CN216384028U - Small-angle optical system module and lighting lamp - Google Patents

Abstract

The utility model discloses a small-angle optical system module and an illuminating lamp, wherein the small-angle optical system module comprises a light source, a Fresnel lens and a curved reflector, wherein at least part of curved surface of the curved reflector is formed by an elliptical arc; the position of the curved reflector opposite to the light source is provided with a through hole. The small-angle optical system module disclosed by the utility model can improve the optical efficiency on the premise of ensuring small-angle illumination.

Description

Small-angle optical system module and lighting lamp

Technical Field

The utility model relates to the technical field of optics, in particular to a small-angle optical system module and an illuminating lamp.

Background

At present, in many application scenes, a smaller and lighter lighting lamp is desired. It is known from the law of conservation of etendue that in the case of a small size lens or lamp, it is difficult to achieve small angle illumination unless optical efficiency is sacrificed.

An optical system as shown in fig. 1, which includes a light source 11, a lens mounting bracket 12, a fresnel lens 13, and a Printed Circuit Board (PCB) 14, has difficulty in achieving efficient small-angle illumination. For example, when the light source 11 is a surface light source of 1mm × 1mm and the diameter of the fresnel lens 14 is 52mm, an optical system with an optical efficiency of only 40% at an angle of 2 ° can be made.

It can be seen that the optical efficiency of the existing small-angle optical system is very low, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a small-angle optical system module and an illuminating lamp, which are used for improving the optical efficiency of a small-angle optical system.

In order to solve the technical problem, the utility model is realized as follows:

in a first aspect, a small-angle optical system module is provided, which includes a light source 21, a fresnel lens 23, and a curved reflector 25;

at least part of the curved surface of the curved reflector 25 is formed by an elliptical arc;

the curved reflector 25 is arranged between the exit surface of the light source 21 and the entrance surface of the fresnel lens 23, the curved reflector 25 covers the light source 21, the long axis of the elliptical arc forming the curved reflector 25 coincides with the exit surface of the light source 21, and at least part of the exit surface of the light source 21 is located within two focuses of the elliptical arc forming the curved reflector 25;

the curved reflector 25 has a through hole 251 at a position opposite to the light source 21.

In a second aspect, there is provided a lighting fixture comprising at least one small angle optical system module as described in the first aspect.

In the small-angle optical system module provided by the embodiment of the present invention, a curved reflector 25, at least part of which is curved and formed by an elliptical arc, is additionally arranged between the exit surface of the light source 21 and the entrance surface of the fresnel lens 23, the curved reflector 25 covers the light source 21, the long axis of the elliptical arc forming the curved reflector 25 coincides with the exit surface of the light source 21, at least part of the exit surface of the light source 21 is located within two focuses of the elliptical arc forming the curved reflector 25, and a through hole 251 is further formed in the position of the curved reflector 25, which is right opposite to the light source 21. Based on the principle of double focuses of the ellipse, the light emitted from the first focus is reflected to fall on the second focus, and the light emitted from the space between the first focus and the second focus still falls on the first focus and the second focus. Therefore, a part of the light emitted from the light source 21 is directly emitted through the through hole 251 to form direct light, and is emitted after being collimated after reaching the fresnel lens 23, and a part of large-angle light is emitted back by the curved reflector 25 to form reflected light, and is converged on the light source 21 again to be emitted as the light source again, and so on to form energy circulation, thereby improving the utilization rate of the emitted light of the light source 21.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a front view of an optical system in the prior art.

Fig. 2A is a front view of a small-angle optical system module according to an embodiment of the present invention.

Fig. 2B is a top view of a small-angle optical system module according to an embodiment of the utility model.

FIG. 2C is a cross-sectional view A-A of the low angle optical system module shown in FIG. 2B.

Fig. 3 is a schematic diagram of the relationship between the opening half angle of the through hole 251 and the size of the fresnel lens 23 according to an embodiment of the present invention.

Fig. 4 is a schematic view of a mounting structure of the mounting bracket 22 and the curved reflector 25 in the small-angle optical system module according to the embodiment of the present invention.

Fig. 5A is a schematic three-dimensional structure diagram of a fresnel lens 23 according to an embodiment of the present invention.

Fig. 5B is a top view of a fresnel lens 23 according to an embodiment of the present invention.

Fig. 6A is a schematic diagram of an optical path of an optical system shown in fig. 1.

Fig. 6B is a schematic optical path diagram of a small-angle optical system module according to an embodiment of the present invention.

Fig. 7A is a polar diagram of light intensity for an optical system as shown in fig. 1.

Fig. 7B is a light intensity polar diagram of a small-angle optical system module according to an embodiment of the utility model.

Fig. 8A is a spot diagram of an optical system shown in fig. 1.

Fig. 8B is a speckle pattern of a small-angle optical system module according to an embodiment of the present invention.

Fig. 9 is an equation diagram of an ellipse.

Fig. 10A is a schematic diagram of the light distribution of a curved reflector with a semi-ellipsoidal structure according to an embodiment of the present invention.

Fig. 10B is a schematic diagram of light distribution of a curved reflector with a hemispherical structure according to an embodiment of the present invention.

FIG. 11A is a plot of the source center NS ray drop after reflection by a curved reflector of half-ellipsoidal configuration.

FIG. 11B is a plot of the source center NS ray drop after reflection by a curved reflector in a hemispherical configuration.

FIG. 12A is a plot of the NS ray drop at the edge of the source after reflection by a curved reflector of half-ellipsoidal configuration.

FIG. 12B is a plot of the NS ray drop at the edge of the source after reflection by a curved reflector in a hemispherical configuration.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to improve the efficiency of the small-angle optical system, the embodiment of the utility model provides a small-angle optical system module, and the structure of the module, the beneficial effects that the module can achieve, and the reason why the module can achieve such beneficial effects will be described below with reference to the accompanying drawings.

First, a structure of a small-angle optical system module according to an embodiment of the present invention is described.

As shown in fig. 2A, fig. 2B and fig. 2C, a small-angle optical system module according to an embodiment of the present invention may include: a light source 21, a fresnel lens 23 and a curved reflector 25.

Wherein at least part of the curved surface of the curved reflector (25) is formed by an elliptical arc, the curved reflector (25) is arranged between the emergent surface of the light source (21) and the incident surface of the Fresnel lens (23), and the curved reflector (25) covers the light source (21).

Further, similarly to the optical system in the prior art (shown in fig. 1), the fresnel lens 23 is mounted on the lens mounting bracket 22, the center of the light source 21 coincides with the focal point of the fresnel lens 23, and the light source 21 is embedded on the printed circuit board 24.

Furthermore, a through hole 251 is formed at a position of the curved reflector 25 facing the light source 21, after the through hole 251 is formed, a part of light emitted from the light source 21 passes through the through hole 251 to form direct light, reaches the fresnel lens 23, is collimated and then emitted, and at least a part of the other part of light is emitted back by the curved reflector 25 to form reflected light.

Further, as shown in fig. 2A, 2B and 2C, after the curved reflector 25 is covered on the light source 21, the major axis of the elliptical arc constituting the curved reflector 25 coincides with the exit surface of the light source 21, and at least a part of the exit surface of the light source 21 is located within two focal points of the elliptical arc constituting the curved reflector 25.

Based on the principle of double focuses of the ellipse, the light emitted from the first focus is reflected to fall on the second focus, and the light emitted from the space between the first focus and the second focus still falls on the first focus and the second focus. Therefore, the small-angle optical system module provided by the embodiment of the utility model can enable the part of the light emitted by the light source 21 and reflected by the curved reflector 25 to be converged on the light source 21 again, so that the light source can be recycled, and the optical efficiency is finally improved.

In one embodiment, the curved reflector 25 may be an elliptical cylinder formed by stretching a half elliptical arc in the axial direction, i.e., stretching a half elliptical arc a predetermined distance in the x-axis direction as shown in fig. 2A. In general, for an ellipse, its major half axis is denoted by a and its minor half axis is denoted by b, and the equation is: x is the number of²/a²+y²/b²1. In this embodiment, the major axis of at least a part of the elliptical arc constituting the curved reflector 25 coincides with the emission surface of the light source 21, and the minor axis of the elliptical arc constituting the curved reflector 25 is perpendicular to the emission surface of the light source 21.

In another embodiment, the curved reflector 25 may be a half ellipsoid with the major and middle half axes of the half ellipsoid being equal. In general, for an ellipsoid, its longer half axis is denoted by a, its half axis is denoted by b, and its shorter half axis is denoted by c, the equation is: x is the number of²/a²+y²/b²+z²/c²1. Thus, in this embodiment, a ═ b of the half ellipsoid>c, and after the curved reflector 25 is mounted, theThe xy plane of the half ellipsoid coincides with the exit surface of the light source 21, and the z axis of the corresponding half ellipsoid is perpendicular to the exit surface of the light source 21, that is, the semi-minor axis of the half ellipsoid is perpendicular to the exit surface of the light source 21, and the center of the half ellipsoid coincides with the center of the exit surface of the light source 21. It will be appreciated that the curved reflector 25 is equivalent to being obtained by rotating an ellipse, having a major semi-axis equal to b and a minor semi-axis equal to c, lying on the yz plane by 180 degrees about the z-axis.

It is understood that the structure of the curved reflector 25 may not be limited to the half elliptic cylindrical surface or the half elliptic surface, and may be other shapes as long as the curved surface formed by the elliptic arc is included, and after the curved reflector 25 is covered on the light source 21, the long axis of the elliptic arc formed by the curved reflector 25 coincides with the exit surface of the light source 21, and at least a part of the exit surface of the light source 21 is located within two focuses of the elliptic arc formed by the curved reflector 25.

In one embodiment, the light source 21 has an elongated shape, and the two ends of the light source 21 are located at the two foci of the elliptical arc of the curved reflector 25. For example, as shown in fig. 2B, if the curved reflector 25 is a half ellipsoid, the exit surface of the light source 21 has a long shape, and the first end 211 of the exit surface of the light source 21 is located at the first focus F1 of the half ellipsoid, and the second end 212 of the exit surface of the light source 21 is located at the second focus F2 of the half ellipsoid. The installation mode can enable the part of the light emitted from the first end 211 reflected by the curved surface reflector 25 to be converged on the second end 212 again to be used as the light source, and enable the part of the light emitted from the second end 212 reflected by the curved surface reflector 25 to be converged on the first end 211 again to be used as the light source, so that the optical efficiency of the small-angle optical system module provided by the embodiment of the utility model is improved.

In another embodiment, if the curved reflector 25 is a half ellipsoid, the exit surface of the light source 21 may be circular, and the diameter of the exit surface of the light source 21 is exactly equal to the focal length of the half ellipsoid, so that the edge of the light source 21 is exactly coincident with the curve formed by the two focal points of the half ellipsoid, and the portion of the light emitted from the edge of the light source 21 reflected by the curved reflector 25 can be converged on the light source 21 again as the light source, thereby improving the optical efficiency of the small-angle optical system module provided by the embodiment of the present invention.

It should be understood that the shape and size of the emitting surface of the light source 21 may not be limited to the two shapes, and may be other situations, as long as at least part of the emitting surface of the light source 21 is ensured to be located within two focuses of the elliptical arc forming the curved surface reflector 25, the utilization rate of the large-angle light in the emitting light of the light source 21 may be improved more or less, so that the optical efficiency of the small-angle optical system module provided in the embodiment of the present invention can be improved.

In the embodiment of the present invention, the shape of the through hole 251 formed in the top of the curved reflector 25 is not limited. As an example, the through hole 251 may have a circular shape and be concentric with the light source 21, and it is understood that when the curved reflector 25 has a half ellipsoid, the through hole 251 and the half ellipsoid are also concentric because the center of the curved reflector 25 coincides with the center of the light source 21.

Further, in one embodiment, the size (e.g., diameter, or opening angle relative to the center of the curved reflector) of the through hole 251 formed at the top of the curved reflector 25 is determined according to a ratio of a first energy to a second energy, wherein the first energy is an energy emitted directly from the light source 21 via the through hole 251, and the second energy is an energy reflected back from the curved reflector 25 in the light emitted from the light source 21, that is, the size of the through hole 251 is determined according to an energy distribution ratio of the direct light to the reflected light in the outgoing light from the light source.

Further, in another embodiment, the size of the through hole 251 is varied with the size of the fresnel lens 23. As shown in fig. 3, the focal point of the fresnel lens 23 coincides with the center of the light source 21, and in order to make the most of the light emitted from the light source 21, when the curved reflector 25 is a half ellipsoid, the opening half angle θ of the through hole 251 relative to the center of the light source 21 is equal to a target angle, where the target angle is an angle between a first connection line and a second connection line, the first connection line is a connection line between the center a of the fresnel lens 23 and the focal point O of the fresnel lens 23, and the second connection line is a connection line between the edge B of the fresnel lens 23 and the focal point O of the fresnel lens 23, that is, the target angle is ≧ AOB. In fig. 3, r denotes half of the outer diameter of the fresnel lens 23, and f denotes the focal length of the fresnel lens 23.

In a specific implementation, the size of the through hole 251 may be determined comprehensively according to the above-described energy distribution ratio and the size of the fresnel lens 23. Generally, the size of the through hole 251 is larger than the size of the light source 21 and smaller than the outer diameter of the fresnel lens 23.

Different sizes of through-holes 251 (opening half-angle relative to the center of the curved reflector 25) contribute differently to the optical efficiency of a small-angle optical system module provided by embodiments of the present invention, and table 1 lists the optical efficiencies corresponding to different sizes of circular through-holes 251.

TABLE 1

As can be seen from table 1, the larger the opening half angle of the through hole 251 with respect to the center of the curved reflector, the higher the utilization rate of the light emitted from the light source 21.

Optionally, in the embodiment of the present invention, the light source 21 is an LED light source.

Further, as shown in fig. 2A, fig. 2B and fig. 2C, the small-angle optical system module according to the embodiment of the present invention further includes a printed circuit board 24, wherein the light source 21 is disposed in the center of the printed circuit board 24, and the curved reflector 25 covers the printed circuit board 24.

Since the curved reflector 25 is disposed in the light-emitting direction of the light source 21, it is inevitable that some light is reflected to the portion of the printed circuit board where the light source 21 is not disposed, and in order to utilize the light, the optical efficiency of the small-angle optical system module provided in the embodiment of the present invention is further improved, optionally, a reflective coating may be coated on a portion of the side surface of the printed circuit board 24 facing the curved reflector 25, which is not occupied by the light source 21, so as to reflect the light reflected to the printed circuit board 24 again, and the reflected light may have two directions, one of which is incident to the reflective wall of the curved reflector 25, reaches the light source 21 after being reflected by the reflective wall of the curved reflector 25, and is used as the light source again; another direction is to direct light directly out of the through hole 251 to the fresnel lens 23. It is understood that the utilization efficiency of the light can be improved in either case.

Alternatively, in order to enhance the light reflection effect of the printed circuit board 24 as much as possible, the color of the reflective coating applied on the printed circuit board 24 may be white.

Further, the small-angle optical system module provided in the embodiment of the present invention may further include a lens mounting bracket 22, where the size of the lens mounting bracket 22 is designed according to the size (outer diameter and focal length) of the fresnel lens 23, and the specific design belongs to the prior art, and is not described herein again.

Alternatively, the lens mounting bracket 22 may be made of plastic and the curved reflector 25 may be die cast from an aluminum alloy.

Optionally, the lens mounting bracket 22 may also be used to mount a printed circuit board 24 and a curved reflector 25. Fig. 4 shows a three-dimensional view of the curved reflector 25 mounted on the lens mounting bracket 22. As can be seen from fig. 4 and fig. 2A, 2B and 2C, when the curved reflector 25 is a half ellipsoid surface, the curved reflector 25 is buckled on the light emitting surface of the light source 21 like an inverted bowl, and a circular through hole 251 is formed at the top of the curved reflector 25 to divide the light emitted from the light source 21 into direct light and reflected light, so as to perform the energy distribution function on the light emitted from the light source 21.

Fig. 5A shows a schematic three-dimensional structure of the fresnel lens 23, and fig. 5B shows a top view of the fresnel lens 23. The fresnel lens 23 used in the embodiment of the present invention is similar to the fresnel lens in the related art, and therefore, will not be described in detail.

In an ideal optical system, the etendue of the light beam is conserved after passing through the optical system. For weighing the required area and solid angle and thus determining the structural parameters. Etendue definition: the area through which the beam passes and the integral of the solid angle occupied by the beam.

E＝n²∫∫cos(θ)dAdΩ

Where θ is the angle between the normal of the facet dA and the central axis of the solid angle d Ω.

It can be known from the etendue formula that it is difficult to make a small angle illumination with high light efficiency by a single small-sized optical surface optical lens (such as the optical system shown in fig. 1 only includes the fresnel lens), for example, when the light source 11 is a surface light source with 1mm × 1mm, and the diameter of the fresnel lens 14 is 52mm, it is only possible to make an optical system with an optical efficiency of 2 ° angle of 40%. Furthermore, certain conditions are inevitably abandoned in order to meet certain conditions, so that the mode of sacrificing optical efficiency is mostly adopted in the prior art to ensure the realization of small-angle illumination, and most of light rays are abandoned by only utilizing the branch light rays, which undoubtedly causes energy loss and low optical efficiency.

The small-angle optical system module provided in the embodiment of the present invention is equivalent to that on the basis of the optical system (a small-angle optical system in the prior art) shown in fig. 1, a curved reflector 25 is added to improve the utilization efficiency of the light emitted from the light source 21, that is, the optical efficiency, while realizing small-angle illumination. In addition, the color temperature (K) value is also improved by adding the curved reflector 25.

The following describes in detail the beneficial effects that can be obtained by the small-angle optical system provided by the embodiment of the present invention.

Fig. 6A shows a schematic optical path diagram of an optical system shown in fig. 1. Fig. 6B is a schematic diagram illustrating an optical path of a small-angle optical system module according to an embodiment of the present invention. As can be seen from comparing fig. 6A and 6B, the light utilization rate of the optical system using a single fresnel lens is significantly lower than that of the small-angle optical system module including the "curved reflector 25+ the fresnel lens 23" provided in the embodiment of the present invention, and some light reflection routes in the optical system using a single fresnel lens are disordered and cannot be effectively utilized, so the optical efficiency is low, whereas the small-angle optical system module including the "curved reflector 25+ the fresnel lens 23" provided in the embodiment of the present invention can efficiently utilize almost all light, and the optical efficiency is significantly higher.

FIG. 7A shows a polar plot of light intensity for one of the optical systems shown in FIG. 1. Fig. 7B shows a polar diagram of light intensity of a small-angle optical system module according to an embodiment of the present invention. Comparing fig. 7A and fig. 7B, it can be seen that the total light energy collection power, the optical efficiency and the maximum intensity of the small-angle optical system module provided by the embodiment of the present invention are significantly higher than those of the optical system shown in fig. 1.

Table 2 shows a comparison table of the advantageous effects of an optical system shown in fig. 1 and a small-angle optical system module provided by the embodiment of the present invention.

TABLE 2

As can be seen from table 2, in the case of using the same light source, the small-angle optical system module provided in the embodiment of the present invention has higher optical efficiency and K value in the case of realizing a smaller beam angle and a smaller field angle, specifically, the optical efficiency can be improved by 20%, and the K value can be improved by 100%.

Fig. 8A shows a spot diagram of an optical system shown in fig. 1. Fig. 8B shows a speckle pattern of a small-angle optical system module according to an embodiment of the present invention. With reference to table 2, comparing fig. 8A and 8B, it can be seen that the small-angle optical system module provided in the embodiment of the present invention has higher optical efficiency and K value under the condition of realizing smaller beam angle and field angle and almost the same spot effect.

Through the comparison, the small-angle optical system module provided by the embodiment of the utility model can greatly improve the optical efficiency and the K value on the premise of realizing smaller-angle illumination.

The following provides an example of the principle of how the above-mentioned effect can be achieved by the small-angle optical system module provided by the embodiment of the present invention.

In general, as mentioned above, for an ellipsoid, its semi-major axis is denoted by a, its semi-major axis is denoted by b, and its semi-minor axis is denoted by c, and its equation is: x is the number of²/a²+y²/b²+z²/c²1. In one example of embodiment of the present invention, when the curved reflector 25 is a half ellipsoid, the half ellipsoid has a ═ b>c, after the curved reflector 25 is installed, the xy plane of the half ellipsoid coincides with the exit surface of the light source 21, and the z axis of the corresponding half ellipsoid is perpendicular to the exit surface of the light source 21, that is, the semi-minor axis of the half ellipsoid is perpendicular to the exit surface of the light source 21, and the center of the half ellipsoid coincides with the center of the exit surface of the light source 21. It will be appreciated that the curved reflector 25 is equivalent to being obtained by rotating an ellipse, having a major semi-axis equal to b and a minor semi-axis equal to c, lying on the yz plane by 180 degrees about the z-axis.

As shown in fig. 9, for an ellipse with a semi-major axis equal to b and a semi-minor axis equal to c, parallel to the yz plane and passing through the origin, the equation is: y is²/b²+z²/c²1, wherein b>c>0, the two foci of the ellipse can be respectively denoted as F1 (i.e. the first focus), F2 (i.e. the second focus), with a distance of 2l between them, and the sum of the distances from any point M (y, z) on the ellipse to F1, F2 is equal to 2b, it is generally considered that a circle is a special case of an ellipse and, correspondingly, a sphere is a special case of an ellipsoid.

The bifocal principle of the ellipse is: any ellipse has two focuses, and the light emitted from the first focus will necessarily converge at the second focus, and for the special ellipse of circle, the light emitted from the center of the circle will converge to the center position again after being reflected by the circumference. This is still true extending this principle to ellipsoids. Specifically, as shown in fig. 10A, light emitted from an elliptical F1 is reflected around an ellipse and then converged to F2; as shown in fig. 10B, the light emitted from the center F is reflected circumferentially and then still converges on F.

The light source in small-angle illumination is generally an LED, and the LED usually utilizes a chip to excite light color fluorescent powder to emit light, so the LED is not a point light source in the traditional sense, but a surface light source. Based on this point, in the small-angle optical system module provided by the present invention, after the semi-ellipsoidal curved reflector 25 and the elongated LED light source are used, if one end of the LED (light source 21) is made to coincide with the first focal point of the curved reflector 25, and the other end of the LED is made to coincide with the second focal point of the curved reflector 25, the advantage is that all the light rays reflected by the curved reflector 25 in the light emitted by the LED are converged on the LED surface again, specifically, the light emitted from the first focal point is reflected to the second focal point, the light emitted from the second focal point is reflected to the first focal point, and the light emitted by the LED within the two focal points also falls between the two focal points. The reflected light which is converged on the surface of the LED again can excite the yellow fluorescent powder to emit light again, and the light can be regarded as a new Lambert light source to emit light on the surface of the LED, so that the circulation is continuous, the light utilization rate of the LED can be greatly improved, and the optical efficiency is further improved.

It should be noted that the difference between the ellipsoid and the sphere still exists, and since the LED is a surface light source, if the spherical structure is used as a reflector, the light at the edge of the LED still cannot be fully utilized, and the light utilization rate is relatively lower than that of the ellipsoid structure.

FIG. 11A shows a plot of the source center NS ray drop after reflection by a half-ellipsoidal reflector. FIG. 11B shows a plot of the source center NS ray drop after reflection from a curved reflector in a hemispherical configuration. FIG. 12A shows a plot of the NS ray drop at the edge of the source after reflection by a curved reflector of half-ellipsoidal configuration. FIG. 12B shows a source edge NS ray drop plot after reflection by a curved reflector in a hemispherical configuration. Comparing fig. 11A and 11B, it can be found that the light utilization ratio of the two light source centers is not much different for the optical systems respectively reflected by the curved surface reflectors of the semi-ellipsoidal structure and the spherical structure. However, as can be seen from comparing fig. 12A and 12B, the light utilization rates of the edges of the light sources of the optical system reflected by the curved reflectors of the semi-ellipsoidal structure and the semi-spherical structure are greatly different, specifically, the light emitted from the edges of the light sources can almost completely return to the surface of the light sources for secondary excitation after being reflected by the curved reflectors of the semi-ellipsoidal structure, while the light reflected by the reflectors of the semi-spherical structure is disordered, so that stray light is formed in the curved reflectors of the semi-spherical structure, and is difficult to be reused. Therefore, the curved reflector with the semi-ellipsoidal structure can better collect and utilize light emitted from the edge of the light source, and further improve the optical efficiency to a greater extent.

In summary, according to the small-angle optical system module provided in the embodiment of the present invention, the curved reflector including the curved surface formed by at least a part of the elliptical arc is additionally disposed between the exit surface of the light source and the entrance surface of the fresnel lens, so that light emitted from the light source can be redistributed, and light rays with large angle, which are sacrificed in the prior art and cannot be utilized, are reused, so that the optical efficiency is greatly improved, and the K value is also significantly improved on the premise of satisfying the small angle. In addition, the size of the through hole at the top of the curved reflector can be controlled, so that the lamp comprising the small-angle optical system module can realize illumination at different angles.

The small-angle optical system module provided by the embodiment of the utility model is suitable for scenes such as roofs, airports and the like which need key illumination and remote illumination. In addition, because fresnel lens is comparatively frivolous, consequently can make the size of whole small-angle optical system module more small and exquisite to the adaptation has the application scene of littleer requirement to the installation controlling part, satisfies small and exquisite, frivolous lighting requirements.

On the basis of the small-angle optical system module, the embodiment of the utility model also provides a lighting lamp, which can comprise at least one small-angle optical system module.

In practical application, a plurality of small-angle optical system modules can be combined and spliced according to actual lighting requirements and use scenes, and the lighting requirements of different powers are met. And when the lamp needs to be assembled, the small-angle optical system module in the lamp can be disassembled.

It can be understood that, since the lighting fixture provided by the embodiment of the present invention is obtained by combining and splicing at least one small-angle optical system module provided by the embodiment of the present invention, the optical efficiency and the K value can also be improved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (10)

1. A small-angle optical system module is characterized by comprising a light source (21), a Fresnel lens (23) and a curved reflector (25);

at least part of the curved surface of the curved reflector (25) is formed by an elliptical arc;

the curved reflector (25) is arranged between the emergent surface of the light source (21) and the incident surface of the Fresnel lens (23), the curved reflector (25) covers the light source (21), the long axis of an elliptic arc forming the curved reflector (25) is superposed with the emergent surface of the light source (21), and at least part of the emergent surface of the light source (21) is positioned within two focuses of the elliptic arc forming the curved reflector (25);

the curved reflector (25) is provided with a through hole (251) at the position right opposite to the light source (21).

2. The small angle optical system module of claim 1,

the curved reflector (25) is a half ellipsoid, wherein the major half axis and the middle half axis of the ellipsoid are equal, the minor half axis of the half ellipsoid is perpendicular to the emergent surface of the light source (21), and the center of the half ellipsoid coincides with the center of the emergent surface of the light source (21).

3. The small angle optical system module of claim 2,

the emergent surface of the light source (21) is in a strip shape, and two ends of the emergent surface of the light source (21) are respectively positioned on two focuses of the half ellipsoid.

4. The small angle optical system module of claim 2,

the exit surface of the light source (21) is circular, and the diameter of the exit surface of the light source (21) is equal to the focal length of the ellipsoid.

5. The small angle optical system module of any one of claims 2-4,

the through hole (251) is circular, and the through hole (251) is concentric with the semi-ellipsoid.

6. The small angle optical system module of claim 5,

the opening angle of the through hole (251) relative to the center of the ellipsoid is determined according to the ratio of a first energy to a second energy, wherein the first energy is the energy of the light emitted by the light source (21) which is directly emitted out through the through hole (251), and the second energy is the energy of the light emitted by the light source (21) which is reflected back by the curved reflector (25).

7. The small angle optical system module of claim 5,

the focal point of the Fresnel lens (23) coincides with the center of the light source (21), and the opening half angle of the through hole (251) with respect to the center of the light source (21) is equal to a target angle, wherein the target angle is an angle between a first line and a second line, the first line is a line between the center of the Fresnel lens (23) and the focal point of the Fresnel lens (23), and the second line is a line between the edge of the Fresnel lens (23) and the focal point of the Fresnel lens (23).

8. The small angle optical system module of claim 1, further comprising: a printed circuit board (24);

wherein the light source (21) is arranged in the center of the printed circuit board (24), the curved reflector (25) is covered on the printed circuit board (24), and the part of the side surface of the printed circuit board (24) facing the curved reflector (25) which is not occupied by the light source (21) is coated with a light reflecting coating.

9. The small angle optical system module of claim 8,

the color of the light reflecting coating is white.

10. A lighting fixture comprising at least one small angle optical system module as recited in any one of claims 1-9.

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