spotlight

By employing strongly convexly contoured direct light entry and exit surfaces in radiators, the issue of undesirable imaging effects is addressed, resulting in a uniformly round light distribution and rotationally symmetrical color distribution with maintained high light efficiency.

DE102023130876A1Pending Publication Date: 2025-05-08BARTENBACH HLDG
View PDF 5 Cites 0 Cited by

Patent Information

Application Number
DE102023130876
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-11-08
Publication Date
2025-05-08

AI Technical Summary

Technical Problem

Existing radiators with collimator lenses suffer from undesirable imaging effects, resulting in rectangular light distribution contours and color temperature eccentricities in the target region, despite high light-technical efficiency.

Method used

The radiator features strongly convexly contoured direct light entry and exit surfaces, allowing light beams to crossover within the lens, thereby eliminating imaging effects and achieving a uniformly round light intensity contour and rotationally symmetrical color distribution.

Benefits of technology

This design effectively eliminates undesirable imaging effects, ensuring a uniformly round light distribution and rotationally symmetrical color distribution in the target region while maintaining high light efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 00000000_0000_ABST
    Figure 00000000_0000_ABST
Patent Text Reader

Abstract

The present invention comprises a spotlight with a light source and a lens for shaping a beam of light, wherein the lens has matched direct light entry and exit surfaces for capturing light from the light source and emitting an unreflected direct light beam, wherein said direct light entry and exit surfaces are each convexly contoured such that the light rays thrown from the direct light entry surface onto the direct light exit surface cross over inside the lens and are refocused and emitted from the direct light exit surface as a direct light beam.
Need to check novelty before this filing date? Find Prior Art

Description

[0001] The present invention relates to a spotlight with a light source and a lens for shaping a beam of light, wherein the lens has matched direct light entry and exit surfaces for capturing light from the light source and emitting an unreflected direct light beam.

[0002] Spotlights project a focused beam of light in one direction, with the beam showing no or only slight widening and regularly focused at infinity. In the case of so-called pinhole or panel spotlights, there can also be a constriction quite close to the optics, so that the spotlight can shine through a narrow hole, for example in a ceiling panel, which is smaller than the diameter of the optics, and the beam can widen again somewhat on the side of the panel facing away from the spotlight.

[0003] To generate such a focused beam of light rays with a narrow beam angle, collimating lenses are often used, most of which are designed as TIR optics, i.e., they operate with total internal reflection to shape the beam of light rays or a portion thereof. Such collimating lenses enable a narrow beam angle with high optical efficiency, regularly exceeding 80%.

[0004] The beam of light rays formed by such collimating lenses regularly comprises two different types of rays: on the one hand, the non-reflected direct light beam, and on the other hand, the reflected indirect light beam. The non-reflected direct light beam typically passes through the central part of the lens without significant deflection and is only deflected at the light-entry and light-emission surfaces. These surfaces are designed to ensure that the direct light beam exits the lens with a narrow angle of dispersion.

[0005] The indirect light beam is typically shaped by an outer ring section of the lens. In addition to the deflections of the light paths at the light entry and exit surfaces, reflection occurs at the lens's circumferential surface. This means that the light rays are usually thrown from the light entry surface onto the lens's circumferential surface, reflected there, and finally deflected again upon exiting through the exit surface. This reflection at the circumferential surface can be enhanced by a reflective coating. The light entry, circumferential, and exit surfaces responsible for the reflected indirect light are coordinated so that the indirect light beam is emitted from the exit surface with only a narrow or no widening angle. The direct and indirect light beams can overlap in the target area.

[0006] To create a tight focusing of the emitted light in this way, a smooth, highly transparent surface is required at least on the light-emitting side and ideally also on the incoming side to avoid scattering effects and undesirably wide beam angles. Facets are therefore only possible to a very limited degree.

[0007] One problem that arises from this is the undesirable imaging effects, particularly in the area of ​​non-reflected direct light. The direct light in the center of the lens causes imaging effects, specifically that rectangular light sources, such as LEDs or LED clusters, produce an undesirable, also rectangular, contouring of the light distribution in the target area, i.e., they are imaged there. While this is compensated to some extent by the superimposition of the more or less circular indirect light component, the rectangular deformation of the light beam nevertheless remains visible.

[0008] If a multi-colored light source group, for example in the form of a multi-colored LED cluster, is used as a light source, the imaging effect of such collimator lenses also leads to eccentric shifts in the color temperatures in the target area, since, for example, a red component positioned in the top left of the LED cluster shifts the red to the bottom right in the target area.

[0009] Radiator lenses of the aforementioned type are known in practice, for example, under the company or product names "LED Veronica", "Carclo Narrow" and Gaggione LLC 05 N".

[0010] The present invention is based on the objective of creating an improved emitter of the aforementioned type, which avoids the disadvantages of the prior art and advantageously develops the latter further. In particular, an emitter without undesirable imaging effects is to be created, with a uniformly round contouring of the luminous intensities in the target area and a uniformly rotationally symmetrical distribution of light colors, without sacrificing the high optical efficiency of known collimator lenses.

[0011] The aforementioned problem is solved according to the invention by a radiator according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.

[0012] It is therefore proposed to model the light entry and exit surfaces responsible for the non-reflected direct light beam with a high degree of plasticity in order to achieve a crossing of the light rays within the lens between these surfaces. Even though the paths of the direct light component do not undergo reflection, the beam paths cross inside the lens and are deflected so strongly by the highly convex contoured entry and exit surfaces that the overall imaging effect is destroyed or at least weakened.

[0013] According to the invention, the aforementioned direct light entry and exit surfaces are each contoured convexly such that the light rays thrown from the direct light entry surface onto the direct light exit surface cross over inside the lens and are again bundled and emitted as direct light beams from the direct light exit surface.

[0014] The aforementioned direct light entry and exit surfaces can, in particular, form more or less pointed cones projecting towards the light source on one side and towards the direction of emission on the other, or be conical or conical in shape overall, in order to create intersecting beam paths within the lens and a narrow direct light beam with little or no widening angle radiating from the light exit surface. A conical, pinecone-shaped, or conical direct light entry surface deflects the incoming light rays more strongly, allowing them to travel diagonally across the lens's central axis until they reach the similarly pinecone-shaped, conical, or conical light exit surface, from where they are deflected back to produce a beam of light rays that is at least approximately parallel.

[0015] The direct light entry and exit surfaces can be contoured and arranged in such a way that the direct light beam exhibits essentially no widening, for example, having a focal point at infinity. Depending on the specific lighting task, however, the direct light beam can also show a slight widening, for example, a widening angle of 2 × 5° or less. Alternatively or additionally, the direct light beam can also have a constriction relatively close to the lens, for example, to allow it to pass through a hole in a perforated panel, whereby such a constriction can have a diameter smaller than the lens.

[0016] To achieve sufficient elimination of the imaging effect while still maintaining tight focusing, the convex light-entry surface capturing the direct light can be relatively slender and tapered to a point, for example, forming at least an approximate cone with a cone angle in the range of 2 × 15° to 2 × 30°, such as 2 × 20° to 2 × 25°. However, the light-entry surface capturing the direct light need not be conically contoured in the mathematical sense, but can, for example, have a rounded tip, or be hyperbolically shaped like a sugarloaf when viewed in longitudinal section, or be more strongly curved at the tip and then progressively less curved towards the sides, or have an approximately straight contour when viewed in longitudinal section. Preferably, the aforementioned light-entry surface is harmonically curved or harmonically contoured, if necessary.with the exception of the apex, which can form a special point, as is the case with a cone apex.

[0017] If one considers the direct light entry surfaces as a whole—that is, the portion of the lens surface on the entry side, or the side facing the light source, that captures light from the light source and projects it directly onto the exit surface without total internal reflection—the convex cone shape can have a length-to-maximum-width or length-to-maximum-diameter ratio ranging from 2 / 3 to 4 / 3 or 3 / 4 to 5 / 4. The length refers to the extent of the cone-shaped body enclosed by the direct light entry surface, which actually captures light from the light source, in the main emission direction of the lens and / or parallel to an axis of symmetry or parallel to a longitudinal center axis of the lens. The width, orThe maximum diameter refers to the maximum extent of the body defined by the direct light entrance surface, perpendicular to its length, i.e., for example, perpendicular to the main emission direction or perpendicular to the longitudinal center axis of the lens. The maximum width or maximum diameter is preferably located on a section of the direct light entrance surface that is furthest away from the light source or closest to the light exit surface, thus capturing just enough light to be emitted from the lens as non-reflected direct light.

[0018] The direct light entry surface, viewed in a longitudinal section, can have a continuously increasing width or diameter in the direction of the main emission direction, as is the case, for example, with a cone or a sugarloaf.

[0019] The direct light emission surface can have a similar contour to the direct light incidence surface, in particular forming a cone with a cone angle in the range of, for example, 2 × 30° to 2 × 55° or 2 × 40° to 2 × 50°. However, the direct light emission surface does not necessarily have to be conically shaped in the mathematical sense, but can, for example, be rounded towards the apex or have a hyperbolic, flattening curvature when viewed in a longitudinal section, specifically in the direction from the light emission surface towards the light incidence surface.

[0020] The length / diameter ratio of the direct light emission surface or the convex body formed by it can be similar to that of the direct light entry surface, ranging from 2 / 3 to 4 / 3 or 3 / 4 to 5 / 4.

[0021] To achieve high optical efficiency and a clean, narrow beam focus, in an advantageous embodiment of the invention, the direct light entry surface and / or the direct light exit surface can be smooth and highly transparent, in particular without significant or any faceting and / or without frosting. Optionally, slight faceting on the exit surface and / or possibly also on the entry surface can be helpful, wherein such slight facets define a smooth surface whose curvature deviates slightly from the contour of an enveloping surface placed against the exit and / or entry surface. For example, slight faceting can have a slight scale-like structure with, for example, slightly convex scale-like shingles. As mentioned, however, it is also possible to work entirely without faceting and, in particular, entirely without frosting.

[0022] Preferably, the convex direct light entrance surface, as described above, can be positioned and contoured relative to the light source such that it captures a cone of light emanating from the light source with a cone angle of less than 2 × 40°, less than 2 × 30°, or, in particular, less than 2 × 20°. A relatively small cone angle of the direct light entrance surface, for example, 2 × 30° or 2 × 20°, can ensure sufficient crossing of the light rays inside the lens while simultaneously allowing for a tight focusing of the direct light beam emanating from the light exit surface, thus adequately eliminating unwanted imaging effects and ensuring tight focusing.

[0023] The broader, diffused light components that are no longer captured by the cone- or cone-shaped direct light entry surface, i.e., light rays passing to the sides, right and left, or behind and in front, can be captured by an outer part of the lens to be processed into reflected indirect light or, if necessary, to be blocked if photometric efficiency is not the primary concern.

[0024] In particular, the aforementioned direct light entry and exit surfaces can form a central part or section of the lens and be surrounded by indirect light entry and exit surfaces that form an annular outer lens part or section and are coordinated in such a way that they emit a similarly narrow indirect light beam with a small or even no widening angle. Such a narrow indirect light beam can be superimposed on the aforementioned direct light beam, especially if they coincide coaxially in the target area, whereby the direct light component and the indirect light component can each illuminate the entire area in the target area in a substantially congruent manner. This allows for a homogeneous, uniform mixing of the light in the target area. At the same time, high optical efficiency can be achieved.

[0025] The light-entry surfaces that shape or assist in shaping the direct and indirect light beams can together capture essentially all the light emitted by the light source. For example, the indirect light entry surface can form a cup-shaped ring surrounding the light source, such as an LED or an LED cluster. The direct light entry surface can extend from the bottom of the space enclosed by the cup-shaped indirect light entry surface towards the light source, preferably not projecting beyond the edge of the indirect light entry surface or being slightly recessed, so that the light source can be positioned far enough inside the ring-shaped indirect light entry surface.

[0026] The indirect light exit surface can have an annular contour, which may be flat or only slightly curved when viewed in a longitudinal section of the lens. At the inner edge of this annular indirect light exit surface, the lens may have a crack or a cup-shaped depression or recess, from the center of which the direct light exit surface can then protrude.

[0027] Alternatively, instead of such an additional, outer ring-shaped lens part, the lens can also consist only of the described lens body for generating the direct light beam, i.e., it can have the described direct light entry surface and direct light exit surface and an intermediate lens body, which can be essentially cylindrical, and may form part of a hybrid optic to optionally shape the portion of light passing by the direct light entry surface, which is emitted by the light source, into an additional indirect light beam by means of reflection.

[0028] In particular, such a hybrid optical element can have a reflector that can be contoured in a bowl shape and / or surround the lens. The portion of light passing the direct light entrance surface of the lens can be captured and reflected by the reflector, in particular shaped into an indirect light beam which can be emitted coaxially to the direct light beam and / or superimposed on the direct light beam in the target area, in particular congruently. For example, the indirect light beam shaped by the reflector and the direct light beam shaped by the lens can have coaxial principal axes and a focal point at infinity.

[0029] The invention is explained in more detail below with reference to a preferred embodiment and the accompanying drawings. The drawings show: Fig. 1: A perspective view of a lens of a light source according to an advantageous embodiment of the invention in a half-section, showing the conical or strongly convex contoured direct light entry and exit surfaces in the central section of the lens and the surrounding ring-shaped lens part operating with total internal reflection for forming a reflected indirect light beam, Fig. 2: a representation of the ray paths in the lens made of Fig. 1, wherein the central lens part shows the intersecting beam paths of the direct light beam and the outer annular lens part shows the beam paths for the indirect light beam produced by total internal reflection, Fig. 3: a representation of the light paths in the central part of the lens Fig. 1, which intersect inside the lens and form the unreflected direct light beam, wherein partial view a) shows an arrangement of the direct light entry surface with a collecting angle of 2 × 30° and partial view b) shows an arrangement of the direct light entry surface with a collecting angle of 2 × 20°, Fig. 4: A representation of a hybrid optic comprising a lens and a reflector surrounding the lens according to a further embodiment of the invention, wherein the beam paths through the lens for the unreflected direct light beam and the beam paths reflected at the reflector for the reflected indirect light beam are shown, and Fig. 5: a comparative representation of the color mixtures or light distributions produced on the one hand by a conventional collimator lens with undesirable imaging effects in the direct light beam and on the other hand by a lens according to Fig. 1 will be achieved.

[0030] How Fig. As shown in Figure 1, the emitter 1 comprises a lens 2, the light entry side of which is oriented towards a light source 3, for example in the form of an LED or an LED cluster, and which directly captures, preferably completely captures, the light emitted by the light source 3.

[0031] The lens 2 can have a cup-shaped light entrance recess facing the light source 3, which can be positioned over the light source 3. If the light source 2 is designed as a hemisphere radiator, the aforementioned cup-shaped light entrance recess captures all the light from the light source 3.

[0032] The aforementioned light entry recess comprises two types of light entry surfaces. Firstly, a direct light entry surface 4 is provided, which can be located in the central part of the cup-shaped light entry recess and can be positioned directly opposite the light source 3. This direct light entry surface 4 has a convex contour resembling a cone or a sugarloaf and can be positioned coaxially with the main axis of the light source 3.

[0033] Secondly, an indirect light entry surface 5 is provided, which surrounds the cup-shaped light entry chamber and can essentially form a circumferential wall of the cup-shaped recess, cf. Fig. 1. Since the aforementioned direct light entry surface 4 is convexly projecting, the indirect light entry surface 5 surrounds the aforementioned direct light entry surface 4.

[0034] The light captured by the direct light entry surface 4 exits the lens 2 at the direct light exit surface 7 without being reflected, wherein said direct light exit surface 7 can be substantially opposite the direct light entry surface 4 or arranged on the opposite side of the lens 2 and positioned coaxially to the direct light entry surface.

[0035] How Fig. As shown in Figure 1, the direct light exit surface 7 is also convexly contoured, in particular conically shaped or contoured in a manner similar to a sugarloaf or a pine cone, wherein the said direct light exit surface 7 projects in the direction of the light exit from the lens 2.

[0036] The aforementioned direct light entry and exit surfaces 4 and 7, as well as the intermediate part of the lens body, form a central part of the lens 2, which may be surrounded by a ring-shaped outer lens section that is responsible for the reflected indirect light or works with total internal reflection to shape the indirect light beam.

[0037] As from the Fig. 1 and Fig. As can be seen from 2, the indirect light entry surface 5 throws the captured light onto the circumferential side or surface 6 of the lens 2, where the light paths are then reflected and thrown onto the ring-shaped indirect light exit surface 8.

[0038] The indirect light emission surface 8 surrounds the direct light emission surface 7 in a ring shape, wherein, as Fig. Figure 1 shows that a step or height offset may be provided in the transition area between the indirect light emission surface 8 and the direct light emission surface 7, wherein a circumferential surface that realizes this height offset may be essentially cylindrical and parallel to the main axis of the lens 2.

[0039] How Fig. Figure 2 shows that the path of the indirect light, that is, the light captured by the indirect light entry surface 5, totally reflected by the circumferential surface 6, and emitted by the indirect light exit surface 8, is conventional and similar to that of a known collimator lens. The indirect light beam 9 can exit in a tightly focused beam and, for example, focus at infinity, although smaller angles of dispersion of, for example, 2 × 5° or less are also possible.

[0040] However, the path of the direct light beam in lens 2 differs significantly from previously used collimator lenses. Due to the strongly convex, slender, and pointed shape of the direct light entrance surface 4, the rays are deflected so strongly upon entering lens 2 that they cross inside the lens 2 before reaching the direct light exit surface 7 (see figure). Fig. 2. If one considers Fig. 2, the rays captured by the left part of the direct light entry surface 4 are thrown onto the right side of the direct light exit surface 7 and conversely, the rays captured by the right part of the direct light entry surface 4 are thrown onto the left side of the direct light exit surface 7.

[0041] The intersecting beam path inside lens 2 avoids the imaging effect of conventional collimator lenses and also results in a homogeneous color distribution in the target area, even when eccentric arrangements of individual colored LED elements are made on the light source 2.

[0042] The strongly convex, tapered or slender and strongly protruding contouring of the direct light exit surface 7 straightens the intersecting path of the direct light rays, so to speak, in order to focus the direct light beam 10 tightly or to emit it with no or only a small widening angle of, for example, less than 2 × 5°.

[0043] The indirect and direct light beams 9 and 10 can be emitted coaxially to each other and essentially completely overlap or be congruent to each other in the target area.

[0044] As the Fig. 1 and Fig. As shown in Figure 2, the convexly curved direct light entry surface 4, which captures the direct light, can be relatively slim and tapered, for example forming at least approximately a cone with a cone angle in the range of 2 × 15° to 2 × 30°, for example 2 × 20° to 2 × 25°. The light-entry surface 4 capturing the direct light does not have to be exactly conical in the mathematical sense, but can, for example, have a rounded tip, or be hyperbolically shaped like a sugarloaf when viewed in longitudinal section, or be more strongly curved at the tip and then less and less curved towards the sides, or have an approximately straight contour when viewed in longitudinal section, whereby such a sugarloaf or pine cone has a cone angle in the aforementioned range of 2 × 15° to 2 × 30° over the greater part of its length, for example 2 / 3 or 3 / 4 of its length or more.The angle of incidence can be 2 × 20° to 2 × 25° when tangents drawn to the slightly curved circumferential surface are considered. Preferably, the aforementioned light-entry surface 4 is harmonically curved or harmonically contoured, optionally with the exception of the apex, which can form a special point, as is the case with a cone apex.

[0045] If one considers the direct light entrance surface 4 as a whole, i.e., the part of the lens surface on the entrance side or the side facing the light source 3, which captures light coming from the light source 3 and projects it directly onto the light exit surface 7 without internal total internal reflection, the convex cone shape can have a length-to-maximum-width or length-to-maximum-diameter ratio that can be in the range of 2 / 3 to 4 / 3 or 3 / 4 to 5 / 4, cf. Fig. 1, Fig. 2 and Fig. 3. The length mentioned refers to the extension of the cone-shaped body, which is enclosed by the direct light entry surface 4 and actually captures light from the light source 3, in the main emission direction of the lens 2 and / or parallel to an axis of symmetry or parallel to a longitudinal central axis of the lens 2.

[0046] The direct light entry surface 4, viewed in a longitudinal section, can have a continuously increasing width or diameter in the direction of the main emission direction, as is the case, for example, with a cone or a sugarloaf, cf. Fig. 1, Fig. 2 and Fig. 3.

[0047] The direct light emission surface 7 can have a similar contour to the direct light entry surface 4, i.e., it can form a cone with a cone angle in the range of, for example, 2 × 30° to 2 × 55° or 2 × 40° to 2 × 50°. However, the direct light emission surface 7 does not necessarily have to be conically contoured in the mathematical sense, but can, for example, be rounded towards the apex or have a hyperbolically flattening curvature when viewed in a longitudinal section, specifically in a direction from the light emission surface towards the light entry surface.

[0048] The length / diameter ratio of the direct light emission surface 7 or of the convex body formed by it can be in the range of 2 / 3 to 4 / 3 or 3 / 4 to 5 / 4, similar to the direct light entry surface 4.

[0049] In order to achieve high luminous efficiency and a clean, narrow focusing, the direct light entry surface 4 and the direct light exit surface 7 can be designed to be smooth and highly transparent, in particular without major or no faceting and / or without matting.

[0050] Preferably, the direct light entry surface 4, which is convex in the manner described above, can be positioned and contoured relative to the light source in such a way that the direct light entry surface 4 captures a cone of light coming from the light source 2 with a cone angle of less than 2 × 40° or less than 2 × 30° or, in particular, less than 2 × 20°, cf. Fig. 3a and Fig. 3b.

[0051] A relatively small angle of incidence of the direct light entry surface 4 of, for example, 2 × 30° or 2 × 20° can ensure sufficient crossing of the light rays inside the lens 2 and at the same time enable a narrow focusing of the direct light beam 10 emanating from the light exit surface 7 in order to sufficiently eliminate unwanted imaging effects and at the same time ensure a narrow focusing.

[0052] The in Fig. Figure 5, comparing the light distributions in the target area between a conventional collimator lens and a lens according to the invention, whose direct light entry and exit surfaces are strongly convexly contoured as described, illustrates the elimination of the imaging effect. While an eccentric offset of the colored LED elements can be seen in a conventional collimator lens (see the lower series of illustrations), the inventive lens exhibits a different effect. Fig. 5, with the same eccentric offset of the colored LED elements at the light source, no such eccentric offset is visible when the lens according to the invention is used, cf. the top row of the Fig. 5.

[0053] How Fig. Figure 4 illustrates that the outer ring-shaped area of ​​lens 2, which in the design according to Fig. The lens shown in Figure 1 can also be replaced by a reflector 11, which surrounds the central lens part with the direct light entry and exit surfaces 4, 7. Such a hybrid optic works analogously to lens 2 according to Figure 1. Fig. 1 described. The central lens part 2 is responsible for the direct light beam 10, while the indirect light beam 9 is shaped with the assistance of the reflector 11.

Claims

[1] Spotlight with a light source (3) and a lens (2) for forming a beam (9, 10), wherein the lens (2) has coordinated direct light entry and exit surfaces (4; 7) for capturing light from the light source and emitting an unreflected direct light beam (10), characterized by that the said direct light entry and exit surfaces (4; 7) are each convexly contoured in such a way that the light rays thrown from the direct light entry surface (4) onto the direct light exit surface (7) cross each other in the interior of the lens (2) and are bundled again by the direct light exit surface (7) as a direct light beam bundle (10). [2] Spotlight according to the preceding claim, wherein the direct light entry surface (4) and / or the direct light exit surface (7) is conically contoured and forms a cone angle in the range of 2 × 15° to 2 × 50°. [3] Spotlight according to the preceding claim, wherein the direct light entry surface (4) has a cone angle of 2 × 15° to 2 × 30° or 2 × 20° to 2 × 25° and the direct light exit surface (7) has a cone angle of 2 × 30° to 2 × 55° or 2 × 40° to 2 × 50°. [4] Spotlight according to claim 1, wherein the direct light entry surface (4) and / or the direct light exit surface (7) is convexly contoured in the shape of a sugarloaf or pine cone. [5] Spotlight according to one of the preceding claims, wherein the direct light entry surface (4) and / or the direct light exit surface (7) has a length / diameter ratio (L / D) of 2 / 3 to 4 / 3 or 3 / 4 to 5 / 4. [6] Spotlight according to one of the preceding claims, wherein the direct light entry surface (4) has a collecting angle of 2 × 10° to 2 × 40° or 2 × 20° to 2 × 30°. [7] Spotlight according to the preceding claim, wherein the direct light entry surface (4) is contoured and arranged relative to the light source (3) in such a way that the direct light entry surface (4) captures a light cone which is emitted by the light source (3) at a cone angle of 2 × 10° to 2 × 40° or 2 × 20° to 2 × 30° onto the lens (2), in particular coaxially to the lens (2). [8] Spotlight according to one of the preceding claims, wherein the direct light exit surface (7) and the direct light entry surface (4) are smooth and transparent without faceting and without matting. [9] Spotlight according to one of the preceding claims, wherein the direct light entry surface (4) and the direct light exit surface (7) are matched to one another in such a way that the direct light beam (10) emitted by the lens (2) has a focus at infinity or has an expansion angle of < 2 × 5°. [10] Spotlight according to one of the preceding claims, wherein the direct light entrance surface (4) and the direct light exit surface (7) form a central lens part and are surrounded by indirect light entrance and exit surfaces (5; 8) which form an annular outer lens part and are matched to one another in such a way that light coming from the light source (3) is captured and formed into a reflected indirect light beam (9). [11] Radiator according to the preceding claim, wherein the direct light beam (10) and the indirect light beam (9) are coaxial with each other and / or superimposed and / or congruent with each other in a target area. [12] Spotlight according to one of the two preceding claims, wherein the indirect light entry surface (5) forms a peripheral surface which delimits a cup-shaped light entry recess, from the bottom of which the convex direct light entry surface (5) projects towards the light source (3) and is surrounded by the indirect light entry surface (5). [13] Spotlight according to one of the two preceding claims, wherein the indirect light exit surface (8) has an annular contour and surrounds the direct light exit surface (7). [14] Spotlight according to one of claims 1 to 11, wherein the direct light entry surface (4) and the direct light exit surface (7) form a central part of a hybrid optic which, in addition to the lens (2), has a reflector (11) which is contoured in a bowl-shaped manner and surrounds the lens (2).

Citation Information

Patent Citations

  • Lamp body structure

    CN202613327U

  • Indirect lighting lamp

    DE102016104223A1

  • Flat or rod-shaped light guide element

    DE102017130790A1

  • Optical system for a light

    WO2017186465A1

  • CN000202613327U