Light source device, headlamp, display device, and lighting device

Abstract

[Problem] To provide a light source device, a headlamp, a display device, and a lighting device having excellent heat dissipation. [Solution] A light source device includes a substrate, a phosphor, a light emitting element, and a wavelength-selective reflection member. The phosphor is disposed in contact with the substrate. The light emitting element emits excitation light that excites the phosphor. The wavelength-selective reflection member partially reflects the excitation light emitted from the light emitting element to guide the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor due to excitation caused by incidence of the excitation light, and the excitation light reflected by the phosphor.

Description

Technical Field

[0001] This technology relates to light source devices suitable for headlights, display devices, etc. Background Technology

[0002] Patent Document 1 describes a light source device including a prism-type phosphor having a reflective surface that serves as a mirror for reflecting light incident from a blue laser device and changing the direction of the light. In this light source device, the prism-type phosphor is attached to a holding member disposed on a base member. One side of the holding member is in contact with the reflective surface of the prism-type phosphor, and the other side is in contact with the base member.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-254889 Summary of the Invention

[0006] Technical issues

[0007] In the light source device described in Patent Document 1, the heat generated when light is incident and the prism-type phosphor is excited by fluorescence is radiated to the base member through the reflective surface and the holding member, which serve as a reflector. Therefore, due to the insertion of the reflective surface and the holding member, heat dissipation is poor.

[0008] In view of the above, the purpose of this technology is to provide a light source device, headlight, display device, and lighting device with excellent heat dissipation.

[0009] Solution to the problem

[0010] To achieve the above objectives, the light source device according to embodiments of the present technology includes a substrate, a phosphor, a light-emitting element, and a wavelength-selective reflective member.

[0011] The phosphor is positioned to contact the substrate.

[0012] The light-emitting element emits excitation light to excite the phosphor.

[0013] The wavelength-selective reflective element partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the excitation of the incident excitation light and the excitation light reflected by the phosphor.

[0014] Based on this structure, the heat generated by the phosphor is rapidly radiated to the substrate.

[0015] Wavelength-selective reflective elements can be positioned relative to the phosphor in the optical path of the fluorescence and the excitation light reflected by the phosphor.

[0016] The substrate may include a recess, and at least a portion of the phosphor may be disposed in the recess.

[0017] A recess may be formed on a first surface of the substrate, and a phosphor may be disposed in the recess such that the surface of the phosphor located on the wavelength selective reflective member side is flush with the first surface.

[0018] Wavelength-selective reflective components can be fixed to the substrate.

[0019] Wavelength-selective reflective components can be kept out of contact with phosphors.

[0020] The wavelength-selective reflective member may include: a first reflective portion that partially transmits and partially reflects excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident excitation light and excitation light reflected by the phosphor; and a second reflective portion that reflects the excitation light passing through the first reflective portion to guide the excitation light to the outside of the light source device.

[0021] The light source device may include two light-emitting elements arranged opposite each other, with a wavelength-selective reflective member between the two light-emitting elements.

[0022] The wavelength-selective reflective member may include: a first reflective portion that partially reflects a first excitation light emitted from one of the two light-emitting elements to guide the first excitation light to a phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident first excitation light and the first excitation light reflected by the phosphor; and a second reflective portion that partially reflects a second excitation light emitted from the other of the two light-emitting elements to guide the second excitation light to a phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident second excitation light and the second excitation light reflected by the phosphor.

[0023] The first reflector can partially reflect the second excitation light that passes through the second reflector and is guided to the first reflector, and the second reflector can partially reflect the first excitation light that passes through the first reflector and is guided to the second reflector, so as to guide the first excitation light and the second excitation light to the outside of the light source device.

[0024] The wavelength-selective reflective component can be a single structure comprising a first reflective part and a second reflective part.

[0025] The substrate and the phosphor can have irregularities on the surfaces that come into contact with each other.

[0026] The light source device may further include a light receiving element that receives light emitted from the wavelength selective reflective member and not emitted outside the light source device.

[0027] The light source device may further include a control unit that controls the output of excitation light from the light-emitting element based on the output from the light-receiving element.

[0028] To achieve the above objectives, the headlight according to embodiments of the present technology includes a light source device and an optical system.

[0029] The light source device includes: a substrate; a phosphor arranged in contact with the substrate; a light-emitting element that emits excitation light for exciting the phosphor; and a wavelength-selective reflective member that partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident excitation light and the excitation light reflected by the phosphor.

[0030] Light from the light source is incident on the optical system.

[0031] To achieve the above objectives, the display device according to embodiments of the present technology includes a light source device and a light modulation element.

[0032] The light source device includes: a substrate; a phosphor arranged in contact with the substrate; a light-emitting element that emits excitation light for exciting the phosphor; and a wavelength-selective reflective member that partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident excitation light and the excitation light reflected by the phosphor.

[0033] Light from the light source is incident on the light modulation element.

[0034] To achieve the above objectives, the lighting device according to the embodiments of the present technology includes a light source device.

[0035] The light source device includes: a substrate; a phosphor arranged in contact with the substrate; a light-emitting element that emits excitation light for exciting the phosphor; and a wavelength-selective reflective member that partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident excitation light and the excitation light reflected by the phosphor. Attached Figure Description

[0036] Figure 1 This is a cross-sectional view of a light source device according to the first embodiment of the present technology.

[0037] Figure 2 This is a cross-sectional view of the light source device according to the second embodiment.

[0038] Figure 3 This is a cross-sectional view of another light source device according to the second embodiment.

[0039] Figure 4This is a partial plan view of the light source device according to the third embodiment.

[0040] Figure 5 (A) is a cross-sectional view of the light source device according to the third embodiment. Figure 5 (B) is a partial cross-sectional view of the light source device.

[0041] Figure 6 This is a cross-sectional view of another light source device according to the third embodiment.

[0042] Figure 7 This is a cross-sectional view of the light source device according to the fourth embodiment.

[0043] Figure 8 This is a partial plan view of the light source device according to the fifth embodiment.

[0044] Figure 9 This is a cross-sectional view of the light source device according to the fifth embodiment.

[0045] Figure 10 This is a cross-sectional view of the light source device according to the sixth embodiment.

[0046] Figure 11 This is a cross-sectional view of another light source device according to the sixth embodiment.

[0047] Figure 12 This is a partial cross-sectional view of the light source device according to the seventh embodiment.

[0048] Figure 13 This is a partial cross-sectional view of the light source device according to the eighth embodiment.

[0049] Figure 14 This is a partial cross-sectional view of the light source device based on the modified example.

[0050] Figure 15 This is a partial plan view of the light source device according to another variation.

[0051] Figure 16 yes Figure 15 A cross-sectional view of the light source device.

[0052] Figure 17 This is a schematic cross-sectional view of a headlight using each of the above-mentioned light source devices.

[0053] Figure 18 This is a configuration diagram of a projector using each of the above-mentioned light source devices.

[0054] Figure 19 This is a schematic exploded perspective view of the backlight and liquid crystal display device using each of the above-mentioned light source devices.

[0055] Figure 20This is a schematic exploded perspective view of the backlight and liquid crystal display device using each of the above-mentioned light source devices.

[0056] Figure 21 This is a schematic cross-sectional view of a lighting device using each of the above-mentioned light source devices. Detailed Implementation

[0057] Embodiments of the light source device will be described below. In each embodiment, the same structural elements are labeled with the same reference numerals, and descriptions of structural elements already described are sometimes omitted. Furthermore, in each figure, excitation light is represented by dashed lines, and fluorescence is represented by solid lines.

[0058] (First Implementation)

[0059] Reference Figure 1 A light source device according to a first embodiment of the present technology is described.

[0060] like Figure 1 As shown, the light source device 10 includes a substrate 1, a phosphor 2, a laser diode 4 serving as an excitation light source and a light-emitting element, a sub-base 3, a wavelength selective reflective member 5, and a cover 6.

[0061] Here, in the light source device 10, an example of generating white light by means of blue laser and yellow light is given, the yellow light being light emitted from a yellow luminescent phosphor, but the type of laser light source and phosphor can be appropriately selected to obtain any hue.

[0062] Furthermore, in this embodiment, an example is given of using a blue laser and yellow light from a yellow luminescent phosphor when generating white light, but the technology is not limited thereto.

[0063] For example, white light can be generated using a blue laser, as well as red and green light emitted from red and green phosphors. As another example, white light can be generated using an ultraviolet laser, as well as red, green, and blue light emitted from phosphors that emit red, green, and blue light, respectively.

[0064] The substrate 1 is made of a material with excellent thermal conductivity. For example, ceramic materials or metal components such as AlN, SiC or Al2O3 are used for the substrate 1.

[0065] The substrate 1 has a first surface 1a. The phosphor 2 and the sub-base 3 are disposed on the first surface 1a, and the substrate 1 holds them. The substrate 1 is preferably formed of a material having a greater thermal conductivity than the phosphor 2, and thus is able to efficiently radiate the heat of the phosphor 2 to the substrate 1. The first surface 1a is a flat surface.

[0066] Laser diode 4 emits blue laser light as excitation light. The semiconductor of laser diode 4 can be a nitride semiconductor such as InAlGaN. The oscillation wavelength of the excitation light from laser diode 4 is, for example, 400 nm to 530 nm. When white light is produced by combining with YAG-based phosphor 2, the oscillation wavelength of the excitation light can be 400 nm to 500 nm.

[0067] Note that in this embodiment, the laser diode is exemplified as a light-emitting element used as an excitation source, but the technology is not limited to this. For example, a light-emitting diode (LED) or a vertical-cavity surface-emitting laser (VCSEL) can be used. For example, when using an LED, an optical system for focusing the emitted light can be provided. Furthermore, when using a VCSEL, the VCSEL can be arranged at an angle so that the excitation light is emitted horizontally to enter the wavelength-selective reflective member 5.

[0068] In this embodiment, since an end-face emitting laser diode is used, the optical system described above is not required. Furthermore, since tilting components like VCSELs are not needed, the structure can be simplified.

[0069] The phosphor 2 is excited by the excitation light 7 emitted from the laser diode 4 and emits light. For the phosphor 2 in this embodiment, a yellow emitting phosphor can be used, which is excited by a blue laser with a wavelength in the blue wavelength range (e.g., 400 nm to 500 nm) emitted from the laser diode 4 and emits yellow light (light in the wavelength range between the red and green wavelength ranges).

[0070] For example, yttrium aluminum garnet (YAG) based phosphors (e.g., Y3Al5O3). 12 ) etc. can be used for phosphors 2.

[0071] For phosphor 2, ceramic phosphors, single-crystal phosphors, sintered phosphors, or sintered bodies obtained by sintering a material containing powdered phosphors and a binder (such as ceramic materials) can be used.

[0072] The phosphor 2 is arranged such that at least a portion of its surface contacts and is fixed to the substrate 1. In this embodiment, the phosphor 2 has a cuboid shape, and one surface of the phosphor 2 contacts the first surface 1a of the substrate 1.

[0073] In this way, the phosphor 2 is arranged to contact the substrate 1 with high thermal conductivity, so that the heat generated by the phosphor 2 is effectively radiated to the substrate 1. This suppresses the temperature rise of the phosphor 2, suppresses the decrease in the conversion efficiency of the phosphor 2 (i.e., the ratio of excitation light entering the phosphor and being converted into fluorescence of different wavelengths), and suppresses the decrease in the output of white light emitted from the light source device 10.

[0074] The sub-base 3 is used to adjust the position of the emitted light from the excitation light of the laser diode 4 relative to the wavelength-selective reflective member 5. By using the sub-base 3, the height of the laser diode 4 as viewed from the substrate 1 can be adjusted.

[0075] For the sub-base 3, for example, SiC single crystal, AlN ceramic, Si single crystal, etc. can be used, but this technology is not limited to these. By using a material with excellent thermal conductivity for the sub-base 3, the heat generated from the laser diode 4 can be effectively radiated, and therefore it is advantageous to use a material with excellent thermal conductivity to form the sub-base 3.

[0076] In addition, steps can be provided on the substrate 1 to replace the sub-base 3 for adjusting the position of the laser diode 4, thereby eliminating the need for the sub-base 3.

[0077] For example, solder such as AuSn is used for bonding, to bond substrate 1 and sub-base 3, and to bond sub-base 3 and laser diode 4.

[0078] The sub-base 3 is provided with wiring and electrode pads for injecting current into the laser diode 4. Application paths for applying current via Au wiring are formed on the electrode pads using wire bonding. If the sub-base 3 is made of a conductive material, some wiring can be omitted.

[0079] The wavelength selective reflective member 5 has a reflective surface 51 that serves as a reflective part.

[0080] like Figure 1 As shown, the wavelength-selective reflector 5 is an optical component used to partially reflect the excitation light 7 through the reflective surface 51 and guide it to the phosphor 2. Furthermore, the wavelength-selective reflector 5 allows the transmission of yellow fluorescence 8 emitted from the phosphor 2 due to excitation caused by the incident excitation light 7, and blue excitation light 7a (reflected light) that does not excite the phosphor 2 but is reflected by it. In the light source device 10, the yellow fluorescence 8 and the blue excitation light 7a, which is reflected light from the phosphor 2, mix to emit white light to the outside of the light source device 10.

[0081] The excitation light 7b, which is not reflected by the reflective surface 51 and is transmitted through the reflective surface 51, is emitted from the wavelength-selective reflective member 5 and is not emitted to the outside of the light source device 10, so it does not contribute to the white light emitted from the light source device 10.

[0082] like Figure 1 As shown, the wavelength selective reflective member 5 is above and in contact with the phosphor 2 in the figure. The wavelength selective reflective member 5 can be fixed to the substrate 1 via a retaining member (not shown), or it can be fixed to the phosphor 2.

[0083] Therefore, the optical axis of the luminous flux of the excitation light 7 emitted from the laser diode 4, reflected by the reflective surface 51 of the wavelength-selective reflective member 5, and then entering the phosphor 2 will not jitter. In addition, the optical axis of the luminous flux of the fluorescence 8 emitted from the phosphor 2 and the excitation light 7a reflected by the phosphor 2 will not jitter, so that the hue and output of the white light emitted from the light source device 10 can be stabilized.

[0084] The excitation light 7 emitted from the laser diode 4 is emitted in a horizontal direction. In other words, the excitation light 7 is emitted such that its optical axis is parallel to the incident surface of the excitation light 7 of the phosphor 2. Furthermore, the wavelength selective reflective member 5 is arranged such that its reflective surface 51 forms an angle of approximately 45 degrees with respect to each of the incident surface of the phosphor 2 and the optical axis of the excitation light 7 emitted from the laser diode 4. Here, the term "approximately 45 degrees" includes a margin of error and includes, for example, 44 to 46 degrees.

[0085] The reflective surface 51 of the wavelength-selective reflective member 5 partially reflects and partially transmits the excitation light 7 emitted from the laser diode 4, and further transmits the fluorescence 8 from the phosphor 2 and partially transmits the excitation light 7a (reflected light) reflected by the phosphor 2.

[0086] Because the reflective surface 51 is configured to partially transmit the excitation light 7 in this manner, a portion of the excitation light 7a reflected by the phosphor 2 (reflected light) is transmitted through the reflective surface 51 to contribute to the white light emitted to the outside of the light source device 10.

[0087] The wavelength selective reflective member 5 is configured such that its reflective surface 51 is located in the optical path of the fluorescence 8 and the excitation light 7a (reflected light), and is positioned above the phosphor 2 in the figure. That is, the reflective surface 51 of the wavelength selective reflective member 5 is located on the side of the emission direction of the white light formed by the mixture of fluorescence and excitation light relative to the phosphor 2.

[0088] Here, for example, suppose that the reflector that reflects the excitation light emitted from the laser diode so that the excitation light is incident on the phosphor is arranged closer to the laser diode rather than above the phosphor. In this case, the distance between the reflector and the phosphor increases, and the cross-sectional shape of the luminous flux of the excitation light emitted from the laser diode and incident on the phosphor is prone to diffusion. Therefore, an optical system such as a condenser lens is needed.

[0089] On the other hand, in this embodiment, the wavelength selective reflector 5 is configured to have a reflective surface 51 that partially reflects the excitation light 7 and transmits the fluorescence 8. Thus, the wavelength selective reflector 5 can be arranged above the phosphor 2 in the optical path of the fluorescence 8 and the excitation light 7a (reflected light) that contribute to the white light emitted from the light source device 10.

[0090] By arranging the reflective surface 51 of the wavelength-selective reflective member 5 above the phosphor 2 in this manner, the distance between the reflective surface 51 and the phosphor 2 can be shortened, and the cross-sectional shape of the luminous flux of the excitation light 7 incident on the phosphor 2 is not excessively expanded. Therefore, the optical system described above becomes unnecessary, and the wavelength-selective reflective member itself can be miniaturized, thereby allowing for miniaturization of the light source device. Furthermore, since the number of components constituting the light source device can be reduced, costs can be lowered.

[0091] The cover 6, together with the substrate 1, forms a space for holding the phosphor 2, the laser diode 4, the sub-base 3, and the wavelength selective reflective member 5 therein. Nitrogen is filled into the space formed by the cover 6 and the substrate 1.

[0092] In this way, the light source device 10 is in a hermetically sealed packaged state.

[0093] The cover 6 includes a side wall portion 61 and a cover portion 62.

[0094] The sidewall portion 61 is positioned perpendicular to the first surface 1a of the substrate 1 and is arranged to surround the phosphor 2, the laser diode 4, the sub-base 3 and the wavelength selective reflective member 5.

[0095] The cover 62 is arranged opposite to the substrate 1 via the sidewall portion 61. The cover 62 is made of translucent glass. White light formed by the mixture of yellow fluorescent light 8 and blue excitation light 7a (reflected light) reflected by phosphor 2 passes through the cover 62 and is emitted to the outside of the light source device 10.

[0096] (Second Implementation)

[0097] Reference Figure 2 and Figure 3 A light source device according to a second embodiment of the present technology is described.

[0098] like Figure 2 and Figure 3 As shown, the light source device 20 includes a substrate 21, a phosphor 2, a laser diode 4, a sub-base 3, a wavelength selective reflective component 5, and a cover 6.

[0099] In the light source device 20 of this embodiment, a recess 21b is provided in the first surface 21a of the substrate 21, and at least a portion of the phosphor 2 is arranged in the recess 21b.

[0100] like Figure 2 As shown, the recess 21b can be configured such that the entire phosphor 2 is embedded in the substrate 21. The cuboid phosphor 2 is arranged in the recess 21b such that one surface of the phosphor 2 located on the wavelength selective reflective member 5 (the upper surface in the figure) is flush with the first surface 21a of the substrate 21.

[0101] Alternatively, such as Figure 3 As shown, the recess 21b can be configured such that a portion of the phosphor 2 is embedded in the substrate 21. In this case, the phosphor 2 is arranged in the recess 21b such that a portion of it protrudes from the first surface 21a of the substrate 21.

[0102] The phosphor 2 can be arranged in the recess 21b of the substrate 21 by forming a recess 21b in the substrate 21 and then assembling the pre-formed phosphor 2 in the recess 21b. Alternatively, the above configuration can be formed by filling the recess 21b of the substrate with the recess 21b with phosphor material and then sintering.

[0103] In the configuration of the first embodiment, only one surface of the phosphor 2 (the bottom surface in the figure) contacts the substrate 1. However, in this embodiment, in addition to this, the side surface of the phosphor 2 also contacts the substrate 21.

[0104] Therefore, compared to the first embodiment, the contact area between the substrate 21 and the phosphor 2 is increased, and heat dissipation is further improved. From the viewpoint of increasing the contact area, as... Figure 2 As shown, it is even more preferable to arrange the phosphor 2 in the recess 21b such that one surface of the phosphor 2 located on the wavelength selective reflective member 5 side is flush with the first surface 21a of the substrate 21, thereby improving heat dissipation.

[0105] This improves heat dissipation, which further suppresses the decrease in the conversion efficiency of phosphor 2 and suppresses the decrease in the output of white light emitted from light source device 20.

[0106] In the following third to sixth embodiments, an example will be described using a configuration in which the phosphor is arranged in a recess formed in the substrate such that the entire phosphor is embedded in the substrate. However, an example may also be used where the phosphor is arranged in a recess such that a portion of the phosphor is embedded in the substrate. Furthermore, as in the first embodiment, the phosphor may be arranged on a first surface of the substrate, which is a flat surface.

[0107] (Third Implementation)

[0108] Reference Figure 4 and Figure 5 A light source device 30 according to a third embodiment of the present technology is described.

[0109] Figure 4 This is a partial plan view of the light source device 30, and a view used to describe the positional relationship between the laser diodes 4A and 4B and the wavelength selective reflective member 35.

[0110] Figure 5 (A) is a cross-sectional view of the light source device 30.

[0111] Figure 5 (B) is a magnified cross-sectional view of the light source device 30 and a view used to describe the optical path of the excitation light 7. Figure 5 In (B), for ease of observation of the accompanying drawings, only the optical path of the light associated with the excitation light emitted from the second laser diode 4B is shown, but it is equally applicable to the optical path of the light associated with the excitation light emitted from the first laser diode 4A.

[0112] like Figure 4 and Figure 5 As shown, the light source device 30 includes a substrate 21, a phosphor 2, a first laser diode 4A, a second laser diode 4B, a first sub-base 3A, a second sub-base 3B, a wavelength selective reflective member 35, and a cover 6.

[0113] The first laser diode 4A and the second laser diode 4B have the same configuration as the laser diode 4 in the above embodiment.

[0114] Similarly, the first sub-base 3A and the second sub-base 3B have the same structure as the sub-base 3 in the above embodiment.

[0115] The first laser diode 4A and the first sub-base 3A are arranged opposite to the second laser diode 4B and the second sub-base 3B via a wavelength selective reflective member 35.

[0116] The wavelength selective reflective member 35 has a first reflective surface 351 as a first reflective part and a second reflective surface 352 as a second reflective part. The first reflective surface 351 and the second reflective surface 352 are arranged at right angles.

[0117] The wavelength selective reflective member 35 can be constructed as a single structure, for example, by bringing the surfaces of a cube wavelength selective reflective member having a first reflective surface 351 and a cube wavelength selective reflective member having a second reflective surface 352 into contact with each other.

[0118] like Figure 5 As shown in (B), the wavelength selective reflector 35 is an optical component used to partially reflect the excitation light 7 from the second laser diode 4B via the second reflective surface 352 and guide it to the phosphor 2. Furthermore, although the optical path is not shown in the figure, the wavelength selective reflector 35 partially reflects the excitation light 7 from the first laser diode 4A via the first reflective surface 351 and guides it to the phosphor 2.

[0119] Furthermore, a portion of the excitation light 7b that is transmitted through the second reflective surface 352 (first reflective surface 351) without being reflected by the second reflective surface 352 (first reflective surface 351) is reflected by the first reflective surface 351 (second reflective surface 352) to contribute to the white light emitted from the light source device 30.

[0120] Furthermore, the first reflective surface 351 and the second reflective surface 352 of the wavelength-selective reflective member 35 allow the transmission of the yellow fluorescence 8 emitted from the phosphor 2 caused by the excitation of the incident excitation light 7 and the blue excitation light 7a (reflected light) reflected by the phosphor 2. As a result, the yellow fluorescence and the blue excitation light mix and emit white light from the light source device 30.

[0121] In this manner, two laser diodes are arranged opposite each other, and a wavelength-selective reflective member 35 with two reflective surfaces 351 and 352 is provided, such that excitation light that has been transmitted through one reflective surface and has not been incident on the phosphor can be reflected by the other reflective surface to contribute white light. Thus, a light source device with improved light utilization efficiency can be provided.

[0122] Note that the wavelength selective reflective member with two reflective surfaces is not limited to the shape of the wavelength selective reflective member 35 described above. For example, similar arrangements... Figure 6 The wavelength-selective reflective member 36 in the light source device 31 shown can be in the shape of a square pyramid.

[0123] Figure 6 This is a cross-sectional view of the light source device 31 in another example.

[0124] like Figure 6 As shown, the light source device 31 includes a substrate 21, a phosphor 2, a first laser diode 4A, a second laser diode 4B, a first sub-base 3A, a second sub-base 3B, a wavelength selective reflective member 36, and a cover 6.

[0125] The wavelength selective reflector 36 has a square pyramid shape, i.e., a rectangular pyramid shape. The wavelength selective reflector 36 is arranged such that its vertex is located on the side of the substrate 1, and is arranged such that the vertex faces downwards in the figure and the base faces upwards in the figure.

[0126] The wavelength selective reflective member 36 has a pair of opposite side surfaces that form a first reflective surface 361 as a first reflective part and a second reflective surface 362 as a second reflective part. The wavelength selective reflective member 36 is a single structure with two reflective surfaces.

[0127] The wavelength selective reflector 36 is arranged with a retaining member (not shown) such that the extension of a vertical line from the vertex of the wavelength selective reflector 36 to the ground surface is perpendicular to the incident surface of the phosphor 2.

[0128] like Figure 6 As shown, the wavelength-selective reflector 36 is an optical component used to partially reflect the excitation light 7 from the second laser diode 4B via the second reflective surface 362 and guide it to the phosphor 2. Furthermore, although the optical path is not shown in the figure, the wavelength-selective reflector 36 partially reflects the excitation light 7 from the first laser diode 4A via the first reflective surface 361 and guides it to the phosphor 2.

[0129] Furthermore, the first reflective surface 361 and the second reflective surface 362 of the wavelength-selective reflective member 36 allow the transmission of the yellow fluorescence 8 emitted from the phosphor 2 due to the excitation caused by the incident excitation light 7 and the blue excitation light 7a (reflected light) reflected by the phosphor 2. As a result, the yellow fluorescence and the blue excitation light mix and emit white light from the light source device 31.

[0130] Furthermore, a portion of the excitation light 7b that passes through the second reflective surface 362 (first reflective surface 361) without being reflected by the second reflective surface 362 (first reflective surface 361) is reflected by the first reflective surface 361 (second reflective surface 362) to contribute to the white light emitted from the light source device 31.

[0131] In the light source device 31, yellow fluorescence 8, blue excitation light 7a (reflected light) reflected by phosphor 2, and excitation light transmitted through one reflective surface and reflected by another reflective surface are mixed to emit white light.

[0132] In this manner, two laser diodes are arranged opposite each other, and a wavelength-selective reflective member 36 with two reflective surfaces 361 and 362 is provided, such that excitation light that has been transmitted through one reflective surface and has not been incident on the phosphor can be reflected by the other reflective surface to contribute white light. Thus, a light source device with improved light utilization efficiency can be provided.

[0133] (Fourth Implementation)

[0134] Reference Figure 7 A light source device 40 according to a fourth embodiment of the present technology is described.

[0135] Figure 7 This is a cross-sectional view of the light source device 40.

[0136] like Figure 7 As shown, the light source device 40 includes a substrate 21, a phosphor 2, a first laser diode 4A, a second laser diode 4B, a first sub-base 3A, a second sub-base 3B, a first wavelength selective reflective member 45A, a second wavelength selective reflective member 45B, and a cover 6.

[0137] The first wavelength selective reflector 45A and the second wavelength selective reflector 45B have a structure similar to that of the wavelength selective reflector 5 in the first embodiment.

[0138] The first wavelength selective reflective member 45A (the second wavelength selective reflective member 45B) has a first reflective surface 451A (the second reflective surface 451B).

[0139] like Figure 7 As shown, the first wavelength selective reflector 45A and the second wavelength selective reflector 45B can be spaced apart from each other. The extended surfaces of the first reflective surface 451A and the second reflective surface 451B are configured to form right angles.

[0140] Similarly, in this embodiment, as in the third embodiment, two laser diodes are provided, along with two reflective surfaces 451A and 451B, such that excitation light that has been transmitted through one reflective surface but has not been incident on the phosphor can be reflected by the other reflective surface to contribute white light. This provides a light source device with improved light utilization efficiency.

[0141] Furthermore, in this embodiment, the first wavelength selective reflector 45A and the second wavelength selective reflector 45B are spaced apart from each other. Therefore, by changing the distance between the first wavelength selective reflector 45A and the second wavelength selective reflector 45B, the beam shape of the white light emitted from the light source device 40 can be adjusted to any shape.

[0142] (Fifth Implementation)

[0143] Reference Figure 8 and Figure 9 A light source device 50 according to a fifth embodiment of the present technology is described.

[0144] Figure 8 This is a partial plan view of the light source device 50, and a view used to describe the positional relationship between the four laser diodes 4A to 4D and the wavelength selective reflective member 55.

[0145] Figure 9 This is a cross-sectional view of the light source device 50, corresponding to the direction along... Figure 8 The cross-sectional view taken from lines AA and BB in the diagram.

[0146] Despite Figure 9 The optical path of the excitation light 7 is shown in the figure. For ease of viewing, only the optical path of the light associated with the excitation light emitted from the third laser diode 4C (fourth laser diode 4D) is shown. The same applies to the optical path of the light associated with the excitation light emitted from the first laser diode 4A (second laser diode 4B).

[0147] In the third and fourth embodiments, examples have been given of two laser diodes arranged opposite each other with a wavelength-selective reflective element in between; however, four laser diodes can be arranged, such as... Figure 8 As shown.

[0148] like Figure 8 and Figure 9 As shown, the light source device 50 includes a substrate 21, a phosphor 2, a first laser diode 4A, a second laser diode 4B, a third laser diode 4C, a fourth laser diode 4D, a first sub-base 3A, a second sub-base 3B, a third sub-base 3C, a fourth sub-base 3D, a wavelength selective reflective member 55, and a cover 6.

[0149] Each laser diode and each sub-base has a configuration similar to that described in the above embodiment.

[0150] like Figure 8 As shown, when viewed from above, four laser diodes 4A to 4D are arranged to correspond to the respective sides of the rectangular wavelength selective reflector 55 to surround the rectangular wavelength selective reflector 55.

[0151] The first laser diode 4A and the first sub-base 3A, as well as the third laser diode 4C and the third sub-base 3C, are arranged opposite each other, with the wavelength selective reflective member 55 between them.

[0152] The second laser diode 4B and the second sub-base 3B, as well as the fourth laser diode 4D and the fourth sub-base 3D, are arranged opposite each other, with the wavelength selective reflective member 55 between them.

[0153] The wavelength selective reflector 55 has a shape obtained by removing a square pyramid with one surface as the base from one side of a cuboid. The four inner surfaces of the wavelength selective reflector 55 are each configured as a reflective surface. The wavelength selective reflector 55 has four reflective surfaces 551 to 554. Reflective surface 551 (reflective surface 553), serving as a first reflective portion, and reflective surface 552 (reflective surface 554), serving as a second reflective portion, are configured to form right angles.

[0154] The wavelength-selective reflective element 55 is a single structure with four reflective surfaces.

[0155] like Figure 9As shown, the wavelength-selective reflector 55 is an optical component used to partially reflect the excitation light 7 emitted from the third laser diode 4C (fourth laser diode 4D) via reflective surface 552 (reflective surface 554) and guide it to the phosphor 2. Furthermore, although the optical path is not shown in the figure, the wavelength-selective reflector 55 partially reflects the excitation light 7 emitted from the first laser diode 4A (second laser diode 4B) via reflective surface 551 (reflective surface 553) and guides it to the phosphor 2.

[0156] Additionally, the reflective surfaces 551 to 554 of the wavelength-selective reflective member 55 transmit the yellow fluorescence 8 emitted from the phosphor 2 due to excitation caused by the incident excitation light 7, and the blue excitation light 7a (reflected light) reflected by the phosphor 2. As a result, the yellow fluorescence and the blue excitation light mix and emit white light from the light source device 50.

[0157] Furthermore, a portion of the excitation light 7b that passes through the reflective surface 552 (reflective surface 554) without being reflected by the reflective surface 552 (reflective surface 554) is reflected by the reflective surface 551 (reflective surface 553) facing the reflective surface 552 (reflective surface 554) to contribute to the white light emitted from the light source device 50.

[0158] Similarly, a portion of the excitation light 7b transmitted through the reflective surface 551 (reflective surface 553) without being reflected by the reflective surface 551 (reflective surface 553) is reflected by the reflective surface 552 (reflective surface 554) facing the reflective surface 551 (reflective surface 553) to contribute to the white light emitted from the light source device.

[0159] In this manner, four laser diodes are arranged, and wavelength-selective reflective members 55 with four reflective surfaces 551 to 554 are provided, such that excitation light that has been transmitted through the reflective surfaces but has not been incident on the phosphor can be reflected by the other reflective surfaces to contribute white light. Thus, a light source device 50 with improved light utilization efficiency can be provided.

[0160] (Sixth Implementation Method)

[0161] Reference Figure 10 and Figure 11 The light source devices 60 and 65 according to the sixth embodiment of the present technology are described.

[0162] Figure 10 This is a cross-sectional view of the light source device 60. Figure 11 This is a cross-sectional view of the light source device 65.

[0163] In any light source device, the shape of the phosphor is different from the shape of the phosphor 2 in the third embodiment.

[0164] like Figure 10As shown, the light source device 60 includes a substrate 63, a phosphor 64, laser diodes 4A and 4B, sub-bases 3A and 3B, a wavelength selective reflective member 35, and a cover 6.

[0165] like Figure 11 As shown, the light source device 65 includes a substrate 66, a phosphor 67, laser diodes 4A and 4B, sub-bases 3A and 3B, a wavelength selective reflective member 35, and a cover 6.

[0166] In the third embodiment, phosphor 2 has a cuboid shape, but phosphor 64 may have, for example, a rectangular shape. Figure 10 The spherical defect shape shown, or phosphor 67, may have the following characteristics: Figure 11 The cone shape shown.

[0167] like Figure 10 As shown, a spherical cap-shaped recess 63b is provided on the first surface 63a of the substrate 63, and a spherical cap-shaped phosphor 64 is disposed in the recess 63b. The recess 63b is configured such that the entire phosphor 64 is embedded in the substrate 63. The phosphor 64 is disposed in the recess 63b such that one surface of the phosphor located on the wavelength selective reflective member 35 side (the upper surface in the figure) is flush with the first surface 63a of the substrate 63.

[0168] like Figure 11 As shown, a tapered recess 66b is provided on the first surface 66a of the substrate 66, and a tapered phosphor 67 is disposed in the recess 66b. The recess 66b is configured such that the entire phosphor 67 is embedded in the substrate 66. The phosphor 67 is disposed in the recess 66b such that one surface of the phosphor located on the wavelength selective reflective member 35 side (the upper surface in the figure) is flush with the first surface 66a of the substrate 66.

[0169] A reflective film 641 (671) is formed on the surface of the phosphor 64 (67) that contacts the substrate 63 (66). As described above, a curved reflective film 641 or an inclined reflective film 671 is provided that is tilted relative to the first surface 66a of the substrate 66, such that excitation light transmitted through the phosphor 64 (67) without exciting the phosphor 64 (67) is reflected by the reflective film 641 (671). Since the reflected excitation light is transmitted through the phosphor 64 (67) again, the reflected excitation light can be used to emit light from the phosphor 64 (67), and the light utilization efficiency is improved.

[0170] Furthermore, in this embodiment, the phosphor has a spherical cap shape or a conical shape, but a cuboid shape can be used. In the cuboid shape, the thickness of the phosphor is reduced and a reflective film is formed on the surface of the phosphor that contacts the substrate.

[0171] (Seventh Implementation)

[0172] Figure 12 This is an enlarged view of the part where the substrate and the phosphor are in contact with each other.

[0173] In each of the above embodiments, such as Figure 12 As shown in (A) and (B), the uneven surface can be provided on the surface where the substrate 71 and the phosphor 72 are in contact with each other, specifically, on the surface where the bottom surface of the phosphor 72 is in contact with the substrate 71.

[0174] For example, in Figure 12 In (A), the cross-sectional shape of the convex part is rectangular, and... Figure 12 In (B), the cross-sectional shape of the uneven portion is wave-shaped. The shape of the uneven portion is not limited to those shapes mentioned above. For example, the cross-sectional shape of the protrusion can be triangular or semi-circular. Compared with setting a flat surface, setting an uneven surface in this way allows for an increase in the contact area between the substrate and the phosphor, and further improves heat dissipation.

[0175] (Eighth Implementation Method)

[0176] Reference Figure 13 A light source device 80 according to the eighth embodiment of the present technology is described.

[0177] Figure 13 This is a schematic cross-sectional view of the light source device 80.

[0178] like Figure 13 As shown, the light source device 80 includes a substrate 1, a phosphor 2, a laser diode 4, a sub-base 3, a wavelength selective reflective member 5, a cover 6, a light receiving sensor 81 used as a light receiving element, and a controller 82.

[0179] The light receiving sensor 81 is disposed in the space surrounded by the substrate 1 and the cover 6.

[0180] The light receiving sensor 81 receives light emitted from the wavelength-selective reflective member 5, which is leakage light that does not contribute to the white light emitted from the light source device 80. The detection result detected by the light receiving sensor 81 is output to the controller 82.

[0181] The controller 82 controls the output of excitation light from the laser diode 4 based on the detection results output from the light receiving sensor 81. The state of the phosphor 2 can be determined from the detection results. For example, if the detection results indicate a deterioration in the function of the phosphor 2, the controller 82 performs control to increase the output of excitation light emitted from the laser diode 4, thereby stabilizing the output of white light emitted from the light source device 80.

[0182] (Ninth Implementation)

[0183] Reference Figure 14A light source device according to a ninth embodiment of the present technology is described.

[0184] In the above embodiments, examples are given of arranging the wavelength-selective reflective member 5 and the phosphor 2 in contact with each other. However, as in Figure 14 In the light source device 15 shown, the wavelength selective reflector 5 and the phosphor 2 can be arranged in a non-contact state. The position of the wavelength selective reflector 5 is fixed by a holding member (not shown) to hold the wavelength selective reflector 5 in the substrate 1.

[0185] The wavelength selective reflector 5 and the phosphor 2 are arranged in a non-contact manner, which suppresses the effect of heat generated by the phosphor 2 on the wavelength selective reflector 5 and suppresses the deformation of the wavelength selective reflector 5 caused by heat. Therefore, the optical axis of the luminous flux is less jittery, and the hue and output of the white light emitted from the light source device 10 can be stabilized.

[0186] (Tenth Implementation)

[0187] Reference Figure 15 and Figure 16 A light source device 58 according to the tenth embodiment of the present technology is described.

[0188] Figure 15 This is a partial plan view of the light source device 58, and a view used to describe the positional relationship between the laser diodes 4A and 4B and the wavelength selective reflective member 55.

[0189] Figure 16 This is a cross-sectional view of the light source device 58, corresponding to the view along... Figure 15 The cross-sectional view taken from lines AA and BB in the diagram.

[0190] In the third and fourth embodiments, examples have been given of two laser diodes arranged opposite each other via a wavelength-selective reflective member. However, the two laser diodes can be arranged with a 90-degree positional relationship relative to the wavelength-selective reflective member, such as... Figure 15 As shown.

[0191] like Figure 15 and Figure 16 As shown, the light source device 58 includes a substrate 21, a phosphor 2, a first laser diode 4A, a second laser diode 4B, a first sub-base 3A, a second sub-base 3B, a wavelength selective reflective member 55, and a cover 6.

[0192] The first laser diode 4A and the first sub-base 3A, as well as the second laser diode 4B and the second sub-base 3B, are arranged in a positional relationship of 90 degrees relative to the wavelength selective reflective member 55.

[0193] The wavelength selective reflector 55 has the same structure as the wavelength selective reflector of the fifth embodiment, and has four reflective surfaces 551 to 554. The reflective surfaces 551 (reflective surface 553) and 552 (reflective surface 554) are arranged to form a right angle.

[0194] like Figure 16 As shown, the wavelength-selective reflective member 55 is an optical member used to partially reflect the excitation light 7 emitted from the first laser diode 4A (second laser diode 4B) through the reflective surface 551 (reflective surface 553) and guide it to the phosphor 2.

[0195] Furthermore, the reflective surfaces 551 to 554 of the wavelength-selective reflective member 55 transmit blue excitation light 7a reflected by the phosphor 2 and yellow fluorescence 8 emitted from the phosphor 2 due to excitation caused by the incident excitation light 7. In the light source device 58, the yellow fluorescence 8 and the blue excitation light 7 are mixed to emit white light.

[0196] A portion of the excitation light 7b that is transmitted but not reflected by the reflective surface 551 (553) used as the first reflective part is reflected by the reflective surface 552 (554) used as the second reflective part, and contributes to the white light emitted from the light source device 58.

[0197] In the light source device 58, yellow fluorescence 8, blue excitation light 7a reflected by phosphor 2, and excitation light transmitted through one reflective surface and reflected by another reflective surface are mixed to emit white light.

[0198] Therefore, two laser diodes are provided, and a wavelength-selective reflective member 55 with four reflective surfaces 551 to 554 is provided, so that excitation light that has been transmitted through the reflective surfaces but has not been incident on the phosphor can be reflected by another reflective surface to contribute white light. Thus, a light source device 58 with improved light utilization efficiency can be provided.

[0199] Note that in this embodiment, four reflective surfaces are provided for two laser diodes, but two reflective surfaces can be provided for one laser diode, so that a light source device with good light utilization efficiency can be provided similarly.

[0200] Next, the headlight, display device, and lighting device will be described as devices that utilize each of the aforementioned light source devices. Furthermore, although the following description is omitted, a cooling mechanism for cooling the light source device may be provided in contact with the substrate of the light source device. By providing a cooling mechanism, the influence of the heat generated by the light source device on the operating characteristics of the device using the light source device can be suppressed.

[0201] (Example of headlight application)

[0202] Figure 17This is a schematic cross-sectional view of the headlight 100.

[0203] The vehicle headlight 100 includes a light source device 10 (15,20,30,31,40,50,58,60,65,80), a reflector 101 having a reflective surface 101a as an optical system, and a projection lens 102. White light emitted from the light source device 10 (15,20,30,31,40,50,58,60,65,80) is reflected by the reflective surface 101a of the reflector 101 and emitted to the outside of the headlight 100 via the projection lens 102 to illuminate the front of the vehicle.

[0204] (Examples of display device applications)

[0205] Figure 18 This is a schematic configuration diagram of the projector 200 as a display device.

[0206] The projector 200, used as a video projection display device, includes a light source device 10 (15, 20, 30, 31, 40, 50, 58, 60, 65, 80), a color separation optical system 210, a synthesis optical system 220, and a projection optical system 230.

[0207] The color separation optical system 210 separates the white light (LW) emitted from the light source device 10 (15,20,30,31,40,50,58,60,65,80) into red component light (LR), blue component light (LB), and green component light (LG).

[0208] The synthesizing optical system 220 modulates the light of each color component separated by the dichroic optical system 210 to become the color components of the desired image, and then synthesizes the modulated light to produce the desired video.

[0209] The projection optics system 230 is an optical system such as a projection lens or a mirror. The projection optics system 230 projects the video generated by the synthesis optics system 220 onto a video display unit such as a screen 240 to display the video.

[0210] The dichroic optical system 210 includes dichroic mirrors 211 and 212, mirrors 213 to 215, and relay lenses 216 and 217.

[0211] Dichroic mirror 211 transmits the red component (LR) of white light (LW) emitted from light source device 10 (15,20,30,31,40,50,58,60,65,80), and reflects the blue component (LB) and green component (LG).

[0212] The mirror 214 reflects the red component of the light transmitted through the dichroic mirror 211 (LR) so that it is incident on the field lens 223R of the synthetic optical system 220.

[0213] Dichroic mirror 212 transmits the blue component light (LB) from the blue component light (LB) and the green component light (LG) reflected by dichroic mirror 211, and reflects the green component light (LG).

[0214] The green component light (LG) reflected by the dichroic mirror 212 is incident on the field lens 223G of the synthetic optical system 220.

[0215] The reflector 213 reflects the blue component light (LB) transmitted through the dichroic mirror 212 and the relay lens 216 so that it is incident on the relay lens 217.

[0216] The mirror 215 reflects the blue component light (LB) incident on the relay lens 217 and transmits it through the relay lens 217 so that it is incident on the field lens 223B of the synthesizing optical system 220.

[0217] The composite optical system 220 includes a cross dichroic prism 221, a red light modulation element 222R and a field lens 223R, a green light modulation element 222G and a field lens 223G, and a blue light modulation element 222B and a field lens 223B.

[0218] For example, a transmissive liquid crystal panel can be used for each light modulation element.

[0219] The red component light (RG) incident on the red field lens 223R and transmitted through the field lens 223R is modulated into the red component of the desired image in the light modulation element 222R and incident on the cross dichroic prism 221.

[0220] Similarly, the green component light (RG) (blue component light (RB)) incident on the green field lens 223G (blue field lens 223B) and transmitted through the field lens 223G (223B) is modulated into the green component (blue component) of the desired image in the light modulation element 222G (222B) and incident on the cross dichroic prism 221.

[0221] The cross dichroic prism 221 combines and modulates the red, green, and blue component light, and outputs the combined light to the projection optical system 230.

[0222] Note that the color separation optical system 210, the synthesis optical system 220 and the projection optical system 230 constituting the projector 200 may be known and are not limited to the structures described herein.

[0223] Furthermore, the light source device 10 (15,20,30,31,40,50,58,60,65,80) of this technology can be used as the backlight of a liquid crystal display device.

[0224] Figure 19 This is a schematic exploded perspective view of a liquid crystal display device using a backlighting system with an edge light system.

[0225] Figure 20 This is a schematic exploded perspective view of a liquid crystal display device using a direct system backlight.

[0226] like Figure 19 ( Figure 20 As shown, the liquid crystal display device 250 (260), which is a display device, includes a transmissive liquid crystal panel 251 and a backlight 252 (262). In the liquid crystal display device 250 (260), the rear side of the transmissive liquid crystal panel 251 is illuminated by white light emitted from the backlight 252 (262). The illumination light is transmitted through the transmissive liquid crystal panel 251, thereby controlling its transmittance. As a result, an image is displayed on the transmissive liquid crystal panel 251.

[0227] like Figure 19 As shown, the backlight 252 of the edge light system includes a diffuser 2521, a light guide plate 2522, a reflector 2523, and multiple light source devices 10 (15, 20, 30, 31, 40, 50, 58, 60, 65, 80).

[0228] Multiple light source devices 10 (15, 20, 30, 31, 40, 50, 58, 60, 65, 80) are arranged along a pair of opposite sides of a light guide plate 2522 having a rectangular planar shape. Note that in this embodiment, an example of a backlight in which multiple light source devices are arranged along both sides is described, but a backlight in which the light source devices are arranged along one side may also be provided.

[0229] like Figure 20 As shown, the backlight 262 of the direct system includes a diffuser 2621, a diffuser plate 2622, a reflector 2623, and multiple light source devices 10 (15, 20, 30, 31, 40, 50, 58, 60, 65, 80). The multiple light source devices are arranged, for example, in a matrix on the reflector 2623.

[0230] (Examples of lighting applications)

[0231] Figure 21 This is a schematic cross-sectional view of a lighting device 300. The lighting device 300 illuminates, for example, an indoor or outdoor space.

[0232] like Figure 21As shown, the lighting device 300 includes a plurality of light source devices 10 (15,20,30,31,40,50,58,60,65,80), a translucent cover 301, and a base 302. The plurality of light source devices 10 (15,20,30,31,40,50,58,60,65,80) are arranged on the base 302, and the translucent cover 301 is provided to cover the plurality of light source devices. Light emitted from the light source devices 10 (15,20,30,31,40,50,58,60,65,80) is emitted to the outside of the lighting device 300 via the translucent cover 301.

[0233] The implementation of this technology is not limited to the above-described implementation, and various modifications can be made without departing from the spirit of this technology.

[0234] Note that this technology can be configured as follows.

[0235] (1) A light source device, comprising:

[0236] substrate;

[0237] Phosphors arranged in contact with the substrate;

[0238] Light-emitting elements that emit excitation light to excite phosphors; and

[0239] The wavelength-selective reflective element partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident excitation light and the excitation light reflected by the phosphor.

[0240] (2) The light source device according to (1), wherein

[0241] The wavelength-selective reflective element is positioned relative to the phosphor in the optical path of the fluorescence and the excitation light reflected by the phosphor.

[0242] (3) The light source device according to (1) or (2), wherein,

[0243] The substrate includes a recess, in which at least a portion of the phosphor is disposed.

[0244] (4) The light source device according to (3), wherein

[0245] The recess is formed in the first surface of the substrate; and

[0246] The phosphor is arranged in the recess with its surface on the wavelength-selective reflective member side flush with the first surface.

[0247] (5) The light source device according to any one of (1) to (4), wherein,

[0248] The wavelength-selective reflective element is fixed to the substrate.

[0249] (6) The light source device according to any one of (1) to (5), wherein,

[0250] The wavelength-selective reflective component does not come into contact with the phosphor.

[0251] (7) The light source device according to any one of (1) to (6), wherein,

[0252] Wavelength selective reflective components include:

[0253] The first reflective section partially transmits and partially reflects excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident excitation light and excitation light reflected by the phosphor; and

[0254] The second reflector reflects the excitation light transmitted through the first reflector to guide the excitation light to the outside of the light source device.

[0255] (8) The light source device according to any one of (1) to (6), wherein,

[0256] The light source device includes two light-emitting elements arranged opposite to each other, with a wavelength-selective reflective component positioned between the two light-emitting elements.

[0257] Wavelength selective reflective components include:

[0258] The first reflective portion partially reflects the first excitation light emitted from one of the two light-emitting elements to guide the first excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident first excitation light and the first excitation light reflected by the phosphor; and

[0259] The second reflective portion partially reflects the second excitation light emitted from the other of the two light-emitting elements to guide the second excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident second excitation light and the second excitation light reflected by the phosphor; and

[0260] The first reflector partially reflects the second excitation light that passes through the second reflector and is guided to the first reflector, and the second reflector partially reflects the first excitation light that passes through the first reflector and is guided to the second reflector, so as to guide the first excitation light and the second excitation light to the outside of the light source device.

[0261] (9) The light source device according to (7) or (8), wherein

[0262] The wavelength-selective reflective component is a single structure comprising a first reflective part and a second reflective part.

[0263] (10) The light source device according to any one of (1) to (9), wherein,

[0264] The substrate and the phosphor have uneven surfaces that come into contact with each other.

[0265] (11) The light source device according to any one of (1) to (10) further comprises:

[0266] A light receiving element that receives light emitted from a wavelength-selective reflective element and does not emit it outside the light source device.

[0267] (12) The light source device according to (11) further includes:

[0268] The control unit controls the output of excitation light from the light-emitting element based on the output from the light-receiving element.

[0269] (13) A headlight, comprising:

[0270] Light source device, including:

[0271] substrate;

[0272] Phosphors arranged in contact with the substrate;

[0273] Light-emitting elements that emit excitation light to excite phosphors; and

[0274] A wavelength-selective reflective element partially reflects excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident excitation light and excitation light reflected by the phosphor; and

[0275] An optical system in which light from a light source is incident.

[0276] (14) A display device, comprising:

[0277] Light source device, including:

[0278] substrate;

[0279] Phosphors are arranged to contact the substrate;

[0280] Light-emitting elements that emit excitation light to excite phosphors; and

[0281] A wavelength-selective reflective element partially reflects excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits fluorescence emitted from the phosphor due to excitation caused by the incident excitation light and excitation light reflected by the phosphor; and

[0282] An optical modulation element is formed by light from a light source being incident on it.

[0283] (15) A lighting device, comprising:

[0284] Light source device, including:

[0285] substrate;

[0286] Phosphors arranged in contact with the substrate;

[0287] Light-emitting elements that emit excitation light to excite phosphors; and

[0288] The wavelength-selective reflective element partially reflects the excitation light emitted from the light-emitting element to guide the excitation light to the phosphor, and transmits the fluorescence emitted from the phosphor caused by the incident excitation light and the excitation light reflected by the phosphor.

[0289] Reference number list

[0290] 1, 21, 63, 66, 71 base plate

[0291] 2, 62, 67, 72 phosphors

[0292] 4. 4A, 4B Laser Diodes (Light Emitting Elements)

[0293] Wavelength selective reflective components at 5, 35, 36, and 55 nm

[0294] 7. Excitation light

[0295] 8. Fluorescence

[0296] Light source devices with ratings of 10, 15, 20, 30, 31, 40, 50, 58, 60, 65, and 80.

[0297] 21a, 63a, 66a First Surface

[0298] 21b, 63b, 66b concave part

[0299] 45A First wavelength selective reflector (wavelength selective reflector)

[0300] 45B Second Wavelength Selective Reflector (Wavelength Selective Reflector)

[0301] 100 headlamp

[0302] 101 Reflector (Optical System)

[0303] 102 Projection Lens (Optical System)

[0304] 20 0 Projector (Display Device)

[0305] 222R, 222G, 222B optical modulation elements

[0306] 250, 260 LCD display devices (display devices)

[0307] 251 LCD panel (light modulation element)

[0308] 300 lighting fixtures

[0309] 351, 361, 451A First reflective surface (first reflective part)

[0310] 352, 362, 451B Second reflective surface (second reflective part)

[0311] 551, 553 Reflective surfaces (first reflective part)

[0312] 552, 554 Reflective surfaces (second reflective parts).

Claims

1. A light source apparatus comprising: a substrate; a phosphor disposed in contact with the substrate; a light emitting element that emits excitation light for exciting the phosphor; and a wavelength selective reflection member that partially reflects the excitation light emitted from the light emitting element to direct the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor by reflection of the excitation light by the phosphor and excitation caused by incidence of the excitation light on the phosphor.

2. The light source apparatus according to claim 1, wherein the wavelength selective reflection member is located on an optical path of the fluorescent light and the excitation light reflected by the phosphor with respect to the phosphor.

3. The light source apparatus according to claim 2, wherein the substrate includes a recess in which at least a portion of the phosphor is disposed.

4. The light source apparatus according to claim 3, wherein the recess is formed in a first surface of the substrate; and the phosphor is disposed in the recess such that a surface of the phosphor located on a side of the wavelength selective reflection member is flush with the first surface.

5. The light source apparatus according to claim 2, wherein the wavelength selective reflection member is fixed to the substrate.

6. The light source apparatus according to claim 2, wherein the wavelength selective reflection member is not in contact with the phosphor.

7. The light source apparatus according to claim 2, wherein the wavelength selective reflection member includes: a first reflection portion that partially transmits and partially reflects the excitation light emitted from the light emitting element to direct the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor by excitation caused by incidence of the excitation light and the excitation light reflected by the phosphor; and a second reflection portion that reflects the excitation light that has passed through the first reflection portion to direct the excitation light outside of the light source apparatus.

8. The light source apparatus according to claim 2, wherein the light source apparatus includes two of the light emitting elements disposed opposite each other, the wavelength selective reflection member being interposed between the two light emitting elements; the wavelength selective reflection member includes: a first reflection portion that partially reflects first excitation light emitted from one of the two light emitting elements to direct the first excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor by excitation caused by incidence of the first excitation light and the first excitation light reflected by the phosphor; and a second reflection portion that partially reflects second excitation light emitted from the other of the two light emitting elements to direct the second excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor by excitation caused by incidence of the second excitation light and the second excitation light reflected by the phosphor; and ​ ​ The first reflecting portion partially reflects the second excitation light that passes through the second reflecting portion and is guided to the first reflecting portion, and the second reflecting portion partially reflects the first excitation light that passes through the first reflecting portion and is guided to the second reflecting portion, to guide the first excitation light and the second excitation light to the outside of the light source device.

9. The light source device according to claim 7 or 8, wherein The wavelength selection reflecting member is a single structure including the first reflecting portion and the second reflecting portion.

10. The light source device according to claim 2, wherein The substrate and the phosphor have unevenness on surfaces in contact with each other.

11. The light source device according to claim 1, further comprising: a light receiving element that receives light emitted from the wavelength selection reflecting member and that is not emitted to the outside of the light source device.

12. The light source device according to claim 11, further comprising: a control unit that controls output of the excitation light from the light emitting element based on output from the light receiving element.

13. A headlamp comprising: a light source device including: a substrate; a phosphor arranged in contact with the substrate; a light emitting element that emits excitation light for exciting the phosphor; and a wavelength selection reflecting member that partially reflects the excitation light emitted from the light emitting element to guide the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor due to the excitation light reflected by the phosphor and excitation caused by the excitation light incident on the phosphor; and an optical system on which light from the light source device is incident.

14. A display device comprising: a light source device including: a substrate; a phosphor arranged in contact with the substrate; a light emitting element that emits excitation light for exciting the phosphor; and a wavelength selection reflecting member that partially reflects the excitation light emitted from the light emitting element to guide the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor due to the excitation light reflected by the phosphor and excitation caused by the excitation light incident on the phosphor; and a light modulating element on which light from the light source device is incident.

15. An illumination device comprising: a light source device including: a substrate; a phosphor arranged in contact with the substrate; a light emitting element that emits excitation light for exciting the phosphor; and a wavelength selection reflecting member that partially reflects the excitation light emitted from the light emitting element to guide the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor due to the excitation light reflected by the phosphor and excitation caused by the excitation light incident on the phosphor.

Images