CN104214670A - Lamp and lens thereof - Google Patents

Abstract

The invention provides a lens which comprises a first light incoming surface, a second light incoming surface and a light outgoing surface, wherein the first light incoming surface and the second light incoming surface are concave curved surfaces, the light outgoing surface is a convex curved surface, when a light source is arranged on the lens, a first light beam of light emitted by the light source is refracted to the light outgoing surface through the first light incoming surface and then refracted out through the light outgoing surface to form a first light beam, a second light beam of light emitted by the light source is refracted to the light outgoing surface through the second light incoming surface and then refracted out through the light outgoing surface to form a second light beam, wherein an included angle between the first light beam and a central axis of the light source is within a range of plus or minus 70 degrees, and an included angle between the second light beam and the central axis of the. The invention also provides a lamp. According to the lamp and the lens, the first light incident surface, the second light incident surface and the light emergent surface are utilized to refract light emitted by the light source and irradiate the light within a range required by a user, so that waste of light energy is avoided.

Description

Lamps and their lenses

technical field

The invention relates to the lighting field, in particular to a lamp and a lens thereof.

Background technique

At present, with the maturity of light-emitting diode chips and packaging technology, the brightness requirements of light-emitting diodes are sufficient to meet the needs of various lighting fields. Therefore, light emitting diodes are widely used in various fields. In specific application fields, in order to comply with industry or national standards in this field, secondary optical design for light-emitting diode applications is required. In the secondary optical design for the application of light-emitting diodes, due to the light-emitting angle of the light-emitting diodes, most of the light from the light-emitting diodes is directly irradiated without passing through the reflector, and fails to irradiate the range required by the user, resulting in light energy loss.

Contents of the invention

The object of the present invention is to provide a lamp and a lens thereof capable of forming rectangular light spots with uniform illuminance and color.

In order to solve the above technical problems, the present invention provides a lens, which is used in a lamp to cover a light source of the lamp and distribute light emitted by the light source to form a rectangular light spot. The lens includes a first light incident surface, a second light incident surface and a light exit surface, the first light incident surface and the second light incident surface are concave curved surfaces, and the light exit surface is a convex curved surface, when the When the light source is placed on the lens, the first beam of light emitted by the light source is refracted from the first light incident surface to the light exit surface, and then refracted through the light exit surface to form the first light beam, so The second beam of light emitted by the light source is refracted from the second light incident surface to the light exit surface, and then refracted from the light exit surface to form a second light beam, wherein the first light beam and the light source The included angle between the central axes of the light source is within the range of plus or minus 70 degrees, and the included angle between the second light beam and the central axis of the light source is within the range of plus or minus 35 degrees.

Wherein, the lens is further provided with a housing space for housing the light source, and the first light incident surface and the second light incident surface are inner surfaces of the housing space.

Wherein, the lens further includes a bottom wall, and the accommodating space extends from the bottom wall to the light-emitting surface.

Wherein, the bottom surface and the outer surface of the bottom wall are embossed surfaces.

Wherein, the first light incident surface, the second light incident surface and the light exit surface are ellipsoidal free-form surfaces.

Wherein, the curve forming the free-form surface is a spline curve.

Wherein, the lens is a refracting lens, and the material of the lens is a plastic material with high light transmittance.

Wherein, the lens is an axisymmetric structure and is ellipsoidal.

The present invention also provides a lamp, comprising a light source and the above-mentioned lens, the lens is used to cover the light source and distribute the light beam emitted by the light source.

Wherein, the light source is a Lambertian light emitting diode.

In the lamp and lens provided by the present invention, the included angle between the first light beam formed by refracting the light beam emitted by the light source and the central axis of the light source by using the first light incident surface and the light output surface is within the range of plus or minus 70 degrees , and the angle between the second light beam formed by refracting the light beam emitted by the light source on the second light incident surface and the light output surface and the central axis of the light source is within the range of plus or minus 35 degrees, so that the light beam emitted by the light source can be The irradiation is within the range required by the user, thus avoiding the waste of light energy.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings used in the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. Technical personnel can also obtain other drawings based on these drawings without paying creative labor.

Fig. 1 is a three-dimensional schematic diagram of a lens provided by a preferred embodiment of the present invention;

Fig. 2 is a schematic plan view of the lens shown in Fig. 1;

Fig. 3 is a schematic sectional view along line III-III in Fig. 2;

Fig. 4 is a schematic sectional view along line IV-IV in Fig. 2;

Fig. 5 is a schematic diagram of the relationship between the incident ray, the outgoing ray and the normal of the lens shown in Fig. 1;

Fig. 6 is a light path diagram of the first light beam of the lamp;

Fig. 7 is a light path diagram of the second light beam of the lamp;

Fig. 8 is an illumination effect diagram of a lamp; and

Fig. 9 is a light distribution curve diagram of a lamp.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

Referring to FIG. 1 and FIG. 5 , a preferred embodiment of the present invention provides a lamp 100 . The lamp 100 includes a light source 10 and a lens 20 . The lens 20 is used to cover the light source 10 and distribute the light beam emitted by the light source 10 .

In this embodiment, the light source 10 is a Lambertian light emitting diode, and the lens 20 is a refractive lens.

Please refer to FIGS. 2 to 4 at the same time. The lens 20 includes a first light incident surface 22, a second light incident surface 24 and a light exit surface 28. The light exit surface 28 is a convex curved surface. The first light incident surface 22 and the second light entrance surface The light surface 24 is a concave curved surface. The light emitted by the light source 10 enters the interior of the lens 20 through the first light incident surface 22 and the second light incident surface 24 , and exits through the light exit surface 28 .

In this embodiment, the lens 20 has an axisymmetric structure and is approximately ellipsoidal, so that the light-emitting surfaces 28 are all ellipsoidal. The material of the lens 20 is plastic material with high light transmittance, such as acrylic material.

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

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}}$

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}}$

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}}$

N=N _x i+N _y j+N _z k;

A=A _x i+A _y j+A _z k;A'=B _x i+B _y j+B _z k;

Among them, N is the normal vector, A is the incident ray vector, A' is the outgoing ray vector, X is the coordinate in the X direction, Y is the coordinate in the Y direction, and Z is the coordinate in the Z direction, calculated. During the calculation, the curved surface of the lens 20 and the target spot are divided into equal grids in the horizontal and vertical directions, and according to the Snell law of the incident light and the outgoing light, the nodes of the grid are corresponding one by one, and the entire surface controls the grid nodes Coordinates are found by iterative calculations.

As shown in Fig. 1, Fig. 3 and Fig. 4, as a further improvement of the present invention, the lens 20 is also provided with a housing space 21 and a bottom wall 23, and the housing space 21 extends from the middle of the bottom wall 23 to the light-emitting surface 28 without through the light-emitting surface 28 .

In this embodiment, both the first light incident surface 22 and the second light incident surface 24 are inner surfaces of the accommodation space 21 , and the light source 10 is accommodated in the accommodation space 21 .

The bottom surface and the outer surface of the bottom wall 23 are embossed surfaces to prevent the light emitted by the light source 10 from exiting from the bottom surface and the outer surface of the bottom wall 23 to enhance the utilization rate of the light source.

In this embodiment, the receiving space 21 is substantially ellipsoidal, so the first light incident surface 22 and the second light incident surface 24 are ellipsoidal surfaces.

In this embodiment, in order to describe aspects, the light incident surface of the lens 20 is defined as the first light incident surface 22 and the second light incident surface 24, in fact the first light incident surface 22 and the second light incident surface 24 are the same The shape of a surface in different directions. As shown in FIG. 3 , it is a cross-sectional view of the lens 20 in the Y direction, and the second light incident surface 24 is the shape of the light incident surface in the Y direction. Wherein, the Y direction is the broad side of the rectangular spot. As shown in FIG. 4 , it is a cross-sectional view of the lens 20 in the X direction, and the first light incident surface 22 has the shape of the light incident surface in the X direction. Wherein, the X direction is the long side of the rectangular spot.

Please refer to FIG. 6 and FIG. 7 at the same time. When the light source 10 is placed in the housing space 21 of the lens 20, the first beam of light emitted by the light source 10 is refracted to the first light incident surface 22 to the The light-emitting surface 28 is refracted through the light-emitting surface 28 to form a first light beam; the second light beam of the light emitted by the light source 10 is refracted to the light-emitting surface 28 through the second light-emitting surface 24, and then Refracted by the light exit surface 28 to form a second light beam, wherein the angle between the first light beam and the central axis of the light source 10 is within the range of plus or minus 70 degrees, and the second light beam and The included angle between the central axes of the light sources 10 is within the range of plus or minus 35 degrees.

Because the light emitted by the light source 10 is refracted from the first light incident surface 22 to the light exit surface 28, and then refracted by the light exit surface 28, the angle between the first light beam formed and the central axis of the light source 10 is Within the range of plus or minus 70 degrees, at the same time, the light emitted by the light source 10 is refracted from the second light incident surface 24 to the light exit surface 28, and then refracted by the light exit surface 28 to form a second light beam that is identical to the light exit surface 28. The angle between the central axes of the light sources 10 is within the range of plus or minus 35 degrees, so that the light emitted by the light source 10 forms a rectangular spot after being distributed by the lens 20, and the light emitted by the light source 10 can be irradiated after being distributed by the lens 20. Within the range required by the user, the waste of light energy is avoided.

As a further improvement of the present invention, the first light incident surface 22 , the second light incident surface 24 and the light exit surface 28 are all free-form surfaces, and the curves forming the free-form surfaces are spline curves. In other words, both the light incident surface and the light exit surface 28 of the lens 20 are free-form surfaces, and the curves forming the free-form surfaces are spline curves.

Because the light-incident surface and the light-exit surface 28 of the lens 20 are both free-form surfaces, and the curve forming the free-form surface is a spline curve, that is, the light-incident surface and the light-exit surface 28 are formed by countless spline curves, thus the light source 10 The light spot formed after the emitted light passes through the light distribution of the lens 20 is formed by overlapping multiple micro-spots formed by projecting the light emitted by the light source 10 onto the same area of the illuminated surface through a plurality of spline curves. Increased spot illumination and color uniformity.

Please continue to refer to FIG. 8 , a Lambertian LED is installed in the receiving space 21 of the lens 20 . It can be seen from the simulation that after the light distribution of the Lambertian light-emitting diode is carried out through the lens 20, a rectangular light spot is formed at the test position 2 meters away.

Please continue to refer to FIG. 9 , a Lambertian LED is installed in the receiving space 21 of the lens 20 . It can be seen from the simulation that after the light emitted by the Lambertian light emitting diodes is distributed through the lens 20, the light intensity does not overlap, so the light spot formed on the illuminated surface is not a circle but a rectangular light spot.

The above description is a preferred embodiment of the present invention, and it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the 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.