Patent Number: 
Section: claims

1. An X-ray source, comprising:a cathode including a shielding channel through which an X-ray passes;emitters formed on an upper surface of the cathode, and arranged around the shielding channel;an anode positioned so as to face the cathode, and including an anode target in which an E-beam is focused; anda gate electrode positioned between the cathode and the anode, and including gate holes at positions corresponding to those of the emitters. 2. The X-ray source of claim 1, wherein the shielding channel passes through the cathode in a thickness direction of the cathode, and has an inlet and an outlet which have the same width. 3. The X-ray source of claim 1, wherein the shielding channel passes through the cathode in a thickness direction of the cathode, and has an inlet and an outlet, in which the inlet has a larger width than that of the outlet. 4. The X-ray source of claim 1, wherein a radiation angle of the X-ray emitted from the anode target is determined by adjusting a diameter of an E-beam which is focused in the anode target. 5. The X-ray source of claim 1, wherein a radiation angle θ of the X-ray emitted from the anode target and a diameter D of the X-ray, which passes through the shielding channel and reaches a detector, satisfy an equation below,                    d        1            ≈      0        ,                  d        3            ≥              d        2                        D              m        ⁢                                  ⁢        i        ⁢                                  ⁢        n              =                  d        2            ⁡              (                  1          +                      L                          l              ⁢                                                          ⁢              1                                      )                        θ              m        ⁢                                  ⁢        i        ⁢                                  ⁢        n              =          2      ⁢                        tan                      -            1                          ⁡                  (                                                    D                                  m                  ⁢                                                                          ⁢                  i                  ⁢                                                                          ⁢                  n                                            -                              d                2                                                    2              ⁢              L                                )                    here, d1 represents a diameter of the E-beam which is focused in the anode target, d2 represents a diameter of an outlet of the shielding channel, l1 represents a distance from the anode target to the outlet of the shielding channel, and L represents a distance from the outlet of the shielding channel to the detector. 6. The X-ray source of claim 1, wherein the X-ray, which passes through the shielding channel and reaches a detector, satisfies an equation below,      d          1      ⁢      ma      ⁢                          ⁢      x        =                              l          1                          l          2                    ⁢              (                              d            2                    +                      d            3                          )              -          d      2      here, d1max represents a maximum diameter of an E-beam, which is focused in the anode target, l1 represents a distance from the anode target to an outlet of the shielding channel, l2 represents a distance of the shielding channel, d2 represents a diameter of the outlet of the shielding channel, and d3 represents a diameter of an inlet of the shielding channel. 7. The X-ray source of claim 6, wherein a radiation angle θ of the X-ray emitted from the anode target and a diameter D of the X-ray, which passes through the shielding channel and reaches a detector, satisfy an equation below,                    d        1            <              d                  1          ⁢          ma          ⁢                                          ⁢          x                      ,                  d        3            ≥              d        2                  D    =                                                      d              1                        +                          d              2                                            l            1                          ⁢        L            +              d        2                  θ    =          2      ⁢                        tan                      -            1                          ⁡                  (                                    D              -                              d                2                                                    2              ⁢              L                                )                    here, d1 represents a diameter of an E-beam which is focused in the anode target, d1max represents a maximum diameter of the E-beam, which is focused in the anode target, d2 represents the diameter of the outlet of the shielding channel, l1 represents the distance from the anode target to the outlet of the shielding channel, and L represents a distance from the outlet of the shielding channel to the detector. 8. The X-ray source of claim 6, wherein a radiation angle θ of the X-ray emitted from the anode target and a diameter D of the X-ray, which passes through the shielding channel and reaches a detector, satisfy an equation below,                    d        1            =              d                  1          ⁢          ma          ⁢                                          ⁢          x                      ,                  d        3            ≥              d        2                        D              ma        ⁢                                  ⁢        x              =                                                      d              2                        +                          d              3                                            l            2                          ⁢        L            +              d        2                        θ              ma        ⁢                                  ⁢        x              =          2      ⁢                        tan                      -            1                          ⁡                  (                                                    d                2                            -                              d                3                                                    2              ⁢                              l                2                                              )                    here, d1 represents a diameter of an E-beam which is focused in the anode target, d2 represents the diameter of the outlet of the shielding channel, d3 represents the diameter of the inlet of the shielding channel, l2 represents the distance of the shielding channel, and L represents a distance from the outlet of the shielding channel to the detector. 9. The X-ray source of claim 1, wherein the cathode includes:a first plate including a first shielding channel through which the X-ray passes; anda second shielding channel, through which the X-ray passing through the first shielding channel passes. 10. The X-ray source of claim 9, wherein the second shielding channel has a narrower width than that of the first shielding channel. 11. The X-ray source of claim 1, wherein a surface of the anode target has a concave shape. 12. The X-ray source of claim 1, wherein the emitter includes a first emitter, which is relatively adjacent to the shielding channel, and a second emitter, which is relatively spaced apart from the shielding channel, the opening includes a first gate hole corresponding to the first emitter and a second gate hole corresponding to the second emitter, center axes of the second emitter and the second gate hole correspond to each other, and the first emitter is positioned while being slant to the shielding channel. 13. The X-ray source of claim 1, further comprising:a focusing electrode positioned between the gate electrode and the anode. 14. An X-ray device, comprising:a plurality of X-ray sources, each of which includes a cathode including a shielding channel, through which an X-ray passes, emitters formed on an upper surface of the cathode and arranged around the shielding channel, an anode positioned so as to face the cathode and including an anode target in which an E-beam is focused, and a gate electrode positioned between the cathode and the anode, and including gate holes at positions corresponding to those of the emitters,wherein the plurality of X-ray sources is arranged in an array form. 15. The X-ray device of claim 14, wherein the plurality of X-ray sources are sealed, respectively. 16. The X-ray device of claim 14, wherein the cathode, the anode, and the gate electrode have a plate form, and the cathode includes a plurality of shielding channels. 17. The X-ray device of claim 16, wherein the cathodes included in the plurality of X-ray sources are electrically separated for each array, and are controlled in a unit of an array.