Patent ID: 9159533
Filing Date: 2015-10-13
Classification: G01N,H01J

Abstract:
1. A charged particle beam apparatus for detecting secondary charged particles or tertiary charged particles generated in response to irradiating a sample with a primary charged particle beam, the charged particle beam apparatus comprising: an objective lens that focuses the primary charged particle beam on the sample; a power supply unit that applies a retarding voltage to the sample; and a detector that is disposed above the objective lens and detects the secondary charged particles or the tertiary charged particles, wherein the objective lens includes: an opening through which the primary charged particle beam passes; an upper magnetic pole member disposed around a central axis passing through the opening and in which a magnetic flux supplied from an excitation member operates as an upper magnetic pole of the objective lens; and a lower magnetic pole member disposed around the central axis passing through the opening, having a lower surface that is opposed to an upper surface of the sample, and operating as a lower magnetic pole that corresponds to the upper magnetic pole, wherein an upper surface of the lower magnetic pole member to which the magnetic flux is supplied and a surface which supplies the magnetic flux to the lower magnetic pole member are disposed so as to face each other in a thickness direction.