Abstract:
The present invention discloses a device for detecting x-rays inside the mouth, which can be conveniently moved inside the mouth, can increase user convenience, and has improved economic feasibility. The device for detecting x-rays inside the mouth according to the present invention comprises: a sensor unit having a sensor built therein for detecting x-rays; a hinge unit formed on one surface of the sensor unit; and a cable connecting unit including a pivoting connecting portion having an external cable coupled thereto and coupled to be pivotable to the hinge unit. An internal cable withdrawn from the sensor unit is electrically connected to the external cable through the inside of the cable connecting unit by means of the hinge unit and the pivoting connecting portion.

Description:
TECHNICAL FIELD 
       [0001]    This invention relates to an intraoral X-ray detectors and to an intraoral X-ray detector which is freely movable and easily repairable because a cable connecting unit, to which an external cable is attached, is hinge-coupled to be rotatable, to be attachable and detachable to the sensor part. 
       BACKGROUND ART 
       [0002]    In dentistry, generally, intraoral dental information is required to determine the conditions for the treatment of teeth, X-ray imaging device using the X-rays to obtain an intraoral dental information is provided. 
         [0003]    The X-ray imaging device is comprised of an X-ray irradiator and the X-ray detector for detecting the irradiated X-rays, usually the X-ray irradiated from an outside of a mouth are detected by the X-ray detector inside the mouth. 
         [0004]    As shown in  FIG. 1 , the conventional intraoral X-ray detector has a structure that a cable connecting unit  20  to which the external cable  30  is attached and a sensor unit  10  for detecting X-rays are formed integrally. 
         [0005]    This conventional intraoral X-ray detector is not free to move the cable in the mouth, so there were drawbacks that an user should fold the cable to detect a particular tooth, or dispose the entire product even when the external cable connector are only damaged because the cable connecting unit and the sensor unit are formed in one body. 
         [0006]    Furthermore, it should be done in the shortest path to retract the cable  30  from the mouth so that it can reduce the feeling of irritation of a patient. But as the conventional cable is fixed type, it can be different a folding degree of the cable or a retracting path of the cable as a position of teeth or a direction of biting. With these matters, the patient can be uncomfortable while obtaining images. 
       DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem 
       [0007]    To solve the prior technical problem, this invention provides an intraoral X-ray detector which a sensor unit can be freely movable by a hinged connection between the sensor unit and a cable connecting unit which is connected to an external cable, and an external cable or a cable connecting unit can be easily replaceable when defects or damages are found in the external cable or the cable connecting unit. 
       Technical Solution 
       [0008]    To achieve the object, the invention provides intraoral X-ray detector, including: a sensor unit having a built-in sensor for sensing X-rays; a hinge unit formed on one side of the sensor unit; a cable connecting unit being connected with an external cable and including a rotary coupling part rotatably coupling the cable connecting unit to the hinge unit, wherein an internal cable drawn from the sensor unit is electrically coupled to the external cable through the hinge unit, the rotary coupling part and inside of the cable connecting unit. 
         [0009]    The cable connecting unit is coupled to the hinge in a detachable manner through the rotary coupling part, and the cable connecting unit further includes a cable connecting terminal configured to be connected to the external cable and separated from the external cable, electrically and physically. 
         [0010]    The hinge unit may include a pair of hinges protruded facing each other in direction of a minor axis or the major axis direction on one side of the sensor unit, and a pair of hinge shafts protruded in a direction of facing each other from the pair of hinges, and the rotary coupling part includes a pair of connecting parts at both sides thereof, into which the pair of hinge shafts are respectively inserted. 
         [0011]    The hinge unit may include a sunken shaped in a direction of a major axis or a minor axis on one side of the sensing unit and a pair of hinge shafts formed at both sides of the hinge unit, and the rotary coupling part includes a pair of connecting parts, at both sides thereof, into which the pair of the hinge shafts are respectively inserted. 
         [0012]    The hinge unit may include a hinge formed in a sunken shape at one side of the sensor unit in the minor axis or the minor axis direction, and a pair of hinge shafts form at both sides of the hinge unit, and the rotary coupling part includes a pair of connecting parts, where the hinge shafts are respectively inserted, at both ends of the cable connecting unit. 
         [0013]    The hinge unit is formed to be sloped in a major axis direction of the sensor unit, and the rotary coupling part rotatably couples the cable connecting unit to the hinge unit. 
         [0014]    The hinge is formed on a corner at one side of the sensor unit. On the other hand, the hinge unit includes a pair of hinges facing each other and formed to be protruded from the sensor unit and a pair of hinge shafts formed on the hinges, and the rotary coupling unit includes a pair of connecting parts where the hinge shafts are inserted at both ends of the cable connecting unit. 
         [0015]    Otherwise, the hinge unit may be connecting terminals which is connected to the sensor and is protruded from the both side of the sensor unit. The rotary coupling part has two ends which are rotatably assembled to the connecting terminal. And a terminal connecting electrode can be contained in the cable connecting unit. The terminal connecting electrode electrically connects the connecting terminal and the external cable. 
         [0016]    Then, a first connecting hole and a second connecting hole are formed at both sides of the rotary coupling part to be connected to the connecting terminal. The connecting terminal is inserted through the first connecting hole and the second connecting hole and rotatably and electrically connected to the terminal connecting electrode. 
         [0017]    Desirably, a stopper formed on one side of the cable connecting unit and configured to limit the rotating angle of the sensing unit. 
       Advantageous Effects 
       [0018]    According to the present invention, the cable connecting unit being connected to the external cable can be rotatably attached to the sensor unit by the hinge unit for the sensor unit to be easily moved in a mouth and then the user convenience can be increased. 
         [0019]    In addition, the cable connecting unit is detachably mounted on the hinge unit. The cable connecting unit further includes a cable connecting terminal which is electrically and physically connected to or separated with an external cable. Thus each component of the intraoral X-ray detector can be respectively replaced when there is a failure, and it is possible to have an effect of improving the economical efficiency and increasing of lifetime. 
         [0020]    In addition, even if the rotary coupling part rotates, the electrical connection can be ensured. So it is possible to improve the reliability of performance. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a prospective view schematically showing a conventional X-ray detector. 
           [0022]      FIG. 2  is a perspective view showing the intraoral X-ray detector according to the first embodiment of the present invention. 
           [0023]      FIG. 3  shows a perspective view of the disassembled intraoral X-ray detector in  FIG. 2 . 
           [0024]      FIGS. 4 to 9  are views showing components of intraoral X-ray detector according to various modifications of the first embodiment of the present invention. 
           [0025]      FIG. 10  is a perspective view showing the disassembled intraoral X-ray detector according to the second embodiment of the present invention. 
           [0026]      FIG. 11  shows a perspective view of the assembled intraoral X-ray detector in  FIG. 2 . 
           [0027]      FIG. 12  is a sectional view showing a connecting structure of the connecting terminal and the terminal connecting electrode of the X-ray detector in  FIG. 10 . 
       
    
    
     NUMERALS STANDS FOR 
       [0000]    
       
         
           
               100 : Sensor unit  310 : First frame 
               110 : Sensor  320 : Second frame 
               200 : Hinge  330 : First connecting part 
               210 : First hinge  340 : Second connecting part 
               220 : Second hinge  350 : Cable connecting terminal 
               230 : First hinge shaft  400 ,  1230 : External cable 
               240 : Second hinge shaft  500 : Internal cable 
               300 ,  1200 : Cable connecting unit  1120 : Connecting terminal 
               1210 : Upper housing  1220 : Lower housing 
               1222 : Connecting groove  1224 : Second connecting hole 
               1226 : Second connecting hole  1232 : Cable accessing part 
               1240 : Terminal connecting electrode  1242 : First connecting hole 
               1122   a ,  1122   b ,  1122   c : Terminal electrode 
               1242   a ,  1242   b ,  1242   c : Exposed electrode part 
               1246   a ,  1246   b ,  1246   c : Electrode 
           
         
       
     
       BEST MODE FOR CARRYING OUT THE INVENTION 
       [0043]    Hereinafter be described with reference to the accompanying drawings, preferred embodiments of the present invention. Embodiment of the present invention may be modified in various other forms of, but is not limited to the scope of the invention embodiment to be described below. Shape, size, etc. of the elements in the FIG.s may be exaggerated for more clear explanation, the elements represented by the same reference numerals on the drawings are the same element. 
         [0044]    And in full herein, also it includes a case when some portion to said another portion and a “connection” which is not only the case, “directly connected to” another element in between “electrical connection” is that. In addition, when a part that is to some components “include” or “comprising”, which means that not to exclude other components do not have a special substrate that is opposite to the other components may include or have the more. 
         [0045]    In this embodiment, the “major axis” direction of the sensor unit denotes the direction toward the longer side of the sensor unit, and the “minor axis” direction of the sensor unit denotes the direction toward the shorter side of the sensor unit. 
         [0046]      FIGS. 2 and 3  are a perspective view and a disassembled perspective view of the first embodiment configuration of the present invention. 
         [0047]    Referring to  FIG. 2 , the intraoral X-ray detector, according to an embodiment of the present invention, includes a sensor unit  100 , a hinge unit  200 , and a cable connecting unit  300 . 
         [0048]    In the sensor unit  100 , a sensor  110  for detecting X-rays irradiated from an X-ray irradiation apparatus (not illustrated) is included, and a receiving surface of the sensor  110  faces toward a lower surface of the sensor unit  100 . The sensor  110  may be a digital X-ray sensor and function of converting radiation signals into electric signals or image signals. 
         [0049]    The digital X-ray sensor may be an indirect conversion type which converts radiation into visible light and converts again the visible light into electric signals, or a direct conversion type which converts the radiation directly into the electric signals. 
         [0050]    The indirect conversion type may include a scintillator for converting radiation into visible light and a digital image sensor for detecting the visible light 
         [0051]    The direct conversion type has an assembled form of a photoconductive conversion unit for converting the radiation into the electric signals with use of semiconductor material and a signal processing unit for converting the electric signals into the image signals. And this enables to get high performance and high resolution because the radiations are converted directly into the electric signals. 
         [0052]    The hinge unit  200  may be formed with two hinges, i.e., a first hinge  210  and a second hinge  220 , and the first hinge  210  and the second hinge  220  are positioned to face each other. It is enough to locate the first hinge  210  and the second hinge  220  so as to face each other, at any side of the sensor unit  100  except the lower surface. Namely, the position of the hinge unit  200  is not limited to the upper surface different from the drawing. 
         [0053]    A fixing pin (not illustrated) for fixing the rotation position of the cable connecting unit  300  may be included at the first hinge  210  or the second hinge  220 . It is possible to enhance the convenience in use at various regions within the mouth by fixing the cable connecting unit  300  before the rotation or after the rotation in direction of arrow by use of the fixing pin. 
         [0054]    That is, the rotation is possible by the hinge unit, it is possible to minimize the volume occupied by the cable because the structure enables the cable connecting unit  300  stick to the surface of the sensor unit  100 . Thus, the patient can minimize the feeling of irritation. 
         [0055]    The cable connecting unit  300  is rotatably connected to the first hinge  210  and the second hinge  220  and is able to move in the direction of the arrow. Further, an internal cable  500  drawn from the sensor  110  is connected, through the first hinge  210  and/or the second hinge  220  and through the inside of the cable connecting unit  300 , to a cable connecting terminal  350  provided at one side of the cable connecting unit  300 . In consequence, it is possible to transmit the electrical signals detected by the sensor  110  to an external cable  400 . 
         [0056]    Referring to  FIG. 3 , elements of intraoral X-ray detector in accordance with an embodiment of the present invention will be described in detail. 
         [0057]    The first hinge  210  and the second hinge  220 , for an example, may be formed by protrusion on the upper surface of the sensor unit  100  to have a cross-sectional surface of an oval shape in a vertical direction. The shape of the hinge is not limited to the oval shape but it may be modified in various shapes including a square, a rectangular and so on. 
         [0058]    A first hinge shaft  230  is formed in a protrusion manner to have a circular cross-sectional shape in a vertical direction at one side of the first hinge  210 . A second hinge shaft  240  is formed to have a corresponding shape to the first hinge shaft  230  at one side of the second hinge  220  which facing the one side of the first hinge  210 . Only, the shape of the hinge shafts is not limited to the circular cross-sectional shape, but it can be variously modified as like hexagonal or octagonal shape. 
         [0059]    According to one embodiment of the invention, a first hinge shaft  230  and a second hinge shaft  240  are separated each other for easy attachment and detachment with the cable connecting unit  300  to be described later. However, they are not limited to this, but the first hinge shaft  230  and the second hinge shaft  240  may be linked to have one hinge shaft. 
         [0060]    The cable connecting unit  300  may be formed with a first frame  310  and a second frame  320  separable so as to be combined in attachable and detachable form to the hinge unit  200 . In specific, a first connecting part  330  and a second connecting part  340  are formed to face each other at one portion of a side surface of the cable connecting unit  300  where the first frame  310  and the second frame  320  are coupled, the first connecting part  330  is coupled to the first hinge shaft  230  and the second connecting part  340  is coupled to the second hinge shaft  240  so that the cable connecting unit  300  is combined in a attachable and detachable with the hinge unit  200 . 
         [0061]    The first connecting part  330  and the second connecting part  340  are combined to wrap first hinge shaft  230  and the second hinge shaft  240  respectively. For this, the first connecting part  330  and the second connecting part  330  may be respectively formed in a shape of a circle corresponding to a cross-sectional surface in a vertical direction of the first hinge shaft  230  and the second hinge shaft  240 . Additionally, not limited to this, it can be changed according the cross-sectional shape of the first hinge shaft  230  and the second hinge shaft  240  in a vertical direction. 
         [0062]    In the embodiment of the present invention, the first hinge shaft  230  and the second hinge shaft  240  are respectively formed in the first hinge  210  and the second hinge, and the first connecting part  330  and the second connecting part  340  are respectively formed in the cable connecting unit  300  to have a hinge coupling each other. However, on the contrary, it is also possible that the first hinge shaft  230  and the second hinge shaft  240  are respectively formed in the cable connecting unit  300 , and the first connecting part  330  and the second connecting part  340  are respectively formed on the first hinge  210  and the second hinge  220  have a hinge coupling each other. Besides, the sensor unit  100  and the cable connecting unit  300  may have the hinge coupling by changing the position of the hinge shaft and the hinge pin in variety. 
         [0063]    A cable connecting terminal  350  to be physically and electrically connected to or separated from the external cable  400  is formed at the rear side of the cable connecting unit  300 , and the electric connection is possible by inserting a connecting terminal of the external cable into the cable connecting terminal  350 . The internal cable  500  drawn from the sensor  110  of the sensor unit  100  is coupled to the cable connecting terminal  350  in side of the cable connecting unit  300  through the first hinge  210  and/or the second hinge  220  of the sensor unit  100  and the first connecting unit  330  and/or the second connecting unit  340  of the cable connecting unit  300 . Thus, the external cable  400  is electrically coupled to the sensor  110  of the sensor when the connecting terminal of the external cable  400  is inserted into the cable connecting terminal  350 . By doing this, the electric signals detected by the sensor  100  can be delivered to the external table  400 . 
         [0064]    In the embodiment of the present invention, the external cable  400  and the cable connecting terminal  350  are respectively formed of a micro USB cable and a micro USB connecting terminal, but not limited there to, and various modifications including USB cable may be adopted. 
         [0065]    In the embodiment of the present invention, the cable connecting unit and the external cable can be detachably combined through the cable connecting terminal, but not limited there to, and the cable connecting unit and the external cable can be modified in an integral form in consideration of usage environment. 
         [0066]    Desirably, the internal cable  500  and the external cable  400  are connected by a jumper cable (not illustrated) inside the cable connecting unit  300 , or it is possible to make the external and internal cables are electrically coupled when hinge coupling of the first hinge shaft  230  and/or the second hinge shaft  240  and the first connecting unit  330  and/or the second connecting unit  340  by forming a first contacting terminal (not illustrated) to which the internal cable  500  is connected is formed at the first hinge  230  and/or the second hinge  240 . 
         [0067]    In particular, in case of the latter, the electrical connection can be maintained in stable despite of the rotation of the cable connecting unit  300  about the sensor unit  100  if slip rings and brushes are used as the first contacting terminal (not illustrated) and the second contacting terminal (not illustrated) 
         [0068]    The sensor unit  100  may be formed in a rectangular shape so as to take images in a direction of the normal teeth array and installed horizontally on the sensor unit. In the above embodiment, the first and second hinges  210  and  220  and the first and second hinge shafts  230  and  240  are disposed in a minor axis direction of the sensor unit. However, this hinge structure can be varied depending on the use or orientation of the sensor. 
         [0069]      FIGS. 4 to 9  are related to several embodiments of modification of the structure of the hinge combination between the cable connecting units  302  to  307  and the sensor units  102  to  107 . 
         [0070]      FIG. 4  is a disassembled perspective view showing another modified embodiment of the invention in  FIG. 3   
         [0071]    In this embodiment, since the cable connecting unit  302  has the same configuration as the embodiment in  FIG. 3 , detailed description thereof will be omitted. In the sensor unit  102 , a first hinge  212  and a second hinge  222  facing each other in the major axis direction are formed in the sensor unit  102 , the first hinge shaft  232  is formed in the first hinge  212 , and the second hinge shaft  242  is formed in the second hinge  222 . In this case, it is useful to minimize the feeling of irritation due to the cable when imaging is performed in the longitudinal direction to cover the root of the particular tooth by use of the sensor unit  210 . 
         [0072]      FIG. 5  is a disassembled perspective view showing another modified embodiment of the invention in  FIG. 3 . 
         [0073]    In this embodiment in  FIG. 5 , the sensor unit  103  includes a hinge unit  213  which is formed protruding in the minor axis direction and a hinge shaft  223  formed at both side surfaces of the hinge unit, a cable connecting unit  303  is divided into two branches to have a rotary coupling part, which includes a first connecting part  313  to which the first hinge shaft  213  is inserted and the second connecting part  323  to which the second hinge shaft  213  is inserted are provided at inner side of the two divided ends. Accordingly, the cable connecting unit  303  is pivotally coupled and connected at both ends of the hinge unit  213 . 
         [0074]      FIG. 6  is an exploded perspective view showing the X-ray detector according to a fourth embodiment of the present invention. 
         [0075]    In this embodiment, the sensor unit  104  includes a hinge  214  protrude in the major axis direction and a hinge shaft  224  formed at both side surfaces of the hinge. Like as the third embodiment, the cable connecting unit  304  includes a first connection unit  314  and a second connecting unit  324 . Accordingly, the cable connecting unit  304  is pivotally coupled and connected at both ends of the hinge  214 . 
         [0076]      FIG. 7  is an exploded perspective view showing another modified embodiment of the invention in  FIG. 3 . 
         [0077]    In this embodiment in  FIG. 7 , the sensor unit  105  includes a hinge unit  215  having a sunken shape in the minor axis direction and a pair of hinge shafts  225  protruded toward inside at both side surfaces of the hinge. Like as the first and the second embodiments, the cable connecting unit  305  includes a pair of connecting units  315  to which a pair of hinges  225  are inserted at both ends thereof. Accordingly, the cable connecting unit  305  is pivotally coupled and connected at the hinge  215  inside of the sensor  105 . 
         [0078]      FIG. 8  is an exploded perspective view showing another modified embodiment of the invention in  FIG. 3 . 
         [0079]    This embodiment has modified a rotational direction of the embodiment, in  FIG. 7 , the sensor unit  106  includes a hinge unit  216  formed as a sunken shape in the major axis direction and a pair of hinge shafts  226  formed inwardly at both side surfaces of the hinge unit  216 . Like as the fifth embodiment, the cable connecting unit  306  includes a pair of connecting units  326 . Accordingly, the cable connecting unit  306  is pivotally coupled at the hinge  216  inside of the sensor  106 . 
         [0080]      FIG. 9  is a view showing another modified embodiment of the invention in  FIG. 3 . 
         [0081]    The sensor unit  107  includes a pair of hinge units  217  facing each other in a direction sloped by a predetermined angel about the major and the minor axes direction and protruded from the sensor unit  107  and a pair of hinge shafts formed on the hinge, and a cable connecting unit  307  includes a pair of connecting units  317  at both ends there of the hinge shafts  227  are inserted. In this case, it has advantage of minimizing the size of the cable connecting unit  307  because it is possible to form the hinges  217  at the corners of the sensor unit  107 . 
         [0082]    By the modification the embodiment in  FIG. 9 , it is possible to combine the cable connecting unit at both sides of the hinge or to form hinge units in a sunken shape. 
         [0083]    In the embodiments in  FIG. 3  to  FIG. 9 , the sunken shape or the protrusion of the hinges is applicable with a modification, and all the structures with which the hinge shaft and the connecting unit are to be pivotally coupled each other are within the present invention. For an instance, although it has not been described in the embodiments above, a rotational axis is formed on the cable connecting unit, and a connecting part of concave type may be formed on the hinge. In other words, the hinge and the connecting part may be substitute with hinges coupling each other and rotational connecting part corresponding thereto. 
         [0084]      FIGS. 10 and 11  are a perspective view and an exploded perspective view of a second embodiment configuration of the present invention. 
         [0085]    As shown in  FIG. 10 , the intraoral X-ray detector according to an embodiment of the present invention, includes a sensor unit  1100 , a cable connecting unit  1200 , and an external cable  1230 . 
         [0086]    The sensor  1110  is equipped with in the sensor unit  1100 , and a pair of connecting terminals  1120  in the sensor unit which is electrically connected with the sensor are exposed at both sides of the sensor unit. For reference, in  FIG. 10 , a part of the sensor unit is illustrated in cutting view in order to show the sensor and sensor unit connecting terminal  120  therein. The rotary coupling part  200  is branched in “U” shape so that both end parts are pivotally and electrically connected to the connecting terminal  120 . 
         [0087]    A cable connecting unit  1200  includes an upper housing  1210  and a lower housing  1220 , and further includes a connecting groove  1222  formed with one of these or combination thereof. In the connecting groove, a terminal connecting electrode  1240  which is made of the conductive material for delivering the power source and/or the signal is inserted. The electrode is formed in the u-shaped and is connected to the connecting terminal  1120  in both ends of a rotary coupling part of the sensor unit  100 , and is connected to the external cable  1230 . In the present preferred embodiment, it is classified with the two for the convenience of assembly, the terminal connecting electrode  1240  is formed in a divided two parts for an easy assemble, and each segment is connected to the one of the terminal connecting electrode, and they are respectively connected to the external cable  1230 . The external cable  1230  is inserted and coupled together when the upper and lower housings  1210  and  1220  are assembled. And the cable accessing part  1232  which is an end part of the external cable  1230  is connected to the joint part  1244  of the terminal connecting electrode  1240 . At this time, if necessary, the cable connecting unit  1230  may be connected to the terminal connecting electrode  1240  through the joint part  1244  by inserting the cable accessing part  1232  of the external cable  1230  at a side of an assembled body of the lower and the upper housings  1210  and  1220 . 
         [0088]    At the end of the electrode  1240 , a first connecting hole  1242  is formed, and a second connecting hole  1226  is also formed in the corresponding position in the end of the lower housing  1220 . The connecting terminal  1120  as a hinge shaft is rotatably and electrically connected to the terminal connecting electrode  1240  through the second connecting hole  1226  by being inserted into the first connecting hole  1242 . Therefore, the sensor  1110  within the mouth is electrically connected to the cable connecting unit  1230  connected to the outside. 
         [0089]    In order that the sensor unit  100  sets up the initial position of the sensor, it is desirable not to rotate over 180° C. A protruded stopper  1228  is formed at one side of the cable connecting unit  1200 , and the seating groove  1102  contacting with the stopper when the sensor unit  100  rotated with 180° C. is formed in the sensor unit  1100 . 
         [0090]    As shown in  FIG. 11 , if the sensor unit  1100 , the cable connecting unit  1200  and external cable  1230  are assembled, the sensor unit  1100  can be rotated according to the arrow, and it is limited by the stopper  228  in which the rotation range describes in the above with ±180° C. In this preferred embodiment, a third connecting hole  1224  is formed when the upper and lower housings  1210  and  1220  of the cable connecting unit  1200  are assemble, and it is sealed up with the insulator  1250 . Through this, it can be easily assembled, and the liquid within the mouth is electrically separated from the internal terminal  1120  and the terminal connecting electrode  1240 . 
         [0091]    In this preferred embodiment, a electrical power is supplied through the cable connecting unit  1230 , terminal connecting electrode  1240 , and connecting terminal  1120  since the connecting terminal  1120  and the first connecting hole  1242  of the terminal connecting electrode  1240  rotate relatively, and it is possible to configure so that the sensing signal of the sensor unit  1100  can be transmitted and received wirelessly through the communication unit which is not illustrated and mounted within the sensor unit  1100 . On the other hand, the electrical power is supplied through the external cable  1230  and the terminal connecting electrode  1240 , and it is possible to deliver the electric signals generated by the intraoral X-ray imaging in the sensor  1110  of the sensor unit  1100  to the outside through the connecting terminal  1120 , the terminal connecting electrode and the external cable  1230 . 
         [0092]      FIG. 12  shows the section structure of the modified connecting terminal  1120  and the first connecting hole  1242  of the terminal connecting electrode  1240  in the oral X-ray detector according to the present invention. As described in  FIG. 12 , the connecting terminal  1120  has three electrodes  1122   a ,  1122   b ,  1122   c  composed of the concentric circle, and each electrode is formed to be stepped and is exposed to the outside and insulated each other. In the meantime, the first connecting hole  1242  of the terminal connecting electrode is formed to be stepped and has three internally exposed electrodes  1246   a ,  1246   b ,  1246   c  which are electrically insulated in each other. It is desirable that the remaining part of the electrode for the terminal connection is made of the insulating material since the three electrodes should be electrically isolated. Instead of wholly forming the terminal connection electrode  1240  with conductive material, it may have the form of PCB having multiple conductive lines on an insulator. If the connecting terminal  1120  is inserted into the first connecting hole  1242 , only the electrodes of corresponding electrodes are contact to each other, in that way, electrodes of the respective connecting terminal  1120  are independently connected to the corresponding electrodes of the electrode  240  for the terminal connection. 
         [0093]    Exposed parts  1242   a ,  1242   b ,  1242   c  inside of the first connecting hole  1242  of each of the terminal connecting electrode  1240  are made of the ring or the brush form, and the contact with the electrodes of the connecting terminal  1120  are authentically maintained although the connecting terminal  1120  rotates. Moreover, the exposed part is conductive and has bearing form so that it can facilitate the rotation easily. 
         [0094]    Or on the other hand, the connecting terminal  1120  and the first connecting hole  1242  of the terminal connecting electrode  1240  can be electrically connected in a multiple slip ring structure including multiple slipping electrodes insulated each other instead of a correspondingly stepped form at connecting terminal  1120 , multiple brush electrodes faced and contacted in one-to-one to the multiple slipping electrodes at the first connecting hole  1242  of the terminal connecting electrode  1240 . 
         [0095]    In the above preferred embodiment, the three electrodes are used for power, signal transmission and signal reception. However, the number of electrode can be changed according to the driving method of the oral device for taking x-ray photographs, the imaging mechanism or software used. 
         [0096]    Consequently, according to the posture of the sensor unit  1100 , it rotates at the angle in which the patient minimally can do the feeling of irritation of cable during the oral X-ray imaging because the cable connecting unit  1200  can rotate and the inconvenience of the patient can be minimized. 
         [0097]    Moreover, the cable connecting unit  1200  rotates about the sensor unit  1100 . And yet the circuit line in which the electrical connection can be authentically maintained is formed. Therefore, the transmission and/or reception including the power source or the image signal etc. can be guaranteed. 
         [0098]    The invention described above is not limited to the above-described embodiments and drawings, It will be apparent to a person with a number of substituted, conventional knowledge in the art to which the invention pertains that variations and modifications are possible without departing from the scope of the technical concept of the present invention.