JP2015159973A - X-ray equipment - Google Patents

Abstract

[Problem] To easily move to a predetermined position relative to a dental treatment chair and to securely position the patient at the predetermined position so that an X-ray image of the jaw can be taken while the patient is lying on his or her back in a dental treatment chair. . [Solution] The X-ray imaging device includes an X-ray tube that is positioned on the side of a dental treatment chair and irradiates X-rays onto the head of a subject lying face up on the chair while rotating around the head. , and a detector that detects the X-rays that have passed through the head while rotating around the head. This device includes: an operating section operated by an operator; a transmitting means for transmitting an operation given to the operating section; a position specifying means for specifying a predetermined position when placing the X-ray imaging apparatus next to the chair; A fixing means is provided for locking the X-ray imaging apparatus at the predetermined position by engaging the position specifying means in response to the operation transmitted by the transmission means. [Selection diagram] Figure 9

Description

  The present invention relates to an X-ray imaging apparatus using X-rays, and in particular, faces an X-ray tube and a detector that detects X-rays irradiated from the X-ray tube and transmitted through an imaging region of a subject. And an X-ray imaging apparatus having a structure for rotating the X-ray tube and the detector around a subject.

  In recent years, tomography of a subject based on the tomosynthesis method has been actively performed. Although the principle of this tomosynthesis method has been known for a long time (see, for example, Patent Document 1), in recent years, a tomographic method has also been proposed in which it is desired to enjoy the simplicity of image reconstruction based on the tomosynthesis method. (For example, see Patent Document 2 and Patent Document 3). In addition, many examples are seen for dental use (see, for example, Patent Document 4 and Patent Document 5).

  As one application of the tomosynthesis method to dentistry, a panoramic imaging apparatus that obtains a panoramic image in which a curved dentition is developed in a two-dimensional plane has been put into practical use. This panoramic imaging apparatus normally has a pair of an X-ray tube and a detector having vertically long two-dimensionally arranged pixels around the oral cavity of a subject along a dentition whose rotation center is assumed. A mechanism for rotating the center of rotation in a complicated manner so as to draw a trajectory is provided. A constant value is maintained between the X-ray tube and the detector. The above-described constant trajectory is a trajectory for focusing on a reference tomographic plane (a tomographic plane existing three-dimensionally) set in advance along a dentition regarded as a standard shape and size. During this rotation, X-rays emitted from the X-ray tube are transmitted through the subject at regular intervals, and detected as digital frame data by the detector. For this reason, frame data focused on the reference tomographic plane is collected at regular intervals. This frame data is reconstructed by the tomosynthesis method to obtain a panoramic image of the reference tomographic plane.

  Further, Patent Document 6 discloses an example of a panoramic imaging apparatus having an imaging system in which an X-ray tube and a detector can both rotate independently of each other so as to form a circular orbit around the same center point. . The jaw is positioned in the circular orbit. The speed pattern is controlled so that the X-rays emitted from the X-ray tube are always directed to the detection surface of the detector.

JP-A-57-203430 JP-A-6-88790 JP-A-10-295680 US Patent Publication US2006 / 0203959A1 JP2007-136163A International Publication WO2012 / 008492

  As described above, various panoramic imaging apparatuses are provided, and these apparatuses usually need to be used inside a shielding room called an X-ray management area. This X-ray management area is an area that is provided to clearly demarcate a place where the radiation dose is above a certain level and prevent unnecessary entry to the person in order to prevent unnecessary radiation exposure.

  For this reason, for example, when it is desired to perform panoramic imaging of a patient undergoing dental treatment, the patient needs to move from the dental treatment chair to the X-ray imaging room, that is, the X-ray management area. However, this movement is very cumbersome for both doctors and patients. For example, when the gum is punctured in the treatment chair and it is desired to confirm the puncture state with X-rays, the puncture state moves to the X-ray room. Moving in this puncture state itself is uncomfortable for the patient, and the doctor also takes time and effort to confirm the puncture position again in the X-ray imaging room in consideration of the shift of the puncture position during movement. Take it.

  For this reason, if it is possible to puncture the dental treatment chair while lying on its back and X-ray imaging can be performed in the puncture state, it is very convenient for both the patient and the doctor. However, in that case, the space around the dental treatment chair is limited, and the vicinity is also a place where various staff such as nurses including the doctor themselves come and go.

  For this reason, it is convenient if the panoramic imaging apparatus itself is configured to be portable and can be easily moved to the side of the dental treatment chair and positioned at a predetermined position with respect to the dental treatment chair. However, conventionally, a panoramic imaging apparatus that has such a function and can be easily used in a dental clinic or the like has not been provided.

  The present invention has been made in view of the above circumstances, and can be easily performed up to a predetermined position with respect to the chair so that the patient can perform X-ray imaging of the jaw while lying on the back of the dental treatment chair. It is an object of the present invention to provide an X-ray imaging apparatus that can move and can be reliably positioned at the predetermined position.

  In order to achieve the above object, an X-ray imaging apparatus according to an aspect of the present invention is positioned on the side of a dental treatment chair and rotates around the head around the head of a subject lying on his back on the chair. A portable dental X-ray imaging apparatus comprising an X-ray tube that irradiates X-rays and a detector that detects the X-rays transmitted through the head while rotating around the head. . The apparatus includes an operation unit operated by an operator, a transmission unit that transmits an operation given to the operation unit, a position designation unit that designates a predetermined position when the X-ray imaging apparatus is laid on the chair, And a fixing unit that locks the X-ray imaging apparatus at the predetermined position by being locked to the position specifying unit according to the operation transmitted by the transmitting unit.

  The X-ray imaging apparatus according to the present invention can be easily moved to a predetermined position on the back side of the dental treatment chair, and can be reliably positioned at the predetermined position. Thereby, the X-ray imaging of the jaw can be performed by placing the head in the imaging space of the X-ray imaging apparatus while the patient is lying on the dental treatment chair on his back.

In the accompanying drawings,
FIG. 1 is a perspective view showing an outline of an X-ray panoramic imaging apparatus as an X-ray imaging apparatus according to an embodiment as viewed from the front side. FIG. 2 is a perspective view showing an outline of an X-ray panoramic imaging apparatus as an X-ray imaging apparatus according to an embodiment as seen from the back side. FIG. 3 is a perspective view for explaining the positional relationship between the X-ray panoramic imaging apparatus and the dental treatment chair and the position of the subject at the time of imaging. FIG. 4 is a partial cross-sectional view illustrating a scattered radiation shielding plate built in the bottom surface. FIG. 5 is a perspective view for explaining the scattered radiation shielding cover. FIG. 6 is a diagram illustrating a four-surface shielding structure including a scattered radiation shielding cover that covers the upper surface and both side surfaces and a scattered radiation shielding plate that covers the bottom surface portion. FIG. 7 is a side view showing the X-ray panoramic imaging apparatus and the floor fixing unit according to the embodiment. 8A and 8B are a front view and a side view of the operation lever. FIG. 9 is a schematic diagram along the line IX in FIG. 10 for explaining the outline and operation of the link mechanism from the operation lever to the positioning pin together with the positioning operation of the positioning pin. FIG. 10 is a diagram for explaining an outline of a cross-sectional structure taken along lines II and II-II in FIG. FIG. 11 is a diagram for explaining the structure of the positioning pin and the vertical movement operation. FIG. 12 is a perspective view of the floor fixing portion. FIG. 13 is a cross-sectional view along a direction orthogonal to the longitudinal direction of the floor fixing portion. FIG. 14 is a block diagram showing the connection of sensors, LEDs, and processors for detecting the vertical movement of the positioning pins. FIG. 15 is a diagram for explaining another embodiment of the position detection means of the floor fixing part for positioning. FIG. 16 is a diagram for explaining still another embodiment of the position detection means of the floor fixing portion for positioning.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  An embodiment of an X-ray panoramic imaging apparatus as an X-ray imaging apparatus according to the present invention will be described with reference to FIGS.

  The panoramic imaging apparatus 1 is configured as a dental diagnostic apparatus that captures a panoramic image of a subject's jaw (including a dentition).

  According to this panoramic imaging apparatus 1, a pseudo three-dimensional tomographic image of the subject's jaw (the image itself is a two-dimensional image, but three-dimensionally according to the shape of an imaging region such as a dentition). The displayed cross-sectional image) can be taken. Moreover, according to this apparatus 1, the partial imaging | photography (or precision imaging | photography) which image | photographs the partial area | region of the dentition of a jaw part more precisely can also be performed.

  In this embodiment, the X-ray imaging apparatus according to the present invention is configured as a panoramic imaging apparatus, but the X-ray imaging apparatus is not necessarily limited to the dental field. This X-ray imaging apparatus may be configured to image various other parts such as otolaryngology imaging and bone / joint parts of limbs.

  FIG. 1 and FIG. 2 show the external appearance of the dental X-ray panoramic imaging apparatus 1 according to this embodiment from the front side and from the back side. FIG. 3 shows a state in which the panoramic photographing apparatus 1 is used by being positioned on the side of the dental treatment chair 2.

As can be seen from FIGS. 1 and 2, the panoramic photographing apparatus 1 includes a pedestal portion 12 on which four casters 11 (moving means) are mounted, a power supply box 13 mounted on the pedestal portion 12, and a pedestal portion 12. And a console 15 equipped with a computer for controlling and image processing. The console 15 is connected to a control circuit (not shown) placed in the power supply box 13 via a communication cable or by wireless communication. Further, as will be described later, the panorama photographing apparatus 1 includes a floor fixing portion 71 (described later) formed as a separate body that plays an important role in positioning. On the other hand, the portion mounted on the pedestal portion 12 and movable by the caster 11 constitutes the device main body BD of the panoramic photographing device 1.
[Overview of overall system configuration]
First, an outline of the overall mechanical configuration of the panorama photographing apparatus 1 will be described.

  The casters 11 are provided at the four corners of the lower surface of the base 12. For this reason, the dentist or the operator can move by pushing the panoramic imaging apparatus 1 and can freely move from room to room or between the room place and the side of the dental treatment chair 2. . The caster 11 can be locked and unlocked by depressing or raising a pedal 11P (see FIG. 2).

  The elevator 14 includes an elevator mechanism (not shown) in its interior, and is electrically driven with respect to the pedestal 12 (that is, the floor surface, that is, the dental treatment chair 2) within a predetermined height range (for example, 10 to 15 cm). It is configured to be movable up and down at a height position. The power supply box 13 includes a power supply circuit that supplies necessary power to each part of the system. The elevator 14 provides an imaging space S having a substantially rectangular parallelepiped shape for performing X-ray scanning with the head H of the patient P positioned as shown in FIG.

  Assuming that the vertical movement direction of the elevator 14 is the Y axis, XYZ orthogonal coordinates as shown can be set. Since the head H of the patient P is positioned in the imaging space (object space) S as shown in FIG. 3 at the time of X-ray imaging, the direction of the Z axis is the direction from the top of the head H toward the toes (median) Line direction). For this reason, the direction of the Z axis coincides with the body axis direction. Furthermore, since the direction of the Z axis is also the front-rear direction of the device 1, it can also be called the front-rear direction.

  In the present embodiment, the side where the head H of the subject P is put into the imaging space S of the panoramic imaging apparatus 1 is referred to as the front surface (front surface), and the opposite surface is referred to as the rear surface (back surface).

  The elevator 14 includes a bottom surface portion 14A positioned on the lower side thereof, and a back surface portion 14B positioned in contact with the bottom surface portion 14A on the back surface side of the bottom surface portion 14A in the X-axis direction. Further, the elevator 14 further includes a scattered radiation shielding cover (part of the shielding body) which overlaps and overlaps both sides of the bottom surface portion 14A, that is, both sides in the X-axis direction and can be manually slid in the front-rear direction. ) 14C. The scattered radiation shielding cover 14C is supported by rails RL provided on both lateral sides of the bottom surface portion 14A, and is slidably engaged in the front-rear direction. In order to perform this sliding, a handle 16 is attached to the upper side and the rear side of the scattered radiation shielding cover 14C.

  As will be described later, the scattered radiation shielding cover 14 </ b> C functions as a first shielding body that shields X-ray scattering properties.

  The bottom surface portion 14A is formed of a member obtained by folding a rectangular resin or metal plate and joining the both ends thereof to have a certain height and bend toward the outside in the height direction, that is, the Y-axis direction. The The inside of this bending member is hollow. The reason for this curvature is that the imaging space S is secured as wide as possible and the design is taken into consideration.

  As shown in FIG. 4, a scattered radiation shielding plate (second shielding member) 20 made of a lead plate is attached to the upper side of the cavity of the bottom surface portion 14A. A part of the edge in the horizontal direction (X-axis direction) of the scattered radiation shielding plate 20 is folded along the folding of the bottom surface portion 14A in the height direction (Y-axis direction). The lead plate has a thickness of 0.3 mm and functions as a second shielding body that shields scattered X-ray rays.

  A mechanism portion including a drive system including a motor, a power transmission mechanism, and the like and an encoder (rotational position sensor) for monitoring the operation of the drive system is incorporated in the back surface portion 14B of the elevator 14. As this mechanism portion, two arms 21 and 22 coupled to two electric motors that can rotate independently of each other project from the back surface portion 14B into the imaging space S. These arms include an L-shaped X-ray tube arm 21 having an X-ray tube 23 for irradiating fan-shaped X-rays at the tip side and an L-shape having a detector 24 for detecting X-rays at the tip side. This is a detector arm 22 having a shape. The other ends of both arms 21 and 22 are coaxially linked to the position of the rotation center O and can rotate independently of each other (see arrows T and D in FIG. 1). Are combined separately. The motor is, for example, a stepping motor, and its rotational position is detected by an encoder (not shown). A virtual straight line parallel to the Z axis passing through the rotation center O will be referred to as a central axis CA.

  Further, each of the X-ray tube arm 21 and the detector arm 22 supports only the tip side portion, that is, the portion containing the X-ray tube 23 and the detector 24 on the support side, that is, the back surface portion 14B. The support portion can be independently rotated within a predetermined angle range with respect to the support portion side. Arrows T1 and D1 in FIG. 1 indicate this rotation. That is, the X-ray tube 23 and the detector 24 have a total of four degrees of freedom of independent rotation with respect to the back surface portion 14B.

  The X-ray tube 23 incorporates a collimator (not shown). This collimator collimates the X-rays irradiated by the X-ray tube 23 according to the shape of the X-ray incident window WD of the detector 24. The X-ray incident window WD has an elongated two-dimensional opening. For this reason, the X-rays irradiated from the X-ray tube 23 are narrowed down to a fan beam XB having a rectangular cross section in accordance with the size of the X-ray incident window WD.

  For example, the detector 24 has a structure in which a plurality of modules in which semiconductor elements that directly convert X-rays into electric signals are arranged in two-dimensional pixels are arranged in a plurality of columns. An example of the semiconductor is CdTe. Of course, the X-ray detection element of the detector 24 does not necessarily use a semiconductor element, and may be a detector in which a photodiode and a scintillator are combined.

  At the time of imaging, the head H of the subject P is located in the imaging space S as will be described later. At this time, the X-ray tube 23 and the detector 24 are positioned substantially opposite to each other across the jaw. When the apparatus is activated, the X-ray tube 23 and the detector 24 rotate independently of each other over the head H over an angle range of, for example, 220 ° (see the arrow in FIG. 3). X-rays are emitted from the tube 23 continuously or in pulses. For this reason, the X-ray XB irradiated from the X-ray tube 23 passes through the jaw of the head H and is detected by the detector 24. The electric signal output from the detector 24 is sent as frame data to the image processor of the console 15 at a constant rate. The image processor performs a shift-and-add process based on the tomosynthesis method on the frame data, and reconstructs a panoramic image along a cross section in which, for example, the dentition of the jaw is curved along the dentition surface.

  As shown in FIGS. 1 and 3, an L-shaped teaching arm 25 is provided in the imaging space S coaxially with the end of the arms 21 and 22 on the apparatus body side at the position of the rotation center O. Yes. The teaching arm 25 is used for designating a range of a part (target tooth) of a dentition that the dentist wants to examine particularly precisely. In other words, it has a position designation function called so-called precision photographing or partial photographing, which is performed by a conventional intraoral photographing method. A laser beam can be irradiated from the tip of the teaching arm 25. Therefore, the dentist visually confirms the position where the laser beam hits the dentition while holding the tip of the teaching arm 25 and rotating the arm around the jaw. Through this visual check operation, the angle position of the target tooth in the circumferential direction and the angle of the X-ray passing through the target tooth when X-ray imaging is actually performed can be verified in advance. The teaching arm 25 is provided with an encoder and a switch (not shown). For this reason, when the angle position and the angle of the passing X-ray are determined, the dentist can store the setting information by pressing the switch. This stored information is used by the control unit of the console 15 at the time of actual imaging, and the X-ray irradiation operation and the rotation operation of the X-ray tube 23 and the detector 24 are controlled according to the information.

  On the other hand, as shown in FIG. 5, the scattered radiation shielding cover 14 </ b> C serves to define the upper surface and the left and right side surfaces of the imaging space S and to shield X-rays. For this reason, the scattered radiation shielding cover 14 </ b> C has a shape obtained by bending a plate having an X-ray shielding function with a constant width into a generally inverted U shape. In other words, the scattered radiation shielding cover 14C has a flat upper surface portion (ceiling body) 14U and both side surface portions (wall bodies) 14L and 14R that are curved and integrally formed from the upper surface portion 14U.

  Furthermore, although the scattered radiation shielding cover 14C has an X-ray shielding function as a whole, the scattered radiation shielding cover 14C is formed by combining two kinds of members related to light transmission. Specifically, the scattered radiation shielding cover 14C includes a translucent portion 14TR having translucency and a non-translucent portion having non-translucency integrally coupled to the translucent portion 14TR. 14NT. Both the translucent portion 14TR and the non-translucent portion 14NT partially cover the upper surface portion 14U and the side surface portions 14L and 14R.

  The non-translucent portion 14NT is formed in an inverted L shape when viewed from the side so as to cover the upper surface portion 14U and the side surface portions 14L and 14R and to bear a part of the rear surface side and extend to the bottom surface side. ing. This non-translucent portion 14NT is formed as a laminated body in which, for example, a lead plate having a thickness of 0.3 mm is sandwiched between resin or metal plates.

  On the other hand, the translucent portion 14TR is generally formed in an inverted U shape so as to cover the front side of the non-translucent portion 14NT across the upper surface portion 14U and the side surface portions 14L, 14R. In particular, since the height of the left and right sides of the light-transmitting portion 14TR is shorter than that of the non-light-transmitting portion 14NT, the bottom end portion of the light-transmitting portion 14TR is supported by the non-light-transmitting portion 14NT. It is like that.

  In the present embodiment, the light transmitting body portion 14TR is formed of a transparent acrylic resin having a thickness of 8.5 mm containing a lead component, and thereby has an X-ray shielding ability of a lead equivalent of 0.3 mmPb. Therefore, the translucent portion 14TR has an X-ray shielding function, but also has light transparency. Although the acrylic resin itself is transparent, it contains a lead component, so it actually has a yellowish color but is translucent. For this reason, as will be described later, when the head H of the patient P enters the imaging space S, the patient can see the outside of the cover. Of course, the operator can also visually observe the inside of the imaging space S.

  The end portion of the lead-containing acrylic resin forming the light transmitting portion 14TR is inserted into the end portion of the non-light transmitting portion 14NT. For this reason, this acrylic resin and the lead plate sandwiched by the non-translucent portion 14NT are connected to each other without a gap. Therefore, the X-ray shielding function on the upper surface and both sides of the imaging space S is ensured in both the translucent portion 14TR and the non-translucent portion 14NT, that is, the scattered radiation shielding cover 14C. In the present embodiment, an X-ray shielding device is configured by the scattered radiation shielding cover 14C and the scattered radiation shielding plate 20 on the bottom surface portion 14C.

  If the view of the scattered radiation shielding cover 14C is changed, it can be said that a part of the scattered radiation shielding cover 14TR, that is, the translucent part 14TR has a light transmitting property while having a function of shielding the scattered radiation as a whole.

  As a result, as shown in FIG. 6, the X-ray shielding function is given to the four surfaces of the upper surface, both side surfaces, and the bottom surface that define the imaging space S.

  Although the details will be described later, the panoramic imaging apparatus 1 is stopped at the side of the dental treatment chair 2 at the front end of the pedestal portion 12 as shown in FIGS. A positioning mechanism 61 for positioning is provided. The positioning mechanism 61 includes a stop pin 62 and a positioning pin 63 which will be described later. The positioning pin 63 moves up and down in conjunction with an operation lever 52 (see FIG. 2) provided on the upper edge of the back surface part 14 via a wire mechanism described later. On the other hand, at a predetermined position of the floor surface F on the rear surface side of the dental treatment chair 2, a substantially triangular shape can be formed in a side view, and the abutment pin 62 can be contacted, and a positioning pin 63 can be inserted. A floor fixing portion 71 (see FIG. 7) having a hole is fixed. For this reason, if the apparatus main body BD is moved, the tip position thereof is aligned with the position of the floor fixing portion 71, and the operation lever 52 is operated with the stop pin 62 in contact with the floor fixing portion 71. The positioning pin 63 can be pushed down. When the positioning pin 63 enters a hole (described later) of the floor fixing portion 71, the apparatus main body BD is positioned at a predetermined position with respect to the dental treatment chair 2 (see FIG. 3).

  Further, when the panoramic photographing apparatus 1 (that is, the apparatus main body BD) is moved to another location, the operation lever 52 is operated to raise the positioning pin 63. Thereby, apparatus main body BD can be released from position fixing with floor fixing | fixed part 71, and apparatus main body BD can be moved to another place.

  In order to move the apparatus main body BD, a rear handle 54 is fixed to the upper end of the rear portion 14B so as to be located on both sides of the operation lever 52. For this reason, the operator can easily move the apparatus main body BD by freely rotating the caster 11 by pulling and pushing the two rear handles 54.

  Further, the apparatus main body BD is provided with a substantially inverted U-shaped side handle 55 that is fixed at one end on the bottom surface of the pedestal portion 12 and rises in the vertical direction from the side. The side handle 55 is formed of a metal pipe, for example. For this reason, of course, when the apparatus main body BD is moved, the carrier can use the side handle 55, while the apparatus main body BD is pushed or pulled in the lateral direction, particularly at the positioning described above. Thus, the position can be easily finely adjusted.

  As shown in FIG. 2, a multipurpose storage rack 56 and a monitor 57 indicating the operating state of the apparatus 1 can be detachably attached to one of the two side handles 55. The storage rack 56 can store a terminal such as a dentist PC for inputting patient information or the like to the apparatus 1. These terminals and the monitor 57 can communicate with a control circuit (not shown) disposed inside the console 15 or the power supply box 13 by, for example, wireless communication.

  Further, an irradiation switch 58 for instructing X-ray irradiation and rotation of the X-ray tube / detector via a cord 58C having a length of 2 m, for example, is provided on the back surface portion 14B.

  As shown in FIG. 2, a guideline pole 59 for a guideline is attached to a position below the back surface portion 14 </ b> B and on the side surface of the power supply box 13 in a state of hanging down toward the floor surface F. The tip of the reference pole 59 on the floor surface side is close to the floor surface F. On the other hand, as shown in FIGS. 2 and 3, the floor surface F is provided with a guideline GL made of tape, paint, or the like arranged on the floor surface F toward the floor fixing portion 71 described above. Therefore, when the apparatus main body BD is moved toward the floor fixing portion 71, that is, toward the dental treatment chair 2, the apparatus main body BD can be easily moved by pushing the tip of the guide pole 59 so as to follow the guideline GL. In addition, the dental treatment chair 2 can be easily accessed. When the stop pin 62 comes into contact with the predetermined surface of the floor fixing portion 71 and stops, the positioning pin 63 is driven by operating the operation lever 52 described above to achieve the positioning described above.

Based on the above configuration, a portable panoramic photographing apparatus 1 having a height of about 100 to 115 cm, a width of about 80 to 95 cm, and a depth of about 75 to 90 cm is provided. In addition, since the X-ray shielding function is given to the four surfaces of the upper surface, both side surfaces, and the bottom surface that define the imaging space S, the imaging space S is regarded as a substantial X-ray shielding room. You can also. Therefore, in this embodiment, the X-ray shielding chamber (that is, the device 1) can be easily carried to an arbitrary place by the caster 11 by grasping and pushing the back handle 54 and can be used there.
[Positioning mechanism]
Next, a positioning mechanism for positioning the panoramic photographing apparatus 1 with respect to the dental treatment chair 2 will be described with reference to FIGS.

  Of course, the main part of the positioning mechanism section is provided in the panoramic photographing apparatus 1 itself, but also includes a positioning floor fixing section 71 fixed to the floor surface F.

  As shown in FIGS. 2 and 8, the elevator 14 of the panoramic photographing apparatus 1 includes an operation lever 52 fixed to a predetermined portion on the upper edge of the back surface portion 14 </ b> B, and a lever driving unit that supports and drives the operation lever 52. 81. The operation lever 52 is provided for the operator to manually tilt and fix the position of the panoramic photographing apparatus 1.

  As shown in FIGS. 8 (A) and 8 (B), the lever driving unit 81 includes a support shaft 82 erected at the predetermined portion and a rotation shaft 83 pivotally supported by the support shaft 82. And have. An operation lever 52 is fixed to the rotating shaft 83. For this reason, if the operating lever 52 is grasped and rotated, the rotating shaft 83 also rotates integrally. A hole HL for inserting a hand is opened in the upper part of the operation lever 52 so as to be easily gripped, but an inflating part 52A that swells round in a side view is partially formed in the lower part thereof. The inflatable portion 52A is in contact with a ball plunger 84 provided upright at the predetermined portion. The ball plunger 84 is locked to the operation lever 52 at positions where the angle of the operation lever 52 is 0 ° (horizontal), 45 °, and 90 ° (vertical), and when the tilting power is applied more than a certain level, It is possible to rotate between.

  Furthermore, as shown in FIGS. 8A and 8B, the lever driving portion 81 has first and second links 85A and 85B provided on one end side of the rotating shaft 83. One end of the first link 85 </ b> A is fixed to one end of the rotation shaft 83. For this reason, the first link 85 </ b> A swings as the rotation shaft 83 rotates. One end of the second link 85B is fixed or rotatable to the other end of the first link 85A, and converts the swing motion of the first link 85A into a reciprocating motion. A wire 86 is connected to the other end of the second link 85B.

  For this reason, as shown in FIG. 8B, the operation lever 52 is upright initial position P1 (90 ° tilt position), and intermediate position P2 tilted forward from the position P1 (45 ° tilt position). Further, it is possible to take a three-stage operation position called a fixed position P3 (a tilt position of 0 °) tilted further forward from the position P2, and to lock each operation position with a certain resistance. On the contrary, the operation lever 52 can be returned in the order of positions P3, P2, and P1. The operator operates the operation lever 52 while resisting a certain resistance by the pole plunger 84, and when the position P1, P2, P3 is reached, a click feeling is obtained, and at that position, with a certain resistance. Locked. Further, as the operation lever 52 is tilted from the initial position P1 to the intermediate position P2 and the fixed position P3, the wire 86 moves in the direction indicated by the arrow A in FIG. If the operation lever 52 is tilted in the opposite direction, the wire 86 moves in the direction indicated by the arrow B in FIG.

  The wire 86 is loosely inserted inside the sheath SF. The sheath SF is fixed and piped inside the elevator 14 so as to avoid the internal mechanism and to form a linear path as much as possible. For this reason, the wire 86 moves as shown by arrows A and B in FIG.

  The tip end of the wire 86 reaches the front end portion on the front side of the pedestal portion 12 and reaches the inside of the pin cover 91 extended in a fixed state at the tip portion. The pin cover 91 is fixed to the distal end portion of the pedestal portion 12, and protrudes from the distal end side by a certain distance in a bowl shape (see FIGS. 7 and 9).

  Inside the pin cover 91, a step-like support portion 92 fixed to the pedestal portion 12 is provided, and the positioning mechanism portion 61 described above is provided between the support portion 92 and the pin cover 91. Yes. The positioning mechanism 61 includes the stop pin 62 and the positioning pin 63 described above.

As shown in FIG. 10, the stepped portion 92 </ b> A of the support portion 92 integrally has protrusions 92 </ b> B that are substantially rectangular parallelepiped at both ends in the lateral direction, that is, in the X-axis direction. The step portion 92A is formed with four guide holes H1, H2, H3, and H4 in a line along the lateral direction. Of these, guide holes H1 and H4 at both ends are guide holes for guiding the positioning pin 63 in the vertical direction. The guide holes H1 and H4 penetrate the stepped portion 92A and the protruding portion 92B in the vertical direction.
As shown in FIG. 11, a positioning pin 63 is held and accommodated in each of the guide holes H1 and H4, and can move up and down along the guide hole H1 (H4). The positioning pin 63 is, for example, a metal cylindrical rod having a predetermined diameter, and has an annular protrusion 63A in the middle in the vertical direction. Similarly, annular protrusions HT1 and HT2 are respectively provided at the positions of the upper and lower ends of the guide hole H1 (H4) in the vertical direction. For this reason, as shown in FIG. 11, the distance L1 between the projection 63A in the middle of the pin 63 and the projection HT2 at the lower end of the guide hole H1 (H4) is set as the vertical movable range of the positioning pin 63. Yes.

  Further, a coiled spring 93 is inserted in a space between the protrusion 63A of the positioning pin 63 and the protrusion HT1 on the upper end side of the guide hole H1 (H4). When a certain force is applied to the positioning pin 63, the pin 63 takes the initial position Q1 indicated by the solid line in FIG. This initial position Q1 is obtained by a “large” pulling force acting in the direction indicated by the arrow B described above when the operation lever 52 is at the initial position P1 (90 ° tilt position). In this case, the upper end of the positioning pin 63 is flush with the upper surface of the projecting portion 92B of the support portion 92, and the lower end is almost flush with the lower surface of the stepped portion 92A. That is, the positioning pin 63 is accommodated in the guide hole H1 (H4).

  Further, when the operation lever 52 is tilted to the intermediate position P2 (45 ° tilt position), the wire moves in the direction of the arrow A, and the force applied to the spring 93 becomes “small”. As a result, the elastic force of the spring 93 is increased by the decrease in the force, and the positioning pin 63 is pushed downward.

  Further, when the operation lever 52 is tilted to the fixed position P3 (0 ° tilt position), the wire further moves in the direction of the arrow A, and the force applied to the spring 93 becomes “0”. As a result, the spring 93 has only its own elastic force, and the positioning pin 63 is further lowered.

  On the other hand, as shown in FIGS. 9 and 10, the positioning mechanism portion 61 is a mechanism for moving the two positioning pins 63 up and down in accordance with the movement of the wire 86. Specifically, the tops of the two positioning pins 63 are rigidly connected to the suspension shaft 63C. The suspension shaft 63 </ b> C of both the pins 63 is fixed to the lateral arm 101 that is laterally mounted in the lateral direction, that is, the X-axis direction. The horizontal arm 101 is pivotally supported by two rings 102 at predetermined positions on both ends thereof. Further, the two rings 102 are supported by the two arms 103 so as to roll along the upper surface thereof. The two arms 103 are rigidly connected to a single link 104, and the link 104 is rigidly connected to the rotating arm 105. The rotating arm 105 is further coupled to the wire 86 described above via a connecting body 106.

  The guide holes H1 and H4 described above are formed with a slit-like opening OP over a predetermined length from the upper end side of the guide holes H1 and H4 in order to allow the horizontal arm 101 to move in the vertical direction. (See FIG. 10).

  Further, at least one of the guide holes H1 and H4 is provided with three hall sensors 111A, 111B, and 111C so as to be slightly recessed from the inner surface thereof. The three hall sensors 111A to 111C are detection means for detecting the vertical movement of the positioning pin 63. For this reason, the positions of the three hall sensors 111A to 111C in the vertical direction, that is, in the Y-axis direction are respectively the distances of an initial position Q1, a first-stage descending position Q2, and a second-stage descending position Q3 described later. Correspondingly, the distance is set to be the same. The two lower positions Q2 and Q3 other than the initial position Q1 are positions determined by the lower end of the positioning pin 63 being restricted by the bottom of the two-stage groove and hole described later of the floor fixing portion 71 by the extension of the spring 93. It is.

  On the other hand, a magnet 112 is embedded in the outer peripheral surface of the positioning pin 63 so as to face the uppermost hall sensor 111A at the initial position Q1. As a result, the Hall sensor 111A is positioned in the magnetic flux generated from the magnet 112, so that the Hall sensor 111A generates a voltage and outputs the voltage signal. The hall sensors 111A to 111C send their voltage signals to the control circuit of the power supply box 13 described above via lead wires (not shown).

  On the other hand, as shown in FIGS. 9 and 10, two stop pins 62 are fixedly provided in the two middle guide holes H2 and H3 described above. That is, each of the two stop pins 62 includes a fixing member 62A, and the fixing member 62A is fixed to the stepped portion 92A. For this reason, in the present embodiment, the heights of the lower ends of the two stopping pins 62 are kept constant. The diameter of the guide hole H2 (H3) that accommodates the stop pin 62, that is, the diameter of each stop pin 62 is larger than that of the guide holes H1 and H4, that is, the positioning pins 63 described above. The reason is that the object body BD pushed by the operator is brought into contact with the floor fixing portion 71 and stopped before positioning, and it is necessary to have sufficient strength. It is necessary to prevent the apparatus main body BD from colliding with the dental treatment chair 2 due to inertia or the like.

  Furthermore, the floor fixing | fixed part 71 is demonstrated with reference to FIGS. The floor fixing portion 71 is a horizontally long member made of resin or metal, and is fixed to the floor surface F near the headrest when the backrest of the dental treatment chair 2 is tilted with screws or the like. The floor fixing portion 71 is configured such that a cross section thereof in the horizontal direction, that is, the Z-axis direction here is shown in FIG. As can be seen from the figure, a gentle slope 71A starts from the front end, and a long groove 71B dug shallowly along the longitudinal direction, that is, the X-axis direction in this case, lies at the back (see FIG. 12). Two positioning holes 71C that are further dug from the bottom surface are formed at two locations in the longitudinal direction of the long groove 71B. The interval between the two positioning holes 71C is the same as the interval between the two positioning pins 63 described above.

  Further, the long groove 71B follows the steep contact surface 71D with which the stop pin 62 can contact, and the contact surface 71D passes through the top portion 71E and falls to the back side, that is, the dental treatment chair 2 side and ends. . The bending state of the steep slope 71D is matched with the bending shape of the tip portion of the stop pin 62 as described above.

  The output signals of the three hall sensors 111A, 111B, and 111C described above are sent to the control circuit of the power supply box 13. For example, as shown in FIG. 14, the control circuit includes a processor 120 constituted by a CPU. The processor 120 turns on / off the red, yellow, and blue LEDs 121A, 121B, and 121C depending on which Hall sensor has an output signal and the detection state thereof. These LEDs 121A, 121B, and 121C are installed, for example, at the upper end portion of the back surface portion 14B of the main body BD. When receiving an output signal from the first hall sensor 111A, the processor 120 turns on the red LED 121A and turns off the remaining LEDs 121B and 121C. Further, when receiving an output signal from the second hall sensor 111B, the processor 120 turns on the yellow LED 121B and turns off the remaining LEDs 121A and 121C. Similarly, when an output signal is received from the third hall sensor 111C, the blue LED 121C is turned on and the remaining LEDs 121A and 121B are turned off.

  The panorama photographing apparatus 1 according to the present embodiment is configured as described above. For this reason, various effects are exhibited as described below.

  First, since this panoramic imaging device 1 is configured to be portable, it can be easily moved by a dentist or a nurse. When positioning the panoramic imaging device 1 on the back side of the dental treatment chair 2, the dentist or nurse holds the back handle 54 and pushes the device 1 while keeping the guide pole 59 along the guideline GL. That's fine. The tip of the guide line GL reaches the center position C in the longitudinal direction of the floor fixing portion 71 on the floor surface F (see FIG. 12). This center position C is matched with the lateral center position of the headrest when the backrest of the dental treatment chair 2 is tilted.

  And when it seems that the front-end | tip part of the positioning mechanism part 61 of this apparatus 1 reached the floor fixing | fixed part 71, it advances further, reducing the speed to push a little. Accordingly, the two stop pins 62 discharged from the lower surface of the positioning mechanism portion 61 by the predetermined height L2 come into contact with the contact surface 71D of the floor fixing portion 71. Since the floor fixing unit 71 is fixed to the floor surface F, the panorama photographing apparatus 1 also stops by contacting the contact surface 71D (see FIG. 9). At this time, the tips of the two positioning pins 63 are in the storage position Q1 (see FIG. 11), and are positioned directly above the long groove 71B of the floor fixing portion 71. At this time, since the red LED 121A is lit by the output signal of the first hall sensor 111A, it can be notified that the positioning has not been performed yet.

  When the conveyance is finished, the operator tilts the operation lever 52 from the initial position P1 to the intermediate position P2. In response to this, the wire 86 is pushed (loosened) and the rotating arm 105 is also rotated forward (see arrow A in FIG. 9), the elastic force of the spring 93 is won, and the two positioning pins 63 are moved downward. Pressed. As a result, the two positioning pins 63 are dropped into the long groove 71 </ b> B of the floor fixing portion 71. That is, the lower end of the positioning pin 63 shifts from the storage position Q1 shown in FIG. 11 to the first-stage lowering position Q2. In response to this, the yellow LED 121B is turned on by the output signal of the second hall sensor 111B. This informs the operator that the positioning has not yet been done, but that the first stage of positioning has been completed.

  Therefore, the operator tilts the operation lever 52 from the intermediate position P2 to the fixed position P3. In response to this, the wire 86 is further loosened and the rotating arm 105 is further rotated forward (see arrow A in FIG. 9), and the two positioning pins 63 are further pushed downward. At this time, if the positions of the tip portions of the two positioning pins 63 coincide with the two positioning holes 71C at the bottom of the long groove 71B, the pins 63 are directly dropped into the positioning holes 71C (see FIG. 11). (Refer to the lower position Q3 of the second stage). In this lowered state, the positioning mechanism portion 61 is locked to the floor fixing portion 71 by the urging force of the spring 93. When in this locked state, the spring 93 is substantially fitted in the positioning hole 71C and exerts a force to stretch against the floor surface F. Accordingly, the apparatus main body BD, that is, the panorama photographing apparatus 1 is positioned by the position of the floor fixing unit 71. That is, the panoramic imaging apparatus 1 is positioned in a fixed state with respect to the dental treatment chair 2 at a predetermined position. At this time, since the output signal of the third hall sensor 111C becomes valid, the blue LED 121C is lit. Thereby, the completion of positioning is notified.

  However, the tip end portions of the two positioning pins 63 may slightly deviate from the positions of the two positioning holes 71C in the above-described drop-in stage. In such a case, the operator may hold the back handle 54 or the side handle 55 and slightly move the apparatus main body BD left and right. Thereby, a pin position that matches the position of the positioning hole 71C can be found. If the positions are adjusted in this way, the operating lever 52 is already in the fixed position P2 and the urging force of the spring 93 is acting, so the two positioning pins 63 automatically click into the two positioning holes 71C. Locked in. That is, the positioning pin 63 changes from the first-stage lowered position Q2 to the second-stage lowered position Q3 shown in FIG. As a result, the blue LED 121C is lit and positioning is completed.

  Next, the scattered radiation shielding cover 14 </ b> C is retracted rearward (see the imaginary line “retraction position” in FIG. 3). At this stage, the X-ray tube arm 21 and the detector arm 22 are positioned at their initial positions. Therefore, the dentist (or operator) positions the head H of the patient P at a predetermined position in the imaging space S while tilting the backrest of the dental treatment chair 2. This positioning is performed by adjusting the height direction of the elevator 14 and This is done by positioning the midline, frankfurt, and canine with three laser beams (not shown).

  After this patient positioning, the scattered radiation shielding cover 14C is moved to the forward imaging position (see the solid line “imaging position” in FIG. 3). As a result, as shown by the solid line in FIG. 3, the head H of the subject P is positioned in the defined imaging space S. In this state, when the dentist presses the irradiation switch 58 from a position slightly away, the panoramic imaging described above is activated and data is collected.

  When the data collection is completed, the subject P is released from the imaging space S by opening the scattered radiation shielding cover 14C (retracted position) and returning the backrest of the dental treatment chair 2 to the original position. Next, the scattered radiation shielding cover 14 </ b> C is closed (imaging position), and the panorama imaging apparatus 1 is moved to another location. At this time, the operation lever 52 may be continuously returned to the fixed position P3, the intermediate position P2, and the initial position P1. As a result, the wire 86 and the rotating arm 105 are returned (see arrow B in FIG. 9), and the positioning pin 63 returns to the initial position against the elastic force of the spring 93 to take the storage position Q1. In response to this, the red LED 121A is turned on. Thereby, since the apparatus main body BD is released from the floor fixing | fixed part 71 (unlocking), the apparatus 1 can be moved to another place.

  As described above, in the panorama photographing apparatus 1, the panoramic photographing apparatus 1 can be freely moved and can be reliably and accurately positioned with respect to the dental treatment chair 2. At the time of this positioning, the apparatus main body BD is surely stopped first using the stop pin 62, so that the subsequent positioning can be performed easily and quickly. Furthermore, when accessing the dental treatment chair 2, the operator can obtain a guide function using the guide pole 59 and the guide line GL, so that the operations up to positioning are facilitated. Furthermore, since the pin state until the positioning is completed can be monitored by the LED, the operator can improve the positioning work efficiency.

  By the way, in the case of this panoramic imaging apparatus 1, the X-ray XB emitted from the X-ray tube 23 is always limited to the size of the X-ray incident window WD of the detector 24. In addition, the X-ray tube 23 and the detector 24 are driven and controlled independently by the four axes, and both are always opposed to each other via the jaw of the subject P during scanning. For this reason, the X-ray XB irradiated from the X-ray tube enters the detector 24. Therefore, the amount of scattered radiation leaking from the imaging space S is small. In particular, since the X-ray XB rotates around the axis C in the front-rear direction, the amount of scattered radiation leaking in the front-rear direction of the imaging space S is further reduced.

  In addition, in the case of the present embodiment, the top surface, both side surfaces, and the bottom surface that define the imaging space S are surrounded by the above-described scattered radiation shielding cover 14C and the scattered radiation shielding plate 20 of the bottom surface portion 14C. X-ray shielding is provided. For this reason, X-rays leaking outside from the imaging space S during panoramic imaging or partial imaging can be reliably reduced or shielded. Thereby, even when panoramic imaging or partial imaging driven by the X-ray tube 23 is performed, the influence of X-rays on the outside of the imaging space S can be almost ignored.

  This panorama photographing apparatus 1 is movable. Therefore, it is possible to provide a panoramic imaging apparatus having an X-ray shielded space that should be called a “portable dental X-ray shield room”. Thereby, X-ray imaging | photography of a jaw part can be performed with the patient lying in the dental treatment chair on its back. Leakage to the outside from a very localized small imaging space around the jaw during the imaging can be greatly reduced.

For the subject, the head H is placed in the scattered radiation shielding cover 14C. The cover 14C is provided with a translucent portion 14TR. For this reason, the outside can always be seen, and patients who are not good at closing can cope with it.
(Other embodiments)
In the case of the above-described embodiment, when the apparatus main body BD of the panoramic photographing apparatus 1 is moved to the dental treatment chair 2, the operator uses the guideline GL and the guide pole 59 as a guide. Various embodiments of the guide function are possible. For example, as shown in FIG. 2, a plurality of intersecting lines GLs such as “long”, “medium”, and “short” intersecting the linear guideline GL can be pasted at predetermined positions. The positioning pin 63 is set to be directly above the long groove 71B of the floor fixing portion 71 when the reference pole 59 reaches just above the shortest intersection line of the intersection line GLs. Therefore, when the guide pole 59 reaches the long intersection line GLs, the operator can surely know that the distal end portion of the apparatus main body BD is close to the dental treatment chair 2 and can surely enter the slow running system. . Therefore, the apparatus main body BD can be reliably positioned on the floor fixing portion 71.

  As shown in FIG. 15, a transmission / reception unit 131 that transmits and receives a medium such as a laser and an ultrasonic wave in a non-contact manner with the guide line GL may be provided in a part of the positioning mechanism unit 61. By processing the output signal of the transmission / reception unit 131 by, for example, the processor 120, the distance information to the floor fixing unit 71 can be known by voice or light. Furthermore, as shown in FIG. 16, a small camera 132 for photographing the front may be provided on the front surface of the positioning mechanism unit 61. This captured image may be displayed on a display (not shown) provided near the operation lever. According to these means 131 and 132, it is possible to reliably detect the front floor fixing portion 71, which is difficult to see, and greatly assists in positioning.

  In the case of the panoramic photographing apparatus 1 described above, the hall sensor is provided as a sensor indicating the pressing state of the positioning pin 63, but this may be another sensor. For example, a non-contact sensor such as an optical sensor may be used, or a physical contact sensor may be used. Further, the installation position of the sensor is not necessarily limited to the above-described embodiment, and may be a place where the movement of the positioning pin 63 can be detected. For example, a non-contact sensor or a contact sensor can be embedded on the floor fixing portion 71 side, the arrival of the positioning pin 63 being pushed in can be detected, and the detection signal can be sent wirelessly to the apparatus body BD. Thereby, the detection operation equivalent to embodiment mentioned above can be performed.

  Further, a mechanism that omits the stop pin 62 in the panorama photographing apparatus 1 described above may be employed. In that case, it is desirable that the positioning pin also has a stopper function, and accordingly, a deformation such as increasing the diameter of the pin or increasing the number of pins to three or more is desirable.

  Further, only the positioning hole 71C may be provided in the floor fixing portion 71. That is, a structure in which the long groove 71B is not formed may be employed. In this case, the positioning pin 63 simply moves up and down in two stages. In this case, the operation position of the operation lever 52 also takes the two-stage operation position of an initial position P1 (90 ° tilt position) and a fixed position P3 (0 ° tilt position) in FIG. For this reason, when the tip of the positioning pin 63 that has been lowered in response to the tilting operation to the fixing position P3 on the operation lever 52 is aligned with the positioning hole 71C, it is directly fitted into the hole 71C and locked. The However, if they do not match, the tip of the positioning pin 63 stops around the upper end of the positioning hole 71C. In this case, the operator can find the positioning hole 71C by holding the back handle 54 or the side handle 55 and slightly moving the apparatus main body BD left and right. When the positioning hole 71C is located, the positioning pin 63 is automatically lowered by the elastic force of the spring 93, and is locked as described above. For this reason, when adopting the structure for performing the two-stage operation, the opening at the upper end of the positioning hole 71C may have a slightly wider diameter and may be tapered so as to reduce the diameter.

  Further, the number of positioning pins 63 is not necessarily two, and may be three or more. Further, when the two positioning pins 63 are provided as in the above-described embodiment, the distance between the pins may be separated and positioned at both ends in the width direction of the apparatus main body BD, that is, in the X-axis direction.

  Further, in the case of a structure employing only the positioning pin 63, the positioning hole 71C may be directly formed in the floor surface F without providing the floor fixing portion 71 depending on the structure of the floor surface F. In this case, a removable lid may be attached to prevent dust and the like from accumulating in the positioning hole 71C when not in use.

  Depending on the structure of the floor surface F, the above-described floor fixing portion 71 itself may be detachably attachable to the floor surface F.

  On the other hand, in the embodiment and the modification described above, the caster 11 is provided as a moving unit that moves the main body BD (except the console) of the apparatus 1. However, this moving means is not limited to casters. A gripping portion may be provided on the main body of the apparatus 1, and the gripping portion may be held and moved by hand. Moreover, you may provide the wheel which rotates electrically on the lower surface of the base part 12. FIG. Any means capable of freely moving the main body BD of the apparatus 1 according to the present application to the side of the dental treatment chair 2 may be used.

  The present invention is not limited to the configurations shown in the above-described embodiments and modifications, and can be implemented with various modifications without departing from the gist of the claims.

1 Dental panoramic imaging device 11 Casters (moving means)
12 Base 14 Elevator 14B Back 14C Scattered ray shielding cover 14D Bottom 15 Console 20 Scattered ray shielding plate 21 X-ray tube arm 22 Detector arm 23 X-ray tube 24 Detector 52 Operation lever 61 Positioning mechanism 62 Stopping pin 63 Positioning pin 71 Floor fixing part (fixing frame)
71B Long groove 71C Positioning hole 81 Lever drive part 91 Pin cover

Claims (11)

An X-ray tube that irradiates the subject's head positioned on the side of the dental treatment chair and lying on his back on the chair while irradiating X-rays while rotating around the head, and rotating around the head In a portable dental X-ray imaging apparatus provided with a detector that detects the X-ray transmitted through the head,
An operation unit operated by an operator;
A transmission means for transmitting an operation given to the operation unit;
Position specifying means for specifying a predetermined position when the X-ray imaging apparatus is laid on the chair;
A fixing means for locking the X-ray imaging apparatus at the predetermined position by locking the position specifying means according to the operation transmitted by the transmission means;
An X-ray imaging apparatus comprising: The position specifying means is a fixed frame fixed at the predetermined position on the floor close to the chair,
The fixing means includes a pin protruding in response to the operation transmitted by the transmission means, and a pin driving mechanism for driving the pin and locking the pin to the fixing frame.
The X-ray imaging apparatus according to claim 1.   The X-ray imaging apparatus according to claim 2, wherein a hole into which the pin is inserted is formed in the fixed frame. The operation unit is an operation lever that can be manually operated by an operator,
The operation lever can be operated in a step-by-step manner in order from the initial position when the operation lever is not operated and the operator from the initial position to the three-stage operation positions of the first stage and the second stage. It has a structure that takes two lever positions and can be returned in the reverse order,
The pin is urged by the operation of the operation lever from the initial position to the first-stage lever position and protrudes as a first stage, and the second-stage lever from the first-stage lever position. A positioning pin that is urged by the operation to a position and protrudes as a second stage;
The fixed frame has a long groove into which the pin protruding in the first stage is inserted, and a hole portion which is formed in the bottom surface of the long groove and into which the pin protruded in the second stage is inserted. The X-ray imaging apparatus according to claim 2.   5. The X-ray according to claim 4, wherein the positioning pin includes a plurality of pins, and is held so as to protrude downward from a lower portion of a front surface of the X-ray imaging apparatus by the pin driving mechanism. Shooting device. The fixing means includes a stop pin,
The fixed frame is oriented in a direction to allow the X-ray imaging apparatus to access the dental treatment chair in a state where the fixed frame is fixed to the floor, and the stop is received by the contact of the stop pin. Has a stopper surface to stop the forward movement of the pin
The X-ray imaging apparatus according to claim 4, wherein the hole is formed at a position continuous with a lower end of the stopper surface.   The X-ray imaging apparatus according to claim 6, wherein the positioning pins and the stopping pins are aligned in a horizontal line. The positioning pin and the stop pin are each composed of two pins,
The X-ray imaging apparatus according to claim 6, wherein the hole portion includes two hole portions that can be fitted into the two positioning pins.   The X-ray according to any one of claims 1 to 8, wherein the transmission means includes a wire that transmits an operation force of an operator applied to the operation lever to the pin drive mechanism. Shooting device. An X-ray tube arm that rotatably holds the X-ray tube around a specific part of the subject;
A detector arm that rotatably holds the detector around the specific part;
An imaging space for rotatably holding the X-ray tube arm and the detector arm and allowing the X-ray tube arm and the detector arm to rotate around the imaging region of the subject is provided. An elevator to
A pedestal part equipped with this elevator,
A moving support means attached to the pedestal portion and movably supporting the device;
The X-ray imaging apparatus according to any one of claims 1 to 9, further comprising:   The X-ray imaging apparatus according to claim 10, further comprising a shielding body that is positioned so as to define the imaging space and is formed of a shielding material that shields the X-ray.

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