G - Physics – 03 – B
Patent
G - Physics
03
B
240/76
G03B 15/03 (2006.01) G03B 15/04 (2006.01) H05K 1/00 (2006.01)
Patent
CA 1161811
D-22,494 PHOTOFLASH UNIT WITH CIRCUIT BOARD RADIATION SWITCHES FOR SELECTIVE PAIRING Of LAMPS ABSTRACT OF THE DISCLOSURE 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 rec- tangular portion with n spaced apart extensions projecting verti- cally 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.
392457
Armstrong Donald E.
Broadt David R.
Kackenmeister Carl F.
Gte Products Corporation
R. William Wray & Associates
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