Arrangement provided with some combustion flash bulbs

Claim 2

A flash bulb assembly for cooperation with an associated camera providing sequential flashes, said assembly comprising a plurality of flash bulbs means connecting said flash bulbs in series each of said bulbs having a heating wire, two lead-through conductors connected to said ignition wire, and means for reducing the resistance between said lead-through conductors upon ignition of said bulb, one of said bulbs having a first resistance before ignition and a second resistance after ignition, a second of said bulbs having a third resistance before ignition and a fourth resistance after ignition, said third resistance being smaller than said first resistance.

Claim 3

The apparatus as described in claim 1 further including a third bulb, said third bulb having an ignition wire having a fifth resistance before ignition and sixth resistance after ignition, said fifth resistance being a less than said third resistance.

Claim 4

The apparatus as described in claim 2 further including additional bulbs each having ignition wires having successively smaller resistances before firing than said other resistances.

Claim 5

The apparatus as described in claim 3 wherein said third resistance is not more than 60% of said first resistance, said fifth resistance is not more than 60% of said third resistance and each additional bulb has a resistance before ignition which is not more than 60% of every other resistance before ignition.

Claim 6

The apparatus as described in claim 4 wherein a resistance of each of said ignition wires before ignition is less than 1 ohm after ignition.

Claim 7

The apparatus as described in claim 4 wherein all said resistances are measured at room temperature.

Claim 8

The apparatus as described in claim 4 further including meAns for ignitin said bulbs, said means including a supply capacitor chargeable from an associated power supply, said capacitor having a capacitance sufficiently low so that the residual charge in said supply capacitor after flashing of one of said bulbs corresponds to a quantity of energy which after multiplication by the factor (Rh/Rt) is smaller than the energy required at that moment to ignite the remaining unflashed bulb having the highest resistance in said assembly, Rh being the resistive value of the unflashed lamp having the highest resistance in the assembly and Rt is the total resistive value of the discharge circuit of the supply capacitor.

Claim 9

The apparatus as described in claim 4 wherein the material of the heating wire of each of said bulbs is different from every other bulb in the assembly.

Claim 10

The apparatus as described in claim 4 wherein four bulbs are provided in said assembly and the material of the heating wires are kanthal, chromel, alumel and molybdenum.

Claim 11

The apparatus as described in claim 4 wherein said means for changing said resistance comprises an electrically conducting bushing which surrounds said supply conductors of the heating wire within said bulb, said bushing melting upon ignition of said bulb to complete a circuit between said lead-through conductors.