David S Jun

US Patent:

6771013, Aug 3, 2004

Filed:

Oct 16, 2001

Appl. No.:

09/981663

Inventors:

Gerald G. Magera - Portland OR
Gregory A. Schwind - Portland OR
James B. McGinn - Portland OR
David S. Jun - Portland OR

Assignee:

FEI Company - Hillsboro OR

International Classification:

H01J 116

US Classification:

313336, 313271, 31331801

Abstract:

A low input power consumption, compact thermal field emitter is suitable for use in electron beam systems, particularly those systems that use an array of electron beams or a miniature electron beam system. The thermal field emitter design reduces heat loss by reducing heat transfer to the base. To achieve reduced loses the design incorporates the use of high electrical resistivity, low thermal conductivity materials for construction of the filament posts and the filaments. Such materials further reduce heat loss and reduce input current requirements. In one embodiment, the base includes counterbores that reduce the heat conduction path between the filament posts and the base, and moves the contact area further from the filament.

US Patent:

6798126, Sep 28, 2004

Filed:

May 3, 2002

Appl. No.:

10/138708

Inventors:

Gregory A. Schwind - Portland OR
David S. Jun - Portland OR
Gerald G. Magera - Portland OR

Assignee:

FEI Company - Hillsboro OR

International Classification:

H01J 114

US Classification:

313309, 313336, 313311, 313346 R, 313351, 445 50, 445 51

Abstract:

An electron emitter is produced by applying a work function lowering material that does not require an extensive heating step before the material will function to lower the work function. By eliminating the extensive heating step, a small radius, highly tapered emitter tip will retain its shape to consistently produce a high angular intensity at a reasonable output power level.

US Patent:

7064477, Jun 20, 2006

Filed:

Aug 2, 2004

Appl. No.:

10/909621

Inventors:

Gerald G. Magera - Hillsboro OR, US
Gregory A. Schwind - Hillsboro OR, US
James B. McGinn - Hillsboro OR, US
David S. Jun - Hillsboro OR, US

Assignee:

FEI Company - Hillsboro OR

International Classification:

H01J 9/02
H01J 1/88

US Classification:

313336, 313275, 313271, 445 50, 445 46

Abstract:

A low input power consumption, compact thermal field emitter is suitable for use in electron beam systems, particularly those systems that use an array of electron beams or a miniature electron beam system. The thermal field emitter design reduces heat loss by reducing heat transfer to the base. To achieve reduced loses the design incorporates the use of high electrical resistivity, low thermal conductivity materials for construction of the filament posts and the filaments. Such materials further reduce heat loss and reduce input current requirements. In one embodiment, the base includes counterbores that reduce the heat conduction path between the filament posts and the base, and moves the contact area further from the filament.

US Patent:

20030122706, Jul 3, 2003

Filed:

Sep 24, 2002

Appl. No.:

10/049465

Inventors:

Hee Choi - Seoul, KR
David Jun - Portland OR, US
Peter Jun - Tualatin OR, US
William Jun - Tualatin OR, US

International Classification:

G01S005/14

US Classification:

342/357100

Abstract:

The purpose of the invention is to maximize and to optimize an intelligent and multipurpose functions for network by using a hybrid method, supplementing a re-transmission function, of improved bidirectional GPS (Global Positioning System) with the existing Cellular/PCS (Personal Communications Services). The invention, a hybrid method of combining Cellular/PCS and improved bidirectional GPS, manipulates as follows: GPS signals can be used independently, received from a Receiver (1) through a GPS (2) by using data stored on EEPROM (Electrically Erasable Programmable Read Only Memory) (4) via a Signal Hybrid Processor (3); an External I/O Interface (8) can retransmit time marked, status and operations and Function Manager (5) can also re-transmit various states of the PCS (Event Marking) as well as coordinate signals connected to Cellular/PCS network; Coordinates of User (a) are transferred Transmitter (1) and Antenna (A) and can call to user (b) simultaneously; In this case, coordinates of User (a) are converted to ASCII codes in DB (Data Base) of station, and display into User (b) with Use (a) ID (Identification) and real locations like address (street name and so on), such a way that shows as following. Receiver (B)→RF (Radio Frequency)/IF (Intermediate Frequency) (C)→Baseband Processor (D)→Display Device (7). This Hybrid Method implements a data base from t acquired data on network for various intelligent functions.

US Patent:

6680562, Jan 20, 2004

Filed:

Aug 15, 2000

Appl. No.:

09/639451

Inventors:

James B. McGinn - Portland OR
Sander G. den Hartog - Eindhoven, NL
David S. Jun - Portland OR
Gerald G. Magera - Portland OR
Gregory A. Schwind - Portland OR

Assignee:

FEI Company - Hillsboro OR

International Classification:

H01J 116

US Classification:

313326, 313336

Abstract:

A electron emission cathode includes an emitter having an apex from which electrons are emitted. The emitter is attached to a heating filament at a junction and extends from the junction both forward toward the apex and rearward. A reservoir of material that lowers the work function of the emitter is positioned on the rearward extending portion of the emitter. By positioning the reservoir on the rearward extending portion, the reservoir can be positioned sufficiently far from the junction to reduce its temperature and thereby greatly increase the useful life, of the emitter without adversely affected the emission characteristics of the source.