A flashlight has a lens or lenses moveable relative to one or more LED or other light source. The beam of light provided by the LED can be focused and provides a uniform light pattern across the range of focus. The lenses are supported on a front housing section and the LED is supported on a back housing section threaded onto the front housing section. Twisting the front housing section closes a switch providing power to the LED, to turn the flashlight on. One or more circuit modules within the flashlight provides various operating modes including an automatic shut-off timer, to preserve battery life, a dimmer controlled by turning an end cap, a blinking function, and/or a current control function to provide maximum brightness regardless of battery condition.
This application is a Continuation-In-Part of U.S. patent application Ser. No. 10/644,392, filed Aug. 19, 2003, now pending, which is a Continuation-In-Part of U.S. patent application Ser. No. 10/397,766, filed Mar. 25, 2003, now pending. Priority to each of these applications is claimed under 35 U.S.C. .sctn. 120. These applications are also incorporated herein by reference.
A focus-adjustable LED flashlight includes: a tubular housing; an LED light-emitting unit coupled to the tubular housing; a sleeve unit coupled movably to the tubular housing; and a positive lens mounted in the sleeve unit and spaced apart from and aligned with the LED light-emitting unit along an axis of the tubular housing. The sleeve unit is movable relative to the tubular housing and the LED light-emitting unit along the axis of the tubular housing so as to adjust a distance between the positive lens and the LED light-emitting unit.
