JP5523876B2 - Light source device and lighting device - Google Patents

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, two places of the fluorescent rotator 101 are irradiated by the two light sources 103a and 103b, 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.

  In order to avoid such a problem, the inventor of the present application irradiates a plurality of places of a fluorescent rotating body with a plurality of light sources in Japanese Patent Application No. 2009-278187 (hereinafter referred to as a prior application) which is a prior application of the present application. Thus, the present invention has devised 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 increase the motor sound when obtaining a large amount of light.

  That is, in the prior application of the present application, for example, as shown in FIG. 4 (in FIG. 4, the same reference numerals are given to the same parts as in FIGS. 1 and 2), a plurality of solid light sources 95 a, 95 b, In order to obtain a large amount of light by irradiating a plurality of locations of the fluorescent rotator 91 with 95c, a plurality of phosphors that emit light of different colors simultaneously from the light from the plurality of solid light sources 95a, 95b, 95c When a plurality of solid light sources 95a, 95b, and 95c are arranged so as to irradiate the regions 92a, 92b, and 92c. The color break phenomenon can be prevented without increasing the rotation speed of the fluorescent rotator so as to increase the sound.

  However, in this case, the distance between the optical axis of the plurality of solid light sources 95a, 95b, and 95c and the fluorescence rotator 91 from the rotation axis X of the fluorescence rotator 91 is the same for the plurality of solid light sources 95a, 95b, and 95c. (Schematically, for example, as shown in FIG. 4, when the plurality of solid light sources 95a, 95b, and 95c are arranged at the same distance from the rotation axis X of the fluorescent rotator 91), the plurality of solid light sources 95a , 95b, and 95c continue to irradiate a portion on one concentric circle of the fluorescent rotator 91 (a portion on the concentric circle of the same radius of the fluorescent rotator 91), and the deterioration of the phosphor in that portion is prevented. I will invite you.

  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 illuminating device that can prevent the deterioration of the phosphor of the fluorescent rotating body.

In order to achieve the above object, the invention described in claim 1 is characterized in that a plurality of solid-state light sources that emit ultraviolet light and a rotation light that can be rotated around an axis of rotation, and emit fluorescence of different colors when irradiated with ultraviolet light. A fluorescent rotator having a plurality of phosphor regions that emit light, and ultraviolet light from the plurality of solid-state light sources simultaneously irradiates all of the plurality of phosphor regions that emit fluorescence of different colors. The plurality of solid light sources are arranged, and the distance from the rotation axis of the fluorescent rotator at the intersection of the optical axes of the plurality of solid light sources and the fluorescent rotator is different for each of the plurality of solid light sources. The light source device is characterized.

The invention according to claim 2 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 non-phosphor region in which no phosphor is disposed, and a fluorescent rotator that is rotatable around a rotation axis. The light from the plurality of solid-state light sources is The plurality of solid light sources are arranged so as to simultaneously irradiate all regions of the body region and the non-phosphor region, and the rotation of the fluorescent rotator at the intersection of the optical axis of the plurality of solid light sources and the fluorescent rotator A distance from an axis is different for each of the plurality of solid state light sources.

According to a third aspect of the present invention, when the fluorescent rotator is a transmission type fluorescent rotator, the phosphor region of the fluorescent rotator includes a phosphor layer and a transparent layer on which the phosphor layer is disposed. A transparent substrate, and an optical means disposed on the solid light source side of the transparent substrate and transmitting light emitted from the solid light source and reflecting light emitted from the phosphor layer. The light source device according to claim 1 , wherein the light source device is a light source device.

According to a fourth aspect of the present invention, when the fluorescent rotator is a reflection type fluorescent rotator, the substrate on which the phosphor layer of the fluorescent rotator is disposed is provided with a reflective surface. It is a light source device as described in any one of Claims 1 thru | or 3 characterized by these.

The invention according to claim 5 is an illumination device characterized by using the light source device according to any one of claims 1 to 4 .

According to the inventions of claim 1 and claims 3 to 5 , a plurality of solid-state light sources that emit ultraviolet light and the rotation of the solid light source around the rotation axis, and different colors when irradiated with ultraviolet light. A fluorescent rotator having a plurality of phosphor regions that emit fluorescence, and the ultraviolet light from the plurality of solid-state light sources simultaneously irradiates all of the plurality of phosphor regions that emit fluorescence of different colors. The plurality of solid light sources are arranged as described above, and the distance from the rotation axis of the fluorescent rotator to the intersection of the optical axes of the plurality of solid light sources and the fluorescent rotator is different for each of the plurality of solid light sources. So, when illuminating multiple places on the fluorescent rotator with multiple light sources to obtain a large amount of light, the color break phenomenon is prevented without increasing the rotational speed of the fluorescent rotator so as to cause an increase in motor sound. It is possible to Further in this case, it is possible to provide a light source device and a lighting device capable of reducing the deterioration of the phosphor of the fluorescent rotor.

Further, according to the inventions of claims 2 to 5 , 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 plurality of phosphor regions and a non-phosphor region in which no phosphors are arranged as regions divided from each other, and a fluorescent rotator that is rotatable around a rotation axis, The plurality of solid light sources are arranged so that all the light of the phosphor region and the non-phosphor region are simultaneously irradiated, and the intersection of the optical axis of the plurality of solid light sources and the fluorescent rotator Since the distance from the rotation axis of the fluorescent rotator is different for each of the plurality of solid state light sources, when a plurality of locations of the fluorescent rotator are irradiated with a plurality of light sources to obtain a large amount of light, an increase in motor sound Fluorescence rotation so as to cause Provided are a light source device and an illuminating device that can prevent the color break phenomenon without increasing the rotation speed of the light source and can reduce the deterioration of the fluorescent material of the fluorescent rotator. can do.

In particular, in the inventions according to claim 3 and claim 4 , in the transmission type fluorescent rotator, the light emitted from the solid light source is transmitted to the solid light source side from the phosphor layer of the fluorescent rotator, and the light emitted from the phosphor layer. By providing an optical means (bandpass filter) that reflects the light, and in the case of a reflection type fluorescent rotator, a reflective surface is formed on the substrate on which the phosphor layer of the fluorescent rotator is disposed, thereby improving efficiency. A high light source device and a lighting device can be provided.

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 for demonstrating the light source device of the prior application of this application. 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 sectional drawing in the BB line 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 sectional drawing of a reflection type fluorescence rotary body. 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 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 sectional drawing in the CC line | wire 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 sectional drawing of a reflection type fluorescence rotary body. 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 the other structural example of a fluorescence rotary body. 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. 23, FIG. FIG. 26 is a cross-sectional view when the fluorescent rotator of FIG. 25 is a transmissive fluorescent rotator. FIG. 26 is a cross-sectional view when the fluorescent rotator of FIG. 25 is a reflective fluorescent rotator. 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 plurality of phosphors that can rotate around a rotation axis and emit fluorescence of different colors when irradiated with ultraviolet light. A plurality of solid-state light sources arranged such that ultraviolet light from the plurality of solid-state light sources simultaneously irradiates a plurality of phosphor regions that emit fluorescence of different colors. The distance between the optical axis of the plurality of solid state light sources and the fluorescence rotator from the axis of rotation of the fluorescence rotator is different for each of the plurality of solid state light sources.

  More preferably, the ultraviolet light from the plurality of solid-state light sources simultaneously irradiates a plurality of phosphor regions that emit fluorescence of different colors.

  The phosphor region is a region having a phosphor layer. When a bandpass filter, an adjustment layer, or the like is provided corresponding to the phosphor layer as described later, the phosphor region is combined with the phosphor layer. , Including these. In the following, for the sake of convenience, the same reference numerals are assigned to the phosphor layers and the corresponding phosphor regions.

  FIG. 5 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. 5, this light source device 10 includes three solid light sources 5 a, 5 b, 5 c that emit ultraviolet light, and a fluorescent rotator 1 that can rotate around a rotation axis X (rotated by a motor 4). I have. 6 is a diagram (plan view) showing an example of the fluorescent rotator 1 used in the light source device 10 of FIG. 5 (note that the positions of the solid light sources 5a, 5b, and 5c are also shown in FIG. ). In the example of FIG. 6, the fluorescent rotator 1 is the same as that of FIGS. 1 and 4. When a transparent substrate (for example, a quartz glass substrate) is irradiated with ultraviolet light, red, green, and blue fluorescence are emitted. The phosphor layers 2a, 2b, and 2c that respectively emit light are arranged as three divided regions (regions equally divided into three). As shown in FIG. 6, in the light source device 10 of FIG. 5, the three solid light sources 5 a, 5 b, 5 c have three ultraviolet light from the three solid light sources 5 a, 5 b, 5 c at the same time. It arrange | positions so that all the fluorescent substance layers 2a, 2b, and 2c may be irradiated.

  Further, in the light source device 10 of FIG. 5, the three solid light sources 5 a, 5 b, 5 c have the rotation axis X of the fluorescent rotator 1 at the intersection of the optical axes of the three solid light sources 5 a, 5 b, 5 c and the fluorescent rotator 1. Is different for each of the three solid-state light sources 5a, 5b, 5c. Schematically, as shown in FIG. 6, three solid light sources 5 a, 5 b, and 5 c are arranged at different distances from the rotation axis X of the fluorescent rotator 1.

  In the configuration of FIGS. 5 and 6, 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. 6 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. 6, when a fluorescent rotator divided into three equal parts is excited with the same number of light sources divided into three equal parts at an angular interval of 120 °, the red, green, and blue colors are always generated at a certain moment. Since three fluorescent colors emit light and this relationship is always maintained, a light source device that does not feel any color break can be realized.

  Further, in the configuration of FIGS. 5 and 6, the three solid light sources 5 a, 5 b, and 5 c are the rotation axes of the fluorescent rotator 1 at the intersection of the optical axes of the three solid light sources 5 a, 5 b, and 5 c and the fluorescent rotator 1. Since the distance from X is different for each of the three solid light sources 5a, 5b, and 5c (schematically, as shown in FIG. 6, the three solid light sources 5a, 5b, and 5c are Since they are arranged at different distances from the rotation axis X), the light from the individual solid light sources 5a, 5b, 5c irradiates the concentric circles of different radii of the fluorescent rotator 1, and the fluorescent rotator. 1 can be reduced.

  In the light source device 10 shown in FIG. 5, the fluorescent rotator 1 is configured as a transmission type, and the phosphor layers 2a, 2b, 2c are excited by the excitation light from the solid light sources 5a, 5b, 5c. Of the emitted light, light emitted to the side opposite to the solid light sources 5a, 5b, 5c side is used. Hereinafter, this type of fluorescent rotator is referred to as a transmission type fluorescent rotator. Here, considering the emitted light from each of the phosphor layers 2a, 2b, 2c, together with the transmitted light (light emitted to the side opposite to the solid light sources 5a, 5b, 5c side), the phosphor layers 2a, 2b, There is also light emission reflected by 2c and returning to the solid light sources 5a, 5b, 5c, that is, reflected light. In a fluorescent rotator in which a phosphor layer is simply arranged in the phosphor region, this reflected light becomes light that cannot be used as illumination light.

  When a transmission type fluorescent rotator is used as the fluorescent rotator 1, the reflected light from the phosphor layers 2 a, 2 b, 2 c is used as illumination light, as shown in FIG. , An optical means (band) that transmits ultraviolet light and reflects visible light from the phosphor layers 2a, 2b, and 2c of the phosphor rotator 1 to the solid light sources 5a, 5b, and 5c side. Pass filter) 12 may be provided. More specifically, the phosphor layers 2a, 2b, 2c of the fluorescent rotator 1 are arranged on the surface of the substrate 11 opposite to the solid light sources 5a, 5b, 5c side, and the solid light sources 5a, 5b. , 5c side is provided with optical means (bandpass filter) 12 that transmits ultraviolet light and reflects visible light (red light, green light, or blue light). An optical means (bandpass filter) 12 that transmits ultraviolet light and reflects visible light (red light, green light, or blue light) is provided on the surface of the substrate 11 on the solid light sources 5a, 5b, and 5c side. The emitted light that is reflected by the phosphor layers 2a, 2b, and 2c and returns to the solid light sources 5a, 5b, and 5c, that is, reflected light, can also be used as illumination light. That is, a highly efficient light source device can be realized.

  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.

  FIG. 8 is a diagram (schematic front view) showing another configuration example of the light source device according to the first embodiment of the present invention. In FIG. 8, portions corresponding to those in FIG. Similarly to the light source device 10 of FIG. 5, the light source device 30 of FIG. 8 can also be rotated around the rotation axis X (rotated by the motor 4) and the three solid light sources 5a, 5b, and 5c that emit ultraviolet light. And a fluorescent rotator 21. Here, the phosphor rotator 21 is provided with phosphor layers 2a, 2b, and 2c (phosphor layers that emit red, green, or blue fluorescence when irradiated with ultraviolet light) as phosphor regions shown in FIG. In the light source device 30 of FIG. 8, the fluorescent rotator 21 is configured as a reflection type, and the respective phosphor layers 2a and 2b excited by the excitation light from the solid light sources 5a, 5b, and 5c. , 2c, light emitted to the solid light sources 5a, 5b, 5c side is used. Hereinafter, this type of fluorescent rotator is referred to as a reflective fluorescent rotator. Here, considering the emitted light from the phosphor layers 2a, 2b, 2c, together with the light reflected with respect to the incident excitation light, the phosphor layers 2a, 2b, 2c are multiple-reflected by the solid light sources 5a, 5b, 5c and There is also light emission that is transmitted to the opposite side and light that is not excited by the phosphor layers 2a, 2b, and 2c and is transmitted to the opposite side of the solid light sources 5a, 5b, and 5c as excitation light. If the substrate on which the phosphor layers 2a, 2b, and 2c of the fluorescent rotator 21 are arranged is transparent, these lights become transmitted light that passes through the back side of the fluorescent rotator 21 and cannot be used as illumination light. End up.

  When the reflection type fluorescent rotator 21 is used, the transmitted light from the phosphor layers 2a, 2b, 2c is used as illumination light, as shown in FIG. 9 (FIG. 9 shows FIG. 7 (transmission type fluorescent rotator). The substrate 31 itself of the fluorescent rotator 21 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 fluorescence rotator 21 are arranged. Specifically, a metal film can be disposed on a transparent substrate. Thereby, a highly efficient light source device is realizable.

  In the reflection-type fluorescent rotator 21 as well, similarly to the transmissive fluorescent rotator 1, it is necessary to design a fluorescent rotator that takes into account the conversion efficiency from excitation light to fluorescence in the phosphor layer in the phosphor region. There is.

  The light source device 30 of FIG. 8 also has three solid light sources 5a, 5b, and 5c that emit ultraviolet light when rotating the fluorescent rotator 21 by the motor 4 to obtain white light by mixing three colors of red, green, and blue. At the same time, they are arranged to irradiate different phosphor layers 2a, 2b, and 2c, so that when a plurality of light sources irradiate a plurality of locations on a fluorescent rotator to obtain a large amount of light, an increase in motor sound The color break phenomenon can be prevented without increasing the rotation speed of the fluorescent rotator so as to cause the above.

  For example, when irradiating a fluorescent rotating body having three red, green, and blue phosphor regions shown in FIG. 6 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. 6, when a fluorescent rotator divided into three equal parts is excited with the same number of light sources divided into three equal parts at an angular interval of 120 °, the red, green, and blue colors are always generated at a certain moment. Since three fluorescent colors emit light and this relationship is always maintained, a light source device that does not feel any color break can be realized.

  Further, in the configuration of FIGS. 8 and 6, the three solid light sources 5 a, 5 b, and 5 c are the rotation axes of the fluorescent rotator 21 at the intersection of the optical axes of the three solid light sources 5 a, 5 b, and 5 c and the fluorescent rotator 21. Since the distance from X is different for each of the three solid light sources 5a, 5b, 5c (roughly, as shown in FIG. 6, the three solid light sources 5a, 5b, 5c Since they are arranged at different distances from the rotation axis X), the light from the individual solid light sources 5a, 5b, 5c irradiates the concentric circles of different radii of the fluorescent rotator 21, and the fluorescent rotator. The deterioration of the phosphor 21 can be reduced.

  FIG. 10 is a diagram (schematic front view) showing another configuration example of the light source device according to the first embodiment of the present invention. In FIG. 10, the same reference numerals are given to the portions corresponding to FIG.

  Referring to FIG. 10, the light source device 35 includes three solid light sources 5a, 5b, and 5c that emit ultraviolet light, and a cone-shaped fluorescent rotator that is rotatable about a rotation axis X (rotated by a motor 4). 21. That is, in the configuration example of FIG. 8, a flat fluorescent rotator is used for the fluorescent rotator 21, but in the configuration example of FIG. 10, a conical fluorescent rotator is used for the fluorescent rotator 21. 11 is a diagram (plan view) showing an example of the fluorescent rotator 21 (that is, the conical fluorescent rotator 21) used in the light source device 35 of FIG. 10 (in FIG. 11, the solid light source 5a is shown). , 5b, 5c are also shown). In the example of FIG. 11, the fluorescent rotator 21 is a region in which phosphor layers 2a, 2b, and 2c that emit red, green, and blue fluorescence when irradiated with ultraviolet light on a conical substrate are divided into three regions. It is arranged as (a region divided into three equal parts). In the light source device 35 of FIG. 10, the three solid light sources 5a, 5b, 5c are arranged at different height positions (according to this, as shown in FIG. 11, the three solid light sources 5a, 5b, 5c Are arranged at different distances from the rotation axis X of the fluorescent rotator 21), and the three solid light sources 5a, 5b, 5c are three solid light sources 5a, 5b, 5c, as shown in FIG. The ultraviolet light emitted in the direction of the arrow A1 from 5c is arranged so as to irradiate all three phosphor layers 2a, 2b, 2c at the same time.

  Further, in the light source device 35 of FIG. 10, the conical fluorescent rotator 21 is configured as a reflective type (that is, as a reflective fluorescent rotator), and is emitted from the solid light sources 5a, 5b, and 5c in the direction of the arrow A1. Of the light emitted from the phosphor layers 2a, 2b and 2c excited by the ultraviolet light (excitation light), the light reflected by the cone-shaped fluorescent rotating body 21 and emitted in the direction of arrow A2 is used as illumination light. It can be used. Here, since the conical fluorescent rotator 21 is a reflection type fluorescent rotator, the substrate on which the phosphor layers 2a, 2b, and 2c of the fluorescent rotator 21 are disposed is made of metal as described in FIG. Can be made. 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. As described above, in the reflection type fluorescent rotator 21 as well, as in the case of the transmission type fluorescent rotator 1, the fluorescence in consideration of the conversion efficiency from excitation light to fluorescence in the phosphor layer in the phosphor region is taken into consideration. It is necessary to design a rotating body.

  10 and 11, when the white light is obtained by mixing the three colors of red, green and blue by rotating the fluorescent rotator 21 by the motor 4, the three solid light sources 5 a, 5 b and 5 c that emit ultraviolet light. 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.

  Furthermore, in the configuration of FIGS. 10 and 11, the three solid light sources 5 a, 5 b, and 5 c are the rotation axes of the fluorescent rotator 21 at the intersection of the optical axes of the three solid light sources 5 a, 5 b, and 5 c and the fluorescent rotator 21. Since the distance from X is different for each of the three solid light sources 5a, 5b, and 5c (more specifically, the three solid light sources 5a, 5b, and 5c are arranged at different height positions, and accordingly, As shown in FIG. 11, the three solid light sources 5a, 5b, and 5c are arranged at different distances from the rotation axis X of the cone-shaped fluorescent rotator 21), so that the individual solid light sources 5a, 5b, The light from 5c irradiates concentric circles of different radii of the cone-shaped fluorescence rotator 21, and the deterioration of the phosphor of the cone-shaped fluorescence rotator 21 can be reduced.

  Further, in the configurations of FIGS. 10 and 11, since the conical reflection type fluorescent rotator is used, for example, the apex angle of the cone is set to 90 degrees (the tilt 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 devices 10, 30, and 35 of the first embodiment of the present invention will be described in more detail.

  In the light source devices 10, 30, and 35 according to the first embodiment of the present invention, the solid light sources 5a, 5b, and 5c can 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.

  The fluorescent rotators 1 and 21 have phosphor layers 2a, 2b, and 2c corresponding to red, green, and blue emission colors, as shown in FIGS. 6 and 11, each color having the same shape (area). It is possible to use one that has been separately painted (so that each color 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. For the separate coating, a printing method using a screen having openings (metal mesh openings) corresponding to the respective phosphor layer patterns can be used. In addition, a transparent substrate (such as a quartz glass substrate) is used as the substrate 11 of the transmissive fluorescent rotator 1, and a metal substrate such as aluminum can be used as the substrate 31 of the reflective fluorescent rotator 21.

  Here, the solid light sources 5a, 5b, and 5c have the same angle around the rotation axis X of the fluorescent rotators 1 and 21 with respect to the fluorescent rotator having the same shape (each color is divided into three equal parts). They are arranged at intervals (an angular interval of 120 °). By adopting such an arrangement, it is possible to create a state in which all the colors of the fluorescent rotator always emit light simultaneously. However, as described above, the three solid light sources 5a, 5b, and 5c are the rotation axes of the fluorescent rotators 1 and 21 at the intersections of the optical axes of the three solid light sources 5a, 5b, and 5c and the fluorescent rotators 1 and 21, respectively. The distance from X is different for each of the three solid light sources 5a, 5b, and 5c (in general, the three solid light sources 5a, 5b, and 5c are different from the rotation axes X of the fluorescent rotators 1 and 21, respectively). Is placed at a distance).

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 ) ₈ : 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 includes (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: be used ^{Ce 3+,} etc. it can.

In the transmission type fluorescent rotator 1 shown in FIG. 7, phosphor layers 2a, 2b, 2c are provided on the surface of the transparent quartz glass substrate 11 opposite to the solid light sources 5a, 5b, 5c, and the solid light source 5a. , 5b, 5c side, optical means (bandpass filter) 12 is arranged. Here, the band pass filter 12 includes a dielectric multilayer film (specifically, a high refractive index material (TiO ₂ , LaTiO, Ta ₂ O ₅₎ designed to transmit ultraviolet light and reflect visible light. , Nb ₂ O _5, etc.) and a low-refractive-index material (SiO ₂ , MgF _2, etc.) can be used.

  Further, in the reflection type fluorescent rotator 21 shown in FIG. 9, the phosphor layers 2 a, 2 b, 2 c are arranged on the aluminum metal substrate 31. When a transparent material such as a quartz glass substrate is used as the substrate 31, a metal film such as aluminum needs to be formed on the substrate 31 as a reflective surface by a method such as vapor deposition. When a metal substrate such as aluminum as shown in FIG. 9 is used, a new reflective surface is not required.

  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. 12, the number of solid light sources is two for the three phosphor layers 2a, 2b, and 2c on the phosphor rotator, and the two solid light sources 5a and 5b are simultaneously provided with three phosphors. In the case where two phosphor layers of the layers 2a, 2b, and 2c are irradiated and the two solid light sources 5a and 5b are arranged at different distances from the rotation axis X of the fluorescence rotator, It is included in the scope of the present invention. Note that this case is inferior to the case shown in FIG. 6, for example, but the color break phenomenon can be significantly prevented as compared with the case shown in FIG. 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. 13 (a) and 13 (b). (Also in this case, the three solid light sources 5a, 5b and 5c are arranged at different distances from the rotation axis X of the fluorescent rotator) 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. An area and a non-phosphor area in which no phosphor is arranged are divided into areas, and includes a fluorescent rotator that can rotate around a rotation axis, and light from the plurality of solid-state light sources The plurality of solid light sources are arranged so as to simultaneously irradiate two or more regions of the phosphor region and the non-phosphor region, and an intersection of an optical axis of the plurality of solid light sources and the fluorescent rotator The distance from the rotation axis of the fluorescent rotator is different for each of the plurality of solid-state light sources.

  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 a bandpass filter, an adjustment layer, or the like is provided corresponding to the phosphor layer as described later, the phosphor region is combined with the phosphor layer. , Including these. 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. 14: is a figure (schematic front view) which shows the example of 1 structure of the light source device of the 2nd Embodiment of this invention. In FIG. 14, the same reference numerals are given to the same portions as in FIG. 5. Referring to FIG. 14, the light source device 50 is rotatable around a rotation axis X (rotated by the motor 4) and three solid light sources 45 a, 45 b, 45 c that emit visible light (for example, blue light). And a fluorescent rotator 41. 15 is a diagram (plan view) showing an example of the fluorescent rotator 41 used in the light source device 50 of FIG. 14 (note that the positions of the solid light sources 45a, 45b, and 45c are also shown in FIG. ). In the example of FIG. 15, the fluorescent rotator 41 emits red and green fluorescence when irradiated with visible light (eg, blue light) on a transparent substrate (eg, quartz glass substrate), respectively. Are arranged as two divided phosphor regions, and a region 42c not provided with a phosphor layer is arranged 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. 15, in the light source device 50 of FIG. 14, the three solid light sources 45a, 45b, 45c are visible light (for example, blue light) from the three solid light sources 45a, 45b, 45c. Are arranged to irradiate all three regions 42a, 42b, 42c at the same time.

  Further, in the light source device 50 of FIG. 14, the three solid light sources 45 a, 45 b, 45 c have the rotation axis X of the fluorescent rotator 41 at the intersection of the optical axes of the three solid light sources 45 a, 45 b, 45 c and the fluorescent rotator 41. Is different for each of the three solid light sources 45a, 45b, 45c. Schematically, as shown in FIG. 15, three solid light sources 45 a, 45 b, and 45 c are arranged at different distances from the rotation axis X of the fluorescent rotator 41.

  14 and 15, the color of solid light sources 45a, 45b, and 45c that emit visible light (for example, blue light) (blue in this example) 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.

  Furthermore, in the configuration of FIGS. 14 and 15, the three solid light sources 45 a, 45 b, 45 c are the rotation axes of the fluorescent rotator 41 at the intersection of the optical axes of the three solid light sources 45 a, 45 b, 45 c and the fluorescent rotator 41. Since the distance from X is different for each of the three solid light sources 45a, 45b, 45c (roughly, as shown in FIG. 15, the three solid light sources 45a, 45b, 45c (Because they are arranged at different distances from the rotation axis X), the light from the individual solid light sources 45a, 45b, 45c irradiates the concentric circles of different radii of the fluorescent rotator 41. The deterioration of the phosphor 41 can be reduced.

  In the light source device 50 shown in FIG. 14, the fluorescent rotator 41 is configured as a transmission type, and two phosphor regions (phosphor layer 42a) excited by excitation light from the solid light sources 45a, 45b, 45c. , 42b) of the light emitted from the solid light sources 45a, 45b, 45c and the visible light solid light sources (blue solid light sources) 45a, 45b, 45c that pass through the non-phosphor region 42c. Light is used. Hereinafter, this type of fluorescent rotator is referred to as a transmission type fluorescent rotator. Here, when the emitted light from each of the phosphor layers 42a and 42b is considered, it is reflected by the phosphor layers 42a and 42b together with the transmitted light (the light emitted to the side opposite to the solid light sources 45a, 45b, and 45c). There is also light emission returning to the solid light sources 45a, 45b, and 45c, that is, reflected light. In a fluorescent rotator in which a phosphor layer is simply arranged in the phosphor region, this reflected light becomes light that cannot be used as illumination light.

  When a transmission type fluorescent rotator is used as the fluorescent rotator 41, the reflected light from the phosphor layers 42a and 42b is used as illumination light. As shown in FIG. -Is a cross-sectional view taken along line C), and the light emitted from the solid light sources 45a, 45b, and 45c is transmitted from the phosphor layers 42a and 42b of the fluorescent rotator 41 to the solid light sources 45a, 45b, and 45c side. An optical means (bandpass filter) 52 for reflecting the light emitted by 42b can be provided. More specifically, the phosphor layers 42a and 42b of the fluorescent rotator 41 are disposed on the surface of the substrate 51 opposite to the solid light sources 45a, 45b and 45c, and the substrate 51 on the solid light source 45 side. On the surface, there is optical means (bandpass filter) 52 that transmits light (blue light) emitted from the solid light sources 45a, 45b, and 45c and reflects light (red light and green light) emitted from the phosphor layers 42a and 42b. Is provided. Optical means (bandpass filter) 52 that transmits light (blue light) emitted from the solid light sources 45a, 45b, and 45c and reflects light (red light and green light) emitted from the phosphor layers 42a and 42b is provided. Thus, the light that is reflected by the phosphor layers 42a and 42b and returns to the solid light sources 45a, 45b, and 45c, that is, the reflected light can also be used as illumination light. That is, a highly efficient light source device can be realized.

  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 42 c have a scattering property, the surface of the substrate 51 of the fluorescent rotator 41 is finely uneven, or a scattering layer mixed with a scattering material is formed on the substrate 51 of the fluorescent rotator 41. A method of arrangement is conceivable.

  FIG. 17 is a diagram illustrating another configuration example of the light source device according to the second embodiment of the present invention. In FIG. 17, the same reference numerals are given to the portions corresponding to those in FIG. 14. Similarly to the light source device 50 of FIG. 14, the light source device 70 of FIG. 17 is also rotatable around three rotation sources X and three solid light sources 45 a, 45 b, 45 c that emit visible light (for example, blue light) ( And a fluorescent rotator 61 (rotated by the motor 4). Here, as shown in FIG. 15, the fluorescent rotator 61 includes phosphor layers (phosphor layers that emit red or green fluorescence when irradiated with visible light (for example, blue light)) 42 a and 42 b. 17 is used, and the region 42c not provided with the phosphor layer is used as a non-phosphor region. However, in the light source device 70 of FIG. 17, the fluorescent rotator 61 is configured as a reflection type. Of the light emitted from the phosphor regions (phosphor layers) 42a and 42b excited by the excitation light from the solid light sources 45a, 45b and 45c and emitted to the solid light sources 45a, 45b and 45c (red light) , Green light) and visible light solid light sources (blue solid light sources) 45a, 45b, 45c (blue light) reflected by the non-phosphor region 42c are used. 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 reflected with respect to the incident excitation light and multiple reflected by the phosphor layers 42a and 42b are transmitted to the opposite side of the solid light sources 45a, 45b and 45c. There is also light emitted and light that does not excite the phosphor layers 42a and 42b and transmits to the opposite side of the solid light sources 45a, 45b, and 45c as excitation light. If the substrate on which the phosphor layers 42a and 42b of the fluorescent rotator 61 are disposed is transparent, these lights become transmitted light that passes through the back side of the fluorescent rotator and cannot be used as illumination light.

  When the reflection type fluorescent rotator 61 is used, the transmitted light from the phosphor layers 42a and 42b is used as illumination light, as shown in FIG. 18 (FIG. 18 shows FIG. 16 (transmission type fluorescent rotator). The substrate 71 of the fluorescent rotator 61 itself can be made of metal. Alternatively, a reflective surface can be provided on the substrate on which the phosphor layers 42a and 42b of the fluorescence rotator 61 are arranged. Specifically, a metal film can be disposed on a transparent substrate.

  In the reflection-type fluorescent rotator 61 as well, like the transmissive fluorescent rotator 41, it is necessary to design a fluorescent rotator that takes into account the conversion efficiency from excitation light to fluorescence in the phosphor layer in the phosphor region. There is. An adjustment layer or the like is disposed in the non-phosphor region.

  The light source device 70 of FIG. 17 is also excited by the color of the solid light sources 45a, 45b, and 45c (in this example, blue) that emit visible light (for example, blue light) and the solid light sources 45a, 45b, and 45c. , 45b, 45c, the three solid-state light sources 45a, 45b, 45c that emit blue light are different at the same time when obtaining white light by mixing with fluorescent colors (red and green) having a longer wavelength than the emission wavelengths of Since the regions 42a, 42b, and 42c are arranged so as to irradiate, when a plurality of light sources irradiate a plurality of locations on the fluorescent rotator to obtain a large amount of light, the rotation of the fluorescence causes an increase in motor sound. The color break phenomenon can be prevented without increasing the rotational speed of the body.

  Furthermore, in the configuration of FIGS. 17 and 15, the three solid light sources 45 a, 45 b, 45 c are the rotation axes of the fluorescent rotator 61 at the intersection of the optical axes of the three solid light sources 45 a, 45 b, 45 c and the fluorescent rotator 61. Since the distance from X is different for each of the three solid light sources 45a, 45b, 45c (roughly, as shown in FIG. 15, the three solid light sources 45a, 45b, 45c (Because they are arranged at different distances from the rotation axis X), the light from the individual solid light sources 45a, 45b, 45c irradiates the concentric circles of different radii of the fluorescent rotator 61. It is possible to reduce the deterioration of the 61 phosphor.

  Moreover, FIG. 19 is a figure (schematic front view) which shows the other structural example of the light source device of the 2nd Embodiment of this invention. In FIG. 19, the same reference numerals are given to the portions corresponding to those in FIG. 17.

  Referring to FIG. 19, the light source device 75 includes three solid light sources 45 a, 45 b, 45 c that emit visible light (for example, blue light), and a cone that can rotate around the rotation axis X (rotated by the motor 4). And a fluorescent rotating body 61 having a shape. That is, in the configuration example of FIG. 17, a flat fluorescent rotator is used as the fluorescent rotator 61, but in the configuration example of FIG. 19, a conical fluorescent rotator is used as the fluorescent rotator 61. 20 is a diagram (plan view) showing an example of a fluorescent rotator 61 (in FIG. 19, a conical fluorescent rotator 61) used in the light source device 75 of FIG. 19 (note that FIG. 20 shows a solid state). The positions of the light sources 45a, 45b, 45c are also shown). In the example of FIG. 20, the fluorescent rotator 61 is a phosphor in which phosphor layers 42a and 42b 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. In the light source device 75 of FIG. 19, the three solid light sources 45a, 45b, 45c are arranged at different height positions (according to this, as shown in FIG. 20, the three solid light sources 45a, 45b, 45c The three solid light sources 45a, 45b, 45c are arranged at three different distances from the rotation axis X of the fluorescent rotator 61, as shown in FIG. Visible light (for example, blue light) emitted from 45c in the direction of arrow A1 is arranged so as to irradiate all three regions 42a, 42b, 42c at the same time.

  In the light source device 75 of FIG. 19, the conical fluorescent rotator 61 is configured as a reflection type (that is, as a reflective fluorescent rotator), and is emitted from the solid light sources 45a, 45b, and 45c in the direction of the arrow A1. Of the light from each of the regions 42a, 42b, and 42c by the visible light (for example, blue light), the light reflected by the conical fluorescent rotating body 61 and emitted in the direction of the arrow A2 can be used as illumination light. It has become. Here, since the conical fluorescent rotator 61 is a reflective fluorescent rotator, the substrate itself of the fluorescent rotator 61 can be made of metal as described with reference to FIG. Alternatively, a reflective surface can be provided on the substrate on which the phosphor layers 42a and 42b of the fluorescence rotator 61 are arranged. Specifically, a metal film can be disposed on a transparent substrate. Thereby, a highly efficient light source device is realizable. As described above, in the reflection type fluorescent rotator 61 as well, as in the case of the transmission type fluorescent rotator 41, the fluorescence in consideration of the conversion efficiency from the excitation light to the fluorescence in the phosphor layer in the phosphor region. It is necessary to design a rotating body.

  19 and 20, three solid-state light sources that emit visible light (for example, blue light) when rotating the fluorescent rotator 61 by the motor 4 to obtain white light by mixing three colors of red, green, and blue. 45a, 45b, and 45c are arranged so as to irradiate different regions 42a, 42b, and 42c at the same time, so when a plurality of locations of the fluorescent rotator are irradiated with a plurality of light sources to obtain a large amount of light, The color break phenomenon can be prevented without increasing the rotation speed of the fluorescent rotator so as to increase the motor sound.

  Further, in the configuration of FIGS. 19 and 20, the three solid light sources 45 a, 45 b, 45 c are the rotation axes of the fluorescent rotator 61 at the intersection of the optical axes of the three solid light sources 45 a, 45 b, 45 c and the fluorescent rotator 61. Since the distance from X is different for each of the three solid light sources 45a, 45b, and 45c (more specifically, the three solid light sources 45a, 45b, and 45c are arranged at different height positions, and accordingly, As shown in FIG. 20, the three solid light sources 45a, 45b, and 45c are arranged at different distances from the rotation axis X of the conical fluorescent rotator 61), so that the individual solid light sources 45a, 45b, The light from 45c irradiates concentric circles having different radii of the cone-shaped fluorescence rotator 61, and deterioration of the phosphor of the cone-shaped fluorescence rotator 61 can be reduced.

  Further, in the configurations of FIGS. 19 and 20, 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 devices 50, 70, and 75 according to the second embodiment of the present invention will be described in more detail.

  In the light source devices 50, 70, and 75 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.

  Further, as shown in FIGS. 15 and 20, the fluorescent rotators 41 and 61 include two phosphor regions (phosphor layers 42a and 42b) that emit red and green light by blue excitation light and non-phosphor regions. 42c can be used so that each region 42a, 42b, 42c has the same shape (area) (so that each region 42a, 42b, 42c is divided into three equal parts). 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 42c, the adjustment layer described above is provided with a pigment that partially absorbs blue light and adjusts the transmittance of blue light. The adjustment layer arranged in the non-phosphor region and the phosphor region can be separately applied by a printing method using a screen having openings (metal mesh openings) corresponding to the patterns of the respective regions. Further, a transparent substrate (such as a quartz glass substrate) is used as the substrate 51 of the transmissive fluorescent rotator 41, and a metal substrate such as aluminum can be used as the substrate 71 of the reflective fluorescent rotator 61.

  Here, each of the regions 42a, 42b, 42c has the same shape (each region 42a, 42b, 42c is divided into three equal parts). The fluorescent rotating bodies 41 and 61 are arranged at the same angular interval (120 ° angular interval) with the rotation axis X as the center. By adopting such an arrangement, it is possible to create a state where all the regions 42a, 42b, 42c of the fluorescent rotators 41, 61 are always emitting light at the same time.

The phosphor layers 42a and 42b are excited by blue light having a wavelength of about 440 nm to about 470 nm. For example, the red phosphor layer 42a has CaAlSiN ₃ : Eu ²⁺ and Ca ₂ Si ₅ N _8. : Eu ²⁺ , KSiF ₆ : Mn ⁴⁺ , KTiF ₆ : Mn ^{4+ and the} like can be used, and the green phosphor layer 42b has 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.

In the transmission type fluorescent rotator 41 shown in FIG. 16, phosphor layers 42a and 42b are provided on the surface of the transparent quartz glass substrate 51 opposite to the solid light sources 45a, 45b and 45c, and the solid light sources 45a and 45b are provided. , 45c side, optical means (band pass filter) 52 is arranged. Here, the bandpass filter 52 is a dielectric multilayer film (specifically, a high refractive index material (TiO ₂ , LaTiO, Ta ₂₎ designed to transmit blue light and reflect red and green light. O _{5, Nb} 2 _{O 5,} etc.) and a low refractive index material _{(SiO 2,} MgF 2, etc.) and can be used a band-pass filter consisting of film) are alternately stacked. For example, an adjustment layer is disposed in a region corresponding to the non-phosphor region 42c, and no bandpass filter is disposed.

  Further, in the reflection type fluorescent rotator 61 shown in FIG. 18, the phosphor layers 42 a and 42 b are arranged on the aluminum metal substrate 71. When a transparent material such as a quartz glass substrate is used for the substrate 71, it is necessary to form a metal film such as aluminum as a reflective surface on the substrate 71 by a method such as vapor deposition. When a metal substrate such as aluminum as shown in FIG. 15 is used for the substrate 71, it is not necessary to newly form a reflecting surface.

  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. 21, the number of solid light sources is two 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, and two solid-state light sources 45a and 45b are disposed at different distances from the rotation axis X of the fluorescent rotator, respectively, within the scope of the present invention. It is. 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. When the solid light sources 45a, 45b, and 45c are arranged as shown in FIG. 22 (a) and FIG. 22 (b) (in this case, three solids are also provided). The light sources 45a, 45b, and 45c are arranged at different distances from the rotation axis X of the fluorescent rotator), and the like are also included in the scope of the present invention.

  In the above example, the fluorescent rotator shown in FIGS. 15 and 22 is used as the fluorescent rotator. However, as the fluorescent rotator in the second embodiment, for example, one fluorescent region and one non-fluorescent material are used. 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 fluorescent rotator formed in two regions is also possible. FIG. 23 and FIG. 24 are diagrams showing a configuration example of such a light source device. Note that the light source device 88 of FIG. 23 is configured such that the fluorescent rotator 72 is a transmission type, and the light source device 89 of FIG. 24 is configured such that the fluorescent rotator 73 is a reflection type. 23 and 24, the same reference numerals are assigned to the same portions as those in FIGS.

  Referring to FIGS. 23 and 24, the light source devices 88 and 89 include two solid-state light sources 45 a and 45 b that emit visible light (for example, blue light), and can rotate around the rotation axis X (by the motor 4. Rotating fluorescent rotators 72 and 73. 25 is a diagram (plan view) showing an example of the fluorescent rotators 72 and 73 used in the light source device 88 of FIG. 23 (note that the positions of the solid light sources 45a and 45b are also shown in FIG. 25). ). In the example of FIG. 25, the fluorescent rotators 72 and 73 are arranged on a substrate with a phosphor layer 74 that emits yellow fluorescence when irradiated with visible light (for example, blue light) as one phosphor region. A region 75 where no phosphor layer is provided is arranged as one non-phosphor region (that is, a yellow phosphor region 74 and a non-phosphor region 75 having a phosphor layer that emits yellow light by blue excitation light). And are arranged). 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. 25, in the light source devices 88 and 89 of FIGS. 23 and 24, the two solid light sources 45a and 45b are visible light (for example, blue light) from the two solid light sources 45a and 45b. ) Are arranged to irradiate the two regions 74 and 75 at the same time. That is, the solid-state light sources 45a and 45b have the same angular interval (180 °) around the rotation axis X of the fluorescent rotators 72 and 73 with respect to the fluorescent rotators 72 and 73 having the same shape in each region 74 and 75. Are arranged at angular intervals). By adopting such an arrangement, it is possible to always create a state in which all the regions 74 and 75 of the fluorescent rotators 72 and 73 are simultaneously emitting light. 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.

  Furthermore, in the light source devices 88 and 89 of FIGS. 23 and 24, the two solid light sources 45a and 45b are the fluorescent rotators 72 at the intersections of the optical axes of the two solid light sources 45a and 45b and the fluorescent rotators 72 and 73, The distance from the rotation axis X of 73 differs for each of the two solid light sources 45a and 45b. Schematically, as shown in FIG. 25, two solid light sources 45a and 45b are arranged at different distances from the rotation axis X of the fluorescent rotators 72 and 73, respectively.

  23, 24, and 25, the color of solid light sources 45a and 45b that emit visible light (for example, blue light) (in this example, blue) and the solid light sources 45a that are excited by the solid light sources 45a and 45b. , 45b, two solid light sources 45a, 45b emitting blue light simultaneously irradiate different regions 74, 75 simultaneously when obtaining white light by mixing with a fluorescent color (yellow) having a wavelength longer than the emission wavelength of 45b. Therefore, when a large amount of light is obtained by illuminating multiple locations on the fluorescent rotating body with multiple light sources, the rotational speed of the fluorescent rotating body should be increased so as to increase the motor sound. In addition, the color break phenomenon can be prevented.

  23, 24, and 25, the two solid light sources 45a and 45b are fluorescent rotators 72 and 73 at the intersections of the optical axes of the two solid light sources 45a and 45b and the fluorescent rotators 72 and 73, respectively. Is different for each of the two solid light sources 45a and 45b (schematically, as shown in FIG. 25, the two solid light sources 45a and 45b are fluorescent rotators 72 and 73). The light from the individual solid-state light sources 45a and 45b irradiates the concentric circles of different radii of the fluorescent rotators 72 and 73, respectively. Deterioration of the phosphors of the bodies 72 and 73 can be reduced.

  More specifically, in the light source devices 88 and 89 of FIGS. 23, 24, and 25, the solid light sources 45a and 45b include, 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 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.

  Further, in any of the fluorescent rotators 72 and 73, a screen having an opening (metal mesh opening) corresponding to the pattern of the phosphor region is used for forming the adjustment layer and the phosphor region arranged in the non-phosphor region. Printing method using can be used.

  Further, in the light source device 88 shown in FIG. 23, the fluorescent rotator 72 is configured as a transmission type, and from one phosphor region (phosphor layer 74) excited by excitation light from the solid light sources 45a and 45b. The light emitted from the solid light sources 45 a and 45 b and the light from the visible light solid light sources (blue solid light sources) 45 a and 45 b that pass through the non-phosphor region 75 are used. Hereinafter, this type of fluorescent rotator is referred to as a transmission type fluorescent rotator.

  Further, in the light source device 89 shown in FIG. 24, the fluorescent rotator 73 is configured as a reflection type, and the light from the single phosphor region (phosphor layer) 74 excited by the excitation light from the solid light sources 45a and 45b. Of the emitted light, light emitted to the solid light sources 45a and 45b (yellow light) and visible light solid light sources (blue solid light sources) 45a and 45b (blue light) reflected by the non-phosphor region 75 are used. . Hereinafter, this type of fluorescent rotator is referred to as a reflective fluorescent rotator.

  Here, when the fluorescent rotator is a transmission type fluorescent rotator 72, as shown in FIG. 26, a transparent substrate (such as a quartz glass substrate) is used as the substrate 76. In the case of the reflection type fluorescent rotating body 73, as shown in FIG. 27, a metal substrate such as aluminum can be used as the substrate 78.

In the transmission type fluorescent rotator 72 shown in FIG. 26, the phosphor layer 74 is disposed on the surface of the transparent quartz glass substrate 76 opposite to the solid light sources 45a and 45b, and on the surface on the solid light sources 45a and 45b side. An optical means (band pass filter) 77 is arranged. Here, the band-pass filter 77 has a dielectric multilayer film (specifically, a high refractive index material (TiO ₂ , LaTiO, Ta ₂ O ₅₎ designed to transmit blue light and reflect yellow light. , Nb ₂ O _5, etc.) and a low-refractive-index material (SiO ₂ , MgF _2, etc.) can be used. A bandpass filter is not disposed in a region corresponding to the non-phosphor region 75.

  In the reflection type fluorescent rotator 73 shown in FIG. 27, a phosphor layer 74 is disposed on an aluminum metal substrate 78. When a transparent substrate such as a quartz glass substrate is used as the substrate 78, a metal film such as aluminum needs to be formed by a method such as vapor deposition as the reflecting surface of the substrate 78. When a metal substrate such as aluminum as shown in FIG. 27 is used, it is not necessary to newly form a reflecting surface.

  In the light source device 89 shown in FIG. 24 and FIG. 25 described above, a flat fluorescent rotator is used as the fluorescent rotator 73. However, a conical fluorescent rotator can also be used as the fluorescent rotator 73. As described above, the two solid light sources 45a and 45b are arranged at different height positions, and according to this, the two solid light sources 45a and 45b are separated from the rotation axis X of the conical fluorescent rotator 73. By arranging them at different distances, the light from the individual solid-state light sources 45a and 45b irradiates concentric circles having different radii of the cone-shaped fluorescence rotator 73. Deterioration of the phosphor can be reduced.

  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. 28 and 29 are diagrams showing a case where two light sources are used in each region in the configuration examples of FIGS. 23 and 25. That is, in the example of FIGS. 28 and 29, two light sources 45a, 46a, 45b, and 46b are used for one phosphor region 74 and non-phosphor region 75, respectively. In this case as well, the light sources 45a and 46a and the light sources 45b and 46b are arranged at different distances from the rotation axis X of the fluorescent rotator. 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. 30 is a diagram illustrating a configuration example of an illumination device using the light source devices (10, 30, 35, 50, 70, 75, etc.) shown in the first and second embodiments. 30 includes a case 82 that forms the outline of the lighting device, a light source device (10, 30, 35, 50, 70, or 75) stored in the case 82, and a light source device (10, 30, 35, 50, 70, 75, etc.) and a lens system 83 that irradiates the light forward with a predetermined light distribution characteristic.

  FIG. 31 is a diagram showing another configuration example of an illumination device using the light source device (10, 30, 35, 50, 70, 75, etc.) shown in the first and second embodiments. 31 includes a case 84 that forms the outline of the lighting device, a light source device (10, 30, 35, 50, 70, or 75) stored in the case 84, and a light source device (10, 30, 35, 50, 70, 75, etc.) and a zoom lens system 85 that irradiates forward with a predetermined light distribution characteristic. In the illumination device of FIG. 26, 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. 30 and 31, by using the light source device of the present invention, it is possible to realize an illumination device that does not cause a color break with a large amount of light.

  Further, in the transmission type fluorescent rotator, optical means (bandpass filter) for transmitting light emitted from the solid light source and reflecting light emitted from the phosphor layer is provided closer to the solid light source side than the phosphor layer of the fluorescent rotator. In addition, in the reflection type fluorescent rotator, 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, 21, 41, 61, 72, 73 Fluorescent rotating body 2a, 2b, 2c, 42a, 42b, 74 Fluorescent substance region (phosphor layer)
42c, 75 Non-phosphor region 4 Motor 5a, 5b, 5c, 45a, 45b, 45c Solid light source 11, 31, 51, 71, 76, 78 Substrate 12, 52, 77 Optical means (bandpass filter)
10, 30, 35, 50, 70, 75 Light source device 82, 84 Case 83 Lens system 85 Zoom lens system

Claims (5)

A plurality of solid state light sources that emit ultraviolet light, and a fluorescence rotator that has a plurality of phosphor regions that can rotate around a rotation axis and emit fluorescence of different colors when irradiated with ultraviolet light, The plurality of solid light sources are arranged so that the ultraviolet light from the plurality of solid light sources simultaneously irradiates all of the plurality of phosphor regions emitting fluorescence of different colors, and the light of the plurality of solid light sources A light source device characterized in that a distance from an axis of rotation of the fluorescent rotator to an axis of rotation of the fluorescent rotator is different for each of the plurality of solid state light sources. 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 fluorescent rotator that is rotatable around a rotation axis, and the light from the plurality of solid state light sources is all in the phosphor region and the non-phosphor region. The plurality of solid light sources are arranged so as to simultaneously irradiate the region, and the distance between the optical axis of the plurality of solid light sources and the fluorescent rotator from the rotation axis of the fluorescent rotator is the plurality of solid light sources. A light source device characterized by being different for each light source. When the fluorescent rotator is a transmissive fluorescent rotator, the phosphor region of the fluorescent rotator includes a phosphor layer, a transparent substrate on which the phosphor layer is disposed, and the transparent substrate. than the phosphor layer is disposed on the solid state light source side, according to claim 1 or claims, characterized in that it has an optical means for reflecting the solid-state light source is transmitted through the light emitted the light phosphor layer emits Item 3. The light source device according to Item 2 . The reflective surface is provided in the board | substrate with which the said fluorescent substance layer of the said fluorescent rotator is arrange | positioned when the said fluorescent rotator is a reflection type fluorescent rotator. 4. The light source device according to any one of 3 . An illumination device, wherein the light source device according to any one of claims 1 to 4 is used.

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