Electric lamp and discharge devices – Cathode ray tube – Electron permeable window
Patent
1993-04-12
1995-02-21
Brinich, Stephen
Electric lamp and discharge devices
Cathode ray tube
Electron permeable window
313458, H01J 3300
Patent
active
053919580
ABSTRACT:
An electron tube having a hole or "window" covered by a thin, electron permeable membrane is provided with means for minimizing stress concentration in the membrane adjacent the periphery of the hole, thereby relieving stress concentrations which would otherwise occur when the membrane is forced inwardly into the hole by atmospheric or other pressure on the exterior of the tube. In a manufacturing method, a polymeric ring may be provided between the membrane and the exterior wall of the tube. The polymeric ring, desirably a polyimide has a glass transition temperature less than the elevated temperature used to expel volatile materials from the interior of the tube. The polymeric ring substantially relieves stresses induced by differential thermal expansion or contraction at temperatures between the glass transition temperature and the elevated temperature, as during cooling following the volatile removal step.
REFERENCES:
patent: 2990493 (1961-06-01), Seehof et al.
patent: 3105916 (1963-10-01), Marker et al.
patent: 3211937 (1965-10-01), Hester et al.
patent: 3406304 (1968-10-01), Brewster
patent: 3531340 (1970-09-01), Bunshah et al.
patent: 3788892 (1970-05-01), Van Raalte et al.
patent: 4222815 (1980-09-01), Krechmery
patent: 4333036 (1982-06-01), Farrell
patent: 4362965 (1982-12-01), Kendall
patent: 4468282 (1984-08-01), Neukermans
patent: 4494036 (1985-01-01), Neukermans
patent: 4523974 (1985-06-01), Duly et al.
patent: 4591756 (1986-05-01), Avnery
patent: 4631444 (1986-12-01), Cheever
patent: 4680243 (1987-07-01), Shimkunas et al.
patent: 4721967 (1988-01-01), Roche
patent: 5030318 (1991-07-01), Reche
Reprinted From Engineered Materials Handbook, vol. 3: Adhesives And Sealants, Entitled "Polyimides" by Robert D. Rossi, 1991 by ASM International.
National Starch and Chemical Company, Thermid Polyimides, Entitled "Thermid EL-5000 Series", Polyimide Process Guide.
Brinich Stephen
Charged Injection Corporation
LandOfFree
Electron beam window devices and methods of making same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electron beam window devices and methods of making same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron beam window devices and methods of making same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933208