본 발명은 엑스선 튜브에 관한 것으로, 구체적으로 자기 렌즈 등 전자빔 집속에 필요한 구성 요소를 제거하고, 단순한 구조로 나노미터 급 크기의 포컬 스팟(focal spot)을 갖는 엑스선을 발생시키는 엑스선 튜브에 관한 것이다. 이에 따른 본 발명은, 전자빔을 방출하는 전자빔 발생부, 상기 전자빔 발생부에서 방출된 전자빔을 제한하는 제한 전극부 및 상기 제한된 전자빔이 충돌하여 엑스선을 방출하는 타겟 물질을 포함하는 타겟부로 구성되되, 상기 제한 전극부는, 상기 방출된 전자빔 중 일부의 전자빔을 통과시켜 상기 타겟부로 전달하는 전자빔 제한 전극으로 구성되는 것을 특징으로 하는 엑스선 튜브에 관한 것이다.
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