JP2006259713A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which has excellent moving picture display characteristics and uniform in-plane display characteristics, and has the manufacture cost and the power consumption of which are prevented from getting higher. <P>SOLUTION: The projector includes: a liquid crystal device; a projection optical system; an illuminating device 100 that emits illumination light beam having a sectional shape compressed in a y-axis direction so as to illuminate an entire image forming area with respect to an x-axis direction in the image forming area of the liquid crystal devices 400R, 400G and 400B and illuminate one portion of the image forming area with respect to the y-axis direction; and a rotating prism rotated at a constant speed and scanning the illumination light beam from the illuminating device along the y-axis direction in the image forming area of the liquid crystal device. The projector further comprises an illuminating device driving circuit 710 that temporally controls the light amount of the illumination light beam emitted from the illuminating device so as to reduce an illuminance difference generated by changing the scanning speed of the illumination light beam on the image forming area in the liquid crystal device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector.

  A projector is known in which moving image display characteristics are improved by scanning an illumination light beam on an image forming area of a liquid crystal device (see, for example, Patent Document 1).

FIG. 18 is a diagram for explaining such a conventional projector 900. 18A is a diagram showing an optical system of a conventional projector 900, FIG. 18B is a diagram for explaining the operation of the rotating prism 960, and FIG. 18C is a diagram showing the rotating prism 960. It is a figure which shows a mode that an illumination light beam is scanned on the image formation area of the liquid crystal device 970 by rotating.
FIG. 19 is a diagram showing the rotation speed of the rotating prism 960 in the conventional projector 900.

  In the conventional projector 900, as shown in FIG. 18, the illumination light beam L is scanned on the image forming area of the liquid crystal device 970 by rotating the rotating prism 960. For this reason, according to the conventional projector 900, since the light is intermittently blocked by paying attention to an arbitrary point in the image forming area of the liquid crystal device 970, the moving image display characteristics are improved, and the excellent moving image display is achieved. It has characteristics.

  In the conventional projector 900, as shown in FIG. 19, the illumination light beam L is scanned at a constant speed on the image forming area of the liquid crystal device 970 by changing the rotational speed of the rotating prism 960. . Therefore, according to the conventional projector 900, the difference in illuminance in the image forming area of the liquid crystal device 970 is reduced, and a more uniform display can be performed on the entire projection surface. That is, it has uniform in-plane display characteristics.

JP 2004-325577 A

However, in the conventional projector 900, since it is necessary to accurately change the rotation speed of the rotating prism in a very short cycle, it is necessary to use an expensive motor as a motor for driving the rotating prism, and the manufacturing cost is increased. There was a problem that would become high.
Further, in the conventional projector 900, since it is necessary to change the rotation speed of the rotating prism in a very short cycle, it is necessary to frequently accelerate and decelerate the rotation speed of the motor for driving the rotating prism, There was a problem that the power consumption would be high.

  Therefore, the present invention has been made to solve such problems, and has excellent moving image display characteristics and uniform in-plane display characteristics, and increases manufacturing costs and power consumption. An object of the present invention is to provide a projector without any problem.

  The projector of the present invention includes an electro-optic modulation device that modulates an illumination light beam according to image information, a projection optical system that projects the illumination light beam modulated by the electro-optic modulation device, and an image forming area of the electro-optic modulation device. An illumination device that emits an illumination light beam having a cross-sectional shape compressed in the other direction so as to illuminate the entire image formation region in one direction and a part of the image formation region in the other direction; A projector that includes a rotating prism that rotates at a speed and scans the illumination light beam from the illumination device along the other direction in the image forming region of the electro-optic modulation device, the scanning speed of the illumination light beam being The light is emitted from the illumination device so as to reduce the difference in illuminance caused by the change in the image forming area in the electro-optic modulation device. And further comprising a lighting device driving circuit which controls the amount of bright light bundle.

  Therefore, according to the projector of the present invention, the illumination light beam is scanned on the image forming area of the electro-optic modulation device by rotating the rotating prism. As a result, if attention is paid to an arbitrary point in the image forming area of the electro-optic modulation device, light is intermittently blocked, so that the moving image display characteristics are improved and the moving image display characteristics are excellent.

In addition, according to the projector of the present invention, it is possible to control the amount of illumination light flux so as to reduce the illuminance difference. Therefore, the illuminance difference (when the rotating prism is rotated at a constant rotational speed ( The scanning speed of the illumination light beam at both ends in the other direction in the image forming region of the electro-optic modulation device is faster than the scanning speed of the illumination light beam in the center portion in the other direction. The illuminance at is lower than the illuminance at the center in the other direction.) Is reduced, and more uniform display can be performed on the entire projection surface. That is, it has uniform in-plane display characteristics.
In this case, when the illumination light beam passes through the central portion in the other direction in the image forming region of the electro-optic modulation device, the amount of the illumination light beam emitted from the illumination device is small, and the illumination light beam is in the image formation region of the electro-optic modulation device. When passing through both ends in the other direction, control is performed so that the amount of illumination light beam emitted from the illumination device is increased.

  Further, according to the projector of the present invention, it is not necessary to change the rotation speed of the rotating prism in a very short cycle, so that it is not necessary to use an expensive motor as a motor for driving the rotating prism. There is no need to frequently accelerate and decelerate the rotational speed of the motor for driving the motor. For this reason, there is no increase in manufacturing cost or power consumption.

  Therefore, according to the projector of the present invention, the projector has excellent moving image display characteristics and uniform in-plane display characteristics, and does not increase in manufacturing cost or power consumption. Is achieved.

  The projector according to the aspect of the invention further includes a rotation state detection sensor that detects a rotation state of the rotating prism, and the lighting device driving circuit is emitted from the lighting device based on an output signal of the rotation state detection sensor. It is preferable to control the amount of illumination light flux.

  With this configuration, it is possible to perform accurate control corresponding to the rotation state of the rotating prism. This is because the scanning speed of the illumination light flux changes on the image forming area in the electro-optic modulator. It is possible to effectively reduce the illuminance difference that occurs.

  The projector according to the aspect of the invention further includes an image processing circuit that processes image information, and the rotating prism is configured to rotate at a constant speed based on a synchronization signal from the image processing circuit. The apparatus driving circuit preferably controls the amount of illumination light beam emitted from the illumination apparatus based on a synchronization signal from the image processing circuit.

  The rotation of the rotating prism is performed based on a synchronization signal from the image processing circuit. For this reason, since it is possible to perform accurate control corresponding to the rotation state of the rotating prism even with the above-described configuration, the scanning speed of the illumination light beam changes on the image forming area in the electro-optic modulator. It is possible to effectively reduce the difference in illuminance that occurs due to this.

  In the projector according to the aspect of the invention, the illuminating device includes a light-emitting tube and a reflector, and a light source device that emits an illuminating light beam toward the illuminated area. The illumination device divides the illuminating light beam emitted from the light source device into a plurality of partial light beams. A first lens array having a plurality of first small lenses, a second lens array having a plurality of second small lenses corresponding to the plurality of first small lenses in the first lens array, and the second lens array. It is an illuminating device having a superimposing lens for superimposing the partial light beams emitted from the plurality of second small lenses in the illumination region, and the first small lens has a planar shape compressed in the other direction. preferable.

  With this configuration, by using the illumination device including the lens integrator optical system as described above, it is possible to emit an illumination light beam having a cross-sectional shape compressed in the other direction and a uniform in-plane illuminance distribution. It becomes possible, and the light utilization efficiency can be improved. As a result, it is possible to configure a projector that has excellent moving image display characteristics and uniform in-plane display characteristics, and does not increase manufacturing cost or power consumption.

  In the projector according to the aspect of the invention, the illuminating device includes a light-emitting tube and an ellipsoidal reflector, and a light source device that emits a convergent illumination light beam toward the illuminated region, and a more uniform intensity distribution of the illumination light beam from the light source device It is preferable that the light emitting surface of the integrator rod has a planar shape compressed in the other direction.

  With this configuration, by using the illumination device including the rod integrator optical system as described above, it is possible to emit an illumination light beam having a cross-sectional shape compressed in the other direction and a uniform in-plane illuminance distribution. It becomes possible, and the light utilization efficiency can be improved. As a result, it is possible to configure a projector that has excellent moving image display characteristics and uniform in-plane display characteristics, and does not increase manufacturing cost or power consumption.

  In the projector according to the aspect of the invention, it is preferable that the lighting device driving circuit controls a light emission amount of the arc tube.

  With this configuration, it is possible to easily control the amount of illumination light beam emitted from the illumination device by controlling the amount of light emitted from the arc tube.

  In the projector according to the aspect of the invention, it is preferable that the illuminating device is an illuminating device having an LED, and the illuminating device driving circuit controls a light emission amount of the LED.

  With this configuration, the light amount of the illumination light beam emitted from the illumination device can be easily controlled by controlling the light emission amount of the LED.

  In the projector according to the aspect of the invention, it is preferable that a light shielding member for shaping the cross-sectional shape of the illumination light beam is further provided, and the light shielding member is disposed at a position optically substantially conjugate with the electro-optic modulation device.

  With this configuration, the cross-sectional shape of the illumination light beam that illuminates the image forming region of the electro-optic modulation device can be correctly shaped by the function of the light shielding member.

  In the projector according to the aspect of the invention, it is preferable that the rotating prism is disposed at a position substantially optically conjugate with the electro-optic modulation device.

  Also with this configuration, it is possible to configure a projector that has excellent moving image display characteristics and uniform in-plane display characteristics, and does not increase manufacturing cost or power consumption. .

  In the projector according to the aspect of the invention, the electro-optic modulator includes a plurality of electro-optic modulators that modulate a plurality of color lights according to image information corresponding to each color light, and the rotating prism and the plurality of electro-optic modulators. A color separation light guide optical system that is disposed between the optical prism and separates the illumination light beam from the rotating prism into a plurality of color lights and guides the light beams to the plurality of electro-optic modulation devices, and the plurality of electro-optic modulation devices. It is preferable to further include a cross dichroic prism that combines the modulated color lights.

  By configuring in this way, a projector that has excellent moving image display characteristics and uniform in-plane display characteristics, and that does not increase manufacturing cost or power consumption, has excellent image quality (for example, A full color projector (three-plate type) can be realized.

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

Embodiment 1
First, the projector 1000 according to the first embodiment will be described with reference to FIG.
FIG. 1 is a diagram for explaining 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 diagram illustrating the first lens array. FIG. 1D is a diagram illustrating an illumination state on the light shielding member 700, and FIG. 1E is a diagram illustrating an illumination state on the liquid crystal device 400R.
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 and FIG. 1B, the projector 1000 according to the first embodiment uses the illumination device 100 and the illumination light flux from the illumination device 100 as three color lights of red light, green light, and blue light. As an electro-optic modulation device that modulates each of the three color lights separated by the color separation light guide optical system 200 and the color separation light guide optical system 200 according to image information. Three liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500 that synthesizes the color light modulated by these three liquid crystal devices 400R, 400G, and 400B, and light that is synthesized by the cross dichroic prism 500 is projected onto a screen SCR or the like. The projector includes a projection optical system 600 that projects onto a surface.

  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 first small lenses 122 that divide the illumination light beam emitted from the light source device 110 into a plurality of partial light beams. The first lens array 120, the second lens array 130 having a plurality of second small lenses 132 (not shown) corresponding to the plurality of first small lenses 122 of the first lens array 120, and the light source device 110. A polarization conversion element 140 that aligns an emitted illumination light beam having a non-uniform polarization direction with substantially one type of linearly polarized light, and each partial light beam emitted from the polarization conversion element 140 is an illuminated area (a light shielding member described later in the present embodiment). And a superimposing lens 150 for superimposition in an opening 702 of 700.

  The light source device 110 includes an ellipsoidal reflector 114, an arc tube 112 having a light emission center in the vicinity of the first focal point of the ellipsoidal reflector 114, and a collimation that converts the focused light reflected by the ellipsoidal reflector 114 into substantially parallel light. And a lens 118. 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 area toward the arc tube 112.

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 a reflecting member that covers approximately half of the bulb portion of the arc tube 112 and is opposed to the reflective concave surface of the ellipsoidal reflector 114, and is inserted and fixed to the other sealing portion of the arc tube 112. Has been.
By using such an auxiliary mirror 116, light emitted from the arc tube 112 toward the side opposite to the ellipsoidal reflector 114 (illuminated region side) is reflected by the auxiliary mirror 116 toward the arc tube 112. The The light reflected by the auxiliary mirror 116 passes through the arc tube 112 and is emitted toward the ellipsoidal reflector 114, and is further reflected by the reflecting concave surface of the ellipsoidal reflector 114 to be focused at the second focal position. . Therefore, the light emitted from the arc tube 112 toward the opposite side (illuminated area side) of the ellipsoidal reflector 114 is directly emitted from the arc tube 112 toward the ellipsoidal reflector 114 by the auxiliary mirror 116. Similarly, it can be focused on the second focal position of the ellipsoidal reflector 114.

  The collimating lens 118 is a concave lens, and is disposed on the illuminated area side of the ellipsoidal reflector 114. And it is comprised so that the light from the ellipsoidal reflector 114 may be made substantially parallel.

The first lens array 120 has a function as a light beam splitting optical element that splits the light from the collimating lens 118 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax. The first small lens 122 is provided. As shown in FIG. 1C, the first small lenses 122 are arranged in four rows in the horizontal direction and 16 rows in the vertical direction, and “the vertical dimension along the y-axis direction: the horizontal dimension along the x-axis direction”. = 1: 4 rectangle ”.
That is, the first small lens 122 in the first lens array 120 illuminates the illumination light beam emitted from the illumination device 100 along the x-axis direction in the vertical and horizontal directions in the image forming region S of the liquid crystal devices 400R, 400G, and 400B. An illumination light beam having a cross-sectional shape that illuminates the entire image forming region S in the horizontal direction and about 50% of the image forming region S in the vertical direction along the y-axis direction (see FIG. 1E). ), And a planar shape formed of “vertical dimension along the y-axis direction: horizontal dimension along the x-axis direction = 1: 4 rectangle” compressed in the vertical direction.

  The second lens array 130 is an optical element that collects a plurality of partial light beams divided by the first lens array 120 described above, and in the same manner as the first lens array 120, a matrix is formed in a plane orthogonal to the illumination optical axis 100ax. And a plurality of second small lenses 132 arranged in a shape. The second small lens 132 has a planar shape compressed in the vertical direction (y-axis direction) similar to the planar shape of the first small lens 122.

  The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.

  The superimposing lens 150 is an optical element that condenses a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion element 140 and superimposes them on an opening 702 of a light shielding member 700 described later.

  With the illumination device 100 configured as described above, the entire image forming region S in the horizontal direction (x-axis direction) in the image forming region S of the liquid crystal devices 400R, 400G, and 400B, and the vertical direction (y-axis direction). Emits an illumination light beam L having a cross-sectional shape compressed in the longitudinal direction (y-axis direction) so as to illuminate a part of the image forming region S (see FIG. 1D).

In order to shape the cross-sectional shape of the illumination light beam at a position optically conjugate with each first small lens 122 and the liquid crystal devices 400R, 400G, and 400B between the illumination device 100 and the color separation light guide optical system 200. The light shielding member 700 is disposed. As illustrated in FIG. 1D, the light shielding member 700 includes an opening 702 having a planar shape of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 1: 4 rectangle”. ing.
Thereby, the cross-sectional shape of the illumination light beam L divided by the first lens array 120 and superimposed in the opening 702 of the light shielding member 700 via the second lens array 130, the polarization conversion element 140, and the superimposing lens 150 is changed to the liquid crystal device 400R. , 400G, 400B can be correctly shaped into the cross-sectional shape of the illumination light beam L applied to the image forming region S.

The light beam emitted from the illumination device 100 and shaped by the light shielding member 700 enters the rotating prism 770. The rotating prism 770 is disposed between the illumination device 100 and the liquid crystal devices 400R, 400G, and 400B, and is longitudinally (y-axis direction) on the image forming region S in synchronization with the screen writing frequency of the liquid crystal devices 400R, 400G, and 400B. ) Along the illumination light beam. The field lenses 750 and 752 disposed before and after the rotating prism 770 are provided to make light effectively enter the relay lenses 240 and 242 described later.
Details of the rotating prism 770 will be described later.

  As shown in FIG. 1A, the color separation light guide optical system 200 includes dichroic mirrors 210 and 214, reflection mirrors 212, 216, 218, 220, and 222, and relay lenses 240 and 242. . The color separation light guide optical system 200 separates the illumination light beam emitted from the rotating prism 770 into three color lights of red light, green light, and blue light, and the respective color lights are liquid crystal devices 400R, 400G, and 400 to be illuminated. It has a function of leading to 400B. As the color separation light guide optical system 200, 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. Light images shaped by the color separation light guide optical system 200 at the opening 702 of the light shielding member 700 are formed on the image forming regions S of the liquid crystal devices 400R, 400G, and 400B.

  The dichroic mirror 210 transmits the red light component and the green light component of the light emitted from the rotating prism 770 and reflects the blue light component. The blue light component reflected by the dichroic mirror 210 is reflected by the reflection mirror 218, passes through the relay lens 242, is reflected by the reflection mirrors 220 and 222, passes through the field lens 248, and then the blue light liquid crystal device 400 </ b> B. To reach. On the other hand, the red light component and the green light component transmitted through the dichroic mirror 210 are reflected by the reflection mirror 212 and pass through the relay lens 240. Here, of the red light component and the green light component emitted from the relay lens 240, the red light component passes through the dichroic mirror 214, is further reflected by the reflection mirror 216, passes through the field lens 244, and passes through the red light component. Reaches the liquid crystal device 400R. The green light component reflected by the dichroic mirror 214 is further reflected by the reflection mirror 218, passes through the field lens 246, and reaches the liquid crystal device 400G for green light. Note that the field lenses 244, 246, and 248 provided in the front stage of the light paths of the respective color lights of the liquid crystal devices 400R, 400G, and 400B make the partial light beams emitted from the second lens array 130 substantially parallel to the respective principal rays. It is provided for converting into a light flux.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate an illumination light beam according to image information, and are illumination targets of the illumination device 100. Although not shown, incident side polarizing plates are interposed between the field lenses 244, 246, 248 and the liquid crystal devices 400R, 400G, 400B, respectively, and are crossed with the liquid crystal devices 400R, 400G, 400B. Between the dichroic prism 500, an exit side polarizing plate is interposed. 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 on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.
The color image emitted from the cross dichroic prism 500 is 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 is characterized in that a rotating prism 770 is used and an illumination device driving circuit 710 is provided.
Hereinafter, the rotating prism 770 and the illumination device driving circuit 710 in the projector 1000 according to the first embodiment will be described in detail.

1. Rotating Prism FIG. 2 is a diagram showing the relationship between the rotation of the rotating prism 770 and the illumination state on the liquid crystal devices 400R, 400G, and 400B. 2A is a cross-sectional view of the rotating prism 770 viewed along the rotation axis 772, and FIG. 2B is a view of the rotating prism 770 viewed along the illumination optical axis 100ax. FIG. 2C is a diagram illustrating an irradiation state of the illumination light beam L on the image forming region S of the liquid crystal devices 400R, 400G, and 400B.

  The rotating prism 770 is configured to rotate in synchronization with the screen writing scanning of the liquid crystal devices 400R, 400G, and 400B. For this reason, the light emitted from the image P of the virtual center point of the first small lens 122 on the illumination optical axis 100ax is rotated by the rotating prism 770 as shown in FIGS. 2 (a) to 2 (c). , And receives a predetermined refraction by the light passing surface of the rotating prism 770. As a result, in the image forming area S of the liquid crystal devices 400R, 400G, and 400B, the light irradiation area and the light non-irradiation area are sequentially scrolled in synchronization with the screen writing scan.

  For this reason, according to the projector 1000 according to the first embodiment, the illumination light beam L is scanned on the image forming region S of the liquid crystal devices 400R, 400G, and 400B by rotating the rotating prism 770. As a result, if attention is paid to an arbitrary point in the image forming region S of the liquid crystal devices 400R, 400G, and 400B, light is intermittently blocked, so that the moving image display characteristics are improved and the moving image display characteristics are excellent. It becomes like this.

2. Illumination Device Drive Circuit FIGS. 3 to 7 are diagrams for explaining the effect of the illumination device drive circuit 710.

3A to 3D are diagrams showing the illumination state of the illumination light beam L and the tilt angle θ of the rotating prism 770 in the image forming region S of the liquid crystal devices 400R, 400G, and 400B. ) Is a diagram showing the relationship between the tilt angle θ of the rotating prism 770 and the moving speed of the illumination light beam L on the image forming region S. FIG. In addition, the arrow v shown in FIG. 3A and FIG. 3C is a vector display of the moving speed of the illumination light beam L at the virtual center point. FIG. 3B shows the tilt angle θ of the rotating prism 770 in the illumination state shown in FIG. 3A (the illumination light beam L illuminates the central portion in the vertical direction of the image forming region S). 3D shows the tilt angle θ of the rotating prism 770 in the illumination state shown in FIG. 3C (in the state where the illumination light beam L illuminates both ends in the vertical direction of the image forming region S). Show.
3E, the inclination angle θ of the rotating prism 770 when the illumination optical axis 100ax is perpendicularly incident on the rotating prism surface is “inclination angle θ = 0 °” (hereinafter the same in this specification). To do.)

  FIG. 4A is a diagram showing the relationship between the tilt angle of the rotating prism 770 and the light intensity on the image forming area S in the projector according to the comparative example that does not use the illumination device driving circuit, and FIG. FIG. 4C is a diagram showing a light intensity distribution of the screen SCR in the projector according to the example, and FIG. 4C is a diagram showing a relative value of the light intensity on the screen SCR in the projector according to the comparative example.

  FIG. 5 is a block diagram for explaining the illumination device drive circuit 710, the rotation state detection sensor 750, and the image processing circuit 740 in the projector according to the first embodiment. In FIG. 5, the optical elements disposed from the collimating lens 118 to the rotating prism 770 and the optical elements disposed downstream of the rotating prism 770 are not shown.

FIG. 6A is a diagram showing a driving waveform when the lighting device driving circuit 710 controls the light emission quantity of the arc tube 112, and FIG. 6B is a partially enlarged view of FIG. 6A. 6C illustrates the relationship between the tilt angle of the rotating prism 770 and the amount of light emitted from the arc tube 112. FIG. Note that symbols t _{0 to} t ₆ in FIG. 6B correspond to symbols t _{0 to} t ₆ in FIG.

  FIG. 7A is a diagram showing the relationship between the tilt angle of the rotating prism 770 and the light intensity on the image forming area S in the projector 1000 according to the first embodiment, and FIG. 7B is the projector according to the first embodiment. FIG. 7C is a diagram illustrating a relative value of light intensity on the screen SCR in the projector 1000 according to the first embodiment. In FIG. 7A and FIG. 7C, the light intensity at each inclination angle θ is shown as a relative value with respect to the light intensity when the light intensity at the inclination angle θ = 0 ° is 100. .

In the configuration in which the rotating prism 770 is rotated at a constant speed and the illumination light beam L is scanned on the image forming region S of the liquid crystal devices 400R, 400G, and 400B, the position is changed depending on the position of the illumination light beam L on the image forming region S of the liquid crystal device. The moving speed (scanning speed) changes. That is, as shown in FIG. 3, the moving speed of the illumination light beam at both ends in the vertical direction of the image forming region S is faster than the moving speed of the illumination light beam at the central portion in the vertical direction of the image forming region S. For this reason, in a projector (not shown) according to a comparative example that does not use the illumination device drive circuit, as can be seen from FIG. 4A, the vertical direction of the image forming region S in the liquid crystal devices 400R, 400G, and 400B (see FIG. In the y-axis direction), the illuminance at both ends is lower than the illuminance at the central portion in the vertical direction. Similarly, in the screen SCR, as shown in FIGS. The illuminance at both ends (references H ₀ , H ₂ ) is lower than the illuminance at the central part (reference H ₁ ) in the vertical direction (y-axis direction).

  On the other hand, the projector 1000 according to the first embodiment further includes an illumination device driving circuit 710 as shown in FIG. In this illumination device drive circuit 710, as can be seen from FIGS. 4A and 6, the illumination light beam L passes through the central portion in the vertical direction (y-axis direction) in the image forming region S of the liquid crystal devices 400R, 400G, and 400B. In order to reduce the light intensity of the illumination light beam emitted from the light source device 110, the light emission amount of the arc tube 112 is controlled so that the illumination light beam L is in the vertical direction in the image forming region S of the liquid crystal devices 400R, 400G, 400B ( When passing through both ends (y-axis direction), the light emission amount of the arc tube 112 is controlled so as to increase the light amount of the illumination light beam emitted from the light source device 110. That is, the illuminating device driving circuit 710 reduces the illuminance difference generated due to the movement speed (scanning speed) of the illuminating light beam L changing on the image forming area S in the liquid crystal devices 400R, 400G, and 400B. In addition, it has a function of temporally controlling the amount of illumination light beam emitted from the illumination device 100.

  Therefore, according to the projector 1000 according to the first embodiment, as shown in FIG. 7A, the above-described illuminance difference that occurs when the rotating prism 770 is rotated at a constant rotation speed is reduced. Thus, as shown in FIGS. 7B and 7C, a more uniform display can be performed on the entire screen SCR. That is, it has uniform in-plane display characteristics.

  As described above, according to the projector 1000 according to the first embodiment, it is not necessary to change the rotation speed of the rotating prism in an extremely short period. Therefore, it is necessary to use an expensive motor as a motor for driving the rotating prism. In addition, there is no need to frequently accelerate and decelerate the rotational speed of the motor for driving the rotating prism. For this reason, there is no increase in manufacturing cost or power consumption.

  For this reason, according to the projector 1000 according to the first embodiment, the projector 1000 has excellent moving image display characteristics and uniform in-plane display characteristics, and does not increase in manufacturing cost or power consumption.

  In the projector 1000 according to the first embodiment, as illustrated in FIG. 5, a rotation state detection sensor 750 that detects the rotation state of the rotating prism 770 and an output signal of the rotation state detection sensor 750 are processed to process the illumination device drive circuit 710. And a rotation state detection circuit 720 for outputting to the output. The illumination device drive circuit 710 is configured to control the amount of illumination light beam emitted from the illumination device 100 based on the output signal of the rotation state detection circuit 720.

  For this reason, according to the projector 1000 according to the first embodiment, it is possible to perform accurate control corresponding to the rotation state of the rotating prism 770, so that the moving speed (scanning speed) of the illumination light flux is the liquid crystal devices 400R and 400G. , 400B, it is possible to effectively reduce the illuminance difference caused by the change on the image forming area S.

  In the projector 1000 according to the first embodiment, the motor drive circuit 730 drives the motor 774 based on an output signal from the image processing circuit 740 that processes image information, whereby the liquid crystal devices 400R, 400G, and 400B. The rotating prism 770 is configured to rotate in synchronization with the screen writing frequency.

  In the projector 1000 according to the first embodiment, the illumination device drive circuit 710 is configured to control the light emission amount of the arc tube 112, and thus effectively controls the light amount of the illumination light beam emitted from the illumination device 100. can do.

  As described above, the rotating prism 770 and the illumination device driving circuit 710 in the projector 1000 according to the first embodiment have been described in detail. However, the projector 1000 according to the first embodiment also has the following characteristics.

  In the projector 1000 according to the first embodiment, the light source device 110 includes the arc tube 112, the ellipsoidal reflector 114 that reflects light from the arc tube 112, and the parallelization of the light reflected by the ellipsoidal reflector 114. The light source device has a lens 118.

  For this reason, according to the projector 1000 which concerns on Embodiment 1, compared with the light source device using a paraboloid reflector, a more compact light source device is realizable.

  In the projector 1000 according to the first embodiment, the arc tube 112 is provided with an auxiliary mirror 116 that reflects the light emitted from the arc tube 112 toward the illuminated area toward the arc tube 112.

  For this reason, according to the projector 1000 according to the first embodiment, the light emitted from the arc tube 112 toward the illuminated area is reflected toward the arc tube 112. It is not necessary to set the size of the ellipsoidal reflector 114 so as to cover it, and the ellipsoidal reflector 114 can be miniaturized, and the projector 1000 can be miniaturized. This also means that the size of the first lens array 120, the size of the second lens array 130, the size of the polarization conversion element 140, the size of the superimposing lens 150, the size of the color separation optical system 200, etc. This also means that the projector 1000 can be made smaller, and the projector 1000 can be further downsized.

  In the projector 1000 according to the first embodiment, as the electro-optic modulation device, three liquid crystal devices 400R that modulate three color lights emitted from the color separation light guide optical system 200 according to image information corresponding to each color light, 400G and 400B are provided. Further, it is disposed between the rotating prism 770 and the liquid crystal devices 400R, 400G, and 400B, and is a color separation light guide for separating the illumination light beam from the rotating prism 770 into three color lights and guiding them to the liquid crystal devices 400R, 400G, and 400B. It further includes an optical system 200 and a cross dichroic prism 500 that combines the respective color lights modulated by the liquid crystal devices 400R, 400G, and 400B.

  For this reason, according to the projector 1000 according to the first embodiment, a projector that does not significantly reduce light utilization efficiency even when smooth and high-quality moving image display is obtained is replaced with a three-plate type projector that has excellent image quality. A full-color projector can be obtained.

The projector 1000 according to the first embodiment further includes a polarization conversion element 140 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 140 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. A reflection layer that reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax, and one linear polarization component that has passed through the polarization separation layer and the other reflected by the reflection layer. A retardation plate that performs polarization conversion so as to align with any one of the linearly polarized light components.

  For this reason, since the illumination light beam from the light source device 110 can be converted into one kind of linearly polarized light having one polarization axis by the action of the polarization conversion element 140, 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.

  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, the stray light level is reduced, and the contrast is improved.

  In the projector 1000 according to the first embodiment, the configuration in which the lighting device driving circuit 710 controls the light emission amount of the arc tube 112 with the driving waveform as illustrated in FIG. The invention is not limited to this, and there are, for example, the following modifications.

  FIGS. 8 to 12 are diagrams for explaining the function of the illumination device drive circuit in the projector according to the first to fifth modifications of the first embodiment. FIG. 8A is a diagram showing a drive waveform when the lighting device drive circuit in Modification 1 controls the amount of light emitted from the arc tube, and FIG. 8B is a partially enlarged view of FIG. 8A. FIG. 8C is a diagram showing the relationship between the tilt angle of the rotating prism and the amount of light emitted from the arc tube. FIG. 9A is a diagram showing a drive waveform when the lighting device drive circuit in Modification 2 controls the amount of light emitted from the arc tube, and FIG. 9B is a partially enlarged view of FIG. 9A. FIG. 9C is a diagram showing the relationship between the tilt angle of the rotating prism and the amount of light emitted from the arc tube.

  As shown in FIGS. 8A and 8B, the driving waveform when the lighting device drive circuit in the projector according to the modification 1 controls the light emission amount of the arc tube is as shown in FIGS. 8A and 8B. The timing at which the polarity is inverted differs from the drive waveform when the illumination device drive circuit 710 controls the light emission quantity of the arc tube 112.

  As shown in FIGS. 9A and 9B, the driving waveform when the lighting device driving circuit in the projector according to the modification 2 controls the light emission amount of the arc tube is the same as that in the projector 1000 according to the first embodiment. The illumination device drive circuit 710 is different from the drive waveform when the light emission amount of the arc tube 112 is controlled in that it is DC driven.

  As shown in FIG. 10, the driving waveform when the lighting device driving circuit in the projector according to the modification 3 controls the light emission amount of the light emitting tube is as follows. The lighting device driving circuit 710 in the projector 1000 according to the first embodiment has the light emitting tube 112. Compared with the drive waveform when controlling the amount of emitted light, the difference is that the period of polarity inversion is longer.

  As shown in FIG. 11, the driving waveform when the lighting device drive circuit in the projector according to the modification 4 controls the light emission amount of the arc tube is as shown in FIG. Compared with the driving waveform when controlling the difference, the polarity inversion period is short.

  As shown in FIG. 12, the driving waveform when the lighting device drive circuit in the projector according to Modification 5 controls the light emission amount of the light emitting tube is as shown in FIG. 12 by the lighting device drive circuit 710 in the projector 1000 according to the first embodiment. Compared with the drive waveform when controlling the amount of emitted light, the difference is that the period of polarity inversion is shorter.

  As described above, the projector according to the first to fifth modifications differs from the projector 1000 according to the first embodiment in the drive waveform when the lighting device drive circuit controls the light emission amount of the arc tube, but the first embodiment is different from the first embodiment. Similar to the projector 1000, the illuminance difference generated due to the movement speed (scanning speed) of the illumination light beam L changing on the image forming area in the liquid crystal devices 400R, 400G, and 400B (not shown). Is provided with a lighting device drive circuit having a function of temporally controlling the amount of illumination light emitted from the lighting device 100 (not shown). For this reason, also in the projectors according to the first to fifth modifications, as in the case of the projector 1000 according to the first embodiment, the above-described illuminance difference that occurs when the rotating prism is rotated at a constant rotation speed is reduced. As a result, a more uniform display can be performed on the entire screen. That is, it has uniform in-plane display characteristics.

[Embodiment 2]
FIG. 13 is a diagram for explaining a projector 1002 according to the second embodiment. In FIG. 13, the same members as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The projector 1002 according to the second embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment. However, as shown in FIG. The control means of the device drive circuit is different.

  That is, in the projector 1000 according to the first embodiment, the rotation state detection sensor 750 (see FIG. 5) that detects the rotation state of the rotary prism 770 is used as the control unit. The illumination device drive circuit 710 includes: Based on the output signal of the rotation state detection sensor 750, the light quantity of the illumination light beam emitted from the light source device 110 is controlled.

  On the other hand, the projector 1002 according to the second embodiment uses an image processing circuit 742 that processes image information as shown in FIG. 13 instead of the rotation state detection sensor. The rotating prism 770 is configured to rotate at a constant speed based on the synchronization signal from the image processing circuit 742, and the illumination device driving circuit 712 is based on the synchronization signal from the image processing circuit 742. The illumination light flux emitted from the device 110 is configured to be controlled.

  In the projector 1002 according to the second embodiment, the rotation of the rotating prism 770 and the light amount control of the light source device 110 by the illumination device driving circuit 712 are both performed based on the synchronization signal from the image processing circuit 742. For this reason, since the light amount control of the light amount device 110 corresponding to the rotation state of the rotating prism 770 can be accurately performed even with the above configuration, the scanning speed of the illumination light beam can be adjusted to the liquid crystal devices 400R and 400G. , 400B, it is possible to effectively reduce the illuminance difference caused by the change in the image forming area.

  As described above, the projector 1002 according to the second embodiment is different from the projector 1000 according to the first embodiment because the moving speed (scanning speed) of the illumination light flux changes on the image forming area in the liquid crystal device. Although the control means of the illuminating device driving circuit for reducing the illuminance difference is different, the illuminating device that temporally controls the light quantity of the illuminating light beam emitted from the light source device 110 as in the case of the projector 1000 according to the first embodiment. Since the drive circuit 712 is provided, an illuminance difference generated when the rotating prism 770 is rotated at a constant rotation speed is reduced, and a more uniform display can be performed on the entire screen. That is, it has uniform in-plane display characteristics.

  Accordingly, 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 control unit of the illumination device driving circuit, and thus the same as the projector 1000 according to the first embodiment. Has an effect.

[Embodiment 3]
FIG. 14 is a diagram illustrating an optical system of the projector 1004 according to the third embodiment. FIG. 14A is a view of the optical system of the projector 1004 as viewed from above, and FIG. 14B is a view of the optical system of the projector 1004 as viewed from side.

The projector 1004 according to the third embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment. However, as shown in FIG. The color separation light guide optical system has a different configuration.
In other words, in the projector 1004 according to the third embodiment, the color separation light guide optical system 202 has the same direction in which the light irradiation region and the light non-irradiation region are scrolled on the liquid crystal devices 400R, 400G, and 400B. Therefore, a double relay optical system 190 is used.

  As shown in FIG. 14A, the color separation light guide optical system 202 includes dichroic mirrors 260 and 262, a reflection mirror 264, and a double relay optical system 190. The double relay optical system 190 includes relay lenses 191, 192, 194, 195, 197, reflection mirrors 193, 196, and a field lens 198. In addition, a relay lens 754 is disposed in front of the optical path of the color separation light guide optical system 202.

The dichroic mirror 260 reflects the red light component of the light emitted from the rotating prism 770 and transmits the green light component and the blue light component. The red light component reflected by the dichroic mirror 260 is reflected by the reflection mirror 264, passes through the field lens 176R, and reaches the liquid crystal device 400R for red light.
Of the green light component and the blue light component transmitted through the dichroic mirror 260, the green light component is reflected by the dichroic mirror 262, passes through the field lens 176G, and reaches the liquid crystal device 400G for green light. On the other hand, the blue light component transmitted through the dichroic mirror 260 passes through the dichroic mirror 262, passes through the double relay optical system 190, and reaches the blue light liquid crystal device 400B. Field lenses 176R, 176G, and 198 provided in the front stage of the light paths of the respective color lights of the liquid crystal devices 400R, 400G, and 400B convert the partial light beams emitted from the second lens array 130 into light beams that are substantially parallel to the respective principal rays. Provided to convert to.

  Here, the double relay optical system 190 is provided in the optical path of the blue light because the length of the optical path of the blue light is longer than the length of the optical path of the other color light. It is provided to prevent the efficiency from being lowered and to make the direction in which the light irradiation region and the light non-irradiation region are scrolled the same on each of the liquid crystal devices 400R, 400G, and 400B. In the projector 1004 according to the third embodiment, the double relay optical system 190 is used for the blue light path among the three color lights. However, such a double relay is used for the other light paths such as red light. A configuration using an optical system may also be used.

  As described above, the projector 1004 according to the third embodiment is different from the projector 1000 according to the first embodiment in the configuration of the color separation / light guiding optical system, but is in a rotated state as in the case of the projector 1000 according to the first embodiment. Since it includes an illumination device drive circuit (not shown) that temporally controls the amount of illumination light beam emitted from the light source device 110 based on an output signal of a detection sensor (not shown), a rotating prism is provided. The illuminance difference generated when the 770 is rotated at a constant rotation speed is reduced, and a more uniform display can be performed on the entire screen SCR. That is, it has uniform in-plane display characteristics.

  In the projector 1004 according to the third embodiment, as described above, an illumination device driving circuit that temporally controls the amount of illumination light beam emitted from the light source device 110 based on the output signal of the rotation state detection sensor. As in the case of the projector 1002 according to the second embodiment, an illumination device drive circuit that controls the amount of illumination light beam emitted from the light source device 110 based on a synchronization signal from the image processing circuit is provided. It is good also as a structure.

  Accordingly, the projector 1004 according to the third embodiment has the same configuration as the projectors 1000 and 1002 according to the first or second embodiment except for the configuration of the color separation light guide optical system. This has the same effect as the projectors 1000 and 1002.

[Embodiment 4]
FIG. 15 is a diagram illustrating an optical system of the projector 1006 according to the fourth embodiment. FIG. 15A is a view of the optical system of the projector 1006 as viewed from the top, and FIG. 15B is a view of the optical system of the projector 1006 as viewed from the side.

The projector 1006 according to the fourth embodiment basically has a configuration similar to that of the projector 1000 according to the first embodiment. However, as shown in FIGS. 15A and 15B, the embodiment The projector 1000 according to the first embodiment is different from the projector 1000 in the configuration of the illumination device.
That is, in the projector 1006 according to the fourth embodiment, a rod integrator optical system is used as the illumination device 100B.

  The illumination device 100B includes a light source device 110B that emits a convergent illumination light beam toward the illuminated region, an integrator rod 160 that converts the illumination light beam from the light source device 110B into an illumination light beam having a more uniform intensity distribution, and a relay lens. 162. A light shielding member 700 is disposed at a position optically conjugate with the light exit surface of the integrator rod 160 and the liquid crystal devices 400R, 400G, and 400B.

The integrator rod 160 includes a polarization conversion unit 162 that aligns illumination light beams emitted from the light source device 110 </ b> B whose polarization directions are not aligned with each other and substantially one type of linearly polarized light, and a rod unit 164. The polarization conversion unit 162 transmits one linearly polarized light component of the polarized light component included in the illumination light beam from the light source device 110B as it is and reflects the other linearly polarized light component in a direction perpendicular to the illumination optical axis 100Bax. A reflection layer that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100Bax, and one linear polarization component that has been transmitted through the polarization separation layer and the other reflected by the reflection layer. A retardation plate that performs polarization conversion so as to align with any one of the linearly polarized light components.
The light exit surface of the integrator rod 160 has a planar shape composed of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 1: 4 rectangle” compressed in the vertical direction.

  As described above, the projector 1006 according to the fourth embodiment differs from the projector 1000 according to the first embodiment in the configuration of the illumination device, but as in the case of the projector 1000 according to the first embodiment, the rotation state detection sensor (FIG. (Not shown)), an illumination device driving circuit (not shown) that temporally controls the amount of illumination light beam emitted from the light source device 110B is provided. The difference in illuminance generated when rotating at the rotation speed is reduced, and a more uniform display can be performed on the entire screen SCR. That is, it has uniform in-plane display characteristics.

  In the projector 1006 according to the fourth embodiment, as described above, an illumination device drive circuit that temporally controls the amount of illumination light beam emitted from the light source device 110B based on the output signal of the rotation state detection sensor. As in the case of the projector 1002 according to the second embodiment, an illumination device drive circuit that controls the amount of illumination light beam emitted from the light source device 110B based on a synchronization signal from the image processing circuit is provided. It is good also as a structure.

  Therefore, since the projector 1006 according to the fourth embodiment has the same configuration as the projector 1000 or 1002 according to the first or second embodiment except for the configuration of the illumination device, the projector 1000 or 1002 according to the first or second embodiment. The same effect as in the case of.

[Embodiment 5]
FIG. 16 is a diagram illustrating an optical system of a projector 1008 according to the fifth embodiment. FIG. 16A is a view of the optical system of the projector 1008 as viewed from above, and FIG. 16B is a view of the optical system of the projector 1008 as viewed from side.

The projector 1008 according to the fifth embodiment basically has a configuration that is very similar to the projector 1006 according to the fourth embodiment. However, as shown in FIGS. 4 differs from the projector 1006 according to No. 4 in that the arrangement position of the rotating prism and the presence or absence of the light shielding member.
That is, in the projector 1008 according to the fifth embodiment, the rotating prism 770 is disposed at a position optically conjugate with the light exit surface of the integrator rod 160 and the liquid crystal devices 400R, 400G, and 400B. Accordingly, the projector 1008 according to the fifth embodiment does not have a light shielding member.

FIG. 17 is a diagram illustrating the relationship between the rotation of the rotating prism 770 and the illumination state on the liquid crystal devices 400R, 400G, and 400B. 17A is a cross-sectional view of the rotating prism 770 viewed along the rotation axis 772, and FIG. 17B is a view of the rotating prism 770 viewed along the illumination optical axis 100Bax. FIG. 17C is a diagram illustrating an irradiation state of the illumination light beam L on the image forming region S of the liquid crystal devices 400R, 400G, and 400B.
The light emitted from the image P of the virtual center point of the light exit surface of the integrator rod 160 on the illumination optical axis 100Bax is rotated by the rotating prism 770 as shown in FIGS. 17 (a) to 17 (c). A predetermined refraction is received by the light passage surface of the rotating prism 770. As a result, the light irradiation area and the light non-irradiation area are sequentially scrolled in the image forming area S of the liquid crystal devices 400R, 400G, and 400B.

  Therefore, according to the projector 1008 according to the fifth embodiment, similarly to the projector 1006 according to the fourth embodiment, by rotating the rotating prism 770, the image forming area S of the liquid crystal devices 400R, 400G, and 400B is rotated. The illumination light beam L is scanned. As a result, if attention is paid to an arbitrary point in the image forming region S of the liquid crystal devices 400R, 400G, and 400B, light is intermittently blocked, so that the moving image display characteristics are improved and the moving image display characteristics are excellent. It becomes like this.

  As described above, the projector 1008 according to the fifth embodiment is different from the projector 1006 according to the fourth embodiment in terms of the arrangement position of the rotating prism and the presence / absence of the light shielding member, but is similar to the projector 1006 according to the fourth embodiment. Is provided with an illumination device drive circuit (not shown) for temporally controlling the amount of illumination light beam emitted from the illumination device 100B, and thus occurs when the rotating prism 770 is rotated at a constant rotational speed. The illuminance difference to be reduced is reduced, and more uniform display can be performed on the entire screen SCR. That is, it has uniform in-plane display characteristics.

  For this reason, the projector 1008 according to the fifth embodiment has the same effects as those of the projector 1006 according to the fourth embodiment, has excellent moving image display characteristics and uniform in-plane display characteristics, and has a manufacturing cost. The projector does not increase in power consumption or power consumption.

  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 1008 of the above embodiments use the illumination devices 100 and 100B having the arc tube 112, but the present invention is not limited to this, and illumination devices having LEDs may be used. it can. In this case, the illuminating device drive circuit may be configured to control the light emission amount of the LED.

(2) In the projectors 1000 to 1004 of the first to third embodiments, the plane shape of the first small lens 122 of the first lens array 120 is “vertical dimension: lateral dimension = 1: 4 rectangle”. However, the present invention is not limited to this, for example, those having “vertical dimension: horizontal dimension = 9: 32 rectangle” and “vertical dimension: horizontal dimension = 3: 8 rectangle”. Can also be preferably used.

(3) In the projectors 1006 and 1008 of the fourth and fifth embodiments, the planar shape of the light exit surface of the integrator rod 160 is “vertical dimension: lateral dimension = 1: 4 rectangle”. The invention is not limited to this, and for example, those having “vertical dimension: horizontal dimension = 9: 32 rectangle” and “vertical dimension: horizontal dimension = 3: 8 rectangle” are preferably used. Can do.

(4) The projectors 1000 to 1006 according to the first to fourth embodiments have a planar shape of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 1: 4 rectangle” as the light shielding member 700. However, the present invention is not limited to this. For example, “a vertical dimension along the y-axis direction: a horizontal dimension along the x-axis direction = 9: 32 rectangle” It is also possible to use a light shielding member having an opening having a planar shape. In addition, the first small lens of the first lens array has a planar shape other than the planar shape of “vertical dimension along the y-axis direction: lateral dimension along the x-axis direction = 1: 4 rectangle”. In this case, a light-shielding member having an opening having a planar shape similar to the planar shape of the small lens can be used, and the light exit surface of the integrator rod is “vertical dimension along the y-axis direction: x-axis”. In the case of an integrator rod having a planar shape other than the planar shape of “lateral dimension along the direction = 1: 4 rectangle”, an opening having a planar shape similar to the planar shape of the light exit surface of the integrator rod is provided. The light-shielding member provided can also be used.

(5) The projectors 1000 to 1004 of Embodiments 1 to 3 described above include the ellipsoidal reflector 114, the arc tube 112 having a light emission center near the first focal point of the ellipsoidal reflector 114, and the collimating lens 118 as the light source device 110. However, the present invention is not limited to this, and a light source device having a parabolic reflector and an arc tube having an emission center near the focal point of the parabolic reflector is also preferable. Can be used.

(6) In the projectors 1000 to 1008 in the above embodiments, the light source device in which the auxiliary mirror 116 is disposed on the arc tube 112 is used as the light source devices 110 and 110B. However, the present invention is not limited to this. In addition, a light source device in which the auxiliary mirror is not disposed in the arc tube can be preferably used.

(7) In 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 projectors are used. The present invention can also be applied to a projector using the above liquid crystal device.

(8) The projectors 1000 to 1008 of the above embodiments use a liquid crystal device as the electro-optic modulation device, but 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.

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

FIG. 3 is a diagram for explaining a projector 1000 according to the first embodiment. The figure which shows the relationship between rotation of the rotation prism 770, and the illumination state on liquid crystal device 400R, 400G, 400B. The figure shown in order to demonstrate the effect of the illuminating device drive circuit 710. FIG. The figure shown in order to demonstrate the effect of the illuminating device drive circuit 710. FIG. The figure shown in order to demonstrate the effect of the illuminating device drive circuit 710. FIG. The figure shown in order to demonstrate the effect of the illuminating device drive circuit 710. FIG. The figure shown in order to demonstrate the effect of the illuminating device drive circuit 710. FIG. The figure shown in order to demonstrate the function of the illuminating device drive circuit in the projector which concerns on the modification 1. As shown in FIG. The figure shown in order to demonstrate the function of the illuminating device drive circuit in the projector which concerns on the modification 2. As shown in FIG. The figure shown in order to demonstrate the function of the illuminating device drive circuit in the projector which concerns on the modification 3. FIG. The figure shown in order to demonstrate the function of the illuminating device drive circuit in the projector which concerns on the modification 4. FIG. The figure shown in order to demonstrate the function of the illuminating device drive circuit in the projector which concerns on the modification 5. FIG. FIG. 6 is a diagram for explaining a projector 1002 according to a second embodiment. FIG. 10 shows an optical system of a projector 1004 according to a third embodiment. FIG. 10 shows an optical system of a projector 1006 according to a fourth embodiment. FIG. 10 shows an optical system of a projector 1008 according to a fifth embodiment. The figure which shows the relationship between rotation of the rotation prism 770, and the illumination state on liquid crystal device 400R, 400G, 400B. The figure shown in order to demonstrate the projector 900 of the past. FIG. 6 is a diagram showing the rotation speed of a rotating prism 960 in a conventional projector 900.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100,100B ... Illuminating device, 100ax, 100Bax ... Illumination optical axis, 110, 110B, 910 ... Light source device, 112,912 ... Arc tube, 114,914 ... Ellipsoidal reflector, 116 ... Auxiliary mirror, 118 ... Parallelizing lens, 120, 920: first lens array, 122: first small lens, 130, 930: second lens array, 140: polarization conversion element, 150, 950: superposition lens, 160: integrator rod, 162: polarization conversion unit, 164 ... Rod part, 166, 176R, 176G, 198, 244, 246, 248, 750, 752, 952 ... Field lens, 190 ... Double relay optical system, 191, 192, 194, 195, 197, 240, 242, 754 ... Relay lens, 193, 196, 212, 216, 218, 220, 2 DESCRIPTION OF SYMBOLS 2,264 ... Reflection mirror, 200, 202 ... Color separation light guide optical system, 210, 214, 260, 262 ... Dichroic mirror, 400R, 400G, 400B, 970 ... Liquid crystal device, 500 ... Cross dichroic prism, 600, 980 ... Projection optical system, 700 ... light shielding member, 702 ... aperture, 710, 712 ... lighting device drive circuit, 720 ... rotation state detection circuit, 730, 732 ... motor drive circuit, 740, 742 ... image processing circuit, 750 ... rotation state detection Sensor, 770, 960... Rotating prism, 772... Rotating shaft, 774... Motor, 900, 1000, 1004, 1006, 1008. Image of the virtual center point of the light exit surface of the lens or integrator rod, S: Image forming area SCR ... screen.

Claims (9)

An electro-optic modulator that modulates the illumination light beam according to image information;
A projection optical system for projecting the illumination light beam modulated by the electro-optic modulation device;
Illumination luminous flux having a cross-sectional shape compressed in the other direction so as to illuminate the entire image forming area in one direction in the image forming area of the electro-optic modulator and a part of the image forming area in the other direction. A lighting device for injecting,
A projector comprising: a rotating prism that rotates at a constant speed and scans the illumination light beam from the illumination device along the other direction in the image forming region of the electro-optic modulation device;
Illumination for controlling the amount of illumination light beam emitted from the illumination device so as to reduce the illuminance difference caused by the scanning speed of the illumination light beam changing on the image forming area in the electro-optic modulation device A projector further comprising a device driving circuit. The projector according to claim 1, wherein
A rotation state detection sensor for detecting a rotation state of the rotation prism;
The projector is characterized in that the illumination device drive circuit controls the amount of illumination light beam emitted from the illumination device based on an output signal of the rotation state detection sensor. The projector according to claim 1, wherein
An image processing circuit for processing image information;
The rotating prism is configured to rotate at a constant speed based on a synchronization signal from the image processing circuit,
The projector is characterized in that the illumination device drive circuit controls the amount of illumination light beam emitted from the illumination device based on a synchronization signal from the image processing circuit. The projector according to any one of claims 1 to 3,
The illumination device includes a light-emitting tube and a reflector, a light source device that emits an illumination light beam toward the illuminated area, and 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 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 the plurality of second small lenses of the second lens array. It is an illuminating device having a superimposing lens for superimposing each emitted partial luminous flux in the illumination area,
The projector according to claim 1, wherein the first small lens has a planar shape compressed in the other direction. The projector according to any one of claims 1 to 3,
The illumination device has a light emitting tube and an ellipsoidal reflector and 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 intensity distribution A lighting device having an integrator rod;
The light emitting surface of the integrator rod has a planar shape compressed in the other direction. The projector according to claim 4 or 5,
The projector according to claim 1, wherein the lighting device driving circuit controls a light emission amount of the arc tube. The projector according to any one of claims 1 to 3,
The lighting device is a lighting device having an LED,
The illumination device driving circuit controls a light emission amount of the LED. In the projector according to any one of claims 1 to 7,
A light shielding member for shaping the cross-sectional shape of the illumination light beam;
The projector, wherein the light shielding member is disposed at a position optically conjugate with the electro-optic modulation device. In the projector according to any one of claims 1 to 7,
The projector according to claim 1, wherein the rotating prism is disposed at a position optically conjugate with the electro-optic modulator.