Patent ID: 9117625
Filing Date: 2015-08-25
Classification: B82Y,H01J

Abstract:
1. An electrostatic lens comprising a plurality of substrates that each includes an insulating plate in which: a plurality of through holes that allow an electron beam to pass through are formed, a plurality of electrodes are formed on an inner wall of the plurality of through holes, and a plurality of wirings are formed on the insulating plate and are electrically connected to each of the electrodes, wherein the plurality of electrodes are electrically independent from each other, and wherein a stack body is formed by stacking the plurality of substrates, and a frame that surrounds the stack body in plan view is further provided, and wherein the frame includes a first plate and a second plate which are connected to each other and is configured such that an end face which is perpendicular to one main surface of the second plate is abutted against part of one main surface of the first plate at a connecting section between the first plate and the second plate, and the stack body is configured such that a first side face is abutted against the one main surface of the first plate and a second side face which is perpendicular to the first side face is abutted against the one main surface of the second plate thereby providing alignment of through holes of respective substrates.