JP5592953B2 - Projection-type image display device - Google Patents

Description

  The present invention relates to a projection display apparatus that projects an image on a projection surface using an image display element such as a liquid crystal panel, and an illumination optical system that uses light emitting diodes, lasers, phosphors, and the like that do not use mercury as light sources. It is.

  Projection-type image display devices that display a display screen of an image display element having a structure in which a plurality of reflective or transmissive liquid crystal panels and micromirrors are arranged on a screen or board as a projection surface have been conventionally used. The illumination optical system has been devised so that an enlarged image having sufficient size and brightness can be obtained.

  In particular, in a system using a plurality of video display elements, various illumination optical systems have been proposed that suppress the deterioration of white balance and color unevenness of a color video. For example, as a light source used in the illumination optical system of the projection display apparatus disclosed in Japanese Patent Application Laid-Open No. 10-171045 (Patent Document 1), an ultrahigh pressure mercury lamp having a high luminous efficiency per input power (70 lm / W) is used. It has become mainstream. In addition, in order to improve the light beam passing rate in the first array lens and the second array lens, shortening the distance between the electrodes is a major development subject.

  In addition, ultra-high pressure mercury lamps generate a large amount of ultraviolet rays, so they put a lot of stress on organic matter such as liquid crystal light bulbs and polarizing plates that make up the illumination optical system. Problems such as a decrease in brightness occurring in a short time due to devitrification due to white turbidity are assumed.

  For this reason, development of a projection display apparatus using a solid light-emitting element such as a red, green, or blue light-emitting diode or an organic EL as a new light source has been performed, and many proposals have been made. For example, Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 2) proposes a light source device including a phosphor layer that converts ultraviolet light emitted from a solid light source into visible light, a transparent substrate, and a solid light source.

  Further, in order to solve the problem of Patent Document 2, for example, as shown in Japanese Patent Application Laid-Open No. 2009-277516 (Patent Document 3), a light source device that emits excitation light emitted from a solid light source with high efficiency even when visible light is used. Has been proposed.

Japanese Patent Laid-Open No. 10-171045 JP 2004-341105 A JP 2009-277516 A

  The technique disclosed in Patent Document 2 discloses a light source device including a phosphor layer that converts ultraviolet light emitted from a solid light source into visible light, a transparent base material, and a solid light source. Since this technology uses an excitation light source that uses high-energy ultraviolet light as excitation light, optical components irradiated with ultraviolet light are likely to be damaged, and it tends to be difficult to ensure long-term performance of the optical components.

  For this reason, in Patent Document 3, the phosphor is irradiated with visible light having lower energy than ultraviolet light as excitation light, and the phosphor is bonded to a circular base material that can be rotationally controlled. It has been proposed to improve the lifetime of the phosphor by preventing irradiation to one place.

  Hereinafter, a problem of a light source device that adheres a phosphor to a circular base material capable of rotation control and excites fluorescence by excitation light will be described with reference to the drawings.

  FIG. 4A is a main part configuration diagram of a light source device in the prior art, and FIG. 4B is an enlarged view of a disk part of the light source device. In FIG. 4A, the excitation light emitted from the excitation light source group 5 becomes substantially parallel light by the collimator lens group 6 and enters the dichroic mirror 7. The dichroic mirror 7 has a characteristic of transmitting the wavelength range of excitation light and reflecting the wavelength range of fluorescent light.

  Therefore, the excitation light passes through the dichroic mirror 7, passes through the condenser lens 8, and then enters the rotation-controllable disk 1 coated with a phosphor. The condensing lens 8 has a curvature so that incident parallel light is focused on the disk 1, and collects light as an irradiation region 40 in one place of the disk 1. The disk 1 is a circular base material having a rotation axis 2 as a central axis and capable of rotation control. The phosphor on the disk 1 excited by the excitation light emits fluorescence light. After passing through the condenser lens 8, the fluorescent light becomes substantially parallel light, is reflected by the dichroic mirror 7, and enters the subsequent illumination optical system.

  FIG. 4B shows an irradiation intensity distribution of excitation light that is emitted per unit time to a specific region of the phosphor on the disk 1. As the excitation light source, a laser light source having a small light emitting area is desirable. Since the laser emission distribution has a Gaussian distribution with the center at its maximum, the excitation light irradiation intensity 50 applied to the phosphor on the disk 1 is also a Gaussian distribution with the center at its maximum.

  Therefore, in order to prevent the excitation light from being collected at one place of the phosphor, the disk 1 is rotated around the rotation axis 2 to enlarge the region where the excitation light passes through the phosphor. The hatched actual irradiation region 3 is a region where the phosphor on the disk 1 passes through the irradiation region 40. Compared with the case where excitation light is condensed at one place of the phosphor, the circumference of the circumference becomes an irradiation region, and thus the life of the phosphor is improved.

  However, excitation light having an intensity peak is always irradiated on one circumference of the disk, which is insufficient for improving the life of the phosphor. Therefore, if the excitation light is irradiated to a position far from the rotation center, the actual irradiation region 3 can be enlarged. However, the shape of the disk becomes large and the apparatus becomes large.

  FIG. 5A shows an example in which the excitation light irradiation region 40 is irradiated so as to be long in a direction perpendicular to the rotation direction of the disk and to be short in a direction parallel to the rotation direction of the disk. In this case, the actual irradiation region 3 can be enlarged while the irradiation area remains constant as in the case of FIG.

  However, if only the longitudinal direction of the irradiation region 40 is considered, the light emission size is increased. FIG. 5B is a ray diagram of fluorescent light emitted from a region including the longitudinal direction of the excitation light region 40. The parallelism of the fluorescent light that has passed through the condenser lens 8 is reduced, and the efficiency of the illumination optical system at the subsequent stage is reduced.

  The present invention has been made in view of the above problems, and its object is to use a phosphor that emits phosphor with excitation light without causing a decrease in brightness efficiency and an increase in the size of the apparatus. It is an object of the present invention to provide a projection type image display apparatus having an improved lifetime.

  In order to solve the above-described problems, the solid-state light emitting unit that emits the excitation light according to the present invention, the fluorescent light emitting unit that emits light in a different wavelength band by the excitation light, and the light beam emitted from the fluorescent light emitting unit are modulated. In the projection type image display apparatus having an image display element and a projection lens for enlarging and projecting an optical image formed by the image display element, the fluorescent light emitting unit is rotatable by applying a phosphor on the irradiation surface of the excitation light. And a plurality of predetermined rotations with respect to the center of rotation of the disk so that the excitation light irradiation area of the irradiation surface does not overlap with the rotation surface of the excitation light rotating on the fluorescent light emitting unit. The excitation light from the solid-state light emitting unit is collected and irradiated to a plurality of areas on the irradiation surface of the fluorescent light-emitting unit, and the solid-state light emitting unit Collects the fluorescent light beam emitted by excitation A plurality of first condensing lenses, and arranged in an optical path between the condensing means and the fluorescent light emitting part, and transmits the excitation light from the fluorescent light emitting part, and the condensing means A first dichroic mirror that reflects fluorescent light from the light source, and a first optical integrator that multiplexes a plurality of fluorescent light fluxes from the light collecting means reflected by the dichroic mirror to make the illuminance distribution uniform and emits the light to the image display element And so on.

  Further, the projection type image display device of the present invention further includes a plurality of first collimator lenses that make the excitation light from the solid-state light emitting portion substantially parallel light, and a plurality of substantially parallel lights from the first collimator lens. A plurality of second condensing lenses that condense various excitation light, a plurality of second optical integrators that multiplex and emit a plurality of excitation lights from the second condensing lens and uniformize the illuminance distribution, and And a plurality of second collimator lenses that emit substantially parallel light from the second optical integrator and emit the light to the first condenser lens.

  According to the present invention, when a light source that emits a phosphor with excitation light is used, a projection-type image display device that improves the lifetime of the phosphor without reducing brightness efficiency and increasing the size of the device is provided. can do.

It is a principal part block diagram of the light source device in 1st Embodiment. It is an enlarged view of the disk part of the light source device in 1st Embodiment. It is the figure which showed intensity distribution of two adjacent irradiation areas in 1st Embodiment. It is another enlarged view of the disk part of the light source device in 1st Embodiment. It is another enlarged view of the disk part of the light source device in 1st Embodiment. It is a principal part block diagram of the light source device in 2nd Embodiment. It is the figure which showed intensity distribution of two adjacent irradiation areas in 2nd Embodiment. It is an enlarged view of the disk part of the light source device in 2nd Embodiment. It is a principal part block diagram of the light source device in 3rd Embodiment. It is an enlarged view of the disk part of the light source device in 3rd Embodiment. It is a principal part block diagram of the light source device in a prior art. It is an enlarged view of the disk part of the light source device in a prior art. It is a principal part block diagram of the light source device in another prior art. It is an enlarged view of the disk part of the light source device in another prior art. It is a schematic block diagram of the optical system of the light source device and projection type video display apparatus concerning an embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In each figure, the same parts are denoted by the same reference numerals, and the description of the parts once described is omitted.

First, a schematic configuration of an optical system of a projection display apparatus including the light source device of the present invention will be described with reference to FIG.
Blue excitation light emitted from the plurality of excitation light source groups 5 becomes substantially parallel light by the collimating lens group 6 and enters the dichroic mirror 7. Here, it is assumed that the dichroic mirror 7 has a characteristic of transmitting blue light and reflecting green light.

  The blue excitation light emitted from the excitation light source group 5 passes through the dichroic mirror 7, is condensed by the condenser lens group 4, and is applied to the rotation-controllable disk 1 to which the green phosphor is adhered. Details of the configuration of the disk 1 will be described later.

  In the green phosphor, green light is excited by blue excitation light, and the excited green light is emitted in a direction opposite to the incident direction of the blue excitation light. The green light emitted from the disk 1 passes through the condenser lens group 4 to become substantially parallel light, is reflected by the dichroic mirror 7, and is applied to the condenser lens 9.

  The dichroic mirror 10 is a mirror that transmits green light and reflects red light and blue light. The dichroic mirror 10 irradiates the multiple reflection element 17 with green light from the condensing lens 9 and from a condensing lens 16 described later. The red light and blue light are reflected to irradiate the multiple reflection element 17.

  Here, the condensing lens 9 is set to have a curvature so as to collect light at the incident aperture of the multiple reflection element 17, and the irradiation area of the disk 1, which will be described in detail later, on the incident aperture surface of the multiple reflection element 17 A light beam having a shape similar to the shape of 41 is incident.

Next, red light and blue light incident on the dichroic mirror 10 will be described.
The light source 11 is a red light source such as an LED or a semiconductor laser. The red light emitted from the light source 11 becomes substantially parallel light by the collimating lens 12 and enters the dichroic mirror 15. Here, the dichroic mirror 15 has a characteristic of transmitting red light and reflecting blue light. Therefore, the red light from the light source 11 passes through the dichroic mirror 15 and is applied to the condenser lens 16.

  On the other hand, the light source 13 is a blue light source such as an LED or a semiconductor laser. The blue light emitted from the light source 13 becomes substantially parallel light by the collimator lens 14 and enters the dichroic mirror 15. Then, the blue light from the light source 13 is reflected by the dichroic mirror 15 and applied to the condenser lens 16.

  Similar to the condenser lens 9, the condenser lens 16 is set to have such a curvature that the condenser lens 16 collects light at the incident aperture of the multiple reflection element 17. A light beam having a shape similar to the light emission shape is formed. Further, the arrangement position of the light source 11 and the light source 13 may be changed by changing the characteristics of the dichroic mirror 15.

As described above, the red light and the blue light incident on the condenser lens 16 are reflected by the dichroic mirror 10 and condensed on the multiple reflection element 17.
The

  The multiple reflection element 17 constitutes an integrator optical system. The red light, the green light, and the blue light incident on the multiple reflection element 17 are reflected by the multiple reflection element 17 a plurality of times, and the exit aperture of the multiple reflection element 17 is obtained. On the surface, the light has a uniform illuminance distribution. At this time, the shape of the exit aperture surface of the multiple reflection element 17 is substantially similar to that of the DMD element 20 which is a video display element.

  The red light, green light, and blue light emitted from the exit aperture surface of the multiple reflection element 17 pass through the condenser lens 18, are reflected by the reflection mirror 19, and are then uniformly distributed on the DMD element 20 that is an image display element. Irradiated with. At this time, the condenser lens 18 is set to a curvature that enlarges and forms an image formed on the exit aperture surface of the multiple reflection element 17 on the DMD element 20. The red, green, and blue light images generated by the DMD element 20 enter the projection lens 21 and are enlarged and projected on a screen (not shown).

  The excitation light source group 5, the light source 11, and the light source 12 described above are solid-state light emitting elements with a fast response speed and can be time-division controlled. The excitation light source group 5, the light source 11, and the light source 12 emit light for each frame in synchronization with the DMD element 20, and each color light is modulated for each color light by the DMD element 20. As a result, a projected image is formed in a surface sequential manner and projected onto the screen to obtain a color image.

  Next, the configuration of the rotation-controllable disk 1 to which the green phosphor is bonded will be described in detail. FIG. 1A is a main part configuration diagram of the optical system of the light source device according to the first embodiment, and FIG. 1B is an enlarged view of the disk portion 1 of the light source device.

  In FIG. 1A, the excitation light emitted from the excitation light source group 5 becomes substantially parallel light by the collimator lens group 6 and enters the dichroic mirror 7. The dichroic mirror 7 has a characteristic of transmitting the wavelength range of excitation light and reflecting the wavelength range of fluorescent light. Therefore, the excitation light passes through the dichroic mirror 7, passes through the condenser lens group 4, and then enters the rotation-controllable disc 1 coated with a phosphor as an irradiation region 41. In this embodiment, the condenser lens group 4 is composed of eight condenser lenses, and each condenser lens collects excitation light emitted from a plurality of excitation light sources and collimator lenses. . In FIG. 1A, two of these condenser lenses are shown.

  Fluorescent light excited by the excitation light and emitted from the disk becomes substantially parallel light after passing through the condenser lens group 4, is reflected by the dichroic mirror 7, and enters the subsequent illumination optical system. As described above, the subsequent illumination optical system is provided with the multiple reflection element 17 and multiplexes the eight fluorescent lights from the condenser lens group 4 to make the illuminance distribution uniform.

  FIG. 1B shows the irradiation shape, area and position of the irradiation region 41 irradiated by one condenser lens, and the excitation light irradiated per unit time to a specific region of the phosphor on the disk. It is a figure showing intensity distribution.

  Regarding the irradiation shape of the irradiation region 41, the aspect ratio is about 1: 1 so that it can be regarded as a substantially point light source. However, even if a rectangular or elliptical shape with an aspect ratio of about 4: 3 is used according to the shape of the image display element, there is no problem in reducing the efficiency in the subsequent illumination optical system.

  As for the irradiation area of the irradiation region 41, the irradiation area is set to about one-eighth of the area of the irradiation region 40 when one point is irradiated. Thereby, when it synthesize | combines to one point again in a back | latter stage, the light emission area and divergence angle equivalent to the irradiation area | region 40 can be reproduced, and efficiency fall does not generate | occur | produce.

  With respect to the irradiation position in the rotation direction of the irradiation region 41, the irradiation is performed at an angle that is divided into eight substantially uniformly so that the condenser lens group 4 does not interfere as much as possible. As a result, the fluorescent light emitted from the phosphor can be captured by the condenser lens group without loss.

  With the above irradiation shape, irradiation area, and irradiation position, as shown in FIG. 4, it is possible to ensure the same brightness efficiency as when irradiation is performed on one irradiation region 40.

  Next, the irradiation position in the radial direction of the irradiation region 41 will be described. The irradiation positions in the radial direction of the irradiation region 41 are different from each other in the distance from the rotation axis 2 of the disk 1, and the phosphors passing through one excitation light irradiation region do not pass through the adjacent excitation light irradiation regions. Irradiate as follows. That is, the respective irradiation positions are set so that the moving radius (radial position) of the disk 1 is different from the deflection angle in the rotation direction, and the excitation light incident on the condenser lens does not overlap.

  FIG. 1 (d) shows a state in which eight irradiation positions of the condenser lens group 4 are sequentially installed from the outermost periphery of the disk 1 toward the inner periphery in the counter-rotating direction. On the inner peripheral side, since the irradiation positions are close to each other, the condensing lens diameter is constrained.

  FIG. 1 (b) shows an irradiation intensity distribution of fluorescent light when the arrangement of FIG. 1 (d) is performed. Compared with the irradiation intensity distribution 50 when the light is condensed at one place shown in FIG. 4, the irradiation intensity distribution 51 when the light is dispersed and condensed at eight places has a reduced peak intensity and improved the lifetime of the phosphor. The In the irradiation intensity distribution 51, the intensity of the irradiation region close to the rotation axis 2 is highest because the rotation radius is small and the ratio of the irradiation size to the circumference size of one round is high.

  Conversely, if the peak intensity at the position closest to the rotation axis in the irradiation intensity distribution 51 is made smaller than the peak intensity of the irradiation intensity distribution 50, the overall excitation light intensity can be increased without reducing the lifetime of the phosphor. .

  As shown in FIG. 1 (d), since the distance between the condensing lenses is large at the outer peripheral portion of the disk 1, as shown in FIG. 1 (b), the diameter of the condensing lens arranged at the outer peripheral portion. Can be increased to increase the amount of excitation light.

  Further, as shown in FIG. 1 (e), the illumination position is set so that the moving diameter (radial position) of the disk 1 and the deflection angle in the rotation direction are different so that the same diameter condensing lenses do not overlap. It can also be determined appropriately so that the diameter is maximized.

  Next, a method for improving the lifetime of the phosphor when the phosphor passing through one excitation light irradiation region passes through a part of the adjacent excitation light irradiation region will be described. FIG. 1C is a diagram showing the intensity distribution of two adjacent irradiation regions. The dotted line represents the intensity distribution of each irradiation region, and the solid line represents the sum of the two irradiation regions. In order to obtain the same phosphor lifetime as when the phosphor passing through one excitation light irradiation region is irradiated so as not to pass through the adjacent excitation light irradiation region, the sum of the irradiation intensities of the two regions is: It is obvious that the intensity should be less than or equal to the peak intensity of one irradiation region.

  Next, another embodiment of the optical system of the light source device of the present invention will be described with reference to FIG. In the present embodiment, the intensity distribution of excitation light is improved. FIG. 2A is a main part configuration diagram of the optical system of the light source device according to the second embodiment, and FIG. 2B is an excitation light intensity distribution at the entrance / exit aperture of the multiple reflection element. 2 (c) is an enlarged view of a disk portion of the light source device according to the second invention.

  In FIG. 2A, the excitation light emitted from the excitation light source group 5 becomes substantially parallel light by the collimator lens group 6, is condensed by the condenser lens group 30, and enters the multiple reflection element group 31. The multiple reflection element is an element that obtains a light beam having a uniform intensity distribution in the exit-side opening by reflecting light multiple times on its inner surface. A glass rod called a rod lens or a hollow tube called a light pipe having a reflecting surface inside is generally used.

  The excitation light reflected a plurality of times inside the multiple reflection element group 31 passes through the collimating lens group 32 and then enters the dichroic mirror 7. The dichroic mirror 7 has a characteristic of transmitting the wavelength range of excitation light and reflecting the wavelength range of fluorescent light. Therefore, the excitation light passes through the dichroic mirror 7, passes through the condenser lens group 4, is divided into eight regions, and enters the rotation-controllable disc 1 to which the phosphor is bonded as the irradiation region 42. In FIG. 2 (a), only two regions are extracted and shown.

  At this time, since the uniform intensity distribution image formed on the exit aperture surface of the multiple reflection element group 31 is projected onto the disk 1 by the collimating lens group 32 and the condenser lens group 4, the irradiation area 42 is also formed. Has a uniform intensity distribution. The fluorescent light on the disk excited by the excitation light becomes substantially parallel light after passing through the condenser lens group 4, is reflected by the dichroic mirror 7, and enters the subsequent illumination optical system.

  In FIG. 2B, the dotted line is the excitation light intensity distribution at the incident side opening of the multiple reflection element, and the solid line is the excitation light intensity distribution at the emission side opening of the multiple reflection element. The incident aperture has a Gaussian distribution, which is the laser emission distribution, but by repeating the reflection a plurality of times, the output aperture has a uniform intensity distribution. As a result, the peak intensity is greatly reduced.

  FIG. 2C is a diagram showing the irradiation shape, area, and position of the irradiation region 42 and the intensity distribution of excitation light irradiated per unit time to a specific region of the phosphor on the disk. The irradiation shape, irradiation area, and irradiation position are the same as those described above in the first embodiment. Since each of the irradiation intensity distributions 52 of the fluorescent light has a uniform intensity distribution, the peak intensity is further reduced as compared with the irradiation intensity distribution 51 according to the first embodiment. As a result, the lifetime of the phosphor can be further improved.

  In the irradiation intensity distribution 52, the intensity of the irradiation region near the rotation axis 2 is the highest because the rotation radius is small and the ratio of the irradiation size to the circumference size of one round is high.

  Next, another embodiment of the optical system of the light source device of the present invention will be described with reference to FIG. In the present embodiment, the intensity of a plurality of excitation lights irradiated on the disk 1 is changed. In the second embodiment, the intensity reaches a peak in the irradiation region closest to the rotation axis 2. Therefore, further improvement of the phosphor life can be expected by making the irradiation intensity distribution of the disk 1 uniform.

First, an incident intensity distribution is obtained so that the irradiation intensity distribution of the disk 1 is uniform. When the incident intensity distribution of the excitation light irradiated from the rotation axis 2 of the disk 1 to the position r is E (r), the condition that the irradiation intensity distribution irradiated to the phosphor is constant regardless of the rotation radius r. (Expression 1).
E (r) ÷ 2πr = const (Equation 1)
From (Equation 1), (Equation 2) is obtained.
E (r) ∝ r (Equation 2)
That is, if the incident light intensity is proportional to the rotation radius r, the irradiation intensity distribution applied to the phosphor is constant regardless of the rotation radius r.

  FIG. 3 (a) is a configuration diagram of the main part of the optical system of the light source device according to the third embodiment for realizing the above, and FIG. 3 (b) is a diagram of the disk portion of the light source device according to the third invention. It is an enlarged view.

  In FIG. 3A, the excitation light emitted from the excitation light source group 5 becomes substantially parallel light by the collimator lens group 6, is condensed by the condenser lens group 30, and enters the multiple reflection element group 31. At that time, the number of lasers of the excitation light source group 5 is large at a position away from the rotation axis 2 of the disk 1 and is small at a position near the rotation axis 2 of the disk 1. Thereby, the incident illuminance of the excitation light incident on the disk 1 is large at a position away from the rotation axis 2 and is small at a position close to the rotation axis 2.

  The optical configuration at the latter stage is the same as that in FIG. FIG. 3B is a diagram showing the irradiation shape, area, and position of the irradiation region 43 and the intensity distribution of the excitation light irradiated per unit time on the phosphor in a specific region on the disk. The irradiation shape, irradiation area, and irradiation position are the same as those described above with reference to FIG. As described above, the irradiation intensity distribution 53 in the irradiation region 43 is uniform, and the peak intensity is further reduced as compared with the irradiation intensity distribution 52 according to the second embodiment. As a result, the lifetime of the phosphor can be further improved.

  Furthermore, by setting the position of the condensing lens shown in FIG. 1 (e), the amount of excitation light irradiated on the disk 1 can be increased.

  As another method for changing the distribution of the intensity of excitation light incident on the disk 1, the excitation light source group has a large amount of input power at a position away from the rotation axis 2 of the disk 1, and excitation is performed at a position close to the rotation axis 2 of the disk 1. A method of reducing the input power of the light source group is also conceivable.

  As described above, according to the present invention, when a light source that causes a phosphor to emit light using excitation light is used, the projection type has improved the lifetime of the phosphor without causing a decrease in brightness efficiency and an increase in the size of the apparatus. A video display device can be provided.

  In the present embodiment, an example of eight divisions has been shown, but it is needless to say that the present invention is not limited to eight divisions.

  Here, the projection display apparatus using a DMD element as the image display element has been described, but it goes without saying that the present invention can also be applied to a projection display apparatus using a liquid crystal display element.

  FIG. 6 illustrates the configuration of a time-division single-plate DLP projector optical system, but is not limited to this configuration.

  DESCRIPTION OF SYMBOLS 1 ... Disk which can be rotated, 2 ... Rotation axis, 3 ... Phosphor which passes excitation light irradiation area | region, 4 ... Excitation light condensing lens group, 5 ... Excitation light source group, 6 ... Excitation light collimator lens group, 7 ... Dichroic mirror, 8 ... excitation light condensing lens, 9 ... condensing lens, 10 ... dichroic mirror, 11 ... light source, 12 ... collimating lens, 13 ... light source, 14 ... collimating lens, 15 ... dichroic mirror, 16 ... condensing lens , 17 ... Multiple reflection elements, 18 ... Condensing lens, 19 ... Reflecting mirror, 20 ... DMD element, 21 ... Projection lens, 30 ... Condensing lens group, 31 ... Multiple reflection element group, 32 ... Collimating lens group, 40, 41, 42, 43 ... excitation light irradiation area, 50, 51, 52, 53 ... irradiation intensity distribution

Claims (8)

Formed by a solid state light emitting unit that emits excitation light, a fluorescent light emitting unit that emits light of different wavelength bands by the excitation light, a video display element that modulates a light beam emitted from the fluorescent light emitting unit, and the video display element In a projection-type image display apparatus having a projection lens for enlarging and projecting a measured optical image,
The fluorescent light emitting portion is formed by applying a phosphor on the irradiation surface of the excitation light and forming a rotatable disk shape,
A plurality of predetermined declinations and radiuses with respect to the center of rotation of the disk so that the excitation light irradiation area of the irradiation surface does not overlap the rotation surface of the excitation light rotating on the fluorescent light emitting unit. Fluorescence that is arranged at a fixed position, collects excitation light from the solid-state light emitting unit, irradiates a plurality of areas on the irradiation surface of the fluorescent light emitting unit, and excites and radiates by the fluorescent light emitting unit Condensing means comprising a plurality of first condensing lenses for condensing the luminous flux;
A first dichroic mirror that is disposed in an optical path between the condensing unit and the solid-state light-emitting unit, transmits excitation light from the solid-state light-emitting unit, and reflects fluorescent light from the condensing unit;
A projection-type image display comprising: a first optical integrator that multiplexes a plurality of fluorescent light fluxes from the light collecting means reflected by the dichroic mirror to make the illuminance distribution uniform and emits the light to the image display element. apparatus. In the projection type video display device according to claim 1,
The projection-type image display apparatus, wherein the first condenser lens of the condenser means has a different lens diameter. In the projection type video display device according to claim 1,
A first collimator lens that makes the excitation light from the solid-state light-emitting portion substantially parallel light is provided for each solid-state light-emitting portion;
A projection-type image display apparatus, wherein a plurality of substantially parallel excitation lights are incident on each of the plurality of first condenser lenses. In the projection type video display device according to claim 1,
A plurality of first collimator lenses that make the excitation light from the solid-state light emitting section substantially parallel light;
A plurality of second condensing lenses for condensing a plurality of substantially parallel excitation lights from the first collimator lens;
A plurality of second optical integrators that multiplex and emit a plurality of excitation lights from the second condenser lens and uniformize an illuminance distribution;
A projection-type image display device comprising: a plurality of second collimator lenses that emit substantially parallel light from the second optical integrator and emit the light to the first condenser lens. In the projection type video display device according to claim 4,
The first condenser lens of the condenser means has the same lens diameter;
The projection image display device, wherein the second condenser lens condenses a plurality of different substantially parallel excitation lights. In the projection type video display device according to claim 4,
The first condenser lens of the condenser means has the same lens diameter;
The plurality of second optical integrators multiplex excitation light beams having different numbers of light beams and emit the light with uniform illuminance distribution. In the projection type video display device according to claim 1,
A visible light source that emits visible light in a wavelength band different from the wavelength band emitted by the fluorescent light emitting unit;
Provided on the incident side of the first optical integrator, reflects the emitted light beam of the visible light source, transmits the emitted light from the first dichroic mirror, and emits the condensed light beam and the condensed light of the visible light source. And a second dichroic mirror for injecting the fluorescent light from the means into the first optical integrator. In the projection type video display device according to claim 7,
The emitted light of the fluorescent light emitting part is green light,
The visible light source emits red light and blue light,
A projection-type image display apparatus, wherein green light, red light, and blue light are incident on the first optical integrator in a time-sharing manner.

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