| 摘要 |
A compact smoke alarm assembly ( 10 ) is disclosed. The assembly ( 10 ) comprises: a smoke detection chamber ( 20 ) defined by a body ( 22 ) having a plurality of openings for allowing airflow therethrough, the body ( 22 ) having a sound inlet aperture ( 25 ); a smoke detector ( 30 ) mounted to the body for communication within the chamber ( 20 ); an electrical circuit operatively connected to the smoke detector ( 30 ), the circuit providing an electrical signal when the smoke detector ( 30 ) detects smoke in the chamber ( 20 ); and a piezoelectric disc ( 40 ) mounted external to the chamber adjacent to the sound inlet aperture, the piezo disc ( 40 ) operable in response to the electrical signal to generate sound. The smoke detection chamber ( 20 ) is sized substantially in accordance to the Helmholtz formula to cause resonance at the operating frequency of the piezo disc ( 40 ).
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