The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 2013
Filed:
Oct. 02, 2012
Canon Kabushiki Kaisha, Tokyo, JP;
Kazuhiro Sando, Atsugi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrostatic lens includes multiple electrodes each having a through hole, and an insulating spacer that is provided between the electrodes and that fixes an interval between the electrodes. Both surfaces of the spacer are bonded with the electrodes opposing each other so that the spacer is integral with both the electrodes. A protective film is disposed on both surfaces of each of the electrodes. The protective film is present on the interior wall of the through hole and in a region around the through hole on the surface of the electrode. The region extends continuously from the interior wall to an end portion of the electrode. The protective film is not present at an interface between the electrode and the spacer.