Torch with a rotationally symmetrical optical attachment

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 diameter of the reflector part is 20.8 mm±1 mm,
• the diameter of the converging lens part is 11.4 mm±1 mm,
• the axial length of the auxiliary optical system is 11.6 mm±1 mm,
• the thickness of the converging lens part is 3.04 mm±0.5 mm, and
• in the focused setting, the distance between LED and contact surface is 3.58 mm±0.5 mm and the distance between LED and a center point plane is 8.88 mm±1 mm.

A flashlight comprising:

• a housing;
• a holder disk fixed in the housing and forming a rear stop;
• a light-emitting diode mounted on the holder disk, directed forward along an axis, and having an outer reflector and an inner converging lens;
• a rotation-symmetrical auxiliary optical system axially displaceable in the housing forward of the holder disk and having an outer reflector part, an inner converging lens part, and a rear surface having a blind bore, a ratio between a diameter of the reflector part and a diameter of the converging lens part being 0.55±0.1 and a ratio between a thickness of the converging lens part and a length of the reflector part being 0.17±0.05;
• and
• a front stop on the housing limiting with the rear stop on the holder disk axial movement of the optical system between respective front and rear settings such that a substantially homogeneous light cone is generated in the rear setting on contact of the auxiliary optical system with the rear stop of the holder disk.