公开(公告)号：US20030095406A1

公开(公告)日：2003-05-22

申请号：US10299609

申请日：2002-11-18

申请人： PPT Vision, Inc.

发明人： Gary A. Lebens ,  Charles T. Bourn ,  Charles A. Lemaire

IPC分类号： F21S009/00

CPC分类号： H04N5/2354 ,  F21L4/027 ,  F21Y2115/10 ,  H04B10/502 ,  H04B10/564 ,  H05B33/0803 ,  H05B33/0812 ,  H05B33/0818 ,  H05B33/0863 ,  H05B33/0869 ,  H05B33/089 ,  Y02B20/343 ,  Y02B20/346 ,  Y10S362/80 ,  Y10S362/802

摘要： Improved method and apparatus for hand-held portable illumination. A flashlight and corresponding method are described. The flashlight includes a housing, a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the flashlight is suitable for handheld portable operation by a user. In one embodiment, the first electrical circuit further includes a control circuit for maintaining a predetermined light output level of the LED units as a charge on a battery varies. In another embodiment, the control circuit maintains an average predetermined light output level of the LED units as the charge on the battery cell varies by changing a pulse width or frequency as the charge on the battery cell varies to maintain a given average light output. Another aspect provides an illumination source that includes a light-emitting diode (LED) housing including one or more LEDs, and a control circuit that selectively applies power from a source of electric power to the LEDs, the control circuit substantially maintaining a light output characteristic of the LEDs as a voltage of the voltage source varies over a range that would otherwise vary the light output characteristic. Still another aspect provides an illumination source including a light-emitting diode (LED) housing including one or more LEDs; and a control circuit that selectively applies power from a source of electric power to the LEDs, thus maintaining or controlling a light output color spectrum of the LEDs.

摘要翻译： 改进的手持便携式照明方法和装置。 描述手电筒和相应的方法。 手电筒包括壳体，多个LED以及选择性地将电力从DC电压源施加到LED单元的电路，其中手电筒适合于用户的手持式便携式操作。 在一个实施例中，第一电路还包括控制电路，用于当电池上的电荷变化时，保持LED单元的预定光输出电平。 在另一个实施例中，当电池单元上的电荷变化以维持给定的平均光输出时，随着电池单元上的电荷改变脉冲宽度或频率，控制电路维持LED单元的平均预定光输出电平。 另一方面提供了一种照明源，其包括包括一个或多个LED的发光二极管（LED）外壳，以及控制电路，其选择性地将来自电力源的功率施加到LED，所述控制电路基本上保持光输出特性 作为电压源的电压的LED在改变光输出特性的范围内变化。 另一方面提供了一种包括包括一个或多个LED的发光二极管（LED）壳体的照明源; 以及控制电路，其选择性地将来自电力源的功率施加到LED，从而维持或控制LED的光输出色谱。