公开(公告)号：US06437698B1

公开(公告)日：2002-08-20

申请号：US09705745

申请日：2000-11-06

申请人： Michael Byrne ,  James Duignan ,  Keith Fawcett ,  Fergus Flynn ,  Michael Guinee

发明人： Michael Byrne ,  James Duignan ,  Keith Fawcett ,  Fergus Flynn ,  Michael Guinee

IPC分类号： G08B1710

CPC分类号： G08B3/10 ,  G08B1/08 ,  G08B17/107 ,  G08B17/113 ,  G08B29/043 ,  G08B29/145 ,  G08B29/24 ,  G08B29/26

摘要： A smoke alarm device has an ASIC (1) with an integrated photo detector (3) and control circuit. The photo detector output is compared every ten seconds with an alarm threshold level in a comparator circuit (10), with a sensitivity-decrease threshold in a comparator circuit (11), and with a sensitivity-increase threshold in a comparator circuit (12). A logic block (2) causes sensitivity to be increased or decreased in which decreases take place at intervals of six hours and increases take place after 40 secs. The logic block (2) provides for least sensitivity at power-up with rapid increases to the appropriate level according to the level of back-scatter caused by dust contamination. The logic block (2) maintains a high signal on an interconnect terminal (9) for four seconds after a test button (7) is pressed so that a maintenance person can hear remote interconnected devices after the local device has stopped sounding. The logic block (2) also stores a memory flag when is goes into alarm mode and modulates the horn at a different frequency at the next testing to indicate that it has historically sensed smoke since last tested.

摘要翻译： 烟雾报警装置具有集成光电检测器（3）和控制电路的ASIC（1）。 在比较器电路（10）中每十秒将光检测器输出与报警阈值电平进行比较，在比较器电路（11）中具有灵敏度降低阈值，并且在比较器电路（12）中具有灵敏度增加阈值， 。 逻辑块（2）使灵敏度增加或减少，其中减少以六小时的间隔进行，并且在40秒之后发生增加。 逻辑块（2）在上电时提供最小的灵敏度，根据灰尘污染导致的反向散射水平迅速增加到适当的水平。 逻辑块（2）在按下测试按钮（7）之后在互连终端（9）上保持高信号四秒钟，使得维护人员可以在本地设备停止发声之后听到远程互连设备。 当进入报警模式时，逻辑块（2）还存储存储器标志，并且在下一次测试时以不同的频率调制喇叭，以指示自从上次测试以来它已历史上感测到烟雾。

公开(公告)号：US4881063A

公开(公告)日：1989-11-14

申请号：US302913

申请日：1989-01-30

申请人： Keith Fawcett

发明人： Keith Fawcett

IPC分类号： G08B21/20

CPC分类号： G08B21/185

摘要： The present invention relates to a battery removal indicator for battery operated units such as smoke detectors or fire alarms. The battery removal indicator is formed by a spring loaded member which is retained in a retracted position when a battery is present and which moves to a deployed position when the battery is absent. In its deployed position, the member prevents a cover of the unit from being engaged by a latch mechanism for securing the cover in a closed position. The unlatched cover acts as a first visual indication that the battery is not present. The member is also marked with warning indicia on one or more surfaces so as to provide a second visual indication that the battery is absent.

摘要翻译： 本发明涉及一种用于电池供电单元的电池去除指示器，例如烟雾探测器或火警。 电池拆卸指示器由弹簧加载构件形成，当存在电池时，弹簧加载构件保持在缩回位置，并且当电池不存在时移动到展开位置。 在其展开位置，构件防止单元的盖与用于将盖固定在关闭位置的闩锁机构接合。 未锁定的盖子作为电池不存在的第一个视觉指示。 该成员还在一个或多个表面上标记有警告标记，以便提供电池不存在的第二视觉指示。