CN101498415B - Light source and method for improving mixed light output efficiency based on phosphor powder - Google Patents

Abstract

A light source and method for improving mixed light emission efficiency based on fluorescent powder, including an excitation light source (1), especially, a spectroscopic filter (2), which can divide the excitation light into two paths through transmission and reflection, and one path is guided The stimulated material (3) is converted into excited light and then guided to the light source exit surface, and another path is guided to the light source exit surface to mix with the excited light; the two paths of light are completed by means of the first and second reflective surfaces respectively The guidance of the light source to obtain a predetermined ratio and higher efficiency of the mixed light output. The first reflective surface (4) can be made of a heat-conducting medium, and is in close contact with the excited material (3). The excited material (3) may include multiple types, distributed in different regions based on the turntable (5). By adopting the invention, while improving the efficiency of the light source, it has the advantages of convenient color design, long service life and low cost.

Description

Light source and method for improving mixed light output efficiency based on phosphor

Technical Field The present invention relates to a light source module, in particular to a light source module based on phosphor excitation, especially a light source structure and method with higher efficiency of outgoing mixed light by means of component combination. the

Background technology Since the early 1990s, with the rapid development of a new generation of semiconductor optoelectronic materials based on InGaAlP and InGaN, various high-power and high-brightness red, yellow, blue, green, ultraviolet and white LED light sources Emerge one after another, emerge in endlessly, have obtained more and more extensive application in various display and lighting fields. the

In addition to using light-emitting diodes of corresponding colors, the main technical solutions that can be used to obtain light sources of various colors (especially white light sources) are RGB light mixing and fluorescent conversion. Among them, the fluorescence conversion solution is to use the emitted light from other light sources (such as but not limited to LED chips) to excite the phosphor powder to generate light with a longer wavelength. For example, the white light LED patent of Japan's Nichia Corporation (Nichia) discloses a technical solution for using a 470nm blue LED chip to excite yellow YAG phosphors to emit white light. The scheme is simple in structure, low in manufacturing cost, and the product has strong practicability. the

The Chinese patent application with the application number 2005100720291 discloses a scheme for obtaining white light by fluorescent conversion. The fluorescent powder is coated on a mirror to separate it from the light-emitting diode. The mirror allows the light emitted by the fluorescent powder to pass through The reflection exits from the intended exit plane. In this solution, the light emitted by the light source is actually a mixed light of the excited light and the diffuse excitation light that is not absorbed and utilized by the phosphor powder. By using the light source structure disclosed in this proposal, only by changing the phosphor composition or distribution ratio, the color or chromaticity of light emitted by the light source can be designed. Its shortcoming is: because part of the excitation light that is not absorbed by the phosphor may be diffused to the excitation light source, and at the same time, a considerable part of the excited light is diffused to the excitation light source, so that these light rays are difficult to be fully utilized, reducing The efficiency of the mixed light output of the light source. At the same time, the proportion of the excitation light being diffused to the light source exit surface is generally very small, which has little influence on the chromaticity of the mixed light, which is not conducive to the adjustment design of the color or chromaticity of the light source. the

Summary of the invention The technical problem to be solved by the present invention is to propose a light source structure and its method in view of the deficiencies of the above-mentioned prior art, which is convenient to improve the output efficiency of light source mixed light with a simple combination of components, and further facilitates the control of light emitted by the light source. Color or shade to design. the

In order to solve the above-mentioned technical problems, the basic idea of the present invention is: use and select a spectroscopic filter that can transmit and reflect the excitation light at the same time, thereby dividing the excitation light into two paths, one path is directed to the stimulated material, and the other path Guide to the exit surface of the light source; use the necessary reflective surface to guide the two paths of light, one of which is converted into excited light by the excited material, so as to obtain a predetermined proportion of mixed light with higher output efficiency on the exit surface of the light source. the

One of the technical solutions to realize the concept of the present invention is to provide a method for improving the efficiency of mixed light emission based on phosphor powder, which is used for light sources, including steps:

A. The excitation light source included in the light source generates excitation light;

B. The light source includes a layer of excited material where the phosphor is located, and the excited material included in the phosphor is excited to emit light under the action of the exciting light; guide the excited light to the light exit surface of the light source ;

C. guiding part of the excitation light to the light exit surface of the light source;

D. The light source outputs mixed light;

In particular, in the step A, it also includes: selecting and setting a spectroscopic filter, so that the excitation light is obliquely directed towards the spectroscopic filter, and is divided into two paths by means of transmission and reflection respectively, and one path is directed to Described fluorescent powder is used for step B; Another way is used for step C;

In the step C, it also includes: setting a second reflective surface to reflect the excitation light from the spectral filter back to the spectral filter, so that the excitation light is divided into two paths, and one path is directed to the Exciting the light source, the other way leads to the light exit surface of the light source;

The step B further includes: setting a first reflective surface, guiding the excited light to the same side, and guiding the light to the light emitting surface of the light source after guiding the light splitting filter. the

In the above scheme, in the step A, the excitation light derived from the spectral filter is guided to the phosphor powder in a penetrating manner; correspondingly, the excited light in the step B is The dichroic filter guides the light exit surface of the light source in a reflective manner. the

In the above solution, in the step A, the excitation light derived from the spectral filter is guided to the phosphor powder in a reflective manner; correspondingly, the excited light in the step B is guided by the The light splitting filter guides the light exit surface of the light source in a penetrating manner. the

In the above scheme, the step C further includes: setting a second excited material layer between the dichroic filter and the second reflective surface close to or close to the second reflective surface, for accommodating the first Two fluorescent powders, so as to convert the excitation light guided from the spectral filter into the second excited light and guide it to the spectral filter, instead of the excitation light, it is guided to the light exit surface of the light source. the

The second technical solution to realize the concept of the present invention is to provide a light source for improving the output efficiency of mixed light based on fluorescent powder, including the excitation light source and the excited material layer where the fluorescent powder is located; the first excited material layer adjacent to the excited material layer The reflective surface guides the excited light of the phosphor powder to the same side of the first reflective surface through reflection, especially, it also includes a spectroscopic filter and a second reflective surface, and the excitation light source faces the spectroscopic A light filter, so that the excitation light is obliquely directed towards the light splitting filter, so as to be divided into two paths by the light splitting light filter in a transmission mode and a reflection mode; Both sides of the optical filter are respectively facing the excitation light guided by the spectral filter; thus the spectral filter simultaneously guides the excited light and a part of the excitation light reflected from the second reflective surface to the light exit surface of the light source. the

In the above solution, the spectroscopic filter is arranged between the excitation light source and the excited material layer, and guides a part of the excitation light from the excitation light source to the phosphor powder in a penetrating manner, while reflecting The other part of the excitation light from the excitation light source is guided to the second reflective surface by way of reflection; A part of the excitation light reflected from the second reflective surface is guided to the light exit surface of the light source in a transparent manner. the

In the above solution, the light exit surface of the excitation light source and the excited material layer are arranged on the same side of the spectral filter, and the respective planes intersect two by two, so that the spectral filter reflects A part of the excitation light from the excitation light source is guided to the phosphor powder, and at the same time, another part of the excitation light from the excitation light source is guided to the second reflective surface in a penetrating manner; guide the excited light of the phosphor powder to the light exit surface of the light source, and at the same time guide a part of the excitation light reflected from the second reflection surface to the light exit surface of the light source in a reflective manner. the

In the solution above, the light source further includes a second excited material layer, which is close to or close to the second reflective surface between the light splitting filter and the second reflective surface. the

In the above solution, the first reflective surface or the second reflective surface is made of a heat-conducting medium, which is in close contact with the excited material layer corresponding to the first reflective surface or the second reflective surface. the

In the solution above, the light source further includes a transparent light-guiding medium disposed on one side or both sides of the light splitting filter. the

In the above solution, it also includes a turntable carrying the excited material layer, centering on the rotation axis of the turntable, at least two kinds of excited materials are distributed in the excited material layer in subregions along the circumference; the first reflective surface Be fixed on the turntable, or be the disk surface of the turntable. the

By adopting the above technical solutions, the output efficiency of the mixed light is improved, and the light source can output higher brightness and power, and at the same time, it has the advantages of convenient color design, long service life, and low cost. the

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of the structure and principle of one of the light source embodiments of the present invention;

Figure 2 is a schematic diagram of the structural principle of a special case of the embodiment in Figure 1;

Figure 3 is an example diagram of the spectrum of white light obtained by the embodiment of Figure 1 or Figure 2,

The curve a1 represents the spectrum of the spectroscopic filter, the curve a2 represents the spectrum of the excitation light, and the curve a3 represents the spectrum of the excited light; 

Figure 4 is a schematic diagram of the structural principle of the second embodiment of the light source of the present invention;

Figure 5 is a schematic diagram of a special case of the embodiment in Figure 4 and its improved structure;

Figure 6 is an example diagram of the spectrum of the blue-green light obtained by the embodiment of Figure 4 or Figure 5,

The curve d1 represents the spectrum of the spectroscopic filter, the curve d2 represents the spectrum of the excitation light, and the curve d3 represents the spectrum of the excited light; 

Figure 7 is a schematic diagram of the principle of an improved structure of the light source of the present invention taking Figure 5 as an example.

         Figure 8 is an example diagram of the spectrum of white light obtained from another embodiment of the light source with an improved structure in the present invention 

The curve b1 represents the spectrum of the spectroscopic filter, the curve b2 represents the spectrum of the excitation light, and the curves b3 and b4 represent the spectra of the first and second excited light respectively;

The numbers in the above figures are: 1—excitation light source; 2—spectral filter; 3, 3'—stimulated material/stimulated material layer; 4—first reflective surface; 5—second Reflecting surface; 6—transparent light guide medium; 7—rotating shaft. the

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, the present invention will be further described in conjunction with the preferred embodiments shown in the accompanying drawings. the

Based on the steps included in the existing light source: make the excitation light source 1 of the light source generate excitation light, and send it to the excited material layer to stimulate the excited material 3 to emit light, and the excited light is guided to the light exit surface of the light source; Part of the excitation light that is not absorbed by the excited material 3 is guided to the light exit surface of the light source, and mixed with the excited light for output; the key to the method of the present invention is to select and set a spectroscopic filter 2 , the excitation light obliquely directed towards the spectral filter 2 is divided into two paths according to the transmission mode and the reflection mode, one path is guided to the excited material layer, and the other path is not provided to the excited material 3 for use. Instead, it is guided to the light exit surface of the light source, which can greatly increase the mixing ratio of the excitation light in the light output from the light source, thereby facilitating the adjustment of the color of the output light source. In order to adapt to the above distribution scheme for the excitation light and make the structure of the light source as simple and compact as possible, the method of the present invention further includes the step of: setting a second reflective surface 5 for diverting the non-identical light from the spectral filter 2 The path of excitation light provided to the excited material 3 is reflected back to the spectroscopic filter 2, so that part of the excitation light is divided into two paths, one path is directed to the excitation light source 1, and the other path is directed to the The light exit surface of the light source is used; the first reflective surface 4 is provided to reflect the excited light so as to guide the excited light scattered by the excited material 3 to the same side of the first reflective surface 4, and guide the light splitting The filter 2 is then guided to the light exit surface of the light source. the

According to this method, the light source of the present invention at least includes an excitation light source 1, an excited material layer where the excited material 3 is located, and a first reflective surface 4 adjacent to the excited material layer. The excited light is all guided to the same side of the first reflective surface 4; it also includes a spectroscopic filter 2 and a second reflective surface 5, the excitation light source 3 faces the spectroscopic filter 2, so that the excitation light is obliquely emitted To the spectral filter 2; the stimulated material layer and the second reflective surface 5 are separated on both sides of the spectral filter 2, respectively facing the excitation guided by the spectral filter 2. light. In the present invention, the excitation light source may be a point light source or a surface light source. When the excitation light source is a point light source, for the convenience of description, unless otherwise specified, in this description, the excitation light is used to replace the main optical axis light of the excitation light of the point light source. The principal optical axes of the light incident on this plane are in an orthogonal relationship. the

In the method of the present invention, according to the different distribution and use modes of the two excitation lights, the spectroscopic filter 2 having correspondingly different optical characteristics for the excited light should be selected. For example, when the excitation light leading to the excited material 3 is selected as the path derived from the spectral filter 2 in a penetrating manner, the excited light should be reflected by the spectral filter 2 The way is directed to the light exit surface of the light source, so the selected spectroscopic filter must also have a reflective effect on the excited light. Conversely, when the excitation light directed to the excited material 3 is selected as the path derived from the spectral filter 2 in a reflective manner, the excited light should be transmitted by the spectral filter 2 The light emitting surface of the light source is guided in a transparent manner, so that the selected dichroic filter must also have a transmissive effect on the excited light. the

This will be further clarified below by illustrating the light source structure of the embodiment. the

One of the structural embodiments of the light source of the present invention is shown in Figure 1, the spectral filter 2 is arranged between the excitation light source 1 and the excited material/excited material layer 3 1, and guide a part of the exciting light to the excited material/stimulated material layer 3 in a penetrating manner, and at the same time guide another part of the exciting light to the second reflective surface 5 in a reflective manner; Therefore, the spectroscopic filter also guides the excited light of the excited material 3 to the light exit surface of the light source in a reflective manner, and at the same time guides the excited light reflected from the second reflective surface 5 in a penetrating manner. A part is guided to the light exit surface of the light source. the

FIG. 2 is a special example of the structure of the light source in FIG. 1 . In this particular example, the light exit surface of the excitation light source 1 is approximately parallel to the plane where the excited material layer 3 is located, and is approximately at a 45-degree inclination angle to the plane where the spectral filter 2 is located, so that it is substantially parallel to the plane where the excited material layer 3 is located. The two reflective surfaces 5 are substantially orthogonal. The angle setting of the structure will maximize the use of light and make the structure of the light source more compact. However, the embodiment in FIG. 1 is convenient to flexibly set the light source according to the actual size requirement, and also has its merits. the

The embodiment in FIG. 3 illustrates the selection of the characteristics of the spectral filter 2 in the structure of the light source in the above-mentioned FIG. 1 and FIG. 2 . Curve a2 represents the spectrum of excitation light, which is blue light; curve a3 represents the spectrum of excited light, such as selecting yellow light, using (but not limited to) 00901 of Hongda Company in Taiwan, then the spectrum of the spectral filter 2 can be as follows As shown in the curve a1, it is designed to allow incident light of shorter wavelengths to pass through, and the turning point of its wave-pass characteristics is in the blue light region, so that part of the blue light can be transmitted while the other part of the blue light can be reflected. Changing the position of the turning point of the wavepass characteristic of the curve a1 can adjust the ratio of transmitted and reflected blue light, thereby changing the mixing ratio of blue light and yellow light at the light source output end, and then can design white light with different color temperatures. the

The second structural embodiment of the light source of the present invention is shown in Figure 4: the light exit surface of the excitation light source 1 and the excited material 3 are arranged on the same side of the spectral filter 2, and the respective planes are two by two. Intersect, so that the spectral filter 2 guides a part of the excitation light from the excitation light source 1 to the excited material 3 in a reflective manner, and at the same time guides another part of the excitation light from the excitation light source 1 in a penetrating manner Guided to the second reflective surface 5; the dichroic filter 2 also guides the excited light of the excited material 3 to the light exit surface of the light source in a penetrating manner, and at the same time guides the light from the second reflection surface in a reflective manner Part of the excitation light reflected by the reflective surface 5 is directed to the light exit surface of the light source. the

FIG. 5 is a special example of the structure of the light source in FIG. 4 . The light exit surface of the excitation light source 1 is approximately orthogonal to the plane where the excited material 3 is located, and is at an angle of approximately 45 degrees to the plane where the spectral filter 2 is located, so that the light exit of the excitation light source 1 The surface is approximately parallel to the second reflective surface 5 . the

The embodiment in FIG. 6 illustrates the selection of the characteristics of the light-splitting filter 2 in the light source structures in the above-mentioned FIGS. 4 and 5 . Wherein the curve d2 represents the blue light spectrum of the excitation light, and the curve d3 represents the green light spectrum of the excited light; then the spectrum of the spectral filter 2 can be designed to pass the incident light of a longer wavelength as shown in the curve d1, thereby It can transmit green light, and can transmit some blue light while reflecting another part of blue light. Similarly, by changing the position of the turning point of the wavepass characteristic of the curve d1, the color or chromaticity of the outgoing mixed light can be affected by adjusting the ratio of blue light transmission and reflection. If assume as shown in the figure that the transmittance ratio of the spectral filter 2 in this embodiment to blue light is 20%, then the other 80% of the blue light will be reflected to the fluorescent powder to excite yellow light; and pass through the spectral filter When the 20% blue light of the light sheet 2 is reflected back to the spectral filter 2 by the second reflective surface 5, 20%*80%=16% of the blue light will enter the light exit surface of the light source by reflection, and 20%*20%=4% of the blue light returning to the excitation light source 1 in a penetrating manner can be regarded as the loss of excitation light of the light source system. It can be seen that the loss can be very low, so that the light source of the present invention can provide higher output efficiency of mixed light than the prior art. In other words, on the premise that the output efficiency of the mixed light is not lower than that of the existing mixed light, the light source of the present invention can easily and widely change the color of the output light only by replacing the spectral filter 2 . the

In the light source of the present invention, when the light output power is relatively large, the first reflective surface 4 can be formed with a heat-conducting medium, and it can be made to be in close contact with the excited material/stimulated material layer 3, so as to diffuse the fluorescent powder in time Avoid heat build-up. In this way, the light conversion efficiency of the excited material can be improved, and at the same time, the service life of the excited material can be extended. The thermal conductivity of the heat-conducting medium at room temperature is preferably greater than 10W/(m.K) (watts/meter*Kelvin), and metal (such as but not limited to aluminum) or heat-conducting ceramics can be used. The first reflective surface 4 can also be connected to a heat sink, or be a surface of the heat sink. According to the power design of the light source system, auxiliary heat dissipation means such as an exhaust fan can be added if necessary, because it belongs to the prior art, so it will not be described again. the

In order to further reduce the loss of light, the method of the present invention can also add a transparent light-guiding medium on one or both sides of the spectral filter in each of the above-mentioned embodiments, and conduct the excitation light or the excited light conduction. Taking the transparent light-guiding medium 6 shown by the dotted line in FIG. 2 and FIG. 4 as an example, a glass prism (such as but not limited to a triangular prism) can be used. One side of the prism is set close to the spectral filter 2, and the other side is close to the light exit surface of the excitation light source 1 or the excited material 3, or the second reflection 5, so that in the light transmission process The prism can function as an optical waveguide. the

Fig. 7 illustrates the improvement method that can also be implemented in the light source structure of the present invention, taking Fig. 5 as an example to improve (also applicable to Fig. 4), specifically: as shown in the dotted line, a turntable is added to carry two or two Excited materials 3 and 3' above. In particular, these excited materials can be distributed in the excited material layer in subregions along the circumference with the rotation axis 7 of the turntable as the center. The first reflective surface 4 may be the disk surface of the turntable, or the surface of a radiator fixed on the turntable. In this way, on the one hand, in the light source system with exhaust fan, the rotating motion of the turntable can accelerate the heat diffusion on the excited material; , it can be considered that as the turntable rotates, when the excitation light irradiates different excited light materials, different colors of excited light can be obtained. Select a suitable spectroscopic filter 2 that can reflect or transmit these two kinds of excited light at the same time, then at different times, the color of the excited light that is directed to the same position of the spectroscopic filter 2 is continuously rotated, which can make the output excited light The light mixes uniformly and mixes with the part of the excitation light that is directed towards the light exit surface. An embodiment of using this improved structure to obtain a white light source can be: set the excitation light to blue light; the first excited material 3 and the second excited material 3' distributed in different regions use green fluorescent powder and red fluorescent powder respectively Powder, excited green light and red light; select a described spectroscopic filter 2 to have a certain transmittance to the blue light, and have a transmission effect on the green light and red light, then the output of the light source The emitted light is a mixed white light of a predetermined amount of blue light and green light and red light transmitted through the spectral filter 2 . In this embodiment, a third excited material, such as yellow fluorescent powder, can also be added, so as to obtain mixed white light composed of four colors of red, blue, green and yellow. the

This improved structure can also be carried out based on FIG. 1 and FIG. 2 , only need to change the characteristics of the two or more kinds of excited light of the spectral filter 2 correspondingly, which will not be repeated here. the

When the light source of the present invention includes at least two kinds of excited materials, in addition to uniformly mixing and distributing the two kinds of excited materials in the excited material layer, or distributing them according to the above-mentioned embodiment of the improved structure, it is also possible to Consider the improvement of the light source: based on the light source structure shown in Figure 1, 2, 4 or 5, between the spectral filter 2 and the second reflective surface 5, close to or close to the second reflective surface The position of the surface 5 is provided with a second excited material layer, which is used to accommodate the second excited material; using the second excited material to convert the excitation light of this path into the second excited light, through the selected suitable The dichroic filter 2 is used to guide the light exit surface to at least mix with the first excited light. FIG. 8 shows the relevant spectrum of an embodiment for obtaining a white light source, taking the above improved structure based on the structure shown in FIG. 4 or FIG. 5 as an example. Wherein the curve b2 represents the spectrum of the exciting light, such as ultraviolet light; the curve b3 represents the spectrum of the excited light of the first excited material 3 (for example, yellow phosphor powder), which is yellow; the curve b4 represents the second stimulated light. The spectrum of the excited light of the laser material (for example, blue phosphor powder) is blue; the curve b1 represents the spectral characteristics of the spectral filter 2, which is selected to have a certain transmittance to the ultraviolet light, and is selected to have a certain transmittance to the ultraviolet light. The blue light has a reflection effect and has a transmission effect on the yellow light; the outgoing light of the light source is a mixture of the blue light reflected by the spectroscopic filter 2 and the yellow light transmitted through the spectroscopic filter 2 White light, at this time, due to the absorption of the excitation light by the second excited material, the excitation ultraviolet light in the light source that can return to the excitation light source 1 is extremely small, and there is almost no optical loss in the system. the

Similarly, changing the characteristics of the spectroscopic filter 2 for the two kinds of excited light, this improvement is also applicable to the structures shown in FIG. 1 and FIG. 2 , and will not be repeated here. In this improved structure, the second reflective surface can also be formed by a heat-conducting medium, and the second excited material layer can be closely attached to the second reflective surface 5 . The second reflective surface 5 can also be connected to a heat sink, or be a surface of the heat sink. the

In the light source module with the structure of the present invention, the heat sink may also be the heat conduction shell of the light source module, and the first reflective surface 4 or the second reflective surface 5 is the inner wall of the shell, or is fixed on the shell Or a mirror set based on the inner wall of the housing. the

Claims (20)

1. one kind is improved the light source of mixed light outgoing efficient based on fluorescent powder, comprises the material layer of being excited at excitation source (1), fluorescent powder (3) place; Be excited adjacent first reflecting surface (4) of material layer with this, make the stimulated luminescence of this fluorescent powder (3) all be led the same side toward this first reflecting surface (4) by reflection; It is characterized in that:

Also comprise beam split optical filter (2) and second reflecting surface (5), described excitation source (1) makes the excitation line oblique fire to this beam split optical filter (2), to be divided into two-way by this beam split optical filter (2) with mode of penetrating and reflection mode in the face of described beam split optical filter (2); Described material layer and second reflecting surface (5) of being excited splits in the both sides of described beam split optical filter (2), roughly just meeting the excitation line that comes to by this beam split optical filter (2) guiding respectively; Thereby this beam split optical filter (2) guide simultaneously a described stimulated luminescence and a part reflect the light-emitting face from the past described light source of exciting light of described second reflecting surface (5).

2. according to the described light source of claim 1, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described beam split optical filter (2) is arranged on described excitation source (1) and described being excited between the material layer, in the mode of penetrating a part is led toward described fluorescent powder (3) from the excitation line of described excitation source (1), in the reflection mode another part is led toward described second reflecting surface (5) from the excitation line of described excitation source (1) simultaneously;

This beam split optical filter (2) also in the reflection mode with the photoconduction that is stimulated of described fluorescent powder (3) toward the light-emitting face of this light source, will lead light-emitting face from the part of the excitation line of described second reflecting surface (5) reflection in the mode of penetrating simultaneously toward this light source.

3. according to the described light source of claim 2, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

The light-emitting face of described excitation source (1) and described plane almost parallel of being excited the material layer place roughly are 45 degree inclination angles with the plane at described beam split optical filter (2) place.

4. according to the described light source of claim 1, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

The light-emitting face of described excitation source (1) and the described material layer of being excited are arranged on the same side of described beam split optical filter (2), intersect in twos on the plane at place separately, thereby described beam split optical filter (2) is led a part toward described fluorescent powder (3) from the excitation line of described excitation source (1) in the reflection mode, in the mode of penetrating another part is led toward described second reflecting surface (5) from the excitation line of described excitation source (1) simultaneously;

This beam split optical filter (2) also in the mode of penetrating with the photoconduction that is stimulated of described fluorescent powder (3) toward the light-emitting face of this light source, will lead light-emitting face from the part of the excitation line of described second reflecting surface (5) reflection in the reflection mode simultaneously toward this light source.

5. according to the described light source of claim 4, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described excitation source (1) light-emitting face and described plane of being excited the material layer place be quadrature roughly, and the plane with described beam split optical filter (2) place roughly is 45 degree angles respectively.

6. according to the described light source of claim 1, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Comprise that also second is excited material layer, between described beam split optical filter (2) and second reflecting surface (5) near or be close to described second reflecting surface (5).

7. according to the described light source of claim 6, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described second reflecting surface (5) is made of heat-conducting medium, is close to described second and is excited material layer.

8. according to the described light source of claim 1, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described first reflecting surface (4) is made of heat-conducting medium, is close to the described material layer of being excited.

9. according to claim 7 or 8 described light sources, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described first reflecting surface (4) or second reflecting surface (5) connect heating radiator, or are a surface of described heating radiator.

10. according to the described light source of claim 9, it is characterized in that based on fluorescent powder raising mixed light outgoing efficient:

Described heating radiator is the thermal conductive shell of described light source; Described first reflecting surface (4) or second reflecting surface (5) are the inwall of this shell, or the minute surface for being fixed on this shell or being provided with based on this outer casing inner wall.

11., it is characterized in that according to each described light source of claim 1～5 based on fluorescent powder raising mixed light outgoing efficient:

Also comprise transparent light guide medium (6), be arranged on the one or both sides of described beam split optical filter (2).

12., it is characterized in that according to the described light source of claim 11 based on fluorescent powder raising mixed light outgoing efficient:

Described transparent light guide medium (6) is the triangular glass column, is close to described beam split optical filter (2) with a side.

13., it is characterized in that according to the described light source of claim 1 based on fluorescent powder raising mixed light outgoing efficient:

Also comprising the described rotating disk of being excited material layer of carrying, is the center with the rotating shaft (7) of this rotating disk, has at least two kinds of fluorescent powder (3,3 ') to be distributed in the described material layer of being excited along the circumference subregion; Described first reflecting surface (4) is fixed on this rotating disk, or is the card of described rotating disk.

14. the method based on fluorescent powder raising mixed light outgoing efficient is used for light source, comprises step:

A. the included excitation source (1) of this light source produces exciting light;

B. this light source comprises the material layer of being excited at fluorescent powder (3) place, this fluorescent powder (3) stimulated luminescence under the effect of described exciting light; With the light-emitting face of described stimulated luminescence guiding toward described light source;

C. with the light-emitting face of part exciting light guiding toward described light source;

D. this light source is exported mixed light;

It is characterized in that,

Also comprise in described steps A: select and a beam split optical filter (2) is set, make described exciting light oblique fire to this beam split optical filter (2), be divided into two-way with mode of penetrating and reflection mode respectively, the one tunnel leads toward described fluorescent powder (3), uses for step B; Use for step C on another road;

In described step C, also comprise: second reflecting surface (5) is set, to lead this beam split optical filter (2) of exciting light reflected back from described beam split optical filter (2), thereby this exciting light is divided into two-way again, and one the tunnel leads toward described excitation source (1), and the light-emitting face toward described light source is led on another road;

In described step B, also comprise: first reflecting surface (4) is set, described stimulated luminescence is guided toward the same side, and the light-emitting face toward described light source is led in described beam split optical filter (2) back of leading.

15., it is characterized in that according to the described method of claim 14 based on fluorescent powder raising mixed light outgoing efficient:

In the described steps A, be the one tunnel described past described fluorescent powder (3) of photoconduction that excites of deriving by described beam split optical filter (2) with in the mode of penetrating; Correspondingly, stimulated luminescence described in the step B by this beam split optical filter (2) with the lead light-emitting face of described light source of reflection mode.

16., it is characterized in that according to the described method of claim 14 based on fluorescent powder raising mixed light outgoing efficient:

In the described steps A, be the one tunnel described past described fluorescent powder (3) of photoconduction that excites of deriving by described beam split optical filter (2) with in the reflection mode; Correspondingly, stimulated luminescence described in the step B by this beam split optical filter (2) with the lead light-emitting face of described light source of the mode of penetrating.

17., it is characterized in that according to the described method of claim 14 based on fluorescent powder raising mixed light outgoing efficient:

Also comprise among the described step C: between described beam split optical filter (2) and second reflecting surface (5) near or the position of being close to described second reflecting surface (5) be provided with second and be excited material layer, be used for holding second fluorescent powder (3 '), thereby the exciting light that will lead from described beam split optical filter (2) converts second stimulated luminescence to and leads past described beam split optical filter (2), replaces described exciting light to be directed the light-emitting face of past described light source.

18., it is characterized in that according to the described method of claim 17 based on fluorescent powder raising mixed light outgoing efficient:

Described second reflecting surface (5) is made of heat-conducting medium, is configured to be close to described second and is excited material layer.

19., it is characterized in that according to the described method of claim 14 based on fluorescent powder raising mixed light outgoing efficient:

Described first reflecting surface is made of heat-conducting medium, is configured to be close to the described material layer of being excited.

20., it is characterized in that according to the described method of claim 14 based on fluorescent powder raising mixed light outgoing efficient:

Described fluorescent powder (3) comprises at least two kinds, and the rotating shaft (7) that is configured to a rotating disk is the center, distributes along the circumference subregion.

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