Light emitting diode-illuminating device for use with e.g. flashlight, has convex lens moved relative to diode, where distance variation of diode relative to lens lies within dual focal length of lens and within preset range

摘要

The device has a power supply device provided inside a main body (1), and a light emitting diode (LED) (21) electrically connected with the power supply device and fixed in the interior of a front part of the body. A convex lens (5) is arranged in front of the LED and moved relative to the LED. The distance variation of the LED relative to the lens lies within a dual focal length of the lens and within the range of 0-32 millimeters.