to the rotating frame 110, so that the high voltage generator 240 rotates. However, it can sufficiently withstand centrifugal force, and reliability is improved. Naturally, it becomes easy to connect the step-up transformer 260 and the step-up transformer 270 to the respective capacitors, but the connection structure also has a structure that can sufficiently withstand centrifugal force. Reliability is improved.

(2) Description of Configuration of Resonant Capacitor 282 FIG. 8 shows an embodiment in which a resonant capacitor 282 is formed on the outer periphery of the step-up transformer 260 instead of the capacitor 332 shown in FIG. The technical contents described in FIG. 7 are the same in FIG. 8, and the configurations having the same reference numerals have the same functions and the same effects. The description of the same reference numerals will not be repeated. An insulator 432 is provided on the outer periphery of the step-up transformer 260 as in FIG. 7, and a resonant capacitor 282 is formed outside the insulator 432 instead of the capacitor 332. Although the action of the resonant capacitor 282 is different from that of the capacitor 332, the structure of the resonant capacitor 282 is the same as the structure of the capacitor 332 described with reference to FIG. 7, and a dielectric 454 is provided between the electrode 452 and the electrode 456. Yes. The electrode 452 and the electrode 456 can be formed using the same material as the electrode 442 and the electrode 446 described with reference to FIG. The dielectric 454 can be formed using the same material as the dielectric 444 described with reference to FIG.

  The resonant capacitor 282 is intended to resonate with the leakage inductance (not shown) of the step-up transformer 260, thereby increasing the supply current to the step-up transformer 260 and increasing the output current of the step-up transformer 260. To act. As described with reference to FIG. 5, the resonant capacitor 282 is connected in parallel to the output terminal of the secondary winding 264 of the step-up transformer 260. Therefore, the electrode 452 which is one electrode of the resonance capacitor 282 is connected to one end of the secondary winding 264 by the lead wire 462, and the electrode 456 which is the other electrode of the resonance capacitor 282 is connected to the other end of the secondary winding 264 and the lead wire. 464 is connected. In order to secure a withstand voltage between the electrode 452 and the electrode 456, for example, in this embodiment, the dielectric 454 is configured by winding a film having dielectric characteristics a plurality of times. By laminating a predetermined number of films having dielectric characteristics, the required withstand voltage can be ensured, and the predetermined number of laminations can be controlled by the number of windings of the film, so the configuration of FIG. 8 is excellent in productivity. Yes.

  The capacitor 332 in FIG. 7 can of course have the same configuration. As described with reference to FIG. 7, the resonant capacitor 282 shown in FIG. 8 also has a multilayer capacitor sheet having a structure in which a three-layer structure in which a dielectric 454 such as a film is sandwiched between two thin metals is further sandwiched between insulating materials. You may form a capacitor | condenser by winding. By adopting such a structure, a desired facing area between the two metals facing each other can be secured without being limited by the length in the direction of the central axis 254, and a necessary capacity can be obtained. .

  Further, the relationship between the step-up transformer 260 and the capacitor 332 or the relationship between the step-up transformer 260 and the resonance capacitor 282 has been described. However, the relationship between the step-up transformer 270 and the capacitor 342, or the step-up transformer 270 and The relationship with the resonant capacitor 284 is the same. Therefore, description of the step-up transformer 270 is omitted.

  In the step-up transformer 260 and the step-up transformer 270, the resonant capacitor 282 and the resonant capacitor 284 connected in parallel with the secondary winding 264 and the secondary winding 274 are connected to the secondary winding 264 and the secondary winding 274. By arranging them in a laminated structure on the outside, the step-up transformer and the resonant capacitor can be made in a compact structure, and the entire high voltage generator 240 becomes compact. Furthermore, the step-up transformer and the resonant capacitor have a very strong structure against centrifugal force, and the high voltage generator 240 is attached to the rotating frame 110, so that the centrifugal force is sufficient even if the high voltage generator 240 rotates. Can withstand and improve reliability. In addition, it is natural that the step-up transformer 260 and the step-up transformer 270 can be easily connected to the respective capacitors, but the connection structure also has a structure that can sufficiently withstand centrifugal force. Even reliability improves.

6). Description of Other Examples of Capacitors Forming Multilayer Structure with Windings of Step-Up Transformers 260 and 270 (1) Description of Configuration of Capacitor 332 Used in Cockcroft-Walton Circuit Capacitor 332 described in FIG. It is arranged outside the secondary winding 264 of the transformer for use 260. However, the arrangement of the capacitor 332 and the connection point 364 may be interchanged. This structure will be described with reference to FIG. Similarly to FIG. 7, a capacitor 342 can be provided outside the secondary winding 274 of the step-up transformer 270. Further, as described below, the position of the secondary winding 274 of the step-up transformer 270 The position of the capacitor 342 can be changed.

  In FIG. 9, similarly to FIG. 7, a winding frame 412 is provided on the outer periphery of the iron core 256, and the primary winding 262 is wound around the winding frame 412. In FIG. 7, a winding frame 422 having an insulating function is provided on the outer phase of the primary winding 262, and the secondary winding 264 is wound around the winding frame 422. On the other hand, in FIG. 9, an insulator 472 is provided in place of the winding frame 422 outside the primary winding 262 corresponding to the position of the winding frame 422. A capacitor 332 is disposed outside the insulator 472. The capacitor 332 includes an electrode 442, a dielectric 444, and an electrode 446 as in the structure of FIG. The structure, operation, and effect of the capacitor 332 are as described with reference to FIG.

  An insulator 432 is provided outside the capacitor 332, and a secondary winding 264 is wound around the insulator 432. One end of the secondary winding 264 is connected to an electrode 442 which is one electrode of the capacitor 332 by a lead wire 448, and the electrode 446 which is the other electrode of the capacitor 332 is connected to a connection point 352 shown in FIG. Connected to.

  In the step-up transformer 260 and the step-up transformer 270, the capacitor 332 and the capacitor 342 connected to the secondary winding 264 and the secondary winding 274 are placed outside the primary side winding 262 and the primary side winding 262. By arranging in a stacked structure, the step-up transformer and the capacitor used in the Cockcroft-Walton circuit can be made in a compact structure, and the high voltage generator 240 as a whole becomes compact. Furthermore, the step-up transformer and the capacitor used in the Cockcroft-Walton circuit have a very strong structure against centrifugal force, and the high voltage generator 240 is attached to the rotating frame 110, so that the high voltage generator 240 rotates. However, it can sufficiently withstand centrifugal force, and reliability is improved. In addition, it is natural that the step-up transformer 260 and the step-up transformer 270 can be easily connected to the respective capacitors, but the connection structure also has a structure that can sufficiently withstand centrifugal force. Even reliability improves.

(2) Description of Configuration of Resonant Capacitor 282 FIG. 9 shows a structure in which a capacitor 332 is disposed outside the primary winding 262 of the step-up transformer 260 and a secondary winding 264 is disposed outside the capacitor 332. . A resonant capacitor 282 may be provided instead of the capacitor 332. FIG. 10 shows a structure in which a resonant capacitor 282 is disposed outside the primary side winding 262 of the step-up transformer 260 and a secondary winding 264 is disposed further outside the resonant capacitor 282. In FIG. 10, the same reference numerals as those in the other drawings have the same effects and the same effects. Since the configuration with the same reference numerals in FIG. 10 as those in the other drawings has already been described in other drawings, the description thereof will be omitted. Further, the operation and specific structure of the resonant capacitor 282 are as described in FIG.

  As described above, the winding frame 412 having an insulating action is provided on the outer periphery of the iron core 256, and the primary side winding 262 is wound around the winding frame 412. An insulator 472 is provided outside the primary winding 262, and a resonant capacitor 282 including an electrode 456, a dielectric 454, and an electrode 452 is provided outside the insulator 472. An insulator 432 is provided on the outer periphery of the resonant capacitor 282, and the secondary winding 264 is wound around the outside of the insulator 432. The operation of the resonant capacitor 282 is as described above, and is connected in parallel with the secondary winding 264 by the lead wire 462 and the lead wire 464. Furthermore, a lead wire 476 for connecting to the capacitor 332 is connected to the electrode 456 which is the other electrode of the resonance capacitor 282.

  FIG. 10 illustrates the step-up transformer 260 as an example, but the structures of the step-up transformer 270 and the resonant capacitor 284 are the same as those in FIG. 10, and the description of the step-up transformer 270 is omitted. In the step-up transformer 260 and the step-up transformer 270, the resonant capacitor 282 and the resonant capacitor 284 connected in parallel with the secondary winding 264 and the secondary winding 274 are connected to the primary side winding 262 and the primary side winding 262, respectively. By arranging them in a laminated structure on the outside, the step-up transformer and the resonant capacitor can be made in a compact structure, and the entire high voltage generator 240 becomes compact. Furthermore, the step-up transformer and the resonant capacitor have a very strong structure against centrifugal force, and the high voltage generator 240 is attached to the rotating frame 110, so that the centrifugal force is sufficient even if the high voltage generator 240 rotates. Can withstand and improve reliability. In addition, it is natural that the step-up transformer 260 and the step-up transformer 270 can be easily connected to the respective capacitors, but the connection structure also has a structure that can sufficiently withstand centrifugal force. Even reliability improves.

7). Description of Embodiments of Multiple Capacitors Forming Multilayer Structure with Windings of Step-Up Transformers 260 and 270 (1) A plurality of capacitors are wound and laminated on the outside of the secondary winding of step-up transformer 260 or 270 FIG. 11 is a cross-sectional view of an embodiment in which a plurality of capacitors used in the Cockcroft-Walton circuit are formed so as to form a laminated structure with the windings of the step-up transformer. It is explanatory drawing of the Example which forms the capacitor | condenser 332 and the capacitor | condenser 334 in the outer side of the secondary winding 264 of the transformer 260 for a motor. When the capacitors 342 and 344 are formed outside the secondary winding 274 of the step-up transformer 270, the structure is substantially the same, and further, the secondary winding 264 of the step-up transformer 260 or the two of the step-up transformer 270 are formed. The same applies when the capacitor 336 and the capacitor 338 are provided outside the next winding 274. A structure of an embodiment in which a capacitor 332 and a capacitor 334 are provided outside the secondary winding 264 of the step-up transformer 260 will be described with reference to FIG.

  As described above, the primary winding 262 is wound around a winding frame 412 having an insulating function provided outside the iron core 256. Further, a winding frame 422 having an insulating function is provided outside the primary side winding 262, the secondary winding 264 is wound around the winding frame 422, and the primary side winding 262 and the secondary winding 264 are wound around the iron core 256. As a result, the boosted AC voltage is output from the secondary winding 264. This configuration, operation, and effect are as described above.

  An insulator 432 is disposed outside the secondary winding 264 so as to cover the secondary winding 264, and a capacitor 332 and a capacitor 334 are disposed outside the insulator 432. The capacitor 332 and the capacitor 334 are the same as the capacitor 332 already described with reference to FIG. 7, and in FIG. 11, two capacitors having the same structure as the capacitor 332 described with reference to FIG. 7 are arranged in series. When the high-voltage rectifying unit 300 such as a Cockcroft-Walton circuit has a larger number of capacitors connected in series, the same structure as the capacitor 332 and the capacitor 334 in FIG. Can be formed.

  In FIG. 11, the capacitor 332 includes one electrode 446 connected to one end of the secondary winding 264 by a lead wire 448, the other electrode 442, and a dielectric 444 sandwiched therebetween. The electrode 442 not only functions as the other electrode of the capacitor 332 but also functions as one electrode of the capacitor 334. The capacitor 334 includes the common electrode 442 as one electrode, the electrode 482 as the other electrode, and a dielectric 484 between the electrode 442 and the electrode 482.

  A lead wire 488 is connected to an electrode 442 common to the capacitor 332 and the capacitor 334, and the electrode 442 is connected to the rectifier 302 and the rectifier 304 shown in FIG. 5 or 6 via the lead wire 488. The other electrode 482 of the capacitor 334 is connected to the rectifier 306 or the rectifier 308 via the lead wire 486.

  As shown in FIG. 11, by forming a plurality of capacitors such as a capacitor 332 and a capacitor 334 so as to form a laminated state with the primary winding 262 and the secondary winding 264, the high voltage generator 240 can be made more compact. It is very suitable for fixing to the rotating frame 110. Further, by forming a plurality of capacitors such as a capacitor 332 and a capacitor 334 so as to form a laminated state with the primary winding 262 and the secondary winding 264, a structure that is extremely resistant to centrifugal force is formed and fixed to the rotating frame 110. Very suitable for doing. Capacitor 332 and capacitor 334 arranged with a structure sharing electrode 442 can be formed at a position farther from secondary winding 264 as the potential difference from secondary winding 264 is larger, and the dielectric strength is maintained. It has an excellent structure. These effects are the same when a plurality of capacitors are formed so as to form a laminated state in the winding of the step-up transformer 270.

(2) Description of the embodiment in which a plurality of capacitors are arranged in a laminated structure inside the secondary winding of the step-up transformer 260 or 270 A plurality of capacitors are laminated in the winding of the step-up transformer 260 or 270 In the embodiment shown in FIG. 11, a plurality of capacitors are formed outside the secondary winding of the step-up transformer 260 or 270. However, the application of the present invention is not limited to this, and a plurality of capacitors may be arranged inside the secondary windings 264 and 274 of the step-up transformer 260 or 270. FIG. 12 shows an embodiment in which a plurality of capacitors are arranged inside the secondary windings 264 and 274 of the step-up transformer 260 or 270. However, the structure of the step-up transformer 260 and the structure of the step-up transformer 270 are the same, and the structure of the step-up transformer 260 will be described as a representative.

  In FIG. 12, the winding frame 412 is arranged outside the iron core 256 as described above, and the primary winding 262 is formed by winding the winding frame 412. An insulator 472 is disposed outside the primary winding 262 so as to cover the entire outer periphery of the primary winding 262, and a capacitor 332 and a capacitor 334 that form a laminated structure with the winding are formed outside the insulator 472. Similarly to FIG. 11, the capacitor 332 is formed by the electrode 446, the electrode 442, the electrode 446 and the dielectric 444 sandwiched between the electrodes 442, and the electrode 442, the electrode 482, the electrode 442, and the electrode 482 that commonly use the capacitor 334. It is formed with a sandwiched dielectric 484. The electrode 446 is connected to the secondary winding 264 and the resonance capacitor 282 by a lead wire 492 and a lead wire 494. A common electrode 442 of the capacitor 332 and the capacitor 334 is connected to the rectifier 302 and the rectifier 304 by a lead wire 496. The electrode 482 of the capacitor 334 is connected to the rectifier 306 and the rectifier 308 by a lead wire 498. The embodiment shown in FIG. 12 is an example in which a step-up transformer 260 and a plurality of capacitors such as a capacitor 332 and a capacitor 334 are formed so as to have a laminated structure. As described above, the present invention can also be applied to a case where a plurality of capacitors are arranged in a step-up transformer 270 having a laminated structure by the same configuration as that shown in FIG.

  In the embodiment of FIG. 12, since the plurality of capacitors are formed so as to have a laminated structure with the step-up transformer, the entire high-voltage rectifying unit 300 is reduced in size, and the space required for fixing to the rotating frame 110 is reduced. Can be reduced. Further, since a plurality of capacitors are fixed to the step-up transformer so as to have a laminated structure, it is excellent in terms of strength against forces such as centrifugal force. Therefore, it can sufficiently withstand centrifugal force and inertial force generated by the rotation of the rotating frame 110, and high reliability can be obtained.

8). Description of Other Examples of High Voltage Generating Unit 240 (1) Description of Circuit of Other Examples of High Voltage Generating Unit 240 The high voltage generating unit 240 using the Cockcroft-Walton circuit has been described above. The use of the Walton circuit is not essential in the present invention, and another embodiment not using the Cockcroft-Walton circuit is shown in FIG. When an AC voltage having a predetermined frequency is supplied from the inverter 230 to the high voltage generator 240, the AC voltage is applied to the primary windings 512 and 522 of the step-up transformers 510 and 520, respectively. The step-up transformer 510 and the step-up transformer 520 step up the AC voltage, and the stepped-up AC voltage is output from the secondary winding 514 and the secondary winding 524 of the step-up transformer 510. The boosted AC voltages output from the secondary winding 514 and the secondary winding 524 are rectified by the rectifier 516 and the rectifier 526, respectively, and stored as a DC voltage in the smoothing capacitor 518 and the smoothing capacitor 528. In this embodiment, since the smoothing capacitor 518 and the smoothing capacitor 528 are connected in series, the voltage obtained by adding the terminal voltage of the smoothing capacitor 518 and the terminal voltage of the smoothing capacitor 528 has a polarity in which the cathode 132 side becomes the negative electrode and the cathode 132. Applied between the anode 134 and the anode 134.

  The circuit shown in FIG. 13 is an example, and there are various combinations of the windings of the step-up transformer 510 and the step-up transformer 520, the rectifiers 516 and 526, the smoothing capacitor 518, and the smoothing capacitor 528. The invention is not limited to a specific circuit, and can be applied to various circuits. What is important is the presence of a step-up transformer and one or more capacitors.

(2) Description of Integrated Structure of Step-Up Transformers 510 and 520 and Smoothing Capacitors 518 and 528 FIG. 14 shows a step-up transformer in which a smoothing capacitor 518 having a laminated structure is arranged with respect to the winding of the step-up transformer 510. Sectional drawing of the integral structure of 510 and the smoothing capacitor 518 is shown. A primary winding 512 is wound and fixed on a winding frame 506 provided on the outer periphery of the iron core 505, and a winding frame 513 having an insulating function is provided so as to cover the outer periphery of the primary winding 512. The secondary winding 514 is wound around a winding frame 513 and fixed. The outer periphery of the winding frame 513 is further covered with an insulator 530, and a smoothing capacitor 518 is provided outside the insulator 530.

  The smoothing capacitor 518 has the same structure as the capacitor described above, and is sandwiched between the electrode 536, the electrode 532, the electrode 536, and the electrode 532 formed in a laminated state with respect to the primary winding 512 and the secondary winding 514. And a dielectric 534 that stores electric charges. As described above, the electrode 536, the dielectric 534, and the electrode 532 are provided and fixed so as to form a laminated state with the primary winding 512 and the secondary winding 514. The structure including the step-up transformer 510, the rectifier 516, and the smoothing capacitor 518 has been described. However, the structure of the step-up transformers 520 and 526 and the smoothing capacitor 528 is exactly the same, and the description is omitted. .

  The AC voltage output from the secondary winding 514 is rectified by the rectifier 516 and accumulated in the smoothing capacitor 518. The voltage stored in the smoothing capacitor 518 and the voltage stored in the smoothing capacitor 528 shown in FIG. 13 are applied from the lead wire 554 to the cathode 132 of the X-ray tube 130 shown in FIG.

  Similar to the operation and effect described above, the components of the smoothing capacitor 518 are arranged so as to form a laminated structure with respect to the primary winding 512 and the secondary winding 514. Can be made very compact. The same applies to the step-up transformer 520 and the smoothing capacitor 528. Therefore, the space for fixing the high voltage generator 240 shown in FIG. 13 can be made very small. In the X-ray CT apparatus 10 that fixes the high voltage generating unit 240 to the rotating frame 110, the space for fixing the high voltage generating unit 240 to the rotating frame 110 can be reduced, which reduces the burden on the rotating frame 110. As described above, various effects can be obtained.

  Furthermore, since the constituent elements of the smoothing capacitor 518 are fixed to the step-up transformer 510 in a stacked state, the structure for fixing the smoothing capacitor 518 and the smoothing capacitor 528 is simplified, and the weight of the high voltage generating unit 240 can be reduced. When the high voltage generator 240 is fixed to the rotating frame 110, the centrifugal force generated with the rotation of the rotating frame 110 can be reduced. Further, since the weight of the entire rotating frame 110 is reduced, the inertial force is reduced, and the controllability of the acceleration / deceleration control of the rotating frame 110 is improved. As described above, such an effect can be similarly achieved in the above-described embodiment.

(3) Description of another embodiment of an integrated structure of step-up transformers 510 and 520 and smoothing capacitors 518 and 528 In the embodiment of FIG. 14, the smoothing capacitor 518 and the smoothing capacitor 528 are the primary winding 512 and the secondary winding. 514 is arranged outside. In the above-described embodiment, the example in which the capacitor is disposed not only outside the primary winding 512 or the secondary winding 514 but also inside the secondary winding 514 has been described. Even in the structure of FIG. 14, the smoothing capacitor 518 can be disposed inside the secondary winding 514. This embodiment is described in FIG.

  FIG. 15 shows a cross-sectional view of an integral structure of the step-up transformer 510 and the smoothing capacitor 518. A primary winding 512 is wound around and fixed to a winding frame 506 provided on the outer periphery of the iron core 505. An insulator 508 is provided so as to cover the outer periphery of the primary winding 512, and a smoothing capacitor 518 including an electrode 536, an electrode 532, and a dielectric 534 is provided outside the insulator 508. An insulator 530 is disposed outside the smoothing capacitor 518 so as to cover the smoothing capacitor 518, and a secondary winding 514 is wound around and fixed to the insulator 530.

  One electrode 536 of the smoothing capacitor 518 is connected to one end of the secondary winding 514 via the rectifier 516, and the other electrode 532 of the smoothing capacitor 518 is connected to the other end of the secondary winding 514 via the lead wire 552. Connected to the end. Although not shown, the step-up transformer 520 and the smoothing capacitor 528 have the same configuration.

  The AC voltage output from the secondary winding 514 is rectified by the rectifier 516 and stored in the smoothing capacitor 518. Although not shown, the smoothing capacitor 518 is connected in series with the smoothing capacitor 528 as shown in FIG. 13, and the voltage stored in the smoothing capacitor 518 and the smoothing capacitor 528 is shown in FIG. Applied to the cathode 132 of the described X-ray tube 130.

  As described above, the structure shown in FIG. 15 can also achieve the effects described in FIG. In the circuit shown in FIG. 13, the number of capacitors to be used is one for each of the step-up transformer 510 and the step-up transformer 520, which is very small. When the number of capacitors to be used is small, the capacitor is arranged in a laminated state between the wound primary winding 512 and the wound secondary winding 514, so that the entire high voltage generating unit 240 is arranged. Becomes very compact. Therefore, it is very suitable for mounting on the rotating frame 110. Further, since the smoothing capacitor 518 is formed in a laminated structure with respect to the primary winding 512 and the secondary winding 514, the structure is very strong against the force acting on the high voltage generator 240 itself. Therefore, it is very suitable for mounting on the rotating rotating frame 110. For example, it is excellent in dealing with the centrifugal force generated as the rotating frame 110 rotates. Further, the high voltage generator 240 itself becomes relatively light, and the generated centrifugal force is reduced. Furthermore, the inertial force of the rotating frame 110 is reduced, and the controllability of the acceleration / deceleration control of the rotating frame 110 is improved. If the rotating frame 110 is unbalanced or has a large mass, a large burden is placed on the support mechanism of the rotating frame 110. The fact that the mass of the high voltage generator 240 is reduced leads to the effect that the rotating frame 110 suppresses imbalance and the like, and the burden on the support mechanism of the rotating frame 110 is reduced.

9. Description of Still Another Example of High Voltage Generating Unit 240 (1) Description of Capacitor Arrangement Structure Corresponding to Potential Change in Winding Axis Direction of Capacitor 332 described in FIG. 7 and described in FIG. 8, the capacitor 332 shown in FIG. 8, the resonance capacitor 282 shown in FIG. 10, the capacitor 332 and the capacitor 334 shown in FIG. 11, the smoothing capacitor 518 shown in FIG. 14, and the capacitor shown in FIG. The smoothing capacitor 518 has a single capacitor structure that is not divided in the axial direction of the iron core of the step-up transformer. The electrodes and dielectrics forming these capacitors are formed in a laminated structure with respect to the primary side winding or secondary winding of the step-up transformer. Since a voltage is generated between one end and the other end of the primary side winding and the secondary winding, the potential greatly changes along the axial direction of the iron core 256, that is, the axial direction of the winding. . On the other hand, the capacitors having a laminated structure with the windings form an integral electrode shape along the axial direction, and therefore have the same potential in the axial direction. As a result, a very large potential difference is generated between one or the other end of the secondary winding and the electrode of each capacitor.

  By dividing each capacitor described above in the axial direction, the potential difference between the electrode and the winding of each capacitor can be reduced. Assuming that the above capacitors are divided equally, the potential difference between the electrodes of the capacitors and the windings decreases in inverse proportion to the number of divisions. Further, the voltage between the electrodes of the capacitor having a structure that is not divided, if each capacitor is divided equally, decreases inversely. By dividing the capacitor in this way, the potential difference can be reduced, and insulation against the potential difference becomes very easy. For example, the thickness of the insulator between the capacitor and the winding can be reduced, or the thickness of the dielectric between the electrodes constituting the capacitor can be reduced. As a result, the high voltage generator 240 can be reduced in size and mass. This leads to a reduction in the load on the support portion of the rotating frame 110 and an improvement in acceleration / deceleration performance of the rotation speed, and also to a reduction in centrifugal force of the high voltage generator 240 mounted on the rotating frame 110.

  Since the description of each of the divided structures described above for each capacitor described above is complicated, the resonance capacitor 282 of FIG. 8 is representatively divided along the axial direction, and a plurality of divided capacitors are connected in series. The structure constituted by will be described with reference to FIG. Again, the structure described below can be similarly applied to the above-described capacitors.

  A winding frame 412 is provided so as to cover the outside of the iron core 256, and the primary side winding 262 is wound around the winding frame 412. In this embodiment, a winding frame 422 having an insulating function is provided outside the primary side winding 262, and the secondary winding 264 is wound around the winding frame 422. An insulator 432 having a shape that completely covers the outer periphery of the secondary winding 264 is provided outside the secondary winding 264, and a resonant capacitor 282 is formed outside the insulator 432.

  In the resonant capacitor 282 shown in FIG. 8, the electrode 634, the electrode 644, the electrode 654, and the electrode 664 are integrally connected, but in this embodiment, they are divided by the slit 638, the slit 648, and the slit 658, respectively. Similarly, the electrode 632, the electrode 642, the electrode 652, and the electrode 662 are also divided by the slit 636, the slit 646, and the slit 656, respectively. As a result, the capacitor 610 is formed by the electrode 632, the electrode 634, and the dielectric 454, the capacitor 612 is formed by the electrode 642, the slit 638, and the dielectric 454, and the capacitor 614 is formed by the electrode 642, the electrode 644, and the dielectric 454. Capacitor 616 is made of electrode 652, electrode 644 and dielectric 454, capacitor 618 is made of electrode 652, electrode 654 and dielectric 454, and capacitor 620 is made of electrode 662, electrode 654 and dielectric 454, and capacitor 622. Is made up of electrode 662, electrode 664, and dielectric 454, and these capacitors are connected in series.

  The resonant capacitor 282 in FIG. 8 is configured by a series circuit of seven capacitors, that is, the capacitor 610 and the capacitor 612, the capacitor 614, the capacitor 616, the capacitor 618, the capacitor 620, and the capacitor 622 shown in FIG. The voltage applied to the electrodes 632 and 664 is divided by the seven capacitors, and the voltage generated between the electrodes of each capacitor is greatly reduced. For example, if the capacitors are divided so that the characteristics are the same, the voltage generated between the electrodes of the capacitor is 1/7. Thus, by dividing the electrodes constituting the above-described capacitor, for example, the resonant capacitor 282, the voltage applied between the electrodes of each capacitor can be greatly reduced. Therefore, the thickness of the dielectric of each capacitor can be reduced. Since the thickness of the dielectric can be reduced, the distance between the electrodes constituting each capacitor is shortened and the capacitance of each capacitor is increased. However, since the capacitance of each capacitor depends on the opposing area of the electrodes, the opposing area decreases, which tends to decrease the capacitance of each capacitor. One method for maintaining or increasing the capacity is to increase the effective facing area by increasing the number of turns. Next, a capacitor sheet for forming a capacitor will be described, and a method for increasing the effective counter area by increasing the number of windings will be described.

  In the embodiment shown in FIG. 16, the slit formed on one electrode of the capacitor and the slit formed on the other electrode of the capacitor are formed so as to be shifted from each other at the axial position. One electrode and the other electrode of the capacitor not only act as an electrode of the capacitor but also act as a wiring for connecting the formed capacitors to each other. As a result, the wiring for connecting the capacitor can be eliminated, and the structure becomes very simple. This not only leads to miniaturization, but also improves reliability.

(2) Description of Sheet for Forming Capacitor (hereinafter referred to as “Capacitor Sheet”) FIG. 17 is a schematic diagram schematically illustrating the internal structure of the capacitor portion shown in FIG. In FIG. 16, a plurality of capacitors connected in series corresponding to the resonance capacitor 282 are formed on the insulator 432 provided outside the primary winding 262 and the secondary winding 264 wound around the iron core 256. ing. FIG. 17 shows a state in which a part of the capacitor sheet 670 for forming a plurality of capacitors corresponding to the resonant capacitor 282 is opened.

  An electrode sheet acting as an electrode 664, an electrode 654, an electrode 644, and an electrode 634 is divided and arranged by a slit 658, a slit 648, and a slit 638 on the surface of the dielectric sheet 454A corresponding to the dielectric 454 shown in FIG. Has been. In addition, an electrode sheet acting as the electrode 662, the electrode 652, the electrode 642, and the electrode 632 is arranged on the surface of the insulating sheet 454 </ b> B having an insulating property by being divided by a slit 656, a slit 646, and a slit 636. In this specification, a sheet is used as a term indicating a broad concept including a thin plate-like metal or metal film.

  The dielectric sheet 454A functions as a dielectric of the capacitor and has a withstand voltage characteristic that can withstand a voltage applied between the electrodes of the capacitor. The insulating sheet 454B has a withstand voltage characteristic as an insulator that can sufficiently withstand the voltage applied to both surfaces thereof. The dielectric sheet 454A and the insulating sheet 454B may be the same material. In the embodiment of FIG. 17, the electrode 664, the electrode 654, the electrode 644, and the electrode 634 are provided on the surface of the dielectric sheet 454A, and the electrode 662, the electrode 652, the electrode 642, and the electrode 632 are provided on the surface of the insulating sheet 454B. However, the electrode 664, the electrode 654, the electrode 644, and the electrode 634 are provided on one surface of the dielectric sheet 454A, and the electrode 662, the electrode 652, the electrode 642, and the electrode 632 are provided on the other surface of the dielectric sheet 454A. Also good. Even in this structure, a structure in which an insulating sheet 454B is provided is preferable in order to ensure insulation in the layer structure when wound. As described above, it is desirable that the capacitor sheet 670 has at least one electrode sheet positioned on both surfaces of the dielectric sheet 454A and the insulating sheet 454B for insulation.

  By increasing the facing area between the electrode 664, the electrode 654, the electrode 644, and the electrode 634 and the electrode 662, the electrode 652, the electrode 642, and the electrode 632, the capacitance of the capacitor can be increased. By increasing the number of windings of the capacitor sheet 670, the facing area between the electrode 664, the electrode 654, the electrode 644, and the electrode 634 and the electrode 662, the electrode 652, the electrode 642, and the electrode 632 can be increased, and the capacitor capacity is secured. can do. Thus, the method of forming the capacitor by winding the capacitor sheet 670 as many times as necessary has an effect of ensuring a sufficient capacitance of the capacitor. Further, since the electrode and the dielectric are wound around the iron core 256, there is an effect that the structure is mechanically strong against the external pressure. These capacitors are affected by vibration, centrifugal force, and inertial force associated with the rotation of the rotating frame 110. However, a capacitor formed by winding the capacitor sheet 670 has excellent mechanical characteristics that can sufficiently withstand these forces. Have.

(3) Description of Capacitor Sheet Without Slit By using a capacitor sheet 670 divided by slits such as slit 658 as shown in FIG. 17, the capacitor divided in the axial direction as shown in FIG. Can be formed. On the other hand, the capacitor 332 shown in FIG. 7, the resonance capacitor 282 shown in FIG. 8, the capacitor 332 shown in FIG. 8, the resonance capacitor 282 shown in FIG. 10, the capacitor 332 shown in FIG. 334 and the smoothing capacitor 518 shown in FIG. 14 and the smoothing capacitor 518 shown in FIG. 15 have structures that are not divided in the axial direction. In this case, the slit shown in FIG. 17 is not necessary. FIG. 18 shows the capacitor sheet 680 in a state where no slit is formed.

  In the capacitor sheet 680 shown in FIG. 18, an electrode sheet 682 is provided on the dielectric sheet 454A, and an electrode sheet 684 is provided on the insulating sheet 454B. By winding the capacitor sheet 680, the capacitor described in FIG. 7, FIG. 8, FIG. 10, FIG. 11, FIG. Note that the electrode sheet 684 may be provided on the back surface of the dielectric sheet 454A instead of the insulating sheet 454B. By increasing the number of windings of the capacitor sheet 680, the facing area between the electrode sheet 682 and the electrode sheet 684 provided so as to sandwich the dielectric sheet 454A can be increased, and a desirable capacity can be obtained.

10. Description of Effects of Embodiments to which the Present Invention is Applied According to the various embodiments described above, the electrodes and dielectrics constituting the capacitors are wound around the iron core or windings of the step-up transformer so as to form a laminated structure. Since it is arranged, the high voltage generator 240 can be made smaller than before. Therefore, the imaging part of the X-ray apparatus can be reduced in size. In particular, in the X-ray CT apparatus 10, the high voltage generation unit 240 is generally fixed to the rotating frame 110, and reducing the size or reducing the mass of the high voltage generating unit 240 saves space of the rotating frame 110. And greatly contribute to mass reduction. Since the rotating frame 110 is rotationally driven during X-ray imaging, the rotating frame 110 can be reduced in size and mass can be reduced if space can be saved. If the mass can be reduced, the acceleration / deceleration control characteristics are improved, and the burden on the bearing portion that supports the rotating frame 110 is reduced.

  By mechanically forming a capacitor used for the high voltage generator 240 by winding it around the iron core or winding of the step-up transformer so as to have a laminated structure, it can sufficiently withstand the centrifugal force applied to the capacitor. An excellent capacitor can be obtained. This also leads to improved reliability.

  When the capacitor is formed of the capacitor sheet 680 or 670, the capacity of the capacitor can be easily secured by increasing the number of windings, the structure is simple, and the productivity is extremely excellent. The connection distance between the step-up transformer and the capacitor is shortened, and it becomes easy to cope with the vibration accompanying the rotation of the rotating frame 110. The capacitor used in the high voltage generator 240 is rotated by forming a laminated structure in the core or winding of the boosting transformer or shortening the connection distance between the boosting transformer and the capacitor. It becomes easy to remove the mechanical resonance frequency against the low frequency vibration accompanying the rotation of the frame 110, and the mechanical reliability is improved.

  A series circuit of a plurality of capacitors can be formed by dividing the capacitor electrodes in the axial direction by slits. In this case, the applied voltage is divided by a plurality of capacitors divided by the slit, and the voltage applied between the electrodes can be reduced to a voltage divided by the number of divisions as compared with the case of one capacitor. Therefore, the withstand voltage required for the dielectric is reduced, and the dielectric sheet can be made thin. When the dielectric sheet is thin, the distance between the electrodes is reduced, and the effect of increasing the capacitance can be obtained.

  In the Cockcroft-Walton circuit, a plurality of capacitors are used for boosting. These capacitors can be formed to be stacked in layers with a structure that is laminated with the iron core and windings of the step-up transformer. In such a structure, the above-described effect becomes more remarkable. In addition, capacitors used in the Cockcroft-Walton circuit are formed in order from the capacitor with the lowest voltage toward the outer periphery, and the capacitor with the higher voltage is formed on the outer periphery. The structure is excellent in withstand voltage.

  Since the wound capacitor is firmly fixed to the step-up transformer, fixing the iron core of the step-up transformer to the casing 242 of the high voltage generator 240 allows the capacitor wound with a simple structure to be fixed. It can be supported, is very excellent in productivity, and has the effect of improving mechanical reliability.

  DESCRIPTION OF SYMBOLS 10 ... X-ray CT apparatus, 20 ... Bulkhead, 30 ... Imaging part, 40 ... Operation part, 82 ... Stand, 83 ... Stand, 100 ... Scanner, 104 ... Bed, 110 ... Rotating frame, 112 ... Opening, 120 ... X X-ray tube device, 122 ... collimator, 124 ... X-ray detection unit, 126 ... data collection device, 130 ... X-ray tube, 132 ... cathode, 134 ... anode, 140 ... heating transformer, 170 ... X-ray controller, 176 ... Cooling device, 180 ... console, 184 ... system control device, 186 ... image processing device, 188 ... storage device, 190 ... input / output device, 222 ... commercial power supply, 224 ... converter, 230 ... inverter, 240 ... high voltage generator 242 ... Case, 244 ... Frame, 246 ... Insulating oil, 250 ... High voltage transformer, 252 ... Mounting bracket, 254 ... Center axis, 256 ... Iron core, 260 ... Rise Transformer, 262 ... Primary winding, 264 ... Secondary winding, 266 ... V1 arrow, 270 ... Boosting transformer, 276 ... V2 arrow, 282 ... Resonance capacitor, 284 ... Resonance capacitor, 300 ... High voltage rectification 302, rectifier, 304 ... rectifier, 306 ... rectifier, 308 ... rectifier, 312 ... rectifier, 314 ... rectifier, rectifier 316, 318 ... rectifier, 332 ... capacitor, 334 ... capacitor, 336 ... capacitor, 338 ... capacitor, 342 ... capacitor, 344 ... capacitor, 412 ... winding frame, winding frame ... 422, 432 ... insulator, 442 ... electrode, 444 ... dielectric, 446 ... electrode, 448 ... lead wire, 449 ... lead wire, 452 ... electrode, 454 ... Dielectric material, 454A ... Dielectric sheet, 454B ... Insulating sheet, 456 ... Electrode, 462 ... Lead wire, 464 ... Li 472 ... insulator, 482 ... electrode, 484 ... dielectric, 486 ... lead wire, 488 ... lead wire, 510 ... boost transformer, 512 ... primary winding, 514 ... secondary winding, 516 ... rectifier 518: Smoothing capacitor, 520 ... Step-up transformer, 522 ... Primary winding, 524 ... Secondary winding, 528 ... Smoothing capacitor, 610 ... Capacitor, 612 ... Capacitor, 614 ... Capacitor, 616 ... Capacitor, 618 ... Capacitor , 620 ... capacitor, 622 ... capacitor, 632 ... electrode, 634 ... electrode, 638 ... slit, 642 ... electrode, 644 ... electrode, 646 ... slit, 648 ... slit, 652 ... electrode, 654 ... electrode, 658 ... slit, 662 ... Electrode, 664 ... Electrode, 670 ... Capacitor sheet, 680 ... Capacitor sheet, 682 ... Electrode sheet, 6 84 ... Electrode sheet.

Claims (10)

An X-ray tube device having an X-ray tube for generating X-rays for irradiating a subject;
A high voltage generating section for generating a DC high voltage to be applied to the X-ray tube;
An X-ray detection unit that detects X-rays transmitted through the subject and converts them into electrical signals;
An operation unit for performing an X-ray imaging operation and displaying an X-ray image generated based on an electrical signal from the X-ray detection unit;
The high voltage generator includes a step-up transformer for stepping up an AC voltage, a capacitor, and a rectifier,
The step-up transformer has a primary side winding and a secondary winding wound around an iron core,
The capacitor is formed including the secondary winding of the step-up transformer and an electrode disposed in a laminated state, and a dielectric disposed in the laminated state with the secondary winding.
An X-ray apparatus characterized by that. The X-ray apparatus according to claim 1,
The high voltage generator includes the boosting transformer for boosting an alternating voltage, and the Cockcroft-Walton circuit that includes the capacitor and the rectifier to rectify the output voltage of the boosting transformer and further boost the voltage. ,
The primary winding and the secondary winding are wound around the iron core of the step-up transformer, and further, the two electrodes constituting the capacitor of the Cockcroft-Walton circuit and the dielectric are the primary It is wound on an insulator provided so as to form a laminated structure with the side winding and the secondary winding,
An X-ray apparatus characterized by that. The X-ray apparatus according to claim 1,
The Cockcroft-Walton circuit included in the high voltage generation unit includes a plurality of capacitors for boosting, each of the plurality of capacitors includes the two electrodes and the dielectric, and the inner height of the plurality of capacitors. The capacitor on the voltage side is formed on the outer peripheral side, and the two electrodes of the capacitors and the dielectric are each formed by being wound in a laminated state.
An X-ray apparatus characterized by that. The X-ray apparatus according to claim 1,
The capacitor of the high voltage generator is a resonant capacitor connected in parallel with the secondary winding of the step-up transformer, the resonant capacitor having two electrodes and the dielectric, The electrode and the dielectric are wound around an insulator provided so as to form a laminated structure with the primary winding and the secondary winding,
An X-ray apparatus characterized by that. The X-ray apparatus according to claim 1,
The capacitor of the high voltage generation unit is a smoothing capacitor connected in parallel to the secondary winding of the step-up transformer via a rectifier, and the smoothing capacitor includes two electrodes and the dielectric The electrode and the dielectric are wound around an insulator provided so as to form a laminated structure with the primary winding and the secondary winding,
An X-ray apparatus characterized by that. The X-ray apparatus according to any one of claims 1 to 5,
The X-ray tube apparatus, the high voltage generation unit, the high voltage generation unit, and the X-ray detection unit are provided in a predetermined positional relationship and rotate according to an X-ray imaging schedule. A gantry control device for controlling according to a schedule,
The step-up transformer, the capacitor, and the rectifier that the high voltage generation unit has rotate with the rotation of the rotating frame.
An X-ray apparatus characterized by that. The X-ray apparatus according to any one of claims 1 to 6,
The electrode and the dielectric forming the capacitor of the high voltage generating unit are wound so as to form a laminated structure on the outer periphery of the secondary winding,
An X-ray apparatus characterized by that. The X-ray apparatus according to any one of claims 1 to 6,
The electrode and the dielectric forming the capacitor of the high voltage generator are wound so as to form a laminated structure at a position between the primary side winding and the secondary winding of the step-up transformer. ing,
An X-ray apparatus characterized by that. The X-ray apparatus according to any one of claims 1 to 8,
The capacitor of the high-voltage generating unit includes an electrode sheet disposed inside and outside the dielectric sheet so as to sandwich the dielectric sheet, and an insulating sheet provided further outside the electrode sheet disposed outside. A capacitor sheet having a secondary winding and a laminated structure was formed by winding.
An X-ray apparatus characterized by that. The X-ray apparatus according to any one of claims 2 to 9,
Assuming that the longitudinal direction of the iron core of the boosting transformer is the axial direction, the primary winding and the secondary winding of the boosting transformer are wound in the circumferential direction of the axial direction, and The two electrodes forming the capacitor in the direction and the dielectric sandwiched between the two electrodes are wound,
The wound two electrodes of the capacitor are each divided in a direction crossing the axial direction, so that the capacitor is constituted by a series circuit of divided capacitors formed by the divided two electrodes.
An X-ray apparatus characterized by that.

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