Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Reexamination Certificate
2011-05-10
2011-05-10
Roy, Sikha (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
C445S046000, C445S050000, C445S058000, C313S356000, C313S355000
Reexamination Certificate
active
07938707
ABSTRACT:
Methods are disclosed for batch fabrication of vacuum switch tubes that reduce manufacturing costs and improve tube to tube uniformity. The disclosed methods comprise creating a stacked assembly of layers containing a plurality of adjacently spaced switch tube sub-assemblies aligned and registered through common layers. The layers include trigger electrode layer, cathode layer including a metallic support/contact with graphite cathode inserts, trigger probe sub-assembly layer, ceramic (e.g. tube body) insulator layer, and metallic anode sub-assembly layer. Braze alloy layers are incorporated into the stacked assembly of layers, and can include active metal braze alloys or direct braze alloys, to eliminate costs associated with traditional metallization of the ceramic insulator layers. The entire stacked assembly is then heated to braze/join/bond the stack-up into a cohesive body, after which individual switch tubes are singulated by methods such as sawing. The inventive methods provide for simultaneously fabricating a plurality of devices as opposed to traditional methods that rely on skilled craftsman to essentially hand build individual devices.
REFERENCES:
patent: 4673842 (1987-06-01), Grieger et al.
patent: 5075594 (1991-12-01), Schumacher et al.
patent: 5550430 (1996-08-01), Navaroli et al.
patent: 5725408 (1998-03-01), Boettcher
patent: 5739637 (1998-04-01), Boettcher
patent: 6657370 (2003-12-01), Geusic
patent: 7297041 (2007-11-01), Eden et al.
patent: 2002/0036461 (2002-03-01), Schoenbach et al.
patent: 2005/0148270 (2005-07-01), Eden et al.
patent: 2007/0017636 (2007-01-01), Goto et al.
Bunch, K.J. et al., “Investigation Into Carbon-Trigger Vacuum Switches for High-Voltage, High-Current Switch Applications”, 7th IEEE International Vacuum Electronics Conference (IVEC), Monterey, CA, US, Apr. 25-27, 2006.
Walker, C.A. et al., “Comparison of Metal-Ceramic Brazing Methods”, 36th International Brazing and Soldering Symposium, Chicago, IL, US, Nov. 13-14, 2007.
Burkes, T.R. et al., “A Review of High-Power Switch Technology”, IEEE Transactions on Electron Devices, vol. Ed-26, No. 10, Oct. 1979.
Chu, K.W. et al., “A Comparison of High-Voltage Switches”, SAND99-0154, Feb. 1999. (Sandia Corporation Internal Report, publicly available through OSTI).
U.S. Appl. No. 11/231,915, filed Sep. 21, 2005, Roesler et al.
Dunaevsky, Lifetime of ferroelectric cathodes, Journal of Applied Physics, vol. 89, No. 8, Apr. 15, 2001, 4480-4485.
Davidson, Diamond field emission devices, Diamond and Related Materials 12, (2003), 429-433.
Chung, Theoretical Study of Triple Junction Electron Emission for a New Type of Cold Cathode, Department of Physics, Pennsylvania State Univeraity, University Park, PA16802,US, Apr. 25-27, 2006.
Schachter, Analytic expression for triple-point electron emission from an ideal edge, Appl. Phys. Lett. 72, (4), Jan. 26, 1998, 421-423.
Advani, Kiloampere and Microsecond Electron Beams from Ferroelectric Cathodes, IEEE Transactions on Plasma Science, vol. 26, No. 4, Aug. 1998, 1348-1352.
Peterson, Macro-Meso-Microsystems Integration in LTCC: LDRD Report, Sandia Report, SAND2007-1871, Sandia National Laboratories, Mar. 2007.
Rosenman, Electron emission from ferroelectrics, Journal of Applied Physics, vol. 88, No. 11, Dec. 1, 2000, 6109-6161.
Riege, Electron emission from ferroelectrics—a review, Nuclear Instruments and Methods in Physics Research A 340 (1994) 80-89, North Holland.
Krasik, Application of a ferroelectric plasma cathode as a high-current switch, The European Physical Journal D, 19, 89-95 (2002).
Trowbridge Frank R.
Walker Charles A.
Roy Sikha
Sandia Corporation
Tsai Olivia J.
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