Miniature photoflash lamp and method of making
AssigneeGTE Products Corporation
InventorAndre C. Bouchard
Life of this patent
Estimating the term…
Abstract
A miniature photoflash lamp which includes a plastic, light-transmitting envelope and a quantity of a flash-producing composition therein. The composition includes a powdered metal (e.g., zirconium) and a powdered oxidizer (e.g., potassium chlorate) with the powdered metal having a particle size within the range of about 10 to 150 microns. Activation of the lamp may be accomplished electrically using, for example, a pair of conductive lead-in wires sealed within one end of the envelope. A method for making this lamp is also described.
Claims12
An electrically activated, miniature photoflash lamp comprising:
- a light-transmitting envelope having an internal volume equal to or less than about one cubic centimeter;
- a flash-producing composition located within said envelopefor burning in a substantially localized manner to provide a flash of light upon ignition thereof, said composition including a predetermined quantity of a powdered metal material and a predetermined quantity of a powdered oxidizer material, said powdered metal material having a particle size within the range of from about 10 to about 150 microns;
- and
- means for electrically igniting said flash-producing composition, said means extending within said envelope and in contact with said flash-producing composition and comprising a pair of conductive lead-in wires each having an insulative coating thereon and an exposed conductive end portion extending within said envelope, said lead-in wires twisted about each other and secured within a wall or end portion of said envelope.
A method of making a miniature, electrically-activated photoflash lamp, said method comprising:
- providing a tubular, light-transmitting member having first and second open ends;
- positioning a pair of conductive lead-in wires each having an insulative coating thereon and twisted about each other within said first of said open ends and sealing said first open end with said twisted wires therein such that an end portion of each of said wires extends within said tubular member;
- positioning a quantity of flash-producing composition within said second open end of said tubular member and in contact with said extending end of said lead-in wires, said composition including a predetermined quantity of a powdered metal material and a powdered oxidizer material for burning in a substantially localized manner to provide a flash of light upon ignition thereof, said powdered metal material having a particle size within the range of about 10 microns to about 150 microns;
- and
- sealing said second open end of said tubular member to define a light-transmitting envelope, said envelope having an internal volume equal to or less than abut one cubic centimeter.
Dependencies are inferred from the claim text.