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:
Oct. 19, 1999
Filed:
Dec. 09, 1997
Michael A Kelly, Portola Valley, CA (US);
Other;
Abstract
A charged-particle analyzer in which a solenoid or other means set up a generally axial magnetic field in a drift region. Meshes of magnetically permeable material are set at ends of the drift region to terminate the magnetic field. Charged particles, such as electrons, are incident upon entrance mesh at a given angle with respect to the central axis. After passing through the entrance mesh, they gyrate around the magnetic field lines, and they then exit the drift region through the exit mesh. The rotation accumulated across the drift region depends upon the energy of the incident particle, and the angle of the particle trajectory exterior of the exit mesh thus depends on the particle's energy. A charged-particle detector detects the position of the particle relative to the central axis and, hence, its energy. In one embodiment, the meshes are flat so that a uniform magnetic field is created in the drift region. In another embodiment, the meshes are curved and may act as charged-particle lenses with focal planes at the particle source and at the detector.