Voltage dividing detection integrated type x-ray tube device

Abstract

This patent application provides an integrated X-ray tube device for voltage divider detection, including a vacuum housing element, an anode assembly, a cathode assembly, and a resistive voltage divider at both ends of the vacuum housing element. The resistive voltage divider is composed of a main voltage divider and a secondary voltage divider connected in series and connected in parallel between the two electrode assemblies, wherein at least the main voltage divider is a thin-film resistor attached to the inner surface of the vacuum housing element. This technical solution, combining a voltage divider with an X-ray tube, significantly reduces the technical problem of excessive space occupation in limited instrument equipment, while also lowering costs.

Description

Technical Field

[0001] This patent application relates to an X-ray tube. Background Technology

[0002] As the core component of X-ray instruments, the X-ray tube requires extremely high operating voltage, sometimes up to 600KV, to generate the required radiation. It also requires high technical performance in terms of insulation of the related control circuits and devices connected to the X-ray tube, resulting in high technical investment costs.

[0003] To control and ensure the operational stability and reliability of the X-ray tube device, it is essential to sample and monitor the operating voltage of the anode or cathode of the X-ray tube using a voltage-dividing resistor. The voltage-dividing resistor of the X-ray tube device consists of many series-connected resistors, positioned between the anode and cathode of the X-ray tube, such as... Figure 1 The circuit diagram shown illustrates a detection line drawn from a voltage divider resistor at the end to obtain a stepped-down voltage. The total applied voltage is then calculated to obtain the reverse working voltage applied to the anode or anode-grounded cathode. Existing voltage divider resistors are external devices. Not only must their resistor strings be insulated with epoxy resin or similar materials, but their electrical connection to the X-ray tube must also be protected against high-voltage insulation. Therefore, these external devices present technical challenges: large size, occupying valuable space within the instrument, high cost, demanding external connection technology, and reliability risks. This makes it difficult to meet the miniaturization, low cost, and high reliability requirements of various application fields. Summary of the Invention

[0004] The purpose of this patent application is to achieve miniaturization of the overall instrument and equipment. Starting with the voltage divider resistor, the invention changes the composition of its peripheral devices to simplify the composition of the X-ray generation system, reduce the size of the device, and reduce the cost, thereby providing a voltage divider detection integrated X-ray tube device.

[0005] The technical solution of the voltage divider detection integrated X-ray tube device provided in this patent application is as follows: a voltage divider detection integrated X-ray tube device, including a vacuum housing element, wherein one end of the vacuum housing element is a cathode assembly and the other end is an anode assembly, and the device also includes a resistive voltage divider section;

[0006] The voltage divider is composed of a main voltage divider and a secondary voltage divider connected in series and connected in parallel between the two pole components. The voltage divider nodes of the main voltage divider and the secondary voltage divider are connected to external detection leads. At least the main voltage divider is a thin film resistor attached to the inner surface of the vacuum housing component.

[0007] The detection lead is sealed and extended from the vacuum housing element.

[0008] In one preferred embodiment of the above overall technical solution, the secondary voltage divider is an external unit resistor connected between the detection lead and the electrode assembly close to the detection lead.

[0009] One preferred embodiment of the above overall technical solution is a film resistor integrally deposited on the inner surface of the vacuum housing element.

[0010] In one preferred embodiment of the above overall technical solution, the thin-film resistor is a uniform-width thin-film resistor that is spirally attached to the inner surface of the vacuum housing element.

[0011] In one preferred embodiment of the above overall technical solution, the thin-film resistor is a squirrel-cage resistor film, which is a strip resistor film with multiple channels spaced apart and connected in parallel between the anode parallel end ring and the cathode parallel end ring. The anode parallel end ring is a conductive end ring electrically connected to the anode assembly; the cathode parallel end ring is a conductive end ring electrically connected to the cathode assembly, and a voltage dividing parallel ring connected in parallel with the strip resistor film is provided at the voltage dividing node.

[0012] In one preferred embodiment of the above overall technical solution, the thin-film resistor is a serpentine coiled resistor film.

[0013] One preferred embodiment of the above overall technical solution further includes a correction compensation resistor, which is externally connected in parallel to the secondary voltage divider.

[0014] In one preferred embodiment of the above overall technical solution, the vacuum housing element is disc-shaped;

[0015] The aforementioned squirrel-cage resistive film is a strip resistive film with multiple radially distributed strips attached to the inner surface of the vacuum housing element disk and connected in parallel between the cathode parallel end ring and the anode parallel end ring.

[0016] In one preferred embodiment of the above overall technical solution, the vacuum housing element is disc-shaped;

[0017] The thin-film resistor is formed by concentric serpentine coils.

[0018] The integrated X-ray tube device technology solution for voltage divider detection provided in this patent application completely changes the composition and configuration connection structure of the external device for voltage divider resistors in X-ray generating devices, integrating it into the X-ray tube device as one unit. This eliminates the need to reserve valuable assembly space for the voltage divider resistors, greatly simplifies the overall composition of the X-ray generating system, reduces system configuration costs, and ensures the working performance and reliable insulation safety performance of the internally integrated voltage divider component due to the vacuum properties of the X-ray tube device itself. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of an external voltage divider resistor connected to an X-ray tube.

[0020] Figure 2 and Figure 9 These are schematic diagrams illustrating the principle structure of combining two types of X-ray tube devices with voltage divider resistors, as described in this patent application.

[0021] Figure 3-8 , Figure 10 These are structural diagrams of various embodiments of this patent application. Detailed Implementation

[0022] The technical content of the voltage divider detection integrated X-ray tube device of this patent application will be described in detail below.

[0023] This voltage divider detection integrated X-ray tube device has a basic structure consisting of a vacuum housing element 7. On this vacuum housing element 7, two coaxially opposite ends form a cathode assembly 11 and an anode assembly 1 corresponding to the cathode assembly 11. Under the influence of a high-voltage electric field between the two assemblies, electrons detach from the cathode filament C and strike the anode target A of the anode assembly at high speed, generating X-rays.

[0024] On the basic structure of the X-ray tube device, a resistor voltage divider is added to the structure of this device.

[0025] The voltage divider section is connected in parallel between the anode assembly 1 and the cathode assembly 11. It is composed of a main voltage divider section R1 and a secondary voltage divider section R2 connected in series. The voltage divider node B of the main voltage divider section R1 and the secondary voltage divider section R2 is connected to a detection lead 8. The detection control circuit at the external instrument end obtains the voltage division value of the secondary voltage divider section R2 through the detection lead 8, and can calculate the total working load voltage between the two poles of the X-ray tube.

[0026] like Figure 9 The diagram shows an X-ray tube device operating under a bipolar power supply with a higher applied operating voltage. In this device, a resistor voltage divider is connected in parallel between the anode A and the cathode C and the intermediate ground: the main voltage divider R1 and the secondary voltage divider R2 on the anode A side, and the main voltage divider R1′ and the secondary voltage divider R2′ on the cathode C side; the voltage divider nodes B and B′ of the two sets of resistor voltage dividers are connected to the detection leads 8 and 8′, and the intermediate node of the two sets of resistor voltage dividers is the grounding point D.

[0027] Among them, at least the main voltage divider R1 is a thin film resistor attached to the inner surface of the vacuum housing element 7; the voltage divider nodes B and B' of the main voltage divider R1, R1′ and the secondary voltage divider R2, R2′ are sealed and led out by the vacuum housing element 7 at corresponding positions and connected to external detection leads 8 and 8′; for the X-ray tube device with bipolar power supply, the intermediate node of the two sets of resistor voltage dividers is the grounding point D, which is also sealed and led out by the vacuum housing element 7 at corresponding positions and connected to the intermediate ground.

[0028] The secondary voltage divider R2 can be either a thin-film resistor attached to the inner surface of the vacuum housing element 7, similar to the main voltage divider R1, or it can be an external resistor unit between the voltage divider node B and the grounding electrode assembly.

[0029] The vacuum housing element 7 can be a glass component, but is most preferably a ceramic component.

[0030] The thin-film resistor can be implemented in various structures.

[0031] Among them, such as Figure 8 The embodiment shown has a film resistor uniformly deposited on the inner surface of the vacuum housing element 7. The film resistor has conductive rings 21, 22, and 23 near the ends of the two-electrode components and at the voltage divider node B. The conductive rings 21 and 22 at both ends extend from the metallized thin film electrical contacts 4 and are short-circuited to the metal Kovar 3 of the electrode components, realizing electrical connection with the anode component 1 and the cathode component 11. The metallized thin film electrical contacts 4 on the conductive ring 23 of the voltage divider node B are short-circuited to the inner end of the detection lead 8 that is sealed and led out of the vacuum housing element 7.

[0032] Another embodiment of the thin-film resistor has the following structure: Figure 3 or Figure 5 As shown, this is a film resistor of equal width that is spirally attached to the inner surface of the vacuum housing element 7. Figure 3 The image shows the fluoroscopic structure of an X-ray tube device with a grounded cathode and a high-voltage applied to the anode. Figure 5 The diagram shows the X-ray tube device with a grounded anode and a negative high voltage applied to the cathode. As shown in the figure, the spiral film resistor is an overall voltage divider resistor. Its two ends and the voltage divider junction B are electrically connected to the inner end of the vacuum housing element 7 of the two poles Kovar 3 and the detection lead 8 via the metallized thin film electrical contact 4.

[0033] Figure 4 The diagram shows a perspective view of the vacuum housing element 7, which is a disc-shaped X-ray tube device. In this embodiment, the thin-film resistor is a uniform-width film resistor connected between two electrodes and spirally attached to the inner surface of the vacuum housing element 7 from the inside out. The outer end of the thin-film resistor, i.e., the outer end of the main voltage divider R1, is electrically connected to the anode via a metallized thin-film electrical contact 4, anode Kovar 3, and metal ball connector 14. The inner end of the thin-film resistor, i.e., the cathode connection end of the secondary voltage divider R, is electrically connected to the external pin 12 of the cathode assembly 11 via a metallized thin-film electrical contact 4. The voltage divider node B is also electrically connected to the detection lead 8 of the sealed vacuum housing element 7 via a metallized thin-film electrical contact 4.

[0034] Another embodiment of the thin-film resistor is a squirrel-cage resistive film attached in a squirrel-cage shape to the inner surface of the cylindrical vacuum housing element 7. The squirrel-cage resistive film, such as... Figure 7As shown, multiple strip resistive films 24 are arranged in parallel between the anode parallel end ring 21 and the cathode parallel end ring 22. The strip resistive films 24 can be arranged with equal or unequal spacing. The anode parallel end ring 21 of the resistive film is a conductive end ring electrically connected to the anode assembly 1, and can be led out to be electrically connected to the Kovar 3 of the anode via the metallized thin film electrical contact 4. The cathode parallel end ring 22 of the resistive film is a conductive end ring electrically connected to the cathode assembly 11, and can be led out to be electrically connected to the Kovar 3 of the cathode via the metallized thin film electrical contact 4. At the voltage dividing node B of the resistive film, there is a voltage dividing parallel ring 23 that connects all the strip resistive films 24 in parallel. The voltage dividing parallel ring 23 is electrically connected to the inner end of the detection lead 8 of the sealed lead-out vacuum housing element 7.

[0035] For X-ray tube devices with a disc-shaped vacuum housing element 7 structure, the squirrel-cage resistive film is a multi-strip resistive film that is attached to the inner surface of the disc of the vacuum housing element 7 and distributed radially. It is connected in parallel between the inner cathode parallel end ring 22 and the outer anode parallel end ring 21, and its electrical connection with the two electrodes and the detection lead 8 is the same as above.

[0036] Figure 6 Another thin-film resistor implementation structure is presented. As shown in the figure, the cylindrical vacuum housing element 7 is divided and unfolded by a virtual longitudinal dividing line NN. A serpentine, laterally coiled resistive film is attached to its inner surface. The currents between adjacent resistive films are opposite to each other to eliminate the side effects of electromagnetic induction and induced current interference of the thin-film resistor. This serpentine coiled resistive film structure can also be applied to X-ray tube devices with a disc-shaped vacuum housing element 7 structure, i.e., the resistive film is formed by concentric serpentine coiling from the inside out.

[0037] To facilitate external adjustment and correction of the voltage divider resistors for accuracy or resistance value, this X-ray tube device is equipped with an external correction and compensation resistor R3, such as... Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the correction compensation resistor R3 is connected in parallel with the secondary voltage divider R2.

[0038] The structure of the above embodiments is also applicable to, for example, Figure 9 The X-ray tube device shown operates on a bipolar power supply. Figure 10The implementation structure of a spirally attached, equal-width film resistor on the inner surface of a vacuum housing element 7 is given. The spiral film resistor is an integral voltage divider resistor, with both ends connected in parallel to Kovar 3 at the two poles via metallized thin-film electrical contacts 4. The midpoint is the intermediate connection point D of the two sets of voltage dividers, which is connected to the intermediate ground. The film resistor between the intermediate connection point D and the anode assembly 1 is the anode-side voltage divider, and the voltage divider junction B of its main voltage divider R1 and secondary voltage divider R2 is sealed and led out by the vacuum housing element 7 and connected to the detection lead 8. The film resistor between the intermediate connection point D and the cathode assembly 11 is the anode-side voltage divider, and the voltage divider junction B' of its main voltage divider R1′ and secondary voltage divider R2′ is sealed and led out by the vacuum housing element 7 and connected to the detection lead 8′.

Claims

1. A voltage divider detection integrated X-ray tube device, comprising a vacuum housing element (7), wherein one end of the vacuum housing element (7) is a cathode assembly (11) and the other end is an anode assembly (1), characterized in that, This device also includes a resistor voltage divider section; The voltage divider is composed of a main voltage divider (R1) and a secondary voltage divider (R2) connected in series and connected in parallel between the cathode assembly (11) and the anode assembly (1). The voltage divider junction (B) of the main voltage divider (R1) and the secondary voltage divider (R2) is connected to an external detection lead (8). At least the main voltage divider (R1) is a thin film resistor attached to the inner surface of the vacuum housing element. The detection lead (8) is sealed and led out by the vacuum housing element.

2. The voltage divider detection integrated X-ray tube device according to claim 1, characterized in that, The X-ray tube device described is an X-ray tube device operating under a bipolar power supply. Its anode assembly (1) and cathode assembly (11) are connected in parallel with the intermediate ground, respectively, with a main voltage divider (R1) and a secondary voltage divider (R2) on the anode side, and a main voltage divider (R1′) and a secondary voltage divider (R2′) on the cathode side. The voltage divider nodes (B, B′) of the two sets of voltage dividers are respectively connected to detection leads (8, 8′), and the intermediate ground between the two sets of voltage dividers is an external grounding point (D).

3. The voltage divider detection integrated X-ray tube device according to claim 1 or 2, characterized in that, The secondary voltage divider is an external resistor unit connected between the detection lead and the electrode assembly close to the detection lead.

4. The voltage dividing detection integrated X-ray tube device according to claim 1, wherein The thin-film resistor is a film resistor integrally deposited on the inner surface of the vacuum housing element.

5. The voltage dividing detection integrated X-ray tube device according to claim 1, wherein The aforementioned thin-film resistor is a uniform-width thin-film resistor that is spirally attached to the inner surface of the vacuum housing element.

6. The voltage dividing detection integrated X-ray tube device according to claim 1, wherein The thin-film resistor is a squirrel-cage resistor film, which is a strip resistor film (24) with multiple channels spaced apart and connected in parallel between the anode parallel end ring (21) and the cathode parallel end ring (22). The anode parallel end ring (21) is a conductive end ring electrically connected to the anode assembly; the cathode parallel end ring (22) is a conductive end ring electrically connected to the cathode assembly; a voltage dividing parallel ring (23) connected in parallel with the strip resistor film is provided at the voltage dividing node (B).

7. The voltage dividing detection integrated X-ray tube device according to claim 1, wherein The thin-film resistor is a serpentine coiled resistor film.

8. The voltage dividing detection integrated X-ray tube device according to claim 1, wherein It also includes a correction compensation resistor (R3), which is externally connected in parallel to the secondary voltage divider (R2).

9. The voltage dividing detection integrated X-ray tube device according to claim 6, wherein The vacuum housing element is disc-shaped; The aforementioned squirrel-cage resistive film is a strip resistive film (24) with multiple radially distributed strips attached to the inner surface of the vacuum housing element disk and connected in parallel between the inner cathode parallel end ring and the outer anode parallel end ring.

10. The voltage dividing detection integrated X-ray tube device according to claim 7, wherein The vacuum housing element is disc-shaped; the thin-film resistor is a concentric serpentine coiled resistive film.

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