Patent ID: 6334258
Filing Date: 2002-01-01
Classification: G01B

Abstract:
An inspection device in conjunction with a piece of aperture graphite of an extraction electrode, whereinthe piece of aperture graphite comprises a to-be-examined curve and a to-be-examined engagement portion, the inspection device comprises at least one sidewall surface having a standard curve marked thereon, the inspection device further comprises at least one examination engagement portion having a predetermined positional relationship with the at least one sidewall surface so that after the to-be-examined engagement portion of the piece of aperture graphite is engaged with the at least one examination engagement portion, and after the to-be-examined curve is projected onto said at least one sidewall surface, an amount of wear of the aperture graphite is clearly visible according to differences between said to-be-examined curve and said standard curve, and the differences between said projected to-be-examined curve and said standard curve comprises an area size difference defined by the area enclosed by said projected to-be-examined curve on said standard curve marked on said at least one sidewall surface, and a maximum distance difference defined by a maximum distance between said projected to-be-examined curve and said standard curve.