The patent's inventor is Opolka, Rainer (Solingen, DE).
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "Flashlights of the type mentioned at the beginning having the described auxiliary optical systems are known in principle according to the prior art. For example, various auxiliary optical systems are described in U.S. Pat. No. 2,254,962, wherein a light source is displaceable within the rear blind bore to change the emission characteristic. The light source is longitudinally axially movable between two points that are both arranged inside the blind bore. The aperture angle of a light cone is essentially changed by a linear movement of the light source, so that objects can be illuminated at different spacings.
"The known flashlights having the described auxiliary optical systems have the disadvantage that the light intensity within the light cone is not uniform, wherein the intensity is typically greatest on the optical axis, while it decreases continuously toward the edge of the light cone."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "This object is achieved by the flashlight according to invention in which the auxiliary optical system is displaceable relative to the LED delimited by two stops in such a manner that a substantially homogeneous light cone is generated in the case of contact of the auxiliary optical system on the holder disk.
"The emission characteristic of the flashlight according to the invention is essentially defined by two settings, namely a focus setting, in which the LED has the greatest possible spacing to the auxiliary optical system, and the moon setting, in which the auxiliary optical system is in contact with the holder disk, so that the LED comes to rest nearly at the height of the rear surface. In the focus setting, the emitted light is bounded to a relatively small light cone, so that objects at a greater spacing can be illuminated. In the moon setting, in contrast, a light cone having the largest possible angle is generated, wherein the light distribution in the flashlight according to the invention is uniform within the light cone and drops off sharply toward the edge. A particularly homogeneous illumination is thus provided. Through the design according to the invention, the preferred setting of the flashlight can be rapidly selected without cumbersomely searching for the correct spacing between the auxiliary optical system and the LED. According to a first embodiment, it is provided that the linear movement of the auxiliary optical system along the optical axis is delimited by a further stop that forms the greatest possible spacing between the LED and the auxiliary optical system, wherein the LED lies in the focal point of the auxiliary optical system in this setting. Depending on the design of the flashlight, this stop is formed by a stop surface in each case on the flashlight housing and the lamp head or within a connection element. The moon setting, in which the light is emitted homogeneously within a defined light cone, is then set optimally if the holder disk is in contact with the stop surface of the auxiliary optical system and accordingly the LED nearly coincides with the stop surface plane.
"To dissipate the occurring heat, it is preferably provided that the holder disk has heat-conductive surfaces that are in contact with the housing. For example, a ring-shaped contact surface can be provided on the lower side of the holder disk for this purpose, with which it presses against a pedestal-shaped projection within the housing. In particular aluminum, copper, or brass is suitable as a preferred material for the heat conductive surfaces.
"The particular emission characteristic of the flashlight according to the invention is substantially determined by the geometric design of the auxiliary optical system, wherein the length or size ratios are particularly significant in this regard. It is preferably provided in this regard that the ratio between the diameter of the reflector part and the diameter of the converging lens part is 0.55.+-.0.1, preferably 0.55.+-.0.05. In other words, the ratio between the diameter of the reflector part and the diameter of the converging lens part is 0.55, wherein deviations in the order of magnitude of 0.1, preferably 0.5 are tolerable, both in the positive direction and also in the negative direction. The ratio between the thickness of the converging lens part and the length of the reflector part is preferably 0.17.+-.0.05, preferably 0.17.+-.0.02.
"In the focused setting, the ratio between the spacing of the LED to the contact surface and the spacing of the LED to a center point plane is 0.4.+-.0.1, preferably 0.40.+-.0.05.
"Furthermore, it is preferably provided that the blind bore has a conical lateral surface that has an aperture angle of 23.degree..+-.5.degree., preferably 23.degree..+-.2.degree., relative to the longitudinal axis.
"According to a particularly preferred embodiment, various actual dimensions of the geometric parts are provided, wherein preferably the diameter of the reflector part is 20.8.+-.1 mm, the diameter of the converging lens part is 11.4.+-.1 mm, the length of the auxiliary optical system is 11.6.+-.1 mm, the thickness of the converging lens part is 3.04.+-.0.5 mm or in the focused setting the spacing between LED and contact surface is 3.58.+-.0.5 mm and the spacing between LED and a center point plane is 8.88.+-.1 mm.
"The converging lens part is preferably delimited by two surfaces having convex curves of different strengths, wherein the radius of the light entry surface is greater than the radius of the light exit surface."
For the URL and additional information on this patent, see: Opolka, Rainer. Torch with a Rotationally Symmetrical Optical Attachment. U.S. Patent Number 8770783, filed
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