Fluorescence excitation light source

Abstract

The invention discloses a fluorescence excitation light source. The fluorescence excitation light source comprises a shell cavity with a central axis symmetrical structure, the fluorescent structure is arranged on the central axis; the plurality of light source chips are arranged in different directions of the inner surface of the cavity of the shell and are symmetrically arranged by taking the position of the fluorescent structure as the center; the shell cavity is provided with a light-emitting through hole located in the central axis. The end face of one end of the fluorescent structure is arranged in the light outlet through hole. The light source chip is used for outputting exciting fluorescent light to the fluorescent structure, and wavelength limitation does not exist; and each light source chip performs high-efficiency excitation on the fluorescent structure from a plurality of different angles, so that high-light-power output of light beams in a wider wave band interval is realized, and the high-light-power fluorescent light source can be widely applied to various different industries.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and particularly to a fluorescence excitation light source. Background Art

[0002] With the wide application of light source devices in fields such as electronic appliances, medicine, and industry, the demand for high light power of light source devices in the industry is becoming increasingly common.

[0003] Currently, the high light power light sources on the market mainly use lasers formed by semiconductor light source technology. Lasers have the characteristic of being able to output high light power laser, but the range of laser wavelengths that can be output has certain limitations. For example, green lasers only include lasers that can output laser with a wavelength of about 532 nm, while yellow lasers only contain lasers that can output laser with a wavelength of about 589 nm. This limits the application of lasers in practice and makes it difficult to meet the needs of some special applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a fluorescence excitation light source, which can achieve the output of high light power of light beams in a wider wavelength band range and can be widely applied to various different industries.

[0005] To solve the above technical problems, the present invention provides a fluorescence excitation light source, including:

[0006] A housing cavity with a symmetric structure having a central axis;

[0007] A fluorescence structure disposed on the central axis;

[0008] A plurality of light source chips built in different orientations on the inner surface of the housing cavity and symmetrically arranged with the position of the fluorescence structure as the center;

[0009] Light output through holes that are symmetric about the central axis and whose planes are perpendicular to the central axis are provided on the housing cavity;

[0010] The fluorescence structure has a light output end face covering the area where the light output through hole is located, and the fluorescent light waves generated by the fluorescence structure excited by each light source chip are output through the light output end face and the light output through hole.

[0011] In an optional embodiment of the present application, the housing cavity is a columnar cavity; the fluorescence structure is a fluorescent rod disposed on the central axis and whose length direction is parallel to the central axis;

[0012] The light source chips are evenly and symmetrically arranged around the fluorescent rod on the inner side wall of the columnar cavity;

[0013] The light-emitting through hole is located on the first end face of the columnar cavity and has the same cross-sectional shape as the fluorescent rod;

[0014] Wherein, the inner radius of the outer shell cavity is an integer multiple of the wavelength of the light wave output by the light source chip.

[0015] In an optional embodiment of the present application, the outer shell cavity is a cylindrical cavity; the fluorescent structure is a fluorescent cylindrical rod.

[0016] In an optional embodiment of the present application, a reflection element is further connected to the inner surface of the second end face of the outer shell cavity;

[0017] The end face of the first end of the fluorescent rod is the light-emitting end face; the second end of the fluorescent rod is arranged in contact with the reflection element; a first semi-transparent semi-reflective layer is arranged in contact with the first end of the fluorescent rod for semi-transparent semi-reflective transmission of the fluorescent light output by the excited fluorescent rod;

[0018] The distance between the reflection element and the first semi-transparent semi-reflective layer is equal to an integer multiple of half the wavelength of the fluorescent light.

[0019] In an optional embodiment of the present application, the outer shell cavity is a partial spherical cavity formed by splicing a spherical shell and an aspherical shell;

[0020] Each of the light source chips is arranged on the inner surface of the spherical shell;

[0021] The fluorescent structure is a fluorescent partial sphere having the same shape as the partial spherical cavity and the center of the sphere coinciding with the center of the partial spherical cavity;

[0022] On the aspherical shell, the light-emitting through hole is opened corresponding to the center region of the partial spherical cavity.

[0023] In an optional embodiment of the present application, the outer shell cavity includes a hemispherical shell and a circular plate shell with the same radius; the hemispherical shell and the circular shell are spliced with each other to form a hemispherical cavity;

[0024] The fluorescent structure is a fluorescent hemisphere arranged at the center of the circular plate shell;

[0025] The light-emitting through hole is a circular through hole located at the center of the circular plate shell and having the same radius as the fluorescent hemisphere;

[0026] The planar surface of the fluorescent hemisphere is the light-emitting end face.

[0027] In an alternative embodiment of the present application, a second semi-transmissive and semi-reflective layer is further provided on the spherical surface of the fluorescent hemisphere for semi-transmissive and semi-reflective transmission of the excitation light output by the light source chip;

[0028] The difference between the radius of the fluorescent hemisphere and the radius of the hemispherical cavity is equal to an integer multiple of half the wavelength of the excitation light.

[0029] In an alternative embodiment of the present application, a radiator is further attached to the outer surface of the outer shell cavity.

[0030] In an alternative embodiment of the present application, a condenser lens and a collimating lens are further provided outside the outer shell cavity opposite to the light output through hole.

[0031] In an alternative embodiment of the present application, the light source chip is a blue light LED chip or a laser chip;

[0032] The wavelength of the fluorescent light output by the excitation of the fluorescent structure is 460 nm to 650 nm.

[0033] A fluorescent excitation light source provided by the present invention includes an outer shell cavity having a central axis symmetric structure; a fluorescent structure provided on the central axis; a plurality of light source chips symmetrically arranged at different positions on the inner surface of the outer shell cavity with the position of the fluorescent structure as the center; a light output through hole located on the central axis is provided on the outer shell cavity; one end face of the fluorescent structure is arranged in the light output through hole.

[0034] In the present application, the light source device uses the light source chip as the excitation light source to output excitation light to the fluorescent structure, so that the fluorescent structure is excited to generate fluorescent light; on this basis, in order to achieve the output of high light power in the present application, the fluorescent structure and the light source chip are jointly arranged in the outer shell cavity, and the axisymmetric structure of the outer shell cavity is used to make each light source chip surround and distribute with the fluorescent structure as the center, so that each light source chip can fully excite the fluorescent structure from multiple different angles. At the same time, part of the excitation light output by the light source chip can be efficiently absorbed and utilized by the fluorescent structure after being repeatedly reflected in the outer shell cavity. Thus, the excitation efficiency of the fluorescent structure is maximally improved, and finally a high light power beam can be output from the light output through hole of the outer shell cavity; and because the finally output beam is output by the excitation of the fluorescent structure, therefore, in the present application, a suitable fluorescent material can be selected based on actual needs to form the fluorescent structure, so as to obtain the light wave of the required wavelength band without wavelength limitation. It can be seen that in the present application, the output of high light power of the beam in a wider wavelength band range can be realized, and it can be widely applied to various different industries. Description of the Drawings

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0036] Figure 1 Schematic diagram of the first optical path structure of the fluorescence excitation light source provided by the embodiment of the present application;

[0037] Figure 2 Schematic diagram of the cross-section of the fluorescence excitation light source provided by the embodiment of the present application;

[0038] Figure 3 Schematic diagram of the second optical path structure of the fluorescence excitation light source provided by the embodiment of the present application;

[0039] Figure 4 Schematic diagram of the third optical path structure of the fluorescence excitation light source provided by the embodiment of the present application;

[0040] In the accompanying drawings: 10 is a columnar cavity, 100 is a light output through-hole, 110 is a cylindrical cavity, 12 is a partial spherical cavity, 121 is a partial spherical shell, 122 is a conical shell, 120 is a hemispherical cavity, 1201 is a spherical shell, 1202 is a circular sheet shell, 21 is a fluorescent rod, 210 is a fluorescent cylindrical rod, 220 is a fluorescent partial sphere, 221 is a fluorescent hemisphere, 3 is a light source chip, 4 is a first semi-transmissive semi-reflective layer, 5 is a reflecting element, 6 is a condenser lens, 7 is a collimating lens, and 8 is a radiator. Detailed implementation manners

[0041] The core of the present invention is to provide a fluorescence excitation light source capable of outputting high-power light beams in a wider wavelength band range.

[0042] To enable those skilled in the art to better understand the solution of the present invention, the following will further elaborate on the present invention in conjunction with the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0043] As Figure 1 and Figure 2 shown, Figure 1 Schematic diagram of the optical path structure of the fluorescence excitation light source provided by the embodiment of the present application; Figure 2 Schematic diagram of the cross-section of the fluorescence excitation light source provided by the embodiment of the present application.

[0044] In a specific embodiment of the present application, the fluorescent excitation light source may include:

[0045] A housing cavity having a symmetrical structure with a central axis;

[0046] A fluorescent structure disposed on the central axis;

[0047] A plurality of light source chips 3 are built into the inner surface of the shell cavity at different positions and are symmetrically arranged with the fluorescent structure as the center;

[0048] The shell cavity is provided with a light-emitting through hole 100 which is symmetrical about the central axis and the plane where it is located is perpendicular to the central axis;

[0049] The fluorescent structure has a light-emitting end face that covers the area where the light-emitting through hole 100 is located. The fluorescent light waves generated by the fluorescent structure being excited by each light source chip 3 are output through the light-emitting end face and the light-emitting through hole 100.

[0050] As for the light source chip 3 used to output excitation light to the fluorescent structure in this embodiment, a blue light LED chip or a laser chip can be used, and this is not specifically limited in this application.

[0051] like Figure 1 As shown, in Figure 1 The housing cavity shown is a cylindrical cavity 10, that is, a symmetrical cavity structure having a central axis; Figure 1 The fluorescent structure is a fluorescent stick 21 arranged on the central axis of the shell cavity; when each light source chip 3 is arranged in contact with the inner surface of the shell cavity, the light source chips 3 can be distributed around the fluorescent structure at different positions of the fluorescent structure, so that each light source chip 3 concentrates on outputting excitation light to the fluorescent structure, so that the fluorescent structure can be fully excited.

[0052] The fluorescent structure in the present embodiment can be a structure formed by mixing fluorescent powder particles and light-transmitting glue and then solidifying and plasticizing; thus, the fluorescent powder particles in the fluorescent structure can output fluorescent light when irradiated by the excitation light output by the light source chip 3; the type of fluorescent powder particles in the fluorescent structure can be selected based on the band range of the fluorescent light required for the actual application; for example, when the fluorescent excitation light source is required to output a yellow light beam, the fluorescent powder in the fluorescent structure is a material that is excited to produce yellow light; when the fluorescent excitation light source is required to output a green light beam, the fluorescent powder in the fluorescent structure is a material that is excited to produce green light; and currently, fluorescent materials that can be excited to produce light of various different bands are relatively abundant, so the fluorescent structure in the present embodiment is excited to output fluorescent light with a wavelength in the band range of 460nm to 650nm, that is, the fluorescent light beam that can be output by the fluorescent excitation light source in the present embodiment has no band range restrictions at all, which can fully meet the needs of different applications.

[0053] In addition, the doping concentration of the phosphor particles doped in the fluorescent structure should be within a reasonable doping concentration range, so that the doping concentration of the phosphor particles in the fluorescent structure is not too high, ensuring that the fluorescent structure itself has good light transmittance. Of course, the particle size of the phosphor particles should also be as small as possible to further ensure the light transmittance of the fluorescent structure. At the same time, the doping concentration of the phosphor particles in the fluorescent structure cannot be too low, so as to ensure that the light emitted by the excited fluorescent structure has a sufficiently high optical power.

[0054] As shown above, the fluorescent structure in this embodiment should itself have good light transmittance. A part of the surface of the fluorescent structure can be directly used as the light-emitting end face. An optical through-hole 100 is opened on the outer shell cavity, and the surface area of the fluorescent structure covering the optical through-hole 100 is the light-emitting end face. Thus, the fluorescent light generated by the excitation of the fluorescent structure can pass through the fluorescent structure and be output through the light-emitting end face and the optical through-hole 100.

[0055] In practical applications, the shape and structure of the fluorescent structure should be similar to the shape and structure of the outer shell cavity, only the size is different. This can ensure that the distances between each light source chip 3 provided on the inner surface of the outer shell cavity and the surface of the fluorescent structure are the same. In addition, the light source chips 3 are evenly distributed on the inner surface of the outer shell cavity. Thus, since the light source chips 3 are symmetrically arranged with the fluorescent structure as the center and are evenly distributed on the inner surface of the outer shell cavity, the excitation light received by the fluorescent structure is also symmetrically and evenly distributed. Further, combined with the fact that the distances between each light source chip 3 and the fluorescent structure are the same, it can ensure to a certain extent that the spot brightness of the fluorescent beam emitted by the excited fluorescent structure has the characteristic of high uniformity.

[0056] In addition, the optical through-hole 100 on the outer shell cavity and the light-emitting end face on the fluorescent structure are both symmetrically arranged about the central axis, which can also ensure to a certain extent the central symmetry of the spot brightness of the fluorescent beam output by the fluorescent structure through the light-emitting end face and the optical through-hole 100, and further improve the uniformity of the spot brightness of the fluorescent beam to a certain extent.

[0057] In addition, the outer shell cavity in the present application can adopt a cavity structure with good heat conduction performance such as a metal cavity or a ceramic cavity; when the outer shell cavity is a metal cavity, the inner surface of the metal cavity can be processed to form a polished surface, so that the inner surface of the metal cavity has a better reflective effect; when the outer shell cavity is a ceramic cavity, a reflective film layer can be provided on its inner surface. In short, the inner surface of the outer shell cavity in this embodiment should be set as a surface with a better reflective effect as much as possible. When a part of the excitation light output by the light source chip 3 is not absorbed by the phosphor particles in the fluorescent structure, it can also be incident on the fluorescent structure after multiple reflections in the outer shell cavity, thereby improving the utilization rate of the excitation light output by the light source chip 3.

[0058] For ease of understanding, the technical solution of the present application will be further described in detail below with specific embodiments.

[0059] Refer to Figure 1 and Figure 2 In an optional embodiment of the present application, the fluorescence excitation light source may include:

[0060] A columnar cavity 10 with an outer shell cavity; a fluorescent structure is a fluorescent rod 21 arranged on the central axis and parallel to the central axis in the length direction;

[0061] The light source chip 3 is uniformly and symmetrically arranged around the fluorescent rod 21 on the inner side wall of the columnar cavity 10;

[0062] The light-emitting through hole 100 is located on the first end face of the columnar cavity 10 and has the same cross-sectional shape as the fluorescent rod 21;

[0063] Wherein, the inner radius of the outer shell cavity is an integer multiple of the wavelength of the light wave output by the light source chip 3.

[0064] As Figure 1 shows a schematic cross-sectional structure diagram of the fluorescence excitation light source along the central axis direction; Figure 2 is a schematic cross-sectional structure diagram of the fluorescence excitation light source along the direction perpendicular to the central axis. Combining Figure 1 In this embodiment, the outer shell cavity can adopt a columnar cavity 10 symmetrical about the central axis; as Figure 2 shown, the columnar cavity 10 can be further a cylindrical cavity 110, and correspondingly, the fluorescent rod 21 can also be further a fluorescent cylindrical rod 210.

[0065] Of course, the columnar cavity 10 can also be a square prism cavity, that is, a cuboid cavity with a square cross-section. Correspondingly, the fluorescent structure is a fluorescent square prism rod. Similarly, the columnar cavity 10 can also be a regular hexagonal prism cavity or a regular octagonal prism cavity, or other non-prismatic cavities. Correspondingly, the shape of the fluorescent structure is always consistent with the shape of the columnar cavity 10 and is always located on the central axis.

[0066] Referring to Figure 1 and Figure 2 , when the outer shell cavity is a cylindrical cavity 110, each light source chip 3 is uniformly arranged in a cylindrical shape on the inner surface of the cylindrical cavity 110. Thus, for each small segment of the fluorescent cylindrical rod 210, it is equivalent to having a circle of light source chips 3 arranged in a 360-degree surround. That is, each small segment of the fluorescent cylindrical rod 210 can be fully excited by the light source chips 3 at 360 degrees. In addition, the light output through hole 100 is provided on the first end face of the cylindrical cavity 110, and the first end face of the fluorescent cylindrical rod 210 (the end face close to the light output through hole 100) serves as the light output end face. The area shape of this light output end face is the same as the cross-sectional shape of the fluorescent cylindrical rod 210 and is the same as the area shape of the light output through hole 100. Thus, the edge of the light output end face is adhesively connected to the edge of the light output through hole 100. Thus, among the fluorescent light rays generated by the excitation of the fluorescent cylindrical rod 210, the light rays with a smaller angle with the central axis can preferentially output from the light output through hole 100, thereby ensuring to a certain extent that the light rays output from the light output through hole 100 have better direction consistency.

[0067] In addition, in this embodiment, the inner diameter of the cylindrical cavity 110 can further be equal to an integer multiple of half the wavelength of the excitation light rays output by the light source chip 3. Thus, each light source chip 3 vertically outputs excitation light rays to the fluorescent cylindrical rod 210. When first incident on the fluorescent cylindrical rod 210, only part of the light energy may be absorbed, and the unabsorbed light energy continues to be transmitted in the cylindrical cavity 110 in the form of excitation light rays. Since the inner diameter of the cylindrical cavity 110 is equal to an integer multiple of half the wavelength of the excitation light rays output by the light source chip 3, this part of the excitation light rays can oscillate and reflect repeatedly in the cylindrical cavity 110 in a direction perpendicular to the central axis, thereby achieving energy superposition. When the high-energy excitation light rays formed after superposition are incident on the fluorescent cylindrical rod 210 again, they can have a higher excitation efficiency for the fluorescent cylindrical rod 210, that is, further improve the energy of the fluorescent light rays output by the fluorescent cylindrical rod 210, thereby improving the optical power of the fluorescent beam output by the fluorescent excitation light source.

[0068] On this basis, in this embodiment, a first semi-transmissive and semi-reflective layer 4 can be further disposed on the first end face of the fluorescent cylindrical rod 210, that is, the light-emitting end face. The first semi-transmissive and semi-reflective layer 4 has a transmittance of about 50% for fluorescent light. A reflecting element 5 is disposed at the second end of the fluorescent cylindrical rod 210. The reflectivity of the reflecting element 5 should be as large as possible. As Figure 1 shown, the reflecting element 5 can be fixedly connected to the second end of the cylindrical cavity 110 through a connecting bracket; and the distance between the reflecting element 5 and the first semi-transmissive and semi-reflective layer 4, or the length of the fluorescent cylindrical rod 210, can be an integer multiple of half the wavelength of the fluorescent light. Thus, part of the fluorescent light vertically incident on the first semi-transmissive and semi-reflective layer 4 is partially transmitted and output, and another part can oscillate and superpose repeatedly between the reflecting element 5 and the first semi-transmissive and semi-reflective layer 4 to form fluorescent light with higher energy. The fluorescent light with higher energy is incident on the first semi-transmissive and semi-reflective layer 4 again and then output through the light-emitting through hole 100, so as to realize the output of a fluorescent beam with high optical power.

[0069] Further, referring to Figure 1 , in the fluorescent excitation light source in this embodiment, a condenser lens 6 and a collimating lens 7 can be sequentially disposed on the output optical path of the cylindrical cavity 110; the optical axes of the condenser lens 6 and the collimating lens 7 are collinear with the central axis, so that the fluorescent beam output from the light-emitting through hole 100 is shaped by the condenser lens 6 and the collimating lens 7 to form a beam with high collimation characteristics and high optical power.

[0070] Of course, in practical applications, the output optical path of the cylindrical cavity 110 is not limited to the condenser lens 6 and the collimating lens 7. Specific optical elements can be set based on actual needs, and no specific limitation is made in this application. And when the beam directly output from the cylindrical cavity 110 meets the requirements, other optical elements can also be not set.

[0071] The fluorescent excitation light source with the cylindrical cavity 110 and the fluorescent cylindrical rod 210 in this embodiment can realize the output of a fluorescent beam with high optical power, small spot area and high uniformity of spot brightness; and the diameter of the fluorescent cylindrical rod 210 in this embodiment can be set between 1 mm and 2 mm. Thus, the spot diameter of the fluorescent beam output by the fluorescent excitation light source is in the millimeter range, and it can be applied to medical fields with high requirements for light sources such as fluorescence surgery; it can also be used as a light source required for plant growth experiments.

[0072] In the above embodiments, the example is given with the housing cavity being a cylindrical cavity 110 and the fluorescent stick 21 being a fluorescent cylindrical stick 210. However, it can be understood that when the housing cavity is a non-cylindrical columnar cavity 10 and the fluorescent stick 21 is also a non-cylindrical columnar structure, the setting manner of the light-emitting through hole 100 and the light-emitting end face can refer to the light-emitting through hole 100 on the cylindrical cavity 110 and the light-emitting end face of the fluorescent cylindrical stick 210. In addition, for a columnar cavity 10 of a regular polygon prism cavity (generally a regular polygon prism with an even number of sides), the distance between two opposite inner side faces can also be equal to an integer multiple of half the wavelength of the excitation light output by the light source chip 3, so as to realize the energy superposition of part of the excitation light in the columnar cavity 10, thereby improving the excitation effect on the fluorescent stick 21. And, a first semi-transmissive and semi-reflective layer 4 can also be provided on the first end face (i.e., the light-emitting end face) of the fluorescent stick 21, and a reflective element 5 is provided on the second end face, and the distance between the reflective element 5 and the first semi-transmissive and semi-reflective layer 4 is equal to an integer multiple of half the wavelength of the fluorescence generated by the excitation of the fluorescent stick 21. Similarly, it is to realize the energy superposition of the fluorescent light between the first semi-transmissive and semi-reflective layer 4 and the reflective element 5, thereby realizing the high light power output of the fluorescent beam. This embodiment will not be repeated here. Similarly, a condenser lens 6 and a collimating lens 7 can also be provided on the output light path of the columnar cavity 10. The specific setting manner and principle are similar to those of the embodiment of the cylindrical cavity 110, and will not be elaborated here.

[0073] In the above embodiments, the example is mainly given with the housing cavity being the columnar cavity 10; however, the housing cavity in the present application is not limited to the columnar cavity 10.

[0074] As Figure 3 and Figure 4 shown, in another alternative embodiment of the present application, the fluorescence excitation light source may further include:

[0075] The housing cavity is a partial spherical cavity 12 formed by splicing a spherical shell 1201 and an aspherical shell;

[0076] Each light source chip 3 is arranged on the inner surface of the spherical shell 1201;

[0077] The fluorescent structure is a fluorescent partial sphere 220 with the same shape as the partial spherical cavity 12 and the center of the sphere coinciding with the center of the sphere of the partial spherical cavity 12;

[0078] On the aspherical shell, a light-emitting through hole 100 is opened corresponding to the center region of the partial spherical cavity 12.

[0079] As Figure 3 and Figure 4 shown, the partial spherical cavity 12 in this embodiment can be a small hemispherical cavity or a hemispherical cavity 120.

[0080] As shown in Figure 4 the figure, Figure 4 in the illustrated embodiment, the housing cavity is a hemispherical cavity 120, that is, the housing cavity includes two parts: a hemispherical shell 1201 and a disc-shaped shell 1202 with the same radius. A closed hemispherical cavity 120 can be formed by splicing the hemispherical shell 1201 and the disc-shaped shell 1202 together. Obviously, the center of the hemispherical cavity 120, that is, the center of the hemispherical shell 1201, is also the center of the disc-shaped shell 1202; correspondingly, the fluorescent structure is a fluorescent hemisphere 221, and the center of the fluorescent hemisphere 221 coincides with the center of the disc-shaped shell 1202. On this basis, a light-emitting through hole 100 can be further opened in the central area of the disc-shaped shell 1202. The light-emitting through hole 100 can be a circular through hole with the same size and shape as the planar surface of the fluorescent hemisphere 221. The center of the circular through hole also coincides with the center of the disc-shaped shell 1202. Correspondingly, the planar surface of the fluorescent hemisphere 221 is the light-emitting end face. In addition, each light source chip 3 can be evenly arranged on the inner surface of the hemispherical shell 1201. Obviously, the distances between each light source chip 3 and the fluorescent hemisphere 221 are all the same.

[0081] Thus, when the light source chips 3 emit excitation light from the three-dimensional space region of the hemisphere in a converging manner towards the center region of the hemispherical cavity 120, the fluorescent hemisphere 221 can be excited to the greatest extent, and then the fluorescent hemisphere 221 outputs high-power fluorescent light rays from its planar surface.

[0082] Furthermore, the difference between the radius of the fluorescent hemisphere 221 and the radius of the hemispherical cavity 120 in this embodiment can also be equal to an integer multiple of half the wavelength of the excitation light output by the light source chip 3; thus, when the excitation light is incident on the spherical surface of the fluorescent hemisphere 221, although most of the light can be transmitted, inevitably, there is still some excitation light that is reflected. This part of the reflected excitation light can be incident on the fluorescent hemisphere 221 again after repeatedly oscillating and superposing between the spherical surface of the fluorescent hemisphere 221 and the inner surface of the hemispherical shell 1201, which can also improve the excitation efficiency of the excitation light on the fluorescent hemisphere 221 to a certain extent; on this basis, in this embodiment, a second semi-transparent and semi-reflective layer that can semi-transparently reflect the excitation light (it can be a film layer with a reflectivity of 30% - 50% for the excitation light) can also be provided on the spherical surface of the fluorescent hemisphere 221, so that part of the excitation light oscillates and superposes between the fluorescent hemisphere 221 and the hemispherical shell 1201 to form an excitation light wave with higher energy. When this excitation light wave is incident on the fluorescent hemisphere 221, the excitation efficiency of the fluorescent hemisphere 221 can be greatly improved.

[0083] In another alternative implementation of this embodiment, a structure layer that semi-transmits and semi-reflects fluorescent light may also be provided on the spherical surface of the fluorescent hemisphere 221; at this time, the difference between the radius of the fluorescent hemisphere 221 and the radius of the hemispherical cavity 120 is equal to an integer multiple of half the wavelength of the fluorescent light; thus, after part of the fluorescent light oscillates and superimposes between the fluorescent hemisphere 221 and the hemispherical shell 1201, it is transmitted and output through the fluorescent hemisphere 221, thereby forming a high-power fluorescent beam.

[0084] As Figure 3 shown, in the embodiment shown in Figure 3 the outer shell cavity is a partial spherical cavity 12, specifically a small hemispherical cavity. The so-called small hemispherical cavity is a cavity jointly formed by splicing the edge of a partial spherical shell 121 smaller than a hemispherical surface and the bottom edge of a conical shell 122; among them, the generatrix of the conical shell 122 is equal to the radius of the partial spherical shell 121, and the vertex of the conical shell 122 coincides with the center of the sphere of the partial spherical shell 121; correspondingly, the structural shape of the fluorescent structure is the same as the shape of the partial spherical cavity 12, that is, a fluorescent partial sphere 220, specifically a fluorescent small hemisphere, and the center of the sphere of this fluorescent small hemisphere also coincides with the center of the sphere of the partial spherical shell 121; each light source chip 3 is also arranged on the inner surface of the partial spherical shell 121, so that the distances between each light source chip 3 and the fluorescent partial sphere 220 are the same. Thus, each light source chip 3 also outputs excitation laser to the fluorescent partial sphere 220 together, so that the fluorescent partial sphere 220 outputs a high-power fluorescent beam under the condition of high excitation efficiency.

[0085] On this basis, a small small hemispherical groove 2201 may also be machined in the center region of the fluorescent small hemisphere in this embodiment; the shape of the small hemispherical groove 2201 is the same as that of the fluorescent small hemisphere, and the centers of the spheres coincide; the groove surface of the small hemispherical groove 2201 serves as the light-emitting surface of the fluorescent small hemisphere; and a light-emitting through hole 100 with the same shape as the notch of the small hemispherical groove 2201 is opened at the top of the conical shell 122. Thus, the light-emitting end face of the fluorescent small hemisphere in this embodiment for outputting the fluorescent beam is an inwardly concave spherical surface, which can limit the divergence angle of the output fluorescent beam to a certain extent. And, a first semi-transmissive and semi-reflective layer 4 for semi-transmitting and semi-reflecting fluorescent light may be further provided on the groove surface of the small hemispherical groove 2201. Obviously, the first semi-transmissive and semi-reflective layer 4 is also a small hemispherical film layer structure; on this basis, the radius difference between the small hemispherical groove 2201 and the fluorescent small hemisphere may be equal to an integer multiple of half the wavelength of the fluorescent light, so that part of the fluorescent light oscillates and superimposes in the fluorescent small hemisphere, forming a high-power fluorescent beam output.

[0086] In addition, a second semi-transmissive and semi-reflective layer capable of semi-transmitting and semi-reflecting the excitation light may also be provided on the spherical surface of the fluorescent small hemisphere in this embodiment (i.e., the surface close to a part of the spherical shell 121 and facing away from the center of the sphere), for semi-transmitting and semi-reflecting the excitation light output by the light source chip 3; the difference between the radius of the fluorescent small hemisphere 220 and the radius of the hemispherical cavity 120 is equal to an integer multiple of half the wavelength of the excitation light. Thus, the energy of the excitation light can be improved to a certain extent, and further the excitation efficiency of the fluorescent small hemisphere 220 can be improved, so that the fluorescent small hemisphere can output a fluorescent beam with high optical power.

[0087] Based on the above discussion, in the embodiment where the outer shell cavity is a columnar cavity 10, the light source chips 3 are arranged symmetrically around the fluorescent structure with respect to the central axis, and in the embodiment where the outer shell cavity is a partial spherical cavity 12, the light source chips 3 output the excitation light in a manner of converging and radiating towards the fluorescent structure with the fluorescent structure as the center of the sphere, both of which can greatly improve the excitation efficiency of the fluorescent structure. Of course, other symmetric structural cavities are not excluded in this application, and they are not listed one by one in this application.

[0088] In addition, whether the outer shell cavity in this application is a columnar cavity 10 or a partial spherical cavity 12, when a relatively large number of light source chips 3 are provided on the inner surface of the outer shell cavity, heat will inevitably be generated. In this application, a certain spacing space is left between the light source chip 3 and the fluorescent structure, which can also avoid the problem of excessive heat concentration to a certain extent.

[0089] On this basis, in order to further dissipate heat from the optical elements in the outer shell cavity, a radiator 8 can be further attached to the outer surface of the outer shell cavity, especially on the outer surface of the cavity wall where the light source chip 3 is provided on the inner surface of the outer shell cavity.

[0090] In summary, the light source device provided in the present application uses a light source chip as an excitation light source to output excitation light to the fluorescent structure, so that the fluorescent structure is excited to generate fluorescent light. On this basis, in order to achieve high light power output in the present application, the fluorescent structure and the light source chip are jointly arranged in the outer shell cavity. By using the axisymmetric structure of the outer shell cavity, each light source chip can be distributed around the fluorescent structure as the center, so that each light source chip can fully excite the fluorescent structure from multiple different angles. At the same time, part of the excitation light output by the light source chip can be efficiently absorbed and utilized by the fluorescent structure after being repeatedly reflected in the outer shell cavity. Thus, the excitation efficiency of the fluorescent structure is maximally improved, and finally, a high light power beam can be output from the light output through hole of the outer shell cavity. And because the finally output beam is output after the fluorescent structure is excited, therefore, in the present application, a suitable fluorescent material can be selected based on actual needs to form the fluorescent structure, so as to obtain light waves in the required wavelength band, and there is no limitation in wavelength. It can be seen that in the present application, high light power output of light beams in a wider wavelength band range can be achieved, and it can be widely applied to various different industries.

[0091] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes the inherent elements thereof. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. In addition, the parts of the above technical solutions provided in the embodiments of the present application that are the same as the corresponding technical solutions in the prior art in terms of implementation principles are not described in detail to avoid excessive elaboration.

[0092] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A fluorescence excitation light source, characterized in that, Comprising: A housing cavity with a symmetric structure having a central axis; A fluorescent structure disposed on the central axis; A plurality of light source chips built in different orientations on the inner surface of the housing cavity and symmetrically arranged with the position of the fluorescent structure as the center; Light-emitting through holes are provided on the housing cavity symmetrically about the central axis and in a plane perpendicular to the central axis; The fluorescent structure has a light-emitting end face covering the area where the light-emitting through hole is located, and the fluorescent light waves generated by the fluorescent structure excited by each light source chip are output through the light-emitting end face and the light-emitting through hole.

2. The fluorescence excitation light source according to claim 1, characterized in that, The housing cavity is a columnar cavity; the fluorescent structure is a fluorescent rod disposed on the central axis and parallel to the central axis in the length direction; The light source chips are evenly and symmetrically arranged around the fluorescent rod on the inner side wall of the columnar cavity; The light-emitting through hole is located on the first end face of the columnar cavity and has the same cross-sectional shape as the fluorescent rod; Wherein, the inner radius of the housing cavity is an integer multiple of the wavelength of the light wave output by the light source chip.

3. The fluorescent excitation light source according to claim 2, wherein The housing cavity is a cylindrical cavity; the fluorescent structure is a fluorescent cylindrical rod.

4. The fluorescence excitation light source according to claim 2, wherein A reflecting element is further connected to the inner surface of the second end face of the housing cavity; The end face of the first end of the fluorescent rod is the light-emitting end face; the second end of the fluorescent rod is attached to the reflecting element; a first semi-transmissive and semi-reflective layer is attached to the first end of the fluorescent rod for semi-transmissive and semi-reflective transmission of the fluorescent light output by the fluorescent rod. The distance between the reflecting element and the first semi-transmissive and semi-reflective layer is equal to an integer multiple of half the wavelength of the fluorescent light.

5. The fluorescence excitation light source according to claim 1, characterized in that, The housing cavity is a partial spherical cavity formed by splicing a spherical shell and an aspherical shell; Each light source chip is disposed on the inner surface of the spherical shell; The fluorescent structure is a fluorescent partial sphere having the same shape as the partial spherical cavity and the center of the sphere coinciding with the center of the sphere of the partial spherical cavity; On the aspherical shell, the light-emitting through hole is opened corresponding to the center region of the partial spherical cavity.

6. The fluorescence excitation light source according to claim 5, wherein The housing cavity includes a hemispherical shell and a circular disc shell with the same radius; the hemispherical shell and the circular shell are spliced with each other to form a hemispherical cavity; The fluorescent structure is a fluorescent hemisphere disposed at the center of the circular disc shell; The light-emitting through hole is a circular through hole located at the center of the circular disc shell and having the same radius as the fluorescent hemisphere; The planar surface of the fluorescent hemisphere is the light-emitting end face.

7. The fluorescence excitation light source according to claim 6, characterized in that, A second semi-transmissive and semi-reflective layer is further provided on the spherical surface of the fluorescent hemisphere for semi-transmissive and semi-reflective transmission of the excitation light output by the light source chip; The difference between the radius of the fluorescent hemisphere and the radius of the hemispherical cavity is equal to an integer multiple of half the wavelength of the excitation light.

8. The fluorescence excitation light source according to any one of claims 1 to 7, characterized in that, A radiator is further attached to the outer surface of the housing cavity.

9. The fluorescence excitation light source according to claim 8, wherein A condenser lens and a collimating lens are further provided outside the housing cavity opposite to the light-emitting through hole.

10. The fluorescence excitation light source according to claim 8, wherein, The light source chip is a blue LED chip or a laser chip; The wavelength of the fluorescent light output by the excitation of the fluorescent structure is 460nm to 650nm.

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