JP2011124011A - Light source device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a color break phenomenon without increasing a rotation speed of a fluorescent rotor such as to cause an increase in a motor sound, when a large light volume is obtained by irradiating a plurality of places of the fluorescent rotor using a plurality of light sources. <P>SOLUTION: The fluorescent rotor 1 is a reflection type of a conical shape and has phosphor layers 2a, 2b, 2c arranged on a substrate, which emit respectively fluorescent light of red, green, and blue when ultraviolet light is irradiated as three equally divided regions, and the three solid light sources 5a, 5b, 5c are arranged so that the ultraviolet light emitted from these may irradiate simultaneously all three phosphor layers 2a, 2b, 2c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  In recent years, lighting devices using solid-state light sources such as LEDs have been used, and one of them is a combination of a solid-state light source emitting blue light and a phosphor (irradiating phosphor with blue light from a solid-state light source). An illumination light source that realizes white light has been developed (Patent Document 1). However, it is necessary to consider cooling in a large light amount light source in which thermal degradation of the phosphor is a problem.

  On the other hand, as a light source of a projector, for example, a light source device using a disk-shaped rotating body (hereinafter referred to as a fluorescent rotating body) in which a phosphor as shown in Patent Document 2 is arranged in a predetermined region has been developed. Yes. FIG. 1 shows a fluorescent rotator 91 of this kind. Referring to FIG. 1, the fluorescent rotating body 91 includes three phosphor layers 92a, 92b, and 92c that emit red, green, or blue fluorescence when irradiated with ultraviolet light on a transparent substrate (for example, a quartz glass substrate). The areas of the three color phosphor layers 92a, 92b, and 92c are arranged by straight lines 93a, 93b, and 93c that are arranged as two divided regions and extend in the radial direction through the rotation axis (rotation center) of the fluorescence rotator 91. It is divided and arranged so as to be almost equal.

  FIG. 2 is a view showing a light source device using the fluorescent rotator 91 of FIG. Referring to FIG. 2, this light source device is excited on the optical axis of the light source 95 by rotating the fluorescent rotator 91 of FIG. 1 by a motor 94 and placing it in front of a solid light source (for example, a laser diode light source) 95. Each of the phosphor layers 92a, 92b, 92c thus emitted sequentially emits light of each color. That is, red, green, and blue light is emitted sequentially, but when the light emission period is accelerated, that is, when the rotation speed of the fluorescent rotator is increased (for example, 3600 rpm), the respective emission colors cannot be recognized and are visually recognized as white light. become able to.

  The light source device of Patent Document 2 uses a fluorescent rotator (by rotating the fluorescent rotator), and thus a light source device having an excellent cooling effect even in a large light source that causes thermal degradation of the phosphor. Can provide. Further, in this type of light source device using a fluorescent rotating body, it is conceivable to use a plurality of light sources in order to realize a light source with a large amount of light.

  When using a plurality of light sources, specifically, a method of irradiating one point of the fluorescent rotator with the optical axes of the plurality of light sources aligned, or fluorescence rotation with two light sources as disclosed in Patent Document 3 It is possible to irradiate two places on the body.

  FIG. 3 is a diagram for explaining the method disclosed in Patent Document 3. In FIG. Referring to FIG. 3, the light source device disclosed in Patent Document 3 is a fluorescent rotator in which a pair of red, green, and blue phosphor layers 102a, 102b, and 102c are repeatedly arranged as many as the number of light sources (two). 101, light sources 103a and 103b are respectively arranged on both sides with a rotation axis X (rotation center) on the diameter of the fluorescent rotator 101 interposed therebetween.

  In order to obtain a large amount of light and align the optical axes of a plurality of light sources and irradiate one point of the fluorescent rotator, it cannot be denied that the fluorescent rotator is excellent in cooling effect but has a limit. On the other hand, in the light source device of FIG. 3, the two light sources 103a and 103b irradiate different places (two places) of the fluorescent rotator 101, which is advantageous for the cooling effect.

JP 2001-148512 A JP 2004-341105 A JP 2004-317528 A

  However, in the configuration of FIG. 3, although two (plural) light sources 103a and 103b are used, the light from the two light sources 103a and 103b simultaneously irradiates only the phosphor layer emitting the same color fluorescence. Therefore, with the rotation of the fluorescent rotator, the emission color changes with time and a so-called color break phenomenon occurs.

  The color break phenomenon is a phenomenon in which individual colors of red, green and blue light emission which should be originally observed as white are visually recognized. For example, if the fluorescent rotator 101 shown in FIG. 3 is driven at a rotational speed of 1800 rpm, this sequential light emission is repeated at 60 Hz when the red, green and blue sequential light emission is set as one cycle, so long as it is normally observed in a bright room. Although the color break phenomenon does not occur, the color break phenomenon occurs when observing in a dark room or suddenly looking away from a light source or a lighting place.

  If the rotational speed of the fluorescent rotator is increased and the repetition cycle of light emission is shortened, the color break phenomenon will not occur to some extent, but it may be unpleasant for other reasons, such as an increase in motor noise due to an increase in the rotational speed. End up.

  The present invention provides a color break phenomenon without increasing the rotation speed of the fluorescent rotator so as to cause an increase in motor sound or the like when illuminating a plurality of locations on the fluorescent rotator with a plurality of light sources to obtain a large amount of light. It is an object of the present invention to provide a light source device and an illumination device that can prevent the above.

  To achieve the above object, the invention described in claim 1 includes a plurality of solid-state light sources that emit ultraviolet light, and a reflection having a plurality of phosphor regions that emit fluorescence of different colors when irradiated with ultraviolet light. And a plurality of phosphor regions in which the ultraviolet light from the plurality of solid-state light sources emits mutually different fluorescent colors at the same time. It is a light source device characterized by irradiating.

  According to a second aspect of the present invention, the ultraviolet light from the plurality of solid state light sources simultaneously irradiates a plurality of all phosphor regions emitting different fluorescent colors. It is a light source device.

  The invention according to claim 3 is a plurality of solid-state light sources that emit visible light, and at least one phosphor region that emits fluorescence having a wavelength longer than the emission wavelength of the solid-state light source when excited by the solid-state light source, A reflective fluorescent rotator having non-phosphor regions in which no phosphors are arranged as regions separated from each other, the reflective fluorescent rotator having a conical shape, and the plurality of solids In the light source device, light from a light source irradiates two or more of the phosphor region and the non-phosphor region at the same time.

  The invention according to claim 4 is characterized in that visible light from the plurality of solid-state light sources irradiates all regions of the phosphor region and the non-phosphor region simultaneously. It is a light source device.

  According to a fifth aspect of the present invention, in the reflection type fluorescent rotator, the substrate on which the phosphor is disposed has a reflection surface. It is a light source device of description.

  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, second, fifth, and sixth aspects of the invention, a plurality of solid-state light sources that emit ultraviolet light and a plurality of light sources that emit fluorescence of different colors when irradiated with ultraviolet light. A reflective fluorescent rotator having a phosphor region, the reflective fluorescent rotator having a conical shape, and ultraviolet light from the plurality of solid-state light sources simultaneously emit different fluorescent colors. Since multiple phosphor regions are irradiated, when a large amount of light is obtained by illuminating multiple locations on the fluorescent rotator with multiple light sources, the rotational speed of the fluorescent rotator is increased so as to increase motor noise. Therefore, it is possible to provide a light source device and an illumination device capable of preventing the color break phenomenon.

  Furthermore, according to the invention of claim 1, claim 2, claim 5, and claim 6, since the conical reflection type fluorescent rotator is used, for example, the apex angle of the cone is set to 90 degrees (rotation axis). The tilt angle is 45 degrees) and the angle between the optical axis of the solid state light source and the rotation axis is 90 degrees. For example, the main irradiation direction is in the rotation axis direction of the reflective fluorescent rotator. It is possible to realize a light source device and an illumination device (which makes the main irradiation direction A2 coincide with the rotation axis X direction).

  In addition, according to the invention described in claims 3 to 6, a plurality of solid light sources that emit visible light, and at least one that emits fluorescence having a wavelength longer than the emission wavelength of the solid light sources when excited by the solid light sources. A reflective fluorescent rotator having two phosphor regions and a non-phosphor region in which no phosphors are arranged as regions divided from each other, the reflective fluorescent rotator having a conical shape, In addition, since the light from the plurality of solid light sources irradiates two or more regions of the phosphor region and the non-phosphor region at the same time, the plurality of light sources irradiate a plurality of places on the fluorescent rotating body. It is possible to provide a light source device and an illuminating device capable of preventing the color break phenomenon without increasing the rotation speed of the fluorescent rotator so as to cause an increase in motor sound when obtaining a large amount of light.

  Furthermore, according to the invention of claims 3 to 6, since the conical reflection type fluorescent rotator is used, for example, the apex angle of the cone is set to 90 degrees (the inclination angle with respect to the rotation axis is 45 degrees). If the predetermined relationship is established such that the angle between the optical axis of the solid light source and the rotation axis is 90 degrees, the main irradiation direction is in the rotation axis direction of the reflective fluorescent rotating body (the main irradiation direction A2 is the rotation axis). It is possible to realize a light source device and an illuminating device (matching in the X direction).

  In the inventions according to claims 5 and 6, the reflection type fluorescent rotator provides a light source device and an illumination device with high efficiency, because the substrate on which the phosphor is arranged has a reflection surface. be able to.

It is a figure which shows the conventional fluorescence rotary body. It is a figure which shows the light source device using the fluorescence rotary body of FIG. It is a figure for demonstrating the method disclosed by patent document 3. FIG. It is a figure which shows the example of 1 structure of the light source device of the 1st Embodiment of this invention. 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 the other structural example of the light source device of the 1st Embodiment of this invention. It is a figure which shows the other structural example of the light source device of the 1st Embodiment of this invention. It is a figure which shows the example of 1 structure of the light source device of the 2nd Embodiment of this invention. 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 the other structural example of the light source device of the 2nd Embodiment of this invention. It is a figure which shows the other structural example of the light source device of the 2nd Embodiment of this invention. It is a figure which shows the other structural example of the light source device of the 2nd Embodiment of this invention. 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 the other structural example of the light source device of the 2nd Embodiment of this invention. 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 one structural example of the illuminating device using the light source device shown by the 1st, 2nd embodiment. It is a figure which shows the other structural example of the illuminating device using the light source device shown by the 1st, 2nd embodiment.

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

  The first embodiment of the present invention includes a plurality of solid-state light sources that emit ultraviolet light, and a reflection type fluorescent rotator having a plurality of phosphor regions that emit fluorescence of different colors when irradiated with ultraviolet light. And the reflective fluorescent rotator has a conical shape, and the ultraviolet light from the plurality of solid state light sources simultaneously irradiates a plurality of phosphor regions emitting different fluorescent colors. Yes.

  More preferably, the ultraviolet light from the plurality of solid-state light sources irradiates all the plurality of phosphor regions emitting different fluorescent colors at the same time.

  The phosphor region is a region having a phosphor layer. When an adjustment layer or the like is provided corresponding to the phosphor layer as will be described later, the phosphor region is provided together with the phosphor layer. It shall refer to what is included. In the following, for the sake of convenience, the same reference numerals are assigned to the phosphor layers and the corresponding phosphor regions.

  FIG. 4 is a diagram (schematic front view) showing a configuration example of the light source device according to the first embodiment of the present invention. Referring to FIG. 4, the light source device 10 includes three solid light sources 5 a, 5 b, 5 c that emit ultraviolet light, and a cone-shaped fluorescent rotator that is rotatable around a rotation axis X (rotated by a motor 4). 1 is provided. 5 is a diagram (plan view) showing an example of the fluorescent rotator 1 used in the light source device 10 of FIG. 4 (note that the positions of the solid light sources 5a, 5b, and 5c are also shown in FIG. ). In the example of FIG. 5, the fluorescent rotator 1 has three divided regions (3 etc.) of phosphor layers 2a, 2b, and 2c that emit red, green, and blue fluorescence when irradiated with ultraviolet light on the substrate. Divided area). As shown in FIG. 5, in the light source device 10 of FIG. 4, the three solid light sources 5a, 5b, 5c are emitted from the three solid light sources 5a, 5b, 5c in the direction of the arrow A1. Light is arranged to irradiate all three phosphor layers 2a, 2b, 2c simultaneously.

  Further, in the light source device 10 of FIG. 4, the conical fluorescent rotator 1 is configured as a reflection type, and is excited by ultraviolet light (excitation light) emitted from the solid light sources 5a, 5b, and 5c in the direction of the arrow A1. Of the emitted light from each of the phosphor layers 2a, 2b, 2c, the light reflected by the cone-shaped fluorescent rotating body 1 and emitted in the direction of arrow A2 can be used as illumination light. Hereinafter, this type of fluorescent rotator is referred to as a reflective fluorescent rotator. Here, when the emitted light from the phosphor layers 2a, 2b, and 2c is considered, the light that is reflected by the phosphor layers 2a, 2b, and 2c and transmitted through the fluorescence rotator 1 is reflected along with the light reflected with respect to the incident excitation light. There is also light that does not excite the phosphor layers 2a, 2b, and 2c and that passes through the fluorescent rotator 1 as excitation light. If the substrate on which the phosphor layers 2a, 2b, and 2c of the fluorescent rotator 1 are arranged is transparent, these lights become transmitted light that passes through the back side of the fluorescent rotator 1 and cannot be used as illumination light. End up.

  When the reflection type fluorescent rotator 1 is used, the substrate itself on which the phosphor layers 2a, 2b, 2c of the fluorescent rotator 1 are arranged is used as the illumination light from the phosphor layers 2a, 2b, 2c. Can be made of metal. Alternatively, a reflecting surface can be provided on the substrate on which the phosphor layers 2a, 2b, 2c of the fluorescent rotator 1 are arranged. Specifically, a metal film can be disposed on a transparent substrate. Thereby, a highly efficient light source device is realizable.

  The conversion efficiency from excitation light to fluorescence in the phosphor layer in the phosphor region is about 50% to 99%, although it varies depending on the phosphor material forming the phosphor layer. Therefore, in the present invention, it is necessary to design the fluorescent rotator 1 taking this conversion efficiency into consideration. Specifically, a design method for adjusting the transmittance or reflectance of the phosphor region in which the phosphor layer having high conversion efficiency is arranged can be considered. As a method of adjusting the transmittance or reflectance of the phosphor regions 2a, 2b, and 2c, a method of further providing an adjustment layer having a predetermined transmittance on the phosphor layers 2a, 2b, and 2c can be considered. Here, as the adjustment layer, a method of arranging a pigment having an absorption wavelength in the vicinity of the fluorescence wavelength of each phosphor as a thin film can be used.

  In the configuration of FIGS. 4 and 5, three solid light sources 5 a, 5 b, and 5 c that emit ultraviolet light when rotating the fluorescent rotator 1 by the motor 4 to obtain white light by mixing three colors of red, green, and blue. However, at the same time, the phosphor layers 2a, 2b, and 2c are arranged so as to irradiate different phosphor layers. The color break phenomenon can be prevented without increasing the rotational speed of the fluorescent rotator so as to cause an increase or the like.

  For example, when irradiating a fluorescent rotating body having three red, green, and blue phosphor regions shown in FIG. 5 with three solid light sources, if attention is paid to only one light source, red, green, and blue light emission is repeated in time sequence. If a different light source is used to excite different colors at the same time, a mixed color of different luminescent colors excited by multiple light sources will be observed, and a color break is unlikely to occur. . In particular, as in the light source position shown in FIG. 5, when the fluorescent rotator divided into three equal parts is excited with the same number of light sources divided into three equal parts, the red, green and blue three fluorescent colors are always generated at a certain moment. Since the light is emitted and this relationship is always maintained, a light source device that does not feel a color break at all can be realized.

  Further, in the configurations of FIGS. 4 and 5, the cone-shaped reflection type fluorescent rotator is used. For example, the apex angle of the cone is 90 degrees (the inclination angle with respect to the rotation axis X is 45 degrees). If a predetermined relationship is established such that the angle between the optical axis and the rotation axis X is 90 degrees, the main irradiation direction is in the rotation axis X direction of the reflective fluorescent rotator (the main irradiation direction A2 is the rotation axis X direction). The light source device can be realized. This makes it possible to unify the emission directions of a plurality (three in this case) of light (white light) without providing an extra optical system.

  Hereinafter, the light source device 10 according to the first embodiment of the present invention will be described in more detail.

  In the light source device 10 according to the first embodiment of the present invention, the solid light sources 5a, 5b, and 5c may all have the same configuration. That is, for the solid light sources 5a, 5b, and 5c, for example, light emitting diodes that emit near ultraviolet light having an emission wavelength of about 380 nm using an InGaN-based material can be used. The solid light sources 5a, 5b, and 5c are not limited to light emitting diodes, and any light source that emits ultraviolet light may be used, and a semiconductor laser or the like may be used.

  In addition, the phosphor rotator 1 includes phosphor layers 2a, 2b, and 2c corresponding to red, green, and blue emission colors so that each color has the same shape (area) as shown in FIG. Can be used (so that is divided into three equal parts). When the conversion efficiency differs among the phosphors of the respective colors, the fluorescent rotator is produced according to the design method described above. As for painting, the electrodeposition method can be used while maintaining the conical shape, or it can be assembled after printing using a screen having openings (metal mesh openings) corresponding to the respective phosphor layer patterns on a flat plate on which the cone is developed. A conical shape can be used. A metal substrate such as aluminum can be used as the substrate of the reflection type fluorescent rotator, which is advantageous when assembling after electrodeposition or printing. It is possible to use a transparent body such as a quartz glass substrate for the substrate. In that case, however, it is necessary to form a metal film such as aluminum as a reflective surface by a method such as vapor deposition. When a metal substrate such as aluminum is used, a reflecting surface is not necessary.

  Here, each light source has the same shape (area) (each color is divided into three equal parts), and the rotation axis of the solid-state light sources 5a, 5b, 5c is also the conical reflection type fluorescent rotator 1. They are arranged at the same pitch (equal intervals) on a predetermined arc centered on X. By adopting such an arrangement, it is possible to create a state in which all the colors of the conical reflection type fluorescent rotator 1 always emit light simultaneously.

The phosphor layers 2a, 2b, and 2c are excited by ultraviolet light having a wavelength of about 380 nm to about 400 nm. For example, the red phosphor layer 2a has CaAlSiN ₃ : Eu ²⁺ , Ca ₂ Si _5. N8: Eu ²⁺ , La ₂ O ₂ S: Eu ³⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ⁴⁺ can be used, and the green phosphor layer 2b has (Si, Al) ₆ (O, N ): Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ , (Ba, Sr) ₂ SiO ₄ : Eu ^2+, etc. can be used, and the blue phosphor layer 2 c has (Sr, Ca, Ba, Mg). _{) 10 (PO 4) 6 C} l2: Eu 2+, BaMgAl 10 O 17: Eu 2+, LaAl (Si, Al) 6 (N, O) 10: Ce 3+ and the like be used That.

  In the above-described example, the three solid light sources 5a, 5b, and 5c simultaneously irradiate the three phosphor layers (that is, all the phosphor layers) 2a, 2b, and 2c. Although the color break phenomenon can be prevented more completely, the present invention is not limited to this configuration, and various modifications are possible. For example, as shown in FIG. 6, the number of solid light sources is two for the three phosphor layers 2a, 2b, 2c on the fluorescent rotator 1, and the two solid light sources 5a, 5b The case where two phosphor layers of the body layers 2a, 2b and 2c are irradiated is also included in the scope of the present invention. In this case, although it is inferior to the case shown in FIG. 5, the color break phenomenon can be prevented. Further, in the above-described example, the case where the phosphor rotator is provided with the three phosphor regions 2a, 2b, and 2c of red, green, and blue is illustrated. For example, as illustrated in FIG. In the case where two regions are repeatedly provided in the order of red, green, and blue (in the case where six phosphor regions are provided), the solid light sources 5a, 5b, and 5c are illustrated in FIGS. 7A and 7B. Such arrangements are also included in the scope of the present invention.

  The light source device according to the second embodiment of the present invention includes a plurality of solid-state light sources that emit visible light, and at least one phosphor that is excited by the solid-state light source and emits fluorescence having a wavelength longer than the emission wavelength of the solid-state light source. A reflective fluorescent rotator having a region and a non-phosphor region in which no phosphor is arranged as a region divided from each other, the reflective fluorescent rotator having a conical shape, and The light from a plurality of solid light sources irradiates two or more of the phosphor region and the non-phosphor region simultaneously.

  More preferably, the visible light from the plurality of solid-state light sources irradiates all the regions of the phosphor region and the non-phosphor region at the same time.

  The phosphor region is a region having a phosphor layer. When an adjustment layer or the like is provided corresponding to the phosphor layer as will be described later, the phosphor region is provided together with the phosphor layer. It shall refer to what is included. In the following, for the sake of convenience, the same reference numerals are assigned to the phosphor layers and the corresponding phosphor regions. The non-phosphor region refers to a region that does not have a phosphor layer.

  FIG. 8 is a diagram (schematic front view) showing a configuration example of the light source device according to the second embodiment of the present invention. In FIG. 8, the same parts as those in FIG. Referring to FIG. 8, the light source device 40 is rotatable around a rotation axis X (rotated by a motor 4) and three solid light sources 45a, 45b, 45c that emit visible light (for example, blue light). A cone-shaped fluorescent rotating body 41. FIG. 9 is a diagram (plan view) showing an example of the fluorescent rotator 41 used in the light source device 40 of FIG. 8 (note that FIG. 9 also shows the positions of the solid light sources 45a, 45b, and 45c). ). In the example of FIG. 8, the fluorescent rotator 41 is a phosphor in which phosphor layers 42 a and 42 b that emit red and green fluorescence when irradiated with visible light (for example, blue light) are divided into two. A region 42c that is disposed as a region and is not provided with a phosphor layer is disposed as a non-phosphor region. Here, the regions 42a, 42b, and 42c are configured as regions divided into three equal parts. As shown in FIG. 9, in the light source device 40 of FIG. 8, the three solid light sources 45a, 45b, 45c are visible from the three solid light sources 45a, 45b, 45c emitted in the direction of the arrow A1. Light (for example, blue light) is arranged to irradiate all three regions 42a, 42b, 42c at the same time.

  In the light source device 40 of FIG. 8, the conical fluorescent rotator 41 is configured as a reflection type, and is excited by visible light (for example, blue light) emitted from the solid light sources 45a, 45b, and 45c in the direction of the arrow A1. Of the light emitted from each phosphor region (each phosphor layer) 42a, 42b, the light (red light, green light) reflected by the cone-shaped fluorescence rotator 41 and emitted in the direction of arrow A2 and non-light Light (blue light) reflected in the direction of arrow A2 by the phosphor region 42c can be used as illumination light. Hereinafter, this type of fluorescent rotator is referred to as a reflective fluorescent rotator. Here, when the emitted light from the phosphor layers 42a and 42b is considered, the light that is reflected by the phosphor layers 42a and 42b together with the light reflected with respect to the incident excitation light and transmitted through the fluorescence rotator 41, or the phosphor layer There is also light that does not excite 42a and 42b and passes through the fluorescent rotator 41 as excitation light. If the substrate on which the phosphor layers 42a and 42b of the fluorescent rotator 41 are disposed is transparent, these lights become transmitted light that passes through the back side of the fluorescent rotator 41 and cannot be used as illumination light. .

  When the reflection type fluorescent rotator 41 is used, the transmitted light from the phosphor layers 42a and 42b is used as illumination light, so that the substrate itself on which the phosphor layers 42a and 42b of the fluorescent rotator 41 are arranged is made of metal. can do. Alternatively, a reflective surface can be provided on the substrate on which the phosphor layers 42a and 42b of the fluorescence rotator 41 are arranged. Specifically, a metal film can be disposed on a transparent substrate. Thereby, a highly efficient light source device is realizable.

  The conversion efficiency from excitation light to fluorescence in the phosphor layer in the phosphor region is about 50% to 99%, although it varies depending on the phosphor material forming the phosphor layer. Therefore, in the present invention, it is necessary to design the fluorescent rotator 41 taking this conversion efficiency into consideration. Specifically, the transmittance or reflectance of the non-phosphor region 42c (conversion efficiency is 100%), the phosphor region where the phosphor layer having high conversion efficiency is arranged, or the non-phosphor region 42c is adjusted. A design method for adjusting the transmittance or the reflectance by imparting a scattering property to the surface can be considered. As a method for adjusting the transmittance or reflectance, an adjustment layer having a predetermined transmittance is provided on the non-phosphor region 42c in the non-phosphor region 42c, and a phosphor layer is provided in the phosphor regions 42a and 42b. A method of further providing an adjustment layer having a predetermined transmittance on the layers 42a and 42b is conceivable. Here, as the adjustment layer provided on the non-phosphor region 42c, a method of arranging a pigment that partially absorbs blue light as a thin film can be used. Further, as the adjustment layer provided to overlap the phosphor layers 42a and 42b, a method of arranging a pigment having an absorption wavelength near the fluorescence wavelength of each phosphor as a thin film can be used. Further, in order to make the non-phosphor region 42c have a scattering property, the substrate surface of the fluorescent rotator 41 is provided with fine irregularities, or a scattering layer mixed with a scattering material is disposed on the substrate of the fluorescent rotator 41. Possible methods.

  8 and 9, the solid light sources 45a, 45b, and 45c that emit visible light (for example, blue light) (in this example, blue) and the solid light sources that are excited by the solid light sources 45a, 45b, and 45c. When obtaining white light by mixing with fluorescent colors (red and green) having a wavelength longer than the emission wavelengths of 45a, 45b, and 45c, three solid light sources 45a, 45b, and 45c that emit blue light are simultaneously Since it arrange | positions so that different area | regions 42a, 42b, and 42c may be irradiated, when it irradiates the several places of a fluorescent rotating body with a several light source and obtains a large light quantity, it is fluorescent so that the increase in a motor sound etc. will be produced. The color break phenomenon can be prevented without increasing the rotational speed of the rotating body.

  Further, in the configurations of FIGS. 8 and 9, since the conical reflection type fluorescent rotator is used, for example, the apex angle of the cone is set to 90 degrees (the inclination angle with respect to the rotation axis X is 45 degrees), and the solid light source If a predetermined relationship is established such that the angle between the optical axis and the rotation axis X is 90 degrees, the main irradiation direction is in the rotation axis X direction of the reflective fluorescent rotator (the main irradiation direction A2 is the rotation axis X direction). The light source device can be realized. This makes it possible to unify the emission directions of a plurality (three in this case) of light (white light) without providing an extra optical system.

  Hereinafter, the light source device 40 of the second embodiment of the present invention will be described in more detail.

  In the light source device 40 according to the second embodiment of the present invention, the solid light sources 45a, 45b, and 45c can all have the same configuration. That is, for the solid light sources 45a, 45b, and 45c, for example, light emitting diodes that emit blue light having a light emission wavelength of about 460 nm using a GaN-based material can be used. The solid light sources 45a, 45b, and 45c are not limited to light emitting diodes, and any light source that emits blue light may be used, and a semiconductor laser or the like may be used.

  In addition, as shown in FIG. 9, the fluorescent rotator 41 includes two phosphor regions (phosphor layers 42a and 42b) that emit red and green light by blue excitation light and non-phosphor regions 42c. Those arranged so that the regions 42a, 42b, and 42c have the same shape (area) (so that the regions 42a, 42b, and 42c are equally divided into three) can be used. If the conversion efficiency differs among the phosphors of the respective colors, the phosphor region is designed according to the design method described above. In the non-phosphor region, the aforementioned adjustment layer is provided with a pigment that partially absorbs blue light and adjusts the transmittance of blue light. The adjustment layer and the phosphor region arranged in the non-phosphor region can be separately applied by using an electrodeposition method while maintaining a conical shape, or openings corresponding to the respective phosphor layer patterns on a flat plate in which the cone is developed ( It is possible to use a method of assembling and forming a conical shape after printing using a screen having a metal mesh opening). A metal substrate such as aluminum can be used as the substrate of the reflection type fluorescent rotator, which is advantageous when assembling after electrodeposition or printing. Note that a transparent body such as a quartz glass substrate can be used as the substrate, but in that case, a metal film such as aluminum needs to be formed as a reflecting surface by a method such as vapor deposition. When a metal substrate such as aluminum is used for the substrate, the reflecting surface is not necessary.

  Here, the regions 42a, 42b, and 42c have the same shape (area) (the regions 42a, 42b, and 42c are equally divided into three), and the solid-state light sources 45a, 45b, and 45c with respect to the fluorescent rotator 41. Are also arranged at the same pitch (equal intervals) on a predetermined arc centered on the rotation axis X of the conical reflection type fluorescent rotator 41. By adopting such an arrangement, it is possible to create a state in which all the regions 42a, 42b, and 42c of the conical reflection type fluorescent rotating body 41 are always emitting light at the same time.

  In the above-described example of the second embodiment of the present invention, the three solid light sources 45a, 45b, and 45c simultaneously irradiate the three regions (that is, all regions) 42a, 42b, and 42c. Thus, the color break phenomenon can be prevented more completely, but the present invention is not limited to this configuration, and various modifications are possible. For example, as shown in FIG. 10, the number of solid light sources is 2 for the three regions 42a, 42b, and 42c on the fluorescent rotator, and the two solid light sources 45a and 45b are simultaneously three regions 42a and 42b. , 42c is also included in the scope of the present invention. In this case, the color break phenomenon can be prevented although it is inferior to the case shown in FIG. In the above example, the case where the fluorescent rotator is provided with the three regions 42a, 42b, and 42c is shown. However, the three regions 42a, 42b, and 42c are repeatedly provided in order of two. If the solid light sources 45a, 45b, and 45c are arranged as shown in FIGS. 11 (a) and 11 (b) when there are six phosphor regions (in the case where six phosphor regions are provided), the scope of the present invention is also included. included.

  In the above example, the fluorescent rotator shown in FIGS. 9 and 11 is used. However, as the conical reflection type fluorescent rotator in the second embodiment, for example, one fluorescent region and one fluorescent region are used. It is also possible to employ a configuration in which two solid light sources that emit visible light (for example, blue light) are used as a solid light source, using a reflection type fluorescent rotator formed in two regions of two non-phosphor regions. FIG. 12 is a diagram illustrating a configuration example of such a light source device. Referring to FIG. 12, the light source device 88 includes two solid-state light sources 45a and 45b that emit visible light (for example, blue light), and fluorescence rotation that can rotate around the rotation axis X (rotated by the motor 4). And a body 72. 13 is a diagram (plan view) showing an example of a conical reflection type fluorescent rotator 72 used in the light source device 88 of FIG. 12 (note that FIG. 13 also shows the positions of the solid light sources 45a and 45b. Have been). In the example of FIG. 13, the fluorescent rotator 72 has a phosphor layer 74 that emits yellow fluorescence when irradiated with visible light (for example, blue light) on a substrate as a single phosphor region. A region 75 where no layer is provided is arranged as one non-phosphor region (that is, a yellow phosphor region 74 having a phosphor layer that emits yellow light by blue excitation light and a non-phosphor region 75 include Is placed). Here, each area | region 74 and 75 is comprised as an area | region (area | region equally divided into 2) of the same shape (area). As shown in FIG. 13, in the light source device 88 of FIG. 12, the two solid light sources 45 a and 45 b have the visible light (for example, blue light) from the two solid light sources 45 a and 45 b at the same time. It arrange | positions so that the two area | regions 74 and 75 may be irradiated. That is, with respect to the fluorescent rotator 72 having the same shape in each of the regions 74 and 75, the solid light sources 45a and 45b are also on a predetermined arc around the rotation axis X of the conical reflective fluorescent rotator 72. Are arranged at the same pitch (equal intervals). By adopting such an arrangement, it is possible to create a state in which all the regions 74 and 75 of the fluorescent rotator 72 always emit light simultaneously. In such a configuration, it is necessary to set the conversion efficiencies in the regions 74 and 75 to be the same. For this reason, for example, in the non-phosphor region 75, the adjustment layer described above emits blue light. Part of the pigment is absorbed.

  12 and 13, the color of the solid light sources 45a and 45b that emit visible light (for example, blue light) (blue in the present example) and the solid light sources 45a and 45b excited by the solid light sources 45a and 45b. When obtaining white light by mixing with a fluorescent color (yellow) having a wavelength longer than the emission wavelength, the two solid light sources 45a and 45b emitting blue light simultaneously irradiate different regions 74 and 75, respectively. Because it is arranged, when illuminating multiple places of the fluorescent rotator with multiple light sources to obtain a large amount of light, the color of the fluorescent rotator does not increase so fast that the motor sound increases. Break phenomenon can be prevented.

  More specifically, in the light source device 88 of FIGS. 12 and 13, for the solid light sources 45a and 45b, for example, a light emitting diode that emits blue light having an emission wavelength of about 460 nm using a GaN-based material can be used. . The solid light sources 45a and 45b are not limited to light emitting diodes, and any light source that emits blue light may be used, and a semiconductor laser or the like may be used.

The yellow phosphor layer 74 is excited by blue light having 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 A yellow phosphor such as: Eu ²⁺ , Ca _x (Si, Al) ₁₂ (O, N) ₁₆ : Eu ²⁺ can be used.

  In addition, in the conical reflection type fluorescent rotator 72, the adjustment layer and the phosphor region arranged in the non-phosphor region are formed by using the electrodeposition method while maintaining the conical shape, or a flat plate in which the cone is developed. In addition, a method of using a screen having openings (metal mesh openings) corresponding to the respective phosphor layer patterns and then assembling them into a conical shape can be used. As the substrate of the reflection type fluorescent rotator, a metal substrate such as aluminum can be used, which is advantageous at the time of assembly after electrodeposition or printing. It is possible to use a transparent material such as a quartz glass substrate as the substrate of the reflection type fluorescent rotator. In this case, a metal film such as aluminum is formed as a reflective surface of the substrate by a method such as vapor deposition. There is a need. When a metal substrate such as aluminum is used for the substrate of the reflection type fluorescent rotator, the reflection surface is unnecessary.

  In each example of the first and second embodiments of the present invention described above, the number of light sources for one area is set to 1, but a plurality of light sources can be used for one area. FIGS. 14 and 15 are diagrams showing a case where two light sources are used in each region in the configuration examples of FIGS. 12 and 13. That is, in the example of FIGS. 14 and 15, two light sources 45a, 46a, 45b, and 46b are used for one phosphor region 74 and non-phosphor region 75, respectively. Thus, it is possible to provide a plurality of light sources in each region. That is, the number of divided areas and the number of light sources may not be equal.

  FIG. 16 is a diagram showing a configuration example of an illumination device using the light source device (10, 40, etc.) shown in the first and second embodiments. The illuminating device of FIG. 16 has a case 82 that forms an outer shape of the illuminating device, a light source device (10, 40, etc.) stored in the case 82, and a predetermined amount of light from the light source device (10, 40, etc.) forward. The lens system 83 irradiates with light characteristics.

  FIG. 17 is a diagram showing another configuration example of an illumination device using the light source device (10, 40, etc.) shown in the first and second embodiments. The illuminating device of FIG. 17 has a case 84 that forms an outer shell of the illuminating device, a light source device (10, 40, etc.) stored in the case 84, and light from the light source device (10, 40, etc.) arranged in a predetermined direction. The zoom lens system 85 irradiates with optical characteristics. In the illumination device of FIG. 17, the light distribution can be varied by using the zoom lens system 85. In particular, when an electric zoom lens system is used, the light distribution can be varied by remote control.

  Even when a lens system is used as shown in FIGS. 16 and 17, if the light source device of the present invention is used, an illuminating device that does not cause a color break with a large amount of light can be realized.

  Furthermore, in the reflection type fluorescent rotator of the present invention, a highly efficient light source device and illumination device can be provided by forming a reflective surface on a substrate on which the phosphor layer of the fluorescent rotator is disposed. .

The present invention can be used for lighting in general.

1, 41, 72 Fluorescent rotating body 2a, 2b, 2c, 42a, 42b, 74 Phosphor region (phosphor layer)
42c, 75 Non-phosphor region 4 Motor 5a, 5b, 5c, 45a, 45b, 45c Solid light source 10, 40, 88 Light source device 82, 84 Case 83 Lens system 85 Zoom lens system

Claims (6)

A plurality of solid state light sources that emit ultraviolet light; and a reflection type fluorescent rotator having a plurality of phosphor regions that emit fluorescence of different colors when irradiated with ultraviolet light. A light source device having a shape and irradiating a plurality of phosphor regions emitting different fluorescent colors simultaneously with ultraviolet light from the plurality of solid state light sources. 2. The light source device according to claim 1, wherein the ultraviolet light from the plurality of solid light sources irradiates all of the plurality of phosphor regions emitting different fluorescent colors at the same time. A plurality of solid-state light sources that emit visible light, at least one phosphor region that is excited by the solid-state light source and emits fluorescence having a wavelength longer than the emission wavelength of the solid-state light source, and a non-phosphor in which no phosphor is disposed And a reflection type fluorescent rotator having a region as a region divided from each other, the reflection type fluorescent rotator having a conical shape, and light from the plurality of solid-state light sources is the phosphor region and A light source device that irradiates two or more of the non-phosphor regions simultaneously. The light source device according to claim 3, wherein visible light from the plurality of solid state light sources irradiates all of the phosphor region and the non-phosphor region simultaneously. 5. The light source device according to claim 1, wherein the reflective fluorescent rotator has a reflective surface on a substrate on which the fluorescent material is arranged. 6. An illumination device, wherein the light source device according to any one of claims 1 to 5 is used.

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