Piezoelectric vibrational and acoustic alert for a personal communication device
    4.
    发明授权
    Piezoelectric vibrational and acoustic alert for a personal communication device 失效
    用于个人通信设备的压电振动和声学警报

    公开(公告)号:US06259188B1

    公开(公告)日:2001-07-10

    申请号:US09386682

    申请日:1999-08-31

    IPC分类号: H01L41053

    CPC分类号: G08B6/00

    摘要: An alert apparatus for a personal communication device includes a mechanically prestressed piezoelectric wafer positioned within the personal communication device and an alternating voltage input line coupled at two points of the wafer where polarity is recognized. The alert apparatus also includes a variable frequency device coupled to the alternating voltage input line, operative to switch the alternating voltage on the alternating voltage input line at least between an alternating voltage having a first frequency and an alternating voltage having a second frequency. The first frequency is preferably sufficiently high so as to cause the wafer to vibrate at a resulting frequency that produces a sound perceptible by a human ear, and the second frequency is preferably sufficiently low so as to cause the wafer to vibrate at a resulting frequency that produces a vibration readily felt by a holder of the personal communication device.

    摘要翻译: 用于个人通信设备的警报装置包括位于个人通信设备内的机械预应力的压电晶片和耦合在晶片的两个位置的交流电压输入线,其极性被识别。 警报装置还包括耦合到交流电压输入线的可变频率装置,用于至少在具有第一频率的交流电压和具有第二频率的交流电压之间切换交流电压输入线路上的交流电压。 优选地,第一频率足够高以使得晶片以产生人耳可感知的声音的最终频率振动,并且第二频率优选地足够低,以致晶片以所得频率振动 产生由个人通信设备的保持器容易感觉到的振动。