In general daily life, all visible various lighting apparatus everywhere, for example, fluorescent lamp, street lamp, desk lamp, skill
Art lamp etc..In above-mentioned lighting apparatus, traditionally most of is with osram lamp as illuminating source.In recent years, due to section
Skill is maked rapid progress, using light emitting diode (LED) as light sources.Notably, in addition to lighting apparatus, for general traffic number
Will, billboard, car light etc. are also changed to use light emitting diode as illuminating source.As previously mentioned, being made using light emitting diode
For illuminating source, it is advantageous in that power saving, and brightness is bigger, therefore in the upper gradually generalization of use.
With popularizing for LED lamp, more and more occasions begin to use LED lamp, such as market, hotel, house.Especially
It is the use of hotel's lamps and lanterns, the more harsh requirement that guest proposes the use of its light, such as uniform illumination, hot spot is beautiful.
Not for the hot spot that in existing ground footlight or because lens is not used to concentrate emergent light very, is radiated on floor
Rule or be because used common collector lens, being radiated on floor only is a circular hot spot, such hot spot
Do not meet the actual use occasion of ground footlight, also unevenly, it is plain because ground footlight institute range of exposures is often one long
Summary of the invention
In view of this, it is necessary to provide a kind of uniform illumination, a kind of lens and the LED with the lens of hot spot rule
Footlights, to overcome the above shortcomings.
A kind of lens include an optical axis, a light-emitting surface intersected with the optical axis, and one opens up along the optical axis
Light source setting cylinder and a fully reflecting surface being arranged between the light source setting cylinder and light-emitting surface.Along the optical axis
Angle on section between the optical axis and light-emitting surface is acute angle.The light-emitting surface is two elliptical intersecting areas.This two
Ellipse has the long axis of equal length and coincidence and the major and minor axis and short axis of different length.The intersecting area is described short
Ellipse and the union of the half of the oval supplementary set in the ellipse where major and minor axis where short axis where axis.The light source
The central axis and optical axis coincidence of cylinder are set.The light that the fully reflecting surface is used to be projected on the fully reflecting surface is all reflected towards out
A kind of LED ground footlight includes a shell, and shell described in a lens disposed in the housing includes one
Wedge-shaped light output groove.The lens include an optical axis, and a light-emitting surface intersected with the optical axis, one opens up along the optical axis
Light source setting cylinder and a fully reflecting surface being arranged between light source setting cylinder and light-emitting surface.Along the optical axis
Section on angle between the optical axis and light-emitting surface be acute angle.The light-emitting surface is two elliptical intersecting areas.This two
The major and minor axis and short axis of a oval long axis and different length that there is equal length and be overlapped.The intersecting area is described short
Ellipse and the union of the half of the oval supplementary set in the ellipse where major and minor axis where short axis where short axle.The light
The central axis and optical axis coincidence of source setting cylinder.The light that the fully reflecting surface is used to be projected on the fully reflecting surface is all reflected towards
Light-emitting surface.On the cross section of the wedge-shaped light output groove, the shortest a line of the wedge-shaped light output groove is arranged in the lens
Compared with prior art, the present invention is since the light-emitting surface of the lens is made of two elliptical intersecting areas,
The intersecting area is that the long axis by two with equal length intersect with the ellipse of the short axle of different length, and the light of lens
Axis and the light-emitting surface are also vertical, while the shell for the lens to be arranged has a wedge-shaped light output groove, so as to the greatest extent most
The hot spot of LED ground footlight projection is formed into big degree a strip, to achieve the purpose that regular light spot shape.
Specific embodiments of the present invention are further elaborated below based on attached drawing.It should be appreciated that this place is retouched
The specific embodiment stated only is used as embodiment, is not intended to limit the scope of protection of the present invention.
Referring to Fig. 1, it is a kind of structural decomposition diagram of LED ground footlight 100 provided by the invention.The LED
Footlights 100 include a shell 10, and a lens group 20 being arranged on the shell 10 and one are arranged in the shell
Illuminating module 30 on 10.The lens group 20 is arranged between the shell 10 and illuminating module 30.It is envisioned that institute
Stating LED ground footlight 100 further includes other some functional module groups, such as power module, mounting assembly, wire assembly etc., for this
Technology known by the technical staff of field, details are not described herein.
The shell 10 can be die cast or injection molding framework comprising a wedge-shaped light output groove 11.The wedge shape
Light output groove 11 is formed by the shape of hot spot for the emergent light of LED ground footlight 100 described in regulation on floor.In the wedge shape
On the cross section of light output groove 11, it is described wedge shape light output groove 11 have three sides, i.e., shortest a line, longest a line, with
And a line of moderate-length.The length of a line of the moderate-length is between the shortest a line and longest a line
Length between.On the cross section of the wedge shape light output groove 11, the wedge-shaped light output groove 11 is arranged in most in the lens group 11
In short a line, while the side of the moderate-length of the wedge-shaped light output groove 11 is arranged in the opening of the wedge-shaped light output groove 11
The lens group 20 includes the mounting portion 22 that a lens 21 and one are used to install the lens 21.Such as Fig. 2 and Fig. 4
Shown, the lens 21 include an optical axis 211, and a light-emitting surface 212 intersected with the optical axis 211, one along the light
Cylinder 213 is arranged in the light source that axis 211 opens up and one is arranged in being all-trans between the light source setting cylinder 213 and light-emitting surface 212
Penetrate face 214.
The lens 21 and existing all lens all include an optical axis 211, and the optical axis 211 is for being arranged light source, i.e.,
LED32, while optical axis 211 is also the guiding of light path design, i.e., all optical textures are all using the optical axis as design guidance.
The light-emitting surface 212 is used to receive all emergent lights from the fully reflecting surface 214 with light source setting cylinder 213,
And these light projections are gone out.It is the mathematical design model schematic of the light-emitting surface 212 shown in institute Fig. 3.The light-emitting surface
212 be two elliptical intersecting areas, is dash area in Fig. 3.Described two oval have an equal length and be overlapped
The short axle CD and C ' D ' of major axis A B and different length.Described two elliptical dash areas be the short axle C ' D ' place ellipse with
The union of the half of the oval supplementary set in the ellipse where the short axle CD at the place the short axle C ' D ', i.e., because of short axle CD
Length be greater than short axle C ' D ' length, so the short axle CD can be referred to as major and minor axis, and short axle C ' D ' can be referred to as
Short axis.Therefore, ellipse of the intersecting area where short axis is with the ellipse where short axis ellipse where major and minor axis
The union of the half of supplementary set in circle.In order to control the light-emitting surface 212 outgoing beam beam width (beam width),
To form the hot spot of controllable size in plane of illumination, multiple hexagons interconnected are provided on the light-emitting surface 212
Micro- spherical lens, as shown in Figure 5.A, Fig. 6 B referring to Figure 6 together, Fig. 6 A are partial enlarged view of the Fig. 4 at A.Fig. 6 B is Fig. 5
The top view of the micro- spherical lens of hexagon at B.Fig. 6 A shows the spherical radius of each spherical lens, i.e. curvature R, with
And sagitta h, Fig. 6 B of the spherical surface arc show each hexagonal opposite side distance L.It can by changing R, h and L
Change the beam width of the micro- spherical lens of each hexagon.For example, working as R=3.0mm, when h=0.1mm, L=1.33mm, gained
To the beam width of the micro- spherical lens of hexagon will be one 12 degree to 17 degree of beam width.As R=2.0mm, h=
When 0.2mm, L=1.51mm, the beam width of the obtained micro- spherical lens of hexagon will be one 20 degree to 24 degree of beam
Width.As R=3.0mm, h=0.5mm, L=3.0mm, the beam width of the obtained micro- spherical lens of hexagon will be one
25 degree to 30 degree of beam width.
The light source setting cylinder 213 is for being arranged light source, such as LED, or other light sources, such as fluorescent lamp.In this reality
It applies in example, the light source is LED.It is envisioned that when other light sources such as fluorescent lamp and lens 21 dimension scale and LED with
When the dimension scale of lens 21 is suitable, then fluorescent lamp can be used also as light source, equally can achieve the present invention to be reached
The technical effect arrived.As shown in figure 4, the light source setting cylinder 213 includes a cylinder side wall 2131 and a top 2132.
Fully reflecting surface 214 described in the emergent light directive of the cylinder side wall 2131, and light-emitting surface 212 is reflected towards then through fully reflecting surface 214
It projects.The emergent light at the top 2132 is largely emitted directly toward light-emitting surface 212, forms optically focused, the top in order to prevent
2132 be a cylindroid.The central axis of the cylindroid intersects and vertical with optical axis 211, while in the light direction along lens 21
On curvature be positive camber.The radial diameter of the cylindroid can be equal with the light source setting diameter of cylinder 213 or be greater than described
The diameter of light source setting cylinder 213.In the present embodiment, the diameter phase of the radial diameter of the cylindroid and light source setting cylinder 213
Deng.When the light source setting cylinder 213 top 2132 be designed to cylindroid, be conducive to spread the light from following LED32, from
And can be concentrated on to avoid illumination at one, intermediate bright, the dark effect of surrounding is formed, achievees the purpose that uniform illumination.
The fully reflecting surface 214 is used to all reflect away the light received according to total reflection law, is arranged in light source
It is arranged between cylinder 213 and light-emitting surface 212, so that the lens 21 form a pyramidal structure.The shape of the fully reflecting surface 214
Shape is determined by shape, the size of light-emitting surface 212.And the depth and diameter of light source setting cylinder 213 will be according to fully reflecting surfaces
Shape designs.In short, the light that all fully reflecting surfaces 214 should be made to receive all reflects away, and it is filled into entire light-emitting surface
In 212.In figure 4, it can be seen that on the section along the optical axis 211, one end of the contour line of the fully reflecting surface 214 with
Light-emitting surface 212 connects, and the other end is connect with the cylinder side wall 2131 of light source setting cylinder 213, all from light source so as to receive
The light that cylinder 213 is issued is set.
The mounting portion 22 is used to for the lens 21 being installed to the shortest a line of the wedge-shaped light output groove 11,
Including there are two threaded holes (not to indicate).The mounting portion 22 and lens 21 are installed to shell 10 by two threaded holes
On.The mounting portion 22 can be integrally formed with the lens 21, in the present invention, convenient only for diagram, and individually give
The structural schematic diagram of the lens 21 out, as shown in Figure 2.
As shown in Figure 1, the illuminating module 30 includes a circuit board 31 and at least one is arranged in the circuit board 31
On LED light 32.The circuit board 31 can be printed circuit board (Printed Circuit Board, PCB), be arranged thereon
There are circuit or other electronic components, such as diode, triode to supply the specified electric current of LED light 32 or control signal.Institute
Stating LED (Light Emitting Diode) 32 is a kind of solid state semiconductor devices that can convert electrical energy into visible light,
It can directly convert electricity to light energy.On the optical axis 211 for being centrally disposed in lens 21 of the LED32.
When installing the shell 10 with lens group 20, it is preferred that should be in the cross section of the wedge-shaped light output groove 11
On, the optical axis 211 of the lens 21 is parallel with the wedge-shaped longest a line of light output groove 11, as shown in Figure 7.To both may be used
To control light direction, and the shell can be prevented light-blocking, because optical axis 211 is the guiding of light path design.
Compared with prior art, the present invention is since the light-emitting surface 212 of the lens 21 is by two elliptical intersecting areas
It constitutes, which is that the ellipse of the short axle of the long axis and different length by two with equal length is formed, and lens 21
Optical axis 211 and the light-emitting surface 212 it is also vertical, while for be arranged the lens 21 shell 10 have a wedge shape go out light
Slot 11, so that the hot spot for the greatest extent farthest projecting the LED ground footlight 100 forms a strip, to reach regular hot spot
The purpose of shape.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Mind and the interior made any modifications, equivalent replacements, and improvements of principle etc., should all be included in the protection scope of the present invention.