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    • 5. 发明申请
    • Apparatus and method for laser scanner cleaning and protection
    • 用于激光扫描仪清洁和保护的装置和方法
    • US20060068696A1
    • 2006-03-30
    • US10942347
    • 2004-09-16
    • James AshfordJoseph Lazzara
    • James AshfordJoseph Lazzara
    • F24F9/00
    • G08B29/22G08B13/18
    • An air guard directs air toward a viewing window of an optoelectronic presence sensing device to reduce surface contamination thereon. The air guard may include a control valve, and possibly control circuits, to enable selective activation of the air guard. In one embodiment, the air guard includes one or more slits configured to vent pressurized air in a generally laminar (curtain like) flow in front of the window to prevent the deposition of airborne contaminants thereon. Alternatively, or additionally, the air guard may include one or more nozzles configured to vent pressurized air in directed air streams toward the window to remove surface contaminants thereon, and may include a control valve enabling selective operation in preventive, cleaning, or standby modes. Mode control may be effected by an external control system, by the presence sensing device, or by the air guard itself, which may include a timer or other control circuit.
    • 空气保护罩将空气朝向光电存在感测装置的观察窗口引导,以减少其上的表面污染。 防风罩可以包括控制阀,并且可能包括控制电路,以使得能够选择性地启动防风罩。 在一个实施例中,空气防护罩包括一个或多个狭缝,其构造成在窗口前面大致层流(帘状)流动中排出加压空气,以防止其上悬浮的污染物沉积。 替代地或附加地,空气防护件可以包括一个或多个喷嘴,其被配置为将定向空气流中的加压空气朝向窗口排出以除去其上的表面污染物,并且可以包括能够在预防,清洁或待机模式中进行选择性操作的控制阀。 模式控制可以由外部控制系统,存在感测装置或可能包括计时器或其它控制电路的空气防护装置本身来实现。