CN101684916B - Optical module with changeful curvature - Google Patents
Optical module with changeful curvature Download PDFInfo
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- CN101684916B CN101684916B CN2008102114251A CN200810211425A CN101684916B CN 101684916 B CN101684916 B CN 101684916B CN 2008102114251 A CN2008102114251 A CN 2008102114251A CN 200810211425 A CN200810211425 A CN 200810211425A CN 101684916 B CN101684916 B CN 101684916B
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Abstract
The invention relates to an optical module with changeful curvature, which comprises an optical diaphragm and a light source array. The optical diaphragm comprises a plurality of concave lenses and a plurality of convex lenses, wherein the concave lenses and the convex lenses are mutually staggered and arranged along at least one direction, the concave lenses have a concave lens width along the direction, and the convex lenses have a convex lens width along the direction. The concave lens has a maximum depth vertical to the direction, the convex lens has a maximum height vertical to the direction, wherein the maximum depth is greater than half of the concave lens width, and the maximum height is greater than half of the convex lens width. The light source array is formed by arranging a plurality of light emitting diodes, wherein the concave lens width is not equal to the convex lens width.
Description
Technical field
The optical module that the present invention is spread relevant for a kind of light that utilizes concavees lens and the staggered blooming piece of convex lens to make light emitting diode matrix.
Background technology
(Light Emitting Diode LED), can be applied in the lighting field light emitting diode that efficient day by day increases gradually; Yet when LED brightness constantly increases; The light intensity of single spot zone increases relatively, and high-intensity led light source uses the problem that dazzle is arranged in illumination; Promptly can make people's eyes produce long persistence of vision phenomenon, cause the discomfort of vision even reach disabled state.Simultaneously because the directive property of LED is higher, the center brightness that is right against the LED vertical direction with arround luminance difference excessive, be unfavorable for illumination application.On the other hand; Though the efficient of single LEDs has broken through the high-level efficiency stage of 80lm/W, with illumination, can't accomplish that also single LEDs can provide the total light flux of 500lm for general; So general the use gone up and must be used in combination by a plurality of LED; A plurality of LED combinations can produce the image of multiple projection, are also referred to as light line or ghost image.Multiple projection phenomenon can let the user feel dazzled, and influence is read or write, and general LED lamp box solves dazzle and ghost image mode, is LED to be concentrated arrange as far as possible, or installs diffuser plate additional.LED concentrates to arrange and is unfavorable for heat radiation and luminescence efficiency, and glare problem also still can be very serious; Installing diffuser plate additional can significantly reduce optical efficiency, makes the situation that luminous flux is not enough originally more serious, must increase the LED number, and heat dissipation problem is more serious as a result, also significantly increases cost, produces vicious cycle.Except diffuser plate, the diffusion barrier that utilizes high mist degree is can't the LED luminous point of highlight strength be broken up, and can not prevent the problem of above LED in illumination.
What lighting required is simple structure and optical efficiency, can't can utilize the mode of multilayer film to handle the homogeneity and the brightness of light source as backlight module, must take the mode of monolithic; Can be compared to the general structure dress of diffuser plate and use simply, the LED lighting has the design of many secondary optics in the use; Come the light source of homogenising led array, part secondary optics design demand combines with the LED particle, for example optics cap etc.; Can increase cost and complexity that LED makes in the use, but be still single led light source, a kind of in addition then is the mode of design plane mirror or micromirror; To each LEDs; In accurate localization and the burnt effect that can reach light diffusion or collimated light of gathering, to reduce the number of cheaply on the lighting use be to be difficult for popularizing to such structure reload request stressing, in addition on the function of the micromirror of single kenel; The optical path of local light refraction with secondary reflection only can be provided, can not be with the effective large-area homogenising of highdensity light source.
The open case US20050264716 of United States Patent (USP) discloses a kind of led light source module that is formed by prismatic mirror, micromirror array and LED arrangement, directly on the LED substrate, makes the large-scale eyeglass of millimeter grade, and led array needs contraposition to locate at the tip of lens array; The LED light diffusion site on the substrate of rebounding after just can the birefringence via tip place is carried out scattered reflection again, and the light diffusion is reflected with being blended in; Its shortcoming is that LED and micromirror need contraposition; If closely light source is at non-sharp corner, light will directly reflect, and can't reach the effect of diffusion mixed light; Repeatedly also loss light source in a large number of anaclasis in the glue material between eyeglass and substrate; Eyeglass and LED substrate also can be because of accumulation of heat, and the eyeglass temperature is raise, and material degradation is quickened.
The open case US20050265029 of United States Patent (USP); For the notion of utilizing multilayer with LED substrate and reflection horizon and level crossing optical film storehouse; Penetration Thickness Control and clearance control can reach optical efficiency preferably; With the reflection problems that need not handle the LED surface, but equally also be to carry out the contraposition of level crossing focus.
World patent WO2007050274 utilizes two groups of secondary optics assemblies to carry out the purpose that short-range light diffusion function reaches LED bright spot homogenising; At first be above led light source, to install micro lens additional to control the angle that light gets into level crossing; Form the uniform source of light of collimation; Carrying out the secondary mixed light by diffusion barrier at last, this structure also needs the alignment optical axle center, and micro lens is complicated with aiming at the gap regulation and control of level crossing; In addition its maximum shortcoming is that the size that luminous point spreads just determines the size at level crossing; So the level crossing size of limitation can influence the light range of scatter, big more range of scatter then needs gap far away more, and such design can be restricted in adjustment.
The open case JP2005285697A of Jap.P. is a day inferior chemical LED lighting module, has the difference of a size order between led array and micro mirror array, and led array central authorities are in the focus of micromirror; Arrange outward more, LED and micromirror can form dislocation, and the light that diffuses out distributes; Just be concentrated within certain scope; Can in the scope of setting, reach mixed light and the function that increases brightness of illumination, but such design has the restriction of lighting area, must have the lamp source of similar big small size; Just have the relative scope that illuminates, the luminance brightness outside the scope can die-off.
The open case JP200249326A of Jap.P. is the matched combined of micromirror array and led array, and same shortcoming needs contraposition accurately, and a micromirror is handled a LED, and the light range of scatter is limited.
The open case WO2005041632A2 of world patent utilizes two groups of secondary optics assemblies to carry out the anaclasis and luminous point diffusion of secondary, and different with preceding case three is utilizes the mode of micromirror to reach secondary optics to spread, but not the level crossing of preceding case three.
Below all be that utilization needs the micromirror array of contraposition and the mode that led array is arranged in pairs or groups each other; With led light source homogenising, increase brightness and the zone of controlling illumination; Its practice is all very complicated, and design also is difficult to adjustment easily, is applicable to that various LED arranges; The micromirror yardstick also carries out the design of man-to-man geometrical optics with the LED pointolite, in the use of reality and do not meet the application of LED lighting.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of polygon curvature optical module, utilize the above concavo-convex micromirror of two kinds of curvature to arrange and the curvature adjustment; Increase the light transfer behavior of light in the diaphragm horizontal direction; So as to the LED luminous point with highlight strength, the effect of amplifying synchronously reduces light and concentrates; Avoid the high brightness dazzle of LED; When becoming area source by pointolite again, eliminate the brightness of blanking bar between multiple projection and increase led array in the lump, reach high transmission rate and the high effect that spreads.
To achieve these goals, the present invention provides a kind of optical module with changeful curvature, comprises a blooming piece and an array of source.Blooming piece comprises that a plurality of concavees lens and a plurality of convex lens are staggered and form along at least one direction each other; Said concavees lens have a concave lens width in the direction; Said concavees lens have the depth capacity vertical with this direction, and said convex lens have a convex lens width in the direction, and said convex lens have the maximum height vertical with this direction; Said depth capacity is greater than 1/2 of this concave lens width, and said maximum height is greater than 1/2 of this convex lens width.Array of source is arranged by a plurality of light emitting diodes and is formed, and wherein this concave lens width and this convex lens width are unequal.
In above-mentioned preferred embodiment; This depth capacity is greater than this concave lens width; This maximum height is greater than this convex lens width, and from this blooming piece of part light penetration of this array of source, the path lateral that part light transmits with total internal reflection is transmitted in this blooming piece; Wherein, the ratio of the spacing between the distance of array of source to blooming piece and a plurality of light emitting diode is 1.
In above-mentioned preferred embodiment, said concavees lens and said convex lens are staggered along a first direction and a second direction.
In above-mentioned preferred embodiment, this first direction is vertical with this second direction.
In above-mentioned preferred embodiment, this concave lens width and this convex lens width are cumulative in the direction or decrescence, and this depth capacity and this maximum height can be cumulative in the direction or decrescence.
The present invention with the light of a large amount of beam incident optical diaphragms, changes into the transmission on the plane with the micromirror array of the concavo-convex different curvature ratio of high-aspect-ratio; The transfer mode of light comprises diffusion, secondary reflection and the birefringence function except original micromirror like this, and the light that increases the diaphragm plane direction is delivered in derivation; Along with the adjustment in LED gap; Can be with the pointolite area, lasting multiplication becomes area source, can also keep the efficient and the brightness of microstructure bright dipping simultaneously.
Description of drawings
For letting above and other objects of the present invention, characteristic and the advantage can be more obviously understandable, the hereinafter spy enumerates preferred embodiment, and cooperates appended accompanying drawing, elaborates as follows:
Fig. 1 is the synoptic diagram of optical module of the present invention;
The light that Fig. 2 sends for LED gets into the synoptic diagram of blooming piece;
Fig. 3 representes the micromirror array that is shaped as closelypacked convex lens of blooming piece;
Fig. 4 representes that blooming piece is two semicircular concavees lens and the staggered shape of convex lens;
Fig. 5 is the cut-open view of an embodiment of blooming piece of the present invention;
Fig. 6 is the cut-open view of another embodiment of blooming piece of the present invention;
Fig. 7 is the synoptic diagram according to the transmission of Fig. 5,6 the light that blooming piece produced;
Fig. 8 is the stereographic map of blooming piece of the present invention;
Fig. 9 to Figure 11 is the Illumination Distribution curve map of three kinds of forms in the table 2;
Figure 12 is the proving installation figure that utilizes the high-capacity LED array module to test;
Figure 13 is the cast LED lighting module that utilizes the structure of high-capacity LED array to form;
Figure 14 A to 14C is CCD image and the Illumination Distribution figure of form III in the table 2;
The photo of Figure 14 D representes to utilize this blooming piece to eliminate the function of light line;
The comparison sheet that Figure 15 amplifies for luminous point.
[primary clustering symbol description]
7,10～blooming piece
12～convex lens
14～concavees lens
16～convex lens
20～substrate
5、30～LED
40～acrylic plate
Embodiment
The present invention is the micromirror array with the concavo-convex different curvature ratio of high-aspect-ratio, with the light of a large amount of beam incident optical diaphragms, changes into the transmission on the plane; The transfer mode of light comprises diffusion, secondary reflection and the birefringence function except original micromirror like this, and the light that increases the diaphragm plane direction is delivered in derivation; Along with the adjustment in LED gap; Can be with the pointolite area, lasting multiplication becomes area source, can also keep the efficient and the brightness of microstructure bright dipping simultaneously.
Fig. 1 is the synoptic diagram of optical module of the present invention, and it comprises blooming piece 10, substrate 20 and a plurality of LED30 that is located on the substrate 20, and said LED30 is arranged in a two-dimensional array.
Be that PC material with refractive index 1.59 is a blooming in the explanation of embodiment, but the material of blooming piece of the present invention is not limited to PC.
Before an explanation preferred embodiment of the present invention, earlier with the state of the blooming piece of description of drawings light through having concave-convex lens.
The light that Fig. 2 sends for LED 30 gets into the synoptic diagram of blooming piece.The light track analysis of three angles is carried out in the behavior that the light refraction that exhales via LED 30 gets into blooming piece 10; The LED lighting angle is 120 degree; Such light born of the same parents figure, relatively low in light intensity with great visual angle, the light quantity of representing each angle to be distributed with arrow length among Fig. 1; The angle of incidence of light degree is more approaching high more perpendicular to the blooming piece luminous flux, and is therefore the highest in the brightness in LED 5 dead aheads.
The micromirror array that is shaped as general tightly packed gapless convex lens 12 of blooming piece 10 shown in Figure 3, light gets into the semicircle micromirror array in the blooming piece 10 by the incident angle (shown in arrow a, b, c) of 30 degree, 60 degree and 90 degree.Can see, when light source vertically gets into, light bright dipping in the segment set of eyeglass top B; Light then is birefringence light echo source through the A part of micromirror, when light source incline 30 degree or 60 are spent; Light can be simultaneously in A, two regional bright dippings of B, and optical track mark behavior so only provides the part bright dipping of light, the behavior of birefringence; Near the vertical light inlet of wherein higher light quantity light meeting birefringence, the high angle incident light of less luminous flux then is can local bright dipping.
Fig. 4 representes that blooming piece 10 is two semicircular concavees lens 14 and convex lens 16 staggered shapes; Except the light bang path of original convex lens 16 micromirror as Fig. 3, also produce new optical path with convex lens 16 staggered concavees lens 14, the regional A that new path is joined by concave-convex lens can produce laterally; Just with the transmission (shown in arrow f) of blooming piece parallel direction; Such transmission can be passed through and have more long-range path domain, and the light of lateral transport also can reflect and bright dipping through concavees lens 14 or convex lens 16 in suitable angle; But the textural association of so equally big or small concavo-convex eyeglass is under the situation of vertical light inlet; Convex lens 16 all can produce the behavior of bright dipping with the top B of concavees lens 14, so have under the situation of identical width at concavees lens 14 and convex lens 16, infer that the amount of light of vertical direction is the twice of single concave mirror or convex mirror; Mean when high-throughout light gets into; The bright dipping of all can going ahead of the rest of most of light, less light can develop into the direction of lateral transport, can not effectively control the luminous point dispersal behavior of LED.
One embodiment of blooming piece of the present invention; As shown in Figure 5; When diminishing staggered concavees lens 14 width (width of width and convex lens 16 that is concavees lens 14 is unequal); Just can reduce light and vertically go into the amount of light of light time, and the light of incident concavees lens 14 is imported in the lateral transport in a large number, shown in the arrow g of Fig. 5 from concavees lens 14.
Fig. 6 is another embodiment of blooming piece of the present invention.Fig. 6 is for increasing the depth-to-width ratio (ratio of the height and the width of convex lens of convex lens and concavees lens; The ratio of the degree of depth of concavees lens and width) carries out the light trace of full blooming piece after; Can see the path (shown in arrow h) of total internal reflection that light the forms transmission of lateral transport; In this structure, the embodiment of light amount ratio Fig. 5 of lateral transport is more.
Fig. 7 is the synoptic diagram according to the transmission of Fig. 5,6 the light that blooming piece produced, get into blooming piece 10 of the present invention from the light of LED30 after, transmit in the direction that is parallel to blooming piece 10; And in the some bright dipping that has suitable distance with LED vertical incidence place, be under the situation of array at light source (LED 30), the light of each LED 30 incident can be in the plurality of positions bright dipping; So; Can be with the LED luminous point of highlight strength, the effect of amplifying synchronously reduces light and concentrates; Avoid the high brightness dazzle of LED; When becoming area source by pointolite again, eliminate the brightness of blanking bar between multiple projection and increase led array in the lump, reach high transmission rate and the high effect that spreads.Analysis via opticpath; Can know the trend direction that the structure kenel changes; Utilize the collocation of Laser Processing and light shield can produce the concavo-convex staggered micromirror array of high-aspect-ratio; As shown in Figure 8, a plurality of concavees lens 14 and a plurality of convex lens 16 are staggered along first direction L1 and second direction L2, in addition also can be two micromirror that depth-to-width ratio is lower of middle existence than the high-aspect-ratio micromirror.
Luminous point enlargement ratio and optical efficiency test
The comparison sheet that Figure 15 amplifies for luminous point, wherein WD is the form of led array, FD is a blooming piece of the present invention; GD is known blooming piece; Test via luminous point amplifies is compared, and enlargement ratio of the present invention can present 67～1012 times luminous point amplification effect with space between light sources, and the micromirror on general diffusion barrier surface can't be broken up luminous point; Though diffuser plate has preferable dispersal behavior, brightness but declines to a great extent.
Table 1 utilizes the measuring principle of power meter for the optical efficiency test result and carries out the efficient of all light penetrations; The result shows that the optical efficiency of blooming of the present invention is 89%; Near 90.7% of diffusion barrier, but, can know diffuser plate severe attrition light-source brightness by data far above 75.1% of diffuser plate; So blooming of the present invention also has all well and good performance at light extraction efficiency except luminous point being broken up.
Table 1
| Sample | Microwatt | Number percent |
| LED | 1523/1570(1546) | 100％ |
| LED+FD | 1374/1378 | 89.0 |
| LED+GD | 1405/1401 | 90.7 |
| LED+DP | 1162 | 75.1 |
Table 2 carries out the result of the Illumination Distribution test of blooming piece of the present invention for utilizing low-power led array module testing; Arrange space ratio (the space ratio that is calculated according to LED; LED is to the ratio of the distance and the spacing between the LED of blooming piece); Design three kinds of form I, II, III altogether; Figure 14 A to 14C is the CCD image and the Illumination Distribution figure of form III collocation different optical film in the table 2, is respectively not add blooming piece (Figure 14 A), adds known diffusion barrier (Figure 14 B) and the comparison that adds blooming piece of the present invention (Figure 14 C); Fig. 9 to Figure 11 is the Illumination Distribution curve map after three kinds of forms and the collocation of different optical diaphragm in the table 2; When LED arranges different, spacing not simultaneously, the space ratio that is produced has different brightness to be increased and changes, and wherein the center yield value of form III reaches 200% (with not adding the blooming piece person comparing); So utilize the blooming piece of the present invention can be, and promote the illumination of whole light fixture effectively with LED pointolite homogenising on short space length.
Table 2
| Form | Space ratio | The maximum luminance gain ratio of central authorities |
| I | 5 | 1.5 |
| II | 2.2 | 1.27 |
| III | 1 | 2 |
[0061] Figure 12 is the proving installation figure that utilizes the high-capacity LED array module to test, and wherein 40 is acrylic plate.The photo of Figure 14 D representes to utilize this blooming piece to eliminate the function of light line, when increasing illumination, and phenomenon (light line) that can the multiple projection of cancellation.
The cast LED lighting module that Figure 13 forms for the structure of the above high-capacity LED array of utilization.With blooming piece 10 bendings of the present invention, can 30 higher source luminances of the LED on the substrate 20 be produced the radiation effect of ring-type, form the system of fluorescent tube shape illumination.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Has common knowledge the knowledgeable in the technical field under any; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the scope that accompanying Claim defines.
Claims (10)
1. an optical module with changeful curvature is characterized in that, comprising:
One blooming piece; Comprise that a plurality of concavees lens and a plurality of convex lens are staggered and form along at least one direction each other, said concavees lens have a concave lens width in the direction, and said convex lens have a convex lens width in the direction; Said concavees lens have the depth capacity vertical with this direction; Said convex lens have the maximum height vertical with this direction, and this depth capacity is greater than 1/2 of this concave lens width, and this maximum height is greater than 1/2 of this convex lens width; And
One array of source; Form by a plurality of light emitting diodes arrangements; Wherein this concave lens width and this convex lens width are unequal, and from this blooming piece of part light penetration of this array of source, the path lateral that part light transmits with total internal reflection is transmitted in this blooming piece;
Wherein, the ratio of the spacing between the distance of array of source to blooming piece and a plurality of light emitting diode is 1.
2. optical module with changeful curvature according to claim 1 is characterized in that, said concavees lens and said convex lens are to be staggered along a～direction and a second direction.
3. optical module with changeful curvature according to claim 2 is characterized in that this first direction is vertical with this second direction.
4. optical module with changeful curvature according to claim 1 is characterized in that, this concave lens width and this convex lens width are cumulative in the direction.
5. optical module with changeful curvature according to claim 4; It is characterized in that; Said concavees lens have the depth capacity vertical with this direction, and said convex lens have the maximum height vertical with this direction, and this depth capacity and this maximum height are cumulative in the direction.
6. optical module with changeful curvature according to claim 4; It is characterized in that; Said concavees lens have the depth capacity vertical with this direction, and said convex lens have the maximum height vertical with this direction, and this depth capacity and this maximum height are in the direction decrescence.
7. optical module with changeful curvature according to claim 1 is characterized in that, this concave lens width and this convex lens width are in the direction decrescence.
8. optical module with changeful curvature according to claim 7 is characterized in that, this depth capacity and this maximum height are in the direction decrescence.
9. optical module with changeful curvature according to claim 7 is characterized in that, this depth capacity and this maximum height are cumulative in the direction.
10. optical module with changeful curvature according to claim 1 is characterized in that this blooming piece is bending.
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| CN2008102114251A CN101684916B (en) | 2008-09-22 | 2008-09-22 | Optical module with changeful curvature |
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| CN101684916B true CN101684916B (en) | 2012-05-30 |
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| US5933276A (en) * | 1994-04-13 | 1999-08-03 | Board Of Trustees, University Of Arkansas, N.A. | Aberration-free directional image window sheet |
| US5995288A (en) * | 1997-04-22 | 1999-11-30 | Dai Nippon Printing Co., Ltd. | Optical sheet optical sheet lamination light source device, and light-transmissive type display apparatus |
| CN101153924A (en) * | 2006-09-28 | 2008-04-02 | 财团法人工业技术研究院 | Optical scattering module and method for forming optical scattering structure |
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2008
- 2008-09-22 CN CN2008102114251A patent/CN101684916B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933276A (en) * | 1994-04-13 | 1999-08-03 | Board Of Trustees, University Of Arkansas, N.A. | Aberration-free directional image window sheet |
| US5995288A (en) * | 1997-04-22 | 1999-11-30 | Dai Nippon Printing Co., Ltd. | Optical sheet optical sheet lamination light source device, and light-transmissive type display apparatus |
| CN101153924A (en) * | 2006-09-28 | 2008-04-02 | 财团法人工业技术研究院 | Optical scattering module and method for forming optical scattering structure |
Non-Patent Citations (1)
| Title |
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| JP特开2006-3522A 2006.01.05 |
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