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US 5,686,786 AGranted
Light bulb with glass envelope having light transmission of a wavelength only up to 700mm
AssigneeIllumination Technology, Inc.
InventorsWilliam Joseph Lang, John B. Hartley, Ralph E. Johnson
Life of this patent
Estimating the term…
Abstract
A light bulb that is suitable for use in conjunction with night vision equipment has an incandescent filament enclosed in a glass envelope that transmits substantially no detectable amount of light of a wave length greater than 700 nanometers.
Claims21
An incandescent lamp suitable for use in conjunction with night vision equipment, the lamp comprising:
- a glass envelope that transmits substantially no light energy of a wavelength greater than 700 nanometers;
- a filament mounted within the interior of the glass envelope;
- a pair of metal contact pins supporting the filament and in electrical contact therewith, the pins being disposed partially enclosed within the envelope and partially outside of the envelope whereby the lamp can be energized through contacting the pins with a voltage source, and
- means for hermetically sealing the envelope, the means being substantially non-transparent to light of a wavelength greater than 700 nanometers.
1 more element
An incandescent lamp suitable for use in conjunction with night vision equipment, the lamp comprising:
- a substantially cylindrical glass envelope that transmits substantially no light energy of a wavelength greater than approximately 640 nanometers, the glass envelope having a first opening at its first end and a second opening at its second end;
- a glass rod that transmits substantially no light energy of a wavelength greater than approximately 640 nanometers, dimensioned to fit into the first opening of the glass envelope and heat-sealed therein to hermetically close-off the same;
- a filament mounted within the interior of the glass envelope;
- a pair of metal contact pins supporting the filament and in electrical contact therewith, the pins being disposed partially enclosed within the envelope and partially outside of the envelope whereby the lamp can be energized through contacting the pins with a voltage source, and
- a glass bead that transmits substantially no light at any wavelength, dimensioned to fit into the second opening of the glass envelope and heat-sealed therein to hermetically close-off the same, the pins penetrating through the glass bead being heat-sealed thereinto.
2 more elements
An incandescent lamp suitable for use in conjunction with night vision equipment, the lamp comprising:
- a substantially dome-shaped glass envelope that transmits substantially no light energy of a wavelength greater than approximately 640 nanometers, the glass envelope having a single opening;
- a filament mounted within the interior of the glass envelope;
- a pair of metal contact pins supporting the filament and in electrical contact therewith, the pins being disposed partially enclosed within the envelope and partially outside of the envelope whereby the lamp can be energized through contacting the pins with a voltage source, and
- a glass bead that transmits substantially no light at any wavelength, dimensioned to fit into the opening of the glass envelope and heat-sealed therein to hermetically close-off the same, the pins penetrating through the glass bead being heat-sealed thereinto.
1 more element
Dependencies are inferred from the claim text.