Optical lens and illumination lamp

Abstract

An optical lens (1) and an illumination lamp. The optical lens (1) comprises a base body (10), an incident area (100) provided at the bottom of the base body (10) and recessed inwards, a reflective area (101) provided at the top of the base body (10), and an emergent surface (114) provided at the outer peripheral side of the base body (10) and located between the incident area (100) and the reflective area (101), wherein a first incident surface (1001) is formed on the inner peripheral surface of the incident area (100), and a second incident surface (1002) is formed on the top surface of the incident area (100); a total reflection surface (113) is formed on the side surface of the reflective area (101) opposite to the second incident surface (1002); the optical lens (1) is configured such that: part of light entering the incident area (100) is incident by means of the first incident surface (1001) and then is emitted by means of the emergent surface (114); and the other part of the light entering the incident area (100) is incident by means of the second incident surface (1002), then is reflected by the total reflection surface (113), and finally is emitted by the emergent surface (114).

Description

Optical lens and lighting lamp

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202410417480.5, filed on April 8, 2024, and entitled "Optical lens and lighting lamp", and the Chinese patent application No. 202420704296.4, filed on April 8, 2024, and entitled "Optical lens and lighting lamp", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to an optical lens and a lighting lamp, and belongs to the technical field of lighting. BACKGROUND

[0004] At present, in the field of lighting, household lamps are mostly combined with multiple groups of LEDs and traditional diffusion lenses as light source schemes. Since the size of the LED light-emitting surface is small, the size of the light spot formed after the secondary light distribution of the traditional lens also has the problem of being small. If the size of the light spot is further expanded, obvious color difference will appear on the light spot. When it is applied to a lamp, the problem of insufficient irradiation uniformity is reflected. The usual solution is to increase the number of lens groups, which undoubtedly increases the production cost.

[0005] Therefore, it is necessary to improve the existing optical lens and lighting lamp to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide an optical lens that can expand the size of the light spot without weakening the uniformity of the light spot, further expanding the range of illumination.

[0007] To achieve the above purpose, the present application provides an optical lens, comprising a base body, an incident area arranged at the bottom of the base body and recessed inward, a reflection area arranged at the top of the base body, and an exit surface arranged at the outer peripheral side of the base body and located between the incident area and the reflection area, the inner peripheral surface of the incident area forms a first incident surface, and the top surface forms a second incident surface, the surface opposite to the second incident surface of the reflection area forms a total reflection surface.

[0008] The optical lens is configured such that a part of the light rays entering the incident area is incident through the first incident surface and then emitted through the exit surface, and another part of the light rays entering the incident area is emitted through the second incident surface and then reflected by the total reflection surface, and finally emitted through the exit surface.

[0009] As a further improvement of the present application, a transition refractive part is arranged between the first and second incidence surfaces, and part of the light rays passing through the transition refractive part is deviated towards the first incidence surface, and the other part is deviated towards the second incidence surface.

[0010] As a further improvement of the present application, the incidence angle of the light rays entering the incidence area and irradiating to the second incidence surface is 0-30°, and the incidence angle of the light rays entering the incidence area and irradiating to the first incidence surface is 30-60°.

[0011] As a further improvement of the present application, the base body has a central axis extending in the up-down direction, and the first incidence surface, the second incidence surface, the total reflection surface and the exit surface are all free curved surfaces and are symmetrically arranged left and right with respect to the central axis.

[0012] As a further improvement of the present application, in the extension direction of the central axis, the exit surface comprises a first curved surface and a second curved surface connected to each other, the first curved surface is recessed towards the inside of the base body and is arranged opposite to the total reflection surface, so that the light rays emitted from the total reflection surface reach the first curved surface and are then emitted, and the second curved surface is convex towards the outside of the base body, so that the light rays entering the first incidence surface are emitted after passing through the second curved surface.

[0013] As a further improvement of the present application, the first incidence surface, the second incidence surface, the total reflection surface and the exit surface are all formed by rotating a Bezier curve as a generatrix around the central axis.

[0014] As a further improvement of the present application, the side of the first incidence surface opposite to the exit surface is provided with a sandblasted coating.

[0015] The present application also aims to provide a lighting lamp which can expand the size of the light spot without weakening the uniformity of the light spot, and further expand the range of illumination.

[0016] To achieve the above-mentioned purposes, the present application provides a lighting lamp comprising the aforementioned optical lens.

[0017] As a further improvement of the present application, the lighting lamp comprises a bottom plate, a light source fixed on the bottom plate and a diffusion plate, the base body and the bottom plate are fixedly connected, the light source is opposite to the incidence area, and the diffusion plate is arranged outside the optical lens, so that the light rays emitted from the light source are reflected to the bottom plate after passing through the optical lens, and then are emitted after being reflected to the diffusion plate from the bottom plate.

[0018] As a further improvement of the present application, the distance between the bottom plate and the diffusion plate is a mixing distance, the light emitted by the light source can form a light spot on the diffusion plate, the mixing distance is between 30mm-50mm, and the diameter of the light spot is between 40mm-60mm.

[0019] As a further improvement of the present application, a transition refraction part is arranged between the first incident surface and the second incident surface, and the transition refraction part is located within the beam angle of the illumination lamp.

[0020] As a further improvement of the present application, the light reflected by the total reflection surface accounts for 50% of the light entering the incident area.

[0021] The beneficial effects of the present application are: the optical lens of the present application sets the first incident surface and the second incident surface in the incident area of the base, so that part of the light entering the incident area is emitted after the first incident surface and the exit surface, and part of the light is emitted after the second incident surface, the total reflection surface and the exit surface, thereby increasing the size of the light spot without weakening the uniformity of the light spot, and further expanding the illumination area of the light source. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a structural schematic diagram of an optical lens according to a preferred embodiment of the present application.

[0023] Fig. 2 is a sectional view of the optical lens shown in Fig. 1.

[0024] Fig. 3 is a light path diagram of the optical lens shown in Fig. 1.

[0025] Fig. 4 is a light path diagram of the light entering the second incident surface in Fig. 3.

[0026] Fig. 5 is a light path diagram of the light entering the first incident surface in Fig. 3.

[0027] Fig. 6 is a data table of the radiant intensity of the illumination lamp when the mixing distance is 30mm.

[0028] Fig. 7 is a light spot under the mixing distance of Fig. 6.

[0029] Fig. 8 is a data table of the radiant intensity of the illumination lamp when the mixing distance is 50mm.

[0030] Fig. 9 is a light spot under the mixing distance of Fig. 7.

[0031] Fig. 10 is a control scatter plot of drawing a curve generatrix. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be described in detail below in combination with the drawings and specific embodiments.

[0033] Please refer to the lighting lamp (not shown) shown in Figure 1 and Figure 3, the lighting lamp is provided with optical cavity and light source assembly containing in the optical cavity, the light source assembly includes optical lens 1, bottom plate 3, light source 2 fixed on the bottom plate 3 and diffusion plate, the optical lens 1 and the bottom plate 3 are fixedly connected, the light source 2 is opposite to the optical lens 1, the diffusion plate is covered on the outside of the optical lens 1, so that the light emitted by the light source 2 is reflected to the bottom plate 3 after passing through the optical lens 1, and then is emitted after being reflected to the diffusion plate from the bottom plate 3. That is, the light is reflected by the bottom plate 3, so that the light is further diffused on the basis of the original, to realize the effect of expanding the illumination range of the lighting lamp.

[0034] The distance between the bottom plate 3 and the diffusion plate is the mixing distance, the light emitted by the light source can form a light spot on the diffusion plate, the mixing distance is between 30mm-50mm, the diameter of the light spot is between 40mm-60mm, at this time, it can be obtained by experiment that the uniformity of the light spot is 85%-95%.

[0035] Specifically, please refer to Figures 6-9, when the mixing distance is 30mm, according to the radiation brightness, the uniformity of the light spot is 95%, when the mixing distance is 50mm, according to the radiation brightness, the uniformity of the light spot is 85%. That is, at this time, the uniformity of the light spot meets the lighting demand, which can expand the diameter of the light spot by adjusting the mixing distance, to further expand the effect of expanding the illumination range of the lighting lamp.

[0036] In the embodiment, the optical lens 1 can project the light emitted by the light source 2 onto the bottom plate 3, to realize the effect of expanding the illumination range of the lighting lamp. Of course, the selection of the lighting lamp is not required.

[0037] Please refer to Figure 2, the optical lens 1 includes base body 10, incident area 100 arranged at the bottom of the base body 10 and inwardly recessed, reflection area 101 arranged at the top of the base body 10, and exit surface 114 arranged at the outer circumferential side of the base body 10 and between the incident area 100 and the reflection area 101, the light emitted by the light source 2 is incident from the incident area 100 and is emitted from the exit surface 114.

[0038] The light source assembly further includes light source plate 20, the light source 2 is arranged on the light source plate 20, the base body 10 is provided with mounting groove 12 on one side of the incident area 100, and the light source plate 20 is arranged in the mounting groove 12, so that the light source 2 is located in the incident area 100 and emits light towards the incident area 100.

[0039] In the embodiment, the light source 2 is a lamp bead fixed on the bottom plate 3 and located at the center of the incident area 100 to emit light toward the incident area 100. Of course, the light source 2 is not limited to a lamp bead and can be adjusted according to actual conditions, but the area thereof should be less than or equal to the area of the incident area 100, that is, the light source 2 is always covered by the incident area 100 and emits light toward the incident area 100. Preferably, the area of the light source 2 is between 0-70*70 mm 2 .

[0040] In the recess direction of the incident area 100, the inner circumferential surface of the incident area 100 forms a first incident surface 1001 and the top surface forms a second incident surface 1002. The side of the incident area 100 relative to the exit surface 114 is provided with a refractive exit surface 111 opposite the first incident surface 1001 and a total reflection exit surface 112 opposite the second incident surface 1002. The side surface of the reflection area 101 opposite the second incident surface 1002 forms a total reflection surface 113. In the embodiment, the material of the optical lens 1 can be glass, transparent resin or silica gel transparent optical material. A sandblasted coating is provided on the refractive exit surface 111 to refract light by virtue of the different medium thereof from the optical lens 1.

[0041] Specifically, as shown in FIGS. 4 and 5, part of the light emitted by the light source 2 in the incident area 100 is emitted from the first incident surface 1001 and exits the exit surface 114 through the refractive exit surface 111. Another part of the light is emitted from the second incident surface 1002 and exits the total reflection surface 113 through the total reflection exit surface 112 and is then reflected to the exit surface 114. That is, by providing the total reflection surface 113, part of the light emitted from the refractive exit surface 111 and part of the light emitted from the total reflection exit surface 112 are finally emitted from the exit surface 114, that is, the side of the optical lens 1.

[0042] In the embodiment, a transition refractive portion 1003 is provided between the first incident surface 1001 and the second incident surface 1002. Part of the light incident through the transition refractive portion 1003 is deviated toward the side of the first incident surface 1001, and another part is deviated toward the side of the second incident surface 1002. That is, part of the light incident through the transition refractive portion 1003 is reflected to the exit surface 114 after passing through the total reflection surface 113, and another part is emitted from the exit surface 114 through the refractive exit surface 111.

[0043] Preferably, the light reflected by the total reflection surface 113 accounts for 50% of the light entering the incident area 100.

[0044] The base body 10 has a central axis 110 extending in the up-down direction, and the first incident surface 1001, the second incident surface 1002, the refractive exit surface 111, the total reflection exit surface 112, the total reflection surface 113, and the exit surface 114 are all free curved surfaces and are symmetrically arranged relative to the central axis 110. In this way, light rays can be uniformly emitted after passing through the optical lens 1, ensuring the uniformity of light brightness in different directions.

[0045] In this embodiment, the first incident surface 1001, the second incident surface 1002, the refractive exit surface 111, the total reflection exit surface 112, the total reflection surface 113, and the exit surface 114 are all free curved surfaces, which are all formed by rotating a Bezier curve as a generatrix around the central axis 110.

[0046] In the extension direction of the central axis 110, the exit surface 114 includes a first curved surface 1141 and a second curved surface 1142 connected to each other. The first curved surface 1141 is recessed towards the inside of the base body 10 and is arranged opposite to the total reflection surface 113, so that light rays emitted from the total reflection surface 113 are emitted after reaching the first curved surface 1141. The second curved surface 1142 is convex towards the outside of the base body 10 and is arranged opposite to the refractive exit surface 111, so that light rays entering the first incident surface 1001 are emitted after passing through the refractive exit surface 111 and then the second curved surface 1142.

[0047] The included angle between 50% maximum light intensity of the light source is the beam angle, and the junction of the refractive exit surface 111 and the total reflection exit surface 112 is located within the beam angle. That is, the transition refractive part 1003 is located within the beam angle of the lighting lamp. In this way, it is ensured that most of the light emitted by the light source 2 can pass through refraction or total reflection, ensuring the brightness of the lighting.

[0048] The beam angle is divided into two identical beam half-angles by the central axis 110, and the beam half-angles have a preset angle. When part of the light emitted by the light source 2 is within the preset angle, the light is emitted through the total reflection exit surface 112, and when part of the light emitted by the light source 2 is outside the preset angle, the light is emitted through the refractive exit surface 111. In this way, most of the light can be emitted towards the direction of the bottom plate 3 after refraction or total reflection.

[0049] In the embodiment, the preset angle is 30°, the light ray is defined as 0° on the central axis 110, when the light source 2 irradiates to the second incident surface 1002, the incident angle is α, the incident angle is 0-30°, when the light source 2 irradiates to the first incident surface 1001, the incident angle is β, the incident angle is 30-60°. Of course, in other embodiments, the preset angle can be adjusted according to the actual situation, which is not limited.

[0050] Please refer to FIG. 10, the application also provides a manufacturing method of the optical lens 1, comprising:

[0051] Modeling: drawing the optical lens 1;

[0052] Drawing the optical lens 1 comprises:

[0053] (1) Drawing a curve generatrix: selecting a plurality of scattered points on a two-dimensional coordinate, sequentially connecting to form at least two initial line segments which do not intersect each other, taking a Bezier curve as the base of the two initial line segments, performing segmented calculation according to the coordinates of the scattered points to obtain two generatrix equations, and drawing a curve generatrix according to the generatrix equations;

[0054] (2) Drawing a curved surface according to the curve generatrix: one end of the curve generatrix is connected to the base body 10, and the other end is connected to the central axis 110, the curve generatrix is rotated around the central axis 110 for one revolution to form a curved surface, and the exit surface is manufactured on the base body 10 according to the curved surface.

[0055] Wherein, each initial line segment comprises at least three scattered points P0, P1 and P2, the connecting line of the scattered points is subjected to a second-order spline interpolation, and is constrained by the following boundary equation: x =(1-n) 2 P 0x +2n(1-n)P 1x +n 2 P 2x P y =(1-n) 2 P 0y +2n(1-n)P 1y +n 2 P 2y

[0056] Wherein, n is a normalized value of the order of each control point on the curve generatrix, P x and P y are the horizontal and vertical coordinates thereof on the two-dimensional coordinate system.

[0057] In the embodiment, the curve generatrix has four segments, including L1, L2, L3, L4, and four equations can be obtained according to the preset scatter point coordinates: L1=a1-39.12x+23.6x 2 -5.97x 3 +0.55x 4 L2=a2-288.17x+89.39x 2 -12.35x 3 +0.64x 4 L3=a3+13.43x-45.4x 2 +68.22x 3 +38.4x 4 L4=a4-10.75x+3.27x 2 -4.43x 3 +0.0224x 4

[0058] wherein a1, a2, a3 and a4 are irrelevant constants, which can be arbitrarily taken, x is the horizontal coordinate of the scatter point, and the values of L1, L2, L3 and L4 obtained are the vertical coordinates of the scatter point, and other coordinates on the line segment can be determined according to the equations. Of course, for different preset scatter point coordinates, different equations are obtained, which is not limited. Preferably, the four curve generatrices L1, L2, L3 and L4 respectively obtain the exit surface 114, the total reflection surface 113, the refractive exit surface 111 and the total reflection exit surface 112 after rotating around the central axis 110. Of course, the refractive exit surface 111 and the first incident surface 1001 are two sides of the same surface, and the total reflection exit surface 112 and the second incident surface 1002 are also two sides of the same surface, which will not be described in detail.

[0059] In summary, the optical lens 1 and the lighting lamp of the present application can increase the size of the light spot and further expand the illumination area of the light source on the basis of not weakening the uniformity of the light spot by arranging the first incident surface 1001 and the second incident surface 1002 in the incident area 100 of the base body 10, so that part of the light emitted from the light source 2 is emitted after the first incident surface 1001 and the exit surface 114, and part of the light is emitted after the second incident surface 1002, the total reflection surface 113 and the exit surface 114.

[0060] The above embodiments are only used to illustrate the technical solutions of the present application and not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical lens, comprising a base (10), an incident area (100) arranged at the bottom of the base (10) and recessed inward, a reflection area (101) arranged at the top of the base (10), and an exit surface (114) arranged on the outer peripheral side of the base (10) and located between the incident area (100) and the reflection area (101), wherein the inner peripheral surface of the incident area (100) forms a first incident surface (1001), and the top surface forms a second incident surface (1002), and the surface of the reflection area (101) opposite to the second incident surface (1002) forms a total reflection surface (113); The optical lens is configured as follows: a portion of the light entering the incident area (100) is incident through the first incident surface (1001) and then emitted through the exit surface (114); another portion of the light entering the incident area (100) is incident through the second incident surface (1002) and then reflected by the total reflection surface (113) and finally emitted through the exit surface (114).

2. The optical lens according to claim 1, wherein: A transition refractive portion (1003) is provided between the first incident surface (1001) and the second incident surface (1002), and part of the light incident through the transition refractive portion (1003) is offset toward the first incident surface (1001), and the other part is offset toward the second incident surface (1002).

3. The optical lens according to claim 1, wherein: The incident angle of the light entering the incident area (100) to the second incident surface (1002) is 0 to 30 degrees, and the incident angle of the light entering the incident area (100) to the first incident surface (1001) is 30 to 60 degrees.

4. The optical lens according to claim 1, wherein: The base (10) has a central axis (110) extending in the up-down direction, and the first incident surface (1001), the second incident surface (1002), the total reflection surface (113) and the exit surface (114) are all free-form surfaces and are respectively arranged symmetrically with respect to the central axis (110).

5. The optical lens according to claim 4, wherein: In the extension direction of the central axis (110), the exit surface (114) includes a first curved surface (1141) and a second curved surface (1142) connected to each other, the first curved surface (1141) is recessed toward the interior of the base (10) and is arranged opposite to the total reflection surface (113), so that light emitted from the total reflection surface (113) reaches the first curved surface (1141) and then exits, and the second curved surface (1142) is convex toward the exterior of the base (10), so that light incident on the first incident surface (1001) is emitted after passing through the second curved surface (1142).

6. The optical lens according to claim 4, wherein: The first incident surface (1001), the second incident surface (1002), the total reflection surface (113), and the exit surface (114) are all formed by rotating around the central axis (110) using a Bezier curve as a generatrix.

7. The optical lens according to claim 1, wherein: A sandblasting coating is provided on a side of the first incident surface (1001) opposite to the exit surface (114).

8. A lighting fixture, comprising the optical lens (1) according to any one of claims 1 to 7.

9. The lighting fixture according to claim 8, wherein: The lighting fixture comprises a base plate (3), a light source (2) fixed on the base plate (3), and a diffusion plate; the base (10) and the base plate (3) are fixedly connected; the light source (2) faces the incident area (100); the diffusion plate covers the outside of the optical lens (1), so that the light emitted by the light source (2) is reflected to the base plate (3) after passing through the optical lens (1), and then reflected from the base plate (3) to the diffusion plate before being emitted.

10. The lighting fixture according to claim 9, wherein: The distance between the bottom plate (3) and the diffusion plate is a light mixing distance, and the light emitted by the light source (2) can form a light spot on the diffusion plate. The light mixing distance is between 30 mm and 50 mm, and the diameter of the light spot is between 40 mm and 60 mm.

11. The lighting fixture according to claim 8, wherein: A transition refractive portion (1003) is provided between the first incident surface (1001) and the second incident surface (1002), and the transition refractive portion (1003) is located within the beam angle of the lighting fixture.

12. The lighting fixture according to claim 8, wherein: The light reflected by the total reflection surface (113) accounts for 50% of the light entering the incident area (100).

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