Abstract:
The present invention relates to an X-ray photographing device and, more specifically, to an X-ray photographing device comprising a variable type arm which can irradiate, without limitation of location or direction, X-rays to a subject using the variable type arm of which the length and rotation angle of joints, etc. are variable.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to an X-ray radiography device and, more particularly, to an X-ray radiography device having a variable arm that can radiate X-rays to a subject without limitations on position or direction, using a variable arm that can change in length and rotational angle of joints. 
       BACKGROUND ART 
       [0002]    An X-ray radiography device obtains a radiograph by radiating a predetermined amount of X-rays, which are generated by an X-ray generator, to a predetermined portion of a body to be radiographed, sensing the amount of X-ray passing through the portion by means of an X-ray sensing unit, and calculating X-ray absorption ratios of predetermined points in the portion of the body. In the X-ray radiography device, the X-ray generator needs be easily changed in position and direction to face desired portions of a subject and the position and direction need to be fixed while an X-ray is generated after they are determined. 
         [0003]      FIG. 1  shows an X-ray radiography device having a plurality of arms in the related art. The X-ray radiography device  10  of the related art, as shown in  FIG. 1 , includes a body  11  that is fixed to a wall or other equipment and an X-ray generator  12  that radiates an X-ray to a subject, in which they are connected through an arm assembly  20  having a plurality of joints. A power supply and a control panel are disposed at the body  11 , while an X-ray emitter and a collimator are disposed at the X-ray generator  12 . An X-ray sensing unit (not shown) may be provided inside or outside a subject  12  that the X-ray generator  12  faces. 
         [0004]    The arm assembly  20  is formed by connecting a plurality of unit arms  21 ,  22 ,  23 , and  24 . Adjacent unit rams  21 ,  22 ,  23 , and  24  are connected by various joints so that they can rotate about rotational shafts a 1 ˜a 7 , respectively, within the range of 0 to 180 degrees. The unit rams  21 ,  22 ,  23 , and  24  and the joints function as paths for a power supply line and signal lines connecting the body  11  and the X-ray generator  12 . 
         [0005]    In order to perform radiography using the X-ray radiography device  10 , for example, for dental examination and treatment, a user puts the X-ray sensing unit, which is called an intraoral X-ray sensor, inside the mouth of a patient and has to operate the arm assembly  20  so that the X-ray generator  12  faces the X-ray sensing unit. In particular, patients have different sizes, so the user has to appropriately configure the X-ray generator every time toward the desired portions to radiograph of the patient. However, it is difficult to control the position and direction of the X-ray generator  12  by operating the arm assembly  20 . This is because it is required to consider the lengths of the unit arms  21 ,  22 ,  23 , and  24  of the arm assembly  20  and the rotational characteristics of the joints should avoid interference with the body of a patient. Further, considering the weight of only the X-ray generator  12  is around 10 kg, it is hard for a user to move the arm assembly  20  supporting the arm. 
         [0006]    Further, in terms of manufacturing the device, the structure is complicated due to the plurality of unit arms and joints, and the manufacturing cost and the percent defective are easily increased and the reliability is easily deteriorated in proportion to the number of the parts. 
       DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem 
       [0007]    The present invention has been made in an effort to solve the problems and an object of the present invention is to provide an X-ray radiography device that has a variable arm that enables a user to easily move and turn an X-ray generator, has a high degree of freedom in motion, and has a simple structure. 
       Technical Solution 
       [0008]    In order to achieve the object, the present invention provides an X-ray radiography device that includes: a radiographing body including an X-ray generator; and a variable arm relatively changing a position and a direction of the radiographing body with respect to a temporarily fixed position, in which the variable arm includes: a variable connection member configured to change in length or direction by an external force; a fixed end configured to be an end of the variable connection member and fixed at at least the temporarily fixed position; and a free end configured to be an opposite end to the fixed end, be connected to the radiographing body, and to be changed in position and direction relative to the fixed end with transformation of the variable connection member. The fact that the fixed end is at least temporarily fixed means that an object to which the fixed end is fixed may be a permanently fixed structure such as a wall, or that the fixed end is fixed to other equipment, furniture, or an object that can move but maintains a fixed position during radiography such that a patient can be radiographed. 
         [0009]    In an embodiment, the variable connection member may be a variable corrugated pipe that being partially freely changeable by the external force and may have a space through which a cable passes. 
         [0010]    In an embodiment, the variable corrugated pipe may include a plurality of gooseneck arms having different thicknesses and being connected to each other. 
         [0011]    In an embodiment, the gooseneck arms may include: a first gooseneck arm reinforced by a first reinforcing layer, which is made of a metal or a synthetic resin having a first thickness (t 1 ) (t 1 &gt;0) on an inner side thereof; and a second gooseneck arm reinforced with a second reinforcing layer made of the metal or the synthetic resin having a second thickness (t 2 ) (t 1 &gt;t 1 &gt;0) on an inner side thereof. 
         [0012]    In an embodiment, flexibility of the variable connection member may increase along a direction from the fixed end to the free end. 
         [0013]    In an embodiment, the variable connection member may be a multi-stepped arm including multi-stepped pipes having different diameters to be stretched or contracted for a length adjustment. 
         [0014]    In an embodiment, the X-ray radiography device may further include a fixed body connected to the fixed end, to be fixed to an external structure, and having a power supply therein, and a cable connecting the fixed body and the radiographing body to each other and connected through an inside space of the variable connection member. 
         [0015]    In an embodiment, the free end may be separable from the radiographing body, the fixed end may be separable from the fixed body, and the variable connection member may be longitudinally partially open or cut to take out the cable. 
         [0016]    In an embodiment, when the variable connection member is separated from the cable, the cable may be put into the fixed body. 
         [0017]    In an embodiment, the X-ray radiography device may further include a cable exit disposed at the fixed end to take out a cable inserted in the variable connection member. 
         [0018]    In an embodiment, the X-ray radiography device may further include a clamp connected to the fixed end and to be fixed to an external structure. 
         [0019]    In an embodiment, the X-ray radiography device may further include a body support connected to the fixed end and placed on a portion of a body of a patient who is a subject to be radiographed. 
         [0020]    In an embodiment, the body support may be a shoulder support or a headrest. 
         [0021]    In an embodiment, the X-ray generator may include a field emission type of electron emitter using a nano-scaled emitter. 
         [0022]    In an embodiment, the radiographing body may be detachably or rotatably connected to the variable arm. 
       Advantageous Effects 
       [0023]    According to the present invention, it is possible to provide an X-ray radiography device that enables a user to easily move and turn an X-ray generator, has a high degree of freedom in motion, and has a simple structure. 
         [0024]    Therefore, it is possible to provide a product that can be very conveniently used by a user, to improve reliability and reduce the manufacturing cost by simplifying the structure, and to improve mobility by reducing the weight of the X-ray radiography device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]      FIG. 1  shows an X-ray radiography device having a plurality of arms in the related art. 
           [0026]      FIG. 2  is a view showing an X-ray radiography device according to a first embodiment of the present invention. 
           [0027]      FIG. 3  is a view showing an X-ray radiography device according to a second embodiment of the present invention. 
           [0028]      FIG. 4  is a view showing an example of using the X-ray radiography device according to the embodiment shown in  FIG. 3 . 
           [0029]      FIG. 5  is a view showing an X-ray radiography device according to a third embodiment of the present invention. 
           [0030]      FIG. 6  is a view showing an example of using the X-ray radiography device according to the embodiment shown in  FIG. 5 . 
           [0031]      FIG. 7  is a view showing an X-ray radiography device according to a fourth embodiment of the present invention. 
           [0032]      FIG. 8  is a view showing an X-ray radiography device according to a fifth embodiment of the present invention. 
           [0033]      FIG. 9  is a view showing an X-ray radiography device according to a sixth embodiment of the present invention. 
           [0034]      FIGS. 11 to 13  are views showing an X-ray radiography device according to a seventh embodiment of the present invention. 
           [0035]      FIGS. 14 to 15  are views showing an X-ray radiography device according to an eighth embodiment of the present invention. 
           [0036]      FIGS. 16 to 18  are views showing an X-ray radiography device according to a ninth embodiment of the present invention. 
           [0037]      FIGS. 19 to 20  are views showing an X-ray radiography device according to a tenth embodiment of the present invention. 
           [0038]      FIGS. 21 to 23  are views showing an X-ray radiography device according to an eleventh embodiment of the present invention. 
           [0039]      FIGS. 24 to 26  are views showing an X-ray radiography device according to a twelfth embodiment of the present invention. 
           [0040]      FIGS. 27 to 31  are views showing an X-ray radiography device according to thirteenth embodiment of the present invention. 
           [0041]      FIG. 32  is a view showing a radiographing body of the X-ray radiography device according to the ninth embodiment of the present invention. 
           [0042]      FIG. 33  is a view showing the radiographing body of  FIG. 32  with first and second bodies moved. 
           [0043]      FIG. 34  is a view when an X-ray generator is mounted on the first body of the radiographing body of  FIG. 32 . 
           [0044]      FIG. 35  is a view schematically showing radiography using the radiographing body of  FIG. 34 . 
           [0045]      FIG. 36  is a view when an X-ray generator is mounted on the second body of the radiographing body of  FIG. 32 . 
           [0046]      FIG. 37  is a view showing a handy type X-ray radiography device having a curved X-ray sensing unit of the radiographing body of  FIG. 32 . 
       
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
       [0047]    Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments may be modified in various ways and the range of the present invention is not limited to the following embodiments. Embodiments of the present invention are provided to clearly give the technical spirit of the present invention to those skilled in the art. 
         [0048]      FIG. 2  is a view showing an X-ray radiography device according to a first embodiment of the present invention. An X-ray radiography device  101  according to this embodiment includes a radiographic variable arm  120 , a fixed body  110 , and a radiographing body  130 . The fixed body  110  is fixed to an external structure such as a wall or other equipment and includes a power supply therein. The radiographic variable arm  120  has: a variable connection member  124  that is a variable corrugated pipe having a predetermined length and being freely partially changeable by external force and provides a space therein through which a cable can pass; a fixed end  121  that is one end of the variable connection member  124  and fixed to the fixed body  110 , and a free end  122  that is an opposite end to the fixed end  121  of the variable connection member  124  and is changed in position and direction relative to the fixed end  121  with transformation of the variable connection member  124 . The free end  122  is connected to the radiographing body  130 . The fixed end  121  may rotate about an axis b 1  with respect to the fixed body  110  and the free end  122  may rotate about an axis b 2  with respect to the radiographing body  130 . 
         [0049]    A variable corrugated pipe made of metal such as stainless steel may be used for the variable connection member  124 . When force over a predetermined level is applied perpendicularly to the longitudinal direction of the variable connection member  124 , the portion receiving the force is transformed, or when a force is not applied or a force less than a predetermined level is applied, the variable connection member  124  maintains the shape. Accordingly, a variable corrugated pipe that is transformed by force applied transversely (perpendicularly to the longitudinal direction) over a predetermined level larger than the weight of the radiographing body  130  may be used for the variable connection member  124 . As long as satisfying this condition, the part used for a microphone stand may be used, for example. 
         [0050]    In this embodiment, the fixed end  121  and the free end  122  are short pipes without wrinkles coupled to both ends of the variable connection member  124 . This structure is advantageous in connection to the fixed body  110  and the radiographing body  130 . However, the present invention is not limited to this structure. The fixed end  121  and the free end  122  may be not separate members, but both end portions of the variable connection member  123 . 
         [0051]    The radiographic variable arm  120  composed of the variable connection member  124 , the fixed end  121 , and the free end  122  provides a passage through which a cable can be connected from the fixed end  121  to the free end  122 . The fixed body  110  is connected to an external power supply terminal or may have a power supply including a battery, whereby power can be supplied to the radiographing body  130  through the cable. Further, a control panel that can control the X-ray generator in the radiographing body  130  may be disposed in the fixed body  110 , in which a cable for transmitting control signals may be connected through the radiographic variable arm  120 . 
         [0052]    The radiographing body  130  includes an X-ray generator at a portion thereof and may further include a collimator  133  that controls the radiation range of an X-ray from the X-ray generator. In the X-ray radiography device  101  according to this embodiment, it is advantageous that the radiographing body  130  is light, and the weight may be within about 1 kg. To this end, the X-ray generator may be equipped with a field emission type of electron emitter, which uses a nano-structure material such as a carbon nanotube, and an X-ray target. 
       Mode for Invention 
       [0053]      FIG. 3  is a view showing an X-ray radiography device according to a second embodiment of the present invention. An X-ray radiography device  102  according to this embodiment may further include a clamp  112  that is coupled to the fixed end  121  of the radioscopic variable arm  120  to be fixed to an external structure, in addition to the configuration of the X-ray radiography device  101  according to the first embodiment. The clamp  112  may be coupled in advance to the fixed body  110  of the X-ray radiography device  102 . The clamp  112  may be fixed in various ways, for example, by screws or elastic members such as forceps. Other configurations of the X-ray radiography device  102  according to this embodiment are the same as that of the X-ray radiography device  101  according to the first embodiment. 
         [0054]      FIG. 4  is a view showing an example of using the X-ray radiography device according to the embodiment shown in  FIG. 3 . The X-ray radiography device  102  according to this embodiment may be fixed for use to a common movable stand  30  that is generally used for holding the containers of ringer&#39;s solution. Although the clamp  112  is held on the handle of the movable stand  30  in this embodiment, it may be fixed to the bar of the stand. 
         [0055]      FIG. 5  is a view showing an X-ray radiography device according to a third embodiment of the present invention. An X-ray radiography device  103  according to this embodiment further includes, in addition to the configuration of the X-ray radiography device  101  according to the first embodiment, a clamp  112  that is coupled to the fixed end  121  of the radiographic variable arm  120  to be fixed to an external structure, as in the second embodiment, and further includes a cable exit  123  disposed at the fixed end  121  of the variable arm  120  to take out a cable  115  inserted in the variable arm  120 . The cable  115  may be connected to the fixed body  110  separated from the radiographic variable arm  120 . Other configurations of the X-ray radiography device  103  according to this embodiment are the same as that of the X-ray radiography device  101  according to the first embodiment. 
         [0056]      FIG. 6  is a view showing an example of using the X-ray radiography device according to the embodiment shown in  FIG. 5 . The X-ray radiography device  102  according to this embodiment may be fixed for use to a dental unit chair  40  that is generally used in dental clinics. Although the clamp  112  is disposed on an armrest  41  of the dental unit chair  40  in this embodiment, it may be fixed to other portions. Further, the fixed body  110  may be separated from the radiographic variable arm  120  and installed at a fixed structure such as a shelf of the dental unit chair  40  and may be connected through the cable  115  coming out of the cable exit. 
         [0057]      FIG. 7  is a view showing an example of using the X-ray radiography device according to a fourth embodiment and  FIG. 8  is a view showing an example of using an X-ray radiography device according to a fifth embodiment. X-ray radiography devices  104  and  105  according to the fourth and fifth embodiments may further include a body support that is connected to the fixed end  121  of the radiographic variable arm  120  and is placed on a portion of the body of a patient H who is the subject to be radiographed. In the X-ray radiography device  104  according to the fourth embodiment, a shoulder support  113 , which is placed on the shoulders of the patient H as an example of the body support, is connected to the fixed end  121  of the radiographic variable arm  120 . In the X-ray radiography device  105  according to the fifth embodiment, a headrest  50 , which is placed on the head of the patient H as another example of the body support, is connected to the fixed end  121  of the radiographic variable arm  120 . The headrest  50 , which is a part connected to the dental treatment equipment  52  in the related art, may be the part included in the dental treatment equipment  52  in the related art. The cable  115  taken out of the radiographic variable arm  120  may be connected to the fixed body  110  that is separately installed. 
         [0058]      FIG. 9  is a view showing an X-ray radiography device according to a sixth embodiment of the present invention. An X-ray radiography device  16  according to this embodiment is the same as the X-ray radiography device  101  according to the first embodiment in terms of the radiographic variable arm  120 , but is different in the configuration of a radiographing body  140 . In this embodiment, the radiographing body  140  may further include a first body  143  in which any one of an X-ray generator and an X-ray sensing unit is disposed, a second body  141  in which the other one of the X-ray generator and the X-ray sensing unit is disposed, and a connection frame  145  connecting the first and second bodies. The positions of the X-ray generator  141  and the X-ray sensing unit  143  may be exchanged on the connection frame  145 . 
         [0059]    It is advantageous for the radiographing body  140  be light and the weight may be within about 1 kg. To this end, the X-ray generator may be equipped with a light electron emitter such as a field emission type of electron emitter, which uses a carbon nanotube, and an X-ray target. 
         [0060]    The radiographing body  140  of the X-ray radiography device  106  according to this embodiment will be described in a corresponding part below. 
         [0061]    The X-ray radiography devices  101  to  106  according to the embodiments may be modified in various ways, that is, for example, the cable for supplying power to the radiographing bodies  140  and  130  may be connected to the fixed body  110  not through the inside of the radiographic radio corrugated arm  120  or may be connected to the power supply of existing equipment or a movable battery pack. When a power circuit is disposed in the radiographing bodies  140  and  130 , it may be connected directly to an external power terminal. Further, the radiographing bodies  140  and  130  may be separably connected to the free end  122  of the radiographic variable corrugated arm  120 , and when they are separated, the cable  115  may extend out of the variable connection member  124 . To this end, the cable  115  may be elastically wound in the radiographic variable corrugated arm  120  or the fixed body  110  to be pulled out when the radiographing bodies  140  and  130  are pulled away from the free end  122 . 
         [0062]      FIGS. 10 to 13  are views showing an X-ray radiography device according to a seventh embodiment of the present invention. In an X-ray radiography device  107  according to this embodiment, a variable connection member  124  may be a multi-stepped arm including multi-stepped pipes, and the other configuration is the same as that of the X-ray radiography device  101  according to the first embodiment. 
         [0063]    Further, the X-ray radiography device  170  according to the seventh embodiment can be changed in length, but is limited in control of the angle of the radiographing body  130 , as compared with the X-ray radiography device  101  according to the first embodiment. 
         [0064]    Accordingly, a semispherical portion with an empty internal space may be formed at an end of the variable connection member  124  and a coupling ball may be formed at the radiographing body  130  so that the variable connection member  124  can tilt with them coupled. 
         [0065]    Further, the variable connection member  124  and the radiographing body  130 , and the variable connection member  124  and the fixed body  110  may be detachably or rotatably combined in well-known types, for example, by thread-fastening or fitting, and terminals may be disposed therein and coupled to each other to supply power or transmit predetermined control signals. 
         [0066]    Further, though not shown, a cable reel for winding or unwinding a cable may be disposed in the fixed body  110  so that the cable inside can be moved when the multi-stepped arm is stretched or contracted. 
         [0067]    That is, it is possible to prevent damage to the cable inside even if the variable connection member  124  changes in length. 
         [0068]      FIGS. 14 to 15  are views showing an X-ray radiography device according to an eighth embodiment of the present invention. In an X-ray radiography device  108  according to this embodiment, the variable connection member  124  is a variable corrugated pipe, and a semispherical portion with an empty inside is formed at an end of the variable connection member  124  and a coupling ball is formed at the radiographing body  130  so that the variable connection member  124  can tilt with free rotation with them coupled. 
         [0069]    That is, this embodiment has the advantage that, as compared with the variable arm  120  according to the first embodiment, it is possible to more smoothly move the variable arm with a higher degree of freedom and there is little limitation in radiation position and angle of X-rays. 
         [0070]      FIGS. 16 to 18  are views showing an X-ray radiography device according to a ninth embodiment of the present invention. In an X-ray radiography device  109  according to this embodiment, the variable connection member  124  is composed of a plurality of gooseneck arms  124   a,    124   b,  and  124   c,  and the other configuration is substantially the same as the X-ray radiography device  101  according to the first embodiment. 
         [0071]    The gooseneck arms  124   a,    124   b,  and  124   c  may have different thicknesses. 
         [0072]    In detail, the gooseneck arms  124   a,    124   b,  and  124   c  may include a first gooseneck arm  124   c  that is thickest, a second gooseneck arm  124   b  that is secondarily thick, and a third gooseneck arm  124   a  that is thinnest. 
         [0073]      FIG. 17  is a cross-sectional view taken along line A-A in  FIG. 16 , in which the first gooseneck arm  124   c  may be reinforced on the inner side by a first reinforcing layer  124   c ′ made of metal or synthetic resin and having a predetermined thickness t 1  and may be coupled to the fixed body  110  where it is supposed to bend less. 
         [0074]    Next, a second reinforcing layer  124   b  made of metal or synthetic resin and having a thickness t 2  smaller than that of the first reinforcing layer  124   c ′ of the first gooseneck  124   c  is disposed on the inner side of the second gooseneck arm  124   b.    
         [0075]    On the other hand, the third gooseneck arm  124   a  is not provided with a reinforcing layer therein in order to be bent well and coupled to the radiographing body  130 . 
         [0076]    In the gooseneck arms, the first reinforcing layer  124   c ′ in the first gooseneck arm  124   c  is made of metal or synthetic resin with a first thickness t 1  (t 1 &gt;0) and the second reinforcing layer  124   b ′ in the second gooseneck arm  124   b  is made of metal or synthetic resin with a thickness t 2  (t 1 &gt;t 2  &gt;0). 
         [0077]    Accordingly, as shown in  FIG. 18 , the first gooseneck arm  124   c  that is thickest bends at a smallest angle (a), the second gooseneck arm  124   b  that is secondarily thick bends at a medium angle (b), and the third gooseneck arm  124   a  that is thin and bends well bends at a largest angle (c) (a&lt;b&lt;c). 
         [0078]      FIGS. 19 and 20  are views showing an X-ray radiography device according to a tenth embodiment of the present invention. In an X-ray radiography device  201  according to this embodiment, the variable connection member  124  is formed by combining a plurality of gooseneck arms  124   a,    124   b,  and  124   c  and a specific pipe-shaped extension arm  124   d  between the gooseneck arms  124   a,    124   b,  and  124   c.  The other configuration is substantially the same as the X-ray radiography device  109  according to the ninth embodiment. 
         [0079]    Accordingly, the X-ray radiography device  201  according to this embodiment can have a larger degree of freedom in control of the length, as compared with the X-ray radiography device  109  according to the ninth embodiment. 
         [0080]    Further, as in  FIG. 20 , it is possible to increase or decrease the length of the variable connection member by separating or combining the gooseneck arms  124   a,    124   b,  and  124   c  and the extension arms  124   d.    
         [0081]    The variable connection member  124  may be composed of a smaller number of gooseneck arms and extension arms with a smaller length at the portion that is coupled to the fixed body  110  that is supposed to be less bent. 
         [0082]    When the pipe-shaped extension arms  124   d  are made of PV, PE, PP, or PEEK that is an insulator, they are light and convenient to use, so the manufacturing cost can be reduced. 
         [0083]    Accordingly, the portion close to the fixed body  110  is less bent in a stable state, so the entire radiographing body  130  is prevented from falling down. Further, the gooseneck arms sequentially have different flexibilities, so flexibility is given to the variable arm. 
         [0084]      FIGS. 21 and 23  are views showing an X-ray radiography device according to an eleventh embodiment of the present invention. In an X-ray radiography device  202  according to this embodiment, the variable connection member  124  is formed by coupling a variable corrugated pipe  124   e  and a multi-stepped arm  124  to each other, and the variable corrugated pipe  124   e  and the radiographing body  130  are separably combined by a guide member  121   a.  The other configuration is substantially the same as the X-ray radiography device  101  according to the first embodiment. 
         [0085]    That is, the X-ray radiography device  202  according to this embodiment can be controlled in length by the multi-stepped arm  124   f  and in angle by the variable corrugated pipe  124   e.    
         [0086]    Further, the X-ray radiography device  202  according to this embodiment has the advantage that the radiographing body  110  and the variable arm  124  can be easily coupled and separated by the guide member  121   a.    
         [0087]    Further, the guide member  121   a  prevents the coupled portion between the radiographing body  130  and the variable arm  124  from being bent or damaged, when being fastened, even if a user holds and moves the radiographing body  130 , because the guide member  1231   a  covers the coupled portion. 
         [0088]      FIGS. 24 to 26  are views showing an X-ray radiography device according to a twelfth embodiment of the present invention. In an X-ray radiography device  203  according to this embodiment, a variable connection member  124  is a variable corrugated pipe  124   g  and the variable corrugated pipe  124   g  has a guide space  124   g ′ formed by longitudinally opening or cutting a portion thereof. 
         [0089]    The other configuration is the same as that of the X-ray radiography device  101  according to the first embodiment. 
         [0090]    The guide space  124   g ′ allows the variable corrugated pipe  124   g  to separate out from a cable  115  connecting the radiographing body  130  and the fixed body  110 . 
         [0091]    Further, a cable reel that can wind the cable  115  inside may be disposed in the fixed body  110 . 
         [0092]    That is, in order to use the X-ray radiography device  203  according to this embodiment, a user can take the cable  115  out of the fixed body  110  and fit the variable corrugated pipe  124   g  onto the cable  115 . Further, after using, the user can separate the variable corrugated pipe  124   g  from the cable  115  and stow the cable  115  in the fixed body  110 . 
         [0093]    Accordingly, the X-ray radiography device  203  according to this embodiment has the advantage of being easily moved and kept. 
         [0094]      FIGS. 27 to 31  are views showing an X-ray radiography device according to a thirteenth embodiment of the present invention. In an X-ray radiography device  204  according to this embodiment, a variable connection member  124  is a variable corrugated pipe  124   h  and a guide space  124   g ′ is longitudinally formed in the variable corrugated pipe  124   h,  which is substantially the same as the twelfth embodiment. 
         [0095]    However, the connectors  124   h ′ for coupling the radiographing body  130  to the fixed body  110  are further disposed at both ends of the variable corrugated pipe  124   h.    
         [0096]    Further, the connectors  124   h ′ may be threaded connectors  124   h ′ to be thread-fastened, as shown in  FIG. 30 , or may be protruding connectors  124   h ″ to be fitted, as shown in  FIG. 31 . 
         [0097]    However, the connectors  124   h ′ may be connectors that are coupled in various well-known types. 
         [0098]    The protruding connectors  124   h ″ may be connectors that can be elastically fitted. That is, after the variable corrugated pipe  124  is fitted on a cable  13  through the guide space  124   g ′, the connector at a side of the variable corrugated pipe  124   h  is fitted into fastening hole of the fixed body  110  and the connector at the other side of the variable corrugated pipe  124   h  is fitted into a fastening hole of the radiographing body  130 , thereby fitting is completed. 
         [0099]    That is, the X-ray radiography device  204  according to this embodiment has the advantage that the variable corrugated pipe  124   h  can be stably coupled to the fixed body  110  and the radiographing body  130  in use, even if a user strongly handles the variable corrugated pipe  124   h.    
         [0100]    On the other hand, though not described above,  FIGS. 32 to 37  show the radiographing body of the X-ray radiography device according to the embodiment of  FIG. 9 , and modified examples and using examples of the radiographing body. 
         [0101]    In detail,  FIG. 32  shows a radiographing body of the X-ray radiography device according to the embodiment of  FIG. 9  and  FIG. 33  shows the radiographing body of  FIG. 32  with first and second bodies moved. Further,  FIG. 34  shows a case when an X-ray generator is mounted on the first body of the radiographing body shown in  FIG. 32  and  FIG. 35  shows radiography using the radiographing body shown in  FIG. 34 . Further,  FIG. 36  shows a case when an X-ray generator is mounted on the second body of the radiographing body shown in  FIG. 32  and  FIG. 37  shows a handy type X-ray radiography device having a curved X-ray sensing unit of the radiographing body of  FIG. 32 . 
         [0102]    For convenience, only the radiographing body  140  is described hereafter and the above description can be generally applied for the other components. 
         [0103]    First, referring to  FIG. 32 , the radiographing body  140  includes a first body  143  that is inserted into a subject&#39;s mouth during radiography, a second body  141  that is positioned outside a subject&#39;s mouth during radiography, and a connection frame  145  that connects the bodies into a signal body. 
         [0104]    The connection frame  145  has a front end that is inserted into the mouth of a subject together with the first body  143  and a rear end that is larger in length than width to be positioned outside a mouth of a subject. The connection frame  145  is formed in a flat shape having a width larger than the thickness at the middle portion, which is a biting section that is bit by upper and lower teeth of a subject. 
         [0105]    The height from the bottom of the connection frame  145  to the top of the first body  143  or the second body  141  may be larger than the height from the bottom of the connection frame  145  to the top of the middle portion. 
         [0106]    In the biting section  146 , the width corresponding to the width direction of a set of teeth of a subject of is larger than the thickness, so the connection frame  145  can be kept in a stable position when the biting section is bit between teeth. 
         [0107]    The first body  143  at the front end of the connection frame  145  and the second body  141  at the rear end of the connection frame  145  can move relative to the connection frame  145  while being aligned with each other in the longitudinal direction of the connection frame  145 . 
         [0108]    As shown in  FIG. 33 , the first body  143  and the second body  141  can simultaneously slide with respect to the connection frame  145 . This configuration allows for easy radiography of not only the front teeth, but the back teeth of a subject, using the radiographing body  140 . That is, when the second body  141  positioned outside the mouth of a subject is moved toward back teeth with the biting section  146  bit under the front teeth of the subject, the first body  143  inside the mouth is also moved and aligned with the second body  141 , whereby accurate radiography can be performed. 
         [0109]    This configuration may be achieved in various mechanical types. For example, the first body  143  and the second body  141  may be disposed to slide on rails, respectively, arranged in the width direction of the connection frame  145 , and the first body  143  and the second body  141  may be slid the same distance in the same direction by a predetermined unit in the connection frame  145 . 
         [0110]    The connection frame  145  may be made of a flexible material to be transformed by pressure applied by a user, or the connection frame  145  may have a joint so that the angle between the first body  143  and the second body  141  can be controlled. The angle made between the first body  143  and the second body  141  may be less than 180 degrees. According to this configuration, it is possible to perform radiography by controlling the angle between the first body  143  and the second body  141  when it is difficult to radiograph a desired tooth with the first body  143  and the second body  141  of the radiographing body  140  aligned in a straight line. When the connection frame  145  is bent left or right from the longitudinal direction by bending the joint, the first body  143  and the second body  141  can be rotated with respect to the connection frame  145  so that the X-ray generator and the X-ray sensing unit are aligned to face each other. 
         [0111]    The X-ray generator is disposed at any one of the first body  143  and the second body  141  and the X-ray sensing unit is disposed at the other one. For example, an X-ray generator G may be disposed at the first body  143  and an X-ray sensing unit S may be disposed at the second body  141 , as shown in  FIG. 32 . The position of the biting section  112  may be determined in consideration of the size of the first body  143  that is inserted into a mouth or the second body  141 . A collimator  142  that controls an X-ray radiation area may be disposed on the side through which an X-ray is radiated of the X-ray generator G. The X-ray sensing unit S includes an X-ray sensor and is supported by a sensor support unit  144 , and the X-ray sensing unit S may be selectively equipped with X-ray sensors having various sizes, depending on the size of the area to be radiographed. Further, a control circuit for controlling the X-ray generator G and a radiograph-processing circuit for processing electrical signals received from the X-ray sensing unit S may be disposed inside the connection frame  145  or the sensor support unit  144  that functions as a case for the first body  143  or the second body  141 . 
         [0112]      FIG. 34  shows a case when an X-ray generator is disposed at the first body. In  FIG. 34 , (a) shows a side of the radiographing body  140  and (b) shows the collimator  143 . The collimator  142  is disposed on the path through which an X-ray radiated from the X-ray generator at the first body  143  travels and controls the size of an area  0  that transmits the X-ray, thereby controlling an X-ray radiation area on a tooth. A controller for the collimator  142  may be disposed at the connection frame  145 , the first body  143 , or the second body  141  in order to control the collimator  142  from the outside even if the collimator  142  is inserted in a mouth. 
         [0113]    The second body  141  may further include a battery B. The battery B may be a battery pack and detachably mounted on the second body  141 , or may be formed in a built-in type to be chargeable. 
         [0114]      FIG. 35  is a view schematically showing radiography using the radiographing body. (a) shows radiography with the first body  143 , which is equipped with the X-ray generator G, inserted in a mouth. The biting section  146  of the connection frame  145  is bit and supported between the upper and lower teeth of a subject. 
         [0115]    The second body  141  that is positioned outside a mouth may further include a laser display  147  that radiates an X-ray to the mouth and displays an X-ray radiation area on the surfaces of the lips of a subject. The laser display  147  may display a laser pattern L, which shows the area where an X-ray is substantially radiated, in cooperation with the collimator  142 . 
         [0116]      FIG. 36  shows a case when an X-ray generator is disposed at the second body. As shown in this figure, the X-ray generator  121  may be disposed at the second body  141 , in which the collimator  142  is disposed on a side, which faces the first body  143 , of the second body  141 . Further, an X-ray sensing unit S that receives an X-ray passing through a subject is disposed on the first body  143 , and the X-ray sensing unit S may include an X-ray sensor and may be supported by a sensor support unit  144  that constitutes the first body  143  with the X-ray sensor S. The second body  141  that is positioned outside a mouth may further include a laser display  147  that radiates an X-ray into the mouth and displays an X-ray radiation area on the surfaces of the lips L of a subject. The laser display  147  may display a laser pattern L, which shows the area where an X-ray is substantially radiated, in cooperation with the collimator  142 . 
         [0117]      FIG. 37  shows a curved X-ray sensing unit. As shown in the figure, the first body  143  includes a curved X-ray sensing unit S. The curved X-ray sensing unit S may be curved to fit to the outline of the inner side of a tooth. The sensor support unit  144  is formed to fit to the shape of the curved X-ray sensing unit S and supports the curved X-ray sensing unit S. As a modified example, the curved X-ray sensing unit S may be bent to fit to the outline of the inner side of a tooth by pressure. In this case, the sensor support unit  144  may be made of a material that is elastically transformed with transformation of the curved X-ray sensing unit S. 
         [0118]    Although embodiments of the present invention were described above, they are provided only for those skilled in the art to easily achieve the present invention and the present invention should not be construed as being limited to the embodiments. 
       INDUSTRIAL APPLICABILITY 
       [0119]    The prevent invention can be used for medical X-ray radiography devices, particularly, dental X-ray radiography devices.