JP2020134851A - Adjustment mechanism and projector - Google Patents

Abstract

To provide an adjustment mechanism for adjusting a position of a display panel and a projector.SOLUTION: A blue color adjustment mechanism 70 on which a blue color display panel 40B is mounted is an adjustment mechanism for adjusting a position of the blue color display panel 40B and comprises a first stage 100, a second stage 200 and a third stage 300. The first stage 100 includes a first plate 101 on which the blue color display panel 40B is mounted, and a first actuator 110. The second stage 200 includes a second plate 201 on which the first plate 101 is mounted, and a second actuator 210. The third stage 300 includes a third plate 301 on which the second plate 201 is mounted, and a third actuator 310.SELECTED DRAWING: Figure 4

Description

The present invention relates to an adjustment mechanism and a projector.

Conventionally, in the optical system of a projector, a method of adjusting the position of a liquid crystal panel has been known. For example, Patent Document 1 proposes a focus adjustment method for a liquid crystal projector.

Japanese Unexamined Patent Publication No. 2003-98599

However, in the focus adjustment method described in Patent Document 1, there is a problem that although the focus adjustment algorithm is disclosed, the specific adjustment mechanism is not disclosed. That is, there has been a demand for an adjustment mechanism for adjusting the position of a display panel such as a liquid crystal panel.

The adjustment mechanism of the present application is an adjustment mechanism on which a display panel is mounted and adjusts the position of the display panel, and is a first stage in which the display panel is mounted on a mounting portion and a second stage that supports the first stage. And a third stage that supports the second stage, and when the surface parallel to the display surface of the display panel is used as the reference surface in the state of being mounted on the mounting portion of the display panel, the reference surface is used. The orthogonal coordinate axes are the Z axis, the coordinate axes orthogonal to each other in the reference plane are the X axis and the Y axis, the rotation direction around the X axis is the θx direction, the rotation direction around the Y axis is the θy direction, and the Z axis is around. When the rotation direction is the θz direction, the first stage includes a first plate on which the display panel is placed, a first actuator that moves the first plate along the Z axis, a θx direction, and a θy direction. The second stage has a second plate on which the first plate is placed, and a second actuator that moves the second plate in the direction along the X axis and the θz direction, and has a third stage. Is characterized by having a third plate on which the second plate is placed and a third actuator that moves the third plate in a direction along the Y axis.

The projector of the present application includes a light source, a display panel that modulates the light emitted from the light source, a projection lens that projects the light modulated by the display panel, and the above-mentioned adjustment mechanism on which the display panel is mounted. The feature is that the position of the display panel with respect to the projection lens is changed by moving the first plate in the directions along the Z axis, the θx direction, and the θy direction, and the focus of the projection lens with respect to the display panel is adjusted. And.

As display panels, the above projector includes a green display panel that modulates green light, a red display panel that modulates red light, and a blue display panel that modulates blue light among the light emitted from a light source. As the adjustment mechanism, a red adjustment mechanism for adjusting the position of the red display panel and a blue adjustment mechanism for adjusting the position of the blue display panel are provided, and the second plate and the third plate in the red adjustment mechanism are provided. By moving, the position of the red display panel changes, and by moving the second and third plates in the blue adjustment mechanism, the position of the blue display panel changes, and the position of the blue display panel changes with respect to the green display panel. It is preferable that the display panel and the blue display panel are positioned.

The above projector includes a color synthesis optical system that synthesizes the light emitted from each of the red display panel, the green display panel, and the blue display panel, and is the first stage, the second stage, and the third stage. It is preferable that the three stages are located on the side closest to the color synthesis optical system and the first stage is located on the side farthest from the color synthesis optical system.

The schematic diagram which shows the structure of the projector which concerns on embodiment. A perspective view showing an arrangement of a cross dichroic prism and a display panel or the like. The perspective view which shows the appearance of the adjustment mechanism. An exploded perspective view showing the configuration of the adjustment mechanism. The perspective view which shows the structure of the 1st plate. The perspective view which shows the structure of the 2nd plate. The perspective view which shows the structure of the 3rd plate. The perspective view which shows the structure of the base. Schematic cross-sectional view showing the configuration of an actuator. The schematic diagram which shows the uniaxial adjustment method of Z. The schematic diagram which shows the uniaxial adjustment method of θx. The schematic diagram which shows the uniaxial adjustment method of θy. A perspective view showing a third plate and a second plate mounted on the third plate. A perspective view showing a third plate and a second plate mounted on the third plate. The schematic plan view which shows the uniaxial adjustment method of X. The schematic plan view which shows the uniaxial adjustment method of θz. A perspective view showing a base and a third plate mounted on the base. The schematic plan view which shows the uniaxial adjustment method of Y.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below describe an example of the present invention. The present invention is not limited to the following embodiments, and various modifications made within the scope of not changing the gist of the present invention are also included in the present invention. Here, in each of the following figures, the scale of each member is different from the actual one in order to make each member recognizable in size. Further, in each of the following figures, XYZ axes, which are coordinate axes orthogonal to each other, are attached as necessary.

1. 1. Embodiment In the present embodiment, an adjustment mechanism provided in a projector provided with three liquid crystal panels as display panels will be described as an example.

1.1. Projector The configuration of the projector according to this embodiment will be described with reference to FIG. FIG. 1 is a schematic view showing a configuration of a projector according to an embodiment.

As shown in FIG. 1, the projector 1 according to the present embodiment is green as three display panels, which are a light source device 10 which is an illumination optical system, a color separation optical system 20, a relay optical system 30, and an optical modulation device. Display panel 40G, display panel 40R for red, display panel 40B for blue, adjustment mechanism 70 for blue and adjustment mechanism 80 for red, cross dichroic prism 50 as a prism which is a color synthesis optical system, and projection lens 60 are provided. Is stored in the main body 2. In the following description, the green display panel 40G, the red display panel 40R, and the blue display panel 40B may be collectively referred to as the display panel 40. Further, the blue adjustment mechanism 70 on which the blue display panel 40B is mounted and the red adjustment mechanism 80 on which the red display panel 40R is mounted are collectively referred to as the adjustment mechanism 7.

The display panel 40 modulates the light emitted from the light source 11 included in the light source device 10. Of the display panels 40, the red display panel 40R is mounted on the red adjusting mechanism 80 to adjust the position, and the blue display panel 40B is mounted on the blue adjusting mechanism 70 to adjust the position. The green display panel 40G is not mounted on the adjusting mechanism of the present embodiment, but is mounted on the mounting member 90. The green display panel 40G modulates the green light G, the red display panel 40R modulates the red light R, and the blue display panel 40B modulates the blue light B. The light modulated by the display panel 40 is synthesized by the cross dichroic prism 50 and projected from the projection lens 60 onto a projection target such as a screen (not shown).

The light source device 10 includes a light source 11, a first lens array 12, a second lens array 13, a polarization conversion element 14, and a superposed lens 15. In the first lens array 12 and the second lens array 13, the small lenses are arranged in a matrix.

In the projector 1, a discharge type light source is adopted as the light source 11, but the method of the light source 11 is not limited to this. As the light source 11, a solid-state light source such as a light emitting diode or a laser may be adopted.

The light emitted from the light source 11 is divided into a plurality of minute partial luminous fluxes by the first lens array 12. The polarization conversion element 14 aligns the unpolarized light emitted from the light source 11 with the polarization available on the display panel 40. Each partial luminous flux is superimposed on each incident surface of the three display panels 40 to be illuminated by the second lens array 13 and the superimposed lens 15. That is, the first lens array 12, the second lens array 13, and the superimposing lens 15 form an integrator illumination optical system in which the light emitted from the light source 11 illuminates the display panel 40.

The color separation optical system 20 includes a first dichroic mirror 21, a second dichroic mirror 22, a reflection mirror 23, and field lenses 24 and 25. The color separation optical system 20 separates the light from the light source device 10 into three color lights having different wavelength ranges. Here, the three colored lights are the above-mentioned green light G, red light R, and blue light B. The green light G is a substantially green light, the red light R is a substantially red light, and the blue light B is a substantially blue light.

The field lens 24 is arranged on the incident surface side of the red display panel 40R. The field lens 25 is arranged on the incident surface side of the green display panel 40G.

The first dichroic mirror 21 transmits the red light R and reflects the green light G and the blue light B. The red light R transmitted through the first dichroic mirror 21 is reflected by the reflection mirror 23, passes through the field lens 24, and illuminates the red display panel 40R.

The field lens 24 collects the red light R reflected by the reflection mirror 23 and illuminates the red display panel 40R. Like the field lens 24, the field lens 25 also collects the green light G reflected by the second dichroic mirror 22 and illuminates the green display panel 40G. At this time, the light illuminating the green display panel 40G and the red display panel 40R is set so as to have substantially parallel luminous fluxes.

The second dichroic mirror 22 transmits blue light B and reflects green light G. The green light G reflected by the first dichroic mirror 21 is reflected by the second dichroic mirror 22 and then passes through the field lens 25 to illuminate the green display panel 40G.

Here, the first dichroic mirror 21 and the second dichroic mirror 22 are manufactured by forming a dielectric multilayer film corresponding to each function on a transparent glass plate.

The relay optical system 30 includes an incident side lens 31, a first reflection mirror 32, a relay lens 33, a second reflection mirror 34, and an emission side lens 35 as a field lens. Since the blue light B has a longer optical path than the green light G and the red light R, the luminous flux tends to be large. Therefore, the relay lens 33 is used to suppress the expansion of the luminous flux. The blue light B emitted from the color separation optical system 20 is reflected by the first reflection mirror 32 and converged in the vicinity of the relay lens 33 by the incident side lens 31. Then, the blue light B diverges toward the second reflection mirror 34 and the ejection side lens 35.

The ejection side lens 35 has the same function as the field lenses 24 and 25 described above, and illuminates the blue display panel 40B. The light that illuminates the blue display panel 40B is set so as to have a substantially parallel luminous flux.

The display panel 40 functions as an optical modulation device in the projector 1. A transmissive liquid crystal panel is used for the display panel 40. In this case, in addition to the liquid crystal panel as the display panel 40, an incident side polarizing plate and an outgoing side polarizing plate are usually provided. Although the polarizing plate on the incident side is not shown, it may be fixed to the light incident side of the liquid crystal panel. Further, the polarizing plate 405 shown in FIG. 8 corresponds to the polarizing plate on the exit side.

Here, the display panel 40 as the optical modulation device is not limited to the transmissive liquid crystal panel. As the light modulation device, a reflection type light modulation device such as a reflection type liquid crystal panel may be adopted. Further, a digital micromirror device (DMD) or the like that modulates the light emitted from the light source 11 by controlling the emission direction of the incident light for each micromirror as a pixel may be adopted. In the digital micromirror device, the surface on which the micromirrors are arranged in a matrix corresponds to the display surface. Further, the configuration is not limited to the configuration in which each of the plurality of colored lights is provided with an optical modulation device, and a configuration in which a plurality of colored lights are modulated by time division by one optical modulation device may be used. The adjustment mechanism 7 of the present embodiment is more effective in adjusting the positions of the plurality of display panels 40.

As described above, of the display panels 40, the blue display panel 40B is mounted on the blue adjustment mechanism 70, and the red display panel 40R is mounted on the red adjustment mechanism 80. The adjusting mechanism 7, that is, the blue adjusting mechanism 70 and the red adjusting mechanism 80 will be described later.

The cross dichroic prism 50 synthesizes the conversion light of each color emitted from the display panel 40. Specifically, the cross dichroic prism 50 synthesizes the light emitted from each of the red display panel 40R, the green display panel 40G, and the blue display panel 40B. The cross dichroic prism 50 has a red light reflecting dichroic surface 51R that reflects red light R and a blue light reflecting dichroic surface 51B that reflects blue light B. A dielectric multilayer film that reflects red light R is arranged on the red light reflecting dichroic surface 51R. A dielectric multilayer film that reflects blue light B is arranged on the blue light reflecting dichroic surface 51B. The red light-reflecting dichroic surface 51R and the blue light-reflecting dichroic surface 51B are hereinafter simply referred to as the reflective dichroic surfaces 51R and 51B.

Here, when the arrangement of the color separation optical system 20, the relay optical system 30, and the cross dichroic prism 50 is viewed in a plan view, a dielectric multilayer film that reflects red light R and a dielectric multilayer film that reflects blue light B Are arranged in a substantially X shape. The reflective dichroic surfaces 51R and 51B combine the converted light of three colors, red light R, green light G, and blue light B, to generate synthetic light for displaying a color image. The synthetic light thus generated by the cross dichroic prism 50 is emitted toward the projection lens 60.

The projection lens 60 is attached to the main body 2. The synthetic light emitted from the main body 2 through the projection lens 60 is projected as image light onto a projection target such as a screen (not shown).

1.2. Adjustment Mechanism Next, the configuration of the adjustment mechanism according to the present embodiment will be described with reference to FIGS. 2, 3 and 4. FIG. 2 is a perspective view showing the arrangement of the cross dichroic prism and the display panel and the like. FIG. 3 is a perspective view showing the appearance of the adjusting mechanism. FIG. 4 is an exploded perspective view showing the configuration of the adjustment mechanism. In FIG. 2, the distance between the cross dichroic prism 50 and the three display panels 40 is shown farther than it actually is in order to make it easier to understand the arrangement of each configuration. Further, in FIG. 2, the arrangement of the blue display panel 40B and the red display panel 40R is shown upside down with respect to the cross dichroic prism 50. Further, FIGS. 3 and 4 show the blue adjusting mechanism 70 in the state where the blue display panel 40B is mounted among the adjusting mechanisms 7.

As shown in FIG. 2, a green display panel 40G, a blue display panel 40B, and a red display panel 40R are arranged on three sides of the cross dichroic prism 50. The blue display panel 40B is mounted on the blue adjusting mechanism 70, and the red display panel 40R is mounted on the red adjusting mechanism 80. The green display panel 40G is mounted on the mounting member 90. The blue adjustment mechanism 70 is located between the blue display panel 40B and the cross dichroic prism 50. The red adjustment mechanism 80 is located between the red display panel 40R and the cross dichroic prism 50. The mounting member 90 is located between the green display panel 40G and the cross dichroic prism 50.

In the adjusting mechanism 7 and the mounting member 90, no light-shielding member is interposed between the mounted display panel 40 and the cross dichroic prism 50. Therefore, the light modulated by each display panel 40 is incident on the cross dichroic prism 50 without being blocked by the adjusting mechanism 7 and the mounting member 90. This form can be seen in FIG. 2 by the red adjustment mechanism 80 in which the back surface of the surface on which the red display panel 40R is placed is illustrated.

Here, when the green display panel 40G is the first display panel and the blue display panel 40B or the red display panel 40R is the second display panel among the display panels 40, the second display panel is the corresponding book. It is mounted on the adjusting mechanism 7 of the embodiment. The adjustment mechanism 7 adjusts the position of the second display panel with respect to the first display panel.

The red adjustment mechanism 80 on which the red display panel 40R is mounted has the same configuration as the blue adjustment mechanism 70. Therefore, the adjustment mechanism 7 of the present embodiment will be described below with the blue adjustment mechanism 70 as a representative example, and the description of the red adjustment mechanism 80 will be omitted.

In the present embodiment, the green display panel 40G is not mounted on the adjustment mechanism of the present invention, but the present invention is not limited to this. The green display panel 40G may be mounted on the adjusting mechanism of the present invention in place of the mounting member 90. Further, the mounting member 90 on which the green display panel 40G is mounted may include a focus adjusting mechanism for adjusting the distance between the green display panel 40G and the projection lens 60 shown in FIG.

As shown in FIG. 3, the blue adjustment mechanism 70 includes a first stage 100, a second stage 200, a third stage 300, and a base 400. Here, in a state where the blue display panel 40B is mounted on a mounting portion described later, when a plane parallel to the display plane of the blue display panel 40B is used as a reference plane, the coordinate axes orthogonal to the reference plane are Z. The axes are the axes, the coordinate axes that are orthogonal to each other in the reference plane are the X-axis and the Y-axis, the rotation direction around the X-axis is the θx direction, the rotation direction around the Y-axis is the θy direction, and the rotation direction around the Z-axis is the θz direction. And. Further, a + or-symbol as shown in the figure is added to each direction along the X-axis, Y-axis, and Z-axis, and the + direction is the positive direction and the-direction is the negative direction. .. In the following description, the respective directions along the X-axis, Y-axis, and Z-axis are also simply referred to as X-direction, Y-direction, and Z-direction.

The blue adjustment mechanism 70 has an elongated rectangular shape along the Y axis in a plan view from the positive Z direction. The blue adjustment mechanism 70 is fixed to the base 400 side, in other words, the negative Z direction side, to the cross dichroic prism 50 shown in FIG.

The blue display panel 40B is mounted in the blue adjustment mechanism 70 from the center of the Y direction, which is the longitudinal direction, toward the positive Y direction in the above plan view. The blue display panel 40B has a rectangular shape, and of the four sides forming the rectangle, two sides are arranged along the Y axis and the other two sides are arranged along the X axis.

As shown in FIG. 4, the blue adjustment mechanism 70 includes a first stage 100 in which the blue display panel 40B is mounted on a mounting portion described later, a second stage 200 that supports the first stage 100, and a second stage. It includes a third stage 300 that supports the second stage 200, and a base 400 that supports the third stage 300. The first stage 100, the second stage 200, the third stage 300, and the base 400 are superimposed in this order in the negative Z direction. Therefore, of the first stage 100, the second stage 200, and the third stage 300, the third stage 300 is located on the side closest to the cross dichroic prism 50 described above, and the first stage 100 is the farthest from the cross dichroic prism 50. Located on the side.

The first stage 100 has a first plate 101 on which the blue display panel 40B is placed, and a first actuator 110. The first actuator 110 has three actuators 111, 112, 113. The first actuator 110 comes into contact with the first plate 101 and moves the first plate 101 in the positive and negative Z directions, the θx direction, and the θy direction.

The second stage 200 has a substantially flat second plate 201 on which the first plate 101 is placed, and a second actuator 210. The second actuator 210 has actuators 211 and 212. The second actuator 210 moves the second plate 201 in the positive and negative X directions and the θz directions. In this specification, changes in posture such as rotation in the θx direction, the θy direction, and the θz direction are also described as being included in the movement.

The third stage 300 has a substantially flat third plate 301 on which the second plate 201 is placed, and a third actuator 310. The third actuator 310 moves the third plate 301 in the positive and negative Y directions.

A third plate 301 is placed on the base 400. The negative Z direction side of the base 400 is fixed to the cross dichroic prism 50 shown in FIG.

The actuators 111, 112, 113 as the first actuator 110 are mounted on the second plate 201 and come into contact with the first plate 101. The actuators 211 and 212 as the second actuator 210 are mounted on the surface of the third plate 301 on the negative Z direction side. The third actuator 310 is mounted on the base 400. Details of the first actuator 110, the second actuator 210, and the third actuator 310 will be described later.

Next, the detailed configuration of each of the first stage 100, the second stage 200, the third stage 300, and the base 400 will be described with reference to FIGS. 5, 6, 7, and 8. FIG. 5 is a perspective view showing the configuration of the first plate. FIG. 6 is a perspective view showing the configuration of the second plate. FIG. 7 is a perspective view showing the configuration of the third plate. FIG. 8 is a perspective view showing the configuration of the base.

Here, for convenience of illustration, FIG. 6 shows a state in which the actuators 111, 112, and 113 are mounted on the second plate 201. FIG. 7 shows a state in which the actuators 211 and 212 are mounted on the third plate 301. FIG. 8 shows a state in which the third actuator 310 is mounted on the base 400.

As shown in FIG. 5, the first plate 101 has a substantially rectangular shape, and the long side is arranged along the Y axis and the short side is arranged along the X axis. The first plate 101 has a mounting portion 71, a spring member 76, and a pair of spring members 77. A blue display panel 40B is mounted on the mounting portion 71.

The spring member 76 and the pair of spring members 77 are metal coil springs. One end of the spring member 76 is fixed to the negative Z direction side of the positive Y direction end of the first plate 101. The pair of spring members 77 are arranged side by side along the positive and negative X directions. The pair of spring members 77 are located on the negative Y direction side of the spring member 76 with the mounting portion 71 sandwiched therein, and one ends thereof are fixed to the negative Z direction side of the first plate 101.

The other ends of the spring member 76 and the pair of spring members 77 are fixed to the negative Z-direction surface of the base 400 via the openings of the second plate 201, the third plate 301, and the base 400, which will be described later. To. Therefore, the first plate 101 and the base 400 are connected by the spring member 76 and the pair of spring members 77, and the second plate 201 and the third plate 301 are sandwiched between them. At this time, the tensile load of the spring member 76 and the pair of spring members 77 is set so that the first plate 101, the second plate 201, and the third plate 301 can move with respect to the base 400.

As shown in FIG. 6, the second plate 201 has a substantially rectangular shape, and the long side is arranged along the Y axis and the short side is arranged along the X axis. The second plate 201 has a first elastic member 231 and a connecting portion 241, openings 276, 281 and a pair of openings 277. The first elastic member 231 connects the second plate 201 and the third plate 301. Further, the actuators 111, 112, 113 as the first actuator 110 are arranged so as to penetrate the second plate 201 in the positive and negative Z directions.

The first elastic member 231 is a single plate leaf spring whose longitudinal direction is along the Y axis, and is arranged along the Z axis in the width direction and along the X axis in the plate thickness direction. The length of the first elastic member 231 in the longitudinal direction is shorter than the long side of the second plate 201 and longer than the short side. With the above arrangement, the first elastic member 231 can be elastically deformed in the positive and negative X directions. The first elastic member 231 is connected to and fixed to the second plate 201 via a connecting portion 241 at a substantially center in the longitudinal direction. Both ends of the first elastic member 231 in the longitudinal direction are connected to the third plate 301 via a contact portion described later of the third plate 301. As a result, the first elastic member 231 connects the second plate 201 and the third plate 301.

At this time, the first elastic member 231 is arranged near the long side of the second plate 201 on the positive X direction side. Further, the first plate 101 is overlapped with the second plate 201 while avoiding the first elastic member 231. As described above, the first elastic member 231 is arranged in the minimum installation space.

In the present embodiment, a single leaf spring, a so-called thin leaf spring, is used as the first elastic member 231, but the present invention is not limited to this. As the first elastic member 231, if the second plate 201 and the third plate 301 are connected and elastic deformation is possible in the positive and negative X directions, other leaf springs such as laminated leaf springs, coil springs, and disc springs. Other elastic members such as springs and rubber materials may be used. Among these elastic members, it is preferable to use a leaf spring from the viewpoint that the space required for installation is relatively small.

The opening 281 is a substantially rectangular window penetrating the second plate 201. The opening 281 is provided at a position where it overlaps with the blue display panel 40B mounted on the mounting portion 71 of the first plate 101 in a plan view from the positive Z direction. Therefore, the light modulated by the blue display panel 40B is emitted without being blocked by the second plate 201.

Of the first actuators 110, the actuator 111 as the first actuator is a positive Y on one side of the opening 281, in other words, the mounting portion 71, in a plan view from the positive Z direction. It is located on the directional side. Of the first actuator 110, the actuator 112 as the second actuator and the actuator 113 as the third actuator are negative in the plan view from the positive Z direction and are on the other side with respect to the mounting portion 71. It is arranged on the Y direction side. In other words, the actuators 112 and 113 are located on the opposite side of the mounting portion 71 from the actuator 111. Further, the actuators 112 and 113 are arranged side by side along the positive and negative X directions. That is, the actuator 111 and the actuators 112 and 113 are arranged so as to face each other in the positive and negative Y directions with the mounting portion 71 sandwiched in a plan view from the positive Z direction.

The opening 276 and the pair of openings 277 are openings that penetrate the second plate 201, and are formed larger than the coil outer shape of the spring member 76 and the pair of spring members 77. In a plan view from the positive Z direction, the opening 276 is provided at a position corresponding to the spring member 76, and the pair of openings 277 are provided at a position corresponding to the pair of spring members 77. As a result, when the blue adjustment mechanism 70 is assembled, the spring member 76 and the pair of spring members 77 are arranged through the opening 276 and the pair of openings 277.

As shown in FIG. 7, the third plate 301 has a substantially rectangular shape, and the long side is arranged along the Y axis and the short side is arranged along the X axis. The third plate 301 has a second elastic member 332 and a third elastic member 333, a pair of contact portions 351 and 352, openings 381 and 391, and a pair of openings 377 and 392. Further, the actuators 211 and 212 as the second actuator 210 are arranged on the negative Z direction side of the third plate 301.

The abutting portions 351 and 352 are rib-shaped protrusions protruding in the positive Z direction from the substantially flat third plate 301. The contact portions 351 and 352 are provided at both ends of the third plate 301 in the longitudinal direction, which is the positive and negative Y directions. Specifically, the contact portion 351 is provided on the positive Y direction side, and the contact portion 352 is provided on the negative Y direction side.

The contact portions 351 and 352 form a pair, and both ends of the first elastic member 231 are connected to each other. As a result, the first elastic member 231 is connected to the third plate 301 via the pair of abutting portions 351 and 352. Further, the first elastic member 231 is connected to the second plate 201 via a connecting portion 241 located between a pair of abutting portions 351 and 352 in the positive and negative Y directions.

The second elastic member 332 and the third elastic member 333 are single plate leaf springs whose longitudinal direction is along the X axis, and are arranged along the Z axis in the width direction and along the Y axis in the plate thickness direction. The second elastic member 332 and the third elastic member 333 have substantially the same shape, and the length in the longitudinal direction is shorter than the short side of the third plate 301. With the above arrangement, the second elastic member 332 and the third elastic member 333 are elastically deformed in the positive and negative Y directions.

The second elastic member 332 is arranged near the short side of the third plate 301 on the positive Y direction side. One end of the second elastic member 332 is connected to the contact portion 351 and the other end is connected to the connection portion described later of the base 400. The third elastic member 333 is arranged near the short side on the negative Y direction side of the third plate 301. One end of the third elastic member 333 is connected to the contact portion 352, and the other end is connected to the connection portion described later of the base 400. The second elastic member 332 and the third elastic member 333 are provided so as to face each other in the positive and negative Y directions and substantially parallel to each other. The second elastic member 332 and the third elastic member 333 connect the third plate 301 and the base 400, and restrict the movement of the third plate 301 with respect to the base 400 in the positive and negative Y directions.

When the blue adjusting mechanism 70 is assembled, the second plate 201 is overlapped with the third plate 301, avoiding the second elastic member 332 and the third elastic member 333. Therefore, the second elastic member 332 and the third elastic member 333 are arranged in the minimum installation space.

In the present embodiment, a single leaf spring, a so-called thin leaf spring, is used as the second elastic member 332 and the third elastic member 333, but the present invention is not limited to this. As the second elastic member 332 and the third elastic member 333, the same elastic member as the first elastic member 231 described above may be used. Among the elastic members described above, it is preferable to use a leaf spring from the viewpoint that the space required for installation is relatively small.

The opening 381 is a substantially rectangular window penetrating the third plate 301. The opening 381 is provided at a position where it overlaps with the blue display panel 40B mounted on the mounting portion 71 of the first plate 101 in a plan view from the positive Z direction. Therefore, the light modulated by the blue display panel 40B is emitted without being blocked by the third plate 301.

The opening 391 and the pair of openings 377 and 392 are openings that penetrate the third plate 301. The opening 391 is provided at a position corresponding to the actuator 111 and the spring member 76 in a plan view from the positive Z direction. The opening 391 is formed to be larger than the shape of the actuator 111 having a cross section parallel to the XY plane and the coil outer shape of the spring member 76. Therefore, when the blue adjustment mechanism 70 is assembled, the opening 391 serves as a relief for the actuator 111 and allows the spring member 76 to pass through.

The pair of openings 377 are provided at positions corresponding to the pair of spring members 77 in a plan view from the positive Z direction. The pair of openings 377 are formed larger than the coil outer shape of the pair of spring members 77. Therefore, when the blue adjustment mechanism 70 is assembled, the pair of openings 377 can be passed through the spring member 77.

The pair of openings 392 are provided at positions corresponding to the actuators 112 and 113 in a plan view from the positive Z direction. Each of the pair of openings 392 is formed to be larger than the shape of the cross section of the actuators 112 and 113 parallel to the XY plane. Therefore, the pair of openings 392 serve as escapes for the actuators 112 and 113 when the blue adjustment mechanism 70 is assembled.

Actuators 211 and 212 are provided on the negative Z direction side of the third plate 301 to form a pair. The pair of actuators 211 and 212 are arranged to face the pair of abutting portions 351 and 352 and the first elastic member 231 in the positive and negative X directions in a plan view from the positive Z direction. The actuator 211 has a first linear motion unit a1, and the actuator 212 has a second linear motion unit a2. In other words, the second actuator 210 has a first linear motion unit a1 and a second linear motion unit a2. The first linear motion portion a1 and the second linear motion portion a2 come into contact with the second plate 201.

As shown in FIG. 8, the base 400 has a substantially rectangular shape, and its long side is arranged along the Y axis. The base 400 has a connecting portion 451 and 452, a polarizing plate 405, openings 491, 494, and a pair of openings 477,492. Further, the third actuator 310 is arranged so as to penetrate the base 400 in the positive and negative Z directions.

The connecting portions 451 and 452 are columnar protrusions protruding in the positive Z direction from the substantially flat base 400, and form a pair. The connecting portions 451 and 452 are on the long side of the base 400 on the negative X direction side, and are provided at both ends of the long side. Specifically, the connecting portion 451 is provided on the positive Y direction side, and the connecting portion 452 is provided on the negative Y direction side. The end portion of the second elastic member 332 is connected to the connecting portion 451. The end portion of the third elastic member 333 is connected to the connecting portion 452.

The polarizing plate 405 is provided at a position overlapping the blue display panel 40B in a plan view from the positive Z direction. The polarizing plate 405 is an emitting side polarizing element of the blue display panel 40B. The light modulated by the blue display panel 40B is emitted through the polarizing plate 405.

The openings 491 and 494 and the pair of openings 477 and 492 are openings that penetrate the base 400. The opening 491 is provided at a position corresponding to the actuators 111, 211 and the spring member 76 in a plan view from the positive Z direction. The opening 491 is formed to be larger than the shape of the actuators 111 and 211 having a cross section parallel to the XY plane and the coil outer shape of the spring member 76. Therefore, when the blue adjustment mechanism 70 is assembled, the opening 491 serves as a relief for the actuators 111 and 211 and allows the spring member 76 to pass through.

The pair of openings 477 are provided at positions corresponding to the pair of spring members 77 in a plan view from the positive Z direction. The pair of openings 477 are formed larger than the coil outer shape of the pair of spring members 77. Therefore, the pair of openings 477 can be passed through the spring member 77 when the blue adjustment mechanism 70 is assembled.

The pair of openings 492 are provided at positions corresponding to the actuators 112 and 113 in a plan view from the positive Z direction. Each of the pair of openings 492 is formed to be larger than the shape of the cross section of the actuators 112 and 113 parallel to the XY plane. Therefore, when the blue adjustment mechanism 70 is assembled, the pair of openings 492 serve as escapes for the actuators 112 and 113, respectively.

The opening 494 is provided at a position corresponding to the actuator 212 in a plan view from the positive Z direction. The opening 494 is formed larger than the shape of the cross section of the actuator 212 parallel to the XY plane. Therefore, the opening 494 serves as a relief for the actuator 212 when the blue adjustment mechanism 70 is assembled.

Next, the configurations of the first actuator 110, the second actuator 210, and the third actuator 310 will be described with reference to FIG. FIG. 9 is a schematic cross-sectional view showing the configuration of the actuator. Here, the first actuator 110, the second actuator 210, and the third actuator 310 have the same configuration, although the portions and directions arranged in the blue adjustment mechanism 70 are different. Therefore, in FIG. 9, the actuator 111 of the first actuator 110 is shown as a representative example. Note that FIG. 9 shows a cross section of the actuator 111 that is parallel to the YZ plane and passes through the center of the linear motion portion described later.

As shown in FIG. 9, the actuator 111 has a drive unit 171, a disk member 173, a lead screw 175, a nut unit 177, and a linear motion unit a. The actuator 111 is a substantially rectangular parallelepiped and is a drive source for moving the position of the blue display panel 40B.

The nut portion 177 is arranged at substantially the center of the actuator 111 in a plan view from the positive Z direction. A part of the nut portion 177 projects from the surface of the actuator 111 on the positive Z direction side. On the other hand, the negative Z direction side of the nut portion 177 is immersed in the inside of the actuator 111. The nut portion 177 is provided with a columnar through hole that pierces the positive and negative Z directions. A female screw is provided on the inner surface on the negative Z direction side of the through hole.

A linear motion portion a is fitted on the positive Z direction side of the through hole in the nut portion 177. The positive Z direction side of the linear motion portion a protrudes from the nut portion 177. That is, the tip of the linear motion portion a on the positive Z direction side protrudes toward the positive Z direction side of the actuator 111. The portion of the linear motion portion a at the tip protruding from the nut portion 177 is larger than the portion that fits into the through hole. Therefore, the linearly moving portion a does not further immerse in the negative Z direction with respect to the nut portion 177 from the state shown in FIG. The tip of the linear motion portion a is formed into a curved surface and abuts on the surface on the negative Z direction side of the first plate 101 shown in FIG.

A lead screw 175 is arranged on the negative Z direction side of the linear motion portion a. The lead screw 175 has a shape rotationally symmetric with respect to a straight line parallel to the Z axis, and has an axis arranged along the Z axis. In the shaft, a collar portion is provided at substantially the center in the positive and negative Z directions, and a male screw is provided on the positive Z direction side from the flange portion. As a result, the male screw of the lead screw 175 and the female screw of the nut portion 177 are screwed together, and a part of the shaft of the lead screw 175 is fitted into the nut portion 177.

A disk member 173 is fitted and fixed to the flange portion of the lead screw 175 on the positive Z direction side. The disk member 173 is a disk having a circular opening in the center in a plan view from the positive Z direction, and the shaft of the lead screw 175 penetrates the opening. The disk member 173 is arranged along the XY plane. The central axis of the through hole of the nut portion 177 coincides with the rotationally symmetric axis of the lead screw 175 and the disk member 173. Therefore, when the disk member 173 rotates about the axis, the lead screw 175 also rotates. The male screw of the lead screw 175 is screwed with the female screw of the nut portion 177. Since the rotation of the nut portion 177 synchronized with the rotation of the lead screw 175 is restricted, the rotation of the lead screw 175 causes the nut portion 177 to move in the positive and negative Z directions.

In a plan view from the positive Z direction, the drive unit 171 is in contact with the outer periphery of the disk member 173. The drive unit 171 is a piezoelectric element, and the inverse piezoelectric effect is exhibited by applying a voltage. Due to the inverse piezoelectric effect, the disk member 173 receives a force that rotates in the circumferential direction from the drive unit 171. By applying a voltage, the drive unit 171 can rotate the disk member 173. Further, the drive unit 171 can rotate the disk member 173 in the reverse direction as described above by setting the applied voltage to the reverse potential. Signal wiring and power supply wiring are connected to the drive unit 171. The signal wiring is connected to a control unit (not shown) of the projector 1. The control unit is, for example, a CPU (Central Processing Unit). The power supply wiring is connected to a power supply unit (not shown) of the projector 1.

With the above configuration, when the drive unit 171 rotates the disk member 173 clockwise in a plan view from the positive Z direction, the lead screw 175 also rotates in the same direction. Therefore, the nut portion 177 moves in the positive Z direction while the through hole is screwed with the shaft of the lead screw 175. As a result, the nut portion 177 protrudes together with the linear motion portion a. That is, by controlling the operation of the drive unit 171, the amount of protrusion of the tip of the linear motion unit a in the positive Z direction, in other words, the amount of movement changes.

On the other hand, when the drive unit 171 rotates the disk member 173 counterclockwise in a plan view from the positive Z direction, the lead screw 175 also rotates in the same direction. Therefore, the nut portion 177 moves in the negative Z direction while the through hole is screwed with the shaft of the lead screw 175. As a result, the nut portion 177 moves so as to be immersed in the actuator 111 together with the linear motion portion a. That is, by controlling the operation of the drive unit 171, the amount of protrusion of the tip of the linear motion unit a in the negative Z direction changes. As a result, the linear motion portion a of the actuator 111 can linearly move in the positive and negative Z directions.

The above-mentioned actions are the same for the first actuator 110, the second actuator 210, and the third actuator 310 other than the actuator 111, and the description thereof will be omitted.

In the present embodiment, the actuator 111 using the piezoelectric element as a drive source has been illustrated, but the present invention is not limited to this. As the first actuator 110, the second actuator 210, and the third actuator 310, a combination of an electromagnetic motor and a ball screw, a voice coil motor, a solenoid actuator, or the like may be adopted.

As described above, the blue adjustment mechanism 70 has the above configuration. As described above, since the red adjustment mechanism 80 on which the red display panel 40R is mounted has the same configuration as the blue adjustment mechanism 70, the description of the red adjustment mechanism 80 will be omitted.

1.3. Adjustment Method Next, a method of adjusting the position of the display panel 40 in the adjustment mechanism 7 will be described by taking the blue adjustment mechanism 70 and the blue display panel 40B as examples. The position adjustment method of the red display panel 40R in the red adjustment mechanism 80 is the same as that of the blue adjustment mechanism 70, and thus the description thereof will be omitted.

13.1. Three-axis adjustment method of θxθyZ The three-axis adjustment method of θxθyZ in the first stage 100 will be described with reference to FIGS. 10A, 10B, and 10C. FIG. 10A is a schematic view showing a uniaxial adjustment method of Z. FIG. 10B is a schematic view showing a method of adjusting θx on one axis. FIG. 10C is a schematic diagram showing a uniaxial adjustment method of θy. Here, in FIGS. 10A, 10B and 10C, only the first actuator 110 mounted on the second plate 201 and the second plate 201 is illustrated, and the other configurations are not shown.

As shown in FIG. 10A, the three actuators 111, 112, 113 as the first actuator 110 are arranged at each apex of the triangle with the opening 281 in between in a plan view from the positive Z direction. .. In the actuators 111, 112, 113, the tips of the linear motion portions a are arranged so as to face the positive Z direction. The tips of the three linear motion portions a correspond to the first plate 101 (not shown) located on the positive Z direction side of the second plate 201 from the negative Z direction in the direction along the Z axis. Get in touch. As described above, each of the linear motion portions a of the three actuators 111, 112, and 113 linearly moves in the positive and negative directions.

When each of the linear motion portions a of the three actuators 111, 112, 113 is linearly moved by an amount of protrusion equal to the positive and negative Z directions, the first plate 101 with which the linear motion portions a abuts becomes the second plate 201. It moves in the positive and negative Z directions. This makes it possible to adjust the position of one axis of Z.

The three actuators 111, 112, 113 can be operated individually. Therefore, it is possible to individually change the amount of protrusion in the positive and negative Z directions of the three linear motion portions a.

As shown in FIG. 10B, the linear motion of the actuator 112 as the second actuator and the linear motion of the actuator 113 as the third actuator are relative to the linear motion of the actuator 111 as the first actuator. The part a and the part a are operated by the amount of protrusion equal to the positive and negative Z directions. As a result, the first plate 101 moves in the θx direction with respect to the second plate 201.

As used herein, relative to the linear motion portion a of the actuator 111 refers to any of the following three cases. One is a case where the linear motion portion a of the actuator 111 is fixed and the linear motion portions a of the actuators 112 and 113 are linearly moved. The other is a case where the linear moving portions a of the actuators 112 and 113 are linearly moved in the direction opposite to the direction in which the linear moving portion a of the actuator 111 is linearly moved. The other is to linearly move each of the linear motion portions a of the actuators 112 and 113 in the same direction as the linear motion portion a of the actuator 111, exceeding the protrusion amount of the linear motion portion a of the actuator 111. It is a case to let.

Further, in each of the linear motion portions a of the three actuators 111, 112, 113, the amount of protrusion increases according to the distance and direction from the geometric center of the blue display panel 40B, in other words, the coordinate points of the linear motion portions a. It is more preferable to be determined.

Specifically, the triangles shown by the broken lines formed by the contact points between the tips of the linear motion portions a of the actuators 111, 112, and 113 and the first plate 101 are arranged along the XY plane. The geometric center of the blue display panel 40B is located inside the triangle in a plan view from the positive Z direction. The movement in the θx direction is the rotation of the triangle in the θx direction. Therefore, when each of the linear motion portions a of the actuators 112 and 113 is linearly moved by an amount of protrusion equal to the positive Z direction, the movement in the θx direction becomes a counterclockwise rotation when viewed from the negative X direction.

On the other hand, when each of the linear motion portions a of the actuators 112 and 113 is linearly moved by an amount of protrusion equal to the negative Z direction, the movement in the θx direction is a clockwise rotation when viewed from the negative X direction. Become. This makes it possible to adjust the position of θx on one axis.

As shown in FIG. 10C, the linear motion portion a of the actuator 112 and the linear motion portion a of the actuator 113 are opposite to each other in the positive and negative Z directions, relative to the linear motion portion a of the actuator 111. By moving linearly in the direction, the first plate 101 moves in the θy direction with respect to the second plate 201. Here, relative to the linear motion portion a of the actuator 111, means the protrusion amount of each of the linear motion portions a of the actuators 112 and 113 with respect to the protrusion amount of the linear motion portion a of the actuator 111, as described above. It is not limited to the case where the linear motion portion a of the actuator 111 is fixed.

Specifically, the movement in the θy direction is the rotation of the triangle illustrated by the broken line in the θy direction. That is, when the linear motion portion a of the actuator 112 is linearly moved in the negative Z direction and the linear motion portion a of the actuator 113 is linearly moved in the positive Z direction, the movement in the θy direction is from the positive Y direction. Seeing it turns counterclockwise. This state is shown in FIG. 10C.

On the other hand, when the linear motion portion a of the actuator 112 is linearly moved in the positive Z direction and the linear motion portion a of the actuator 113 is linearly moved in the negative Z direction, the movement in the θy direction is positive. The rotation is clockwise when viewed from the Y direction. This makes it possible to adjust the position of θy on one axis.

By performing the above-mentioned uniaxial adjustment of Z, uniaxial adjustment of θx, and uniaxial adjustment of θy in combination, the position adjustment of the three axes of θxθyZ on the first plate 101 is performed. Here, the second plate 201 is connected to the base 400 via the third plate 301 shown in FIG. The base 400 is fixed to the cross dichroic prism 50. Further, the cross dichroic prism 50 is fixed to the projection lens 60.

Therefore, the movement of the first plate 101 with respect to the second plate 201 described above is a movement with respect to the cross dichroic prism 50 and the projection lens 60. As a result, the position of the blue display panel 40B mounted on the first plate 101 is moved with respect to the cross dichroic prism 50 and the projection lens 60, and the positions of the three axes of θxθyZ are adjusted. In other words, as the first plate 101 moves in the positive and negative Z directions, the θx direction, and the θy direction, the position of the blue display panel 40B with respect to the projection lens 60 changes, and the projection lens with respect to the blue display panel 40B changes. The focus of 60 is adjusted.

1.3.2. YXθz 3-axis adjustment method The YXθz 3-axis adjustment in the adjustment mechanism 7 of the present embodiment includes the adjustment of the Xθz 2-axis between the second stage 200 and the third stage 300, and the third stage 300 and the base 400. Includes uniaxial adjustment of Y between and.

First, a method of adjusting the two axes of Xθz in the second stage 200 and the third stage 300 will be described with reference to FIGS. 11A, 11B, 12A, and 12B. 11A and 11B are perspective views showing a third plate and a second plate mounted on the third plate. FIG. 12A is a schematic plan view showing a uniaxial adjustment method of X. FIG. 12B is a schematic plan view showing a uniaxial adjustment method of θz. Note that FIG. 11B shows a state in which the second plate 201 and the third plate 301 are viewed from the negative Z direction side, which is the back surface side of FIG. 11A. Further, in FIGS. 12A and 12B, each configuration is schematically shown in a plan view viewed from the positive Z direction.

As shown in FIG. 11A, when the third plate 301 and the second plate 201 are assembled, a pair of contact portions 241 of the second plate 201 and the third plate 301 come into contact with each other via the first elastic member 231. Units 351 and 352 are connected.

The first elastic member 231 is in the positive X direction, which is one direction along the X axis in the initial state in which the first linear motion portion a1 and the second linear motion portion a2 of the second actuator 210 are not linearly moving. Is preloaded. Specifically, in the first elastic member 231, substantially the center in the longitudinal direction is connected to the connecting portion 241 and both end portions in the longitudinal direction are connected to the contact portions 351 and 352, respectively. In the first elastic member 231, the position connected to the connecting portion 241 is from the positive X direction rather than the position connected to the contact portions 351 and 352 when viewed from the positive Y direction. Therefore, in a plan view from the positive Z direction, the first elastic member 231 is arranged so as to be convexly curved in the positive X direction with the position connected to the connecting portion 241 as the apex.

As shown in FIG. 11B, the convex portion 261 of the second plate 201 projects from the opening 391 of the third plate 301 in the negative Z direction. A convex portion 262 of the second plate 201 projects from the opening 393 of the third plate 301 in the negative Z direction.

The first linear motion portion a1 and the second linear motion portion a2 are arranged so as to face the positive X direction and come into contact with the second plate 201. Specifically, the first linear motion portion a1 of the actuator 211 abuts on the convex portion 261 of the second plate 201 from the negative X direction, which is the other direction along the X axis. The second linear motion portion a2 of the actuator 212 abuts on the convex portion 262 of the second plate 201 from the negative X direction.

Each of the first linear motion portion a1 and the second linear motion portion a2 projects in the positive X direction, thereby pressing the second plate 201 in the positive X direction via the convex portions 261,262. Here, in the openings 391 and 393, the convex portions 261,262 can move in the positive and negative X directions by pressing the first linear motion portion a1 and the second linear motion portion a2 in a plan view from the positive Z direction. It is formed to a size.

As shown in FIG. 12A, the first elastic member 231 and the pair of actuators 211 and 212 are arranged to face each other in the positive and negative X directions in a plan view from the positive Z direction. When the first linear motion portion a1 and the second linear motion portion a2 linearly move by the amount of protrusion equal to the positive X direction and press the convex portions 261,262, the first linear motion portion a1 and the second linear motion portion a2 Each protrusion amount becomes equal. Therefore, the second plate 201 moves in the positive X direction against the elastic rebound of the first elastic member 231.

On the other hand, when the protrusion amount of the first linear motion portion a1 and the second linear motion portion a2 is attenuated from the state in which the second plate 201 is moved in the positive X direction, the second plate 201 is moved. It moves in the negative X direction due to the elastic rebound of the first elastic member 231. As a result, the second plate 201 moves in the positive and negative X directions with respect to the third plate 301. This makes it possible to adjust the position of one axis of X.

Here, since the first elastic member 231 is preloaded in the positive X direction, the play in the first elastic member 231 is reduced as compared with the case where the preload is not applied. Thereby, the responsiveness of the movement of the second plate 201 to the linear movement of the first linear motion portion a1 and the second linear motion portion a2, that is, the protrusion can be improved.

Here, the pair of actuators 211 and 212 can be operated individually. Therefore, it is also possible to individually set the amount of protrusion in the positive and negative X directions in the first linear motion unit a1 and the second linear motion unit a2.

When the amount of protrusion of the first linear motion portion a1 in the positive and negative X directions and the amount of protrusion of the second linear motion portion a2 in the positive and negative X directions are different, the second plate 201 is clocked with respect to the third plate 301. It moves in the θz direction in the clockwise or counterclockwise direction.

Specifically, as shown in FIG. 12B, when the actuator 211 is not fixedly operated and the second linear motion portion a2 of the actuator 212 is linearly moved in the positive X direction, the second linear motion portion a2 of the actuator 212 is moved. The second plate 201 is pressed in the positive X direction via the convex portion 262. As a result, the second plate 201 moves in the θz direction counterclockwise with respect to the third plate 301 in a plan view from the positive Z direction.

On the other hand, when the actuator 212 is not fixed and operated and the first linear motion portion a1 of the actuator 211 is linearly moved in the positive X direction, the first linear motion portion a1 of the actuator 211 passes through the convex portion 261. The second plate 201 is pressed in the positive X direction. As a result, the second plate 201 moves in the clockwise θz direction with respect to the third plate 301 in a plan view from the positive Z direction. As described above, the position of θz on one axis can be adjusted.

Here, the method of making the amount of protrusion of the first linear motion unit a1 in the positive and negative X directions different from the amount of protrusion of the second linear motion unit a2 in the positive and negative X directions is to not operate one of the actuators 211 and 212. Not limited to. In order to make the above two protrusion amounts different, both actuators 211 and 212 may be operated to make the protrusion amounts different.

Next, a method of adjusting one axis of Y in the third stage 300 and the base 400 will be described with reference to FIGS. 13 and 14. FIG. 13 is a perspective view showing the base and the third plate mounted on the base. FIG. 14 is a schematic plan view showing a method of adjusting one axis of Y. In addition, in FIG. 14, each configuration is schematically shown in a plan view viewed from the positive Z direction.

As shown in FIG. 13, when the base 400 and the third plate 301 are assembled, the contact portion 351 and the connection portion 451 are connected to each other via the second elastic member 332 and the third elastic member 333, and the contact portion 451 is contacted. The unit 352 and the connection unit 452 are connected. As a result, the second elastic member 332 and the third elastic member 333 connect the base 400 and the third plate 301, and restrict the movement of the third plate 301 with respect to the base 400 in the positive and negative Y directions.

The second elastic member 332 is preloaded in the positive Y direction in the initial state in which the third plate 301 is not pressed by the third actuator 310. Specifically, when viewed from the negative X direction, the position where one end of the second elastic member 332 is connected in the contact portion 351 is from the position where the other end of the second elastic member 332 is connected in the connection portion 451. Is also from the positive Y direction.

The third elastic member 333 is preloaded in the positive Y direction in the initial state in which the third plate 301 is not pressed by the third actuator 310. Specifically, when viewed from the negative X direction, the position where one end of the third elastic member 333 is connected in the contact portion 352 is from the position where the other end of the third elastic member 333 is connected in the connection portion 452. Is also from the positive Y direction.

Due to the preload described above, the second elastic member 332 and the third elastic member 333 are arranged so as to be curved in a substantially S shape in a plan view from the positive Z direction in the initial state.

As shown in FIG. 14, the linear motion portion a of the third actuator 310 is arranged so as to be linearly movable in the positive and negative Y directions in a plan view from the positive Z direction. When the linear motion portion a abuts and presses against the third plate 301 from the negative Y direction, the third plate 301 opposes the elastic rebound of the second elastic member 332 and the third elastic member 333 in the positive Y direction. Move to.

On the other hand, when the protrusion of the linear motion portion a in the third actuator 310 is damped from the state in which the third plate 301 has moved in the positive Y direction, the third plate 301 has a second elastic member. It moves in the negative Y direction due to the elastic rebound of 332 and the third elastic member 333. As a result, the third plate 301 moves in the positive and negative Y directions with respect to the base 400. This makes it possible to adjust the position of one axis of Y.

Here, since the second elastic member 332 and the third elastic member 333 are preloaded in the positive Y direction, the second elastic member 332 and the third elastic member 332 are compared with the case where the preload is not applied. Play at 333 is reduced. As a result, the responsiveness of the movement of the third plate 301 to the linear motion of each linear motion unit a can be improved.

By performing the above-mentioned uniaxial adjustment of Y, uniaxial adjustment of X, and uniaxial adjustment of θz in combination, the positions of the three axes of YXθz on the second plate 201 are adjusted. A blue display panel 40B is mounted on the second plate 201 via the first plate 101. Therefore, the positions of the three axes of YXθz of the blue display panel 40B are adjusted with respect to the base 400. That is, the position of the blue display panel 40B is moved with respect to the cross dichroic prism 50 and the projection lens 60, and the positions of the three axes of YXθz are adjusted. As a result, the pixel shift adjustment between the blue display panel 40B and the other display panel 40 is performed.

With the configuration of the blue adjustment mechanism 70 described above, the position of the blue display panel 40B can be adjusted with six axes of θxθyZ and YXθz. As described above, the red adjustment mechanism 80 on which the red display panel 40R is mounted has the same configuration as the blue adjustment mechanism 70. Therefore, the position of the blue display panel 40B can also be adjusted by the red adjustment mechanism 80 on the six axes of θxθyZ and YXθz.

Therefore, the position of the red display panel 40R changes due to the movement of the first plate, the second plate, and the third plate (not shown) in the red adjustment mechanism 80, and the first plate 101 and the second plate 101 in the blue adjustment mechanism 70 change. The position of the blue display panel 40B changes due to the movement of the plate 201 and the third plate 301. As a result, in the projector 1, the red display panel 40R and the blue display panel 40B are positioned with respect to the green display panel 40G, and focus adjustment and pixel shift adjustment can be performed.

In the present embodiment, from the blue display panel 40B toward the base 400, the first stage 100 is responsible for the three-axis adjustment of θxθyZ, the second stage 200 is responsible for the two-axis adjustment of Xθz, and the Y is responsible for the one-axis adjustment. The configuration in which the third stage 300 is arranged in this order is illustrated, but the present invention is not limited to this.

As described above, according to the adjustment mechanism 7 and the projector 1 according to the present embodiment, the following effects can be obtained.

The positions of the blue display panel 40B and the red display panel 40R in the projector 1 can be adjusted by the six axes of θxθyZ and YXθz.

The three axes of θxθyZ are adjusted by the first stage 100, and the focus of the projection lens 60 on the blue display panel 40B can be adjusted. Further, the three axes of YXθz can be adjusted by the second stage 200 and the third stage 300 to adjust the pixel shift between the blue display panel 40B and the other display panel 40. Therefore, it is possible to provide the projector 1 capable of adjusting the focus and the pixel shift of the display panel 40.

Since the first plate 101 is arranged closer to the blue display panel 40B than the second plate 201 and the third plate 301, even if the pixel deviation is adjusted on the three axes of YXθz, it is related to the three axes of θxθyZ. No more out of focus. That is, the focus adjustment and the pixel shift adjustment can be performed independently.

Not limited to the adjustment in the manufacturing process, when the focus adjustment and the pixel shift adjustment become necessary due to the influence of aging and the usage environment, the adjustment mechanism 7 can be used for the adjustment. That is, the quality of the image or the like projected from the projector 1 can be well maintained for a long period of time.

The positions of the red display panel 40R and the blue display panel 40B are adjusted with respect to the green display panel 40G. That is, in the projector 1 provided with the three display panels of the green display panel 40G, the red display panel 40R, and the blue display panel 40B, the position can be adjusted with reference to the green display panel 40G.

Since leaf springs are used as the first elastic member 231 and the second elastic member 332 and the third elastic member 333, a guide is not required. As a result, the thickness of the adjusting mechanism 7 in the positive and negative Z directions can be reduced.

The first actuator 110, the second actuator 210, and the third actuator 310 employ a piezoelectric element as the drive unit 171. Therefore, the actuator can be easily reduced in size and weight. Therefore, the adjusting mechanism 7 can be made compact and lightweight while having a plurality of actuators. Further, the projector 1 can be easily reduced in size and weight.

The contents derived from the embodiment are described below.

The adjustment mechanism is an adjustment mechanism on which a display panel is mounted and adjusts the position of the display panel, and includes a first stage in which the display panel is mounted on a mounting portion, a second stage that supports the first stage, and the like. A third stage that supports the second stage is provided, and when the surface is mounted on the mounting portion of the display panel and the surface parallel to the display surface of the display panel is used as the reference surface, the surface is orthogonal to the reference surface. The coordinate axes are the Z axis, the coordinate axes orthogonal to each other in the reference plane are the X axis and the Y axis, the rotation direction around the X axis is the θx direction, the rotation direction around the Y axis is the θy direction, and the rotation direction around the Z axis. When is in the θz direction, the first stage has a first plate on which the display panel is placed and a first actuator that moves the first plate in the directions along the Z axis, the θx direction, and the θy direction. However, the second stage has a second plate on which the first plate is placed, and a second actuator that moves the second plate in the direction along the X axis and the θz direction. It is characterized by having a third plate on which the second plate is placed and a third actuator that moves the third plate in a direction along the Y axis.

According to this configuration, the position of the display panel can be adjusted with 6 axes. Specifically, the first stage adjusts the three axes of θxθyZ on the display panel. The second stage and the third stage make a three-axis adjustment of YXθz in the display panel. Therefore, it is possible to provide an adjustment mechanism for adjusting the position of the display panel in the projector with six axes.

Since the first plate is arranged closer to the display panel than the second plate and the third plate, the three axes of θxθyZ do not shift even if the three axes of YXθz are adjusted. That is, the 3-axis adjustment of θxθyZ and the 3-axis adjustment of YXθz can be performed independently.

The projector includes a light source, a display panel that modulates the light emitted from the light source, a projection lens that projects the light modulated by the display panel, and the above-mentioned adjustment mechanism on which the display panel is mounted. By moving the first plate in the directions along the Z axis, the θx direction, and the θy direction, the position of the display panel with respect to the projection lens is changed, and the focus of the projection lens with respect to the display panel is adjusted. ..

According to this configuration, the three axes of θxθyZ are adjusted by the first stage, and the focus of the projection lens on the display panel can be adjusted. Further, the three axes of YXθz are adjusted by the second stage and the third stage, and the pixel deviation can be adjusted. Therefore, it is possible to provide a projector capable of adjusting the focus and the pixel shift of the display panel.

Since the first plate is arranged closer to the display panel than the second plate and the third plate, even if the pixel shift is adjusted on the three axes of YXθz, the focus on the three axes of θxθyZ does not shift. .. That is, the focus adjustment and the pixel shift adjustment can be performed independently.

When focus adjustment and pixel shift adjustment are required due to aging and the influence of the usage environment, it is possible to make adjustments using the adjustment mechanism. That is, the quality of the image projected from the projector can be maintained satisfactorily for a long period of time.

As display panels, the above projector includes a green display panel that modulates green light, a red display panel that modulates red light, and a blue display panel that modulates blue light among the light emitted from a light source. As the adjustment mechanism, a red adjustment mechanism for adjusting the position of the red display panel and a blue adjustment mechanism for adjusting the position of the blue display panel are provided, and the second plate and the third plate in the red adjustment mechanism are provided. By moving, the position of the red display panel changes, and by moving the second and third plates in the blue adjustment mechanism, the position of the blue display panel changes, and the position of the blue display panel changes with respect to the green display panel. It is preferable that the display panel and the blue display panel are positioned.

According to this configuration, the positions of the red display panel and the blue display panel are adjusted with respect to the green display panel. That is, in a projector provided with three display panels, a green display panel, a red display panel, and a blue display panel, the position can be adjusted with reference to the green display panel.

The above projector includes a color synthesis optical system that synthesizes the light emitted from each of the red display panel, the green display panel, and the blue display panel, and is the first stage, the second stage, and the third stage. It is preferable that the three stages are located on the side closest to the color synthesis optical system and the first stage is located on the side farthest from the color synthesis optical system.

According to this configuration, the first stage is located farther from the color synthesizing optical system than the second and third stages. That is, the first stage can be arranged closer to the display panel than the second and third stages. As a result, even if the pixel shift is adjusted on the three axes of YXθz, the focus on the three axes of θxθyZ does not shift.

1 ... Projector, 7 ... Adjustment mechanism, 11 ... Light source, 40 ... Display panel, 40R ... Red display panel, 40G ... Green display panel, 40B ... Blue display panel, 50 ... Cross dicroic prism as prism, 60 ... Projection lens, 70 ... blue adjustment mechanism, 71 ... mounting part, 80 ... red adjustment mechanism, 100 ... first stage, 101 ... first plate, 110 ... first actuator, 111 ... actuator as first actuator , 112 ... Actuator as a second actuator, 113 ... Actuator as a third actuator, 200 ... Second stage, 201 ... Second plate, 210 ... Second actuator, 211,212 ... Actuator as a second actuator , 231 ... 1st elastic member, 300 ... 3rd stage, 301 ... 3rd plate, 310 ... 3rd actuator, 332 ... 2nd elastic member, 333 ... 3rd elastic member, 351,352 ... contact portion, 400 ... base, a ... linear motion part, a1 ... first linear motion section, a2 ... second linear motion section, R ... red light, B ... blue light, G ... green light.

Claims (4)

An adjustment mechanism that is equipped with a display panel and adjusts the position of the display panel.
The first stage in which the display panel is mounted on the mounting portion, and
The second stage that supports the first stage and
A third stage that supports the second stage is provided.
When the plane parallel to the display plane of the display panel is used as the reference plane in the state of being mounted on the previously described mounting portion of the display panel, the coordinate axis orthogonal to the reference plane is set as the Z axis and the inside of the reference plane. Let the coordinate axes orthogonal to each other be the X-axis and the Y-axis.
When the rotation direction around the X axis is the θx direction, the rotation direction around the Y axis is the θy direction, and the rotation direction around the Z axis is the θz direction.
The first stage has a first plate on which the display panel is placed, and a first actuator that moves the first plate in a direction along the Z axis, a θx direction, and a θy direction. ,
The second stage has a second plate on which the first plate is placed, and a second actuator that moves the second plate in a direction along the X axis and in the θz direction.
The third stage is an adjusting mechanism having a third plate on which the second plate is placed and a third actuator that moves the third plate in a direction along the Y axis. A light source, the display panel that modulates the light emitted from the light source, and
A projection lens that projects modulated light on the display panel,
The adjustment mechanism according to claim 1, wherein the display panel is mounted, is provided.
As the first plate moves along the Z axis, the θx direction, and the θy direction, the position of the display panel with respect to the projection lens changes, and the focus of the projection lens with respect to the display panel is changed. The projector to be adjusted. As the display panel, among the light emitted from the light source, a green display panel that modulates green light, a red display panel that modulates red light, and a blue display panel that modulates blue light.
The adjustment mechanism includes a red adjustment mechanism for adjusting the position of the red display panel and a blue adjustment mechanism for adjusting the position of the blue display panel.
The position of the red display panel changes due to the movement of the second plate and the third plate in the red adjustment mechanism, and the movement of the second plate and the third plate in the blue adjustment mechanism causes the above. The projector according to claim 2, wherein the position of the blue display panel is changed so that the red display panel and the blue display panel are positioned with respect to the green display panel. A color synthesis optical system for synthesizing light emitted from each of the red display panel, the green display panel, and the blue display panel is provided.
Of the first stage, the second stage, and the third stage, the third stage is located on the side closest to the color synthesis optical system, and the first stage is located on the side farthest from the color synthesis optical system. The projector according to claim 3, which is located.

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