Summary of the invention
The present invention, for solving the problems of the technologies described above, provides a kind of method for designing of speculum, and the method is simple, flexible.Not only can solve the various shape requirement of light fixture, and the illumination on can the flexible modulation face to be illuminated, meet the requirement that illumination is used, be specially adapted to road lighting.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of method of mirror design for LED light source is characterized in that: described speculum is by one
Perhaps more than one a plurality of reflecting surface is spliced successively from beginning to end, and design procedure is as follows:
A), determine the position of light source and light-emitting area towards, a plurality of and described reflecting surface of intercepting illuminated section one to one on the solstics on face to be illuminated and the line segment between closest approach, and the end points of definition illuminated section and the pip of light on reflecting surface of this end points of directive are the end points of reflecting surface, then on the cross section at light source and place, described illuminated section, the light beam of light source angle is divided into and described reflecting surface a plurality of reflecting surface subtended angles one to one successively continuously, forms the one-to-one relationship of reflecting surface, reflecting surface subtended angle and illuminated section;
B), each illuminated section is divided into to several and is shone segment, according to the requirement by according to illumination on segment, light source is to light distance and the incident angle of illuminated point, calculate respectively described a plurality of by the ratio of the luminous flux according to being distributed separately on segment, according to the corresponding order of predefined illuminated point with the pip of light on reflecting surface of this illuminated point of directive, and the regularity of distribution of light source luminescent intensity lighting angle, determine successively and describedly in corresponding reflecting surface subtended angle separately a plurality ofly according to segment, reflected one to one separately the ratio of line segment with respect to the reflection line segment subtended angle size of light source,
C), described, as first, shone segment according in segment, choosing one section wantonly, and get on it any point as the first illuminated point, this has just determined the first reflection line segment subtended angle of the first reflection line segment with respect to light source accordingly, according to the dimensional requirement of predetermined speculum and the relative position of speculum and light source, determine some light first pip on the first reflecting surface as described the first illuminated point of directive, by reflection law, tried to achieve the direction of this first reflection line segment at this first pip place, according to described the first reflection line segment subtended angle, determine again the length of this first reflection line segment,
D), described first, shone on segment according to adjacent second of segment one side, with the distance of described the first illuminated point, equal described by according to being got the second illuminated point on the position of little segment length, according to above-mentioned b) corresponding order in step, selecting an end points in two end points of the first reflection line segment is starting point, by reflection law, tried to achieve the direction of the second reflection line segment of corresponding the first reflecting surface of this second illuminated point, and according to the second reflection line segment subtended angle, determine the length of this second reflection line segment;
E), the method for a same step, the end points of last reflected ray section of take successively is starting point, determines with second all by direction and length according to the corresponding reflection line segment of segment by according to the segment homonymy;
F), described first, shone on the adjacent segment of segment opposite side, using the starting point of the first reflection line segment other end point as the corresponding reflection line segment of this adjacent segment, the method of a same step, determine all by direction and length according to the corresponding reflection line segment of segment of this side, all reflection line segments namely form a cross sectional shape of the first reflecting surface; If speculum is to consist of a reflecting surface, the normal direction of this cross sectional shape along the place, cross section stretched, form the three-dimensional shape of speculum;
G) if speculum is to be spliced by more than one a plurality of reflectings surface head and the tail successively, so, the end end points of reflection line segment on the first reflecting surface of take is the first pip of the second reflecting surface, it is also the end points of the second reflecting surface, according to the method with trying to achieve all reflection line segments on the first reflecting surface, determine direction and the length of all reflection line segments on the second reflecting surface, namely form a cross sectional shape of the second reflecting surface;
H), according to above-mentioned same method, determine the cross sectional shape of all reflectings surface;
I), by the normal direction stretching of above-mentioned all cross sectional shapes along this place, cross section, the three-dimensional shape of formation speculum.
In described a) step, described reflecting surface can be that order is corresponding successively with the one-to-one relationship of described illuminated section, can be also any correspondence.
In described a) step, described reflecting surface subtended angle can decile or decile not.
In described a) step, described a plurality of illuminated sections can overlap fully, overlap or order head and the tail connection successively.
In described a) step, described illuminated section is equal in length or do not wait.
Described b) in step, described light according to predefined illuminated point and this illuminated point of directive refers in the corresponding order of the pip on reflecting surface: the pip on reflecting surface corresponding to the light of two end points of directive illuminated section is two end points of this reflecting surface, after the corresponding relation between two end points of two end points that preset illuminated section and reflecting surface, just determined the corresponding order of illuminated point and the pip of light on reflecting surface of this illuminated point of directive on this illuminated section.
Described c) in step, described first is that the face to be illuminated top edge is shone segment according to segment.
Described c) in step, described the first illuminated point is end points or the mid point of the first quilt according to segment.
Technical solution of the present invention, due to the structure that can adopt one or more surface joining, and between a plurality of curved surfaces, also can adopt multiple connecting method, make the overall shape of the speculum formed by the plurality of surface joining can be changeable various, meet the appearance requirement of light fixture.And, adopt this method for designing, can be so that have reduced greatly the speculum of the relative single structure of size of the speculum formed by the plurality of surface joining, thus saved the cost of material.And because the corresponding relation in each curved surface in method for designing of the present invention and area to be illuminated territory can have multiple variation, such as order is corresponding or the ordered pair that has some setbacks should, and the position of each illuminated section on the area to be illuminated territory and length also can be flexible and changeable, such as overlapping, overlap, order is arranged or irregular arranging successively, thereby the Illumination Distribution on can the flexible modulation face to be illuminated, also can carry out suitable correction according to actual Illumination Distribution, meet desirable illumination needs.
The specific embodiment
A cross section of the embodiment of the present invention one speculum shown in Figure 1, in this embodiment, speculum is spliced by three reflecting surface M1, M2, M3.Below in conjunction with accompanying drawing, illustrate the design procedure of this speculum:
Before design, first by the position of light source O and its light-emitting area towards deciding.Then on a cross section, light source O beam angle is divided into to three reflecting surface subtended angle α 1, α 2, α 3, these three reflecting surface subtended angle α 1, α 2, α 3 be corresponding three reflecting surface M1, M2 of order, M3 successively.The division of three reflecting surface subtended angle sizes can be regular, can be also irregular.
In light source O and area to be illuminated (not drawn on scale, light source O can regard as spot light with respect to area to be illuminated) institute is in the plane, three sections of interceptings and above-mentioned three reflectings surface illuminated section one to one on the most distant point of face to be illuminated and the line segment between the near distance spot, the interception way of three illuminated sections can be independent of one another, be not connected mutually, can overlap each other, also can overlap fully; Can take the mode of order intercepting, also can take the arbitrarily mode of intercepting; The length of three illuminated sections can equate, also can not wait.And the end points of definition illuminated section and the pip of light on reflecting surface of this end points of directive are the end points of reflecting surface.
The corresponding relation of the reflecting surface in above-mentioned described method for designing of the present invention, reflecting surface subtended angle, illuminated section and corresponding order can be explained by following array format:
In above-mentioned array, line number represents the reflecting surface number, wherein every row represents the corresponding parameter of each reflecting surface, and in this parameter, X1, X2 mean respectively the incident angle of incident ray at two end points places of first reflecting surface M1, and these two incident raies form first reflecting surface subtended angle α 1.X2, X3 mean respectively the incident angle of incident ray at two end points places of second reflecting surface M2, and these two incident raies form second reflecting surface subtended angle α 2.X3, X4 mean respectively the incident angle of incident ray at two end points places of the 3rd reflecting surface M3, and these two incident raies form the 3rd reflecting surface subtended angle α 3.By that analogy.Y1 means the shooting angle of emergent ray at the head-end place of first reflecting surface M1, and Y2 means the shooting angle of emergent ray at the distal point place of first reflecting surface M1.Y3 means the shooting angle of emergent ray at the head-end place of second reflecting surface M2, and Y4 means the shooting angle of emergent ray at the distal point place of first reflecting surface M1.Y5, Y6 analogize.The corresponding order of the pip of light on reflecting surface of the interception way of illuminated section and illuminated point and this illuminated point of directive all can be reacted from the shooting angle of the emergent ray of two end points of above-mentioned each reflecting surface.
Below by specific embodiment, above-mentioned array is described:
Corresponding relation in embodiment mono-shown in Figure 1 between reflecting surface, reflecting surface subtended angle and illuminated section three, its array is as follows:
In this embodiment, in coordinate system shown in Figure 1, the beam angle of light source O is (270-140) °=130 °, and this beam angle is divided into to three reflecting surface subtended angle α 1=(218-140) °=78 °, α 2=(244-218) °=26 °, α 3=(270-244) °=26 °.These three reflecting surface subtended angle orders corresponding three reflecting surface M1, M2, M3.Two end points of the first and last of the first reflecting surface M1 are P1, P2, the shooting angle of the emergent ray after these two end points P1, P2 reflections is-73.30 ° ,-18.43 °, two end points of the first and last of the second reflecting surface M2 are P2, P3, the shooting angle of the emergent ray after these two end points P2, P3 reflections is-63.45 ° ,-21.80 °, two end points of the first and last of the 3rd reflecting surface M3 are P3, P4, and the shooting angle of the emergent ray after these two end points P3, P4 reflections is-45.00 ° ,-26.57 °.Illuminated section A1A2, B1B2, C1C2 on these three reflecting surface M1, M2, the corresponding face to be illuminated of M3 difference, the first and last of the first reflecting surface M1 two end points P1, P2 are two terminal A 1, the A2 of corresponding illuminated section A1A2 respectively, namely, two terminal A 1, the A2 of the illuminated section A1A2 that the first and last of the first reflecting surface M1 two end points P1, P2 are corresponding are orders from left to right, and the upper shooting angle from head-end P1 to distal point P2 of the first reflecting surface M1 is the rule of changing from small to big.The first and last of the second reflecting surface M2 two end points P2, P3 are two terminal B 1, the B2 of corresponding illuminated section B1B2 respectively, namely, two terminal B 1, the B2 of the illuminated section B1B2 that the first and last of the second reflecting surface M2 two end points P2, P3 are corresponding are orders from left to right, and the upper shooting angle from head-end P2 to distal point P3 of the second reflecting surface M2 is the rule of changing from small to big.The first and last of the 3rd reflecting surface M3 two end points P3, P4 are two end points C1, the C2 of corresponding illuminated section C1C2 respectively, namely, two end points C1, the C2 of the illuminated section C1C2 that the first and last of the 3rd reflecting surface M3 two end points P3, P4 are corresponding are orders from left to right, and the upper shooting angle from head-end P3 to distal point P4 of the 3rd reflecting surface M3 is the rule of changing from small to big.As can be seen from Figure 1, the interception way of three illuminated sections is partly overlapping.
After the division and corresponding relation of having determined reflecting surface, reflecting surface subtended angle and illuminated section, below the shape of each reflecting surface designed.
As Figure 1-1, the corresponding illuminated section A1A2 of the first reflecting surface M1 is divided into a plurality of by according to segment with equidistant l, clear for making figure, the present embodiment only is divided into four by according to segments, and its end points is respectively A1, b, c, d, A2 point.The requirement of illumination E on face to be illuminated in using according to reality, light source to illuminated point apart from r and incident angle θ (because light source O can regard spot light as with respect to face to be illuminated, this r and θ are equivalent to pip on reflecting surface to distance and the incident angle of the reflection ray of illuminated point).Because E is inversely proportional to r
2And be proportional to cos θ, therefore can calculate tetra-of A1b, bc, cd, dA2 by the ratio of the luminous flux according to being distributed separately on segment.
After having determined that each is by the ratio of the luminous flux according to required on segment, according to two terminal A 1, the A2 of illuminated section A1A2 corresponding to first and last two end points P1, P2 of the first reflecting surface M1, are corresponding orders from left to right, again according to the regularity of distribution of light source luminescent intensity lighting angle, determine described four by according to segments separately corresponding each reflection line segment with respect to the ratio of the reflection line segment subtended angle size of light source, be respectively reflection line segment subtended angle γ 1, γ 2, γ 3 and the γ 4 shown in Fig. 1-1, Fig. 1-2, Fig. 1-3.
Getting is that the first quilt shines segment according to segment A1b section, and gets its terminal A 1 as the first illuminated point.After this first quilt is determined according to segment A1b, determined that correspondingly this first quilt reflects the reflection line segment subtended angle γ 1 of line segment P1 b ' with respect to light source according to segment A1b section corresponding first.Again according in concrete the use to the dimensional requirement of speculum and with the relative position of light source O, the marginal point of speculum in the present embodiment, namely the incident angle of the first end points P1 of the first reflecting surface M1 is 140 °, on this incident ray, determine the pip of light on the first reflecting surface M1 of 1 P1 described first illuminated point A1 as directive, by reflection law, trying to achieve the direction of the reflection line segment P1b ' at this pip P1 place.According to differential theory, this first reflection line segment P1b ' can be used as first by the reflection line segment of answering according to the upper all-pair of segment A1b.
After when the orientation of this first reflection line segment P1b ', starting point P1 and with respect to the size of the reflection line segment subtended angle γ 1 of light source and position, deciding by aforesaid method, its length is also with regard to unique deciding.
Described first by adjacent according to segment A1b second by according to segment bc, with the distance of described the first illuminated point A1, equal described and got the second illuminated point on position according to the segment length l.It is the b point in Fig. 1-1.Selecting the end points b ' of the first reflection line segment P1b ' is starting point, by reflection law, try to achieve the direction of the corresponding second reflection line segment b ' c ' of this second illuminated point b, its line segment of reflection with respect to light source subtended angle is γ 2, and the length of second reflection line segment b ' c ' is decided.
The rest may be inferred, determines successively direction and the length of reflection line segment c ' d ' and d ' P2, forms the cross sectional shape of the first reflecting surface M1.
According to above-mentioned method of trying to achieve the first reflecting surface M1, determine successively the cross sectional shape of the second reflecting surface M2 and the 3rd reflecting surface M3.Respectively as shown in Fig. 1-2 and Fig. 1-3.
Fig. 2 is a cross section of embodiment of the present invention two-mirror, and this speculum also is comprised of three reflectings surface, and different from embodiment shown in Figure 1 is, the face to be illuminated of the present embodiment two is positioned on the vertical direction of face to be illuminated of embodiment mono-.
Corresponding relation in this embodiment bis-between reflecting surface, reflecting surface subtended angle and illuminated section three, its array is as follows:
In above-mentioned array, the implication of each numerical value representative is referring to the specific descriptions to embodiment illustrated in fig. 1.And the cross section of three reflectings surface ask each reflecting surface in method and embodiment mono-ask method identical.
Fig. 3 is a cross section of the embodiment of the present invention three speculums, this speculum is comprised of three reflectings surface, different from embodiment shown in Figure 2 is, two end points of the illuminated section that two end points of the first and last of each reflecting surface are corresponding have order from top to bottom, order is from top to bottom also arranged, that is, the Z value in array is different.
Corresponding relation in this embodiment tri-between reflecting surface, reflecting surface subtended angle and illuminated section three, its array is as follows:
In above-mentioned array, the implication of each numerical value representative is referring to the specific descriptions to embodiment illustrated in fig. 1.And the cross section of three reflectings surface ask each reflecting surface in method and embodiment mono-ask method identical.
Fig. 4 is a cross section of the embodiment of the present invention four speculums, different from embodiment shown in Figure 3 is that this speculum is comprised of six reflectings surface, equally, two end points of the illuminated section that two end points of the first and last of each reflecting surface are corresponding have order from top to bottom, and order is from top to bottom also arranged.
Corresponding relation in this embodiment tetra-between reflecting surface, reflecting surface subtended angle and illuminated section three, its array is as follows:
In above-mentioned array, the implication of each numerical value representative is referring to the specific descriptions to embodiment illustrated in fig. 1.And the cross section of six reflectings surface ask each reflecting surface in method and embodiment mono-ask method identical.
The reflecting surface cross sectional shape that above-mentioned four embodiment are tried to achieve stretches along the normal direction at this place, cross section, can form the three-dimensional shape of speculum.
When described number by the photograph segment was abundant, formed reflecting surface namely became level and smooth curved surface.
Method for designing of the present invention is very flexible, changeable, and each reflecting surface of speculum is responsible for the arbitrarily conversion of illuminated section of illumination, and illumination that both can each different illuminated sections of individual responsibility, also can be responsible for the illumination of some illuminated sections jointly.Like this, just can need to regulate the illumination of illuminated section according to actual illumination.Also can revise according to the distribution of actual illumination.Such as, when the illumination of a certain illuminated section of needs is larger, can be responsible for this illuminated section is irradiated by a little reflectings surface of overabsorption.To Uniform Illumination or non-uniform lighting, also can adjust division and the overlapping situation of illuminated section according to the result of ray tracing and revise the illumination result, to obtain given Illumination Distribution in advance, this is the flexible part of this patent just.Just because of have characteristics at random this and that regulate flexibly and revise, method for designing of the present invention can be regarded light source as the far field illumination for spot light except being applicable to, and is equally applicable to the situation of midfield or near field illumination, its scope of application very extensively.
In above-described embodiment, be the illuminated section example that can divide arbitrarily of an explanation to the division of illuminated section, do not represent actual applicable example.For the requirement of Uniform Illumination, allow these illuminated sections overlap fully more easily and realize, also can adopt the end to end mode do not overlapped each other.
By the quantity to speculum mean camber (being reflecting surface) and the selection of the connecting method between curved surface, can form the speculum of difformity and size, meet the requirement to speculum overall appearance and installation.