CN112764213B - Design and processing method of lamp tube reflector - Google Patents
Design and processing method of lamp tube reflector Download PDFInfo
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- CN112764213B CN112764213B CN202110045483.7A CN202110045483A CN112764213B CN 112764213 B CN112764213 B CN 112764213B CN 202110045483 A CN202110045483 A CN 202110045483A CN 112764213 B CN112764213 B CN 112764213B
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- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000005286 illumination Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000004134 energy conservation Methods 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 18
- 230000037237 body shape Effects 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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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
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
Abstract
The invention discloses a design and processing method of a lamp tube reflecting cover, which comprises the following steps: setting a lamp tube projection point O, directly emitting light from an emergent point at a boundary point R2 on an illuminated surface and a boundary point R1 on the illuminated surface, enabling the illumination in the range of O-R1 to be equal to the illumination in the range of R1-R2, and calculating the position of R1 according to an energy distribution equation; according to the principle that the energy emitted by the lamp tube is equal to the energy corresponding to the illumination on the illuminated surface, energy conservation equations in the range of O-R1 and the range of R1-R2 are listed, and the buses of the upper half curve and the lower half curve are obtained; the two are symmetrically copied by a vertical coordinate to obtain a reflector main body curve, the reflector main body curve is stretched to obtain the main body shape of the reflector, and then certain processing can be carried out according to the reflector main body shape to obtain the reflector. The design method of the invention adopts the free-form surface to carry out optical design, the illumination of the lamp tube light is relatively uniformly distributed in the cross section direction, and the energy utilization rate of the lamp tube is improved; and the processing method is relatively simple and convenient, and is convenient for production.
Description
Technical Field
The invention relates to a design method of a lamp tube reflector, in particular to a design and processing method of a one-way uniform lamp tube reflector based on a free-form surface.
Background
Different from an LED planar luminous surface, a traditional fluorescent lamp, a mercury lamp and the like can emit light at all angles, and a luminous body with a cylindrical side surface can cause that the illumination intensity on a target irradiation surface is not uniform enough when no good optical secondary light distribution design is provided; and at present, a few secondary light distribution design methods are used for the lamps. In the existing fluorescent lamp design method, the fluorescent lamp reflector with trapezoidal side bus is designed more, then the reflector is arc-shaped or symmetrical parabola-shaped, and other devices for homogenizing light are added under the reflector. The disadvantages of the secondary light distribution designs are as follows: on the target illumination surface, either the illumination distribution is not uniform, or the energy utilization rate is not high, or the structure is relatively complex. In the application of indoor illumination, uneven illumination not only makes the lamp arrangement more difficult, but also the different illuminations received by people at different illumination points can damage the vision. In the UV-C sterilization application, the uneven illumination can cause different bacterial inactivation rates at different positions of a target surface, and the sterilization effect is influenced. The design method of the reflecting cover capable of adjusting the emergent light of the lamp and adjusting the illumination of the target surface to be uniform has application value in many aspects.
Compared with the traditional optical curved surface, the free-form surface illumination optical system has higher design freedom, can finely regulate and control light, achieves target energy distribution while realizing the shaping of light spot appearance, and realizes complex illumination output; meanwhile, the system also has more flexible spatial layout. Two important functions of the free form surface: (1) realizing a light spot of a predetermined shape; (2) an illumination area specific energy distribution is achieved. In illumination, the spot shape is usually designed to be a round square, and the energy or illumination distribution is uniform. Due to the size, if the reflector in the long axis direction of the lamp tube is designed, the reflector is oversized and the volume is oversized, so that the invention provides a free-form surface lamp tube reflector design method, and the design mainly aims at the light in the cross section direction of the lamp tube to perform reflection design, namely the free-form surface bus combination is stretched to obtain the shape of the reflector.
Disclosure of Invention
One of the objectives of the present invention is to provide a design method for a lamp reflector, which adopts a free-form surface to design, so as to achieve relatively uniform distribution of illumination in the cross-sectional direction of the reflector, and improve the energy utilization rate of the lamp.
The second purpose of the invention is to provide a processing method of a lamp reflector, which processes according to the shape of the reflector body obtained by the design method of the lamp reflector.
In order to realize the first invention, the following technical scheme is adopted:
a design method of a lamp tube reflector comprises the following steps:
using the circular points of the lamp tube as emergent points, and using horizontal lines passing through the emergent points as boundary lines of the upper half part and the lower half part of the reflector of the lamp tube;
the corresponding point of the vertical projection of the emergent point on the illuminated surface is 0, the boundary point of the emergent point direct emergent light on the illuminated surface is R2, namely the radius range of the emergent point direct emergent light on the illuminated surface is O-R2;
determining a demarcation point R1 on an O-R2 connecting line, so that the illumination in the range of O-R1 is equal to the illumination in the range of R1-R2, wherein the light in the range of an illuminated surface O-R1 is the superposition of the light which freely exits and the light reflected by the upper half reflector, the light in the range of the illuminated surface R1-R2 is the superposition of the light which freely exits and the light reflected by the lower half reflector, namely the position of R1 is obtained according to a first energy distribution equation in the range of O-R1 and the range of R1-R2;
according to the principle that the energy corresponding to the light intensity emitted by the lamp tube is equal to the energy corresponding to the illumination on the illuminated surface, namely the light in the range of O-R1 is the superposition of the free emergent light and the reflected light of the upper half part reflector, a second energy conservation equation in the range of O-R1 is listed, and the bus of the upper half part curve is obtained;
According to the principle that the energy corresponding to the light intensity emitted by the lamp tube is equal to the energy corresponding to the illumination on the illuminated surface, namely the light in the range of R1-R2 is the superposition of free emergent light and the reflected light of the lower half reflector, a third energy conservation equation in the range of R1-R2 is listed, and the generatrix of the curve of the lower half is obtained;
setting a coordinate system by using the lamp tube dots, and symmetrically copying a bus of the upper half part curve and a bus of the lower half part curve through a vertical coordinate to obtain a reflector main body curve;
the upper half part curve generatrix and the lower half part curve generatrix are shown in figure 1.
The curve of the reflector body is a curve presented by the cross section of the reflector, and is shown in figure 2;
the upper half curve generatrix is a partial curve of the upper half curve on a positive axis or a negative axis on the abscissa;
the lower half curve generatrix is a partial curve of the lower half curve on a positive axis or a negative axis on the abscissa.
The first energy distribution equation is:
where a1 is the distance between O-R1, a2 is the distance between O-R2, and H is the distance from the exit point to the illuminated plane.
The second energy conservation equation is:
wherein E is the illumination of the illuminated surface, I is the light intensity of emergent light, theta is the angle of emergent light of the lamp tube, R1 is the position variable of light on the illuminated surface, and the range is O-R1;
And solving a second energy conservation equation by combining with a Snell equation to obtain the relation between the emergent angle theta of the emergent light and the coordinate point of the upper half curve, and finally, calculating the position coordinate of the generatrix of the upper half curve by changing the value of theta.
The third energy conservation equation is:
wherein R2 is the position variable of the light on the illuminated surface and ranges from R1-R2;
and combining a third energy conservation equation of a Snell equation to obtain the relation between the emergent angle theta of the emergent light and the coordinate point of the lower half curve, and finally, calculating the position coordinate of the lower half curve bus by changing the value of theta.
The principle of the design method of the invention is as follows:
in the scheme, the lamp tube reflector is divided into an upper half part and a lower half part in the step (1). The light emitted by the lamp tube at the lower half part is projected to the illuminated surface and is the superposition of the directly emergent light and the light reflected by the reflector at the lower half part. The light emitted by the upper half part of the lamp tube is projected to the illuminated surface and is superposed by the reflected light which passes through the upper half part of the reflecting cover and is reflected twice by the lower half part of the reflecting cover.
In the design method of the lamp tube reflector, only the emergent direction with the strongest intensity, namely the normal direction of the curved surface of the lamp tube, is considered.
Referring to fig. 3, the irradiation range of the light directly emitted from the left half part of the lamp tube is O-R2, i.e. the light directly emitted from the lamp tube exists in the ranges of the half-side illuminated surfaces O-R1 and R1-R2. Referring to FIG. 4, the light in the illuminated surface O-R1 is a superposition of the free-going light and the light reflected by the upper reflector half; the light within the range of the illuminated surface R1 to R2 is superimposed on the light reflected by the lower half reflector.
From the edge ray theory, it is known that the incident ray at the edge is also at the edge in the illuminated surface. Therefore, in the designed upper half part reflector, after the light emitted from the center of the upper half part lamp tube is reflected, the light just rubs the edge of the lower half part reflector and falls to the position of R1; the light emitted from the edge of the upper half part is reflected by the reflecting cover and falls to the right lower part of the lamp tube to be emitted. Because the light emitted by some lamp tubes has great loss after passing through the lamp tubes, the design of the invention aims to ensure that the light emitted by the upper half part of the lamp tubes near the center can bypass the lamp tubes after being reflected by the reflecting cover, thereby achieving higher energy utilization rate. In the designed lower-half reflector, the light received at the junction between the lower-half reflector and the upper-half reflector is reflected and distributed to the position of illuminated R1, and the light received at the edge of the lower-half reflector is reflected and distributed to the position of illuminated R2, so that the light rays with the crossed edges can change the curvature of the lower-half reflector more quickly, namely the reflector can complete the uniform distribution of the light passing from R1 to R2 points with smaller size.
After being reflected, the light emitted from the center of the upper half part of the fluorescent lamp just scrapes the edge of the lower half part of the reflector, the radius of the light falling on the illuminated surface is R1, the light in the range of O-R1 and the light in the range of R1-R2 are overlapped by the free emergent light and the reflected light of the reflector, the uniform illumination is achieved after the overlapping, the illumination of each point in the range of O-R1 and the range of R1-R2 are equal, and the R1 can only be determined to be a fixed value.
The main body shape of the lamp tube reflector is formed by stretching the curve of the reflector main body along the vertical direction vertical to the surface of the reflector main body, and the length of the reflector after stretching is consistent with or slightly longer than that of the lamp tube. The main body shape of the reflector is the shape of the inner surface of the reflector.
The lamp tube is a luminous body which can emit light at all angles, and the light-emitting surface is a cylindrical side surface; may be a fluorescent lamp, a mercury lamp, an ultraviolet lamp, etc.
In order to realize the second invention, the following technical scheme is adopted:
a lamp tube reflector processing method according to the design method comprises the following steps: and after the curve shape of the reflector body is obtained through calculation, the lamp tube reflector is processed and manufactured in a mode of splicing and molding after stamping a whole mirror surface aluminum alloy or stamping a small mirror surface aluminum alloy.
The processing method can improve the excellent rate to reduce the cost, wherein the size of the die can be reduced by the splicing forming mode after the small mirror-surface aluminum alloy is punched.
In order to realize the second invention, the following other technical scheme is adopted:
a lamp tube reflector processing method according to the design method comprises the following steps: after the shape of the reflector body is obtained through calculation, the lamp reflector is manufactured by firstly manufacturing a lamp reflector framework with the reflector body curve through injection molding or alloy and then covering the surface with a reflecting material. The process described facilitates raw material savings when multiple materials are required.
The invention has the beneficial effects that:
1. the lamp shade designed by the design method of the invention has the advantage that the illuminance of the lamp tube light is relatively uniformly distributed in the cross section direction.
The reflecting cover designed by the method greatly utilizes the illumination intensity of the lamp tube in the illumination range, improves the energy utilization rate of the lamp tube, namely improves the ratio of the energy received by the receiving surface to the energy emitted by the emitting surface, and further promotes energy conservation and emission reduction. But also has important significance for other optical designs or other applications of propelling the lamp; for example: the design of the reflector is completed in a relatively compact design, and other optical devices with functions of soft light and the like can be conveniently added behind the reflector.
The design method of the invention has relatively fixed steps and has universal significance for lamps such as lamp tubes; the reflecting cover designed by the design method has the advantages of simple structure and low cost, and can be well popularized and applied.
The design method of the lamp tube reflector adopts the free-form surface to carry out optical design, can finely regulate and control light rays, realizes specific energy distribution of an illumination area, and simultaneously has more flexible spatial layout for an illumination system.
2. The method for processing the reflecting cover obtained by the design method is relatively simple and convenient, is convenient to realize, is flexible, is suitable for different reflecting cover structures and different materials, and is practical, and the yield can be improved, the raw materials can be saved, and the cost can be reduced.
Drawings
FIG. 1 is a schematic illustration of an upper half curved generatrix and a lower half curved generatrix;
FIG. 2 is a schematic illustration of the curve of the bowl body;
FIG. 3 is a schematic diagram of the direct light emitted from the lamp;
FIG. 4 is a schematic illustration of light reflected by a reflector;
FIG. 5 is a three-dimensional model view of a reflector according to an embodiment;
FIG. 6 is a three-dimensional model view of a reflector according to an embodiment;
FIG. 7 is a graph of irradiation energy distribution using the reflector according to the embodiment;
FIG. 8 is a graph showing irradiation energy in a cross-sectional direction of a lamp tube using the reflector according to the embodiment;
FIG. 9 is a three-dimensional model of a reflector of a comparative example;
fig. 10 is a graph of irradiation energy distribution using the reflection cover of the comparative example.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the present invention will be described more clearly and completely below with reference to specific embodiments of the present application.
Examples
An ultraviolet germicidal lamp is selected as the lamp tube in the design of the reflector:
(1) an ultraviolet lamp tube with the diameter of 26.0mm and the length of 436.0mm and the radiant energy of 4.0W is selected as a light source, the distance H from an irradiated surface to an emergent point is set to be 500mm, the radius range O-R2 of the emergent point directly emergent light on the irradiated surface is set to be 340mm, namely a2 is set to be 340 mm;
(2) solving a demarcation point R1 according to an energy distribution equation, wherein light in the range of O-R1 is formed by overlapping free emergent light and reflected light of the upper half portion of the reflecting cover, light in the range of R1-R2 is formed by overlapping the free emergent light and the reflected light of the lower half portion of the reflecting cover, and the uniform illumination is achieved after overlapping, and listing a first energy distribution equation as follows:
(3) According to the fact that the energy corresponding to the light intensity emitted by the ultraviolet lamp is equal to the energy corresponding to the illumination of the illuminated surface, namely the light in the range of O-R1 is the superposition of the free emergent light and the reflected light of the upper half part of the reflector, an energy conservation equation in the range of O-R1 is listed, namely a second energy conservation equation:
Where R1 is the position variable on the illuminated surface, ranging from O-R1.
Integrating and then entering the target surface parameters H, and substituting into a specific condition: when theta is equal to 0, R1 is equal to R1, and the relation between E and I is obtained;
substituting the relation between E and I into a second energy conservation equation to obtain the relation between r1 and theta, wherein the equation between r1 and theta is as follows:
r1＝213.7152/(cos(atan(213.7152/500))-2)*(-1+cos(atan(r1/500))-cos(θ))。
and substituting the equation of r1 and theta into the geometrical relation between the target surface and the emergent light:
The vector rho can be obtained by changing theta;
the coordinates (x, y) of the upper half curve line are obtained by x ═ ρ × cos θ and y ═ ρ × sin θ.
The coordinate points of the upper half reflector generatrix calculated in this example are:
115，7.04171909509728E-15
113.168210638795，2.26366604296388
111.335595136793，4.45580048592173
109.50309590113，6.57808134682119
107.671610569387，8.63215196504516
105.84199357559，10.6196217182772
104.015058972012，12.54206687084
102.191580710326，14.4010312066042
100.372296828232，16.1980271348945
98.5579095086575，17.9345363764769
96.7490837178247，19.6120101958718
94.9464494927728，21.2318701108268
93.150604118442，22.7955086957256
91.362114191276，24.3042904725344
89.5815174316592，25.7595528440039
87.8093197319623，27.1626056466575
86.0459998012982，28.5147326960768
84.2920085345646，29.817191942664
82.5477684824325，31.0712154534734
80.8136754844298，32.278010055874
79.0901002134912，33.4387580395857
77.3773896304102，34.5546179121075
75.6758679502716，35.6267250158205
73.9858342456632，36.6561905092968
72.3075667497147，37.6441033669847
70.6413212754868，38.5915296986536
68.9873315935571，39.4995128413858
67.3458106324285，40.369073888969
65.7169516105794，41.2012122573334
64.1009290994655，41.9969062822683
62.4978994117896，42.7571134316418
60.9079993922219，43.4827693437028
59.3313494608468，44.1747897051066
57.7680523897569，44.8340692651005
56.2181940137732，45.4614820792093
54.6818441457266，46.0578819462386
53.1590574391087，46.6241028674447
51.6498741979081，47.1609595250442
50.1543204682559，47.6692471448958
48.6724079335984，48.1497410758766
47.204135624525，48.6031980912456
45.7494894247809，49.0303556203604
44.3084427828605，49.4319320829472
42.8809574202107，49.8086272730194
41.4669839979928，50.161122755472
40.0664627425483，50.4900822731968
38.6793234501267，50.7961514013178
37.3054860344331，51.0799578120764
35.9448612698443，51.3421118549922
34.5973508654828，51.583206257234
33.2628480333287，51.8038164711282
31.9412380226612，52.0045010284146
30.6323986211605，52.1858018995555
29.3362006132814，52.3482448389629
28.0525078531987，52.4923390664218
26.7811778860399，52.618577884091
25.5220622750159，52.7274388383501
24.2750068788892，52.8193837790589
23.0398522560552，52.8948591826077
21.8164340414784，52.9542964745874
20.6045832970623，52.9981123507756
19.4041268207752，53.0267090533536
18.2148872954345，53.0404742331527
17.0366837031514，53.0397815232589
15.8693315391496，53.0249906386512
14.7126430585109，52.9964475771411
13.5664275332917，52.9544848963075
12.4304914890149，52.8994219837669
11.3046389213256，52.8315653198313
10.1886714862838，52.7512086935585
9.08238864691272，52.658633233622
7.98558788005037，52.5541077665486
6.89806483057818，52.4378890066323
5.81961345676526，52.3102217565765
4.75002616358932，52.1713391076746
3.68909392266341，52.0214626280359
2.63660637974618，51.8608025382805
1.5923519506946，51.689557869656
0.556117907759661，51.5079166273074
0324128755766171E-15，51.451987892
(4) according to the fact that the energy corresponding to the light intensity emitted by the fluorescent lamp is equal to the energy corresponding to the illumination of the illuminated surface, namely the light in the range from R1 to R2 is the superposition of the free emergent light and the reflected light of the lower half reflector, an energy conservation equation in the range from R1 to R2 is listed, namely a third energy conservation equation:
wherein R2 is the position variable on the illuminated surface and ranges from R1-R2.
Integrating and entering the target surface parameters H, and substituting into specific conditions: when 0 ═ arctan (R2/H), R2 ═ R2, the relationship between E and I was determined;
Substituting the relation between E and I into the third energy conservation equation to obtain a differential equation or the relation between r2 and theta, wherein the relation between r2 and theta is as follows: -0.0058 ═ (r2-213.7152) ═ cos (atan (213.7152/500)) -cos (atan (r2/500)) -cos (theta)))
And substituting the equation of r2 and theta into the geometrical relation between the target surface and the emergent light:
the vector rho can be obtained by changing theta;
the coordinates (x, y) of the lower half curve generatrix are obtained by x ═ ρ × cos θ and y ═ ρ × sin θ.
The coordinate points of the lower half reflector generatrix calculated in this example are:
-115，7.04171909509728E-15
-116.232800499211，2.3249660137196
-117.449859689864，4.70050158922255
-118.650459463898，7.12758272054642
-119.833853064875，9.60721238163591
-120.99926371848，12.1404214477746
-122.145882013186，14.7282694962403
-123.272864965869，17.3718457328999
-124.379333901882，20.0722698316905
-125.464373988922，22.8306930460874
-126.527031953159，25.6482991400318
-127.566312955728，28.5263051084314
-128.581179571768，31.4659622959396
-129.570548914665，34.4685571845977
-130.533292038968，37.535412779146
-131.468230494407，40.6678893639535
-132.374132765243，43.8673851241478
-133.2497128111，47.1353374094081
-134.093626635376，50.4732234525768
-134.9044710124，53.8825619032704
-135.680778807958，57.3649131931173
-136.421015111641，60.9218800851346
-137.123574791923，64.5551088427341
-137.786778759244，68.266289937215
-138.408871376316，72.0571593707833
-138.988014526289，75.9294983941569
-139.522283614985，79.8851340674882
-140.009663366327，83.9259397507843
-140.448044077066，88.0538359331777
-140.835217037643，92.2707906775427
-141.168867487693，96.5788184402414
-141.44657025929，100.979980469166
-141.665783645494，105.476384033345
-141.823845171109，110.070182995677
-141.917964854911，114.763576617007
-141.945217280807，119.558807177931
-141.902536215019，124.45815942502
-141.786707039923，129.463958155583
-141.594360856786，134.578567090303
-141.321966120737，139.804385399024
-140.965820019127，145.143843517916
-140.522041511927，150.599400221871
-139.986562608039，156.173537609463
-139.355120081108，161.868756023514
-138.623246520056，167.687567675314
-137.786261247468，173.632489376535
-136.839261403886，179.706034643517
-135.777112207861，185.910703777499
-134.594437759481，192.248973410406
(5) and setting a coordinate system by using the lamp tube dots, and symmetrically copying a bus of the upper half curve and a bus of the lower half curve through a vertical coordinate to obtain a reflector main body curve.
(6) The main body shape of the lamp tube reflector is formed by stretching the curve of the reflector main body along the vertical direction vertical to the surface of the reflector main body.
A three-dimensional model of the bowl is shown in figures 5 and 6.
The reflector obtained in the examples was obtained by processing the main body into a predetermined shape. The specific processing method comprises the following steps:
the method comprises the following steps: the shape of the reflector is obtained by stamping a whole mirror surface aluminum alloy, or the reflector can be obtained by stamping a mirror surface small aluminum alloy and then spliced.
The method 2 comprises the following steps: the framework in the shape of the reflector is made of injection molding or alloy, and then the surface is covered with the reflecting material.
Comparative example
The comparative example is a conventional lamp reflector in the shape of a trapezoid, and a three-dimensional model thereof is shown in fig. 9.
As shown in FIG. 7, the irradiation energy distribution diagram shows that the irradiance of the reflector designed by the invention in the x direction is basically consistent in the vicinity of 0-340mm, and then the reflector is rapidly changed into black outwards to be basically free of irradiation energy. The illuminance on the cross section of the reflector is shown in fig. 8, with relatively uniform irradiance at 340mm from 0mm at the center, and irradiance above 340mm begins to decay sharply and return to 0 quickly. It can also be seen from fig. 7 that the energy utilization efficiency of the lamp using the reflector designed according to the present invention is about 79% (i.e. luminous flux/emitted luminous flux shown in the figure) on the illuminated surface.
As shown in FIG. 10, with the reflector, irradiation energy is available from 0mm to 500mm in the x direction, but irradiance is too concentrated in the narrower middle region, i.e., near 0mm to 200mm, and irradiance drops significantly above 200 mm. The reflector inevitably generates a phenomenon of overlarge illumination of the middle area, namely a glare phenomenon, and the energy utilization rate of the illuminated surface is low and is only about 68 percent.
In summary, compared with the existing reflector, the reflector designed and processed by the method of the invention has the advantages that the illuminance of the lamp tube is relatively uniformly distributed in the cross section direction, and the energy utilization rate on the illuminated surface is higher.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The above-described embodiments of the present invention are to be considered in all respects as illustrative and not restrictive. Therefore, any minor modifications, equivalent changes and modifications to the above embodiments according to the spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A design method of a lamp tube reflector is characterized in that: the method comprises the following steps:
using the circular points of the lamp tube as emergent points, and using horizontal lines passing through the emergent points as boundary lines of the upper half part and the lower half part of the reflector of the lamp tube;
the corresponding point of the emergent point vertically projected on the illuminated surface is O, the boundary point of the emergent point directly emergent light on the illuminated surface is R2, namely the radius range of the emergent point directly emergent light on the illuminated surface is O-R2;
determining a demarcation point R1 on an O-R2 connecting line, so that the illumination in the range of O-R1 is equal to the illumination in the range of R1-R2, wherein the light in the range of an illuminated surface O-R1 is the superposition of the light which freely exits and the light reflected by the upper half reflector, the light in the range of the illuminated surface R1-R2 is the superposition of the light which freely exits and the light reflected by the lower half reflector, namely the position of R1 is obtained according to a first energy distribution equation in the range of O-R1 and the range of R1-R2; the first energy distribution equation is:
Wherein a1 is the distance between O-R1, a2 is the distance between O-R2, and H is the distance from the exit point to the illuminated plane;
according to the principle that the energy corresponding to the light intensity emitted by the lamp tube is equal to the energy corresponding to the illumination on the illuminated surface, namely the light in the range of O-R1 is the superposition of the free emergent light and the reflected light of the upper half part reflector, a second energy conservation equation in the range of O-R1 is listed, and the bus of the upper half part curve is obtained; the second energy conservation equation is:
wherein E is the illumination of the illuminated surface, I is the light intensity of emergent light, theta is the angle of emergent light of the lamp tube, R1 is the position variable of light on the illuminated surface, and the range is O-R1; solving a second energy conservation equation by combining a Snell equation to obtain the relation between the emergent angle theta of emergent light and the coordinate point of the upper half curve, and finally solving the position coordinate of the generatrix of the upper half curve by changing the value of theta;
according to the principle that the energy corresponding to the light intensity emitted by the lamp tube is equal to the energy corresponding to the illumination on the illuminated surface, namely the light in the range of R1-R2 is the superposition of free emergent light and the reflected light of the lower half reflector, a third energy conservation equation in the range of R1-R2 is listed, and the generatrix of the curve of the lower half is obtained; the third energy conservation equation is:
Wherein R2 is the position variable of the light on the illuminated surface and ranges from R1 to R2; the method specifically comprises the steps of combining a third energy conservation equation of a Snell equation to obtain the relation between the emergent angle theta of emergent light and a coordinate point of a curve of the lower half part, and finally obtaining the position coordinate of a curve bus of the lower half part by changing the value of theta;
setting a coordinate system by using the lamp tube dots, and symmetrically copying a bus of the upper half part curve and a bus of the lower half part curve through a vertical coordinate to obtain a reflector main body curve;
the reflector body curve is a curve presented by the cross section of the reflector.
2. The design method of lamp tube reflector according to claim 1, characterized in that: the main body shape of the lamp tube reflector is formed by stretching the curve of the reflector main body along the vertical direction vertical to the surface of the reflector.
3. The design method of lamp tube reflector according to claim 2, characterized in that: the main body shape of the reflector is the shape of the inner surface of the reflector.
4. A design method of a lamp tube reflecting cover according to any one of claims 1-3, characterized in that: the lamp tube is a luminous body which can emit light at all angles and the light-emitting surface of which is a cylindrical side surface.
5. The design method of lamp tube reflector according to claim 4, characterized in that: the lamp tube is a fluorescent lamp, a mercury lamp or an ultraviolet lamp.
6. A lamp reflector processing method according to the design method of claim 1, characterized in that: and after the curve shape of the reflector body is obtained through calculation, the lamp tube reflector is processed and manufactured in a mode of splicing and molding after stamping a whole mirror surface aluminum alloy or stamping a small mirror surface aluminum alloy.
7. A lamp reflector processing method according to the design method of claim 6, characterized in that: after the shape of the reflector body is obtained through calculation, the lamp reflector is manufactured by firstly manufacturing a lamp reflector framework with the reflector body curve through injection molding or alloy and then covering the surface with a reflecting material.
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| US6918684B2 (en) * | 2003-07-22 | 2005-07-19 | Acuity Brands, Inc. | Luminaires for illumination of outdoor panels |
| CN100590346C (en) * | 2007-12-29 | 2010-02-17 | 清华大学深圳研究生院 | LED road lamp |
| CN101556025B (en) * | 2009-05-19 | 2011-03-16 | 华南理工大学 | Reflective cup for LED lamp |
| TWI428540B (en) * | 2010-09-01 | 2014-03-01 | Taiwan Network Comp & Electronic Co Ltd | The structure of a lamp with a special reflector |
| CN101963329B (en) * | 2010-09-30 | 2013-11-27 | 海洋王照明科技股份有限公司 | Reflecting cup and lamp comprising same |
| CA2916836C (en) * | 2014-07-31 | 2017-12-12 | Mtt Innovation Incorporated | Numerical approaches for free-form lensing: area parameterization free-form lensing |
| US20180149320A1 (en) * | 2015-04-10 | 2018-05-31 | Abram Corporation | Light-emitting diode type lighting device |
| CN108873322B (en) * | 2018-07-02 | 2020-09-22 | 中国工程物理研究院激光聚变研究中心 | Method and system for determining curved surface structure of long-focal-depth aspheric reflector |
| US10837621B2 (en) * | 2019-01-25 | 2020-11-17 | Mitsubishi Electric Research Laboratories, Inc. | Methods and systems for freeform irradiance tailoring for light fields |
| CN111487769A (en) * | 2020-04-25 | 2020-08-04 | 复旦大学 | Method for designing total internal reflection lens for customized illumination |
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Effective date of registration: 20240103 Address after: Room 411, 4th Floor, Building C, No. 2 Cuizhu 2nd Street, Qianshan, Xiangzhou District, Zhuhai City, Guangdong Province, 519000 Patentee after: Shida Ruili Optoelectronic Technology (Zhuhai) Co.,Ltd. Address before: 511518 No.10, t0218 / F, Tianan Zhigu science and Technology Industrial Park, 18 Chuangxing Avenue, Qingyuan high tech Industrial Development Zone, Guangdong Province Patentee before: Normal University Rayleigh Optoelectronic Technology (Qingyuan) Co.,Ltd. |