| 摘要 |
A detector for detecting smoke or fire conditions, comprises optical detection apparatus including an optical sensor (fig. 1) and circuitry (64) for sensing activation of the optical sensor, ionization detection apparatus (fig. 2) including an ionization sensor and circuitry (66) for sensing activation of the ionization sensor, alarm generating means, and means (68-74 etc.) for coupling both the optical and ionization detection circuitry to the alarm generating means, said alarm generating means including means (84) responsive to at least one of the ionization and optical detection circuitry for establishing an alarm condition. <IMAGE> |
