JP5530167B2 - Light source device and lighting device - Google Patents

Description

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

  A light source device combining an optical semiconductor such as an LED and a phosphor layer has been widely used. However, in recent years, the brightness has been increased, and its application range such as general lighting and automobile headlamps has been expanded. It is considered that such light source devices will continue to be widely used in various applications by increasing the luminance.

  As a means for increasing the brightness of a light source device combining such an optical semiconductor and a phosphor layer, it is conceivable to increase the excitation light intensity from the optical semiconductor by supplying a large current to the optical semiconductor. Heat is generated in the phosphor layer, and in the phosphor layer, the fluorescence intensity decreases due to discoloration of the resin component or temperature quenching of the phosphor. Therefore, as a result, the emission intensity is saturated and decreased, and it is difficult to increase the luminance of the light source device that combines the optical semiconductor and the phosphor layer.

  Here, the discoloration of the resin component in the phosphor layer means that the phosphor layer is usually formed into a fixed shape with good reproducibility. This is a phenomenon in which the resin component is discolored when the resin component is heated to about 200 ° C. or higher. Since the resin component is inherently transparent, if the resin component is discolored by heat, it absorbs a part of the excitation light from the optical semiconductor and the fluorescence from the phosphor layer, which prevents high brightness. It was.

  The temperature quenching of the phosphor is a phenomenon in which the fluorescence intensity decreases when the phosphor is heated. If the fluorescence intensity decreases due to temperature quenching, the energy that has not been converted to fluorescence becomes heat, so the amount of heat generated by the phosphor increases, the temperature of the phosphor rises, temperature quenching proceeds, and the fluorescence intensity further decreases. This happens. For this reason, temperature quenching of the phosphors generated by heat has also been a factor that hinders high brightness.

  In order to solve these problems, Patent Document 1 proposes a light source device using a phosphor layer that does not contain a resin. In this case, since the phosphor layer does not contain a resin component, discoloration does not occur, and furthermore, temperature quenching does not occur because the phosphor layer is a ceramic layer of a phosphor with low temperature sensitivity, so that high brightness can be achieved. is there. In addition, as shown in FIG. 1, the phosphor layer 92 is directly bonded to the optical semiconductor (solid light source) 95 to dissipate heat generated in the phosphor layer 92 to the optical semiconductor (solid light source) 95 side. It was.

JP 2006-005367 A

  Incidentally, in the conventional light source device in which the optical semiconductor (solid light source) 95 and the phosphor layer 92 are directly bonded as shown in FIG. 1, the phosphor layer excited by the excitation light from the optical semiconductor (solid light source) 95. The light emitted from the light 92 (fluorescence) is emitted to the side opposite to the optical semiconductor (solid light source) 95 side, and the light semiconductor (solid light source) 95 that is not absorbed by the phosphor layer 92 and passes through the phosphor layer 92. The excitation light from is used. That is, the light source device of FIG. 1 is of a transmissive type that uses light transmitted through the phosphor layer 92.

  Here, when light emitted from the phosphor layer 92 is considered, there is also light reflected from the interface with the phosphor layer 92 together with the transmitted light and returning to the optical semiconductor (solid light source) 95 side, that is, reflected light. This light (reflected light) is re-absorbed by the optical semiconductor (solid light source) 95, so that there is a problem that the light cannot be used as illumination light.

  1 is intended to dissipate the heat of the phosphor layer 92 to the optical semiconductor (solid light source) 95 side, but the excitation light intensity of the optical semiconductor (solid light source) 95 is increased. Since heat is generated not only in the phosphor layer 92 but also in the optical semiconductor (solid light source) 95, the heat generated in the phosphor layer 92 is dissipated from the side of the optical semiconductor (solid light source) 95 that is also generating heat. There was a problem that the efficiency of was not good.

  As described above, the light source device shown in FIG. 1 has a limitation on high luminance because it is of a transmissive type and the efficiency of heat dissipation with respect to the heat generation of the phosphor layer 92 is not good.

  An object of the present invention is to provide a light source device and an illuminating device capable of achieving a sufficiently high luminance as compared with the conventional art.

In order to achieve the above object, the invention described in claim 1 is a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflection type that can rotate around a rotation axis. The reflection-type fluorescent rotator includes at least one type of phosphor that is excited by excitation light from the solid-state light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid-state light source. Including a phosphor layer and a substrate having light reflectivity, wherein the solid light source and the phosphor layer are arranged spatially separated to utilize light emission in a reflective manner, and the substrate is the solid having a recess in a surface of the light source side, the phosphor layer is provided in the recess, wherein the phosphor layer, obtained by dispersing the phosphor powder in the glass have been used, the fluorescence of the reflective The rotating body is provided with a plurality of phosphor layers as the phosphor layer, When a circular arc is drawn with a certain radius around the rotation axis of the fluorescent rotating body, a ratio of lengths on the circular arc corresponding to a plurality of phosphor regions corresponding to the plurality of phosphor layers depends on the radius. The light source device is characterized in that the plurality of phosphor regions are arranged so as to change, and a variable means is provided for varying the distance between the solid state light source and the rotation axis of the fluorescent rotator. .

According to a second aspect of the present invention, there is provided a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflective fluorescent rotator that can rotate around a rotation axis. The reflective fluorescent rotator includes a phosphor layer including at least one kind of phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source; A substrate having light reflectivity, wherein the solid light source and the phosphor layer are spatially separated to use light emission in a reflective manner, and the substrate has a concave portion on a surface on the solid light source side The phosphor layer is provided in the recess, and the phosphor layer is made by dispersing phosphor powder in glass. At least one phosphor layer is provided as a phosphor layer, and the fluorescence circuit When drawing an arc with a certain radius around the rotation axis of the body, the at least one phosphor region corresponding to the at least one phosphor layer and the non-phosphor region not provided with the phosphor layer The at least one phosphor region and the non-phosphor region are arranged so that the ratio of the length on the arc changes depending on the radius, and the distance between the solid light source and the rotation axis of the fluorescence rotator It is a light source device characterized in that a variable means for making the variable is provided.

According to a third aspect of the present invention, there is provided a solid-state light source that emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflective fluorescent rotator that is rotatable around a rotation axis. The reflective fluorescent rotator includes a phosphor layer including at least one kind of phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source; A substrate having light reflectivity, wherein the solid light source and the phosphor layer are spatially separated to use light emission in a reflective manner, and the substrate has a concave portion on a surface on the solid light source side The phosphor layer is provided in the recess, and the phosphor layer is made by dispersing phosphor powder in glass. A plurality of phosphor layers are provided as phosphor layers, and the plurality of phosphor layers A plurality of corresponding phosphor regions are in the shape of a concentric belt centering on the rotational axis of the fluorescent rotator, and variable means for varying the distance between the solid state light source and the rotational axis of the fluorescent rotator. A light source device characterized by being provided.

According to a fourth aspect of the present invention, there is provided a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflective fluorescent rotator that is rotatable around a rotation axis. The reflective fluorescent rotator includes a phosphor layer including at least one kind of phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source; A substrate having light reflectivity, wherein the solid light source and the phosphor layer are spatially separated to use light emission in a reflective manner, and the substrate has a concave portion on a surface on the solid light source side The phosphor layer is provided in the recess, and the phosphor layer is made by dispersing phosphor powder in glass. At least one phosphor layer is provided as the phosphor layer, In addition, at least one phosphor region corresponding to one phosphor layer and a non-phosphor region in which no phosphor layer is provided are in a concentric belt-like shape around the rotation axis of the phosphor rotator. A light source device comprising: variable means for changing a distance between the solid-state light source and the rotation axis of the fluorescent rotator.

According to a fifth aspect of the present invention, in the light source device according to any one of the first to fourth aspects, the side surface of the concave portion of the substrate is an inclined surface. apparatus.

The invention described in claim 6 is an illumination device characterized by using the light source device according to any one of claims 1 to 5.

According to the first to fifth aspects of the present invention, the solid-state light source that emits light of a predetermined wavelength in the wavelength region from ultraviolet light to visible light, and the reflective fluorescence that can rotate around the rotation axis. The reflection-type fluorescent rotator includes at least one type of phosphor that is excited by excitation light from the solid-state light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid-state light source. A body layer and a substrate having light reflectivity, wherein the solid-state light source and the phosphor layer are arranged spatially separated to utilize light emission in a reflective manner, and the substrate is on the solid-state light source side The phosphor layer is provided in the recess, and the phosphor layer is made by dispersing phosphor powder in glass. And a sufficiently high brightness of the lighting device, and By using a phosphor layer in which phosphor powder is dispersed in glass, the phosphor layer can be formed at low cost (at low cost), and the cost of the light source device and lighting device can be reduced. Can do.

In particular , since the substrate has a recess on the surface of the solid light source, and the phosphor layer is provided in the recess of the substrate, it is possible to further increase the brightness. With the structure in which the layer is surrounded by the side wall of the concave portion of the substrate, it is possible to effectively prevent peeling of the phosphor layer during rotation of the phosphor rotator, and it is possible to increase reliability and improve reliability.

Further, in particular, in the invention according to claim 5, in the light source device according to any one of claims 1 to 4, the side surface of the concave portion of the substrate is inclined, and therefore inclined. The light reflected by the side surface of the recessed portion can be reliably directed to the outside of the phosphor layer (to the side opposite to the substrate), and light can be extracted from the phosphor layer more efficiently.

It is a figure which shows the conventional light source device. It is a figure which shows the example of 1 structure of the light source device of this invention. It is a figure which shows the other structural example of the light source device of this invention. It is a figure which shows the other structural example of the light source device of this invention. It is a figure (plan view) which shows various structural examples about the case where the fluorescent substance layer of a reflection type fluorescent rotating body is divided into a plurality of sections. It is a figure (plan view) which shows various structural examples about the case where the fluorescent substance layer of a reflection type fluorescent rotating body is divided into a plurality of sections. It is a figure (plan view) which shows various structural examples about the case where the fluorescent substance layer of a reflection type fluorescent rotating body is divided into a plurality of sections. It is a figure (plan view) which shows various structural examples about the case where the fluorescent substance layer of a reflection type fluorescent rotating body is divided into a plurality of sections. It is a figure (plan view) which shows various structural examples about the case where the fluorescent substance layer of a reflection type fluorescent rotating body is divided into a plurality of sections. It is a figure which shows an example of the light source device of the 1st example which can change an illumination color. It is a figure which shows an example of the fluorescence rotary body used for the light source device of FIG. It is a figure which shows an example of a moving means. It is a figure which shows the other example of the fluorescence rotary body used for the light source device of FIG. It is a figure which shows an example of the light source device of the 2nd example of the structure which changes an illumination color. It is a figure which shows an example of the fluorescence rotary body used for the light source device of FIG. It is a figure which shows an example of a moving means. It is a figure which shows the other example of the fluorescence rotary body used for the light source device of FIG.

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

  FIGS. 2A and 2B are diagrams showing a configuration example of the light source device of the present invention. 2A is a front view of the whole, and FIG. 2B is a plan view of the fluorescent rotator. Referring to FIGS. 2A and 2B, the light source device 10 includes a solid-state light source 5 that emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a driving unit (such as a motor). And a reflection type fluorescent rotator 1 that can be rotated around a rotation axis X by driving by a non-illustrated), and the reflection type fluorescent rotator 1 is excited by excitation light from a solid light source 5 and is a solid light source. 5 includes a phosphor layer 2 including at least one kind of phosphor that emits fluorescence having a longer wavelength than the emission wavelength 5 and a substrate 6 having light reflectivity. The phosphor layer 2 includes a phosphor in glass. What dispersed the powder is used.

  Here, the phosphor layer 2 is provided on the reflection-type fluorescence rotator 1 that can rotate around the rotation axis X, and is arranged spatially separated from the solid light source 5.

  The phosphor layer 2 includes at least one type of phosphor that is excited by excitation light from the solid light source 5 and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source 5. Specifically, when the solid-state light source 5 emits ultraviolet light, the phosphor layer 2 includes at least one kind of phosphor among phosphors such as blue, green, and red. When the solid light source 5 emits ultraviolet light, the phosphor layer 2 contains, for example, blue, green, and red phosphors (the blue, green, and red phosphors are, for example, uniformly When the phosphor layer 2 is irradiated with ultraviolet light from the solid light source 5, white illumination light can be obtained as reflected light. Moreover, when the solid light source 5 emits blue light as visible light, the phosphor layer 2 includes at least one kind of phosphor among phosphors such as green, red, and yellow. When the solid-state light source 5 emits blue light as visible light, when the phosphor layer 2 contains, for example, green and red phosphors (the green and red phosphors are dispersed uniformly, for example) When the phosphor layer 2 is irradiated with blue light from the solid light source 5, illumination light such as white can be obtained as reflected light. Further, when the solid light source 5 emits blue light as visible light, for example, when the phosphor layer 2 contains only a yellow phosphor, the blue light from the solid light source 5 is emitted from the phosphor layer 2. When illuminating, illumination light such as white can be obtained as reflected light.

  The substrate 6 is made of a light reflective material (for example, metal).

  In the light source device 10, the fluorescent rotator 1 is configured as a reflection type fluorescent rotator, and the surface of the phosphor layer 2 is opposite to the surface on which excitation light from the solid light source 5 is incident. A method of taking out light such as fluorescent light using reflection by a reflection surface (reflection surface of the substrate 6) provided on the substrate (hereinafter referred to as reflection method) is employed.

  As described above, the light source device 10 is basically characterized in that the solid light source 5 and the phosphor layer 2 are spatially separated and light emission is used in a reflective manner.

  That is, as in the conventional light source device shown in FIG. 1, when the phosphor layer 92 is in contact with the solid light source 95, both the phosphor layer 92 and the solid light source 95 are used even if the luminance is increased. However, in the light source device 10 shown in FIGS. 2A and 2B, the phosphor layer 2 is arranged away from the solid light source 5 because the heat dissipation efficiency from the phosphor layer 92 is poor. Thus, even when the luminance is increased, the heat from the phosphor layer 2 can be dissipated to the low-temperature substrate 6, and the efficiency of the heat dissipation from the phosphor layer 2 is shown in FIG. Compared with the conventional light source device, it can be remarkably enhanced.

  Further, in the conventional light source device shown in FIG. 1, among the excitation light from the solid light source 95 and the fluorescence from the phosphor layer 92, the fluorescence emitted to the side opposite to the solid light source 95 and the phosphor layer 92 Excitation light from a solid light source 95 that is transmitted without being absorbed is used. In other words, the transmission method is used. Here, in the transmission method, when the emitted light from the phosphor layer 92 is considered, the excitation light is reflected at the interface with the phosphor layer 92 together with the transmitted light and returns to the solid light source 95 side, that is, reflected. There is also light, and this reflected light is reabsorbed by the solid light source 95 and becomes light that cannot be used as illumination light. Further, since the fluorescence from the phosphor layer 92 is emitted from both sides of the phosphor layer 92, the light emitted to the solid light source 95 side cannot be used. Thus, in the transmission method, the light use efficiency is reduced. In addition, in the transmission method, in order to obtain illumination light with a desired chromaticity, it is necessary to increase the thickness of the phosphor layer 92, and the distance from the phosphor layer 92 to the solid light source 95 becomes long. It was disadvantageous in dissipating the heat from 92 to the solid light source 95.

  On the other hand, in the light source device 10 of FIGS. 2A and 2B, the reflection type fluorescent rotator 1 is used, and light (excitation light, fluorescence) emitted to the side opposite to the solid light source 5 is reflected on the reflection surface. Since the reflection method of reflecting to the solid light source 5 side (specifically, the reflecting surface of the substrate 6) is adopted, the light emission (fluorescence) from the phosphor layer 2 excited by the excitation light from the solid light source 5 (That is, fluorescence emitted to the solid light source 5 side) and all excitation light from the solid light source 5 that is not absorbed by the phosphor layer 2 (that is, from the solid light source 5 that is not absorbed by the phosphor layer 2). (That is, both the excitation light and the fluorescence can be efficiently used as illumination light), so that the light utilization efficiency can be remarkably increased and the luminance can be increased. . In contrast to the transmission type, in the reflection type, even if the thickness of the phosphor layer 2 is less than half, the optical path lengths in the phosphor layer 2 are equal, and light of the same chromaticity can be obtained. In addition, the distance from the phosphor layer 2 to the substrate 6 is shortened, which is advantageous in terms of heat dissipation.

  As described above, in the light source device 10 of FIGS. 2A and 2B, the solid light source 5 and the phosphor layer 2 are basically spatially separated and light emission is used in a reflective manner. Therefore, it is possible to achieve a sufficiently high brightness as compared with the conventional case.

  Further, in the light source device 10 shown in FIGS. 2A and 2B, the phosphor layer 2 is provided on the reflection-type fluorescence rotator 1 that can rotate around the rotation axis X. On the other hand, by rotating the phosphor layer 2, it is possible to disperse the places where the excitation light from the solid light source 5 hits, and to suppress the heat generation in the light irradiating portion, thereby further increasing the brightness. Become.

  Further, in the light source device 10 shown in FIGS. 2A and 2B, the phosphor layer 2 is formed by dispersing phosphor powder in glass (that is, substantially containing a resin component). Since it does not contain), there is no discoloration due to heat and there is little light absorption, so it is possible to further increase the brightness. Moreover, the phosphor layer 2 can be formed at low cost (low cost) by using a phosphor layer 2 in which phosphor powder is dispersed in glass. That is, in the structure in which the phosphor powder is dispersed in the glass, no discoloration occurs because there is no heat-sensitive resin component, and a mass production is possible because a pressurized atmosphere is not required at the time of production, and the cost (manufacturing cost) is also high. It can be kept low.

  In addition, in the light source device 10 of FIGS. 2A and 2B, a flat plate is used for the substrate 6, but a substrate other than the flat plate can be used for the substrate 6.

  FIGS. 3A and 3B are diagrams showing another configuration example of the light source device of the present invention. 3A is a front view of the whole, and FIG. 3B is a plan view of the fluorescent rotator. 3 (a) and 3 (b), the same reference numerals are given to the same portions as those in FIGS. 2 (a) and 2 (b). 3 (a) and 3 (b), in this light source device 20, the substrate 16 of the reflection type fluorescent rotator 11 that can rotate around the rotation axis X has a recess 17 on the surface of the solid light source 5 side. The phosphor layer 12 is provided in the recess 17 of the substrate 16. That is, in this configuration, the side surface (end surface) of the phosphor layer 12 is surrounded by a light-reflective side wall (side wall of the recess 17) 17a.

  Here, the phosphor layer 12 is formed by dispersing phosphor powder in glass, similarly to the phosphor layer 2 of FIGS. 2 (a) and 2 (b).

  That is, like the phosphor layer 2, the phosphor layer 12 includes at least one kind of phosphor that is excited by excitation light from the solid light source 5 and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source 5. Yes. Specifically, when the solid-state light source 5 emits ultraviolet light, the phosphor layer 12 contains at least one kind of phosphor among phosphors such as blue, green, and red. When the solid light source 5 emits ultraviolet light, when the phosphor layer 12 includes, for example, blue, green, and red phosphors (the blue, green, and red phosphors are, for example, uniform. When the phosphor layer 12 is irradiated with ultraviolet light from the solid light source 5, white illumination light can be obtained as reflected light. When the solid light source 5 emits blue light as visible light, the phosphor layer 12 includes at least one kind of phosphor among phosphors such as green, red, and yellow. When the solid light source 5 emits blue light as visible light, when the phosphor layer 12 contains, for example, green and red phosphors (each of the green and red phosphors is uniformly dispersed, for example) When the blue light from the solid light source 5 is irradiated onto the phosphor layer 12, illumination light such as white can be obtained as reflected light. Further, when the solid light source 5 emits blue light as visible light, for example, when the phosphor layer 12 includes only a yellow phosphor, the blue light from the solid light source 5 is emitted from the phosphor layer 12. When illuminating, illumination light such as white can be obtained as reflected light.

  The substrate 16 is made of a light reflective material (for example, metal).

  3A and 3B, the side surface (end surface) of the phosphor layer 12 is surrounded by a light-reflective side wall (side surface of the recess 17) 17a. The light guided to the side surface (end surface) is also reflected by the light-reflecting side wall (side surface of the recess 17) 17a and returns again into the phosphor layer 12 to efficiently (that is, reduce light loss) the phosphor. It can be removed from the layer 12. In particular, when the phosphor layer 12 is transparent or translucent, as shown in FIG. 4 (note that FIG. 4 is a diagram corresponding to FIG. 3A, and FIG. ), The light reflecting side wall (side surface of the concave portion 17) 17a is reflected by the inclined surface (light reflecting side wall (side surface of the concave portion 17) 17a). It is desirable that the surface be inclined so as to face the side opposite to 16. That is, in this case, the light reflected by the inclined light-reflecting side wall (side surface of the concave portion 17) 17a is surely directed to the outside of the phosphor layer 12 (to the side opposite to the substrate 16). Therefore, light can be extracted from the phosphor layer 12 more efficiently.

  As described above, in the configurations of FIGS. 3A, 3B, and 4, the phosphor layer 12 is provided in the concave portion 17 of the substrate 16 formed of a light-reflective material (for example, metal). By utilizing the light reflectivity of the side surface of the phosphor layer 12 (side surface 17a of the recess 17 of the substrate 16), light (excitation light, fluorescence) from the phosphor layer 12 can be reflected and used ( Since the use efficiency of light can be improved), higher brightness can be achieved.

  Further, in the configuration of FIGS. 3A, 3B, and 4, the phosphor layer 12 is surrounded by the side wall of the recess 17 of the substrate 16, so that the phosphor layer is rotated when the fluorescence rotator 11 is rotated. Even if a stress is generated in the direction perpendicular to the rotation axis X, i.e. in the in-plane direction of the phosphor layer 12, the phosphor layer 12 does not peel off, increasing the brightness and improving the reliability. be able to.

  Further, when a phosphor layer 12 in which phosphor powder is dispersed in glass is used, when this is combined with a substrate 16 having a recess 17, there is an advantage in manufacturing. That is, when the fluorescent rotating body 11 is manufactured, the molten glass in which the phosphor powder is dispersed is directly poured into the concave portion 17 of the substrate 16 and then cooled and cured, whereby the phosphor layer 12 and the substrate 16 are easily produced. It becomes possible. In this method, the phosphor layer 12 having a constant thickness can be produced by arbitrarily adjusting the depth of the concave portion 17 and injecting glass therein.

  Next, the light source device 10 in FIGS. 2A and 2B and the light source device 20 in FIGS. 3A and 3B and FIG. 4 will be described in more detail.

  In the light source device 10 of FIGS. 2A and 2B and the light source device 20 of FIGS. 3A and 3B and FIG. 4, the solid-state light source 5 emits light having a light emission wavelength from the ultraviolet light to the visible light region. Diodes and semiconductor lasers can be used.

More specifically, the solid-state light source 5 may be, for example, a light emitting diode or semiconductor laser that emits near-ultraviolet light having an emission wavelength of about 380 nm using an InGaN-based material. In this case, the phosphors of the phosphor layers 2 and 12 are excited by ultraviolet light having a wavelength of about 380 nm to about 400 nm. For example, the red phosphors include CaAlSiN ₃ : Eu ²⁺ and Ca ₂ Si _5. N ₈ : Eu ²⁺ , La ₂ O ₂ S: Eu ³⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ⁴⁺ can be used, and (Si, Al) ₆ (O, N) can be used as a green phosphor. ₈ : Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ , (Ba, Sr) ₂ SiO ₄ : Eu ^2+, etc. can be used, and (Sr, Ca, Ba, Mg) ₁₀ can be used for the blue phosphor. (PO ₄ ) _{6 Cl 2} : Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , LaAl (Si, Al) ₆ (N, O) ₁₀ : Ce ^{3+ and the} like can be used.

The solid light source 5 may be, for example, a light emitting diode or a semiconductor laser that emits blue light having a light emission wavelength of about 460 nm using a GaN-based material. In this case, the phosphors of the phosphor layers 2 and 12 are 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 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 can be used. Moreover, as what is excited by blue light with a wavelength of about 440 nm to about 470 nm, for example, 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.

  As described above, the phosphor layers 2 and 12 emit illumination light of different colors depending on whether the solid light source 5 emits, for example, ultraviolet light or blue light. Depending on whether it is desired to obtain the phosphor, only one type of these phosphors may be used, or a combination of a plurality of types (a plurality of types may be uniformly dispersed and mixed) may be used. The particle size of the phosphor is preferably in the range of 1 μm to 30 μm. This is because when the phosphor particle size is 1 μm or less, the luminous efficiency of the phosphor is lowered, and when the phosphor particle size is 30 μm or more, the dispersion state of the phosphor in the sealing base material becomes non-uniform.

Further, as the phosphor layers 2 and 12, a structure in which phosphor powder is dispersed in glass can be used. The glass preferably has a melting point of 600 ° C. or lower, which is called low melting glass. This is because the phosphor powder is dispersed in the molten glass and used, so that the phosphor having a high melting point deteriorates. As the composition of such a glass, a glass containing components such as P ₂ O ₃ , SiO ₂ , B ₂ O ₃ , and Al ₂ O ₃ as main components and an oxide of an alkali metal or an alkaline earth metal can be given. It is done. Furthermore, a heavy metal component such as Bi ₂ O ₃ or Ta ₂ O ₅ may be included. Moreover, the glass which contains nitrogen in a composition can also be used. Further, a light extraction structure may be provided on the surfaces of the phosphor layers 2 and 12 for higher brightness.

Metals, oxide ceramics, non-oxide ceramics, etc. can be used for the substrates 6 and 16, but when a glass plate in which phosphor powder is dispersed is bonded to the substrates 6 and 16, the reflectance is high. It is desirable to use a metal substrate that is high and easy to process, and it is desirable to use an oxide ceramic substrate that is stable in air even at a high temperature when molten glass is poured directly onto the substrates 6 and 16 for molding. The materials that can be used for the substrates 6 and 16 are a single substrate or an alloy such as Al, Ag, Cu, Fe, Ni, Ti, Mo, and W as a metal substrate, and Al ₂ O ₃ and ZrO _{2 in} the case of oxide ceramics. MgO, Y ₂ O _{3 and the} like. Further, a metal film may be formed on the surface of the oxide ceramic substrate. Such a structure can be realized by metallizing the oxide ceramic surface by vapor deposition, sputtering, refractory metal method or the like. In addition, the substrate 16 having the recesses 17 can be manufactured by preparing a plate material and cutting or etching the central portion, or attaching a component to be a wall to the plate material.

  Hereinafter, a method for manufacturing the phosphor layers 2 and 12 and the substrates 6 and 16 will be described.

  First, the case where the fluorescent substance layer 2 and the board | substrate 6 are affixed is demonstrated. First, as a method for producing a glass plate, a glass raw material powder which is a sealing base material is weighed so as to have a target composition ratio. Next, one or more kinds of phosphors, for example, two kinds of phosphor powders of a green phosphor and a red phosphor, are weighed and sufficiently mixed with the glass raw material. Next, this raw material is put into a crucible, heated at a temperature equal to or higher than the melting point of the glass, and melted. A glass plate can be produced by cooling the molten glass while spreading it into a plate shape. The produced glass (that is, the phosphor layer 2) is cut into a target shape and bonded to the flat substrate 6. Examples of the adhesive member at this time include metals such as organic resins, organic adhesives, inorganic adhesives, glass, and kovar.

  Next, the case where the phosphor layer 12 is formed on the substrate 16 having the recesses 17 will be described. The process up to the process of producing the molten glass is the same as the process described above. However, when the phosphor layer 12 is formed on the substrate 16 having the recesses 17, the molten glass (that is, the phosphor layer 12) is used. Pour is directly poured into the concave portion 17 of the substrate 16, and the injection is stopped when the height coincides with the height of the side wall of the concave portion 17 to cool. By doing so, the phosphor layer 12 can be formed in the concave portion 17 of the substrate 16.

  After the phosphor layers 2 and 12 and the substrates 6 and 16 are produced in this way, the substrates 6 and 16 are connected to a driving unit such as a motor to produce the reflection type fluorescent rotators 1 and 11. By combining the solid-state light source 5 and the reflection type fluorescent rotators 1 and 11, the light source devices 10 and 20 can be obtained.

  In each of the above examples, only one type of phosphor layer is used as the phosphor layers 2 and 12 of the reflection type fluorescent rotators 1 and 11. Specifically, for example, in the examples of FIGS. 2A, 2B, 3A, and 3B, the phosphor layers 2 and 12 of the reflection type fluorescent rotators 1 and 11 are made of, for example, a yellow phosphor. In this case, if a solid light source that emits blue light is used, illumination light such as white can be obtained as reflected light. Alternatively, in the examples of FIGS. 2A, 2B, 3A, and 3B, the fluorescent layers 2 and 12 of the reflection type fluorescent rotators 1 and 11 are, for example, blue, green, and red fluorescence. For example, only a phosphor layer in which each of the bodies is uniformly dispersed and mixed is used. In this case, if a solid light source that emits ultraviolet light is used, illumination such as white is reflected as reflected light. Light can be obtained. However, the present invention is not limited to this, and various modifications are possible. That is, as the phosphor layers 2 and 12 of the reflection type fluorescent rotators 1 and 11, at least one phosphor layer such as blue, green, yellow, and red can be arranged. In other words, the phosphor layers 2 and 12 of the reflective phosphor rotators 1 and 11 may be divided into a plurality of sections. When divided into a plurality of sections, it is desirable to separate adjacent sections with a light-reflective separation wall in order to prevent light emission from mixing with the adjacent sections. Moreover, the kind of phosphors dispersed in each section and the amount of dispersion may be different. Moreover, the thickness of the phosphor layer in each section may be different.

  5, 6, and 7 are diagrams (plan views) illustrating various configuration examples in the case where the phosphor layers 2 and 12 of the reflection type fluorescent rotators 1 and 11 are divided into a plurality of sections. 5, 6, and 7 are illustrated in correspondence with the configuration of FIG. 2 (a) and (b) (the phosphor layer 2 of the reflective fluorescence rotator 1) for convenience of explanation. Similarly, the configuration shown in FIGS. 3A and 3B can also be handled. In the example of FIG. 5, two types of phosphor layers 2a and 2b (12a and 12b) (for example, a red phosphor composed of a red phosphor) are used as the phosphor layer 2 (12) of the reflection type phosphor rotator 1 (11). The layer 2a (12a) and the green phosphor layer 2b (12b) made of the green phosphor are provided as a phosphor region divided into two equal parts. In this case, the solid light source 5 emits blue light. If a thing is used, illumination lights, such as white, can be obtained as reflected light at the time of rotation of the reflection type fluorescent rotating body 1 (11). In the example of FIG. 6, three types of phosphor layers 2a, 2b, 2c (12a, 12b, 12c) (for example, red phosphor) are used as the phosphor layer 2 (12) of the reflection type phosphor rotator 1 (11). The red phosphor layer 2a (12a) made of green, the green phosphor layer 2b (12b) made of green phosphor, and the blue phosphor layer 2c (12c) made of blue phosphor were divided into three equal parts. In this case, if the solid light source 5 that emits ultraviolet light is used, illumination light such as white is obtained as reflected light when the reflective fluorescent rotator 1 (11) is rotated. Can do. Further, in the example of FIG. 7, two types of phosphor layers 2a and 2b (12a and 12b) (for example, a red phosphor made of a red phosphor) are used as the phosphor layer 2 (12) of the reflection type phosphor rotator 1 (11). A phosphor layer 2a (12a) and a green phosphor layer 2b (12b) made of a green phosphor are provided as phosphor regions, and a region where no phosphor layer is provided is provided as a non-phosphor region 42c. In this case, if a solid-state light source that emits blue light is used, illumination light such as white can be obtained as reflected light when the reflective fluorescent rotator 1 (11) is rotated.

  FIGS. 8 and 9 are diagrams (plan views) showing another configuration example in the case where the phosphor layer 2 of the reflection type fluorescent rotator 1 is divided into a plurality of sections. In the configuration examples of FIGS. 5, 6, and 7 described above, a plurality of phosphor layers 2 of the reflective fluorescent rotator 1 are provided such that the boundary line between adjacent sections is in the radial direction of the reflective fluorescent rotator 1. Although divided into sections, in the configuration examples of FIGS. 8 and 9, the phosphor layer 2 of the reflective phosphor rotator 1 is concentrically divided into a plurality of sections. That is, in the configuration example of FIG. 8, three types of phosphor layers 22a, 22b, and 22c (for example, a red phosphor layer 22a made of a red phosphor, a green phosphor layer 22b made of a green phosphor, and a blue phosphor). The blue phosphor layer 22c is provided as a concentric belt-like phosphor region. In this case, the phosphor region 22a, 22b, 22c is simultaneously used by using a solid light source 5 that emits ultraviolet light. When illuminated, illumination light such as white can be obtained as reflected light, and in the configuration example of Fig. 9, two types of phosphor layers 22a and 22b (for example, a red phosphor layer 22a made of a red phosphor and a red phosphor layer 22a). The phosphor region of the green phosphor layer 22b) made of green phosphor and the non-phosphor region 52c where the phosphor layer is not provided are provided as concentric belt-like regions. In this case, the solid light source 5 Then, if the regions 22a, 22b, and 52c are simultaneously irradiated using a material that emits blue light, it is possible to obtain illumination light such as white as reflected light. Is a region having a phosphor layer, and in the case where an adjustment layer or the like for adjusting the light transmittance or reflectance corresponding to the phosphor layer is provided, the phosphor layer is included together with the phosphor layer. Here, for convenience, the phosphor layer and the phosphor region corresponding to the phosphor layer are denoted by the same reference numerals, and the concentric strips are connected over the entire circumference. A donut-shaped shape having a certain width, which is not connected over the entire circumference and does not include a shape having a certain width in a circular arc shape on the circumference. 8. In the configuration of FIG. 9, the non-phosphor region 52c has a light conversion effect. In order to obtain white light, it is necessary to make the width of the non-phosphor region 52c narrower than the widths of the phosphor regions 22a and 22b. In addition, the phosphor layers 22a, 22b, and 22c can be provided in the recesses of the substrate.

  In addition to the above examples, various modifications are possible.

  Moreover, it is also possible to combine the solid light source 5 and the reflective fluorescent rotator so as to change the illumination color. In the following, for convenience of explanation, it is assumed that the reflection type fluorescent rotator corresponds to that shown in FIGS. 2A and 2B (for convenience, FIGS. 2A and 2B are shown in each part). With the same sign). The same applies to the case where the reflection type fluorescent rotator corresponds to that shown in FIGS. 3 (a) and 3 (b). Therefore, the reflection type fluorescent rotator is shown in FIGS. 3 (a) and 3 (b). Description of the case corresponding to the thing is omitted.

  In the first example of the configuration for changing the illumination color, when a circular arc is drawn with a certain radius around the rotation axis of the reflection type fluorescent rotator as described above, there may be a plurality of regions (sometimes only a plurality of phosphor regions). Or a plurality of regions such that a ratio of lengths on the arc corresponding to at least one of the phosphor regions may vary depending on the radius. The variable means which is arrange | positioned and makes variable the distance of the solid light source 5 and the rotating shaft of a reflection type fluorescent rotating body is provided.

  More specifically, when an arc is drawn with a certain radius around the rotation axis of the reflective fluorescent rotator, the ratio of the length on the arc corresponding to the plurality of regions varies depending on the radius. As described above, in the reflective fluorescent rotator, at least one of the boundary lines dividing the plurality of regions is curved.

  FIG. 10 is a diagram illustrating an example of the light source device of the first example capable of changing the illumination color. Referring to FIG. 10, the light source device 30 includes a solid-state light source 5 that emits ultraviolet light, and a reflective fluorescent rotator 1 that can rotate around a rotation axis X (rotated by a motor 4). FIG. 11 is a diagram illustrating an example of the fluorescent rotator 1 used in the light source device 30 of FIG. In the example of FIG. 11, the reflection type fluorescent rotator 1 emits red, green, and blue fluorescence when irradiated with ultraviolet light on a substrate (for example, a metal substrate or a predetermined substrate provided with a reflection surface such as a metal film). The phosphor layers 2a, 2b, 2c that emit light respectively are arranged as three divided regions, and the boundary line 3a that separates the regions of the red and green phosphor layers 2a, 2b, the green and blue phosphors The boundary line 3b that separates the regions of the layers 2b and 2c is a straight line extending in the radial direction through the rotation axis X (rotation center) of the fluorescent rotator 1, but the red and blue phosphor layers 2a and 2c. The boundary line 3c that divides the region is curved (the boundary line that divides the phosphor region 2a that emits red fluorescence and the phosphor region 2c that emits blue fluorescence upon incidence of ultraviolet light is curved) It has become). That is, of the plurality of phosphor regions 2a, 2b, and 2c, the boundary line that divides the phosphor region 2c that emits the shortest wavelength fluorescence from the phosphor region 2a that emits the longest wavelength fluorescence is curved. Yes. Accordingly, when an arc is drawn with a certain radius around the rotation axis X of the reflective fluorescent rotator 1, the ratio of the length on the arc corresponding to the plurality of phosphor regions 2a, 2b, 2c depends on the radius. Are configured to change.

  Since the light source device 30 of FIG. 10 uses the fluorescent rotator 1 of FIG. 11, the illumination color is changed by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 by the variable means 26. Can be changed.

  As variable means 26 for changing (changing) the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1, when the solid light source 5 is fixed, the fluorescent rotator 1 is rotated by the fluorescent rotator 1. A moving means for moving in a direction orthogonal to the axis X can be used. Here, as the moving means, as shown in FIG. 12, a general means using a rack and pinion mechanism 28 that changes the rotation of the motor 27 into a linear motion can be used.

  In the configuration of FIGS. 10 to 12, when the fluorescent rotator 1 is rotated by the motor 4 to obtain white light by mixing three colors of red, green and blue, and further to change the color of the white light, the fluorescent rotator Since the boundary line 3c that divides the region of the red phosphor layer 2a and the region of the blue phosphor layer 2c is curved, the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 is By making the variable means 26 variable (by changing it), the excitation time of the green phosphor layer 2b is fixed and the excitation time of the blue phosphor layer 2c and the red phosphor layer 2a is set according to the following principle. It can be changed to control blue and red, and the illumination color can be changed to increase bluish or the illumination color can be increased to increase redness against the standard white color. It becomes possible. This means that, when a commercially available fluorescent lamp is considered, it is possible to easily obtain a light bulb color with an increased redness and a daylight color with an increased bluishness centering on white.

  That is, when the fluorescent rotator 1 is arranged so that the point A shown in FIG. 11 crosses the optical axis of the solid light source 5, when the fluorescent rotator 1 is rotated by the motor 4, the rotational axis X of the fluorescent rotator 1 is The phosphor layers 2 a, 2 b, 2 c on the arc passing through the point A as the center emit light in the respective emission colors by the solid light source 5. For example, each of the red, green, and blue phosphor layers 2a, 2b, and 2c on the arc passing through the point A has substantially the same arc length. An adjustment layer is provided over the phosphor layers 2a, 2b, and 2c, and the thicknesses of the phosphor layers 2a, 2b, and 2c are adjusted. In order to give the reference white color bluish, the excitation time of the blue phosphor layer 2c may be extended and the excitation time of the red phosphor layer 2a may be shortened, but the fluorescent rotator 1 shown in FIG. Then, what is necessary is just to excite on the circular arc centering on the rotating shaft X of the fluorescent rotating body located outside A point by the solid light source 5. In order to realize this state, for example, as shown in FIG. 12, the fluorescent rotator 1 and the motor 4 may be moved to the right in FIG. Thereby, it is possible to change the illumination color to have a bluish tint. On the other hand, in order to give the reference white color red, the fluorescent rotator 1 and the motor 4 may be moved leftward in FIG. In this case, the solid light source 5 excites the arc on the rotation axis X of the fluorescent rotator 1 located inside the point A, and the excitation time of the red phosphor layer 2a is extended to increase the blue phosphor. The excitation time of the layer 2c can be shortened, and the illumination color can be changed to a reddish color. As described above, if the fluorescent rotator 1 and the motor 4 are continuously moved by the motor 27 and the rack and pinion mechanism 28, the illumination color continuously changes from white with bluish color to white with reddish color. Can be made.

  In the example of FIG. 11, only the boundary line 3c that divides the red and blue phosphor layers 2a and 2c is curved, but in the present invention, the rotation axis X of the fluorescent rotator 1 is the center. When the circular arc is drawn with a certain radius, the fluorescent rotator 1 has the plurality of fluorescent regions 1a, 2b, 2c so that the ratio of the length on the circular arc corresponding to the plurality of fluorescent regions 2a, 2b, 2c changes depending on the radius. As long as at least one of the boundary lines 3a, 3b, and 3c that divide the phosphor regions 2a, 2b, and 2c has a curved shape, the red and blue phosphor layers 2a and 2c as in the example of FIG. When the circular arc is drawn with a certain radius around the rotation axis X of the fluorescent rotator 1, not only when the boundary line 3 c that divides the region is curved, but a plurality of phosphor regions 2 a, 2 b, 2 c The ratio of the length on the arc corresponding to 変 化 varies depending on the radius As long as this condition is satisfied, the boundary line 3a that separates the regions of the red and green phosphor layers 2a and 2b and the boundary line 3b that separates the regions of the green and blue phosphor layers 2b and 2c are also curved. It is also possible. In the example of FIG. 11, the case where the phosphor rotator is provided with three red, green, and blue phosphor regions 2a, 2b, and 2c is shown. For example, two red, green, and blue phosphor regions are provided. A case where the layers are repeatedly provided in the order of red, green and blue (when six phosphor regions are provided) is also included in the scope of the present invention.

  In the above example, the solid light source 5 that emits ultraviolet light is used, and a plurality of regions are composed of only three phosphor regions 2a, 2b, and 2c. As shown in FIG. 13, a phosphor that emits visible light (eg, blue light) and emits red and green fluorescence when irradiated with visible light (eg, blue light) as shown in FIG. The layers 2a and 2b are arranged as two divided phosphor regions, the region 42c where no phosphor layer is provided is arranged as a non-phosphor region, and the regions of the red and green phosphor layers 2a and 2b , A boundary line 3b that separates the region of the green phosphor layer 2b and the non-phosphor region 42c is a straight line that extends radially through the rotation axis X (rotation center) of the fluorescent rotator 1. The red phosphor layer 2 Border 3c for distinguishing the region and a non-fluorescent region 42c is also possible to use anything that could be curved. Also in this case, the illumination color can be changed by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 by the variable means 26. That is, by the color mixture of the color of the solid light source 5 that emits visible light (blue in the present example) and the fluorescent color (red and green) that is excited by the solid light source 5 and has a longer wavelength than the emission wavelength of the solid light source 5, When white light is obtained and the color of white light is to be changed, the boundary line 3c that separates the red phosphor region 2a and the non-phosphor region 42c of the fluorescent rotator 1 is curved. By making the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 variable by the variable means 26 (by changing it), the excitation time of the green phosphor layer 2b is set in the same principle as described above. It is possible to control the bluishness and redness by changing the illumination time of the blue solid light source 5 and the excitation time of the red phosphor layer 2a, and to increase the bluish color relative to the standard white color. Change the lighting color or increase the redness It is possible to change the lighting color.

  Further, a second example of the configuration for changing the illumination color is that the plurality of regions (sometimes only a plurality of phosphor regions, or at least one phosphor region disposed on the reflection type fluorescent rotator). In addition to a non-phosphor region) is a strip of concentric circles around the rotational axis of the reflective fluorescent rotator, the solid light source and the rotational axis of the reflective fluorescent rotator A variable means for making the distance variable is provided.

  FIG. 14 is a diagram illustrating an example of a light source device of a second example configured to change the illumination color. Referring to FIG. 14, the light source device 40 includes a solid-state light source 5 that emits ultraviolet light, and a fluorescent rotator 1 that can rotate around a rotation axis X (rotated by a motor 4). FIG. 15 is a diagram illustrating an example of the fluorescent rotator 1 used in the light source device 40 of FIG. In the example of FIG. 15, the fluorescent rotator 1 emits red, green, and blue fluorescence when irradiated with ultraviolet light on a substrate (for example, a metal substrate or a predetermined substrate provided with a reflective surface such as a metal film). The phosphor layers 22 a, 22 b, and 22 c that emit light are disposed as concentric band-shaped phosphor regions that are centered on the rotation axis X of the fluorescence rotator 1.

  Furthermore, the light source device 40 of FIG. 14 is provided with variable means 26 that makes the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 variable. At this time, it is necessary to use a fluorescent rotator 1 in which the width of the phosphor region 22c and the width of the phosphor region 22a are wider (larger) than those shown in FIG. There is.

  As variable means 26 for changing (changing) the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1, when the solid light source 5 is fixed, the fluorescent rotator 1 is rotated by the fluorescent rotator 1. A moving means for moving in a direction orthogonal to the axis X can be used. Here, as the moving means, as shown in FIG. 16, a general means using a rack and pinion mechanism 28 that changes the rotation of the motor 27 into a linear motion can be used.

  In the configuration of FIGS. 14, 15, and 16, by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 by the variable means 26, the irradiation spot of the light emitted from the solid light source 5 The area ratio of each region 22a, 22b, 22c on the entering fluorescent rotator 1 changes, and the mixing ratio of each color light emitted from each region 22a, 22b, 22c changes, so that the illumination color is changed. Can do.

  More specifically, when white light is obtained by mixing three colors of red, green, and blue, and the color of white light is to be changed, the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 is variable by the variable means 26. By changing (by changing), the area ratio of the green phosphor region 22b on the fluorescent rotator 1 that enters the irradiation spot of the light emitted from the solid light source 5 is fixed, and the blue phosphor region 22c and red color are fixed. By changing the area ratio of the phosphor region 22a, the bluish and reddish colors can be controlled, and the illumination color can be changed to increase the bluish color or the reddish color with respect to the standard white color. It is possible to change the illumination color. That is, using the fluorescent rotator 1 in which the red phosphor region 22a and the blue phosphor region 22c are arranged on both sides of the green phosphor region 22b, for example, when the bluish color is increased, an ultraviolet light irradiation spot is entered. The distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 may be changed so that the area of the blue phosphor region 22c is increased while the area of the red phosphor region 22a is decreased. Increasing the irradiation area of the blue phosphor region 22c and decreasing the irradiation area of the red phosphor region 22a is automatically realized by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1. Is done. In this way, changing the illumination color to increase the bluish color or changing the illumination color to increase the red color against the standard white color, It means that it is easy to obtain a light bulb color with increased redness and a daylight color with increased blueness.

  In the above-described example, the solid light source 5 that emits ultraviolet light is used, and a plurality of regions are configured by only three phosphor regions 22a, 22b, and 22c. As shown in FIG. 17, two fluorescent regions (phosphor layers 22a, 22) that emit red light and green light by blue excitation light are used as the fluorescent rotator 1 using a material that emits visible light (for example, blue light). 22b) and the non-phosphor region 52c can be used as a concentric belt-like region centered on the rotation axis X of the fluorescent rotator 1 while being adjacent to each other. At this time, as the fluorescent rotator 1, a non-phosphor region 52c and a phosphor region 22a having a wider (larger) width than that shown in FIG. 9 are used. There is a need.

  As described above, even when the fluorescent rotator 1 of FIG. 17 is used, by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 by the variable means 26 in the configuration of FIGS. The lighting color can be changed.

  That is, when the fluorescent rotator 1 of FIG. 17 is used, the area ratio of each region 22a, 22b, 52c on the fluorescent rotator 41 that enters the irradiation spot of the light emitted from the solid light source 5 changes. Since the mixing ratio of each color light emitted from each of the regions 22a, 22b, and 52c changes, the illumination color can be changed.

  More specifically, when white light is obtained by mixing three colors of red, green, and blue, and the color of white light is to be changed, the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 is variable by the variable means 26. By changing (by changing), the area ratio of the green phosphor region 22b on the fluorescent rotator 1 entering the irradiation spot of the blue light emitted from the solid light source 5 is fixed, and the non-phosphor region 52c and The bluish and reddish colors can be controlled by changing the area ratio of the red phosphor region 22a, and the illumination color is changed to increase the bluish color and the reddish color is increased with respect to the standard white color. Thus, the illumination color can be changed. That is, using the fluorescent rotator 1 of FIG. 17 in which the red phosphor region 22a and the non-phosphor region 52c are arranged on both sides of the green phosphor region 22b, for example, in the case where bluishness is increased, blue light irradiation is performed. The distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1 may be changed so that the area of the non-phosphor region 52c entering the spot is increased while the area of the red phosphor region 22a is decreased. . Increasing the irradiation area of the non-phosphor region 52c and decreasing the irradiation area of the red phosphor region 22a is automatically realized by changing the distance between the solid light source 5 and the rotation axis X of the fluorescent rotator 1. Is done. In this way, changing the illumination color to increase the bluish color or changing the illumination color to increase the red color against the standard white color, It means that it is easy to obtain a light bulb color with increased redness and a daylight color with increased blueness.

  Further, by combining the above-described various light source devices of the present invention with optical components such as a predetermined lens system, it is possible to provide an illumination device capable of increasing the brightness.

The present invention can be used for lighting in general.

1, 11 Fluorescent rotating body 2, 12, 22 Phosphor layer (phosphor region)
42c, 52c Non-phosphor region 4 Motor 5 Solid light source 6, 16 Substrate 17 Recessed portion of substrate 17a Side wall of recessed portion 26 Variable means 10, 20, 30, 40 Light source device

Claims (6)

A reflection-type fluorescent rotator having a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflection-type fluorescence rotator that can rotate around a rotation axis; Comprises a phosphor layer including at least one phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source, and a substrate having light reflectivity, The solid-state light source and the phosphor layer are arranged spatially apart and utilize light emission in a reflective manner, the substrate has a recess on the surface of the solid-state light source, and the phosphor layer is The phosphor layer is provided with a phosphor powder in which phosphor powder is dispersed in glass, and a plurality of phosphor layers are used as the phosphor layer in the reflective fluorescence rotating body. A circular arc with a radius around the axis of rotation of the fluorescent rotator The plurality of phosphor regions are arranged so that a ratio of lengths on the arc corresponding to the plurality of phosphor regions corresponding to the plurality of phosphor layers changes depending on the radius when drawing. A light source device comprising variable means for varying a distance between the solid-state light source and the rotation axis of the fluorescent rotator . A reflection-type fluorescent rotator having a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflection-type fluorescence rotator that can rotate around a rotation axis; Comprises a phosphor layer including at least one phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source, and a substrate having light reflectivity, The solid-state light source and the phosphor layer are arranged spatially apart and utilize light emission in a reflective manner, the substrate has a recess on the surface of the solid-state light source, and the phosphor layer is The phosphor layer is formed by dispersing phosphor powder in glass, and the reflection type fluorescent rotating body has at least one phosphor layer as the phosphor layer. Provided around the axis of rotation of the fluorescent rotator When drawing an arc with a diameter, the ratio of the length on the arc corresponding to the at least one phosphor region corresponding to the at least one phosphor layer and the non-phosphor region where the phosphor layer is not provided is The at least one phosphor region and the non-phosphor region are arranged so as to vary depending on the radius, and variable means for varying the distance between the solid state light source and the rotation axis of the phosphor rotator is provided. A light source device. A reflection-type fluorescent rotator having a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflection-type fluorescence rotator that can rotate around a rotation axis; Comprises a phosphor layer including at least one phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source, and a substrate having light reflectivity, The solid-state light source and the phosphor layer are arranged spatially apart and utilize light emission in a reflective manner, the substrate has a recess on the surface of the solid-state light source, and the phosphor layer is The phosphor layer is provided with a phosphor powder in which phosphor powder is dispersed in glass, and a plurality of phosphor layers are used as the phosphor layer in the reflective fluorescence rotating body. A plurality of phosphor regions corresponding to the plurality of phosphor layers, It is a concentric belt-shaped object centering on the rotation axis of the fluorescent rotator, and is provided with variable means for varying the distance between the solid state light source and the rotation axis of the fluorescent rotator. Light source device. A reflection-type fluorescent rotator having a solid-state light source that emits light of a predetermined wavelength in a wavelength region from ultraviolet light to visible light, and a reflection-type fluorescence rotator that can rotate around a rotation axis; Comprises a phosphor layer including at least one phosphor that is excited by excitation light from the solid light source and emits fluorescence having a longer wavelength than the emission wavelength of the solid light source, and a substrate having light reflectivity, The solid-state light source and the phosphor layer are arranged spatially apart and utilize light emission in a reflective manner, the substrate has a recess on the surface of the solid-state light source, and the phosphor layer is The phosphor layer is formed by dispersing phosphor powder in glass, and the reflection type fluorescent rotating body has at least one phosphor layer as the phosphor layer. Corresponding to the at least one phosphor layer At least one phosphor region and a non-phosphor region in which no phosphor layer is provided are concentric strips around the rotation axis of the phosphor rotator, and the solid-state light source and the phosphor A light source device characterized in that a variable means for changing a distance from a rotating shaft of a rotating body is provided. 5. The light source device according to claim 1, wherein a side surface of the concave portion of the substrate is an inclined surface. 6. An illumination device, wherein the light source device according to any one of claims 1 to 5 is used.

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