JP2007256422A - Illuminating apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dual-lamp illuminating apparatus which can be used suitably for a high-luminance projector, can suppress in-plane light intensity distribution in an illuminated area from becoming uneven even when emitted light from a light emitting tube is weakened or stopped in any of a plurality of light source devices, and can suppress the quality of a projected image from being deteriorated. <P>SOLUTION: The illuminating apparatus 100 includes: a polarization beam combiner 90; a first polarized light source device 40; a second polarized light source device 80; and an integrator optical system 120. The first polarized light source device 40 and the second polarized light source device 80 include light source devices 10 and 50, polarized light separation optical elements 20 and 60, and λ/2 plates 30 and 70. The polarization beam combiner 90 synthesizes illuminating light flux related to a P-polarized light component emitted from the first polarized light source device 40 and illuminating light flux related to an S-polarized light component emitted from the second polarized light source device 80 to emit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device and a projector.

Conventionally, projectors with high brightness have been demanded, and projectors having a configuration for combining light from two light source devices with a triangular prism (so-called two-lamp projector) have been proposed (for example, so as to meet the demand) (for example, , See Patent Document 1).

According to such a conventional two-lamp type projector, since an illumination device having two light source devices is used as the illumination device, a projector with higher brightness than the conventional one can be configured.

Japanese Patent Laid-Open No. 2002-72083 (FIG. 4)

However, in such a conventional two-lamp type projector, if the light emission of the arc tube is weakened or cut off in any one of the two light source devices, the in-plane light intensity distribution in the illuminated area is not uniform. As a result, there is a problem that the quality of the projected image deteriorates. This problem is not a problem that can be seen only in a two-lamp type projector, but is a problem that is commonly seen in a projector having three or more sets of light source devices.

Accordingly, the present invention has been made to solve such a problem, and is an illumination device that can be suitably used for a high-intensity projector. In any of the plurality of light source devices, the arc tube is used. Even if the emission of the light is weakened or cut off, it is possible to suppress the in-plane light intensity distribution in the illuminated area from becoming uneven and to suppress the deterioration of the quality of the projected image. An object is to provide a lighting device. The present invention also provides:
It is an object of the present invention to provide a projector provided with such an illumination device.

In order to achieve the above object, the present inventor, in the conventional two-lamp projector, when the light emission of the arc tube is weakened or cut off in one of the two light source devices, the in-plane light in the illuminated region The cause of uneven intensity distribution was thoroughly investigated. As a result, because the illumination light beams from the two light source devices are synthesized by the triangular prism at a predetermined angle, the illumination light beams from the two light source devices are superimposed in the same illumination range in the illuminated area. However, it was found to be caused by the fact that they were not superimposed at the same angle. Based on this knowledge, the present inventor has conceived that the above problem can be solved by superimposing the illumination light beams from the two light source devices at the same angle, and has completed the present invention.

That is, the illuminating device of the present invention includes a polarization beam combiner having a first light incident surface and a second light incident surface, and an illumination light beam related to the first polarization component, disposed on the first light incident surface. A first polarized light source device that emits light, and an illumination light beam related to a second polarization component that is disposed on the second light incident surface and has a polarization axis different from that of the illumination light beam related to the first polarization component The second polarized light source device, and an integrator optical system having a function of converting the illumination light beam from the polarized beam combiner into light having a more uniform intensity distribution, wherein the first polarized light source device is substantially parallel. A first light source device that emits a simple illumination light beam, and a first light source device that transmits the illumination light beam related to the first polarization component and reflects the illumination light beam related to the second polarization component among the illumination light beams from the first light source device. 1 polarization separation plane and the first polarization A first reflecting surface that reflects the illumination light beam related to the second polarization component reflected by the separation surface in a direction parallel to the illumination light beam related to the first polarization component that has passed through the first polarization separation surface; A first polarization separation optical element having the first polarization separation optical element and a position where the illumination light beam related to the second polarization component emitted from the first polarization separation optical element passes, and the illumination light beam related to the second polarization component is A first retardation plate for converting the illumination light beam from the first light source device into an illumination light beam according to the first polarization component. The second polarized light source device emits a substantially parallel illumination light beam, and the second light source device emits a first light beam out of the second light source device. Illumination light beam which permeate | transmits the illumination light beam which concerns on a polarization component, and concerns on a 2nd polarization component The illumination light beam related to the second polarization component reflected from the second polarization separation surface and the second polarization component reflected by the second polarization separation surface is converted into the illumination light beam related to the first polarization component transmitted through the second polarization separation surface. A second polarization separation optical element having a second reflection surface that reflects in a parallel direction, and a position where an illumination light beam related to the first polarization component emitted from the second polarization separation optical element passes. And a second retardation plate that converts the illumination light beam related to the first polarization component into the illumination light beam related to the second polarization component, and the illumination light beam from the second light source device is The illumination light beam related to the polarization component is emitted toward the second light incident surface of the polarization beam combiner, and the polarization beam combiner transmits the illumination light beam related to the first polarization component transmitted through the first polarization separation surface. And second polarized light reflected by the second polarization separation surface The illumination light beam related to the component is combined, and the illumination light beam related to the first polarization component which has been reflected by the first retardation plate and converted by the first retardation plate is then combined with the second polarization light. After passing through the separation surface, the illumination light beam related to the second polarization component that has been polarization-converted by the second retardation plate is combined and emitted toward the integrator optical system.

For this reason, according to the illumination device of the present invention, linearly polarized light having different polarization axes is emitted from the first polarized light source device and the second polarized light source device, and these linearly polarized light is emitted from the first polarized light beam combiner in the first polarization beam combiner. By making the light incident surface and the second light incident surface respectively enter, the illumination light beams from the two light source devices (the first light source device and the second light source device) are superimposed at the same angle from the polarization beam combiner. It comes to be injected in the form. For this reason, even if the light emission of the arc tube is weakened or cut off in any one of the two light source devices, it is possible to suppress the in-plane light intensity distribution in the illuminated region from becoming uneven. In addition, it is possible to provide an illuminating device that can suppress the deterioration of the quality of the projected image.

By the way, the polarization separation optical element can separate the illumination light beam incident on the polarization separation surface into the illumination light beam related to the first polarization component and the illumination light beam related to the second polarization component at a ratio of 1: 1. Although desirable, there may be deviations in polarization separation due to manufacturing variations. In the polarization separation optical element in which the polarization separation is biased, when the light intensity of the illumination light beam incident on the polarization separation surface is 100, for example, the light of the illumination light beam related to the first polarization component transmitted through the polarization separation surface The intensity is 52, and the light intensity of the illumination light beam related to the second polarization component reflected by the polarization separation surface may be 48.

According to the illumination device of the present invention, the illumination light beam that has passed through the first polarization separation surface of the first polarization separation optical element, and the illumination light beam that has been reflected by the second polarization separation surface of the second polarization separation optical element, So that the illumination light beam reflected by the first polarization separation surface of the first polarization separation optical element and the illumination light beam transmitted through the second polarization separation surface of the second polarization separation optical element are synthesized. In addition, since the first polarization separation optical element and the second polarization separation optical element are respectively disposed, even if a polarization separation optical element having a bias in polarization separation is used, the polarization separation surface is transmitted. The difference between the light intensity of the illumination light beam and the light intensity of the illumination light beam reflected by the polarization separation surface can be canceled out. For this reason, it can suppress that a light quantity difference arises in the illumination light beam inject | emitted from a polarization beam combiner, and it becomes possible to suppress generation | occurrence | production of illumination nonuniformity.

Note that by using two or more sets of the polarized light source devices of the present invention, not only a two-lamp type projector having two light source devices but also a multi-lamp type projector having a plurality of light source devices can be configured.

In the illumination device of the present invention, it is preferable that the first polarization separation optical element and the second polarization separation optical element include polarization separation optical elements manufactured in the same lot.

With this configuration, (a) the ratio of the light intensity of the P-polarized component transmitted through the first polarization separation surface and the light intensity of the S-polarization component reflected by the first polarization separation surface is And the ratio of the light intensity of the P-polarized component that is transmitted through the polarization separation surface and the light intensity of the S-polarized component that is reflected by the second polarization separation surface, and (b) is transmitted through the first polarization separation surface. The light intensity of the P-polarized light component is the same as the light intensity of the P-polarized light component transmitted through the second polarization separation surface, and (c) the light of the S-polarized light component reflected by the first polarization separation surface. Since the magnitude of the intensity is the same as the magnitude of the light intensity of the S-polarized light component reflected by the second polarization separation surface, the polarization separation bias and the second polarization in the illumination light beam from the first polarized light source device The polarization beam combiner cancels the polarization separation bias in the illumination beam from the light source device. It becomes a. For this reason, it can further suppress that a light quantity difference arises in the illumination light beam inject | emitted from a polarization beam combiner, and it becomes possible to further suppress generation | occurrence | production of illumination nonuniformity.

In the illuminating device of the present invention, the first retardation plate and the second retardation plate are composed of one retardation plate, and the retardation plate is the first light incident on the polarization beam combiner. It is preferable to adhere across the surface and the second light incident surface.

  With such a configuration, the manufacturing cost can be reduced.

In the illumination device of the present invention, the first light source device includes a first ellipsoidal reflector, a first arc tube having a light emission center in the vicinity of a first focal point of the first ellipsoidal reflector, and the first 1
A first concave lens that emits focused light from the ellipsoidal reflector toward a position corresponding to the first polarization separation surface on the light incident surface of the first polarization separation optical element, and the second concave lens. The light source device includes a second ellipsoidal reflector, a second arc tube having a light emission center near the first focal point of the second ellipsoidal reflector, and the focused light from the second ellipsoidal reflector. Second
And a second concave lens that emits toward a position corresponding to the second polarization separation surface on the light incident surface of the polarization separation optical element.

With this configuration, the first light source device and the second light source device emit a substantially parallel light beam that is smaller than the size of the ellipsoidal reflector, so that the projector can be reduced in size. .

In the illuminating device of the present invention, the first arc tube reflects the light emitted from the first arc tube toward the illuminated area toward the first arc tube. The second arc tube is provided with second reflecting means for reflecting the light emitted from the second arc tube toward the illuminated area toward the second arc tube. Preferably it is.

With this configuration, since the light emitted from the arc tube toward the illuminated area is reflected toward the arc tube, each elliptical surface has a size that covers the illuminated area side end of the arc tube. It is not necessary to set the size of the reflector, and each ellipsoidal reflector can be miniaturized. As a result, the projector can be miniaturized.
In addition, since the size of each ellipsoidal reflector can be reduced, the focusing angle and beam spot of the beam focused from the ellipsoidal reflector toward the second focal point of the ellipsoidal reflector can be reduced. The size, the size of each polarization separation optical element, and the size of the polarization beam combiner can be further reduced, and the lighting device can be further miniaturized.

In the illuminating device of the present invention, the first light incident surface of the polarization beam combiner and the light exit surface of the first polarized light source device are bonded together, and the second light incident surface of the polarization beam combiner. It is preferable that the light exit surface of the second polarized light source device is bonded.

In the illumination device of the present invention, the light incident surface of the first polarization separation optical element and the light exit surface of the first concave lens in the first light source device are bonded to each other, and the second polarization separation optical It is preferable that the light incident surface of the element is bonded to the light emitting surface of the second concave lens in the second light source device.

With this configuration, unnecessary reflection between the components is reduced, so that the light utilization efficiency is improved and the stray light level is reduced.

In the illumination device of the present invention, the polarization beam combiner and the first polarization separation optical element, the first polarization separation optical element and the first concave lens, the polarization beam combiner and the second polarization separation optical element. , And the second polarization separation optical element and the second concave lens,
It is also preferable that they are arranged apart from each other.

When configured in this manner, the position adjustment between the optical elements can be easily performed. Further, the thermal influence on each optical element can be reduced.

In this case, the first light incident surface and the second light incident surface of the polarization beam combiner, the light incident surface and the light exit surface of the first polarization separation optical element, and the light incident surface and the light of the second polarization separation optical element. Exit surface,
The light incident surface and the light exit surface of the first concave lens and the light incident surface and the light exit surface of the second concave lens are preferably coated with a anti-reflection film.

Thereby, generation | occurrence | production of the unnecessary reflection in the illumination light beam which injects into each said optical element, and the illumination light beam inject | emitted from each said optical element can be suppressed.

In the illumination device of the present invention, the integrator optical system includes a condenser lens that converts the illumination light beam from the polarization beam combiner into a focused light and emits the light, and a more uniform intensity distribution of the illumination light beam from the condenser lens. It is preferable to have an integrator rod that converts light into light.

With this configuration, the in-plane light intensity distribution of the illumination light beam can be made more uniform by the function of the integrator rod.

In the illumination device of the present invention, the integrator rod may be a hollow integrator rod or a solid integrator rod.

As the hollow integrator rod, for example, a cylindrical light tunnel in which the reflecting surfaces of four reflecting mirrors are bonded inward can be suitably used. In addition, as the solid integrator rod, for example, a solid rod member (glass rod) of an internal total reflection type can be suitably used.

In the illuminating device of the present invention, the integrator optical system is disposed on the light incident surface of the integrator rod, and is disposed on the light emitting surface of the integrator rod, and a reflective layer having an opening for light incidence at a central portion. It is preferable to further include a λ / 4 plate and a reflective polarizing plate disposed on the light exit side of the λ / 4 plate.

With this configuration, when the illumination light beam related to one polarization component of the illumination light beam incident on the integrator rod passes through the reflection side polarizing plate, the illumination light beam related to the other polarization component is reflected to the reflection type polarizing plate. It is reflected by. This reflected light is reflected by the reflective layer disposed on the light incident surface of the integrator rod and reaches the reflective polarizing plate again. At this time, since this light has already passed through the λ / 4 plate twice, the polarization direction is rotated by 90 degrees, and passes through the reflective polarizing plate as an illumination light beam related to one polarization component. That is, it becomes possible to align the polarization direction of the light emitted from the integrator rod with approximately one type of polarization direction. Therefore, it is particularly suitable for a projector using an electro-optic modulation device that controls the polarization direction, such as a liquid crystal device.

In the illumination device of the present invention, the integrator optical system is disposed on the light incident side of the integrator rod, and converts the illumination light beam from the condenser lens into a light beam having substantially one type of linearly polarized light component. It is preferable to further have.

This configuration also makes it possible to align the polarization direction of the light incident on the integrator rod with approximately one type of polarization direction. Therefore, an electro-optic modulation device that controls the polarization direction like a liquid crystal device is used. This is particularly suitable for a conventional projector.

In the illuminating device of this invention, it is preferable that the said integrator rod and the said polarization conversion element are adhere | attached.

With this configuration, undesirable multiple reflections between the polarization conversion element and the integrator rod are suppressed, and the light use efficiency does not decrease and the stray light level does not increase. In addition, the polarization conversion element and the integrator rod can be easily integrated. In addition, it is possible to prevent the occurrence of misalignment between the polarization conversion element and the integrator rod after the device is assembled.

In this case, it is preferable to use an adhesive having substantially the same refractive index as that of the polarization conversion element and the integrator rod.

In the illumination device of the present invention, the integrator optical system includes two first lens arrays each having a plurality of first small lenses that divide an illumination light beam from the polarization beam combiner into a plurality of partial light beams, and the two Two second lens arrays each having a plurality of second small lenses corresponding to the first small lenses of the first lens array, and each partial light beam from the two second lens arrays is substantially one type of linearly polarized light. Two polarization conversion elements for converting into light beams having components, and a superimposing lens for superimposing respective light from the two polarization conversion elements in an illuminated area, the two first lens arrays, the two Second lens array and 2
Each of the two polarization conversion elements is preferably arranged symmetrically with respect to a virtual plane including the optical axis of the superimposing lens.

With this configuration, the in-plane light intensity distribution of the illumination light beam can be made more uniform by the action of the two first lens arrays, the two second lens arrays, and the superimposing lens. In addition, since the polarization direction of the illumination light beam can be aligned with substantially one polarization direction by the action of the two polarization conversion elements, a projector using an electro-optic modulation device that controls the polarization direction like a liquid crystal device. Is particularly suitable.

In addition, according to the illumination device of the present invention, since the first lens array, the second lens array, and the two polarization conversion elements are respectively disposed in the downstream of the optical path of the polarization beam combiner, the polarization beam combiner is provided. The size of each of the first lens array, the second lens array, and the polarization conversion element is compared with that having a configuration in which one each of the first lens array, the second lens array, and the polarization conversion element is disposed in the subsequent stage of the optical path. There is also an effect that the first lens array, the second lens array, and the polarization conversion element can be easily manufactured.

The projector of the present invention includes the illumination device of the present invention, an electro-optic modulation device that modulates light from the illumination device according to image information, and a projection optical system that projects light modulated by the electro-optic modulation device. It is characterized by providing.

For this reason, according to the projector of the present invention, since the above-described excellent illumination device of the present invention is provided, the projector has a high brightness, and the arc tube in any one of the plurality of light source devices. Even if the light emission is weakened or cut off, the projector can suppress the deterioration of the quality of the projected image.

Hereinafter, an illumination device and a projector according to the present invention will be described based on embodiments shown in the drawings.

[Embodiment 1]
FIG. 1 is a diagram for explaining an illumination device 100 and a projector 1000 according to the first embodiment. FIG. 1A is a plan view showing an optical system of the projector 1000, and FIG.
FIG. 1B is a side view showing the optical system of the projector 1000, FIG. 1C is a view of the first concave lens 18 viewed from the first arc tube 12 side, and FIG. It is the figure which looked at the concave lens 58 from the 2nd arc tube 52 side. FIG. 2 is a diagram for explaining a main part of the lighting apparatus 100 according to the first embodiment. FIG. 3 is a diagram schematically showing how the illumination light beams emitted from the first light source device 10 and the second light source device 50 are polarized and separated.

FIG. 4 is a front view of the first lens arrays 130 and 134. In FIG. 4, the outline L of the illumination light beam is also shown. FIG. 5 is a diagram showing light rays in the integrator optical system 120. FIG. 6 is a diagram showing in-plane light intensity distributions on the light exit surfaces of the polarization conversion elements 150 and 155. FIG. 7 is a view for explaining the illumination state when the light emission of the first arc tube 12 of the first light source device 10 is cut off. FIG. 8 is a view for explaining an illumination state when light emission of the second arc tube 52 of the second light source device 50 is cut off.

In the following description, three directions orthogonal to each other are respectively expressed in the z-axis direction (FIG. 1 (
system optical axis OC direction in a), x-axis direction (parallel to the paper surface in FIG. 1A and z)
A direction perpendicular to the axis) and a y-axis direction (a direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis).

As shown in FIG. 1, the projector 1000 according to the first embodiment includes a so-called two-lamp illumination device 100 and color separation that separates an illumination light beam from the illumination device 100 into three color lights and guides them to an illuminated area. Three liquid crystal devices 400R, 4 as electro-optic modulation devices that modulate the light guide optical system 200 and each of the three color lights separated by the color separation light guide optical system 200 according to image information.
00G, 400B, a cross dichroic prism 500 that combines color lights modulated by the liquid crystal devices 400R, 400G, 400B, and a cross dichroic prism 500
And a projection optical system 600 that projects the light synthesized by the projection onto a projection surface such as a screen SCR.

As shown in FIGS. 1, 2, and 5, the illumination device 100 according to the first embodiment includes a first polarized light source device 40, a second polarized light source device 80, a first polarized light source device 40, and a first polarized light source device 40. A polarization beam combiner 90 that combines and emits the illumination light beams emitted from the two polarized light source devices 80, and an integrator optical system that has a function of converting the illumination light beams from the polarization beam combiner 90 into light having a more uniform intensity distribution 120 is a lighting device.

First, the first polarized light source device 40, the second polarized light source device 80, and the polarized beam combiner 9 are used.
The configuration of 0 will be described.

As shown in FIGS. 1 to 3, the first polarized light source device 40 includes a first light source device 10 that emits a substantially parallel illumination light beam, and an illumination light beam from the first light source device 10 as a P-polarized component ( A first polarization separation optical element 20 that separates the illumination light beam according to the first polarization component) and the illumination light beam according to the S polarization component (second polarization component); And a first λ / 2 plate 30 serving as a first retardation plate disposed at a position where an illumination light beam related to the S-polarized light component passes.

The first light source device 10 includes a first ellipsoidal reflector 14 and a first ellipsoidal reflector 14.
The first light-emitting tube 12 having an emission center in the vicinity of the first focal point and the first polarized light separating surface 22 on the light incident surface of the first polarized light separating optical element 20 for focusing light from the first ellipsoidal reflector 14. And a first concave lens 18 that emits toward a position corresponding to. The first arc tube 12 includes a first auxiliary mirror 16 as a first reflecting means for reflecting light emitted from the first arc tube 12 toward the illuminated region toward the first arc tube 12. Is provided. First light source device 10
Emits a light beam having the optical axis 10ax as the central axis.

The first arc tube 12 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion.
The first ellipsoidal reflector 14 has a cylindrical neck-like portion inserted into and fixed to one sealing portion of the first arc tube 12, and light emitted from the first arc tube 12 as a second focal point. And a reflective concave surface that reflects toward the position.

The first auxiliary mirror 16 is provided to face the first ellipsoidal reflector 14 across the tube portion of the first arc tube 12, and the first auxiliary mirror 16 is the first of the light emitted from the first arc tube 12. The light not directed to the ellipsoidal reflector 14 is returned to the first arc tube 12 and is incident on the first ellipsoidal reflector 14.

The first concave lens 18 is disposed on the illuminated area side of the first ellipsoidal reflector 14. Then, the light from the first ellipsoidal reflector 14 is emitted toward the first polarization separation optical element 20.

As shown in FIGS. 2 and 3, the first polarization separation optical element 20 transmits the illumination light beam related to the P-polarized component and the illumination light beam related to the S-polarized component among the illumination light beams from the first light source device 10. The first polarization separation surface 22 that reflects in the direction away from the optical axis 10ax of the first light source device 10, and the illumination light flux related to the S polarization component reflected by the first polarization separation surface 22 is the first polarization. Separation surface 22
And a first reflecting surface 24 that reflects in the direction parallel to the illumination light beam related to the P-polarized light component that has passed through.

The first λ / 2 plate 30 passes a predetermined position on the first light incident surface 94 of the polarization beam combiner 90 described later (the illumination light beam related to the S-polarized component emitted from the first polarization separation optical element 20). Position). Then, the illumination light beam related to the S polarization component is converted into the illumination light beam related to the P polarization component.

Since the first polarized light source device 40 is configured as described above, the illumination light beam from the first light source device 10 can be emitted in alignment with the illumination light beam related to the P-polarized component.

The first polarization separation optical element 20 transmits the illumination light beam related to the S polarization component through the first polarization separation surface 22 that transmits the illumination light beam related to the P polarization component and reflects the illumination light beam related to the S polarization component. However, it is also possible to change to another first polarization separation surface that reflects the illumination light beam related to the P-polarized light component.
In this case, the first λ / 2 plate 30 is disposed at a position where the illumination light beam related to the S-polarized light component transmitted through the other first polarization separation surface passes. As described above, the first polarization light source device 40 is also used as the first polarization separation optical element having the other first polarization separation surface, and the illumination light beam from the first light source device 10 is illuminated with the P polarization component. It is possible to emit the light with the same luminous flux.

As shown in FIGS. 1 to 3, the second polarized light source device 80 includes a second light source device 50 that emits a substantially parallel illumination light beam, and an illumination light beam from the second light source device 50 as a P-polarized component ( A second polarization separation optical element 60 that separates the illumination light beam according to the first polarization component) and the illumination light beam according to the S polarization component (second polarization component); And a second λ / 2 plate 70 as a second retardation plate disposed at a position where the illumination light beam related to the P-polarized light component passes.

The second light source device 50 includes a second ellipsoidal reflector 54 and a second ellipsoidal reflector 54.
The second light-emitting tube 52 having a light emission center in the vicinity of the first focal point and the second polarized light separation surface 62 on the light incident surface of the second polarized light separation optical element 60 for focusing light from the second ellipsoidal reflector 54. And a second concave lens 58 that emits light toward a position corresponding to. The second arc tube 52 includes a second auxiliary mirror 56 as second reflecting means for reflecting the light emitted from the second arc tube 52 toward the illuminated region toward the second arc tube 52. Is provided. Second light source device 50
Emits a light beam having the optical axis 50ax as the central axis.

The second arc tube 52 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion.
The second ellipsoidal reflector 54 has a cylindrical neck-like portion inserted into and fixed to one sealing portion of the second arc tube 52 and the light emitted from the second arc tube 52 as a second focal point. And a reflective concave surface that reflects toward the position.

The second auxiliary mirror 56 is provided to face the second ellipsoidal reflector 54 with the tube portion of the second arc tube 52 interposed therebetween, and the second auxiliary mirror 56 is the second of the light emitted from the second arc tube 52. The light not directed to the ellipsoidal reflector 54 is returned to the second arc tube 52 and is incident on the second ellipsoidal reflector 54.

The second concave lens 58 is disposed on the illuminated area side of the second ellipsoidal reflector 54. The light from the second ellipsoidal reflector 54 is emitted toward the second polarization separation optical element 60.

As shown in FIGS. 2 and 3, the second polarization separation optical element 60 transmits the illumination light beam related to the P-polarized component and the illumination light beam related to the S-polarized component out of the illumination light beam from the second light source device 50. A second polarization separation surface 62 that reflects in a direction away from the optical axis 50ax of the second light source device 50, and an illumination light beam related to the S polarization component reflected by the second polarization separation surface 62 is second polarized. Separation surface 62
And a second reflecting surface 64 that reflects in a direction parallel to the illumination light flux related to the P-polarized light component that has passed therethrough.

The second λ / 2 plate 70 passes a predetermined position on the second light incident surface 96 of the polarization beam combiner 90 described later (the illumination light beam related to the P-polarized component emitted from the second polarization separation optical element 60). Position). Then, the illumination light beam related to the P-polarized component is converted into the illumination light beam related to the S-polarized component.

Since the second polarized light source device 80 is configured as described above, the illumination light beam from the second light source device 50 can be emitted in alignment with the illumination light beam related to the S polarization component.

The second polarization separation optical element 60 transmits the illumination light beam related to the S polarization component through the second polarization separation surface 62 that transmits the illumination light beam related to the P polarization component and reflects the illumination light beam related to the S polarization component. However, it is also possible to change to another second polarization separation surface that reflects the illumination light beam related to the P-polarized light component.
In this case, the second λ / 2 plate 70 is disposed at a position where the illumination light beam related to the P-polarized component reflected by the other second polarization separation surface passes. As described above, the second polarized light source device 80 also uses the second polarized light source device 80 as the second polarized light separation optical element having the second polarized light separation surface to illuminate the illumination light beam from the second light source device 50 according to the S polarization component. It is possible to emit the light with the same luminous flux.

The polarization beam combiner 90 has a substantially square shape in a plan view in which a triangular prism having a first light incident surface 94 and a triangular prism having a second light incident surface 96 are bonded together, and an interface where the triangular prisms are bonded together. Is formed with a polarization combining surface 92 that transmits the illumination light beam related to the P-polarized component and reflects the illumination light beam related to the S-polarized component. The illumination light flux related to the P-polarized component emitted from the first polarized light source device 40 and incident on the first light incident surface 94 is transmitted through the polarization combining surface 92. The illumination light beam related to the S-polarized component emitted from the second polarized light source device 80 and incident on the second light incident surface 96 is reflected by the polarization combining surface 92. Thus, the first polarized light source device 40
The illumination light beam related to the P-polarized component emitted from the light beam and the illumination light beam related to the S-polarized light component emitted from the second polarized light source device 80 are combined and emitted from the polarization beam combiner 90 toward the integrator optical system 120. The Rukoto.

In the polarization beam combiner 90, the first polarized light source device 40 and the second polarized light source device 8 are used.
The manner in which the illumination light beams emitted from 0 are combined will be specifically described. As shown in FIG. 3, the polarization beam combiner 90 includes an illumination light beam related to the P-polarized component transmitted through the first polarization separation surface 22 and an illumination light beam related to the S-polarization component reflected by the second polarization separation surface 62. Is synthesized. Further, after passing through the second polarized light separating surface 62 after passing through the second polarized light separating surface 62 and the illumination light beam relating to the P-polarized light component reflected by the first polarized light separating surface 22 and then polarized and converted by the first λ / 2 plate 30. / 2 plate 70 synthesizes the illumination light flux related to the S-polarized light component that has undergone polarization conversion. Then, the synthesized light is emitted toward the integrator optical system 120 (see FIGS. 2 and 5).

Such a polarizing beam combiner 90 has the same configuration as that of the polarizing beam splitter, but the light passing direction is opposite to that of the polarizing beam splitter, and two types of straight lines whose polarization directions are perpendicular to each other. Combines polarized light and emits apparently unpolarized light.

  Next, the configuration of the integrator optical system 120 will be described.

As shown in FIGS. 2, 4, and 5, the integrator optical system 120 includes a plurality of first small lenses 132 and 136 that divide the illumination light beam from the polarization beam combiner 90 into a plurality of partial light beams.
Two first lens arrays 130 and 134 having two, respectively, and two first lens arrays 1
A plurality of second small lenses 142, 1 corresponding to the first small lenses 132, 136 of 30, 134, respectively.
Two second lens arrays 140 and 144 having 46 respectively, and two polarization conversion elements 150 for converting the partial light beams from the two second lens arrays 140 and 144 into light beams having substantially one type of linearly polarized light component. , 155 and a superimposing lens 160 that superimposes each light from the two polarization conversion elements 150, 155 in the illuminated area.

As shown in FIG. 4, the first lens arrays 130 and 134 have a function as a light beam splitting optical element that splits light from the polarization beam combiner 90 into a plurality of partial light beams. 136 has a configuration arranged in a matrix of 6 rows and 4 columns in a plane perpendicular to the z-axis. The contour shapes of the first small lenses 132 and 136 of the first lens arrays 130 and 134 are set so as to be substantially similar to the shapes of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. In the illumination device 100 according to the first embodiment, each of the first small lenses 132 and 136 has a planar shape of “short side: long side = 3: 4 rectangle”.

The second lens arrays 140 and 144 have substantially the same configuration as the first lens arrays 130 and 134, and a plurality of second small lenses 142 and 146 are arranged in a matrix of 6 rows and 4 columns in a plane perpendicular to the z axis. It has the structure arranged in the shape. The second lens arrays 140 and 144 are the superimposing lens 1.
60 has a function of forming images of the first small lenses 132 and 136 of the first lens arrays 130 and 134 in the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B.

The polarization conversion elements 150 and 155 are polarization conversion elements that emit the polarization directions of the partial light beams divided by the first lens arrays 130 and 134 as substantially one type of linearly polarized light having the same polarization direction.

The polarization conversion element 150 transmits the light beam related to the P-polarized component (one polarization component) among the light beams emitted from the second lens array 140, and transmits the light beam related to the S-polarization component (the other polarization component) to the system optical axis OC. A polarization separation surface 151 that reflects in a direction away from the light (x-axis direction), and a light beam related to the S polarization component reflected by the polarization separation surface 151 that is parallel to the light beam related to the P polarization component that has passed through the polarization separation surface 151. The reflecting surface 152 that reflects in the direction (z-axis direction) and the light emitting surface of the polarization conversion element 150 are arranged at positions where the light beam related to the P-polarized component is emitted, and the light beam related to the P-polarized component And a λ / 2 plate 153 as a phase difference plate that converts the light beam into the luminous flux.

The polarization conversion element 155 has the same configuration as that of the polarization conversion element 150, and the second lens array 1
The light beam emitted from 44 transmits a light beam related to the P-polarized component (one polarization component) and directs the light beam related to the S-polarized component (the other polarization component) away from the system optical axis OC (x-axis direction). The reflected light is reflected in the direction (z-axis direction) parallel to the light beam related to the P-polarized component transmitted through the polarization separation surface 156. As a phase difference plate that is disposed at a position where the light beam related to the P-polarized component is emitted on the light exit surface of the reflecting surface 157 and the polarization conversion element 155 and converts the light beam related to the P-polarized component to the light beam related to the S-polarized component Λ / 2 plate 158.

The superimposing lens 160 includes first lens arrays 130 and 134 and second lens arrays 140 and 1.
The liquid crystal device 400R collects a plurality of partial light beams that have passed through 44 and the polarization conversion elements 150 and 155.
, 400G, 400B are optical elements for overlapping in the vicinity of the image forming area. The superimposing lens 160 is arranged so that the optical axis of the superimposing lens 160 and the system optical axis OC of the illumination device 100 substantially coincide. The superimposing lens 160 shown in FIGS. 1, 2 and 5 is composed of a single lens, but may be composed of a compound lens in which a plurality of lenses are combined.

The first lens array 130, the second lens array 140, and the polarization conversion element 150, and the first lens array 134, the second lens array 144, and the polarization conversion element 155, as shown in FIG. The optical axis of the lens 160 is arranged symmetrically with respect to the virtual plane.

Next, the configuration of each optical element arranged in the latter stage of the optical path from the integrator optical system 120 will be described.

As shown in FIG. 1, the color separation light guide optical system 200 includes dichroic mirrors 210 and 220.
Reflection mirrors 230, 240, 250, an incident side lens 260, and a relay lens 270.
And have. The color separation light guide optical system 200 separates the illumination light beam emitted from the superimposing lens 160 into three color lights of red light, green light, and blue light, and the three color liquid crystal devices 400R that are the illumination targets. , 400G, 400B.

The dichroic mirrors 210 and 220 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that reflects a red light component and transmits other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that reflects the green light component and transmits the blue light component.

The red light component reflected by the dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 400R for red light through the condenser lens 300R.

The condenser lens 300R is provided to convert each partial light beam from the superimposing lens 160 into a light beam substantially parallel to each principal ray. The condensing lenses 300G and 300B arranged in the preceding stage of the optical path of the other liquid crystal devices 400G and 400B are configured in the same manner as the condensing lens 300R.

Of the green light component and blue light component transmitted through the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming area of the green light liquid crystal device 400G. On the other hand, the blue light component passes through the dichroic mirror 220, and enters the incident side lens 260, the incident side reflection mirror 240, and the relay lens 270.
The liquid crystal device 40 for blue light passes through the reflection mirror 250 and the condenser lens 300B on the emission side.
It enters the 0B image forming area. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 convert the blue light component transmitted through the dichroic mirror 220 into the liquid crystal device 40.
It has a function of leading to 0B.

The reason that the incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 are provided in the optical path of blue light is that the length of the optical path of blue light is longer than the length of the optical paths of other color lights. For this reason, a decrease in light use efficiency due to light divergence or the like is prevented. The projector 1000 according to Embodiment 1 has such a configuration because the length of the optical path of blue light is long. However, the length of the optical path of red light is increased, and the incident side lens 260 and the relay lens 270 are configured. And the structure which uses the reflective mirrors 240 and 250 for the optical path of red light is also considered.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate an illumination light beam according to image information, and are illumination targets of the illumination device 100.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, incident side polarization is performed according to given image information using a polysilicon TFT as a switching element. The polarization direction of one type of linearly polarized light emitted from the plate is modulated.
In the liquid crystal devices 400R, 400G, and 400B, the image forming area is “short side: long side = 3: 4”.
A liquid crystal device having a planar shape of “rectangular” is used.

Although not shown, each condenser lens 300R, 300G, 300B and each liquid crystal device 4 are not shown.
Between the 00R, 400G, and 400B, incident-side polarizing plates are interposed, and between the liquid crystal devices 400R, 400G, and 400B and the cross dichroic prism 500,
Each of the exit side polarizing plates is interposed. These incident side polarizing plates, liquid crystal device 400R,
Light modulation of each color light incident is performed by 400G and 400B and the exit side polarizing plate.

The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the exit side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. Abbreviation X
The dielectric multilayer film formed on one of the letter-shaped interfaces reflects red light, and the dielectric multilayer film formed on the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

The color image emitted from the cross dichroic prism 500 is output from the projection optical system 600.
Is enlarged and projected to form a large screen image on the screen SCR.

According to the illuminating device 100 according to Embodiment 1 configured as described above, linearly polarized light having different polarization axes is emitted from the first polarized light source device 40 and the second polarized light source device 80, and these straight lines are emitted. The polarized light beam combiner 90 causes the two light source devices (the first light source device 10 and the second light source device 2) to enter the polarized light beam combiner 90 through the first light incident surface 94 and the second light incident surface 96, respectively. Illumination light beams from the light source device 50) are emitted in the form of being superimposed at the same angle. For this reason, as shown in FIGS.
Even if the light emission of the arc tube is weakened or cut off in any one of the two light source devices, it is possible to prevent the in-plane light intensity distribution in the illuminated area from becoming uneven and It becomes possible to suppress degradation of quality.

In addition, according to the illumination device 100 according to the first embodiment, the two first lens arrays 130 and 134, the two second lens arrays 140 and 144, and the two polarization conversion elements 150 and 155 are arranged on the downstream side of the optical path of the polarization beam combiner 90. Since each of the first lens array, the second lens array, and the polarization conversion element is arranged in the downstream of the optical path of the polarization beam combiner, The size of the first lens arrays 130 and 134, the second lens arrays 140 and 144, and the polarization conversion elements 150 and 155 can be reduced, and the first lens arrays 130 and 134, the second lens arrays 140 and 144, and the polarization conversion elements There is also an effect that manufacture of 150 and 155 becomes easy.

Moreover, the illuminating device 100 which concerns on Embodiment 1 also has the following effects.
FIG. 9 is a diagram for explaining the lighting device 100 according to the first embodiment and the lighting device 900 according to the comparative example. FIG. 9A is a diagram schematically illustrating how the illumination light beams emitted from the first light source device 10 and the second light source device 50 are polarized and separated and combined in the illumination device 900 according to the comparative example. FIG. 9B schematically shows how the illumination light beams emitted from the first light source device 10 and the second light source device 50 are polarized and separated and combined in the illumination device 100 according to the first embodiment. It is. In FIG. 9, the deviation of the amount of light (the magnitude of the amount of light) due to polarization separation is represented by the thickness of the arrow.

The illumination device 900 according to the comparative example basically has a configuration similar to that of the illumination device 100 according to the first embodiment, but the configuration of the first polarization separation optical element in the polarization beam combiner is the first embodiment. This is different from the illumination device 100 according to the above.

That is, in the illumination device 900 according to the comparative example, as shown in FIG. 9A, the first polarization separation optical element 20 (see FIG. 9B) has a first polarization separation direction different from that of the first polarization separation optical element 20 (see FIG. 9B). A polarization separation optical element 920 is used. Then, the illumination light beam transmitted through the first polarization separation surface 922 in the first polarization separation optical element 920 and the illumination light beam transmitted through the second polarization separation surface 62 in the second polarization separation optical element 60 are combined, The illumination light beam reflected by the first polarization separation surface 922 in the first polarization separation optical element 920 and the second light in the second polarization separation optical element 60.
The first polarization separation optical element 920 and the second polarization separation optical element 60 are arranged so that the illumination light beams reflected by the polarization separation surface 62 are combined.

Here, the polarization separation optical element desirably separates the illumination light beam incident on the polarization separation surface into the illumination light beam related to the P-polarized component and the illumination light beam related to the S-polarized component at a ratio of 1: 1. There are some deviations in polarization separation due to manufacturing variations.
In a polarization separation optical element in which polarization separation is biased, when the light intensity of the illumination light beam incident on the polarization separation surface is 100, for example, the light intensity of the illumination light beam related to the P-polarized component transmitted through the polarization separation surface is 52, and the light intensity of the illumination light beam related to the S-polarized component reflected by the polarization separation surface is 4
It may be 8.

The illumination device 900 according to the comparative example uses a polarization separation optical element having such a polarization separation bias.
When used as the first polarization separation optical element 920 and the second polarization separation optical element 60 in FIG. 9, as shown in FIG. 9A, a light amount difference occurs in the illumination light beam emitted from the polarization beam combiner 90. As a result, uneven lighting occurs.

On the other hand, according to the illuminating device 100 according to the first embodiment, as shown in FIG. 9B, the illumination light beam transmitted through the first polarization separation surface 22 in the first polarization separation optical element 20 and the second Are combined with the illumination light beam reflected by the second polarization separation surface 62 of the polarization separation optical element 60,
The illumination light flux reflected by the first polarization separation surface 22 in the first polarization separation optical element 20 and the second
The first polarization separation optical element 20 and the second polarization separation optical element 60 are respectively arranged so that the illumination light beam transmitted through the second polarization separation surface 62 in the polarization separation optical element 60 is combined. For this reason, even when a polarization separation optical element having a bias in polarization separation is used, the difference between the light intensity of the illumination light beam transmitted through the polarization separation surface and the light intensity of the illumination light beam reflected by the polarization separation surface Can be offset. For this reason, it can suppress that a light quantity difference arises in the illumination light beam inject | emitted from the polarization beam combiner 90. FIG. Thus, the first lens array 130
Suppressing a difference in light quantity between the illumination light beam passing through the second lens array 140 and the polarization conversion element 150 and the illumination light beam passing through the first lens array 134, the second lens array 144 and the polarization conversion element 155 (See FIG. 6), the lighting device 10
It is possible to suppress the occurrence of illumination unevenness with respect to the illumination light beam emitted from zero.

The illumination device 100 according to the first embodiment includes the polarization separation optical elements manufactured in the same lot as the first polarization separation optical element 20 and the second polarization separation optical element 60.
Accordingly, (a) the ratio between the light intensity of the P-polarized component transmitted through the first polarization separation surface 22 and the light intensity of the S-polarization component reflected by the first polarization separation surface 22 is the second polarization separation. P passing through surface 62
It is the same as the ratio between the light intensity of the polarization component and the light intensity of the S polarization component reflected by the second polarization separation surface 62, and (a) the light intensity of the P polarization component transmitted through the first polarization separation surface 22. Is the same as the light intensity of the P-polarized light component transmitted through the second polarization separation surface 62, and (c) the light intensity of the S-polarized light component reflected by the first polarization separation surface 22 Is the same as the light intensity of the S-polarized light component reflected by the second polarization separation surface 62, the polarization separation bias in the illumination light beam from the first polarization light source device 40 and the second polarization light source device The polarization separation bias in the illumination light beam from 80 is canceled by the polarization beam combiner 90. For this reason, it can further suppress that a light quantity difference arises in the illumination light beam inject | emitted from the polarization beam combiner 90, and it becomes possible to further suppress generation | occurrence | production of illumination nonuniformity.

In addition, by using two or more sets of the illumination devices 100 according to the first embodiment, not only a two-lamp projector having two light source devices but also a multi-lamp projector having four or more light source devices can be configured. become.

In the illumination device 100 according to the first embodiment, as described above, the first light source device 10 includes the first ellipsoidal reflector 14, the first arc tube 12, and the first concave lens 18. ,
The second light source device 50 includes a second ellipsoidal reflector 54, a second arc tube 52, and a second concave lens 58.

For this reason, each ellipsoidal reflector 14 is sent from the first light source device 10 and the second light source device 50.
, 54 is emitted in parallel light beams smaller than the size of the projector 54, so that the projector can be miniaturized.

In the illumination device 100 according to the first embodiment, as described above, the first auxiliary mirror 16 and the second auxiliary mirror 5 as reflecting means are provided in the first arc tube 12 and the second arc tube 52, respectively.
6 are provided.

For this reason, the light emitted from each arc tube 12, 52 to the illuminated area side is emitted from each arc tube 12, 52.
Therefore, it is not necessary to set the size of each of the ellipsoidal reflectors 14 and 54 so as to cover the ends of the light emitting tubes 12 and 52 up to the illuminated area side. The reflectors 14 and 54 can be reduced in size, and as a result, the projector can be reduced in size.
Further, since each of the ellipsoidal reflectors 14 and 54 can be downsized, the focusing angle and beam spot of the beam that is converged from the respective ellipsoidal reflectors 14 and 54 toward the second focal point of each of the ellipsoidal reflectors 14 and 54. Each of the concave lenses 18 and 58 can be reduced.
, The size of each polarization separation optical element 20, 60, and the size of the polarization beam combiner 90 can be further reduced, and the illumination device can be further miniaturized.

In the illumination device 100 according to the first embodiment, the polarization beam combiner 90 and the first polarization separation optical element 20, the first polarization separation optical element 20 and the first concave lens 18, the polarization beam combiner 90 and the second polarization separation. Since the optical element 60, the second polarization separation optical element 60, and the second concave lens 58 are arranged apart from each other, the position adjustment between the optical elements can be easily performed. Further, the thermal influence on each optical element can be reduced.

Although not shown here, the first light incident surface 94 and the second light incident surface 96 of the polarization beam combiner 90, the light incident surface and the light emission surface of the first polarization separation optical element 20, and the second The light incident surface and the light exit surface of the polarization separation optical element 60, the light entrance surface and the light exit surface of the first concave lens 18, and the light entrance surface and the light exit surface of the second concave lens 58 are coated with a dereflection film. Has been. Thereby, generation | occurrence | production of the unnecessary reflection in the illumination light beam which injects into each of these optical elements, and the illumination light beam inject | emitted from these each optical element can be suppressed.

In the lighting device 100 according to the first embodiment, quartz is used as the material of the first λ / 2 plate 30 and the second λ / 2 plate 70.

Since the light emitted from the first polarization separation optical element 20 and the second polarization separation optical element 60 has extremely high light intensity per unit area, the first λ / 2 plate 30 and the second λ / 2 are used. When light is absorbed even a small percentage by the plate 70, a large amount of heat is generated, and the first λ / 2 plate 30 and the second λ /
The temperature of the two plates 70 will rise. According to the lighting apparatus 100 according to the first embodiment, the first λ
Since the quartz is used as the / 2 plate 30 and the second λ / 2 plate 70, the temperature rise of the first λ / 2 plate 30 and the second λ / 2 plate 70 can be suppressed.

In the illumination device 100 according to the first embodiment, two first lens arrays 130 and 134 are used.
Since each of the first small lenses 132 and 136 is a lens array arranged in a matrix having 6 rows and 4 columns in the vertical direction and the horizontal direction, a sufficient light uniforming effect can be obtained by the lens array. However, it is possible to make the polarization conversion elements 150 and 155 arranged in the latter stage of the optical path relatively simple and small in structure. The illuminating device 100 according to Embodiment 1 is an illuminating device suitable for a projector including a liquid crystal device in which an aspect ratio (aspect ratio) of the image forming region is 3: 4.

In the illumination device 100 according to the first embodiment, the length along the horizontal direction (x-axis direction) of each of the second lens arrays 140 and 144 is the horizontal direction (x-axis direction) of each of the first lens arrays 130 and 134. Therefore, it is possible to use a lens array with no or little eccentricity as the first lens arrays 130 and 134 and the second lens arrays 140 and 144, and the first lens arrays 130 and 134. And the second lens array 140,
144 is easy to manufacture.

In the illuminating device 100 according to the first embodiment, each of the two polarization conversion elements 150 and 155 transmits the light beam related to the P-polarized component among the light beams emitted from the second lens arrays 140 and 144 and converts it into the S-polarized component. Since it has polarization separation surfaces 151 and 156 that reflect such a light beam in a direction away from the system optical axis OC (x-axis direction), the density of the light beam in the vicinity of the system optical axis OC (the optical axis of the superimposing lens 160). The polarization conversion element 150,
It becomes possible to raise the freedom degree of arrangement | positioning of 155. FIG.

The projector 1000 according to Embodiment 1 includes the illumination device 100 according to Embodiment 1 described above.
Liquid crystal devices 400R, 400G for modulating light from the illumination device 100 according to image information,
400B, and a projection optical system 600 that projects light modulated by the liquid crystal devices 400R, 400G, and 400B.

For this reason, according to the projector 1000 according to the first embodiment, the above-described illumination device 100 is provided.
Therefore, even if the light emission of the arc tube is weakened or cut off in any one of the first light source device 10 and the second light source device 50, the projector is a high-intensity projector. A projector capable of suppressing deterioration in quality is obtained.

In the illumination device 100 according to the first embodiment, the polarization beam combiner 90 and the first
Polarization separation optical element 20, first polarization separation optical element 20 and first concave lens 18, polarization beam combiner 90 and second polarization separation optical element 60, and second polarization separation optical element 60 and second concave lens. 58 are spaced apart from each other, but the present invention is not limited to this, and for example, the following modifications are possible.

[Modification 1]
FIG. 10 is a plan view illustrating a main part of the illumination device 100a according to the first modification of the first embodiment.
10, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 100a according to the first modification of the first embodiment basically has a configuration similar to that of the illumination device 100 according to the first embodiment. However, as illustrated in FIG. It differs from the illumination device 100 according to the first embodiment in that the first polarization separation optical element and the polarization beam combiner are bonded to the second polarization separation optical element.

That is, in the illumination device 100a according to the first modification of the first embodiment, as shown in FIG. 10, the first light incident surface 94 of the polarization beam combiner 90, the light exit surface of the first polarization separation optical element 20, and The first λ / 2 plate 30 is bonded via an adhesive layer C. In addition, the second light incident surface 96 of the polarization beam combiner 90, the light exit surface of the second polarization separation optical element 60, and the second λ / plate 70 are bonded via an adhesive layer C.

For this reason, unnecessary reflection between the polarization beam combiner 90 and the first polarization separation optical element 20 and between the polarization beam combiner 90 and the second polarization separation optical element 60 can be reduced. Utilization efficiency improves and stray light level decreases.

[Modification 2]
FIG. 11 is a plan view illustrating a main part of the illumination device 100b according to the second modification of the first embodiment.
In FIG. 11, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 100b according to the second modification of the first embodiment basically has a configuration similar to that of the illumination device 100 according to the first embodiment. However, as illustrated in FIG. 1 polarization separation optical element, polarization beam combiner and second polarization separation optical element, first polarization separation optical element and first concave lens in first light source device, second polarization separation optical element and second light source It differs from the illuminating device 100 which concerns on Embodiment 1 by the point to which the 2nd concave lens in an apparatus is each adhere | attached.

That is, in the illumination device 100b according to the second modification of the first embodiment, as shown in FIG. 11, the first light incident surface 94 of the polarization beam combiner 90, the light exit surface of the first polarization separation optical element 20, and The first λ / 2 plate 30 is bonded via an adhesive layer C. In addition, the second light incident surface 96 of the polarization beam combiner 90, the light exit surface of the second polarization separation optical element 60, and the second λ / plate 70 are bonded via an adhesive layer C. Further, the light incident surface of the first polarization separation optical element 20 and the light exit surface of the first concave lens 18 are bonded via an adhesive layer C. In addition, the light incident surface of the second polarization separation optical element 60 and the light exit surface of the second concave lens 58 are bonded via an adhesive layer C.

Therefore, between the polarization beam combiner 90 and the first polarization separation optical element 20, between the polarization beam combiner 90 and the second polarization separation optical element 60, and between the first polarization separation optical element 20 and the first concave lens. 18 and unnecessary reflection between the second polarization separation optical element 60 and the second concave lens 58 can be reduced, so that the light utilization efficiency is improved and the stray light level is reduced.

In the lighting device 100 according to the first embodiment, the first λ / 2 plate 30 and the second λ
Although the / 2 plate 70 is arranged close to, the present invention is not limited to this, and for example, the following modifications are possible.

[Modification 3]
FIG. 12 is a plan view illustrating a main part of the illumination device 100c according to the third modification of the first embodiment.
In FIG. 12, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 100c according to the third modification of the first embodiment basically has a configuration similar to that of the illumination device 100 according to the first embodiment. However, as illustrated in FIG. 12, the first λ / 2 plates and 2nd
The arrangement position of the λ / 2 plate is different from that of the lighting device 100 according to the first embodiment.

In other words, in the illumination device 100c according to the third modification of the first embodiment, as shown in FIG. 12, the first λ / 2 plate 30c and the second λ / 2 plate 70c are arranged apart from each other. Note that the arrangement position of the first light source device 10 and the configuration of the first polarization separation optical element 20c are different from those described in the first embodiment because the arrangement position of the first λ / 2 plate 30c is different. ing. Further, as the arrangement position of the second λ / 2 plate 70c is different, the arrangement position of the second light source device 50 and the configuration of the second polarization separation optical element 60c are different from those described in the first embodiment. ing.

As described above, the lighting device 100c according to the third modification of the first embodiment is different from the lighting device 100 according to the first embodiment in the arrangement positions of the first λ / 2 plate and the second λ / 2 plate. However, as in the case of the illumination device 100 according to the first embodiment, the first polarization separation optical element 20c includes the first
The illumination light beam transmitted through the polarization separation surface 22c and the illumination light beam reflected by the second polarization separation surface 62c in the second polarization separation optical element 60c are combined, and the first polarization separation optical element 20c has the first light beam. The first polarization separation optical element 20c and the second polarization separation optical element 20c are combined so that the illumination light beam reflected by the polarization separation surface 22c and the illumination light flux transmitted through the second polarization separation surface 62c in the second polarization separation optical element 60c are combined. Since each of the two polarization separation optical elements 60c is disposed, the light intensity of the illumination light beam transmitted through the polarization separation surface and the polarization separation can be obtained even when a polarization separation optical element having a bias in polarization separation is used. A difference from the light intensity of the illumination light beam reflected by the surface can be canceled out. For this reason, it can suppress that a light quantity difference arises in the illumination light beam inject | emitted from the polarization beam combiner 90, and it becomes possible to suppress generation | occurrence | production of illumination nonuniformity.

In the illumination device 100 according to the first embodiment, the two λ / 2 plates (the first λ / 2 plate 30 and the second λ / 2 plate 70) are the first light incident on the polarization beam combiner 90. The surface 94 and the second light incident surface 96 are bonded to each other, but the present invention is not limited to this. For example, the following modifications are possible.

[Modification 4]
FIG. 13 is a plan view illustrating a main part of the illumination device 100d according to the fourth modification of the first embodiment.
In FIG. 13, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 100d according to the fourth modification of the first embodiment basically has a configuration similar to that of the illumination device 100 according to the first embodiment. However, as illustrated in FIG. The configuration is different from the illumination device 100 according to the first embodiment.

That is, in the illumination device 100d according to the fourth modification of the first embodiment, as shown in FIG. 13, a single λ / 2 plate 32 is provided as the first λ / 2 plate and the second λ / 2 plate. Λ / 2 plate 3
2 is bonded across the first light incident surface 94 and the second light incident surface 96 of the polarization beam combiner 90.

As described above, the illumination device 100d according to the fourth modification of the first embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the λ / 2 plate, but is otherwise according to the first embodiment. The first light source device 10 and the second light source device 5 have the same configuration as that of the device 100.
In any light source device of 0, even if the light emission of the arc tube is weakened or cut off, it is possible to prevent the in-plane light intensity distribution in the illuminated area from becoming non-uniform and to improve the quality of the projected image. It becomes possible to suppress deterioration.

In addition, in the illumination device 100d according to the fourth modification of the first embodiment, since one λ / 2 plate 32 is provided as the first λ / 2 plate and the second λ / 2 plate, the manufacturing cost can be reduced. There is also an effect that it can be achieved.

[Embodiment 2]
In describing the characteristics and effects of the illumination device 102 and the projector 1002 according to the second embodiment, first, the configuration of the projector 1002 will be described with reference to FIG.

FIG. 14 is a diagram for explaining the illumination device 102 and the projector 1002 according to the second embodiment. 14A is a plan view showing the optical system of the projector 1002, FIG. 14B is a side view showing the optical system of the projector 1002, and FIG. 14C shows the color wheel 710 with the system optical axis OC. It is the figure seen along. 14A and FIG.
4 (b), the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 14A and 14B, the projector 1002 according to the second embodiment includes an illumination device 102, a relay optical system 720 that guides an illumination light beam from the illumination device 102 to an illuminated area, and , A micromirror light modulator 410 as an electro-optic modulator that modulates light from the relay optical system 720 according to image information, and a projection surface such as a screen SCR for the light modulated by the micromirror light modulator 410 The projector includes a projection optical system 610 that projects onto the projector.

The illumination device 102 according to the second embodiment includes the first polarized light source device 40, the second polarized light source device 80, and the illumination light beam emitted from the first polarized light source device 40 and the second polarized light source device 80. A polarization beam combiner 90 that combines and emits, and an integrator optical system 122 that has a function of converting the illumination light beam from the polarization beam combiner 90 into light having a more uniform intensity distribution.
It is an illuminating device provided with.

Since the first polarized light source device 40, the second polarized light source device 80, and the polarized beam combiner 90 are the same as those described in the first embodiment, description thereof will be omitted.

The integrator optical system 122 converts the illumination light beam from the polarization beam combiner 90 into focused light and emits it, and the integrator that converts the illumination light beam from the light collection lens 162 into light having a more uniform intensity distribution. Rod 170.

The condenser lens 162 has a function of condensing the illumination light beam from the polarization beam combiner 90 near the light incident surface of the integrator rod 170. 14 (a) and 14
Although the condensing lens 162 shown in (b) is composed of one lens, it may be composed of a compound lens in which a plurality of lenses are combined.

The integrator rod 170 is an optical member having a function of converting light from the condensing lens 162 into light having a more uniform intensity distribution by multiple reflection of light from the condensing lens 162 on the inner surface. As the integrator rod 170, for example, a solid glass rod can be suitably used.

The shape of the light exit surface of the integrator rod 170 is the micromirror type light modulation device 410.
It is set so as to be almost similar to the shape of the image forming area. However, since the system optical axis OC is inclined with respect to the central axis of the micromirror light modulator 410, the light irradiated to the micromirror light modulator 410 is distorted in accordance with this inclination. It will have a contour shape. Therefore, the integrator rod 17 in such a case
The shape of the light exit surface of 0 is more preferably a shape that corrects distortion of the contour of light irradiated to the micromirror light modulator 410.

A color wheel 710 is disposed on the light emission side of the integrator rod 170. As shown in FIG. 14C, the color wheel 710 is divided 4 along the rotation direction.
This is a disk-shaped member in which three transmissive color filters 712R, 712G, and 712B are formed in one fan-shaped region. A motor 714 for rotating the color wheel 710 is disposed at the center of the color wheel 710.

The color filter 712 </ b> R transmits light in the red wavelength region of the illumination light flux from the integrator rod 170 and reflects or absorbs light in other wavelength regions, thereby transmitting only the red light component. Similarly, each of the color filters 712G and 712B transmits green light or blue light in the illumination light flux from the integrator rod 710, and reflects or absorbs light in other wavelength regions, thereby generating green light. Only the component or the blue light component is transmitted. As the color filters 712R, 712G, and 712B, for example, a dielectric multilayer film, a filter plate formed using a paint, or the like can be preferably used. In the four fan-shaped regions, the portions other than the color filters 712R, 712G, and 712B
12W, so that light from the integrator rod 170 can pass through as it is. The light-transmitting area 712W can increase the luminance in the projected image and ensure the brightness of the projected image.

Note that the color wheel 710 can be omitted, and the projected image in this case is a monochrome image.

The illumination light beam emitted from the integrator rod 170 passes through the color wheel 710 and becomes an illumination light beam including the three color light components of red light, green light, and blue light as described above. The image is magnified by the optical system 720 and irradiated onto the image forming region of the micromirror light modulator 410.

The relay optical system 720 includes a relay lens 722, a reflection mirror 724, and a condenser lens 72.
6 and has a function of guiding the illumination light beam from the illumination device 102 (color wheel 710) to the image forming area of the micromirror light modulation device 410.

The relay lens 722 has a function of forming an image in the vicinity of the image forming area of the micromirror light modulation device 410 without diverging the illumination light beam from the illumination device 102 together with the condenser lens 726. Note that the relay lens 722 illustrated in FIGS. 14A and 14B is configured by a single lens, but may be configured by a composite lens in which a plurality of lenses are combined.

The reflection mirror 724 is disposed so as to be inclined with respect to the system optical axis OC, and the relay lens 72.
The light beam from 2 is bent and guided to the micromirror light modulator 410. Thereby, a projector can be made compact.

The condenser lens 726 superimposes the illumination light flux from the relay lens 722 and the reflection mirror 724 on the image forming area of the micromirror light modulator 410 and projects the light modulated by the micromirror light modulator 410. The image is enlarged and projected together with the optical system 610.

The micromirror light modulator 410 has a function of emitting image light representing an image to the projection optical system 610 by reflecting light from the relay optical system 720 with a micromirror corresponding to each pixel in accordance with image information. Is a reflection direction control type light modulation device. As the micromirror light modulator 410, for example, DMD (digital micromirror device) (TI
Can be used.

The image light emitted from the micromirror light modulator 410 is enlarged and projected by the projection optical system 610 to form a large screen image on the screen SCR.

The micromirror light modulator 410 and the projection optical system 610 are arranged so that their central axes coincide with each other. When the projector 1002 according to the second embodiment is a projector having a tilting projection configuration, the projection optical axis 610ax of the projection optical system 610 is shifted in the tilting direction with respect to the central axis of the micromirror light modulator 410. It is preferable to configure as described above.

In the illumination device 102 and the projector 1002 according to the second embodiment configured as described above, as in the case of the illumination device 100 and the projector 1000 according to the first embodiment,
The first polarized light source device 40 that emits the illumination light beam related to the P-polarized component, the second polarized light source device 80 that emits the illumination light beam related to the S-polarized component, and the P emitted from the first polarized light source device 40 A polarization beam combiner 90 that combines and emits the illumination light beam related to the polarization component and the illumination light beam related to the S polarization component emitted from the second polarized light source device 80 is provided.

For this reason, according to the illumination device 102 according to the second embodiment, the illumination device 10 according to the first embodiment.
As in the case of 0, the in-plane light intensity distribution in the illuminated region is the same even if the light emission of the arc tube is weakened or cut off in any of the first light source device 10 and the second light source device 50. It becomes possible to suppress the non-uniformity and to suppress the deterioration of the quality of the projected image.

In the illumination device 102 according to the second embodiment, the integrator optical system 122 is
A condenser lens 162 that converts the illumination light beam from the polarization beam combiner 90 into focused light and emits it.
And the integrator rod 170 for converting the illumination light beam from the condenser lens 162 into light having a more uniform intensity distribution, the in-plane light intensity distribution of the illumination light beam can be made more uniform. .

Since the projector 1002 according to the second embodiment includes the illumination device 102 described above, the projector 1002 is a high-brightness projector, and the arc tube in any one of the first light source device 10 and the second light source device 50. Even if the emission of the light is weakened or cut off, the projector can suppress the deterioration of the quality of the projected image.

[Embodiment 3]
FIG. 15 is a diagram for explaining the illumination device 104 and the projector 1004 according to the third embodiment. 15A is a plan view showing the optical system of the projector 1004, FIG. 15B is a side view showing the optical system of the projector 1004, and FIG. 15C shows the light incident surface of the integrator rod 170B. It is the figure seen along the system optical axis OC. 15A and 15B, the same members as those in FIGS. 1 and 14 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 104 according to the third embodiment basically has a configuration that is very similar to the illumination device 100 according to the first embodiment, but the configuration of the integrator optical system is the illumination device 1 according to the first embodiment.
It is different from 00.

That is, in the illumination device 104 according to the third embodiment, FIGS. 15 (a) and 15 (b).
), The integrator optical system 122B converts the illumination light beam from the polarization beam combiner 90 into focused light and emits it, and the illumination light beam from the light collection lens 162 has a more uniform intensity distribution. Integrator rod 170B for converting to light, a reflecting layer 182 disposed on the light incident surface of integrator rod 170B and having an opening for light incidence at the center, and λ disposed on the light exit surface of integrator rod 170B. / 4 plate 184
And a reflective polarizing plate 186 disposed on the light exit side of the λ / 4 plate 184.

The integrator rod 170B is an optical member having a function of converting light from the condensing lens 162 into light having a more uniform intensity distribution by multiple reflection of light from the condensing lens 162 on the inner surface. For example, a solid glass rod can be suitably used as the integrator rod 170B.

The shape of the light exit surface of the integrator rod 170B is the liquid crystal device 400R, 400G, 4
It is set to be almost similar to the shape of the 00B image forming area.

Note that a relay lens 730 that guides an illumination light beam from the illumination device 104 is disposed in the latter stage of the optical path of the illumination device 104. The relay lens 730 includes condensing lenses 300R and 300R.
Along with G and 300B, the liquid crystal device 400R without diverging the illumination light beam from the illumination device 104
, 400G, 400B has a function of forming an image in the vicinity of the image forming area. Note that FIG.
The relay lens 730 shown in FIG. 15A and FIG. 15B is composed of a single lens.
You may be comprised with the compound lens which combined the some lens.

As described above, the illumination device 104 according to the third embodiment differs from the illumination device 100 according to the first embodiment in the configuration of the integrator optical system, but as in the case of the illumination device 100 according to the first embodiment, Linearly polarized light having mutually different polarization axes is emitted from the first polarized light source device 40 and the second polarized light source device 80, and these linearly polarized light is converted into the first light incident surface 94 and the second light in the polarization beam combiner 90. By making each incident on the incident surface 96, the illumination beam from the first light source device 10 and the second light source device 50 is emitted from the polarization beam combiner 90 in a completely superposed form. Therefore, the first light source device 10 and the second light source device 10
Even if the light emission of the arc tube is weakened or cut off in any one of the light source devices 50, it is possible to suppress the in-plane light intensity distribution in the illuminated area from becoming uneven and to project the projected image. It is possible to suppress the deterioration of the quality.

In the illumination device 104 according to the third embodiment, as shown in FIG. 15, the integrator optical system 122B is disposed on the light incident surface of the integrator rod 170B, and has a reflection portion having an opening for light incidence at the center. It further includes a layer 182, a λ / 4 plate 184 disposed on the light exit surface of the integrator rod 170 </ b> B, and a reflective polarizing plate 186 disposed on the light exit side of the λ / 4 plate 184.

Accordingly, when the illumination light beam related to one polarization component (for example, S polarization component) of the illumination light beam incident on the integrator rod 170B passes through the reflective polarizing plate 186, the other polarization component (for example, P polarization component). Is reflected by the reflective polarizing plate 186. The reflected light is reflected by the reflective layer 182 disposed on the light incident surface of the integrator rod 170B, and reaches the reflective polarizing plate 186 again. At this time, since this light has already passed through the λ / 4 plate 184 twice, the polarization direction is rotated by 90 degrees, and passes through the reflective polarizing plate 186 as an illumination light beam related to one polarization component. That is, it becomes possible to align the polarization direction of the light emitted from the integrator rod 170B with substantially one type of polarization direction. Therefore, it is particularly suitable for a projector using an electro-optic modulation device that controls the polarization direction, such as a liquid crystal device.

The illumination device 104 according to the third embodiment has the same configuration as that of the illumination device 100 according to the first embodiment except for the configuration of the integrator optical system, and thus the illumination device 10 according to the first embodiment.
It has the same effect as 0.

Since the projector 1004 according to the third embodiment includes the illumination device 104 described above, the projector 1004 is a high-intensity projector, and the arc tube in any one of the first light source device 10 and the second light source device 50. Even if the emission of the light is weakened or cut off, the projector can suppress the deterioration of the quality of the projected image.

[Embodiment 4]
FIG. 16 is a diagram for explaining the illumination device 106 and the projector 1006 according to the fourth embodiment. 16A is a plan view showing an optical system of the projector 1006, FIG. 16B is a side view showing the optical system of the projector 1006, and FIG. 16C is a polarization conversion element 190 and an integrator rod 170C. FIG. 16A and 16B, the same members as those in FIGS. 1 and 15 are denoted by the same reference numerals, and detailed description thereof is omitted.

The illumination device 106 according to the fourth embodiment basically has a configuration that is very similar to the illumination device 104 according to the third embodiment, but the configuration of the integrator optical system is the illumination device 1 according to the third embodiment.
It is different from 04.

The illumination device 106 according to the fourth embodiment includes an integrator optical system 12 as illustrated in FIG.
2C includes a condensing lens 162 that converts the illumination light beam from the polarization beam combiner 90 into a focused light and emits it, and a polarization conversion that converts the illumination light beam from the condensing lens 162 into a light beam having approximately one type of linearly polarized light component. It includes an element 190 and an integrator rod 170C that converts the illumination light beam from the polarization conversion element 190 into light having a more uniform intensity distribution.

The polarization conversion element 190 transmits one linearly polarized light component (for example, P-polarized light component) of the polarized light component included in the illumination light beam from the polarized beam combiner 90 as it is and the other linearly polarized light component (for example, S-polarized light component) as a system. A polarization separation surface 192 that reflects in a direction perpendicular to the optical axis OC (x-axis direction), and the other linearly polarized light component reflected by the polarization separation surface 192 reflects in a direction parallel to the system optical axis OC (z-axis direction). And a λ / 2 plate 196 as a phase difference plate that converts one linearly polarized light component transmitted through the polarization separating surface 192 into the other linearly polarized light component.
The polarization conversion element 190 transmits the illumination light beam related to the P-polarized light component and reflects the illumination light beam related to the S-polarized light component, and transmits the illumination light beam related to the S-polarized light component and the illumination related to the P-polarized light component. It is also possible to change to another polarization separation surface that reflects the light beam.

The integrator rod 170C is an optical member having a function of converting the light from the polarization conversion element 190 into light having a more uniform intensity distribution by multiple reflection of the light from the polarization conversion element 190 on the inner surface. For example, a solid glass rod can be suitably used as the integrator rod 170C.

The shape of the light exit surface of the integrator rod 170C is the liquid crystal device 400R, 400G, 4
It is set to be almost similar to the shape of the 00B image forming area.

As described above, the illumination device 106 according to the fourth embodiment differs from the illumination device 104 according to the third embodiment in the configuration of the integrator optical system, but the illumination device 1 according to the first and third embodiments.
As in the case of 00, 104, linearly polarized light having mutually different polarization axes is emitted from the first polarized light source device 40 and the second polarized light source device 80, and these linearly polarized light is converted into the first polarization beam combiner 90 by the first polarization light source device 90. By making the light incident surface 94 and the second light incident surface 96 enter, the polarization beam combiner 90 causes the first light source device 10 and the second light source device 50 to enter.
The illumination light beam from is emitted in a completely superimposed form. For this reason, even if the light emission of the arc tube is weakened or cut off in any of the first light source device 10 and the second light source device 50, the in-plane light intensity distribution in the illuminated region becomes non-uniform. It becomes possible to suppress this and to suppress the deterioration of the quality of the projected image.

In the illumination device 106 according to the fourth embodiment, the integrator optical system 122C is disposed on the light incident side of the integrator rod 170C, and the illumination light beam from the condenser lens 162 is converted into a light beam having substantially one type of linearly polarized light component. It further has a polarization conversion element 190 for conversion. This makes it possible to align the polarization direction of the light incident on the integrator rod 170C to substantially one type of polarization direction, which is particularly suitable for a projector using an electro-optic modulation device that controls the polarization direction, such as a liquid crystal device. It will be something.

In the illumination device 106 according to the fourth embodiment, as shown in FIG. 16, the integrator rod 170C and the polarization conversion element 190 are bonded by an adhesive having the same refractive index as that of the integrator rod 170C and the polarization conversion element 190. Therefore, undesirable multiple reflection between the polarization conversion element 190 and the integrator rod 170C is suppressed, and the light use efficiency does not decrease and the stray light level does not increase. Further, the polarization conversion element 190 and the integrator rod 170C can be easily integrated. Also,
It is possible to prevent the occurrence of positional deviation after assembly of the device between the polarization conversion element 190 and the integrator rod 170C.

The illumination device 106 according to the fourth embodiment has the same configuration as the illumination devices 100 and 104 according to the first and third embodiments except for the configuration of the integrator optical system, and thus the illumination device 100 according to the first and third embodiments. , 104 has the same effect.

Since the projector 1006 according to the fourth embodiment includes the above-described illumination device 106, the projector 1006 is a high-intensity projector, and the arc tube in any one of the first light source device 10 and the second light source device 50. Even if the emission of the light is weakened or cut off, the projector can suppress the deterioration of the quality of the projected image.

As mentioned above, although the illuminating device and projector of this invention were demonstrated based on said each embodiment,
The present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

(1) In the projector 1000 according to the first embodiment, as the liquid crystal device, the liquid crystal devices 400R and 400 having an image forming region having a planar shape of “short side: long side = 3: 4 rectangle”.
Although G and 400B are used, the present invention is not limited to this, and a wide vision liquid crystal device in which the image forming area has a planar shape of “short side: long side = 9: 16 rectangle” is used. You can also. In this case, it is preferable to use a first lens array having a configuration in which a plurality of first small lenses are arranged in a matrix of 7 rows and 4 columns in a plane perpendicular to the z-axis.

(2) In the illuminating devices 100 to 106 of the above-described embodiments, as the first light source device and the second light source device, an ellipsoidal reflector, and an arc tube having a light emission center near the first focal point of the ellipsoidal reflector, Although the light source device having the concave lens that emits the focused light reflected by the ellipsoidal reflector toward the light incident surface of the polarization separation optical element is used, the present invention is not limited to this. A light source device having a parabolic reflector and an arc tube having a light emission center near the focal point of the parabolic reflector can also be preferably used.

(3) In the illuminating devices 100 to 106 of the above embodiments, the illuminating device in which the auxiliary mirror as the reflecting means is disposed on the arc tube is described as an example, but the present invention is limited to this. It is also possible to apply the present invention to an illuminating device not provided with an auxiliary mirror.

(4) In the illuminating devices 100 to 106 of the above embodiments, a cube-type polarization beam combiner 90 in which two triangular prisms are bonded together as a polarization beam combiner.
However, the present invention is not limited to this, and a plate-type polarization beam combiner can also be preferably used. Moreover, the illuminating devices 100 to 10 according to the above embodiments.
6, the polarization separation optical element provided with the prism is used as the first polarization separation optical element and the second polarization separation optical element. However, the present invention is not limited to this, and plate-type polarization A separation optical element can also be preferably used. As the plate-type polarization beam combiner and the plate-type polarization separation optical element, a configuration in which a polarization separation film is provided on a translucent substrate can be appropriately employed.

(5) In the illumination devices 100 to 106 according to the above embodiments, the first polarized light source device 40 emits an illumination light beam related to the P-polarized component, and the second polarized light source device 80 emits an illumination light beam related to the S-polarized component. , And the polarization beam combiner 90 includes the polarization combining surface 92 that transmits the illumination light beam related to the P-polarized component and reflects the illumination light beam related to the S-polarized component, but the present invention is not limited to this. The first polarized light source device emits the illumination light beam related to the S-polarized component, the second polarized light source device emits the illumination light beam related to the P-polarized component, and the polarized beam combiner emits the illumination light beam related to the S-polarized component. It is also possible to have a configuration including a polarization combining surface that transmits and reflects the illumination light beam related to the P-polarized component.

(6) In the illumination devices 100 to 106 according to the above embodiments, the first λ / 2 plate 30 and the second λ / 2 plate 70 are the first light incident surface 94 and the second λ / 2 plate 70 of the polarization beam combiner 90. However, the present invention is not limited to this, and the light exit surface of the first polarization separation optical element 20 and the second polarization separation optical element 60 are not limited to this. You may affix on the predetermined position in a light-projection surface.

(7) In the illuminating devices 102 to 106 according to Embodiments 2 to 4 described above, a solid glass rod with internal total reflection type is used as the integrator rod, but the present invention is not limited to this. For example, you may use hollow rods, such as a cylindrical light tunnel which bonded together the reflective surface in four reflection mirrors toward the inner side.

(8) The projector 1000 according to the first embodiment is a transmissive projector, but the present invention is not limited to this. The present invention can also be applied to a reflection type projector. Here, “transmission type” means that an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means is a type that reflects light, such as a reflective liquid crystal device. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(9) In the projector 1000 according to the first embodiment, the three liquid crystal devices 400R.
However, the present invention is not limited to this, and can be applied to a projector using one, two, or four or more liquid crystal devices. .

(10) In the projector 1002 according to the second embodiment, the projector using one micromirror light modulation device 410 is described as an example. However, the present invention is not limited to this, and a plurality of micromirrors is used. The present invention can also be applied to a projector using a mirror type light modulation device.

(11) In the projector 1002 according to the second embodiment, the color wheel 710 is arranged on the light emission side of the integrator rod 170. However, the present invention is not limited to this, and the light incident side of the integrator rod. A color wheel may be arranged.

(12) The present invention is applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

FIG. 3 is a view for explaining the illumination device 100 and the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the principal part of the illuminating device 100 which concerns on Embodiment 1. FIG. The figure which shows a mode that the illumination light beam inject | emitted from the 1st light source device 10 and the 2nd light source device 50 is polarization-separated and synthesize | combined. The front view of the 1st lens array 130,134. The figure which shows the light ray in the integrator optical system. The figure which shows in-plane light intensity distribution in the light emission surface of the polarization conversion elements 150 and 155. FIG. The figure shown in order to demonstrate the illumination state when light emission of the 1st arc tube 12 of the 1st light source device 10 cuts off. The figure shown in order to demonstrate the illumination state when light emission of the 2nd light emission tube 52 of the 2nd light source device 50 cut off. The figure shown in order to demonstrate the illuminating device 100 which concerns on Embodiment 1, and the illuminating device 900 which concerns on a comparative example. FIG. 6 is a plan view showing a main part of a lighting device 100a according to a first modification of the first embodiment. FIG. 6 is a plan view showing a main part of a lighting device 100b according to a second modification of the first embodiment. FIG. 6 is a plan view showing a main part of a lighting device 100c according to a third modification of the first embodiment. FIG. 6 is a plan view showing a main part of a lighting device 100d according to a fourth modification of the first embodiment. FIG. 6 is a diagram for explaining an illumination device 102 and a projector 1002 according to a second embodiment. FIG. 10 is a view for explaining an illumination device 104 and a projector 1004 according to a third embodiment. FIG. 10 is a view for explaining an illumination device 106 and a projector 1006 according to a fourth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,50 ... Light source device, 10ax, 50ax ... Optical axis of light source device, 12, 52 ... Arc tube,
4, 54 ... Ellipsoidal reflector, 16, 56 ... Auxiliary mirror, 18, 58 ... Concave lens, 20,
20c, 60, 60c, 920... Polarization separation optical element, 22, 22c, 62, 62c, 15
1, 156, 192, 922... Polarization separation plane, 24, 24c, 64, 64c, 152, 15
7, 194, 924... Reflective surface, 30, 30c, 32, 70, 70c, 153, 158, 1
96 ... λ / 2 plate, 40, 80 ... Polarized light source device, 90 ... Polarized beam combiner, 92 ... Polarized light combining surface, 94 ... First light incident surface (of the polarized beam combiner), 96 ... (of the polarized beam combiner) Second light incident surface, 100, 100a, 100b, 100c, 100d, 102,
104, 106, 900 ... Illumination device, 120, 122, 122B, 122C ... integrator optical system, 130, 134 ... first lens array, 132, 136 ... first small lens, 14
0, 144 ... second lens array, 142, 146 ... second small lens, 150, 155, 19
0: polarization conversion element, 160: superimposing lens, 162, 300R, 300G, 300B, 72
6 ... Condensing lens, 170, 170B, 170C ... Integrator rod, 182 ... Reflective layer, 184 ... λ / 4 plate, 186 ... Reflection side polarizing plate, 200 ... Color separation light guide optical system, 210, 22
0 ... Dichroic mirror, 230, 240, 250, 724 ... Reflection mirror, 260 ... Incident side lens, 270, 722, 730 ... Relay lens, 400R, 400G, 400B ...
Liquid crystal device 410... Micromirror type light modulation device 500. Cross dichroic prism 600, 610 Projection optical system 610ax Projection optical axis 710 Color wheel 7
12R, 712G, 712B ... Color filter, 712W ... Translucent area, 714 ... Motor,
720 ... Relay optical system, 1000, 1002, 1004, 1006 ... Projector, C ...
Adhesive layer, OC ... System optical axis, SCR ... Screen

Claims (13)

A polarization beam combiner having a first light incident surface and a second light incident surface;
A first polarized light source device that is disposed on the first light incident surface and emits an illumination light beam according to a first polarization component;
A second polarized light source device that is disposed on the second light incident surface and emits an illumination light beam according to a second polarization component having a polarization axis different from that of the illumination light beam according to the first polarization component;
An integrator optical system having a function of converting the illumination light beam from the polarization beam combiner into light having a more uniform intensity distribution;
The first polarized light source device includes:
A first light source device that emits a substantially parallel illumination light beam, and transmits an illumination light beam related to the first polarization component and reflects an illumination light beam related to the second polarization component among the illumination light beams from the first light source device The illumination light beam related to the second polarization component reflected by the first polarization separation surface and the first polarization separation surface is parallel to the illumination light beam related to the first polarization component transmitted through the first polarization separation surface. A first polarization separation optical element having a first reflection surface that reflects toward a different direction and a position where an illumination light beam related to a second polarization component emitted from the first polarization separation optical element passes. And a first retardation plate that converts the illumination light beam related to the second polarization component into the illumination light beam related to the first polarization component, and converts the illumination light beam from the first light source device to the first polarization The first light incidence of the polarization beam combiner as an illumination light beam related to a component And emitted toward the,
The second polarized light source device is
A second light source device that emits a substantially parallel illumination light beam, and transmits an illumination light beam related to the first polarization component and reflects an illumination light beam related to the second polarization component among the illumination light beams from the second light source device The illumination light beam related to the second polarization component reflected by the second polarization separation surface and the second polarization component surface parallel to the illumination light beam related to the first polarization component transmitted through the second polarization separation surface. A second polarization separation optical element having a second reflection surface that reflects toward a specific direction, and a position where an illumination light beam related to the first polarization component emitted from the second polarization separation optical element passes. A second retardation plate that converts the illumination light beam related to the first polarization component into the illumination light beam related to the second polarization component, and converts the illumination light beam from the second light source device to the second polarization The second light incidence of the polarization beam combiner as an illumination light beam related to a component And emitted toward the,
The polarization beam combiner is
The illumination light beam related to the first polarization component transmitted through the first polarization separation surface and the illumination light beam related to the second polarization component reflected by the second polarization separation surface are combined, and the first light beam After the light is reflected by the polarization separation surface and transmitted through the second polarization separation surface after being reflected by the first phase difference plate and converted by the first phase difference plate, the light is polarized by the second phase difference plate. An illumination apparatus comprising: combining the converted illumination light beam related to the second polarization component; and emitting the resultant light toward the integrator optical system. The lighting device according to claim 1.
An illumination apparatus comprising: a polarization separation optical element manufactured in the same lot as the first polarization separation optical element and the second polarization separation optical element. The lighting device according to claim 1 or 2,
The first retardation plate and the second retardation plate are composed of one retardation plate,
The phase difference plate includes the first light incident surface and the second light beam in the polarization beam combiner.
A lighting device characterized by being bonded across the light incident surface. In the illuminating device in any one of Claims 1-3,
The first light source device includes a first ellipsoidal reflector, a first arc tube having an emission center in the vicinity of a first focal point of the first ellipsoidal reflector, and a focus from the first ellipsoidal reflector. A first concave lens that emits light toward a position corresponding to the first polarization separation surface on the light incident surface of the first polarization separation optical element;
The second light source device includes a second ellipsoidal reflector, a second arc tube having a light emission center in the vicinity of a first focal point of the second ellipsoidal reflector, and a focus from the second ellipsoidal reflector. An illumination device comprising: a second concave lens that emits light toward a position corresponding to the second polarization separation surface on the light incident surface of the second polarization separation optical element. The lighting device according to claim 4.
The first arc tube receives light emitted from the first arc tube toward the illuminated area.
First reflecting means for reflecting toward the arc tube is provided,
The second arc tube receives light emitted from the second arc tube toward the illuminated area side.
A lighting device characterized in that a second reflecting means for reflecting toward the arc tube is provided. In the illuminating device in any one of Claims 1-5,
The first light incident surface of the polarization beam combiner and the light exit surface of the first polarized light source device are bonded,
The illumination device, wherein the second light incident surface of the polarization beam combiner is bonded to a light emission surface of the second polarized light source device. In the illuminating device in any one of Claims 1-6,
The light incident surface of the first polarization separation optical element and the light exit surface of the first concave lens in the first light source device are bonded,
An illumination device, wherein a light incident surface of the second polarization separation optical element and a light exit surface of the second concave lens in the second light source device are bonded. In the illuminating device in any one of Claims 1-5,
The polarization beam combiner and the first polarization separation optical element, the first polarization separation optical element and the first concave lens, the polarization beam combiner and the second polarization separation optical element, and the second polarization separation. An illumination device, wherein the optical element and the second concave lens are spaced apart from each other. In the illuminating device in any one of Claims 1-8,
The integrator optical system is
A condensing lens that converts the illumination light beam from the polarization beam combiner into a focused light beam, and
An illuminating device comprising: an integrator rod for converting an illumination light beam from the condenser lens into light having a more uniform intensity distribution. The lighting device according to claim 9.
The integrator optical system is
A reflective layer disposed on the light incident surface of the integrator rod and having an opening for light incidence in the center;
A λ / 4 plate disposed on the light exit surface of the integrator rod;
The illumination apparatus further comprising a reflective polarizing plate disposed on the light exit side of the λ / 4 plate. The lighting device according to claim 9.
The integrator optical system is
An illumination apparatus, further comprising a polarization conversion element that is disposed on the light incident side of the integrator rod and converts an illumination light beam from the condenser lens into a light beam having substantially one type of linearly polarized light component. In the illuminating device in any one of Claims 1-8,
The integrator optical system is
Two first lens arrays each having a plurality of first small lenses for dividing an illumination light beam from the polarization beam combiner into a plurality of partial light beams;
Two second lens arrays each having a plurality of second small lenses corresponding to the first small lenses of the two first lens arrays;
Two polarization conversion elements for converting each partial light beam from the two second lens arrays into a light beam having substantially one type of linearly polarized light component;
A superimposing lens that superimposes each light from the two polarization conversion elements in the illuminated region,
Each of the two first lens arrays, the two second lens arrays, and the two polarization conversion elements are arranged symmetrically with respect to a virtual plane including an optical axis of the superimposing lens. Lighting device. The lighting device according to any one of claims 1 to 12,
An electro-optic modulator that modulates light from the illumination device according to image information;
A projector comprising: a projection optical system that projects light modulated by the electro-optic modulation device.