Method and apparatus for an L.E.D. flashlight

  • US 6,095,661 A
  • Filed: 03/19/1998
  • Issued: 08/01/2000
  • Est. Priority Date: 03/19/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A flashlight, comprising:

  • (a) a flashlight housing, the housing being suitable for at least one of receiving therein and mounting thereon at least one DC voltage source;

    (b) a light-emitting diode (LED) housing connected to the flashlight housing, the LED housing comprising a first plurality of LED units that each emit light and have a reflector for collimating the emitted light forwardly therefrom generally along an optical axis of one of the plurality of LED units, the first plurality of LED units including at least seven individual LED units; and

    (c) a first electrical circuit that selectively applies pulsed power from the DC voltage source to the LED units, wherein the pulses have a frequency high enough that light produced by the LED units has an appearance to a human user of being continuous rather than pulsed, and the pulses have at least one characteristic that is controlled by the first electrical circuit in order to maintain an average predetermined light output level of the LED units as a voltage on the DC voltage source varies;

    wherein the flashlight is of such compact size and low weight as to be suitable for single-handed portable operation by a user, the flashlight further having a purpose of providing general-purpose illumination.

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