CN201273524Y

CN201273524Y - Convex Fresnel light-emitting diode optical lens and light-emitting diode assembly formed by same

Info

Publication number: CN201273524Y
Application number: CNU2008201331586U
Authority: CN
Inventors: 徐三伟; 陈翊民
Original assignee: E Pin Optical Industry Co Ltd
Current assignee: E Pin Optical Industry Co Ltd
Priority date: 2008-09-19
Filing date: 2008-09-19
Publication date: 2009-07-15
Anticipated expiration: 2018-09-19

Abstract

The utility model relates to a Convex surface Fresnel light emitting diode optical Lens and light emitting diode subassembly (constant-Fresnel LED Lens for the adjustable Distribution pattern and the LED optical theory) that constitutes Thereof, optical Lens is the Fresnel optical Lens that an image side optical surface (optical surface on the forward side) is the Fresnel optical surface of Convex surface and have perpendicular ring tooth (draft with vertical shape), makes optical Lens in the light emitting diode subassembly (LED) that constitutes, can gather and produce the light intensity (peak intensity) that the LED wafer sent and be the ellipse and shine the angle of illumination type (ellipse and angle of illumination type Distribution pattern), again optical Lens and light emitting diode subassembly satisfy specific condition; therefore, the utility model discloses only use an solitary optical lens piece can gather into predetermined special light type with the light that the LED wafer sent, and accord with the requirement that luminous flux ratio value is greater than 85%, can supply illumination, cell-phone flash light or camera flash light to use.

Description

Convex Fresnel light-emitting diode optical lens and light-emitting diode assembly formed by same

Technical Field

The utility model relates to a light emitting diode optical lens piece and light emitting diode subassembly that constitutes thereof especially relates to one kind and can produce the fei nieer optical lens piece that luminous intensity (peak intensity) is oval illumination angle light type (Elliptical distribution pattern), and the supply is used for by the light emitting diode subassembly of LED light emitting source in order to produce the light type, and can be applied to the flash light of LED illumination, cell-phone or camera.

Background

Light Emitting Diodes (LEDs) have the advantages of low voltage, low power consumption and long service life, and are widely used in the fields of display devices (indicators), lighting devices (illuminators), and the like. Because LEDs have the characteristics of simple light color, miniaturization, and planar packaging, LEDs have been used in flash lamps of mobile phone cameras. However, since the light emitted from the LED chip has a point source and non-uniform brightness, researchers have conducted many researches on the collection of light, such as chip size reduction and light emitting efficiency improvement, and the use of optical lenses is also an important technical development direction.

The design of the LED optical lens can be divided into primary optical lenses (primary optical lenses) and secondary optical lenses (secondary optical lenses); the primary optical lens is a lens directly packaged on the LED chip, and generally focuses on concentrated (concentrated) light; the secondary optics is used in a single or multiple LED arrays (Array) and mainly disperses the light beam. In the existing primary optical lens design, for example, ES2157829 is a symmetric aspherical lens; japanese patents JP3032069, JP2002-111068, JP2005-203499, US2006/187653, Chinese patent CN101013193 and the like use spherical lenses; JP2002-221658 uses a spherical lens or the like for a Bulk type LED. For high-order applications, the primary optical lens can generate a specific light pattern (distribution pattern) at a uniform light intensity (peak intensity), such as a special light pattern with a large angle, a small angle, a circle, an ellipse, etc., to be used in combination with the LED array to generate an optimal optical effect. As shown in fig. 1A and 1B, a lens 23 is covered on an LED chip 21, and when light emitted from the LED chip 21 is collected by the lens 23, a predetermined light pattern is emitted, or a layer of secondary optical lens is added on the primary optical lens to obtain a uniform effect. The primary optics have various designs, wherein the primary optics use Fresnel (Fresnel) type optical surfaces, as described in the prior art, e.g. in german patent WO/2003/083943; japanese patent JP2005-049367 and the like; U.S. patent No. US6,726,859, publication nos. US2007/0275344, US 2008/0158854; european patent EP 1091167; and Taiwan patent TW200711186, and the like; however, the above-mentioned prior art mainly uses fresnel lenses to cover several LEDs or secondary optical lenses (secondary lenses) for projection devices (projectors). However, as the luminous efficiency of the LED rapidly develops, the use of a single LED is increasingly important. The light source composed of LED array or multiple LEDs can transmit the crossed light rays to be compensated by the lens to become uniform light rays; however, a single LED is far more complex than a light source composed of an LED array or a plurality of LEDs in the design of a primary lens, and the light condensing efficiency and the light intensity homogenization of the primary optical lens (primary lens) must be considered; such as JP2005-257953, US 2006/0027828, which use a single or double-sided fresnel lens placed over the LED illuminator to produce uniform light, as shown in fig. 1A, 1B; for example, taiwan patent TW560085 uses a parabolic bowl-shaped side surface and a fresnel lens to reduce beam divergence and form a uniform beam pattern; also, for example, korean patent 1020070096368 and taiwan patent I261654 make fresnel lenses into primary LED optical lenses, but the light pattern is mainly circular, and it is still difficult to expand the application of single LED module with an elliptical light pattern for practical use.

With the progress of science and technology, electronic products are continuously developed toward light, thin, short, small and multifunctional directions, and the electronic products include: in addition to lenses, Digital Still cameras (Digital Still cameras), computer cameras (PC cameras), Network cameras (Network cameras), mobile phones (cell phones), and other devices have been required to add lenses to Personal Digital Assistants (PDAs); therefore, the LED flash lamps or the LED lamps for lighting used in these products often have an array of single or multiple LED assemblies; in order to be convenient to carry and meet the requirement of humanization, the LED flash lamp or the LED lamp for illumination not only needs the light flux which meets the requirement, but also needs smaller volume and lower cost due to the mutual collocation of different light type LED components. The Fresnel lens is provided with a group of irregular Fresnel rings (Fresnel zone plates) on the surface of the lens, the ring pitch (zone pitch) of the Fresnel lens is gradually increased from inside to outside or from outside to inside (the ring pitch) is changed), and the Fresnel lens has the characteristics of light weight, thinness, plasticity and low cost besides the capability of guiding and collecting light rays, so the Fresnel lens is very suitable for being used in a lighting system; however, for the use of multi-point LED lighting, the uniformity of illumination and light intensity is considered. In the prior art, a certain proportion of a ring pitch and a ring depth (a ring height) or a gradual change of the ring pitch and the ring depth is usually adopted, and particularly, a lighting system formed by a plurality of LEDs can better meet the practical requirement of uniform illumination and light intensity by a gradual change of the ring pitch; however, for a single LED primary optical lens, the optical characteristics of the optical lens are matched with each other. Although the fresnel lens has a complicated outer surface and a high manufacturing cost, it has a good light efficiency and uniformity effect, and is particularly noticed for illumination of a single LED module. For making the light that single LED sent reach the highest efficiency, the utility model discloses under this urgent need promptly, utilize fresnel lens to make once optical lens in order to produce specific oval type and with the LED subassembly that forms the utility model discloses a under the appropriate constitution, can gather and produce even luminous intensity (peak intensity) and oval-shaped light type to the light that surface emitting's LED wafer sent.

Disclosure of Invention

The present invention provides a convex fresnel LED optical lens and an LED assembly comprising the same, wherein the LED assembly comprises an LED chip (LED die) for emitting light, a fresnel optical lens for gathering light and forming an elliptical light pattern with uniform light intensity, and a sealant layer (seal layer) for filling between the fresnel optical lens and the LED chip, wherein the fresnel optical lens can be a crescent (meniscus) lens, the outer edge surface of which can have taper or no taper, the concave surface of which is a light source side optical surface facing a light source and can be spherical or aspherical, the convex surface of which is an optical surface (optical surface on front side) facing an image side and has a fresnel optical surface, the light gathering curved surface of which can be aspherical or spherical, the ring surface of which is a vertical ring gear (vertical ring gear) and can have an equal ring depth (equal ring gear) or an equal ring pitch (equal ring pitch), and can satisfy the following conditions:

wherein:

wherein f is_SIs the length of the effective focal length (effective focal length) of the optical lens, r_nIs the last ring (Lastzone) radius of the Fresnel optical surface R2₂Z optical lens thickness, N, as central axis_d2Is the refractive index of the optical lens, 2 phi_xIs half (I) of the maximum intensity (intensity) of light in the X direction emitted through the optical lens_1/2) Angle of (deg.), 2 phi_yIs half of the maximum light intensity (I) in the Y direction of the light emitted through the optical lens_1/2) Angle (deg.) of (d), 2Lx is the length of the LED chip in the X direction, 2Ly is the length of the LED chip in the Y direction, f_gIs the length of the equivalent focal length (relative focal length) of the optical lens, R₁Radius of curvature of light source side optical surface, R_FThe radius of curvature (radius of curvature) of the converging curved surface of the image-side fresnel optical surface, D0 is the LED wafer thickness, D1 is the thickness of the encapsulant layer around the central axis, and D is the radius of the optical lens on the image-side optical surface.

Furthermore, in order to meet different light type angles and light condensation characteristics, the curvature radius R of the light condensation curved surface of the Fresnel optical surface_FAnd may be spherical or aspherical.

For simplicity of manufacturing, the fresnel optical lens may be replaced by a lens made of plano-convex (plano-convex) optical material, and the image side optical surface of the fresnel optical lens is a fresnel optical surface and satisfies the conditions of equations (1) to (3).

In order to increase the efficiency of the LED assembly, the outer edge surface of the fresnel optical lens may have a taper v, and the image-side optical surface thereof is a fresnel-type optical surface, and may satisfy the conditions of formulas (1) to (3).

Another objective of the present invention is to provide an optical lens made of optical glass or optical plastic for convenient selection.

Another object of the present invention is to provide a light emitting diode assembly, which comprises the flat convex or crescent fresnel light emitting diode optical lens and a light emitting diode wafer, wherein the light emitting diode assembly has an elliptical light shape, and the luminous flux ratio η thereof is greater than 85% (η ═ β/α is greater than 85%), and satisfies the following conditions:

E_1/2≤0.7E_d (7)

wherein,

wherein r is_nIs the last ring (Lastzone) radius of the Fresnel optical surface R2, 2-_xIs half (I) of the maximum intensity (intensity) of light in the X direction emitted through the optical lens_1/2) Angle of (deg.) 2 phi_yIs half of the maximum light intensity (I) in the Y direction of the light emitted through the optical lens_1/2) Angle of (deg.) r_nIs the radius of the last ring (Lastzone) of the Fresnel optical surface R2, and alpha is the LED crystalThe sheet emits a luminous flux of light, beta being the image side at a relatively infinite distance (100 times f)_S) The luminous flux of the light irrespective of attenuation factors, wherein eta is a luminous flux ratio eta of beta/alpha, E_dIlluminance (Incidance) emitted for LED chip, E_1/2The illuminance at half the maximum light intensity emitted by the fresnel optics.

Compared with the prior art, the utility model discloses a convex surface fresnel light emitting diode optical lens and the emitting diode subassembly that constitutes thereof can have oval light type, and accords with the requirement that luminous flux ratio value is greater than 85%, and optical lens has the characteristic that thickness is thin, can be used to single LED or array LED, provides the flash light that gives illumination or cell-phone, camera and uses.

Drawings

FIGS. 1A and 1B are schematic diagrams of a prior art LED assembly using LED optics;

fig. 2 is a schematic perspective view of the present invention using a non-tapered fresnel LED optical lens for an LED assembly;

fig. 3 is a schematic perspective view of the present invention using a tapered fresnel LED optical lens for an LED assembly;

FIG. 4 is a graph showing the relationship between the Fresnel LED optical lens with equal annular spacing between the vertical ring teeth and the curvature radius of the condensing curved surface;

FIG. 5 is a graph showing the relationship between the Fresnel LED optical lens with equal ring depth of the vertical ring teeth and the curvature radius of the condensing curved surface;

fig. 6 is a schematic diagram illustrating the structure of the LED optical lens of the present invention in the LED assembly;

FIG. 7 is a representation of the taper of a tapered Fresnel LED optical lens;

fig. 8 is a schematic view of the fresnel LED optical lens of the present invention on the light path of the LED module;

fig. 9 is a schematic view of refraction of the group a light rays and the group B light rays of the fresnel LED optical lens of the present invention;

fig. 10 is a schematic diagram of the light paths of the group a and the group B of the fresnel LED optical lens of the present invention;

FIG. 11 is a schematic diagram of the combination of group A light and group B light of FIGS. 9 and 10 into uniform light intensity;

fig. 12 is a polar diagram of the light intensity distribution versus illumination angle of the LED assembly according to the first embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 13 is a polar diagram of the light intensity distribution versus illumination angle of an LED assembly according to a second embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 14 is a polar diagram of the light intensity distribution versus illumination angle of an LED assembly according to a third embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 15 is a polar diagram of the light intensity distribution versus illumination angle of an LED assembly according to a fourth embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 16 is a polar diagram of the light intensity distribution versus illumination angle of an LED assembly according to a fifth embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 17 is a polar diagram of the light intensity distribution versus illumination angle of an LED assembly according to a sixth embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction);

fig. 18 is a polar coordinate diagram of the light intensity distribution and illumination angle of an LED assembly according to a seventh embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction); and

fig. 19 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module according to the eighth embodiment of the present invention (where "C" represents the X direction and "D" represents the Y direction).

Description of reference numerals: 10-an LED assembly; 11. 21-an LED wafer; 12. 22-a sealant layer; 13. 23-an optical lens; r1-light source side optical surface (optical surface) or its radius of curvature (radiausprotorvaxis); r2-image side optical surface (optical surface forward) or its radius of curvature (radia using optical axis); r_F-radius of curvature of the converging curved surface (radius of fresnel lens) of the image side fresnel optical surface; d 0-LED wafer thickness on center axis (LEDdiethhicknessONopticalaxis); d 1-optical surface distance from the surface of the LED chip on the central axis to the light source side of the optical lens; (throknessfromdiescufacetor 1 oneoptical axis); d 2-central axis optic thickness (lentickhicknesson optical axias); r 1-first ring radius (firstzoneradius); r is_n-last ring radius (lastzoneradia); r is_t-a ring pitch (zonepatch); h is_d-ring depth (zonehight); n is a radical of_d-refractive index (Refractiveindex); v. of_d-abbe number (Abbenumber); e_d-the illuminance emitted by the LED chip (origin); e_1/2-illuminance at half maximum light intensity emitted by the fresnel optics (origin); luminous Flux (Flux) of light emitted from the α -LED chip; beta-the luminous Flux (Flux) of a ray at relatively infinity on the image side.

Detailed Description

To make the present invention more clear and more detailed, the following drawings are provided to illustrate the preferred embodiments and to explain the structural and technical features of the present invention as follows:

referring to fig. 6, it is a schematic structural diagram of the convex fresnel led optical lens and the led assembly 10 formed by the same according to the present invention, which is arranged along the central axis Z from the light source side (source) to the image side (forward) in sequence: an LED chip 11, an adhesive layer 12 and an optical lens 13, wherein when light is emitted from the LED chip 11, the light passes through the adhesive layer 12 and then passes through the optical lensThe sheet 13 collects the light and forms an elliptical light pattern symmetrical to the central axis Z to irradiate the image side with a light beam; the optical lens 13 is a lens made of an optical material, the concave surface of the lens is a light source side optical surface R1 facing the light source, the optical surface R1 can be an aspheric surface or a spherical surface, and the fresnel optical surface R2 facing the image side is a fresnel optical surface with vertical ring teeth (vertical ring teeth); optical surface R2 of optical lens 13 and optical lens thickness d₂And the angle of the beam pattern formed by the light intensity formed by the optical lens 13, which satisfies the conditions of the equations (1) and (2) between the effective focal lengths

(X direction 2. phi.)_x2 phi from Y direction_y) The condition of formula (3) is satisfied.

The material of the sealing adhesive layer 12 is not limited to be used, and different materials such as optical resin (resin) or silica gel (sili gel) are commonly used on the LED assembly; and the optical lens 13 may be made of optical glass or optical plastic material.

As shown in fig. 2, a plano-convex (plano-concave) fresnel LED optic is used for an LED device, which is arranged along a central axis Z from a light source to an image side in order: an LED chip 11, a sealant layer 12 and a bi-planar fresnel optical lens 13, wherein the optical surface R1 of the optical lens 13 on the light source side is a plane (R1 ∞), and the other optical surface (opposite surface) is a fresnel optical surface R2 that is convex toward the image side and has vertical ring teeth. An optical surface R2 and an optical lens thickness d of the optical lens 13₂And the angle of the beam pattern formed by the light intensity formed by the optical lens 13, which satisfies the conditions of the equations (1) and (2) between the effective focal lengths

Referring to FIG. 3, another embodiment of the present invention is a schematic diagram of an LED device 20 using a Fresnel lens arranged along a central axis Z to emit lightThe source to the image side are in order: an LED chip 21, an adhesive layer 22 and a flat-convex fresnel optical lens 23, wherein the fresnel optical lens 23 is an optical lens with a taper v as shown in fig. 7, that is, the outer edge surface of the fresnel optical lens 23 has a taper v. After the light is emitted from the LED chip 21 and passes through the sealant layer 22, the light is collected by the optical lens 23 and forms a light beam which is symmetrical to the central axis Z and has an elliptical illumination angle to irradiate the image side; by the fresnel optical lens 23 having the taper v, light dissipated from the side surface of the optical lens 23 can be reduced, and efficiency can be improved. The optical surface R2 and the optical lens thickness d of the optical lens 23₂And the angle of the beam pattern formed by the light intensity formed by the optical lens 23, which satisfies the conditions of the equations (1) and (2) between the effective focal lengths

The image side optical surface R2 of the optical lens 13 or the optical lens 23 is a fresnel optical surface. The image-side optical surface R2 of the present invention is a fresnel optical surface with vertical ring teeth (R2) as shown in fig. 4 and 5, wherein the image-side fresnel optical surface is a light-gathering curved surface (R2)_F) The transfer is performed, and the fresnel optical surfaces with an equal annular pitch (equal annular pitch) or the fresnel optical surfaces with an equal annular depth (equal annular depth) are respectively formed in different transfer manners as shown in fig. 4; referring to fig. 4, the image side optical surface R2 is an equiangular (equiannular) fresnel optical surface, that is, a ring pitch R_tIs a fixed value, and is the curvature radius R of the light-condensing curved surface_FLight-condensing curved surface (R)_F) At equal ring spacing (zonepatch) r_tBut with unequal drop (the central axis Z point being the highest point), i.e. unequal ring depth (zonehight) h_dWill condense light to a curved surface (R)_F) The annular Fresnel optical surface (image-side optical surface R2) is transferred into equally spaced rings, i.e. each ring (zone) is formed by a sloping surface (slope) and a vertical ring surface (vertical ring surface), the first ring radius of which is R₁The last ring has a radius r_n. When light is incident on the fresnel optical surface (R2), the incident light is refracted by the inclined surface of each ring, and the light effect similar to a paraboloid (or a light-condensing curved surface) is achieved as shown in fig. 9. Referring again to fig. 5, the image side optical surface R2 is an equal ring depth (equal ring depth) fresnel optical surface, that is, the ring depth h_dIs a fixed value, and is the curvature radius R of the light-condensing curved surface_FLight-condensing curved surface (R)_F) Equal drop height (the central axis Z point is the highest point), namely equal ring depth (zonehight) h_dBut unequal ring spacing (zonepatch) r_tWill condense the light to a curved surface R_FAn annular Fresnel optical surface (image side optical surface R2) shifted to an equal annular depth (equal annular height) and having a first annular ring (radius R)₁. Similarly, when light is incident on the fresnel optical surface, the incident light is refracted by the inclined surfaces between the rings, and the light effect similar to the parabolic curved surface (or the light-gathering curved surface) is achieved as shown in fig. 9.

Referring to fig. 9, 10 and 11, after the light rays (a1, a2 and A3) of the group a are refracted by the fresnel optical surface, the exit angles of the light rays are different due to the difference of the incident angles of the light rays a1, a2 and A3The position of the angle on the target object is different as shown in figure 10; for the radial position of the central axis after the emergent, the group A light rays present a light group with stronger light intensity at the center; similarly, the light rays of group B (B1, B2, and B3) are refracted by the fresnel optical surface, and then the light group with strong light intensity at the center is also shown; after the group A light and the group B light are combined, as shown in fig. 11, a light type with uniform light intensity is generated, so that the phenomena that the intensity of a central area is too strong, the light of a marginal area is weak, and even a circle of dark and bright light is generated are avoided or reduced.

When the optical Surface R1 of the optical lens 13 or the optical Surface R1 of the optical lens 23 is constituted by an Aspherical optical Surface, the Aspherical Surface equation (Aspherical Surface Formula) is the Formula (9)

Z = \frac{{ch}^{2}}{1 + \sqrt{(1 - (1 + K) c^{2} h^{2})}} + A_{4} h^{4} + A_{6} h^{6} + A_{8} h^{8} + A_{10} h^{10} - - - (9)

Wherein c is curvature, h is lens height, K is cone coefficient (Conicconstant), A₄、A₆、A₈、A₁₀Aspheric coefficients of order four, six, eight, ten (nth order of aspheretical coefficient), respectively.

Radius of curvature R of light-gathering curved surface of Fresnel optical surface_FAlso defined by formula (9), the radius of curvature R of the light-converging curved surface for a paraboloid_FThe conic coefficient K is-1, and the curvature radius R of the spherical light-gathering curved surface_FThe conic coefficient K of (a) is 0.

Please refer to fig. 8, which is a schematic diagram of the light path of the LED optical lens of the present invention in the LED assemblyIn the LED chip 11(21), the light emitted from the LED chip is collected and refracted by the optical lens 13(23) to form 2Angle (X direction 2 phi)_x2 phi from Y direction_y) The required elliptic light type and the requirement that beta/alpha is more than or equal to 85 percent are formed, wherein alpha is the luminous flux of the light emitted by the LED wafer, beta is the luminous flux of the light with the image side being relatively infinite (100 times fs), the effects of refraction (diffraction) and scattering (scattering) of air and the like are ignored, and the requirement meets the condition of the formula (7). By the structure, the utility model discloses utilize a plano-convex or crescent type fresnel light emitting diode optical lens and a LED wafer, can make LED subassembly 10 can send the oval light type of predetermined even luminous intensity, can use or constitute the array with different light types and use for single.

The best embodiment disclosed below is to explain the practical main components of the present invention, and in order to explain and compare the application of each embodiment, the wafer using 1.85 × 0.77mm size as the LED wafer 11 is adopted, the wafer having the blue light with the wavelength of the highest intensity (1 peak-wave-length) of 450nm and the second highest intensity (2 peak-wave-length) of 550nm is adopted, and the emission angle ω in the X direction is_x39.8 DEG, emission angle omega in Y direction_y35.2 ° and α 78.5 lumen (1m), illuminance E_d23.97 Lux (Lux); the optical lens 13 (or the optical lens 24) has a diameter of 5mm (D ═ 2.5mm) for illustration; the Fresnel optical surface is selected from the Fresnel optical surfaces with equal annular space or equal annular depth and vertical annular teeth; the sealant layer 12 utilizes the refractive index N_d1Packed with 1.491 clear optical silica gel. However, in addition to the optical lens and the LED assembly thereof disclosed in the present invention, other structures are also commonly known, that is, the size of the optical lens and the LED assembly, the material used, the LED wavelength and emission angle, the fresnel optical surface type, the ring pitch and the ring depth, etc. may be changed, modified, or even equivalently changed.

The following first to fourth embodiments are light emitting diode modules configured by using a plano-convex fresnel optical lens having no taper and equal ring depth, the fifth embodiment is a light emitting diode module configured by using a plano-convex fresnel optical lens having taper and equal ring depth, the sixth embodiment is a light emitting diode module configured by using a plano-convex fresnel optical lens having no taper and equal ring pitch, and the seventh to eighth embodiments are light emitting diode modules configured by using a crescent fresnel optical lens having no taper and equal ring depth.

< first embodiment >

Please refer to fig. 6 and 12, which are schematic diagrams of a light emitting diode assembly formed by using a convex fresnel optical lens and polar coordinate diagrams of the light intensity distribution and the illumination angle of the first embodiment, respectively.

The following list (I) includes an LED chip 11 along a central axis Z from a light source side to an image side, an adhesive layer 12, a curvature radius R (unit: mm) of a light source side optical surface R1 and an image side optical surface R2 of an optical lens 13, or a curvature radius R of a Fresnel central axis condensing curve_FIn mm, the distance di in mm, the taper u of the optical lens 13, and the refractive indices N_d) And the like. In this embodiment, a convex fresnel optical lens with a zero taper and a constant annular depth is used, and the optical surface R1 in fig. 6 is a plane.

Watch 1

^*Aspherical Zone Fesnel

In table (a), the optical surfaces (surf.no.) have fresnel optical surfaces that are aspheric. The following table (two) is the Fresnel optical surface radius R_PThe first phenanthrene from the center of each coefficient of equation (9) of the aspherical surfaceRadius r of the Neel ring₁Last fresnel ring radius r_nFresnel ring depth (zonehight) h_dAnd fresnel ring number (No. offzone):

watch 2

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 67.424 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 82 ° in the X direction and 65 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.8589

I_1/2＝20.5

φ_x＝41.0

φ_y＝32.5

\frac{f_{s}}{r_{n}} = 2.1640

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.2130

\frac{E_{1 / 2}}{E_{d}} = 0.1039

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 12 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (one), table (two) and fig. 12 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

< second embodiment >

Please refer to fig. 6 and fig. 13, which are schematic diagrams of a light emitting diode assembly formed by using a convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

The following table (III) includes an LED wafer 11 along a central axis Z from a light source side to an image side, an adhesive layer 12, a curvature radius R of a light source side optical surface R1 and an image side optical surface R2 of an optical lens 13, or a curvature radius R of a Fresnel central axis condensing curved surface_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a convex fresnel optical lens with a zero taper and a constant annular depth is used, and the optical surface R1 in fig. 6 is a plane.

Watch (III)

^*Aspherical Zone Fesnel

In table (three), the optical surfaces (surf.no.) have fresnel optical surfaces that are aspheric. The following (four) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (IV)

In this exampleThe optical lens 13 is made of the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 70.245 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 67 ° in the X direction and 40 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9219

I_1/2＝29.5

φ_x＝33.0

φ_y＝19.1

\frac{f_{s}}{r_{n}} = 1.0081

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.4601

\frac{E_{1 / 2}}{E_{d}} = 0.3216

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 13 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED assembly of this embodiment. By above-mentioned table (three), table (four) and fig. 13 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity of its each angle is all the same, can promote the utility model discloses an application.

< third embodiment >

Please refer to fig. 6 and 14, which are schematic diagrams of a light emitting diode assembly formed by using a convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

The following table (V) includes an LED wafer 11 along a central axis Z from a light source side to an image side, a sealant layer 12, a curvature radius R of a light source side optical surface R1 and an image side optical surface R2 of an optical lens 13, or a curvature radius R of a Fresnel central axis condensing curved surface_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a convex fresnel optical lens with a zero taper and a constant annular depth is used, and the optical surface R1 in fig. 6 is a plane.

Watch (five)

^*Aspherical Zone Fesnel

In table (v), the optical surfaces (surf.no.) have fresnel optical surfaces that are aspheric. The following (six) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (six)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 73.798 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 70 ° in the X direction and 42 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9401

I_1/2＝30.5

φ_x＝35.2

φ_y＝19.5

\frac{f_{s}}{r_{n}} = 1.0081

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.4601

\frac{E_{1 / 2}}{E_{d}} = 0.3140

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 14 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (five), table (six) and fig. 14 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

< fourth embodiment >

Please refer to fig. 6 and fig. 15, which are schematic diagrams of the led assembly formed by the convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

The following (seventh) list includes the LED wafer 11 along the central axis Z from the light source side to the image side, the sealant layer 12, the curvature radius R of the light source side optical surface R1 and the image side optical surface R2 of the optical lens 13, or the curvature radius R of the Fresnel central axis condensing curve_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a non-tapered and equal ring depth convex Fresnel plastic PMMA is usedThe optical surface of the optical lens manufactured is a plane surface at R1 in fig. 6.

Watch (seven)

^*Aspherical Zone Fesnel

In table (vii), the optical surfaces (surf.no.) have fresnel optical surfaces that are aspheric. The following (eight) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (eight)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.491 and Abbe number v_d2Is made of 32 PMMA plastic material. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 74.069 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 62 ° in the X direction and 40 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9435

I_1/2＝24.5

φ_x＝31.0

φ_y＝20.0

\frac{f_{s}}{r_{n}} = 1.0081

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.3881

\frac{E_{1 / 2}}{E_{d}} = 0.2766

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 15 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (seven), table (eight) and fig. 15 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

< fifth embodiment >

Please refer to fig. 6 and fig. 16, which are schematic diagrams of a light emitting diode assembly formed by using a convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

In the following Table (nine), the LED wafer 11, the sealant layer 12, the curvature radius R of the light source side optical surface R1 and the curvature radius R of the image side optical surface R2 of the optical lens 13, or the curvature radius R of the Fresnel central axis converging curved surface are arranged along the central axis Z from the light source side to the image side_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a convex Fresnel optical lens with a zero taper and an equal ring depth is used, and the curvature radius R of the Fresnel optical lens is_FIs spherical, and the optical surface R1 in fig. 6 is a plane.

Watch (nine)

^*Aspherical Zone Fesnel

In table (nine), the optical surfaces (surf.no.) have fresnel optical surfaces that are aspheric. The following Table (ten) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (Ten)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 72.48 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 68 ° in the X direction and 43 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9219

I_1/2＝32.5

φ_x＝33.0

φ_y＝19.0

\frac{f_{s}}{r_{n}} = 1.0742

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.4601

\frac{E_{1 / 2}}{E_{d}} = 0.4043

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 16 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (nine), table (ten) and fig. 16 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

< sixth embodiment >

Please refer to fig. 6 and 17, which are schematic diagrams of a light emitting diode assembly formed by using a convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

In the following list (eleven), the LED chip 11, the sealant layer 12, the curvature radius R of the light source side optical surface R1 and the curvature radius R of the image side optical surface R2 of the optical lens 13, or the curvature radius R of the fresnel central axis converging curved surface are arranged from the light source side to the image side along the central axis Z, respectively_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, the Fresnel optical lens is made of a convex glass material having no taper and equal annular spacing, and the curvature radius R of the Fresnel optical lens is_FIs spherical, and the optical surface R1 in fig. 6 is a plane.

Watch (eleven)

^*Spherical Zone Fesnel

In table (eleven), the optical surfaces (surf.no.) have fresnel optical surfaces denoted by spherical surfaces. The following Table (twelve) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel ring spacing r_tAnd the number of Fresnel rings:

watch (twelve)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 72.72 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 85 ° in the X direction and 70 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.8913

I_1/2＝22.5

φ_x＝42.0

φ_y＝35.0

\frac{f_{s}}{r_{n}} = 2.0243

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.2300

\frac{E_{1 / 2}}{E_{d}} = 0.002

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 17 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (eleven), table (twelve) and fig. 17 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

< seventh embodiment >

Please refer to fig. 6 and fig. 18, which are schematic diagrams of the led assembly formed by the convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

In the following table (thirteen), the LED wafer 11, the sealant layer 12, the curvature radius R of the light source side optical surface R1 and the curvature radius R of the image side optical surface R2 of the optical lens 13, or the curvature radius R of the Fresnel central axis converging curved surface are arranged along the central axis Z from the light source side to the image side_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a convex Fresnel optical lens with a zero taper and an equal ring depth is used, and the curvature radius R of the Fresnel optical lens is_FIs spherical, and the optical surface R1 in fig. 6 is a plane.

Watch (thirteen)

^*Aspherical Zone Fesnel

In table (thirteen), the optical surfaces (surf.no.) have fresnel optical surfaces labeled as aspherical surfaces. The following Table (fourteen) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (fourteen)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being collected by the optical lens 13, β at infinity (100 fs times) is 72.929 lumens (ignoring the effects of refraction and scattering of air) at an elliptical illumination angle of 68 ° in the X direction and 36 ° in the Y direction; formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9163

I_1/2＝29.0

φ_x＝33.9

φ_y＝18.1

\frac{f_{s}}{r_{n}} = 1.0081

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.4361

\frac{E_{1 / 2}}{E_{d}} = 0.3232

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 18 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. As shown in the above-mentioned table (thirteen), table (fourteen) and fig. 18, it can be verified that the led module schematic diagram formed by the convex fresnel optical lens of the present invention has high efficiency and predetermined elliptical light pattern, and the light intensity at each angle is the same, so as to improve the applicability of the present invention.

< eighth embodiment >

Please refer to fig. 6 and fig. 19, which are schematic diagrams of the led assembly formed by the convex fresnel optical lens according to the present invention and polar coordinate diagrams of the light intensity distribution and the illumination angle according to the present embodiment, respectively.

The following table (fifteen) includes an LED wafer 11 along a central axis Z from a light source side to an image side, a sealant layer 12, a curvature radius R of a light source side optical surface R1 and an image side optical surface R2 of an optical lens 13, or a curvature radius R of a Fresnel central axis condensing curved surface_FThe distance di, the taper upsilon of the optical lens 13, and the refractive indexes (N)_d) And the like. In this embodiment, a convex fresnel optical lens with taper and equal ring depth is used, and the optical surface R1 in fig. 6 is a plane.

Watch (fifteen)

^*Aspherical Zone Fesnel

In table (fifteen), the optical surfaces (surf.no.) have fresnel optical surfaces labeled as aspherical surfaces. The following Table (sixteen) is the Fresnel optical surface radius R_PThe first Fresnel ring radius r from the center of each coefficient of the aspherical surface of equation (9)₁Last fresnel ring radius r_nFresnel Ring depth h_dAnd the number of Fresnel rings:

watch (sixteen)

In this embodiment, the optical lens 13 utilizes the refractive index N_d2Is 1.582 and Abbe number v_d2Is made of 61.7 glass materials. The refractive angle of light is formed by matching the refractive index and Abbe number of the sealant layer 12 and the optical lens 13. After being focused by the optical lens 13, the light beam is irradiated at an elliptical angle of 65 degrees in the X direction and 60 degrees in the Y direction at infinity (in terms of fs of 100 times)) 71.41 lumens (neglecting refraction and scattering effects of air); formulas (1), (2), (3), (7) and (8) are respectively:

η＝0.9096

I_1/2＝30.1

φ_x＝32.1

φ_y＝18.1

\frac{f_{s}}{r_{n}} = 1.0081

(N_{d 2} - 1) \frac{d_{2}}{f_{s}} = 0.3786

\frac{E_{1 / 2}}{E_{d}} = 0.3484

conditional expressions (1), (2), (3) and (7) can be satisfied. Fig. 19 is a polar coordinate diagram of the light intensity distribution and the illumination angle of the LED module of the present embodiment. By above-mentioned table (fifteen), table (sixteen) and fig. 19 show, can prove from this that the utility model discloses a light emitting diode subassembly sketch map that convex surface fresnel optical lens constitutes has high efficiency and has predetermined oval light type, and the luminous intensity homogeneous of its each angle can promote the utility model discloses an application.

The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the present invention. Those skilled in the art will recognize that many changes, modifications, and equivalents may be made thereto without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A convex Fresnel light-emitting diode optical lens is used in a light-emitting diode assembly, and the light-emitting diode assembly sequentially comprises a light-emitting diode wafer, a sealing glue layer and an optical lens from a light source side to an image side along a central axis; the method is characterized in that:

the optical lens is provided with an image side optical surface and a light source side optical surface, wherein the image side optical surface is a convex Fresnel optical surface, a ring surface of the Fresnel optical surface is formed by transferring a light-gathering curved surface, the ring surface is provided with vertical ring teeth, so that light rays emitted by the light-emitting diode wafer form an elliptical illumination-angle illumination type after passing through the sealing adhesive layer and the optical lens, and the optical lens meets the following conditions:

wherein f is_sIs the effective focal length r of the optical lens_nIs the last ring radius, d, of the Fresnel optical surface₂Thickness of the optical lens, N, as the center axis_d2Is the refractive index of the optical lens.

2. The convex fresnel led optical lens according to claim 1, wherein the optical lens further satisfies the following condition:

wherein:

wherein f is_sIs the effective focal length of the optical lens, r_nIs the last ring radius of the Fresnel optical surface, d₂Thickness of the optical lens about the central axis, N_d2Is the refractive index of the optical lens, 2 phi_xIs the angle of half of the maximum light intensity of the light emitted through the optical lens in the X direction, 2 [ + ]_yThe angle of the light emitted from the optical lens at half of the maximum light intensity in the Y direction is 2Lx, 2Ly, fg, and R, wherein 2Lx is the length of the LED chip in the X direction, 2Ly is the length of the LED chip in the Y direction, fg is the equivalent focal length of the optical lens, and R is the equivalent focal length of the optical lens₁Radius of curvature of light source side optical surface, R_FThe curvature radius of the converging curved surface of the image-side Fresnel optical surface, d₀Is the thickness of the LED wafer, d₁The thickness of the sealant layer is taken as the central axis, and D is the radius of the optical surface of the optical lens at the image side.

3. The convex fresnel led optical lens according to claim 1, wherein the light source side optical surface of the optical lens is a flat surface.

4. The convex fresnel led optical lens according to claim 1, wherein the light source side optical surface of the optical lens is a concave surface.

5. The convex fresnel led optical lens according to claim 1, wherein the condensing curved surface for transferring to form the fresnel optical surface is a spherical surface.

6. The convex fresnel led optical lens according to claim 1, wherein the condensing curved surface for transferring to form the fresnel optical surface is aspheric.

7. The convex fresnel led optical lens of claim 1 wherein the annular surface of the fresnel optical surface is of equal annular depth.

8. The convex fresnel led optical lens according to claim 1, wherein the annular surface of the fresnel optical surface is equally spaced.

9. The convex fresnel led optical lens of claim 1 wherein the outer edge surface of the optical lens is tapered.

10. The convex fresnel led optical lens according to claim 1, wherein the optical lens is made of one selected from a plastic optical material and a glass optical material.

11. A light emitting diode assembly, characterized by: the Fresnel lens comprises the convex Fresnel LED optical lens as claimed in any one of claims 1 to 10, an adhesive layer and an LED wafer arranged in sequence from a light source side to an image side along a central axis;

the light emitting diode assembly has an elliptical illumination angle type and satisfies the following conditions:

E_1/2≤0.7E_d；

wherein,

wherein r is_nIs the last ring radius of the Fresnel optical surface, 2 phi_xIs half of the maximum light intensity I in the X direction of the light emitted from the optical lens_1/2Angle of (2 phi)_yHalf of the maximum light intensity I in the Y direction of the light emitted through the optical lens_1/2The angle α is the luminous flux of the light emitted from the LED wafer, β is the luminous flux of the light whose image side is not considered to be the attenuation factor at relative infinity, and η is the luminous flux ratio η β/α, E_dThe illumination emitted by the LED chip.

12. The led assembly of claim 11, wherein a ratio of luminous flux of the light emitted from the led assembly to luminous flux at image-side relative infinity satisfies the following condition:

β/α≥85％

wherein α is the luminous flux of the light emitted by the light emitting diode wafer, and β is the luminous flux of the light emitting diode assembly at the image side with respect to infinity, regardless of the effects of refraction and scattering of air, etc.