CN104214670A - Lamp and lens thereof - Google Patents

Abstract

The invention provides a lens. The lens comprises a first light inlet face, a second light inlet face and a light outlet face. The first light inlet face and the second light inlet face are inwards-concaved curved surfaces, and the light outlet face is an outwards-convex curved surface. When a light source is arranged on the lens, a first light beam of light emitted by the light source passes through the first light inlet face, is refracted to the light outlet face and then is refracted out through the light outlet face to form the first light beam, and a second light beam of the light emitted by the light source passes through the second light inlet face, is refracted to the light outlet face and then is refracted out through the light outlet face to form the second light beam. The inclined angle between the first light beam and the center axis of the light source ranges from -70 degrees to 70 degrees, and the included angle between the second light beam and the center axis of the light source ranges from -35 degrees to 35 degrees. The invention further provides a lamp. According to the lamp and the lens, the light emitted by the light source can irradiate the range needed by a user after being refracted through the first light inlet face, the second light inlet face and the light outlet face, and therefore the waste of light energy is avoided.

Description

Light fixture and lens thereof

Technical field

The present invention relates to lighting field, particularly relate to a kind of light fixture and lens thereof.

Background technology

At present along with the maturation of light-emitting diode chip for backlight unit and packaging technology, light-emitting diode luminance requires to be enough to the demand meeting each lighting field.Therefore, light emitting diode is widely used in every field.In embody rule field, for meeting industry or the national standard in this field, need to carry out secondary optical design to light emitting diode application.And in the secondary optical design carrying out light emitting diode application, due to the reason of the lighting angle of light emitting diode, most of light of light emitting diode without reflector direct irradiation go out, and fail the scope that is irradiated to needed for user, thus cause luminous energy loss.

Summary of the invention

The object of the present invention is to provide a kind of light fixture and the lens thereof that can form illumination and the uniform rectangular light spot of color.

In order to solve the problems of the technologies described above, the invention provides a kind of lens, be applied in light fixture, to cover the light source of described light fixture and to carry out luminous intensity distribution, to form rectangular light spot to the light that described light source sends.Described lens comprise the first incidence surface, second incidence surface and exiting surface, described first incidence surface and described second incidence surface are inner sunken face, described exiting surface is convex outward, when described light source is placed in described lens, first light beam of the light that described light source sends refracts to described exiting surface by described first incidence surface, reflected by described exiting surface again, thus form the first light beam, second light beam of the light that described light source sends refracts to described exiting surface by described second incidence surface, reflected by described exiting surface again, thus form the second light beam, wherein, angle between described first light beam and the central shaft of described light source is in the scope of positive and negative 70 degree, angle between described second light beam and the central shaft of described light source is in the scope of positive and negative 35 degree.

Wherein, described lens are also provided with receiving space, and for accommodating described light source, described first incidence surface and described second incidence surface are the inner surface of described receiving space.

Wherein, described lens also comprise diapire, and described receiving space extends from described diapire to described exiting surface.

Wherein, the bottom surface of described diapire and lateral surface are etched surface.

Wherein, described first incidence surface, described second incidence surface and described exiting surface are the free form surface of elliposoidal.

Wherein, the curve forming described free form surface is SPL.

Wherein, described lens are refractive lenses, and the material of described lens is the plastic cement material of high transmission rate.

Wherein, described lens are axially symmetric structures, and are ellipsoid shape.

The present invention also provides a kind of light fixture, comprises light source and said lens, and described lens are for covering described light source and carrying out luminous intensity distribution to the light beam that described light source sends.

Wherein, described light source is lambert's type light emitting diode.

Light fixture provided by the invention and lens, angle between the first light beam that the light beam utilizing described first incidence surface and exiting surface to be sent by light source is formed after superrefraction and the central shaft of light source is in the scope of positive and negative 70 degree, and the angle between the second light beam of being formed after superrefraction of the light beam that sent by light source of described second incidence surface and exiting surface and the central shaft of light source is in the scope of positive and negative 35 degree, thus the light beam that light source sends can be radiated in the scope needed for user, and then avoid the waste of luminous energy.

Accompanying drawing explanation

In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the schematic perspective view of the lens that better embodiment of the present invention provides;

Fig. 2 is the floor map of the lens shown in Fig. 1;

Fig. 3 is the cross-sectional schematic of linearly III-III in Fig. 2;

Fig. 4 is the cross-sectional schematic of linearly IV-IV in Fig. 2;

Fig. 5 is the schematic diagram of relation between the incident ray of the lens shown in Fig. 1, emergent ray and normal three;

Fig. 6 is the index path of the first light beam of light fixture;

Fig. 7 is the index path of the second light beam of light fixture;

Fig. 8 is the radiation response figure of light fixture; And

Fig. 9 is the distribution curve flux figure of light fixture.

Detailed description of the invention

Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is clearly and completely described.

Refer to Fig. 1 and Fig. 5, better embodiment of the present invention provides a kind of light fixture 100.Described light fixture 100 comprises light source 10 and lens 20.Described lens 20 are for covering described light source 10 and carrying out luminous intensity distribution to the light beam that described light source 10 sends.

In the present embodiment, light source 10 is lambert's type light emitting diode, and lens 20 are refractive lenses.

Please refer to Fig. 2 to Fig. 4, described lens 20 comprise the first incidence surface 22, second incidence surface 24 and exiting surface 28, and exiting surface 28 is convex outward, and the first incidence surface 22 and the second incidence surface 24 are inner sunken face.The light that light source 10 sends is inner from entering lens 20 through the first incidence surface 22 and the second incidence surface 24, and penetrates through exiting surface 28.

In the present embodiment, described lens 20 are axially symmetric structures, and are roughly ellipsoid shape, thus exiting surface 28 is ellipsoid.The material of described lens 20 is the plastic cement material of high transmission rate, as acrylic material.

As shown in Figure 5, lens 20 of the present invention are according to formula:

$N_x=\frac{A_x-B_x}{\sqrt{2}\sqrt{\left|A\right|-A\·A^{\′}}}$

$N_y=\frac{A_y-B_y}{\sqrt{2}\sqrt{\left|A\right|-A\·A^{\′}}}$

$N_z=\frac{A_z-B_z}{\sqrt{2}\sqrt{\left|A\right|-A\·A^{\′}}}$

N=N _xi+N _yj+N _zk;

A=A _xi+A _yj+A _zk;A’=B _xi+B _yj+B _zk;

Wherein, N is normal vector, and A is incident ray vector, and A ' is emergent ray vector, and X is the coordinate of X-direction, and Y is the coordinate of Y-direction, and Z is the coordinate of Z-direction, calculates.During calculating, by lens 20 curved surface and target hot spot at the horizontal and vertical grid being divided into equivalent, according to incident ray and emergent ray Si Nieer (snell) law, by the node one_to_one corresponding of grid, whole curved surface control mesh node coordinate is obtained by iterative computation.

As shown in Figure 1, Figure 3 and Figure 4, as a further improvement on the present invention, described lens 20 are also provided with receiving space 21 and diapire 23, and receiving space 21 extends from the centre of diapire 23 to exiting surface 28 but do not run through exiting surface 28.

In the present embodiment, the first incidence surface 22 and the second incidence surface 24 are the inner surface of receiving space 21, and light source 10 is contained in receiving space 21.

The bottom surface of diapire 23 and lateral surface are etched surface, the light sent to prevent light source 10 from the bottom surface of diapire 23 and lateral surface injection, to strengthen the utilization rate of light source.

In the present embodiment, receiving space 21 is roughly ellipsoid shape, thus the first incidence surface 22 and the second incidence surface 24 are ellipsoid.

In the present embodiment, in order to describe aspect, the incidence surface of lens 20 is defined as the first incidence surface 22 and the second incidence surface 24, in fact the first incidence surface 22 and the second incidence surface 24 are the shape of same curved surface at different directions.As shown in Figure 3, be lens 20 sectional view in the Y direction, the second incidence surface 24 is incidence surface shape in the Y direction.Wherein, Y-direction is the broadside of rectangular light spot.As shown in Figure 4, for lens 20 are at the sectional view of X-direction, the first incidence surface 22 is the shape of incidence surface X-direction.Wherein, X-direction is the long limit of rectangular light spot.

Please also refer to Fig. 6 and Fig. 7, when described light source 10 is placed in the receiving space 21 of described lens 20, first light beam of the light that described light source 10 sends refracts to described exiting surface 28 by described first incidence surface 22, then is reflected by described exiting surface 28, thus forms the first light beam; Second light beam of the light that described light source 10 sends refracts to described exiting surface 28 by described second incidence surface 24, reflected by described exiting surface 28 again, thus form the second light beam, wherein, angle between described first light beam and the central shaft of described light source 10 is in the scope of positive and negative 70 degree, and the angle between described second light beam and the central shaft of described light source 10 is in the scope of positive and negative 35 degree.

The light sent because of light source 10 refracts to described exiting surface 28 by the first incidence surface 22, after being reflected by described exiting surface 28 again, angle between the first light beam formed and the central shaft of described light source 10 is in the scope of positive and negative 70 degree, simultaneously, the light that light source 10 sends refract to described exiting surface 28 by described second incidence surface 24, after being reflected by described exiting surface 28 again, angle between the second light beam formed and the central shaft of described light source 10 is in the scope of positive and negative 35 degree, thus the light that light source 10 sends forms rectangular light spot after lens 20 luminous intensity distribution, and the light that light source 10 sends can be radiated in the scope needed for user after lens 20 luminous intensity distribution, and then avoid the waste of luminous energy.

As a further improvement on the present invention, the first incidence surface 22, second incidence surface 24 and exiting surface 28 are free form surface, and the curve forming free form surface is SPL.In other words, incidence surface and the exiting surface 28 of lens 20 are free form surface, and the curve forming free form surface is SPL.

Because the incidence surface of lens 20 and exiting surface 28 are free form surface, and the curve forming free form surface is SPL, namely described incidence surface and exiting surface 28 are formed by countless SPLs, thus the hot spot that the light that light source 10 sends is formed after the luminous intensity distribution of lens 20, be formed through multiple SPL miniature luminous point overlap that the same region projected on face to be illuminated is formed by the light that light source 10 sends by multiple, further increase the illumination of hot spot and the uniformity of color.

Please continue to refer to Fig. 8, lambert's type light emitting diode is installed in the receiving space 21 of described lens 20.Known by analog simulation, after luminous intensity distribution being carried out to the light that described lambert's type light emitting diode sends by described lens 20, form a rectangular light spot at 2 meters of test positions far away.

Please continue to refer to Fig. 9, lambert's type light emitting diode is installed in the receiving space 21 of described lens 20.Known by analog simulation, after carrying out luminous intensity distribution by described lens 20 to the light that described lambert's type light emitting diode sends, light intensity is not overlapping, thus is not circular but rectangular light spot at the hot spot that face to be illuminated is formed.

The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.

Claims (10)

1. lens, be applied in light fixture, to cover the light source of described light fixture and to carry out luminous intensity distribution to the light that described light source sends, to form rectangular light spot, it is characterized in that: described lens comprise the first incidence surface, second incidence surface and exiting surface, described first incidence surface and described second incidence surface are inner sunken face, described exiting surface is convex outward, when described light source is placed in described lens, first light beam of the light that described light source sends refracts to described exiting surface by described first incidence surface, reflected by described exiting surface again, thus form the first light beam, second light beam of the light that described light source sends refracts to described exiting surface by described second incidence surface, reflected by described exiting surface again, thus form the second light beam, wherein, angle between described first light beam and the central shaft of described light source is in the scope of positive and negative 70 degree, angle between described second light beam and the central shaft of described light source is in the scope of positive and negative 35 degree.

2. lens according to claim 1, is characterized in that, described lens are also provided with receiving space, and for accommodating described light source, described first incidence surface and described second incidence surface are the inner surface of described receiving space.

3. lens according to claim 2, is characterized in that, described lens also comprise diapire, and described receiving space extends from described diapire to described exiting surface.

4. lens according to claim 3, is characterized in that, the bottom surface of described diapire and lateral surface are etched surface.

5. lens according to claim 2, is characterized in that, described first incidence surface, described second incidence surface and described exiting surface are the free form surface of elliposoidal.

6. lens according to claim 5, is characterized in that, the curve forming described free form surface is SPL.

7. lens according to claim 1, is characterized in that, described lens are refractive lenses, and the material of described lens is the plastic cement material of high transmission rate.

8. lens according to claim 6, is characterized in that, described lens are axially symmetric structures, and are ellipsoid shape.

9. a light fixture, comprises light source and the lens as described in any one of claim 1-8, and described lens are for covering described light source and carrying out luminous intensity distribution, to form rectangular light spot to the light beam that described light source sends.

10. light fixture according to claim 9, is characterized in that, described light source is lambert's type light emitting diode.