Collimator of x-ray imaging device

Abstract

A collimator of an X-ray imaging device is disclosed. The collimator of an X-ray imaging device, provided in an X-ray generation device in order to adjust an X-ray irradiation area, may comprise: a plurality of plates disposed to be overlapped in front of the X-ray generation device; and a driving unit for moving the plates such that the plurality of plates are arranged in parallel in a row so that end lines of side surfaces thereof coincide with an X-ray irradiation angle, or such that the plurality of plates are arranged to be stepped in multiple stages.

Description

collimator of an X-ray machine

[0001] The present invention relates to a collimator of an X-ray photographing device, and more specifically, to a collimator of an X-ray photographing device that can reduce unnecessary X-ray exposure of a patient by improving the accuracy of X-ray irradiation by allowing X-rays irradiated from an X-ray generator to be irradiated to a patient only in an area necessary for examination and blocking X-rays irradiated to an area unnecessary for examination.

[0002] Traditionally, medical professionals such as orthopedists and dentists have used X-ray imaging equipment for diagnosis and treatment decisions. Recent advancements in digital X-ray imaging technology, including digital X-ray detectors, have led to the development of X-ray imaging devices with a wider range of applications.

[0003] In particular, dental X-ray imaging devices are provided so that panoramic images, CT images, and cephalo. images can be taken using a single device. In order to obtain various types of X-ray images, it is necessary to adjust the area where X-rays are irradiated from the X-ray light source, the X-ray irradiation area (FOV, Field Of View), depending on the X-ray image according to the purpose of the shooting.

[0004] In this way, an X-ray collimator is a device that adjusts the irradiation area of ​​X-rays emitted from an X-ray source in an X-ray imaging device. A conventional X-ray collimator arranges a pair of X-ray blocking metal plates parallel to each other in the X-axis direction and the Y-axis direction, and adjusts the gap between each pair of metal plates to adjust the size of the aperture between them, i.e., the aperture through which X-rays can be irradiated.

[0005] However, these conventional collimators have a problem in that even if the irradiation area is set through a blocking metal plate, X-rays are not irradiated only to the irradiation area, but rather a penumbra is created beyond the boundary of the set irradiation area, and as a result, the patient is exposed to unnecessary X-rays as the X-rays are irradiated to unnecessary areas beyond the intended irradiation area.

[0006] To solve these problems, an 'X-ray collimator and an X-ray imaging device using the same (Korean Patent No. 10-2163767)' has been proposed.

[0007] This conventional 'X-ray collimator and X-ray imaging device using the same' is made to reduce the effect of unnecessary interference or partial blocking of X-rays, i.e., the penumbra part in the X-ray image, by changing the edge part of the opening of the collimator that controls the irradiation area of ​​the X-rays from the conventional angled shape to a curved shape. However, there is a problem that it is difficult to completely block X-rays from being irradiated to unnecessary parts beyond the set irradiation area because deviation in the X-ray irradiation area may occur depending on the distance between the subject and the detector.

[0008] The purpose of the present invention is to solve such problems, and to provide a collimator for an X-ray photographing device that can reduce unnecessary X-ray exposure to a patient by irradiating the patient with X-rays from an X-ray generator only to the irradiation area necessary for the examination and blocking X-rays irradiated to an area unnecessary for the examination, thereby improving the accuracy of X-ray irradiation.

[0009] According to one embodiment of the technical idea of ​​the present invention for achieving the above object, a collimator of an X-ray photographing device may include a collimator installed in an X-ray generator to adjust an X-ray irradiation area, a plurality of plates arranged to overlap each other in front of the X-ray generator; and a driving unit that moves the plates so that the end lines of the side surfaces of the plurality of plates are arranged in a row or stepped in multiple stages so as to be aligned with an X-ray irradiation angle.

[0010] Additionally, the above plate may have a plurality of slits formed vertically on one side thereof.

[0011] In addition, the driving unit may include a driving motor installed on the front of the X-ray generator and providing a rotational force; a driving gear coupled to the rotational axis of the driving motor; a driven gear that rotates while meshing with the driving gear; a shaft plate installed on one side of the driving gear and for coupling the rotational axis of the driven gear; and a shaft member that is fixedly installed on the central axis of the driven gear and extends outward from the central axis, and a multi-stage member that is formed to protrude in multiple stages at an end of the shaft member, wherein the multi-stage member is inserted into slits of a plurality of the plates, and the position thereof moves as the driven gear rotates, thereby including an alignment member that moves the positions of the plurality of plates.

[0012] Additionally, two of the above driven gears can be installed on the upper and lower sides of the above driving gear.

[0013] In addition, when the multi-stage member is positioned at a 0° position (first position), the plurality of plates are arranged in a row with the end lines of the sides aligned, and when the multi-stage member is positioned at a 90° position (second position), the plurality of plates are arranged with the end lines of the sides stepped in multiple stages, so that the end lines of the side surfaces of the plurality of plates can be arranged to match the entire area of ​​the X-ray irradiation angle.

[0014] In addition, the above plate may be arranged so that the end lines of the side surfaces are stepped in multiple stages in the opposite direction in which the multi-stage member is positioned at a 90° position (second position) when the multi-stage member is positioned at a -90° position (third position).

[0015] In addition, in a situation where the sum of a plurality of plates has the same thickness, the area of ​​the penumbra portion of the X-ray irradiation area can be gradually reduced as the thickness of each plate decreases and the number of plates increases.

[0016] In addition, the collimator of the X-ray photographing device is configured to form one set module by being composed of one plate and one drive unit, and the set modules are installed in two units on the left and right sides with respect to the X-ray light source irradiated from the X-ray generator, or in four units installed at the left, right, upper, and lower positions with respect to the X-ray light source irradiated from the X-ray generator, so that the plate can be moved in the horizontal X-axis direction and the vertical Y-axis direction to adjust the X-ray irradiation area.

[0017] The collimator of the X-ray photographing device according to the present invention has a plurality of plates arranged in multiple stages corresponding to the direction and angle of the X-rays irradiated from the X-ray generator, thereby blocking the X-rays irradiated to an irradiation area other than the set irradiation area, thereby allowing the X-rays irradiated from the X-ray generator to be irradiated to the patient only in the irradiation area necessary for the examination and blocking the X-rays irradiated to an area unnecessary for the examination, thereby improving the accuracy of the X-ray irradiation, thereby having the effect of reducing unnecessary X-ray exposure to the patient.

[0018] FIG. 1 is a perspective view of a collimator according to one embodiment of the present invention installed in an X-ray generator.

[0019] Figure 2 is an exploded perspective view of a collimator according to one embodiment of the present invention.

[0020] Figures 3 and 4 are operating state diagrams showing the state in which the multi-stage member is positioned in the first position.

[0021] Figures 5 and 6 are operating state diagrams showing the state in which the multi-stage member is positioned in the second position.

[0022] Figures 7 and 8 are operating state diagrams showing the state in which the multi-stage member is positioned at the second and third positions.

[0023] Figure 9 is a plan view of a plate with a reduced thickness and an increased number of plates.

[0024] FIG. 10 is a front view of a collimator according to another embodiment of the present invention installed in an X-ray generator comprising four set modules.

[0025] In order to fully understand the present invention, its operational advantages, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the drawings, which illustrate preferred embodiments of the present invention.

[0026] Hereinafter, the present invention will be described in detail by describing preferred embodiments thereof with reference to the attached drawings. The same reference numerals in each drawing represent the same components.

[0027] The collimator of the X-ray photographing device of the present invention relates to a collimator of the X-ray photographing device that can reduce unnecessary X-ray exposure of a patient by improving the accuracy of X-ray irradiation by irradiating the patient with X-rays irradiated from the X-ray generating device only to the irradiation area necessary for the examination and blocking X-rays irradiated to an area unnecessary for the examination.

[0028] FIG. 1 is a perspective view of a collimator according to one embodiment of the present invention installed in an X-ray generator, and FIG. 2 is an exploded perspective view of a collimator according to one embodiment of the present invention.

[0029] Referring to FIGS. 1 and 2, a collimator (10, hereinafter referred to as “collimator”) of an X-ray imaging device according to one embodiment of the present invention may largely include a plate (100) and a driving unit (200).

[0030] Typically, an X-ray imaging device (1) is a device that irradiates X-rays toward a patient for diagnosis or treatment method determination in orthopedics or dentistry, and detects and reads the X-rays passing through the patient through a detector.

[0031] At this time, a collimator is essential to adjust the irradiation area of ​​the X-rays emitted from the light source output from the light source unit (2) where the X-rays are irradiated in the X-ray imaging device (1).

[0032] The present invention relates to such a collimator, and relates to a collimator (10) for irradiating a patient with X-rays irradiated from an X-ray generator (1) only to an irradiation area necessary for examination and blocking X-rays irradiated to an area unnecessary for examination.

[0033] Meanwhile, in explaining the present invention, the term 'X-ray irradiation angle' refers to an angle at which X-rays are irradiated so that X-rays are irradiated corresponding to the area to be irradiated to the patient.

[0034] First, a plurality of plates (100) can be placed in an overlapping manner on the front of the X-ray generator (1).

[0035] The above plates (100) are provided in multiple overlapping configurations and have a square flat plate-shaped structure. At this time, a slit (110) may be formed in the form of a vertical hole on each side.

[0036] The above plate (100) substantially acts as a blocking film to allow the necessary portion of the X-rays irradiated from the light source (2) to pass through and to block the unnecessary portions to a limited extent, and is preferably made of a metal material that is easy to block X-rays.

[0037] In this way, since the above plates (100) are provided in multiple numbers, each side end line is arranged in multiple steps, so that unnecessary parts can be efficiently blocked in response to the direction and angle of X-ray irradiation radiated from the light source unit (2).

[0038] Next, the driving unit (200) is a part that moves the plates (100) so that the end lines of the sides of the plates (100) are arranged in a row or in multiple stages so that they are aligned with the X-ray irradiation angle.

[0039] The above driving unit (200) may include a driving motor (210) that is installed on the front of the X-ray generator (1) and provides rotational force, a driving gear (220) that is axially coupled to the rotational axis of the driving motor (210), a driven gear (230) that rotates while meshing with the driving gear (220), and a shaft plate (240) that is installed on one side of the driving gear (220) and to which the rotational axis of the driven gear (230) is axially coupled.

[0040] In addition, it may include an alignment member (250) that is fixedly installed on the central axis of the driven gear (230) and extends outward from the central axis, and a multi-stage member (252) that is formed to protrude in multiple stages at the end of the driven gear (251), and the multi-stage member (252) is inserted into a slit (110) of a plurality of the plates (100), so that the position moves as the driven gear (230) rotates, thereby moving the positions of the plurality of plates (100).

[0041] The above driving motor (210) can be driven by receiving power from the X-ray generator (1) as a conventional motor.

[0042] The above driving gear (220) is a part that is axially coupled to the rotation axis of the driving motor (210) and rotates by the operation of the driving motor (210), and can be formed in the form of a conventional spur gear.

[0043] The above driven gear (230) is a gear that rotates while meshing with the drive gear (220), is placed on one side of the drive gear (220), and rotates together with the rotation of the drive gear (220), and can be formed in the form of a normal spur gear.

[0044] At this time, the driven gear (230) can be installed so that two of them mesh with each other on the upper and lower sides of the driving gear (220).

[0045] Meanwhile, as an example, the gear ratio of the driving gear (220) and the driven gear (230) may be 1:2.

[0046] Accordingly, when the driving gear (220) rotates twice, the driven gear (230) rotates once, and as the driving gear (220) rotates, the driven gears (230) arranged on the upper and lower sides rotate in opposite directions to the driving gear (220), and the two driven gears (230) arranged on the upper and lower sides rotate in the same direction.

[0047] The above-mentioned shaft plate (240) is installed on the front of the driving motor (210), and has an shaft hole (241) formed corresponding to the position of the rotational axis of the driven gear (230) for inserting a rotational axis, and is a part for supporting the driven gear (230) in an axially coupled state.

[0048] The above alignment member (250) is a part that receives rotational force through the driving motor (210) to rotate the driving gear (220) and thereby rotate the driven gear (230), thereby arranging a plurality of the plates (100) in a row with their side edges aligned or moving the plates (100) so that their side edges are arranged in multiple steps.

[0049] The above alignment member (250) may include an axis member (251) and a multi-stage member (252).

[0050] The above shaft member (251) is fixedly installed on the central axis of the driven gear (230) and extends in length from the central axis to the outside, so that the plate (100) can be extended in length so that it is driven to match the irradiation angle of the X-ray.

[0051] The above multi-stage member (252) is a part formed to protrude in multiple stages from the end of the shaft member (251), and can be formed so that steps are formed corresponding to the number of the plurality of plates (100).

[0052] That is, the multi-stage member (252) may be formed with steps such that each step corresponds to the thickness of the plate (100), that is, each step may have a length that allows it to be inserted and positioned in the slit (110).

[0053] In addition, the thickness of each stage of the multi-stage member (252), i.e., the outer diameter, can be set by taking into account the operating distance of each plate (100) so that the plurality of plates (100) are stepped in multiple stages to match the X-ray irradiation angle.

[0054] In addition, the multi-stage member (252) may be formed in a form in which the end lines on both sides of the outer surface are in a straight line or are staggered in multiple steps depending on the direction in which each step is formed when viewed from above.

[0055] Accordingly, when the multi-stage member (252) is positioned so that the ends on both sides of the outer surface are in a straight line while being inserted into the slit (110) of the plate (100), a plurality of the plates (100) can be aligned with the ends on both sides in a straight line.

[0056] In addition, when the multi-stage member (252) is positioned so that the ends on both sides of the outer circumference are stepped in multiple stages while being inserted into the slit (110) of the plate (100), a plurality of the plates (100) can be arranged so that the ends on both sides are stepped in multiple stages.

[0057] That is, through the multi-stage member (252), a plurality of the plates (100) can be aligned to match the irradiation angle at which the X-rays are irradiated.

[0058] At this time, the plate (100) can form an inclination angle in a more detailed stepwise manner by increasing the number of plates as shown in FIG. 9, thereby minimizing the penumbra area so that only the necessary irradiation area for the patient is irradiated with X-rays.

[0059] Below, the operation of the collimator (10) is described in detail.

[0060] Hereinafter, when explaining the position and angle of the multi-stage member (252), when they are arranged oppositely on both sides or upper and lower sides with respect to the light source unit (2), the angles and positions in opposite directions may mean the same angle and position, and the opposing multi-stage members (252) are explained as meaning the same rotation angle by assuming that they rotate in opposite directions.

[0061] For example, a state in which a multi-stage member (252) at one position is rotated 90° in one direction from a 0° state with respect to a light source unit (2) and a state in which a multi-stage member (252) at the other position is rotated 90° in the other direction from a 0° state may mean a second position in a 90° rotation state with the same rotation angle.

[0062] Figures 3 and 4 are operating state diagrams showing the state in which the multi-stage member is positioned at the first position, Figures 5 and 6 are operating state diagrams showing the state in which the multi-stage member is positioned at the second position, and Figures 7 and 8 are operating state diagrams showing the state in which the multi-stage member is positioned at the second and third positions.

[0063] Referring to FIGS. 3 and 4, when the multi-stage member (252) is positioned at the 0° position (first position), the plate (100) can be arranged in a row with multiple end lines aligned on the side.

[0064] That is, when the multi-stage member (252) is positioned at the top or bottom center position of the driven gear (230) by moving together as the two driven gears (230) rotate, the first position is referred to as the 0° position, and when positioned at the first position, the plurality of plates (100) are horizontally moved while inserted into the slit (110), and the end lines on both sides of the outer surface of the multi-stage member (252) form a straight line, so that the end lines of the plurality of plates (100) are aligned in a row.

[0065] At this time, the plurality of plates (100) are in a straight line with their ends facing each other, so that the X-rays emitted from the light source (2) can be completely blocked.

[0066] In addition, although not shown in the drawing, the area of ​​the plate (100) may be made small so that the ends of both sides of the plate (100) form a straight line while allowing some X-rays to pass through, thereby allowing X-rays to be irradiated in a straight line.

[0067] In this way, when the multi-stage member (252) is positioned at the center positions of the uppermost and lowermost ends of two driven gears (230) and is vertically arranged in a row, the ends of both sides of the plurality of plates (100) are completely aligned to form a flat side surface.

[0068] At this time, the multi-stage member (252) is fixed to the driven gear (230) and rotates together, and as the position changes due to the rotational movement, the plurality of plates (100) inserted into the slit (110) are moved horizontally by a linear movement.

[0069] Referring to FIGS. 5 and 6, when the multi-stage member (252) is rotated from the 0° position (first position) to the 90° position (second position), a plurality of the end lines of the side surfaces can be arranged in a multi-stage manner.

[0070] That is, when the multi-stage member (252) is positioned at a 90° position and rotated 90° in one direction and the other direction from the uppermost or lowermost center position of the driven gear (230) while the two driven gears (230) are positioned at a 0° position (first position), and is positioned at a second position, the multi-stage member (252) moves the plurality of plates (100) horizontally while being inserted into the slit (110), and the end lines on both sides of the outer circumferential surface of the multi-stage member (252) are misaligned in multiple steps, so that the end lines of both sides can be arranged in multiple steps.

[0071] At this time, the plurality of plates (100) can be set to correspond to the irradiation angle and direction of the X-rays radially irradiated from the light source unit (2) by having the ends on both sides stepped in multiple stages.

[0072] In this way, when the multi-stage member (252) is positioned at the left or right side of the two driven gears (230), the ends of the multiple plates (100) on both sides can be arranged so that the multiple plates (100) are misaligned by the step of the multi-stage member (252).

[0073] At this time, the multi-stage member (252) is fixed to the driven gear (230) and rotates together, and as the position changes due to the rotational movement, the plurality of plates (100) inserted into the slit (110) are moved horizontally by a linear movement.

[0074] Referring to FIGS. 7 and 8, when the multi-stage member (252) is rotated from a position at a 0° position (first position) to a position at a -90° position (third position), a plurality of the side ends can be arranged in a multi-stage manner in the opposite direction in which the multi-stage member is positioned at a 90° position (second position) so that the side ends are arranged in a multi-stage manner.

[0075] That is, when the multi-stage member (252) is positioned at a -90° position, which is a third position, when the two driven gears (230) are rotated from the top or bottom center position of the driven gears (230) at a 0° position (first position) and rotated -90° in one direction and the other direction, the multi-stage member (252) is positioned at the -90° position, and when positioned at the third position, the plurality of plates (100) are horizontally moved while inserted into the slit (110), and the end lines on both sides of the outer peripheral surface of the multi-stage member (252) are misaligned in multiple steps opposite to the second position, so that the end lines on both sides of the multi-stage member (252) can be arranged in multiple steps.

[0076] At this time, the plurality of plates (100) can be set to correspond to the irradiation angle and direction of the X-rays irradiated from the light source unit (2) by having the ends on both sides stepped in multiple stages.

[0077] In this way, when the multi-stage member (252) is positioned at the left or right side of the two driven gears (230), the ends of the multiple plates (100) on both sides can be arranged so that the multiple plates (100) are misaligned by the step of the multi-stage member (252).

[0078] At this time, the multi-stage member (252) is fixed to the driven gear (230) and rotates together, and as the position changes due to the rotational movement, the plurality of plates (100) inserted into the slit (110) are moved horizontally by a linear movement.

[0079] For example, as shown in FIGS. 7 and 8, in a case where it is desired to selectively irradiate X-rays to one side rather than irradiating X-rays in the center based on the position where the X-ray generator (1) is installed, the multi-stage member (252) on one side can be set to the third position and the multi-stage member (252) on the other side can be set to the second position based on the light source unit (2).

[0080] In this case, the drive motors (210) arranged on both sides are operated to rotate in the same direction, so that the drive gear (220) rotates in the same direction, and the plurality of plates (100) are arranged out of alignment, thereby preventing the X-rays from being irradiated to a position that is offset from the center position of the light source unit (2).

[0081] Meanwhile, when the multi-stage member (252) is rotated from 0° to 90° or -90°, a plurality of plates (100) can be arranged in a row with the end lines of the sides aligned, and then gradually arranged in multi-stage steps with the end lines of the sides aligned, when the multi-stage member (252) is rotated from 0° to 90° or from 0° to -90°.

[0082] That is, when rotated from 0° to 90° or from 0° to -90°, the width of the step gradually increases and can be arranged to match the irradiation angle of the X-ray.

[0083] In this way, the plurality of plates (100) are driven separately according to the rotation change of the driven gear (230), but the rotation radius is aligned by position so that the X-ray blocking surfaces of the plurality of plates (100) can be arranged in multiple stages to match the X-ray irradiation angle.

[0084] Meanwhile, the plate (100) slides in a linear motion by the rotation of the driven gear (230) while the multi-stage member (252) is inserted into the slit (110). However, although not shown in the drawing, a guide (not shown) may be further provided to stably support the plate (100) without shaking and allow it to slide.

[0085] Figure 9 is a plan view of a plate with a reduced thickness and an increased number of plates.

[0086] Referring to FIG. 9, in a situation where the thickness of multiple plates (100) is the same, the area of ​​the penumbra portion of the X-ray irradiation area can be gradually reduced as the thickness of each plate (100) decreases and the number of plates increases.

[0087] That is, when configuring a plurality of plates (100), the effect of reducing the penumbra area can be obtained by increasing the number of plates with the same thickness compared to configuring with a smaller number.

[0088] FIG. 10 is a front view of a collimator according to another embodiment of the present invention installed in an X-ray generator comprising four set modules.

[0089] Referring to FIG. 10, the collimator (10) of the present invention can be configured by one plate (100) and one driving unit (200) to form one set module (S).

[0090] At this time, the set module (S) may be installed in two units on the left and right sides with respect to the X-ray light source irradiated from the X-ray generator (1) as in the embodiment described above, or, as another embodiment, as shown in FIG. 10, four units may be installed in the left, right, upper, and lower positions with respect to the X-ray light source irradiated from the X-ray generator (1), so that the plate (100) may be moved in the horizontal X-axis direction and the vertical Y-axis direction to adjust the X-ray irradiation area.

[0091] That is, the plate (100) is moved in the horizontal X-axis direction and the vertical Y-axis direction so that the plates (100) partially overlap each other, thereby narrowing or widening the size of the opening area.

[0092] The collimator of the X-ray photographing device according to the technical idea of ​​the present invention has a plurality of plates arranged in multiple stages corresponding to the direction and angle of the X-rays irradiated from the X-ray generator, thereby blocking the X-rays irradiated to an irradiation area other than the set irradiation area, thereby irradiating the patient with the X-rays irradiated from the X-ray generator only to the irradiation area necessary for the examination and blocking the X-rays irradiated to an area unnecessary for the examination, thereby improving the accuracy of the X-ray irradiation, thereby having the effect of reducing unnecessary X-ray exposure to the patient.

[0093] As described above, the best practice embodiments have been disclosed in the drawings and specifications. While specific terms have been used herein, they are used solely for the purpose of describing the present invention and are not intended to limit the meaning or scope of the invention as defined in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent embodiments are possible. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

[0094] The present invention is implemented as a collimator of an X-ray photographing device that can reduce unnecessary X-ray exposure to a patient by irradiating the patient with X-rays from an X-ray generating device only to the irradiation area necessary for the examination and blocking X-rays irradiated to an area unnecessary for the examination, thereby improving the accuracy of X-ray irradiation, but can be applied to various industrial fields within the scope of the configuration of the present invention.

Claims

1. In a collimator installed in an X-ray generator to adjust the X-ray irradiation area, A plurality of plates are arranged in an overlapping manner in front of the X-ray generator; and A collimator of an X-ray imaging device, comprising a driving unit for moving the plates so that the end lines of the sides of the plurality of plates are aligned with the X-ray irradiation angle.

2. In paragraph 1, The above plate, A collimator of an X-ray imaging device characterized in that a plurality of slits are formed vertically on one side of each.

3. In paragraph 2, The above driving part, A drive motor installed on the front of the X-ray generator and providing rotational force; A driving gear coupled to the rotational axis of the above driving motor; A driven gear that rotates in mesh with the above driving gear; A shaft plate installed on one side of the above driving gear and for connecting the rotational axis of the driven gear; and A collimator of an X-ray photographing device, characterized in that it includes a shaft member fixedly installed on the central axis of the driven gear and extending in length from the central axis to the outside, and a multi-stage member formed to protrude in multiple stages at an end of the shaft member, and an alignment member in which the multi-stage member is inserted into a slit of a plurality of the plates, and the position is moved as the driven gear rotates, thereby moving the positions of the plurality of plates.

4. In paragraph 3, The above driven gear is, A collimator of an X-ray imaging device, characterized in that two are installed on the upper and lower sides of the above driving gear.

5. In paragraph 3, The above plate, When the above multi-stage member is positioned at the 0° position (first position), a plurality of members are arranged in a row with the end lines of the sides aligned, When the above multi-stage member is positioned at a 90° position (second position), multiple members are arranged with the end lines of the sides stepped in multiple stages. A collimator of an X-ray photographing device, characterized in that the end lines of the side surfaces of a plurality of the above plates are arranged to match the entire area of the X-ray irradiation angle.

6. In paragraph 3, The above plate, A collimator of an X-ray photographing device characterized in that, in a situation where the thickness of a plurality of plates is the same, the area of the penumbra portion of the X-ray irradiation area can be gradually reduced as the thickness of each plate decreases and the number increases.

7. In paragraph 3, The collimator of the above X-ray imaging device is The above plate and the above driving part are each configured to form one set module, The above set module is, Two are installed on the left and right side of the X-ray light source irradiated by the X-ray generator, or Four are installed at the left, right, upper, and lower positions based on the X-ray light source irradiated by the X-ray generator. A collimator of an X-ray imaging device characterized in that the plate is configured to move in the horizontal X-axis direction and the vertical Y-axis direction to adjust the X-ray irradiation area.

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