JP2007065016A - Illuminator and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminator designed such that while the miniaturization of the illuminator is achieved, an illuminating luminous flux emitted from the illuminator can be modified into an illuminating luminous flux that has more uniform distribution of light intensity in a plane. <P>SOLUTION: The illuminator 100 includes: a light source device 110 emitting a luminous flux that is convergent toward an area to be illuminated; and a rod integrator 140A for modifying the illuminating luminous flux from the light source device 110 into an illuminating luminous flux that has more uniform distribution of light intensity in the plane. The light emission face 140A<SB>o</SB>of the integrator rod 140A has two sides parallel to a y-axis direction and two sides parallel to an x-axis direction and has such a shape that the dimension in the y-axis direction is shorter than that in the x-axis direction. The illuminator 100 further includes an anamorphic lens 120A disposed between the light source device 110 and the integrator rod 140A. In the anamorphic lens 120A, refracting power in the x-axis direction is greater than that in the y-axis direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Generally, a projector includes an illumination device that emits an illumination light beam, an electro-optic modulation device that modulates the illumination light beam from the illumination device according to image information, and a projection surface such as a screen that modulates the illumination light beam modulated by the electro-optic modulation device. A projection optical system for projecting onto the projector.

  Conventionally, an illumination device having an integrator rod is known as an illumination device used for a projector (see, for example, Patent Document 1). According to the conventional illumination device, the illumination light beam emitted from the light source device enters the integrator rod and is emitted after repeating internal reflection, so that the in-plane light intensity of the illumination light beam emitted from the light source device Even when the distribution is not uniform, the function of the integrator rod enables the illumination light beam emitted from the illumination device to be an illumination light beam having a more uniform in-plane light intensity distribution. Then, by irradiating the image forming area of the electro-optic modulator with the illumination light beam having such a substantially uniform in-plane light intensity distribution, the brightness of the image projected on the projection surface is made substantially uniform. Is possible.

JP 2002-90883 A

  By the way, since the light exit surface of the integrator rod and the image forming area of the electro-optic modulator have a conjugate relationship, the shape of the light exit surface of the integrator rod and the planar shape of the image forming area are substantially similar. Usually, the vertical dimension orthogonal to the illumination optical axis in the image forming area is different from the horizontal dimension orthogonal to the illumination optical axis (for example, the aspect ratio is 3: 4 or 9:16). Similarly, the vertical dimension and the horizontal dimension of the light exit surface of the integrator rod are different. As a result, the conventional lighting device has the following problems.

FIG. 8 is a diagram for explaining a problem in the conventional lighting device. 8A is a view of the integrator rod 940 in the conventional lighting device as viewed from above, FIG. 8B is a view of the integrator rod 940 as viewed from the side, and FIG. 8C is a view of the integrator rod 940. it is a diagram showing the light exit plane 940 _o.
Here, the case where the conventional illumination device is used in a projector having an electro-optic modulation device having a rectangular shape in plan view with an aspect ratio of the image forming area of 3: 4 is described as an example. The light exit surface 940 _o of 940 has a shape made of a rectangular shape in plan view with an aspect ratio of 3: 4 (see FIG. 8C). Further, the light incident surface 940 _i of the integrator rod 940 has the same shape as the light emitting surface 940 _o .

In the conventional illumination device, as shown in FIG. 8, the vertical dimension (D _A ) and the horizontal dimension (D _B ) of the light exit surface 940 _o of the integrator rod 940 are different. ) And the illumination light beam incident from the direction shown in FIG. 8B are different in the number of internal reflections. In other words, than the illumination light beam incident from the vertical direction to the light incident surface 940 _i of the integrator rod 940 (illumination light beam shown in FIG. 8 (b)), laterally with respect to the light incident surface 940 _i of the integrator rod 940 The incident illumination light beam (illumination light beam shown in FIG. 8A) reduces the number of internal reflections and weakens the light uniformity effect. For this reason, in order to obtain a predetermined light uniforming effect, there is a problem that it is necessary to increase the length of the integrator rod. As a result, there is a problem that it is not easy to downsize the lighting device.

  Accordingly, the present invention has been made to solve such a problem, and the illumination light beam emitted from the illumination device has a more uniform in-plane light intensity distribution while reducing the size of the illumination device. It is an object of the present invention to provide a lighting device that can be used. It is another object of the present invention to provide a projector that includes such an excellent illumination device and can make the brightness of an image projected on a projection plane more uniform while reducing the size of the projector.

  As a result of intensive efforts to achieve the above object, the inventors of the present invention have a light emitting surface having a shape in which the dimension along the first direction is set shorter than the dimension along the second direction. In the illumination device including the integrator rod, the incident angle of the illumination light beam incident on the light incident surface of the integrator rod from the second direction is incident on the light incident surface of the integrator rod from the first direction. By making it larger than the incident angle of the illumination beam, the illumination beam emitted from the illumination device can be made into an illumination beam having a more uniform in-plane light intensity distribution while reducing the size of the illumination device. That led to the completion of the present invention.

  That is, the illumination device of the present invention includes a light source device that emits a convergent illumination light beam toward the illuminated region side, and an integrator that converts the illumination light beam from the light source device into an illumination light beam having a more uniform in-plane light intensity distribution The light emitting surface of the integrator rod has two sides parallel to the first direction orthogonal to the illumination optical axis, the illumination optical axis and the second direction orthogonal to the first direction. The light source device and the integrator rod, each having two sides parallel to a direction, and having a shape in which a dimension along the first direction is set shorter than a dimension along the second direction. And an anamorphic lens having a refractive power in the second direction larger than that in the first direction.

For this reason, according to the illumination device of the present invention, in the upstream stage of the optical path of the integrator rod composed of the light exit surface having a shape along which the dimension along the first direction is set shorter than the dimension along the second direction, Since the anamorphic lens having the refractive power in the second direction larger than the refractive power in the first direction is arranged, the incident angle of the illumination light beam incident from the second direction is set to the incident light beam incident from the first direction. It can be made larger than the incident angle. For this reason, the illumination light beam incident from the second direction travels through the integrator rod while being totally reflected at a deeper angle (with a reflection angle smaller than the reflection angle of the illumination light beam incident from the first direction). Therefore, it is suppressed that the number of internal reflections is smaller than the illumination light beam incident from the first direction, and the light uniformizing effect in the integrator rod is suppressed from being weakened. Moreover, the size of the irradiation spot on the light incident surface of the integrator rod can be increased along the second direction by the function of the anamorphic lens described above.
As a result, the illumination light beam emitted from the illumination device can be changed to an illumination light beam having a more uniform in-plane light intensity distribution.

  Further, according to the illumination device of the present invention, the illumination light beam emitted from the illumination device can be changed to an illumination light beam having a more uniform in-plane light intensity distribution without increasing the length of the integrator rod. It becomes easy to reduce the size of the lighting device.

  For this reason, the illuminating device of the present invention is an illuminating device capable of making the illuminating light beam emitted from the illuminating device into an illuminating light beam having a more uniform in-plane light intensity distribution while reducing the size of the illuminating device. .

  In the illumination device of the present invention, as the anamorphic lens, for example, a cylindrical lens having a positive refractive power in the second direction and no refractive power in the first direction, or a refraction in the second direction. A toric lens (toroidal lens) whose force is larger than the refractive power in the first direction can be suitably used.

  By the way, in addition to the light source device and the integrator rod, there is known an illuminating device that further includes a polarization conversion element that aligns an illumination light beam emitted from the integrator rod with a non-uniform polarization direction into substantially one type of linearly polarized light (for example, (See JP 2002-268008 A).

  In the illumination device further including such a polarization conversion element, the number of internal reflections varies depending on the incident direction of the illumination light beam incident on the integrator rod, as in the conventional illumination device. The number of times may be reduced, and the light uniformity effect may be weakened. For this reason, in the illumination device further including the polarization conversion element, it is necessary to increase the length of the integrator rod in order to obtain a predetermined light uniforming effect as in the case of the conventional illumination device. There was a problem. As a result, there is a problem that it is not easy to downsize the lighting device.

  The inventor of the present invention has found that the above-described problem can be solved by applying the concept of the lighting device of the present invention to a lighting device further including the polarization conversion element as described above. It came to complete the other illuminating device of invention.

  That is, another illumination device of the present invention includes a light source device that emits a convergent illumination light beam toward the illuminated region side, and converts the illumination light beam from the light source device into an illumination light beam having a more uniform in-plane light intensity distribution. An integrator rod, a polarization separation layer that transmits an illumination light beam related to one linearly polarized light component of the illumination light beam from the integrator rod and reflects an illumination light beam related to the other linearly polarized light component, and the other from the polarization separation layer A reflective layer that reflects the illumination light beam related to the linearly polarized light component in a direction parallel to the illumination optical axis, and a portion through which the illumination light beam related to the one linearly polarized light component that has passed through the polarization separation layer passes or the reflective layer And a polarization conversion element having a λ / 2 plate disposed in any of the portions through which the illumination light beam related to the other reflected linearly polarized light component passes. The light exit surface of the rod has two sides parallel to the first direction orthogonal to the illumination optical axis, and two sides parallel to the illumination optical axis and the second direction orthogonal to the first direction, and The first direction has a shape in which the dimension along the first direction is set longer than the dimension along the second direction, and is disposed between the light source device and the integrator rod, and the first direction. And an anamorphic lens having a refractive power greater than that in the second direction.

For this reason, according to another illumination device of the present invention, an optical path upstream of an integrator rod comprising a light exit surface having a shape in which the dimension along the first direction is set longer than the dimension along the second direction. In addition, since an anamorphic lens having a refractive power in the first direction larger than that in the second direction is disposed, the incident angle of the illumination light beam incident from the first direction is incident from the second direction. It can be made larger than the incident angle of the light beam. For this reason, the illumination light beam incident from the first direction travels through the integrator rod while being totally reflected at a deeper angle (with a reflection angle smaller than the reflection angle of the illumination light beam incident from the second direction). Therefore, it is suppressed that the number of times of internal reflection is smaller than the illumination light beam incident from the second direction, and the light uniformizing effect in the integrator rod is suppressed from being weakened. Moreover, the size of the irradiation spot on the light incident surface of the integrator rod can be increased along the first direction by the function of the anamorphic lens described above.
As a result, the illumination light beam emitted from the illumination device can be changed to an illumination light beam having a more uniform in-plane light intensity distribution.

  According to another illumination device of the present invention, the illumination light beam emitted from the illumination device can be changed to an illumination light beam having a more uniform in-plane light intensity distribution without increasing the length of the integrator rod. Therefore, it is easy to reduce the size of the lighting device.

  For this reason, in the same manner as the illumination device of the present invention described above, the other illumination device of the present invention has a more uniform in-plane light intensity distribution for the illumination light beam emitted from the illumination device while reducing the size of the illumination device. It becomes an illuminating device which can be made into the illumination light beam which has.

  In another illumination device of the present invention, as the anamorphic lens, for example, a cylindrical lens having a positive refractive power in the first direction and no refractive power in the second direction, or the first direction A toric lens (toroidal lens) having a refractive power greater than that in the second direction can be suitably used.

  In another illumination device of the present invention, the dimension along the first direction on the light exit surface of the integrator rod is substantially the same as the dimension along the first direction of the polarization conversion element, It is preferable that the dimension along the second direction in the light exit surface of the integrator rod is substantially half of the dimension along the second direction in the polarization conversion element.

  By comprising in this way, it is suppressed as much as possible that the illumination light beam from an integrator rod injects into the polarization separation layer of a polarization conversion element efficiently, and reduces light utilization efficiency.

  In another illumination device of the present invention, it is preferable that the light exit surface of the integrator rod and the light incident surface of the polarization conversion element are bonded.

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

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

  In another illuminating device of the present invention, the illuminating device may further include a light guide member that is disposed downstream of the optical path of the polarization conversion element and has a function of equalizing an in-plane light intensity distribution of the illumination light beam from the polarization conversion element. preferable.

  With this configuration, the in-plane light intensity distribution of the illumination light beam emitted from the polarization conversion element can be made more uniform.

  In another illumination device of the present invention, the light guide member may be a hollow light guide member or a solid light guide member.

  As the hollow light guide member, for example, a cylindrical light tunnel in which the reflection surfaces of four reflection mirrors are bonded inward can be preferably used. In addition, as the solid light guide member, for example, a solid optical block of an internal total reflection type can be suitably used.

  Here, when a solid light guide member is used as the light guide member, the light exit surface of the polarization conversion element and the light incident surface of the light guide member are preferably bonded.

  With this configuration, undesirable multiple reflection between the polarization conversion element and the light guide member is 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 light guide member can be easily integrated. In addition, it is possible to prevent the occurrence of displacement between the polarization conversion element and the light guide member after assembly of the device.

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

  In the illumination device of the present invention or another illumination device of the present invention, it is preferable that the anamorphic lens and the integrator rod are arranged apart from each other.

  With this configuration, the position adjustment between the anamorphic lens and the integrator rod can be easily performed. Further, since the anamorphic lens and the integrator rod are arranged apart from each other, the thermal influence can be reduced.

  In this case, it is preferable that a light-reflecting film is coated on the light incident surface and the light emitting surface of the anamorphic lens and the light incident surface of the integrator rod.

  Thereby, it is possible to suppress the occurrence of unnecessary reflection in the illumination light beam incident on the light incident surface of the anamorphic lens and the light incident surface of the integrator rod and the illumination light beam emitted from the light emission surface of the anamorphic lens.

  In the illuminating device of the present invention or another illuminating device of the present invention, it is preferable that the light emitting surface of the anamorphic lens and the light incident surface of the integrator rod are bonded.

  By configuring in this way, undesirable multiple reflections between the anamorphic lens and the integrator rod are suppressed, and the light utilization efficiency does not decrease and the stray light level does not increase. Further, the anamorphic lens and the integrator rod can be easily integrated. In addition, it is possible to prevent the occurrence of misalignment between the anamorphic lens and the integrator rod after the device is assembled. Furthermore, since a normal integrator rod can be used as the integrator rod, the manufacturing cost can be reduced.

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

  In the illumination device of the present invention or another illumination device of the present invention, it is preferable that the anamorphic lens and the integrator rod are integrally formed.

  By configuring in this way, undesirable multiple reflections between the anamorphic lens and the integrator rod are suppressed, and the light utilization efficiency does not decrease and the stray light level does not increase. In addition, since the anamorphic lens and the integrator rod are integrally formed, there is no occurrence of positional displacement after assembly of the device between the anamorphic lens and the integrator rod.

  In this case, the anamorphic lens and the integrator rod can be manufactured by subjecting one end of a rod-shaped member to lens processing and then surface grinding / polishing the other five surfaces, or one of the rectangular parallelepiped rods. It can also be manufactured by lens processing at the end.

  The projector of the present invention is modulated by the illumination device of the present invention or another illumination device of the present invention, an electro-optic modulation device that modulates an illumination light beam from the illumination device according to image information, and the electro-optic modulation device. And a projection optical system for projecting the light.

  For this reason, since the projector of the present invention includes the excellent illumination device as described above, it is possible to make the brightness of the image projected on the projection surface more uniform while reducing the size of the projector. Become a projector.

  In this case, the electro-optic modulator may be a transmissive liquid crystal device, a reflective liquid crystal device, or a micromirror type light modulator.

  In the projector according to the aspect of the invention, a color separation light guide optical system that separates an illumination light beam from the illumination device into a plurality of color lights and guides the illumination light beam to an illuminated area between the illumination device and the electro-optic modulation device. In addition, as the electro-optic modulator, a plurality of electro-optic modulators for modulating a plurality of color lights emitted from the color separation light guide optical system according to image information corresponding to the respective color lights are provided. Is preferred.

  With this configuration, the brightness of an image projected on the projection surface can be made more uniform, and a projector that can be easily reduced in size is a full-color projector with excellent image quality (for example, a three-plate type). And will be able to.

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

[Embodiment 1]
First, configurations of the illumination device 100 and the projector 1000 according to the first embodiment will be described with reference to FIG.
FIG. 1 is a diagram for explaining an illumination device 100 and a projector 1000 according to the first embodiment. 1A is a view of the optical system of the projector 1000 as viewed from above, FIG. 1B is a view of the optical system of the projector 1000 as viewed from the side, and FIG. 1C is a view of the anamorphic lens 120A. FIG. 1D is a front view of the color wheel 130. FIG.

  In the following description, the three directions orthogonal to each other are defined as the z-axis direction (illumination optical axis 100ax direction in FIG. 1A) and the x-axis direction (parallel to the paper surface in FIG. And a direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis.

  As shown in FIGS. 1A and 1B, a projector 1000 according to the first embodiment includes an illumination device 100 that emits an illumination light beam, and a relay optical system that guides light from the illumination device 100 to an illuminated area. 300, a micromirror light modulator 400 as an electro-optic modulator that modulates light from the relay optical system 300 according to image information, and light modulated by the micromirror light modulator 400 such as a screen SCR. The projector includes a projection optical system 600 that projects onto a projection surface.

  The illumination device 100 according to the first embodiment includes a light source device 110 that emits an illumination light beam, and an integrator rod 140A that converts the illumination light beam from the light source device 110 into an illumination light beam having a more uniform in-plane light intensity distribution. Device. The illumination device 100 further includes an anamorphic lens 120A and a color wheel 130 disposed between the light source device 110 and the integrator rod 140A.

  The light source device 110 includes an ellipsoidal reflector 114, an arc tube 112 having a light emission center near the first focal point of the ellipsoidal reflector 114, and light emitted from the arc tube 112 toward the illuminated area. And an auxiliary mirror 116 as a reflecting means for reflecting the light toward the ellipsoidal reflector 114. The light source device 110 emits an illumination light beam having the illumination optical axis 100ax as a central axis.

The arc tube 112 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion.
The ellipsoidal reflector 114 includes a cylindrical neck that is inserted and fixed to one sealing portion of the arc tube 112, and a reflective concave surface that reflects light emitted from the arc tube 112 toward the second focal position. have.

  The auxiliary mirror 116 is provided to face the ellipsoidal reflector 114 with the arc tube 112 interposed therebetween, and returns light that has not been directed to the ellipsoidal reflector 114 out of the light emitted from the arctube 112 to the arctube 112. To enter.

  As shown in FIG. 1D, the color wheel 130 is a disk-shaped member in which three transmissive color filters 132R, 132G, and 132B are formed in four fan-shaped regions partitioned along the rotation direction. is there. A motor 134 for rotating the color wheel 130 is disposed at the center of the color wheel 130.

  The color filter 132R transmits only red light components by transmitting light in the red wavelength region and reflecting or absorbing light in other wavelength regions in the illumination light flux from the light source device 110. Similarly, the color filters 132G and 132B transmit green light in the wavelength region of green or blue, and reflect or absorb light in other wavelength regions in the illumination light flux from the light source device 110, respectively. Only the component or the blue light component is transmitted. As the color filters 132R, 132G, and 132B, for example, a dielectric multilayer film, a filter plate formed using a paint, or the like can be suitably used. In the four fan-shaped regions, the portions other than the color filters 132R, 132G, and 132B are translucent regions 132W, and the illumination light flux from the light source device 110 can pass through as it is. The translucent area 132W can increase the brightness in the projected image and ensure the brightness of the projected image.

  Note that the color wheel 130 can be omitted, and the projected image in this case is a monochrome image.

The integrator rod 140A has a light incident surface 140A _i in the vicinity of the second focal point of the ellipsoidal reflector 114, and multi-reflects it on the inner surface of the integrator rod 140A, so that the illumination light flux from the color wheel 130 is more uniform in-plane light. An optical member having a function of converting into an illumination light beam having an intensity distribution. For example, a solid glass rod can be suitably used as the integrator rod 140A.

  The anamorphic lens 120A will be described later in detail.

  The relay optical system 300 includes a relay lens 310, a reflection mirror 320, and a condenser lens 330, and has a function of guiding an illumination light beam from the illumination device 100 to an image forming region of the micromirror light modulation device 400. ing.

  The relay lens 310 has a function of forming an image on the image forming region of the micromirror light modulator 400 without diverging the illumination light beam from the integrator rod 140 </ b> A together with the condenser lens 330. Note that the relay lens 310 illustrated in FIGS. 1A and 1B 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 320 is arranged to be inclined with respect to the illumination optical axis 100ax, bends the illumination light beam from the relay lens 310, and guides it to the micromirror light modulation device 400. Thereby, a projector can be made compact.

  The condensing lens 330 substantially superimposes the illumination light flux from the relay lens 310 and the reflection mirror 320 on the image forming area of the micromirror light modulator 400, and the light modulated by the micromirror light modulator 400 The projected optical system 600 is enlarged and projected.

The micromirror-type light modulation device 400 has a function of emitting image light representing an image to the projection optical system 600 by reflecting light from the relay optical system 300 with a micromirror corresponding to each pixel according to image information. Is a reflection direction control type light modulation device. As the micromirror type light modulation device 400, for example, DMD (digital micromirror device) (trademark of TI) can be used.
Further, as the micromirror type light modulation device 400, a micromirror type having an image forming region having a planar shape of “longitudinal dimension along the y-axis direction: lateral dimension along the x-axis direction = 3: 4 rectangle”. A light modulation device is used.

  The image light emitted from the micromirror light modulator 400 is enlarged and projected by the projection optical system 600 to form a large screen image on the screen SCR.

  The micromirror light modulator 400 and the projection optical system 600 are arranged so that their central axes coincide. When the projector 1000 according to the first embodiment is a projector having a tilting projection configuration, the projection optical axis 600ax of the projection optical system 600 is shifted in the tilting direction with respect to the central axis of the micromirror light modulator 400. It is preferable to configure as described above.

The illumination device 100 according to the first embodiment is characterized by including the shape of the light exit surface 140A _o (and the light incident surface 140A _i ) of the integrator rod 140A and the anamorphic lens 120A. Details will be described below.

FIG. 2 is a view for explaining the illumination device 100 according to the first embodiment. FIG. 2A is a diagram schematically showing an illumination light beam when the illumination device 100 is viewed from above, and FIG. 2B is a diagram schematically showing the illumination light beam when the illumination device 100 is viewed from the side. a diagram, FIG. 2 (c) is a diagram showing an in-plane light intensity distribution in the light incident surface 140A _i of the integrator rod 140A, FIG. 2 (d) in-plane light at the light exit surface 140A _o of the integrator rod 140A It is a figure which shows intensity distribution.

FIG. 3 is a view for explaining an illumination device 100a according to a comparative example of the first embodiment. FIG. 3A is a diagram schematically showing an illumination beam when the illumination device 100a is viewed from above, and FIG. 3B is a diagram schematically showing the illumination beam when the illumination device 100a is viewed from the side. a diagram, FIG. 3 (c) is a diagram showing an in-plane light intensity distribution in the light incident surface 140A _i of the integrator rod 140A, FIG. 3 (d) in-plane light at the light exit surface 140A _o of the integrator rod 140A It is a figure which shows intensity distribution.

  The illumination device 100a according to the comparative example of the first embodiment basically has the same configuration as that of the illumination device 100 according to the first embodiment, but the anamorphic lens 120A is interposed between the light source device 110 and the integrator rod 140A. Is different from the illumination device 100 according to the first embodiment in that the is not arranged.

Since the relationship between the conjugate to the image forming area of the light exit surface 140A _o and micromirror light modulator 400 of the integrator rod 140A, and the planar shapes of the image forming area of the light exit surface 140A _o of the integrator rod 140A The relationship is almost similar. Further, as described above, the aspect ratio of the image forming area in the micromirror light modulator 400 is 3: 4. For this reason, the aspect ratio of the light exit surface 140A _o (and the light incident surface 140A _i ) of the integrator rod 140A is also 3: 4.

That is, the light exit surface 140A _o (and the light incident surface 140A _i ) of the integrator rod 140A has two sides parallel to a first direction (hereinafter sometimes referred to as a y-axis direction) orthogonal to the illumination optical axis 100ax. It has two sides parallel to the illumination optical axis 100ax and a second direction (hereinafter sometimes referred to as x-axis direction) orthogonal to the first direction (y-axis direction), and is along the y-axis direction. The dimension is set to be shorter than the dimension along the x-axis direction.

According to the illumination device 100a according to the comparative example in which the anamorphic lens 120A is not disposed, the dimension along the y-axis direction and the dimension along the x-axis direction on the light exit surface 140A _o of the integrator rod 140A are different. There is a difference in the number of internal reflections between the illumination light beam incident from the direction shown in FIG. 3A and the illumination light beam incident from the direction shown in FIG. In other words, than the illumination light beam incident from the vertical direction to the light incident surface 140A _i of the integrator rod 140A (illumination light beam shown in FIG. 3 (b)), laterally with respect to the light incident surface 140A _i of the integrator rod 140A The incident illumination light beam (illumination light beam shown in FIG. 3A) has a smaller number of internal reflections, and as a result, the light uniformizing effect in the integrator rod 140A is weakened (see FIG. 3D). . For this reason, in order to obtain a predetermined light uniforming effect, it is necessary to increase the length of the integrator rod. As a result, it is not easy to downsize the lighting device.

  On the other hand, as shown in FIGS. 2A and 2B, the lighting device 100 according to the first embodiment includes an anamorphic lens 120A having a refractive power in the x-axis direction larger than that in the y-axis direction. It is characterized by providing. Specifically, in the illumination device 100 according to the first embodiment, a cylindrical lens having a positive refractive power in the x-axis direction and no refractive power in the y-axis direction is used as the anamorphic lens 120A (FIG. 1). (See (c).)

For this reason, according to the illuminating device 100 which concerns on Embodiment 1, as shown in FIG. 2, 140 A of light-projection surfaces which have the shape where the dimension along the y-axis direction was set shorter than the dimension along the x-axis direction. _{Since an} anamorphic lens 120A having a refractive power in the x-axis direction larger than that in the y-axis direction is disposed in the upstream of the optical path of the integrator rod 140A composed of _o, the illumination light beam incident from the x-axis direction (FIG. 2 (a ) Can be made larger than the incident angle of the illumination beam incident from the y-axis direction (the illumination beam shown in FIG. 2B). Therefore, the illumination light beam incident from the x-axis direction (the illumination light beam shown in FIG. 2A) is totally reflected at a deeper angle (with a reflection angle smaller than the reflection angle of the illumination light beam incident from the y-axis direction). However, since the light travels in the integrator rod 140A, the number of internal reflections is suppressed from being reduced compared to the illumination light beam incident from the y-axis direction, and the light uniformizing effect in the integrator rod 140A is weakened. It is suppressed. Further, the function of the anamorphic lens 120A described above, as shown in FIG. 2 (c), the size of the irradiated spot on the light incident surface 140A _i of the integrator rod 140A, can be increased along the x-axis direction.
As a result, as shown in FIG. 2D, the illumination light beam emitted from the illumination device 100 can be changed to an illumination light beam having a more uniform in-plane light intensity distribution.

  Moreover, according to the illuminating device 100 which concerns on Embodiment 1, the illumination light beam inject | emitted from the illuminating device 100 is made into the illumination light beam which has a more uniform in-plane light intensity distribution, without lengthening the length of the integrator rod 140A. Therefore, the lighting device 100 can be easily downsized.

  For this reason, the illuminating device 100 which concerns on Embodiment 1 can make the illumination light beam inject | emitted from the illuminating device 100 into the illumination light beam which has a more uniform in-plane light intensity distribution, aiming at size reduction of the illuminating device 100. FIG. Lighting device.

  In the illumination device 100 according to the first embodiment, the anamorphic lens 120A and the integrator rod 140A are spaced apart from each other, so that the position adjustment between the anamorphic lens 120A and the integrator rod 140A can be easily performed. Become. Further, since the anamorphic lens 120A and the integrator rod 140A are arranged apart from each other, the thermal influence can be reduced.

In the illumination device 100 according to the first embodiment, the light incident surface 120A _i and the light exit surface 120A _o of the anamorphic lens 120A and the light incident surface 140A _i of the integrator rod 140A are coated with the anti-reflection film. It is possible to suppress the generation of unnecessary reflection in the illumination luminous flux output from the light exit surface 120A _o of the illumination light beam and the anamorphic lens 120A is incident on the light incident surface 140A _i of the light incident surface 120A _i and integrator rod 140A of the lens 120A it can.

  In addition, the projector 1000 according to the first embodiment includes the above-described illumination device 100, a micromirror light modulation device 400 that modulates an illumination light beam from the illumination device 100 according to image information, and a micromirror light modulation device 400. And a projection optical system 600 that projects the modulated light.

  For this reason, since the projector 1000 according to the first embodiment includes the excellent illumination device 100 as described above, the brightness of the image projected on the screen SCR is made more uniform while the projector 1000 is downsized. It becomes the projector which can do.

[Embodiment 2]
In describing the characteristics of the illumination device 102 and the projector 1002 according to the second embodiment, first, the configurations of the illumination device 102 and the projector 1002 will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a diagram for explaining the illumination device 102 and the projector 1002 according to the second embodiment. 4A is a diagram of the optical system of the projector 1002 as viewed from above, FIG. 4B is a diagram of the optical system of the projector 1002 as viewed from the side, and FIG. 4C is a diagram of the anamorphic lens 120B. It is a perspective view. In FIG. 4B, the illustration of the optical system disposed downstream of the optical path with respect to the relay lens 340 is omitted.

FIG. 5 is a diagram for explaining the illumination device 102 according to the second embodiment. FIG. 5A is a perspective view of the integrator rod 140B, the polarization conversion element 150A, and the light guide member 160A that constitute the illumination device 102, and FIG. 5B illustrates the functions of the polarization conversion element 150A and the light guide member 160A. a view for FIG. 5 (c) is a diagram showing an in-plane light intensity distribution in the light incident surface 140B _i of the integrator rod 140B, FIG. 5 (d) is the light exit surface 160A of the light guide member 160A It is a figure which shows in-plane light intensity distribution in _o .

  As shown in FIGS. 4A and 4B, the projector 1002 according to the second embodiment includes an illumination device 102 that emits an illumination light beam, and a relay lens 340 that guides light from the illumination device 102 to an illuminated area. The color separation light guide optical system 200 that separates the light from the relay lens 340 into three color lights and guides the light to the illuminated area, and the three color lights separated by the color separation light guide optical system 200 are images. Three transmissive liquid crystal devices 410R, 410G, and 410B as electro-optic modulation devices that modulate in accordance with information, and a cross dichroic prism as a color combining optical system that combines color lights modulated by the liquid crystal devices 410R, 410G, and 410B 500 and a projection optical system 610 that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. It is obtain projector.

  The illumination device 102 according to the second embodiment includes a light source device 110 that emits an illumination light beam, an integrator rod 140B that converts the illumination light beam from the light source device 110 into an illumination light beam having a more uniform in-plane light intensity distribution, and an integrator rod. It is an illuminating device including a polarization conversion element 150A that aligns an illumination light beam emitted from 140B with a non-uniform polarization direction into substantially one type of linearly polarized light. The illumination device 102 further includes an anamorphic lens 120B disposed between the light source device 110 and the integrator rod 140B, and a light guide member 160A disposed downstream of the optical path of the polarization conversion element 150A.

  Since the light source device 110 is the same as that described in the first embodiment, the description thereof is omitted.

Integrator rod 140B has a light incident surface 140B _i to the second focal point of the ellipsoidal reflector 114, by multiple reflections on the inner surface of the integrator rod 140B, more uniform plane illumination light beam from the light source device 110 An optical member having a function of converting into an illumination light beam having an intensity distribution. For example, a solid glass rod can be suitably used as the integrator rod 140B.

The polarization conversion element 150A is a polarization conversion element that emits the polarization direction of the illumination light beam from the integrator rod 140B as approximately one type of linearly polarized light having a uniform polarization direction.
As shown in FIG. 5B, the polarization conversion element 150A transmits one linearly polarized component (P-polarized component) as it is among the polarized components included in the illumination light beam from the light source device 110, and the other linearly polarized component. A polarization separation layer 152A that reflects (S-polarized component) in a direction perpendicular to the illumination optical axis 100ax, and a direction in which the other linearly polarized component (S-polarized component) reflected by the polarization separation layer 152A is parallel to the illumination optical axis 100ax. And a λ / 2 plate 156A that converts one linearly polarized component (P-polarized component) transmitted through the polarization separation layer 152A into the other linearly polarized component (S-polarized component). .

  The light guide member 160A is an optical element having a function of making the in-plane light intensity distribution uniform in the illumination light beam from the polarization conversion element 150A. The light guide member 160A is a solid light guide member. For example, a solid optical block of a total internal reflection type can be suitably used.

  The anamorphic lens 120B will be described later in detail.

  The relay lens 340 has a function of forming an image on an image forming area of the liquid crystal devices 410R, 410G, and 410B without diverging the illumination light beam from the illumination device 102 together with condenser lenses 280R, 280G, and 280B described later. Yes. Note that the relay lens 340 illustrated in FIGS. 4A and 4B is configured by a single lens, but may be configured by a composite lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes a first dichroic mirror 210 and a second dichroic mirror 220, reflection mirrors 230, 240, 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light beam emitted from the relay lens 340 into three color lights of red light, green light, and blue light, and the three liquid crystal devices 410R that are the illumination targets. , 410G, 410B.

  The first dichroic mirror 210 and the second dichroic mirror 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 first dichroic mirror 210 is a mirror that reflects a red light component and transmits other color light components. The second dichroic mirror 220 is a mirror that transmits a blue light component and reflects a green light component.

  The red light component reflected by the first dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 410R for red light via the condenser lens 280R.

  The condensing lens 280R substantially superimposes the illumination light beam from the relay lens 340 on the image forming area of the liquid crystal device 410R. The condensing lenses 280G and 280B disposed in the preceding stage of the optical path of the other liquid crystal devices 410G and 410B are configured in the same manner as the condensing lens 280R.

  The green light component out of the green light component and the blue light component that has passed through the first dichroic mirror 210 is reflected by the second dichroic mirror 220, passes through the condenser lens 280G, and the image forming area of the liquid crystal device 410G for green light Illuminate. On the other hand, the blue light component passes through the second dichroic mirror 220 and passes through the incident side lens 260, the incident side reflection mirror 240, the relay lens 270, the emission side reflection mirror 250, and the condensing lens 280B. The image forming area of the liquid crystal device 410B is illuminated. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the second dichroic mirror 220 to the liquid crystal device 410B.

  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 1002 according to the second embodiment has such a configuration because the length of the optical path of the blue light is long. However, the length of the optical path of the 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 410R, 410G, and 410B modulate the illumination light beam according to the image information to form a color image, and are the illumination target of the light source device 110. Although not shown, incident side polarizing plates are interposed between the condenser lenses 280R, 280G, and 280B and the liquid crystal devices 410R, 410G, and 410B, and the liquid crystal devices 410R, 410G, and 410B, Between the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 410R, 410G, and 410B and the exit-side polarizing plate modulate light of each incident color light.
The liquid crystal devices 410R, 410G, and 410B are obtained by hermetically sealing a liquid crystal that is an electro-optical material on a pair of transparent glass substrates. For example, using a polysilicon TFT as a switching element, the polarization direction of one type of linearly polarized light emitted from the incident side polarizing plate is modulated in accordance with given image information.
As the liquid crystals 410R, 410G, and 410B, a liquid crystal device having an image forming region having a planar shape of “longitudinal dimension along the y-axis direction: lateral dimension along the x-axis direction = 3: 4 rectangle” is used. .

  The cross dichroic prism 500 as a color synthesis optical system is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission 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. The dielectric multilayer film formed at one interface having a substantially X shape reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. Red light and blue light are bent by the dielectric multilayer film and aligned with the traveling direction of green light, so that three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 610 to form a large screen image on the screen SCR.

The illumination device 102 according to the second embodiment is characterized by including the shape of the light exit surface 140B _o (and the light incident surface 140B _i ) of the integrator rod 140B and the anamorphic lens 120B. Details will be described below.

Light guide member 160A of the light exit surface 160A _o and each of the liquid crystal device 410R, 410G, since a relationship of conjugate and 410B image forming area of the planar shape and the image forming area of the light exit surface 160A _o of the light guide member 160A The shape is substantially similar. As described above, the aspect ratio of the image forming area in each of the liquid crystal devices 410R, 410G, and 410B is 3: 4. Therefore, the aspect ratio of the light exit surface 160A _o of the light guide member 160A is also 3: 4 (FIG. 5 (d) see.).

Here, in the illumination device 102 according to the second embodiment, as can be seen from FIGS. 5A and 5B, the dimension along the y-axis direction on the light exit surface 140Bo of the integrator rod 140B is polarized light. is substantially equal to the dimension along the y-axis direction in the conversion element 150A, the dimension along the x-axis direction in the light exit plane 140B _o of the integrator rod 140B is approximately the dimension along the x-axis direction in the polarization conversion element 150A It is half. The dimension along the y-axis direction of the polarization conversion element 150A is substantially the same as the dimension along the y-axis direction of the light guide member 160A, and the dimension along the x-axis direction of the polarization conversion element 150A is the light guide. The dimension of the member 160A is substantially the same as the dimension along the x-axis direction. That is, the dimension along the y-axis direction of the light exit surface 140Bo of the integrator rod 140B is substantially the same as the dimension along the y-axis direction of the polarization conversion element 150A and the light guide member 160A. Further, the dimension along the x-axis direction in the light exit plane 140B _o of the integrator rod 140B is approximately half the dimension along the x-axis direction in the polarization conversion element 150A and the light guide member 160A. For this reason, the aspect ratio of the light exit surface 140B _o (and the light incident surface 140B _i ) of the integrator rod 140B is 3: 2.

That is, the light exit surface 140B _o (and the light incident surface 140B _i ) of the integrator rod 140B has two sides parallel to the y-axis direction and the x-axis direction, as shown in FIGS. 5 (a) and 5 (c). And has a shape in which the dimension along the y-axis direction is set longer than the dimension along the x-axis direction.

For this reason, according to the illuminating device 102 which concerns on Embodiment 2, as shown in FIG. 5, the light-projection surface 140B which has the shape where the dimension along the y-axis direction was set longer than the dimension along the x-axis direction. _An anamorphic lens 120B in which the refractive power in the y-axis direction is larger than the refractive power in the x-axis direction (an anamorphic lens 120B has a positive refractive power in the y-axis direction and has an x-axis in front of the optical path of the integrator rod 140B made of _o). Since a cylindrical lens having no refracting power in the direction is used (see FIG. 4C)), the illumination light beam incident from the y-axis direction (the illumination light beam shown in FIG. 4B) Can be made larger than the incident angle of the illumination light beam (illumination light beam shown in FIG. 4A) incident from the x-axis direction. Therefore, the illumination light beam incident from the y-axis direction (the illumination light beam shown in FIG. 4B) is totally reflected at a deeper angle (with a reflection angle smaller than the reflection angle of the illumination light beam incident from the x-axis direction). However, since the light travels in the integrator rod 140B, the number of internal reflections is suppressed from being reduced compared to the illumination light beam incident from the x-axis direction, and the light uniformizing effect in the integrator rod 140B is weakened. It is suppressed. Further, the function of the anamorphic lens 120B described above, as shown in FIG. 5 (c), the size of the irradiated spot on the light incident surface 140B _i of the integrator rod 140B, can be increased along the y-axis direction.
As a result, as shown in FIG. 5D, the illumination light beam emitted from the illumination device 102 can be changed to an illumination light beam having a more uniform in-plane light intensity distribution.

  Further, according to the illumination device 102 according to the second embodiment, the illumination light beam emitted from the illumination device 102 is converted into an illumination light beam having a more uniform in-plane light intensity distribution without increasing the length of the integrator rod 140B. Therefore, the lighting device 102 can be easily downsized.

  For this reason, the illuminating device 102 according to the second embodiment, as in the case of the illuminating device 100 according to the first embodiment, makes the illumination light beam emitted from the illuminating device 100 more uniform while reducing the size of the illuminating device 102. It becomes an illuminating device which can be made into the illumination light beam which has in-plane light intensity distribution.

  The projector 1002 according to the second embodiment includes the above-described illumination device 102, the liquid crystal devices 410R, 410G, and 410B that modulate the illumination light flux from the illumination device 102 according to image information, and the liquid crystal devices 410R, 410G, and 410B. And a projection optical system 610 that projects the modulated light.

  For this reason, since the projector 1002 according to the second embodiment includes the excellent illumination device 102 as described above, the screen of the projector 1002 can be reduced in size as in the case of the projector 1000 according to the first embodiment. The projector can make the brightness of the image projected on the SCR more uniform.

As described above, the shape of the light emission surface 140B _o (and the light incident surface 140B _i ) of the integrator rod 140B and the anamorphic lens 120B in the illumination device 102 according to the second embodiment have been described in detail. In the illumination device 102 according to the second embodiment, Has the following characteristics.

In the illumination device 102 according to the second embodiment, the dimension along the y-axis direction of the light exit surface 140Bo of the integrator rod 140B is substantially the same as the dimension along the y-axis direction of the polarization conversion element 150A. the dimension along the x-axis direction in the light exit surface 140B _o is substantially the half of the dimension along the x-axis direction in the polarization conversion element 150A, the illumination light beams from the integrator rod 140B is effectively the polarization converter 150A It is suppressed as much as possible that it is incident on the polarization separation layer 152 and decreases the light use efficiency.

In the illumination device 102 according to the second embodiment, the light exit surface 140B _o of the integrator rod 140B, the light incident surface 150A _i of the polarization conversion element 150A, the light exit surface 150A _o of the polarization conversion element 150A, and the light incidence of the light guide member 160A. Since the surfaces 160A _i are bonded through the adhesive C, undesirable multiple reflections among the integrator rod 140B, the polarization conversion element 150A, and the light guide member 160A are suppressed, and the light use efficiency is reduced. The stray light level will not increase. Further, the integrator rod 140B, the polarization conversion element 150A, and the light guide member 160A can be easily integrated. In addition, it is possible to prevent the occurrence of positional deviation after assembly of the device among the integrator rod 140B, the polarization conversion element 150A, and the light guide member 160A.

  As the adhesive C, an adhesive having substantially the same refractive index as that of the integrator rod 140B, the polarization conversion element 150A, and the light guide member 160A is used.

  The illuminating device 102 according to the second embodiment further includes a light guide member 160A that is disposed downstream of the optical path of the polarization conversion element 150A and has a function of equalizing the in-plane light intensity distribution of the illumination light beam from the polarization conversion element 150A. Therefore, the in-plane light intensity distribution of the illumination light beam emitted from the polarization conversion element 150A can be made more uniform.

  In the illumination device 102 according to the second embodiment, the solid light guide member 160A is used as the light guide member. However, the present invention is not limited to this, and for example, the following modifications are possible. Is also possible.

[Modification 1]
FIG. 6 is a view for explaining an illumination device 102b according to the first modification of the second embodiment. In FIG. 6, the same members as those in FIG. 5B are denoted by the same reference numerals, and detailed description thereof is omitted.

As illustrated in FIG. 6, the lighting device 102b (not shown) according to the first modification of the second embodiment uses a hollow light guide member 160B as the light guide member.
The light guide member 160B is an optical element having a function of making the in-plane light intensity distribution uniform in the illumination light flux from the polarization conversion element 150A. As the light guide member 160B, for example, a cylindrical light tunnel in which the reflection surfaces of four reflection mirrors are bonded inward can be suitably used. In this case, the light exit surface 160Bo of the light guide member 160B and the image forming areas of the liquid crystal devices 410R, 410G, and 410B have a conjugate relationship.

  In addition, since it is the same as that of the illuminating device 102 which concerns on Embodiment 2 about structures other than the light guide member 160B, detailed description is abbreviate | omitted.

  As described above, the illumination device 102b according to the first modification of the second embodiment is different from the illumination device 102 according to the second embodiment in that a hollow light guide member 160B is used as the light guide member. As in the case of the illumination device 102 according to the second embodiment, the in-plane light intensity distribution of the illumination light beam emitted from the polarization conversion element 150A can be made more uniform.

  In the illumination device 102 according to the second embodiment, the polarization conversion element 150A includes a rectangular prism in which the polarization separation layer 152A is disposed and a rectangular prism in which the reflection layer 154A is disposed. However, the present invention is not limited to this, and for example, the following modifications are possible.

[Modification 2]
FIG. 7 is a diagram for explaining an illumination device 102c according to the second modification of the second embodiment. In FIG. 7, the same members as those in FIG. 5B are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, in the illumination device 102c (not shown) according to the second modification of the second embodiment, the polarization conversion element 150B includes a rectangular parallelepiped prism in which a polarization separation layer 152B is disposed, and an outer surface 1. And a triangular prism having a total reflection film 154B disposed thereon.

  In addition, since it is the same as that of the illuminating device 102 which concerns on Embodiment 2 about structures other than the polarization conversion element 150B, detailed description is abbreviate | omitted.

  As described above, the illumination device 102c according to the second modification of the second embodiment is different from the illumination device 102 according to the second embodiment in the configuration of the polarization conversion element, but the illumination device 102 according to the second embodiment. Similarly, the polarization direction of the illumination light beam from the integrator rod 140B can be emitted as approximately one type of linearly polarized light having the same polarization direction.

  As mentioned above, although the illuminating device and projector of this invention were demonstrated based on said each embodiment, this invention is not limited to said each embodiment, In the range which does not deviate from the summary, it implements in various aspects. For example, the following modifications are possible.

(1) In the illumination device 100 according to the first embodiment, the anamorphic lens 120A having a refractive power in the x-axis direction larger than that in the y-axis direction has a positive refractive power in the x-axis direction and the y-axis direction. However, the present invention is not limited to this. For example, a toric lens (toroidal lens) in which the refractive power in the x-axis direction is larger than the refractive power in the y-axis direction is used. Etc. may be used.
In the illumination device 102 according to the second embodiment, the anamorphic lens 120B having a refractive power in the y-axis direction larger than that in the x-axis direction has a positive refractive power in the y-axis direction and is in the x-axis direction. Although a cylindrical lens having no refractive power is used, the present invention is not limited to this. For example, a toric lens (toroidal lens) whose refractive power in the y-axis direction is larger than that in the x-axis direction, etc. May be used.

(2) Although the anamorphic lenses 120A and 120B and the integrator rods 140A and 140B are spaced apart from each other in the illumination devices 100 and 102 of the above embodiments, the present invention is not limited to this. The anamorphic lens and the integrator rod may be integrally formed, or the light emitting surface of the anamorphic lens and the light incident surface of the integrator rod may be bonded. When the light emitting surface of the anamorphic lens and the light incident surface of the integrator rod are bonded, it is preferable to use an adhesive having substantially the same refractive index as that of the anamorphic lens and the integrator rod.

(3) In the projector 1000 according to the first embodiment, the electro-optic modulation device has a planar shape of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 3: 4 rectangle”. Although the micromirror type light modulation device 400 having an image forming area is used, the present invention is not limited to this. “Vertical dimension along the y-axis direction: Lateral dimension along the x-axis direction = 9” A micromirror light modulator having an image forming region having a planar shape of “16: rectangle” may be used. In this case, the shape of the light exit surface (light incident surface) of the integrator rod is preferably substantially similar to the planar shape of the image forming region. That is, it is preferable that the aspect ratio of the light exit surface (light incident surface) of the integrator rod is 9:16.

(4) The projector 1002 according to the second embodiment has a planar shape of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 3: 4 rectangle” as the electro-optic modulation device. Although the liquid crystal devices 410R, 410G, and 410B having the image forming area are used, the present invention is not limited to this. “Vertical dimension along the y-axis direction: Horizontal dimension along the x-axis direction = 9” A liquid crystal device having an image forming region having a planar shape of “16: rectangle” may be used. In this case, the shape of the light emitting surface (light incident surface) of the integrator rod is “a dimension along the y-axis direction with respect to the shape of the light emitting surface of the light guide member that is substantially similar to the planar shape of the image forming region. Are substantially the same, and are preferably “rectangles whose dimensions along the x-axis direction are approximately half”. That is, it is preferable that the aspect ratio of the light exit surface (light incident surface) of the integrator rod is 9: 8.

(5) In the illuminating devices 100 and 102 of each of the embodiments described above, a solid glass rod with internal total reflection type is used as the integrator rods 140A and 140B, 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.

(6) The projector 1002 according to the second embodiment is a transmissive projector, but 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.

(7) The projector 1000 according to the first embodiment is a so-called single-plate projector including one micromirror light modulator, but the present invention is not limited to this, and two or more projectors are provided. It is also possible to apply the present invention to a projector including the micromirror type light modulation device. The projector 1002 according to the second embodiment is a so-called three-plate projector including the three liquid crystal devices 410R, 410G, and 410B. However, the present invention is not limited to this, and one, two, or The present invention can be applied to a projector including four or more liquid crystal devices.

(8) In the illuminating devices 100 and 102 of each of the embodiments described above, the illuminating device in which the auxiliary mirror 116 as the reflecting means is disposed on the arc tube 112 is described as an example, but the present invention is limited to this. However, the present invention can be applied to a lighting device in which an auxiliary mirror is not provided.

(9) In the projector 1000 according to the first embodiment, the color wheel 130 is arranged on the light incident side of the integrator rod 140A, but the present invention is not limited to this, and the light emitting side of the integrator rod A color wheel may be arranged.

(10) In addition, it can be said that the present invention can be applied to a front projection projector that projects from the side that observes the projected image and a rear projection projector that projects from the side opposite to the side that observes the projected image. Not too long.

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 illuminating device 100 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the illuminating device 100a which concerns on the comparative example of Embodiment 1. FIG. FIG. 6 is a diagram for explaining an illumination device 102 and a projector 1002 according to a second embodiment. The figure shown in order to demonstrate the illuminating device 102 which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the illuminating device 102b which concerns on the modification 1 of Embodiment 2. FIG. The figure shown in order to demonstrate the illuminating device 102c which concerns on the modification 2 of Embodiment 2. FIG. The figure shown in order to demonstrate the problem in the conventional illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, 100a, 102 ... Illuminating device, 100ax ... Illumination optical axis, 110 ... Light source device, 112 ... Light emission tube, 114 ... Ellipsoidal reflector, 116 ... Auxiliary mirror, 120A, 120B ... Anamorphic lens, 130 ... Color wheel, 132R, 132G, 132B ... color filter, 132W ... translucent regions, 134 ... motor, 140A, 140B, 940 ... integrator _{rod, 140A i, 140B i, 940} i ... ( of the integrator rod) light incident _surface, 140A o, 140B _o, 940 _o ... light exit surface (of the integrator rod), 150A, 150B ... polarization conversion element, 150A _i , 150B _i ... light entrance surface (of the polarization conversion element), 150A _o , 150B _o ... light exit (of the polarization conversion element) Surface, 152A, 152B ... polarization separation layer, 154 ... reflective layer, 154B ... total reflection film, 156A, 156B ... λ / 2 plate, 160A, 160B ... light guide _member, 160A i, (light guide member) 160B _i ... light incident _surface, 160A _o, 160B o ... ( Light exit surface (of light guide member), 200 ... color separation light guide optical system, 210 ... first dichroic mirror, 220 ... second dichroic mirror, 230, 240, 250, 320 ... reflection mirror, 260 ... incident side lens, 270 , 310, 340 ... Relay lens, 280R, 280G, 280B, 330 ... Condensing lens, 300 ... Relay optical system, 400 ... Micromirror light modulator, 410R, 410G, 410B ... Liquid crystal device, 500 ... Cross dichroic prism, 600, 610 ... projection optical system, 600ax ... projection optical axis, 1000, 1002 ... projector, BS ... Color wheel irradiated spot, C ... adhesives, P ... P-polarized light component, S ... S-polarized light component, SCR ... screen

Claims (12)

A light source device that emits a convergent illumination light beam to the illuminated region side;
An illumination device comprising an integrator rod for converting an illumination light beam from the light source device into an illumination light beam having a more uniform in-plane light intensity distribution,
The light exit surface of the integrator rod has two sides parallel to the first direction orthogonal to the illumination optical axis and two sides parallel to the illumination optical axis and the second direction orthogonal to the first direction. And the dimension along the first direction is set shorter than the dimension along the second direction,
An illumination device, further comprising an anamorphic lens disposed between the light source device and the integrator rod and having a refractive power in the second direction larger than a refractive power in the first direction. A light source device that emits a convergent illumination light beam to the illuminated region side;
An integrator rod for converting an illumination light beam from the light source device into an illumination light beam having a more uniform in-plane light intensity distribution;
A polarization separation layer that transmits an illumination light beam related to one linearly polarized light component and reflects an illumination light beam related to the other linearly polarized light component among the illumination light beams from the integrator rod, and the other linearly polarized light component from the polarized light separated layer A reflective layer that reflects the illumination light beam in a direction parallel to the illumination optical axis, and a portion through which the illumination light beam related to one linearly polarized light component transmitted through the polarization separation layer passes or the other reflected by the reflection layer A polarization conversion element having a λ / 2 plate disposed in any of the portions through which the illumination light beam related to the linearly polarized light component passes,
The light exit surface of the integrator rod has two sides parallel to the first direction orthogonal to the illumination optical axis and two sides parallel to the illumination optical axis and the second direction orthogonal to the first direction. And the dimension along the first direction is set longer than the dimension along the second direction,
An illumination device, further comprising an anamorphic lens disposed between the light source device and the integrator rod and having a refractive power in the first direction larger than a refractive power in the second direction. The lighting device according to claim 2,
The dimension along the first direction of the light exit surface of the integrator rod is substantially the same as the dimension along the first direction of the polarization conversion element,
The illumination device according to claim 1, wherein a dimension along the second direction of the light exit surface of the integrator rod is substantially half of a dimension along the second direction of the polarization conversion element. The lighting device according to claim 2 or 3,
An illumination device, wherein a light exit surface of the integrator rod and a light incident surface of the polarization conversion element are bonded. In the illuminating device in any one of Claims 2-4,
An illuminating device further comprising a light guide member that is disposed downstream of the optical path of the polarization conversion element and has a function of uniformizing an in-plane light intensity distribution of an illumination light beam from the polarization conversion element. The lighting device according to claim 5.
The illumination device according to claim 1, wherein the light guide member is a hollow light guide member. The lighting device according to claim 5.
The illumination device according to claim 1, wherein the light guide member is a solid light guide member. The lighting device according to claim 7.
The light emitting surface of the said polarization conversion element and the light-incidence surface of the said light guide member are adhere | attached, The illuminating device characterized by the above-mentioned. In the illuminating device in any one of Claims 1-8,
The anamorphic lens and the integrator rod are arranged separately from each other. In the illuminating device in any one of Claims 1-8,
An illumination device, wherein a light emission surface of the anamorphic lens and a light incidence surface of the integrator rod are bonded. In the illuminating device in any one of Claims 1-8,
The lighting device, wherein the anamorphic lens and the integrator rod are integrally formed. The lighting device according to any one of claims 1 to 11,
An electro-optic modulation device that modulates illumination light flux 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.