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公开(公告)号：US3721515A
公开(公告)日：1973-03-20
申请号：US3721515D
申请日：1971-11-02
Applicant: PHILIPS CORP
Inventor： VAN DER TAS J , MEULEMANS C , BOEKKOOI A , HURX A
CPC classification number: F21K5/02
Abstract: A combustion flash bulb ignited by means of a piezo-electric ignition in which, to protect the wall of the envelope, a separate tubular inner envelope is arranged in the envelope, said inner envelope being open at its end facing the lamp base and comprising the metal wool to be burned. In order to attenuate the shock wave occurring during the combustion in the inner envelope, said inner envelope comprises opposite to the open tube end a narrowed end in which an aperture is provided. The inner envelope is thin-walled and manufactured from a soft glass.
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