JP2013172084A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for preventing color shade by a simple optical system, in a luminaire using a semiconductor light-emitting element and a phosphor.SOLUTION: An optical system comprises a diffusion lens 2 and an imaging lens 3 disposed in order from the semiconductor light-emitting element 1 side. A phosphor being excited by the light 11 emitted from the semiconductor light-emitting element is contained in the diffusion lens 2. The diffusion lens 2 diffuses the light 11 emitted from the semiconductor light-emitting element 1, and the imaging lens 3 forms the image of fluorescent light 12 and the light 11 emitted from the semiconductor light-emitting element. Since the fluorescent light 12 passes only through the imaging lens 3, although the light 11 emitted from the semiconductor light-emitting element passes through the diffusion lens 2 and the imaging lens 3, the fluorescent light 12 and the light 11 emitted from the semiconductor light-emitting element having different wavelengths can be imaged at the same focal point.

Description

  The present invention relates to an illuminating device using a semiconductor light emitting element, and more particularly to a technology for preventing color unevenness of an illuminating device that converts a part of light of a light source using a phosphor.

  In recent years, with the increase in luminance of semiconductor light emitting devices such as LEDs and LDs, application development is rapidly progressing from conventional display use to illumination use. Since the semiconductor light emitting device is a monochromatic light source, it is used in combination with a wavelength conversion device such as a phosphor to convert a part of the wavelength of the emitted light from the semiconductor light emitting device and mix the emitted light to obtain white light. ing. For example, a part of light emitted from a blue LED is converted into yellow light by a phosphor, and blue light and yellow light are mixed to obtain white light. However, when trying to collect white light, which is a mixture of blue light and yellow light, with the lens, chromatic aberration occurs between the blue light and the yellow light due to the wavelength dependence of the refractive index of the lens. In addition, blue light is emitted at a predetermined spread angle due to the directivity of the LED, whereas yellow light emitted from the phosphor has a large spread angle because it is emitted from every position in the phosphor. Due to these problems, there is a problem that color dispersion (color unevenness) occurs in the irradiated image.

  In order to solve this problem, in Patent Document 1, a collar-shaped portion is provided around the convex lens, yellow light spreading around the convex lens is reflected toward the center by the collar-shaped portion, and is mixed with blue light and white light at the center. Thus, an illumination device that reduces color unevenness is disclosed. Patent Document 2 discloses an illumination device that emits blue light and yellow light from the end face of a rod lens and uniformizing them by multiple reflection inside.

JP 2005-216682 A JP 2005-339853 A

  In the illumination device disclosed in Patent Document 1 described above, it is necessary to design and manufacture a lens having a complicated shape having a collar portion, and the structure becomes complicated. In addition, when the emission wavelength or fluorescence wavelength of the semiconductor light emitting element is changed, it is necessary to redesign the lens each time, which increases costs.

  In the illumination device disclosed in Patent Document 2, in order to completely mix blue light and yellow light with a rod lens, a rod lens having a length several times or more the thickness of the semiconductor light emitting element is required. The size of the device increases. Further, since the light emitted from the rod lens is collimated light, a condensing optical system is further required when condensing light.

  In order to eliminate chromatic aberration in the lens, it is conceivable to construct all optical systems with mirrors. However, in order to obtain a desired irradiation image, a complicated mirror optical system is required.

  An object of the present invention is to provide a technique for preventing chromatic dispersion with a simple optical system in an illumination device using a semiconductor light emitting element and a phosphor.

  In order to achieve the above object, according to the present invention, a semiconductor light emitting device, a phosphor that is excited by light emitted from the semiconductor light emitting device and emits fluorescence, and the light emitted from the semiconductor light emitting device and the fluorescence are collected. The illumination system includes an optical system, and the optical system includes a diffusion lens and an imaging lens that are sequentially arranged from the semiconductor light emitting element side. The diffusion lens diffuses the light emitted from the semiconductor light emitting element, and the imaging lens forms an image of the fluorescent light and the light emitted from the semiconductor light emitting element diffused by the diffusion lens. The diffusion lens contains a phosphor inside.

  In the present invention, chromatic dispersion can be prevented with a simple optical system in a lighting device using a semiconductor light emitting element and a phosphor.

It is a block diagram which shows typically the structure and optical path of the illuminating device of 1st Embodiment. (A) is a perspective view of the optical system of the illuminating device of FIG. 1, (b) is the sectional drawing. It is sectional drawing which shows the example which comprised the optical system of the illuminating device of 1st Embodiment with the single-sided lens. It is a block diagram which shows the structure and optical path of the illuminating device of 2nd Embodiment. (A) is a perspective view of the optical system of the illuminating device of FIG. 4, (b) is the sectional drawing. It is a block diagram which shows the structure and optical path of the illuminating device of 3rd Embodiment. It is a block diagram which shows the structure and optical path of the illuminating device of 4th Embodiment.

  In the present invention, the light emitted from the semiconductor light emitting element and the fluorescence emitted from the phosphor are condensed at the same focal point, thereby preventing color dispersion (color unevenness) on the irradiated surface. In general, since the emitted light of the semiconductor light emitting element has a shorter wavelength than the fluorescence, the refraction angle in the optical system is large. For this reason, when passing through the imaging lens, the light emitted from the semiconductor light emitting element has a shorter focal point than the phosphor, resulting in chromatic dispersion.

  Therefore, in the present invention, only the emitted light of the semiconductor light emitting element is made long-focused using a diffusion lens. The phosphor is arranged closer to the coupling lens than the diffusing lens, or the diffusing lens itself is configured to include the phosphor.

  As a result, the emitted light of the semiconductor light emitting element passes through the diffusion lens and the imaging lens, whereas the fluorescence passes only through the imaging lens. It is possible to form an image at the same focal point.

  When the imaging lens is a convex lens, the diffusion lens is a concave lens. In an optical system using a concave mirror, when the imaging lens is a concave lens, the diffusing lens is a convex lens. The imaging lens and the diffusing lens may each be composed of a plurality of lenses.

  Hereinafter, embodiments of the present invention will be specifically described.

(First embodiment)
A lighting apparatus according to the first embodiment will be described with reference to FIGS. 1 and 2A and 2B. FIG. 1 is a block diagram schematically showing a configuration and an optical path of the illumination device according to the first embodiment. FIG. 2A is a perspective view of the optical system, and FIG. 2B is a cross section of the optical system. FIG. 1 and 2, the shape of the semiconductor light emitting element 1 and the lens shape such as the thickness and curvature of the optical system are schematically shown, and the actual lens shape is not accurately represented. Absent.

  The illumination device includes a semiconductor light emitting element 1 and an optical system. The optical system includes a diffusing lens 2 and an imaging lens 3 arranged in order from the semiconductor light emitting element 1 side. The diffusion lens 2 uses a concave lens, and the imaging lens 3 uses a convex lens. Each of the concave lens and the convex lens may be composed of a plurality of lenses.

  The diffusion lens 2 is made of a material containing a phosphor. Note that the phosphor-containing material mentioned here includes a phosphor single crystal. When the diffusing lens 2 is composed of a plurality of lenses, it is sufficient that at least one lens is made of a material containing a phosphor.

  The operation of each part of the lighting device will be described. The light 11 emitted from the semiconductor light emitting element 1 is refracted and diffused by the diffusion lens 2 in the direction outside the optical axis 13. Further, inside the diffusing lens 2, the phosphor absorbs a part of the emitted light 11 of the semiconductor light emitting element 1 and is excited to emit fluorescence 12.

  The imaging lens 3 forms an image on the irradiation surface 4 of the fluorescence 12 generated inside the diffusion lens 2 and the emitted light 11 of the semiconductor light emitting element 1 diffused outward by the diffusion lens 2.

  The emitted light 11 of the semiconductor light emitting element 1 having a shorter wavelength than the fluorescence 12 is refracted more largely than the fluorescence 12 in the imaging lens 3. For this reason, when the imaging lens 3 is used alone, the emitted light 11 forms an image before the fluorescence 12 (on the side of the semiconductor light emitting element 1), but in this embodiment, the emitted light 11 is emitted by the diffusing lens 2. Since only the light is once diffused outward, the emitted light 11 can be imaged on the same irradiation surface 4 as the fluorescence 12.

  Specifically, the emitted light 11 and the fluorescent light 12 are set so that the focal position of the optical system including the diffusion lens 2 and the imaging lens 3 with respect to the emitted light 11 coincides with the focal position of the imaging lens 3 with respect to the fluorescent light 12. The curvature of the lens surface and the distance between the imaging lens 3 and the imaging lens 3 may be designed in consideration of the wavelength of the light and the refractive indexes of the diffusion lens 2 and the imaging lens 3.

For example, as the semiconductor light emitting element 1, an LED that emits blue light can be used. Examples of phosphors that emit yellow light using blue light as excitation light, such as YAG phosphors, garnet phosphors, orthosilicate phosphors, SiAlON phosphors, CaSiN ₂ phosphors, and oxynitride phosphors Use. Thereby, the illuminating device which irradiates white light can be obtained.

  The diffusing lens 2 desirably emits fluorescence and does not scatter the emitted light 11 of the semiconductor light emitting element 11 inside. Therefore, the diffusing lens 2 is formed of any one of a phosphor single crystal, a phosphor glass containing a phosphor as a component, a phosphor ceramic containing a phosphor as a component, and a transparent body in which the phosphor is dispersed. Can be used.

  When the diffusing lens 2 is formed of a single crystal of phosphor, it is most preferable to form the diffusing lens 2 with a single single crystal having no grain boundary, but it is divided into several single crystals depending on the grain boundary. Is also acceptable. For example, the diffusing lens 2 can be composed of a YAG single crystal.

  A fluorescent glass containing a phosphor as a component is a glass produced by melting a material containing an element constituting the phosphor, and contains a fluorescent active element as a part of the glass component. For example, as the fluorescent glass, a glass containing terbium, europium, cerium, samarium, or the like as a fluorescent active element, such as Lumilas G9 (green) or Lumilas R7 (red) manufactured by Sumita Optical Glass Co., Ltd. can be used.

  A fluorescent ceramic containing a phosphor as a component is manufactured by mixing and sintering a material powder containing an element constituting the phosphor. A crystal structure without grain boundaries is preferred. For example, as a fluorescent ceramic, sapphire as a base material can be used.

  The transparent body in which the phosphor is dispersed is obtained by dispersing phosphor fine particles on a base material transparent to the emitted light 11. In order to prevent scattering of the emitted light 11 (Mie scattering) by the phosphor fine particles, the particle diameter of the phosphor fine particles is preferably smaller than the wavelength of the emitted light 11. The base material may be an inorganic material such as glass or an organic material such as a resin. The phosphor-dispersed glass is, for example, a method in which a glass powder having a predetermined particle diameter and a phosphor powder are mixed and heated, or a sol-gel that is heated after drying and gelating a glass sol in which a glass raw material and phosphor particles are mixed. It can be manufactured by the method. The phosphor-dispersed resin can be produced by mixing phosphor particles in a resin, resin precursor powder, melt or solution and heating.

  The phosphor single crystal, the phosphor glass, the phosphor ceramic, and the phosphor-dispersed transparent body may be processed into a shape of the diffusing lens 2 having a predetermined curvature by polishing or molding using a mold. it can.

  As described above, in the present embodiment, the emission light 11 from the semiconductor light emitting element 1 and the fluorescence 12 from the phosphor in the diffusion lens 2 are made identical by a simple optical system in which the diffusion lens 2 and the imaging lens 3 are combined. An image can be formed on the irradiation surface 4. Therefore, it is possible to prevent the emission light 11 and the fluorescence 12 from being dispersed in the irradiation image to prevent color unevenness. Since the diffusing lens and the imaging lens 3 are a concave lens and a convex lens, the degree of freedom of the irradiation image on the irradiation surface can be maintained by these designs.

  Here, a method for designing the radius of curvature of the diffusing lens 2 and the imaging lens 3 will be briefly described. As an example, as shown in FIG. 3, a case will be described in which both the diffusion lens 2 and the imaging lens 3 are single-sided lenses, and the distance between the diffusion lens 2 and the imaging lens 3 is zero (in close contact).

In general, the relationship between the focal length f, the refractive index n, and the curvature radius r of a lens is expressed by the following equation (1).
Holds.
1 / f = (n−1) / r (1)

In the present embodiment, the focal length f of the optical system including the diffusing lens 2 and the imaging lens 3 with respect to the emitted light 11 of the semiconductor light emitting element 1 and the focal length f of the imaging lens 3 with respect to the fluorescence 12 match. Therefore, the radius of curvature may be determined so that the following formula (2) is satisfied.
(n _2b −1) / r ₂ + (n _3b −1) / r ₃ = 1 / f = (n _3y −1) / r ₃ (2)

In Equation (2), n _2b is the refractive index of the diffuser lens 2 with respect to the emitted light (for example, blue) 11 of the semiconductor light emitting element 1, r ₂ is the radius of curvature of the diffuser lens 2, and n _3b is the imaging lens. 3 is the refractive index of the semiconductor light emitting element 1 with respect to the emitted light (for example, blue) 11, r ₃ is the radius of curvature of the imaging lens 3, and n _3y is the refractive index of the imaging lens 3 with respect to the fluorescence (for example, yellow) 12. .

  Although FIG. 1 to FIG. 3 show examples in which the lens diameters of the diffusion lens 2 and the imaging lens 3 are the same, the present invention is not limited to this. By making the imaging lens 3 larger than the diffusion lens 2, the fluorescence 12 emitted from the phosphor in the diffusion lens 2 to Lambertian and the emitted light 11 of the semiconductor light emitting device 1 diffused outward by the diffusion lens 2. Is preferably incident on the imaging lens 3 to form an image.

(Second Embodiment)
A lighting device according to a second embodiment will be described with reference to FIGS. 4 and 5A and 5B. FIG. 4 is a block diagram schematically showing a configuration and an optical path of the illumination device of the second embodiment. FIG. 5A is a perspective view of the optical system, and FIG. 5B is a cross section of the optical system. FIG. The lens shape in FIG. 5 is schematic and does not accurately represent the actual lens shape.

  This illumination device has the same configuration as that of the first embodiment, but in the first embodiment, the diffusing lens 2 including the phosphor is used, whereas in the second embodiment, the phosphor is used. The phosphor layer 22 is disposed on the surface of the diffusing lens 21 that does not contain the light. The phosphor layer 22 is disposed on the surface of the diffusion lens 21 on the imaging lens 3 side. In the example of FIG. 4, the phosphor layer 22 covers the entire surface of the diffusion lens 21 on the imaging lens 3 side, but a configuration in which the phosphor layer 22 is disposed only on a part of the surface may be employed. Other configurations are the same as those of the first embodiment.

  It is desirable that the phosphor layer 22 emits fluorescence and does not scatter the emitted light 11 of the semiconductor light emitting element 11 inside. Therefore, the phosphor layer 22 is either a phosphor single crystal or a phosphor glass containing a phosphor as a component, a phosphor ceramic containing a phosphor as a component, or a transparent body in which the phosphor is dispersed. Or a structure in which a plurality of these layers are stacked.

  The phosphor single crystal or the fluorescent glass containing the phosphor as a component, the phosphor ceramic containing the phosphor as a component, and the transparent body in which the phosphor is dispersed are described in the first embodiment. The thing similar to a thing can be used.

  In the second embodiment, the emitted light 11 of the semiconductor light emitting element 1 is refracted and diffused in the outer direction of the optical axis in the diffusion lens 2, passes through the phosphor layer 22, and enters the imaging lens 3. When passing through the phosphor 22, a part of the emitted light 11 of the semiconductor light emitting element 1 is absorbed by the phosphor, and the phosphor is excited to emit fluorescence 12. The fluorescence 12 is incident on the imaging lens 3.

  The imaging lens 3 images the fluorescence 12 and the emitted light 11 of the semiconductor light emitting element 1 diffused by the diffusion lens 2 on the irradiation surface 4. The emitted light 11 of the semiconductor light emitting element 1 having a shorter wavelength than the fluorescent light 12 is refracted more greatly than the fluorescent light 12 in the imaging lens 3, but is diffused in advance by the diffusion lens 2, and thus the same irradiation surface as the fluorescent light 12. 4 can image the emitted light 11.

  Other configurations and effects are the same as those of the first embodiment, and thus description thereof is omitted.

  In the present embodiment, the phosphor layer 22 is disposed on the surface of the diffusion lens 21, but the present invention is not limited to this configuration, and the phosphor layer is interposed between the diffusion lens 21 and the imaging lens 3. 22 should just be arrange | positioned. Therefore, the phosphor layer 22 can be arranged independently in the space between the diffusion lens 21 and the imaging lens 3 and covers at least a part of the surface of the imaging lens 3 on the diffusion lens 21 side. It is also possible to arrange them as follows.

(Third embodiment)
A lighting apparatus according to a third embodiment will be described with reference to FIG. FIG. 6 is a block diagram schematically illustrating a configuration and an optical path of the illumination device according to the third embodiment.

  The illumination device includes a semiconductor light emitting element 1 and an optical system. The optical system includes a convex lens 61 that functions as a diffusion lens, a concave lens 62 that functions as an imaging lens, and a concave mirror 63, which are arranged in order from the semiconductor light emitting element 1 side. The convex lens 61 and the concave lens 62 may each be composed of a plurality of lenses.

  Similar to the diffusing lens 2 of the first embodiment, the convex lens (diffusing lens) 61 is made of a phosphor single crystal or a material containing the phosphor. When the convex lens 61 is composed of a plurality of lenses, it is sufficient that at least one lens is made of a material containing a phosphor.

  The emitted light 11 of the semiconductor light emitting device 1 is refracted toward the optical axis 13 by the convex lens 61. Further, inside the convex lens 61, the phosphor absorbs a part of the emitted light 11 of the semiconductor light emitting element 1 and is excited to emit fluorescence 12.

  The concave lens 62 refracts and diffuses the fluorescence 12 generated inside the convex lens 61 and the emitted light 11 of the semiconductor light emitting element 1 refracted inward by the convex lens 61 toward the outside of the optical axis 13. At this time, the emitted light 11 of the semiconductor light emitting element 1 having a shorter wavelength than the fluorescence 12 is refracted to be larger than the fluorescence 12 in the concave lens 62, but only the emitted light 11 is refracted in the direction of the optical axis 13 by the convex lens 61 in advance. Therefore, the emitted light 11 and the fluorescence 12 can be imaged on the same irradiation surface 4 by the concave mirror 63.

  That is, in the optical system including the convex lens 61, the concave lens 62, and the concave mirror 63, the focal position of the concave lens 62 and the concave mirror 63 with respect to the fluorescent light 12 matches the focal position of the concave lens 62 and the concave mirror 63 with respect to the fluorescent light 12. In consideration of the wavelength, the curvature and refractive index of the convex lens 61 and the concave lens 62, the shape of the concave mirror 63, and the distance between them may be designed.

  As described above, in the present embodiment, the light irradiated from the semiconductor light emitting element 1 and the fluorescent light 12 from the phosphor in the convex lens 61 are irradiated on the same irradiation surface 4 by a simple optical system in which the convex lens 61, the concave lens 62, and the concave mirror 63 are combined. The effect of being able to form an image is obtained.

  FIG. 6 shows an example in which the lens diameters of the convex lens 61 and the concave lens 62 are the same, but the present invention is not limited to this. By making the concave lens 62 larger than the convex lens 61, fluorescence can be imaged more efficiently.

(Fourth embodiment)
A lighting device according to a fourth embodiment will be described with reference to FIG. FIG. 7 is a block diagram schematically illustrating a configuration and an optical path of the illumination device according to the fourth embodiment.

  This lighting device has the same configuration as that of the third embodiment, but in the third embodiment, a convex lens 61 including a phosphor is used, whereas in the fourth embodiment, a phosphor is used. The phosphor layer 22 is disposed on the surface of the convex lens 61 not included. The phosphor layer 22 is disposed on the surface of the convex lens 61 on the concave lens 62 side. In the example of FIG. 7, the phosphor layer 22 covers the entire surface of the convex lens 71 on the concave lens 62 side. However, the phosphor layer 22 may be disposed only on a part of the surface. Other configurations are the same as those of the third embodiment.

  It is desirable that the phosphor layer 22 emits fluorescence and does not scatter the emitted light 11 of the semiconductor light emitting element 11 inside. Similarly to the second embodiment, the phosphor layer 22 is a phosphor single crystal or phosphor glass containing a phosphor as a component, phosphor ceramic containing a phosphor as a component, and a phosphor dispersed therein. A single layer of the transparent body formed or a structure in which a plurality of these layers are laminated.

  In the fourth embodiment, the emitted light 11 of the semiconductor light emitting device 1 is refracted toward the optical axis 13 by the convex lens 61. The phosphor layer 22 absorbs a part of the emitted light 11 that has passed through the convex lens 61 and emits fluorescence 12.

  The concave lens 62 refracts the fluorescence 12 generated in the phosphor layer 22 and the emitted light 11 of the semiconductor light emitting element 1 refracted inward by the convex lens 61 toward the outside of the optical axis 13. At this time, the emitted light 11 of the semiconductor light emitting element 1 having a shorter wavelength than the fluorescence 12 is refracted to be larger than the fluorescence 12 in the concave lens 62, but only the emitted light 11 is refracted in the direction of the optical axis 13 by the convex lens 61 in advance. Accordingly, the concave mirror 63 can image the emitted light 11 and the fluorescence 12 on the same irradiation surface 4.

  Other configurations and effects are the same as those of the third embodiment, and thus description thereof is omitted.

  In the present embodiment, the phosphor layer 22 is disposed on the surface of the convex lens 71, but the present invention is not limited to this configuration, and may be disposed between the convex lens 71 and the concave lens 62. Therefore, the phosphor layer 22 can be disposed independently in the space between the convex lens 71 and the concave lens 62, or can be disposed so as to cover at least a part of the surface of the concave lens 62 on the convex lens 71 side. Is possible.

  Further, the present invention is not limited to the above-described embodiment. For example, a plurality of combinations of the diffusing lens and the imaging lens according to any one of the first to fourth embodiments may be arranged on the same optical axis, and each set of phosphors may emit different colors. By adopting such a configuration, for example, a blue excitation light source is used, and a part of this blue light is converted into fluorescence by a green phosphor and a red phosphor, respectively, thereby combining light in three wavelength ranges. A so-called three-wavelength type white light source can also be obtained.

  The illumination device of the present invention can be used as a vehicle illumination device such as a headlamp, a general illumination device, and a light source for a projection projector.

  DESCRIPTION OF SYMBOLS 1 ... Semiconductor light-emitting device, 2 ... Diffuse lens, 3 ... Imaging lens, 4 ... Irradiation surface, 11 ... Emitted light of semiconductor light-emitting device, 12 ... Fluorescence, 13 ... Optical axis, 21 ... Diffuse lens, 22 ... Phosphor layer , 61 ... convex lens, 62 ... concave lens, 63 ... concave mirror, 71 ... convex lens

Claims (9)

A semiconductor light-emitting element, a phosphor that is excited by light emitted from the semiconductor light-emitting element and emits fluorescence, and an optical system that collects the light emitted from the semiconductor light-emitting element and the fluorescence,
The optical system includes a diffusing lens and an imaging lens arranged in order from the semiconductor light emitting element side,
The diffusion lens diffuses the emitted light of the semiconductor light emitting element, and the imaging lens images the fluorescence and the emitted light of the semiconductor light emitting element diffused by the diffusion lens,
The illuminating device, wherein the phosphor is included in the diffuser lens.   2. The illumination device according to claim 1, wherein the diffusion lens includes a single crystal of the phosphor, a fluorescent glass containing the phosphor as a component, a phosphor ceramic containing the phosphor as a component, and the phosphor. An illuminating device characterized in that the illuminating device is formed of any one of transparent bodies dispersed therein. A semiconductor light-emitting element, a phosphor that is excited by light emitted from the semiconductor light-emitting element and emits fluorescence, and an optical system that collects the light emitted from the semiconductor light-emitting element and the fluorescence,
The optical system includes a diffusing lens and an imaging lens arranged in order from the semiconductor light emitting element side,
The diffusion lens diffuses the emitted light of the semiconductor light emitting element, and the imaging lens images the fluorescence and the emitted light of the semiconductor light emitting element diffused by the diffusion lens,
The illuminating device, wherein the phosphor is disposed between the diffusing lens and the imaging lens.   4. The illumination device according to claim 3, wherein the phosphor is arranged on at least one of a surface of the diffusion lens on the side of the coupling lens and a surface of the imaging lens on the side of the diffusion lens. A lighting device characterized by being a body layer. A semiconductor light-emitting element, a phosphor that is excited by light emitted from the semiconductor light-emitting element and emits fluorescence, and an optical system that collects the light emitted from the semiconductor light-emitting element and the fluorescence,
The optical system includes a convex lens, a concave lens, and a concave mirror arranged in order from the semiconductor light emitting element side,
The concave mirror images the fluorescence that has passed through the concave lens and the light emitted from the semiconductor light emitting element,
The illuminating device, wherein the phosphor is contained in the convex lens.   6. The illumination device according to claim 5, wherein the convex lens includes a single crystal of the phosphor, a fluorescent glass containing the phosphor as a component, a phosphor ceramic containing the phosphor as a component, and the phosphor. An illuminating device formed of any one of dispersed transparent bodies. A semiconductor light-emitting element, a phosphor that is excited by light emitted from the semiconductor light-emitting element and emits fluorescence, and an optical system that collects the light emitted from the semiconductor light-emitting element and the fluorescence,
The optical system includes a convex lens, a concave lens, and a concave mirror arranged in order from the semiconductor light emitting element side,
The concave mirror images the fluorescence that has passed through the concave lens and the light emitted from the semiconductor light emitting element,
The illuminating device, wherein the phosphor is disposed between the convex lens and the concave lens.   8. The illumination device according to claim 7, wherein the phosphor is a phosphor layer disposed on at least one of the concave lens side surface of the convex lens and the convex lens side surface of the concave lens. A lighting device characterized by the above.   The lighting device according to claim 4 or 8, wherein the phosphor layer includes a single crystal of the phosphor, a fluorescent glass containing the phosphor as a component, a phosphor ceramic containing the phosphor as a component, and An illuminating device, wherein the illuminating device is formed of any one of transparent bodies in which the phosphors are dispersed.

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