Patent ID: 6927533
Filing Date: 2005-08-09
Classification: H01J

Abstract:
1. An electron beam apparatus including a hermetic container provided with an electron source, wherein said hermetic container comprises a base member and a charging prevention film on said base member, said film comprising first and second materials of which electron densities are different from each other, said first and second materials constituting mutually a three dimensional network structure, and a value of an incident angle multiplication coefficient m 0 of said film, which is a parameter of the following formula, is 10 or less, when obtained from a value of a secondary electron emission coefficient measured under conditions that an incident energy is 1 keV and an incident angle is 0 degrees as well as values measured under conditions that the incident energy is 1 keV and incident angles θ are 20, 40, 60, and 80 degrees by conducting a regression analysis by a least square method in the formula, provided that the secondary electron emission coefficient of a surface of the film has two incident energies which satisfy a condition that the secondary electron emission coefficient δ=1, under vertical incident conditions, and that when a larger one of the two incident energies satisfies a condition that δ=1, referred to as a second cross-point energy, secondary electron emission coefficients for primary electrons whose incident angles are θ and 0 degrees are represented by δ θ , δ 0 , respectively, and m 1 , m 2 , have values m 1 =0.68273, m 2 =0.86212, respectively, in the incident energy equal to or lower than the second cross-point energy.