John A David

US Patent:

8547006, Oct 1, 2013

Filed:

Feb 12, 2010

Appl. No.:

12/705160

Inventors:

R. Lawrence Ives - San Mateo CA, US
Hien T. Tran - Cary NC, US
Thuc Bui - Mountain View CA, US
Adam Attarian - Raleigh NC, US
William Tallis - Cary NC, US
John David - Wooster OH, US
Virginia Forstall - Fairfax VA, US
Cynthia Andujar - Cary NC, US
Noah T. Blach - Chapel Hill NC, US
David B. Brown - Raleigh NC, US
Sean E. Gadson - Columbia SC, US
Erin M. Kiley - Loudon NH, US
Michael Read - Plainfield VT, US

Assignee:

Calabazas Creek Research, Inc. - San Mateo CA

International Classification:

H01J 29/02

US Classification:

313414, 313409, 313383, 313389, 313446

Abstract:

A multi-beam electron gun provides a plurality N of cathode assemblies comprising a cathode, anode, and focus electrode, each cathode assembly having a local cathode axis and also a central cathode point defined by the intersection of the local cathode axis with the emitting surface of the cathode. Each cathode is arranged with its central point positioned in a plane orthogonal to a device central axis, with each cathode central point an equal distance from the device axis and with an included angle of 360/N between each cathode central point. The local axis of each cathode has a cathode divergence angle with respect to the central axis which is set such that the diverging magnetic field from a solenoidal coil is less than 5 degrees with respect to the projection of the local cathode axis onto a cathode reference plane formed by the device axis and the central cathode point, and the local axis of each cathode is also set such that the angle formed between the cathode reference plane and the local cathode axis results in minimum spiraling in the path of the electron beams in a homogenous magnetic field region of the solenoidal field generator.

US Patent:

20030084275, May 1, 2003

Filed:

Oct 31, 2001

Appl. No.:

10/001697

Inventors:

John David - Raleigh NC, US
Robert Russell - Cary NC, US
David Steiner - Raleigh NC, US

Assignee:

International Business Machines Corporation; - Armonk NY

International Classification:

G06F015/177

US Classification:

713/001000

Abstract:

A method, computer program product and system for storing or updating authentications, e.g., passwords, in a boot code image, i.e., binary executable boot code, stored within a Read Only Memory (ROM), e.g., flash ROM, of a terminal from a remote central site. An authentication may be stored in the boot code image in a terminal from a central site by creating a file comprising a boot code image storing the authentication at the central site and then storing the created file in ROM in the terminal. The file may be downloaded from a server at the central site to the terminal. An authentication in the boot code image in a terminal may be updated remotely from a central site by updating the file associated with the boot code image, i.e., updating the authentication, at the central site and then downloading the updated file to the terminal.