JP2012119121A - Light source device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which can further enhance brightness, as compared with a prior art.SOLUTION: The device includes a plurality of solid light sources 5a, 5b, 5c emitting light of given wavelengths out of a wavelength range from ultraviolet light to visible light, at least one phosphor 2 excited by light from the plurality of solid light sources 5a, 5b, 5c for emitting fluorescence of a wavelength longer than emission wavelengths of the plurality of solid light sources 5a, 5b, 5c, and a plurality of reflection mirrors 4a, 4b, 4c fitted in correspondence to the plurality of solid light sources 5a, 5b, 5c for reflecting and converging light from the plurality of solid light sources 5a, 5b, 5c to at least one phosphor 2.

Description

  The present invention relates to a light source device and an illumination device.

  Conventionally, for example, Patent Document 1 discloses a light-emitting device including an excitation light source 10 and a wavelength conversion member 40 as shown in FIG. Here, the excitation light source 10 is a light source for emitting excitation light, and is not particularly limited as long as it emits light that can excite a fluorescent material to be described later. An LED or the like can be used. Further, the wavelength conversion member 40 absorbs part or all of the excitation light emitted from the excitation light source 10 and converts the wavelength into light of a predetermined wavelength range, for example, red, green, blue, and intermediate colors thereof. It can emit light having an emission spectrum in a certain yellow, blue-green, orange, or the like, and a fluorescent material can be used. In FIG. 1, 20 is a light guide member for guiding light from the excitation light source 10 to the wavelength conversion member 40, and 30 is a covering member.

JP 2008-004419 A

  By the way, when the conventional light emitting device as shown in FIG. 1 is composed of one excitation light source 10, one light guide member 20, and one wavelength conversion member 40, Since incident excitation light is limited to excitation light from one excitation light source 10, no further improvement in emission luminance can be expected.

  Even when the light emitting device includes a plurality of light emitting devices of one unit, although the output light flux of the light emitting device is improved, the excitation light incident on one wavelength conversion member 40 is transmitted from one excitation light source 10. Therefore, the emission luminance is the same as that of the light emitting device of one unit.

  Thus, conventionally, there is a limit to increasing the luminance because the emission luminance cannot be further increased.

  An object of the present invention is to provide a light source device and an illuminating device capable of further increasing the brightness as compared with the conventional art.

  In order to achieve the above object, the invention described in claim 1 includes a plurality of solid light sources that emit light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and light from the plurality of solid light sources. At least one phosphor that emits fluorescence having a wavelength longer than the emission wavelength of the plurality of solid light sources, and is provided corresponding to each of the plurality of solid light sources, and emits light from the plurality of solid light sources. And a plurality of reflecting mirrors that reflect and condense at least one phosphor.

  According to a second aspect of the present invention, in the light source device according to the first aspect, the plurality of solid state light sources and the plurality of reflecting mirrors are arranged in rotational symmetry with respect to a predetermined symmetry axis. Yes.

  According to a third aspect of the present invention, there is provided the light source device according to the first or second aspect, wherein each of the solid light sources has a main optical axis and is opposite to a side where the phosphor is disposed. The main optical axis emits light at an angle of 90 ° or less with respect to a predetermined symmetry axis, and each reflecting mirror corresponding to each solid light source includes an angle range of the emitted light from each solid light source. A reflecting surface is formed as a part of the spheroid, and the light emitting portion of each solid-state light source is disposed at the first focal point of the spheroid forming the reflecting surface of each reflecting mirror, and the at least one phosphor Is arranged at the second focal point of the spheroid constituting the reflecting surface of each reflecting mirror.

  According to a fourth aspect of the present invention, there is provided an illuminating device in which the light source device according to the first to third aspects is used.

  According to the first to fourth aspects of the present invention, a plurality of solid-state light sources that emit light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and excitation by light from the plurality of solid-state light sources And at least one phosphor that emits fluorescence having a wavelength longer than the emission wavelength of the plurality of solid light sources, and provided corresponding to the plurality of solid light sources, respectively. Since it includes a plurality of reflecting mirrors that reflect and condense to one phosphor, light from a plurality of solid state light sources can be collected on at least one phosphor, which is much higher than in the past. High brightness can be achieved.

It is a figure which shows the conventional light-emitting device. It is a figure which shows the positional relationship of the solid light source and fluorescent substance in the light source device of this invention. It is a figure which shows the example of an at least 1 fluorescent substance in case a some solid light source and a some reflective mirror are each arrange | positioned 3 by 120 degree intervals centering on a predetermined | prescribed symmetry axis. It is a figure which shows the 1st specific example of the light source device of this invention. It is a figure which shows the 2nd specific example of the light source device of this invention. It is a figure which shows the 3rd specific example of the light source device of this invention. It is a figure which shows the 4th specific example of the light source device of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The light source device of the present invention includes a plurality of solid light sources (semiconductor light sources) that emit light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and the plurality of light sources that are excited by light from the plurality of solid light sources. At least one phosphor that emits fluorescence having a longer wavelength than the emission wavelength of the solid light source, and the plurality of solid light sources, respectively, and the light from the plurality of solid light sources is supplied to the at least one phosphor. And a plurality of reflecting mirrors that reflect and collect light.

  Here, for each of the plurality of solid-state light sources (semiconductor light sources), a light-emitting diode or a semiconductor laser having a light emission wavelength from the ultraviolet light to the visible light region can be used.

More specifically, for each solid-state light source, for example, a light emitting diode or a semiconductor laser that emits near ultraviolet light having an emission wavelength of about 380 nm to about 400 nm using an InGaN-based material can be used. In this case, the phosphor is excited by ultraviolet light having a wavelength of about 380 nm to about 400 nm. For example, the red phosphor includes CaAlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N ₈ : Eu ²⁺ , La ₂ O ₂ S: Eu ³⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ^{4+ and the} like can be used, and (Ba, Sr) ₂ SiO ₄ : Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu can be used as a green phosphor. ²⁺ , Mn ²⁺ , (Si, Al) ₆ (O, N) ₈ : Eu ^{2+ and the} like can be used, and (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ C ₁₂ can be used as a blue phosphor. : Eu ²⁺ , LaAl (Si, Al) ₆ (O, N) ₁₀ : Ce ³⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ^{2+ and the} like can be used.

For each solid-state light source, for example, a light emitting diode or semiconductor laser that emits blue light having a light emission wavelength of about 460 nm using a GaN-based material can be used. In this case, the phosphor is excited by blue light having a wavelength of about 440 nm to about 470 nm. For example, the red phosphor includes CaAlSiN ₃ : Eu ²⁺ , Ca ₂ Si ₅ N ₈ : Eu ²⁺ , KSiF. ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ^{4+ and the} like can be used. For the yellow phosphor, Y ₃ Al ₅ O ₁₂ : Ce ³⁺ (YAG), (Sr, Ba) ₂ SiO ₄ : Eu ²⁺ , Ca _x (Si, Al) ₁₂ (O, N) ₁₆ : Eu ²⁺ or the like can be used, and for the green phosphor, Y ₃ (Ga, Al) ₅ O ₁₂ : Ce ³⁺ , Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce ³⁺ , CaSc ₂ O ₄ : Eu ²⁺ , (Ba, Sr) ₂ SiO ₄ : Eu ²⁺ , Ba ₃ Si ₆ O ₁₂ N ₂ : Eu ²⁺ , (Si, Al) ₆ (O , N) ₈ : Eu ²⁺ or the like.

As the phosphor, those in which these phosphor powders are dispersed in glass, a glass phosphor in which a luminescent center ion is added to a glass matrix, a phosphor ceramic not including a binding member such as a resin, and the like can be used. . As a specific example of the phosphor powder dispersed in glass, the phosphor powder having the composition listed above is contained in a glass containing components such as P ₂ O ₃ , SiO ₂ , B ₂ O ₃ , and Al ₂ O _3. Are dispersed. Examples of glass phosphors in which a luminescent center ion is added to a glass matrix include Ca—Si—Al—O—N and Y—Si—Al—O—N systems in which Ce ³⁺ or Eu ²⁺ is added as an activator. Examples thereof include oxynitride glass phosphors. Examples of the phosphor ceramic include a sintered body having a phosphor composition having the composition listed above and substantially not including a resin component. Among these, it is desirable to use a phosphor ceramic having translucency. This is a phosphor ceramic that has translucency because there are almost no pores or impurities at grain boundaries that cause light scattering in the sintered body. Since pores and impurities can also prevent thermal diffusion, translucent ceramics exhibit high thermal conductivity. For this reason, when used as a phosphor layer, excitation light and fluorescence can be taken out from the phosphor layer without being lost by diffusion, and heat generated in the phosphor layer can be efficiently dissipated. Even a sintered body that does not show translucency is desirable to have as few pores and impurities as possible. As an index for evaluating the remaining amount of pores, the value of specific gravity of the phosphor ceramic can be used, and it is desirable that the value is 95% or more with respect to the theoretical value by which the value is calculated.

Here, a method of manufacturing a phosphor ceramic having translucency will be described by taking as an example a Y ₃ Al ₅ O ₁₂ : Ce ³⁺ phosphor which is a blue-excited yellow light-emitting phosphor. The phosphor ceramic is manufactured through a starting material mixing step, a forming step, a firing step, and a processing step. As the starting material, an oxide of a constituent element of Y ₃ Al ₅ O ₁₂ : Ce ³⁺ phosphor such as yttrium oxide, cerium oxide, or alumina, or a carbonate, nitrate, sulfate, or the like that becomes an oxide after firing is used. The particle size of the starting material is preferably a submicron size. These raw materials are weighed so as to have a stoichiometric ratio. At this time, for the purpose of improving the transmittance of the ceramic after firing, it is also possible to add a compound such as calcium or silicon. The weighed raw materials are sufficiently dispersed and mixed by a wet ball mill using water or an organic solvent. Next, the mixture is formed into a predetermined shape. As the molding method, a uniaxial pressing method, a cold isostatic pressing method, a slip casting method, an injection molding method, or the like can be used. The obtained molded body is fired at 1600 to 1800 ° C. Thus, translucent ^{_{Y 3 Al 5 O 12: Ce}} 3+ phosphor ceramic can be obtained.

  The phosphor ceramic produced as described above is polished to a thickness of several tens to several hundreds of μm using an automatic polishing apparatus and the like, and is further rounded by dicing or scribing using a diamond cutter or laser. Cut out to a board of any shape such as a square, fan or ring.

  Here, phosphor ceramics have a high refractive index with respect to air, and there are few things that cause scattering such as pores inside, and light is guided inside the ceramics. The light emission component emitted from the side surface increases, and the light emission component emitted in the front direction decreases. In order to solve this problem, the light emission component emitted in the front direction can be increased by providing an uneven light extraction structure by etching on the ceramic surface, mounting a lens, or providing a reflective layer on the side surface. Is also possible.

  In the light source device of the present invention, the plurality of solid light sources and the plurality of reflecting mirrors are arranged rotationally symmetrically with respect to a predetermined symmetry axis. For example, as in the example described later, the plurality of solid state light sources and the plurality of reflecting mirrors are arranged three by three at intervals of 120 ° around a predetermined symmetry axis, or centered on a predetermined symmetry axis. Four pieces are arranged at intervals of 90 °. In addition to these examples, various arrangements can be employed. That is, the plurality of solid-state light sources and the plurality of reflecting mirrors may be arranged in any number and arrangement as long as a predetermined number is arranged at predetermined angular intervals around a predetermined axis of symmetry. it can.

  In the light source device of the present invention, each of the solid light sources has a main optical axis C. As shown in FIG. 2, a predetermined symmetry axis A is provided on the side opposite to the side where the phosphor is disposed. The main optical axis C is arranged so as to emit light at an angle θ within 90 °.

  Further, in the light source device of the present invention, each reflecting mirror corresponding to each solid light source has a reflecting surface as a part of a spheroid including an angular range of the emitted light from each solid light source, The light emitting unit of each solid-state light source is disposed at the first focal point of a spheroid that constitutes the reflecting surface of each reflecting mirror, and the at least one phosphor is a spheroid that constitutes the reflecting surface of each reflecting mirror. Of the second focus.

  That is, when the plurality of solid light sources and the plurality of reflecting mirrors are arranged three by 120 at intervals of 120 ° around a predetermined axis of symmetry, the reflecting surfaces of the plurality of (three) reflecting mirrors are When configured as a part of three spheroids, and when each of the plurality of solid light sources and the plurality of reflecting mirrors are arranged four by 90 ° about a predetermined axis of symmetry The reflecting surfaces of the (four) reflecting mirrors are configured as a part of four spheroids. At this time, the light emitting portion of each solid light source is disposed at the first focal point of each spheroid, and at least one phosphor is disposed at the second focal point of each spheroid.

  3 (a), 3 (b), and 3 (c), the plurality of solid state light sources and the plurality of reflecting mirrors are arranged three by three at intervals of 120 ° around a predetermined axis of symmetry. An example of at least one phosphor is shown. In the example of FIGS. 3A and 3B, a case where one phosphor (common phosphor) 2 is used as at least one phosphor is shown. In this case, the case of FIG. In this way, excitation light from a plurality of (three) solid light sources can be condensed at substantially the same position P0 of one phosphor (common phosphor) 2 by a plurality of (three) reflectors, or As shown in FIG. 3B, excitation light from a plurality of (three) solid-state light sources is placed at a position P1, which is slightly separated from one phosphor (common phosphor) 2 by a plurality of (three) reflectors. It can also be condensed on P2 and P3.

  Here, in the example of FIGS. 3A and 3B, when a plurality of (three) solid light sources emit ultraviolet light, one phosphor 2 is, for example, blue, green, red, or the like. Among these phosphors, at least one kind of phosphor is included. When a plurality of (three) solid-state light sources emit ultraviolet light, when one phosphor 2 includes, for example, blue, green, and red phosphors (blue, green, and red phosphors) For example, when each of these is uniformly dispersed and mixed), when one phosphor 2 is irradiated with ultraviolet light from a plurality of (three) solid light sources, white light or the like can be obtained. it can. In addition, when the plurality of (three) solid light sources emit blue light as visible light, the phosphor layer 2 includes, for example, at least one kind of phosphor among phosphors such as green, red, and yellow Is included. When a plurality of (three) solid light sources emit blue light as visible light, when one phosphor 2 includes, for example, green and red phosphors (of green and red phosphors) When each of them is uniformly dispersed and mixed, for example, white light can be obtained when irradiating one phosphor 2 with blue light from a plurality of (three) solid light sources. . Further, when a plurality of (three) solid light sources emit blue light as visible light, when one phosphor 2 includes only a yellow phosphor, for example, a plurality of (three) When irradiating one phosphor 2 with blue light from a solid light source, white light or the like can be obtained.

  In the example of FIG. 3C, a case where three phosphors 2a, 2b, and 2c are used as at least one phosphor is shown. In this case, a plurality of (three) solid light sources are used. The excitation light can also be condensed at positions P4, P5 and P6 of the three phosphors 2a, 2b and 2c by a plurality of (three) reflecting mirrors. Here, as the three phosphors 2a, 2b, and 2c, different types of phosphors (for example, a red phosphor, a green phosphor, and a blue phosphor) can be used, and the three phosphors 2a, 2b, 2c, when a red phosphor, a green phosphor, and a blue phosphor are used, a light emitting diode that emits near-ultraviolet light having an emission wavelength of about 380 nm to about 400 nm as a plurality of (three) solid light sources, A semiconductor laser or the like can be used, and at this time, white light can be emitted as a whole.

  In any case, in the present invention, a plurality of solid light sources that emit light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and the plurality of solid light sources that are excited by light from the plurality of solid light sources. At least one phosphor that emits fluorescence having a wavelength longer than the light emission wavelength of the light source and the plurality of solid light sources are provided in correspondence with each other, and light from the plurality of solid light sources is reflected to the at least one phosphor Because it has a plurality of reflecting mirrors that collect light, light from a plurality of solid-state light sources can be condensed on at least one phosphor, which can further increase brightness It becomes.

  Next, the light source device of the present invention will be described more specifically.

  4 (a), 4 (b), and 4 (c) are diagrams showing a first specific example of the light source device of the present invention, FIG. 4 (a) is a perspective view, and FIG. 4 (b) is FIG. ) Is a plan view when viewed from the direction of a predetermined symmetry axis (arrow) A, and FIG. 4C is a cross-sectional view taken along the line BB of FIG. 4A, 4B, and 4C, reference numerals 5a, 5b, and 5c are three solid-state light sources (semiconductor light sources), reference numerals 4a, 4b, and 4c are three reflecting mirrors, and reference numeral 2 is One phosphor (common phosphor), and reference numerals 6a, 6b, and 6c are phosphor support members.

  4A, 4B, and 4C, three solid-state light sources (semiconductor light sources) 5a, 5b, and 5c are arranged at intervals of 120 ° about a predetermined symmetry axis A, respectively. Yes. The light emission directions from the respective solid-state light sources (semiconductor light sources) 5a, 5b, and 5c are directions toward the corresponding reflecting mirrors 4a, 4b, and 4c, respectively, and FIGS. 4 (a), 4 (b), and 4 (c). In this example, the main optical axis C of each solid light source 5a, 5b, 5c makes an angle θ of about 45 ° (see FIG. 2) with respect to a predetermined symmetry axis A.

  The solid-state light sources (semiconductor light sources) 5a, 5b, and 5c are supplied with necessary currents through a power feeding unit (not shown), and the solid-state light sources (semiconductor light sources) 5a, 5b, and 5c are respectively corresponding reflections. After being positioned precisely with respect to the mirrors 4a, 4b, 4c, they are attached to fixing and heat radiating members (not shown).

  Each of the reflecting mirrors 4a, 4b, and 4c has a sectioned reflecting surface disposed so as to face the corresponding solid-state light source (semiconductor light source) 5a, 5b, and 5c, respectively. The three divisional reflecting surfaces) share the position of each solid-state light source (semiconductor light source) 5a, 5b, 5c as a first focal point and the position on the phosphor 2 arranged on a predetermined symmetry axis A as a second focal point. It is a spheroid.

  In addition, the phosphor 2 is disposed on the second focal point of the sectional reflecting surfaces of the reflecting mirrors 4a, 4b, and 4c, and the phosphor supporting member 6a is disposed along the boundary line of the three sectional reflecting surfaces disposed in a rotationally symmetrical manner. , 6b, 6c are supported by a fixed portion (not shown). The phosphor support members 6a, 6b, and 6c are effective for heat dissipation of the phosphor 2 by using a material such as metal, for example.

  In the light source device shown in FIGS. 4A, 4B, and 4C, the phosphor 2 emits light from each of the three solid light sources (semiconductor light sources) 5a, 5b, and 5c. The light rays reflected and condensed by the reflection surfaces 4b and 4c (three reflection surfaces) are incident, and are converted in wavelength by the phosphor 2 to be emitted and output. Thus, since the light collected by the three reflecting surfaces is incident on the phosphor 2 (because the light from the three solid-state light sources 5a, 5b, and 5c can be collected), Compared to this, it is possible to further increase the brightness.

  FIGS. 5A, 5B, and 5C are views showing a second specific example of the light source device of the present invention. FIG. 5A is a perspective view, and FIG. 5B is FIG. FIG. 5A is a plan view when (a) is viewed from the direction of a predetermined symmetry axis (arrow) A, and FIG. 5C is a cross-sectional view taken along the line BB of FIG. In FIGS. 5A, 5B, and 5C, reference numerals 5a, 5b, 5c, and 5d are four solid light sources (semiconductor light sources), and reference numerals 4a, 4b, 4c, and 4d are four reflecting mirrors. Reference numeral 2 denotes one phosphor (common phosphor), and reference numerals 6a, 6b, 6c, and 6d denote phosphor support members.

  5A, 5B, and 5C, four solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are arranged at intervals of 90 ° about a predetermined symmetry axis A, respectively. Has been. The light emission directions from the respective solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are directions toward the corresponding reflecting mirrors 4a, 4b, 4c, and 4d, respectively. In the example of (c), the main optical axis C of each solid light source 5a, 5b, 5c, 5d makes an angle θ of about 45 ° (see FIG. 2) with respect to a predetermined symmetry axis A.

  The solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are supplied with necessary currents through a power feeding unit (not shown), and the solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are respectively Are precisely positioned with respect to the reflecting mirrors 4a, 4b, 4c, and 4d, and are attached to fixing and heat radiating members (not shown).

  Moreover, each reflecting mirror 4a, 4b, 4c, 4d has the division | segmentation reflective surface arrange | positioned so as to oppose each solid light source (semiconductor light source) 5a, 5b, 5c, 5d corresponding to each, The section reflection surfaces (four section reflection surfaces) are positions of the solid light sources (semiconductor light sources) 5a, 5b, 5c, and 5d on the first focal point and the positions on the phosphor 2 arranged on the predetermined symmetry axis A. It is a spheroid shared as the second focal point.

  In addition, the phosphor 2 is disposed on the second focal point of the sectional reflecting surfaces of the reflecting mirrors 4a, 4b, 4c, and 4d, and supports the phosphor along the boundary lines of the four sectional reflecting surfaces disposed in a rotationally symmetrical manner. The member 6a, 6b, 6c, 6d is supported by a fixed portion (not shown). The phosphor support members 6a, 6b, 6c, and 6d are effective for heat dissipation of the phosphor 2 by using a material such as metal, for example.

  In the light source device shown in FIGS. 5A, 5B, and 5C, the phosphor 2 emits light from each of the four solid light sources (semiconductor light sources) 5a, 5b, 5c, and 5d. Light beams reflected and condensed by the reflecting surfaces 4a, 4b, 4c, and 4d (four reflecting surfaces) are incident, and are converted in wavelength by the phosphor 2 to be emitted and output. Thus, since the light rays collected by the four reflecting surfaces are incident on the phosphor 2 (because the light from the four solid light sources 5a, 5b, 5c, 5d can be condensed), It is possible to further increase the brightness as compared with the prior art.

  FIGS. 6A, 6B, and 6C are views showing a third specific example of the light source device of the present invention. FIG. 6A is a perspective view, and FIG. 6B is FIG. FIG. 6A is a plan view when (a) is viewed from the direction of a predetermined axis of symmetry (arrow) A, and FIG. 6C is a cross-sectional view taken along line BB in FIG. In FIGS. 6A, 6B, and 6C, reference numerals 5a, 5b, 5c, and 5d are four solid light sources (semiconductor light sources), and reference numerals 4a, 4b, 4c, and 4d are four reflectors. Reference numeral 2 denotes one phosphor (common phosphor). 6A, 6B, and 6C, the phosphor support member is not shown.

  The light source device of the third specific example is obtained by changing the positional relationship between the reflecting mirrors 4a, 4b, 4c, 4d and the phosphor 2 with respect to the light source device of the second specific example. That is, in the light source device of FIGS. 6A, 6B, and 6C, four solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are spaced by 90 ° about a predetermined symmetry axis A. Each is arranged. The light emission directions from the respective solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are directions toward the corresponding reflecting mirrors 4a, 4b, 4c, and 4d, respectively. In the example of b) and (c), the main optical axis C of each solid light source 5a, 5b, 5c, 5d makes an angle θ of about 13 ° (see FIG. 2) with respect to a predetermined symmetry axis A.

  The solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are supplied with necessary currents through a power feeding unit (not shown), and the solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are respectively Are precisely positioned with respect to the reflecting mirrors 4a, 4b, 4c, and 4d, and are attached to fixing and heat radiating members (not shown).

  Moreover, each reflecting mirror 4a, 4b, 4c, 4d has the division | segmentation reflective surface arrange | positioned so as to oppose each solid light source (semiconductor light source) 5a, 5b, 5c, 5d corresponding to each, The section reflection surfaces (four section reflection surfaces) are positions of the solid light sources (semiconductor light sources) 5a, 5b, 5c, and 5d on the first focal point and the positions on the phosphor 2 arranged on the predetermined symmetry axis A. It is a spheroid shared as the second focal point.

  In the light source device of FIGS. 6A, 6B, and 6C, the phosphor 2 is emitted from each of the four solid light sources (semiconductor light sources) 5a, 5b, 5c, and 5d, and each of the four reflecting mirrors. Light beams reflected and condensed by the reflecting surfaces 4a, 4b, 4c, and 4d (four reflecting surfaces) are incident, and are converted in wavelength by the phosphor 2 to be emitted and output. Thus, since the light rays collected by the four reflecting surfaces are incident on the phosphor 2 (because the light from the four solid light sources 5a, 5b, 5c, 5d can be condensed), It is possible to further increase the brightness as compared with the prior art.

  FIGS. 7A, 7B, and 7C are views showing a fourth specific example of the light source device of the present invention. FIG. 7A is a perspective view, and FIG. FIG. 7A is a plan view when (a) is viewed from the direction of a predetermined symmetry axis (arrow) A, and FIG. 7C is a cross-sectional view taken along line BB in FIG. 7B. In FIGS. 7A, 7B, and 7C, reference numerals 5a, 5b, 5c, and 5d are four solid light sources (semiconductor light sources), and reference numerals 4a, 4b, 4c, and 4d are four reflecting mirrors. Reference numeral 2 denotes one phosphor (common phosphor). 7A, 7B, and 7C, the phosphor support member is not shown.

  The light source device of the fourth specific example is obtained by changing the positional relationship between the reflecting mirrors 4a, 4b, 4c, 4d and the phosphor 2 with respect to the light source device of the second specific example. That is, in the light source device of FIGS. 7A, 7B, and 7C, four solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are spaced at 90 ° intervals about a predetermined symmetry axis A. Each is arranged. The light emission directions from the respective solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are directions corresponding to the corresponding reflecting mirrors 4a, 4b, 4c, and 4d, respectively. In the examples of b) and (c), the main optical axis C of each solid light source 5a, 5b, 5c, 5d makes an angle θ of approximately 22 ° (see FIG. 2) with respect to a predetermined symmetry axis A.

  The solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are supplied with necessary currents through a power feeding unit (not shown), and the solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d are respectively Are precisely positioned with respect to the reflecting mirrors 4a, 4b, 4c, and 4d, and are attached to fixing and heat radiating members (not shown).

  Moreover, each reflecting mirror 4a, 4b, 4c, 4d has the division | segmentation reflective surface arrange | positioned so as to oppose each solid light source (semiconductor light source) 5a, 5b, 5c, 5d corresponding to each, The section reflection surfaces (four section reflection surfaces) are positions of the solid light sources (semiconductor light sources) 5a, 5b, 5c, and 5d on the first focal point and the positions on the phosphor 2 arranged on the predetermined symmetry axis A. It is a spheroid shared as the second focal point.

  In the light source device of FIGS. 7A, 7B, and 7C, the phosphor 2 is emitted from each of the four solid-state light sources (semiconductor light sources) 5a, 5b, 5c, and 5d. Light beams reflected and condensed by the reflecting surfaces 4a, 4b, 4c, and 4d (four reflecting surfaces) are incident, and are converted in wavelength by the phosphor 2 to be emitted and output. Thus, since the light rays collected by the four reflecting surfaces are incident on the phosphor 2 (because the light from the four solid light sources 5a, 5b, 5c, 5d can be condensed), It is possible to further increase the brightness as compared with the prior art.

  As described above, according to the present invention, the excitation light from each of the plurality of solid state light sources (semiconductor light sources) is condensed on the phosphor, so that the emission luminance is higher than that in the case of a single solid state light source (semiconductor light source). Can be further improved.

  Further, by combining the above-described light source device of the present invention with an optical component such as a predetermined lens system, an illumination device capable of increasing the brightness can be provided.

  The present invention can be used for vehicle lighting such as headlamps and general lighting.

2, 2a, 2b, 2c phosphor 4a, 4b, 4c, 4d reflecting mirror 5a, 5b, 5c, 5d solid light source 6a, 6b, 6c, 6d phosphor support member

Claims (4)

A plurality of solid-state light sources that emit light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a wavelength longer than the emission wavelength of the plurality of solid-state light sources excited by light from the plurality of solid-state light sources At least one phosphor that emits fluorescence, and a plurality of reflecting mirrors provided corresponding to the plurality of solid light sources, respectively, for reflecting and condensing light from the plurality of solid light sources to the at least one phosphor; A light source device comprising: 2. The light source device according to claim 1, wherein the plurality of solid state light sources and the plurality of reflecting mirrors are arranged rotationally symmetrically with respect to a predetermined symmetry axis. 3. The light source device according to claim 1, wherein each of the solid light sources has a main optical axis, and the main light with respect to a predetermined symmetry axis on the side opposite to the side where the phosphor is disposed. Each of the reflecting mirrors that emit light at an angle of 90 ° or less and that corresponds to each of the solid light sources is a reflective surface as a part of a spheroid including the angle range of the emitted light from each of the solid light sources. The light emitting part of each solid-state light source is disposed at the first focal point of a spheroid that constitutes the reflecting surface of each reflecting mirror, and the at least one phosphor has a reflecting surface of each reflecting mirror. A light source device arranged at a second focal point of a spheroid constituting the same. An illumination device using the light source device according to claim 1.

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