Patent Number: 
Section: claims

1. A sample holder for holding a sample to be observed in an electron microscope, comprising: a sample mount on which said sample is affixed; and  a rotation driving mechanism for rotating said sample mount about a predetermined axis in the range of 0 to 360xc2x0,  wherein said predetermined axis extends along a direction other than a direction of electron beam incidence in said electron microscope, a position of said electron beam incidence in said sample being changed as said sample mount rotates. 2. The sample holder according to  claim 1 , further comprising: claim 1 a cartridge portion coupled to said sample mount; and  a fixed portion coupled to a main body of said sample holder,  wherein said cartridge portion can be attached to and removed from said fixed portion. 3. A sample mount jig for grasping and holding a sample mount provided in a sample holder for holding a sample to be observed in an electron microscope, said sample mount jig comprising: a protecting portion for covering said sample affixed on said sample mount when said sample mount jig is grasping said sample mount; and  a grip portion fixed to said protecting portion. 4. The sample mount jig according to  claim 3 , wherein said protecting portion has a fitting part in which said sample mount fits. claim 3 5. A sample mount on which a sample to be observed is affixed and which is provided in a sample holder for holding said sample in an electron microscope, said sample mount comprising: a mount plate having a gap whose width is narrower than the length of said sample, for supporting said sample affixed thereon,  wherein said sample is laid over opposite portions of said gap of said mount plate, and wherein said gap extends throughout a thickness of said mount plate and extends from an end of said mount plate. 6. The sample mount according to  claim 5 , wherein said sample mount is composed of said mount plate and a support plate for supporting said mount plate, said mount plate and said support plate being combined in the shape of L in section. claim 5 7. The sample mount according to  claim 5 , wherein said mount plate is in the form of a flat plate. claim 5 8. A sample holder for holding a sample to be observed in an electron microscope, comprising: a sample mount composed of a mount plate on which said sample is affixed and supported and a support plate for supporting said mount plate, said mount plate and said support plate being are combined in the shape of L in section; and  a holding portion for holding said support plate of said sample mount,  wherein said mount plate has a gap whose width is narrower than the length of said sample and said sample is laid over opposite portions of said gap of said mount plate,  wherein said gap extends throughout a thickness of said mount plate and extends from an end of said mount plate. 9. The sample holder according to  claim 8 , wherein said holding portion holds said sample mount in such a manner that a part of said mount plate where said sample is affixed protrudes from said sample holder. claim 8 10. The sample holder according to  claim 8 , wherein said holding portion comprises, claim 8 a first holding portion for holding said support plate in such a manner that a normal direction of said mount plate extends along a direction of electron beam incidence in said electron microscope,  a second holding portion for holding said support plate in such a manner that said normal direction of said mount plate extends along a first direction which is vertical to said direction of the electron beam incidence, and  a third holding portion for holding said support plate in such a manner that said normal direction of said mount plate extends along a second direction which is vertical to both of said direction of the electron beam incidence and said first direction. 11. The sample holder according to  claim 8 , wherein said holding portion holds said support plate in such a manner that a normal direction of said mount plate extends along a direction of electron beam incidence in the electron microscope or along a first direction which is vertical to said direction of the electron beam incidence and said holding portion can be rotated in the range of 0 to 360xc2x0 about an axis extending along said first direction. claim 8 12. A sample holder for holding a sample to be observed in an electron microscope, comprising: a sample mount on which said sample is affixed;  a rotation driving mechanism for rotating said sample mount about a predetermined axis in the range of 0 to 360xc2x0;  a cartridge portion coupled to said sample mount; and  a fixed portion coupled to a main body of said sample holder,  wherein said cartridge portion can be attached to and removed from said fixed portion,  wherein said rotation driving mechanism transmits power from said fixed portion to said cartridge portion, and  wherein said rotation driving mechanism rotates said sample mount in the range of 0 to 360xc2x0 about an axis extending along a direction other than a direction of electron beam incidence in said electron microscope.