JP5180677B2 - Illumination device and projection-type image display device using the same - Google Patents

Description

  The present invention relates to an illumination device using an integrator lens and a projection display apparatus using the same.

  2. Description of the Related Art Conventionally, as a device for displaying a large screen image, there has been known a projection type image display device that irradiates a liquid crystal panel with the powerful light of an illumination device and enlarges and projects the image displayed on the liquid crystal panel on a screen. Yes.

  In addition, in an illumination device used in this type of projection display apparatus, partial luminance unevenness present in the light emitted from the light source is averaged to reduce the difference in light between the screen center and the peripheral portion. Therefore, an integrator lens composed of a plurality of convex lenses (regardless of the direction of the convex lens on the light incident side or the light emitting side) is used.

  As shown in FIG. 6, the integrator lens 101 generally includes an incident side lens array 102 and an output side lens array 103. The light source 104 in this example includes a concave reflecting mirror 104b that collimates the light emitted from the light emitting unit 104a, and is configured to emit substantially parallel light to the incident side lens array 102. The light incident on one convex lens 102 a positioned at the center of the incident side lens array 102 is focused near the convex lens 103 a positioned at the center of the output side lens array 103 and passes near the center of the condenser lens 105. After being incident on the condenser lens 106, the entire surface of the liquid crystal panel 107 is irradiated. Further, as indicated by a broken line, the light incident on one convex lens 102b located away from the center of the incident side lens array 102 is focused near the convex lens 103b located away from the center of the outgoing side lens array 103. Finally, the light is refracted in the central direction by the condenser lens 105, enters the condenser lens 106, and is irradiated on the entire surface of the liquid crystal panel 107. In this manner, the integrator lens 101 averages the partial luminance unevenness existing in the light by guiding the light from the individual convex lenses 102 b of the incident side lens array 102 to the entire surface of the liquid crystal panel 107. This point is as described in Patent Document 1.

  In addition, as in such an illuminating device, there is an illuminating device that does not directly guide the light from the light source to the integrator lens but guides it to the integrator lens through an optical path changing member composed of a plurality of reflecting mirrors. is there. Such an illuminating device is often used when light from a plurality of light sources is combined by an optical path changing member and applied to an integrator lens. One example is described in Patent Document 2. This will be described with reference to FIG.

This illuminating device has two divided light sources 202 and 203 as a light source 201, and an optical path changing member 204 is provided between the two divided light sources 202 and 203. Each of the divided light sources 202 and 203 includes light emitting units 202a and 203a and concave reflecting mirrors 202b and 203b that collimate light from the light emitting units 202a and 203a. The optical path changing member 204 has a reflection mirror 205 for the split light source 202 and a reflection mirror 206 for the light source 203. The reflection mirror 205 includes a plurality of divided reflection mirrors 205a to 205c, each of which forms 45 degrees with respect to the optical axis, and is disposed in different planes parallel to each other. The reflection mirror 206 also includes a plurality of divided reflection mirrors 206a to 206c, each of which forms 45 degrees with respect to the optical axis, and is arranged in different planes parallel to each other. In addition, each of the divided reflection mirrors 205a to 205c and 206a to 206c is paired and arranged in a mountain shape with their edges aligned. Then, the reflected light from the divided reflection mirrors 205a to 205c formed in a mountain shape and distributed and the reflected light from the divided reflection mirrors 206a to 206c do not overlap each other and have no gap between the incident side lens array 207A in the integrator lens 207. The light is incident on the light incident surface alternately. The light near the center of the light source 201 is irradiated near the center of the integrator lens 207, and the light near the periphery of the light source 201 is irradiated near the periphery of the integrator lens 207. Further, the light from the individual convex lenses constituting the integrator lens 207 is guided and superimposed on the entire surface of a light valve (not shown) that performs light modulation.
JP 2001-296604 A Japanese Patent Laid-Open No. 2001-21996

  However, in the conventional illumination device described above, the angle of the divided reflection mirrors 205a to 205c and 206a to 206c with respect to the optical axis of the divided light sources 202 and 203 is changed or divided due to component tolerances and mounting tolerances in the optical path changing member 204. The reflection mirrors 205a to 205c and 206a to 206c may be misaligned at the edge alignment positions. In addition, when such a deviation occurs, a gap is generated in the joint portion of the combined light from the optical path changing member 204, or the amount of light in the vicinity of the joint of the composite light is extremely reduced, thereby obtaining uniform light. could not. For this reason, when the synthetic light from the optical path changing member 204 is superposed by the integrator lens 207, there is a problem that uneven illuminance occurs.

  FIG. 8 is a diagram for specifically explaining this, and shows a schematic diagram of an optical path from the incident side of the incident side lens array 301A of the integrator lens 301 to the light valve 302 below, and above this optical path. The light quantity distribution state in the light valve 302 is shown corresponding to the schematic diagram. In this drawing, it is exaggerated that a slight gap is formed in the joint portion 303 of the combined parallel light that enters the incident side lens array 301A of the integrator lens 301 from the optical path changing member. Further, in the case of this figure, the connecting portion 303 in the combined light and the joint portion 301b of the convex lens 301a in the incident side lens array 301A of the integrator lens 301 are configured to coincide with each other in the optical axis direction. Further, the joint portion 301b of the convex lens 301a in the integrator lens 301 is configured such that the adjacent convex lenses 301a are in close contact with each other.

  In this case, a gap is formed in the joint portion 303 in the combined light, or the amount of light is extremely reduced. In addition, since the joint portion of the convex lens 301a and the joint portion 303 for parallel light are configured at the same position in the optical axis direction, the amount of light incident on each convex lens 301a is extremely large in the peripheral portion of the convex lens 301a. It is falling. For this reason, in the luminous flux (illustrated by a solid line) from the incident side lens array 301A of the integrator lens 301 to the light valve 302, the amount of light does not decrease within the central range sandwiched by the broken line, but between the solid line and the broken line at the edge portion. The light intensity is extremely reduced. For this reason, there is a problem in that the edge portion of the superimposed illumination light becomes unclear and the light quantity around the light valve 302 decreases. The same phenomenon occurs when the amount of light is extremely reduced even if there is no gap in the joint portion 303 in the parallel light from the optical path changing member.

  In the above description, the joint portion of the convex lens 301a and the joint portion 303 in the parallel light are configured to be at the same position in the optical axis direction. The low portion passes through the center portion of the convex lens and the like, which causes a problem of uneven illuminance at the center portion of the light valve 302 and the like. For this reason, the junction part of the convex lens 301a and the joint part 303 in parallel light are comprised in the same position in an optical axis direction.

  The present invention is made under such a background, and in an illumination device in which parallel light from a light source is reflected by a plurality of split reflection mirrors, and the reflected parallel light is superimposed by an integrator lens. An object of the present invention is to provide an illuminating device with improved illuminance unevenness of illumination light and a projection display apparatus using the illuminating device.

  An illuminating device according to the present invention includes a light source unit that emits substantially parallel light, an integrator lens having an incident side lens array and an output side lens array composed of a plurality of convex lenses, and an incident side by dividing parallel light from the light source unit. In the illuminating device including an optical path changing member composed of a split reflection mirror configured to reflect in the state of parallel light toward the light incident surface of the lens array, the integrator lens is bonded to the convex lens of the incident side lens array. And the joint between the divided parallel lights are formed so as to coincide with each other in the optical axis direction, and a gap is provided at the joint of the convex lens, and further, light is configured not to pass through the gap. It is characterized by.

  With this configuration, the parallel light from the light source is reflected by the optical path changing member as parallel light divided by the split reflection mirror toward the incident lens array in the integrator lens, and the split parallel light is connected. And the junction of the convex lens of the incident side lens array in the integrator lens are formed to coincide with each other in the optical axis direction. In addition, since a gap is provided at the joint portion of the convex lens and light is not allowed to pass through the gap, the light at the edge portion of the parallel light whose light amount is extremely reduced is incident on the convex lens of the incident side lens array. It is configured not to be incident. As a result, light having no decrease in the amount of light is incident on each convex lens of the incident-side lens array in the integrator lens, and this is superimposed, so that uniform and clear illumination light at the edge portion can be obtained.

Further, the gap provided at the junction of the convex lens of the incident side lens array in the integrator lens, may be the formed into gap between substantially equal width formed on the connecting part between the parallel light. If comprised in this way, since the incident side lens array becomes a structure in which the convex lens is not formed in the part where illumination intensity falls, it can reduce a brightness nonuniformity efficiently.

  The light source unit includes two divided light source units disposed so as to face each other with the optical path changing member interposed therebetween, and the optical path changing member includes a plurality of divided reflection mirrors corresponding to the two divided light source units, respectively. The split reflection mirror may guide the light from the two split light source units onto the integrator lens so that they do not overlap with each other. In this way, the light from each divided light source unit is incident on the integrator lens so that it does not overlap alternately, so even if one of the divided light source units is cut off, extreme luminance unevenness is caused. It will not occur. In addition, by increasing the number of light source units, the power consumption of each light source unit can be reduced and the life of the light source can be extended.

  In this case, each of the two divided light source units may be constituted by a light source lamp including a parabolic concave mirror that emits light emitted from the light emitting unit in a substantially parallel manner. If it does in this way, it can be set as a general specification by use of a general purpose light source.

  Each of the two divided light source sections includes a plurality of light source lamps each having a parabolic concave mirror that emits the light emitted from the light emitting section in a substantially parallel manner, and the plurality of light source lamps. You may make it comprise from the photosynthesis member which synthesize | combines an emitted light. In this way, the power consumption of the light source lamp can be reduced and the life of the light source lamp can be extended.

  Further, the optical path changing member is formed by combining one split reflecting mirror for each of the two split light source sections, forming a mountain shape with the edges of each other, and disposing a plurality of combination products formed in the mountain shape. May be used. If comprised in this way, the optical path change member which disperse | distributes the light from each division | segmentation light source part and irradiates an irradiation surface can be formed easily.

  Further, the optical path changing member is formed by forming one split reflecting mirror for each of the two split light source sections so as to form two adjacent surfaces of the triangular prism member, and a plurality of triangular prism members thus formed are dispersedly arranged. You may be made to do. If comprised in this way, manufacture of an optical path change member can be simplified more, and an assembly will become easy.

  The integrator lens may be configured such that light does not pass through a gap provided at a joint portion of the convex lens of the incident side lens array, and the gap is constituted by a light shielding member. If comprised in this way, since the part with little light quantity of the edge part of the parallel light from an optical path change member will be cut without entering into the convex lens of an incident side lens array, the brightness nonuniformity of the illumination light from an integrator lens will be reduced. be able to.

  In addition, instead of such a configuration, the integrator lens is configured to prevent light from passing through a gap provided at the joint portion of the convex lens of the incident side lens array. You may make it have the light converging member which gathers for a convex lens in front of the incident side of light. In this way, the amount of light to be shielded can be superimposed through the convex lens of the incident side lens array, so that the illuminance of the illumination light can be improved accordingly.

  In addition, a projection display apparatus according to the present invention includes any one of the illumination devices described above, a light valve that modulates light emitted from the illumination device based on a video signal, and light modulated by the light valve. And a projection lens for enlarging and projecting. Therefore, according to such a projection display apparatus, it is possible to obtain a clear image without uneven brightness in the periphery of the projection surface.

  In this case, the light from the illumination device is separated into the three primary colors, guided to the light valves for the respective color lights, and the light modulated by the light valves for the respective color lights is combined and projected. Also good. With this configuration, it is possible to obtain a color image with no luminance unevenness at the periphery of the projection surface.

  According to the present invention, the joint portion of the convex lens of the incident side lens array in the integrator lens and the connecting portion between the divided parallel lights reflected toward the incident side lens array are formed so as to coincide with each other in the optical axis direction. Since the gap is formed in the joint portion of the convex lens of the incident side lens array, it is possible to obtain illumination light with reduced illuminance unevenness caused by component tolerance and assembly tolerance in the optical path changing member.

(Embodiment 1)
Hereinafter, a lighting device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The illuminating device according to the present embodiment vertically aligns the parallel light from the light source unit 1 arranged so that the two divided light source units 11 and 12 that emit parallel light face each other and the two divided light source units 11 and 12. An optical path changing member 2 that divides and reflects in the direction and an integrator lens 3 that includes an incident side lens array 3A and an output side lens array (not shown) are provided. Further, the integrator lens 3 is disposed so that the normal line of the light incident surface of the incident side lens array 3A is in the same direction as the optical axis of the parallel light reflected by the optical path changing member 2.

  The divided light source units 11 and 12 are for a light source including light emitting units 11a and 12a made of metal halide lamps, and parabolic concave mirrors 11b and 12b that emit the light emitted from the light emitting units 11a and 12a as substantially parallel light. The lamps 11c and 12c are configured. And it arrange | positions so that the emitted optical axis may mutually correspond.

  The optical path changing member 2 reflects the substantially parallel light emitted from the divided light source units 11 and 12 toward the light incident surface of the incident side lens array 3A in the integrator lens 3 that is the irradiation surface while maintaining the parallel light. The reflecting mirrors 21 and 22 are arranged corresponding to the positional relationship between the divided light source units 11 and 12 and the integrator lens 3. The reflection mirror 21 is a reflection mirror for the divided light source unit 11, and the reflection mirror 22 is a reflection mirror for the divided light source unit 12. The reflection mirror 21 includes three divided reflection mirrors 21a to 21c, and the reflection mirror 22 for the divided light source unit 12 also includes three divided reflection mirrors 22a to 22c.

  Further, the split reflection mirrors 21a to 21c and 22a to 22c guide the parallel light from the two split light source units 11 and 12 onto the integrator lens 3 so that they do not overlap each other alternately. 12 are arranged. For this reason, the division | segmentation reflection mirrors 21a-21c for the division | segmentation light source parts 11 are mutually parallel, and in the position spaced apart in the emission optical axis direction of the division | segmentation light source part 11, with respect to the emitted optical axis of the division | segmentation light source part 11. It is arranged with an inclination of 45 °. Similarly, the split reflection mirrors 22a to 22c for the split light source unit 12 are also parallel to each other and 45 with respect to the output optical axis of the split light source unit 12 at positions separated in the output optical axis direction of the split light source unit 12. ° Arranged at an angle. Further, the divided reflection mirrors 21a to 21c for the divided light source unit 11 and the divided reflection mirrors 22a to 22c for the divided light source unit 12 are each formed as a pair, and the edges of the paired divided reflection mirrors are combined to form a mountain shape. The three pairs of combined products formed in a mountain shape in this manner are distributed between the two divided light source units 11 and 12.

  Further, in the above configuration, the combined product of the split reflection mirrors 21b and 22b that receives a large amount of light at the central part of the split light source units 11 and 12 is such that the substantially parallel light in this combined product is the central part on the incident surface of the incident side lens array 3A. It is arranged to be guided to. Further, in the combination product of the split reflection mirrors 21a and 22a and the combination product of the split reflection mirrors 21c and 22c that receive a lot of light in the peripheral portions of the split light source units 11 and 12, substantially parallel light in these combination products is incident side lens array 3A. It arrange | positions so that it may be guide | induced to the peripheral part in the entrance plane.

  Further, in the above-described configuration, the gap or light amount is extremely large in the joint portion 2A in the parallel light from the optical path changing member 2 as an inevitable problem due to component tolerances or mounting tolerances related to the split reflection mirrors 21a to 21c and 22a to 22c. Less part is formed.

  The incident side lens array 3A in the integrator lens 3 is composed of a plurality of convex lenses 3a. The exit side lens array is not shown here, but is configured in the same manner as the entrance side lens array 3A. The joint portion of the convex lens 3a is formed so as to coincide with the connecting portion 2A in parallel light in the optical axis direction, and a gap 3b having a width substantially equal to the width of the connecting portion 2A or the width of the extreme light amount reduction portion. Is formed. Further, the gap 3b is formed by a light shielding member so as to prevent light from passing through the gap 3b.

  Since the first embodiment is configured as described above, the optical path from the incident side of the incident side lens array 3A in the integrator lens 3 to the light valve is illustrated in FIG. It becomes like the schematic diagram of the optical path. Further, in this embodiment, as shown in FIG. 2, a gap 3 b is formed at the joint portion of the convex lens 3 a constituting the integrator lens 3. For this reason, the amount of light transmitted through the convex lens 3a is not extremely reduced in the peripheral portion, and clear illumination light at the edge portion can be obtained. As a result, luminance unevenness in the periphery of the light valve 8 is eliminated. Further, the gap 3b between the convex lenses 3a of the incident side lens array 3A in the integrator lens 3 is configured by a light shielding member so that light does not pass through. Therefore, light passes through the gap 3b and passes to the center of the light valve 8. There is no such thing as uneven brightness due to light leakage.

Since the first embodiment is configured as described above, the following effects can be obtained.
(1) The connecting portion 2A of parallel light reflected from the optical path changing member 2 and the joint portion between the convex lenses 3a of the incident side lens array 3A in the integrator lens 3 are configured to coincide with each other in the optical axis direction, and the convex lens. A gap 3b is formed at the joint portion 3a, and light is configured not to pass through the gap 3b. For this reason, it is configured so that the light at the edge portion of the parallel light whose amount of light is extremely small does not enter the convex lens 3a. As a result, light that has not decreased in amount is incident on each convex lens 3a of the incident-side lens array 3A and is irradiated so as to be superimposed, so that uniform and clear illumination light at the edge portion can be obtained. .

  (2) In addition, the gap 3b provided at the joint of the convex lens 3a of the incident side lens array 3A is substantially equal to the gap formed at the connecting part 2A between the parallel lights on the incident side or the width of the extreme light quantity reduction part. The width is formed. Therefore, since the convex lens 3a is not formed in the portion where the illuminance is lowered, the luminance unevenness can be efficiently reduced.

  (3) The light source unit 1 includes two divided light source units 11 and 12 disposed so as to face each other with the optical path changing member 2 interposed therebetween, so that light from each of the divided light source units 11 and 12 does not overlap alternately. Since the light is incident on the integrator lens 3, even if one of the divided light source units 11 and 12 is cut off, the occurrence of extreme luminance unevenness is suppressed. In addition, by increasing the number of light source units, the power consumption of each light source unit can be reduced and the life of the light source can be extended.

  (4) Each of the two divided light source units 11 and 12 includes light source lamps 11c and 12c including parabolic concave mirrors 11b and 12b that emit light emitted from the light emitting units 11a and 12a in substantially parallel directions. Has been. Therefore, a general-purpose light source can be obtained by using a general-purpose light source.

  (5) The optical path changing member 2 is formed in a mountain shape in which one split reflecting mirror 21a to 21c, 22a to 22c for each of the two split light source portions 11 and 12 is combined, and the edges of each are combined. A plurality of combination products formed in the above are distributed and arranged. Therefore, the optical path changing member 2 that disperses the light from the divided light source units 11 and 12 and irradiates the irradiation surface can be easily formed.

  (6) Since the integrator lens 3 is configured to prevent light from passing through the gap 3b provided at the joint portion of the convex lens 3a of the incident side lens array 3A, the gap 3b is configured by a light shielding member. A portion of the edge portion of the parallel light from the changing member 2 with a small amount of light is cut off without being incident on the convex lens 3a of the incident side lens array 3A. Therefore, the luminance unevenness of the illumination light from the integrator lens 3 can be reduced.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIG. In the second embodiment, a light converging member 3c is provided in the incident side lens array 3A as a configuration in which light does not pass through the gap 3b provided in the joint portion of the convex lens 3a of the incident side lens array 3A in the integrator lens 3. It is a thing. Other configurations are the same as those in the first embodiment.

  The light converging member 3c is formed between the convex lens 3a and the substrate portion 3d that supports the convex lens 3a, and has a function of collecting the low light amount light R guided to the gap 3b in the convex lens 3a. is there.

  The low light quantity light R guided in the direction of the gap 3b is shielded in the first embodiment, but is superimposed through the convex lens 3a in the second embodiment. Therefore, the illuminance of the illumination light from this illumination device can be improved accordingly.

(Embodiment 3)
The third embodiment is another example of the illumination device, in which the configuration of each of the divided light source units 11 and 12 and the configuration of the optical path changing member 2 in the first embodiment are changed. Hereinafter, this embodiment will be described with reference to FIG.

  As in the case of the first embodiment, the illumination device according to this embodiment includes a light source unit 30 composed of two divided light source units 30A and 30B arranged opposite to each other, and a space between these two divided light source units 30A and 30B. The optical path changing member 40 is disposed. This configuration corresponds to the configuration of the portion composed of the divided light source units 11 and 12 and the optical path changing member 2 in the first embodiment.

  In addition, as shown in FIG. 4, the divided light source units 30 </ b> A and 30 </ b> B according to the present embodiment alternately and parallelly emit two light source lamps 31 and 32 and parallel light from the two light source lamps 31 and 32. It is composed of a light combining member 33 that composes one light source unit by being combined so as to be reflected toward the optical path changing member 40 so as not to overlap. In this configuration, the configuration of the portion composed of the divided light source units 11 and 12 and the optical path changing member 2 in the first embodiment is directly used as the configuration of the divided light source units 30A and 30B.

  More specifically, the light source lamps 31 and 32 are exactly the same as the light source lamps 11c and 12c in the first embodiment. In addition, the light combining member 33 has two reflecting mirrors 34 and 35 for the light source lamps 31 and 32 arranged to face each other, and each of the reflecting mirrors 34 and 35 includes three divided reflecting mirrors. 34a-34c, 35a-35c. Then, the reflection mirrors 34 and 35 are formed in a mountain shape by combining the edges of each of the divisional reflection mirrors, and the combination product of the three pairs of mountain-shaped divisional reflection mirrors combined in this way is two light sources. The lamps 31 and 32 are arranged in a distributed manner. Further, the light combining member 33 is configured and arranged in this manner, so that the parallel light from the two light source lamps 31 and 32 facing each other is divided, and the divided parallel light is directed to the optical path changing member 40. The parallel light from the two light source lamps is reflected toward the optical path changing member 40 so as not to overlap with each other. Therefore, the light combining member 33 is exactly the same in structure and function as the optical path changing member 2 in the first embodiment.

  In addition, the optical path changing member 40 has two split light sources 41 and 42 for the split light source units 30A and 30B arranged opposite to each other, and the reflective mirrors 41 and 42 each have three split reflections. It has mirrors 41a to 41c and 42a to 42c. The reflecting mirrors 41 and 42 are each formed of one split reflecting mirror so as to form two adjacent surfaces of the triangular prism member, and 45 degrees with the optical axis from the two split light source units 30A and 30B. It is configured to make. The three triangular prism members formed in this way are distributed between the two divided light source units 30A and 30B. Since the optical path changing member 40 is configured and arranged in this manner, the divided parallel lights from the two divided light source units 30A and 30B are alternately supplied in the same manner as the optical path changing member 2 in the first embodiment. Further, the light is reflected toward the incident surface of the incident side lens array 3A in the integrator lens 3 so as not to overlap.

Since the illuminating device according to Embodiment 3 is configured as described above, the same effects as those of Embodiment 1 can be achieved, and the following effects can be achieved.
(1) Each of the two divided light source units 30A and 30B includes a plurality of light source lamps 31 and 32 each having a parabolic concave mirror that emits light emitted from the light emitting unit in a substantially parallel manner. The light combining member 33 is configured to combine light emitted from the lamps 31 and 32. For this reason, compared with the case of Embodiment 1, the capacity | capacitance of the lamp for light sources can be further reduced and the lifetime of the lamp for light sources can be measured.

  (2) Further, the optical path changing member 40 is formed by forming one split reflection mirror for each of the two split light source portions 30A and 30B so as to form two adjacent surfaces of the triangular prism member. Since it has a structure in which the individual triangular prism members are arranged in a distributed manner, the production of the optical path changing member 40 can be further simplified and the assembly is facilitated.

(Embodiment 4)
The fourth embodiment is a three-plate liquid crystal projector as a projection video display device using the illumination device described in the first embodiment. In this liquid crystal projector, as shown in FIG. 5, the light emitted from the illumination device including the light source unit 1, the optical path changing member 2, and the integrator lens 3 is converted into a single polarized light through the polarization conversion device 4. Thereafter, the light passes through the condenser lens 5 and is guided to the first dichroic mirror 6A. As shown in this figure, the integrator lens 3 has an exit side lens array 3B having the same structure as the entrance side lens array 3A.

  The first dichroic mirror 6A is configured to transmit light in the red wavelength band and reflect light in the cyan (green + blue) wavelength band. The light in the red wavelength band that has passed through the first dichroic mirror 6A is reflected by the total reflection mirror 7A, guided to a transmissive liquid crystal panel 8A as a light valve for red light, and is transmitted therethrough for light modulation. Is done. On the other hand, the light in the cyan wavelength band reflected by the first dichroic mirror 6A is guided to the second dichroic mirror 6B.

  The second dichroic mirror 6B is configured to transmit light in the blue wavelength band and reflect light in the green wavelength band. The light in the green wavelength band reflected by the second dichroic mirror 6B is guided to a transmissive liquid crystal panel 8B serving as a light valve for green light, and is transmitted therethrough to be modulated. The light in the blue wavelength band that has passed through the second dichroic mirror 6B is guided to the transmissive liquid crystal panel 8C as a light valve for blue light through the total reflection mirrors 7B and 7C, and is transmitted therethrough. Modulated.

  The modulated light (each color video light) obtained through the liquid crystal panels 8A, 8B, and 8C as light valves is synthesized by the dichroic prism 9 to become color video light. The color image light is enlarged and projected by the projection lens 10 and projected and displayed on a screen (not shown).

Since the three-plate liquid crystal projector according to Embodiment 4 is configured as described above, the following effects can be obtained.
(1) The illumination light from the illuminating device forms a sharp edge on the liquid crystal panels 8A, 8B, and 8C as light valves, so that the light from the convex lens 3a of the incident side lens array 3A in the integrator lens 3 is superimposed. It becomes easy to do. Accordingly, a color image with less luminance unevenness can be obtained.

  (2) The liquid crystal projector according to this embodiment is configured to disperse the light from the two divided light source units 11 and 12 and irradiate the incident side lens array 3A in the integrator lens 3, so that one Even if the light source part is cut off, the light from other light source parts can be dispersed and applied to the incident side lens array 3A in the integrator lens 3. For this reason, it is possible to perform projection while suppressing luminance unevenness to an inconspicuous level.

(Modification)
The above embodiment can be modified as follows.
In the first embodiment, the number of divided light source units may be one. In this case, the optical path changing member 2 may be composed of a plurality of reflection mirrors, and the parallel lights reflected by the respective reflection mirrors may be combined so as to be continuous. Further, although one example of the light source lamps constituting the split light source unit is shown in the first embodiment and two examples in the second embodiment, the number of other lamps may be three or more.

  In the first embodiment, the optical path changing member 2 may be changed to a configuration like the optical path changing member 40 in the third embodiment. The number of split reflection mirrors in the optical path changing member 2 may be a plurality of other numbers.

-In Embodiment 3, you may change the photosynthesis member 33 into the structure which consists of triangular prism members like the optical path change member 40. FIG.
In the third embodiment, each of the reflection mirrors 34 and 35 constituting the light combining member 33 may be one reflection mirror, or may be changed so as to have another number. In addition, when changing the reflective mirrors 34 and 35 to another plurality, it is preferable to match the number of the divisional reflective mirrors constituting the optical path changing member 40 in order to prevent luminance unevenness in the irradiation light.

-In Embodiment 3 and Embodiment 4, you may comprise the structure which does not let light pass through the clearance gap in the junction part of the convex lens of the integrator lens 3 like Embodiment 2. FIG.
In Embodiment 4, the exit side lens array 3B of the integrator lens 3 is the same as the entrance side lens array 3A. However, with respect to the exit side lens array 3B, a gap is formed in the joint portion of the convex lens. There is no need to provide it. However, if the same lens array as the incident side lens array 3A is used, the cost can be reduced by sharing parts. This also applies to the integrator lens 3 according to the first to third embodiments.

  In the fourth embodiment, the projection display apparatus according to the present invention is a three-plate type liquid crystal projector that synthesizes each color image light by the dichroic prism 9, but may also synthesize each color image light by a dichroic mirror. . Further, the liquid crystal projector is not limited to a three-plate liquid crystal projector, and may be a single-plate liquid crystal projector. Furthermore, it is good also as a structure using light valves other than a liquid crystal panel.

  The illumination device according to the present invention can be widely used such as a projection display apparatus. The projection display apparatus according to the present invention can be used as an image display system in various facilities such as a home theater, a conference room, a training room, a classroom, an amusement hall, various exhibition rooms, and a studio.

It is explanatory drawing of the illuminating device which concerns on Embodiment 1 of this invention. It is a schematic diagram of the optical path from the integrator lens to a light valve in the illumination device. It is explanatory drawing of the integrator lens in the illuminating device which concerns on Embodiment 2 of this invention. It is explanatory drawing of the illuminating device which concerns on Embodiment 3 of this invention. It is explanatory drawing of the projection type video display apparatus concerning Embodiment 4 of this invention. It is a principle explanatory view of an integrator lens. It is an example of the conventional illuminating device. It is a schematic diagram of the optical path from the integrator lens in a conventional illuminating device to a light valve.

Explanation of symbols

  R ... low light quantity, 1,30 ... light source part, 2,40 ... optical path changing member, 2A ... connecting part (between parallel lights), 3 ... integrator lens, 3A ... incident side lens array, 3B ... outgoing side lens array 3a ... convex lens, 3b ... gap (at the convex lens joint), 3c ... light converging member, 8 ... light valve, 10 ... projection lens, 11, 12, 30A, 30B ... split light source part, 11a, 12a ... light emitting part, 11b, 12b ... Parabolic concave mirror, 11c, 12c, 31, 32 ... Lamp for light source 21, 22, 34, 35, 41, 42 ... Reflecting mirror, 21a-21c, 22a-22c, 34a-34c, 35a-35c , 41a to 41c, 42a to 42c, split reflection mirrors, 33, photosynthetic member.

Claims (11)

A light source unit that emits substantially parallel light, an integrator lens having an incident-side lens array and an output-side lens array composed of a plurality of convex lenses, and a parallel light from the light source unit is divided and directed toward the light incident surface of the incident-side lens array. In an illuminating device comprising an optical path changing member composed of a split reflection mirror configured to reflect in a parallel light state,
The integrator lens is formed so that the joint portion of the convex lens of the incident side lens array and the joint portion between the divided parallel lights coincide with each other in the optical axis direction, and a gap is provided in the joint portion of the convex lens, Furthermore, it is comprised so that light may not pass through this clearance gap, The illuminating device characterized by the above-mentioned. Gaps provided in the joint portion of the convex lens of the incident side lens array in the integrator lens, according to claim 1, characterized in that said formed in gap between the substantially equal width formed on the connecting part between the parallel light The lighting device described. The light source unit is composed of two divided light source units arranged to face each other with the optical path changing member interposed therebetween,
The optical path changing member is composed of reflection mirrors for two divided light source units, and these reflection mirrors have a plurality of divided reflection mirrors and do not overlap light from the two divided light source units alternately by these divided reflection mirrors. The illumination device according to claim 1, wherein the illumination device is configured to be guided onto the integrator lens.   4. The illumination according to claim 3, wherein each of the two divided light source units includes a light source lamp including a parabolic concave mirror that emits light emitted from the light emitting unit in a substantially parallel manner. 5. apparatus.   Each of the two divided light source units includes a plurality of light source lamps each including a parabolic concave mirror that emits light emitted from the light emitting unit in a substantially parallel manner, and light emitted from the plurality of light source lamps. The lighting device according to claim 3, wherein the lighting device is composed of a light combining member that combines the light.   The optical path changing member is formed by combining one split reflection mirror for each of the two split light source units, forming a mountain shape with the edges of each other, and a plurality of combination products formed in the mountain shape are dispersedly arranged. The lighting device according to any one of claims 3 to 5, wherein:   Further, the optical path changing member is formed by forming one split reflecting mirror for each of the two split light source sections so as to form two adjacent surfaces of the triangular prism member, and a plurality of triangular prism members thus formed are dispersedly arranged. The lighting device according to claim 3, wherein the lighting device is a light source.   8. The integrator lens according to claim 1, wherein the integrator lens is configured to prevent light from passing through a gap provided at a joint portion of the convex lens of the incident side lens array, and the gap is constituted by a light shielding member. The lighting device according to any one of the above.   The integrator lens is configured to prevent light from passing through a gap provided at a joint portion of the convex lens of the incident side lens array, and a light converging member that collects the low light amount light guided in the direction of the gap on the convex lens. It has in front of an incident side, The illuminating device of any one of Claims 1-8 characterized by the above-mentioned.   The illumination device according to any one of claims 1 to 9, a light valve that modulates light emitted from the illumination device based on a video signal, and projection that magnifies and projects the light modulated by the light valve A projection-type image display device comprising a lens.   11. The projection display apparatus according to claim 10, wherein the light from the illumination device is separated into the three primary colors and led to the light valves for each color light, and the light modulated by the light valves for each color light is synthesized and projected. A projection-type image display device, characterized by being configured to do so.

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