US Patent 10520166 Flashlight unit

A flashlight unit includes a housing having an opening including a lens and a light source located in the housing for emitting light through the lens in a lighting direction. The light source is movable in the lighting direction, relative to the lens, for adjusting light emission. The flashlight unit has an adjusting mechanism including a rotatable member for adjusting the position of the light source in the lighting direction, relative to the lens. There is also a limiter for limiting rotational movement of the rotatable member when the light source reaches a predetermined position.