Back to results
US 4,059,388 AGranted
Photoflash lamp
AssigneeGTE Sylvania Incorporated
InventorJohn W. Shaffer
Life of this patent
Estimating the term…
Abstract
A high-voltage type photoflash lamp having an ignition structure comprising a mass of primer material bridging a pair of lead-in wires, one of which is enclosed in an insulating sleeve. The lamp contains a quantity of shredded metallic combustible and an amount of oxygen in excess of that needed to completely burn the combustible so as to burn back the unsleeved lead-in wire during flashing. The primer material comprises a mixture of combustible metal powder, one or more metal oxides and a binding agent and is free of oxidizer salts.
Claims12
A photoflash lamp comprising:
- an hermetically sealed, light-transmitting envelope;
- a quantity of filamentary combustible material located within said envelope;
- a combustion-supporting gas in said envelope at an initial fill pressure exceeding one atmosphere;
- and a non-filament type ignition means disposed in said envelope in operative relationship with respect to said combustible fill material and adapted to be ignited by a high voltage pulse, said ignition means including a pair of lead-in wires extending into said envelope in a spaced relationship, and a mass of primer material covering a portion of at least one of said lead-in wires within said envelope, said primer material comprising a particulate fuel, one or more oxides of metals having a boiling point substantially above 2097.degree. C, said metal oxides being substantially nonconductive electrically and having a lower free energy of formation than the oxides of said fuels, and a binding agent, said primer material being free of oxidizer salts.
1 more element
Dependencies are inferred from the claim text.