JP2006154782A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector of which the light application efficiency is not sharply reduced even when smooth and fine moving images can be displayed. <P>SOLUTION: The projector provided with an illumination device 100, liquid crystal devices 400R, 400G, 400B and a projecting optical system 600 is also provided with a mode selecting device for selecting mode used for driving, a normal mode or a persistence-of-vision-relaxed mode, and a rotary prism 770 for scanning an image forming region of the liquid crystal device with an illuminating light beam along the other direction synchronously with the screen writing frequency of the liquid crystal device when the mode selection device selects the persistence-of-vision-relaxed mode. The illumination device 100 comprises a lens integrator 120b for the normal mode which is inserted into the optical path of an illuminating light beam when the normal mode is selected and an integrator 120a for the persistence-of-vision-relaxed mode which is inserted into the optical path of the illuminating light beam when the persistence-of-vision-relaxed mode is selected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector.

FIG. 10 is a diagram for explaining a conventional projector. FIG. 10A is a diagram showing an optical system of a conventional projector, and FIGS. 10B and 10C are diagrams for explaining the problems of such a conventional projector.
In the projector 900A, since the liquid crystal devices 400R, 400G, and 400B used as the electro-optic modulation device are hold type display devices having luminance characteristics as shown in FIG. 10B, they are shown in FIG. Unlike the case of the CRT which is an impulse type display device having such luminance characteristics, there is a problem that a smooth moving image display cannot be obtained due to a so-called tailing phenomenon. (Refer nonpatent literature 1.).

FIG. 11 is a diagram for explaining another conventional projector. FIG. 11A is a diagram showing an optical system of another conventional projector, and FIGS. 11B and 11C are diagrams for showing an optical shutter used in such another conventional projector. It is.
In the projector 900B, as shown in FIG. 11A, optical shutters 420R, 420G, and 420B are arranged on the light incident side of the liquid crystal devices 400R, 400G, and 400B, and light is intermittently blocked by these optical shutters. This solves the problem described above. That is, the so-called tailing phenomenon is alleviated so that a smooth and high-quality moving image display can be obtained (for example, see Patent Document 1).
"Image quality of video display on hold type display" (Technical Report of IEICE, EID99-10, pages 55-60 (1999-06)) JP 2002-148712 A (FIGS. 1 to 7)

  However, in such other conventional projectors, there is a problem in that the light use efficiency is significantly reduced because light is intermittently blocked by the optical shutter.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a projector in which the light use efficiency is not significantly reduced even when a smooth and high-quality moving image display is obtained. And

  The projector according to the present invention includes a light source device that emits a substantially parallel illumination light beam toward the illuminated region side, and a plurality of first small lenses that divide the illumination light beam emitted from the light source device into a plurality of partial light beams. A lens integrator having a second lens array having a first lens array and a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array, and each partial light beam emitted from the lens integrator An illuminating device having a superimposing lens for superimposing in an illuminated area, an electro-optic modulation device that modulates an illumination light beam emitted from the illuminating device according to image information, and illumination modulated by the electro-optic modulation device A projector having a projection optical system for projecting a light beam, wherein the electro-optic modulator has an image forming area in any of vertical and horizontal directions. The normal mode for illuminating the entire image forming area with respect to the direction, and the entire image forming area in one of the vertical and horizontal directions in the image forming area of the electro-optic modulator, and the image forming area in the other direction A mode selection device that selects which mode to operate in a tailing relaxation mode that illuminates a part of the screen, and a screen of the electro-optic modulation device when the tailing relaxation mode is selected by the mode selection device Scanning means for scanning the illumination light beam along the other direction on the image forming region of the electro-optic modulation device in synchronization with the writing frequency, and the illumination device is the mode integrator as the lens integrator. A normal mode lens integrator that is inserted into the optical path of the illumination light beam when the normal mode is selected, and the mode selection device. And a tail relaxation mode lens integrator that is inserted into the optical path of the illumination light beam when the tail relaxation mode is selected. In the normal mode lens integrator, each first small array in the first lens array The lens includes an illumination light beam having a cross-sectional shape that illuminates the illumination light beam emitted from the illumination device with respect to the entire image formation region in any of vertical and horizontal directions in the image formation region of the electro-optic modulation device. As described above, each of the first small lenses in the first lens array has a planar shape similar to the image forming region of the electro-optic modulation device. The illumination light beam emitted is image forming area in the one direction in the image forming area of the electro-optic modulator. In the other direction, it has a planar shape compressed in the other direction so as to be an illumination light beam having a cross-sectional shape that illuminates a part of the image forming region.

  For this reason, in the projector of the present invention, when the tailing relaxation mode is selected by the mode selection device, the tailing relaxation mode lens integrator is inserted in the optical path of the illumination light beam, and the scanning unit performs a predetermined operation. It becomes like this. As a result, according to the projector of the present invention, the entire image forming area is illuminated in one of the vertical and horizontal directions in the image forming area of the electro-optic modulator, and a part of the image forming area is illuminated in the other direction. The illumination light beam having such a cross-sectional shape (that is, a cross-sectional shape compressed in the other direction) can be scanned along the other direction on the image forming region in synchronization with the screen writing frequency of the electro-optic modulator. Therefore, in the image forming area of the electro-optic modulation device, the light irradiation area and the light non-irradiation area are sequentially scrolled alternately. As a result, the tailing phenomenon is alleviated and a smooth and high-quality moving image display can be obtained.

  Further, according to the projector of the present invention, the illumination light beam having the cross-sectional shape compressed in the other direction as described above is used as the lens integrator, and the first lens array is obtained by compressing the planar shape of the first small lens in the other direction. Unlike the case where an optical shutter is used, the illumination light beam emitted from the light source device can be guided to the image forming area of the electro-optic modulation device without waste because it is realized by using the lens integrator for the trailing relaxation mode. As a result, the light use efficiency is not significantly reduced.

  For this reason, the projector of the present invention is a projector in which the light use efficiency is not significantly reduced even when smooth and high-quality moving image display is obtained, and the object of the present invention is achieved.

  In the projector of the present invention, the mode selection device may select whether to operate the projector in the normal mode or the tailing alleviation mode according to a user's operation, or to display the mode selection device. The content of the content to be detected may be detected, and whether to operate the projector in the normal mode or the tailing relaxation mode based on the content of the detected content may be automatically selected.

  In the projector according to the aspect of the invention, the length along the one direction of the first small lens in the tailing relaxation mode lens integrator may be along the one direction of the first small lens in the normal mode lens integrator. The length along the other direction of the first small lens in the tail relaxation mode lens integrator is along the other direction of the first small lens in the normal mode lens integrator. It is preferable that the length is shorter than the length.

  In the projector according to the aspect of the invention, the number of the first small lenses arranged in the one direction in the tail relaxation mode lens integrator may be in the one direction in the first small lens in the normal mode lens integrator. The number of arrangements along the other direction of the first small lens in the tail relaxation mode lens integrator is the same as the number of arrangements in the other direction of the first small lens in the normal mode lens integrator. More than the number of sequences along.

  In the projector according to the aspect of the invention, it is preferable that an outer diameter size of the first lens array in the tail relaxation mode lens integrator is the same as an outer diameter size of the first lens array in the normal mode lens integrator. .

  In the projector according to the aspect of the invention, it is preferable that a focal length of the first small lens in the tail relaxation mode lens integrator is the same as a focal length of the first small lens in the normal mode lens integrator. .

  With this configuration, when switching between the normal mode and the tailing relaxation mode, it is only necessary to replace the normal mode lens integrator and the tailing relaxation mode lens integrator as they are. The mechanism for replacing the pulling relaxation mode lens integrator can be made extremely simple.

In the projector according to the aspect of the invention, in the first lens array in the normal mode lens integrator and the first lens array in the trailing relaxation mode lens integrator, the first small lenses may be arranged in four rows in the one direction. It is preferable that they are arranged.
With this configuration, the lens density of the first small lenses in the first lens array is lower than in the case of the conventional projector, and the size of the first small lenses can be made sufficiently large. become. For this reason, the length of the side along the other direction of the 1st small lens in the 1st lens array does not become extremely short. As a result, the image of each first small lens in the first lens array can be satisfactorily swallowed by each second small lens in the corresponding second lens array, and good light utilization efficiency can be obtained.

  In this case, when the first lens array in the normal mode lens integrator and the first lens array in the tail relaxation mode lens integrator are respectively inserted in the optical path of the illumination light flux, It is preferable to have a light incident surface on the ellipsoidal reflector side from the two focal points, and to be arranged at a position on the light incident surface such that the amount of illumination light beam emitted from the light source device is distributed over the entire surface.

  With this configuration, the amount of illumination light beam emitted from the light source device is distributed over the entire light incident surface of the first lens array. Therefore, even if the first lens array is arranged in four rows in one direction to form a first lens array having a relatively low lens density, the in-plane light intensity distribution characteristic on the image forming region of the electro-optic modulation device is obtained. Thus, the manufacturing process in the first lens array can be simplified and the cost can be reduced.

  Also, in this case, the first lens array in the normal mode lens integrator and the first lens array in the trailing relaxation mode lens integrator are inserted into the optical path of the illumination light beam, respectively. It is preferable to arrange the first lens array at a position where there is no extremely small area of incident light intensity (so-called shadow area of the arc tube) in the center of the light incident surface of the array. With this configuration, the amount of illumination light beam emitted from the light source device is distributed over the entire light incident surface of the first lens array.

  As for the electro-optic modulation device of the projector, the planar shape of the image forming region is “rectangular with vertical dimension: horizontal dimension = 3: 4” and “rectangular with vertical dimension: horizontal dimension = 9: 16”. Is widely used, the planar shape of each first small lens of the first lens array in the lens integrator for the normal mode is, for example, “rectangular dimension of vertical dimension: horizontal dimension = 3: 4” and “vertical dimension”. “Rectangle: lateral dimension = 9: 16” can be preferably used. In addition, as the planar shape of each first small lens of the first lens array in the tailing relaxation mode lens integrator, for example, “vertical dimension: horizontal dimension = 3: 8 rectangular shape”, “vertical dimension: horizontal dimension” = 9: 32 rectangle "," vertical dimension: lateral dimension = 1: 4 rectangle ", and the like can be preferably used.

  In the projector according to the aspect of the invention, the scanning unit may stop at a position where the illumination light beam illuminates the entire image forming region of the electro-optic modulation device when the normal mode is selected by the mode selection device. preferable.

  With this configuration, when the normal mode is selected by the mode selection device, the light use efficiency can be increased and the stray light level can be decreased.

  In the projector according to the aspect of the invention, the light source device includes an arc tube, an ellipsoidal reflector that reflects light from the arc tube, and an auxiliary mirror that reflects light emitted from the arc tube toward the illuminated region to the arc tube. And a light source device having a collimating lens that makes light reflected by the ellipsoidal reflector substantially parallel light.

  By configuring in this way, the angle range of the illumination light beam incident on each first small lens of the first lens array can be reduced, so that each partial light beam emitted from each first small lens is The light is efficiently inserted into each second small lens of the corresponding second lens array, and the light use efficiency is improved. In this case, since the second small lens becomes small when the tailing relaxation mode is selected by the mode selection device, this effect is particularly great.

In addition, since the light emitted from the arc tube toward the illuminated area is reflected toward the ellipsoidal reflector by the auxiliary mirror, the elliptical surface is large enough to cover the illuminated area side end of the arc tube. It is not necessary to set the size of the reflector, and the ellipsoidal reflector can be miniaturized. As a result, the illumination device can be miniaturized.
Furthermore, since the auxiliary mirror is provided, the focusing angle of the beam focused from the ellipsoidal reflector toward the second focal point of the ellipsoidal reflector and the diameter of the beam spot can be reduced. There is also an effect that the lighting device can be made smaller and the lighting device can be further reduced in size.

  In the projector according to the aspect of the invention, the scanning unit may be disposed between the illumination device and the electro-optic modulation device at a position optically conjugate with the electro-optic modulation device and rotated perpendicular to the illumination optical axis. A rotating prism having an axis, and the rotating prism sequentially scrolls the light irradiation region and the light non-irradiation region on the electro-optic modulation device in synchronization with the screen writing frequency of the electro-optic modulation device. It is preferable that it is comprised so that.

  With this configuration, when the tail relaxation mode is selected by the mode selection device, a smooth scroll operation of the light irradiation region and the light non-irradiation region is realized in the image forming region of the electro-optic modulation device.

In the projector according to the aspect of the invention, when the tail relaxation mode is selected by the mode selection device, the optical selection device is optically conjugate with the electro-optic modulation device between the illumination device and the scanning unit. It is preferable to further include a light shielding device to be inserted.
Further, in this case, the scanning unit includes a rotating prism having a rotation axis perpendicular to the illumination optical axis, and the rotating prism rotates on the electro-optic modulation device with a light irradiation region and a light non-irradiation region. Is preferably sequentially scrolled in synchronization with the screen writing frequency of the electro-optic modulator.

  Also with this configuration, when the tailing relaxation mode is selected by the mode selection device, a smooth scrolling operation of the light irradiation region and the light non-irradiation region is realized in the image forming region of the electro-optic modulation device. In this case, the following effects can also be obtained.

That is, when an arc tube having a relatively long arc length (1.3 mm or more) is used, the illumination light beam emitted from the illumination device is in the other direction at a position optically conjugate with the electro-optic modulation device. It does not become an ideal illumination light beam having a compressed planar shape, but actually becomes an illumination light beam that irradiates light slightly around the plane related to the planar shape.
For this reason, when such an illumination light beam is used, even if the projector is operated in the tailing alleviation mode, the tailing alleviation effect is reduced and a sharp image cannot be obtained.
On the other hand, since the light leaking around the plane can be shielded by configuring as described above, an arc tube having a relatively long arc length (1.3 mm or more) is provided. Even if it is used, the tailing mitigation effect is not reduced.

  In the projector according to the aspect of the invention, a color separation light guide optical system for separating an illumination light beam emitted from the illumination device into a plurality of color lights between the illumination device and the electro-optic modulation device, and the electro-optics As a modulation device, a plurality of color light beams emitted from the color separation light guide optical system are modulated by a plurality of electro-optic modulation devices that modulate image light corresponding to each color light, and the plurality of electro-optic modulation devices. It is preferable to further include a cross dichroic prism that combines the respective color lights.

  By configuring in this way, a projector in which the light use efficiency is not significantly reduced even when smooth and high-quality moving image display can be obtained is a full-color projector having excellent image quality (for example, a three-plate type). Will be able to.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a polarization conversion element that emits the illumination light flux from the light source device so as to be aligned with one type of linearly polarized light.

  With this configuration, the illumination light beam from the light source device can be converted into one type of linearly polarized light having one polarization axis by the action of the polarization conversion element, so that the electro-optic modulation used in the projector When an electro-optic modulation device that uses a single type of linearly polarized light, such as a liquid crystal device, is used as the device, the illumination light beam from the light source device can be used effectively.

  The projector of the present invention will be described below based on the embodiments shown in the drawings.

Embodiment 1
FIG. 1 is a diagram for explaining a projector 1000 according to the first embodiment. 1A is a view of the optical system in the normal mode of the projector 1000 as viewed from above, and FIG. 1B is a view of the optical system in the tailing relaxation mode of the projector 1000 as viewed from above. FIG. 1C is a diagram of the optical system in the normal mode of the projector 1000 viewed from the side, and FIG. 1D is a diagram of the optical system in the tailing relaxation mode of the projector 1000 viewed from the side. In FIG. 1B, the optical system after the rotating prism 770 is the same as that in 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 FIG. 1A, a projector 1000 according to the first embodiment includes an illumination device 100 and a color separation light guide optical system that separates an illumination light beam from the illumination device 100 into three color lights of red, green, and blue. 200, three liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices that modulate each of the three color lights separated by the color separation light guide optical system 200 according to image information, and these three liquid crystal devices 400R , 400G, 400B, a cross dichroic prism 500 that synthesizes the color light modulated by 400B, a projection optical system 600 that projects the light synthesized by the cross dichroic prism 500 onto a projection surface such as a screen SCR, and the projector in normal mode and tailing A mode selection device (not shown) for selecting which mode to operate in the relaxation mode; It is a projector with.

  As shown in FIG. 1, the illumination device 100 includes a light source device 110 that emits an illumination light beam that is substantially parallel to the illuminated region side, and a plurality of light sources that are used to divide the illumination light beam emitted from the light source device 110 into a plurality of partial light beams. And a plurality of second small lenses corresponding to the plurality of first small lenses 132a and 132b of the first lens arrays 130a and 130b. A lens integrator 120 having second lens arrays 140a and 140b having 142a and 142b (not shown), and an illumination light beam emitted from the light source device 110 and having a non-uniform polarization direction are aligned and emitted as one type of linearly polarized light. The polarization conversion element 150 and a superimposing lens for superimposing the partial light beams emitted from the polarization conversion element 150 in the illuminated area And a 60.

  As shown in FIG. 1, 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 focused light reflected by the ellipsoidal reflector 114. And a collimating lens 118 that converts the light into simple light. The arc tube 112 is provided with an auxiliary mirror 116 as a reflecting means for reflecting the light emitted from the arc tube 112 toward the illuminated region again toward the arc tube 112. The light reflected by the auxiliary mirror 116 passes through the arc tube 112 and is reflected by the ellipsoidal reflector 114.

  As the color separation light guide optical system 200, as shown in FIG. 1A, an equal optical path length optical system having the same optical path length from the illumination device 100 to the liquid crystal devices 400R, 400G, and 400B is used. The color separation light guide optical system 200 separates the illumination light beam emitted from the illumination device 100 into a plurality of color lights, and guides each color light to the liquid crystal devices 400R, 400G, and 400B.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the incident illumination light beam according to image information to form a color image, and are the illumination target of the illumination device 100. Although not shown, an incident-side polarizing plate is interposed between the color separation light guide optical system 200 and each of the liquid crystal devices 400R, 400G, and 400B, and each of the liquid crystal devices 400R, 400G, and 400B and the dichroic. An exit-side polarizing plate is interposed between each prism 500. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.
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 a given image signal using a polysilicon TFT as a switching element. The polarization direction of one type of linearly polarized light emitted from the plate is modulated.
As the liquid crystal devices 400R, 400G, and 400B, a wide vision liquid crystal device having a planar shape of “longitudinal dimension along the y-axis direction: lateral dimension along the x-axis direction = 9: 16 rectangle” is used. .

The cross dichroic prism 500 is an optical element that forms a color image by synthesizing optical images modulated for the respective color lights 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 in a substantially X shape at the interface where the right angle prisms are bonded together. One of the approximately X-shaped dielectric multilayer films reflects red light, and the other dielectric multilayer film 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 enlarged and projected by the projection optical system 600 to form a large screen image on the screen SCR.

  The projector 1000 according to the first embodiment includes a mode selection device that selects whether the projector is operated in a normal mode or a tailing relaxation mode, a normal mode lens integrator 120a, and a tailing relaxation mode lens. It is characterized by having a lens integrator 120 having an integrator 120b and provided with a predetermined scanning means. Details will be described below.

  The projector 1000 according to the first embodiment includes a mode selection device (not shown) that selects whether the projector is operated in the normal mode or the tailing relaxation mode.

  For this reason, according to the projector 1000 according to the first embodiment, the normal mode is selected when the screen has a small amount of motion or a bright screen is required, and the screen has a lot of motion or the screen is sharp. Can select the tailing mitigation mode, and can display in the optimum mode according to the content to be displayed.

  The mode selection device may select whether to operate the projector in the normal mode or the tailing mitigation mode according to a user's operation, and detects the content of the content to be displayed. Based on the detected content, the projector may be automatically selected to operate in the normal mode or the tailing relaxation mode.

  The projector 1000 according to the first embodiment includes a lens integrator 120 having a normal mode lens integrator 120a and a trailing relaxation mode lens integrator 120b.

In the normal mode lens integrator 120a, each first small lens 132a in the first lens array 130a transmits the illumination light beam emitted from the illumination device 100 in the vertical and horizontal directions in the image forming regions of the liquid crystal devices 400R, 400G, and 400B. In any direction, it has a planar shape similar to the image forming area of the liquid crystal device so that the illumination light beam has a cross-sectional shape that illuminates the entire image forming area.
On the other hand, in the tail relaxation mode lens integrator 120b, each first small lens 132b in the first lens array 130b transmits the illumination light beam emitted from the illumination device 100 in the image forming area of the liquid crystal devices 400R, 400G, and 400B. An illumination light beam having a cross-sectional shape that illuminates the entire image forming area in one of the vertical and horizontal directions (x-axis direction) and a part of the image forming area in the other direction (y-axis direction). The planar shape is compressed in the other direction (y-axis direction).

  The projector 1000 according to the first embodiment is characterized by including a rotating prism 770 as scanning means.

  This rotating prism 770 is synchronized with the screen writing frequency of the liquid crystal devices 400R, 400G, and 400B when the tailing relaxation mode is selected, in the other direction (y-axis direction) on the image forming area of the liquid crystal devices 400R, 400G, and 400B. ) Along the illumination light beam. The rotating prism 770 is disposed between the illumination device 100 and the liquid crystal devices 400R, 400G, and 400B. The rotating prism 770 has a rotation axis 772 perpendicular to the illumination optical axis 100ax. The rotation shaft 772 is disposed at a position optically conjugate with the image forming areas of the liquid crystal devices 400R, 400G, and 400B.

  Therefore, according to the projector 1000 according to the first embodiment, when the tail relaxation mode is selected by the mode selection device, the tail relaxation mode lens integrator 120b is inserted into the optical path of the illumination light beam, and the scanning unit serves as a scanning unit. Rotating prism 770 of this type comes to perform a predetermined operation. As a result, the entire image forming area is illuminated in one direction (x-axis direction) in the image forming area of the liquid crystal devices 400R, 400G, and 400B, and a part of the image forming area is illuminated in the other direction (y-axis direction). An illumination light beam having such a cross-sectional shape (ie, a cross-sectional shape compressed in the other direction (y-axis direction)) is synchronized with the screen writing frequency of the liquid crystal devices 400R, 400G, and 400B on the image forming area of the liquid crystal device. Since scanning can be performed along the other direction (y-axis direction), the light irradiation region and the light non-irradiation region are sequentially scrolled alternately in the image forming region of the liquid crystal devices 400R, 400G, and 400B. become. As a result, the tailing phenomenon is alleviated and a smooth and high-quality moving image display can be obtained.

  Further, according to the projector 1000 according to the first embodiment, the illumination light beam having the cross-sectional shape compressed in the other direction (y-axis direction) as described above is used as the lens integrator, and the planar shape of the first small lens 132b is changed to the other direction. Unlike the case of using an optical shutter, the illumination emitted from the light source device 110 is realized by using the tail relaxation mode lens integrator 120b having the first lens array 130b compressed in the y-axis direction. The luminous flux can be led to the image forming areas of the liquid crystal devices 400R, 400G, and 400B without waste, and the light use efficiency is not significantly reduced.

  For this reason, the projector 1000 according to the first embodiment is a projector in which the light use efficiency is not significantly reduced even when smooth and high-quality moving image display is obtained.

  FIG. 2 is a diagram for explaining the normal mode lens integrator 120a and the trailing relaxation mode lens integrator 120b. FIG. 2A is a diagram illustrating the first lens array 130a in the normal mode lens integrator 120a, and FIG. 2B is a diagram illustrating the first lens array 130b in the tail relaxation mode lens integrator 120b.

  The length along one direction (x-axis direction) of the first small lens 132b in the tailing relaxation mode lens integrator 120b is in one direction (x-axis direction) of the first small lens 132a in the normal mode lens integrator 120a. It is the same as the length along. On the other hand, the length along the other direction (y-axis direction) of the first small lens 132b in the tailing relaxation mode lens integrator 120b is the other direction (y-axis direction) of the first small lens 132a in the normal mode lens integrator 120a. ) Is set to 50% of the length along.

  In addition, the number of arrays (four rows) along one direction (x-axis direction) of the first small lens 132b in the tail relaxation mode lens integrator 120b is one direction in the first small lens 132a in the normal mode lens integrator 120a. It is the same as the number of arrays (4 columns) along (x-axis direction). On the other hand, the arrangement number (14 rows) along the other direction (y-axis direction) of the first small lens 132b in the tail relaxation mode lens integrator 120b is the other direction of the first small lens 132a in the normal mode lens integrator 120a. It is set to twice the number of arrays (7 rows) along (y-axis direction).

  Therefore, the outer diameter of the first lens array 130b in the tailing relaxation mode lens integrator 120b is the same as the outer diameter of the first lens array 130a in the normal mode lens integrator 120a.

  Further, the focal length of the first small lens 132b in the tail relaxation mode lens integrator 120b is the same as the focal length of the first small lens 132a in the normal mode lens integrator 120a.

  Therefore, according to the projector 1000 according to the first embodiment, when switching between the normal mode and the trailing alleviation mode, the normal mode lens integrator 120a and the trailing alleviation mode lens integrator 120b may be simply replaced. The mechanism for replacing the normal mode lens integrator 120a and the trailing relaxation mode lens integrator 120b can be made very simple.

  In the projector 1000 according to the first embodiment, the first lens array 130a in the normal mode lens integrator 120a and the first lens array 130b in the tailing relaxation mode lens integrator 120b include the first small lenses 132a and 132b. Since the four lenses are arranged in the direction (x-axis direction), the lens density of the first small lenses 132a and 132b in the first lens arrays 130a and 130b is lower than that in the case of the conventional projector, and the first small lenses The sizes of 132a and 132b can be made sufficiently large. For this reason, the length of the side along the other direction (y-axis direction) of each of the first small lenses 132a and 132b in the first lens arrays 130a and 130b is not extremely shortened. As a result, the images of the first small lenses 132a and 132b of the first lens arrays 130a and 130b are favorably displayed on the second small lenses 142a and 142b (not shown) of the corresponding second lens arrays 140a and 140b. It becomes swallowed and good light utilization efficiency is obtained.

  In the projector 1000 according to the first embodiment, the first lens array 130a in the normal mode lens integrator 120a and the first lens array 130b in the tail relaxation mode lens integrator 120b are each inserted in the optical path of the illumination light beam. The light incident surface is closer to the ellipsoidal reflector 114 than the second focal point of the ellipsoidal reflector 114, and the illumination light beam emitted from the light source device 110 is arranged on the light incident surface so as to be distributed over the entire surface. Has been.

  For this reason, the light quantity of the illumination light beam emitted from the light source device 110 is distributed over the whole on the light incident surfaces of the first lens arrays 130a and 130b. Therefore, even if the first lens arrays 130a and 130b having a relatively low lens density are obtained by arranging the first small lenses 132a and 132b in four rows in one direction, the first lenslets 132a and 132b are arranged on the image forming area of the liquid crystal devices 400R, 400G, and 400B. Therefore, the in-plane light intensity distribution characteristics in the first lens arrays 130a and 130b can be simplified and the cost can be reduced.

  In addition, when the first lens array 130a in the normal mode lens integrator 120a and the first lens array 130b in the tail relaxation mode lens integrator 120b are respectively inserted in the optical path of the illumination light beam, the first lens arrays 130a and 130b are used. The first lens arrays 130a and 130b are arranged at a position where there is no region where the incident light intensity is extremely small (so-called shadow region of the arc tube 112) in the center of the light incident surface. For this reason, the light quantity of the illumination light beam emitted from the light source device 110 on the light incident surfaces of the first lens arrays 130a and 130b is distributed over the entire surface.

  In the projector 1000 according to the first embodiment, “planar dimension: lateral dimension = 9: 16 rectangle” is used as the planar shape of each first small lens 132a of the first lens array 130a in the normal mode lens integrator 120a. The planar shape of each first small lens 132b of the first lens array 130b in the tailing relaxation mode lens integrator 120b is “rectangular dimension with vertical dimension: horizontal dimension = 9: 32”.

  FIG. 3 is a diagram for explaining what in-plane light intensity distribution the illumination light beam has when the normal mode is selected. FIG. 3A is a diagram showing an in-plane light intensity distribution on the first lens array 130a, and FIG. 3B is a diagram showing an in-plane light intensity distribution on the second lens array 140a. FIG. 3C is a diagram showing in-plane light intensity distribution in a plane optically conjugate with the image forming region of the liquid crystal device, and FIGS. 3D and 3E are in-plane light intensity distributions. FIG.

FIG. 4 is a diagram for explaining what in-plane light intensity distribution the illumination light beam has when the tailing relaxation mode is selected. 4A is a diagram showing an in-plane light intensity distribution on the first lens array 130b, and FIG. 4B is a diagram showing an in-plane light intensity distribution on the second lens array 140b. FIG. 4C is a diagram showing the in-plane light intensity distribution in a plane optically conjugate with the image forming region of the liquid crystal device, and FIGS. 4D and 4E are the in-plane light intensity distributions. FIG.
3 and 4, L represents an illumination light beam, Ls represents stray light, and S ₁ represents an area corresponding to an image forming area at a conjugate position of the liquid crystal device.

As described above, in the projector 1000 according to the first embodiment, when the normal mode is selected, as shown in FIG. 3C, the illumination light beam is emitted from the normal projector by the action of the normal mode lens integrator 120a. Similarly to the case, a planar shape similar to the image forming area is illuminated so that the entire image forming area is illuminated in any of the vertical and horizontal directions (x-axis direction and y-axis direction) in the image forming area of the liquid crystal device. It becomes an illumination light beam having.
On the other hand, when the tailing relaxation mode is selected, as shown in FIG. 4C, the illumination light flux is one of the vertical and horizontal directions in the image forming region of the liquid crystal device by the action of the tailing relaxation mode lens integrator 120b. A planar shape compressed in the other direction (y-axis direction) that illuminates the entire image forming area in the direction (x-axis direction) and a part of the image forming area in the other direction (y-axis direction). The illumination light flux has

  FIG. 5 is a diagram showing the relationship between the rotation of the rotating prism 770 and the illumination state on the image forming areas of the liquid crystal devices 400R, 400G, and 400B. FIG. 5A is a cross-sectional view of the rotating prism 770 when viewed along the rotation axis 772. FIG. 5B is a diagram when the rotating prism 770 is viewed along the illumination optical axis. FIG. 5C is a diagram showing an irradiation state of the illumination light beam on the image forming areas of the liquid crystal devices 400R, 400G, and 400B.

  As shown in FIGS. 5A and 5B, the rotation axis of the rotation prism 770 rotates as the rotation prism 770 rotates the image P of the virtual center point of the first lens array 130b on the illumination optical axis 100ax. A state in which the image is scrolled up and down around 772 is shown. As a result, as shown in FIG. 5C, when the rotating prism 770 rotates, the light irradiation area and the light non-irradiation area are scrolled alternately in the image forming area of the liquid crystal devices 400R, 400G, and 400B. become.

  When the normal mode is selected by the mode selection device, the rotating prism 770 stops at a position where the illumination light beam illuminates the entire image forming area of the liquid crystal devices 400R, 400G, and 400B. At this time, the rotating prism 770 stops at a position where the light incident surface is perpendicular to the illumination optical axis 100ax. Therefore, according to the projector 1000 according to the first embodiment, when the normal mode is selected by the mode selection device, the rotating prism is positioned so that the illumination light beam illuminates the entire image forming area of the liquid crystal devices 400R, 400G, and 400B. Since 770 is stationary, the light utilization efficiency increases and the stray light level decreases.

  In the projector 1000 according to the first embodiment, the antireflection film is formed on the light transmission surface of the rotating prism 770. For this reason, since the light transmittance in the rotating prism 770 is improved, a decrease in light utilization efficiency can be minimized, and the stray light level is reduced and the contrast is improved.

  In the projector 1000 according to the first embodiment, the light source device 110 includes an auxiliary mirror 116 that reflects the light emitted from the arc tube 112 toward the illuminated region to the arc tube 112.

  For this reason, since the angle range of the illumination light beam incident on the first small lenses 132a and 132b of the first lens arrays 130a and 130b can be reduced, each of the light emitted from the first small lenses 132a and 132b. The partial luminous flux is only satisfactorily inserted into the second small lenses 142a and 142b of the corresponding second lens arrays 140a and 140b, and the light use efficiency is improved. In this case, since the first small lens 132b and the second small lens 142b are small when the tailing relaxation mode is selected by the mode selection device, this effect is particularly great.

Further, since the light emitted from the arc tube 112 toward the illuminated area is reflected by the auxiliary mirror 116 toward the ellipsoidal reflector 114, the size of the arc tube 112 is large enough to cover the illuminated area side end. In addition, it is not necessary to set the size of the ellipsoidal reflector 114, and the ellipsoidal reflector 114 can be downsized. As a result, the lighting device 100 can be miniaturized.
Furthermore, since the auxiliary mirror 116 is provided, the focusing angle of the beam focused from the ellipsoidal reflector 114 toward the second focal point of the ellipsoidal reflector 114 and the diameter of the beam spot can be reduced. There is an effect that the elements can be further reduced, and the lighting device 100 can be further reduced in size.

In the projector 1000 according to the first embodiment, as shown in FIG. 1A, an illumination light beam emitted from the illumination device 100 is converted into a plurality of color lights between the illumination device 100 and the liquid crystal devices 400R, 400G, and 400B. A color separation light guide optical system 200 for separation and a liquid crystal device 400R, 400G that modulates a plurality of color lights emitted from the color separation light guide optical system 200 according to image information corresponding to each color light as a liquid crystal device. , 400B and a cross dichroic prism 500 for combining the respective color lights modulated by the liquid crystal devices 400R, 400G, 400B.
For this reason, even if smooth and high-quality moving image display is obtained, a projector in which the light use efficiency is not significantly reduced can be a three-plate full-color projector with excellent image quality.

The projector 1000 according to the first embodiment further includes a polarization conversion element 150 that emits the illumination light beam from the light source device 110 so as to be aligned with one type of linearly polarized light.
The polarization conversion element 150 transmits one linear polarization component of the polarization component included in the illumination light beam from the light source device 110 as it is, and reflects the other linear polarization component in a direction perpendicular to the illumination optical axis 100ax. And the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax, and the other linearly polarized light component reflected by the reflective layer is converted into one linearly polarized light component. And a retardation plate.
For this reason, since the illumination light beam from the light source device 110 can be converted into one type of linearly polarized light having one polarization axis by the action of the polarization conversion element 150, as in the projector 1000 according to the first embodiment. When an electro-optic modulation device that uses one type of linearly polarized light, such as a liquid crystal device, is used as the electro-optic modulation device, the illumination light beam from the light source device 110 can be used effectively.

[Embodiment 2]
FIG. 6 is a diagram for explaining a projector 1002 according to the second embodiment. 6A is a view of the optical system in the normal mode of the projector 1002 as viewed from above, and FIG. 6B is a view of the optical system in the tailing relaxation mode of the projector 1002 as viewed from above. FIG. 6C is a diagram of the optical system in the normal mode of the projector 1002 viewed from the side, and FIG. 6D is a diagram of the optical system in the tailing relaxation mode of the projector 1002 viewed from the side. In FIG. 6B, the optical system after the rotating prism 770 is the same as that in FIG.

FIG. 7 is a diagram for explaining the in-plane light intensity distribution of the illumination light beam when the tailing relaxation mode is selected in the projector 1002 according to the second embodiment. FIG. 7A is a diagram showing the in-plane light intensity distribution in a plane optically conjugate with the image forming regions of the liquid crystal devices 400R, 400G, and 400B. FIGS. 7B and 7C show the in-plane light intensity distribution. It is a figure which graphs and shows in-plane light intensity distribution.
FIG. 8 is a diagram illustrating the in-plane light intensity distribution of the illumination light beam when the tailing relaxation mode is selected in the projector according to the comparative example of the second embodiment. FIG. 8A is a diagram showing the in-plane light intensity distribution on the image forming area of the liquid crystal device, and FIGS. 8B and 8C are graphs showing the in-plane light intensity distribution. is there.
7 and 8, L represents an illumination light beam, Ls represents stray light, and S ₁ represents an area corresponding to an image forming area at a conjugate position of the liquid crystal device.

  As shown in FIGS. 6B and 6D, the projector 1002 according to the second embodiment is arranged between the illumination device 100 and the rotating prism 770 when the tail relaxation mode is selected by the mode selection device. In addition, the light-emitting device 170 is further provided with a light-shielding device 170 inserted at a position substantially optically conjugate with the liquid crystal devices 400R, 400G, and 400B.

  As described above, when an arc tube having a relatively long arc length (1.3 mm or more) is used as the arc tube 112 in the light source device 110, the illumination light beam emitted from the illumination device 100 is emitted from the liquid crystal devices 400R and 400G. , 400B at an optically conjugate position, as shown in FIG. 8A, an ideal illumination light beam having a planar shape compressed in the other direction (y-axis direction) is not obtained. The illumination light flux is such that light is further irradiated around the plane related to the shape. For this reason, when such an illumination light beam is used, even if the projector is operated in the tailing alleviation mode, the tailing alleviation effect is reduced and a sharp image cannot be obtained.

  On the other hand, according to the projector 1002 according to the second embodiment, the liquid crystal device between the illumination device 100 and the liquid crystal devices 400R, 400G, and 400B is optically optical when the tailing relaxation mode is selected by the mode selection device. Since the light shielding device 170 is inserted at a substantially conjugate position, the light leaking to the surroundings as described above can be shielded. Therefore, in the image forming areas of the liquid crystal devices 400R, 400G, and 400B, as shown in FIG. 7A, the illumination light beam has an ideal illumination having a planar shape compressed in the other direction (y-axis direction). It has an in-plane light intensity distribution close to the luminous flux. For this reason, according to the projector 1002 according to the second embodiment, even when the arc tube having a relatively long arc length (1.3 mm or more) is used, the trailing relaxation effect is not reduced.

  The projector 1002 according to the second embodiment has the same configuration as that of the projector 1000 according to the first embodiment except for the above, and thus has the same effect as the projector 1000 according to the first embodiment.

[Embodiment 3]
FIG. 9 is a diagram for explaining a projector 1004 according to the third embodiment. 9A is a view of the optical system in the normal mode of the projector 1004 as viewed from above, and FIG. 9B is a view of the optical system in the tailing relaxation mode of the projector 1004 as viewed from above. FIG. 9C is a diagram of the optical system in the normal mode of the projector 1004 viewed from the side, and FIG. 9D is a diagram of the optical system in the tailing relaxation mode of the projector 1004 viewed from the side.

  The projector 1004 according to the third embodiment is different from the projectors 1000 and 1002 according to the first or second embodiment in the configuration of the color separation / light guiding optical system 202. That is, in the projector 1004 according to the third embodiment, the direction in which the light irradiation region and the light non-irradiation region are scrolled on each of the liquid crystal devices 400R, 400G, and 400B as the color separation light guide optical system is the same direction. For this purpose, a color separation light guide optical system 202 having a double relay optical system 190 is used instead of the equal optical path length optical system.

  As described above, the projector 1004 according to the third embodiment is different from the projectors 1000 and 1002 according to the first or second embodiment in the configuration of the color separation light guide optical system 202, but according to the first or second embodiment. Similarly to the projectors 1000 and 1002, when the tail relaxation mode is selected by the mode selection device, the tail relaxation mode lens integrator 120b is inserted into the optical path of the illumination light beam, and the rotating prism 770 operates in a predetermined manner. Come to do. For this reason, according to the projector 1004 according to the third embodiment, the entire image forming area in one direction (x-axis direction) in the vertical and horizontal directions in the image forming areas of the liquid crystal devices 400R, 400G, and 400B is displayed in the other direction (y In the liquid crystal devices 400R, 400G, and 400B, an illumination light beam having a cross-sectional shape that illuminates a part of the image forming region (ie, a cross-sectional shape compressed in the other direction (y-axis direction)) Since the image forming area of the liquid crystal device can be scanned along the other direction (y-axis direction) in synchronization with the writing frequency, light irradiation is performed in the image forming areas of the liquid crystal devices 400R, 400G, and 400B. The region and the light non-irradiation region are scrolled alternately one after another. As a result, the tailing phenomenon is alleviated and a smooth and high-quality moving image display can be obtained.

  Further, according to the projector 1004 according to the third embodiment, the illumination light beam having a cross-sectional shape compressed in the other direction (y-axis direction) as described above is used as the lens integrator, and the planar shape of the first small lens 132b is changed to the other direction. Unlike the case where an optical shutter is used, the illumination light beam emitted from the light source device 110 can be used in a liquid crystal manner without waste, because the tail relaxation mode lens integrator 120b having the first lens array 130b compressed in the first is used. It becomes possible to guide to the image forming areas of the devices 400R, 400G, and 400B, and the light utilization efficiency is not greatly reduced.

  Therefore, similarly to the projectors 1000 and 1002 according to the first or second embodiment, the projector 1004 according to the third embodiment has a light use efficiency even when smooth and high-quality moving image display is obtained. The projector will not drop significantly.

  Note that, in the projector 1004 according to the third embodiment, as in the case of the projector 1002 according to the second embodiment, when the tail relaxation mode is selected by the mode selection device, the illumination device 100 and the rotating prism 770 are between. There may be further provided a light shielding device inserted at a position optically conjugate with the liquid crystal devices 400R, 400G, and 400B. In that case, as in the case of the projector 1002 according to the second embodiment, the effect of reducing the tailing is reduced even when the arc tube having a relatively long arc length (1.3 mm or more) is used. Nothing will happen.

  The projector of the present invention has been described based on each of the above embodiments. However, the present invention is not limited to each of the above embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

(1) The projectors 1000 to 1004 of the above embodiments are transmissive projectors using a transmissive electro-optic modulation device, but the present invention is not limited to this. The present invention can also be applied to a reflection type projector using a reflection type electro-optic modulation device.

(2) Although the projectors 1000 to 1004 of the above embodiments use a liquid crystal device as an electro-optic modulation device, the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(3) The projectors 1000 to 1004 of the above embodiments use the rotating prism 770 as scanning means, but the present invention is not limited to this. As the scanning means, for example, a galvanometer mirror, a polygon mirror, DMD (digital micromirror device) (trademark of TI), etc. can be preferably used.

(4) The projectors 1000 to 1004 according to the above embodiments include, as the light source device 110, an ellipsoidal reflector 114, an arc tube 112 having a light emission center near the first focal point of the ellipsoidal reflector 114, and a collimating lens 118. Although the light source device is used, the present invention is not limited to this. As the light source device, a light source device having a parabolic reflector and an arc tube having a light emission center in the vicinity of the focal point of the parabolic reflector can also be preferably used.

(5) In each of the above embodiments, the projector using the three liquid crystal devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this, and one, two, or four or more liquid crystals are used. The present invention can also be applied to a projector using the device.

(6) The present invention can be applied to a front projection projector that projects from the side that observes the projected image, and also to a rear projection projector that projects from the side opposite to the side that observes the projected image.

FIG. 3 is a diagram for explaining a projector 1000 according to the first embodiment. The figure shown in order to demonstrate the lens integrator 120a for normal modes, and the lens integrator 120b for trailing relaxation modes. The figure shown in order to demonstrate what kind of in-plane light intensity distribution an illumination light beam has when normal mode is selected. The figure shown in order to demonstrate what kind of in-plane light intensity distribution an illumination light beam has when the tailing relaxation mode is selected. The figure which shows the relationship between rotation of a rotation prism, and the illumination state on the image formation area of a liquid crystal device. FIG. 6 is a diagram for explaining a projector 1002 according to a second embodiment. The figure shown in order to demonstrate what kind of in-plane light intensity distribution an illumination light beam has when the tailing relaxation mode is selected. The figure shown in order to demonstrate what kind of in-plane light intensity distribution an illumination light beam has when normal mode use is selected. FIG. 6 is a diagram for explaining a projector according to a third embodiment. The figure shown in order to demonstrate the conventional projector. The figure shown in order to demonstrate another conventional projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Illuminating device, 100ax ... Illumination optical axis, 110 ... Light source device, 112 ... Arc tube, 114 ... Ellipsoidal reflector, 116 ... Auxiliary mirror, 118 ... Parallelizing lens, 120 ... Lens integrator, 120a ... Lens integrator for normal mode , 120b ... Trailing relaxation mode lens integrator, 130a, 130b ... first lens array, 132a, 132b ... first small lens, 140a, 140b ... second lens array, 150 ... polarization conversion element, 160 ... superimposing lens, 170 DESCRIPTION OF SYMBOLS ... Shading device, 190 ... Double relay type optical system, 200, 202 ... Color separation optical system, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection optical system, 770 ... Rotating prism, 772 ... Rotation Axis, 900A, 900B, 1000, 10 2,1004 ... projector, L ... illumination beams, Ls ... stray, P ... image of the virtual center point of first lens array on the illumination optical axis, the area corresponding to the image formation region in the conjugate position of S ₁ ... liquid crystal device, SCR ... screen.

Claims (12)

A light source device that emits a substantially parallel illumination light beam toward the illuminated region, a first lens array having a plurality of first small lenses for dividing the illumination light beam emitted from the light source device into a plurality of partial light beams, and A lens integrator having a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array, and respective partial light beams emitted from the lens integrator are superimposed on the illuminated region. An illumination device having a superimposing lens for
An electro-optic modulation device that modulates an illumination light beam emitted from the illumination device according to image information;
A projection optical system that projects an illumination light beam modulated by the electro-optic modulation device,
The normal mode for illuminating the entire image forming area in any of the vertical and horizontal directions in the image forming area of the electro-optic modulator, and the vertical and horizontal directions in the image forming area of the electro-optic modulator. Is a mode selection device that selects which mode to operate in the tail relaxation mode in which the entire image forming area is illuminated in the other direction and a part of the image forming area is illuminated;
When the tail relaxation mode is selected by the mode selection device, the illumination light beam is scanned along the other direction on the image forming area of the electro-optic modulation device in synchronization with the screen writing frequency of the electro-optic modulation device. Scanning means,
In the illumination device, as the lens integrator, a normal mode lens integrator that is inserted into an optical path of an illumination light beam when the normal mode is selected by the mode selection device, and a tailing relaxation mode is selected by the mode selection device. And a tail relaxation mode lens integrator that is inserted into the light path of the illumination light beam when
In the normal mode lens integrator, each of the first small lenses in the first lens array emits the illumination light beam emitted from the illumination device in any of the vertical and horizontal directions in the image forming area of the electro-optic modulation device. Also has a planar shape similar to the image forming region of the electro-optic modulation device, so that the illumination light beam has a cross-sectional shape that illuminates the entire image forming region,
In the tail relaxation mode lens integrator, each first small lens in the first lens array transmits an illumination light beam emitted from the illumination device in the one direction in the image forming region of the electro-optic modulation device. The entire image forming area has a planar shape compressed in the other direction so as to be an illumination light beam having a cross-sectional shape that illuminates a part of the image forming area in the other direction. Projector. The projector according to claim 1, wherein
The length along the one direction of the first small lens in the tail relaxation mode lens integrator is the same as the length along the one direction of the first small lens in the normal mode lens integrator,
The length along the other direction of the first small lens in the tail relaxation mode lens integrator is shorter than the length along the other direction of the first small lens in the normal mode lens integrator. Characteristic projector. The projector according to claim 2,
The number of arrays along the one direction of the first small lens in the tail relaxation mode lens integrator is the same as the number of arrays along the one direction of the first small lens in the normal mode lens integrator. ,
The number of arrays along the other direction of the first small lens in the tail relaxation mode lens integrator is greater than the number of arrays along the other direction of the first small lens in the normal mode lens integrator. Projector. The projector according to claim 3, wherein
The projector according to claim 1, wherein an outer diameter of the first lens array in the tail relaxation mode lens integrator is the same as an outer diameter of the first lens array in the normal mode lens integrator. The projector according to any one of claims 1 to 4,
The projector according to claim 1, wherein a focal length of the first small lens in the tail relaxation mode lens integrator is the same as a focal length of the first small lens in the normal mode lens integrator. In the projector according to any one of claims 1 to 5,
The projector is characterized in that when the normal mode is selected by the mode selection device, the scanning unit stops at a position where the illumination light beam illuminates the entire image forming area of the electro-optic modulation device. In the projector according to any one of claims 1 to 6,
The light source device includes an arc tube, an ellipsoidal reflector that reflects light from the arc tube, an auxiliary mirror that reflects light emitted from the arc tube toward the illuminated region to the arc tube, and the ellipsoid reflector. A projector comprising: a light source device having a collimating lens that makes the emitted light substantially parallel. In the projector according to any one of claims 1 to 7,
The scanning unit includes a rotating prism disposed between the illumination device and the electro-optic modulation device at a position optically conjugate with the electro-optic modulation device and having a rotation axis perpendicular to the illumination optical axis. ,
The rotating prism is configured such that the light irradiation region and the light non-irradiation region are sequentially scrolled in synchronization with the screen writing frequency of the electro-optic modulation device on the electro-optic modulation device by the rotation. Projector. In the projector according to any one of claims 1 to 7,
A light-shielding device that is inserted between the illumination device and the scanning unit and optically conjugate with the electro-optic modulation device when the tail relaxation mode is selected by the mode selection device; A projector characterized by comprising. The projector according to claim 9, wherein
The scanning means includes a rotating prism having a rotation axis perpendicular to the illumination optical axis,
The rotating prism is configured such that the light irradiation region and the light non-irradiation region are sequentially scrolled in synchronization with the screen writing frequency of the electro-optic modulation device on the electro-optic modulation device by the rotation. Projector. The projector according to any one of claims 1 to 10,
A color separation light guide optical system for separating an illumination light beam emitted from the illumination device into a plurality of color lights between the illumination device and the electro-optic modulation device;
As the electro-optic modulator, a plurality of electro-optic modulators that modulate a plurality of color lights emitted from the color separation light guide optical system according to image information corresponding to each color light, and
A projector further comprising: a cross dichroic prism that combines the respective color lights modulated by the plurality of electro-optic modulators. The projector according to any one of claims 1 to 11,
A projector further comprising a polarization conversion element that emits an illumination light beam from the light source device so as to be aligned with one type of linearly polarized light.