JP3147939U - Planar Fresnel LED lens and LED assembly thereof - Google Patents

Abstract

Planar Fresnel LED lens and LED assembly constituted thereby.
A planar Fresnel LED lens is disposed with respect to an LED through a seal, an optical surface on forward side is planar, and has a vertical ring shape (draft with vertical shape). The lens is used in the LED assembly, collects light passing through each vertical ring tooth slope of the Fresnel lens with respect to the light emitted by the LED chip 11, and has an irradiation angle where the peak intensity is an ellipse. Forms an optical distribution pattern. With a single lens, the light emitted by the LED chip can be collected into a predetermined special light type, and the light transmission efficiency is 85%, which can be used for lighting, mobile phone flash or digital camera flash.
[Selection] Figure 7

Description

 The present invention relates to an LED lens and an LED assembly formed by the LED lens. In particular, the present invention is applicable to an LED assembly, and can be applied to an LED illumination, a mobile phone, a camera flash, or the like. Related to lenses.

  LEDs have the advantages of low voltage, low power consumption, and long life, and have already been applied in many fields such as display devices and lighting devices. The LED further has the feature that the color of light is simple, downsized, and can be planar packaged, and has already been used on the flash of a mobile phone camera. However, the light emitted from the LED chip is a point light source, and the light intensity is non-uniform, so that it is used in addition to the light collection that has already been extensively studied (eg, chip reduction, light emission efficiency improvement). Lenses are also an important technological development direction.

 In LED lens design, it can be divided into primary lens and secondary optical lens, which is a lens that is packaged directly on the LED chip and usually collects light rays (concentrate ), And the secondary lens is used for one or a plurality of LED arrays. In conventional primary lens design, for example, ES2157829 uses a symmetric aspheric lens, and P3032069, JP2002-111068, JP2005-203499, US2006 / 187653, CN101013193 etc. use a spherical lens. JP2002-221658 uses spherical lenses for bulk LEDs. In high-class operation, the primary lens must be able to generate a specific light pattern (distribution pattern) with more uniform light intensity (peak intensity) in addition to collecting light rays. It is a special light type such as small, circular, elliptical, etc., and uses the LED array in combination to generate the best optical effect.

 As shown in FIGS. 1 and 2, the primary lens is operated by covering the LED chip 21 with a lens 23, collecting light rays emitted from the LED chip 21 via the lens 23, and then applying light rays of a predetermined light type. Or add a further secondary lens on the primary lens to achieve a uniform effect. The primary lens has various different structures, where the primary lens adopts a Fresnel type optical surface, for example, WO / 2003/083943, JP2005-049367, US6,726,859, US2007 / 0275344, US2008. / 0158854, EP1091167, TW200711186, and the like.

However, the above-described conventional technique mainly covers a plurality of LEDs with a Fresnel lens piece or is used as a secondary lens for a projector. However, with the rapid development of LED light emission performance, the operation of a single LED is becoming increasingly important. The light source constituted by the LED array or the plurality of LEDs can compensate for the light beams crossing each other with a lens to be a uniform light beam. However, the single LED is much more complicated in the primary lens design than the light source formed by the LED array or the plurality of LEDs, and it is necessary to consider the light collection efficiency and the uniform light intensity of the primary lens. For example, JP2005-257953, US 2006/0027828 uses a single-sided or double-sided Fresnel lens piece and is disposed above the LED light emitter to generate a uniform light beam as shown in FIGS. In addition, for example, the TW560085 uses a parabolic side surface and a Fresnel lens, reduces beam divergence, and forms a uniform light pattern of the beam. Korean 1020070096368 and TW I261654 form a Fresnel lens as the primary LED, but its light type is mainly a circular irradiation angle and has an elliptical distribution angle light type (Elliptic distribution pattern) that is actually applied. Expansion of operation is difficult for a single LED assembly.
JP 2002-111068 A JP 2005-049367 A

 With the advancement of science and technology, electronic products are constantly developing in the direction of light, thin, small and multi-functional, for example, digital camera (Digital Still Camera), PC camera (PC camera), network camera (Network camera), mobile phone All telephones and PDAs and the like have a head. Thus, the LED flash or illumination LED light source used in this type of product always comprises an array of one or more LED assemblies. In order to be portable and adapt to humanization requirements, LED flash or LED lighting sources for lighting need an appropriate amount of light transmission, such as combining LED assemblies of different light types with each other, etc. At the same time, it must be small volume and low cost. A Fresnel lens is provided with a set of irregular Fresnel zone plates on the lens surface, the zone pitch of which gradually increases from inside to outside or from outside to inside (i.e., ring spacing). In addition to having the ability to guide light and collect light, the Fresnel lens is also suitable for use in lighting equipment because it combines lightness, plasticity, and low cost. However, it is necessary to consider the uniformity of illuminance and light intensity for LED lighting devices that emit light at a plurality of points. The prior art always employs a constant ratio of ring spacing and ring height or gradually changing ring spacing and ring depth, especially in lighting systems composed of multiple LEDs. It can be adopted to meet practical requirements such as uniform illuminance and light intensity. However, a single LED primary lens must be combined with the optical characteristics of the lens. Fresnel lenses have a complex outer mold surface and are expensive to manufacture, but have good light efficiency and uniformity effects, especially when used in the lighting of single LED assemblies. In order to achieve the highest efficiency for the light emitted by a single LED, the present invention uses a Fresnel lens to form the primary lens of the LED and effectively collects and uniformly collects the light emitted by the surface emitting LED chip. It forms a light intensity (peak intensity) and an elliptical light type.

The object of the present invention is to provide a planar Fresnel LED lens and the LED assembly that it comprises, the LED assembly collecting the light beam and collecting the light beam and elliptical with uniform light intensity. It consists of a Fresnel lens forming a light mold and a seal gel layer filled between the Fresnel lens and the LED chip, where the Fresnel lens is a plano-concave lens piece. The outer edge surface has a gradient or no gradient. The concave surface is a light source side optical surface directed to the light source, and is spherical or aspherical, the plane is an optical surface on forward side, and a Fresnel type An optical surface, and the condensing curved surface of the Fresnel optical surface is an aspherical surface or a spherical surface, the ring surface is a draft with vertical shape, and an equal zone depth (equal zone) height) or equal zone pitch, satisfying the following conditions:

Here, f _s is the effective focal length of the lens (effective focal length), r _n is the radius of the outermost end ring of the Fresnel optical surfaces R2 (Last Zone), d ₂ is the central axis Z lens N _d2 is the refractive index of the lens, 2φ _y is the angle (degree, deg.) Of half () of the maximum light intensity (intensity) in the X direction of the refracted ray of the lens , 2φ _y is the angle (degree, deg.) Of half () of the maximum light intensity in the Y direction of the emitted light that has passed through the lens, 2Lx is the length of the LED chip in the X direction, and 2Ly is , The length of the LED chip in the Y direction, fg is the relative focal length of the lens, R ₁ is the radius of curvature of the light source side optical surface, and R _F is the image side Fresnel Radius of fresnel convex surface of the optical surface, d ₀ is the thickness of the LED chip, d ₁ is the thickness of the seal layer of the central axis, D is the lens Image side optics The radius of the face.

Furthermore, the radius of curvature R _{F of the} condensing curved surface of the Fresnel optical surface can be provided on a spherical surface or an aspheric surface according to different light types and condensing characteristics.

 In order to simplify the production, the Fresnel lens is a lens piece formed from a plano-plano optical material, and its image-side optical surface is a planar Fresnel optical surface. Satisfy the condition of (3).

In order to improve the efficiency of the LED assembly, the outer edge surface of the Fresnel lens has a gradient υ.

 In order to be convenient for use selection, the Fresnel lens can be made of optical glass or optical plastic.

ここで、r_nは、フレネル光学面R2の最末環(Last Zone)の半径であり、αは、ＬＥＤチップが発する光線の光透過量であり、βは、像側の無限遠に相対する箇所（100倍f_s）の減衰パラメータを考慮しない光線の光透過量であり、ηは、光透過量の比値η＝β／αであり、E_dは、ＬＥＤチップが発する照度(Incidance)であり、E_1/2は、フレネルレンズが発する最大光強度の半分の箇所の照度である。 Another object of the present invention is to provide an LED assembly, which consists of a plano-concave or double-sided planar Fresnel LED lens and an LED chip, the LED assembly having an elliptical light type and its light transmission amount. The ratio value η satisfies the requirement of 85% () and satisfies the following conditions:

Here, r _n is the radius of the outermost end ring of the Fresnel optical surfaces R2 (Last Zone), α is the amount of light transmission of light LED chip emits, beta is opposite to the infinity on the image side places a light transmission amount of light without considering attenuation parameters (100 × f _s), eta is the ratio value η = β / α of the amount of transmitted light, E _d is LED chip emits illumination (Incidance) E _1/2 is the illuminance at the half of the maximum light intensity emitted by the Fresnel lens.

 Accordingly, the planar Fresnel LED lens of the present invention and the LED assembly formed thereby have an elliptical light type, satisfy the requirement that the ratio of light transmission is greater than 85%, and the lens is thin. It can have characteristics, can be used for single LED or array LED, can be used for lighting or flash of mobile phone, digital camera.

In FIG. 7, the LED assembly 10 of the present invention includes an LED chip 11, a seal layer 12, and a lens 13 in order from the light source side to the image side (forward side) along the central axis Z. After the light beam is emitted from the LED chip 11, the light beam is collected by the lens 13 after passing through the sealing layer 12, and an elliptical light beam symmetric with respect to the central axis Z is formed and irradiated to the image side. The lens 13 is an optical material, for example, a lens formed of optical glass plastic, and its concave surface is the light source side optical surface R1 of the light source, and is an aspherical surface or a spherical surface, and its opposing surface is A Fresnel optical surface R2 which is in the image side direction and has a draft with vertical shape. Optical surface R2 of the lens 13, between the thickness d ₂ and an effective focal length f _s of the lens satisfies the condition of formula (1) and (2), the angle of the light type light intensity lens 13 forms 2ψ (X direction 2φ _x and Y direction 2φ _y ) satisfies the condition of equation (3).

 The sealing layer 12 does not limit the material used, and different materials such as optical resin or silicon gel are commonly used in LED assemblies.

 In FIG. 3, the LED assembly 10 uses a plano-plano Fresnel LED lens 13, where the optical surface R1 on the light source side of the lens 13 is a plane (R1 = ∞) Another optical surface (relative surface) is a planar Fresnel optical surface R2 that is in the image side direction and has vertical ring teeth.

 In FIG. 4, the LED assembly 20 is another type of the present invention, which is an LED assembly 21 in order from the source side to the image side (forward side) along the central axis Z-axis. The main difference between the sealing layer 22 and the double-sided planar Fresnel lens 23 and the LED assembly 10 in FIG. 3 is that the outer peripheral surface of the lens 23 has a gradient ν as shown in FIG. Reduces dissipated light and improves optical efficiency relative to it.

The image-side optical surface R2 of the lens 13 or the lens 23 in the present invention has a plane Fresnel optical surface having a vertical ring shape, as shown in FIGS. 5 and 6, where the Fresnel optical surface R2 may form a transcribed formed from condensing curved surface R _F, Fresnel optical surfaces R2 different and each based on a different transfer method. As shown in FIG. 5, it is a Fresnel optical surface R2 with equal ring pitch (equal zone pitch), that is, the ring pitch (zone pitch) r _t is a fixed value, which is a collection of curved curvature radius R _F. has a light curved (R _F) on mutually equal ring spacing r _t, the different drop (center axis Z point is the highest point), i.e., it has a different ring depths (zone height) h _d, collecting The light curved surface (R _F ) is transferred to a plurality of annular Fresnel image side optical surfaces R2 having equal ring intervals. Also, as shown in FIG. 6, it is an equal zone height Fresnel optical surface R2, that is, the ring depth _hd is a fixed value, which is a condensing light with a radius of curvature R _F. On the curved surface (R _F ), they have mutually equal heads (the central axis Z point is the highest point), that is, have mutually equal ring heights h _d but different ring spacings r _t , The condensing curved surface R _F is transferred to a plurality of annular Fresnel image side optical surfaces R 2 having the same ring depth.

Since each zone of the Fresnel image side optical surface R2 is composed of a slope and a vertical draft, it is referred to as a draft with vertical shape and the radius of the first ring. Is r ₁ and the last ring has a radius r _n . As shown in FIG. 10, when the light beam is incident on the Fresnel optical surface R2, the light effect is achieved by refracting the incident light beam by the inclined surface of each ring and making it a parabolic curved surface (that is, a condensing curved surface).

 10, 11, and 12, the A group rays (for example, A1, A2, A3) are refracted via the Fresnel optical surface R2, and the incident angles of A1, A2, A3 are different as shown in FIG. The emission angle ψ differs at the position on the target as shown in FIG. The group A light beam exhibits a light group having a relatively strong light intensity with respect to the radial position of the central axis after emission. Similarly, after the B group rays (for example, B1, B2, and B3) are refracted via the Fresnel optical surface, they also exhibit a light group having a relatively strong central light intensity. After being combined via the light rays of the A group and the B group, as shown in FIG. 12, the light intensity is uniformly generated, and the intensity of the central region is avoided or reduced excessively. The light in the marginal area is weak, and a bright and dark circle phenomenon occurs.

When the optical surface R1 of the lens 13 or 23 is an aspheric optical surface, the aspheric equation (Aspherical Surface Formula) is the equation (9).

Here, c is the curvature, h is the height of the lens piece, K is a conic constant, and A _{4 to} A ₁₀ are aspherical coefficients (Nth of 4th to 10th floors), respectively. Order Aspherical Coefficient).

The curvature radius R _F of the condensing curved surface of the Fresnel optical surface R2 is defined by Equation (9), where the conic coefficient K = −1 of the converging curved surface curvature radius R _F of the parabolic surface, and the spherical collection The cone coefficient K = 0 of the curvature radius R _F of the optical curved surface.

In FIG. 9, the light beam emitted from the LED chip 11 (21) is condensed through the lens 13 (23), and after refraction, the elliptical light type required at 2ψ angles (X direction 2φ _x and Y direction 2φ _y ). And satisfying the requirement of β / α ≧ 85%, and ignoring attenuation effects such as refraction and scattering of air and satisfying the condition of Equation (7). Accordingly, the present invention uses a plano-concave or double-sided planar Fresnel LED lens and LED chip, and the LED assembly 10 (20) emits an elliptical light mold having a predetermined uniform light intensity, and is used in a single or different light form. Configure.

The preferred embodiment of the present invention will be described below with respect to the actual main components of the present invention, and the application form of each embodiment will be described and compared. The LED chip 11 is 1.85 × 0.77 mm. Use a chip of size, its wavelength is a blue light chip with a maximum intensity (1st peak wave-length) wavelength of 450 nm and a second highest intensity (2nd peak wave-length) wavelength of 550 nm, which is , X direction launch angle ω _x = 39.8 °, Y direction launch angle ω _y = 35.2 °, α = 78.5 lumens (lm), and illuminance E _d = 23.97 lux (Lux ) Blue light. The diameter of the lens 13 (23) is 5 mm (D = 2.5 mm). The image side optical surface R2 selectively has a Fresnel optical surface having equal ring intervals or equal ring depths of vertical ring teeth. The seal layer 12 is a transparent optical silicon gel having a refractive index N _d1 of 1.491. However, regarding the LED assembly of a normal primary lens, the structure other than the lens and LED assembly posted by the present invention belongs to the known art, that is, the dimensions and use of each component of the lens and the LED assembly. The material, LED wavelength and firing angle, Fresnel optical surface type, ring spacing, ring depth, etc. can be varied, modified and even changed with the same effect.

 The following first to seventh embodiments use an LED assembly having a planar Fresnel lens having no gradient and an equal ring depth, and the eighth and ninth embodiments have a gradient and an equal ring depth. The tenth and eleventh embodiments use an LED assembly having a flat Fresnel lens with no gradient and equiangular spacing, and the twelfth and thirteenth embodiments. The example uses an LED assembly having a plano-concave Fresnel lens with no gradient and isometric ring depth.

Further, in the first table shown in each example, the light source side optical surface R1 and the image side optical surface R2 of the LED chip 11, the seal layer 12, and the lens 13 (23) along the central axis Z from the light source side to the image side, respectively. Radius of curvature R (unit: mm) or radius of curvature R _F (unit: mm) of the central axis of the condensing curved surface R _F , distance between each surface di (unit: mm) (the on-axis surface spacing), lens ( 13 and 23) are listed with the gradient υ, each refractive index (N _d ), and have the mark * on the optical surface (S. No.) is an aspherical Fresnel optical surface. The second table component is the coefficient of each term of the aspherical formula (9) of the radius R _P of the Fresnel optical surface, the first Fresnel ring radius r ₁ calculated along the center, the last Fresnel ring radius r _n , The Fresnel ring depth (zone height) _hd and Fresnel ring quantity (No. of zone) are listed.

<First embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is formed of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condensing light rays, and having an elliptical shape of 68 ° in the X direction and 30 ° in the Y direction. It forms a shape, and β = 69.201 lumen at an infinite distance (calculated at 100 times fs) (effects such as air refraction and scattering are not considered). The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Second embodiment>
See FIGS. 7 and 14

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses the light, and is an ellipse with an X direction of 68 ° and a Y direction of 33 °. Forms a shape, and β = 70.245 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Third embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 64 ° in the X direction and 36 ° in the Y direction. Forms a light beam, β = 69.816 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Fourth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a PMMA plastic material having a refractive index N _d2 of 1.491 and an Abbe number ν _d2 of 32, condensing the light, and having an X direction of 68 ° and a Y direction of 43 °. Forms an elliptical light type, β = 72.48 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Fifth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is formed of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 68 ° in the X direction and 43 ° in the Y direction. Forms a shape, and β = 72.48 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Sixth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is formed of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condensing light rays, and having an elliptical shape of 68 ° in the X direction and 43 ° in the Y direction. Forms a light type, β = 72.48 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Seventh embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 65 ° in the X direction and 40 ° in the Y direction. Forms a shape, β = 96.33 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Eighth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 65 ° in the X direction and 60 ° in the Y direction. Forms a light beam, β = 69.588 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Ninth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses the light, and is an ellipse with an X direction of 68 ° and a Y direction of 33 °. Forms a light beam, β = 71.267 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Tenth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses the light rays, and is an ellipse with an X direction of 68 ° and a Y direction of 70 °. Forms a shape, β = 72.056 lumen. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Eleventh embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is made of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 60 ° in the X direction and 80 ° in the Y direction. Forms a shape, and β = 72.164 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Twelfth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is formed of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 60 ° in the X direction and 40 ° in the Y direction. Forms a shape, and β = 69.506 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

<Thirteenth embodiment>
See FIG. 7 and FIG.

In this embodiment, the lens 13 is formed of a glass material having a refractive index N _d2 of 1.582 and an Abbe number ν _d2 of 61.7, condenses light rays, and has an elliptical shape of 60 ° in the X direction and 40 ° in the Y direction. Forms a shape, and β = 69.506 lumens. The following values satisfy the conditional expressions (1), (2), (3) and (7).

1 is a diagram of an LED assembly using a prior art LED lens. FIG. 1 is a diagram of an LED assembly using a prior art LED lens. FIG. FIG. 3 is a three-dimensional view of an LED assembly using a gradient-free Fresnel LED lens of the present invention. FIG. 3 is a three-dimensional view of an LED assembly using the gradient Fresnel LED lens of the present invention. FIG. 4 is a diagram showing the relationship between a Fresnel LED lens using the vertical ring teeth of the present invention and an equal ring interval and a radius of curvature of the light collecting surface. FIG. 5 is a diagram showing the relationship between a Fresnel LED lens using the vertical ring teeth of the present invention and an equal ring depth and a radius of curvature of the light collecting surface. It is a block diagram of the LED assembly of this invention. It is a gradient display figure of the Fresnel LED lens with a gradient. It is an optical path diagram of the LED assembly of the present invention. It is a refraction figure of A group light ray and B group line of the Fresnel LED lens of the present invention. It is an optical path diagram of A group light ray and B group line of the Fresnel LED lens of the present invention. It is explanatory drawing which becomes uniform light intensity combining the A group light ray and B group line of FIG. 10 and FIG. FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction). FIG. 6 is a polar coordinate relationship diagram of LED assembly light intensity distribution and irradiation angle of the first to thirteenth embodiments of the present invention (where “C” represents the X direction and “D” represents the Y direction).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 LED assembly 11, 21 LED chip 12, 22 Seal layer 13, 23 Lens R1 Light source side optical surface or its curvature radius R2 Image side optical surface or its curvature radius R _{F The} curvature radius of the condensing curved surface of the image side Fresnel optical surface

Claims (9)

Used for LED assembly,
The LED assembly is configured by arranging an LED chip, a seal layer, and a lens in order from the light source side to the image side along the central axis.
The lens has an image side optical surface and a light source side optical surface, wherein the image side optical surface is a flat Fresnel optical surface, and the ring surface of the Fresnel optical surface transfers a condensing curved surface. The ring surface has vertical ring teeth, passes light rays emitted from the LED chip through the sealing layer and the lens, and then forms an elliptical irradiation angle light type. Satisfied,

Here, an effective focal length of f _s is the lens, r _n is the radius of the top end ring of the Fresnel optical surfaces, d ₂ is the thickness of the central axis the lens, N _d2 is the refractive index of the lens A planar Fresnel LED lens characterized by that. The lens further satisfies the following conditions:

Where f _s is the effective focal length of the lens, r _n is the radius of the last ring of the Fresnel optical surface, d ₂ is the thickness of the central axis lens, and N _d2 Is the refractive index of the lens, 2φ _x is the angle (degree, deg.) Of half the maximum light intensity in the X direction of the refracted ray of the lens, and 21φ _y is the ray emitted through the lens Is the angle (degree) of half () of the maximum light intensity in the Y direction, 2Lx is the length of the LED chip in the X direction, 2Ly is the length of the LED chip in the Y direction, and fg is , R ₁ is the radius of curvature of the light source side optical surface, R _F is the radius of curvature of the condensing curved surface of the image side Fresnel optical surface, and d ₀ is the LED chip's relative focal length. 2. The planar Fresnel LED lens according to claim 1, wherein d ₁ is a thickness of a sealing layer of a central axis, and D is a radius of an image side optical surface of the lens. 2. The planar Fresnel LED lens according to claim 1, wherein the light source side optical surface of the lens is either a flat surface or a concave surface. 2. The planar Fresnel LED lens according to claim 1, wherein a condensing curved surface of the Fresnel optical surface used for the transfer formation is either a spherical surface or an aspherical surface. The planar Fresnel LED lens according to claim 1, wherein the Fresnel optical surface is either a Fresnel optical surface having an equal ring depth or a Fresnel optical surface having an equal ring interval. The planar Fresnel LED lens according to claim 1, wherein an outer edge surface of the lens has a gradient. The planar Fresnel LED lens according to claim 1, wherein the lens is formed of either a plastic optical material or a glass optical material. An LED assembly comprising a planar Fresnel LED lens according to any one of claims 1 to 7, a seal layer, and an LED chip arranged in order from a light source side to an image side along a central axis. ,
The LED assembly generates an elliptical light type, and satisfies the following conditions:

Where r _n is the radius of the last ring of the Fresnel optical surface, and 2φ _x is the angle (degree, deg.) At half the maximum light intensity in the X direction of the refracted ray of the lens. 2φ _y is the angle (degree) of the half I _1/2 portion of the maximum light intensity in the Y direction of the emitted light that has passed through the lens, α is the light transmission amount of the light emitted by the LED chip, and β Is the light transmission amount of the light ray that does not consider the attenuation parameter of the portion (100 times f _s ) relative to the infinity on the image side, η is the light transmission amount ratio η = β / α, and E _d is An LED assembly characterized by the illuminance emitted by the LED chip. The ratio of the light transmission amount of the light emitted from the LED assembly and the light transmission amount at the relative infinity position on the image side satisfies the following conditions:
β / α ≧ 85%
Here, α is a light transmission amount of the light emitted from the LED assembly, and β is a light transmission amount neglecting effects such as refraction and scattering of air at a relative infinite point on the image side of the LED assembly. Item 9. The LED assembly according to Item 8.

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