JP2004085780A - Holding mechanism for rod integrator, adjusting mechanism for illumination optical system, and projector using them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform positioning adjustment of the light emitting surface of a rod integrator while realizing the positional adjustment of the light incident surface of the rod integrator. <P>SOLUTION: The holding mechanism for the rod integrator is equipped with a holding body for holding the rod integrator, and a supporting body for supporting the holding body. The holding body is equipped with a holding part for holding the rod integrator, and an adhering and fixing part for fixing the attitude of the holding body after adjusting the attitude of the holding body. The supporting body is equipped with a supporting part coming into contact with the holding body and supporting the holding body to freely turn around three axes orthogonal to each other with the contact part nearly as center in the case of adjusting the attitude of the holding body, and an adhering groove part for fixing the attitude of the holding body by fixing the adhering and fixing part by adhesion after the adhering and fixing part is inserted and the attitude of the holding body is fixed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projector (projection display device) that projects and displays an image, and more particularly to a holding mechanism that adjustably holds an arrangement position of a rod integrator for achieving uniform illuminance of illumination light.
[0002]
[Prior art]
Generally, in a projector, a light modulator (also referred to as an electro-optical device) is illuminated by light (illumination light) emitted from a light source device. The light modulation device modulates light applied to a light incident surface (also referred to as a “light modulation region” or a “pixel region”) according to an image signal (image information) and emits the light as image light representing an image. . The projection optical system displays an image by projecting image light emitted from the light modulation device on a screen.
[0003]
In such a projector, the uniformity of the illuminance of the light illuminating the light modulation device is generally increased by disposing the rod integrator in the optical path of the illumination optical system from the light source device to the light modulation device.
[0004]
In addition, the illumination area of the light modulation device usually uses a relay lens (relay optical system) provided between the rod integrator and the light modulation device to change the light image on the light exit surface of the rod integrator on the light modulation device. The area is illuminated by being imaged.
[0005]
[Problems to be solved by the invention]
The image projected by the projector is preferably brighter, and it is desired that the illumination light emitted from the light source device be more efficiently applied to the light modulation area. Therefore, in order to satisfy this demand, it is conceivable to minimize the amount of light that does not irradiate the light modulation region (hereinafter, referred to as “margin”) among the light illuminating the light modulation device. To reduce this margin, for example, it may be necessary to adjust the position of the light exit surface of the rod integrator with respect to the relay lens.
[0006]
On the other hand, if the position of the light incident surface of the rod integrator deviates from an appropriate position, the amount of light that can be incident on the rod integrator among the light emitted from the light source device decreases. As the amount of light incident on the rod integrator decreases, the illuminance of the light illuminating the light modulator decreases. In order to suppress the decrease in the amount of light incident on the rod integrator and allow the light to enter the rod integrator as efficiently as possible, it may be necessary to adjust the position of the light incident surface of the rod integrator.
[0007]
As described above, it is desired to establish a technique for adjusting the position of the light exit surface of the rod integrator while realizing the position adjustment of the light incident surface of the rod integrator.
[0008]
The present invention has been made to solve the above-described problems in the related art, and it is possible to adjust the position of the light exit surface of the rod integrator while realizing the position adjustment of the light incident surface of the rod integrator. It aims to provide technology.
[0009]
[Means for Solving the Problems and Their Functions and Effects]
In order to solve at least a part of the problems described above, the present invention relates to a rod integrator holding mechanism,
A holding body for holding the rod integrator,
A support for supporting the holder,
With
The holder is
A holding unit for holding the rod integrator,
After adjusting the posture of the holding body, an adhesive fixing portion for fixing the posture of the holding body,
With
The support is
A contact portion that contacts the holding member and, when adjusting the posture of the holding member, is rotatable around three axes orthogonal to each other with the contact portion substantially as a center;
The adhesive fixing portion is inserted, after adjusting the posture of the holding body, after fixing the adhesive fixing portion by bonding, an adhesive groove portion to fix the posture of the holding body,
It is characterized by having.
[0010]
According to this holding mechanism, since the attitude of the rod integrator can be adjusted, it is possible to adjust the position of the light exit surface of the rod integrator while adjusting the position of the light incident surface of the rod integrator.
[0011]
Here, the adhesive fixing portion has an adhesive surface perpendicular to a central axis of the rod integrator held by the holding portion,
It is preferable that the adhesive groove has a shape that allows the adhesive fixing portion to rotate in accordance with the rotation about the three axes about the contact portion of the support portion.
[0012]
With this configuration, the posture of the holder can be fixed by bonding and fixing the adhesive fixing portion in the adhesive groove, and the holder is orthogonal to each other with the contact portion of the support portion being substantially at the center. It can be rotated around three axes.
[0013]
In the holding mechanism,
It is preferable that the supporting portion supports the holding body at an end of the holding portion on the side where the light incident surface of the rod integrator is arranged.
[0014]
With this configuration, position adjustment on the light exit surface side can be realized with reference to the position of the light incident surface of the rod integrator.
[0015]
In addition, it is preferable that the tip of the supporting portion is formed of a substantially hemispherical projection.
[0016]
With this configuration, it is easy to freely rotate the holding member around three axes orthogonal to each other, with the contact portion of the support portion being substantially at the center.
[0017]
Further, it is preferable that the holding body has a concave portion having a shape corresponding to the tip shape of the projection at a portion supported by the support portion.
[0018]
With this configuration, since the concave portion of the holding body has a shape corresponding to the tip shape of the supporting portion, the holding body can be freely rotated about three axes orthogonal to each other with the supporting portion being substantially at the center. Easy.
[0019]
The concave portion may have a substantially semi-cylindrical shape that is long in a direction along a central axis of the rod integrator held by the holding portion.
[0020]
With this configuration, the position of the holder that comes into contact with the support portion can be shifted along the longitudinal direction of the concave portion, so that the position along the center axis direction of the rod integrator can be adjusted.
[0021]
Further, the support may have a long mounting screw hole along a predetermined direction.
[0022]
If the predetermined direction is, for example, the optical axis direction of a device using a rod integrator, the entire holding mechanism can be displaced along the optical axis direction. The position along can be adjusted.
[0023]
Further, the present invention provides a light source device for emitting condensed light, a rod integrator for equalizing the illuminance of the condensed light emitted from the light source device, and a light image on a light exit surface of the integrator rod. An imaging mechanism in a predetermined area, and a relay optical system for illuminating the predetermined area, and an adjustment mechanism for an illumination optical system including:
It is characterized by comprising a holding mechanism of the rod integrator according to the above invention.
[0024]
Since the adjusting mechanism of the illumination optical system of the present invention includes the rod integrator holding mechanism of the present invention, the position of the light emitting surface of the rod integrator is adjusted while the position of the light incident surface of the rod integrator is adjusted. be able to. Thereby, it is possible to efficiently irradiate the illumination light emitted from the illumination optical system to a predetermined area.
[0025]
Further, the present invention is a projector for projecting an image,
A light source device for emitting condensed light,
A rod integrator for equalizing the illuminance of the condensed light emitted from the light source device,
A light modulator that emits light incident from a light incident surface as image light representing an image according to a given image signal,
While forming an image of light on the light exit surface of the integrator rod in an area including at least the light incident surface of the reflection type light modulator, light emitted from the integrator rod is incident on the light incident surface of the light modulator. A relay optical system for inputting light,
A projection optical system that projects an image represented by image light emitted from the light modulation device,
It is characterized by comprising a holding mechanism of the rod integrator according to the above invention.
[0026]
Since the projector of the present invention has the rod integrator holding mechanism, it is possible to adjust the position of the light exit surface of the rod integrator while realizing the position adjustment of the light incident surface of the rod integrator. Accordingly, light emitted from the rod integrator can be efficiently incident on the light incident surface of the light modulation device, and a brighter projected image can be obtained.
[0027]
Hereinafter, embodiments of the present invention will be described in the following order based on examples.
A. Schematic configuration of the projector:
B. First embodiment:
B1. Configuration of rod integrator holding mechanism:
B2. Mounting of rod integrator on holder:
B3. Adjustment by rod integrator holding mechanism:
B4. Effect of holding mechanism of rod integrator
C. Second embodiment:
D. Modification:
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
A. Schematic configuration of the projector:
FIG. 1 is a plan view showing a schematic configuration of a projector to which a rod integrator holding mechanism of the present invention is applied. The projector 1000 includes a light source device 100, a color wheel 200, a rod integrator 300 mounted on a holding mechanism of an embodiment described later, a relay optical system 400, a reflection mirror 500, a field lens 600, and a reflection type light. A modulation device 700 and a projection lens (projection optical system) 800 are sequentially arranged along a system optical axis 1000ax. Each of these optical elements is mounted at each mounting position provided on a mounting guide (not shown). In the following, a direction parallel to the system optical axis 1000ax from the light source device 100 to the reflection mirror 500 is referred to as a z direction, a direction perpendicular to the z direction in a horizontal plane is referred to as an x direction, and a direction perpendicular to the z direction and the x direction. Is the y direction.
[0029]
Light emitted from the light source device 100 is condensed light that is substantially converged at a point on the system optical axis 1000ax intersecting with the light incident surface so as to efficiently enter the light incident surface of the rod integrator 300. . Specifically, the light source device 100 includes an elliptical reflector 110 having a spheroidal reflective surface, and a light source lamp 120 using a high-pressure discharge lamp such as a high-pressure mercury lamp or a metal halide lamp. The light source lamp 120 is disposed at the position of the first focal point of the elliptical reflector 110, and the light emitted from the light source device 100 is substantially focused at the second focal point of the elliptical reflector 110. The rod integrator 300 is arranged such that the center on the light incident surface coincides with the second focal point of the elliptical reflector 110. The rod integrator 300 is held by a holding mechanism described later so that the center axis 300ax of the rod integrator 300 coincides with the system optical axis 1000ax so that the center of the light incident surface coincides with the second focal point of the elliptical reflector 110. Be placed.
[0030]
As the light source device, a reflector having a paraboloid-shaped reflecting surface may be used. However, in this case, since the emitted light is substantially parallel light, it is necessary to add a lens to collect the light.
[0031]
The size of the arc image of the light source lamp 120 (the size in the horizontal or vertical direction) is DA, and an image formed on the light incident surface of the rod integrator 300 (hereinafter, referred to as a “secondary light source image”). ) Is the DSP (the size in the horizontal or vertical direction) and the first and second focal lengths of the elliptical reflector 110 are f1 and f2, the size DSP of the secondary light source image is given by the following equation. expressed.
[0032]
DSP = DA · f2 / f1 (1)
[0033]
As can be seen from the above equation (1), it is possible to adjust the size of the secondary light source image by appropriately using elliptical reflectors having different first focal lengths f1 or second focal lengths f2. Usually, the size DSP of the secondary light source image is set to be smaller than the size of the light incident surface of the rod integrator 300.
[0034]
FIG. 2 is an enlarged perspective view schematically showing the rod integrator 300. The rod integrator 300 is a rod having a substantially quadrangular prism shape formed by combining four glass plates. The inside of the rod integrator 300 from the light incident surface 302 to the light exit surface 304 has a substantially rectangular hollow. A reflection mirror is formed on the hollow inner surface. Usually, this reflection mirror is formed by forming a dielectric multilayer film or a reflection film such as an aluminum film or a silver film on a glass plate.
[0035]
Light that has entered the inside from the light incident surface 302 of the rod integrator 300 exits from the light exit surface 304 while being internally reflected. The rod integrator 300 repeats the reflection by the internal reflection mirror, so that even if the illuminance distribution of the light incident from the light incident surface 302 is not uniform, the rod integrator 300 converts the illuminance distribution into uniform light and outputs the light outgoing surface It has the function of ejecting from
[0036]
The relay optical system 400 of FIG. 1 has a function of forming an image of light on the light exit surface 304 (FIG. 2) of the rod integrator 300 at a predetermined magnification on a region including the light modulation region of the reflection type light modulation device 700. , And is constituted by at least one or more lenses. Note that the region of the light image formed on the region including the light modulation region of the reflection type light modulation device 700 corresponds to the illumination region.
[0037]
It is preferable that the shape of the light exit surface 304 of the rod integrator 300 be such that the contour shape of the illumination area is similar to the contour of the light modulation area.
[0038]
The reflection mirror 500 reflects the light emitted from the relay optical system 400 via the field lens 600 so as to illuminate a region including the light modulation region of the reflection type light modulation device 700.
[0039]
The reflection-type light modulation device 700 reflects image light representing an image by reflecting illumination light applied to a light modulation region by a micromirror corresponding to each pixel in accordance with an image signal (image information). There is used a reflection direction control type light modulation device having a function of emitting light toward the side. As the reflection direction control type optical modulator, for example, there is a digital micromirror device (also referred to as DMD, which is a registered trademark of Texas Instruments (TI)). The image light emitted from the reflection type light modulation device 700 is projected via the field lens 600 and the projection lens 800. Thus, the image represented by the image light is projected and displayed.
[0040]
Note that the reflection mirror 500 has a system optical axis 1000ax from the reflection mirror 500 to the reflection type light modulation device 700 because of a functional limitation on reflection of the reflection type light modulation device 700 which is a reflection direction control type light modulation device. In addition, a predetermined inclination with respect to the system optical axis 1000ax from the reflection type light modulation device 700 to the projection lens 800 (the axis which coincides with the central axis 700ax perpendicular to the plane including the light modulation region of the reflection type light modulation device 700). It is arranged to have. However, the reflection mirror 500 can be omitted depending on the arrangement of the optical system from the light source device 100 to the relay optical system 400. Further, the number of the reflecting mirrors 500 is not necessarily one, and a plurality of reflecting mirrors can be combined.
[0041]
The “light modulation region” of the reflection type light modulation device 700 is a region where the irradiated light can be used as image light, that is, a region where micromirrors corresponding to the above-described pixels are formed. Note that the “predetermined inclination” is not particularly problematic in the present invention, and thus the description is omitted.
[0042]
The color wheel 200 is a disk-shaped color filter rotatably provided around the rotation axis 210ax. In the color wheel 200, transmission color filters corresponding to the three primary colors of light (red, green, and blue) are formed along the rotation direction, and the color wheel 200 is located near the light incident surface of the rod integrator 300 or at the light exit surface. It is arranged at a nearby position. Light incident on the color wheel 200 irradiates the red, green, and blue color filter regions cyclically at regular intervals according to the rotation of the color wheel 200. As a result, the light passing through the color wheel 200 cyclically changes to red light (R), green light (G), and blue light (B) according to the rotation of the color wheel 200. Thus, it is possible to display a color image by the respective image lights of R, G, and B cyclically formed by the reflection type light modulation device 700. Note that the color wheel 200 can be omitted, and in this case, the projected image is a monochrome image.
[0043]
B. First embodiment:
B1. Configuration of rod integrator holding mechanism:
The rod integrator 300 is mounted on the holding mechanism 2000 of the present embodiment, and is mounted on a mounting guide of the projector 1000. FIG. 3 is a perspective view showing an overview of the integrator holding mechanism 2000. FIG. 4 is an exploded perspective view showing an integrator holding mechanism 2000 in an exploded state. FIGS. 3A and 4A are perspective views of the rod integrator 300 as viewed from the light incident surface 302 side, and FIGS. 3B and 4B are light exit surfaces of the rod integrator 300. It is the perspective view seen from 304 side.
[0044]
As shown in FIGS. 3 and 4, the integrator holding mechanism 2000 includes a holder 2100 on which the rod integrator 300 is mounted, and a support 2200 for supporting the holder 2100.
[0045]
FIG. 5 is a perspective view showing an outline of the holding body 2100. FIG. 5A is a perspective view of the rod integrator 300 as seen from the light incident surface 302 side, and FIG. 5B is a perspective view of the rod integrator 300, which is the light exit surface 304 side. It is the perspective view seen from. The holding body 2100 includes a holding portion 2120 having a holding surface 2122 for fixing and holding the rod integrator 300, an adhesive fixing portion 2130 provided on one side of the holding portion 2120, and a holding surface of the holding portion 2120. 2122 and adjustment jig receiving portions 2140 provided on both side surfaces.
[0046]
The holding surface 2122 of the holding portion 2120 is provided with two holes 2124 and 2126 penetrating to the back surface 2128 of the holding surface 2122. These holes 2124 and 2126 are used when the rod integrator 300 is mounted on the holder 2100 using a rod integrator mounting jig described later. In addition, a support receiving groove 2110 for receiving a support portion 2210 of a support 2200 described later is provided at the center of the incident surface side end of the back surface 2128 of the holding surface 2122.
[0047]
The adhesive fixing portion 2130 has two adhesive surfaces 2132 substantially perpendicular to the holding surface 2122, that is, substantially perpendicular to the central axis 300ax (see FIG. 2) of the rod integrator 300 mounted on the holding surface 2122.
[0048]
The adjusting jig receiving portion 2140 has a first jig receiving portion 2142 provided at the incident side end of the holding portion 2120 and a second jig receiving portion 2144 provided at the emitting side end. ing. On a side surface of the second jig receiving portion 2144, a hook hole 2146 for hooking a second adjustment arm of an integrator adjustment jig described later is provided. Note that the two first jig receiving portions 2142 have different shapes on the left and right. This is because, as shown in FIG. 1, the color wheel 200 is arranged near the incident side, and it is necessary to secure a space for this arrangement. If it is not necessary to secure this space, the two first self-supporting portions 2142 may have the same shape on the left and right. The same applies to the second jig receiving portion 2144. Further, the first jig receiving portion and the second jig receiving portion may be formed into an integral shape by being connected.
[0049]
The hatched portion 2129 in the figure will be described later.
[0050]
FIG. 6 is a perspective view showing an overview of the support 2200. FIG. 6A is a perspective view of the rod integrator 300 as seen from the incident side where the light incident surface 302 is arranged, and FIG. 6B is an exit side of the rod integrator 300 where the light exit surface 304 is arranged. It is the perspective view seen from. The support body 2200 includes a support base 2220 having a support part 2210 at an upper part, an adhesive groove 2230 provided at a position corresponding to the adhesive fixing part 2130 of the holder 2100 on the side surface in the x direction of the support base 2220, It has a pedestal portion 2240 for mounting the 2202 and the bonding groove portion 2230 to the mounting position of the mounting guide.
[0051]
The bonding groove 2230 is provided with a groove along the x direction. The side wall surface 2232 of this groove has a plane perpendicular to the z-axis as described later.
[0052]
At four corners of the pedestal portion 2240, screw holes 2242-1 and pin holes 2242-2 for attachment are provided. The support 2200, that is, the integrator holding mechanism 2000 is mounted on a mounting guide via two screw holes 2242-1 by a mounting screw which is positioned by a pin provided in a mounting guide (not shown) and a pin hole 2222-2, and then mounted. .
[0053]
The support portion 2210 has a substantially hemispherical protrusion at the tip. The support receiving groove 2110 (FIG. 5) of the holder 2100 has a groove having a shape corresponding to the substantially hemispherical projection of the support portion 2210. This groove has a substantially semi-cylindrical shape elongated in the z direction.
[0054]
The hatched portion 2248 in the figure will be described later.
[0055]
3 and 4 is configured by engaging the support receiving groove 2110 of the holder 2100 with the support portion 2210 of the support 2200. The holder 2100 is rotatably supported by the engaging portion 2300 about the center of the substantially hemispherical tip portion of the support portion 2210. The rotation direction is a rotation direction around the y-axis, a rotation direction around the x-axis, and a rotation direction around the z-axis. Therefore, when the rod integrator holding mechanism 2000 is mounted on the projector 1000 (FIG. 1), the tilt of the central axis 300ax of the rod integrator 300 with respect to the system optical axis 1000ax in the x direction is caused by rotation around the y axis. Can be adjusted. Further, the rotation of the center axis 300ax of the rod integrator 300 with respect to the system optical axis 1000ax in the y direction can be adjusted by the rotation about the x axis. Further, the rotation of the rod integrator 300 about the z axis can be adjusted by the rotation about the z axis. The adjustment of each inclination of the rod integrator 300 will be described later.
[0056]
Further, as described above, the support receiving groove 2110 of the holding body 2100 has a substantially semi-cylindrical shape that is long in the z direction, and the position of the support portion 2210 in the support receiving groove 2110 of the holding body 2100 can be shifted. Therefore, the position of the holder 2100 in the z direction can be shifted with respect to the support 2200. Thus, when the rod integrator holding mechanism 2000 is mounted on the projector 1000 (FIG. 1), the rod integrator 300 mounted on the holder 2100 has the z direction, that is, the direction along the system optical axis 1000ax. Can be adjusted. However, the adjustment range in the z direction is limited by the fixing unit 2400 as described later.
[0057]
3 and 4 includes an adhesive fixing portion 2130 of the holder 2100 and an adhesive groove 2230 of the support 2200. FIG. 7 is an explanatory diagram showing the fixing portion 2400 in an enlarged manner. 7A is a plan view of the fixed part 2400 viewed from the y direction, FIG. 7B is a side view of the fixed part 2400 viewed from the x direction, and FIG. 7C is a view of the fixed part 2400 viewed from the z direction. FIG.
[0058]
Adjustment of the position (posture) of the rod integrator 300 mounted on the holder 2100 is performed by rotating the engagement portion 2300 around the x axis, the y axis, and the z axis as described above. You.
[0059]
Then, the position (posture) of the holder 2100 is fixed by pouring an adhesive or the like into the gaps D1 and D2 between the side wall surface 2232 of the groove of the bonding groove portion 2230 and the bonding surface 2132 of the bonding fixing portion 2130 and curing the same. . As a result, the posture of the holder 2100 with respect to the support 2200 is fixed, and the position of the rod integrator 300 mounted on the holder 2100 is fixed.
[0060]
Here, as described above, the adjustment of the position (posture) of the rod integrator 300 mounted on the holding body 2100 is performed around the x-axis, the y-axis, and the z-axis around the engagement portion 2300 as described above. 7 (A), 7 (B), and 7 (C), the adhesive fixing portion 2130 is also rotated by rotating it around. The portion 2210) rotates around the x axis, around the y axis, and around the z axis. For this reason, in order to rotate the rod integrator 300 mounted on the holder 2100 around the x-axis, the y-axis, and the z-axis around the engagement portion 2300 (the support portion 2210), it is necessary to rotate the rod integrator 300 inside the bonding groove 2230. It is necessary to allow rotation around the x-axis, around the y-axis, and around the z-axis about the engaging portion 2300 (support portion 2210) of the adhesive fixing portion 2130.
[0061]
Therefore, the gaps D1 and D2 between the bonding surface 2132 of the bonding and fixing portion 2130 and the side wall surface 2232 of the groove of the bonding groove 2230 need to be large enough to allow these rotations. Further, in order to widen the rotation range, it is preferable to increase the gap.
[0062]
On the other hand, in order to fix the posture of the holding body 2100, it is necessary to secure the adhesive strength between the bonding surface 2132 of the bonding and fixing portion 2130 and the side wall surface 2232 of the groove of the bonding groove 2230. In order to secure this adhesive strength, it is preferable to reduce the gaps D1 and D2 between the adhesive surface 2132 and the side wall surface 2232.
[0063]
Therefore, the gaps D1 and D2 between the bonding surface 2132 of the bonding and fixing portion 2130 and the side wall surface 2232 of the groove of the bonding groove portion 2230 secure the rotation of the bonding and fixing portion 2130 in the bonding groove 2230 and the bonding strength. It must be within the size that can be done.
[0064]
In consideration of the above points, it is preferable that the bonding surface 2132 of the bonding and fixing portion 2130 be a plane substantially perpendicular to the central axis 300ax of the rod integrator 300 mounted on the holding surface 2122. Further, it is preferable that the side wall surface 2232 of the groove of the bonding groove portion 2230 is also flat. In addition, it is preferable that the size of the bonding surface 2132 is set to a size that ensures a sufficient bonding strength.
[0065]
The gaps D1 and D2 between the groove of the adhesive groove portion 2230 and the side wall surface 2232 of the groove depend on the material forming the holder 2100, the size of the holder 2100, and the size of the bonding surface 2132, but usually about 0.3 mm. Is done.
[0066]
Note that the holder 2100 and the support 2200 can be generally formed using a resin material. When the holder 2100 and the support 2200 are formed of a resin material, it is preferable to provide a reflector on the side surface (incident side surface) 2248 (FIG. 6) on the incident surface side of the support 2200. In the projector 1000 of FIG. 1, light emitted from the light source device 100 is collected so as to enter the light incident surface 302 of the rod integrator 300. This condensed light is incident on the light incident surface 302 of the rod integrator 300. Therefore, normally, the light is not irradiated on the incident side surface 2249 of the support 2200. However, the heat generated by the condensed light may cause deterioration or deformation of the incident side surface 2248 in some cases. In addition, when the position adjustment of the rod integrator 300 described later is insufficient and light is applied to the incident side surface 2248, this effect becomes more remarkable. The provision of the reflection plate on the incident side surface 2248 is for preventing this influence.
[0067]
Similarly, a reflection plate may be provided on the side surface (incident side surface) 2129 on the incident surface side of the holder 2100.
[0068]
Alternatively, the support 2200 may be formed using a heat-resistant metal material (aluminum, magnesium, or the like). The same applies to the holder 2100. In these cases, there is no need to provide a reflector.
[0069]
B2. Mounting of rod integrator on holder:
The mounting of the rod integrator 300 on the holder 2100 can be performed, for example, as described below. FIG. 8 is an explanatory diagram showing a method of mounting the rod integrator 300 on the holder 2100. The mounting of the rod integrator 300 on the holder 2100 is performed using a mounting jig 3000. As shown in FIG. 8A, the holder 2100 is mounted on the holder mounting surface 3110 of the left side wall 3100 of the mounting jig 3000 such that the holding surface 2120 of the holder 2100 faces the right side wall 3200. I do. FIG. 9 is an explanatory diagram showing a method of mounting the holder 2100 on the holder mounting surface 3110. As shown in FIG. 9, protrusions 3112 and 3114 corresponding to the two holes 2122 and 2124 provided in the holder 2120 of the holder 2100 are provided on the holder mounting surface 3110. By inserting these two projections 3112 and 3114 into the two holes 2122 and 2124, the holder 2100 is placed on the holder placement surface 3110.
[0070]
The rod integrator 300 is mounted on the rod mounting surface 3220 of the right side wall 3200 in FIG. 8A at a position corresponding to the holding surface 2120 of the holder 2100 mounted on the left holder mounting surface 3110. Is placed. FIG. 10 is an explanatory diagram illustrating a method of mounting the rod integrator 300 on the rod mounting surface 3220. As shown in FIG. 10, two lower projections 3222 and 3224 and one lateral projection 3226 are provided on the rod mounting surface 3220. The side surface of the rod integrator 300 is brought into contact with the two projections 3222 and 3224, and the surface on the light incident surface 304 side is brought into contact with one projection 3226, so that the rod integrator 300 is mounted on the rod mounting surface 3220. The projections 3222, 3224, and 3226 are formed such that the rod integrator 300 is placed exactly at a position corresponding to the holding surface 2122 of the holder 2100 placed on the holder placement surface 3110. ing.
[0071]
Then, as shown in FIG. 8B, the right side wall 3200 having the rod mounting surface 3220 is slid along the guide 3300 in the direction of the left side wall 3100 having the holder mounting surface 3110 to be held. The holding surface 2122 of the body 2100 and the rod integrator 300 are brought into contact with each other and combined, and fixed with an adhesive. Thus, the rod integrator 300 can be mounted and fixed to the holding unit 2100.
[0072]
However, the method of mounting the rod integrator 300 on the holder 2100 using the mounting jig 3000 is an example, and is not limited to this. As long as the rod integrator 300 can be mounted on the holding surface 2122 of the holder 2100 with high accuracy, any mounting jig may be used, and the rod integrator 300 may be mounted by any method.
[0073]
B3. Adjustment by rod integrator holding mechanism:
Adjustment of the position (posture) of the rod integrator 300 by the holding mechanism 2000 in a state where the rod integrator 300 is mounted on the projector 1000 (FIG. 1) is executed as described below.
[0074]
FIG. 11 is an enlarged perspective view showing the holding mechanism 2000 when the position adjustment of the rod integrator 300 is performed. The front ends of a pair of first adjustment arms AM1 and AM2 of an adjustment jig (not shown) are pressed onto the upper surface of the first jig receiving portion 2142 of the holder 2100 from above. In the second jig receiving portion 2144 of the holder 2100, a pair of second adjusting arms AM3 and AM4 of an adjusting jig (not shown) is provided with a hole 2146 (see FIG. 4) on the side surface of the second jig receiving portion 2144. (See FIG. 6) by inserting a projection provided on the side surface of the adjusting arm. The attitude of the rod integrator 300 can be adjusted by moving the first adjustment arms AM1 and AM2 and the second adjustment arms AM3 and AM4. FIG. 12 is an explanatory diagram showing an adjustable posture of the rod integrator 300.
[0075]
As shown in FIG. 12A, by lowering one of the first adjusting arms AM1 and AM2 in the downward direction and raising the other in response to the downward, the supporting portion 2210 of the rod integrator 300 is moved downward. The rotation about the z-axis, which is substantially at the center, can be adjusted. This makes it possible to adjust the inclination of the illumination area that illuminates the reflection type light modulation device 700 with respect to the light modulation area.
[0076]
As shown in FIG. 12 (B), the supporting portion 2210 is substantially changed by uniformly changing the second adjusting arms AM3 and AM4 in the y direction (vertical direction) or the x direction (horizontal direction). The rotation around the x-axis (movement in the vertical direction) or the rotation around the y-axis (movement in the left-right direction) of the emission-side end of the holder 2100 as the center, that is, the light emission surface 304 of the rod integrator 300 is adjusted. can do. This makes it possible to adjust the inclination in the x direction and the inclination in the y direction of the central axis 300ax of the rod integrator 300 with respect to the system optical axis 1000ax. Thereby, it is possible to adjust the center axis 300ax of the rod integrator 300 to coincide with the system optical axis 1000ax.
[0077]
Further, as shown in FIG. 12C, the second adjusting arms AM3 and AM4 are uniformly changed in the z-direction (front-back direction) to uniformly change the light incident surface 302 of the rod integrator 300 and the light. The position of the exit surface 304 in the z direction (direction along the system optical axis 1000ax) can be adjusted. However, this adjustment range is limited to a range in which the bonding surface 2132 of the bonding and fixing portion 2130 can be changed within the groove (see FIG. 7) of the bonding groove portion 2230.
[0078]
Note that these adjustments are usually a) adjustment of rotation around the z axis, b) rotation around the y axis (movement in the left and right direction), c) rotation around the x axis (movement in the up and down direction), and d) z It is executed in the order of the axial movement. However, the order of adjustment is not limited to this, and is arbitrary.
[0079]
B4. Effects of rod integrator holding mechanism:
As described above, by applying the holding mechanism 2000 of the present embodiment, the position of the light exit surface 304 in the x, y, and z directions can be adjusted while realizing the position adjustment of the light incident surface of the rod integrator 300. It is possible to adjust. Further, by adjusting the rotation of the rod integrator 300 about the z axis (system optical axis 1000ax), the inclination of the illumination area with respect to the light modulation area of the reflection type light modulation device 700 can be adjusted. Further, when an illumination optical system is configured using the rod integrator 300 mounted on the holding mechanism 2000, light emitted from the light source device can be more efficiently used as illumination light, and emitted from the illumination optical system. It is possible to efficiently irradiate the illumination light to a predetermined area. Further, if a projector is configured by applying an illumination optical system using the rod integrator 300 mounted on the holding mechanism 2000, it is possible to increase the brightness of a brighter projected image.
[0080]
C. Second embodiment:
FIG. 13 is a perspective view showing an overview of a support 2200A applied to the holding mechanism according to the second embodiment. FIG. 13A is a perspective view of the right side when the light incident surface 302 of the rod integrator 300 is the front, and FIG. 13B is a perspective view of the left side.
[0081]
Similarly to the support 2200 of the first embodiment, this support 2200A also has a support 2220A having a support portion 2210 on the top, an adhesive groove 2230A provided on a side surface of the support 2220A in the x direction, and a support 2220A. And a pedestal 2240A for attaching the bonding groove 2230A to the attachment position of the attachment guide GD. The pedestal portion 2240A is provided with a pin hole 2242B for positioning to the mounting guide GD and four screw holes 2242A for fixing on both sides in the z direction with the support base 2220A interposed therebetween. The support 2200A is fixed to the mounting guide GD via four screw holes 2242A by mounting screws. In the figure, the mounting screws are omitted.
[0082]
Since the four screw holes 2242A and the pin holes 2242B for positioning are long holes in the z direction, the position of the support 2200A can be shifted in the z direction.
[0083]
As shown in FIG. 13B, the position of the support 2200A in the z direction is moved by moving the protrusion 2250 provided on the left side surface of the support base 2220A in the z direction with an adjustment jig (not shown). be able to. Thereby, the position in the z direction of the entire holding mechanism including the support 2200A can be adjusted. Thereby, the position of the mounted rod integrator 300 in the z direction can be adjusted.
[0084]
As described above, the range of movement of the holding mechanism 2000 in the z direction in the first embodiment is limited by the size of the groove of the bonding groove 2230 that forms the fixing portion 2300. However, in the present embodiment, adjustment in the z direction is possible within a range corresponding to the length of the screw hole 2242A in the z direction. Therefore, the second embodiment has a greater degree of freedom in adjustment in the z-direction than the first embodiment.
[0085]
In addition, as shown in FIG. 13A, the protrusion 2260 provided on the right side surface of the support base 2220A forms a stopper with the protrusion GP provided on the mounting guide GD. Thus, the range of movement of the support 2200 in the z direction can be positively limited. Note that this stopper shows a case where the movement in the -z direction is restricted. Thereby, for example, in the projector of FIG. 1, it is possible to prevent the rod integrator 300 from contacting the color wheel 200 arranged near the light incident surface 302. Note that the protrusion GP on the side of the mounting guide GD can be provided on the + z direction side of the protrusion 2260 of the support base 2220A to limit the movement on the + z direction side. This case is effective, for example, in a configuration in which a color wheel is arranged near the light exit surface 304 of the rod integrator 300. Further, two projections GP may be provided on the mounting guide GD so as to sandwich the projection 2260. This stopper is not always necessary.
[0086]
D. Modification:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist of the present invention, and for example, the following modifications are possible.
[0087]
In the above embodiment, the projector using the DMD as the reflection type light modulation device is described as an example of the light modulation device, but the invention is not limited to this. For example, the present invention can be applied to a projector using another reflective light modulation device such as a grating light valve (GLV: Grating Light Valve) or a reflective liquid crystal panel. In addition, a transmissive light modulator that can be applied to a projector using a transmissive light modulator instead of a reflective light modulator includes, for example, a transmissive liquid crystal panel. Further, the present invention can be applied to an optical device other than the projector. That is, any optical device to which the rod integrator is applied can be applied to various devices.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration of a projector to which a rod integrator holding mechanism of the present invention is applied.
FIG. 2 is an enlarged perspective view schematically showing a rod integrator 300.
FIG. 3 is a perspective view showing an overview of an integrator holding mechanism 2000.
FIG. 4 is an exploded perspective view showing an integrator holding mechanism 2000 in an exploded state.
FIG. 5 is a perspective view showing an overview of a holder 2100.
FIG. 6 is a perspective view showing an overview of a support 2200.
FIG. 7 is an explanatory diagram showing a fixed portion 2400 in an enlarged manner.
FIG. 8 is an explanatory diagram showing a method of mounting the rod integrator 300 on the holder 2100.
FIG. 9 is an explanatory diagram illustrating a method of mounting the holder 2100 on the holder mounting surface 3110.
FIG. 10 is an explanatory diagram illustrating a method of mounting a rod integrator 300 on a rod mounting surface 3220.
FIG. 11 is an enlarged perspective view showing the holding mechanism 2000 when the position adjustment of the rod integrator 300 is performed.
FIG. 12 is an explanatory diagram showing an adjustable posture of a rod integrator 300.
FIG. 13 is a perspective view showing an overview of a support 2200A applied to a holding mechanism as a second embodiment.
[Explanation of symbols]
1000 ... Projector
1000ax ... System optical axis
100 light source device
110 ... elliptical reflector
120 ... Light source lamp
200 ... Color wheel
210ax ... rotary axis
300… Rod integrator
300ax: Central axis of rod integrator (optical axis)
302: Light incident surface
304 ... light exit surface
400 relay optical system
500 ... Reflection mirror
600 ... Field lens
700 ... Reflection type light modulator
700ax ... Center axis
800: Projection lens
2000… Integrator holding mechanism
2100 ... Holder
2110 ... Support receiving groove
2120 ... Holding part
2122 ... Holding surface
2128 ... Back side
2124, 2126 ... hole
2129: Incident side surface
2130 ... Adhesive fixing part
2132 ... adhesive surface
2140 Adjustment jig receiving part
2142: First jig receiving portion
2144: Second jig receiving portion
2146 ... Hanging hole
2200 ... Support
2210 ... Support part
2220 ... Support
2230: adhesive groove
2232 ... Side wall surface
2240 ... Base
2242-1: Screw hole
2242-2 ... Pin hole
2248: Incident side surface
2300 engaging part
2400 ... fixed part
3000 ... Mounting jig
3100 ... side wall
3110: Holder mounting surface
3112, 3114 ... Projection
3200 ... side wall
3220 ... Rod mounting surface
3222, 3224 ... Projection
3226 ... Projection
3300… Guide
300ax ... optical axis
2200A ... Support
2220A ... Support
2230A ... adhesive groove
2240A ... pedestal part
2242A: Screw hole
2242B: Pin hole
2250 ... Projection
2260 ... Projection
AM1, AM2: First adjustment arm
AM3, AM4: Second adjustment arm
GD: Installation guide
GP ... projection

Claims (9)

A rod integrator holding mechanism,
A holding body for holding the rod integrator,
A support for supporting the holder,
With
The holder is
A holding unit for holding the rod integrator,
After adjusting the posture of the holding body, an adhesive fixing portion for fixing the posture of the holding body,
With
The support is
A contact portion that contacts the holding member and, when adjusting the posture of the holding member, is rotatable around three axes orthogonal to each other with the contact portion substantially as a center;
The adhesive fixing portion is inserted, after adjusting the posture of the holding body, after fixing the adhesive fixing portion by bonding, an adhesive groove portion to fix the posture of the holding body,
A holding mechanism comprising: The holding mechanism according to claim 1, wherein
The adhesive fixing portion has an adhesive surface perpendicular to a center axis of the rod integrator held by the holding portion,
The holding mechanism, wherein the bonding groove has a shape that allows the bonding and fixing portion to rotate in accordance with the rotation of the holding body about a contact portion of the support portion. The holding mechanism according to claim 1 or 2,
The holding mechanism, wherein the supporting portion contacts the holding member at an end of the holding portion on a side where the light incident surface of the rod integrator is arranged. The holding mechanism according to any one of claims 1 to 3, wherein
A holding mechanism, wherein the supporting portion has a tip portion formed of a substantially hemispherical projection. The holding mechanism according to claim 5, wherein
The holding mechanism, wherein the holding body has, at a contact portion of the support portion, a concave portion having a shape corresponding to a tip shape of the projection. The holding mechanism according to claim 5, wherein
The holding mechanism, wherein the recess has a substantially semi-cylindrical shape elongated in a direction along a central axis of the rod integrator held by the holding portion. The holding mechanism according to any one of claims 1 to 5, wherein
The holding mechanism, wherein the support has a long mounting screw hole along a predetermined direction. A light source device for emitting condensed light, a rod integrator for equalizing the illuminance of the condensed light emitted from the light source device, and an image of light on a light exit surface of the integrator rod formed in a predetermined area And a relay optical system for illuminating the predetermined area, and an adjustment mechanism for an illumination optical system including:
An adjustment mechanism for an illumination optical system, comprising: the rod integrator holding mechanism according to claim 1. A projector for projecting an image,
A light source device for emitting condensed light,
A rod integrator for equalizing the illuminance of the condensed light emitted from the light source device,
A light modulator that emits light incident from a light incident surface as image light representing an image according to a given image signal,
An image of light on the light exit surface of the integrator rod is formed in a region including at least the light incident surface of the light modulator, and light emitted from the integrator rod is incident on the light incident surface of the light modulator. Relay optics for
A projection optical system that projects an image represented by image light emitted from the light modulation device,
A projection display device, further comprising a rod integrator holding mechanism according to any one of claims 1 to 8.

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