JP6575580B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  An apparatus is known that emits fluorescence emitted from a phosphor to the outside by irradiating the phosphor with laser light (also called a laser beam) and exciting the phosphor (see, for example, Patent Documents 1 to 4).

Japanese Patent No. 4054594 JP 2004-354495 A Japanese Patent No. 5947350 Japanese Patent No. 5336564

By the way, the output of a laser light source is small compared with light emitting elements, such as LED.
Therefore, when a laser light source is used as the light source of the lighting device, for example, as described in Patent Documents 2 to 4, an output equivalent to the case where the light emitting element is used as the light source can be obtained by increasing the number of laser light sources included in the lighting device. can get.

On the other hand, an illuminating device usually includes an optical member such as a reflecting mirror or a lens for controlling illumination light, and the optical member is optically designed based on a predetermined light spot.
In addition, when an illuminating device that controls fluorescence generated by irradiating a phosphor with laser light is configured by an optical member, the light emission location of the phosphor, that is, the location where the laser beam is irradiated becomes the reference of the optical member. It is arranged at the predetermined light spot.

  However, when the illuminating device includes a plurality of laser light sources, each laser light of the laser light source is irradiated toward the predetermined light spot of the phosphor. If each irradiation spot shape varies, there is a problem that an error in controlling illumination light by the optical member becomes large, and illumination quality and efficiency are lowered.

  An object of this invention is to provide the illuminating device which can suppress the error of control by an optical member.

In order to achieve the above object, the present invention comprises a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, In the illumination device that illuminates with the fluorescence controlled by the optical member, each of the laser light emitting means has the same incident angle with respect to the optical axis as viewed from the phosphor disposed on the optical axis of the optical member. And the optical member is disposed around the optical axis of the optical member at the same distance, and the optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor, and the laser light emitting means Each is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and through the hole penetrating the reflecting mirror on the front and back. The body is irradiated with laser light, and the hole is formed in an annular slit shape in the reflective surface, and the bottom of the reflective surface is separable by the annular slit-shaped hole, and the bottom of the reflective surface Is provided with a moving means that moves in a direction away from the focal point of the reflecting surface along the optical axis .
The present invention comprises a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and the fluorescence controlled by the optical member In the illumination device that illuminates the optical member, each of the laser light emitting means has the same incident angle with respect to the optical axis and the same distance as viewed from the phosphor disposed on the optical axis of the optical member. The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor, and each of the laser light emitting means is viewed from the phosphor. Irradiating the phosphor with laser light through a hole that is on the back side of the reflection surface and is perpendicular to the optical axis of the reflection surface and penetrates the reflection mirror on the front and back sides; The reflective surface has a focal point, the phosphor is disposed at the focal point of the reflective surface, and the laser beam is incident on the phosphor at an incident angle of 10 degrees to 60 degrees with respect to the optical axis of the reflective surface. The illumination device is characterized in that the phosphor and the laser light emitting means move relative to the reflection surface along the optical axis of the reflection surface.
The present invention comprises a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and the fluorescence controlled by the optical member In the illumination device that illuminates the optical member, each of the laser light emitting means has the same incident angle with respect to the optical axis and the same distance as viewed from the phosphor disposed on the optical axis of the optical member. The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor, and each of the laser light emitting means is viewed from the phosphor. Irradiating the phosphor with laser light through a hole that is on the back side of the reflection surface and is perpendicular to the optical axis of the reflection surface and penetrates the reflection mirror on the front and back sides; The reflective surface has a bottom side reflection region and an open end side reflection region that are formed by dividing the same paraboloid into a bottom side and an open end side, and the phosphor is located at the focal point of the paraboloid. The open end side reflection region is arranged at a position shifted in the optical axis direction with respect to the bottom side reflection region so as to spread the reflected light reflecting the fluorescence of the phosphor. Provided is a lighting device.
The present invention comprises a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and the fluorescence controlled by the optical member In the illumination device that illuminates the optical member, each of the laser light emitting means has the same incident angle with respect to the optical axis and the same distance as viewed from the phosphor disposed on the optical axis of the optical member. The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor, and each of the laser light emitting means is viewed from the phosphor. Irradiating the phosphor with laser light through a hole that is on the back side of the reflection surface and is perpendicular to the optical axis of the reflection surface and penetrates the reflection mirror on the front and back sides; The laser light emitting means includes a laser light source that emits the laser light, a laser light source that emits the laser light, and a support member that extends along the open surface of the front surface of the reflective surface and holds the phosphor. A lens for condensing the laser beam on the phosphor, the laser light source emits a laser beam having a cross-sectional shape with a longitudinal direction and a short direction, and the lens is an aspherical lens. The support member has a width in which the phosphor can be accommodated, and extends in the longitudinal direction of the cross-sectional shape of the laser beam in the phosphor. .

  The present invention provides the illumination device, wherein the reflecting surface has a focal point, the phosphor is disposed at a focal point of the reflecting surface, and the laser beam is emitted at 10 to 60 degrees with respect to the optical axis of the reflecting surface. The phosphor is irradiated at an incident angle of degrees.

  The present invention is characterized in that, in the illuminating device, the laser light emitting means is arranged such that the other laser light emitting means is not located at an opposing position across the optical axis of the reflecting surface.

  According to the present invention, in the illumination device, the hole is formed in an annular slit shape in the reflection surface, and a bottom portion of the reflection surface can be separated by the hole in the ring slit shape. The bottom part is connected to a moving means that moves in a direction away from the focal point along the optical axis.

  The present invention is characterized in that the phosphor is irradiated with the laser beam at an incident angle of 30 degrees to 60 degrees with respect to the optical axis of the reflecting surface in the illumination device.

  The present invention is characterized in that, in the illumination device, the phosphor and the laser beam emitting means move relative to the reflecting surface along the optical axis of the reflecting surface.

  The present invention is characterized in that, in the illumination device, the hole is a slit extending in a radial direction of the reflection surface as viewed from the optical axis.

  The present invention provides the illumination device, wherein the reflection surface includes a bottom-side reflection region and an open-end-side reflection region obtained by dividing the same paraboloid into a bottom portion side and an open end side. The phosphor is disposed at the focal point of the surface, and the open end side reflection region is shifted in the optical axis direction with respect to the bottom side reflection region so as to spread the reflected light reflected by the fluorescence of the phosphor. It is characterized by being arranged in.

  The present invention is characterized in that, in the illumination device, the phosphor is held on a plane reflecting surface.

  The present invention is characterized in that the illumination device includes a support member having a high thermal conductivity that extends along an open surface of the front surface of the reflection surface and holds the phosphor.

  The present invention is characterized in that, in the above-described lighting device, a high thermal conductivity supporting member is provided that extends from the bottom side toward the open surface of the front surface of the reflecting surface in the reflecting surface and holds the phosphor. To do.

  The present invention provides the illumination device, wherein the laser light emitting means includes a laser light source that emits the laser light, and a lens that condenses the laser light emitted from the laser light source on the phosphor, The laser light source emits a laser beam having a light beam cross-sectional shape having a longitudinal direction and a transverse direction, the lens is an aspheric lens, the support member has a width in which the phosphor can be accommodated, and The phosphor extends in the longitudinal direction of the beam cross-sectional shape of the laser light in the phosphor.

  The present invention is characterized in that, in the illuminating device, each of the plurality of laser beam emitting means is arranged in a posture in which the longitudinal directions of the laser beams emitted from the laser light source are aligned in the same direction.

  According to the present invention, in the illumination device, each of the laser beam emitting means is disposed on the same side perpendicular to the optical axis of the reflection surface, as viewed from the phosphor, and on the same surface perpendicular to the optical axis of the reflection surface. The phosphor is irradiated with laser light through a hole penetrating the front and back of the mirror, and the hole provided for each of the laser light emitting means extends in the longitudinal direction of the cross-sectional shape of the light beam passing through the laser. It is characterized by being formed in a rectangular shape with a size that does not block light.

  The present invention is characterized in that, in the illumination device, the phosphor is a YAG-Ce single crystal.

  According to the present invention, in the illumination device, the laser light emitted from the laser light emitting means has a light beam cross-sectional shape having a short direction, and each of the laser light emitting means is oblique to the irradiated portion of the phosphor. The light beam cross-sectional shape is arranged so as to extend in the lateral direction by projection.

  According to the present invention, it is possible to suppress an error in control by the optical member.

It is a perspective view which shows the structure of the light projector which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of a light projector, (A) is a front view, (B) is a rear view, (C) is a side view, (D) is a bottom view. FIG. 3 is a cross-sectional view taken along line III-III in FIG. It is a figure which shows the light projection apparatus of the state which excluded the reflecting mirror unit in FIG. It is a layout diagram of a reflecting mirror unit, a laser light source, and a fluorescent member. It is a figure for demonstrating the relationship between the light beam cross-sectional shape of the laser beam of a laser light source unit, and an irradiation spot shape. It is a figure which shows the beam angle characteristic of a light projector. It is a perspective view which shows the structure of the light projection apparatus which concerns on 2nd Embodiment of this invention. It is the perspective view which notched a part of reflective surface of the light projector. It is a layout diagram of a reflecting mirror unit, a laser light source unit, and a fluorescent member. It is a rear view which shows the structure of the reflective mirror unit which concerns on 3rd Embodiment of this invention with a laser light source unit. FIG. 12 is a sectional view taken along line XII-XII in FIG. 11. It is a figure which shows the result of having carried out the simulation analysis of the illumination distribution in the location several meters away from the light projector, (A) shows the illumination distribution by reflection of a bottom part side reflection area, (B) is an open end side reflection area. The illuminance distribution by reflection is shown, and (C) shows the illuminance distribution by reflection of the reflecting surface. Moreover, (D) shows the illuminance distribution by reflection of the reflective surface where the open end side reflection region is not offset. It is a figure which shows chromaticity distribution of a to-be-irradiated surface, (A) shows the color distribution of the light projector of this embodiment, (B) is a color when the open end side reflection area is not offset in a reflective surface. Show the distribution. It is a perspective view which shows the structure of the light projector which concerns on 4th Embodiment of this invention. It is a figure which shows roughly the change of the light beam cross-sectional shape of the laser beam between a laser light source and fluorescent substance, (A) is the figure which looked at the vertical cross section C1 from the advancing direction of the laser beam. It is a figure which shows the structure of a reflective surface typically. It is a figure which shows a fluorescent substance typically with a support bar. It is a figure which shows the structure of the light projection apparatus which concerns on the 1st modification of this invention. It is a layout diagram of a reflecting mirror unit, a laser light source, and a fluorescent member of a light projecting device according to a second modification of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, a light projector is illustrated as an aspect of the illumination device.

[First Embodiment]
FIG. 1 is a perspective view showing a configuration of a light projecting device 1 according to the present embodiment. 2A and 2B are diagrams illustrating a configuration of the light projecting device 1. FIG. 2A is a front view, FIG. 2B is a rear view, FIG. 2C is a side view, and FIG. 2D is a bottom view. It is.
The light projecting device 1 is an illumination device that projects and illuminates illumination light by applying illumination light to an irradiation target, and includes a device main body 2 and a mounting arm 4 that supports the device main body 2.
The apparatus main body 2 includes a substantially cylindrical casing 6 having an emission port 6A opened to the front (front surface), and a front cover 8 that covers the emission port 6A. In the present embodiment, the housing 6 is formed by die casting using, for example, aluminum having a high thermal conductivity. As shown in FIG. 2C, the back surface portion 6B of the housing 6 bulges toward the back, and a number of air holes 9 are formed on the surface thereof.
The attachment arm 4 is attached to the installation location of the light projecting device 1 and supports the device main body 2 so as to be tiltable, so that the attachment angle of the light projecting device 1 can be changed.

3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a diagram illustrating the light projecting device 1 in a state where the reflecting mirror unit 10 is removed from FIG.
As shown in FIGS. 3 and 4, the light projecting apparatus 1 includes a reflecting mirror unit 10, a plurality of laser light source units 12, and a fluorescent member 14 provided in the apparatus main body 2.
The reflecting mirror unit 10 is a reflective optical member having a concave reflecting surface 10A. In the present embodiment, the reflecting surface 10A is a parabolic surface optically designed with reference to the focal point f, and reflects light emitted from the focal point f in parallel to the optical axis K of the reflecting surface 10A. The reflector unit 10 of the present embodiment is configured such that the bottom side can be separated, which will be described later.

Each of the laser light source units 12 is laser light emitting means for emitting laser light R (FIG. 5), and includes a laser light source 17, a lens 18, and a heat radiating member 19.
The laser light source 17 is a member that emits laser light R, and a semiconductor laser (so-called laser diode (LD)) that outputs blue laser light R is used as the laser light source 17 of the present embodiment.
The lens 18 is an optical element that controls the laser light R of the laser light source 17. The lens 18 of the present embodiment condenses the laser light R at the focal point f of the reflecting surface 10A.
The heat dissipating member 19 is a heat sink member that dissipates heat from the laser light source 17 and includes a large number of heat dissipating fins.
As shown in FIG. 4, these laser light source units 12 are arranged with the heat radiation member 19 facing the ventilation hole 9 of the housing 6 so that the laser light source 17 is efficiently cooled.
A fiber laser may be used for each of the laser light sources 17. In addition, each of the laser light sources 17 may use an emission end of each branch path of an optical branch circuit that branches the laser light of one laser light source into a plurality of parts.

As shown in FIG. 5, the fluorescent member 14 includes a phosphor 20 that emits fluorescence when excited by excitation light, and a fluorescence holding unit 22 that holds the phosphor 20. It is arranged at the focal point f.
For the phosphor 20 of the present embodiment, a YAG-Ce single crystal is used. The YAG-Ce single crystal is a YAG (Y ₃ Al ₅ O ₁₂ ) single crystal to which Ce is added, and is a phosphor that emits yellow fluorescence when excited by blue excitation light. The YAG-Ce single crystal has a characteristic that a change in the amount of fluorescent light with respect to a temperature change (particularly, a decrease in the amount of fluorescent light accompanying a rise in temperature) is small. Therefore, even when the temperature of the phosphor 20 is increased by irradiation with a plurality of laser beams R, a sufficient amount of fluorescent light for illumination is maintained.

  The fluorescence holding unit 22 has a thin cylindrical shape and is held by the fluorescence holding unit 22. The fluorescent holding unit 22 is supported by a thin bar-like support bar 26 (FIG. 4) extending along the open surface 10B of the reflecting mirror unit 10 (reflecting surface 10A). The support bar 26 is formed of a high thermal conductivity material (in this embodiment, an aluminum material), and an end portion 26 </ b> A of the support bar 26 is provided on a support member mounting portion 28 provided on the open edge portion 10 </ b> C of the reflector unit 10. Is retained. Similarly to the support bar 26, the support member mounting portion 28 is also formed of a high thermal conductivity material (in this embodiment, an aluminum material).

  The fluorescence holding unit 22 has a planar reflection surface 22A that is a planar reflection surface, and the phosphor 20 is held on the planar reflection surface 22A. When the phosphor 20 is irradiated with the laser light R as excitation light, the laser light R transmitted through the phosphor 20 is reflected by the planar reflecting surface 22A on the side of the reflecting surface 10A at the laser irradiation point E (FIG. 6) of the phosphor 20. Is reflected. As a result, the mixed light of the laser beam R and the fluorescence reflected by the planar reflecting surface 22A on the side of the reflecting surface 10A is emitted from the laser irradiation point E. In this embodiment, since the laser beam R is blue and the fluorescence is yellow, the mixed light is white light. Further, in this fluorescent member 14, the light distribution of the white light emitted from the laser irradiation point E is generally a Lambertian light distribution regardless of the incident angle α (FIG. 5) of the laser light to the phosphor 20.

As shown in FIG. 4, the arrangement of the laser light source unit 12 as viewed from the direction of the optical axis K is such that, for any of the laser light source units 12, another laser is located at the opposite position M across the optical axis K of the reflecting surface 10 </ b> A. The light source unit 12 is not located.
With this arrangement, any of the laser light source units 12 is not irradiated by the laser light R that is regularly reflected by the planar reflecting surface 22A of the fluorescent member 14 toward the reflecting surface 10A.

  FIG. 5 is a layout diagram of the reflecting mirror unit 10, the laser light source unit 12, and the fluorescent member 14. In the figure, the heat radiation member 19 provided in the laser light source unit 12 is omitted.

  As shown in the figure, the reflecting mirror unit 10 is formed in a cup shape (concave shape) in which the reflecting surface 10A is provided on the inner side, and each of the laser light source units 12 reflects from the fluorescent member 14. It is arranged at a position on the back side of the surface 10A (a position hidden behind the reflecting surface 10A). As shown in FIGS. 1 and 5, a hole 16 penetrating the front and back is formed in the reflecting surface 10 </ b> A of the reflecting mirror unit 10. The hole portion 16 is a light transmission portion that transmits the laser light R emitted from the laser light source unit 12 toward the focal point f. In the present embodiment, the hole 16 is formed in an annular slit shape with the optical axis K as the center, as shown in FIGS. 1 and 2A. The reflector unit 10 of the present embodiment is divided so as to be separable by the annular slit-shaped hole 16.

  As described above, the phosphor 20 of the fluorescent member 14 is disposed at the focal point f, and each laser light source unit 12 irradiates the focal point f with the laser light R. Thereby, white light emission of Lambert light distribution occurs at the laser irradiation point E of the phosphor 20, that is, at the focal point f. The white light generated at the focal point f enters the reflecting surface 10A and is controlled by the reflecting surface 10A to become parallel light substantially parallel to the optical axis K, and this parallel light is emitted as illumination light.

  In general, the closer the light emission at the focal point f is to the point light source, the higher the parallelism of the illumination light, and the spread of the illumination light in the distance, for example, 100 meters or more away, can be suppressed. It becomes possible to illuminate. Therefore, in the present embodiment, the light emission at the focal point f is brought close to the point light source in the following manner to suppress the spread in the distance.

  That is, each of the laser light source units 12 is provided with the lens 18 as described above. The lens 18 is a condensing lens that condenses the laser light R at the focal point f. In the lens 18 of the present embodiment, the irradiation spot diameter at the focal point f is set to a size that can be regarded as a point light source in the optical design, and light emission at the focal point f can be regarded as a point light source in the optical design.

Further, as shown in FIG. 5, each of the laser light source units 12 is arranged on the same plane Q perpendicular to the optical axis K of the reflecting surface 10A. According to this arrangement, the laser light source units 12 are arranged at the same distance and the same angle from the focal point f.
Thereby, the dispersion | variation in each irradiation spot shape G (FIG. 6) of the laser light source unit 12 in the focus f is suppressed. At the focal point f, since the laser beam R overlaps with the irradiation spot shape G having the substantially same shape and the irradiation spot diameter, blurring of the irradiation spot shape G formed by overlapping these is suppressed. The diameter never expands. That is, even if the laser beams of the plurality of laser light source units 12 are irradiated to the focal point f, the spread of the irradiation spot diameter at the focal point f can be suppressed, so that the emission size at the focal point f is irradiated with one laser beam R. The size of the emitted light can be suppressed to the same level. As a result, the size of light emission at the focal point f is maintained at a level that can be regarded as a point light source.
Further, according to the arrangement of the laser light source unit 12 of the present embodiment, since the same lens is used for each of the lenses 18, the cost can be reduced.

Here, the laser beam R is incident on the fluorescent member 14 disposed at the focal point f of the reflective surface 10A at a predetermined incident angle α with respect to the optical axis K. As the incident angle α approaches zero degrees, the laser light source units 12 are arranged so as to be gathered on the optical axis K. When the incident angle α is 10 degrees or less, these arrangements become difficult. On the other hand, as the incident angle α increases, the irradiation spot shape G at the laser irradiation point E extends, so that the size of the light emission increases. When the incident angle α is 60 degrees or more, the light emission size becomes a point light source in the optical design. It will exceed the size that can be considered.
Therefore, in the light projecting device 1, the laser beam R is irradiated on the fluorescent member 14 at an incident angle α (in the present embodiment, an incident angle α = 45 degrees) in the range of 10 degrees to 60 degrees.

FIG. 6 is a view for explaining the relationship between the beam cross-sectional shape T of the laser light R of the laser light source unit 12 and the irradiation spot shape G.
The laser light R emitted from the laser light source unit 12 of the present embodiment has a light beam cross-sectional shape T that is not a perfect circle, and has a shape having a short direction D1 as shown in FIG. The light beam cross-sectional shape T is the beam shape of the laser light R in the vertical cross-section C1 perpendicular to the traveling direction of the laser light R.
On the other hand, when the laser beam R is incident on the phosphor 20 obliquely at an incident angle α, the light beam cross-sectional shape T is obliquely projected at the laser irradiation point E. Therefore, the irradiation spot shape G indicates the traveling direction of the laser beam R From the viewpoint, the light beam cross-sectional shape T is deformed so as to extend in the direction H in which the optical axis K is located. At this time, if the light beam cross-sectional shape T extends in the short direction D1, the length of the irradiation spot shape G in the short direction is longer than the case where the light beam cross-sectional shape T extends in the other direction (particularly, the longitudinal direction D2 of the light beam cross-sectional shape T). Since it approaches the length in the longitudinal direction, the irradiation spot diameter when condensed by the lens 18 can be reduced.
Therefore, in the present embodiment, each of the laser light source units 12 is arranged in such a posture that the light beam cross-sectional shape T of the laser light R is deformed in the short direction D1 by oblique projection onto the irradiation site of the phosphor 20.

As described above, the reflecting mirror unit 10 according to the present embodiment is divided by the annular slit-shaped hole 16 so that the bottom is separable. Specifically, as shown in FIG. 3, the reflecting mirror unit 10 is divided into a bottom side unit 52 on the bottom side and an upper side unit 54 including an open edge portion 10C. Behind the bottom unit 52 is connected an operation bar 56 that can be pulled out in parallel with the optical axis K.
By pulling out the operation bar 56 to the rear side, the bottom unit 52 moves along the optical axis K in the direction away from the back surface 6B of the apparatus body 2, that is, the focal point f. When the bottom unit 52 moves away from the focal point f, the light reflected by the reflecting surface 10A of the bottom unit 52 becomes non-parallel light, and the light distribution of the illumination light is varied.

  In this embodiment, since the reflective surface 10A is a parabolic surface, the light reflected by the reflective surface 10A of the bottom side unit 52 increases with respect to the optical axis K as the movement amount to the back side of the bottom side unit 52 increases. The light spreads with a large beam angle. As a result, the beam angle of the illumination light can be varied from a substantially parallel light to a predetermined angle.

FIG. 7 is a diagram illustrating a beam angle characteristic of the light projecting device 1 as a light distribution characteristic of the light projecting device 1. In the figure, the 1/2 illumination angle and the 1/10 illumination angle of the light projecting device 1 are used as the beak angle characteristics.
As shown in the figure, in the light projecting device 1 of the present embodiment, when the movement amount of the bottom side unit 52 of the reflecting mirror unit 10 is zero (mm), the ½ illuminance angle is 1.0 (degrees). Yes, illumination light close to substantially parallel light is obtained. As the amount of movement of the bottom side unit 52 to the rear side increases, the ½ illuminance angle and 1/10 illuminance angle also increase. When the amount of movement is 5 (mm), the ½ illuminance angle is 14. It can be expanded to 5 degrees.

By the way, the lower the proportion of the bottom side unit 52 occupying the reflecting surface 10A of the reflecting mirror unit 10, that is, the farther the formation position of the annular slit-shaped hole portion 16 is away from the focal point f on the reflecting surface 10A, The amount of light that is changed by the movement of the side unit 52 is reduced. When the angle of the hole 16 with respect to the optical axis K (that is, the incident angle α) is less than 30 degrees when viewed from the fluorescent member 14, the amount of light controlled by the bottom unit 52 is too small, and sufficient illumination light is transmitted. Change in light distribution cannot be obtained.
On the other hand, when the angle of the hole 16 with respect to the optical axis K (ie, the incident angle α) is 60 degrees or more when viewed from the fluorescent member 14, the irradiation spot diameter on the fluorescent member 14 becomes large, and light emission cannot be regarded as a point light source.
Therefore, in the light projecting device 1, the incident angle α of the laser light R is set to a range of 30 degrees to 60 degrees, which is narrower than the above-described 10 degrees to 60 degrees (in the present embodiment, the above-described range). And incident angle α = 45 degrees).

  As described above, according to the present embodiment, the following effects can be obtained.

In the light projecting device 1 of this embodiment, each of the laser light source units 12 is disposed at the same angle and the same distance as viewed from the phosphor 20.
Thereby, blurring of the irradiation spot shape G due to the overlap of the plurality of laser beams R is suppressed, and the irradiation spot diameter does not expand. Therefore, since the size of the light emitted from the phosphor 20 is maintained at a size that can be regarded as a point light source in the optical design, errors that occur in the control on the reflecting surface 10A can be suppressed. Further, since the phosphor 20 is irradiated with the laser light R from a plurality of directions and overlapped, unevenness in illumination intensity of the illumination light can be suppressed. Furthermore, since the same lens is used for each of the lenses 18, the cost can be reduced.

In the light projecting device 1 of the present embodiment, each of the laser light source units 12 is disposed on the same surface Q that is on the back side of the reflecting surface 10A when viewed from the phosphor 20 and is perpendicular to the optical axis K of the reflecting surface 10A. It was set as the structure which irradiates the laser beam R to the fluorescent substance 20 through the hole part 16 which penetrated the reflector unit 10 in the front and back.
According to this configuration, since the arrangement of the plurality of laser light source units 12 is arranged on the back side of the reflecting surface 10A, the light projecting device 1 can be made compact.

In the light projecting device 1 of the present embodiment, the phosphor 20 is irradiated with the laser beam R at an incident angle α of 10 degrees to 60 degrees with respect to the optical axis K of the reflecting surface 10A.
According to this configuration, the laser light source unit 12 can be disposed around the optical axis K, and the size of the light emitted from the phosphor 20 can be suppressed to a size that can be regarded as a point light source in optical design.

In the light projecting device 1 of the present embodiment, the laser light source unit 12 is arranged such that no other laser light source unit 12 is positioned at an opposing position across the optical axis K of the reflecting surface 10A.
With this arrangement, any of the laser light source units 12 is not irradiated by the laser light R that is regularly reflected by the planar reflecting surface 22A of the fluorescent member 14 toward the reflecting surface 10A.

In the light projecting device 1 of the present embodiment, the bottom side unit 52 on the bottom side of the reflective surface 10A is separable, and the operation bar 56 that moves in the direction away from the focal point f along the optical axis K of the reflective surface 10A is provided at the bottom. It is connected to the side unit 52.
Thereby, the beam angle of the illumination light of the light projector 1 can be varied.
Moreover, in the light projector 1 of this embodiment, the hole 16 is formed in an annular slit shape, and the bottom side unit 52 is separated by the annular slit-shaped hole. Thereby, since the slit for separating the bottom side unit 52 is also used as the hole 16, there is no need to open the hole 16 in the bottom side unit 52, and the area of the reflection surface 10 </ b> A of the bottom side unit 52 is increased. It will not be reduced by the holes 16.

In the light projecting device 1 of the present embodiment, the phosphor 20 is irradiated with the laser beam R at an incident angle α of 30 degrees to 60 degrees with respect to the optical axis K of the reflecting surface 10A.
According to this configuration, the light emitted from the fluorescent member 14 can be maintained at a size that can be regarded as a point light source in the optical design while realizing a sufficient light distribution change of the illumination light by the movement of the bottom side unit 52.

In the light projecting device 1 of the present embodiment, the phosphor 20 is held on the planar reflecting surface 22A.
Thereby, since the light which mixed laser beam R and fluorescence can be utilized for illumination light, the color of illumination light can be changed arbitrarily by selecting laser beam R and fluorescent substance 20 suitably.

In the light projecting device 1 of the present embodiment, each of the laser light source units 12 is in a posture in which the short direction D1 of the light beam cross-sectional shape T is extended by oblique projection onto the laser irradiation point E (that is, the focal point f) of the phosphor 20. Has been placed.
Thereby, since the length in the short direction of the irradiation spot shape G is brought close to the length in the longitudinal direction, the irradiation spot diameter when condensed by the lens 18 can be reduced.

[Second Embodiment]
FIG. 8 is a perspective view showing a configuration of a light projecting device 100 according to the second embodiment of the present invention. FIG. 9 is a perspective view in which a part of the reflecting surface 10A of the light projecting device 100 is cut away. In these drawings, the members described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the light projecting device 100 according to the present embodiment, the light distribution of illumination light is varied by moving the set of the fluorescent member 14 and the laser light source unit 12 relative to the reflecting mirror unit 110.

  More specifically, as shown in FIG. 8, the apparatus main body 106 of the light projecting device 100 is provided with a reflecting mirror unit 110 having a reflecting surface 10A, and the reflecting mirror unit 110 is the first embodiment. Unlike the reflecting mirror unit 10, the reflecting mirror unit 10 is not divided and is fixed to the housing 6 in a stationary state.

FIG. 10 is a layout diagram of the reflecting mirror unit 110, the laser light source unit 12, and the fluorescent member 14.
As shown in FIGS. 9 and 10, each of the laser light source units 12 is disposed on the back side of the reflecting surface 10A. Specifically, an attachment portion 170 to which the laser light source unit 12 is attached is provided on the back side of the reflecting mirror unit 110.
The mounting portion 170 is provided with a through shaft portion 172 that extends coaxially with the optical axis K of the reflective surface 10A and penetrates the bottom of the reflective surface 10A front and back. A plurality of support rods 174 extending toward the open surface 10B on the front surface of the reflective surface 10A are provided at the tip of the penetrating shaft portion 172, and these support rods 174 serve as a focal point f of the reflective surface 10A. I support it. The through-shaft portion 172 and the support rod 174 are formed of, for example, an aluminum material that is a high thermal conductivity material.

  An operation bar 156 that is movable in parallel with the optical axis K is connected to the back of the mounting portion 170. As the operation bar 156 moves, the laser light source unit 12 and the fluorescent member 14 move relative to the reflecting surface 10A together with the mounting portion 170. In the reflecting surface 10A, a hole 116 through which the laser light R of the laser light source unit 12 passes is formed in a slit shape extending in the radial direction of the reflecting surface 10A when viewed from the optical axis K. Thereby, even if the laser light source unit 12 moves along with the movement of the operation bar 156, the laser light is irradiated to the fluorescent member 14 through the hole 116 without being blocked by the reflecting surface 10A.

  Further, with the movement of the operation bar 156, the distance between the fluorescent member 14 and the reflecting surface 10A is varied, and the light distribution of the illumination light is also varied as in the first embodiment.

  According to the light projecting device 100 of the present embodiment, the following effects can be obtained.

That is, in the light projecting device 100 of the present embodiment, the phosphor 20 and the laser light source unit 12 move relative to the reflecting surface 10A along the optical axis K of the reflecting surface 10A.
Thereby, the light distribution of illumination light can be varied. Moreover, since the relative positional relationship between the phosphor 20 and the laser light source unit 12 does not change, the irradiation spot shape G and the irradiation spot diameter do not change.

  Further, in the light projecting device 100 of this embodiment, the hole 116 is a slit extending in the radial direction of the reflecting surface 10A when viewed from the optical axis K. Therefore, even when the laser light source unit 12 moves along the optical axis K, The laser beam R is not blocked by the reflecting surface 10A.

[Third Embodiment]
In the present embodiment, a light projecting device in which the configurations of the reflecting mirror units 10 and 110 in the light projecting devices 1 and 100 of the first embodiment or the second embodiment are different will be described.
FIG. 11 is a rear view showing the configuration of the reflecting mirror unit 410 according to this embodiment together with the laser light source unit 12, and FIG. 12 is a sectional view taken along line XII-XII in FIG. In FIG. 11, a set of laser light source units 12 and holes 416 are shown in order to facilitate understanding of the configuration, but actually, the second embodiment is included in the light projecting device of this embodiment. Similar to the embodiment, a plurality of sets of laser light source units 12 and holes 416 are provided. 11 and 12, the members already described in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 11 and 12, the reflecting surface 410A of the reflecting mirror unit 410 has a concave shape, and, similar to the first embodiment and the second embodiment, the laser light source unit 12 on the back surface side of the reflecting surface 410A. Is arranged, the phosphor 20 is arranged on the front side, and a hole 416 through which the laser light R of the laser light source unit 12 passes is formed in the reflective surface 410A.

As shown in FIG. 12, the reflective surface 410A includes a bottom-side reflective region 411A disposed on the concave bottom side and an open-end side reflective region disposed on the concave open edge 410C (open end) side. It has two reflective areas with 411B.
Both the bottom side reflection region 411A and the open end side reflection region 411B are paraboloids having the same focal point f and curvature. In other words, the same paraboloid is placed on the bottom side and the open end side. It corresponds to what was divided into two.
In the reflection surface 410A, the phosphor 20 is disposed at the focal point f of the bottom side reflection region 411A, while the open-end reflection region 411B has a distance δ in the direction of the optical axis K toward the focal point f. It is arranged at a position offset (shifted) from the bottom side reflection region 411A.

  FIG. 13 is a diagram showing the result of simulation analysis of the illuminance distribution at a location several meters away from the light projecting device of the present embodiment, and FIG. FIG. 13B shows the illuminance distribution due to the reflection of the open end side reflection region 411B, and FIG. 13C shows the illuminance distribution due to the reflection of the reflective surface 410A. FIG. 13D is a diagram showing an illuminance distribution due to reflection of the reflection surface (that is, the reflection surface 10A of the first embodiment and the second embodiment) where the open end side reflection region 411B is not offset. Each illuminance distribution is shown as a relative value based on the maximum illuminance in the distribution.

  In the reflective surface 410A of the present embodiment, since the phosphor 20 is disposed at the focal point f of the bottom side reflection region 411A, as shown in FIG. 12, the reflected light L1 of the bottom side reflection region 411A is substantially parallel light. Become. For this reason, as shown in FIG. 13A, the illuminance distribution of the reflected light L1 of the bottom side reflection region 411A is a distribution in which the central portion G1 centering on the optical axis K is high (that is, the luminance distribution of the phosphor 20 is Projected distribution).

  On the other hand, since the open end side reflection region 411B is arranged slightly shifted from the focal point f, the reflected light L2 of the open end side reflection region 411B is at a predetermined angle θ with respect to the optical axis K as shown in FIG. Expand with. For this reason, as shown in FIG. 13B, the illuminance distribution of the reflected light L2 of the open end side reflection region 411B is an annular outer peripheral portion surrounding the central portion G1 rather than the central portion G1 centering on the optical axis K. The distribution becomes higher at G2.

Therefore, as shown in FIG. 13C, the illuminance distribution due to the reflection of the reflective surface 410A is a distribution in which the illuminance is substantially uniform (so-called flat top) over a wide range from the central portion G1 to the peripheral portion G2.
On the other hand, when the open end side reflection region 411B is not offset, all of the reflected light on the reflecting surface becomes parallel light. Therefore, as shown in FIG. According to the illuminance distribution, the illuminance is concentrated in a narrower range G3 than the central portion G1.

FIG. 14 is a diagram showing the chromaticity distribution of the irradiated surface, FIG. 14A shows the color distribution of the light projecting device of this embodiment, and FIG. 14B shows the open end side reflection region on the reflection surface 410A. The color distribution when 411B is not offset is shown. These were measured with a color luminance meter.
In the light projecting device, the laser light R is incident on the phosphor 20 to obtain white light. However, color unevenness may occur in the white light due to the influence of the particle size of the phosphor 20, and in this case, As shown in FIG. 14B, the color unevenness of the white light is also projected on the irradiated surface.
On the other hand, in the reflective surface 410A of the present embodiment, the irradiated surface is illuminated by the mixed light of the reflected light L1 of the bottom side reflective region 411A and the reflected light L2 of the open end side reflective region 411B. As shown in A), the color unevenness is canceled out.

Thus, according to the present embodiment, the reflective surface 410A has the bottom side reflection region 411A and the open end side reflection region 411B, which are formed by dividing the same paraboloid into the bottom side and the open end side, The open end side reflection region 411B is arranged at a position offset (shifted) in the direction of the optical axis K with respect to the bottom side reflection region 411A so that the reflected light L2 spreads.
Thereby, a flat top illuminance distribution can be obtained, a wide range can be illuminated with a uniform illuminance, and color unevenness of the irradiated surface can also be suppressed. Thereby, high-quality illumination can be realized.

[Fourth Embodiment]
FIG. 15 is a perspective view illustrating a configuration of a light projecting device 500 according to the present embodiment. In addition, in the same figure, about the member demonstrated in either of 1st-3rd embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in the figure, the light projecting device 500 includes a single support bar 526, whereas the light projecting device 1 of the first embodiment includes a plurality of support bars 26. The support bar 526 is formed of a high thermal conductivity material, and is formed in an elongated plate shape wider than the support bar 26 of the first embodiment. A pair of support member mounting portions 528 are provided on the open edge portion 10 </ b> C of the reflective surface 10 </ b> A, and both end portions 526 </ b> A of the support bar 526 are fixed to the support member mounting portions 528.

FIG. 16 is a diagram schematically showing a change in the beam cross-sectional shape T of the laser light R between the laser light source 17 and the phosphor 20. In FIG. 16A, FIG. 16A is a view of the vertical cross section C1 viewed from the traveling direction of the laser light R.
As shown in FIGS. 6 and 16 above, the light beam cross-sectional shape T of the laser light R is a shape having a longitudinal direction D2 and a short direction D1 (substantially rectangular, (Alternately oval).

  More specifically, in the present embodiment, the laser diode that is the laser light source 17 has a laser light emission surface formed in a substantially rectangular shape. For this reason, as shown in FIG. 16, in the vertical cross section C2 immediately after being emitted from the emission surface, the shape of the emission surface is reflected in the light beam cross sectional shape T of the laser light R, and the light beam cross sectional shape T is the longitudinal direction Db. And it becomes the shape which has the transversal direction Da. Further, as described above, the laser light source unit 12 includes the lens 18, and the laser light R from the laser light source 17 is condensed on the phosphor 20 by the lens 18. In FIG. 16, the light beam cross-sectional shape T of the vertical cross section C <b> 3 indicates the cross-sectional shape of the laser light R immediately after being emitted from the lens 18.

Here, an aspherical lens is used as the lens 18, and the light beam cross-sectional shape T of the laser light R has a longitudinal direction Db and a lateral direction Da, and the longitudinal direction Db and the lateral direction of the laser light R. The direction Da has a different divergence angle, and the divergence angle in the short direction Da is larger than the divergence angle in the longitudinal direction Db, so that astigmatism occurs. In the present embodiment, since the focal point f of the lens 18 is set in accordance with the longitudinal direction Db of the laser light R, the focal point f is shifted with respect to the light component Ra in the short direction Da, and is closer to the phosphor 20. The light component Ra is focused at the position P.
For this reason, the longitudinal direction Db and the lateral direction Da of the laser light R are reversed in the vertical section C1 immediately before the phosphor 20, the longitudinal direction Db becomes the lateral direction D1, and the lateral direction Da becomes the longitudinal direction D2. .

In the present embodiment, as shown in FIG. 16A, the focal length of the lens 18 or the distance between the laser light source 17 and the lens 18 is determined by the longitudinal direction Db of the laser light R immediately after being emitted from the laser light source 17. Is set to be smaller than the diameter N of the phosphor 20 in the phosphor 20. In this case, depending on the size of the diameter N of the phosphor 20, the length ΔDa in the short direction Da of the laser light R immediately after being emitted from the laser light source 17 is larger than the diameter N of the phosphor 20 in the phosphor 20. If no measures are taken, a part of the laser light component R1 (FIG. 16A) of the laser light R is not directly contained in the phosphor 20, but is emitted directly to the outside. There's a problem.
Therefore, in the light projecting device 500 of the present embodiment, the support bar 526 that supports the phosphor 20 shields the laser light component R1 that does not fit in the phosphor 20, and the configuration will be described in detail below.

FIG. 17 is a diagram schematically showing the configuration of the reflective surface 10A, and FIG. 18 is a diagram schematically showing the phosphor 20 together with the support bar 526. As shown in FIG.
In the present embodiment, the reflective surface 10A is arranged with the reflective surface 10A on the lens 18 side from the position P where the short direction Da of the laser light R is focused, and the back surface is in the hole 516 of the reflective surface 10A. The light beam cross-sectional shape T of the laser light R incident from is similar to the light beam cross-sectional shape T in the vertical cross section C3, and has a longitudinal direction Db and a short direction Da. Then, as shown in FIG. 17, each of the plurality of laser light source units 12 is arranged in a posture in which the longitudinal direction Db of the laser light R when passing through the hole 516 is aligned in the same direction. As a result, FIG. As shown in FIG. 6, in the phosphor 20, the longitudinal direction D2 of each laser beam R is aligned in the same direction F.

On the other hand, the support bar 526 has a width W in which at least the diameter N of the phosphor 20 is accommodated, and extends in the direction F in which the longitudinal direction D2 of the laser light R extends in the phosphor 20.
As a result, in all the laser beams R, the laser beam component R1 that does not fit within the diameter N of the phosphor 20 is shielded by the support bar 526, so that the laser beam component R1 is not emitted to the irradiated surface. A bright spot due to the laser beam component R1 does not occur on the irradiated surface.

  In the present embodiment, as shown in FIG. 17, the hole 516 of the reflecting surface 10A has a rectangular shape (rounded rectangle in the illustrated example) that is long in the longitudinal direction Db of the laser light R passing therethrough, It is formed by an opening that is slightly larger than the light beam cross-sectional shape T of the light R (that is, a size that does not shield the laser light R). Thereby, for example, the opening area of the hole 516 can be reduced as compared with the case where the shape of the hole 516 is a circle having a diameter matched to the length of the laser beam R in the longitudinal direction Db. The decrease can be suppressed, and the decrease in light utilization efficiency can be suppressed.

Thus, according to the present embodiment, the support bar 526 has a width W in which the phosphor 20 can be accommodated, and extends in the longitudinal direction D2 of the light beam cross-sectional shape T of the laser light R in the phosphor 20. It was set as the structure to do.
As a result, the laser beam component R1 that does not fit within the diameter N of the phosphor 20 is shielded by the support bar 526, so that the laser beam component R1 is not emitted to the irradiated surface, and the bright spot due to the laser beam component R1. Will not occur on the irradiated surface.

  In addition, according to the present embodiment, each of the plurality of laser light source units 12 is arranged in a posture in which the longitudinal direction Db of the laser light R emitted from the laser light source 17 is aligned in the same direction. Can be shielded by the same single support bar 526. Thereby, the number of the support bars 526 crossing the reflecting surface 10A is suppressed, and the shielding of the illumination light by the support bars 526 can be suppressed.

Further, in the present embodiment, the hole 516 provided for each laser light source unit 12 extends in the longitudinal direction Db of the light beam cross-sectional shape T of the laser light R passing therethrough and has a rectangular size that does not shield the laser light R. It is formed into a shape.
Thereby, a reduction in the reflection area of the reflection surface 10A is suppressed, and a decrease in light utilization efficiency is suppressed.

  Each embodiment described above is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.

  In the first embodiment described above, the fluorescent member 14 may be provided on the front cover 8.

  In the first to fourth embodiments described above, the configuration in which each of the laser light source units 12 includes the heat radiating member 19 is exemplified, but the present invention is not limited thereto. That is, the laser light source unit 112 may be provided in one heat radiating member 280 like the light projection apparatus 200 shown in FIG.

In the first to fourth embodiments described above, the case where each of the laser light source units 12 is arranged on the same plane Q perpendicular to the optical axis K of the reflecting surface 10A is exemplified. However, the laser light source unit 12 includes a plurality of laser light sources on each of a plurality of planes Q1, Q2,... Perpendicular to the optical axis K of the reflecting surface 10A as in the light projecting device 300 shown in FIG. Unit 12 may be arranged.
As a result, the output of the light projecting device 300 can be increased.

  Further, the present invention is not limited to the light projecting device, and can be applied to any lighting device.

1, 100, 200, 300, 500 Projecting device 8 Front cover 10, 110, 410 Reflector unit (optical member, reflector)
10A, 410A Reflective surface 411A Bottom side reflective region 411B Open end side reflective region 10B Open surface 12, 112 Laser light source unit (laser light emitting means)
DESCRIPTION OF SYMBOLS 14 Fluorescence member 16,116,416,516 Hole part 17 Laser light source 18 Lens 20 Fluorescent substance 22 Fluorescence holding | maintenance part 22A Planar reflective surface 26,526 Support bar (support member)
28 Support member mounting portion 52 Bottom side unit 56, 156 Operation bar (moving means)
110 Reflector (Optical member)
170 Mounting portion 172 Through shaft portion 174 Support rod (support member)
D1, Da Short direction D2, Db Longitudinal direction E Laser irradiation point G Irradiation spot shape K Optical axis M Opposite position Q, Q1, Q2 Plane R Laser light T Light beam cross-sectional shape f Focus α Incident angle

Claims (11)

Illumination comprising a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and that is illuminated by the fluorescence controlled by the optical member In the device
Each of the laser beam emitting means is arranged around the optical axis of the optical member at the same angle and the same incident angle with respect to the optical axis as seen from the phosphor arranged on the optical axis of the optical member. Has been
The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor.
Each of the laser beam emitting means,
The phosphor is irradiated with laser light through a hole portion that is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and perpendicular to the optical axis of the reflecting surface. ,
The hole is formed in an annular slit shape in the reflective surface, and the bottom of the reflective surface can be separated by the annular slit-shaped hole portion,
The bottom of the reflecting surface is connected to a moving means that moves in a direction away from the focal point of the reflecting surface along the optical axis.
A lighting device characterized by that. Illumination comprising a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and that is illuminated by the fluorescence controlled by the optical member In the device
Each of the laser beam emitting means is arranged around the optical axis of the optical member at the same angle and the same incident angle with respect to the optical axis as seen from the phosphor arranged on the optical axis of the optical member. Has been
The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor.
Each of the laser beam emitting means,
The phosphor is irradiated with laser light through a hole portion that is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and perpendicular to the optical axis of the reflecting surface. ,
The reflective surface has a focal point;
The phosphor is disposed at a focal point of the reflecting surface;
With respect to the optical axis of the reflecting surface, the laser light is irradiated to the phosphor at an incident angle of 10 degrees to 60 degrees,
The illuminating device , wherein the phosphor and the laser beam emitting means move relative to the reflecting surface along the optical axis of the reflecting surface . Illumination comprising a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and that is illuminated by the fluorescence controlled by the optical member In the device
Each of the laser beam emitting means is arranged around the optical axis of the optical member at the same angle and the same incident angle with respect to the optical axis as seen from the phosphor arranged on the optical axis of the optical member. Has been
The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor.
Each of the laser beam emitting means,
The phosphor is irradiated with laser light through a hole portion that is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and perpendicular to the optical axis of the reflecting surface. ,
The reflection surface has a bottom side reflection region and an open end side reflection region formed by dividing the same paraboloid into a bottom side and an open end side,
The phosphor is disposed at the focal point of the paraboloid,
The open end side reflection region is disposed at a position shifted in the optical axis direction with respect to the bottom side reflection region so as to spread the reflected light reflected from the fluorescence of the phosphor. . The extending along the open surface of the front of the reflecting surface comprises a high thermal conductivity of the support member that holds the phosphor, the illumination device according to claim 1, characterized in that. Illumination comprising a plurality of laser light emitting means for emitting laser light, a phosphor that emits fluorescence when excited by the laser light, and an optical member that controls the fluorescence, and that is illuminated by the fluorescence controlled by the optical member In the device
Each of the laser beam emitting means is arranged around the optical axis of the optical member at the same angle and the same incident angle with respect to the optical axis as seen from the phosphor arranged on the optical axis of the optical member. Has been
The optical member is a reflecting mirror having a concave reflecting surface that reflects the fluorescence of the phosphor.
Each of the laser beam emitting means,
The phosphor is irradiated with laser light through a hole portion that is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and perpendicular to the optical axis of the reflecting surface. ,
Extending along the open surface of the front surface of the reflective surface, comprising a high thermal conductivity support member for holding the phosphor,
The laser beam emitting means is
A laser light source for emitting the laser light;
A lens for condensing the laser light emitted from the laser light source on the phosphor,
The laser light source emits a laser beam having a light beam cross-sectional shape having a longitudinal direction and a short direction,
The lens is an aspheric lens;
The support member has a width that allows the phosphor to be accommodated, and extends in the longitudinal direction of the cross-sectional shape of the laser beam in the phosphor.
A lighting device characterized by that . The reflective surface has a focal point;
The phosphor is disposed at a focal point of the reflecting surface;
6. The illumination device according to claim 5 , wherein the phosphor is irradiated with the laser light at an incident angle of 10 degrees to 60 degrees with respect to the optical axis of the reflecting surface. The illuminating device according to claim 5 or 6 , wherein the laser light emitting means is arranged so that the other laser light emitting means is not located at an opposing position across the optical axis of the reflecting surface. . The lighting device according to claim 5 , wherein the phosphor is held on a plane reflecting surface. Each of the plurality of laser beam emitting means
The illuminating device according to any one of claims 5 to 8 , wherein the laser light emitted from the laser light source is arranged so that the longitudinal directions thereof are aligned in the same direction. Each of the laser beam emitting means,
The phosphor is irradiated with laser light through a hole portion that is disposed on the same surface perpendicular to the optical axis of the reflecting surface as viewed from the phosphor and perpendicular to the optical axis of the reflecting surface. ,
The hole provided for each laser beam emitting means extends in the longitudinal direction of the cross-sectional shape of the light beam passing through the laser beam, and is formed in a rectangular shape having a size that does not shield the laser beam. The illuminating device in any one of Claims 5-9 . The laser light emitted by the laser light emitting means has a light beam cross-sectional shape at the irradiation position of the phosphor has a short direction,
Each of the laser light emitting means is disposed in a posture in which the cross-sectional shape of the light beam extends in the short direction by oblique projection onto the irradiated portion of the phosphor.
The illumination device according to claim 1 , wherein