JP2014010181A - Light source device and projecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device or the like capable of suppressing reduction in use efficiency of light emitting from a light source.SOLUTION: The light source device includes: a solid light source; a condensing element that condenses a luminous flux diverging from the solid light source; a wavelength converting member that emits illumination light at a wavelength converted by excitation light; optical path separating means that is disposed on an optical path between the condensing element and the wavelength converting member and separates an optical path of the illumination light from an optical path of the luminous flux condensed by the condensing element; and a light guide body that is disposed on an optical path of light exiting from the optical path separating means and has a first opening on the optical path separating means side and a second opening on the opposite side to the first opening. The luminous flux condensed by the condensing element passes through the optical path separating means and enters the light guide body through the first opening to irradiate the wavelength converting member; the wavelength converting member emits illumination light at a wavelength converted by using the luminous flux as excitation light; and the illumination light propagates in an opposite direction to the excitation light in the light guide body, reaches the optical path separating means via the first opening and is extracted by the optical path separating means into a direction different from the direction of the luminous flux diverging from the solid light source.

Description

  The present invention relates to a light source device that emits illumination light and a projection device that includes the light source device.

  Conventionally, a light emitting diode is used as a light source, light emitted from the light emitting diode is irradiated to the phosphor through the first light tunnel, the reflective polarizing plate, and the second light tunnel, and the light emitted from the phosphor is emitted to the second light tunnel. 2. Description of the Related Art A light source device that takes out through a light tunnel and a reflective polarizing plate is known.

  However, in the light source device, light emitted from the light emitting diode, which is a light source, is directly incident on the first light tunnel without passing through a condensing element. Therefore, the light emitted from the light emitting diode, which is divergent light, is not collected, is incident on the first light tunnel as divergent light, and travels in the direction of the reflective polarizer while being repeatedly reflected in the first light tunnel. To go. For this reason, there is a problem in that the light emitted from the light emitting diode is attenuated by repeating the reflection in the first light tunnel, and the utilization efficiency of the emitted light is lowered.

  This invention is made | formed in view of the above, and makes it a subject to provide the light source device etc. which can suppress the fall of the utilization efficiency of the emitted light from a light source.

  The light source device includes: a solid-state light source; a condensing element that condenses a light beam emitted from the solid-state light source; a wavelength conversion member that emits illumination light that has been wavelength-converted by excitation light; the condensing element; An optical path separating unit that is disposed on an optical path between the members and separates an optical path between the light beam condensed by the light collecting element and the illumination light, and disposed on an optical path of light emitted from the optical path separating unit A light guide having a first opening on the optical path separating means side and a second opening on the opposite side of the first opening, and the light beam condensed by the light collecting element is Then, the light is incident on the light guide through the optical path separating means and irradiates the wavelength conversion member, and the wavelength conversion member emits the illumination light whose wavelength is converted using the light beam as the excitation light. The illumination light travels in the opposite direction to the excitation light in the light guide It reaches the optical path separating means through the first opening, by the optical path separating means, and requirements to be taken out in a direction different from that of the light beam emanating from the solid state light source.

  According to the disclosed technology, it is possible to provide a light source device or the like that can suppress a decrease in the utilization efficiency of light emitted from the light source.

It is a figure which illustrates the light source device which concerns on 1st Embodiment. It is a figure explaining the positional relationship of a light source and a coupling lens. It is sectional drawing (the 1) which illustrates the light source device which concerns on the modification of 1st Embodiment. It is sectional drawing (the 2) which illustrates the light source device which concerns on the modification of 1st Embodiment. It is sectional drawing which illustrates the light source device which concerns on 2nd Embodiment. It is sectional drawing which illustrates the light source device which concerns on 3rd Embodiment. It is sectional drawing (the 1) which illustrates the light source device which concerns on 4th Embodiment. It is a figure which shows typically the change of the synthetic spot diameter by the presence or absence of a diffusion plate. It is sectional drawing (the 2) which illustrates the light source device which concerns on 4th Embodiment. It is a figure which illustrates the light source device which concerns on 5th Embodiment. It is sectional drawing which illustrates the light source device which concerns on 6th Embodiment. It is sectional drawing which illustrates the light source device which concerns on 7th Embodiment. It is a figure which illustrates the condition where the emitted light from a light source (light emitting diode) permeate | transmits a dichroic mirror and injects into a light tunnel. It is a figure which illustrates the irradiation distribution of the emitted light corresponding to each state of FIG. It is sectional drawing which illustrates the light source device which concerns on 8th Embodiment. It is a figure which illustrates the projection apparatus which concerns on 9th Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

<First Embodiment>
1A and 1B are diagrams illustrating a light source device according to a first embodiment, where FIG. 1A is a cross-sectional view and FIG. 1B is a plan view illustrating only the arrangement of light sources.

Referring to FIG. 1, the light source device 10 generally includes light sources 11 _{1 to} 11 ₁₆ , coupling lenses 12 _{1 to} 12 ₁₆ , a condenser lens 13, a dichroic mirror 14, a light tunnel 15, and fluorescence. It has a body 16 and a substrate 17.

The light sources 11 _{1 to} 11 ₁₆ are, for example, lasers. As the light sources 11 _{1 to} 11 _16, it is preferable to use a solid light source such as a purple to blue semiconductor laser. As the light sources 11 _{1 to} 11 ₁₆ , for example, a semiconductor laser having a central emission wavelength of about 400 nm to 470 nm can be selected. In the present embodiment, the following description will be given by taking as an example a case where a semiconductor laser that emits a light beam in the blue wavelength region is used as each of the light sources 11 _{1 to} 11 ₁₆ . Here, the luminous flux means a bundle of light rays emitted from the light source in various directions. In other words, the light beam means light traveling in a specific direction included in the light beam.

In this embodiment, an example in which ₁₆ light sources 11 _{1 to} 11 ₁₆ are arranged in a matrix of 4 rows × 4 columns is shown, but the number and arrangement of the light sources are not limited to this. For example, a plurality of light sources may be arranged in an annular shape. In that case, one ring may be sufficient and it is good also as a some concentric ring.

The coupling lenses 12 _{1 to} 12 ₁₆ are arranged one after the light sources 11 _{1 to} 11 ₁₆ respectively (however, only a part of the coupling lenses 12 _{1 to} 12 ₁₆ is shown in FIG. Absent). Each coupling lens may be configured by combining a plurality of lenses. The coupling lenses 12 _{1 to} 12 ₁₆ have a function of condensing light beams emitted from the light sources 11 _{1 to} 11 ₁₆ , respectively. The coupling lenses 12 _{1 to} 12 ₁₆ are, for example, convex lenses formed from glass or plastic. In the present embodiment, the following description will be given by taking as an example the case of using collimator lenses as the coupling lenses 12 _{1 to} 12 ₁₆ . The coupling lenses 12 _{1 to} 12 ₁₆ are a typical example of the light collecting element according to the present invention.

When a collimator lens is used as each of the coupling lenses 12 _{1 to} 12 ₁₆ , the light beam emitted from each of the light sources 11 _{1 to} 11 ₁₆ (the divergent light beam) is converted into a substantially parallel light beam by the coupling lenses 12 _{1 to} 12 _16. Is done. In other words, the positional relationship between the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ is maintained so that the light beams emitted from the coupling lenses 12 _{1 to} 12 ₁₆ become substantially parallel light beams. Yes.

The condenser lens 13 is disposed downstream of the coupling lenses 12 _{1 to} 12 ₁₆ . The condensing lens 13 is a convex lens formed of, for example, glass or plastic, and is sized so that 16 light beams emitted from each of the light sources 11 _{1 to} 11 ₁₆ can enter. The focal length of the condenser lens 13 is set so that 16 incident light beams gather at a predetermined location (substantially one point). Therefore, the ₁₆ light beams emitted from each of the light sources 11 _{1 to} 11 ₁₆ and condensed by the coupling lenses 12 _{1 to} 12 ₁₆ (made substantially parallel light) converge at a predetermined position (substantially one point). Proceed as follows.

The dichroic mirror 14 is disposed at the rear stage of the condenser lens 13. The dichroic mirror 14 has a characteristic of reflecting the wavelength band of the light beam emitted from each of the light sources 11 _{1 to} 11 ₁₆ and transmitting the wavelength band of the light beam emitted from, for example, a phosphor containing a green emission wavelength component. In the present embodiment, the following description will be made assuming that the dichroic mirror 14 has a characteristic of reflecting a light beam in the blue wavelength region and transmitting a light beam in the green wavelength region. The dichroic mirror 14 is a typical example of the optical path separation means according to the present invention.

  The light tunnel 15 is arranged at the rear stage of the dichroic mirror 14. The light tunnel 15 is, for example, a columnar light guide having a rectangular first opening 15a and a second opening 15c, and having four reflecting surfaces 15b on the inner surface. The light tunnel 15 has a function of making the illuminance uniform.

The light beams emitted from the light sources 11 _{1 to} 11 ₁₆ and made to be substantially parallel light by the corresponding coupling lenses 12 _{1 to} 12 ₁₆ are collected by the condenser lens 13, reflected by the dichroic mirror 14, and first reflected. The light enters the light tunnel 15 from the opening 15a.

  Each light beam incident on the light tunnel 15 from the first opening 15a passes through the light tunnel 15 and reaches the second opening 15c. In FIG. 1, for convenience, four of the 16 light beams are shown up to the first opening 15a, and one of them is shown up to the second opening 15c.

The phosphor 16 is disposed in the vicinity of the second opening 15 c of the light tunnel 15. Each light beam that enters the light tunnel 15 from the first opening 15a, passes through the light tunnel 15 and reaches the second opening 15c irradiates the phosphor 16. In the present embodiment, the condenser lens 13 is used. The light condensing position (predetermined location) is defined as the surface of the phosphor 16. Therefore, most of each light beam incident on the light tunnel 15 from the first opening 15a is directly reflected on the phosphor 16 without being reflected by the reflecting surface 15b. However, as described later, if there is a position error between the light source and the coupling lens, a part of the light beam may be reflected by the reflecting surface 15b and irradiate the phosphor 16.

  The phosphor 16 has a wavelength conversion function of emitting light including a wavelength component different from the wavelength band of each light beam using each irradiated light beam as excitation light. That is, in the phosphor 16, the portion irradiated with each light flux becomes a new light source (light emitting portion having a certain spread). The light emitting portion of the phosphor 16 usually has a diffusion distribution.

  For example, the phosphor 16 can have a characteristic of emitting light including a green wavelength region by using each light flux in the blue wavelength region as excitation light. In addition, the phosphor 16 may have a characteristic of emitting light including a red wavelength region using, for example, each light beam in a blue wavelength region as excitation light. Specifically, as the phosphor 16, for example, a YAG green or yellow green phosphor, a sialon green, a red phosphor, or the like can be used.

  For example, the phosphor 16 is provided on the substrate 17. In this case, the substrate 17 preferably reflects the wavelength band of light generated by the phosphor 16. In the present embodiment, the following description will be given on the assumption that the phosphor 16 generates light including the green wavelength region using each light beam in the blue wavelength region as excitation light. The phosphor 16 is a typical example of the wavelength conversion member according to the present invention.

  The light (illumination light) including the green wavelength region generated by the phosphor 16 enters the light tunnel 15 through the second opening 15c. Then, part of the light tunnel 15 travels in the opposite direction to each light beam (excitation light) without being reflected by the reflecting surface 15b, and the other part is reflected by the reflecting surface 15b while passing through the light tunnel 15 It travels in the opposite direction to the excitation light.

Then, they are superimposed and emitted from the first opening 15 a and reach the dichroic mirror 14. As described above, the dichroic mirror 14 has a characteristic of reflecting the light beam in the blue wavelength region and transmitting the light beam in the green wavelength region. Therefore, the light including the green wavelength region generated by the phosphor 16 and emitted from the first opening 15a passes through the dichroic mirror 14 and is extracted in a direction different from each light beam emitted from the light sources 11 _{1 to} 11 _16. (Dashed line in FIG. 1).

Thus, in the present embodiment, each light beam emitted from the light source 11 ₁ to 11 ₁₆ is an excitation light source, through the light tunnel 15, efficiently irradiating the phosphor 16. And the light produced | generated by the fluorescent substance 16 is made uniform with the light tunnel 15 as it is, and it can aim at the improvement of illumination efficiency and the uniformity of illumination.

Here, the effect of irradiating the phosphor 16 with each light beam (excitation light) emitted from the light sources 11 _{1 to} 11 ₁₆ via the light tunnel 15 will be described with reference to FIG. 2A and 2B are diagrams for explaining the positional relationship between the light source and the coupling lens. FIG. 2A shows a case where there is no positional error between the light source and the coupling lens, and FIG. The case where there is a position error between is shown. In FIG. 2, for convenience, only three light sources 11 _{1 to} 11 ₃ and three coupling lenses 12 _{1 to} 12 ₃ are illustrated.

When the light sources 11 _{1 to} 11 ₁₆ are lasers, divergent light is normally emitted from the light sources 11 _{1 to} 11 ₁₆ . Therefore, as shown in FIG. 2A, when there is no position error between the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ , each diverging light is once condensed by the coupling lenses 12 _{1 to} 12 _16. Can be taken out as a substantially parallel light beam and collected (converged) in one place by the condenser lens 13. The state of the cross section of each light beam at the condensing position is as shown on the right side of FIG. That is, the size of each condensing spot A when the cross section of each light beam is a condensing spot and the size of the combined spot obtained by synthesizing 16 condensing spots are the same in principle.

However, since the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ are separate members, as shown in FIG. 2B, the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 _{16 are used.} In general, there is a certain positional error Δ (optical axis deviation between the light source and the corresponding coupling lens) between the two. Some combinations of each light source and each coupling lens have a position error Δ = 1 and some have a position error Δ = 3.

Further, it is impossible to assemble the distances in the optical axis direction between the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ without error, and in reality, they are assembled with some errors. When there is a position error between the light source and the coupling lens, the cross-sectional state of each light beam is different in the position of each spot A (becomes discrete) as shown on the right side of FIG. The size of each spot A is also different. As a result, the synthesized spot B obtained by synthesizing the 16 spots A irradiates the phosphor 16 with a size approximate to the size shown by the broken line.

  For this reason, it is necessary to estimate the diameter of the combined spot B in consideration of the position error between the light source and the coupling lens, and to use the phosphor 16 having a light receiving area larger than the estimated size of the diameter of the combined spot B.

  As the light receiving area of the phosphor 16 is larger, there is no restriction on the size of the diameter of the synthetic spot B, but the size of the light emitting portion of the phosphor 16 is increased, and then the illumination light to the panel having a finite size is obtained. When it is used, the utilization efficiency is reduced. That is, in order to prevent a decrease in utilization efficiency when used as illumination light, the light receiving area of the phosphor 16 is preferably as small as possible. However, if the light receiving area of the phosphor 16 becomes smaller than the diameter of the synthetic spot B, it becomes impossible to irradiate efficiently, and the light emission efficiency of the phosphor 16 decreases.

In the present embodiment, the light beams emitted from the light sources 11 _{1 to} 11 ₁₆ that are excitation light sources are irradiated onto the phosphor 16 through the light tunnel 15 to efficiently irradiate the phosphor 16. Can do. That is, even when the combined spot diameter is larger than the light receiving area of the phosphor 16 due to a positional error between the light source and the coupling lens, the excitation light is reflected by the reflecting surface 15b of the light tunnel 15 and is reflected on the phosphor 16. Can be irradiated. Therefore, the phosphor 16 smaller than the synthetic spot diameter can be used.

  Further, the light emitted from the phosphor 16 is reflected by the reflecting surface 15b of the light tunnel 15 and can be extracted after being uniformed, so that the illumination efficiency can be improved and the illumination can be made uniform.

<Modification of First Embodiment>
The modification of the first embodiment shows an example in which the arrangement of the light source and the coupling lens is changed in the first embodiment. In the modification of the first embodiment, the description of the same components as those of the already described embodiment may be omitted.

  FIG. 3 is a cross-sectional view illustrating a light source device according to a modification of the first embodiment. In the modification of the first embodiment, a plan view illustrating only the arrangement of the light sources is the same as FIG.

Referring to FIG. 3, the light source device 10 </ b> A is different from the first embodiment in that the arrangement of the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ is changed and the condenser lens 13 is not arranged. This is different from the light source device 10 according to the embodiment (see FIG. 1). In the light source device 10A, for each pair of light sources and coupling lenses, by tilting the optical axis of the light beam emitted from the coupling lens, each light beam emitted from each coupling lens is predetermined without using the condenser lens 13. It is made to progress so that it may converge to a location.

Also in the case of the light source device 10A, if there is a position error between the light source and the coupling lens, the same problem as in the first embodiment occurs. However, also in the case of the light source device 10 </ b> A, the light beams emitted from the light sources 11 _{1 to} 11 ₁₆ that are excitation light sources are irradiated to the phosphor 16 through the light tunnel 15, and the light emitted from the phosphor 16 is emitted to the light tunnel. Since the configuration that is uniformly extracted at 15 is the same as that of the first embodiment, the same effects as those of the first embodiment can be obtained.

The arrangement of the light sources 11 _{1 to} 11 ₁₆ and the coupling lenses 12 _{1 to} 12 ₁₆ may be as shown in FIG. In the light source device 10B shown in FIG. 4, the position of the optical axis of the light source and the coupling lens is intentionally shifted (decentered) for each pair of light sources and coupling lenses, without using the condenser lens 13. Each light beam emitted from each coupling lens is advanced so as to converge at a predetermined position. Specifically, the positions of the optical axes of the light source and the coupling lens are greatly shifted as the pair of the light source and the coupling lens arranged in the periphery.

Also in the case of the light source device 10B, if there is a positional error between the light source and the coupling lens, the same problem as in the first embodiment occurs. However, also in the case of the light source device 10B, each light beam emitted from the light sources 11 _{1 to} 11 ₁₆ that are excitation light sources is irradiated to the phosphor 16 through the light tunnel 15, and the light emitted from the phosphor 16 is emitted to the light tunnel. Since the configuration that is uniformly extracted at 15 is the same as that of the first embodiment, the same effects as those of the first embodiment can be obtained.

<Second Embodiment>
In the second embodiment, an example using a tapered light tunnel will be described. In the second embodiment, description of the same components as those of the already described embodiments may be omitted.

  FIG. 5 is a cross-sectional view illustrating a light source device according to the second embodiment. In the second embodiment, a plan view illustrating only the arrangement of the light sources is the same as that in FIG.

  Referring to FIG. 5, the light source device 20 is different from the light source device 10 according to the first embodiment (see FIG. 1) in that the light tunnel 15 is replaced with a light tunnel 25. The light tunnel 25 is, for example, a truncated pyramid-shaped light guide having a rectangular first opening 25a and a second opening 25c and having four reflecting surfaces 25b on the inner surface. In the present embodiment, the condensing position (predetermined location) by the condensing lens 13 is the surface of the phosphor 16 as in the first embodiment.

  The cross section of the light tunnel 25 has a tapered shape, and the size (area) of the second opening 25c is smaller than the size (area) of the first opening 25a. Further, the size (area) of the first opening 25 a of the light tunnel 25 is larger than the size (area) of the first opening 15 a of the light tunnel 15, and the second opening 25 c of the light tunnel 25. Is smaller than the size (area) of the second opening 15 c of the light tunnel 15.

By making the area of the first opening 25 a larger than the area of the first opening 15 a of the light tunnel 15, it is possible to make it easier to capture each light beam (combined beam) emitted from the light sources 11 _{1 to} 11 _16. . Further, by making the area of the second opening 25c smaller than the area of the second opening 15c of the light tunnel 15, the area of the phosphor 16, that is, the area of the secondary light emitting part can be reduced.

  Further, since the light tunnel 25 has a tapered cross section, the light emitted from the phosphor 16 at a large angle is reflected in the light tunnel 25 to reduce the divergence angle. It can be taken out. That is, it can be used as illumination light more efficiently.

<Third Embodiment>
In the third embodiment, an example in which the condensing position is different from that in the second embodiment will be described. In the third embodiment, the description of the same components as those of the already described embodiments may be omitted.

  FIG. 6 is a cross-sectional view illustrating a light source device according to the third embodiment. In the third embodiment, the plan view illustrating only the arrangement of the light sources is the same as FIG.

  Referring to FIG. 6, the light source device 30 is different from the light source device 20 according to the second embodiment (see FIG. 5) in that the light tunnel 25 is replaced with a light tunnel 35. The light tunnel 35 is, for example, a truncated pyramid-shaped light guide having a rectangular first opening 35 a and a second opening 35 c and having four reflecting surfaces 35 b on the inner surface.

  The cross section of the light tunnel 35 has a tapered shape, and the area of the second opening 35c is smaller than the area of the first opening 35a. The area of the first opening 35 a of the light tunnel 35 is smaller than the area of the first opening 25 a of the light tunnel 25, and the area of the second opening 35 c of the light tunnel 35 is the same as that of the light tunnel 25. The area of the second opening 25c is substantially the same.

In the second embodiment, the condensing position by the condensing lens 13 is the surface of the phosphor 16 (near the second opening 25c). Therefore, in order to capture all the light beams (excitation light) emitted from the light sources 11 _{1 to} 11 ₁₆ into the light tunnel 25, it is necessary to sufficiently increase the size of the first opening 25a.

In the present embodiment, the condensing position by the condensing lens 13 is in the vicinity of the first opening 35a. That is, the main light rays of the respective light beams (excitation light) emitted from the light sources 11 _{1 to} 11 ₁₆ are collected in a finite range in the vicinity of the first opening 35a. However, as described with reference to FIG. 2, if there is a position error between the light source and the coupling lens, the combined spot diameter increases compared to the case where there is no position error.

  In order to take in the excitation light with a wide combined spot diameter without loss, the first opening 35a is preferably made as large as possible. On the other hand, when the illumination efficiency to the panel is taken into consideration, it is preferable to make the first opening 35a as small as possible. Making the condensing position by the condensing lens 13 the vicinity of the 1st opening part 35a like this Embodiment is the most effective method which satisfies this conflicting condition. With this configuration, the area of the first opening 35 a of the light tunnel 35 can be made smaller than the area of the first opening 25 a of the light tunnel 25.

  Each light beam (excitation light) collected in the vicinity of the first opening 35a is reflected by the reflecting surface 35b of the light tunnel 35 as shown in FIG. Wavelength converted. The subsequent operation is the same as in the other embodiments. Here, the vicinity of the first opening 35a means the position of the first opening 35a and the light from the first opening 35a within a range in which each light beam reflected by the dichroic mirror 14 is not kicked by the first opening 35a. Refers to the position moved in the axial direction.

  That is, the condensing position by the condensing lens 13 may be shifted to the second opening 35c side from the first opening 35a in a range where each light beam reflected by the dichroic mirror 14 is not kicked by the first opening 35a. However, the first opening 35a may be shifted to the dichroic mirror 14 side. The range of the condensing position by the condensing lens 13 can be determined in consideration of the required area of the first opening 35a.

As described above, the position where the combined spot diameter of the light beams emitted from the light sources 11 _{1 to} 11 ₁₆ is the smallest (condensing position by the condensing lens 13) is set in the vicinity of the first opening 35a of the light tunnel 35. Thus, each light beam can be efficiently taken into the light tunnel 35. In addition, since the size of the first opening 35a, which is also the emitting portion of the illumination light emitted from the phosphor 16, can be reduced, it is possible to improve the illumination efficiency for the subsequent panel.

<Fourth embodiment>
In 4th Embodiment, the example which arrange | positions a diffusion plate on the optical path between a light source and fluorescent substance in 2nd Embodiment is shown. Note that in the fourth embodiment, the description of the same component as the already described embodiment may be omitted.

  FIG. 7 is a cross-sectional view illustrating a light source device according to the fourth embodiment. In the fourth embodiment, a plan view illustrating only the arrangement of the light sources is the same as FIG.

  Referring to FIG. 7, the light source device 40 is the light source device according to the second embodiment in that a diffusion plate 41 is disposed in the vicinity of the first opening 25 a between the dichroic mirror 14 and the light tunnel 25. 20 (see FIG. 5). The diffusion plate 41 has a function of diffusing incident light and emitting it. As the diffusion plate 41, for example, ground glass, opal glass, a diffractive optical element, a hologram element, or the like can be used.

Of the light sources 11 ₁ to 11 ₁₆ each light flux emitted from the light (excitation light), the principal ray of the light beam emitted from the light source 11 ₃ illustrating the operation as an example. Principal ray of the light beam emitted from the light source 11 _3, dichroic via dichroic mirror 14 to reach the diffusion plate 41, the linearity is somewhat compromised by the diffusion plate 41, the maximum base point position to pass the diffusion plate 41, Several degrees of light spread occurs.

  FIG. 7 shows a state where the light beam spread by the diffusion plate 41 travels. Although it depends on the specifications of the diffuser plate 41, it is preferable that it spreads to about 1 to 2 degrees, or at most about 3 to 5 degrees. As shown in FIG. 7, by inserting the diffusion plate 41, not only the light directly irradiated to the phosphor 16 but also the light diffused by the diffusion plate 41 is irradiated to the phosphor 16. The upper irradiation area becomes wider. In other words, the irradiation area on the phosphor 16 arranged in the vicinity of the second opening 25c is widened by the spread of the light rays of several degrees.

  FIGS. 8A and 8B are diagrams schematically showing changes in the combined spot diameter depending on the presence or absence of a diffusion plate. FIG. 8A shows a case where there is no diffusion plate, and FIG. 8B shows a case where there is a diffusion plate. As shown in FIG. 8A, when the diffuser plate 41 is not provided, each spot position irradiates the phosphor 16 in a state where the spot position is appropriately varied due to a position error between the light source and the coupling lens.

  The diameter of each spot A varies, and the synthesized spot B obtained by synthesizing the 16 spots A irradiates the phosphor 16 with a size approximated to the size shown by the broken line. In addition, depending on the variation in the diameter and position of each spot A, a non-irradiated region C may occur.

  As shown in FIG. 8A, the presence of the region C that is not irradiated means that the excitation light is concentrated on the irradiated portion. If there is a portion irradiated in such a concentrated manner, the phosphor 16 may be damaged earlier, resulting in lower efficiency, lower reliability, and lower brightness, resulting in lower quality.

  By inserting the diffusing plate 41, the excitation light is dispersed, so that the non-irradiated region C does not exist as shown in FIG. 8B, and the above problem can be solved. That is, by inserting the diffusion plate 41, a laser beam with high linearity spreads, and the light is diffused and dispersed even in a region where the phosphor 16 is not irradiated unless the diffusion plate 41 is inserted. A brighter light source device that can irradiate the body 16 and has high conversion efficiency can be realized.

The diffuser plate 41 may be inserted anywhere as long as it is on the optical path between the light sources 11 _{1 to} 11 ₁₆ and the phosphor 16, but the light sources 11 ₁ to 11 as in the light source device 40 A shown in FIG. It is preferably inserted on the optical path between ₁₆ and the dichroic mirror 14. In the light source device 40 shown in FIG. 7, the diffusing action by the diffusion plate 41 acts on both the excitation light and the light generated by the phosphor 16, whereas in the light source device 40A shown in FIG. This is because the diffusion action acts only on the excitation light.

<Fifth embodiment>
In the fifth embodiment, an example in which the phosphor is rotated in the second embodiment will be described. Note that in the fifth embodiment, description of the same components as those of the above-described embodiment may be omitted.

  10A and 10B are diagrams illustrating a light source device according to a fifth embodiment, where FIG. 10A is a cross-sectional view, and FIG. 10B is a plan view illustrating only a phosphor (from the H direction in FIG. 10A). View). In the fifth embodiment, a plan view illustrating only the arrangement of the light sources is the same as FIG.

  Referring to FIG. 10, the light source device 50 is different from the light source device 20 (see FIG. 5) according to the second embodiment in that the phosphor 16 is disposed on a rotating substrate 51. Specifically, the phosphor 16 is provided in an annular shape in the vicinity of the outer periphery of the disk-shaped substrate 51 to form a wheel shape. Then, with the center of the annular phosphor 16 as the rotation center O, the phosphor 16 is rotated together with the substrate 51 by a drive unit (not shown) such as a motor.

  When the phosphor 16 is rotationally driven together with the substrate 51, the phosphor 16 moves, so that the excitation light is always applied to a new area on the phosphor 16. That is, the size of the phosphor 16 is larger than the size of the second opening 25c, and the phosphor 16 is arranged such that any region on the surface of the phosphor 16 is always exposed in the second opening 25c. Moved.

  When the substrate 51 rotates once, the same region on the phosphor 16 is irradiated with excitation light. Therefore, it is preferable to determine the rotation speed so that the fluorescence emission time is shorter than the time required for the substrate 51 to rotate once. For example, the rotation speed can be determined so that t <T, where t is the time that is 1/10 of the maximum light emission amount and T is the time that the substrate 51 rotates once.

  Since the phosphor 16 is rotationally driven together with the substrate 51, the phosphor 16 needs to be physically separated from the second opening 25c of the light tunnel 25. The distance D between the phosphor 16 and the second opening 25c is preferably as short as possible, and is preferably about 0.05 mm to 1 mm, for example. When the distance D between the phosphor 16 and the second opening 25c is 1 mm or more, the luminous flux emitted from the phosphor 16 increases the light flux that does not enter the second opening 25c of the light tunnel 25, and the efficiency is lowered. Because.

  With the configuration as shown in FIG. 10, it is possible to prevent the phosphor 16 from being damaged by continuously irradiating the excitation light on the same region on the phosphor 16. Further, it is possible to solve the problem that the phosphor 16 is deteriorated with time, specifically, the conversion efficiency of the phosphor 16 is lowered and the light quantity is lowered. In addition, when the distribution of the excitation light irradiated onto the phosphor 16 is non-uniform and extremely distributed, the phosphor 16 moves, so that the non-uniformity is reduced.

  Instead of rotating the phosphor 16, the phosphor 16 may be reciprocated. Further, the phosphor 16 may be provided on the outer periphery of the roller, and the roller may be rotated. Moreover, you may make the fine vibration below the size of the fluorescent substance 16 occur. In either case, the same effects as when the phosphor 16 is rotated are obtained.

<Sixth embodiment>
The sixth embodiment shows an example in which the light source and the coupling lens are combined into one in the second embodiment. Note that in the sixth embodiment, description of the same components as those of the above-described embodiment may be omitted.

FIG. 11 is a cross-sectional view illustrating a light source device according to the sixth embodiment. Referring to FIG. 11, the light source device 60 includes a light source ₁₁ 1 _{to 11 16} and the coupling lens ₁₂ 1 _{to 12 16} are each a point which is substituted in the light source 11 ₁ and the coupling lens 12 _1, second embodiment This is different from the light source device 20 according to the embodiment (see FIG. 5). In the present embodiment, the light source 11 ₁ is a semiconductor laser.

Light emitted from the light source 11 1 _{(semiconductor} laser) is converged by the coupling lens 12 ₁ (e.g., substantially parallel light) is incident is reflected by the dichroic mirror 14 to the first opening 25a of the light tunnel 25.

Actually, in addition to the light beam illustrated in the figure, among the light beams emitted from the light source 11 ₁ (semiconductor laser), there are also light beams that are not sufficiently converged by the coupling lens 12 ₁ . It is reflected by 25b and reaches the phosphor 16. However, most of the light beam incident on the first opening 25a can reach the phosphor 16 directly without being reflected by the reflecting surface 25b of the light tunnel 25. The light generated by the phosphor 16 is uniformly extracted by the light tunnel 25 as it is, as in the second embodiment.

Thus, if the light source and the coupling lens was Tsunishi 1 also a light beam emitted from the light source 11 ₁ is an excitation light source, and irradiated through the light tunnel 25 to the phosphor 16 emits the phosphor 16 Since the structure in which the light is uniformly extracted by the light tunnel 25 is the same as that of the second embodiment, the same effect as that of the second embodiment can be obtained.

  However, since it is not possible to increase the luminance with one light source, it is preferable to arrange a plurality of light sources as in the embodiment described above when it is necessary to increase the luminance.

<Seventh embodiment>
In the seventh embodiment, an example in which a light-emitting diode that is a solid-state light source is used as the light source in the sixth embodiment will be described. Note that in the seventh embodiment, description of the same components as those of the above-described embodiment may be omitted.

FIG. 12 is a cross-sectional view illustrating a light source device according to the seventh embodiment. Referring to FIG. 12, the light source device 70 includes a light source 11 ₁ and the coupling lens 12 ₁ is that each point is replaced by a light source 71 and the coupling lens 72, the light source device 60 according to the sixth embodiment ( 11). In the present embodiment, the light source 71 is a light emitting diode.

The light source 71 (light emitting diode) has an area of several mm ² unlike the light emitting portion of the light source 11 ₁ (semiconductor laser) of several μm, and is a rectangular, rectangular, or circular light emitting area. There are many. The light emission angle characteristic of the light source 71 (light emitting diode) is larger than that of the light source 11 ₁ (semiconductor laser), and in some cases, the characteristic is close to perfect diffusion. Thus, since the light emission area of the light source 71 (light emitting diode) is as wide as several mm ² , in this embodiment, the coupling lens 72 is configured by a plurality of lenses (for example, two lenses 72a and 72b). Thus, the coupling efficiency is improved.

Since the light emitting area of the light source 71 (light emitting diode) is as wide as several mm ² , when the light source 71 (light emitting diode) is used, it is not easy to converge the emitted light in a region smaller than the size of the light emitting region. In other words, in the conventional configuration that does not include the coupling lens 72 and the light tunnel 25, when the light source 71 (light emitting diode) is used as the excitation light source, there is a problem that the irradiation cannot be performed efficiently if the area of the phosphor 16 to be irradiated becomes small. It was.

  However, the configuration having the coupling lens 72 and the light tunnel 25 as shown in FIG. 12 makes it possible to efficiently emit the light emitted from the light source 71 (light emitting diode) without making the coupling lens 72 complicated. 16 can be led.

  FIG. 13 is a diagram illustrating a situation where light emitted from a light source (light emitting diode) passes through a dichroic mirror and enters a light tunnel. In the present embodiment, since the coupling lens 72 is disposed on the optical path, the light collection state can be selected in any way as shown in FIGS. 13 (a) to 13 (c). In FIG. 13, W represents the opening width of the second opening 25c.

  FIG. 13A schematically shows a case where the degree of light collected from the light source 71 (light emitting diode) is relatively relaxed. In the state of FIG. 13A, the condensing spot is larger than the second opening 25c, but is reflected by the reflecting surface 25b of the light tunnel 25, so that the reflected light is superimposed in the second opening 25c. The phosphor 16 is irradiated with a combined intensity distribution that is the sum of the intensity of the light that is not reflected and the reflected light.

  FIG. 13B schematically shows a case where the degree of collection of the emitted light from the light source 71 (light emitting diode) is matched to the irradiation region of the phosphor 16. In the state of FIG. 13B, the light emitted from the light source 71 (light emitting diode) is directly reflected on the phosphor 16 without being reflected in the light tunnel 25.

  FIG. 13C schematically shows a case where the degree of light collection from the light source 71 (light emitting diode) is increased to increase the number of reflections on the reflection surface 25b of the light tunnel 25. In the state of FIG. 13C, the degree of condensing of the emitted light from the light source 71 (light emitting diode) is increased, and the emitted light is condensed before reaching the phosphor 16. Although the light beam spreads after being condensed, the light is reflected by the reflecting surface 25 b of the light tunnel 25 a plurality of times and led to the phosphor 16.

  FIG. 14 is a diagram illustrating an irradiation distribution of emitted light corresponding to each state of FIG. The illuminance distribution shown in FIG. 14 is an irradiation distribution of light emitted from the light source 71 (light emitting diode) in the vicinity of the second opening 25c of the light tunnel 25.

In FIG. 14A corresponding to the state of FIG. 13A, the distribution intensity X of the light beam that irradiates the phosphor 16 without being reflected by the reflecting surface 25b of the light tunnel 25, and the reflecting surface 25b of the light tunnel 25. Thus, the distribution intensity Y _{1 of the} light beam that is reflected once and irradiated onto the phosphor 16 is combined to obtain a combined intensity Z. In FIG. 14B corresponding to the state of FIG. 13B, the distribution intensity X of the light beam irradiated on the phosphor 16 without being reflected by the reflecting surface 25b of the light tunnel 25 becomes the combined intensity as it is.

In FIG. 14C corresponding to the state of FIG. 13C, the distribution intensity X of the light beam that is irradiated on the phosphor 16 without being reflected by the reflection surface 25 b of the light tunnel 25, and the reflection surface 25 b of the light tunnel 25. The distribution intensity Y ₁ of the light beam reflected once on the phosphor 16 and the distribution intensity Y _{2 of the} light beam reflected twice on the light tunnel 25 and irradiated on the phosphor 16 are combined. Thus, the composite strength Z is obtained. That is, since a plurality of reflected lights are superimposed, a more uniform combined intensity Z can be obtained.

  Ideally, if there is no reflection loss due to reflection at the reflection surface 25b of the light tunnel 25, the state of FIG. However, since the internal reflection of the light tunnel 25 is used in FIG. 14C, the irradiation intensity to the phosphor 16 is lower than that when the phosphor 16 is efficiently irradiated as shown in FIG. 14B, for example. Become. In addition, when the intensity | strength of the fluorescence emitted from the fluorescent substance 16 is fully securable, the state of Fig.14 (a) and FIG.14 (b) may be sufficient. That is, the degree of concentration of the emitted light from the light source 71 (light emitting diode) can be set in any way according to the characteristics of the phosphor 16.

  14 (a) to 14 (c) only show representative states, and the design of the coupling lens 72, the positional relationship with the light tunnel 25, and the first opening 25a of the light tunnel 25. Depending on the size of the second opening 25c, the taper angle of the light tunnel 25, and the like, various states may occur. Therefore, the light intensity emitted from the phosphor 16 can be appropriately designed so as to increase.

  Thus, in the present embodiment, since the coupling lens 72 is disposed at the subsequent stage of the light source 71 (light emitting diode), the degree of light collected from the light source 71 (light emitting diode) is changed according to the required specifications. The irradiation distribution to the phosphor 16 can be adjusted. As a result, the luminous efficiency of the phosphor 16 can be maximized, and a more efficient light source device can be realized.

<Eighth embodiment>
The eighth embodiment shows an example in which the position of the phosphor is changed in the second embodiment. Note that in the eighth embodiment, description of the same components as those of the above-described embodiment may be omitted.

  FIG. 15 is a cross-sectional view illustrating the light source device according to the eighth embodiment. Referring to FIG. 15, the light source device 80 is different from the light source device 20 (see FIG. 5) according to the second embodiment in that the substrate 17 is replaced with the substrate 87.

  The substrate 87 has a structure in which a protruding portion 87x is formed on a flat portion, and the phosphor 16 is provided at the tip portion of the protruding portion 87x. When viewed from the first opening 25a side of the light tunnel 25, the protrusion 87x has a smaller shape than the second opening 25c, and a part of the protrusion 87x passes through the second opening 25c. Has been inserted inside. That is, in the light source device 80, the phosphor 16 is disposed in the light tunnel 25.

  In the second embodiment, the phosphor 16 is disposed in the vicinity of the second opening 25c of the light tunnel 25, but the phosphor 16 may be disposed in the light tunnel 25 as shown in FIG. Good. Although not shown, the phosphor 16 may be disposed outside the second opening 15c of the light tunnel 25 (on the side opposite to the first opening 25a).

  As described above, the phosphor 16 may be disposed in the light tunnel 25 or outside the second opening 15c of the light tunnel 25 (on the side opposite to the first opening 25a). The same effects as those of the second embodiment in which the is disposed in the vicinity of the second opening 25c are produced. However, in the case where the phosphor 16 is disposed in the light tunnel 25, in addition to the effects exhibited by the second embodiment, it is possible to further capture all of the fluorescence emitted from the phosphor 16 by the light tunnel 25. It has an excellent effect of becoming.

<Ninth embodiment>
The ninth embodiment shows an example in which the light source device according to the second embodiment is applied to a projection device. Note that in the ninth embodiment, description of the same components as those of the above-described embodiments may be omitted.

FIG. 16 is a diagram illustrating a projection device according to the ninth embodiment. Referring to FIG. 16, the projection apparatus 100 includes a light source device 20 _1, the light source unit 20 _2, the light source device 90, a condenser lens 101 to 104, a condensing mirror 105, a dichroic mirror 106 and 107, A panel 108, a projection lens 109, a drive control unit 110, and an interface 111 are included. Reference numeral 120 denotes an external input device.

  The condensing lenses 101 to 104, the condensing mirror 105, and the dichroic mirrors 106 and 107 are typical examples of the transmission optical system according to the present invention. The projection lens 109 is a typical example of the projection optical system according to the present invention.

The light source device 20 _1, the light source device 20 according to the second embodiment, in which using a red phosphor as the phosphor 16. The light source device 20 _2, in the light source device 20 according to the second embodiment, in which using a green phosphor as the phosphor 16. The light source device 90 uses a blue light emitting diode as the light source 91, takes light from the light source 91 into the light tunnel 94 through the coupling lens 92 and the condenser lens 93, and superimposes the light tunnel 94 to make it uniform. Is emitted.

Red light from the light source device 20 _1, the condenser lens 101, a condenser lens 102, the condenser mirror 105, the light source device 20 ₁ surface and the conjugate relationship of the first opening portion 25a and the panel 108 of the light tunnel 25 It is preferable that the setting is made. Green light from the light source device 20 _2, the condenser lens 103, a condenser lens 102, the condenser mirror 105, and the surface of the first opening portion 25a and the panel 108 of the light source device 20 _{and second} light tunnel 25 is in the relationship of conjugation It is preferable to set so as to be. The blue light from the light source device 90 is set by the condenser lens 104, the condenser lens 102, and the condenser mirror 105 so that the opening on the exit side of the light tunnel 94 and the surface of the panel 108 are in a conjugate relationship. It is desirable that

The green light from the red light and the light source device 20 ₂ from the light source device 20 ₁ are combined by the dichroic mirror 106 enters the dichroic mirror 107. The light synthesized by the dichroic mirror 106 and the blue light from the light source device 90 are synthesized by the dichroic mirror 107, and the light paths of all colors coincide with each other and enter the condenser mirror 105. The dichroic mirror 106 has a characteristic of reflecting green light and transmitting red light. The dichroic mirror 107 has a characteristic of reflecting blue light and transmitting green light and red light.

  The panel 108 has a plurality of pixels and has a function of controlling whether or not the illumination light is directed to the projection lens 109 for each pixel (controlling ON / OFF of the illumination light). As the panel 108, for example, a so-called digital micromirror array can be used. Note that although there is only one panel 108, a red image, a green image, and a blue image can be sequentially displayed. That is, when an image of each color is displayed on the panel 108, the light source device of that color is driven to emit light to illuminate at high speed (the illumination light is switched at high speed).

In other words, according to the display information on the panel 108, the light source device 20 ₁ , the light source device 20 ₂ , and the light source device 90 are time-divided and controlled to be turned on. The lighting control is performed by the drive control unit 110 connected to the external input device 120 via the interface 111. Switching between color images is very fast, and full-color display can be performed using the afterimage phenomenon of eyes. An enlarged image of the image information displayed on the panel 108 is formed at a position conjugate with the surface of the panel 108 by the projection lens 109.

Incidentally, in the projection device 100, instead of the light source device 20 ₁ may be used solid-state light source such as a red light emitting diode and a red laser. Furthermore, transmission in the projection device 100, the blue light from the light source device 90, the light source device 20 ₁ of the light source 11 _1, etc. incident from the opposite side to the dichroic mirror 14, is reflected by the dichroic mirror 14, the dichroic mirror 14 You may combine with red light.

Furthermore, transmission in the projection device 100, the blue light from the light source device 90, the light source device 20 _{and second} light sources 11 _1, etc. incident from the opposite side to the dichroic mirror 14, is reflected by the dichroic mirror 14, the dichroic mirror 14 You may combine with green light. Regarding color synthesis, various arrangements other than the above are conceivable, and the present invention is not limited to the above configuration.

  By using at least one light source device shown in each embodiment or its modification in the projection device 100, brighter illumination light can be obtained, and a bright projection device can be realized.

  The preferred embodiment and its modification have been described in detail above, but the present invention is not limited to the above-described embodiment and its modification, and the above-described implementation is performed without departing from the scope described in the claims. Various modifications and substitutions can be added to the embodiment and its modifications.

  For example, each embodiment or its modification can be combined as appropriate. If an example is given, the structure of 8th Embodiment is applicable to the light source device which concerns on each embodiment containing the light source device which concerns on 2nd Embodiment. Or you may apply the structure of the modification of 1st Embodiment to the light source device which concerns on other embodiment. Various other modifications are possible.

  In each embodiment and its modification, the light emitted from the light source is reflected by the dichroic mirror and is incident on the light tunnel. However, the light source, the dichroic mirror, and the light tunnel may be arranged in a substantially straight line, and the light emitted from the light source may be transmitted through the dichroic mirror and incident on the light tunnel. In this case, the light from the phosphor can be extracted by being reflected by the dichroic mirror.

  However, when a laser is used as the light source, the laser light has polarization characteristics and the reflectance can be increased as S-polarized light. Therefore, the S-polarized laser light is emitted from the light source, and the S-polarized laser light is reflected by the dichroic mirror. Therefore, it is preferable that the light incident on the light tunnel can improve the reflectance at the dichroic mirror.

10, 10A, 10B, 20, 20 ₁ , 20 ₂ , 30, 40, 40A, 50, 60, 70, 80, 90 Light source device 11 _{1 to} 11 ₁₆ , 71 Light source 12 _{1 to} 12 ₁₆ , 72 Coupling lens 13 , 101, 102, 103, 104 Condensing lens 14, 106, 107 Dichroic mirror 15, 25, 35 Light tunnel 15a, 25a, 35a First opening 15b, 25b, 35b Reflecting surface 15c, 25c, 35c Second opening Reference Signs List 16 Phosphor 17, 51 Substrate 41 Diffuser 72a, 72b Lens 105 Condenser Mirror 108 Panel 109 Projection Lens 110 Drive Control Unit 111 Interface 120 External Input Device

US Pat. No. 7,854,514

Claims (12)

A solid light source;
A condensing element that condenses the light flux emanating from the solid-state light source;
A wavelength conversion member that emits illumination light that has been wavelength-converted by excitation light; and
An optical path separating unit that is disposed on an optical path between the condensing element and the wavelength conversion member, and that separates an optical path between the light beam condensed by the condensing element and the illumination light;
A light guide disposed on the optical path of the light emitted from the optical path separating means, and having a first opening on the optical path separating means side and a second opening on the opposite side of the first opening; ,
The light beam condensed by the light condensing element is incident on the light guide through the first opening through the optical path separating means to irradiate the wavelength conversion member, and the wavelength conversion member emits the light beam. Emitting the illumination light wavelength-converted as the excitation light;
The illumination light travels in the light guide in the opposite direction to the excitation light and reaches the optical path separation means through the first opening, and the light beam diverging from the solid light source by the optical path separation means. A light source device that is taken out in different directions.   The light source device according to claim 1, wherein the wavelength conversion member is disposed in the light guide body. The wavelength conversion member is disposed outside the second opening,
The light beam incident on the light guide from the first opening through the optical path separating unit irradiates the wavelength conversion member through the second opening, and the wavelength conversion member excites the light beam through the excitation. Emitting the illumination light wavelength-converted as light,
The illumination light enters the light guide through the second opening, travels in the light guide in the opposite direction to the excitation light, reaches the optical path separating means through the first opening, and the optical path. The light source device according to claim 1, wherein the light source device is extracted by a separating unit in a direction different from the light beam diverging from the solid light source. A plurality of the solid light sources,
For each of the solid light sources, a condensing element for condensing a light beam emanating from the solid light source is disposed,
4. The light beam emitted from each solid light source and collected by each light condensing element travels so as to converge at a predetermined position and enters the optical path separating means. 5. The light source device according to claim 1.   The light source device according to claim 4, wherein the predetermined portion is a surface of the wavelength conversion member.   The light source device according to claim 4, wherein the predetermined location is in the vicinity of the first opening.   The light source device according to any one of claims 1 to 3, wherein the light beam diverging from the solid-state light source is condensed on a surface of the wavelength conversion member by the condensing element.   4. The light source device according to claim 1, wherein the light beam diverging from the solid light source is condensed in the vicinity of the first opening by the condensing element. 5.   The light source device according to any one of claims 1 to 8, wherein a size of the second opening is smaller than a size of the first opening.   The light source device according to claim 1, wherein a diffusion plate that diffuses and emits incident light is disposed on an optical path between the solid-state light source and the wavelength conversion member. The size of the wavelength conversion member is larger than the size of the second opening,
11. The light source device according to claim 1, further comprising a movable unit that moves the wavelength conversion member so that any region of the surface of the wavelength conversion member is always exposed in the second opening. . A transmission optical system that transmits the illumination light extracted from the light source device according to any one of claims 1 to 11 to a panel that forms an image;
A projection optical system that enlarges and projects the image formed on the panel.

Images