SMOKE ALARM DEVICE Russian patent published in 2002 - IPC

FIELD: smoke indication devices with scattered light. SUBSTANCE: smoke alarm device has anchored insert with optical module comprising light source, light detector. measurement chamber, central blend, bottom and labyrinth system with blends placed over periphery of measurement chamber. Certain parts of optical module important for emergence of background light have glittering surface and are manufactured to reflect unabsorbed light in definite direction. These parts predominantly include peripheral blends, central blend and cover of measurement chamber opposite to bottom. Some other parts or entire internal side of optical module also can have glittering surface. EFFECT: improved protection against false operation of smoke alarm device. 2 cl, 2 dwg