CN103982855B - lens and light-emitting device - Google Patents

Abstract

The invention provides a lens and a light-emitting device. The first lens body is provided with a bottom surface, a light incident surface and a peripheral side surface, wherein the peripheral side surface is a first light emergent surface, and the light incident surface is arranged in the middle; the second lens body is connected with the top surface of the first lens body, the top surface is a total reflection surface in a smooth curved surface shape, and the peripheral side surface is a second light-emitting surface in a smooth curved surface shape; the reflecting film is arranged in the central area of the total reflection surface and used for covering the hot point. The incident light is divided into two parts to be emitted, and the first part is emitted from the first light emitting surface to form a plurality of first emergent light; the second part is reflected by the second lens body, the reflecting film and the total reflection surface and then emitted from the second light emitting surface to form a plurality of second emergent rays, the plurality of first emergent rays are respectively inclined upwards relative to the bottom surface, and the plurality of second emergent rays are respectively inclined downwards relative to the bottom surface. The light-emitting device comprises a lens and an LED surface light source.

Description

Lens and light emitting device

technical field

The invention relates to a lens and a light-emitting device, in particular to a lens and a light-emitting device suitable for ultra-thin and large-size direct-lit backlight modules.

Background technique

The backlight module of the liquid crystal display panel can be divided into a side-type backlight module and a direct-type backlight module according to the structure of the light source. The structure of the side-facing backlight module is to place the LED on the side of the panel, use a wedge-shaped light guide plate and a reflector to guide the light upward, and then pass through the optical system composed of a diffuser and a diamond lens to make the light uniform. In the direct-lit backlight module, the LED array is directly placed under the diffuser plate, and the light passes through the liquid crystal switch in a direct way. The two designs have their own advantages and disadvantages. The backlight source in the edge-lit backlight module is limited by the number of LEDs, and the brightness and luminance are poor. It is a low-cost monitor panel. The direct-lit backlight module can provide higher brightness and luminance because it can use more sets of light sources, but relatively higher operating temperature, so it was often used in large-size LCD TVs in the past. However, with the popularity of full HD, the size and specification requirements of LCD panels are getting higher and higher, such as color gamut, brightness, contrast, viewing angle, etc. To adapt to the trend of large-scale LCD panels, direct-lit LED backlight modules have become the focus of development at this stage. The challenge of using LED as a direct-lit backlight is mainly that the traditional lens has poor light uniformity and low luminous efficiency due to its single shape, requires a large light mixing distance and has defects such as hot spots, and is difficult to apply to direct-lit backlight modules, especially ultra-thin. Large size direct type backlight module.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the above-mentioned prior art, and provide a lens and a light-emitting device that emit light uniformly and are suitable for an ultra-thin large-size direct-lit backlight module.

To achieve the above object, the present invention adopts the following technical solutions:

The invention provides a lens, which includes a first lens body, a second lens body and a reflection film. Wherein the first lens body has a bottom surface and a light incident surface in the shape of a smooth curved surface concaved from the bottom surface, the peripheral side surface is the first light exit surface, and the light incident surface is set in the center; the second lens body is cylindrical , connected to the top surface of the first lens body, the top surface of the second lens body is a smooth curved total reflection surface, the peripheral side surface is a smooth curved second light-emitting surface, and the center of the total reflection surface Corresponding to the center of the light-incident surface; a reflective film, disposed on the central area of the total reflection surface, for covering hot spots. The incident light that enters the lens from the light-incident surface is divided into two parts and exits. The first part is emitted from the first light-exit surface to form several first exit rays; the second part passes through the second lens body and the reflective film. After being reflected by the total reflection surface, several second outgoing rays are emitted from the second light-emitting surface, and the several first outgoing rays are respectively inclined upward by 0°~60° relative to the bottom surface, and the several first outgoing rays The two exiting rays are respectively inclined downward by 0°-80° relative to the bottom surface.

According to an embodiment of the present invention, the plurality of first outgoing rays are respectively inclined upward by 0°-10° relative to the bottom surface.

According to an embodiment of the present invention, the plurality of second outgoing light rays are respectively inclined downward by 0°-20° relative to the bottom surface.

According to an embodiment of the present invention, in the direction along the bottom surface and the top surface of the first lens body, the distance between the center point of the light incident surface and each point of the first light exit surface becomes gradually smaller.

According to an embodiment of the present invention, the edge of the top surface of the first lens body and the edge of the top surface of the second lens body are on the same side wall of the cone with the center of the light incident surface as the apex.

According to an embodiment of the present invention, the cone is a cone with a cone angle of 30°-160°, the second part of incident light is distributed within the range of the cone angle, and the first part of incident light is distributed within The range between the side wall of the conical cylinder and the bottom surface of the first lens body is preferably 80°-130°.

According to an embodiment of the present invention, the projected area of the reflective film on the bottom surface of the first lens body is 1 to 10 times the projected area of the light incident surface on the bottom surface of the first lens body, preferably 2 ~5 times.

According to an embodiment of the present invention, the first lens body and the second lens body are made of the same material and are integrally structured.

According to an embodiment of the present invention, the first lens body and the second lens body have a common center line of symmetry.

According to an embodiment of the present invention, the reflective film is an aluminum-plated film or a silver-plated film.

According to an embodiment of the present invention, the total reflection surface is provided with several corrugations, and two adjacent corrugations intersect to form sharp peaks.

According to an embodiment of the present invention, the light incident surface is spherical.

According to an embodiment of the present invention, the cross-section of the second light-emitting surface is circular or oval; the longitudinal section of the second light-emitting surface is rectangular or trapezoidal.

According to an embodiment of the present invention, the second light-emitting surface is inwardly concave or outwardly convex relative to the centerline of the second lens body.

According to an embodiment of the present invention, the upper half and/or the lower half of the second light-emitting surface has a plurality of ring-shaped corrugations.

The invention provides a light emitting device, which includes a lens and a light source. Wherein the lens is the lens of the present invention, and the light source is an LED light-emitting chip surface light source.

It can be seen from the above technical solutions that the advantages and positive effects of the present invention are that the lens includes two parts of the body and has a total reflection surface. The incident light entering the lens is divided into two parts, respectively emitted from the first light-emitting surface on the side of the first lens body and the second light-emitting surface on the side of the second lens body. Moreover, the two parts of outgoing light are inclined towards the middle direction, that is, the outgoing light from the first light-emitting surface is inclined downward, and the outgoing light from the second light-emitting surface is inclined upward. Therefore, after light distribution through the lens of the present invention, the light is evenly distributed on the side of the lens. In particular, in the present invention, since a reflective film is provided at the center of the total reflection surface where hot spots are likely to be formed, the appearance of hot spots is avoided, the uniformity of light output is greatly improved, and the quality of the lens is guaranteed. The present invention comprehensively utilizes the wave characteristics and particle characteristics of light, and through the combined design of the light incident surface, the first light exit surface, the second light exit surface and the total reflection surface, provides uniform light exit within a very short coupling distance, and is especially suitable for For ultra-thin and large-size direct-lit backlight modules. At the same time, in the lens of the present invention, on the basis of ensuring uniform light output, the number of refraction and reflection of light is minimized, thereby reducing energy loss of the lens body.

The lens of the present invention is particularly suitable for surface light sources, such as LED light-emitting chip surface light sources. Therefore, the light-emitting device composed of the lens of the present invention and the LED light-emitting chip surface light source also has the characteristics of uniform light output and high energy.

The above and other objects, features and advantages of the present invention will be more apparent through the following description of preferred embodiments with reference to the accompanying drawings.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of lens of the present invention;

Fig. 2 is an enlarged view of part A in Fig. 1;

Fig. 3 is the enlarged view of the total reflection surface of part A in Fig. 1, represents the schematic diagram of the actual shape and the designed shape difference of the total reflection surface central part in the present invention;

4a to 4g show schematic diagrams of various shapes of the second light-emitting surface in the present invention;

Fig. 5 represents the partial enlarged view of total reflection surface among the present invention;

Fig. 6 shows the light distribution schematic diagram of the lens of the present invention;

Fig. 7 shows that the lens of the present invention is used for the illuminance simulation line diagram of the ultra-thin large-size direct-lit backlight module;

Fig. 8 shows a simulated grating diagram of illuminance directly above the lens when the lens of the present invention is used in an ultra-thin large-size direct-lit backlight module.

Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are for illustration only, and are not intended to limit the present invention.

detailed description

See Figure 1. The lens of the present invention includes a first lens body 1 , a second lens body 2 and a reflection film 3 .

The first lens body 1 has a bottom surface 10 , a top surface opposite to the bottom surface 10 , and a peripheral side surface connecting the top surface and the bottom surface. The central position of the bottom surface 10 is recessed into the first lens body 1 to form a smooth curved light incident surface 11 , and the peripheral side surface is the first light exit surface 12 , which is in the shape of a smooth curved surface. Preferably, the light incident surface 11 is spherical, but not limited thereto.

The second lens body 2 is in the shape of a cylinder. Preferably, its radial dimension is 3-6 times larger than the axial dimension, forming an oblate cylinder shape, particularly preferably an oblate cylinder shape. The second lens body 2 has a top surface, a bottom surface 23 opposite to the top surface, and a peripheral side surface connecting the top surface and the bottom surface 23 . The area of the bottom surface 23 of the second lens body 2 is 1.5 to 5 times greater than the area of the top surface of the first lens body 1, and the bottom surface 23 of the second lens body 2 is connected to the top surface of the first lens body 1 at the central position, both It can be integrally formed from the same material and has a common central line of symmetry. Along the direction from the bottom surface 10 to the top surface of the first lens body 1 , the distance between the center point O of the light incident surface 11 and each point on the first light exit surface 12 gradually decreases.

See Figure 1 and Figures 4a-4g. The top surface of the second lens body 2 is a total reflection surface 21, and the total reflection surface 21 is a free-form surface, and light rays reaching this surface will undergo total reflection. The center of the total reflection surface 21 corresponds to the center O of the light incident surface 11 . The shape of the total reflection surface 21 may be similar to a conical surface whose generatrix is slightly concave inwards, but of course it is not limited thereto, as long as it can form a total reflection surface, other smooth curved surface shapes are also feasible. The peripheral surface of the second lens body 2 is the second light emitting surface 22 . The cross section of the second light emitting surface 22 (the plane parallel to the bottom surface 23 ) is circular, oval or other smooth curve shape. The longitudinal section of the second light-emitting surface 22 is rectangular (see FIG. 1 ) or trapezoidal (see FIG. 4a, FIG. 4b ); or the second light-emitting surface 22 is inwardly concave relative to the centerline of the second lens body 2 (see FIG. 4d ) or protrude outward (see FIG. 4c); further, the upper half of the second light-emitting surface 22 has multiple annular corrugations (see FIG. 4f), or the lower half has multiple annular corrugations (see FIG. 4g), Or the second light-emitting surface 22 has a plurality of ring-shaped corrugations as a whole (see FIG. 4e ). In short, the second light-emitting surface 22 can have various shapes.

See Figure 1, Figure 2 and Figure 3. The reflective film 3 is pasted on the central area of the total reflection surface 21 by means of vacuum plating or the like. The projected area of the reflective film 3 on the bottom surface 10 of the first lens body 1 is 1-10 times the projected area of the light incident surface 11 on the bottom surface 10 of the first lens body 1 . Preferably, the projected area of the reflective film 3 on the bottom surface 10 of the first lens body 1 is 2 to 5 times the projected area of the light incident surface 11 on the bottom surface 10 of the first lens body 1 . The reflective film 3 may be an aluminum-plated film or a silver-plated film or a film with a reflective function. The purpose of the reflective film 3 is to cover hot spots.

See Figures 2 and 3. In the design, there is a sharp point M in the center of the total reflection surface (that is, the position closest to the light incident surface 11), and theoretically 21' is the shape of the total reflection surface, as shown by the double-dot dash line in Figure 3. The incident light is reflected by the theoretical total reflection surface 21 ′, as shown by the dotted line in FIG. 3 . However, due to reasons such as lens processing and injection molding process, there is no way to keep the actual structure consistent with the designed ideal structure. The actual processed lens is arc-shaped in the center of the total reflection surface, that is, the actual shape of the total reflection surface 21 is arc. Therefore, according to the theoretically designed shape of the total reflection surface, all the incident light will be reflected, and it is not easy to pass through the total reflection surface; in the actual structure, there will be a small amount of incident light, especially the incident light in the center of the LED through On the total reflection surface, as shown by the thin solid line in Figure 3, the central light intensity of the LED is the largest, so this part of the transmitted light forms a central hot spot. In the present invention, a reflective film 3 is provided on the central area of the total reflection surface, thereby covering hot spots.

See Figure 6. AB is a surface light source for LED light-emitting chips, and the light emitted by it is incident light, and the incident light is divided into two parts after entering the lens from the light incident surface 11 and then emitted. The first part is emitted from the first light emitting surface 12 to form several first outgoing rays; Some of them are reflected by the second lens body 2 , the reflective film 3 and the total reflection surface 21 and then emitted from the second light exit surface 22 to form several second exit rays. Wherein several first outgoing rays are respectively inclined upwards by 0°~60° with respect to the bottom surface 10, preferably, several first outgoing rays are respectively inclined upwards by 0°~10° relative to the bottom surface 10, more preferably, 0° ~5°. The plurality of second outgoing rays are respectively inclined downwards by 0° to 80° relative to the bottom surface 10, preferably, the plurality of second outgoing rays are respectively inclined downwards by 0° to 20° relative to the bottom surface 10, more preferably, 0 °~10°.

See Figure 6. The edge of the top surface of the first lens body 1 and the edge of the top surface of the second lens body 2 are on the side wall of the same cone with the center O of the light incident surface 11 as the apex. Preferably, the cone is a cone, and its The cone angle β is 30°~160°, and the preferred cone angle β is 80°~130°. The second part of the incident light is distributed within the range of the cone angle β, and the first part of the incident light is distributed between the side wall of the cone and the first part. In the range between the bottom surface 10 of the lens body 1 .

The light-emitting device of the present invention includes the lens of the present invention and an LED light-emitting chip surface light source with a certain light-emitting area.

See Figure 6 again. The surface light source AB of the LED light-emitting chip has a certain area. Use the principle of boundary rays to design lenses for extended light sources. The light emitted from B is parallel after being totally reflected by the total reflection surface 21, and parallel after being refracted by the first light-emitting surface 12; the light emitted from O is totally reflected by the total reflection surface 21 and refracted by the second light-emitting surface 22. The light is emitted at an angle of θ1, refracted by the first light-emitting surface 12, and then emitted at an angle of +θ3; the light emitted from A, after being totally reflected by the total reflection surface 21 and refracted by the second light-emitting surface 22, is emitted at an angle of -θ2, and passed through After being refracted by the first light emitting surface 12, the light is emitted at an angle of +θ4. The sizes of θ1, θ2, θ3 and θ4 can be specifically determined by the size of the LED light-emitting chip, the first light-emitting surface 12 , the lens total reflection surface 21 and the second light-emitting surface 22 . For the design of the extended light source, all the light is emitted from the side after passing through the lens.

See Figures 5 and 6. The actual processed total reflection surface 21 objectively cannot be an absolutely smooth and perfect curved surface, as shown in FIG. 5 . The total reflection surface 21 is provided with several corrugations, and two adjacent corrugations intersect to form sharp peaks. This is the knife pattern formed when the total reflection surface 21 is processed. These knife patterns form a similar multi-slit diffraction surface grating, and d is the grating constant. The entire surface is divided into N parts according to the grating constant, and each part becomes a single-slit Fraunhofer diffraction. Since the single-slit diffraction fields are coherent, the complex amplitude of the multi-slit Fraunhofer is the superposition of all single slits. The determination of the grating constant d is determined by the tangent of the design curve at this point and the feed rate of the knife during cutting. Let P be a point in front of the lens, and the light intensity at point P is:

$\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}{\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; sin</span>}\frac{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; \&delta;</span>}}{\mathrm{<span\; class="notranslate">\; sin</span>}\frac{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

I ₀ =|A| ² I ₀ =|A| ² is the light intensity produced by the single slit at point P ₀ . The above formula contains two factors: single slit diffraction factor and the multibeam interference factor It shows that the multi-slit Fraunhofer diffraction is the result of the combined effect of diffraction and interference. The single slit diffraction factor is related to the properties of the single slit itself, including the slit width and the amplitude and phase changes caused by it. The multi-beam interference factor comes from the periodic arrangement of slits. Therefore, the intensity distribution of their Fraunhofer diffraction pattern can be obtained by calculating the diffraction factor of a single diffraction ring and multiplying it by the multi-beam interference factor.

The lens of the present invention is a side-out type secondary lens designed by using the fluctuation characteristics of light, and the lens is especially suitable for ultra-thin and large-size direct-type backlight modules, and can form a uniform irradiated surface under a very short coupling distance.

For example: the lens of the present invention is used in an ultra-thin large-size direct-lit backlight module, wherein the height of the lens, that is, the vertical distance between the bottom surface 10 of the first lens body 1 and the top surface of the second lens body 2, is 7.5 mm, and the top of the lens is 7.5 mm. surface (referring to the top surface of the second lens body 2) to the lower surface of the diffusion plate, that is, the coupling distance is 5.5 mm, and the total thickness of the ultra-thin large-size direct-type backlight module is 13 mm. The spatial light intensity distribution of the light emitted by the Lambertion LED light-emitting chip surface light source is:

I _θ = I _N cos θ

IN is the luminous intensity of the forward light _- emitting surface in the normal direction, that is, the maximum light intensity. Its luminance is the same in all directions, and the luminous flux emitted within the solid angle range of the plane aperture angle U is:

After comprehensive calculation of Fraunhofer diffraction and total reflection light distribution, the light emitted by the surface light source of the LED light-emitting chip within the range of the cone with a cone angle β of 124° is reflected by the total reflection surface 21 and emerges from the second light-emitting surface 22; The rest of the incident light is emitted from the first light emitting surface 12 . During machining, the cutter radius is 0.1mm-0.5mm, and the rotation speed is 1500rpm-2000rpm. The simulation results are shown in Fig. 7 and Fig. 8, and the uniformity is greater than 80%.

See Figures 7 and 8. Fig. 7 and Fig. 8 are illuminance simulation effect diagrams of the above examples. In Figure 7, the light-colored lines represent the horizontal illuminance, and the dark-colored lines represent the vertical illuminance. It can be seen from Figure 7 that the illuminance uniformity (the ratio of the minimum illuminance value to the maximum illuminance value) is greater than 80% in both the horizontal direction and the vertical direction. Fig. 8 shows the illuminance simulation grating diagram on the lower surface of the diffuser plate of the ultra-thin large-size direct-lit backlight module. The area of the picture on the left is roughly equivalent to the area of the diffusion plate, and the distribution of illuminance is represented by gray scale in the picture; the picture on the right shows the illuminance value corresponding to different gray scales. The entire figure 8 visually shows that the illuminance distribution on the lower surface of the diffuser plate is very uniform.

While this invention has been described with reference to a few exemplary embodiments, it is to be understood that the terms which have been used are words of description and illustration, rather than of limitation. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be construed broadly within the spirit and scope of the appended claims. , all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims (19)

1. lens, it is characterised in that including:

First lens body (1), it has bottom surface (10) and by putting down that described bottom surface (10) concave The incidence surface (11) of sliding curve form, all side surfaces are the first exiting surface (12), and described incidence surface (11) it is centrally located；

Second lens body (2), in bar shape, is connected to the end face of described first lens body (1), The fully reflecting surface that end face is smooth surface shape (21) of this second lens body (2), all side surfaces are Second exiting surface (22) of smooth surface shape, the center of described fully reflecting surface (21) is corresponding to described The center (O) of incidence surface (11)；

Reflectance coating (3), is only located at the central area of described fully reflecting surface (21), is used for covering focus, And it is not provided with reflectance coating (3) in other regions except described central area of described fully reflecting surface (21)；

Injected the incident ray of described lens by described incidence surface (11) and be divided into two parts outgoing, first Divide and formed some the first emergent raies by the injection of described first exiting surface (12)；Part II is through second By described second after lens body (2), described reflectance coating (3) and described fully reflecting surface (21) reflection Exiting surface (22) injection forms some the second emergent raies, and described some the first emergent raies are respectively Being inclined upwardly 0 °～60 ° relative to this bottom surface (10), described some the second emergent raies are the most relatively In this bottom surface (10) downward-sloping 0 °～80 °.

2. lens as claimed in claim 1, it is characterised in that described some the first emergent lights Line is respectively relative to this bottom surface (10) and is inclined upwardly 0 °～10 °.

3. lens as claimed in claim 1, it is characterised in that described some the second emergent lights Line is respectively relative to downward-sloping 0 °～20 ° of this bottom surface (10).

4. lens as claimed in claim 1, it is characterised in that along described first lens originally The bottom surface (10) of body (1) is to end face direction, and the central point (O) of described incidence surface (11) arrives Distance between described first exiting surface (12) each point tapers into.

5. lens as claimed in claim 4, it is characterised in that described first lens body (1) The top edge of top edge and described second lens body (2) same with described incidence surface (11) center (O) is on the cone cylinder sidewall on summit.

6. lens as claimed in claim 5, it is characterised in that described cone cylinder is taper cone barrel, and Its cone angle (β) is 30 °～160 °, and described Part II incident ray is distributed in this cone angle (β) In the range of, described Part I incident ray is distributed in the sidewall of described taper cone barrel and described first lens In the range of between the bottom surface (10) of body (1).

7. lens as claimed in claim 6, it is characterised in that described cone angle (β) is 80 ° ～130 °.

8. the lens as described in any one in claim 1-7, it is characterised in that described reflectance coating (3) Projected area in the bottom surface (10) of described first lens body (1) is that described incidence surface (11) is in institute State 1～10 times of projected area of the first lens body (1) bottom surface (10).

9. lens as claimed in claim 8, it is characterised in that described reflectance coating (3) is described the The projected area of the bottom surface (10) of one lens body (1) is described incidence surface (11) described first saturating 2～5 times of the projected area of mirror body (1) bottom surface (10).

10. lens as claimed in claim 1, it is characterised in that described first lens body (1) with The material of described second lens body (2) is identical, and is structure as a whole.

11. lens as claimed in claim 1, it is characterised in that described first lens body (1) with Described second lens body (2) has common centre symmetry line.

12. lens as claimed in claim 1, it is characterised in that described reflectance coating (3) is aluminizer Or silver-plated film.

13. lens as claimed in claim 1, it is characterised in that described fully reflecting surface (21) is provided with Several ripples, intersect to form spike between adjacent two ripples.

14. lens as claimed in claim 1, it is characterised in that described incidence surface (11) is sphere Shape.

15. lens as claimed in claim 1, it is characterised in that described second exiting surface (22) Circular in cross-section or ellipse.

16. lens as claimed in claim 1, it is characterised in that described second exiting surface (22) Longitudinal section rectangular and trapezoidal shapes.

17. lens as claimed in claim 1, it is characterised in that described second exiting surface (22) phase Centrage for described second lens body (2) inwardly concaves or outwardly.

18. lens as claimed in claim 1, it is characterised in that described second exiting surface (22) Top half and/or the latter half have a plurality of annular corrugated.

19. 1 kinds of light-emitting devices, including lens and light source, it is characterised in that described lens are such as right Requiring the lens according to any one of 1-18, described light source is LED luminescence chip area source.