Patent ID: 8770783
Filing Date: 2014-07-08
Classification: F21L,F21V,F21Y

Abstract:
1. In a flashlight having an auxiliary optical system that is rotation symmetrical to an optical axis, and that has an outer reflector part, an inner converging lens part, and a rear surface having a blind bore, a holder disk forming a rear stop, and a light-emitting diode mounted on the holder disk, the improvement wherein the auxiliary optical system is displaceable relative to the LED through a stroke between moon and focused end settings delimited by a front stop in the housing and the rear stop of the holder disk in such a manner that a substantially homogeneous light cone is generated in the focused end setting on contact of the auxiliary optical system with the rear stop of the holder disk; the ratio between the diameter of the reflector part and the diameter of the converging lens part is 0.55±0.1; and the ratio between the thickness of the converging lens part and the axial length of the reflector part is 0.17±0.05.