Apparatus with a cap and cover assembly, an electron gun...

Details Apparatus with a cap and cover assembly, an electron gun... Apparatus with a cap and cover assembly, an electron gun...

2005-06-28

2005-06-28

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C313S417000, C313S455000, C313S456000, C313S459000, C313S438000, C313S482000, C313S250000, C445S033000, C445S034000, C250S427000, C250S42300F

Reexamination Certificate

active

06911770

ABSTRACT:
A cap can comprise an aperture, and an attenuator may block the aperture during at least one point in time. In one embodiment, the attenuator can include a cover that may be displaced by a spring. In another embodiment, such as an electron gun, may comprise a support cap with an aperture, a displaceable cover that may cover the aperture, and a spring. A material attached to the spring and acting as a fuse may release the spring and expose the aperture after an electrical current blows the “fuse”. In yet another embodiment, a method for using a tube may comprise evacuating the tube while a cover covers an aperture in the support cap of a electron gun that is at least partially in the tube and moving the cover to expose the aperture after the tube is sealed.

REFERENCES:
patent: 4323813 (1982-04-01), Vieland et al.
patent: 4451242 (1984-05-01), Miyazawa et al.
patent: 5075588 (1991-12-01), Hunter

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