CN109489002B - Lens, lamp adopting lens and design method of lens - Google Patents

Lens, lamp adopting lens and design method of lens Download PDF

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Publication number
CN109489002B
CN109489002B CN201811260278.7A CN201811260278A CN109489002B CN 109489002 B CN109489002 B CN 109489002B CN 201811260278 A CN201811260278 A CN 201811260278A CN 109489002 B CN109489002 B CN 109489002B
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lens
area
light
optical axis
equal
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CN109489002A (en
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黄庸源
霍永峰
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Chengdu Herculux Optoelectronics Technology Co ltd
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Chengdu Herculux Optoelectronics Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lenses (AREA)

Abstract

The invention relates to the technical field of illumination, in particular to a lens, a lamp adopting the lens and a design method of the lens, wherein an incident area and an emergent area are arranged on the lens, a reflecting area is formed on the outer side wall surface between the emergent area and the incident area, and the emergent area comprises a first emergent area and a second emergent area surrounding the first emergent area; the second emergent area comprises a base surface and a plurality of protruding units arranged on the base surface, the base surface is provided with a large end and a small end, the distance between the small end and the large end of the base surface is H1 in the direction along the optical axis of the lens, D1 is more than or equal to 3 and more than or equal to D1/H1 is more than or equal to 1.1 in the direction perpendicular to the optical axis of the lens; the protruding unit is arranged around the lens optical axis, and on a plane passing through the lens optical axis, at least one part of light rays are intersected after passing through the protruding unit.

Description

Lens, lamp adopting lens and design method of lens
Technical Field
The invention relates to the technical field of illumination, in particular to a lens, a lamp adopting the lens and a design method of the lens.
Background
In the technical field of illumination, in order to make a lamp output a light field meeting illumination requirements, a lens or a light release cup is generally required to be arranged, light rays emitted by a light source are adjusted through each optical surface on the lens or a light reflection cup, a plurality of light beams emitted by the light source are emitted at the same or different angles according to a designed light path after passing through the lens or the light reflection cup, and then an illumination light spot meeting design requirements is formed at a designed illumination position.
For example, the application number is: 201721828999.4 Chinese patent: the invention discloses a collimating LED lens and a collimating LED lamp, as shown in fig. 1, the lens comprises a horn-shaped lens body 30, and the size of the lens body 30 increases from an incident end to an emergent end. The incident end of the lens body 30 is provided with an incident groove 31, the groove bottom of the incident groove 31 forms a first incident surface 32, and the side surface of the incident groove 31 forms a second incident surface 33. The outer side surface of the lens body 30 is provided with a plurality of reflection steps 35, a reflection surface 36 is formed between adjacent reflection steps 35, the light refracted by the second incidence surface 33 is reflected by the reflection surface 36, and in actual use, as shown in fig. 2, the light emitted by the LED lamp 20 enters from the first incidence surface 32, and then exits from the first exit surface 34 to form collimated light. The other path is incident from the second incident surface 33, is reflected by the reflecting surface 36 after refraction, and the reflected light is emitted by the light emitting step 37, and the light emitted by the light emitting step 37 is collimated light, so that the direction of the collimated light emitted by the first emitting surface 34 is consistent.
Although the lens structure can collect the light emitted by the light source to form the illumination light spot with a required shape, the defect still exists, in the actual light distribution work of the lens structure, the light incident from the second incident surface is reflected by the reflecting surface and then is emitted from the light emitting step, in the light path transmission process, the condition that the light overflows the lens exists on the reflecting surface, particularly when the mounting position of the light source deviates from the design position, the incident angle of the light at the reflecting surface changes, the problem of light overflow is further promoted, the light efficiency of the lens is further greatly reduced, the mounting precision requirement of the relative position of the light source and the lens in the mounting process is also increased, and great difficulty is brought to the assembly work.
Therefore, it is currently required to design a lens structure capable of ensuring good light efficiency and reducing the requirement of mounting accuracy.
Disclosure of Invention
The invention aims at: aiming at the problems of lower light efficiency and higher installation precision requirement of the existing lens structure, the lens structure capable of ensuring good light efficiency and reducing the installation precision requirement is provided.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
a lens, wherein an incident area and an emergent area are arranged on the lens, a reflecting area is formed on the outer side wall surface between the emergent area and the incident area, and the emergent area comprises a first emergent area and a second emergent area surrounding the first emergent area;
the second exit area comprises a base surface and a plurality of convex units arranged on the base surface, the cross section shape of the base surface is gradually enlarged in the direction from the small end to the large end on the plane perpendicular to the optical axis of the lens,
the distance between the small end and the large end of the base surface is H1 in the direction along the optical axis of the lens, D1 in the direction perpendicular to the optical axis of the lens, D1/H1 is more than or equal to 3 and more than or equal to 1.1, and the protruding unit is arranged around the optical axis of the lens.
When the lens is used, a light source is matched with an incident area, light rays emitted by the light source are refracted by the incident area and enter the lens, part of the light rays are refracted by the first emergent area and are reflected by the incident area to the reflecting area, then are reflected by the reflecting area to the second emergent area, the lens is refracted by the second emergent area, the light rays refracted by the first emergent area form a first light spot unit at a designed illumination position, the light rays refracted by the second emergent area form a second light spot unit at the designed illumination position, and the first light spot unit is matched with the second light spot unit to obtain an illumination light spot with a designed shape;
In the scheme of the application, the matching mode of the first light spot unit and the second light spot unit can be overlapped, partially overlapped or spliced;
further, when the lens is designed, to form an illumination spot meeting the design requirement, the structural parameters of the reflection area will also change when the structural parameters of the exit area are adjusted, specifically to the lens structure according to the application, namely: the parameter of the second emergent region is adjusted, the structural parameter of the reflecting region is also required to be adjusted, and the parameter variation of the reflecting region is directly related to the light overflow quantity, so in the application, the parameter of the second emergent region is set to be 3 more than or equal to D1/H1 more than or equal to 1.1, the reflecting region is made to form a corresponding parameter structure in the parameter, and the structural parameter formed by the reflecting region can greatly reduce the light overflowed from the reflecting region, so when the second emergent region is controlled in the parameter, the lens can have better light efficiency;
furthermore, in the lens of the present application, the convex units are further disposed in the second exit area, and due to the disposition of the convex units, the surface of the convex units is used as an optical surface, compared with the light surface, the light control capability of the second exit area is greatly improved, and the light control capability of the second exit area is further improved, that is, compared with the lens in which the convex units are not disposed in the exit area, the variable quantity of the parameters of the reflection area is further increased, that is, when the same illumination spot is formed, the lens in which the convex units are disposed in the exit area is disposed, the adjustable quantity of the reflection area is wider, and when the parameter selection of the reflection area is performed, the parameter with as few overflowed light can be selected, thereby further reducing the light overflow quantity and further improving the light efficiency of the lens; moreover, due to the arrangement of the protruding units, the uniformity of the illumination light spots can be further improved, and when the positions between the lens and the light source are changed slightly, the illumination light spots still have good uniformity, so that the requirement on the installation accuracy of the light source and the lens is reduced.
Preferably, on a plane coplanar with the optical axis of the lens, the light rays refracted by the convex units are at least partially crossed before forming the illumination spot.
In the lens with the traditional structure, after each light beam is refracted out of the lens by the emergent surface, the light beams do not intersect before reaching an illumination spot, then the light beams irradiate at the corresponding positions according to the designed light paths, when the position of the light source changes, the incident angle reflection of each light beam changes, the light beams refracted out of the lens deflect, and the local position of the area to be illuminated is caused to generate dark areas, namely the condition of uneven spots, so that the installation position precision of the light source in the traditional lamp structure is required to be higher;
therefore, in the application, due to the arrangement of the convex units, at least a part of light rays positioned on the plane passing through the optical axis of the lens cross after passing through the convex units, namely, part of light rays are in a crossed state in the light rays forming the light spots, so when the relative positions of the light source and the lens change slightly, the refraction angle of the light rays changes, but for the light rays which cross, the change of the refraction angle only affects the edges of the light spots to a certain extent, namely, only affects the shape of the light spots and does not form local dark areas inside the light spots, so that the light spots with higher uniformity can still be formed, the requirement on the installation precision of the lens and the light source is greatly reduced, and the installation cost is reduced.
Preferably, on a plane coplanar with the optical axis of the lens, the light rays which lie in this plane and are refracted out by the single convex unit, before the illumination spot is formed, at least a part of the light rays intersect. In the scheme of the application, the arrangement is such that the light rays refracted by the single convex unit are intersected, so that the sufficiency of light ray intersection is greatly improved, and on the one hand, the method comprises the following steps: when the position between the lens and the light source is changed, the uniformity of the light spots is further ensured; the design difficulty of the reflection area is further reduced, and the parameter of the reflection area is designed to be as high as possible without overflowing light.
Preferably, the convex unit is further provided with a plurality of micro optical surfaces. In the present application, the minute optical surface is an optical unit capable of adjusting light, and these optical units may be curved surfaces which are convex, or minute plane units, and the sufficiency of light crossing is further improved by providing the minute optical surface on the convex unit.
Preferably, in a plane coplanar with the optical axis of the lens, when there are a plurality of cross-sectional elements in a single convex element, the light rays which are located in the plane and are refracted by the single cross-sectional element intersect at least a portion of the light rays before forming the illumination spot.
In the application, when the protrusions are annular or spiral or have other irregular shapes, the protrusions with multiple cross-section units, for example, when the protrusions are annular, are provided with two opposite cross-section units, and the light rays emitted by the same cross-section unit are intersected, so that the sufficiency of light ray intersection is further improved.
In the present application, the above-described intersection of light rays is the intersection of light rays before forming the designed illumination spot.
Preferably, the convex unit has a ring shape surrounding around the optical axis of the lens. In the application, the convex units are arranged in a ring shape, so that the intersection of light rays exists on any plane passing through the optical axis of the lens in the ring direction, and the uniformity of the illumination light spots in the ring direction is ensured.
Preferably, the protruding units are uniformly arranged along the base surface. So arranged, uniformity in the radial direction of the illumination spot is ensured.
Preferably, adjacent convex units are spliced. The light rays irradiated on the area are refracted out of the lens through the convex units, so that the uniformity of the illumination light spots is further improved; compared with the lens structure of the comparison document 1, in the step-shaped emergent area of the comparison document 1, a certain inclination angle is necessarily required to exist in the step for drawing the area of the die, the light beam of the light source irradiates on the cut inclined surface, is distributed in the illumination area after being refracted out of the lens to form stray light, and the intensity of the part of stray light depends on the size of the inclined surface and the size of the inclination angle, so that the uniformity of light spots can be greatly reduced; in the application, the protruding units are spliced, so that the problem that light beams between adjacent protruding units form stray light is avoided, and the uniformity of illumination light spots is greatly improved.
Preferably, 2.5 is greater than or equal to D1/H1 is greater than or equal to 1.5. When the ratio of D1/H1 is more than or equal to 2.5 and more than or equal to 1.5, the reflection area is enabled to form corresponding structural parameters, and the light overflowed from the reflection area is further sharply reduced during the structural parameters, so that the light efficiency of the lens can be greatly improved.
Preferably, d1/h1=1.9±0.1. When the second emergent area is the parameter, a better parameter can be formed in the corresponding reflecting area, and when the reflecting area is the parameter, the light overflow amount is a minimum value, so that the light efficiency of the lens is greatly improved.
Preferably, the basal plane of the second emergent region is concave towards the inside of the lens, the included angle between the tangent line of the basal plane and the plane perpendicular to the optical axis of the lens is alpha, and the alpha gradually increases in the direction from the small end to the large end. And the basal plane of the second emergent region is concave towards the inside of the lens, and when alpha is gradually increased, the light rays emitted by the light source are converged.
Preferably, the included angle between the tangent at the small end of the basal plane and the plane perpendicular to the optical axis of the lens is alpha 1, and the included angle between the tangent at the large end of the basal plane and the plane perpendicular to the optical axis of the lens is alpha 2, and alpha 1 is more than or equal to 0 and less than or equal to 35 degrees; alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees. When the above parameters are adopted by the base surface, the control of the parameters of the reflection area can be further facilitated while the light is converged, so that the light overflowed from the reflection area is reduced as much as possible.
Preferably, α1=18° ±1°, α2=35° ±1°. When the second emergent area is the parameter, a better parameter can be formed in the corresponding reflecting area, and when the reflecting area is the parameter, the light overflow amount is a minimum value, so that the light efficiency of the lens is greatly improved.
Preferably, the protruding units are distributed over the second exit area. Further improves the cross sufficiency of the light rays after exiting the lens, and further expands the allowable displacement range of the relative positions between the lens and the lamp.
Preferably, the reflecting area has a large end and a small end, the cross-sectional shape of the reflecting area is gradually enlarged in the direction from the small end to the large end on a plane perpendicular to the optical axis of the lens, the distance between the small end and the large end of the reflecting area is H2 in the direction along the optical axis of the lens, D2 is equal to or more than 2 and D2/H2 is equal to or more than 0.5 in the direction perpendicular to the optical axis of the lens. When the second emergent region adopts the structural parameters, the structural parameters corresponding to the reflecting region are optimized in the parameter range, so that the parameters of the reflecting region are more than or equal to 2D 2/H2 more than or equal to 0.5, and the light overflowing from the reflecting region can be reduced as much as possible in the range, so that the light efficiency of the lens is further improved.
Further preferably, d2/h2=0.52±0.05. When the reflection area adopts the parameter, the light overflowed from the reflection area is very little, and the light efficiency of the lens is greatly improved.
Further preferably, the reflecting area protrudes in a direction away from the lens, and an angle between a tangent line of the reflecting area and a plane perpendicular to the optical axis of the lens is β, and β gradually increases in a direction from the small end to the large end.
Further preferably, the included angle between the tangent at the small end of the reflecting area and the plane perpendicular to the optical axis of the lens is beta 1, the included angle between the tangent at the large end of the emergent area and the plane perpendicular to the optical axis of the lens is beta 2, 20-55 degrees, 20-75 degrees. When the reflection area adopts the above-described parameters and defines β1 and β2 as the above-described values, the amount of overflowing light can be further reduced.
Further preferably β1=48° ±1°, β2=71° ±1°. When the reflection area adopts the parameter, the light overflowed from the reflection area is very little, and the light efficiency of the lens is greatly improved.
Preferably, the reflection area is an optical surface formed by splicing a plurality of optical units, or is a continuous smooth curved surface, or is a combination of the two. By arranging a plurality of optical units, the light control capability of the reflection area is greatly improved, and the uniformity of the illumination light spots is further improved while the light overflow is further reduced.
Preferably, the incident area includes a first incident area opposite to the first emergent area and a second incident area opposite to the reflecting area, the second incident area surrounds the first incident area, the second incident area has a large end and a small end, the cross-sectional shape of the second incident area is gradually enlarged in a direction from the small end to the large end on a plane perpendicular to the optical axis of the lens, and the small end of the second incident area is connected with the edge of the first incident area. When the light source is matched, the light of the light source is divided into small-angle light and large-angle light positioned outside the small-angle light according to the size of an included angle with an optical axis, the small-angle light corresponds to a first incidence area, the large-angle light corresponds to a second incidence area, so that the small-angle light and the large-angle light are respectively controlled, the light control capability of the lens is further improved, further, in the application, after the large-angle light is reflected by a reflection area, all or part of the large-angle light is refracted by a convex unit, part of the small-angle light is refracted by a first emergent area, and the large-angle light is taken as a cross beam, on one hand, the large-angle light is distributed on the periphery of an illumination spot, the shape of the illumination spot is convenient to control, and when the light source is shifted, the emergent angle is changed along with the second emergent area, and the shape of the illumination spot can be adjusted.
Preferably, the distance between the small end and the large end of the second incident area is H3 in the direction along the optical axis of the lens, and D3 in the direction perpendicular to the optical axis of the lens, wherein D3/H3 is more than or equal to 0 and less than or equal to 0.2. When the second incidence area adopts the parameter, the light overflow quantity of the reflection area can be further reduced.
Further preferably, d3/h3=0.05±0.005. When the second incidence area adopts the parameter, the light overflowed from the reflection area is very little, and the light efficiency of the lens is greatly improved.
Preferably, the included angle between the tangent line of the end part of the second incidence area far away from the first incidence area and the plane of the optical axis of the lens is gamma 1, and gamma 1 is more than or equal to 0 and less than or equal to 10 degrees; the angle between the tangent line near the end of the first incidence area and the plane of the optical axis of the lens is gamma 2, and gamma 2 is more than or equal to 0 degree and less than or equal to 10 degrees.
Further preferably γ1=3° ±0.3°, γ2=3° ±0.3°.
When the second emergent area, the reflecting area and the second incident area are respectively the above-defined structural parameters, compared with the traditional lens structure, the lens can greatly reduce the overflowing light quantity while realizing good light spot uniformity, further greatly improve the light efficiency of the lens, simultaneously reduce the precision requirement of the relative positions of the light source and the lens, facilitate the installation and reduce the installation cost, and can control the beam angle by adjusting the relative positions of the light source and the lens, further control the shape of the illumination light spot.
Preferably, the first exit region is a convex surface that is convex away from the lens. The light energy density of the light rays with small angles is high, and the convex surface is adopted to disperse the light rays, so that the light rays are beneficial to being matched with the crossed light rays which are refracted out by the convex units to form uniform light spots.
Preferably, the first exit area is an optical surface formed by splicing a plurality of optical units.
Preferably, the incident area is a fresnel optical surface.
Preferably, the incident area corresponds to a light source installation area, and when the light source is at any position in the installation area, the light rays refracted by the emergent area form illumination spots with uniform light energy distribution at the designed illumination position.
In the application, part of light rays forming the illumination light spots are in a crossed state, so when the relative position between the lens and the light source is changed, and when the change value is controlled in a certain area, good uniformity can be ensured after the shape of the illumination light spots is changed.
Preferably, the light source mounting region is a region axially displaced along the optical axis of the lens. That is, the illumination spot shape changes as the light source moves along a certain section of the optical axis of the lens, and during this change, the illumination spot ensures good uniformity.
Preferably, intersecting lines are formed between the protruding units and the base surface, the width between the intersecting lines of the single protruding units is D4, the protruding height of the protruding units relative to the base surface is H4, D4/H4 is less than or equal to 4 and less than or equal to 40, and D1/D4 is less than or equal to 4. When the D4/H4 and D1/D4 of the convex units are in the above ranges, the second emergent area has good light homogenizing effect and light control capability.
Further preferably, d4/h4=10±0.1, d1/d4=36±0.1.
The application also discloses a lamp, which comprises the lens and a light source matched with the lens.
The lamp provided by the application adopts the lens, so that on one hand, the light overflowing from the lens is greatly reduced, the light efficiency is greatly improved, and on the other hand, the assembly precision between the light source and the lens can be reduced, and further, the assembly cost and the assembly time are reduced.
Preferably, the lens has a light source mounting area, and when the light source is at any position in the mounting area, the light rays refracted by the emergent area form an illumination spot with uniform light energy distribution at the designed illumination position. By the arrangement, the lamp can obtain illumination light spots with different beam angles by adjusting the relative positions of the lens and the light source, so that the applicability of the lamp is improved.
The application also discloses a lens design method which comprises the following steps:
firstly, determining the light emergent caliber and the beam angle value of a lens according to the design requirement of a target illumination spot;
secondly, D1 and H1 of the second emergent area are controlled within the range of 3-1/H1-1;
thirdly, on the premise that the light emitted from the lens emergent region meets the light beam angle requirement in the first step, adjusting the structural parameters of the reflecting region, and simulating the light overflow amount in the parameter adjusting process of the reflecting region;
and (IV) selecting the corresponding structural parameters when the light overflow quantity is the minimum value as the structural parameters of the reflection area according to the simulation result of the light overflow quantity of the reflection area in the step (III).
When the design method of the application is adopted, when the lens is designed, an illumination light spot meeting the design requirement is formed, and when the structural parameters of the emergent area are adjusted, the structural parameters of the reflecting area are also changed, and the lens structure specifically comprises the following components: the parameter of the second emergent region is adjusted, the structural parameter of the reflecting region is also required to be adjusted, and the parameter variation of the reflecting region is directly related to the light overflow quantity, so in the application, the parameter of the second emergent region is set to be 3 more than or equal to D1/H1 more than or equal to 1.1, the reflecting region is made to form a corresponding parameter structure in the parameter, and the structural parameter formed by the reflecting region can greatly reduce the light overflowed from the reflecting region, so when the second emergent region is controlled in the parameter, the lens can have better light efficiency.
Preferably, in the step (ii), α1 and α2 of the second exit region are controlled within the following parameters: alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees; alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees. When the second emission area is limited to the parameter value, the light overflow amount of the reflection area can be further reduced, and the light efficiency of the lens can be further improved.
In summary, due to the adoption of the technical scheme, the beneficial effects of the application are as follows:
the lens can ensure good light effect and reduce the lens structure required by mounting precision;
the lamp provided by the application can ensure good light efficiency, and can obtain illumination light spots with different beam angles by adjusting the relative positions between the lens and the light source, so that the applicability of the lamp is improved;
the lens design method can greatly improve the light efficiency of the lens.
Drawings
FIG. 1 is a schematic view of a collimating LED lens and a collimating LED lamp in the prior art,
figure 2 is a schematic view of the optical path of the lens of figure 1,
the labels in figures 1 and 2: 20-LED lamp, 30-lens body, 31-incident groove, 32-first incident surface, 33-second incident surface, 34-first emergent surface, 35-reflection step, 36-reflection surface, 37-light-emitting step,
Figure 3 is a lens structure without protruding elements in the second exit area,
FIG. 4 is a graph showing the illuminance profile at an illumination spot when the lens of FIG. 3 is used and the light source is displaced;
FIG. 5 is a schematic view of a lens structure according to the present application;
FIG. 6 is a graph showing the illuminance profile at an illumination spot when there is displacement of the light source using the lens structure of the present application;
FIG. 7 is a schematic view of a light path of a partial position of a second exit region of the lens structure of the present application;
FIG. 8 is an enlarged view of a portion of FIG. 7 at E;
FIG. 9 is a simplified schematic illustration of the intersection of optical paths on a single cross-section cell of FIG. 8;
FIG. 10 is a schematic view showing a partial structure of a lens when a micro optical surface is provided on a convex unit;
FIG. 11 is a schematic representation of labeling of the α, β and γ parameters in the lens structure of the present application;
FIG. 12 is a schematic representation of labeling of H and D parameters in a lens structure according to the present application;
FIG. 13 is a simplified schematic diagram of the optical path of the lens with the light sources in positions A1, A2 and A3, respectively;
FIG. 14 is a schematic view of light ray spillover when there are more spillover rays from the reflective area of the lens;
FIG. 15 is a schematic view of light spillover with less spillover of the reflective area of the lens;
figure 16 is a schematic representation of labeling of the lobe unit parameters,
the marks in the figure: 1-lens, 2-first emergent area, 3-second emergent area, 4-reflecting area, 5-first incident area, 6-second incident area, 7-protruding unit, 8-section unit, 9-micro optical surface, A-optical axis, B-base plane, C-light source.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The specific embodiment is as follows:
a lens, as shown in figures 5,7-13,
an incident area and an emergent area are arranged on the lens 1, a reflecting area 4 is formed on the outer side wall surface between the emergent area and the incident area, and the emergent area comprises a first emergent area 2 and a second emergent area 3 surrounding the first emergent area 2;
the second emergent area 3 comprises a base surface B and a plurality of protruding units 7 arranged on the base surface B, the base surface B is provided with a large end and a small end, the cross section shape of the base surface B is gradually enlarged in the direction from the small end to the large end on the plane vertical to the optical axis A of the lens 1, the distance between the small end and the large end of the base surface B is H1 in the direction along the optical axis A of the lens 1, D1 is more than or equal to 3 and more than or equal to D1/H1 is more than or equal to 1.1 in the direction vertical to the optical axis A of the lens 1, and the protruding units 7 are arranged around the optical axis A of the lens 1.
When the lens 1 of the embodiment is used, the light source C is matched with the incident area, light rays emitted by the light source C are refracted by the incident area and enter the lens 1, wherein part of the light rays are refracted by the first emergent area 2 and enter the lens 1, part of the light rays are refracted by the incident area and enter the reflecting area 4, then are reflected by the reflecting area 4 to the second emergent area 3, the lens 1 is refracted by the second emergent area 3, the light rays refracted by the first emergent area 2 form a first light spot unit at a designed illumination position, the light rays refracted by the second emergent area 3 form a second light spot unit at the designed illumination position, and the first light spot unit is matched with the second light spot unit to obtain an illumination light spot with a designed shape;
in the scheme of the embodiment, the matching mode of the first light spot unit and the second light spot unit can be overlapped, partially overlapped or spliced;
further, in order to form an illumination spot satisfying the design requirement when designing the lens 1, the structural parameters of the reflection area 4 are also changed when the structural parameters of the emission area are adjusted, and specifically, the lens 1 structure according to the present embodiment is: the parameters of the second emitting area 3 are adjusted, the structural parameters of the reflecting area 4 need to be adjusted accordingly, and the parameter variation of the reflecting area 4 is directly related to the light overflow quantity, as shown in fig. 14 and 15, so in the present embodiment, the parameters of the second emitting area 3 are set to be 3 not less than D1/H1 not less than 1.1, as shown in fig. 15, in the parameters, the reflecting area 4 forms a corresponding parameter structure, and the structure formed by the reflecting area 4 can greatly reduce the light overflowed by the reflecting area 4, so when the second emitting area 3 is controlled within the parameters, the lens 1 can have better light efficiency; moreover, due to the arrangement of the protruding unit 7, the uniformity of the illumination light spot can be further improved, and when the position between the lens 1 and the light source C is slightly changed, the illumination light spot still can have good uniformity, so that the requirement on the installation precision of the light source C and the lens 1 is also reduced.
As a preferred embodiment, on the basis of the above structure, further, on the plane coplanar with the optical axis a of the lens 1, the light rays which are located in the plane and are refracted by the convex unit 7, before forming the illumination spot, at least a part of the light rays intersect, as shown in fig. 7, 8 and 9.
In the lens 1 with the traditional structure, after each light beam is refracted out of the lens 1 by an emergent surface, the light beams do not intersect before reaching an illumination light spot, then the light beams are irradiated at the corresponding positions according to a designed light path, when the position of a light source C changes, the incident angle reflection of each light beam changes, the light beam refracted out of the lens 1 deflects, so that a dark area appears at the local position of an area to be illuminated, namely the condition of uneven light spots is caused, and therefore, in the current lamp structure, the installation position accuracy requirement of the light source C is higher;
therefore, in the present application, due to the arrangement of the convex unit 7, at least a part of the light rays located on the plane passing through the optical axis a of the lens 1 after passing through the convex unit 7 cross, as shown in fig. 7 and 8, that is, the light rays forming the light spots are in a crossed state, so when the relative positions of the light source C and the lens 1 are changed slightly, although the refraction angle of the light rays also changes, for the crossed light rays, the change of the refraction angle only affects the edges of the light spots, that is, only affects the shape of the light spots, and does not form local dark areas inside the light spots, so that the light spots with high uniformity can still be formed, as shown in fig. 6, thus greatly reducing the requirement of the installation precision of the lens 1 and the light source C and reducing the installation cost.
As a preferred embodiment, on the basis of the above-described structure, further, as shown in fig. 8 and 9, on a plane coplanar with the optical axis a of the lens 1, light rays which are located in the plane and are refracted through the single convex unit 7 intersect at least a portion of the light rays before forming the illumination spot. In the solution of the present application, the arrangement is such that the light rays refracted by the single convex unit 7 intersect, so that the sufficiency of the intersection of the light rays is greatly improved, and thus, on the one hand: when the position between the lens 1 and the light source C changes, the uniformity of the light spots is further ensured; the design difficulty of the reflection area 4 is further reduced, and the parameter of the reflection area 4 is designed to avoid overflowing light as far as possible.
As a preferred embodiment, in addition to the above structure, as shown in fig. 10, the protrusion unit 7 is further provided with a plurality of micro optical surfaces 9. In the present application, the minute optical surface 9 is an optical unit capable of adjusting light, and these optical units may be curved surfaces that are convex, or minute plane units, and the sufficiency of light crossing is further improved by providing the minute optical surface 9 on the convex unit 7.
As a preferred embodiment, further, on the basis of the above structure, as shown in fig. 8 and 9, on a plane coplanar with the optical axis a of the lens 1, when a single convex unit 7 has a plurality of cross-section units 8, the light rays are located in the plane, and the light rays refracted through the single cross-section units 8 intersect at least a part of the light rays before forming the illumination spot. In the present embodiment, when the protrusions are annular, spiral or some other irregular shape, the protrusions having a plurality of cross-section units 8, for example, when the protrusion units 7 are annular, are formed on the cross-section of the lens 1, and in the present embodiment, the light rays emitted from the same cross-section unit 8 intersect with each other, so that the sufficiency of light ray intersection is further improved.
In this embodiment, the light rays intersect before forming the designed illumination spot.
Further, the convex unit 7 has a ring shape surrounding the optical axis a of the lens 1. In the present embodiment, the convex unit 7 is provided in a ring shape such that there is a crossing of the light rays on any plane passing through the optical axis a of the lens 1 in the circumferential direction, ensuring uniformity in the circumferential direction of the illumination spot.
Further, the protruding units 7 are uniformly arranged along the base surface B. So arranged, uniformity in the radial direction of the illumination spot is ensured.
Further, adjacent convex units 7 are spliced. The light rays irradiated on the area are refracted out of the lens 1 through the convex units 7, so that the uniformity of the illumination light spots is further improved.
Further preferably, 2.5.gtoreq.D1/H1.gtoreq.1.5. When 2.5 is greater than or equal to D1/H1 is greater than or equal to 1.5, the reflecting area 4 is enabled to form corresponding structural parameters, and light overflowed from the reflecting area 4 is further sharply reduced during the structural parameters, so that the light efficiency of the lens 1 can be greatly improved.
Further preferably, d1/h1=1.9. When the second exit area 3 is the parameter, a better parameter can be formed in the corresponding reflection area 4, and when the reflection area 4 is the parameter, the light overflow amount is a minimum value, so that the light efficiency of the lens 1 is greatly improved.
As a preferred embodiment, based on the above structure, further, the base surface B of the second exit area 3 is recessed toward the inside of the lens 1, and the angle α between the tangent line of the base surface B and the plane perpendicular to the optical axis a of the lens 1 is α, and α gradually increases in the direction from the small end to the large end. The basal plane B of the second exit area 3 is concave towards the inside of the lens 1, and when alpha is gradually increased, the light emitted by the light source C is converged.
Further preferably, the included angle between the tangent at the small end of the basal plane B and the plane perpendicular to the optical axis A of the lens 1 is alpha 1, and the included angle between the tangent at the large end of the basal plane B and the plane perpendicular to the optical axis A of the lens 1 is alpha 2, and alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees; alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees. When the above parameters are adopted for the base surface B, the control of the parameters of the reflection area 4 can be further facilitated while the light can be converged, so that the amount of the light overflowing from the reflection area 4 is reduced as much as possible.
Further preferably, the protruding elements 7 are distributed over the second exit area 3. Further improves the cross sufficiency of the light rays after exiting the lens 1, and further expands the allowable displacement range of the relative positions between the lens 1 and the lamp.
In a preferred embodiment, based on the above structure, the reflecting area 4 has a large end and a small end, the cross-sectional shape of the reflecting area 4 is gradually enlarged in the direction from the small end to the large end on the plane perpendicular to the optical axis a of the lens 1, the distance between the small end and the large end of the reflecting area 4 is H2 in the direction along the optical axis a of the lens 1, and D2 is equal to or greater than D2/H2 is equal to or greater than 0.5 in the direction perpendicular to the optical axis a of the lens 1. When the second exit area 3 adopts the above structural parameters, the structural parameters of the reflective area 4 are corresponding, and are optimized within the parameter range, so that the parameters of the reflective area 4 are 2 more than or equal to D2/H2 more than or equal to 0.5, and in the range, the light overflowed from the reflective area 4 can be reduced as much as possible, and the light efficiency of the lens 1 is further improved.
Further preferably, D2/h2=0.52. When the reflection area 4 adopts this parameter, the light overflowing from the reflection area 4 is extremely small, and the light efficiency of the lens 1 is greatly improved.
It is further preferred that the reflective area 4 protrudes away from the lens 1, and that the angle between the tangent to the reflective area 4 and the plane perpendicular to the optical axis a of the lens 1 is β, which increases gradually in the direction from the small end to the large end.
As a preferred embodiment, based on the above structure, further, the angle between the tangent at the small end of the reflecting area 4 and the plane perpendicular to the optical axis a of the lens 1 is β1, the angle between the tangent at the large end of the emitting area and the plane perpendicular to the optical axis a of the lens 1 is β2, 20.ltoreq.β1.ltoreq.55 °, 20.ltoreq.β2.ltoreq.75 °. When the reflection area 4 adopts the above-described parameters and defines β1 and β2 as the above-described values, the amount of overflowing light can be further reduced.
Further preferably, β1=48°, β2=71°. When the reflection area 4 adopts this parameter, the light overflowing from the reflection area 4 is extremely small, and the light efficiency of the lens 1 is greatly improved.
As a preferred embodiment, based on the above structure, the reflection area 4 is an optical surface formed by splicing a plurality of optical units, or is a continuous smooth curved surface, or is a combination of the two. By arranging a plurality of optical units, the light control capability of the reflecting area 4 is greatly improved, and the uniformity of the illumination light spots is further improved while the overflow of light is further reduced.
As a preferred embodiment, based on the above structure, the incident area includes a first incident area 5 opposite to the first exit area 2 and a second incident area 6 opposite to the reflecting area 4, the second incident area 6 surrounds the first incident area 5, the second incident area 6 has a large end and a small end, the cross-sectional shape of the base surface B is gradually enlarged in a direction from the small end to the large end on a plane perpendicular to the optical axis a of the lens 1, and the small end of the second incident area 6 meets the edge of the first incident area 5. When the light source C is matched, the light of the light source C is divided into a small-angle light and a large-angle light located outside the small-angle light according to the included angle with the optical axis a, the small-angle light corresponds to the first incident area 5, the large-angle light corresponds to the second incident area 6, so that the small-angle light and the large-angle light are respectively controlled, the light control capability of the lens 1 is further improved, further, in the embodiment, all or part of the large-angle light is refracted by the convex unit 7 after being reflected by the reflecting area 4, part of the small-angle light is refracted by the first emergent area 2, and the large-angle light is used as a cross beam, on one hand, the large-angle light is distributed on the periphery of an illumination spot, so that the shape of the illumination spot is convenient to control, and when the light source C is shifted, the emergent angle is changed after being refracted by the second emergent area 3, and the shape of the illumination spot can be adjusted.
Further preferably, D3/h3=0.05. When this parameter is used for the second incidence area 6, the light escaping from the reflection area 4 is very small, and the light efficiency of the lens 1 is greatly improved.
Further preferably, the angle between the tangent of the end of the second incidence area 6 far from the first incidence area 5 and the plane of the optical axis A of the lens 1 is gamma 1, and gamma 1 is more than or equal to 0 and less than or equal to 10 degrees; the angle between the tangent line near the end of the first incidence area 5 and the plane of the optical axis A of the lens 1 is gamma 2, and gamma 2 is more than or equal to 0 DEG and less than or equal to 10 deg.
Further preferably, γ1=3°, γ2=3°.
When the second exit area 3, the reflection area 4 and the second incident area 6 are respectively the above-defined structural parameters, compared with the conventional lens 1 structure, the lens 1 of the embodiment can greatly reduce the amount of overflowed light while achieving good spot uniformity, thereby greatly improving the light efficiency of the lens 1, simultaneously reducing the precision requirement of the relative positions of the light source C and the lens 1, facilitating the installation and reducing the installation cost, and controlling the beam angle by adjusting the relative positions of the light source C and the lens 1, thereby further controlling the shape of the illumination spot.
As a preferred embodiment, in addition to the above structure, the first emission region 2 is a convex surface that is convex away from the lens 1. The light energy density of the light rays with small angles is high, and the convex surface is adopted to disperse the light rays, so that the light rays are beneficial to being matched with the crossed light rays which are refracted out by the convex units 7 to form uniform light spots.
Further preferably, the first exit area 2 is an optical surface formed by splicing a plurality of optical units.
Further preferably, the incident area is a fresnel optical surface.
Further preferably, the incident area corresponds to a mounting area of the light source C, and when the light source C is at any position in the mounting area, the light rays refracted by the emergent area form an illumination spot with uniform light energy distribution at the designed illumination position.
In the present embodiment, since part of the light rays forming the illumination spot are in the intersecting state, when the relative position between the lens 1 and the light source C is changed, and when the change value is controlled in a certain area, good uniformity can be ensured after the illumination spot shape is changed, so that the lens 1 of the present embodiment is adopted, and the light source C can be moved in the mounting area while achieving good spot uniformity, and the spot shape can be adjusted, so that the applicability of the present embodiment is also improved.
As a preferred embodiment, in addition to the above configuration, the light source C mounting area is an area axially displaced along the optical axis a of the lens 1. That is, the light source C changes the shape of the illumination spot as it moves along a certain section of the optical axis a of the lens 1, and during this change, the illumination spot ensures good uniformity; as shown in fig. 15, the light path diagram of the light source C at three different positions on the optical axis a of the lens 1 is shown; since the light source C changes the relative position between the lenses 1 in this area, the illumination spot of the lenses 1 still has good uniformity, and only changes the shape of the spot, the lens 1 of the present application also has a focusing effect, i.e. the size of the spot, i.e. the beam angle, is controlled by adjusting the desired position between the light source C and the lenses 1.
As a preferred embodiment, further, as shown in fig. 16, an intersection line is formed between the protruding unit 7 and the base surface B, the width between the intersection lines of the single protruding unit 7 is D4, and the protruding height of the protruding unit relative to the base surface B is H4, 4.ltoreq.d4/H4.ltoreq.40, and 4.ltoreq.d1/D4. When the D4/H4 and D1/D4 of the convex unit 7 employ the above ranges, the second exit area 3 has a good dodging effect and light control capability.
Further preferably, d4/h4=10, d1/d4=36.
The embodiment also discloses a lamp which comprises a lamp body,
comprising the lens 1 described above and a light source C associated with said lens 1.
The lamp of the embodiment adopts the lens 1, so that on one hand, light overflowed from the lens 1 is greatly reduced, the light efficiency is greatly improved, and on the other hand, the assembly precision between the light source C and the lens 1 can be reduced, and further, the assembly cost and the assembly time are reduced.
As a preferred embodiment, on the basis of the above structure, the lens 1 further has a light source C mounting area, and when the light source C is at any position in the mounting area, the light rays refracted by the exit area form an illumination spot with uniform light energy distribution at the designed illumination position. By means of the arrangement, the lamp of the embodiment can obtain illumination light spots with different beam angles by adjusting the relative positions between the lens 1 and the light source C, and the lamp of the application has focusing capability, namely, as shown in fig. 15, the size of the light spots is controlled by adjusting the wanted position between the light source C and the lens 1, namely, the beam angle is controlled, so that the applicability of the lamp is greatly improved.
The present embodiment also discloses a lens 1 design method:
firstly, determining the light emergent caliber and the beam angle value of the lens 1 according to the design requirement of a target illumination spot;
secondly, D1 and H1 of the second emergent area 3 are controlled within the range of 3 to be more than or equal to D1/H1 to be more than or equal to 1.1;
thirdly, on the premise that the light emitted from the emergent area of the lens 1 meets the light beam angle requirement in the step (one), adjusting the structural parameters of the reflecting area 4, and simulating the light overflow amount in the parameter adjusting process of the reflecting area 4;
and (IV) selecting the corresponding structural parameters when the light overflow quantity is the minimum value as the structural parameters of the reflection area 4 according to the simulation result of the light overflow quantity of the reflection area 4 in the step (III).
When the design method of the application is adopted, when the lens 1 is designed, an illumination spot meeting the design requirement is formed, and when the structural parameters of the emergent area are adjusted, the structural parameters of the reflecting area 4 are also changed, and the structure of the lens 1 specifically relates to the application, namely: the parameters of the second emergent region 3 are adjusted, the structural parameters of the reflecting region 4 are also required to be adjusted, and the parameter variation of the reflecting region 4 is directly related to the light overflow quantity, so in the application, the parameters of the second emergent region 3 are set to be 3 more than or equal to D1/H1 more than or equal to 1.1, the reflecting region 4 forms a corresponding parameter structure in the parameters, and the structural parameters formed by the reflecting region 4 can greatly reduce the light overflowed by the reflecting region 4, so when the second emergent region 3 is controlled in the parameters, the lens 1 can have better light efficiency.
Further preferably, in said step (two), α1 and α2 of the second exit area 3 are controlled within the following parameters: alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees; alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees. When the second emission region 3 is defined at the parameter value, the amount of light beam emitted from the reflection region 4 can be further reduced, and the light efficiency of the lens 1 can be further improved.
Experimental example:
(1) When the parameter of the second exit area 3 takes the value: 3. more than or equal to D1/H1 is more than or equal to 1.1, and the value is taken as an example by taking 36-degree beam angle of light refracted out by the emergent area of the lens 1 as the design target of the lens 1: when alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees and alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees,
the parameters corresponding to the inverse region of lens 1 are: 2. more than or equal to D2/H2 more than or equal to 0.5, more than or equal to 20 degrees and less than or equal to 55 degrees, more than or equal to 20 degrees and less than or equal to 75 degrees;
the parameters corresponding to the second incidence area 6 of the lens 1 are: D3/H3 is more than or equal to 0 and less than or equal to 0.2, gamma 1 is more than or equal to 0 and less than or equal to 10 degrees, and gamma 2 is more than or equal to 0 and less than or equal to 10 degrees.
For the lens 1 structure with the above parameters, a light source C is arranged at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100, and after interface reflection and material absorption are subtracted by adopting the lens 1 with the above parameters, the theoretical luminous flux of the emergent area is phi=70-95.
(2) When the parameter of the second exit area 3 takes the value: d1/h1=1.03, for the example of taking the beam angle of the light refracted by the exit area of the lens 1 as 36 ° as the design target of the lens 1, take the value: when alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees and alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees,
the parameters corresponding to the inverse region of lens 1 are: d2/h2=0.49, β1 is not less than 55 ° and not more than 60 °, β2 is not less than 75 ° and not more than 80 °;
the parameters corresponding to the second incidence area 6 of the lens 1 are: d3/h3=0.05, 0 degree is not less than γ1 is not more than 10 degrees, 0 degree is not less than γ2 is not more than 10 degrees.
For the lens 1 structure with the above parameters, a light source C is disposed at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100, and after the interface reflection and material absorption are subtracted, the theoretical luminous flux phi of the emergent area is: less than 70 as shown in fig. 14.
(3) When the parameter of the second exit area 3 takes the value: d1/h1=1.9, for the example of taking the beam angle of the light refracted by the exit area of the lens 1 as 36 ° as the design target of the lens 1, take the value: α1=18°, α2=35°,
the parameters corresponding to the inverse region of lens 1 are: d2/h2=0.52, β1=48°, β2=71°;
The parameters corresponding to the second incidence area 6 of the lens 1 are: d3/h3=0.05, γ1=3°, γ2=3°.
For the lens 1 structure with the above parameters, a light source C is disposed at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100, and after the interface reflection and material absorption are subtracted, the theoretical luminous flux phi of the emergent area is: 95 as shown in fig. 15.
(4) When the parameter of the second exit area 3 takes the value: d1/h1=3.5, for the example of taking the beam angle of the light refracted by the exit area of the lens 1 as 36 ° as the design target of the lens 1, take the value: when alpha 1 is more than or equal to 0 degree and less than or equal to 35 degrees and alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees,
the parameters corresponding to the inverse region of lens 1 are: d2/h2=2.5, β1 is more than or equal to 10 ° and less than or equal to 20 °, β2 is more than or equal to 10 ° and less than or equal to 20 °;
the parameters corresponding to the second incidence area 6 of the lens 1 are: d3/h3=0.05, 0 degree is not less than γ1 is not more than 10 degrees, 0 degree is not less than γ2 is not more than 10 degrees.
For the lens 1 structure with the above parameters, a light source C is disposed at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100, and after the interface reflection and material absorption are subtracted, the theoretical luminous flux phi of the emergent area is: less than 70.
(5) When the parameter of the second exit area 3 takes the value: 3. more than or equal to D1/H1 is more than or equal to 1.1, and the value is taken as an example by taking 36-degree beam angle of light refracted out by the emergent area of the lens 1 as the design target of the lens 1: when the angle alpha 1 is less than or equal to 35 degrees and the angle alpha 2 is less than or equal to 60 degrees,
the parameters corresponding to the inverse region of lens 1 are: the angle of 0.4 degrees is more than or equal to D2/H2 is more than or equal to 0.3 degrees, the angle of beta 1 is more than or equal to 55 degrees and less than or equal to 65 degrees, and the angle of beta 2 is more than or equal to 20 degrees and less than or equal to 75 degrees;
the parameters corresponding to the second incidence area 6 of the lens 1 are: D3/H3 is more than or equal to 0 and less than or equal to 0.05, gamma 1 is more than or equal to 0 and less than or equal to 10 degrees, and gamma 2 is more than or equal to 0 and less than or equal to 10 degrees.
For the lens 1 structure with the above parameters, a light source C is disposed at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100, and after the interface reflection and material absorption are subtracted, the theoretical luminous flux phi of the emergent area is: less than 65.
As can be seen from the comparison, in the structural design of the lens 1, the structural parameters of the formed reflection area 4 can be reduced as much as possible by controlling the second emergent area 3 within the range of 3 not less than D1/H1 not less than 1.1, so that the lens 1 has higher luminous efficacy, and further, the structural parameters of the reflection area 4 can be further limited by controlling the alpha 1 and the alpha 2 of the second emergent area 3 within the range of 0 degree not less than 35 degrees and 5 degrees not less than alpha 2 not more than 60 degrees.
The light beam angle of the light rays refracted by the emergent area of the lens 1 is taken as 36 DEG as a design target of the lens 1, a light source C is arranged at the incident area, the light emitting diameter of the light source C is Z, the optical emergent caliber of the lens 1 is X, Z/X=1/7.8, the luminous flux of the incident area entering the lens 1 is 100, the theoretical luminous flux phi of the emergent area after interface reflection and material absorption are subtracted, and the phi corresponding to different D1/H1 values is selected, wherein the following table is as follows:
as can be seen from the above table, when 3 is greater than or equal to D1/H1 is greater than or equal to 1.1, the phi value is excellent, so that the lens 1 has good light efficiency, when 2.5 is greater than or equal to D1/H1 is greater than or equal to 1.5, the phi value can reach a higher level, and when D1/H1=1.9, the phi value reaches 96, and at this time, the lens 1 has extremely excellent light efficiency.
The following steps are as follows: specific embodiment of the movement of the light source C within the installation area:
as shown in fig. 13, there are three positions on the illumination of the lens 1, A2 and A3, respectively:
(1) The values d1/h1=1.03, d2/h2=0.49, d3/h3=0.05, the optical exit aperture of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident region is 100,
after interface reflection and material absorption are subtracted, the theoretical luminous flux of the emergent area is phi by adopting the lens 1 with the parameter structure:
a: when the light source C is located at the A1 position: the beam angle is 15 °, phi=96;
b: when the light source C is located at the A2 position: the beam angle is 22 °, phi=85;
c: when the light source C is located at the A3 position: the beam angle is 36 °, phi=75.
(2) Taking the values d1/h1=1.5, d2/h2=0.5, d3/h3=0.05, the optical exit aperture of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100,
after interface reflection and material absorption are subtracted, the theoretical luminous flux of the emergent area is phi by adopting the lens 1 with the parameter structure:
a: when the light source C is located at the A1 position: the beam angle is 15 °, phi=97;
b: when the light source C is located at the A2 position: the beam angle is 22 °, phi=93;
c: when the light source C is located at the A3 position: the beam angle is 36 °, phi=90.
(3) Taking the values d1/h1=1.9, d2/h2=0.52, d3/h3=0.05, the optical exit aperture of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100,
after interface reflection and material absorption are subtracted, the theoretical luminous flux of the emergent area is phi by adopting the lens 1 with the parameter structure:
a: when the light source C is located at the A1 position: the beam angle is 15 °, phi=98;
b: when the light source C is located at the A2 position: the beam angle is 22 °, phi=96;
c: when the light source C is located at the A3 position: the beam angle is 36 °, phi=95.
(4) The values d1/h1=2.1, d2/h2=0.55, d3/h3=0.05, the optical exit aperture of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100,
after interface reflection and material absorption are subtracted, the theoretical luminous flux of the emergent area is phi by adopting the lens 1 with the parameter structure:
a: when the light source C is located at the A1 position: the beam angle is 15 °, phi=98;
b: when the light source C is located at the A2 position: the beam angle is 22 °, phi=96;
c: when the light source C is located at the A3 position: the beam angle is 36 °, phi=95.
(5) The values d1/h1=3.0, d2/h2=2, d3/h3=0.05, the optical exit aperture of the lens 1 is X, Z/x=1/7.8, and the luminous flux entering the lens 1 from the incident area is 100,
after interface reflection and material absorption are subtracted, the theoretical luminous flux of the emergent area is phi by adopting the lens 1 with the parameter structure:
a: when the light source C is located at the A1 position: the beam angle is 15 °, phi=85;
b: when the light source C is located at the A2 position: the beam angle is 22 °, phi=80;
c: when the light source C is located at the A3 position: the beam angle is 36 °, phi=65.
As can be seen from the above, when the lens 1 of the present application is adopted and the light source C moves in the installation area of the light source C, the adjustment of the beam angle is realized on the premise of ensuring the uniformity of the illumination light spot, and further the adjustment of the shape of the illumination light spot is realized, and when the structural parameter of the second exit area 3 is controlled to be within the range of 3 not less than D1/H1 not less than 1.1, the reflective area 4 forms the corresponding parameter, and under the control of the parameter, the reflective area 4 can greatly reduce the light overflow, so that the lens 1 has good light efficiency.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be covered by the scope of the appended claims.

Claims (25)

1. A lens, wherein an incident area and an emergent area are arranged on the lens, a reflecting area is formed on the outer side wall surface between the emergent area and the incident area, and the emergent area comprises a first emergent area and a second emergent area surrounding the first emergent area;
the second emergent area comprises a base surface and a plurality of protruding units arranged on the base surface, and the cross section shape of the base surface is gradually enlarged in the direction from the small end to the large end on the plane perpendicular to the optical axis of the lens;
the distance between the small end and the large end of the base surface is H1 in the direction along the optical axis of the lens, and D1 in the direction perpendicular to the optical axis of the lens, wherein D1/H1 is more than or equal to 3 and more than or equal to 1.1;
The convex units are arranged around the optical axis of the lens;
the basal plane of the second emergent region is concave towards the inside of the lens, the included angle between the tangent line of the basal plane and the plane vertical to the optical axis of the lens is alpha, alpha is gradually increased in the direction from the small end to the large end, the included angle between the tangent line at the small end of the basal plane and the plane vertical to the optical axis of the lens is alpha 1, and the included angle between the tangent line at the large end of the basal plane and the plane vertical to the optical axis of the lens is alpha 2, and the included angle between the tangent line at the large end of the basal plane and the plane vertical to the optical axis of the lens is more than or equal to 0 DEG and less than or equal to 35 DEG; alpha 2 is more than or equal to 5 degrees and less than or equal to 60 degrees;
the reflecting area protrudes towards the direction far away from the lens, the included angle between the tangent line of the reflecting area and the plane vertical to the optical axis of the lens is beta, beta is gradually increased in the direction from the small end to the large end, the included angle between the tangent line at the small end of the reflecting area and the plane vertical to the optical axis of the lens is beta 1, and the included angle between the tangent line at the large end of the emergent area and the plane vertical to the optical axis of the lens is beta 2, and the included angle between the tangent line at the large end of the emergent area and the plane vertical to the optical axis of the lens is 20 degrees or more and less than or equal to beta 1 or less than 55 degrees; beta 2 is more than or equal to 20 degrees and less than or equal to 75 degrees;
the incident area comprises a first incident area opposite to the first emergent area and a second incident area opposite to the reflecting area, the second incident area surrounds the outside of the first incident area, the second incident area is provided with a large end and a small end, the section shape of the second incident area is gradually enlarged in the direction from the small end to the large end on a plane perpendicular to the optical axis of the lens, and the small end of the second incident area is connected with the edge of the first incident area;
The included angle between the tangent line of the end part of the second incidence area far away from the first incidence area and the plane of the optical axis of the lens is gamma 1, and gamma 1 is more than or equal to 0 degree and less than or equal to 10 degrees; the angle between the tangent line near the end of the first incidence area and the plane of the optical axis of the lens is gamma 2, and gamma 2 is more than or equal to 0 degree and less than or equal to 10 degrees.
2. A lens according to claim 1, wherein, in a plane coplanar with the optical axis of the lens, light rays which lie in that plane and are refracted through the raised elements intersect at least some of the light rays before forming the illumination spot.
3. A lens according to claim 2, wherein, in a plane coplanar with the optical axis of the lens, the light rays which lie in that plane and are refracted out through the single convex element intersect at least a portion of the light rays before forming the illumination spot.
4. A lens according to claim 2, wherein, in a plane coplanar with the optical axis of the lens, when a single raised element has a plurality of cross-sectional elements, light rays lying in the plane and refracted through a single said cross-sectional element intersect at least a portion of the light rays before forming the illumination spot.
5. The lens of any of claims 1-4, wherein the raised elements further have a plurality of micro-optic facets disposed thereon.
6. The lens of any of claims 1-4, wherein the raised elements are disposed over the second exit region.
7. The lens of claim 1, wherein 2.5.gtoreq.D1/H1.gtoreq.1.5.
8. The lens of claim 7, wherein d1/h1=1.9±0.1.
9. The lens of claim 1, wherein α1 = 18 ° ± 1 °, α2 = 35 ° ± 1 °.
10. The lens of any one of claims 1-4, 7-9, wherein the reflective region has a large end and a small end, the cross-sectional shape of the reflective region gradually expands in a direction from the small end to the large end in a plane perpendicular to the optical axis of the lens, the distance between the small end and the large end of the reflective region is H2 in a direction along the optical axis of the lens, and D2 is 2,2 is D2/H2 is 0.5 in a direction perpendicular to the optical axis of the lens.
11. The lens of claim 10, wherein d2/h2=0.52±0.05.
12. The lens of claim 11, wherein β1 = 48 ° ± 1 °, β2 = 71 ° ± 1 °.
13. The lens of any of claims 1-4, 7 or 8, wherein the reflective region is an optical surface spliced from a plurality of optical elements, or is a continuous smooth curved surface, or is a combination of both.
14. The lens of claim 1, wherein the distance between the small end and the large end of the second incident area is H3 in a direction along the optical axis of the lens, and D3 in a direction perpendicular to the optical axis of the lens, and 0.ltoreq.d3/H3.ltoreq.0.2.
15. The lens of claim 14, wherein D3/h3 = 0.05±0.005.
16. The lens of claim 15, wherein γ1=3° ±0.3°, γ2=3° ±0.3°.
17. The lens of any one of claims 1-4, 7 and 8, wherein the first exit region is a convex surface that is convex toward a side away from the entrance region.
18. The lens of claim 17 wherein the first exit region is an optical surface spliced from a plurality of optical units.
19. The lens of any one of claims 1-4, 7 and 8, wherein the incident area is a fresnel optical surface.
20. The lens of any one of claims 1-4, 7 and 8, wherein the entrance area corresponds to a light source mounting area, and when a light source is at any position in the mounting area, the light rays refracted out of the exit area form an illumination spot with uniform light energy distribution at a designed illumination position.
21. The lens of claim 20 wherein the light source mounting area is an area axially displaced along the optical axis of the lens.
22. The lens of any one of claims 1-4, 7-9, wherein intersecting lines are formed between the convex units and the base surface, the width between intersecting lines of the single convex units is D4, the convex height of the convex units relative to the base surface is H4, 4.ltoreq.d4/h4.ltoreq.40, 4.ltoreq.d1/D4.
23. The lens of claim 22, wherein d4/h4=10±0.1 and d1/d4=36±0.1.
24. A luminaire comprising the lens of any one of claims 1-23 and a light source associated with said lens.
25. A light fixture as recited in claim 24, wherein said lens has a light source mounting region, and when the light source is at any position within said mounting region, light rays refracted by said exit region form an illumination spot having uniform light energy distribution at the intended illumination location.
CN201811260278.7A 2018-10-26 2018-10-26 Lens, lamp adopting lens and design method of lens Active CN109489002B (en)

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JP2016218185A (en) * 2015-05-18 2016-12-22 株式会社遠藤照明 Fresnel lens for lighting fixture and lighting fixture having the same
CN207762609U (en) * 2017-12-22 2018-08-24 深圳市裕富照明有限公司 Collimate LED lens and collimation LED light
CN208901325U (en) * 2018-10-26 2019-05-24 成都恒坤光电科技有限公司 A kind of lens and the lamps and lanterns using the lens

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CN202791800U (en) * 2012-08-10 2013-03-13 成都欧盛光电科技有限公司 Light distribution optical lens for light-emitting diode (LED) illumination
CN102878526A (en) * 2012-10-30 2013-01-16 成都欧盛光电科技有限公司 Light-emitting diode (LED) light-distributing lens
WO2014146998A1 (en) * 2013-03-20 2014-09-25 Osram Gmbh Optical device for light mixing
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JP2016218185A (en) * 2015-05-18 2016-12-22 株式会社遠藤照明 Fresnel lens for lighting fixture and lighting fixture having the same
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