Light source device

Abstract

To stably support a wavelength conversion member in a light source device including the wavelength conversion member without bonding a support member to a package.SOLUTION: A light source device comprises: an excitation light source; a package which houses the excitation light source; a heat radiation member which is arranged at an end of the package in contact with an outer surface of the package; a support member which is made of a material having transmissivity to excitation light emitted by the excitation light source, and arranged in contact with the heat radiation member in a non-bonding state; a wavelength conversion member which is arranged fixedly to the support member, and receives the excitation light to emit fluorescent light; and a cover member which is arranged so as to cover a principal surface of the support member, wherein the heat radiation member has an opening region at least in part on the optical path of the excitation light, and the package and cover member are threadedly fitted together.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light source device, and more particularly to a light source device in which light emitted from a semiconductor laser element is wavelength-converted by a wavelength conversion member and then emitted. [Background technology]

[0002] A light source device including an excitation light source and a wavelength conversion member has been known. When excitation light emitted from the excitation light source is irradiated onto the wavelength conversion member, the wavelength conversion member emits fluorescence having a wavelength different from that of the excitation light.

[0003] 16 is a schematic cross-sectional view of a light source device disclosed in Patent Document 1. A light source device 90 includes an excitation light source 92, a wavelength conversion member 95, and a light-transmitting member 94. The excitation light source 92 and the light-transmitting member 94 are housed inside a package 91. The light-transmitting member 94 supports the wavelength conversion member 95 and dissipates heat.

[0004] Excitation light L92 emitted from the excitation light source 92 is reflected by a mirror 93, passes through a light-transmitting member 94, and is then incident on a wavelength conversion member 95. The excitation light L92 is wavelength-converted by the wavelength conversion member 95 and extracted as fluorescence L95.

[0005] 16, a light reflecting member 96 is disposed on the side of a wavelength converting member 95 in order to increase the amount of extracted light of fluorescent light L95. Also, a high thermal conductivity member 97 is disposed in order to suppress a temperature rise in the wavelength converting member 95. The high thermal conductivity member 97 is adhered to the package 91 via an adhesive 99. The light transmitting member 94, together with the high thermal conductivity member 97, has the function of dissipating heat generated in the wavelength converting member 95. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7356311 Summary of the Invention [Problem to be solved by the invention]

[0007] 16, the light-transmitting member 94 is bonded to the package 91 via an adhesive 98 made of solder or the like. That is, when manufacturing the light source device 90, the work of applying the adhesive 98 such as solder is required, and time must be secured for the adhesive 98 to harden, resulting in a problem of low work efficiency.

[0008] Furthermore, during use of the light source device 90, dirt may adhere to the surface of the light-transmitting member 94. However, because the light-transmitting member 94 is adhered to the package 91, it is difficult to remove and clean only the light-transmitting member 94. For this reason, in the light source device 90, the extraction efficiency of the fluorescent light L95 may decrease early.

[0009] In view of the above problems, the present invention aims to provide a light source device that includes a wavelength conversion member and that makes it possible to stably support the wavelength conversion member without adhering the support member to a package. [Means for solving the problem]

[0010] The light source device according to the present invention comprises: an excitation light source including a semiconductor laser element; a package that houses the excitation light source; a heat dissipation member disposed in contact with an outer surface of the package at an end of the package in a first direction in which the excitation light emitted from the excitation light source travels; a support member made of a material that is transparent to the excitation light emitted from the excitation light source, the support member being arranged in contact with the heat dissipation member in a non-adhesive manner; a wavelength conversion member fixed to the support member, which receives the excitation light and emits fluorescence; a cover member arranged to cover a main surface of the support member in the first direction, the heat dissipation member has an opening region in at least a part of the optical path of the excitation light, The package and the cover member are fitted together by a screw action.

[0011] According to the above configuration, the cover member and the package are fitted together by screwing, so that the cover member is pressed against the support member or the wavelength conversion member. Since the heat dissipation member is arranged in contact with the support member, when the cover member is screwed to the package, the heat dissipation member is pressed against the outer surface of the package by the cover member. As a result, the heat dissipation member is in surface contact with the support member, and high heat dissipation performance is achieved.

[0012] The cover member and the package are fitted together by screwing, so that the support member is stably held between the cover member and the package. In other words, with the above configuration, the support member can be stably held without adhesively fixing the support member to the package, so that the wavelength conversion member fixed to the support member can also be stably held. Furthermore, because the support member can be easily removed from the package, the surface of the support member can be easily cleaned.

[0013] The heat dissipation member can be realized by at least one of a heat dissipation sheet and heat dissipation grease.

[0014] The package has a body and a protrusion protruding from the body in the first direction, the cover member is composed of a bottomed tubular body including a base portion located at an end in the first direction and including a main surface, and an annular fitting portion formed continuously with the base portion in a direction approaching the excitation light source and including a fitting hole on the inside, an outer wall of the protrusion of the package and an inner wall of the fitting hole of the fitting portion of the cover member are each threaded; The inner bottom surface of the fitting hole may be in contact with at least one of the support member and the wavelength converting member.

[0015] the protrusion of the package has a first recess formed at an end in the first direction in a direction approaching the excitation light source, the heat dissipation member is disposed on an inner bottom surface of the first recess, At least a portion of the support member may be located within the first recess.

[0016] the protruding portion of the package includes a first protruding portion located at a tip end in the first direction, and a second protruding portion protruding from the body portion in the first direction to connect the body portion and the first protruding portion, the fitting hole formed in the fitting portion of the cover member includes a first fitting hole formed on a side closer to the base portion, and a second fitting hole that is connected to a side closer to the excitation light source than the first fitting hole and has a larger opening area than the first fitting hole, an outer wall of the first protrusion of the package and an inner wall of the first fitting hole formed in the fitting portion of the cover member are each threaded; An outer wall of the second protrusion of the package may be in contact with an inner wall of the second fitting hole formed in the fitting portion of the cover member.

[0017] According to the above configuration, the package and the cover member come into contact at a location other than the location where they are screwed together. Specifically, the screw can be tightened by the outer wall of the first protrusion of the package and the inner wall of the first fitting hole formed in the fitting portion of the cover member while the outer wall of the second protrusion of the package comes into contact with the inner wall of the second fitting hole formed in the fitting portion of the cover member. This reduces the likelihood of axial misalignment during the screw tightening process. In other words, the package and the cover member can be more stably held in the desired position.

[0018] In another aspect, the protruding portion of the package includes a first protruding portion located at a tip end in the first direction, and a second protruding portion protruding from the body portion in the first direction to connect the body portion and the first protruding portion, the fitting hole formed in the fitting portion of the cover member includes a first fitting hole formed on a side closer to the base portion, and a second fitting hole that is connected to a side closer to the excitation light source than the first fitting hole and has a larger opening area than the first fitting hole, an outer wall of the second protrusion of the package and an inner wall of the second fitting hole formed in the fitting portion of the cover member are each threaded; An outer wall of the first protrusion of the package may be in contact with an inner wall of the first fitting hole formed in the fitting portion of the cover member.

[0019] Even with this configuration, the package and the cover member contact each other at a location other than the location where they are screwed together. Specifically, the outer wall of the first protrusion of the package contacts the inner wall of the first fitting hole formed in the fitting portion of the cover member, and the screw can be fastened between the outer wall of the second protrusion of the package and the inner wall of the second fitting hole formed in the fitting portion of the cover member. This reduces the likelihood of axial misalignment during the screw fastening process. In other words, the package and the cover member can be held more stably in the desired position.

[0020] the light source device includes a light-transmitting member that exhibits transparency to the fluorescent light, the base portion of the cover member has a second recess formed in a region of the main surface facing the wavelength conversion member in the first direction, from the main surface toward the fitting portion, The light-transmitting member may be disposed in the second recess.

[0021] As one example, the light-transmitting member may be a cover glass provided for the purpose of preventing dirt or moisture from entering. As another example, the light-transmitting member may be an optical member such as a lens provided for the purpose of controlling the traveling direction of light.

[0022] As described above, in the optical device having the above structure, the package and the cover member are fixed together by screwing. Therefore, if a second recess is formed in the cover member in advance so that the optical axis is positioned at the center, and an optical member serving as a light-transmitting member is placed in this second recess, the optical member can be easily positioned in an appropriate position by screwing the package and the cover member together.

[0023] The light source device may further include an optical system disposed at least one of inside and outside the cover member at a position farther away in the first direction than the wavelength conversion member. [Effects of the Invention]

[0024] According to the light source device of the present invention, the wavelength conversion member can be stably supported without bonding a support member for supporting the wavelength conversion member to the package. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view schematically illustrating a configuration of an embodiment of a light source device. [Figure 2] FIG. 2 is a schematic exploded perspective view of the light source device shown in FIG. [Figure 3] FIG. 2 is a schematic cross-sectional view of the light source device shown in FIG. [Figure 4] 10A and 10B are cross-sectional views schematically illustrating an example of an arrangement of a wavelength conversion member and a support member. [Figure 5] 4 is a schematic enlarged view of a part of a phosphor layer provided on a wavelength conversion member. [Figure 6] FIG. 2 is a schematic perspective view showing a state in which only a cover member is removed from FIG. [Figure 7] FIG. 7 is a schematic cross-sectional view of the light source device in the state shown in FIG. 6. [Figure 8] 8 is a diagram in which some elements are omitted from FIG. 7. [Figure 9] FIG. 10 is a cross-sectional view schematically showing a state in which the support member is disposed in a first recess. [Figure 10]FIG. 3 is a schematic exploded perspective view showing the configuration of another embodiment of the light source device, following the example of FIG. 2. [Figure 11A] FIG. 4 is a schematic cross-sectional view showing the configuration of another embodiment of the light source device of the present invention, following the example of FIG. 3. [Figure 11B] 11B is a schematic cross-sectional view showing a state in which only the cover member is removed from FIG. 11A. FIG. [Figure 12] FIG. 10 is a perspective view schematically illustrating the configuration of another embodiment of a light source device. [Figure 13] FIG. 13 is a schematic cross-sectional view of the light source device shown in FIG. [Figure 14] FIG. 10 is a perspective view schematically illustrating the configuration of another embodiment of a light source device. [Figure 15] FIG. 15 is a schematic cross-sectional view of the light source device shown in FIG. [Figure 16] FIG. 10 is a schematic cross-sectional view of a conventional light source device. DETAILED DESCRIPTION OF THE INVENTION

[0026] The following description will discuss embodiments of the light source device of the present invention with reference to the accompanying drawings. Note that in the following drawings, the dimensional ratios shown in the drawings do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match.

[0027] Fig. 1 is a perspective view schematically showing the configuration of an embodiment of a light source device, Fig. 2 is a schematic exploded perspective view of the light source device shown in Fig. 1, and Fig. 3 is a schematic cross-sectional view of the light source device shown in Fig. 1.

[0028] The light source device 1 shown in FIGS. 1 to 3 includes an excitation light source 31, a package 10 that houses the excitation light source 31, and a cover member 20 that is arranged to cover an end of the package 10.

[0029] 2 and 3, the light source device 1 further includes a heat dissipation member 3, a support member 4, a wavelength conversion member 5, and a light-transmitting member 29. The light source device 1 also includes a base member 30 for fixing the excitation light source 31, as necessary.

[0030] The excitation light source 31 includes a semiconductor laser element and emits excitation light toward the wavelength conversion member 5 (in the direction d1). The wavelength conversion member 5 includes a phosphor 5a, as will be described later with reference to FIG. 5, and when the phosphor 5a is excited by the excitation light, it emits fluorescence having a wavelength different from that of the excitation light. Emitted light L1, in which the excitation light and fluorescence are superimposed, is extracted from the light source device 1. The direction d1 corresponds to the "first direction."

[0031] The wavelength of the excitation light emitted from the excitation light source 31 is not limited as long as it is a wavelength that can excite the phosphor 5a contained in the wavelength conversion member 5. However, when the light source device 1 is intended to generate white emission light L1, the wavelength of the excitation light is preferably in the blue or violet region. In this specification, blue light refers to light in the wavelength region of 420 nm to 500 nm, and violet light refers to light in the wavelength region of 370 nm to 420 nm. As a specific example, the excitation light source 31 includes a semiconductor laser element that emits light in the blue region with a wavelength of 445 nm to 465 nm. The excitation light source 31 may include a collimating optical system as needed.

[0032] As illustrated in FIG. 3, an internal optical system 33 such as a focusing optical system may be disposed between the excitation light source 31 and the wavelength conversion member 5.

[0033] In FIG. 2, the support member 4 and the wavelength conversion member 5 are shown separately for ease of understanding. However, in reality, the wavelength conversion member 5 is fixed to the support member 4. The support member 4 is a member for supporting the wavelength conversion member 5, and is made of a material that is transparent to the excitation light emitted from the excitation light source 31. FIG. 4 is a cross-sectional view that schematically shows an example of an arrangement of the support member 4 and the wavelength conversion member 5. In the example shown in FIG. 4, an antireflection layer 6a is arranged on the surface of the support member 4 facing the excitation light source 31, and a dichroic layer 6b is arranged on the surface of the support member 4 facing the wavelength conversion member 5. However, it is optional whether the light source device 1 includes the antireflection layer 6a. It is also optional whether the light source device 1 includes the dichroic layer 6b.

[0034] The support member 4 is provided for the purposes of stably holding the wavelength conversion member 5, dissipating heat generated by the wavelength conversion member 5, and guiding the excitation light emitted from the excitation light source 31 to the wavelength conversion member 5. From these points of view, a material having a relatively high thermal conductivity and a high transmittance to the excitation light is adopted as the support member 4. Examples of such materials include sapphire and diamond. The thickness of the support member 4 is, for example, 0.5 mm to 5 mm.

[0035] The wavelength conversion member 5 has a flat plate-like structure. The thickness of the wavelength conversion member 5 is preferably 5 μm to 30 μm, more preferably 10 μm to 25 μm, and particularly preferably 15 μm to 22 μm. Fig. 5 is a schematic cross-sectional view showing the structure of the wavelength conversion member 5 in detail. In the example shown in Fig. 5, the wavelength conversion member 5 includes phosphor 5a, binder 5b, and pores 5c.

[0036] The phosphor 5a is an oxide phosphor or nitride phosphor activated with one or more materials such as Ce and Eu. As a specific example, one or more phosphors selected from the group consisting of LSN phosphor, YAG phosphor, and LuAG phosphor can be used as the yellow to green phosphor. As the phosphor 5a, a red phosphor may be mixed with the yellow to green phosphor. As the red phosphor, one or more phosphors selected from the group consisting of CASN phosphor, SCASN phosphor, and CASON phosphor can be used.

[0037] By mixing multiple phosphor materials as the phosphor 5a contained in the wavelength conversion member 5, white light with high color rendering properties is realized by the emitted light L1, which is a superimposed light of the fluorescence generated in the wavelength conversion member 5 and the excitation light.

[0038] In the example shown in FIG. 4, a dichroic layer 6b is provided between the support member 4 and the wavelength conversion member 5. The dichroic layer 6b is made of a material that substantially reflects the fluorescence generated by the wavelength conversion member 5 and substantially transmits the excitation light emitted from the excitation light source 31. The dichroic layer 6b has the function of guiding the incident excitation light to the wavelength conversion member 5, while reflecting the fluorescence generated by the wavelength conversion member 5 that travels toward the support member 4 and returning it to the light extraction surface. Here, "substantially reflect" means that the reflectance is 80% or more, and "substantially transmit" means that the transmittance is 80% or more.

[0039] The dichroic layer 6b is realized by, for example, laminating a plurality of dielectric films having different refractive indices.

[0040] 4, an antireflection layer 6a is provided on the surface of the support member 4 opposite to the wavelength conversion member 5. The antireflection layer 6a is provided for the purpose of suppressing the excitation light emitted from the excitation light source 31 toward the wavelength conversion member 5 from being reflected by the surface of the support member 4 toward the excitation light source 31. This makes it possible to efficiently guide the excitation light to the wavelength conversion member 5.

[0041] A general-purpose AR coating layer can be used as the antireflection layer 6a. The antireflection layer 6a may have a function of substantially transmitting the excitation light emitted from the excitation light source 31 toward the wavelength conversion member 5.

[0042] Fig. 6 is a schematic perspective view showing a state in which the cover member 20 is removed from the package 10. Fig. 7 is a schematic cross-sectional view of the light source device 1 in the state shown in Fig. 6. Fig. 8 is a drawing in which some elements are omitted from Fig. 7 for convenience of explanation.

[0043] 6 to 8, package 10 has body 11 and protrusion 12. Protrusion 12 has a shape that protrudes from body 11 in direction d1 in a region inside the outer edge of body 11.

[0044] As shown in FIG. 7 , the cover member 20 has a base portion 21 located at an end in the direction d1 and including a main surface 21a, and a fitting portion 22 located closer to the package 10 than the base portion 21 and including a fitting hole (fitting hole 51) therein. The base portion 21 and the fitting portion 22 are formed continuously. The fitting portion 22 is configured as a bottomed tubular body. More specifically, the fitting portion 22 is formed continuously with respect to the base portion 21 in a direction approaching the excitation light source 31 (direction approaching the package 10), and has an annular shape including the fitting hole 51 on the inside. The fitting hole 51 has an inner bottom surface 53 configured from a part of the base portion 21.

[0045] Threads are formed on the outer wall 41 of the protruding portion 12 of the package 10 and the inner wall 61 of the fitting hole 51 of the fitting portion 22 of the cover member 20. In other words, by screwing the outer wall 41 of the protruding portion 12 of the package 10 and the inner wall 61 of the fitting portion 22 of the cover member 20 together while they are in contact with each other, the package 10 and the cover member 20 are fitted together by the screw action.

[0046] As shown in Fig. 8, the protrusion 12 of the package 10 has a first recess 15 formed at the end in the direction d1 in a direction approaching the excitation light source 31. The heat dissipation member 3 is disposed on the inner bottom surface 15a of this first recess 15 (see also Fig. 3). The heat dissipation member 3 is made of at least one of a heat dissipation sheet and heat dissipation grease.

[0047] 2 and 3, the heat dissipation member 3 has an opening region 3a at least in a part of the optical path of the excitation light. The excitation light emitted from the excitation light source 31 passes through the opening region 3a of the heat dissipation member 3, passes through the support member 4, and then enters the wavelength conversion member 5.

[0048] 3 and 8, at least a portion of the support member 4 is located within the first recess 15. As described above, the wavelength conversion member 5 is fixed to the support member 4.

[0049] 2, a second recess 28 is formed in a part of the main surface of the end portion of the cover member 20 in the direction d1. This second recess 28 is formed in a region facing the wavelength conversion member 5 in the direction d1. A light-transmitting member 29 is disposed so as to be fitted into this second recess 28. The light-transmitting member 29 is, for example, a cover glass, a lens, or the like.

[0050] The light source device 1 is mounted, for example, in the following procedure. First, the heat dissipation member 3 is placed so as to be in contact with the outer surface of the package 10; more specifically, on the inner bottom surface 15a of the first recess 15 formed in the protruding portion 12 of the package 10 (see FIGS. 3 and 8). Next, the support member 4 to which the wavelength conversion member 5 is fixed is placed so as to be in contact with the upper surface of the heat dissipation member 3. In other words, the support member 4 is in contact with the heat dissipation member 3 in a non-adhesive state. At this time, as described above, at least a portion of the support member 4 is located within the first recess 15 formed in the protruding portion 12 of the package 10.

[0051] At this point, the support member 4 is simply placed on the surface of the heat dissipation member 3 and is not fixed to the package 10.

[0052] Specifically, when the support member 4 is placed in the first recess 15, the main surface 4a of the support member 4 protrudes in the direction d1 beyond the end surface 13 of the protrusion 12 of the package 10 (see reference symbol 4d), as shown in Fig. 9. For example, the depth of the first recess 15 is designed to be shorter than the total value of the thickness of the heat dissipation member 3 and the thickness of the support member 4. For convenience of explanation, Fig. 9 is illustrated with some dimensional proportions exaggerated compared to the enlarged view in Fig. 3.

[0053] Next, the cover member 20 is screwed onto the package 10. More specifically, as described above with reference to FIG. 7 , the outer wall 41 of the protrusion 12 of the package 10 is brought into contact with the inner wall 61 of the fitting hole 51 provided in the fitting portion 22 of the cover member 20, and the screwing is performed. As a result, with the inner bottom surface 53 of the fitting hole 51 of the cover member 20 in contact with the support member 4 or the wavelength conversion member 5, an external force is applied from the cover member 20 toward the package 10, and the support member 4 is fixed so as to be sandwiched between the cover member 20 and the package 10. Furthermore, the application of the external force brings the support member 4 and the heat dissipation member 3 into surface contact, and heat generated in the wavelength conversion member 5 is dissipated to the heat dissipation member 3 side via the support member 4 with high efficiency.

[0054] That is, according to the light source device 1, it is possible to stably fix the support member 4 to the package 10 without adhesively fixing the support member 4 to the package 10. Furthermore, since the support member 4 can be easily removed by simply loosening the screws between the cover member 20 and the package 10, the support member 4 can be easily cleaned.

[0055] [Another embodiment] Another embodiment of the light source device 1 will be described below.

[0056] <1> The light source device 1 shown in FIG. 2 has a shape in which the outer edge of the wavelength conversion member 5 is located more inward than the outer edge of the support member 4. As a more detailed example, the support member 4 is rectangular, and the wavelength conversion member 5 is circular and smaller than the support member 4 and located more inward than the support member 4. In contrast, as shown in FIG. 10 , the size of the wavelength conversion member 5 when viewed in direction d1 may be substantially the same as the size of the support member 4. In this case, when the cover member 20 is screwed onto the package 10, the inner bottom surface 53 (see FIG. 7 ) of the fitting hole 51 of the fitting portion 22 of the cover member 20 comes into contact with the main surface of the wavelength conversion member 5.

[0057] 11A and 11B, the package 10 and the cover member 20 may be in contact with each other at two or more different locations. Fig. 11A is a schematic cross-sectional view showing the configuration of another embodiment of the light source device 1 in accordance with Fig. 3, and Fig. 11B is a schematic cross-sectional view showing the light source device 1 shown in Fig. 11B with the cover member 20 removed from the package 10.

[0058] In this alternative embodiment, the protrusion 12 of the package 10 has a first protrusion 12a and a second protrusion 12b that connects the body 11 and the first protrusion 12a in the direction d1. The first protrusion 12a is located at the tip of the protrusion 12 in the direction d1 and protrudes in the direction d1 from the second protrusion 12b in a region that is more inward than the outer edge of the second protrusion 12b. The second protrusion 12b protrudes in the direction d1 from the body 11 in a region that is more outward than the outer edge of the first protrusion 12a and more inward than the outer edge of the body 11 in the direction d1, connecting the body 11 and the first protrusion 12a. That is, the package 10 has two steps at two locations, the second protrusion 12b and the first protrusion 12a, at the end position in the direction d1 from the body 11 toward the direction d1. Further, an outer wall 41a of the first protruding portion 12a of the package 10 and an inner wall 61a of the first fitting hole 51a formed in the fitting portion 22 of the cover member 20 are each threaded.

[0059] The fitting hole 51 formed in the fitting portion 22 of the cover member 20 has a first fitting hole 51a formed on a side closer to the base portion 21, and a second fitting hole 51b that communicates with the first fitting hole 51a on a side closer to the excitation light source 31 (a side farther from the base portion 21) than the first fitting hole 51a. The second fitting hole 51b has a larger opening area than the first fitting hole 51a.

[0060] In the light source device 1 illustrated in FIGS. 11A and 11B, when the cover member 20 is attached to the package 10, the outer wall 41b of the second protrusion 12b of the package 10 comes into contact with the inner wall 61b of the second fitting hole 51b formed in the fitting portion 22 of the cover member 20. In this state, the outer wall 41a of the first protrusion 12a of the package 10 comes into contact with the inner wall 61a of the first fitting hole 51a formed in the fitting portion 22 of the cover member 20, and the screws are tightened. As a result, the cover member 20 and the package 10 can be tightened with the two members in contact at a location different from the location where the screws are tightened, which makes it less likely that the cover member 20 will be misaligned with respect to the package 10 during the tightening operation. In particular, when a light-transmitting member 29 formed of a lens is provided inside the cover member 20, this has the effect of eliminating the need for a separate optical axis adjustment operation.

[0061] 11B, the outer wall 41b of the second protruding portion 12b of the package 10 and the inner wall 61b of the second fitting hole 51b formed in the fitting portion 22 of the cover member 20 may be threaded. In this case, when the cover member 20 is attached to the package 10, the outer wall 41a of the first protruding portion 12a of the package 10 comes into contact with the inner wall 61a of the first fitting hole 51a formed in the fitting portion 22 of the cover member 20. In this state, the outer wall 41b of the second protruding portion 12b of the package 10 comes into contact with the inner wall 61b of the second fitting hole 51b formed in the fitting portion 22 of the cover member 20, and the screws are fastened.

[0062] In the light source device 1 shown in Figures 11A to 11B, the protrusion 12 has two steps (first protrusion 12a, second protrusion 12b) and the fitting hole 51 has two steps (first fitting hole 51a, second fitting hole 51b), but the number of steps may be three or more.

[0063] <3> In each of the above embodiments, the package 10 of the light source device 1 is configured such that the outer edge of the protrusion 12 is located more inward than the outer edge of the body 11 when viewed from the direction d1. However, the protrusion 12 may protrude from the body 11 in the direction d1 while being shaped so that the outer edge of the protrusion 12 is more outward than the outer edge of the body 11. For example, as in the light source device 1 shown in FIGS. 11A and 11B , when the protrusion 12 has multiple steps (first protrusion 12a, second protrusion 12b, ...), the outer edges of at least some of the step portions included in the protrusion 12 may be shaped so that they are more outward than the outer edge of the body 11.

[0064] 12 and 13, an optical system 71 such as a lens may be disposed inside the cover member 20. Fig. 12 is a schematic perspective view of a light source device 1 according to this alternative embodiment, and Fig. 13 is a schematic cross-sectional view of the light source device 1 shown in Fig. 12.

[0065] <5> As shown in Figures 14 and 15, an optical system 72 such as a concave reflecting mirror may be disposed after the cover member 20. Figure 14 is a schematic perspective view of a light source device 1 according to this alternative embodiment, and Figure 15 is a schematic cross-sectional view of the light source device 1 shown in Figure 14.

[0066] <6> The light source devices 1 according to the other embodiments described above with reference to FIGS. 9 to 15 can be combined as appropriate.

[0067] <7> The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to provide a better understanding of the present invention, and the present invention is not necessarily limited to those having all of the configurations described. The scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0068] 1:Light source device 3: Heat dissipation material 3a:Aperture area 4: Support member 4a: Main surface of support member 5: Wavelength conversion material 5a: Phosphor 5b: Binder 5c: Stoma 6a: Anti-reflection layer 6b: Dichroic layer 10: Package 11: Torso 12:Protrusion 12a: First protrusion 12b: Second protrusion 13: End face of protrusion 15: First recess 15a: inner bottom surface of first recess 20: Cover member 21: Basal part 21a: Main surface of the base 22:Mating part 28: Second recess 29: Light-transmitting member 30: Base material 31: Excitation light source 33: Internal optical system 41: Outer wall of protrusion 41a: outer wall of the first protrusion 41b: outer wall of second protrusion 51: Fitting hole 51a: First fitting hole 51b:Second fitting hole 53: Inner bottom surface of fitting hole 61: Inner wall of fitting hole 61a: Inner wall of first fitting hole 61b: Inner wall of second fitting hole 71:Optical system 72:Optical system 90:Light source device 91: Package 92: Excitation light source 93: Mirror 94: Light-transmitting material 95: Wavelength conversion material 96: Light reflecting material 97: High thermal conductivity material 98:Adhesive 99:Adhesive L1: Output light L92: Excitation light L95: Fluorescence d1: first direction

Claims

1. an excitation light source including a semiconductor laser element; a package that houses the excitation light source; a heat dissipation member disposed in contact with an outer surface of the package at an end of the package in a first direction in which the excitation light emitted from the excitation light source travels; a support member made of a material that is transparent to the excitation light and disposed in contact with the heat dissipation member in a non-adhesive manner; a wavelength conversion member fixed to the support member, which receives the excitation light and emits fluorescence; a cover member arranged to cover a main surface of the support member in the first direction, the heat dissipation member has an opening region in at least a part of the optical path of the excitation light, The light source device is characterized in that the package and the cover member are fitted together by a screw action.

2. The package has a body portion and a protrusion portion protruding from the body portion in the first direction with respect to the first direction, the cover member is composed of a bottomed tubular body including a base portion located at an end in the first direction and including a main surface, and an annular fitting portion formed continuously with the base portion in a direction approaching the excitation light source and including a fitting hole on the inside, an outer wall of the protrusion of the package and an inner wall of the fitting hole of the fitting portion of the cover member are each threaded; 2. The light source device according to claim 1, wherein an inner bottom surface of the fitting hole is in contact with at least one of the support member and the wavelength conversion member.

3. the protrusion of the package has a first recess formed at an end in the first direction in a direction approaching the excitation light source, the heat dissipation member is disposed on an inner bottom surface of the first recess, The light source device according to claim 2 , wherein at least a portion of the support member is located within the first recess.

4. the protruding portion of the package includes a first protruding portion located at a tip end in the first direction, and a second protruding portion protruding from the body portion in the first direction to connect the body portion and the first protruding portion, the fitting hole formed in the fitting portion of the cover member includes a first fitting hole formed on a side closer to the base portion, and a second fitting hole that is connected to a side closer to the excitation light source than the first fitting hole and has a larger opening area than the first fitting hole, an outer wall of the first protrusion of the package and an inner wall of the first fitting hole formed in the fitting portion of the cover member are each threaded; 4. The light source device according to claim 2, wherein an outer wall of the second protrusion of the package contacts an inner wall of the second fitting hole formed in the fitting portion of the cover member.

5. the protruding portion of the package includes a first protruding portion located at a tip end in the first direction, and a second protruding portion protruding from the body portion in the first direction to connect the body portion and the first protruding portion, the fitting hole formed in the fitting portion of the cover member includes a first fitting hole formed on a side closer to the base portion, and a second fitting hole that is connected to a side closer to the excitation light source than the first fitting hole and has a larger opening area than the first fitting hole, an outer wall of the second protrusion of the package and an inner wall of the second fitting hole formed in the fitting portion of the cover member are each threaded; 4. The light source device according to claim 2, wherein an outer wall of the first protrusion of the package contacts an inner wall of the first fitting hole formed in the fitting portion of the cover member.

6. a light-transmitting member that is transparent to the fluorescent light; the base portion of the cover member has a second recess formed in a region of the main surface facing the wavelength conversion member in the first direction, from the main surface toward the fitting portion, The light source device according to claim 2 or 3, wherein the light-transmitting member is disposed in the second recess.

7. 7. The light source device according to claim 6, wherein the light transmitting member is a lens.

8. 3. The light source device according to claim 1, further comprising an optical system disposed inside the cover member and / or outside the cover member at a position farther away in the first direction than the wavelength conversion member.

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