JP2012156182A - Light source device using fluorescent material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To irradiate a fluorescent material again with light which was not used for the excitation of a fluorescent material for the purpose of reuse.SOLUTION: A light source device includes: a blue light-emitting laser diode 11-B as an excitation light source; a fluorescent material 15-G of green light emission which emits light by receiving the radiation of blue light B emitted from the blue light-emitting laser diode 11-B; and a light tunnel 12 functioning as a re-irradiation system made to re-irradiate with the excitation light either transmitted or reflected without contributing to the excitation of the fluorescent material among the excitation light radiated on the fluorescent material of the green light emission as the excitation light of the same fluorescent material 15-G.

Description

  The present invention relates to a light source device that uses, as illumination light, light emitted from a fluorescent material by irradiating excitation light. For example, the present invention relates to a light source device useful for a projection display device.

  In Patent Document 1, as a light source for a single-plate projector device using a digital micromirror device (DMD) or the like as a spatial light modulator, an RGB fluorescent material excited by an ultraviolet wavelength laser light source is applied to each segment. There has been proposed a light source device for a projector constituted by a color wheel.

JP 2004-341105 A

  As described above, when the fluorescent material is caused to emit light using the light from the solid state light emitting element as excitation light, the efficiency with which the fluorescent material absorbs excitation light cannot be made 100%. That is, there is light that is not used for excitation of the fluorescent material among light from the solid state light emitting device. For this reason, there is a problem that the light utilization efficiency is low.

  In consideration of the above circumstances, the present invention is a light source using a fluorescent material that can increase the light utilization efficiency by irradiating the fluorescent material again with light that has not been used for excitation of the fluorescent material and reusing it. An object is to provide an apparatus.

  In order to solve the above-mentioned problems, the invention of claim 1 includes an excitation light source (11-B, 31-UV) and a fluorescent material (15-G, 35) that emits light upon irradiation with excitation light emitted from the excitation light source. -G, 45-G), and excitation light transmitted or reflected without contributing to excitation of the fluorescent substance among the excitation light irradiated to the fluorescent substance, the same fluorescent substance (15-G) or another fluorescence And a re-irradiation system (12, 3, 22, 23, 43, 53) that re-irradiates the material (35-R, 35-B, 45-R, 45-B) as excitation light. .

  Invention of Claim 2 is the light source device using the fluorescent substance of Claim 1, Comprising: Excitation light which the said excitation light source (11-B) emits The direction where the said fluorescent substance (15-G) was arranged The first reflector (12) that reflects toward the light source and the light emitted from the fluorescent material and the excitation light that transmits without contributing to the excitation of the fluorescent material are directed toward the direction in which the first reflector is disposed. A second reflector (13) that reflects, a lens (14) that collimates the light emitted by the fluorescent material and the excitation light reflected by the second reflector, and the first reflector and the lens. A dichroic mirror (3) disposed between and reflecting the light emitted from the fluorescent material and transmitting the excitation light, and the first reflector (12) does not contribute to the excitation of the fluorescent material. The excitation light reflected by the second reflector is Wherein the re-irradiation system for re-irradiated to the fluorescent substance as the excitation light of the substance is formed.

  The invention of claim 3 is a light source device using the fluorescent material according to claim 2, wherein the fluorescent material (15-G) emits one of the three primary colors of RGB. , Another light source (17-R, 17-B) that emits the other two colors is provided, and the dichroic mirror (3) reflects one color light from the fluorescent material, The three primary colors are synthesized by transmitting the other two colors of light from the light source.

  Invention of Claim 4 is a light source device using the fluorescent substance of Claim 1, Comprising: The said excitation light source (31-UV) inject | emits ultraviolet light or near-ultraviolet light as excitation light, Three types of fluorescent materials (35-R, 35-G, and 35-B) that emit light of three primary colors of RGB are provided as fluorescent materials that emit light upon irradiation with excitation light from an excitation light source. The first fluorescent substance (35-G) of the three kinds of fluorescent substances is irradiated with excitation light from the excitation light source, and the excitation light transmitted without contributing to excitation of the first fluorescent substance is transmitted. A dichroic mirror (22) that splits the transmitted excitation light and irradiates the other two types of fluorescent materials (35-R, 35-B) as the re-irradiation system is disposed on the path. And

  Invention of Claim 5 is a light source device using the fluorescent substance of Claim 1, wherein the excitation light source (31-UV) emits ultraviolet light or near ultraviolet light as excitation light, Three types of fluorescent materials (45-R, 45-G, and 45-B) that emit three primary colors of RGB are provided as the fluorescent materials that emit light upon receiving the excitation light from the excitation light source. The first fluorescent material (45-G) of the three types of fluorescent materials is irradiated with excitation light from the excitation light source, and the excitation light transmitted without contributing to the excitation of the first fluorescent material is transmitted. An optical system that irradiates the second fluorescent material (45-R) and irradiates the third fluorescent material (45-B) with the transmitted excitation light without contributing to the excitation of the second fluorescent material. (43, 53) as the re-irradiation system, and further, the three kinds of fluorescent substances Characterized in that it comprises 45-R, 45-G, 45-B) combining optical system for white light a light synthesized emitting by the (46, 47, 48).

  According to the light source device of the present invention, the light from the excitation light source can be used as the excitation light of the fluorescent substance with high efficiency without waste, and the light utilization efficiency can be increased.

It is a schematic block diagram of the light source device of 1st Embodiment of this invention. It is a schematic block diagram of the light source device of 2nd Embodiment of this invention. It is a schematic block diagram of the light source device of 3rd Embodiment of this invention. It is a schematic block diagram of the light source device of 4th Embodiment of this invention.

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

  The light source device of each embodiment described below includes a solid-state light-emitting element that is an excitation light source, a fluorescent material that emits light upon irradiation with excitation light emitted by the solid-state light-emitting element, and a fluorescent material among excitation light irradiated to the fluorescent material. A re-irradiation system that re-irradiates the excitation light transmitted or reflected without contributing to the excitation of the substance as the excitation light of the same fluorescent substance or another fluorescent substance.

<First Embodiment>
FIG. 1 is a schematic configuration diagram of a light source device M1 according to the first embodiment.

  The light source device M1 includes a green light emitting unit 1G that emits green light G, a red light emitting unit 1R that emits red light R, a blue light emitting unit 1B that emits blue light B, and a red light emitting unit 1R. A first dichroic mirror 2 that combines the red light R and the blue light B from the blue light emitting unit 1B, and a green light emitting unit further added to the red light R and the blue light B synthesized by the first dichroic mirror 2 And a second dichroic mirror 3 that emits white light by combining green light G from 1G.

  The green light emitting unit 1G irradiates the fluorescent material 15-G with excitation light to cause the fluorescent material 15-G to emit green light, and includes a blue light emitting laser diode 11-B as a solid light emitting element that is an excitation light source. The green light emitting unit 1G includes a light source side assembly 4, a fluorescent material side assembly 5, and a second dichroic mirror 3 disposed between the light source side assembly 4 and the fluorescent material side assembly 5. The second dichroic mirror 3 is configured with an inclination of 45 ° with respect to the optical axis (straight line) connecting the light source side assembly 4 and the fluorescent material side assembly 5.

  The light source side assembly 4 includes a circuit board 10, a plurality of blue light emitting laser diodes (excitation light sources) 11-B arranged on the circuit board 10, and blue light (excitation light) of the blue light emitting laser diodes 11-B. And a light tunnel (first reflector) 12 that reflects B in the direction in which the fluorescent substance-side assembly 5 is disposed.

  The light tunnel 12 has a tapered shape in which a base end opening is positioned at a position surrounding the mounting region of the blue light emitting laser diode 11-B on the surface of the circuit board 10, and the opening gradually widens from the base end opening. The opening faces the fluorescent material side assembly 5 through the dichroic mirror 3.

  The fluorescent material side assembly 5 has a bottom wall 13 a and a peripheral side wall 13 b, and a reflecting cylinder (second reflector) 13 whose inner surface is configured as a reflecting mirror, and an inner surface of the bottom wall 13 a of the reflecting cylinder 13. The green light emitting fluorescent material 15-G is arranged, and a convex lens 14 is arranged on the opening side of the peripheral side wall 13b of the reflecting cylinder 13. The fluorescent material 15-G has a property of emitting green light G, which is one of the three primary colors of RGB, using blue light B from the blue light emitting laser diode 11-B as excitation light.

  The reflecting cylinder 13 emits green light G emitted from the fluorescent material 15-G and excitation light (blue light) B reflected by the bottom wall 13a of the reflecting cylinder 13 without contributing to excitation of the fluorescent material 15-G. Reflected toward the direction in which the tunnel 12 is arranged. The convex lens 14 transmits the green light G emitted from the fluorescent material 15-B and the light (green light G and excitation light B) reflected by the reflecting tube 13 forward as parallel light.

  The second dichroic mirror 3 reflects the green light G emitted from the fluorescent material 15-G and emits light of other wavelengths, that is, blue light B (excitation light) from the blue light emitting laser diode 11-B and red light. The red light R from the light emitting part 1R and the blue light B from the blue light emitting part 1B are transmitted. The first dichroic mirror 2 has the same inclination angle as the second dichroic mirror 3 and is 45 ° with respect to the path of the red light R from the red light emitting unit 1R and the blue light B from the blue light emitting unit 1B. And has the property of reflecting the red light R from the red light emitting section 1R and transmitting the blue light B from the blue light emitting section 1B.

  The remaining two colors (red and blue) of RGB other than green are a red light emitting unit 1R and a blue light emitting unit 1B each having a red light emitting diode 17-R and a blue light emitting diode 17-B, which are separate light sources. And provided by. The red light emitting unit 1R and the blue light emitting unit 1B include a circuit board 16, a red light emitting diode 17-R and a blue light emitting diode 17-B mounted on the circuit board 16, and light emitting diodes 17-R and 17 respectively. It is comprised with the convex lens 18 which makes the light which -B emits parallel light.

  In the light source device M1 of the present embodiment, the light tunnel 12 does not contribute to excitation of the fluorescent material 15-G, and the excitation light (blue light B) reflected by the reflecting cylinder 13 is the same fluorescent material 15-. This corresponds to a reirradiation system in which the fluorescent material 15-G is reirradiated as G excitation light.

  The operation of the light source device M1 will be described.

  Blue light B (excitation light) from the plurality of blue light emitting laser diodes 11 -B arranged on the circuit board 10 is made into substantially parallel light by the tapered light tunnel 12. The blue light B emitted from the blue light emitting laser diode 11-B, which has been made substantially parallel light, passes through the second dichroic mirror 3, is collected by the convex lens 14, and emits green light by blue light excitation. -G is irradiated, and the fluorescent material 15-G emits green light G by excitation. The green light G emitted from the fluorescent material 15-G is scattered in all directions, but is reflected by the bottom wall 13a and the peripheral side wall 13b of the reflecting cylinder 13 surrounding the back surface and the side surface of the fluorescent material 15-G. The green light G that travels is converted into substantially parallel light by passing through the convex lens 14, and the second dichroic mirror 3 that reflects the green light inclined by 45 ° is used to move the light source side assembly 4 and the fluorescent material side assembly 5 upward. It is reflected in the direction orthogonal to the optical axis (straight line) to be connected.

  The red light R and the blue light B emitted from the red light emitting diode 17-R and the blue light emitting diode 17-B are converted into parallel light by the convex lens 18 and then combined by the first dichroic mirror 2. , Enters the second dichroic mirror 3.

  On the other hand, of the blue light G (excitation light) irradiated to the fluorescent material 15-G, the blue light G that has not been excited by the fluorescent material 15-G is the bottom of the reflecting cylinder 13 that covers the fluorescent material 15-G. The light is reflected by the wall 13a and the peripheral side wall 13b, passes through the convex lens 14, becomes substantially parallel light, passes through the second dichroic mirror 3 reflecting green light, and proceeds toward the light source side assembly 4. Thereafter, the blue light B that has not been excited by the fluorescent material 15-G is reflected by the tapered light tunnel 12 and changes its direction, and is returned to the fluorescent material side assembly 5 again. This contributes to G excitation.

  Since the red light R and the blue light B are transmitted through the second dichroic mirror 3 reflecting green, the red light R and the blue light B are combined with the green light G reflected by the second dichroic mirror 3 and emitted to the outside as white light. Therefore, since parallel white light is obtained, it can be used in place of a conventional lamp.

  Thus, since the excitation light (blue light B) that has not contributed to the excitation of the fluorescent material 15-B is reflected by the light tunnel 12 and re-irradiated to the same fluorescent material 15-G, the blue light emitting laser diode 11- The light from B can be used as excitation light for the fluorescent material 15-G with high efficiency without waste, and the light use efficiency can be increased.

  In the above embodiment, the case where the blue laser light (blue light B) is used as the excitation light has been described. However, ultraviolet light or near ultraviolet light (UV) can also be used as the excitation light. In that case, a fluorescent material that emits green light when excited by ultraviolet light or near ultraviolet light is used.

Second Embodiment
FIG. 2 is a schematic configuration diagram of the light source device M2 of the second embodiment.

  This light source device M2 is a light source side assembly including a UV light emitting laser diode (excitation light source) 31-UV which is a solid light emitting element that generates ultraviolet light or near ultraviolet light (hereinafter referred to as “UV light”) as excitation light. 20 and green light emitting part 21G that emits green light G upon receiving irradiation of UV light (indicated by an arrow UV in the figure) that is excitation light, blue light emitting part 21B that generates blue light B, and red light R are generated. And a red light emitting unit 21R. As the near-ultraviolet light, for example, a laser diode that emits light having a center wavelength of 405 nm can be used. The green light emitting unit 21G and the blue light emitting unit 21B are arranged in a positional relationship facing each other, and the red light emitting unit 21R is arranged in a positional relationship orthogonal to a straight line connecting the green light emitting unit 21G and the blue light emitting unit 21B. ing. Further, between the green light emitting part 21G and the blue light emitting part 21B, an X-shaped blue light reflecting dichroic mirror 22 and a green light reflecting dichroic mirror 23 are arranged in an opposite direction by 45 ° (both of them are combined). "X-type dichroic mirror" or "cross dichroic mirror") is disposed, and a transmission plate 24 having a UV reflecting film is disposed at the emission portion of the light source device M2. Here, a UV transmission reflection film is formed on the back surface of the dichroic mirror 22 that reflects blue light.

  The light source side assembly 20 includes a circuit board 30, a plurality of UV light emitting laser diodes (excitation light sources) 31-UV disposed on the circuit board 30, and UV from the UV light emitting laser diode (excitation light source) 31-UV. It is composed of a convex lens group 32 that makes the light substantially parallel light, and is disposed behind the green light emitting part 21G with the path of the emitted light of the convex lens group 32 facing the bottom of the green light emitting part 21G.

  The green light emitting unit 21G emits green fluorescent material 35-G by irradiating the fluorescent material 35-G with UV light, which is excitation light. The bottom wall 33a made of a transparent glass substrate and the inner surface are reflective surfaces. A bottomed cylindrical body 33 having a peripheral side wall 33b, a green light emitting fluorescent material 35-G disposed on an inner surface of a bottom wall 33a made of a transparent glass substrate of the bottomed cylindrical body 33 via a green light reflecting film, And a convex lens 34 disposed on the opening side of the peripheral side wall 33b of the bottomed cylindrical body 33. In this case, the fluorescent material 35-G uses the UV light emitted from the light source side assembly 20 and transmitted through the bottom wall 33a made of the transparent glass substrate of the bottomed cylindrical body 33 as excitation light, and the three primary colors of RGB. Of these, the green light G that is one color is emitted.

  Further, the blue light emitting unit 21B has a bottom wall 36a and a peripheral side wall 36b, and the reflecting tube 36 whose inner surface is configured as a reflecting mirror, and the blue light emitting fluorescence disposed on the inner surface of the bottom wall 36a of the reflecting tube 36. The material 35 -B and a convex lens 37 disposed on the opening side of the peripheral side wall 36 b of the reflecting cylinder 36 are configured. The fluorescent material 35-B has a property of emitting blue light B, which is one of the three primary colors of RGB, using UV light as excitation light.

  The red light emitting section 21R includes a reflecting tube 36 having a bottom wall 36a and a peripheral side wall 36b, the inner surface of which is configured as a reflecting mirror, and a red light emitting fluorescent material disposed on the inner surface of the bottom wall 36a of the reflecting tube 36. 35-R and a convex lens 37 disposed on the opening side of the peripheral side wall 36b of the reflecting cylinder 36. The fluorescent material 35-R has a property of emitting red light R, which is one of the three primary colors of RGB, using UV light as excitation light.

  Next, the operation will be described.

  The UV light from the UV light emitting laser diode (excitation light source) 31 -UV becomes substantially parallel light by passing through the convex lens group 32. The UV light that has become substantially parallel light is transmitted through the bottom wall 33a made of a transparent glass substrate of the bottomed cylindrical body 33, and is applied to the UV-excited green light-emitting phosphor 35-G disposed on the inner surface of the bottom wall 33a. Irradiated.

  Since the fluorescent material 35-G is arranged on the inner surface of the bottom wall 33a made of a transparent glass substrate via a green light reflecting film, the green light G generated by the fluorescent material 35-G is caused by the action of the reflecting film. It advances only to the opening side of the bottomed cylindrical body 33. Further, since the inner surface of the peripheral side wall 33b of the bottomed cylindrical body 33 is also a reflecting surface, all of the green light G generated by the fluorescent material 35-G proceeds to the opening side of the bottomed cylindrical body 33 and passes through the convex lens 34. It becomes substantially parallel light by transmitting. In addition, UV that has not been excited by the fluorescent material 35 -G passes through the convex lens 34 and travels forward.

  Since a dichroic mirror 23 reflecting green light inclined by 45 ° is installed in front of the green light emitting portion 21G, the green light G is reflected upward by the dichroic mirror 23 and enters the transparent plate 24 on the emission side.

  Further, on the back surface of the blue light reflecting dichroic mirror 22 arranged so as to intersect with the green light reflecting dichroic mirror 23, a UV transmissive reflecting film (a film that transmits a part of the incident light and reflects the rest) is formed. Has been. Therefore, a part of the UV light transmitted through the green light emitting fluorescent material 35-G without contributing to the excitation of the fluorescent material 35-G is transmitted through the dichroic mirror 22 as it is, and the front blue light emitting unit 21B. The remaining part is reflected toward the red light emitting part 21R in the lower part of the figure.

  The UV light transmitted through the dichroic mirror 22 and proceeding to the blue light emitting unit 21B is collected by the convex lens 37 and irradiated to the blue light emitting fluorescent material 35-B to excite the fluorescent material 35-B. Since the back surface and the side surface of the fluorescent material 35-B are covered with the reflecting surfaces (the bottom wall 36a and the peripheral side wall 36b of the reflecting tube 36), all the blue light B emitted from the fluorescent material 35-B travels forward and is in the middle. By passing through the convex lens 37, the light becomes substantially parallel light, is reflected upward by the dichroic mirror 22 and enters the transparent plate 24 on the exit side.

  Further, the UV light reflected by the dichroic mirror 22 and traveling to the red light emitting unit 21R is collected by the convex lens 37 and irradiated to the red light emitting fluorescent material 35-R to excite the fluorescent material 35-R. Since the back surface and the side surface (the bottom wall 36a and the peripheral side wall 36b of the reflecting tube 36) of the fluorescent material 35-R are covered with the reflective surface, all the red light R emitted from the fluorescent material 35-R travels forward and on the way. By passing through the convex lens 37, the light becomes substantially parallel light, passes through the dichroic mirror 22, and then enters the transparent plate 24 on the upper emission side in the figure.

  In this way, among the light incident on the transparent plate 24, the three colors of green light G, blue light B, and red light R are combined to become white light, which is emitted from the light source device M2. In this case, since the transparent plate 24 having the UV reflecting film is provided on the emission side, the UV light does not leak from the light source device M2 to the optical system side in the subsequent stage. Further, the UV light that has not participated in the excitation of the fluorescent materials 35-G, 35-B, and 35-R on the light source device M2 side is repeatedly reflected in the light source device M2, and the fluorescent materials 35-G and 35- Since it is absorbed by B and 35-R, almost all of the UV light is used as the excitation light. Accordingly, useless excitation light is hardly generated and the light use efficiency can be increased.

  In this case, the dichroic mirror 22 uses the UV light transmitted without contributing to the excitation of the green light-emitting fluorescent material 35-G as the excitation light, and the blue light-emitting fluorescent material 35-B and the red light emission of the blue light emitting portion 21B. This corresponds to a re-irradiation system in which the red-emitting fluorescent material 35-R of the part 21R is spectrally irradiated.

  By adjusting the coating amount of the green-emitting phosphor 35-G and the ratio of transmission and reflection of the UV transmissive reflection film of the dichroic mirror 22, the ratio of green, blue, and red light emitted can be adjusted. Final system color adjustments can be made.

<Third Embodiment>
FIG. 3 is a schematic configuration diagram of the light source device M3 of the third embodiment.

  The light source device M3 includes a light source side assembly including a UV light emitting laser diode (excitation light source) 31-UV which is a solid light emitting element that generates ultraviolet light or near ultraviolet light (hereinafter referred to as “UV light”) as excitation light. 20, a green light emitting unit 41G that generates green light G upon irradiation with UV light (indicated by an arrow UV in the drawing) that is excitation light, a red light emitting unit 41R that generates red light R, and blue light B And a blue light emitting part 41B for generating.

  The green light emitting part 41G, the red light emitting part 41R, and the blue light emitting part 41B are arranged in the order of the light emitted from the light source side assembly 20 in this order. The green light emitting unit 41G, the red light emitting unit 41R, and the blue light emitting unit 41B each have a green light emitting fluorescent material 45 as a fluorescent material that emits light when irradiated with UV light (excitation light) from the light source side assembly 20. -G, a red light emitting fluorescent material 45-R, and a blue light emitting fluorescent material 45-B are provided.

  The light source side assembly 20 includes a circuit board 30, a plurality of UV light emitting laser diodes (excitation light sources) 31-UV disposed on the circuit board 30, and UV from the UV light emitting laser diode (excitation light source) 31-UV. It is composed of a convex lens group 32 that makes light substantially parallel light, and a green light emitting part 21G, a red light emitting part 41R, and a blue light emitting part 41B are linearly arranged in the path direction of the light emitted from the convex lens group 32. Yes.

  Each fluorescent substance 45-G, 45-R, 45-B is disposed on the inner surface of the bottom wall 43b of the bottomed cylindrical light tunnel 43 in a posture inclined with respect to the path of the UV light from the light source side assembly 20. Has been. The side walls 43 a and 43 c of the light tunnel 43 are formed in parallel to each other, and a convex lens 37 is disposed at the exit of the light tunnel 43.

  The bottom wall 43b and the side walls 43a and 43c of the light tunnel 43 are made of a transparent glass substrate on which a UV transmissive film is formed. The side walls 43a and 43c are light beams with respect to the path of the UV light from the light source side assembly 20. The tunnel 43 is inclined so that the exit side of the tunnel 43 falls to the light source side. Further, the bottom wall 43 b is orthogonal to the side walls 43 a and 43 c and is inclined with respect to the path of the UV light from the light source side assembly 20. And fluorescent substance 45-G, 45-R, 45-B is arrange | positioned at the inner surface of the bottom wall 43b. Reflective films that reflect the emitted green light G, red light R, and blue light B on the back surfaces of the fluorescent materials 45-G, 45-R, and 45-B and the inner surfaces of the side walls 43a and 43c of the light tunnel 43, respectively. Is formed.

  Then, the UV light from the light source side assembly 20 passes through the side wall 43a on the light source side of the light tunnel 43 of the green light emitting unit 41G, and then the green light emitting fluorescent material 45-G disposed on the inner surface of the bottom wall 43b. UV light that has been irradiated to the green light-emitting fluorescent material 45-G and has not contributed to the excitation of the green light-emitting fluorescent material 45-G is transmitted through the bottom wall 43b of the light tunnel 43, and the light source side of the light tunnel 43 of the next red light emitting unit 41R. The UV light that has been transmitted through the side wall 43a and irradiated onto the red light emitting fluorescent material 45-R disposed on the inner surface of the bottom wall 43b and did not contribute to the excitation of the red light emitting fluorescent material 45-R It transmits through the bottom wall 43b of the tunnel 43, passes through the side wall 43a on the light source side of the light tunnel 43 of the next blue light emitting section 41B, and is further provided with the blue light emitting fluorescent material 45 disposed on the inner surface of the bottom wall 43b. -B is irradiated

  In other words, the optical system constituted by the light tunnels 43 arranged in three oblique positions is the first green fluorescent substance 45 of the three fluorescent substances 45-G, 45-R, and 45-B. -G is first irradiated with UV light from the light source side assembly 20, and UV light transmitted without contributing to excitation of the green light emitting fluorescent material 45-G is applied to the second red light emitting fluorescent material 45-R. It is used as a re-irradiation system for irradiating the third blue-emitting fluorescent material 45-B with UV light that has been irradiated and transmitted without contributing to the excitation of the red-emitting fluorescent material 45-R.

  Here, the angle between the traveling direction of the UV light from the light source side assembly 20 and the side wall 43a of the light tunnel 43, in other words, the angle between the traveling direction of the UV light and the traveling direction of the fluorescence indicated by the broken line in FIG. Now, the attitude angle will be described. In FIG. 3, the posture angle is about 45 degrees. Since the posture angle that allows UV light to pass through the side wall 43a of the light tunnel, the fluorescent material 45-G, and the like may be used, the posture angle can actually range from about 30 degrees to 60 degrees.

  Further, by arranging the reflecting mirror 46 and the dichroic mirrors 47 and 48 in the path of light from each light tunnel 43, green light G and red light emitted by the three types of fluorescent materials 45-G, 45-R and 45-B. A synthesis optical system that combines R and blue light B into white light is configured.

  Next, the operation will be described.

  The UV light from the UV light emitting laser diode (excitation light source) 31 -UV becomes substantially parallel light by passing through the convex lens group 32. The UV light that has become substantially parallel light first passes through the side wall 43a on the light source side of the light tunnel 43 of the green light emitting section 41G and then enters the green light emitting fluorescent material 45-G disposed on the inner surface of the bottom wall 43b. Irradiated. When excited by the UV light, the fluorescent material 45-G emits green light G, and the green light G from the fluorescent material 45-G reflects inside the light tunnel 43 and travels toward the tunnel exit. The green light G adjusted to substantially parallel light by the convex lens 37 at the tunnel exit is reflected by the reflecting mirror 46 and travels in the right direction in the figure.

  On the other hand, the UV light that was not involved in the excitation of the green light emitting fluorescent material 45-G passes through the bottom wall 43b of the light tunnel 43 and travels toward the light tunnel 43 of the next red light emitting unit 41R. The UV light that has passed through the light tunnel 43 of the green light emitting unit 41G and directed to the light tunnel 43 of the next-stage red light emitting unit 41R is transmitted through the side wall 43a on the light source side and then on the inner surface of the bottom wall 43b. The red fluorescent material 45-R is irradiated. Excited by the UV light, the fluorescent material 45-R emits red light R, and the red light R from the fluorescent material 45-R reflects inside the light tunnel 43 and travels toward the tunnel exit. The red light R adjusted to substantially parallel light by the convex lens 37 at the tunnel exit is reflected by the dichroic mirror 47 on which the red light reflecting film is formed, and is combined with the green light G and travels in the right direction in the figure.

  Further, the UV light that has not participated in the excitation of the red light emitting fluorescent material 45-R further passes through the bottom wall 43b of the light tunnel 43 and travels toward the light tunnel 43 of the next blue light emitting unit 41B. The UV light that has passed through the light tunnel 43 of the red light emitting unit 41R and directed to the light tunnel 43 of the blue light emitting unit 41B of the next stage has passed through the side wall 43a on the light source side and then the inner surface of the bottom wall 43b. The blue light emitting fluorescent material 45-B disposed in the light is irradiated. When excited by the UV light, the fluorescent material 45-B emits blue light B, and the blue light B from the fluorescent material 45-B reflects inside the light tunnel 43 and travels toward the tunnel exit. The blue light R adjusted to substantially parallel light by the convex lens 37 at the tunnel exit is reflected by the dichroic mirror 48 on which the blue light reflecting film is formed, and is combined with the green light G and the red light R to become white light. It will be ejected in the direction.

  In this way, since UV light that has not been involved in the excitation of the fluorescent substance in the previous stage is sequentially used as the excitation light of the fluorescent substance in the subsequent stage, useless excitation light is hardly generated, and light use efficiency Can be increased.

  Here, the human eye has a characteristic most sensitive to green light, and the amount of green light is important for the brightness of the projection display device. Moreover, the sensitivity of blue is low for human eyes, and the contribution to the brightness of the projection apparatus is low. For this reason, in the light source device M3, the fluorescent materials 45-G and 45-R are arranged in the order of green light emission, red light emission, and blue light emission from the side closer to the solid light emitting element (UV light emitting laser diode 31-UV). 45-B. Note that UV applied to the subsequent fluorescent material (red light-emitting fluorescent material 45-R, blue light-emitting fluorescent material 45-B) depending on the coating amount of the green light-emitting and red light-emitting fluorescent materials 45-G and 45-R. The final system color adjustment can be made by controlling the amount of light and adjusting the proportion of green, blue and red light emitted.

<Fourth embodiment>
FIG. 4 is a schematic configuration diagram of a light source device M4 of the fourth embodiment.

  The light source device M4 is a light source side assembly including a UV light emitting laser diode (excitation light source) 31-UV which is a solid light emitting element that generates ultraviolet light or near ultraviolet light (hereinafter referred to as “UV light”) as excitation light. 20, a green light emitting unit 51G that generates green light G upon irradiation with UV light (indicated by an arrow UV in the drawing) that is excitation light, a red light emitting unit 51R that generates red light R, and blue light B A blue light emitting part 51B for generating

  In the third embodiment, the case where the convex lens 37 is disposed at the exit of the light tunnel 43 and the light emitted from the light tunnel 43 is adjusted to parallel light by the convex lens 37 has been described. However, in the light source device M4 of the present embodiment, The side walls 53a and 53c rising from the peripheral edge of the bottom wall 53b of the light tunnel 53 are provided with a taper angle that widens the opening toward the exit, and the light is emitted from the light tunnel 53 by utilizing the reflection at the tapered side walls 53a and 53c. The light to be adjusted is made into parallel light. Other configurations are the same as those of the light source device M3 of the third embodiment. When configured in this way, the loss of light can be reduced and the light utilization efficiency can be further improved compared with the case where the light passes through the convex lens.

M1, M2, M3, M4 Light source device R Red light G Green light B Blue light UV Ultraviolet light or near ultraviolet light (UV light)
3 Dichroic mirror 11-B Blue light emitting laser diode (excitation light source)
12 Light tunnel (first reflector, re-irradiation system)
13 Reflector tube (second reflector)
14 Convex lens 15-G Green light emitting phosphor 17-R Red light emitting part (another light source)
17-B Blue light emitting part (another light source)
22 Dichroic mirror 31-UV UV emitting laser diode (excitation light source)
35-R Fluorescent substance emitting red light 35-G Fluorescent substance emitting green light 35-B Fluorescent substance emitting blue light 43 Light tunnel (re-irradiation system)
45-R Red luminescent material 45-G Green luminescent material 45-B Blue luminescent material 46 Reflector (synthetic optical system)
47, 48 Dichroic mirror (Synthetic optical system)

Claims (5)

An excitation light source;
A fluorescent material that emits light upon irradiation with excitation light emitted from the excitation light source;
Of the excitation light irradiated to the fluorescent material, re-irradiation system that re-irradiates the excitation light transmitted or reflected without contributing to the excitation of the fluorescent material as excitation light of the same fluorescent material or another fluorescent material,
A light source device using a fluorescent material, comprising: A light source device using the fluorescent material according to claim 1,
A first reflector that reflects the excitation light emitted by the excitation light source toward the direction in which the fluorescent material is disposed;
A second reflector that reflects the light emitted by the fluorescent material and the excitation light that is transmitted without contributing to the excitation of the fluorescent material in a direction in which the first reflector is disposed;
A lens that collimates the light emitted by the fluorescent material and the excitation light reflected by the second reflector;
A dichroic mirror that is disposed between the first reflector and the lens and reflects the light emitted by the fluorescent material and transmits the excitation light;
With
The re-irradiation system configured to re-irradiate the fluorescent material with excitation light reflected by the second reflector without contributing to excitation of the fluorescent material as excitation light of the same fluorescent material by the first reflector. A light source device using a fluorescent material, A light source device using the fluorescent material according to claim 2,
The fluorescent material emits one of the three primary colors RGB, and another light source that emits the other two colors is provided.
The dichroic mirror uses a fluorescent material that reflects one color of light from the fluorescent material and synthesizes three primary colors by transmitting the other two colors of light from the other light source. Light source device. A light source device using the fluorescent material according to claim 1,
The excitation light source emits ultraviolet light or near ultraviolet light as excitation light,
As the fluorescent materials that emit light upon irradiation with excitation light from the excitation light source, three types of fluorescent materials that emit light of the three primary colors RGB are provided,
The first fluorescent material among the three fluorescent materials is irradiated with excitation light from the excitation light source, and the excitation light transmitted through the first fluorescent material without contributing to the excitation of the first fluorescent material, A light source device using a fluorescent material, characterized in that a dichroic mirror that disperses the transmitted excitation light and irradiates the other two fluorescent materials is disposed as a re-irradiation system. A light source device using the fluorescent material according to claim 1,
The excitation light source emits ultraviolet light or near ultraviolet light as excitation light,
As the fluorescent materials that emit light upon irradiation with excitation light from the excitation light source, three types of fluorescent materials that emit light of the three primary colors RGB are provided,
The first fluorescent material among the three fluorescent materials is irradiated with excitation light from the excitation light source, and the second excitation light transmitted without contributing to the excitation of the first fluorescent material. An optical system for irradiating the fluorescent material and irradiating the third fluorescent material with excitation light transmitted without contributing to the excitation of the second fluorescent material is provided as the re-irradiation system,
A light source device using a fluorescent material, further comprising a synthesis optical system that combines the light emitted from the three types of fluorescent materials into white light.

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