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US 4,229,161 AGranted
Photoflash lamp and method of making
AssigneeGTE Products Corporation
InventorsAndre C. Bouchard, Lawrence R. Fraley
Life of this patent
Estimating the term…
Abstract
An electrically-activated photoflash lamp which includes a thin member (e.g. a mica disk) therein located between the lamp's combustible shreds and primer material. The disk prevents the shreds from contacting the primer material and any portions of the lamp's electrical conductors which have access to the interior of the envelope. A method of making the lamp is also provided.
Claims17
A photoflash lamp comprising:
- a hermetically-sealed, light-transmitting envelope including a combustion-supporting atmosphere therein;
- a quantity of filamentary combustible material located within said envelope;
- ignition means for igniting said combustible material, said ignition means including a pair of electrical conductors sealed within said envelope and projecting therefrom, each of said conductors including an end portion having access to the interior of said envelope, and a mass of primer material located within said envelope in electrical contact with said end portions of said electrical conductors;
- and
- a thin member positioned within said envelope and dividing said envelope into first and second portions, said first portion containing said combustible material and said second portion containing said end portions of said electrical conductors and said primer material and being void of filamentary combustible material, said thin member preventing said combustible material from electrically contacting said end portions and said primer material;
- means forming a passage between said first and second portions of said envelope for ignition of said filamentary material by said primer material.
3 more elements
A method of making a photoflash lamp, said method comprising:
- providing a tubular, light-transmitting member having first and second open ends;
- positioning a pair of spaced-apart electrical conductors within a first of said open ends;
- hermetically sealing said first open end to include said conductors therein such that each of said conductors project therefrom and include an end portion having acess to the interior of said tubular member;
- positioning a mass of primer material in electrical contact with said end portions of said conductors through said second open end;
- locating a thin member within said tubular, light-transmitting member through said second open end to divide said light transmitting member into first and second portions;
- positioning a quantity of filamentary combustible material within said first portion of said tubular, light-transmitting member through said second open end;
- introducing a combustion-supporting atmosphere within said tubular, light-transmitting member through said second open end;
- and
- sealing said second end to define a hermetically-sealed envelope, said thin member positioned within said envelope between said filamentary, combustible material and said end portions of said electrical conductors and said primer material to prevent said combustible material from electrically contacting said end portions and said primer material, said second portion of said envelope being void of filamentary combustible material;
- and providing passage means between the first and second portions for ignition of said filamentary material by said primer material.
7 more elements
Dependencies are inferred from the claim text.