Patent Number: 
Section: claims

1. A detector for an electron column, which is made of conductive material in a mesh form, made from an arrangement of one or more conductive wires, or a conductive plate shape, and which is located and used directly above a sample, wherein the detector directly receives and transmits electrons generated by an electron beam in an electron column to an outside without amplifying the detected electrons, as a transmission of data about the electric current, and wherein the electron beam is radiated through a space between the conductive wires. 2. The detector as set forth in claim 1, wherein the detector has a two-dimensional or three-dimensional structure formed of one conductive wire. 3. A method of detecting electrons generated by an electron beam in an electron column, the method comprising steps for:receiving directly electrons generated by an electron beam in an electron column, andtransmitting the electrons directly to an outside, as a transmission of data about the electric current, without amplifying the detected electrons. 4. The method as set forth in claim 3, wherein the detector comprises a detector for an electron column, which is made of conductive material in a mesh form, made from an arrangement of one or more conductive wires, or a conductive plate shape, and which is located and used directly above a sample. 5. The method as set forth in claim 3, wherein the detector is wired through a conductive part of a sample using a sample current method and performs detection. 6. The method as set forth in claim 5, wherein the detection is performed by applying negative voltage to the sample. 7. The method as set forth in claim 3, wherein the detector detects electrons from electron beams which are generated by a plurality of electron columns, and the detector performs detection while the electron columns are sequentially operated. 8. The method as set forth in claim 3, wherein the detector comprises a detector for an electron column, which is made of conductive material in a mesh form, made from an arrangement of one or more conductive wires, or a conductive plate shape, and which is located and used directly above a sample, and wherein the detector has a two-dimensional or three-dimensional structure formed of one conductive wire. 9. The method as set forth in claim 4, wherein the detector detects electrons from electron beams which are generated by a plurality of electron columns, and the detector performs detection while the electron columns are sequentially operated. 10. The method as set forth in claim 5, wherein the detector detects electrons from electron beams which are generated by a plurality of electron columns, and the detector performs detection while the electron columns are sequentially operated. 11. The method as set forth in claim 6, wherein the detector detects electrons from electron beams which are generated by a plurality of electron columns, and the detector performs detection while the electron columns are sequentially operated. 12. The method as set forth in claim 8, wherein the detector detects electrons from electron beams which are generated by a plurality of electron columns, and the detector performs detection while the electron columns are sequentially operated.