TWI222505B - High efficient light collecting module for light source - Google Patents

Abstract

This invention provides a high efficient light collecting module, including 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

^ 22505 ΐΓί · | · 「Π_ _ I Ι_, 1 ′ ~ 1 > _. Wfc commits 5. · 20 revised year 4 Ⅴ. Description of the invention (1) The technical field to which the invention belongs] The present invention is a collection Optical module, using this technology can improve the light collection efficiency of the condensing light source. [Previous technology] ^ General projection display system devices all need to use the light collecting module to perform light splitting, modulation, light combining and imaging. However, The efficiency of light utilization is directly related to the performance of the brightness, uniformity, and color of the overall imaging quality. Not only that, as the price of projection displays declines, image modulation panels (such as DMD panels, etc.) used by projection displays ) 'S size is getting more and more ^' to save costs; and more and more pixels on a unit area reduce the transparency of the panel, not only that, the light utilization efficiency will decrease as the panel area shrinks. Therefore, various manufacturers are all dedicated to studying how to improve the utilization efficiency of the light source. Generally, to judge the efficiency of the light beam obtained by the light source through the reflector, it can be expressed by the parameter Etendue. And the equation is as follows: E = ^ 5 cos ΘdAd Ω and the relationship between 0, dA, d Ω can be seen in the first figure. Here dA represents the area projected by the light beam, which represents the solid angle of the light beam passing through ^, and 0 represents a plane The angle between the normal vector and the central axis of άΩ. This equation represents the geometric proper ^ of the beam, and the properties of the beam such as energy density, intensity, and brightness are not shown in one equation. . Under the same lumen beam, when

1222505

V. Description of the invention (2)

The smaller the Et endue, the smaller the integrated value of the area of the beam, the angle between the beam and the plane normal, and the angle of the beam body angle; that is, the efficiency of light utilization is also reflected in the above concept, optical design Engineers can easily determine the light utilization efficiency of the light source module. The light collecting module generally used in projection displays can be roughly divided into ellipsoidal bulbs (see the second figure) and parabolic bulbs (see the third figure). In the figure, the light source 131a is placed in the ellipsoidal reflector 1113. At the first focal point F 1111 a, the light emitted by the light source 丨 31 a is focused on the second focal point F1 丨 12a through the ellipsoidal reflector 11 la, and the light enters the cylindrical integrator 21 a to be homogenized. , And then perform spectroscopic, combined light, imaging and so on. Referring to the third figure, the light source 131a is placed on the focal point F1 2 11 a of the parabolic reflector 121 & 'the light emitted by the light source is reflected by the paraboloid reflector 1 2 1 a' and the light is emitted parallel to each other The cover, through the positive lens 4a placed in front of the reflection cover, collects light on the columnar integrator 2la for uniform processing. 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 beam through the reflector cannot be reduced), and due to the characteristics of the UHP (ultra-high pressure mercury lamp) light source, the area of the focusing point and the beam The solid angle cannot be reduced. Therefore, when a general projection lamp is used under a small-sized image modulation panel, it is often difficult to obtain an ideal optical effect.

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V. Description of the invention (3) Rate. Therefore, manufacturers have no intention to change the above three factors (0, A, Ω) to improve optical efficiency. ^ See the fourth picture, this light module is the masterpiece of Phi lips in this respect. This is to take advantage of the characteristic of the outer surface of the quartz bulb sphere 132a on the lamp tube 13a as a spherical surface. A reflective layer 1321a is plated so that the spherical body can be used as a spherical mirror, and the light source 131 & The light emitted by the Korea is turned back to the original path, so that the light emitting angle I of the light source 131 & is half of the original, and achieves the effect of small etendue to improve the optical efficiency. The light source 131a is covered with a hollow quartz sphere 132a (bulb of the burner), and the light source 131 & is also located at the first focal point F 丨 丨 丨 a of the ellipsoidal reflector 111a. On the outer surface of the right half of the quartz sphere, a B-layer reflection The coating layer 13213 enables the part of the light emitted by the light source 131a to be emitted to the right side, and then reflects back to the center position of the quartz sphere 132a through the reflective coating layer 1321a. Because the light source 131a is placed in the ellipsoidal reflector 1118, The first focus is at 111 &, so the light reflected from the right half passes through the first focus F 丨 丨 丨 & and then exits to the left. The light on the left passes through the ellipsoidal reflector After the reflection of a, the light beam is converged at the second focus F1112a of the ellipsoidal reflector 111 & Since the light from the final light source 1 31 a only exits to the left and is focused by the ellipsoidal reflector 111a, The ellipsoidal reflector in the second figure is significantly smaller than the ellipsoidal reflector in the fourth figure. That is, the first focus of the ellipsoidal reflector? 1113 The reflector on the right half is not used.

1222505% 5 · 2 〇 Revised Year and Month Θ 4 乂 — Contribution. V. Description of the Invention (4) has arrived, so it can be cancelled. According to a paper published by Philips in the 20 2 SID (Holger Moench, Arnd Ritz, Higher Output, More Compact UHP Lamp Systems, SID 02), it can be seen that under the condition of small Etendue (5 ~ 15mnT2 ster), the light collection efficiency can be improved 20-30%.

The Phi 1 ips light source module has several problems: (1) The spherical surface of the quartz sphere 132a is permanently deformed: Because the south heat and pressure generated by the UHP lamp during use will cause the quartz sphere to deform and reflect, The returned 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: Part of the light reflected by the reflective coating 1321a of the quartz sphere 132a will be blocked by the electrode 1 32 2a, 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 source of supply: This special light source module is only produced by Phi 1 ips. See Figure 5. This light source module is a U.S. patent (US 63567〇B1) consisting of an ellipsoidal reflector 3ia and a spherical reflector 328 'where the light source 131a is placed at the first focus F311a of the ellipsoidal reflector 3ia On the other hand, the spherical center C321 of the spherical reflector 32a and the first focal point F31a of the ellipsoidal reflector are in common with the light source 131a. The symmetry axis A133 of the lamp tube 13a is perpendicular to the optical axis (the line connecting the first focus F 3 11 a and the second focus f 31 2 a of the ellipsoidal reflector gia of the optical axis system). 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.

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The first focal point F31 la is on the ellipsoidal reflector 31 &, after being reflected by the ellipsoidal reflector 3 1 a, the light on the left side of the light source 1 3 1 a passes through the ellipsoidal reflector 31a-after the same reflection, they converge together. At the point F3 12a of the ellipsoidal reflector 3ia. 1. In addition to improving the efficiency of optical use, this piece has other disadvantages: (1) it is not easy to assemble (2) the light reflected back by the spherical reflector, and some injuries will be covered by the electrode, which will reduce the light use efficiency. (3) The light blocked by the electrode will heat the electrode, making the electrode cold & difficult. (4) The component cost is too high, and all are not standard products. (V) Volume is too large 0 Refer to the sixth figure. This light source module is composed of a spherical reflecting cover Ma, two parabolic reflecting covers 331a, 332a, and a lamp tube i3a. The spherical center C321 of the spherical reflector 32a is concentric with the focal point F331a of the first parabolic reflector 331a and the light source 131a. The light from the lower half of the light source is reflected by the spherical reflector 32a, returns to the center of the sphere along the original path, and is emitted toward the first parabolic reflector 331a. The light is reflected by the first parabolic reflector 331 & 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 32a. 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 collecting module, which can effectively reduce Etendue to improve light utilization efficiency. Therefore, the light-collecting module includes a t-light type light source system, which is a type of light source

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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 refocused on its second focus or in a predetermined direction. An inclined plane reflector can be installed in the path of light between the spotlight-type light source system and the focal point of the reflector, and the effect of the spotlight-type light source system can be achieved by the function of the inclined plane reflector. The focus position is turned so that the light is focused 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, and 4 5 in front of the ellipsoidal bulb. The inclined plate 4, the ellipsoidal reflector 3 丨 located on the left side of the inclined plate 4, and the cylindrical integrator 21 at the second focus point F312 of the ellipsoidal reflector. At 45. The inclined plate 4 has a reflective coating layer 41 on the light incident surface of the ellipsoidal bulb 11, and the 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 person 1113 of the ellipsoidal bulb 1, the 45 ° inclined reflection mirror 4 is drilled into a small circular hole 42. The size of the small circular hole is not larger than the ellipsoidal bulb.丨 The light collection invalid area. The range of the light collection ineffective area of the ellipsoidal bulb 11 is from the virtual focus F111 3 of the ellipsoidal bulb 丨 丨 (the second focus of the original ellipsoidal bulb 11) to a, extending from β along the ellipsoidal surface. The inner edge of the reflector 111 goes to C, and then from c to A. Therefore, a small circular hole 42 is drilled in the light-collecting ineffective area of the ellipsoidal light bulb 丨 45 ° inclined reflecting mirror surface 4 and has little effect on the overall light-collecting effect.

Page 9 1222505 V. Description of the invention (7)

Therefore, the light emitted by the light source 1 21 is reflected by the ellipsoidal reflector 111 first, which should have been directly focused on the second focus F 111 3 of the ellipsoidal bulb, but because it first encountered 4 5 ° plane reflection The reflecting plated surface 41 of the mirror is focused on the first focus F 3 11 of the ellipsoidal reflector 3 1. Since the second focal point FI 11 2 of the ellipsoidal bulb 11 and the second focal point F311 of the ellipsoidal reflector 3! Overlap after being reflected by the 45 ° plane mirror 4, the light of the ellipsoidal bulb 11 is concentrated on the ellipsoidal surface. After the first focal point F3 11 of the reflective reflector is projected toward the ellipsoidal reflector 31. Through the reflection of the ellipsoidal reflector, the light passes through the small circular hole 42 located on the 45 ° plane reflector 4 and converges at the second focus F312 of the ellipsoidal reflector 31. After that, the light is homogenized by the column integrator 21 again. The advantages of this picture are as follows: (1) As can be seen from the simple ray tracing results of the seventh picture, the focusing point of the ellipsoidal reflector 31! The solid angle of ^ 12 is greater than the focusing point F of the ellipsoidal bulb 11. The solid angle of 111 2 is much smaller; (2) Effectively reduce the area of light distribution; (3) The symmetry of the top, bottom, left, and right of the beam in the light collection module is good, and it is easy to achieve the uniformity of 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 to assemble. See figure eight. The eighth figure differs from the seventh figure in that there is no inclined plane mirror, but there is a horizontal plane mirror 5 on the axis 2 of the symmetry axis A331 of the parabolic reflector 33. The base surface 332 of the parabolic reflector 33 reflects the object. The focal point of the cover is F3311, and its coating is reflected on the axis A331; this horizontal plane mirror 5 is a rectangular mirror,

Page 10 1222505 V. Description of the invention (8)

Its axis of symmetry lies on the axis A 3 31, and the straight side of the flat mirror is tangent to the focal point F3311 of the parabolic reflector 33. Because the focal point of the ellipsoidal bulb 11 is not a point defined mathematically-a point with no volume or size ', it is concentrated on a small area (here called the light-concentrating area) 1 3, and because of the spherical shape The bulb 11 is a symmetrical illumination light source, so the light spots in the light-concentrating region are also symmetrical. Therefore, the straight edges of the horizontal plane mirror 5 and the focal point F3311 of the parabolic reflector can bisect the light spots in the light-concentrating area into the left and right halves 31 and 132. The left half 131 is reflected by a horizontal plane mirror, and the right half 132 advances straight. Therefore, the light beam originally incident on the parabolic reflector 33 obliquely is converted into two symmetrical beams to the parabolic reflector 33 via the equal division of the horizontal plane mirror 5, so the light can be reflected symmetrically from the parabolic reflector. The hood 33 shoots. Since the incident light beam is divided into left and right M2 by the horizontal plane mirror 5, it can also be regarded as two focus points ^ and 33. The two points are the lower half parabolic reflector 334 and the upper half paraboloid. The focal points of the two reflectors, 333, so the upper and lower half parabolic anti-two focal points are optimized. As long as this is the case, the above is only a good example of the present invention. It can be used to limit the scope of the implementation of the present invention. Anyone who follows this guide: And repair, both should still fall within the scope of the invention patent.

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Other features and advantages of the present invention will be clearly understood in the following detailed description with reference to the preferred implementation of the drawings. In the drawings: The first figure is an explanatory diagram of the enterprise. The second figure is a light collection system of a conventional ellipsoidal reflector. The light reflects and converges at the second focal point of the ellipsoid through the ellipsoidal reflection surface, and then the light enters the cylindrical integrator to uniformize the light. The third figure is a light source light collecting system of a conventional parabolic lamp. The light is emitted in parallel through the parabolic lamp, and the light is focused on the focal point of the positive lens through a positive lens. Then it enters the cylindrical integrator for light homogenization. The fourth picture shows a small etendue light collection module. There is a layer of reflective layer (which can reflect visible light) on the surface of the right half of the quartz bulb of the burner on the lamp tube, 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 half toward the ellipsoidal reflector, and is reflected and converged at the second focal point of the ellipsoidal reflective 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.

1222505 Brief description of the diagram The double parabolic reflector is composed of a focal point of a parabolic reflector by a spherical mirror. Light first throw Reflector a cylindrical figure. This is the area with a 45 ° inclination in the center. The light from the ellipsoidal hood coincides with the ellipsoidal light from the top half of the plane [the conventional la bulb-type reflection source. The seventh figure of the light integrator is the reflection of the local small oblique mirror hood that collects the light. Converging eight pictures show the reflector on the focus of the ball light. However, the ball lamp shoots the reflection cover] The cover reflects the light along the original part and the cover is flattened and converged on the first. The set of the present invention is uniformly reflected by the following three areas. The spherical type of the present invention passes through any, through parabolic. The ellipsoidal light uses a horizontal beam of light. The light source, the spherical center of the spherical reflector, and the third point in common. The light from the lower half of the light source passes through the light source and then hits the first parabolic surface. The light reflected from the lower half is directed to the traveling light. The parallel light is then directed to the focus of the second parabolic reflector and the second parabolic reflector. use. The top view of the first preferred embodiment of the light system is composed of an ellipsoidal lamp and a 4-5. Tilt mirror, an ellipsoidal reflector. Because the second focus position of the ellipsoidal lamp is in common with the ellipsoidal position. The light from the ellipsoidal lamp passes through the second focal point of the reflector, which is partially hollowed out at the center inclined at 45 °. The plan view of the second preferred embodiment of the optical system is directly focused on the reflection of the parabolic reflector, the light is parallel to the first focal point and the focal reflector of the parabolic reflector is inside the parabolic reflector, which can be divided into Second, and get the upper and lower symmetric flat 1225505 supplementary drawings for a simple explanation 11 a ellipsoidal bulb 111a ellipsoidal reflector F 1111 a first focus FI 112a second focus 111 2a ellipsoidal reflector Symmetry axis 12a Parabolic bulb 121a Parabolic reflector F 1 2 11 a Focus 13a Tube 1 3 1 a Light source 132a Quartz sphere 1321a Reflective coating 1 3 2 2 a Electrode A1 3 3 Axis of the tube 2a Integrator 2 1 a column integrator 22a matrix lens integrator 3a reflector 31a ellipsoidal reflector 311a semi-ellipsoidal reflector F31 la ellipsoidal reflector first focus F312a ellipsoidal reflector 2nd focal point 32a spherical reflector C321 Spherical Reflector Center

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1W1U Brief Description of Drawings 33a Parabolic Reflector 331a First Parabolic Reflector F3311a First Parabolic Reflector Focus 332a Second Parabolic Reflector F332 1a Second Parabolic Reflector Focus 333a Half Parabolic Reflector 4a Positive Lens F 41 a Positive lens focus [Invention] 1 Bulb 11 Ellipsoidal bulb 111 Ellipsoidal reflector F1111 First focus F111 2 Second focus F111 3 Virtual focus A111 3 Spherical axis of plastic reflector 12 Light tube 1 21 Light source 122 Quartz sphere 1 3 Concentrating area (point) 1 31 Focus point Left half 132 Focus point Right half 2 Integrator 21-pillar integrator

Page 15 12225505 9a 5. 2〇 # [[: Month Day V > Brief description of the drawing 3 reflection cover 31 ellipsoidal reflection cover F311 ellipsoidal reflection cover first focus F312 ellipsoidal reflection cover second focus 33 Parabolic reflector F 3 3 11 Parabolic reflector focus A 3 31 Symmetry axis 3 3 2 Base point 333 Upper parabolic reflector F333 Focus of upper paraboloid reflector 334 Lower paraboloid reflector F334 Lower paraboloid Focus of the reflector 4 45 ° plane mirror 41 plane mirror coating surface 42 plane mirror round hole 5 horizontal mirror surface 51 coating reflection surface

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Claims (1)

1222505 6. Scope of patent application 1. A high-efficiency light source light-gathering module, including a light-concentrating light source system, at least one light-emitting source structure, and a common focus point, which is not light-emitting ^ The light beam is a cone-shaped body; a reflecting cover, the reflecting surface is curved, indirect reflection lines, at least one focus, the position of the focus is the same as the position of the focusing focus, and the reflection comes from the focus ^ beam 2. The high efficiency described in the item 丨 The size range of the reflector is as follows: the extension surface of a base point system radiating surface, the closest distance to the focal point and the line connecting the base point to the focal point are small at right angles. The connecting point of the reflector's end point is the point at which the point closest to the focal point on the cross section is the point with the longest focal distance, which is a range of 180 °. ‘3. The efficiency is as described in item 1 of the scope of the patent application, where the reflector may be an ellipsoidal reflector, or the cover’ or may be a free-form surface. 4. The high-efficiency light-concentrating light source system described in item 1 of the scope of the patent application can be an ellipsoidal surface 5. The high-efficiency light-concentrating light source system described in item 1 of the scope of the patent application can be a parabolic surface At 0, at least one position of the concentrator itself, the light source light collection module of the light source system from the light source of the light source, and the tangent line of the base point on or at the reflective surface; the reflector The large surface of the light source uses the focal point as the original point, and the light source light collecting module with the arc angle on the cross section that does not exceed the rate can be a light source light collecting module with a parabolic reflectance and a light bulb. Rate light source collection module, bulb and positive lens A high-efficiency light source light collecting module includes: Page 17 1222505 sm correction] MM year month A light-condensing light source system has at least one light source and at least one light-concentrating mechanism, and has a t-focus. This focus point is not at the position of the light-emitting source itself. The collected light beam is a cone-shaped body; a reflector The reflecting surface is a curved surface, which indirectly reflects light from the light source 'at least one focal point'. The position of this focal point is the same as the position of the focal point of the spotlight-type light source system, and it reflects the light beam from the focal point; On the reflection surface or on the extension surface of the reflection surface, the distance from the focal point is the closest, and the angle between the tangent of the point and the line connecting the point to the focal point is a right angle; a flat reflector, which focuses the light source The focal point of the system folds towards the reflector and passes the light beam from the reflector through the mirror. 7. As in the high-efficiency light source light-gathering module described in item 6 of the patent scope of Shenying, the flat reflector has a small light-transmitting area that does not affect the overall brightness excessively, and the light beam of the reflector can pass through. 8. The high-efficiency light source light-gathering module as described in item 6 of Shenqing's patent scope, the plane mirror 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. For the high-efficiency light source light collecting module as described in item 6 of Shenjing's patent scope, the right reflector is an ellipsoidal reflector, and its second focus passes through the light transmission area. 10. A high-efficiency light source light-gathering module, comprising: a light-concentrating light source system, at least one light source, at least one light-concentrating mechanism 'has a common focus point, and this focus point is not the position of the light source itself, The collected light beam is a cone-shaped body; a reflecting cover's reflecting surface is curved and indirectly reflects light from the light source 1222505 6. The line of the patent application, at least the location of the focal point is at the nearest point of reflection, and at a right angle A plane reflection tangent, reflection 11, such as the application group, the plane 12, such as the application group 'plane mirrors overlap 13, such as the application group, if the condenser, there is a pair of normal vector and line is a plane reflection Repair A focal point is set to be the same. The cutting mirror on the curved surface or at that point is located on the cover. The light source reflecting the patented range of the patented range mirror and the patented range mirror is called the axis. The efficiency of the mirror on the axis of symmetry Lamp light source system 14. A high-concentration type structure has a common focus point. The collected light beam has a cone-reflector cover, and the line can be divided into its focal point. This focal point reflects the reflection curve and the The reflector is a flat vector formed by inverting the plane of the tenth term from the edge of the tenth term of the focal plane, without weighting the plane of the tenth term system. The source collects light, at least this focused body; the position of the curved surface and the light source system of the t nine type light source system that gathers together, the light beam of the point · Sin π has a base point, and the extension surface t surface Θ 隹f J; Μ, the angle between the distance from the focal point and the line is inward, the point of the point where the household point is described by the focal point and the point of convergence is described by the surface of the converging lens, One edge with light beam. The high-efficiency and focus-high-efficiency are divided into two beams. The beam continues to be straight. The high-efficiency beam is in one position, and the focal point of the reflector is connected to the light source collecting mode. The light source collects the light module, which is inverse to the plane. The light source's light collection mode is symmetrical and tapered. The plane reflection mirror at the base point is the first reflection cover and the fourth point is on the same plane. The module includes: a light source, at least a condenser point, and a non-light source itself. Where it is located, 'Indirect reflection of the light from the light source. Two reflectors, each with its base point, each with an upper'. The first reflector and the first reflector 1222505 6. The scope of the patent application is bonded to each other; the function of the first reflector and the second reflector are the same; a flat mirror is located in the reflector, and one edge is located in the middle of the focus of the first reflector and the second reflector. > 15. The light source set light mode of the politic rate as described in item 14 of the scope of patent application, and wherein the focus point is not a mathematically defined point with no volume or size, but a small area Condensing point, located on the edge of the plane mirror, 疋: The product covers both the first and second reflectors, and ^ 1 and ^ t, part of the beam is reflected, so ... Therefore, 6, such as applying for a patent One of the scopes described in item I4 penetrates. Group, wherein the area of the light source collecting mode point of the light source with the first reflecting cover and the second reflecting horse efficiency is optimized and designed. Curved surface design, can focus on Page 20