Patent ID: 7329878

Claim:
A method for manufacturing a lens assembly of an electron beam microcolumn having a plurality of microlenses each provided with a hole at a central position thereof, and a plurality of insulating layers alternately interposed between the microlenses, the method comprising: forming at least one first microlens assembly set by anodic-bonding an insulating layer and a microlens together so that a part of a surface of the insulating layer is not covered with the microlens; layering the first microlens assembly set on a second microlens or a second microlens assembly set while aligning the holes of the microlenses, so that the second microlens or the microlens of the second microlens assembly set is in contact with the insulating layer of the first microlens assembly set, while the part of the insulating layer of the first microlens assembly set not covered by the first microlens is in contact with the second microlens or the microlens of the second microlens assembly set; and scanning a laser beam to bond the part of the insulating layer of the first microlens assembly set not covered by the first microlens to the second microlens or the microlens of the second microlens assembly set by passing the laser beam through the part of the insulating layer of the first microlens assembly set, thus welding the first microlens assembly set to the second microlens or the microlens of the second microlens assembly set.