Photoflash unit with circuit board radiation switches for select

Details Photoflash unit with circuit board radiation switches for select Photoflash unit with circuit board radiation switches for select

1980-12-18

1983-02-01

Walsh, Donald P.

Illumination

Photographic lighting

Plural light sources or light source supports

362 11, 362 13, G03B 1502

Patent

active

043719147

ABSTRACT:
A photoflash unit comprising a plurality of 2n flashlamps attached to a printed circuit board and disposed in a linear array with the longitudinal axes of respective lamps aligned in parallel. Circuit patterns on the circuit board include a plurality of n selective terminal means, each associated with a respective pair of the lamps and connected to one lead-in wire of each of the lamps of the associated pair, and a common terminal associated with all of the 2n lamps but directly connected to the other lead-in wire of one lamp of each pair. The circuit board has a substantially rectangular portion with n spaced apart extensions projecting vertically from a longer side thereof, the extensions being located behind alternate lamps of the linear array. Each extension contains portions of the circuit patterns spaced apart to form predetermined gaps, and a mass of switch material is disposed on each extension to bridge the gap between circuit patterns to thereby provide a solid state radiation switch on each extension behind and adjacent to a respective lamp for receiving radiant energy emitted by that lamp. In this manner, a respective normally open switch on each circuit board extension is coupled between the common terminal and a lead-in wire of the other lamp of each pair of lamps, so that the n normally open switches are coupled between the common circuit lead-in wire of associated pairs of the 2n lamps.

REFERENCES:
patent: 4136377 (1979-01-01), Fohl
patent: 4320440 (1982-03-01), Brower

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