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US 8,308,520 B2Granted
Cathodoluminescent phosphor lamp having extraction and diffusing grids and base for attachment to standard lighting fixtures
AssigneeVu1 Corporation
InventorsCharles E. Hunt, Bearnard K. Vancil, Richard N. Herring, Richard Gale Sellers
Life of this patent
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Abstract
A light emitting device has a cathode-ray tube and power supply. The cathode-ray tube in an embodiment is optimized for emitting a broad electron beam, in one variation a dome-shaped diffusing grid is used to spread the beam. In another embodiment, the device has a base adapted for attachment to a standard lighting fixture.
Claims2
A method for generating light, comprising:
- providing a light emitting device, the light emitting device prepared by a method comprising:
- forming an anode by depositing a cathodoluminescent (CL) phosphor on an inside of a front surface of a transparent envelope and depositing a conductive coating contacting the CL phosphor;
- fabricating an electron gun assembly, comprising:
- fabricating an electron gun having a diffusing grid, an extraction grid, a suppressor ring, and a cathode, the suppressor ring laterally surrounding the cathode, and
- attaching at least the electron gun to electrical feedthroughs of a glass pump stem;
- inserting the electron gun assembly into the glass envelope and sealing the glass envelope to the glass pump stem;
- evacuating the glass envelope;
- and
- fabricating a base assembly, the base assembly having a high voltage power supply;
- and
- forming the light emitting device by attaching the glass assembly to the base assembly;
- electrically coupling the suppressor ring to the cathode;
- applying a first voltage to the extraction grid and diffusing grid, the extraction grid and diffusing grid being biased positive with respect to the cathode of the electron gun;
- and
- using the high voltage power supply to apply a high voltage to the anode, thereby accelerating electrons emitted by the electron gun to the anode thereby diffusely stimulating the CL phosphor to emit light.
12 more elements
A method for fabricating a light emitting device comprising:
- forming an anode by depositing a cathodoluminescent (CL) phosphor on an inside of a front surface of a glass envelope and depositing a conductive coating contacting the CL phosphor;
- fabricating an electron gun assembly, comprising:
- fabricating an electron gun having a diffusing grid, an extraction grid, a suppressor ring, and a cathode, the suppressor ring laterally surrounding the cathode, and the extraction grid electrically coupled to the diffusing grid, and
- attaching the electron gun to electrical feedthroughs of a glass pump stem;
- inserting the electron gun assembly into the glass envelope and sealing the glass envelope to the glass pump stem;
- evacuating the glass envelope;
- and
- fabricating a base assembly, the base assembly having a high voltage power supply;
- and
- forming the light emitting device by attaching the glass assembly to the base assembly such that the high voltage power supply is coupled to provide high voltage to the anode.
7 more elements
Dependencies are inferred from the claim text.