JP2015094824A - Optical element, light source device, illumination optical system, and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the achievement of wavelength conversion of light source light and a uniform illuminance distribution on an irradiation surface.SOLUTION: An optical element 100 is a tubular body having a hollow inside, and is provided with an incident port 12 at one end of the tubular body, an emission port 13 emitting incident light made incident from the incident port 12 at the other end of the tubular body, and a wavelength conversion surface 14 reflecting the light made incident from the incident port at least at a part of an inner wall of a wall part 11 of the tubular body, where the wavelength of the light made incident on the wavelength conversion surface 14 is different from the wavelength of the light reflected on the wavelength conversion surface 14.

Description

  The present invention relates to an optical element, a light source device, an illumination optical system, and an image display device.

  At present, in an image display apparatus (projector), ultra-high pressure mercury lamps and halogen lamps are mainly used as existing light sources.

  On the other hand, in recent years, so-called hybrid light sources have been used in which a solid light-emitting element such as an LED (Light Emitting Diode) or LD (Laser Diode) and a phosphor are used and a different light source is used for each emission color.

  Here, many of the phosphors used in the hybrid light source emit green, red, and yellow light using blue light as excitation light. That is, the phosphor has a function of converting the wavelength of light from the light source.

  Unlike the above-described existing light source, the hybrid light source has features such as a short time until turning on after power-on, a long life, and a wide color reproduction range.

  Further, in the illumination system of a projector, regardless of whether it is a lamp light source or a solid light source, the light from the light source has a distribution (light distribution distribution), and an illumination uniformizing element is used to make the distribution uniform. .

  In general, since the light source has a distribution of light distribution, unevenness in illuminance occurs on an irradiated surface such as a screen. The uneven illuminance on the screen means, for example, a state where the center of the irradiated surface appears bright and the four corners appear dark.

  It is conceivable to use a light guide member as an optical element that eliminates the uneven illuminance as described above. Here, as an example of the light guide member, there is a quadrangular prism-shaped transparent member called a rod integrator. The rod integrator eliminates uneven illumination by totally reflecting the inside of the transparent member many times.

  Another example of the light guide member is a so-called light tunnel or light pipe that is combined in a quadrangular prism shape with the mirror surfaces of four mirror substrates inside.

  By the way, a projector is disclosed that includes a light source that is made of a blue laser diode and emits light in a predetermined wavelength band, and a light emitting wheel that is provided with a phosphor layer and is driven to rotate (see Patent Document 1). In the technique of Patent Document 1, a phosphor layer of a light emitting wheel is irradiated with a light source to emit green or red light.

  Here, also in the technique of Patent Document 1, light emitted from the light source device is converted into light having a uniform illuminance distribution by using a light guide member.

  Moreover, the illuminating device which has a light emitting diode, a light guide, a fluorescent film, and a reflective sheet is disclosed (refer patent document 2). Here, in the technique of Patent Literature 2, the light guide and the reflection sheet are configured to sandwich the fluorescent film.

  In the technique of Patent Document 2, when light from the light emitting diode is incident from one end of the light guide, the phosphor of the fluorescent film in the light guide direction is excited, and light having a wavelength different from that of the light emitting diode is emitted from the light guide. It is emitted from.

  However, in the conventional light guide member, although either one of the wavelength conversion of the light source light or the uniform illuminance distribution on the irradiation surface can be realized, both cannot be realized.

  An object of this invention is to provide the optical element which can implement | achieve wavelength conversion of light source light, and uniform illuminance distribution in an irradiation surface.

  The present invention is a tubular body having a hollow inside, and an incident port is provided at one end of the tubular body, and an exit port through which incident light incident from the incident port is emitted is provided at the other end of the tubular body. In addition, at least a part of the inner wall of the tubular body is provided with a wavelength conversion surface that reflects the light incident from the entrance, and the wavelength of the light incident on the wavelength conversion surface and the wavelength of the light reflected from the wavelength conversion surface , Are different.

  According to the present invention, it is possible to realize wavelength conversion of light source light and uniform illuminance distribution on an irradiation surface.

1 is a perspective view showing an embodiment of an optical element according to the present invention. It is XZ sectional drawing of the optical element of FIG. It is a disassembled perspective view of the optical element of FIG. It is a perspective view which shows another embodiment of the optical element which concerns on this invention. It is a top view which shows the inner wall of the optical element of FIG. It is XZ sectional drawing of the optical element of FIG. It is XZ sectional drawing at the time of making light of three colors inject into the optical element of FIG. It is a disassembled perspective view which shows another embodiment of the optical element which concerns on this invention. It is a top view which shows the inner wall of the optical element of FIG. It is a disassembled perspective view which shows another embodiment of the optical element which concerns on this invention. It is a top view of the wall part which comprises another embodiment of the optical element which concerns on this invention, and comprises the same optical element. It is a perspective view which shows another embodiment of the optical element which concerns on this invention. It is a perspective view which shows the state which attached the opening mask in the optical element of FIG. It is XZ sectional drawing which shows the aperture mask vicinity of the optical element of FIG. It is XZ sectional drawing which shows another embodiment of the optical element which concerns on this invention. It is an optical arrangement | positioning figure which shows embodiment of the light source device which concerns on this invention. It is a schematic block diagram which shows a phosphor wheel. 1 is an optical arrangement diagram showing an embodiment of an illumination optical system according to the present invention. 1 is an optical layout diagram showing an embodiment of an image display device according to the present invention.

  Hereinafter, an optical element according to the present invention, a light source apparatus according to the present invention having the optical element, an illumination optical system according to the present invention having the light source apparatus, and an image display apparatus according to the present invention having the illumination optical system The embodiment will be described with reference to the drawings.

● Optical element (1) ●
First, an embodiment of an optical element according to the present invention will be described.

  FIG. 1 is a perspective view showing an embodiment of an optical element according to the present invention. As shown in the figure, the optical element 100 is a tubular body having a hollow inside, and includes a wall portion 11, an entrance port 12, an exit port 13, a wavelength conversion surface 14, and a reflection surface 15.

  The wall part 11 comprises the tubular body of the optical element 100 by joining the edge part of each longitudinal direction. In the present embodiment, the optical element 100 is formed in a hollow quadrangular prism shape by joining four wall portions 11. Moreover, the wall part 11 is comprised, for example using a glass substrate.

The entrance 12 is provided at one end of the tubular body, and is disposed on the outside by an LED (Light
Light from a light source such as an Emitting Diode (LD) or LD (Laser Diode) enters.

  The exit port 13 is provided at the other end of the tubular body, and light incident on the tubular body from the entrance port 12 (hereinafter also referred to as “incident light”) exits.

  The wavelength conversion surface 14 is provided on a part of the inner wall of the tubular body, for example, between the entrance 12 and a midpoint in the longitudinal direction of the tubular body.

  Here, the wavelength conversion surface 14 is a phosphor, for example, and is excited by incident light from the incident port 12. The light excited by the wavelength conversion surface 14 reflects light having a wavelength different from the wavelength of the light incident on the wavelength conversion surface 14.

  The reflection surface 15 is provided on a part of the inner wall of the tubular body, and the light reflected by the wavelength conversion surface 14 is incident and reflected toward the exit port 13. Here, the reflecting surface 15 is made of a reflective member that reflects incident light with a predetermined reflectance.

  FIG. 2 is an XZ sectional view of the optical element 100 of FIG. As shown in the figure, in the optical element 100, when blue light B1 and B2 from a light source (not shown) incident from the entrance 12 is incident on the wavelength conversion surface 14, the phosphor on the wavelength conversion surface 14 is excited and blue. The wavelengths of the lights B1 and B2 are converted, and the green lights G1 and G2 are emitted. In the figure, blue lights B1 and B2 are indicated by solid arrows, and green lights G1 and G2 are indicated by broken arrows.

  The green lights G1 and G2 that are excited and emitted by the phosphor on the wavelength conversion surface 14 are emitted in all directions. That is, the light emitted from the wavelength conversion surface 14 includes light traveling toward the wall 11. By providing the reflecting surface 15 on the wall portion 11, the green lights G <b> 1 and G <b> 2 that are the excitation light are reflected a plurality of times and directed toward the exit port 13. For this reason, in the optical element 100, it is possible to improve the light use efficiency while making the illuminance distribution of the light emitted from the light exit 13 uniform.

  Note that the phosphor of the wavelength conversion surface 14 may be excited by blue light and emit yellow light or red light. The light for exciting the phosphor on the wavelength conversion surface 14 may be ultraviolet light.

  FIG. 3 is an exploded perspective view of the optical element 100 of FIG. As shown in the figure, the wall 11 is provided with a wavelength conversion surface 14 on the entrance side and a reflection surface 15 on the exit side, with the intermediate point as a boundary.

  In order to assemble the optical element 100, the wall portions 11 are combined with each other so that the wavelength conversion surface 14 and the reflection surface 15 are on the inner side (so that a hollow quadrangular prism is formed). Use to fix.

  Note that the wavelength conversion surface 14 or the reflection surface 15 is provided only on a part of the wall 11 if the wavelength conversion and reflection of incident light can be performed and the reflected light can be emitted from the emission port 13. Also good. Further, the wavelength conversion surface 14 or the reflection surface 15 may not have the wavelength conversion surface 14 or the reflection surface 15 formed on the entire wall portion 11.

  As described above, in the optical element 100, the wavelength conversion surface 14 and the reflection surface 15 are provided at least partially on the wall portion 11. Therefore, according to the optical element 100, the wavelength conversion of the light source light and the uniform illuminance distribution on the irradiation surface can be realized by configuring as described above.

● Optical element (2) ●
Next, another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 4 is a perspective view showing another embodiment of the optical element according to the present invention. As shown in the figure, the optical element 200 according to the present embodiment is different from the optical element 100 described above in that it has a second incident port 26 provided in the wall portion 21A and a light combining member 27. Different.

  FIG. 5 is a plan view showing a wall portion of the optical element 200 of FIG. Here, (a) shows the wall portion 21A, (b) shows the wall portion 21B, (c) shows the wall portion 21C, and (d) shows the wall portion 21D. As shown in the figure, the optical element 200 is configured by joining end portions in the longitudinal direction of wall portions 21A, 21B, 21C, and 21D.

  The second entrance 26 is an opening formed in a part of the wall portion 21 </ b> A, and is provided on the side surface in the longitudinal direction of the optical element 200. Here, the second entrance 26 is provided between the wavelength conversion surface 24A and the reflection surface 25A.

  The photosynthetic member 27 has a characteristic of allowing light in a predetermined wavelength band such as a dichroic mirror to pass and reflecting (does not pass) light in other wavelength bands. It is provided between the wavelength conversion surface 24 and the reflection surface 25, specifically at a position where incident light from the second incident port 26 can enter.

  The light combining member 27 is disposed at an angle of 45 ° with respect to the incident port 12, the second incident port 26, and the output port 13 so that incident light from the second incident port 26 is reflected in the direction of the output port 13. ing.

  In the optical element 200, the wavelength conversion surfaces 24 </ b> A, 24 </ b> B, 24 </ b> C, and 24 </ b> D are provided between the incident port 12 and the second incident port 26 of the wall portion 21.

  The wall portion 21A is provided with a wavelength conversion surface 24A and a reflection surface 25A at a position where the second incident port 26 is provided and at a position where the light combining member 27 is disposed.

  The wall portions 21B, 21C, and 21D are provided with wavelength conversion surfaces 24B, 24C, and 24D and reflection surfaces 25B, 25C, and 25D, with the position where the photosynthesis member 27 is disposed as a boundary. Here, as described above, the photosynthetic member 27 is disposed at an angle of 45 ° with respect to the entrance 12, the second entrance 26, and the exit 13, so that the wavelength conversion surfaces 24B and 24C and the reflection surfaces 25B and 25C are arranged. The boundary is inclined 45 °.

  6 is an XZ sectional view of the optical element 200 of FIG. As shown in the figure, the optical element 200 receives blue light B1 from the entrance 12. The optical element 200 also receives the blue light B <b> 3 from the second incident port 26.

  Here, in order to make the blue light B1 and B3 enter the optical element 200 from two directions, the optical path of the light from one blue light source is separated into two directions by an optical system in front of the optical path (not shown), or in two directions. Corresponding methods include using two blue light sources.

  As the light combining member 27, a dichroic mirror having characteristics capable of transmitting the green light G1 and reflecting the blue light B3 is used.

  The blue light B1 incident from the incident port 12 is converted into green light G1 by the wavelength conversion surface 24C, passes through the light combining member 27, is reflected by the reflection surface 25A, and is emitted from the emission port 13.

  On the other hand, the blue light B3 incident from the second incident port 26 is reflected by the light combining member 27 provided in the light incident region from the second incident port 26, reflected by the reflecting surface 25C, and emitted from the output port 13. To do.

  FIG. 7 is an XZ cross-sectional view when three colors of light are incident on the optical element 200 of FIG. In the figure, in addition to the case where the two-color light described above is incident, the red light R1 indicated by the one-dot chain line arrow is incident from the second incident port 26.

  Here, an LED, LD, or the like that emits red light is used as a red light source (not shown). The red light source is installed in the upstream of the optical path of the optical element 200.

  The light combining member 27 uses a dichroic mirror having characteristics of reflecting blue light and red light and transmitting green light.

  The red light incident from the second entrance 26 is reflected by the light combining member 27, reflected by the reflecting surface 25 </ b> C, and exits from the exit 13.

  That is, since the optical element 200 can emit light colors of three primary colors of red, green, and blue from the emission port 13, an image display apparatus using the optical element 200 as a light source device can perform full color display.

  As described above, according to the optical element 200, the light color of the emitted light is two colors by the second incident port 26 and the light combining member 27 provided in the light incident region from the second incident port 26. Uniformity of the illuminance of the emitted light can be realized while using the above-described multicolors.

● Optical element (3) ●
Next, still another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 8 is an exploded perspective view showing still another embodiment of the optical element according to the present invention. As shown in the figure, in the optical element 300 according to the present embodiment, the optical element described above is that the first incident wall 26 is constituted by the first divided wall part 31 and the second divided wall part 32. 200.

  The first divided wall portion 31 has a total length L1 in the longitudinal direction that is shorter than the total length L in the longitudinal direction of the optical element 300. Here, one end of the first dividing wall portion 31 in the longitudinal direction is arranged in accordance with the incident port 12 of the optical element 300.

  The second dividing wall portion 32 has an overall length L2 in the longitudinal direction that is shorter than the overall length L in the longitudinal direction of the optical element 300. Here, one end in the longitudinal direction of the second divided wall portion 32 is arranged in accordance with the emission port 13 of the optical element 300.

  If L> L1 + L2, the length of the shortage of the total length L1 in the longitudinal direction of the first divided wall portion 31 and the total length L2 in the longitudinal direction of the second divided wall portion 32 is the longitudinal direction of the second entrance port 26. Of the total length La.

  FIG. 9 is a plan view showing the inner wall of the optical element 300 of FIG. Here, (a) shows the 1st division wall part 31 and the 2nd division wall part 32, (b) shows wall part 21B, (c) shows wall part 21C, (d) shows wall part 21D. Indicates. As shown in the figure, a wavelength conversion surface 34 is formed on the inner wall of the first divided wall portion 31 in the same manner as the inner walls of the optical elements 100 and 200 described above.

  In addition, a reflection surface 35 is formed on the inner wall of the second divided wall portion 32 as in the optical elements 100 and 200 described above.

  The other wall portions 21B, 21C, and 21D constituting the optical element 300 are the same as the optical element 200 described above.

  As described above, according to the optical element 300, since it is not necessary to form a hole in the wall portion in order to form the second incident port 26, the light of the emitted light can be obtained while simplifying the manufacturing process. The illuminance of the emitted light can be made uniform while making the color more than two colors.

● Optical element (4) ●
Next, still another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 10 is an exploded perspective view showing still another embodiment of the optical element according to the present invention. As shown in the figure, the optical element 400 according to the present embodiment has the third dividing wall portion 41 between the first dividing wall portion 31 and the second dividing wall portion 32 as described above. Different from the optical element 300.

  The third dividing wall portion 41 has a total length L3 in the longitudinal direction corresponding to the total length La in the longitudinal direction of the second entrance port 26 of the optical element 300 described above. Here, the 3rd division wall part 41 is translucent members, such as a glass substrate in which the dichroic film | membrane is provided.

  Further, the characteristics of the dichroic film provided on the third dividing wall portion 41 are such that blue light and red light are transmitted and green light is reflected.

  Here, it is preferable to provide an antireflection film on the surface of the light incident side opposite to the side on which the dichroic film is provided in the third dividing wall portion 41.

  In the optical elements 200 and 300 described above, since the second entrance 26 is a simple hole (opening), a part of the green light incident from the entrance 12 and excited through the wavelength conversion surface 24 is 2 may leak from the entrance 26. Due to such light leaking from the second incident port 26, there is a possibility that the light utilization efficiency is lowered in the optical elements 200 and 300.

  On the other hand, in the optical element 400, by providing the third dividing wall portion 41 having the dichroic film at the second incident port 26, the green light can be internally reflected and emitted from the emission port 13. The illuminance of the emitted light can be made uniform while improving.

● Optical element (5) ●
Next, still another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 11 is a plan view of a wall portion constituting the optical element, showing still another embodiment of the optical element according to the present invention. Here, (a) shows the wall portion 43A, (b) shows the wall portion 21B, (c) shows the wall portion 21C, and (d) shows the wall portion 21D. As shown in the figure, in the optical element according to the present embodiment, a wavelength conversion surface 34 and a reflection surface 35 are provided on a wall 43A made of one glass substrate, and the wavelength conversion surface 34 and the reflection surface 35 are provided. A second incident port 46 provided with a dichroic film is provided between them.

  As described above, according to the optical element according to the present embodiment, light leakage from the optical element has the second incident port 46 provided with the dichroic film as in the optical element 400 described above. To prevent. Therefore, according to the optical element according to the present embodiment, the illuminance of the emitted light can be made uniform while improving the light utilization efficiency.

● Optical element (6) ●
Next, still another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 12 is a perspective view showing still another embodiment of the optical element according to the present invention. As shown in the figure, the optical element 500 according to the present embodiment is different from the optical elements 100, 200, 300, and 400 described above in that an aperture mask 51 is provided.

  FIG. 13 is a perspective view showing a state in which the aperture mask 51 is attached to the optical element 500 of FIG. As shown in the figure, the aperture mask 51 is attached in the vicinity of the entrance 12. In the optical element 500, the opening 52 provided in the opening mask 51 functions as the entrance of the optical element described above.

  Here, the dimension of the opening 52 is set in accordance with the dimension of the incident region for incident light. Further, the shape of the opening 52 is not limited to the rectangle shown in FIGS. 12 and 13, and various shapes such as a circle and an ellipse can be adopted.

  On the inner wall of the opening mask 51 (the inner wall side of the optical element 500), a second reflecting surface 53 is provided that reflects light directed toward the incident port 12 toward the exit port 13.

  FIG. 14 is an XZ sectional view showing the vicinity of the opening mask 51 of the optical element 500 of FIG. As shown in the figure, the blue lights B1 and B2 incident from the opening 52 are emitted as green lights G1 and G2 through the wavelength conversion surfaces 24C and 34, respectively.

  Here, since the phosphors constituting the wavelength conversion surfaces 24C and 34 are scatterers, the light distribution of the light emitted from the phosphors is the scattered light S spreading in a hemisphere from the incident position together with the green lights G1 and G2. Resulting in a Lambertian distribution. In the scattered light S, a component directed toward the entrance 12 is also generated.

  In the optical element 500, the scattered light S traveling in the direction of the entrance 12 is reflected by the second reflecting surface 53 toward the exit 13.

  As described above, in the optical element 500, the light use efficiency can be improved by recycling the light by the aperture mask 51 having the second reflecting surface 53.

● Optical element (7) ●
Next, still another embodiment of the optical element according to the present invention will be described focusing on differences from the optical element of the above-described embodiment.

  FIG. 15 is an XZ cross-sectional view showing still another embodiment of the optical element according to the present invention. As shown in the figure, the optical element 600 according to the present embodiment is different from the optical elements 200, 300, 400, and 500 described above in that a light combining member 67 is provided.

  The photosynthetic member 67 is a flat glass in which a phosphor layer 68 is provided on one surface (incident port 12 side) and a dichroic film 69 is provided on the other surface (exit port 13 side).

  Of the blue light B4 and B5 incident from the incident port 12, the blue light B4 incident at an angle with respect to the inner wall of the optical element 600 excites the phosphor on the wavelength conversion surface. Green light G <b> 3 is emitted from the wavelength conversion surface 34.

  On the other hand, the blue light B5 that is incident on the inner wall of the optical element 600 at a parallel or small angle passes through the optical element 600 without entering the wavelength conversion surfaces 24C and 34.

  Such blue light B5 is not wavelength-converted by the wavelength conversion surfaces 24C and 34, and if it is emitted from the exit port 13, the blue light will be mixed with the emitted light more than other color lights. The color reproducibility due to is reduced.

  Therefore, in the optical element 600, by providing the phosphor layer 68 on the incident port 12 side of the photosynthetic member 67, the wavelength of blue light B5 incident on the inner wall of the optical element 600 at a parallel or small angle is converted into green light G4. can do.

  The phosphor layer 68 may be formed on a part of the photosynthetic member 67. Here, the dichroic film 69 has a characteristic of reflecting blue light and transmitting green light. When red light also enters from the third divided wall portion 41, the dichroic film 69 has a characteristic of reflecting blue light and red light and transmitting green light.

  As described above, according to the optical element 600, the light combining member 67 can reduce the light that does not excite the phosphor in the incident light from the incident port 12, and thus can improve the light utilization efficiency. .

● Light source device ●
Next, an embodiment of a light source device according to the present invention will be described.

  FIG. 16 is an optical layout diagram showing an embodiment of a light source device according to the present invention. As shown in the figure, the light source device 1 according to the present embodiment includes a first light source 2, a second light source 3, lenses 4, 7, 8, 10, an optical path separation element 5, a mirror 6, A dichroic mirror 9 and an optical element 20 are provided. Here, the optical element 20 is the optical element according to the present invention described above.

  The first light source 2 is a light source that emits blue light, and is, for example, a blue LD having a center wavelength of around 430 nm. The wavelength conversion surface of the optical element 20 is excited by light from the first light source 2, and emits green light having a wavelength of, for example, around 550 nm.

  The second light source 3 is a light source that emits red light, and is, for example, a red LED having a center wavelength of about 620 nm.

  In addition, in the light source of the light source device 1, you may produce | generate each color light using a phosphor wheel.

  FIG. 17 is a schematic configuration diagram showing the phosphor wheel 62. Here, (a) shows the front surface of the phosphor wheel 62, and (b) shows the side surface of the phosphor wheel 62. As shown in the drawing, the phosphor wheel 62 is formed with a transmissive region 63 that contains a phosphor and transmits light and a reflective region 64 that reflects light on a disk-shaped member such as a glass substrate.

  The phosphor wheel 62 is rotated by a motor 61 attached to the central axis. Depending on the incident position on the phosphor wheel 62, whether the light incident on the phosphor wheel 62 emits the excitation light that has passed through the phosphor or the light reflected from the light source is determined.

  The lenses 4 and 8 are lenses for collimating light. The lens 4 collimates the light emitted from the first light source 2 toward the optical path separation element 5. The lens 8 collimates the light emitted from the second light source 3 toward the dichroic mirror 9.

  The mirror 6 reflects the light that has passed through the optical path separation element 5 toward the lens 7.

  The lens 7 and the lens 10 are lenses for condensing light. The lens 7 condenses the light reflected by the mirror 6 toward the entrance of the optical element 20. The lens 10 condenses the light reflected or passed through the dichroic mirror 9 toward the second entrance of the optical element 20.

  In FIG. 16, the lenses 4, 7, 8, and 10 are drawn as a single lens for simplification, but a plurality of lenses may be provided at the position of each lens.

  The lenses 4, 7, 8, and 10 may be designed so that the illumination angle (NA: Numerical Aperture) or F value of each color light at the exit of the optical element 20 is uniform.

  The optical path separation element 5 is an optical element that can separate light from the first light source 2 in two directions, such as a half mirror and a polarizing plate.

  The dichroic mirror 9 has a characteristic of transmitting the red light from the second light source 3 and reflecting the blue light that has passed through the optical path separation element 5.

  Next, an operation example of the light source device 1 will be described with reference to FIG.

  The blue light emitted from the first light source 2 is collimated into parallel light by the lens 4 and enters the optical path separation element 5. The blue light is separated into light directed to the mirror 6 and light directed to the dichroic mirror 9 by the optical path separation element 5.

  The blue light incident on the mirror 6 is reflected by the mirror 6 and enters the lens 7. The blue light incident on the lens 7 is collected by the lens 7 at the entrance of the optical element 20 and enters the optical element.

  The blue light incident on the dichroic mirror 9 is reflected by the dichroic mirror 9 and enters the lens 10. The blue light incident on the lens 10 is collected by the lens 10 at the third entrance of the optical element 20 and enters the optical element 20.

  As described above, the blue light incident on the incident port of the optical element 20 is converted into green light by the wavelength conversion surface on the inner wall of the optical element, then reflected by the reflecting surface, and emitted from the emission port.

  Further, as described above, the blue light incident on the second incident port of the optical element 20 is reflected by the reflection surface of the inner wall after being reflected by the light combining member of the optical element and is emitted from the emission port.

  On the other hand, the red light emitted from the second light source 3 is collimated into parallel light by the lens 8, enters the dichroic mirror 9, and passes in the direction of the lens 10.

  The red light that has passed through the dichroic mirror 9 enters the lens 10. The red light incident on the lens 10 is collected by the lens 10 at the second entrance of the optical element 20 and enters the optical element 20.

  As described above, the red light incident on the second incident port of the optical element 20 is reflected by the reflection surface of the inner wall after being reflected by the light combining member of the optical element and is emitted from the emission port.

  The blue light, the green light, and the red light have a uniform illuminance distribution due to a plurality of reflections by the reflection surface of the optical element 20.

  As described above, according to the light source device 1, by using the optical element according to the present invention, wavelength conversion of the light source light and uniform illuminance distribution on the irradiation surface can be realized.

● Lighting optics ●
Next, an embodiment of the illumination optical system according to the present invention will be described.

  FIG. 18 is an optical arrangement diagram showing an embodiment of an illumination optical system according to the present invention. As shown in the figure, the illumination optical system according to the present embodiment includes a light source device 1 that emits light and an illumination device 70. Here, the illumination device 70 includes a first relay lens 71, a second relay lens 72, a first folding mirror 73, a second folding mirror 74, and a light modulation element 75.

  The light source device 1 is the light source device according to the present invention described above, and includes the optical element 20 according to the present invention described above.

  The first relay lens 71 and the second relay lens 72 transmit light from the light source device 1 toward the first folding mirror 73. Here, the first relay lens 71 and the second relay lens 72 are spherical or aspherical lenses.

  The first folding mirror 73 reflects the light transmitted through the first relay lens 71 and the second relay lens 72 toward the second folding mirror 74. Here, the first folding mirror 73 is a plane mirror, a spherical mirror, or a cylindrical mirror.

  The second folding mirror 74 reflects the light from the first folding mirror 73 toward the light modulation element 75. The second folding mirror 74 is a spherical mirror, an aspherical mirror, an elliptical mirror, or the like.

  The light modulation element 75 is an element that changes the irradiation direction of light toward the irradiated surface, and is specifically a DMD (Digital MicroMirror Device), for example.

  The components of the lighting device 70 described above are accommodated in the housing 76. The housing 76 is made of a metal such as a magnesium alloy or a plastic resin.

  Next, an operation example of the illumination optical system will be described.

  Light including blue light, green light, and red light emitted from the light source device 1 passes through the first relay lens 71 and the second relay lens 72 and enters the first folding mirror 73.

  The light incident on the first folding mirror 73 is reflected by the first folding mirror 73 and enters the second folding mirror 74.

  The light incident on the second folding mirror 74 is reflected by the second folding mirror 74 and enters the light modulation element 75.

  The light incident on the light modulation element 75 is emitted toward the irradiated surface with the light irradiation direction and the like being changed by the light modulation element 75.

  As described above, according to the illumination optical system according to the present embodiment, by using the light source device according to the present invention, wavelength conversion of light source light and uniform illuminance distribution on the irradiation surface can be realized. .

● Image display device ●
Next, an embodiment of the image display apparatus according to the present invention will be described.

  FIG. 19 is a schematic configuration diagram showing an embodiment of an image display apparatus according to the present invention. As shown in the figure, an image display device 80 according to the present embodiment includes a light source device 1, an illumination device 70, and a projection optical system 81 that projects light from the illumination device 70 onto a projection surface.

  Here, the light source device 1 and the illumination device 70 are the illumination optical system according to the present invention described above.

  Next, an operation example of the image display apparatus will be described.

  Light emitted from the light source device 1 through the illumination device 70 enters the projection optical system 81, passes through the lens of the projection optical system 81, and exits to the projection surface.

  As described above, according to the image display apparatus according to the present embodiment, by using the illumination optical system according to the present invention, it is possible to realize wavelength conversion of light source light and uniform illuminance distribution on the irradiation surface. it can.

DESCRIPTION OF SYMBOLS 1 Light source device 2 1st light source 3 2nd light source 4 Lens 5 Optical path separation element 6 Mirror 7 Lens 8 Lens 9 Dichroic mirror 10 Lens 11 Wall part 12 Inlet 13 Outlet 14 Wavelength conversion surface 15 Reflecting surface 20 Optical element 21 Wall part 24 wavelength conversion surface 25 reflection surface 26 second incident port 27 photosynthetic member 31 first divided wall portion 32 second divided wall portion 34 wavelength conversion surface 35 reflective surface 41 third divided wall portion 46 second incident port 51 opening mask 52 opening Numeral 53 Second reflecting surface 61 Motor 62 Phosphor wheel 63 Transmitting region 64 Reflecting region 67 Photosynthesis member 68 Phosphor layer 69 Dichroic film 70 Illuminating device 71 First relay lens 72 Second relay lens 73 First folding mirror 74 Second folding Mirror 75 Light modulation element 76 Housing 80 Image display device 81 Projection optical system 100 Optical element 200 Optical element 300 Optical element 400 Optical element 500 Optical element 600 Optical element

JP 2011-070088 A JP2012-142107A

Claims (10)

The inside is a hollow tubular body,
An entrance is provided at one end of the tubular body,
The other end of the tubular body is provided with an exit port from which incident light incident from the entrance port exits,
At least a part of the inner wall of the tubular body is provided with a wavelength conversion surface that reflects light incident from the incident port,
The wavelength of light incident on the wavelength conversion surface is different from the wavelength of light reflected from the wavelength conversion surface,
An optical element. A reflective surface is provided on the inner wall of the tubular body,
The optical element according to claim 1. A second entrance formed in a part of the inner wall;
Have
The wavelength conversion surface is provided between the entrance and the second entrance.
The optical element according to claim 1. A photosynthesis member is provided between the wavelength conversion surface and the reflection surface,
The optical element according to claim 2 or 3. The photosynthetic member is a dichroic mirror.
The optical element according to claim 4. The photosynthetic member is a flat glass in which a dichroic film is provided on one surface and a phosphor layer is provided on the other surface.
The optical element according to claim 4. In the vicinity of the entrance, there is provided a second reflecting surface that reflects light toward the entrance into the exit.
The optical element according to claim 1. A light source device comprising: a light source; and an optical element that emits light emitted from the light source,
The optical element is the optical element according to any one of claims 1 to 7.
A light source device characterized by that. A light source device that emits light; a relay lens that transmits light from the light source device; a folding mirror that reflects light transmitted through the relay lens; and a light modulation element that modulates light from the folding mirror. An illumination optical system,
The light source device is the light source device according to claim 8.
An illumination optical system characterized by that. An image display device comprising: an illumination optical system; and a projection optical system that projects light from the illumination optical system onto a projection surface,
The illumination optical system is the illumination optical system according to claim 9.
An image display device characterized by that.

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