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    • 4. 发明授权
    • Credential reader having a micro power proximity detector and method of operating the credential reader
    • 凭证阅读器具有微功率接近检测器和操作凭证阅读器的方法
    • US08167203B2
    • 2012-05-01
    • US11958995
    • 2007-12-18
    • Steven George HemmerCharles Russell Eurich
    • Steven George HemmerCharles Russell Eurich
    • G06K7/00
    • G06K7/0008G06K7/10207
    • An improved battery-powered credential reader, which may be used in security and other applications, includes include a micro-power proximity detector. The micro-power proximity detector is configured to lengthen battery life by reducing power consumption requirements of the credential reader during periods when no credential is present. An antenna formed about a perimeter of a printed circuit board is configured to propagate an electrostatic sense field adjacent to and through the credential reader using only microamps of electrical current. A control circuit of the micro-power proximity detector is configured to activate the credential reader from a “sleep” state when a disturbance in the electrostatic sense field caused by a credential is detected and/or registered.
    • 可用于安全和其他应用的改进的电池供电凭证阅读器包括微功率接近检测器。 微功率接近检测器被配置为通过在没有凭证存在期间减少凭证读取器的功耗要求来延长电池寿命。 围绕印刷电路板的周边形成的天线被配置为仅使用微电流来传播与凭证读取器相邻并且通过凭证阅读器的静电感测场。 微功率接近检测器的控制电路被配置为当由凭证引起的静电感测场中的干扰被检测和/或登记时,从“睡眠”状态激活认证阅读器。