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A triggerable ceramic gas tube voltage breakdown device, particularly adapted for use in an electrical circuit for controlling the light output of a photoflash lamp, includes means for reducing the attenuation of an electrical trigger pulse in the region of the electrode gap due to the ceramic space

A triggerable ceramic gas tube voltage breakdown device, particularly adapted for use in an electrical circuit for controlling the light output of a photoflash lamp, includes means for reducing the attenuation of an electrical trigger pulse in the region of the electrode gap due to the ceramic spacer tube. The electric field intensity in the region of the electrode gap resulting from the trigger pulse may be enhanced by disposing annular conductive material in the region and by connecting that material to a source of the trigger pulses. Alternatively or in conjunction therewith, the configuration of the ceramic spacer tube may be altered by removing material from the ceramic spacer tube in the region of the electrode gap, thereby enhancing the electric field intensity in that region resulting from the trigger pulses.

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A hermetically sealed triggerable gas tube voltage breakdown device comprising a first gap electrode, a second gap electrode, said first and second gap electrodes being the only gap electrodes in said device, an electrode gap formed between said gap electrodes, said electrode gap being the only elec

A hermetically sealed triggerable gas tube voltage breakdown device comprising a first gap electrode, a second gap electrode, said first and second gap electrodes being the only gap electrodes in said device, an electrode gap formed between said gap electrodes, said electrode gap being the only electrode gap in said device, an elongated ceramic insulating spacer disposed between said gap electrodes and enclosing said electrode gap, and trigger electrode means, physically separated from the electrically insulated from both of said gap electrodes and adapted to receive a trigger voltage signal other than the voltage applied across said gap electrodes, for increasing the electrical field intensity in the region of said electrode gap in response to said trigger voltage signal, said trigger electrode means being entirely exteriorly disposed about the outer periphery of said insulating spacer and being axially aligned along the length of said insulating spacer with said region of said electrode gap and being electrically insulated from said electrode gap by said insulating spacer, said spacer including means disposed about the region of said electrode gap for enabling the electric field intensity in said region to be increased in response to the application of said trigger voltage signal to said trigger electrode, said enabling means comprising a thin wall portion of said insulating spacer disposed at least partially about the region of said electrode gap, said thin wall portion having a wall thickness in the range of from about 0.015 inch to about 0.030 inch.