Photoflash lamp having non-shorting construction

Claim 2

A photoflash lamp of the type having a bulb, a pair of inleads extending inside said bulb in substantially mutually parallel spaced apart relationship with each other, and flash ignition means connected between said inleads within said bulb, said bulb containing combustible material ignitable by said flash ignition means, wherein the improvement comprises insulating means arranged between said inleads and along and adjacent to at least part of the length of one of said inleads so that, upon flashing of the lamp and burning back of the inleads, there will be a longer electrical path between the burned-back inleads than would be the case without said insulating means.

Claim 3

A lamp as claimed in claim 1 in which said combustible material comprises a loose mass of metal in filamentary form, and in which said bulb contains a combustion-supporting gas.

Claim 4

A lamp as claimed in claim 1 in which said flash ignition means is positioned substantially laterally across said inleads, and in which said insulating means comprises a sleeve positioned around and along a portion of said one inlead.

Claim 5

A lamp as claimed in claim 3 including inlead support means of vitreous material surrounding and holding said inleads at a position spaced from said flash ignition means, said sleeve on said one inlead extending from the surface of said inlead support means to a point near said flash ignition means.

Claim 6

A lamp as claimed in claim 4 including means for holding said sleeve by said inlead support means.

Claim 7

A lamp as claimed in claim 5 in which said sleeve is bonded to said inlead support means.

Claim 8

A lamp as claimed in claim 6 in which said inlead support means comprises a bead positioned within said bulb.

Claim 9

A photoflash lamp of the type having a bulb, a pair of inleads extending inside said bulb in substantially mutually parallel spaced apart relationship with each other, and flash ignition means connected across said inleads within said bulb, said bulb containing a loose mass of filamentary combustible metal and a combustion-supporting gas, wherein the improvement comprises a sleeve of insulating material positioned around and along at least a portion of the length of a first one of said inleads between its point of entry into the bulb and said flash ignition means so that the second inlead is more greatly exposed to the heat of flash combustion for a greater distance from said flash ignition means than is said first inlead, so that when the lamp is flashed said second inlead burns back farther than does said first inlead, thereby causing an offset, relatively long electrical path between the exposed parts of the burned-back inleads thus reducing the likelihood of a conductive path occurring thereacRoss.

Claim 10

A photoflash lamp of the type having a bulb, a pair of inleads extending inside said bulb in substantially mutually parallel spaced apart relationship with each other, and flash ignition means connected across said inleads within said bulb, said bulb containing a loose mass of filamentary combustible metal and a combustion-supporting gas, wherein the improvement comprises a sleeve of insulating material positioned around and along at least a portion of the length of a first one of said inleads between its point of entry into the bulb and said flash ignition means so that the second inlead is more greatly exposed to the heat of flash combustion for a greater distance from said flash ignition means than is said first inlead, so that when the lamp is flashed said second inlead burns back farther than does said first inlead, thereby causing an offset, relatively long electrical path between the exposed parts of the burned-back inleads thus reducing the likelihood of a conductive path occurring thereacRoss.

Claim 11

A lamp as claimed in claim 8 in which said flash ignition means is positioned substantially laterally across said inleads.

Claim 12

A lamp as claimed in claim 9 including a bead of vitreous material positioned within said bulb and surrounding and holding said inleads at a position spaced from said flash ignition means, said sleeve extending from the surface of said bead to a point near said flash ignition means.

Claim 13

A lamp as claimed in claim 10 including means for holding said sleeve by said bead.

Claim 14

A lamp as claimed in claim 11 in which said sleeve is bonded to said bead.