CN1948823A

CN1948823A - Compound reflecting surface for LED

Info

Publication number: CN1948823A
Application number: CNA2006101172960A
Authority: CN
Inventors: 屠其非; 周莉; 宋贤杰; 周太明
Original assignee: Fudan University
Current assignee: Fudan University
Priority date: 2006-10-19
Filing date: 2006-10-19
Publication date: 2007-04-18

Abstract

The invention consists of an LED light source and a mirror for redistributing the space light distribution of the light source. The mirror is formed by splicing several reflection curved surface units and each reflection curved surface unit is made up of a transverse bus and a longitudinal bus. Each bus is a conic and the used conic can be an arc, a para-curve or a part of a hyperbolic curve.

Description

The LED compound reflecting surface

Technical field

The invention belongs to illumination and signalling technique field, be specifically related to a kind of reflecting surface that is used for the LED of automobile lamp and normal domestic illumination.

Background technology

Along with the continuous maturation of LED (light emitting diode) technology, LED in illumination, signal Application for Field more and more widely, the thing followed is that the every performance indications to product require also more and more stricter.For illumination, class signal product, the performance of its optical profile is an important index.Because LED and conventional light source are compared from aspects such as volume and the characteristics of luminescences, have distinct characteristic, therefore design has also proposed new requirement to optical system.

In actual illumination was used, what need was to have the luminous intensity distribution that is controlled at the even transition in the certain angle scope.Therefore illuminator such as conventional light source such as incandescent lamp and gas-discharge lamp rotates symmetry or cylindro-parabolic when light beam is collimated with respect to optical system and the certain subtended angle of Yan Douyou, still can obtain evenly and the suitable light type of diffusion.For LED, because luminous point is very little to the reflecting surface subtended angle, simple parabolic reflector often produces the highly light beam of collimation, can't form the light type with suitable diffusion, need realize light distribution requirements by set of lenses usually.Though can reach same optics requirement, extra lens have increased production cost, have increased the light loss consumption, limited the appearance design free degree of light fixture simultaneously again.

Summary of the invention

The reflecting surface that the object of the present invention is to provide a kind of cost of the LED of being suitable for lamp demand low, the light consumption is few.

The reflecting surface that is applicable to LED that the present invention proposes is the innovation fully to simple rotation symmetry or cylindro-parabolic speculum, makes the optical system of light fixture only adopt speculum, according to the design needs, adjusts parameter, just can realize various luminous intensity distribution pattern.The formation and the compartment model of reflecting surface can be adjusted as required simultaneously, realizing the diversified while of luminous intensity distribution, can realize the variation of appearance and modeling again.

The LED reflecting surface that the present invention proposes by led light source 1 and the speculum 2 that is used to redistribute the spatial light distribution of light source 1 constitute.Speculum 2 is made up of the 2a amalgamation of some reflecting curved surfaces unit; Each reflecting curved surface unit 2a is formed by a horizontal bus and vertical bus control, and every bus is a conic section, and used conic section can be circular arc, parabola or a hyp part.Reflecting curved surface 2a can have n row, m row, n 〉=1, m 〉=3.Along with the increase of speculum 2 outside dimensions, under the situation that machining accuracy allows, n and m can be tens even tens, 3≤m for example, n≤30.The curved section original position of every bus, each point curvature and normal direction are by the emergent ray direction decision of position, this some place incident ray direction and the designing requirement of light source 1.

According to the needs of actual design, the reflecting curved surface unit 2a in the speculum 2 can have the form of various arrangements, distribution, and relatively the typical case can have following two kinds of structures: pyramidal structure and two-fold face structure.

The pyramidal structure form as shown in Figure 1.The optical effect face of speculum 2 is made up of n row, m row reflecting curved surface unit 2a, outwards is the scattering form by light source 1.Reflecting curved surface unit 2a area outwards increases gradually, constitutes taper mirror surface integral body, and wherein, each curved face unit 2a is by radially bus 3a rotation and forming of axial bus 3a, the axially outside scattering of bus 3a, and radially bus length increases from inside to outside gradually.Axially the conic section of bus 3a has the n section, and n is at least 1, allows and satisfies under the prerequisite of optical design requirement in machining accuracy, and n can be tens even tens, for example 3≤n≤30.Each point position, curvature and normal direction are by the emergent ray direction decision of its position with respect to light source 1, this some place incident ray direction and designing requirement on every section curve.Radially bus 3b generally adopts circular arc line, and the m section is arranged, and each section circular arc line is identical, surrounds a m limit equilateral polygon, and m is at least 3, allows and satisfies under the prerequisite of optical design requirement in machining accuracy, and m can be tens even tens, for example 3≤m≤30.As shown in Figure 2, curvature and normal direction by the axial bus 3a each point of unit curved surface 2a on the control speculum 2 can reflex to incident ray i1, i2, i3, i4 in the design point of view scope, form reflection ray r1, r2, r3, r4.It is logical that speculum 2 is collected wide-angle light, and most of light energy is controlled at 20 degree to the scope of 30 degree.By changing the normal direction at mirror unit curved surface 2a light incidence point place, can make light r1, r2, r3, r4 exit direction difference, thereby realize light energy rationally, reallocation efficiently, satisfy the luminous intensity distribution demand.Fig. 3 is the radially light-operated schematic diagram of first kind of scheme, and as seen from the figure, the curvature of the radially bus 3b by control reflector element curved surface 2a can make light suitably spread, thereby realize the effect of even outgoing hot spot.

Two-fold face version as shown in Figure 5.The optical effect face of speculum 2 is made up of n row, m row reflecting curved surface unit 2a, and vertical bus of each curved face unit is parallel, and laterally bus is also parallel.Curved face unit is formed along the path scanning of horizontal bus 4b by vertical bus 4a, is a curved surface rectangle.Vertically bus adopts conic section, total n section, n is at least 2, allow and satisfy under the prerequisite of optical design requirement in machining accuracy, n can be tens even tens, each point position, curvature and normal direction are by the emergent ray direction decision of its position with respect to light source 1, this some place incident ray direction and designing requirement on 3≤n≤30 for example, every section curve.Laterally bus 4b adopts conic section, total m section, and m is at least 1, allows and satisfies under the prerequisite of optical design requirement in machining accuracy, and m can be tens even tens, for example 3≤m≤30.。As shown in Figure 6, light i1, the i2 that led light source 1 sends, i3, the i4 reflector element curved surface 2a reflection on speculum 2 forms reflection ray r1, r2, r3, r4.Normal direction by the vertical bus 4a of control reflector element curved surface 2a each point can make light reflex to the appointed area.In vertical direction, it is logical that speculum 2 is collected wide-angle light, most of light led to be controlled in 20 to the 30 degree scopes.Fig. 7 is the horizontal light-operated schematic diagram of this programme.The same with scheme one, the curvature of the horizontal bus 4b by control reflecting curved surface unit 2a can make light further diffusion or assemble as required.Simultaneously, because the curved surface of this programme is by vertical bus 4a and laterally bus 4b control, therefore symmetric relation can form asymmetric smooth type without spin, comprise asymmetric up and down, the left and right sides is asymmetric or both direction is all asymmetric, and do not need light source or light fixture off-axis are installed.

Description of drawings

Fig. 1 is the mirror unit perspective view that constitutes first kind of scheme of the present invention.

Fig. 2 is the axial light-operated schematic diagram of first kind of scheme.

Fig. 3 is the radially light-operated schematic diagram of first kind of scheme.

Fig. 4 is other example schematic of first kind of scheme

Fig. 5 is the mirror unit perspective view that constitutes second kind of scheme of the present invention.

Fig. 6 is the vertical light-operated schematic diagram of second kind of scheme.

Fig. 7 is the horizontal light-operated schematic diagram of second kind of scheme.

Number in the figure: 1 is led light source, and 2 is speculum, and 2a is the reflecting surface curved face unit, and 3a is vertical bus of pyramidal structure, and 3b is the horizontal bus of pyramidal structure, and 4a is vertical bus of two-fold face structure, and 4b is the horizontal bus of two-fold face structure.

The specific embodiment

Apparatus of the present invention by led light source 1 and the speculum 2 that is used to redistribute the spatial light distribution of light source 1 constitute.Led light source 1 can be high-power or common power LED, and emission angle is generally greater than 60 degree.Fig. 1 to Fig. 6 is an optics example of the present invention.Led light source 1 is positioned at the focus place of speculum 2 designs, and light source becomes relation one to one with speculum.Speculum 2 is made of a series of small curved surface 2a, and the light that light source 1 sends is redistributed on two-dimensional direction.Form by this device and can be used for that automobile, signal show and the normal domestic illumination.

What Fig. 1 represented is (cone structure form) example of first kind of scheme of the present invention.As shown in Figure 2, axially bus 3a is a circular arc, has 3 sections, by the curvature and the normal direction of the axial bus 3a each point of unit curved surface 2a on the control speculum 2, incident ray i1, i2, i3, i4 can be reflexed in the 20 degree scopes of design, form reflection ray r1, r2, r3, r4.It is logical that speculum 2 is collected wide-angle light, most of light energy is controlled in the scope of 20 degree, and mainly concentrates in 10 degree.Fig. 3 is the radially light-operated schematic diagram of first kind of scheme.Radially bus 3b also is a circular arc, totally 6 sections, constitutes the bent limit shape of positive hexagon.Use circular arc that light is suitably spread, thereby realize the effect of uniform high brightness outgoing hot spot in the 5 degree scopes.Both combinations, realize light energy rationally, reallocation efficiently, can satisfy the light distribution requirements of automobile brake lamp by the combination of a plurality of illustrated cell.

Fig. 4 is the different implementations of scheme one.Change speculum 2 radially with horizontal piecemeal number, can produce different appearance and modelings.Suitably increase the number of unit curved surface 2a, can realize the more accurate control of luminous intensity distribution.

What Fig. 5 represented is an example of second kind of scheme of the present invention (two-fold face version), can be applicable to the reversing automobile lamp.As shown in Figure 6, vertically bus 4a adopts parabola, has 7 sections, does not have symmetric relation up and down.In vertical direction, it is logical that speculum 2 is collected the wide-angle light, with the logical vertical direction that is controlled at of most of light up and down in the 15 degree scopes, and optical axis is adjusted to down inclined to one side 2.5 degree, makes the light distribution more meet standard-required in vertical direction.Fig. 7 is the horizontal light-operated schematic diagram of this programme.Laterally bus 4b also adopts circular arc, and totally 4 sections, the same with scheme one, the curvature of the horizontal bus 4b by control reflector element curved surface 2a further spreads light, reaches 45 and spends, with the requirement of the wide-angle horizontal proliferation of satisfying back-up lamp.

Claims

1, a kind of LED compound reflecting surface is characterized in that by led light source (1) and the speculum (2) that is used to redistribute the spatial light distribution of light source (1) constitutes, and speculum (2) is made up of some reflecting curved surfaces unit (2a) amalgamation; Each reflecting curved surface unit (2a) is formed by a horizontal bus and vertical bus control, and every bus is a conic section, and used conic section is circular arc, parabola or a hyp part; Reflecting curved surface (2a) can have n row, m row, n 〉=1, m 〉=3; The curved section original position of every bus, each point curvature and normal direction are by the emergent ray direction decision of position, this some place incident ray direction and the designing requirement of light source (1).

2, LED compound reflecting surface according to claim 1 is characterized in that the optical effect face of speculum (2) is made up of n row, m row reflecting curved surface unit (2a), outwards is the scattering form by light source (1); Reflecting curved surface unit (2a) area outwards increases gradually, constitutes taper mirror surface integral body; Wherein, each curved face unit (2a) is by radially bus (3a) rotation and forming of axial bus (3a), axially outwards scattering of bus (3a), and radially bus length increases from inside to outside gradually; Radially bus (3b) adopts circular arc line, and the m section is arranged, and each section circular arc line is identical, surrounds a m limit equilateral polygon.

3, LED compound reflecting surface according to claim 1 is characterized in that the optical effect face of speculum (2) is made up of n row, m row reflecting curved surface unit (2a), and vertical bus of each curved face unit is parallel, and laterally bus is also parallel.

4, LED compound reflecting surface according to claim 2 is characterized in that axial bus (3a) is a circular arc line, has 3 sections, the axially curvature of bus (3a) and the design of method line method, make incident ray after the reflection of curved surface unit in 20 degree scopes; Radially bus (3b) is a circular arc line, totally 6 sections, surrounds positive hexagon curved surface shaped.

5, LED compound reflecting surface according to claim 3 is characterized in that vertical bus (4a) adopts parabola, and totally 7 sections, in vertical direction, speculum (2) is controlled in the upper and lower 15 degree scopes of vertical direction most of light is logical; Radially bus (4b) adopts circular arc line, and totally 4 sections, control the radially curvature of bus (4b), making the light range of scatter is 45 degree.