KR20230058017A - Rotation limiting device and radiology apparatus with the same - Google Patents

Abstract

According to one embodiment of the present invention, a rotation limiting device includes: a base portion having a shaft and a rotating ring rotatably coupled to an outer periphery of the shaft; a fixed disk fixedly installed on the shaft; and a rotating disk interposed between the rotating ring and the fixed disk and rotatably coupled to the outer periphery of the shaft. Disclosed is a rotation limiting device configured to limit a rotation range of the rotating ring with respect to the shaft and a radiography device equipped the same. Accordingly, an entire size of the radiography device can be reduced.

Description

Rotation limiting device and radiation imaging device having the same {Rotation limiting device and radiology apparatus with the same}

The present invention relates to a radiographic imaging apparatus, and more particularly, to a rotation limiting device for limiting a rotation angle range of a rotary arm in the radiographic imaging apparatus and a radiographic imaging apparatus having the same.

A radiation imaging device in the field of dentistry takes X-rays while rotating the radiation source and the detection sensor at the same time while arranging a radiation (eg, X-ray) emitter and a radiation detection sensor to face each other with the subject, that is, the patient's head, interposed therebetween. A 3D X-ray image of the region to be photographed is generated by reconstructing the photographing result.

In general, a dental radiographic apparatus captures a computed tomography (CT) image and a panoramic image. CT scanning is a technique of obtaining a 3D X-ray image of the target while rotating the target by 360 degrees, and it can accurately and clearly display tomographic images according to the location and direction desired by the user, which is why high precision is required, such as implant surgery. being used in the field. However, a general X-ray CT image has a disadvantage in that the amount of radiation irradiated to the subject is relatively high and an expensive large-area X-ray sensor is required.

In the X-ray panoramic image, the radiation source and the radiation sensor are placed facing each other along the arch of the target, that is, the subject's arch, and then X-rays are taken while rotating, and the results of these scans are connected to form a desired focus layer within the trajectory of the arch. The arrangement relationship of the teeth and surrounding tissues is spread out and displayed like a panorama.

For such CT imaging and panoramic imaging, radiography is performed while a rotary arm to which a radiation (X-ray) generator and a radiation detector are attached rotates more than 360 degrees around a patient's face. However, in order for the rotary arm to rotate more than 360 degrees with respect to the frame of the radiographic apparatus and return to the original position, the shaft, the rotation driving means for rotatably supporting the rotary arm, and the rotary arm are rotated to the maximum rotatable angle, and then further Several components, such as a rotation limiter that restricts rotation so that it does not occur, are required, which increases the volume of the device.

Patent Document 1: Korean Patent Publication No. 2010-0126658 (published on December 2, 2010) Patent Document 2: Korean Patent Publication No. 2009-0054447 (published on May 29, 2009)

The present invention has been made to solve the problems of the prior art, and limits the rotation angle so that the rotary arm of the radiographic apparatus does not rotate more than the maximum rotation angle, but has a compact structure, thereby reducing the volume of the device. and to provide a radiography apparatus having the same.

According to one embodiment of the present invention, a rotation limiting device, comprising: a base portion having a shaft and a rotating ring rotatably coupled to an outer circumference of the shaft; a fixed disk fixed to the shaft; And a rotating disk interposed between the rotating ring and the fixed disk and rotatably coupled to the outer circumference of the shaft; including, a rotation limiting device configured to limit the rotation range of the rotating ring with respect to the shaft and having the same The radiographic apparatus is started.

When the rotation limiting device according to an embodiment of the present invention is applied to a radiographic apparatus, the rotation limiting device prevents the rotary arm from rotating beyond the maximum rotation angle, thereby preventing damage to equipment such as a shaft or rotation driving means. .

In addition, according to an embodiment of the present invention, since the rotation limiting device is configured in the form of stacking a base portion, a rotating disk, and a fixed disk, the rotation limiting device can be miniaturized, thereby reducing the size of the entire radiographic apparatus. .

1 is a perspective view of a dental radiographic apparatus equipped with a rotation limiting device according to an embodiment of the present invention;
2 is a perspective view of a rotation limiting device according to an embodiment;
3 and 4 are exploded perspective views of the rotation limiting device according to an embodiment viewed from different angles;
5 and 6 are views of the rotation limiting device and the rotation panel attached thereto from different angles according to an embodiment;
7 is a view showing a state in which the rotation panel attached to the rotation limiting device rotates in an initial position;
8 is a view showing a state in which the rotation panel attached to the rotation limiting device returns to the initial position;
9 is a flowchart illustrating a method of detecting rotation of a rotating panel according to an exemplary embodiment.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Embodiments described below are exemplary embodiments provided to sufficiently convey the spirit of the present invention to those skilled in the art.

In this specification, when an element (A) is referred to as being “above” (or “below,” “right,” or “left”) of another element (B), it refers to that of the other element (B). It means that it can be positioned directly above (or below, right, or left) or a third component (C) may be interposed therebetween. In addition, the lengths or thicknesses of components in the drawings are exaggerated for effective description of technical content.

In this specification, coupling, attaching, fastening, or connecting a component (A) to another component (B) means not only directly to the component (A) and component (B), but also to the other component (C). Indirect coupling, attachment, fastening, or connection through intervening may also be included.

In addition, expressions such as 'upper', 'lower', 'left', 'right', 'front', 'rear', etc. used to describe the positional relationship between components in this specification mean a direction or position as an absolute standard. However, when the present invention is described with reference to each drawing, it may be a relative expression used for convenience of description based on the drawing.

In this specification, when terms such as first and second are used to describe components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. Expressions such as 'including', 'consisting of', and 'consisting of' used in this specification do not exclude the presence or addition of other elements other than the elements mentioned in these expressions.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, several specific contents are prepared to more specifically describe the invention and aid understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known in describing the invention and are not greatly related to the invention are not described in order to prevent confusion in describing the present invention.

1 is a perspective view of a dental radiography apparatus in which a rotation limiting device according to an embodiment of the present invention is installed. Referring to FIG. 1 , a radiation imaging apparatus according to an embodiment includes a main frame 10, a vertical movement frame 30, a support frame 40, a rotary arm 60, a radiation generator 71, and a radiation detector ( 72), etc.

The main frame 10 is supported vertically by the pedestal 20, and the vertical movement frame 30 is coupled to the main frame 10 to be movable in the vertical direction. The support frame 40 and the subject support part 45 extend side by side in the horizontal direction on the upper and lower portions of the vertical movement frame 30, respectively.

The support frame 40 is a member that supports the rotary arm 60 . The rotary arm 60 may be rotatably installed while maintaining a horizontal position with respect to the support frame 40 . In the illustrated embodiment, the rotation limiting device 100 and the rotation panel 200 rotatably coupled thereto are interposed between the support frame 40 and the rotary arm 60. For example, the shaft (111 in FIG. 2) of the rotation limiting device 100 is attached to and fixed to the support frame 40, and the rotating panel 200 is the rotating ring (112 in FIG. 2) of the rotation limiting device 100. attached to and fixed. In addition, the rotary panel 200 is also attached and fixed to the rotary arm 60, and thus the rotary arm 60 is rotatable to the support frame 40 via the rotation limiting device 100 and the rotary panel 200 can be conjoined.

The rotary arm 60 includes a radiation generator 71 and a radiation detector 72 disposed to face each other with a subject (for example, a dental patient's face) interposed therebetween. For example, both ends of the rotary arm 60 extend vertically downward to form a first vertical portion 61 and a second vertical portion 62, respectively, and a radiation generator 71 is formed on the first vertical portion 61. ) may be installed and the radiation detector 72 may be installed on the second vertical portion 62. In one embodiment, radiation generator 71 is an X-ray generator and radiation detector 72 is an X-ray detector.

The subject support part 45 protrudes horizontally from the lower part of the vertical movement frame 30 and is positioned vertically below the support frame 40 . A chin rest 46 may be installed at an end of the subject support unit 45 to support the chin of the subject, the patient.

In this configuration, for example, X-rays are taken while rotating the rotary arm 60 by 360 degrees or more in a state where the patient puts his chin on the chin rest 46 and places his face on the subject support 45, thereby capturing the oral cavity of the patient. X-ray images can be taken.

Hereinafter, the rotation limiting device 100 will be described in detail with reference to FIGS. 2 to 4 .

2 is a perspective view of the rotation limiting device 100 according to an embodiment of the present invention, and FIGS. 3 and 4 are exploded perspective views of the rotation limiting device 100 viewed from different angles. 2 to 4, the rotation limiting device 100 according to an embodiment includes a base part 110, a rotating disk 120, and a fixed disk 130. When actually installed in the radiographic apparatus, as shown in FIG. 1, the base portion 110, the rotating disk 120, and the fixed disk 130 are sequentially stacked from top to bottom in order, and the shaft of the base portion 110 ( 111) may be coupled to and fixed to the support frame 40. However, in the following drawings, the fixed disk 130, the rotating disk 120, and the base part 110 are sequentially shown in order from top to bottom for convenience of description of the invention, and based on this arrangement order, “top” and Let's define "below".

In one embodiment, the base part 110 may include a shaft 111 and a rotating ring 112 rotatably attached to an outer circumferential surface thereof. The shaft 111 may have a cylindrical or cylindrical shape with a predetermined height and diameter. The rotating ring 112 may be a ring-shaped member rotatably attached to the circumference of the shaft 111 . In one embodiment, a bearing is interposed and installed between the shaft 111 and the rotary ring 112 so that the rotary ring 112 can rotate about the axis of the shaft 111 . The rotating ring 112 may include a first stopper 115 installed on an upper surface to protrude upward.

The fixed disk 130 is a member fixed to the shaft 111 of the base part 110. In one embodiment, the fixed disk 130 may be blocked at the center or may have a disk shape with a through hole formed in the center as shown. In the illustrated embodiment, the fixed disk 130 is coupled to the top of the shaft 111. However, it does not necessarily need to be coupled to the upper end of the shaft 111, and for example, the fixed disk 130 may be installed at a middle height of the shaft 111.

The diameter of the fixed disk 130 is greater than the diameter of the shaft 111. The fixed disk 130 may include a second stopper 135 installed to protrude downward on the lower surface. In the illustrated embodiment, the distance to the first stopper 115 and the distance to the second stopper 135 are configured differently based on the central axis of the shaft 111. For example, in the illustrated embodiment, the distance from the central axis of the shaft 111 to the first stopper 115 is greater than the distance to the second stopper 135. However, in an alternative embodiment, the distance to the first stopper 115 based on the central axis of the shaft 111 may be smaller than the distance to the second stopper 135, or the two distances may be the same. For example, when the thickness of the rotating disk 120 is thick, the two distances may be the same.

The fixed disk 130 has a side portion 131 facing radially outward. Although not shown in the drawing, a structure such as a gear or a screw thread that can be engaged with a power transmission means such as a belt or chain may be formed along the circumference of the fixed disk 130 on the side portion 131, and accordingly, such a belt or chain Power transmission means such as may be connected to the side portion 131 of the fixed disk 130.

The fixed disk 130 may further include a first sensing plate P1 protruding radially from the central axis. In the illustrated embodiment, the first sensing plate P1 has a fan shape, but this is exemplary and the shape or size of the first sensing plate P1 may vary according to specific embodiments of the invention.

The rotating disk 120 is a ring-shaped member with a through hole formed in the center, and is interposed between the rotating ring 112 and the fixed disk 130 and is rotatably coupled to the outer circumferential surface of the shaft 111 and installed. The rotating disk 120 may include a second sensing plate P2 attached to protrude radially from the central axis. In the illustrated embodiment, the second sensing plate P2 has a fan shape, but this is exemplary and the shape or size of the second sensing plate P2 may vary according to specific embodiments of the invention.

The rotating disk 120 includes an upper guide groove 121 formed on an annular upper surface and a lower guide groove 122 formed on a lower surface. The upper guide groove 121 is formed along the annular upper surface of the rotating disk 120 to a length of a predetermined arc. For example, in the illustrated embodiment, the upper guide groove 121 spans the arc length excluding the arc for installation of the second sensing plate P2, that is, the arc length from the first end 121a to the second end 121b. It may be formed on the upper surface of the rotating disk 120. For example, in the illustrated embodiment, the upper guide groove 121 may be formed along an arc of a sector having a center angle of approximately 300 degrees of the rotating disk 120 .

The lower guide groove 122 is formed along the annular lower surface of the rotating disk 120 to a length of a predetermined arc. For example, as shown in FIG. 4, the lower guide groove 122 is at least part of the length of an arc for installing the second sensing plate P2, that is, an arc extending from the first end 122a to the second end 122b. It may be formed on the lower surface of the rotating disk 120 over its length. For example, in the embodiment shown in FIG. 4 , the lower guide groove 122 is formed on the lower surface of the rotary disk 120 along the circular arc of a sector with a center angle of about 200 degrees. However, it will be understood that each length of the upper guide groove 121 and the lower guide groove 122 is exemplary.

In the illustrated embodiment, the distance to the upper guide groove 121 and the distance to the lower guide groove 122 are different based on the central axis of the rotating disk 120. For example, in the illustrated embodiment, the distance from the central axis of the rotating disk 120 to the lower guide groove 122 is greater than the distance to the upper guide groove 121. However, in an alternative embodiment, the distance to the upper guide groove 121 based on the central axis of the rotating disk 120 may be greater than the distance to the lower guide groove 122, and also if the thickness of the rotating disk 120 If is thick, it will be understood that it is okay to design the distance to the upper guide groove 121 and the distance to the lower guide groove 122 to be the same.

In a preferred embodiment, in a state in which the base part 110, the rotating disk 120, and the fixed disk 130 are fastened and manufactured as shown in FIG. 2, the first stopper 115 on the top of the rotating ring 112 is It is arranged to be accommodated in the lower guide groove 122 of the rotating disk 120, and the second stopper 135 at the bottom of the fixed disk 130 is arranged to be accommodated in the upper guide groove 121 of the rotating disk 120. Therefore, as can be seen in FIGS. 3 and 4, when the rotating disk 120 is closely coupled to the rotating ring 112, the first stopper 115 is removed from the first end 122a of the lower guide groove 122. Up to the second end 122b, the rotating ring 112 and the rotating disk 120 can rotate relative to each other. In addition, when the rotating disk 120 is closely coupled to the fixed disk 130, the second stopper 135 extends from the first end 121a to the second end 121b of the upper guide groove 121, It will be appreciated that the rotating ring 112 can rotate relative to the stationary disk 130 .

By this configuration, the rotation limiting device 100 can limit the rotation range of the rotation ring 112 with respect to the shaft 111. Specifically, the rotating ring 112 rotates with respect to the rotating disk 120 within a first rotational angle range of less than 360 degrees, and the rotating disk 120 with respect to the fixed disk 130 rotates within a second rotational angle of less than 360 degrees. It can be configured to rotate within a range, and thus the rotating ring 112 can rotate with respect to the shaft 111 within a rotation angle range that is the sum of the first rotation angle and the second rotation angle.

For example, in the case of the embodiments of FIGS. 3 and 4, for example, when the lower guide groove 122 of the rotating disk 120 is formed along the circular arc of a sector with a central angle of about 270 degrees, the first stopper of the rotating ring 112 ( 115) moves from the first end 122a to the second end 122b of the lower guide groove 122 in a counterclockwise direction with respect to the rotary disk 120 (that is, “A” in FIG. 3). direction) can rotate 200 degrees. In addition, for example, when the upper guide groove 121 of the rotating disk 120 is formed along the circular arc of a sector with a central angle of about 330 degrees, the second stopper 135 of the fixed disk 130 is the first of the upper guide groove 121. From the end 121a to the second end 121b, the rotating ring 112 can rotate 300 degrees counterclockwise (direction “A”) with respect to the fixed disk 130. At this time, since the rotary ring 112 rotates with the rotary ring 112 when it rotates with respect to the fixed disk 130, it is understood that as a result, the rotary ring 112 can rotate within a rotation angle range of up to 500 degrees. will be.

5 and 6 schematically show a state in which the rotation panel 200 is attached to the rotation limiting device 100 according to an embodiment. The rotation limiting device 100 according to the present invention is a first member fixedly attached to the shaft 111 (hereinafter referred to as a 'fixed member') and a second member fixedly attached to the rotary ring 112 (hereinafter referred to as a 'rotating member'). Also referred to as) so that the second member (rotating member) can be rotated relative to the first member (fixed member) by mediating between them. 5 and 6, the rotation panel 200 is integrally coupled to the rotation ring 112 of the rotation limiting device 100. In one embodiment, the rotating panel 200 may be a part of the rotary arm 60 shown in FIG. 1 or integrally coupled to the rotary arm 60 . The shaft 111 may be fixed to the support frame 40 of FIG. 1 . That is, in the embodiments of FIGS. 5 and 6, the support frame 40 is a fixed member and the rotating panel 200 is a rotating member, so the rotary arm 60 via the rotation limiting device 100 is a support frame ( 40) can be rotated relative to

A mechanism for rotating the rotating panel 200 may be implemented in various ways according to specific embodiments of the present invention. As an embodiment, although not shown in the drawings, a rotation drive source such as a drive motor is fixedly installed on the rotation panel 200, and a drive shaft of the rotation drive source is a side portion 131 of the fixed disk 130 by a power transmission means such as a belt or a chain. ), and accordingly, when a rotational force is applied to the fixed disk 130 by driving a rotation drive source fixed to the rotating panel 200, the fixed disk 130 is fixed to the support frame 40, for example. The rotating panel 200 is rotated by the rotational force.

In one embodiment, one or more sensors may be installed to detect an initial rotational position and an angle of rotation of the rotating panel 200 with respect to the shaft 111 (ie, with respect to the support frame 40). In the illustrated embodiment, the rotating panel 200 includes a first detection sensor S1 and a second detection sensor S2. The first detection sensor S1 detects the first detection plate P1 of the fixed disk 130 and the second detection sensor S2 detects the second detection plate P2 of the rotating disk 120. . The first sensor S1 may be implemented as an optical sensor having a light emitting unit and a light receiving unit. In this case, when the first sensing plate P1 is positioned between the light emitting unit and the light receiving unit of the first sensor S1, the light receiving unit Since does not receive light, it can sense that the first detection plate P1 is located at the position of the first detection sensor S1. The second detection sensor (S2) is also implemented as such an optical sensor to detect whether the second detection plate (P2) is located at the position of the second detection sensor (S2), in an alternative embodiment, the first and second detection Of course, each of the sensors S1 and S2 may be implemented as a sensor of a different known method.

In one embodiment, the measurement signals of the first detection sensor (S1) and the second detection sensor (S2) are transmitted to a control unit (not shown), and the control unit moves the rotary panel 200 based on the measurement signal of the detection sensor to the shaft ( 111), it can be determined whether or not it is in the initial rotational position. An exemplary method of determining whether the rotation panel 200 is in an initial position based on the measurement signals of the first and second detection sensors S1 and S2 will be described later with reference to FIG. 9 .

7 schematically shows a state in which the rotation panel 200 attached to the rotation limiting device 100 starts to rotate from an initial position. For convenience of description, the state in which the rotating panel 200 is positioned as shown in FIG. 7(a) will be referred to as an initial rotational position (“initial position”). In the initial position of Figure 7 (a), the first detection sensor (S1) and the second detection sensor (S2) on the rotation panel 200 in the 3 o'clock direction and 1 o'clock direction from the central axis of the rotation limiting device 100, respectively is located, and at this time, the first detection plate P1 of the fixed disk 130 and the second detection plate P2 of the rotating disk 120 are connected to the first detection sensor S1 and the second detection sensor S2, respectively. It is assumed that it is located at a position detected by

In addition, the rotation panel 200 is integrally connected to the rotation ring 112 of the rotation limiting device 100, and the shaft 111 and the fixed disk 130 coupled thereto are, for example, a support frame (40 in FIG. 1), etc. Assume that the frame of the device is fixed.

Now, the rotation panel 200 is rotated counterclockwise with respect to the fixed disk 130. As indicated by the arrow in FIG. 7 (b), the rotation panel 200 is rotated counterclockwise until the first detection sensor S1 at 3 o'clock in FIG. 7 (a) is positioned at approximately 9 o'clock. did At this time, since the first detection sensor S1 and the second detection sensor S2 are attached to the rotation panel 200, they rotate together with the rotation panel 200. However, since the shaft 111 and the fixed disk 130 coupled thereto are fixed to a device frame such as a support frame (40 in FIG. 1), the first sensing plate P1 of the fixed disk 130 is also fixed and rotates. You will understand not to. In addition, as can be seen in FIGS. 3 and 4, when the rotating panel 200 rotates, the first stopper 115 protruding from the top of the rotating ring 112 also rotates in a counterclockwise direction (that is, in the direction A in FIG. 3). While rotating from the first end 122a to the second end 122b along the lower guide groove 122 of the rotating disk 120, the rotating disk 120 does not rotate because it does not interfere with the rotating disk 120. . That is, while the rotation panel 200 rotates from the initial position of FIG. 7 (a) to the state of FIG. 7 (b), the rotation disk 120 does not rotate.

After that, it is assumed that the rotation panel 200 further rotates counterclockwise as indicated by the arrow in FIG. 7(c). At this time, by the rotation of the rotating panel 200, the first detection sensor S1 and the second detection sensor S2 moved by the same distance as the arrows in FIG. 7(c) and rotated until approximately 12 o'clock. However, since the first stopper 115 of the rotary ring 112 has reached the second end 122b of the lower guide groove 122 in the state of FIG. 7 (b), in FIG. 7 (b) to FIG. 7 ( While rotating up to c), the first stopper 115 continues to rotate while pushing the second end 122b, and as a result, the rotating ring 112 and the rotating disk 120 rotate counterclockwise together. Accordingly, it will be understood that the second sensing plate P2 attached to the rotating disk 120 rotates counterclockwise along with the rotating panel 200 from FIG. 7(b) to FIG. 7(c).

Meanwhile, at this time, as can be seen in FIGS. 3 and 4, while the rotating disk 120 rotates in a counterclockwise direction (direction A in FIG. 3), the rotating disk ( 120), the upper guide groove 121 rotates counterclockwise, and the second end 121b of the upper guide groove 121 reaches the second stopper 135, the second stopper 135 ) Because of this, it is no longer possible to rotate, and the rotational position at this time becomes the maximum rotational position of the rotary panel 200. In addition, an angle at which the rotating panel 200 rotates from the initial position to the maximum rotational position will be referred to as the maximum rotational angle.

In this way, when the rotation panel 200 rotates counterclockwise from the initial position of FIG. 7 (a), the first stopper 115 can rotate along the lower guide groove 122 of the rotation disk 120 In the rotation range, only the rotation panel 200 rotates, and thereafter, the rotation panel 200 and the rotation disk during the rotation range in which the upper guide groove 121 of the rotation disk 120 does not interfere with the second stopper 135 As the 120 rotates together, the rotation panel 200 can rotate up to the maximum rotational position.

8 shows a state in which the rotation panel 200 attached to the rotation limiting device 100 returns to its initial position. For convenience of explanation, it is assumed that the rotating panel 200 rotates clockwise from the position shown in FIG. 7(c) and returns to the initial position. FIG. 8(a) is the same view as FIG. 7(c), and shows a state just before the rotating panel 200 rotates clockwise for return.

Figure 8 (b) is a state in which the rotating panel 200 is rotated approximately 90 degrees clockwise by the length of the arrow from Figure 8 (a), and Figure 8 (c) is rotated approximately 90 degrees further in Figure 8 (b) is in a state As can be understood from FIGS. 3 and 4, the rotating panel 200 rotates clockwise (ie, B direction) in a state where the first stopper 115 is near the second end 122b of the lower guide groove 122. When it rotates, the first stopper 115 does not interfere with the rotating disk 120 until it reaches the first end 122b, so the rotating disk 120 does not move. That is, while the rotation panel 200 is from FIG. 8 (a) to FIG. 8 (c), only the rotation panel 200 and the first and second detection sensors S1 and S2 attached thereto rotate, and the second detection plate ( P2) does not rotate.

Meanwhile, while the rotation panel 200 rotates from FIG. 8(a) to FIG. 8(c), the first detection sensor S1 detects the first detection plate P1 at the position shown in FIG. 8(b). However, since the second detection sensor S2 does not detect the second detection plate P2 at this time, the control unit may determine that the rotating panel 200 has not reached its initial position.

Also, when the rotary panel 200 comes to the position shown in FIG. 8(c), the second detection sensor S2 detects the second detection plate S1. However, since the first detection sensor S1 does not detect the first detection plate P1 at this time, the control unit may determine that the rotating panel 200 has not reached its initial position even at this time.

After that, it is assumed that the rotation panel 200 further rotates clockwise from FIG. 8(c) to FIG. 8(d). Since the first stopper 115 reached the first end 122a of the lower guide groove 122 in FIG. 8(c), while rotating from FIGS. 8(c) to 8(d), the first stopper 115 ) rotates while pushing the first end 122a clockwise, as a result, the rotating ring 112 and the rotating disk 120 rotate clockwise together. Accordingly, it will be understood that the second sensing plate P2 attached to the rotating disk 120 rotates counterclockwise together with the rotating panel 200 from FIG. 8(c) to FIG. 8(d).

On the other hand, since the second sensor S2 and the second sensing plate P2 rotate together from FIG. 8(c) to FIG. is continuously sensed, and when the rotation panel 200 rotates to the position shown in FIG. 8(d), the first detection sensor S1 also detects the first detection plate P1. Therefore, in the state of FIG. 8 (d), the first detection sensor (S1) can detect the first detection plate (P1) and the second detection sensor (S2) can detect the second detection plate (P2), the control unit It can be determined that the rotating panel 200 has reached its initial position because the two detection sensors S1 and S2 simultaneously detect the detection plates P1 and P2, respectively.

In this way, when the rotation panel 200 rotates clockwise from an arbitrary rotation position in FIG. 8 (a), the first stopper 115 can rotate along the lower guide groove 122 of the rotation disk 120 Only the rotation panel 200 rotates in the rotation range in which there is rotation, and after that, the upper guide groove 121 of the rotation disk 120 rotates with the rotation panel 200 during the rotation range in which the second stopper 135 does not interfere As the disk 120 rotates together, the rotation panel 200 can return to its initial position, and at this time, the control unit detects the first detection plate P1 by the first detection sensor S1 and detects the second detection sensor ( When the second sensing plate P2 is sensed simultaneously by S2), it can be determined that the rotating panel 200 has returned to its initial position.

9 is a flowchart illustrating a method of detecting rotation of a rotating panel according to an exemplary embodiment, and the rotational operation of the rotating panel 200 of FIGS. 7 and 8 is shown as a flowchart.

Referring to FIG. 9, in step S10, the control unit checks the initial position of the rotating panel 200 based on the measured values (sensing signals) of the first sensor S1 and the second sensor S2. do. For example, as shown in FIG. 7 (a), the rotation panel 200 is positioned, that is, the first detection sensor S1 detects the first detection plate P1 and the second detection sensor S2 detects the second detection sensor S2. When the sensing plate P2 is sensed, it can be determined as the initial position.

After that, assuming that the rotation limiting device 100 and the rotation panel 200 are installed in the dental radiographic apparatus and the rotary arm 60 is integrally coupled to the rotation panel 200, for example, as shown in FIG. 1, the patient For oral cavity scanning, the rotary panel 200 and the rotary arm 60 coupled thereto start to rotate (S20). For example, as shown in FIGS. 7(a) to 7(c), the rotation panel 200 rotates counterclockwise (with reference to FIG. 7) so that the rotary arm 60 rotates by a predetermined rotation angle (eg, The patient's oral cavity may be radiographed while rotating by a predetermined rotation angle of 360 degrees or more or by a maximum rotation angle.

When the rotary panel 200 and the rotary arm 60 coupled thereto rotate by a preset rotation angle and complete the scanning operation, the control unit returns the rotary panel 200 (S30). That is, as shown in FIGS. 8(a) to 8(d), the rotating panel 200 rotates clockwise (based on FIG. 8). At this time, the control unit detects the first detection plate P1 by the first detection sensor S1 but does not detect the second detection plate P2 by the second detection sensor S2 (FIG. 8(b)) or 2 When the detection sensor S2 detects the second detection plate P2 but the first detection sensor S1 does not detect the first detection plate P1 (Fig. 8(c)), the rotary panel 200 It is determined that the initial position has not been reached, and the rotation panel 200 may continue to rotate (S40).

Then, if the rotating panel 200 is positioned as shown in FIG. 8 (d), the first detection sensor S1 detects the first detection plate P1 at the same time and the second detection sensor S2 detects the second detection plate ( When detecting P2), the control unit may determine that the rotation panel 200 has reached the initial position and may end the return operation of the rotation panel 200 (S50).

As described above, those skilled in the art in the field to which the present invention belongs may make various modifications and variations from the description of the above specification. For example, for the first stopper 115 and the lower guide groove 122 guiding it, in the illustrated embodiment, the first stopper 115 is installed on the rotating ring 112 and the lower Although it is shown that the guide groove 122 is formed, in an alternative embodiment, on the contrary, a stopper is formed below the rotating disk 120 and a guide groove for accommodating and guiding the stopper is formed on the top of the rotating ring 112 may be In addition, even in the case of the second stopper 135 and the upper guide groove 121 guiding it, in an alternative embodiment, a stopper is formed above the rotating disk 120 and the stopper is accommodated at the bottom of the fixed disk 130 It will be understood that a guide groove may be formed.

In addition, although the rotation limiting device 100 is illustrated and described as an example applied to a dental radiographic apparatus in the present specification, the rotation limiting device 100 is not limited to the dental radiographic device, and any two objects rotate relative to each other. It will also be appreciated that when combined to do so, it can be used as a device interposed between two objects to limit the relative angle of rotation between them.

Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the claims to be described later, but also those equivalent to these claims.

100: rotation limiter 110: base part
111: shaft 112: rotary ring
115: first stopper 120: rotating disk
121: upper guide groove 122: lower guide groove
130: fixed disk 131: side part
135: second stopper 200: rotating panel
S1, S2: detection sensor P1, P2: detection plate

Claims (5)

As a rotation limiter,
A base portion 110 having a shaft 111 and a rotating ring 112 rotatably coupled to the outer circumference of the shaft;
A fixed disk 130 fixed to the shaft 111; and
A rotating disk 120 interposed between the rotating ring 112 and the fixed disk 130 and rotatably coupled to the outer circumference of the shaft; includes,
The rotating disk 120 has an upper guide groove 121 formed on an upper surface with a predetermined arc length and a lower guide groove 122 formed on a lower surface with a predetermined arc length,
The rotating ring 112 has a first stopper 115 protruding upward on an upper surface and the fixed disk 130 has a second stopper 135 protruding downward on a lower surface, 1 stopper 115 is accommodated in the lower guide groove 122 and the second stopper 135 is accommodated in the upper guide groove 121, thereby limiting the rotation range of the rotation ring 112 relative to the shaft 111 Rotation limiting device, characterized in that configured to. According to claim 1,
Rotation limiting device, characterized in that the distance of the upper guide groove 121 and the lower guide groove 122 from the central axis of the rotary ring 120 is different. According to claim 1,
The rotation ring 112 is configured to rotate within a first rotation angle range of less than 360 degrees with respect to the rotation disk 120, and the rotation disk 120 with respect to the fixed disk 130 is less than 360 degrees. A rotation limiting device configured to rotate within a second rotation angle range. According to claim 1,
a first sensing plate P1 protruding radially from the fixed disk 130; and
The rotation limiting device further comprising a second sensing plate (P2) protruding radially from the rotating disk (120). According to claim 4,
A first detection sensor (S1) installed on a rotating member coupled to the rotation ring (112) and sensing a first detection plate (P1);
a second detection sensor (S2) installed on the rotating member and sensing a second detection plate (P2); and
Further comprising a control unit for determining the rotational position of the rotating member based on the measurement signals of the first and second detection sensors;
When the rotating member rotates at a predetermined angle and then returns to the initial position, the control unit moves the rotating member to the initial position when the first detection sensor detects the first detection plate and the second detection sensor detects the second detection plate at the same time. Rotation limiting device characterized in that it is determined that it has returned to.

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