CN201401725Y - Fresnel LED (light-emitting diode) lens and LED component comprised thereby - Google Patents

Abstract

The utility model provides a Fresnel LED (light-emitting diode) lens and an LED component comprised thereby. The Fresnel LED lens is the lens which is provided with a plurality of Fresnel optical surfaces with draft with vertical shapes; furthermore, all Fresnel optical surfaces are linearly arranged relatively to the center of the LED, can gather the light beams emitted by the LED wafers and generate the patterns with quasi-circle distribution peak intensity so as to meet the special optical conditions; the Fresnel LED lens and the corresponding LEDs can compose an LED component so as to be used as a luminescence source and used for illumination, handset flashlights or camera flashlights.

Description

Fresnel light emitting diode eyeglass and the light-emitting diode component that is constituted thereof

Technical field

Light emitting diode (LED) assembly (Fresnel LED Lens and LED Assembly Thereof) that the utility model relates to a kind of Fresnel light emitting diode (LED) eyeglass and constituted, especially refer to a kind of Fresnel light emitting diode eyeglass with a plurality of Fresnel optical surfaces and the arrangement of row's shape, one-tenth one illuminating source capable of being combined is for can be applicable to illumination, mobile phone flash lamp or camera flash-light.

Background technology

Light emitting diode (light emitting diode is called for short LED) has low-voltage, low power consumption, long advantage of life-span, has been widely used in display unit (indicator), lighting device fields such as (illuminator).Compared to traditional light emitting source, the light that the LED wafer sends is comparatively dispersed, and centralized lighting or evenly illumination on a large scale among a small circle often need to use optical mirror slip.In the design of LED optical mirror slip, can be divided into an optical mirror slip (primary optical lens) and secondary optics eyeglass (secondaryoptical lens); An optical mirror slip is the lens that directly encapsulate on the LED wafer, generally to assemble (concentrate) light; The secondary optics eyeglass uses at single or number LEDs array (Array), to disperse or uniform beam.On existing secondary optics lens design, can reduce the secondary optics lens thickness and the most commonly used with Fresnel formula eyeglass; For the Fresnel formula optical mirror slip of single LEDs as shown in Figure 1 and Figure 2, light emitting diode 21 emits beam, be projected to object via 23 gatherings of Fresnel formula optical mirror slip, as Japan Patent JP2005257953, tw Taiwan patent M347533, M347534, U.S. Pat 6,726,859; For the Fresnel formula optical mirror slip of led array as shown in Figure 3, Figure 4, as U.S. Patent Publication No. US2007/0275344, US2008/0158854, US2002/0025157, US2007/0034890, European patent EP 1091167 etc.

Flash lamp for digital camera (Digital Still Camera), camera computer (PC camera), network cameras (Network camera), mobile phone products such as (mobile phones), be power saving and light purpose, use LED to be applied on the flash lamp, and Chang Yidan or plurality of LEDs composition array, cover again and go up the secondary optics eyeglass, illumination and luminous intensity can be tried one's best evenly; Yet in the formed smooth type of distribution of light intensity, then with evenly for requiring, and to throw light on or the flash lamp use near the most suitable being used in of circular light type, so that the light that Fresnel formula secondary optics eyeglass can make LED send reaches peak efficiency, this is novel promptly under this active demand, develops secondary optics eyeglass that a Fresnel Lenses makes producing specific approaching round smooth type, and by to form the LED assembly, to constitute flash lamp, offer illumination, mobile phone flash lamp or camera flash-light and use.

Summary of the invention

The light-emitting diode component that main purpose of the present utility model provides a kind of Fresnel light emitting diode eyeglass and constituted, its one-tenth one illuminating source capable of being combined can be applicable to illumination, mobile phone flash lamp or camera flash-light.

In order to achieve the above object, the light-emitting diode component that the utility model provides a kind of Fresnel light emitting diode eyeglass and constituted, described light-emitting diode component (LED assembly) is equidistantly to be arranged to emit beam with straight line by a plurality of light emitting diodes (LED), one circuit board is installed described a plurality of LED in order to combination, one Fresnel light emitting diode eyeglass forms near circular light type with collected light and with even luminous intensity and is constituted, wherein, described Fresnel light emitting diode eyeglass is the formed eyeglass of optical material, have a light source-side optical face and a thing side optical surface, and light source-side optical face and thing side optical surface are the plane; Thing side optical surface is provided with the Fresnel optical surface with quantity such as LED again, and each LED center is parallel to each other with the corresponding formed central shaft of the Fresnel optical surface line of centres; The optically focused curved surface of described again Fresnel optical surface is an aspheric surface, and its anchor ring is perpendicular rings tooth (draft with vertical shape) and the ring degree of depth (equalzone height) such as can be, and can meet the following conditions:

$0.7\≤\frac{f_s}{r_n}\≤2.2---\left(1\right)$

$0.1\≤(N_{d2}-1)\frac{d_2}{f_s}\≤1.25---\left(2\right)$

$\sqrt{{\left(\frac{{\mathrm{\φ}}_x-{\mathrm{\ω}}_x}{\mathrm{\π}}\right)}^2+{\left(\frac{{\mathrm{\φ}}_y-{\mathrm{\ω}}_y}{\mathrm{\π}}\right)}^2}\·f_g\≤0.6---\left(3\right)$

Wherein:

$f_g=|(\frac{1}{R_1}-\frac{1}{R_F})\·f_s|---\left(4\right)$

${\mathrm{\&omega;}}_x={\tan }^{-1}\left(\frac{D}{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="Y2009201493080020H1.png,Y2009201493080021H1.png"\; state="\{\{state\}\}">d</figure-callout>}0+d1+\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="Y2009201493080017H2.png,Y2009201493080020H1.png"\; state="\{\{state\}\}">d</figure-callout>}2+\mathrm{Lx}}\right)---\left(5\right)$

${\mathrm{\&omega;}}_y={\tan }^{-1}\left(\frac{D}{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="Y2009201493080020H1.png,Y2009201493080021H1.png"\; state="\{\{state\}\}">d</figure-callout>}0+d1+\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="Y2009201493080017H2.png,Y2009201493080020H1.png"\; state="\{\{state\}\}">d</figure-callout>}2+\mathrm{Ly}}\right)---\left(6\right)$

Wherein, f _sBe the effective focal length (effective focal length) of Fresnel light emitting diode eyeglass, d ₀Be LED wafer thickness, d ₁Be the sealing thickness of central shaft, d ₂Be central shaft light emitting diode lens thickness, r _nBe the most last ring (Last Zone) radius of Fresnel optical surface S2,2 φ _xFor penetrate the angle (degree deg.) of light at half place of highlight strength (intensity) of directions X, 2 φ through Fresnel light emitting diode eyeglass _yFor penetrate the angle (degree deg.) of light through Fresnel light emitting diode eyeglass at half place of highlight strength of Y direction, 2Lx is the length of LED wafer at directions X, 2Ly is the length of LED wafer in the Y direction, fg is the suitable focal length (relative focal length) of Fresnel light emitting diode eyeglass, R ₁Be the radius of curvature of light source-side optical face, R _FBe the radius of curvature (radius of fresnelconvex surface) of the optically focused curved surface of picture side Fresnel optical surface, D is the maximum radius of Fresnel light emitting diode eyeglass at single Fresnel optical surface.

Another purpose of the utility model is selected conveniently in order to use, and Fresnel light emitting diode eyeglass can be optical glass or the optics plastic cement is made.

The utility model purpose again is to provide a kind of light-emitting diode component, comprise two or more (at least two) light emitting diodes, each light emitting diode with equidistant permutation and combination in upright arrangement on circuit board, the center of each light emitting diode is parallel to each other with the formed central shaft of line at each corresponding Fresnel optical surface center of Fresnel light emitting diode (LED) light eyeglass, and described light-emitting diode component has near circular light type, the minor axis length in the cross section of described smooth type and the ratio of long axis length are greater than 0.8, or the ratio of long axis length and minor axis length promptly meets the following conditions less than 1.25:

$0.8\&le;\mathrm{\&kappa;}=\frac{{\mathrm{\&phi;}}_y}{{\mathrm{\&phi;}}_x}\&le;1.25---\left(7\right)$

Wherein, 2 φ _xFor penetrate the angle (degree deg.) of light at half place of highlight strength of directions X, 2 φ through Fresnel light emitting diode eyeglass _yFor penetrate the angle (degree deg.) of light at half place of highlight strength of Y direction through Fresnel light emitting diode eyeglass, κ is φ _yWith φ _xRatio.

Another purpose of the present utility model is to provide a kind of light-emitting diode component, and it is to comprise as Fresnel light emitting diode eyeglass described in the utility model, and this light-emitting diode component has near circular light type, its luminous flux ratio η greater than 60% requirement:

$\mathrm{\&eta;}=\frac{\mathrm{\&beta;}}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i}\&GreaterEqual;60\%---\left(8\right)$

Wherein, α _iBe the luminous flux that i light emitting diode (LED) emits beam, The summation of the luminous flux that emits beam for n light emitting diode (LED), β is the relative unlimited distance of picture side (100 times of f _s) do not consider the luminous flux of the light of AF.

The beneficial effects of the utility model are, Fresnel light emitting diode eyeglass of the present utility model and the light-emitting diode component that is constituted thereof can produce near circular light type, and meet luminous flux ratio greater than 60% requirement, and described light-emitting diode component has the characteristic of thin thickness, can provide the flash lamp of illumination or mobile phone, camera to use.

Description of drawings

Fig. 1 is that an existing use optical mirror slip is in the schematic diagram of LED assembly (single LEDs);

Fig. 2 is that existing another uses optical mirror slip in the schematic diagram of LED assembly (single LEDs);

Fig. 3 is that an existing use optical mirror slip is in the schematic diagram of LED assembly (array LED);

Fig. 4 is that existing another uses optical mirror slip in the schematic diagram of LED assembly (array LED);

Fig. 5 is the side cross-sectional schematic of light-emitting diode component first example structure of the present utility model;

Fig. 6 is the use symbol description figure of Fresnel light emitting diode eyeglass of the present utility model and light-emitting diode component;

Fig. 7 is the schematic perspective view of Fresnel light emitting diode eyeglass first embodiment of the present utility model;

Fig. 8 be Fig. 7 the light emitting diode eyeglass on look schematic diagram;

Fig. 9 is a section (hatching line 9-9) schematic diagram of the light emitting diode eyeglass of Fig. 8;

Figure 10 is the side cross-sectional schematic of light-emitting diode component second example structure of the present utility model;

Look schematic diagram on the light emitting diode eyeglass among Figure 11 Figure 10;

Figure 12 is a section (hatching line 12-12) schematic diagram of the light emitting diode eyeglass of Figure 11;

Figure 13 is the light intensity distributions and the polar coordinates graph of a relation (wherein A represents directions X, and B represents the Y direction) that shines the angle of the employed light emitting diode of the utility model first embodiment;

Figure 14 is the light intensity distributions and the polar coordinates graph of a relation (wherein A represents directions X, and B represents the Y direction) that shines the angle of the utility model first embodiment light-emitting diode component;

Figure 15 is the light intensity distributions and the polar coordinates graph of a relation (wherein A represents directions X, and B represents the Y direction) that shines the angle of the employed light emitting diode of the utility model second embodiment; And

Figure 16 is the light intensity distributions and the polar coordinates graph of a relation (wherein A represents directions X, and B represents the Y direction) that shines the angle of the utility model second embodiment light-emitting diode component;

Description of reference numerals: 11-light emitting diode (LED); 111-LED wafer (LED die); 112-sealing (LED seal gel); 13-Fresnel light emitting diode eyeglass (Fresnel LED lens); 130-light source-side optical face (optical surface on source side); 131-thing side optical surface (opticals urface on forward side); 131a～131f-Fresnel optical surface (a～and f) (Fresnel optical surface a～f); 132-groove (Flange); 133-draw-in groove (Wedge); 12-circuit board (PCB); 121-conducting strip (Electric pad); 14 perpendicular rings teeth (draft withvertical shape); R1 light source-side optical face (optical surface on source side) or its radius of curvature (radius on optical axis); R2 is as side optical surface (optical surface onforward side) or its radius of curvature (radius on optical axis); R _FThe optically focused curvature of curved surface radius (radius of fresnel convex surface) of picture side Fresnel optical surface; LED adhesive-layer thickness on the d0 central shaft (thickness of seal gel on optical axis); LED adhesive-layer surface is to the optical surface distance of Fresnel light emitting diode eyeglass light source side on the d1 central shaft; (thickness fromdie surface to R1 on optical axis); D2 central shaft Fresnel light emitting diode lens thickness (lens thickness on optical axis); r ₁The first ring radius (first zone radius); r _nThe most last ring radius (last zone radius); r _tRing spacing (zone pitch); Hd encircles the degree of depth (zoneheight); N _dRefractive index (Refractive index); α _iI the luminous flux (Flux) that LED emits beam; β is as the luminous flux (Flux) of the relative unlimited distance light of side; κ is φ _yWith φ _xRatio.

The specific embodiment

For making the utility model clear and definite more full and accurate, now enumerate preferred embodiment and cooperate following graphicly, structure of the present utility model and technical characterictic are described in detail as the back:

With reference to shown in Figure 5, it is the structural representation of Fresnel light emitting diode eyeglass of the present utility model and the light-emitting diode component 10 that constituted thereof, comprises a plurality of equidistantly LED 11, a circuit board 12 and Fresnel light emitting diode eyeglasses 13 arranged in a straight line; Wherein, Fresnel light emitting diode eyeglass 13 has a light source-side optical face 130 and a thing side optical surface 131, and thing side optical surface 131 is provided with the Fresnel optical surface 131a～131e with quantity such as LED 11; Wherein, circuit board 12 further is provided with conducting strip 121, can electric current be fed each LED 11 by conducting strip, and LED 11 is emitted beam; LED 11 further comprises LED wafer 111 and sealing 112, when light is sent by LED wafer 111, after sealing 112, through air layer enter light source-side optical face 130, again by Fresnel optical surface 131a～131e with light-ray condensing and forms the light beam of light type near circle.

Please refer to Fig. 6, is Zb along LED 11 centers with the corresponding formed central shaft of the Fresnel optical surface 131b line of centres, and the thickness of sealing 112 is d0, and air layer thickness is d1, and light source-side optical face 130 to Fresnel optical surface 131b thickness is d2; Fresnel optical surface 131b has perpendicular rings tooth (draft withvertical shape) 134 and the Fresnel optical surface of the ring degree of depth (equal zone height) such as can be; The radius of first ring tooth is r ₁(diameter is 2r ₁), the most last ring tooth radius is r _n, the ring tooth height is h _d, the spacing of each ring tooth is r _tSatisfy the condition of formula (1) and formula (2).

Wherein, sealing 112 does not limit employed material, optical resin (resin) commonly used or silica gel different materials such as (silicon gel) on LED 11; And Fresnel light emitting diode eyeglass 13 can be made by optical glass or optics plastic material.

Shown in Figure 9 with reference to figure 7-, Fresnel light emitting diode eyeglass 13 is provided with a groove 132 and a draw-in groove 133, groove 132 is in order to ccontaining circuit board 12 and located, make on the circuit board 12 a plurality of LED 11 can with Fresnel light emitting diode eyeglass 13 on (131a～131e) aligns the center one by one with the Fresnel optical surface of quantity; Draw-in groove 133 is in order to make up with camera or other devices.

LED wafer 111 emits beam, and through the Fresnel optical surface 131a～131e of Fresnel light emitting diode eyeglass 13, gathering and refraction back are with 2 φ angles (directions X 2 φ _xWith Y direction 2 φ _y) form needed near the circular light type and satisfy the requirement of beta/alpha 〉=85%, wherein, the luminous flux that α emits beam for the LED wafer, β is the luminous flux of the picture relative unlimited distance of side (100 times of fs) light, and ignores the refraction (refraction) and scattering effects such as (scattering) of air.

The optically focused curved surface of Fresnel optical surface, if constituted with the aspherics face, its aspheric equation (Aspherical Surface Formula) is formula (9)

$Z=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="Y2009201493080017H2.png,Y2009201493080020H1.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+\sqrt{(1-(1+K)c^2{h}^2)}}+A_4{h}^4+A_6{h}^6+A_8{h}^8+A_{10}{h}^{10}---\left(9\right)$

Wherein, c is a curvature, and h is the eyeglass height, and K is circular cone coefficient (Conic Constant), A ₄, A ₆, A ₈, A ₁₀The asphericity coefficient (Nth Order AsphericalCoefficient) on difference four, six, eight, ten rank.

The optically focused curvature of curved surface radius (R of Fresnel optical surface 131a～131e _F) also with formula (9) definition, for paraboloidal optically focused curvature of curved surface radius (R _F) circular cone COEFFICIENT K=-1, for the optically focused curvature of curved surface radius (R of sphere _F) circular cone COEFFICIENT K=0.

The following most preferred embodiment that is disclosed of the utility model is to explain at the main composition element of the utility model reality, and the ring tooth that waits the ring degree of depth that Fresnel optical surface 131a～131f selects to have the perpendicular rings tooth is explanation; Sealing 12 is to utilize refractive index N _D1Transparent optical silica gel by 1.41 is clogged.But with regard to the LED assembly that generally has optical mirror slip and constituted, except Fresnel light emitting diode eyeglass that the utility model disclosed and the light-emitting diode component that constituted thereof, other structures are the technology of General Notifications, pattern, ring spacing and the ring degree of depth etc. of the size of each composed component of just described optical mirror slip and LED assembly thereof, use material, LED wavelength and emission angle, Fresnel optical surface are to carry out many changes, modification even equivalence change.

＜the first embodiment 〉

Please refer to shown in Fig. 5, Fig. 7-9 and Figure 13,14, it is respectively the first example structure schematic diagram of Fresnel light emitting diode eyeglass of the present utility model and the light-emitting diode component that constituted thereof and light intensity distributions thereof and according to the polar coordinates graph of a relation at angle.

Show respectively in the following tabulation () by light source side to the picture side along the radius R of the sealing 112 of the LED wafer 111 of central shaft Z, the Fresnel optical surface of Fresnel light emitting diode eyeglass 13 (the central shaft optically focused curvature of curved surface radius R of 131a～131e) _F(mm), thickness spacing di (mm) (the on-axis surfacespacing), each refractive index (N _d), the effective focal length fs (effective focal length) of Fresnel optical surface etc.; In table (), optical surface (Surf.No.) has mark * person to be aspheric Fresnel optical surface again.

Table (one)

Following tabulation (two) is a Fresnel optical surface radius R _PAspheric surface in every coefficient of formula (8), the first Fresnel ring radius r of starting at along the center ₁, the most last Fresnel ring radius r _n, the Fresnel ring degree of depth (zoneheight) h _dAnd Fresnel number of rings amount (No.of zone):

Table (two)

In the present embodiment, Fresnel light emitting diode eyeglass 13 is to utilize refractive index N _D2Be that 1.587 plastic cement material is made, (131a～131e), five LED 11 adopt 1.12 * 1.12mm sizes, at directions X angle of departure ω at thing side optical surface 131 five Fresnel optical surfaces to be set _x=31.5 °, Y direction angle of departure ω _y=31.5 °, α=6.9 lumens (lm), the light intensity distributions of the LED of use concerns as shown in figure 13 with the polar coordinates that shines the angle; Five LED 11 are arranged on the circuit board 12 in mode arranged in a straight line, the center distance L=3.0 (mm) of two adjacent LED 11, i.e. two adjacent Fresnel optical surfaces (the center distance L=3.0 (mm) of 131a～131e); It is interior fixing that circuit board 12 is installed in the groove 132 of Fresnel light emitting diode eyeglass 13, (131a～131e) the formed central shaft of the line at center (Zb) is parallel to each other, and promptly five central shafts (Zb) are parallel to each other to make each LED 11 center and Fresnel optical surface.Circuit board 12 joins with extraneous electric power polarity by two conducting strips 121.After imposing electric current, through conducting strip 121 and circuit board 12, five LED11 are emitted beam, light is through the Fresnel optical surface of this Fresnel light emitting diode eyeglass 13 (after 131a～131e) assembles, sentence 40.5 ° of directions Xs, 35 ° of approaching circular angles of shining of Y direction in maximal illumination 1/2, the κ value is greater than 0.8, and as shown in figure 14, it is the light intensity distributions and the polar coordinates graph of a relation that shines the angle of the LED assembly 10 of present embodiment; At β=32.5 lumens of unlimited distance (being) (ignoring effects such as the refraction of air and scattering) in 100 times of fs; Formula (1), (2), (3) and (7) are respectively:

$\frac{f_s}{r_n}=1.102$

$(N_{d2}-1)\frac{d_2}{f_s}=0.1198$

$\sqrt{{\left(\frac{{\mathrm{\&phi;}}_x-{\mathrm{\&omega;}}_x}{\mathrm{\&pi;}}\right)}^2+{\left(\frac{{\mathrm{\&phi;}}_y-{\mathrm{\&omega;}}_y}{\mathrm{\&pi;}}\right)}^2}\&CenterDot;f_g=0.5397$

φ _x＝20.25°

φ _y＝17.5°

$\mathrm{\&kappa;}=\frac{{\mathrm{\&phi;}}_y}{{\mathrm{\&phi;}}_x}=0.864$

$\mathrm{\&eta;}=\frac{\mathrm{\&beta;}}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i}=94.2\%$

The formula that can satisfy condition (1), (2), (3), (7) and (8).

By above-mentioned table (), table (two) and shown in Figure 14, the light-emitting diode component 10 that provable thus the utility model utilizes Fresnel light emitting diode eyeglass 13 to be constituted has high efficiency and can produce predetermined near the circular light type, the luminous intensity of its each angle is even, can promote application of the present utility model.

＜the second embodiment 〉

Please refer to shown in Figure 10-12 and Figure 15,16, it is respectively the second example structure schematic diagram of Fresnel light emitting diode eyeglass of the present utility model and the light-emitting diode component that constituted thereof and light intensity distributions thereof and according to the polar coordinates graph of a relation at angle.

Show respectively in the following tabulation (three) by light source side to the picture side along the radius R of the sealing 112 of the LED wafer 111 of central shaft Z, the Fresnel optical surface of Fresnel light emitting diode eyeglass 13 (the central shaft optically focused curvature of curved surface radius R of 131a～131f) _F(mm), thickness spacing di (mm) (the on-axis surfacespacing), each refractive index (N _d) etc.; In table (), optical surface (Surf.No.) has mark * person to be aspheric Fresnel optical surface again.。

Table (three)

Following tabulation (four) is a Fresnel optical surface radius R _PAspheric surface in every coefficient of formula (9), the first Fresnel ring radius r of starting at along the center ₁, the most last Fresnel ring radius r _n, the Fresnel ring degree of depth (zoneheight) h _dAnd Fresnel number of rings amount (No.of zone):

Table (four)

In the present embodiment, Fresnel light emitting diode eyeglass 13 is to utilize refractive index N _D2Be that 1.8 glass material is made, (131a～131f), six LED 11 adopt the LED 11 of 1.85 * 0.77mm sizes, its directions X angle of departure ω at thing side optical surface 131 six Fresnel optical surfaces to be set _x=38.25 °, Y direction angle of departure ω _y=29.25 °, α=78.5 lumens (lm), LED 11 text of an annotated book light intensity distributions of use concern as Figure 15 with the polar coordinates that shines the angle; Six LED 11 are arranged on the circuit board 12 in mode arranged in a straight line, the center distance L=4.0 (mm) of two adjacent LED 11, i.e. two adjacent Fresnel optical surfaces (the center distance L=4.0 (mm) of 131a～131f).When six LED 11 emit beam, light is through the Fresnel optical surface of this Fresnel light emitting diode eyeglass 13 (after 131a～131f) assembles, sentence 63 ° of directions Xs, 54 ° of approaching circular angles of shining of Y direction in maximal illumination 1/2, the κ value is greater than 0.8, as shown in figure 16, it is the light intensity distributions and the polar coordinates graph of a relation that shines the angle of the LED assembly 10 of present embodiment; In β=326.8 lumens of unlimited distance (being) (ignoring effects such as the refraction of air and scattering) in 100 times of fs; Formula (1), (2), (3), (7) and formula (8) are respectively:

$\frac{f_s}{r_n}=1.153$

$(N_{d2}-1)\frac{d_2}{f_s}=0.1145$

$\sqrt{{\left(\frac{{\mathrm{\&phi;}}_x-{\mathrm{\&omega;}}_x}{\mathrm{\&pi;}}\right)}^2+{\left(\frac{{\mathrm{\&phi;}}_y-{\mathrm{\&omega;}}_y}{\mathrm{\&pi;}}\right)}^2}\&CenterDot;f_g=0.2744$

φ _x＝31.5°

φ _y＝27.0°

$\mathrm{\&kappa;}=\frac{{\mathrm{\&phi;}}_y}{{\mathrm{\&phi;}}_x}=0.873$

$\mathrm{\&eta;}=\frac{\mathrm{\&beta;}}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i}=\mathrm{69.38.2}\%$

The formula that can satisfy condition (1), (2), (3), (7) and (8).Figure 14 is the LED assembly light intensity distributions and the polar coordinates graph of a relation that shines the angle of present embodiment.

The light-emitting diode component 10 that utilizes Fresnel light emitting diode eyeglass 13 to be constituted by the provable the utility model of the various embodiments described above has high efficiency and can produce predetermined near the circular light type, the luminous intensity of its each angle is even, and the utility model can be used for throwing light on or the different application such as flash lamp of camera.

More than shown in only be preferred embodiment of the present utility model, only be illustrative for the utility model, and nonrestrictive.Have common intelligence knowledge personnel in the present technique field and understand, in these spirit and scope that novel claim limited, can carry out many changes, modification even equivalence change, but all will fall in the interest field of the present utility model it.

Claims (5)

1, a kind of Fresnel light emitting diode eyeglass is for being covered in a plurality of one-tenth light emitting diode top equidistantly arranged in a straight line; Described light emitting diode eyeglass is characterised in that:

Described light emitting diode eyeglass has a picture side optical surface and a light source-side optical face, wherein said light source-side optical face is a plane, describedly be a plane and be provided with and quantity such as described light emitting diode and equidistant a plurality of corresponding Fresnel optical surface arranged in a straight line that as the side optical surface each described light-emitting diodes tube hub is equidistant each other and parallel with the corresponding formed central shaft of the Fresnel optical surface line of centres;

Wherein, the anchor ring of described Fresnel optical surface has the perpendicular rings tooth, so that the light that described light emitting diode sent arranged in a straight line forms the light type near circle behind described light emitting diode eyeglass, and described Fresnel optical surface meets the following conditions:

$0.7\&le;\frac{f_s}{r_n}\&le;2.2$

$0.1\&le;(N_{d2}-1)\frac{d_2}{f_s}\&le;1.25$

Wherein, f _sEffective focal length, r for this light emitting diode eyeglass _nThe most last ring radius, d for the Fresnel optical surface ₂Be central shaft light emitting diode lens thickness, N _D2Refractive index for the light emitting diode eyeglass.

2, Fresnel light emitting diode eyeglass according to claim 1 is characterized in that, described Fresnel optical surface further meets the following conditions:

$\sqrt{{\left(\frac{{\mathrm{\&phi;}}_x-{\mathrm{\&omega;}}_x}{\mathrm{\&pi;}}\right)}^2+{\left(\frac{{\mathrm{\&phi;}}_y-{\mathrm{\&omega;}}_y}{\mathrm{\&pi;}}\right)}^2}\&CenterDot;f_g\&le;0.6$

Wherein:

$f_g=|(-\frac{1}{R_F})\&CenterDot;f_s|$

${\mathrm{\&omega;}}_x={\tan }^{-1}\left(\frac{D}{d0+d1+d2+\mathrm{Lx}}\right)$

${\mathrm{\&omega;}}_y={\tan }^{-1}\left(\frac{D}{d0+d1+d2+\mathrm{Ly}}\right)$

Wherein, f _sBe the effective focal length of Fresnel light emitting diode eyeglass, d ₀Be LED wafer thickness, d ₁Be the sealing thickness of central shaft, d ₂Be central shaft light emitting diode lens thickness, 2 φ _xFor penetrate the angle of light at half place of highlight strength of directions X, 2 φ through Fresnel light emitting diode eyeglass _yFor penetrate the angle of light at half place of highlight strength of Y direction through Fresnel light emitting diode eyeglass, 2Lx is the length of LED wafer at directions X, and 2Ly is the length of LED wafer in the Y direction, and fg is the suitable focal length of Fresnel light emitting diode eyeglass, R ₁Be the radius of curvature of light source-side optical face, R _fBe the optically focused curvature of curved surface radius of picture side Fresnel optical surface, D is the maximum radius of Fresnel light emitting diode eyeglass at single Fresnel optical surface.

3, Fresnel light emitting diode eyeglass according to claim 1 is characterized in that, described optical mirror slip is by a kind of made in plastic optical material and the glass optical material.

4, a kind of light-emitting diode component comprises the described Fresnel light emitting diode (LED) light of each claim eyeglass, a circuit board and an a plurality of light emitting diode according to claim 1 to 3; It is characterized in that:

Described a plurality of light emitting diode with equidistant permutation and combination in upright arrangement on described circuit board, the formed central shaft of the line of centres of the Fresnel optical surface of the center of described each light emitting diode and described Fresnel light emitting diode (LED) light eyeglass is parallel to each other, and described light-emitting diode component has near circular light type, and meets the following conditions:

$0.8\&le;\mathrm{\&kappa;}=\frac{{\mathrm{\&phi;}}_y}{{\mathrm{\&phi;}}_x}\&le;1.25$

Wherein, 2 φ _xFor penetrate the angle of light at half place of highlight strength of directions X, 2 φ through Fresnel light emitting diode eyeglass _yFor penetrate the angle of light through Fresnel light emitting diode eyeglass at half place of highlight strength of Y direction.

5, light-emitting diode component according to claim 4 is characterized in that, described light-emitting diode component meets the following conditions:

$\mathrm{\&eta;}=\frac{\mathrm{\&beta;}}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i}\&GreaterEqual;60\%$

Wherein, α _iBe i the luminous flux that light emitting diode emits beam,

The summation of the luminous flux that emits beam for n light emitting diode, β is the relative 100 times of f of picture side _sThe place does not consider the luminous flux of the light of AF.

Images