TW200422560A - High efficient light collecting module - Google Patents

Abstract

This invention provides a high efficient light collecting module, includes a light-focusing light source, a reflective shield, a reflective mirror located between the focus of the reflective shield and the light-focusing light source. The light-collecting light source is able to focus the light source to the focus of the reflective shield. The reflective shield serves to incident the light incident towards and reflected by the reflective mirror towards the reflective shield in a symmetrical manner. The ultimate light is reflected by the reflective shield. The reflective light beam is a symmetrical light beam. This method effectively reduces the area of the reflective shield. The light beam reflected by the reflective shield results in an area and radiating angle that are smaller than those of the conventional light-focusing light source, so as to obtain a high efficient light collecting module.

Description

200422560 V. Description of the invention (l) --- k [Technical field to which the invention belongs] The present invention is a light-collecting module, which can improve the light-collecting efficiency of a light source by using this technology. [Previous technology] Generally, projection display system devices need to use a light collection module to perform light splitting, modulation, light combining and imaging. However, the light use efficiency is directly related to the performance of brightness, uniformity, and color of the overall development quality. Not only that, as the price of projection displays declines, the size of image modulation panels (such as DMD panels, etc.) used by projection displays is getting smaller and smaller to save costs, and the number of pixels per unit area is getting more and more It often reduces the transmittance of the panel. Not only that, the light utilization efficiency will decrease as the area of the panel decreases. Therefore, all Wei's families are all concentrating on how to improve the utilization efficiency of light sources. Generally, the efficiency of the light beam obtained by the light source passing through the reflector can be judged by the parameter Etendue. The definition and equation of Etendue are as follows: E = 5 5 cos 0 dAd Ω, and the relationship between 0, dA, and d Ω can be seen in the first figure. Here dA represents the area projected by the beam, represents the solid angle of the beam passing through dA, and 0 represents the angle between the normal vector of the plane dA and the central axis of d Ω. This equation represents the geometric property of the beam, and the properties of the energy density, intensity, and brightness of the beam are not shown in this equation. Under the same lumen beam, when

200422560 V. Description of Invention (2)

The smaller the Etendue, the smaller the integrated value of the area of the beam, the angle between the beam and the plane normal, and the solid angle of the beam; that is, the higher the light utilization efficiency. From the above concepts, the optical design engineer can easily determine the quality of the light utilization efficiency of the light source module. The light-collecting modules generally used in projection displays can be roughly divided into ellipsoidal light bulbs (figure 1) and parabolic light bulbs (figure 3). In the second figure, the light source 131a is placed on the first focus F1111a of the ellipsoidal reflector 111 & the light emitted by the light source 1 3 1a is focused on the second focus F1 through the ellipsoidal reflector 11a On 112a, the light enters the columnar integrator 21a to be homogenized, and then performs beam splitting, light combining, and imaging. Referring to the third figure, the light source 131a is placed on the focal point F 1 2 11 a of the parabolic reflector i2la. The light emitted by the light source is reflected by the parabolic reflector 1 2 1 a, and the light is reflected parallel to each other. The cover, through the positive lens 4a placed in front of the reflecting cover, collects light on the columnar integrator 2 & and performs a homogenization process. First, due to the combination of the reflector and the light source, there are other factors to consider, such as the heat dissipation of the light source, the coating of the reflector, the problem of the mold opening of the reflector, and the adjustment between the light source and the reflector. In all cases, the volume of the reflector cannot be reduced (that is, the projection area of the light beam through the reflector cannot be reduced), and due to the characteristics of the UHP (ultra-high pressure met ^ ufy lamp) light source, the area of the focusing point and Beam group = cannot be reduced. Therefore, when a general projection lamp is used in a small-sized 'v image, it is often difficult to obtain the ideal optical effect

200422560 V. Description of Invention (3) Rate. Therefore, manufacturers have no intention to change the above three factors (0, A, Ω) to improve optical efficiency. Refer to the fourth picture, this light collecting module is the masterpiece of Philips in this respect. This is the use of the characteristics of the quartz bulb (bulb ': bUrner) l32a on the lamp tube 13a. The outer surface of the bulb is a spherical surface. , And then fold back to the original path, so that the luminous angle of the light source 13la becomes half of the original, and achieves the role of small etendue to improve optical efficiency. The light source 131a is coated on the center position of the hollow quartz sphere U2a (bulb uf the bUrner), and the light source 131 & is also located at the first focus point F111 a of the ellipsoidal reflector 111 a. On the outer surface of the right half of the quartz sphere, a B reflective coating layer 13218 is plated, so that the portion emitted by the light source Ula to the right is reflected back to the quartz sphere 132a through the reflective coating layer 1321a. Center position. Since the light source 131a is placed at the first focus of the ellipsoidal reflector 111 & At 1113, the light reflected from the right half passes through the first focus FUla again, and then exits to the left. After the light on the left side is reflected by the ellipsoidal reflector 丨 丨 丨 a, the light beam is converged at the second focus FU12a of the ellipsoidal reflector 丨 丨 ^. Because the light from the final light source 1 3 1 a only exits to the left and is focused by the ellipsoidal reflector 1 Π a, compared with the ellipsoidal reflector of the second figure, the ellipsoidal reflector of the fourth figure requires Much smaller. That is, the reflector at the right half of the first focus F 11 la of the ellipsoidal reflector is not used.

~ -I a Page 6 200422560 V. Description of the invention (4) 4 to, so you can cancel the paper published by D APhilips in 2002 SID (Holger Moench, Arnd Ritz, Higher Output, More Compact UHP Lamp Systems, SID 02) Under the condition of small Etendue (5 ~ 15πππΓ2 ster), the light collection efficiency can be improved by 20 ~ 30%.

The Phi 1 ips light source module has several problems: (1) The spherical surface of the quartz round sphere 132a is permanently deformed: Due to the heat and high pressure generated by the UHP lamp during use, the quartz round sphere will be deformed, so it reflects back The light will not return to the center position of the sphere along the original path, so the optical efficiency will decrease with time. (2) Shortened lamp life: Some of the light reflected by the reflective coating 1 3 2 a of the quartz sphere 1 3 21 a will be blocked by the electrode 1322a, resulting in reduced optical efficiency and heating the electrode, resulting in shortened lamp life. (3) Spherical surface is not easy to produce: When manufacturing the quartz spherical body 132a, the spherical surface of the 'quartz spherical body is not easy to produce, resulting in that the reflected light will not return to the center of the sphere along the original path, so the optical efficiency is reduced. (4) It is not easy to obtain the supply source. This special light source module can only be produced by p h i η p s. See Figure 5. This light source module is a U.S. patent (us 635670 0 B1) consisting of a piece of ellipsoidal reflector 31a and a piece of spherical reflector 32a 'where the light source 131a is placed on the first focus F311a of the ellipsoidal reflector 31a The spherical center C321 of the spherical reflector and the first focal point F 3 11 a of the ellipsoidal reflector are in common with the light source 1 3 1 a. The symmetry axis A133 of the lamp tube 1 3 a is perpendicular to the optical axis (the line connecting the first focal point F 3 11 a and the second focal point F 3 1 2 a of the optical axis system ellipsoidal reflector 3 la). After the light from the right half of the light source is emitted, it is reflected by the spherical reflector 32a and then passes along the original path.

200422560 V. Description of the invention (5) The first focus F 3 11 a on the ellipsoidal reflector 3 1 a is reflected by the ellipsoidal reflector 3 1 a, and the light on the left side of the light source 1 3 1 a passes through the ellipse. Spherical reflector 31a—After co-reflection, they collectively converge on the second focus F312a of the ellipsoid reflector 31 & In addition to improving the optical utilization efficiency, this part also has other disadvantages: (1) the assembly is not easy (2) the light reflected back by the spherical reflector is partially blocked by the electrode, resulting in a decrease in light utilization efficiency. (3) The “light blocked by the electrode” will heat the electrode and make it difficult to cool the electrode. (4) The component cost is too high, and all are not standard products. (5) The volume is too large. See Figure 6. This light source module is composed of a spherical reflector 3 2 a, two parabolic reflectors 331 a and 332 a, and a lamp tube I 3 a. The spherical center C321 of the spherical reflection unit 32a is concentric with the focal point F33 11a and the light source 131a of the first parabolic reflection unit Mia. The light from the lower half of the light source is reflected by the spherical reflector 3 2 a, returns to the center of the sphere along the original path, and is emitted toward the first parabolic reflector Mla. The light is reflected by the first parabolic reflector 331a into parallel light, and the parallel light is reflected by the second paraboloid reflector 332a. Finally, the light is collected at the focal point F3321a of the second paraboloid reflector 3 3 2a. The advantages and disadvantages of the sixth diagram are the same as those of the fifth diagram. [Summary of the Invention] The object of the present invention is to provide a light collection module, which can effectively reduce Etendue to improve the light utilization efficiency. Therefore, the light-concentrating module includes a light-condensing type light source system, which is a kind of common light source

74H Page 8 200422560 V. Description of the invention (6) Focus on a certain point; a reflector, when the light converges on its focus and is reflected by the reflector, the light can be emitted in parallel or converged on its second focus again Or shoot in the direction of the intended purpose. & In the light path between the light source system of the condensing type and the focal point of the reflector, an inclined flat mirror can be installed. Through the function of this inclined flat mirror, the condensing type The turning position of the focal point of the light source system is to make the light focus on the focus of the reflector; if the reflector is an ellipsoidal reflector, the light is focused on the second focus of the reflector. [Embodiment] Refer to the seventh figure. The condensing light source system is composed of the following components: an ellipsoidal bulb 11, 45 located in front of the ellipsoidal bulb U. The inclined plate 4, the ellipsoidal reflector 31 on the left side of the inclined plate 4, and the cylindrical integrator 21 at the second focal point F3 12 of the ellipsoidal reflector. At 45. The inclined plate 4 is based on an ellipsoidal bulb, and the light incident surface has a reflective coating layer, / 41. This reflecting surface 41 can reflect all the spectral bands of visible light; here-45. Around the intersection of the inclined mirror surface 4 and the optical axis Ain3 of the ellipsoidal bulb 丨 丨, will be 45. The inclined reflecting surface 4 is drilled with a small circular hole 42. The size of the small circular hole is not larger than the light collecting invalid area of the ellipsoidal bulb. The range of the ellipsoidal bulb 11's light-collection ineffective area is from the ellipsoidal bulb 丨 丨 the virtual focus F1113 (the second focus of the original ellipsoidal bulb 丨 丨), extending to 6 / from B along the ellipsoid The inner edge of the spherical reflector U1 goes to c, and then from 0 to eight. Therefore, a small circular hole 42 in the light-collecting ineffective area of the ellipsoidal light bulb 45 with a 45-inclined reflective mirror surface 4 has little effect on the overall light-collecting effect. 200422560 V. Description of the invention (7) * Therefore, the light emitted by the light source 1 2 1 is reflected by the ellipsoidal reflector 111, which should have focused directly on the second focus FI 113 of the ellipsoidal bulb, but Because first encountered 45. The reflecting plated surface 41 of the flat mirror is focused on the first focus F311 of the ellipsoidal reflector 31. Since the second focus F 111 2 of the ellipsoidal bulb 11 and the second focus F311 of the ellipsoidal reflector 3 1 coincide with each other after being reflected by the 45 ° plane mirror 4, the light from the ellipsoidal bulb 11 is concentrated on the ellipsoidal surface. After the first focal point F 3 11 of the reflective reflector is projected toward the ellipsoidal reflector 3 1. Through the reflection of the ellipsoidal reflector, the light passes through at 45. The small circular holes 42 of the plane reflecting mirror surface 4 are converged on the second focal point f 3 1 2 of the ellipsoidal reflecting cover 3 1. After that, the light is homogenized by the column integrator 21 again. The advantages of this picture are as follows: (1) From the simple ray tracing results of the seventh picture, it can be seen that the solid angle of the ellipsoidal reflector 31 is higher than that of the ellipsoidal bulb 11! ? 丨 丨 丨 2 The solid angle is much smaller; (2) Effectively reduce the area of light distribution; (3) The beam has good symmetry in the up, down, left, and right of the light module, and it is easy to reach the brightness on the screen (4) The three main parts in the picture-ellipsoidal bulb, flat reflector, and ellipsoidal reflector are easy to obtain and not easily controlled by a few suppliers; (5) Easy assembly. The eighth figure. The eighth figure is different from the seventh figure in that there is no oblique plane, but the axis of symmetry of the parabolic reflector 33, the axis 31 of the horizontal plane mirror 5 from the parabolic reflector 33. The base point 332 is produced by 舳 ㈣ ”Bu. / And its coating reflection surface 51 / mouth-shade glaze line A 3 d 1, this level is flat and radiated on the 卞 ten-sided reflection is known as a rectangular mirror,

742 Page 10 200422560 V. Description of the invention (8) The symmetry axis is located on the axis A33 1 and the straight side of the plane mirror is tangent to the focal point F3311 of the parabolic reflector 33. Because the focal point of the ellipsoidal plastic bulb 11 is not a point defined mathematically, it has no volume and size. Instead, it focuses on a small area (here called the light-concentrating area) i 3. 11 is a symmetrical illumination light source, so the light spots in the light-concentrating area are also symmetrical. Therefore, the straight edges that the tangent of the horizontal plane mirror 5 and the focal point F 3 3 11 of the parabolic reflector can divide the light spot of the light-concentrating area into the left and right halves 131 and 132 equally. The left half 131 is reflected by the horizontal plane mirror 'and the right half 1 3 2 goes straight. Therefore, the light beam originally incident on the parabolic reflection ^ 33 obliquely is converted into two symmetrical light beams to the parabolic reflection cover 33 through the equal division of the horizontal plane mirror 5. Therefore, the light can be reflected symmetrically from the paraboloid The hood 33 shoots. Since the incident light beam is divided into two parts, left 131 and right 132, by the horizontal plane mirror 5, it can also be regarded as two focus points F334 and? 333, = Don't use the lower half parabolic reflector 334 ... Parabolic inversion: single,-隹,, eight-point magic, two above, τ two semi-parabolic reflectors can be optimized for this focus design. ν '+ u The above is only a good example of the present invention. Each of L and 实施 determines the scope of implementation of the present invention, that is, a large A based on the application of the present invention. Effect changes and modifications should still fall within the scope of the patent of the present invention. 200422560 Schematic description of one " ^-Other features and advantages of this description, will be clearly understood in the following detailed description with reference to the preferred implementation of the schematic, in the diagram: The first diagram is An illustration of entendue. The second figure is a conventional ellipsoidal reflector light collection system. The light reflects and converges at the first focal point of the ellipsoid through the ellipsoidal reflection surface, and then the light enters the cylindrical integrator for uniform light Role. The third figure is a light source collecting system of a conventional parabolic lamp. The light f is emitted in parallel by the parabolic lamp, and the light is focused on the orthorhombic bismuth point through a positive lens. Then it enters the cylindrical integrator for light homogenization. The fourth picture shows a small etendue light collection module. The surface of the right half of the bulb of the burner on the tube is plated with a layer of reflective layer (which can reflect visible light), which can return the light from the right half of the light source along the original path; and the left half is An ellipsoidal reflecting surface. The light comes from the light from the left part towards the ellipsoidal reflector, and is reflected and converged at the focal point of the ellipsoidal reflecting surface. This light collecting module can improve the optical efficiency by 20 ~ 30%. The fifth picture shows a small etendue light collection module. The left side of the tube is an ellipsoidal reflector, and the right side of the tube is a spherical reflector. The first focus of the ellipsoid, the center of the sphere, and the location of the light source all have the same point. Therefore, the light from the right half of the light source is reflected by the spherical reflector through the circle along the original path to the ellipsoidal reflector. The light from the left half is collected at the second focal point of the ellipsoidal reflector through the ellipsoidal reflector. The sixth picture shows a small etendue light collection module. The light collecting module consists of a tube, and a spherical reflector and a tube above the tube.

200422560 Schematic illustration of a double parabolic reflector. The light source, the spherical center of the spherical reflector, and the focal point of the first parabolic reflector have three points in common. The light from the lower half of the light source is reflected by the spherical reflector and passes through the light source along the original path and then hits the first parabolic mirror. The light from the upper half of the light source and the light reflected from the lower half are directed to the first parabolic reflector to form parallel light, and the parallel light is then directed to the second parabolic reflector to reflect the grass' light and converge at the focus of the second parabolic reflector A cylindrical integrator will homogenize the light and reuse it. 'The seventh figure is a top view of the first preferred embodiment of the light collection system of the present invention. This collection light module is composed of the following three items: an ellipsoidal lamp and a 4 5. An ellipsoidal reflector with a slanted and hollowed out central small area. Since 45. For the reflection of the inclined mirror surface, the second focus position of the ellipsoidal lamp and the first focus position of the ellipsoidal reflector are in common. The light from the ellipsoidal lamp is reflected by an ellipsoidal reflector and passes through 45. The partially hollowed-out central area converges at the second focal point of the ellipsoidal reflector. The eighth figure is a top view of a second preferred embodiment of the light collecting system of the present invention. The ball light is focused directly on the focal point of the parabolic reflection f without any inclined mirror surface, and the light is parallelized away from the reflection cover through the reflection of the parabolic reflection cover. The second focus of the ellipsoidal light coincides with the $ point of the parabolic reflector. However, a horizontal reflector is used in the parabolic reflector, and the light beam emitted from the ellipsoid lamp is divided into two, so that the upward and downward symmetrical traveling light is emitted from the reflector. "" [Illustration of the drawing number] [Learning] 1 a bulb

200422560 Schematic Lesson 11 a Ellipsoidal bulb 111 a Ellipsoidal reflector Fill la First focus FI 112a Second focus 1 1 1 2 a Symmetry axis of an ellipsoidal reflector 1 2 a Parabolic bulb 1 2 1 a parabolic reflector F 1 2 11 a focus 1 3 a tube 1 3 1 a light source 132a quartz round sphere 1321a reflective coating 1 3 2 2 a electrode A1 3 3 axis of the tube 2 a integrator 2 1 a Column integrator 22a Matrix lens integrator 3 a Reflector 31a Ellipsoidal reflector 311a Semi-ellipsoidal reflector F 3 11 a Ellipsoidal reflector first focus F 3 1 2 a Ellipsoidal reflector 2nd focus 32a Spherical Reflector C 3 2 1 Spherical Reflector Center

Page 14 200422560

3 3 a parabolic reflector 331a first parabolic reflector F 3 3 11 a first parabolic reflector 332a second parabolic reflector F 3 3 2 1 a second parabolic reflector 333a semi-parabolic Reflector 4 a positive lens F 41 a positive lens focus [invention] 1 bulb 11 ellipsoidal bulb 111 ellipsoidal reflector F 1111 first focus F 111 2 second focus F 111 3 virtual focus A111 3 ellipsoidal Axis of symmetry of the reflector 12 Light tube 1 2 1 Light source 1 2 2 Quartz sphere 1 3 Concentration area (point) 1 3 1 Focus point left half 132 Focus point right half 2 Integrator 2 1 Column integrator

200422560 Brief description of the drawing 3 reflector 3 1 ellipsoidal reflector F311 ellipsoidal reflector first focus F312 ellipsoidal reflector 2nd focus 33 parabolic reflector F3311 parabolic reflector focus A331 symmetry axis 3 3 2 Base point 333 Upper half parabolic reflector F333 Focus point of upper half paraboloid reflector 334 Lower half paraboloid reflector F334 Focus of lower half paraboloid reflector 4 4 5 ° Plane mirror 41 Plane mirror Mineral film surface 42 Plane reflection Mirror round hole 5 horizontal reflecting mirror surface 5 1 mineral film reflecting surface

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Claims (1)

200422560 1. A high-efficiency light source light-gathering module, comprising:-a light source system or system that gathers at least one light source; the light beam is a cone-point non-light source; The reverse surface is a curved surface, which indirectly reflects light from the light source. It has-focus to V. The position of the focus is the same as the position of the condensing focus. The high-efficiency light source light collecting module according to the item, the size range of the reflecting cover is as follows: a base point is located on the reflective curved surface or the extended surface of the reflective curved surface, the distance from the focal point is the closest, and the tangent and the base point of the base point The angle between the line connecting to the focal point is a right angle; the size of the reflecting cover passes through the section of the reflecting cover connecting the base point and the focal point, with the focal point as the origin, and the point closest to the focal point on the section as the starting point. The point with the furthest distance from the focal point on this section is the end point, and the fan-shaped arc angle enclosed by it does not exceed the range of 180 °. 3. The high-efficiency light source light collecting module according to item 1 of the scope of the patent application, wherein the reflecting cover may be an ellipsoidal reflecting cover, or a parabolic reflecting cover, or a free-form surface. 1. The high-efficiency light source light-gathering module as described in item 1 of the scope of patent application, wherein the light-concentrating type light source system may be an ellipsoidal bulb. 5. The high-efficiency light source light-gathering module as described in item 1 of the scope of patent application, wherein the light-concentrating light source system can be composed of a parabolic bulb and a positive lens. A high-efficiency light source light collecting module, including: Page 17 200422560 t. The patented red-enclosed light-concentrating light source system has at least one light source, at least one structure, and a common focus point. This focus point is not where the light source itself is located. Cone-shaped body; a reflecting cover, the reflecting surface is curved, indirectly reflects the light from the luminous source, at least one focus, the position of this focus is the same as the position of the focal point of the condensing type light source system, reflecting the light from the focus ; A base point, which is located on the reflective surface or the extended surface of the reflective surface, is closest to the focal point, and the angle lost by the tangent of the point and the connection point to the focal point produces a right angle; and 'a plane reflection Mirror, the focal point of the condensing light source system is folded toward the reflector and the light beam from the reflector passes through the reflector. 7. The high-efficiency light source light-gathering module described in item 6 of the declared patent scope, the plane reflecting mirror has a light-transmitting area that does not affect the overall brightness excessively, and the light beam of the reflecting cover can pass through. t. The high-efficiency light source light-gathering module as described in item 6 of the scope of the patent application, the plane reflector and the line connecting the base point and the focal point form a 45 angle. The small light-transmitting area is located around the intersection of the connection line and the plane mirror. According to the high-efficiency light source light-collecting module described in Item 6 of the scope of the application for printing, if the reflector is an ellipsoidal reflector, its second focus passes through the light-transmitting area. 10. A high-efficiency light source light collecting module, comprising: a light source system of concentrating type, at least one light source, at least one light concentrating mechanism, and t-focus, and the focus point is not the position of the light source itself The collected light beam is a cone-shaped body; the reflecting cover has a curved surface and reflects the light from the light source indirectly. 200422560 6. The line of the patent application, at least one focus point is located at the nearest point of the reflection curve, and the right angle; Focus, this focus is the same, the tangent to the reflection surface or the reflection curve point and the position and the focusing autofocus There is a base point of the continuous light source system of the point i focus on the extension surface of the light beam surface, and the angle between the distance from the focus green is a flat mirror, which is located in the reflection cover. The focal point is tangent and the reflector receives the spotlight from that focal point. … 11. The high-efficiency light source light-gathering module set described in item 10 of the scope of the patent application ′ The plane surface of the mirror surface of the mirror is connected to the focal point. 1 2. According to the high-efficiency light source light collecting module described in Item 10 of the scope of the patent application, one edge of the flat mirror divides the focal point into two parts, and the light beams overlapping with the flat mirror are reflected, but not coincided. The beam continues straight. 1 3. According to the high-efficiency lamp source light-gathering module described in item 10 of the scope of the patent application, if the light beam collected by the light-concentrating lamp system is a symmetrical cone, there is a symmetry axis; The position of the plane mirror is on the plane formed by the normal vector of the plane mirror and the axis of symmetry, and the ^ line of the reflection surface at the base point is the normal vector of the plane mirror. 14. A high-efficiency light source light-gathering module, which includes a light-concentrating light source system, at least one light source, at least one light-concentrating mechanism, and a common focus point. This focus point is not the light source itself. Position, the collected light beam is a cone-shaped body; a reflector, the reflecting surface is curved, and indirect reflection of light from the light source can be divided into a first reflector and a second reflector, each with its base point, each Have its focus'These four points are on the same plane; the first reflector and the second reflector 200422560 6. The scope of the patent application is bonded to each other; the function of the first reflection sheet is the same as that of the first reflection cover; a flat mirror is located in the reflection cover, and an edge is located in the middle of the focus of the first reflection cover and the second reflection cover . 15. As in the high-efficiency light source light-gathering module described in item 12 of the scope of patent application, the focal point is not a mathematically defined point with no volume or size, but is a small-area light-gathering point located at On the edge of the flat mirror, the area of the light collecting point covers the focal points of the first and second reflectors at the same time. Therefore, part of the beam is reflected and partly penetrates. 16. The high-efficiency lamp source as described in item 12 of the scope of the patent application > group, the curved surface design of the first reflecting cover and the second reflecting green can be used for the area of the ^ mode I light μ area. Optimized design. "of