JP2017157468A - High breakdown voltage transformer for x-ray tube and x-ray device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high breakdown voltage transformer further suitable for supplying high voltage to an X-ray tube device of an X-ray device, or to provide an X-ray device using the same.SOLUTION: A high breakdown voltage transformer for an X-ray tube comprises: an iron core; a primary winding wound on the iron core; and a secondary winding wound on the iron core so as to pile with the primary winding. The secondary winding is formed to a plurality of layers and wound. A first layer, which is in an outermost periphery of the plurality of layers, has a length L1 in a direction along with the iron core, and the length L1 is shorter than a length L2, which is a length of a second layer closer to the iron core than the first layer in the plurality of layers, in the direction along with the iron core. Moreover, both ends of the first layer are inside of both ends of the second layer in the direction along with the iron core, and the secondary winding outputs voltage which is used to generate voltage supplied to the X-ray tube.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an X-ray apparatus for performing fluoroscopy or imaging of a subject using X-rays, including an X-ray CT apparatus, and in particular, for supplying a high voltage to an X-ray tube apparatus mounted on the X-ray apparatus. The present invention relates to a high voltage transformer and an X-ray apparatus using the same.

  X-ray apparatuses that perform X-ray fluoroscopy or imaging using X-rays, including X-ray CT apparatuses, are equipped with an X-ray tube for generating X-rays. The X-ray tube device generates thermionic electrons at the cathode, converts the generated thermionic electrons into an electron beam state, further accelerates by a high electric field and collides with the anode, and generates X-rays. In order to accelerate the electron beam, a high voltage of, for example, about several tens of kV to 100 kV is applied between the cathode and the anode of the X-ray tube apparatus. In order to supply such a high voltage to the X-ray tube device, a high voltage generator is provided, and the high voltage generator has a high voltage transformer for boosting the supplied voltage to a very high voltage. Is provided.

  In the high voltage transformer, for example, an internal winding or the like is required to have a structure in which electric field concentration corresponding to the high voltage is reduced. A structure in which a high voltage transformer is resin-molded is one solution to alleviate electric field concentration. An example of such a resin mold type high voltage transformer is described in Patent Document 1.

JP 2005-32829 A

  A high voltage transformer used to supply a high voltage to the X-ray tube apparatus is required to be downsized and / or lightweight. The above-described high voltage transformer with a resin mold structure is excellent in terms of alleviating the concentration of the internal electric field, but has a problem in miniaturization or weight reduction. In other words, it is suitable for high voltage supply, but in addition to that, it is more suitable for use in a high voltage generator for supplying high voltage to the X-ray tube apparatus of the X-ray apparatus. It is required to be a transformer.

  An object of the present invention is to provide a high voltage transformer that is more suitable for supplying a high voltage to an X-ray tube apparatus of an X-ray apparatus, or to provide an X-ray apparatus using the same.

  A high voltage transformer for an X-ray tube according to the present invention includes an iron core, a primary winding wound around the iron core, and a secondary winding wound around the iron core over the primary winding, The secondary winding is wound by forming a plurality of layers, and a length L1 along the iron core of the first layer located on the outermost periphery of the plurality of layers is the secondary winding. The plurality of layers are shorter than a length L2 in the direction along the iron core in the second layer located on the iron core side of the first layer, and both end portions of the first layer are respectively in the direction along the iron core. A voltage that is located inside both ends of the second layer and is used to generate a voltage to be supplied to the X-ray tube is output from the secondary winding.

  According to the present invention, it is possible to obtain a high voltage transformer which is more suitable for supplying a high voltage to an X-ray tube apparatus or an X-ray apparatus using the same.

It is explanatory drawing which shows an example of the X-ray apparatus to which this invention was applied. It is explanatory drawing explaining the outline | summary of the high-voltage generator and X-ray tube apparatus described in FIG. It is explanatory drawing which shows an example of the high voltage | pressure-resistant transformer to which this invention was applied. It is explanatory drawing explaining the winding state of the part of the dashed-dotted line A of FIG. It is explanatory drawing explaining the distribution state of the electric field strength in the secondary winding described in FIG. It is explanatory drawing explaining the distribution state of the electric field strength in the secondary winding based on a prior art.

1. 1. Introduction Modes for carrying out the invention described below (hereinafter referred to as “embodiments”) are studied from various viewpoints and solve various problems. One of the problems to be solved is the contents described in the column of problems to be solved by the above-described invention, and the following embodiments can solve other problems as well. These will be described in the following embodiments. The embodiments described below also have effects other than the contents described in the column of the effects of the invention described above. The effects of the following embodiments, including the contents described in the column of the effects of the invention described above, will be described in the description of the embodiments.

  Further, in the drawings used to describe the embodiments described below, configurations denoted by the same reference numerals have substantially the same configuration contents, and have substantially the same effects. The description of the configuration, operation, and effect related to the configuration with the same reference numerals will not be repeated in order to avoid complexity.

2. Outline of X-ray apparatus 100 An X-ray apparatus to which the present invention is applied will be described with reference to the accompanying drawings. Note that the present invention is applicable to various types of X-ray apparatuses including X-ray CT, as long as the X-ray apparatus has a configuration for generating X-rays by supplying a high voltage from the high-voltage generator to the X-ray tube apparatus. As an example, an embodiment will be described using the X-ray apparatus shown in FIG.

  The X-ray apparatus 100 has passed through the subject 50, an X-ray tube device 200 for irradiating the subject 50 mounted on the bed 70 with X-rays, an X-ray diaphragm device 110 for defining an X-ray irradiation range, and the like. An X-ray detection device 152 that detects X-rays, a control device 150, and a high voltage generator 250 that supplies a high voltage to the X-ray tube device 200 are provided. The control device 150 stores an image processing device 154 that performs image processing based on the detection result of the X-ray detection device 152, an X-ray image generated by processing by the image processing device 154, or other necessary information. A storage device 156 that stores data, a display device 166 that displays an X-ray image generated by processing by the image processing device 154, the entire X-ray device 100 and each configuration, and necessary arithmetic processing. A central processing unit 162 that performs the operation, and an input device 164 that inputs necessary information and performs operations for X-ray fluoroscopy and X-ray imaging.

  A high voltage is supplied from the high voltage generator 250 to the X-ray tube apparatus 200 according to operations of X-ray fluoroscopy and X-ray imaging with respect to the subject 50, and X-rays are irradiated from the X-ray tube apparatus 200 toward the subject 50. . The X-ray irradiation range and irradiation angle are defined by the X-ray diaphragm device 110. X-rays transmitted through the subject 50 are detected by the X-ray detection device 152, and an X-ray image is generated by the image processing device 154 based on the detection result of the X-ray detection device 152.

3. Outline of High Voltage Generating Apparatus 250 and X-ray Tube Apparatus 200 FIG. 2 is an explanatory diagram for explaining the outline of the high voltage generating apparatus 250 and the X-ray tube apparatus 200. The X-ray tube apparatus 200 is filled with insulating oil in order to maintain electrical insulation against high voltage, and the X-ray tube 210 is provided in a state in which electrical insulation is maintained by the insulating oil. . The X-ray tube 210 is provided with a cathode 212 having a filament 214 for generating thermoelectrons and an anode 216 for generating X-rays when the electron beam 202 collides. The electron beam 202 has high kinetic energy, and when it collides with the anode 216, X-rays are generated by the high kinetic energy. However, the anode 216 may be damaged because it generates a large amount of heat. The anode 216 is mechanically connected to the motor 220 via the rotating shaft 226. The anode 216 is rotated by the motor 220, and the collision position of the anode 216 by the electron beam 202 is always moved. As a result, damage to the anode 216 by the electron beam 202 can be prevented. The motor 220 includes a coil 222 and a rotor 224, and the motor 220 is rotated by a drive current from the motor control circuit 242, and the rotation speed of the anode 216 is started and stopped by the motor control circuit 242. Be controlled.

  The filament 214 is heated based on the current from the heating current control circuit 244 and emits thermoelectrons. The emitted thermoelectrons are converged by a focusing electrode (not shown) to be in the state of an electron beam 202 and collide with the anode 216. By increasing the kinetic energy of the electron beam 202, the X-ray dose emitted from the anode 216 increases, so that a high voltage is applied from the high voltage generator 250 between the cathode 212 and the anode 216, whereby the electron beam 202 is accelerated to obtain large kinetic energy.

  Next, an example of the high voltage generator 250 will be described. The high voltage generator 250 includes a rectifier circuit 252, a converter circuit 254, an inverter circuit 256, a high voltage transformer 300, a rectifier circuit 258, and a smoothing circuit 262. The AC power supplied from the AC power supply 240 is rectified by the rectifier circuit 252 and boosted by the converter circuit 254 to generate a boosted DC voltage. However, this is not sufficient, and the electron beam 202 cannot be sufficiently accelerated. The DC voltage boosted by the converter circuit 254 is converted into a high-frequency AC voltage by the inverter circuit 256. The high voltage transformer 300 boosts the high-frequency AC voltage generated by the inverter circuit 256 to generate a high voltage of, for example, tens of thousands of volts or higher. The AC voltage boosted by the high voltage transformer 300 is rectified by the rectifier circuit 258 and smoothed by the smoothing circuit 262, and applied with a polarity such that the cathode 212 is negative and the anode 216 is positive. As described above, the applied high voltage accelerates the electron beam 202, gives high kinetic energy, and collides with the anode 216 to generate X-rays.

  As described above, the high voltage generator 250 shown in FIG. 2 is an example of a circuit to which the present invention is applied, and the application of the present invention is not limited to this.

4). High Voltage Transformer 300 An example of the high voltage transformer 300 is shown in FIG. FIG. 4 schematically shows the structure of the secondary winding 340 and the secondary winding 350 in the portion indicated by the one-dot chain line A in FIG. The structure of the secondary winding 340 and the secondary winding 350 of the first high voltage transformer 302 as well as the second high voltage transformer 304 has the same structure as shown in FIG. As a representative of these, only the secondary winding of the second high voltage transformer 304 is shown in FIG.

  The iron core 310 constitutes two sets of high voltage transformers, a first high voltage transformer 302 and a second high voltage transformer 304. The first high voltage transformer 302 and the second high voltage transformer 304 include a primary winding 330, a secondary winding 340, and a secondary winding 350, respectively. Since these have substantially the same configuration and substantially the same function and effect, the same reference numerals are assigned to the corresponding configurations of the high voltage transformers in each group. Since each set acts as a high voltage transformer and outputs a boosted high voltage, even one set can function sufficiently. By configuring two sets of high voltage transformers as in this embodiment, it is possible to supply the high voltage to the X-ray tube 210 by, for example, converting each set of output voltages to a DC voltage and then connecting them in series. It becomes possible to supply a voltage higher than only one set to the X-ray tube 210. A high voltage is required for the power supplied to the X-ray tube 210, but a very small supply current value is required, and thus such a configuration is possible. In the following description, the second high voltage transformer 304 will be described as a representative, but the first high voltage transformer 302 is exactly the same.

  Each of the first high voltage transformer 302 and the second high voltage transformer 304 has a bobbin 320. The bobbin 320 may have a structure in which all of the primary winding 330, the secondary winding 340, and the secondary winding 350, that is, both the primary winding and the secondary winding are wound. Only the secondary winding composed of the secondary winding 340 and the secondary winding 350 may be wound on the side. In this embodiment, as an example, it is assumed that the bobbin 320 is disposed on the outer peripheral side of the primary winding 330 and only the secondary winding 340 or the secondary winding 350 is wound. To do.

  The secondary windings of the first high-voltage transformer 302 and the second high-voltage transformer 304 are each divided into two, one being wound as a secondary winding 340 and the other being wound as a secondary winding 350. A secondary winding is formed by connecting the secondary winding 340 and the secondary winding 350 in series. The bobbin 320 separates one and the other of the secondary windings, and has an intermediate insulating layer 322 for maintaining insulation between them. In the direction along the iron core 310, the secondary winding 340 is wound on one side divided by the intermediate insulating layer 322, and the secondary winding 350 is wound on the other side divided by the intermediate insulating layer 322. As described above, the bobbin 320 fixes the secondary winding 340 and the secondary winding 350 and maintains electrical insulation between the secondary winding 340 and the secondary winding 350, and further, the primary winding 330. In order to maintain the electrical insulation between the intermediate insulating layer 322 and the bottom 324. Further, the intermediate insulating layer 322 has a shape that protrudes further in the outer peripheral direction than the outermost peripheral layer of the secondary winding 340 or the secondary winding 350, and the intermediate winding 322 is formed between the secondary winding 340 and the secondary winding 350. The electrical insulation between them is enhanced. Due to such a shape of the intermediate wall 322, a high voltage is applied between the layer 341 that is the outermost periphery of the secondary winding 340 and the layer 358 that is the outermost periphery of the secondary winding 350. The insulation between them is maintained.

  Furthermore, a space is formed between the intermediate wall 322 and the end of each of the layers 341 to 344 of the secondary winding 340 on the intermediate insulating layer 322 side. Moreover, these spaces become so large that it is located in the outer peripheral side. Similarly, regarding the layer 355, the layer 365, the layer 357, and the layer 358 of the secondary winding 350, the space between the intermediate winding 322 and the intermediate insulating layer 322 becomes larger as it is located on the outer peripheral side. This space not only acts to alleviate the concentration of the electric field, but also has a great effect on maintaining electrical insulation between the secondary winding 340 and the secondary winding 350.

  Electrical insulation between the secondary winding 340 and the secondary winding 350 disposed on the outer peripheral side of the primary winding 330 and the primary winding 330, and the secondary winding 340 and the secondary winding 350 A press board 326 is provided for fixing. When a high frequency AC voltage is supplied to the primary winding from the inverter circuit 256, the voltage boosted based on the relationship between the number of turns of the primary winding 330 and the number of turns of the secondary winding 340 or the secondary winding 350 is increased. The secondary winding composed of the secondary winding 340 and the secondary winding 350 is output.

5. Regarding the structure of the secondary winding 340 and the secondary winding 350 of the high voltage transformer 300 As described above, in this embodiment, as an example, the secondary winding of the high voltage transformer 300 includes the secondary winding 340 and the secondary winding. It is comprised with the line 350, and the shape of each layer has comprised the shape typically described in FIG. The secondary winding 340 and the secondary winding 350 of the high voltage transformer 300 are wound around a bobbin 320 provided on the outer periphery of the primary winding 330 via a press board 326. As an example, the secondary winding 340 includes eight layers 341 to 348, and the secondary winding 350 includes eight layers 351 to 358. The secondary winding 340 and the secondary winding 350 are connected in series by electrically connecting the layer 348 and the layer 351.

  In the plurality of layers close to the primary winding 330, the length L of each layer formed by winding the secondary winding is substantially the same length, and in the plurality of layers on the outer peripheral side, the winding of the secondary winding is the same. The length L of each layer formed by the rotation is shortened so that the outer peripheral layer is positioned at both ends on the inner side. In addition, although the length of each layer is set to L, in order to avoid the complexity of illustration, the display of length L is abbreviate | omitted from the layer 342 to the layer 348. The same applies to the secondary winding 350. Only the outermost layer 358 displays the length L, and the layers 357 to 351 omit the display of the length L. The structure in which both ends of the outer peripheral layer are located inside is the same in the secondary winding 340 and the secondary winding 350. Although the description has been given with reference to FIG. 4 for the portion of the one-dot chain line A of the second high voltage transformer 304 in FIG. 3, the secondary winding 340 and the secondary winding 350 of the second high voltage transformer 304 are illustrated as a whole. 4 and the secondary winding 340 and the secondary winding 350 of the first high voltage transformer 302 have the same structure.

6). Structure of Secondary Winding 340 and Secondary Winding 350 of High Voltage Transformer 300 and Electric Field Strength FIG. 5 is a result of simulating the electric field strength in the structure of secondary winding 340 in FIG. The electric field strength in the vicinity of the is low, and the concentration of the electric field is suppressed. A specific example simulated is a secondary winding having an eight-layer structure. Layers 345 to 348 have 100 turns per layer, and each layer has a length L of about 40 mm. The length L of the fifth layer which is the layer 344 is 38 mm, the length L of the sixth layer which is the layer 343 is 36 mm, the length L of the seventh layer which is the layer 342 is 34 mm, and the eighth layer which is the layer 341 The length L is 32 mm. As a result of the simulation, the region 402, the region 404, and the region 406 indicated by the broken lines show electric field strengths close to each other, and all of them were relatively low values. In addition, there was no rapid concentration or change in the electric field.

  FIG. 6 is a simulation result of the electric field strength of the secondary winding made based on the conventional technique. From layer 1 to layer 7 composed of layers 452 to 458, the number of turns of each layer is 100 turns, and the length L is about 40 mm. The eighth layer 451 has a fraction in the number of turns and a length L of 20 mm. As a result of the simulation, in the conventional method, the electric field strength in the region 412 at the end of the outermost peripheral layer 451 becomes very high. For example, the region 412 illustrated in FIG. 6 has an electric field strength twice or more that of the region 402 or the region 406 at the end of the layer 341 illustrated in FIG. 5 to which the present invention is applied. Further, the electric field strength of the end region 414 of the layer 452 shown in FIG. 6 is also increased, and the electric field strength of the end region 402 and the region 406 of the layer 341 shown in FIG. The electric field strength was higher than double.

  As can be seen from the description of FIG. 5 and FIG. 6, the structure described with reference to FIG. 4 has a lower electric field strength than the conventional structure of FIG. This has the effect of reducing the size of the high voltage transformer 300 shown in FIG. Further, the influence on other devices is also reduced, and the entire apparatus including the high voltage generator 250 can be downsized and further reduced in weight. That is, by applying the present invention, the reliability of the X-ray imaging apparatus is improved, and the shape of the entire apparatus related to irradiating X-rays can be reduced. Also, the weight can be reduced. In an apparatus that performs X-ray imaging by changing the imaging surface of the subject 50 including X-ray CT, it is necessary to move or rotate equipment related to X-ray irradiation including the high-voltage generator 250. With respect to such an X-ray imaging apparatus, the overall shape of the apparatus related to irradiating X-rays is reduced in size and weight, so that a very large effect is brought about.

7). Other Embodiments The configuration described in FIG. 1 is an example of the X-ray apparatus 100 and is not limited to this. Even for various types of X-ray apparatuses, it is necessary to include the X-ray tube apparatus 200 and the high voltage generator 250, and the above-described great effects can be obtained by applying the present invention.

  The high voltage generator 250 shown in FIG. 2 is an example, and the above-described great effect can be obtained by applying the present invention as long as it has a configuration in which the voltage is boosted using the high voltage transformer 300.

  The high-voltage transformer 300 shown in FIG. 3 has two sets of transformers, a first high-voltage transformer 302 and a second high-voltage transformer 304, with respect to the iron core 310. The present invention can be applied to either one of the high-voltage transformers 304, and a great effect can be obtained in terms of improvement in reliability, size reduction, and weight reduction.

  In the high voltage transformer 300 shown in FIG. 3, the secondary winding is divided into a secondary winding 340 and a secondary winding 350, which are arranged side by side in a direction along the iron core. That is, secondary windings having a layer length L shorter than the layer length of the primary winding 330 are arranged side by side on the outer peripheral side of the layer of the primary winding 330. By doing in this way, the high voltage | pressure-resistant transformer 300 can be reduced in size and it is effective also in weight reduction. Further, the difference in potential between both ends of each layer becomes relatively small, and the insulation between the layers becomes easy. For example, sufficient insulation can be maintained without using a resin molding. Insulating paper is provided between the layers.

  However, the secondary winding is not divided like the secondary winding 340 or the secondary winding 350, but a layer having a length almost equal to the length of the layer of the primary winding 330 on the outer peripheral side of the primary winding 330. A secondary winding may be configured.

  In the structure of the secondary winding shown in FIG. 4 and FIG. 5, the structure is such that the both end portions of the outer peripheral side four layers are gradually positioned on the inner side, that is, the layer length L is gradually increased toward the outer side. It is configured to be shorter. However, the configuration of the four layers in this way is an example, and may be three layers, five layers or more.

  50 ... subject, 70 ... bed, 100 ... X-ray device, 110 ... X-ray diaphragm device, 150 ... control device, 152 ... X-ray detection device, 154 ... Image processing device, 156: Storage device, 162: Central processing device, 164 ... Input device, 166 ... Display device, 200 ... X-ray tube device, 202 ... Electron beam, 204 ... X-ray, 210 ... X-ray tube, 212 ... cathode, 214 ... filament, 216 ... anode, 220 ... motor, 222 ... coil, 224 ... rotor 226... Rotating shaft 240 240 AC power source 242 Motor control circuit 244 Heating current control circuit 250 High voltage generator 252 Rectifier circuit 254 ..Converter circuit, 256 ... Inverter circuit, 258 ..Rectifier circuit, 262 ... Smoothing circuit, 300 ... High voltage transformer, 302 ... First high voltage transformer, 304 ... Second high voltage transformer, 310 ... Iron core, 320 ... Bobbin, 322 ... Intermediate wall, 324 ... Bottom, 326 ... Press board, 330 ... Primary winding, 340 ... Secondary winding, 350 ... Secondary winding, 341 .. layer, 342 ... layer, 343 ... layer, 344 ... layer, 345 ... layer, 346 ... layer, 347 ... layer, 348 ... layer, 351 ... Layer, 352 ... layer, 353 ... layer, 354 ... layer, 355 ... layer, 365 ... layer, 357 ... layer, 358 ... layer, 402 ... region, 404 ... region, 406 ... region, 451 ... layer, 452 ... layer, 453 ... layer, 454 ... Layer, 455 ... layer, 456 ... layer, 457 ... layer, 458 ... layer, 412 ... area, 414 ... area.

Claims (10)

An iron core, a primary winding wound around the iron core, and a secondary winding wound around the iron core over the primary winding,
The secondary winding is wound in a plurality of layers,
A length L1 in the direction along the iron core of the first layer located on the outermost periphery of the plurality of layers is positioned closer to the iron core than the first layer of the plurality of layers of the secondary winding. Shorter than the length L2 in the direction along the iron core in the two layers,
Further, both end portions of the first layer are located inside the both end portions of the second layer in the direction along the iron core, and voltages used for generating a voltage to be supplied to the X-ray tube are Output from the secondary winding,
A high voltage transformer for an X-ray tube. In the high voltage | pressure-resistant transformer for X-ray tubes of Claim 1,
Located on the iron core side of the first layer and the second layer of the secondary winding, on the length L1 in the direction along the iron core of the first layer and the iron core of the second layer A plurality of layers having a length longer than the length L2 in the direction along the direction are provided.
A high voltage transformer for an X-ray tube. 2. The high voltage transformer for an X-ray tube according to claim 1, wherein the secondary winding includes a first secondary winding and a second secondary winding, and is located on an outer peripheral side of the primary winding. Further, the first secondary winding and the second secondary winding are arranged in a direction along the iron core,
In the first secondary winding and the second secondary winding, a length L1 in the direction along the iron core of the first layer of the secondary winding located at the outermost periphery is the length of the secondary winding. Shorter than a length L2 in the direction along the iron core of the second layer of the secondary winding located on the iron core side from the first layer,
Further, both end portions of the first layer are located inside the both end portions of the second layer in the direction along the iron core,
A high voltage transformer for an X-ray tube. In the high voltage | pressure-resistant transformer for X-ray tubes of Claim 3,
Located between the first secondary winding and the second secondary winding, from the outermost layer of each of the first secondary winding and the second secondary winding from the iron core side Has an intermediate insulating layer extending further outward,
A high voltage transformer for an X-ray tube. In the high voltage transformer for X-ray tube according to claim 4,
The distance between the intermediate insulating layer and the end on the side of each intermediate insulating layer of the first layer where the outermost circumferences of the first secondary winding and the second secondary winding respectively exist is An end portion of each of the second layers existing on the inner side of the first layer where the outermost periphery of each of the first secondary winding and the second secondary winding exists, and the intermediate insulating layer The first secondary winding and the second secondary winding are made to be longer than the distance between
A high voltage transformer for an X-ray tube. In the high voltage | pressure-resistant transformer for X-ray tubes of Claim 1,
A first high withstand voltage transformer and a second high withstand voltage transformer are formed on the iron core, and the first high withstand voltage transformer and the second high withstand voltage transformer are each wound around the primary winding wound around the iron core, and the primary Having the secondary winding wound around the iron core over the winding;
The secondary winding is wound in a plurality of layers,
The secondary winding in which the length L1 in the direction along the iron core of the first layer located on the outermost periphery of the plurality of layers is located closer to the iron core than the first layer of the secondary winding. Shorter than the length L2 in the direction along the iron core of the second layer of wire,
Further, both end portions of the first layer are located inside the both end portions of the second layer in the direction along the iron core,
A high voltage transformer for an X-ray tube. The high voltage transformer for an X-ray tube according to claim 6,
The secondary windings of the first high-voltage transformer and the second high-voltage transformer each include the first secondary winding and the second secondary winding;
The first secondary winding and the second secondary winding are arranged side by side in the direction along the iron core located on the outer peripheral side of the primary winding,
In the first secondary winding and the second secondary winding, the length L1 in the direction along the iron core of the first layer of the secondary winding located on the outermost periphery is the length of the secondary winding. Shorter than the length L2 in the direction along the iron core of the second layer of the secondary winding located on the iron core side of the first layer,
Further, both end portions of the first layer are located inside the both end portions of the second layer in the direction along the iron core,
A high voltage transformer for an X-ray tube. The high voltage transformer for an X-ray tube according to claim 7,
The first high-voltage transformer and the second high-voltage transformer are located between the first secondary winding and the second secondary winding, and from the iron core side, the first secondary winding, An intermediate insulating layer extending further outward than the outermost peripheral layer of each of the second secondary windings;
The distance between each intermediate insulating layer side end of the first layer where the outermost periphery of each of the first secondary winding and the second secondary winding exists and the intermediate insulating layer is the first The intermediate insulating layer and the end of the second layer existing on the inner side of the first layer existing on the outermost periphery of each of the secondary winding and the second secondary winding and the intermediate insulating layer The first secondary winding and the second secondary winding are made to be longer than the distance between them,
A high voltage transformer for an X-ray tube. An X-ray tube device for irradiating the subject with X-rays, an X-ray detection device for detecting X-rays transmitted through the subject, and a high voltage for supplying a high voltage to the X-ray tube device And the high voltage generator has a high voltage transformer for an X-ray tube,
The high-voltage transformer is a high-voltage transformer for an X-ray tube according to one of claims 1 to 8.
An X-ray apparatus using a high voltage transformer for an X-ray tube. The high-voltage generator includes a converter circuit that generates an AC voltage supplied to the high-voltage transformer for the X-ray tube, and a rectifier circuit that rectifies the output of the high-voltage transformer for the X-ray tube, and rectifies by the rectifier circuit Supplying the high voltage to the X-ray tube device based on the measured voltage;
An X-ray apparatus using the high voltage transformer for an X-ray tube according to claim 9.

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