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    • 2. 发明授权
    • Audio transducers
    • 音频换能器
    • US06785393B2
    • 2004-08-31
    • US09727221
    • 2000-11-30
    • Markku LipponenErkki NokkonenJanne Haavisto
    • Markku LipponenErkki NokkonenJanne Haavisto
    • H04R2500
    • H04R7/08H04R19/00H04R2499/15
    • A device (MS) having an electrical display (DSPL) is equipped with a transparent electrostatic diaphragm (ACT) vibrateably attached in front of the display. The display has been made electrically conductive and used as a stator of thus formed electrostatic speaker (TD1). A fluctuating DC-voltage is conducted to the diaphragm and display in order to resonate the diaphragm and produce sound respective to the fluctuation. The transparency of the diaphragm allows a user to see the display through the diaphragm. Alternatively, the similar arrangement can be used to implement a transparent electrostatic microphone on the display.
    • 具有电显示器(DSPL)的装置(MS)配备有可振动地附接在显示器前面的透明静电膜(ACT)。 显示器已经导电并用作这样形成的静电扬声器(TD1)的定子。 将波动的直流电压传导到隔膜并进行显示,以使隔膜共振并产生相应的波动的声音。 隔膜的透明度允许用户通过隔膜观察显示。 或者,类似的布置可以用于在显示器上实现透明静电麦克风。
    • 4. 发明授权
    • Illuminating electronic device and illumination method
    • 照明电子设备和照明方法
    • US06320330B1
    • 2001-11-20
    • US09489519
    • 2000-01-21
    • Janne HaavistoKaisa RikkinenMika Rintala
    • Janne HaavistoKaisa RikkinenMika Rintala
    • G05F100
    • H05B33/0818Y02B20/346
    • A display and keyboard illumination of battery-operated portable electronic devices using LEDs are provided. A flyback converter is modified into a dedicated converter suitable for using two LEDs and their diode-like operation is utilized. Firstly, a specified amount of energy of the battery voltage (Vbatt) is stored in the coil (L) of a primary circuit until, controlled by a comparator (K). The LEDs are connected in parallel with the coil, in direction such that they substantially prevent the current leaking through them. Secondly, the coil is disconnected from the battery by a switch (SW). A comparator (K) detects when the coil current reaches a specified threshold level and, by using a control circuit (SWC), then causes the switch (SW) to become non-conductive. The self-induction of the coil builds up a voltage exceeding the forward bias of the LEDs, which (thirdly) keeps on passing the current and illuminating. Fourthly, the control circuit (SWC) receives a rising edge of a switching frequency signal and causes the switch (SW) to become conductive again. Thus, the supply power of the LEDs is substantially independent of variations in battery voltage and the illumination is substantially stable.
    • 提供了使用LED的电池供电便携式电子设备的显示和键盘照明。 反激转换器被修改为适合于使用两个LED的专用转换器,并且利用其二极管状操作。 首先,将电池电压(Vbatt)的指定量的能量存储在初级电路的线圈(L)中,直到由比较器(K)控制。 LED与线圈并联连接,方向使得它们基本上防止电流泄漏通过它们。 其次,线圈通过开关(SW)与电池断开连接。 比较器(K)检测线圈电流何时达到规定的阈值电平,并通过使用控制电路(SWC),使开关(SW)变为不导通。 线圈的自感应产生超过LED的正向偏压的电压,其中(第三)保持通过电流并照亮。 第四,控制电路(SWC)接收开关频率信号的上升沿,并使开关(SW)再次导通。 因此,LED的供电功率基本上与电池电压的变化无关,并且照明基本上是稳定的。