JP2006235566A - 3-dimensional image projecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a 3-dimensional image projecting device having simple structure and realizing a bright and easy-to-view stereoscopic picture around which an unnecessary image does not appear by one projector. <P>SOLUTION: The projecting device is constituted so that the stereoscopic picture constituted by arranging stereoscopic right and left pictures up and down is projected from the projector, and this projected luminous flux is divided into two at both-picture division point P corresponding to a boundary between both pictures, and the divided luminous fluxes of both pictures are respectively made to pass through a 1st mirror, a 2nd mirror and filters corresponding to them, and further made to go via a common 3rd mirror so as to superpose and project both pictures onto a screen. The projected both pictures are stereoscopically viewed through filter spectacles. The stereoscopic vision of the easy-to-view picture is realized by a shielding plate set on a side corresponding to the boundary between both pictures and coming into contact with the division point P at a position astern of the division point P, and getting into the picture by almost half of blur width so as to intercept the unnecessary luminous flux. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stereoscopic video projector.

  Conventionally, stereoscopic viewing by projector projection, in particular, requires two devices, and the left and right screens are superimposed and projected by two projectors with light of different polarities, and this is viewed stereoscopically through polarized glasses, etc. It was general. In addition, there was also the idea of realizing this with a single projector, but in particular, a vertical 3D screen was used, in which the 3D left and right screens were arranged one above the other, and each screen was subjected to different polarizations. A method of superimposing the luminous flux of the screen and projecting it onto the screen for stereoscopic viewing has been proposed (Patent Document 1, Fig. 3). There are several similar proposals thereafter, and there are proposals such as performing projection of superposition with a prism (Patent Documents 1 and 2) or a mirror (Patent Documents 3 and 4). However, in these cases, a single screen is projected around each of the superimposed stereoscopic screens, or the blur of the boundary between the left and right screens cannot be removed, resulting in a stereoscopic screen that is difficult to see ( (Patent Documents 1, 2, 3, 5) and another set of polarizing filters to avoid this (Patent Document 4), etc., as the device becomes more complex, the transmission efficiency decreases and the screen becomes darker. We had problems such as.

JP 08-110494 JP 09-281616 JP2001-305478 JP 08-079801 JP2005-62607

  The problem to be solved by the present invention has problems that could not be realized until now, such as high transmission efficiency and bright screen, and unnecessary portions of each screen appearing in the periphery of the stereoscopic image part, making it difficult to see. The object is to realize a stereoscopic image projection device that enables a single projector to display a stereoscopic screen that is bright and easy to see and has a simple structure.

In order to solve the above-described problems, the present invention firstly
A projector that projects a vertical three-dimensional screen composed of three-dimensional left and right screens arranged vertically, and this projected light beam is divided into two divided screens at both screen separation points P corresponding to the boundary lines between the two screens. On the side that is in contact with the separation point P of the split double-screen light beam, for a configuration that includes a both-screen separation conversion mirror optical system that has a function of projecting a light beam with different polarities on the screen through a filter. A 3D image projection device with a 3D screen with a clear boundary surface by providing a fixed or variable length shielding plate that is set to enter only about half of the blur width from the center boundary line of the screen and shields unnecessary portions of the screen Realized.

  Further, as a both-screen separation conversion mirror optical system for separating the left and right screens, which is the basis of the present invention, the projected light beam is divided into two, and one of the light beams is emitted at a substantially right angle to the opposite side of the other light beam by the first mirror. The other light beam is reflected by a second mirror set at a certain distance from the first mirror and reflected in substantially the same direction as the reflected light beam. By introducing the system, we realized a structure with this shielding plate on the outermost side of both split screens.

  Furthermore, as this both-screen separation conversion mirror optical system, the projection light beam is divided into two, one of which intersects with the other light beam by the first mirror and goes outside, and the other light beam does not have a fixed distance from the first mirror. By constructing a fixed or variable angle right-and-left double screen separating conversion mirror having a configuration that reflects the reflected light beam in substantially the same direction by the second mirror set in this way, this shielding plate is divided into two screens in reverse. Realized a compact 3D image device on each inner side.

  Further, in the case of the separation conversion mirror optical system in which the above-described first and second mirrors are arranged, as a shielding plate used here, it is installed between the first and second mirrors, and the height and the angle protruding from this space By setting a single shielding plate with variable and defining the angle and height components to the left and right screens as the shielding amount to each, one shielding plate can shield both the left and right screens. Realized the configuration to set.

  In order to obtain a practical function based on the above basic configuration according to the present invention, a projection light beam entering from the front is emitted in the vertical direction by the right-angle and double-screen separation conversion mirror optical system, and further this vertical projection output is obtained. By setting a third mirror having a fixed or variable angle to be converted to a right angle forward, an upright stereoscopic image is projected forward, and in addition to the superimposition of the stereoscopic screen projected forward, this third It was possible to adjust the position of the projection screen itself with this mirror.

  Further, it corresponds to a general projector projection projected obliquely upward, and uses the optical system using the first and second pair mirrors only on the upper screen on the same side as the tilt direction of the projection optical axis. By combining these, the optical path length was increased to realize adjustment for trapezoidal compensation of the input screen, and a stereoscopic projection apparatus having a compact shielding plate in the space behind the first mirror was realized.

  On the other hand, according to the present invention, a normal horizontal projector screen is provided with a vertical-direction conversion mirror that inputs a vertically aligned three-dimensional screen in which the image is rotated 90 degrees and is laid down, and converts the projected light beam entering from the front to the vertical direction. Subsequently, by adopting a configuration in which the input image light beam from the vertical direction is emitted in the horizontal direction by the right-angle and double-screen separation conversion mirror optical system, the configuration in which the upright stereoscopic image obtained by rotating the image by 90 degrees is projected in the horizontal direction, In addition to this, as a configuration for projecting a mirror inverted erect stereoscopic image rotated 90 degrees forward by adding a fixed or variable angle third mirror that converts the light beam projected and output in the lateral direction forward, It realized that the 3D screen that was laid down was projected as it was without placing the projector itself vertically.

  Of course, the order of the right-angle conversion mirror and the right-angle screen separation / conversion mirror optical system can be interchanged, and the projected light beam entering from the front is horizontally output by the right-angle both-screen separation / conversion mirror. Further, by providing a vertical conversion mirror that converts this output to a right angle in the vertical direction, an upright stereoscopic image of an image rotated by 90 degrees is projected in the vertical direction, or further, this vertical projection output is By setting a fixed or variable angle third mirror that converts to a right angle forward, the mirror-inverted upright stereoscopic image of the image rotated by 90 degrees is projected forward, and the same function as described above Realized.

  Further, the right-angled dual-screen separation / conversion mirror optical system shown above with the optical axis set in the vertical direction is provided with a rotation switching function for rotating it 90 degrees in the horizontal direction, and the horizontal direction The function of projecting an upright stereoscopic image in the forward direction from the function of projecting the mirror-reversed stereoscopic image of the image rotated 90 degrees in the horizontal direction by rotating the mirror optical system 90 degrees in the horizontal direction and directing it forward. The vertical 3D screen input arranged up and down can be easily switched and projected on both an upright screen and a horizontal screen.

  Further, in the present invention, with respect to the projection light beam from the projector, the entire mirror optical system that receives this or the input mirror of the mirror optical system is provided with a function to move or tilt and remove it from the optical path. Realizes a 2D / 3D switching function that switches to direct 2D screen projection, and if necessary, is fixed to the position after the mirror optical system moves or its extension according to the input optical axis plane, and its perspective 2 By constructing a sign plate having a protrusion extending perpendicularly from the optical axis at the end, the projector and the mirror optical system achieve the alignment function, and the stereoscopic image projection of the present invention described so far, The conventional normal two-dimensional screen projection can be easily switched, and the adjustment between the projector and the mirror optical system can be facilitated.

  The distance x from the projector projection lens at both screen separation points P is set to 1 or more, and the distance y from the projector projection lens to the screen is set to 4 or more by the method described in the specification of the present invention. As a result, a 3D image projection device that displays both left and right screens clearly and efficiently has been realized.

  With the realization of the stereoscopic image projection apparatus of the present invention, it is possible to configure a simple and compact stereoscopic system that can obtain a stereoscopic screen that is easy to view with a bright screen by a single projector and no extra images around. In other words, by combining this device or a normal projector with this device as a mirror optical system adapter, stereoscopic viewing of 3D images that could only be done with an expensive dedicated stereoscopic video system consisting of two dedicated projectors in the past, It became possible to enjoy it easily using a normal projector. Moreover, projection-type video display systems, such as home theaters with projectors and projection-type televisions, will become more widely used in the future, but this device can be easily incorporated into these, and 3D video stereoscopic viewing is possible. This is a significant contribution to the spread.

  The best mode for carrying out the present invention will be described below with reference to specific examples. Prior to the description of examples that are typical embodiments, first, examples of the present invention will be described from some basic configurations of the present invention that are basic elements in these examples.

First, FIG. 3 shows a first embodiment of the present invention.
This is an embodiment of the basic configuration of an optical system for obtaining output images respectively separated from left and right from left and right screens (this is a vertical stereoscopic screen) arranged side by side in the present invention. It is shown.
Here, in order to split the projected light beam including the input left and right screens 2 formed by arranging the three-dimensional left and right screens projected from the projection lens 10 vertically in the projector 1 as the light beams of the left and right screens, The screen is divided in half by the side indicated by both screen division points P set according to the side corresponding to the border of the screen, and one side is reflected by the first mirror 33 on the opposite side to the other light beam at a substantially right angle. The right and left screen separation conversion mirror optical system has the function of reflecting and outputting the other light flux in the same direction as the reflected light flux of this one screen by the second mirror 34 set at a fixed distance in the projection direction. The system is configured.
The mirror described in the present invention reflects an image, and therefore does not show only a plane mirror, but a concave mirror, a convex mirror, a free-form surface mirror, etc. in order to obtain effects such as image enlargement, reduction, and correction. Also falls within that scope.

In this optical system, polarization filters having different polarities for each screen are provided beyond the screen splitting point P where the luminous flux is separated in order to construct the separated screens as light images having different polarities. A light filter is installed. Specifically, in FIG. 3, first, the filter 35 is set at the position of the point P for the left screen, and the left screen becomes the filter polar light, while the position of the P point or its position along the optical axis for the right screen. Behind, the position in front of the second mirror 34 set at a fixed distance in the projection direction (possible at the rear position, but in the case of polarized light, the polarity of the filter is reversed because the phase is reversed by mirror reflection. The filter 36 for setting the other polar light is set, and the right screen becomes the filter polar light. As a result, the left and right screens are separated from each other and are composed of lights having different polarities. Note that the polarity of this filter is to separate the two screens; linearly polarized light orthogonal to each other, circularly polarized light with different rotation directions, or red-blue anaglyphs, and light with mutually different passbands. There are filters, etc., and these can be selected and used according to the light used. However, as described above, since the phase of polarized light (especially circularly polarized light) is reversed when it is reflected by the mirror, a filter that is necessary before and after the mirror to obtain the polar light on the final screen. The polarity of is reversed. In addition, since liquid crystal projectors use linearly polarized light for projection light itself, circularly polarized light is required.
Here, either or both of the first and second mirrors are adjusted by providing an angle variable function so that both screens become a three-dimensional screen that coincides with the projection surface 9 (screen surface). Constitute. As a result, a right-and-left double-screen separation conversion mirror optical system is formed that separates the left and right screens projected forward from the projector as light images of different polarities on the left and right, and further superimposes them on the screen. The In addition, the light beam emitted in the right angle direction can be projected to the same front as the original input by passing the light beam through a third mirror that refracts the light beam in the right angle direction. This is the same configuration as that of the optical system projected onto 9b indicated by a dotted line in FIG.
The left and right stereoscopic screens projected on the screen by these optical systems are viewed through the stereoscopic glasses 11 having left and right filters that match the respective polarities, so that the left screen and the right screen are separated from each other by the left and right eyes. It is recognized as a simple screen and stereoscopically viewed. Also in the following embodiments, the left and right screens projected on the screen are stereoscopically viewed through the stereoscopic glasses 11 in a similar manner, and thus description of these glasses is omitted. The screen here is a screen that reflects the phase of polarized light, such as a so-called silver screen.
Furthermore, in the present invention, the side that is in contact with the dividing point P corresponding to the left and right screen boundary line on the projection screen at a position farther from the dividing point P along the projected light beam is an unnecessary portion mixed in each separated screen. On the other hand, shielding plates 37 and 38 having a fixed or variable shielding width are set to shield the screen portion. As will be described in detail later, this shielding plate shields the other screen portions by entering the screen at the corresponding side of each screen from the center boundary line that is the edge of the screen by approximately half the blur width of both screens. Is done. Therefore, if the blur width is small, the shielding portion that bites into the screen is also reduced. Since this corresponds to the part corresponding to the side in contact with the point P in each of the left and right screens, in the case of the configuration of FIG. 3, the position of the shielding plate is located on the outermost side of both screens along the line indicated by the dashed line, In order to reduce the blur width, it is configured to be positioned further along the optical axis after the point P.
In other words, the shielding plate is set at the side divided by the two screen division points P of the screen. In the configuration of FIG. 3, this side is just the outermost side of the luminous flux at the exit position of the projected luminous flux (in FIG. (The uppermost part and the lowermost part corresponding to the outer side), it is easy to take the installation space on the outer side, and it is easy to incorporate these mechanisms such as the movable adjustment function and the expansion / contraction function into the shielding plate.

Here, a detailed description will be given of a method for constructing a stereoscopic image in which the left and right screens according to the present invention are clearly separated and projected from the left and right screens from the vertical stereoscopic screen input screen.
First, in general, when a part of the projector projection light is blocked by the shielding plate, the edge of the projection lens is not clearly blocked by the edge of the shielding plate due to the exit pupil diameter of the projector lens. An area that gradually fades over a certain width at the center is shown. Here, this is the blur area, and the width of the portion where the brightness changes is the blur width. As shown in FIG. 8a, each screen from which the projection light of the projector is separated through the two screen dividing points P has left and right blur areas 13L and 13R with a fixed width indicated by the center boundary C and the hatched area. Each one screen becomes 12L, 12R. Here, the portions 14L and 14R that are outside the bleeding width indicated by the cross diagonal lines of each screen are portions that are shielded and removed from the screen. Since the point P is relatively close to the projection lens 10, the influence of the exit pupil diameter of the lens is large, and the blur width here is increased to some extent.
Next, in order to shield and remove the image portion of the other screen outside the central boundary that causes blurring, set shielding plates 7 and 8 further away from point P to reduce the influence of the exit pupil diameter of the projection lens. To do. As shown in FIG. 8b, the left and right shielding plates 17 and 18 have smaller bleed areas 15L and 15R, so that the bleed widths are just inside the boundary lines so that they lie on the boundary lines. It is set by adjusting the position so that it is almost half the width of the haze, and shields the outer part. As a result, the video portions 16L and 16R on the other screen outside the central boundary C indicated by the cross diagonal lines are shielded and removed.
As a result, as shown in FIG. 8c, unnecessary video portions are removed from the two screens 20L and 20R, and a clear three-dimensional screen 22 with a clear upper and lower boundary is obtained on the combined screen. Since the upper and lower ends of the superimposed stereoscopic screens are each edged by one clear screen, the entire stereoscopic screen is clearly outlined. At this time, the edges of the other screen become blur areas 15L and 15R with reduced brightness at the tip. However, this overlaps with the other screen that is clearly bordered so that the blur is not noticed and becomes almost invisible.
In addition, although the above description is made | formed about the case of the vertical arrangement | sequence stereoscopic screen which arrange | positions both stereoscopic screens up and down, also in the case of the conventional horizontal arrangement | sequence stereoscopic screen which arranges both screens right and left, the screen rotated 90 degrees. Since the operation principle is the same only by the configuration, it is realized in the same way.

Next, these operations will be described in more detail.
First, for both screen separation, a mirror that separates the light beams of the left and right screens is generally used in contact with the projector lens so as to be as close as possible. In this way, if the screen is divided according to the projection light emission position of the projector, regardless of how the screen is divided, each light beam always includes images on both screens. Only the brightness differs in proportion to the size of. This is because light at all points on the projection screen diffuses over the entire exit pupil on the projector lens surface (exit pupil position). The diffused light is concentrated again at one point when it reaches the screen surface. Therefore, when the screen is divided in half, the light from the light source can be used only one-fourth per screen regardless of how the screen is divided. That is, the screen capture efficiency is always 50%.
However, in the present invention, in order to separate the luminous fluxes of the two screens with higher efficiency, the screen division point P is devised to increase the distance from the lens. Focusing on the fact that the projection light leaves the exit pupil when it is far away from the lens surface of the projector, the diffused light is concentrated on one point little by little, and the blur is reduced. By setting them apart only, the entire screen can be divided into two efficiently. In the present invention, this is calculated and the following general formula is derived.
That is, when the separation efficiency improvement magnification for the case where the distance from the projection lens is zero (x = 0; utilization rate 50%) is α, the following relationship is established.
α = (2x + 1) / (x + 1) (1)
Where x is the distance from the lens expressed as a multiple of the lens focal length f,
Further, it is assumed that the projected image diameter is the same as the exit pupil diameter and the screen is sufficiently separated.
This is 1.5 times (total utilization 75%) when x = 1, and 1.67 times (83%) when x = 2.
Therefore, x must be set to at least 1 or more, preferably 2 or more.
Actually, in the case of using a commercially available data projector, the efficiency was improved by α = 1.6 times (total utilization efficiency 80%) when x = 1.5.
In the case of setting the required distance and increasing the light use efficiency according to the present invention, the method of dividing the light beam in the conventional case where the distance is set close to the projection lens is free, whereas the screen boundary line between the projection screens. It is effective and necessary to match the screen branch point P with the same optical axis plane.

Next, regarding the operation of the shielding plate,
Even if the light beams on the left and right screens are efficiently separated as described above, as described above, this greatly increases the amount of light and the screen area (width of the screen) mixed in each screen. Although it is small, it is impossible to avoid all these contaminations.
In the present invention, this is avoided by introducing a newly set shielding plate in the optical system. As described above, even if a shielding object is partially placed in front of the lens, the effect of partially shielding the screen cannot be obtained. For this purpose, it is necessary to separate the shielding plate from the lens. Then, in order to set the effective position of the shielding plate, the following general formula was derived.
That is, the ratio β of the bleeding width with respect to the screen at the distance y from the lens has the following relationship.
β = 1 / (y + 1) (2)
Where y is the distance from the lens expressed as a multiple of the focal length f of the projection lens.
Further, it is assumed that the projected image diameter is the same as the exit pupil diameter and the screen is sufficiently separated.
This is 0.2 (20%) when y = 4 and 0.1 (10%) when y = 9.
That is, the distance y from the lens is preferably at least 4 or more, preferably 9 or more.
In the case of using an actual commercially available data projector, when y = 9, the blur width was suppressed to β = 0.1 (10%).
Since this shielding plate shields the boundary of the projected screen a little within the normal screen (only half of the bleeding width), the optimal amount of entry, that is, the unnecessary screen part is shielded and the screen used. In order to adjust the amount that the part does not shield extra, adjust the shield area to be variable in the direction perpendicular to the projected light beam by moving the plate up and down with the arm or rotating the plate in the direction perpendicular to the optical axis. It is effective to make it possible.
Furthermore, since it is desirable that the shielding plate be as far as possible from the projector lens in order to reduce the blur width, it is effective to set this position by extending the arm in the projection direction. When they are not needed, they can be stored short by folding the arm or expanding and contracting.
The apparatus according to the present invention comprises a projector part for projecting a stereoscopic screen and a mirror optical system part for separately projecting both stereoscopic screens thereafter. Therefore, the present invention can be realized not only as a combination of a projector and this mirror optical system, but also by mounting the mirror optical system portion of the present invention as an adapter on a general projector. This is common to all cases of the present invention described later.

Next, FIG. 4 shows a second embodiment of the present invention.
This is a right-angled double-screen separation / conversion mirror optical system having a configuration suitable for use in combination with a conventional general projector, and is considered to have a high possibility of being used in actual applications.
Here, the projection light beam input from the projector lens 10 is divided into two at the screen splitting point P at the far end of the first mirror 43, and one of the projection light beams intersects with the other light beam by the first mirror 43 and the outside. The other light beam is reflected in the same direction as the reflected light beam by the second mirror 44 set at a distance d farther from the first mirror along the optical axis. Here again, as in the case of FIG. 3, the first and second mirrors are adjusted by providing one or both of them with a variable angle function so that both screens coincide with each other on the screen of the projection plane 9. Configure. As a result, as in FIG. 3, the input left and right screens 2 are mirror-inverted in the perpendicular direction and converted into independent left and right screens. A screen separation conversion mirror optical system is constructed. In this case, both screen division points P are at the back of the first mirror 43 on the near side and always have a certain distance from the projection lens 10, which is advantageous in terms of separation efficiency. The optical filter is set further than the dividing point P. Therefore, as shown in FIG. 4, one filter 45 can be set outside the other light beam after the first mirror 43, and the other can be configured as a filter 46 inside the second mirror 44. Alternatively, it can be set at a position further rearward of the mirror 44 as indicated by the filter 46a. In addition, the fixed or variable shielding plates 47 and 48 that shield unnecessary portions in the boundary area between the two screens correspond to the sides indicated by the alternate long and short dash lines in the figure in contact with the point P on the screen, Although it is set at a position farther than the screen dividing point P on the side, this space can be secured as much as necessary by setting the distance d between the first and second mirrors.
As described in FIG. 3, the shielding plate is set as far as possible from the input in order to reduce the blur width. In the case of FIG. Since the screens overlap, it is not possible to set a shielding plate farther than the point Q where the two screens overlap, and the space that can be set is limited. Note that the position of this point Q can be located farther by increasing the distance d between the first and second mirrors.
Similarly to the case of FIG. 3, the optical system of FIG. 4 also passes through the third mirror that reflects the right and left screen light beams projected in the right angle direction in the right angle direction. Can project in the same forward direction.

As described above, in the right-angle both-screen separation / conversion mirror optical system having the configuration shown in FIG. 4, since the shielding plate has a constraint, the structure and set position of the shielding plate of the present invention will be described with reference to FIG.
First, FIG. 2a shows that the light flux is almost vertical from the side passing through the screen split point P corresponding to the boundary line between the input left and right screens indicated by the alternate long and short dash line at the position up to the point Q where the both screens overlap each other for each separated screen. The shielding plates 27a and 28a for shielding are set. In the figure, the shielding plate is indicated by a line segment of the cross section, but actually, it is configured in a plate shape in a direction perpendicular to the drawing.
In addition, this shielding plate can be adjusted by freely changing the amount of shielding by changing the height of entering the screen from the side by adopting a variable expansion and contraction structure as indicated by an arrow as required.
Further, FIG. 2b is also shown in the embodiment of FIG. 4, but instead of the variable length plate as the shielding plate, the plates 27b and 28b having a certain width are rotated, and the screen shielding amount is determined by the rotation angle. It is to realize the adjustment.
On the other hand, in the example of FIG. 2c, the side E of the reflection output of the first mirror 23c indicated by the alternate long and short dash line on the shielding plate is an area where the light beams of the left and right screens overlap, and the second mirror 24c. The configuration of the shielding plate 27c is shown in which the screen F can be adjusted for both screens with a single shielding plate by setting the side F on the screen separation point side of the reflection input to the area surrounded by the intersection point G.
Here, between the first and second mirrors 23c and 24c, the shielding plate 27c that is rotatable and variable in height is projected around the intersection G or the shielding plate center point v set outside thereof. It is something to be made. In the area where the light fluxes on both the left and right screens overlap, the left and right screens can be covered with a single shielding plate by specifying the amount of shielding to each of the left and right screens when the angle and height of this shielding plate are changed. It is possible to freely set the amount of shielding.
In addition, the distance between the first and second mirrors 23c and 24c may in principle be zero, but in practice, as shown in the figure in the meantime, a rotatable shielding plate having a certain size. In order to set 27c, a small interval Δw in the lateral direction may be provided in the same manner as the small interval Δd in the depth direction. If this interval is sufficiently smaller than the exit pupil diameter of the projector, the image light is dispersed, so that the separation efficiency of the incident light beam is only slightly reduced, and a function for separating both screens is obtained which is almost the same as when there is no Δw. It is done. This also applies to all the cases of the dual screen separation conversion mirror optical system having the shape shown in FIG. 2a, 2b or FIG.
On the other hand, in the case of the configuration of FIG. 3, the shielding plate corresponds to the outermost side of the output divided both screens, so it is easy to take a space for setting the shielding plate. However, in the case of the configuration of FIG. The sides to be branched will correspond to the inside of each divided screen, and the space for setting the shielding plate is limited, so as described above, it is necessary to devise a configuration for the shielding plate. On the contrary, there is an advantage that the shielding plate can be compactly incorporated as a whole.

FIG. 1 shows a third embodiment of the present invention.
This is basically done by using the right-angle both-screen separation conversion mirror optical system shown in FIG. 4 and returning the output to the front direction even if it is reflected by the third mirror 19 at a right angle. An upright stereoscopic image is projected.
That is, the projected light beams of the left and right screens 2 projected from the projection lens 10 in the projector 1 are transferred to one screen R from the screen splitting point P by the right-angled screen splitting conversion mirror optical system 29 in FIG. The light beam is guided to the first mirror 3 and further projected onto the third mirror 19 through the filter 5 having the R screen polarity. On the other hand, the light flux of the other screen L is guided to the second mirror 4 set back from the first mirror by the distance d, and further passed to the third mirror 19 through the L screen filter 6 of different polarity. Projected. At this time, the filter 6 can be set in front of the mirror 4 as a filter 6a indicated by a dotted line, but in this case, the phase of the light changes 180 degrees due to reflection by the mirror 4, and the phase is reversed. In the case of circularly polarized light, it becomes a filter with a reverse rotation phase. Furthermore, after passing through the filter, if the light passes through the mirror optical system, the phase of the light is disturbed when reflected by the mirror. Therefore, it is desirable that the number of stages of the mirror optical system after the filter be as small as possible. . As a result, the RL screens of lights of different polarities projected on the third mirror are finally projected on the screen 9 as a three-dimensional screen that overlaps right and left.
At this time, each of the first and second mirrors is adjusted so that both screens overlap each other on the screen 9 by providing either or both of them with a variable angle function. Further, the third mirror 19 can also be set by changing the projection position on the screen 9 by providing an angle variable function.
In addition, the left and right screens divided by the both-screen separation-conversion mirror optical system are spaces created by setting the first and second mirrors 3 and 4 apart by a distance d. Shielding plates 7 and 8 that shield the screen edges that pass through the screen dividing point P indicated by the alternate long and short dash line are set in front of the screen and in an area that is not affected by the luminous flux of both screens. It has a function to do. In this figure, an example of adjusting the shielding amount by rotating the shielding plate is shown, but of course other than this, the shielding amount can also be adjusted by a method such as expanding and contracting the shielding plate as described above. There is no need to explain what you can do.
Here, even if the configuration of FIG. 3 is introduced instead of the configuration of FIG. 4 as the right-and-left double screen separation conversion mirror, naturally the same operation function can be obtained. Of course, in this case, since the position of the shielding plate is the outermost side of the output projection screen, which is a function due to the difference in configuration between the two, the setting of the shielding plate is easy, and the screen passing through one rear mirror 34 Since the optical path length of the R screen (in this case) is longer than the screen passing through the other front mirror 33 (in this case, the L screen), it is necessary to consider the correction with the projection distance. This is because the separation conversion mirror 79 indicated by the dotted line in the embodiment of FIG. 7 described later is combined with the mirror 71 and projected onto the front screen 9b, and the order of combination is simply reversed. And the same thing.

FIG. 9 shows a fourth embodiment of the present invention.
In general, many projectors have a configuration in which the projection optical axis is directed obliquely upward rather than in the front, but the present invention is particularly effective for such a configuration. In this case, the upper screen on the same side as the tilt direction of the projection optical axis is set as one screen, and the first mirror 93 is used as a both-screen separation conversion mirror optical system that bisects the projected light flux of the input left and right screens. An optical system in which the light is split at a splitting point P by this mirror and reflected upward at a substantially right angle, is emitted to the side opposite to the light flux on the other screen, and is projected forward by a second mirror 94. The three-dimensional image projector is used. Here, each of the first and second mirrors is provided with a variable angle function in one or both, so that one screen is adjusted on the screen 9 so as to overlap the other screen. The other light beam is projected as it is. However, it is also possible to use the first and second mirrors in the same way, projecting them downward and projecting them forward. However, in this case, the optical path lengths of the upper and lower screen light beams work in such a direction that the difference decreases.
In these configurations, the setting positions of the optical filters 95 and 96 are at the position of the dividing point P or behind it. Specifically, with respect to the filter 96 on one screen which is an optical system having a mirror, a filter 96a indicated by a dotted line in front of the first mirror 93, or conversely, the second mirror 94 at the rear. May be set to the filter 96b shown in the same manner. Of course, in this case as well, the area of the filter increases as it comes after the mirror, but the disturbance of the polarity of light decreases.
In addition, the shielding plates 97 and 98 that block the blur at the boundary portion between the left and right screens are the inner sides of both screens where the sides corresponding to the screen splitting points P for setting the screens are separated, and the setting positions are divided. Since it is between the two screens, the installation of the shielding plate can be gathered at the center of the projection surface and can be made compact.
Further, in this case, since the light flux of one screen is reflected by the first mirror 93, a space where the light flux is blocked is formed in front of the first mirror 93, whereby the distance to the point Q where the two screens intersect and the resulting space Expansion can be realized. Further, in this case, the side passing through the dividing point P that is the side to be shielded with respect to the separated left and right screens is exactly the outside position adjacent to this space, as indicated by the alternate long and short dash line in the figure. Therefore, the shielding plates 97 and 98 can use this wide space to form a compact shielding plate in this space.
Furthermore, as described above, when the screen is projected from the projector onto the screen with an obliquely upward projection optical axis, the distance to the screen increases as the screen is projected upward, so-called trapezoidal distortion is widened, and correction is made for this. Normally, trapezoidal compression distortion correction is performed to compress the image larger toward the top of the screen. Therefore, in this state, it is assumed that the projector is simply projected in the horizontal direction as in the optical system in the examples of FIGS. 10 and 11, which will be described later, and the distance from the upper and lower screens to the screen. In the case of a conventional optical system having the same or small difference, if the previous keystone correction is performed on the entire projection screen as it is, the upper screen naturally becomes excessively compressed and the upper screen is excessively compressed. Will be smaller on the screen than the lower screen. For this reason, in the present invention, as shown in FIG. 9, a configuration is adopted in which a both-screen separation conversion mirror optical system is set for the upper screen, whereby the optical path length of the upper screen is corrected, and the mirror optical systems 93 and 94 are provided. By setting the length to be longer by the amount of time (the distance can be changed by changing the distance between the mirrors 93 and 94), the upper projection screen is further enlarged. As a result, an effect of canceling the trapezoidal compression correction applied more on the upper screen side in the input screen is obtained, and a balanced keystone correction can be realized on the upper and lower screens. This indicates that the same trapezoidal compression correction can be used in common with a normal projection screen that does not divide the screen for stereoscopic display, and the degree of these keystone corrections must be readjusted when switching between the two projections. It has the advantage that can be realized without.

Of course, the configuration in which the shielding plates of the present invention are combined is generally applicable as it is even in the configuration in which the conventional both-screen division is used for only one screen.
That is, FIG. 10 shows an explanatory diagram of a configuration example of the present invention in a configuration having a mirror optical system only on one conventional screen.
This is because when the projector projects the screen obliquely upward, the light flux on one lower screen intersects the light flux on the other upper screen by the first mirror 103 without performing the trapezoidal correction of the screen described above. By using an optical system that projects it to the outside (here, the upper side) and projects it forward by the second mirror 104, the optical path length of the lower screen is increased to match the optical path lengths of both projected screens. Thus, the correction is made so that the sizes of both projected screens are matched. Accordingly, in this case, if the normal keystone correction of the screen is performed, the screen is distorted. Here, with the introduction of the shielding plate of the present invention, the shielding plates 107 and 108 for suppressing the blurring at the boundary line between the left and right screens are set at the positions of the sides corresponding to the outermost sides of both screens as in the case of FIG. It is configured to do.
That is, in this case, the side that touches both screen dividing points P in the left and right screens separated is the outermost side of both screens as shown by the dashed line in FIG. It becomes composition. In this configuration, the shielding plate is on the outermost side of the optical system, so that in this case as well, the position and space can be freely set.
FIG. 11 shows an explanatory diagram of a configuration example of the present invention in another configuration having a mirror optical system on only one conventional screen. In this case, when projecting obliquely upward, the optical system of the first mirror 113 and the second mirror 114 is introduced to the lower screen side so that the optical path length of the lower screen is lengthened to match the other. However, in this case as well, the trapezoidal correction of the screen is not assumed. In this case, the shielding plates 117 and 118 are arranged so that the sides passing through both screen dividing points P are respectively shown in the dashed line in FIG. Since it corresponds to the inner side, as in the case of FIG.
In these drawings, the description of the filter is omitted because its function is the same as in the previous description.

Next, FIG. 5 shows a fifth embodiment of the present invention. First, FIG. 5a will be described.
This is a combination of a vertical direction conversion mirror 51 and a right and left screen separation conversion mirror optical system that emits the image light beam shown in FIG. 3 or FIG. Is. That is, the input screen projected from the projector 1 to the front is first reflected vertically upward by the vertical direction conversion mirror, and then this is shown in FIG. 5 as an example corresponding to FIG. A three-dimensional image in which the image projected from the front is projected in the horizontal direction as a left-right independent screen of an upright image rotated 90 degrees by passing through a right-angled two-screen separation conversion mirror optical system composed of the mirror 54 Construct a projection device. In the separation conversion mirror optical system in this optical system, each mirror has a variable angle, and the position of the left and right independent screens can be adjusted so that they are superimposed on the screen projection surface. Although not shown for ease of explanation, this optical system is also provided with an optical filter and a shielding plate corresponding to each screen in the same manner as in FIG. As with the original case, unnecessary portions are shielded from the plate.
This embodiment is particularly suitable for a case where a three-dimensional screen having a configuration in which a horizontally long screen is vertically divided into two vertically and a horizontally long so-called half-size left and right screen is arranged here is projected by a projector having a normal horizontally long screen layout. Yes. That is, in this embodiment, by projecting and inputting this vertically long vertical stereoscopic screen to the present apparatus as a horizontally long screen in the form of being laid down, it can be output and projected as an upright stereoscopic screen with the screen rotated 90 degrees.
FIG. 5b shows a configuration that makes this easier to use. Here, a stereoscopic image projection device that projects an upright image rotated 90 degrees forward by adding a third mirror 52 that reflects the lateral projection light beam at a right angle and converts it forward is added to the optical system of FIG. 5a. Constitute.
With this configuration, the projection output that has been output in the horizontal direction is projected to the front front. However, in this case, since the output screen is a mirror inversion screen with respect to the input, it is necessary to put a mirror inverted image in the input. In general, in projectors that are assumed to project obliquely upward, it is common to perform keystone correction on the input screen on a normal two-dimensional screen. Trapezoidal correction is required in the direction perpendicular to. Therefore, by adding the trapezoidal correction in the right-angle direction in advance to the stereoscopic input screen or by setting the correction condition of the projector, the mutual switching between the two-dimensional projection and the stereoscopic projection can be easily performed as it is. It becomes possible to do. This is particularly effective in the 2D / 3D screen switching configuration of the present invention described later.
Further, here, the shielding plate that is outside the second mirror output in the separation conversion mirror optical system can be located as it is, but this may be far from the second mirror, and further outside the third mirror. It can also be set by parallel movement.

FIG. 6 shows a sixth embodiment of the present invention. That is, in the configuration shown in FIG. 5, the vertical direction conversion mirror and the two screen separation conversion mirrors connected to the vertical direction conversion mirror need to be included in the optical system. Therefore, FIG. 6 shows an implementation method in which this order is reversed and a perpendicular direction conversion mirror is first placed on the projection input, and then a vertical direction conversion mirror is placed.
That is, first, in FIG. 6a, the optical axis is converted in the horizontal direction by the right-angle conversion mirror optical system shown in FIG. 3 or FIG. 4, but this figure shows the case where the optical system of FIG. Right-angle conversion mirrors 63 and 64 corresponding to 33 and 34 are introduced. Furthermore, by passing this through a vertical direction conversion mirror 61 that converts it 90 degrees vertically, a stereoscopic image projection apparatus that projects an upright image in which the image is rotated 90 degrees in the same manner as before is now constructed. To do.
In FIG. 6b, similarly to the case of FIG. 5b, by setting a third mirror 62 that converts the output to the right angle further forward to the output of the optical system of FIG. A stereoscopic image projection apparatus that projects an erect image forward is realized.
Also in FIG. 6, although not shown in the figure for the sake of simplification of explanation, this right-and-left double screen separation conversion mirror optical system also includes an optical filter and a shielding plate for each screen as in FIG. In this case as well, the position of the shielding plate can be set as it is after the separation conversion optical system mirrors 63 and 64, after the vertical direction conversion mirror 61, and further after the third mirror 62. .

Next, FIG. 7 shows a seventh embodiment of the present invention.
In the optical system of the apparatus shown in FIG. 5, the horizontal-direction double-screen separation / conversion mirror optical system 79 in which the optical axis is the vertical direction is horizontal with respect to the optical axis S as indicated by the circular arc arrow in the figure. It has a rotation switching function that rotates 90 degrees in the direction. With respect to the conversion mirror 79, the mirrors 73a and 74a in the solid line direction that are directed in the horizontal direction are rotated 90 degrees in the horizontal direction and directed forward to be in the state indicated by the dotted line (73b and 74b). As a result, the input image 70 projected from the front is reflected perpendicularly by the vertical direction conversion mirror 71 and proceeds in the vertical direction, and in the state of the solid line, the input screen is rotated 90 degrees and output projected (9a) in the horizontal direction. This time, the projection direction is rotated 90 degrees and becomes a dotted line, so that it reflects in the same forward direction as if reflected at right angles, and as a result, an upright image without rotation or inversion is projected forward as a projection output Will have the function.
By adopting a configuration with this switching function added, this separation conversion mirror optical function is used to project the horizontally laid vertical and vertical 3D input screen 70a realized in the configuration of FIG. 5 as an upright left and right 3D screen 9a. By rotating the system 90 degrees and switching the projection direction of the mirror to the front, it is possible to project the upright vertical 3D input screen 70b as an upright left and right 3D screen 9b with the same device It is. That is, a highly versatile stereoscopic image projection apparatus that can switch between a vertical stereoscopic input screen in an upright configuration or a horizontal configuration has been realized.
In particular, in the case of the configuration in which the erect image of FIG. 5b is projected forward, when introducing the rotation of the right-and-left double-screen separation conversion mirror optical system, the output image for the erect vertical stereoscopic input is Because it can project directly from this conversion mirror without going through the third mirror 52 from the horizontal direction in the figure and can project an erect image on the same front surface, it is very easy to use and highly versatile. The projection apparatus is realized. Although the description is omitted in FIG. 7, the right-angle double screen separation conversion mirror optical system here also includes an optical filter and a shielding plate and functions.

FIG. 12 shows an eighth embodiment of the present invention.
In the explanation given above, the switching method of the optical system in the operation of rotating the stereoscopic image to be projected by 90 degrees has been explained. However, on the other hand, in actual use, a stereoscopic view screen (3D screen) is obtained by connecting the adapter portion of the present invention to the projection of a two-dimensional flat screen (here, 2D screen) normally performed by a projector. It is also required as an important factor that the switching operation to switch to the projection of Furthermore, at this time, it is also necessary that the optical axis of the adapter of the present invention can be easily aligned with the optical axis of the projected light beam of the projector.
For this reason, in FIG. 12a, the adapter A1 is projected by the projector 1 by moving the entire adapter portion vertically and horizontally (in this case, by moving w in the horizontal direction) perpendicular to the projection optical axis X1 of the projector. The projector is removed from the optical system, and the projector light beam is projected onto the screen 9 as it is as a normal 2D screen.
Further, in the present invention, in order to facilitate the optical axis adjustment between the projector and the adapter, the adapter is moved and removed for 2D screen projection, and the input window N1 is directly connected to the adapter at the position where the input window N1 is located. Marks T1a and T1b whose cutting lines are set on a plane (incident optical axis plane) including the incident optical axis of the adapter indicated by a thick line J1 are introduced. Therefore, the side corresponding to both screen division points P of the adapter is included in this plane. Since this sign is in the plane of the incident optical axis of this adapter, when it is projected onto the screen by the projector, the position and angle of adapter A1 change as shown by the arrow shown near T1b in the figure. When this incident optical axis plane coincides with the optical axis plane of the projector, it appears as a single horizontal line on the screen as shown in this figure. As a result, the screen projection optical axis and the incident optical axis plane of the adapter can be matched.
In this figure, the sign is composed of two plates T1a and T1b, but the whole may be a single plate. Also, at this time, as shown in the figure, for the sign plate, linear pillars C1a and C1b perpendicular to the sign plate indicating the center of the optical axis at the center of two perspectives along the optical axis, By providing marks H1a and H1b that indicate the edges of the screen, such as protrusions that are pointed toward the side, the center line C1a and C1b are positioned on the projection screen so that they are aligned with the center. Adjust the angle to align the adapter optical axis with the optical axis of the adapter in the left-right direction, and further adjust the adapter so that the images of the end marks H1a and H1b are aligned on both ends on the projection screen or within the screen. The angle of view of the adapter can be adjusted to the angle of view of the projector by moving it back and forth. Note that C1a and C1b indicating the center of the optical axis are not necessarily vertical lines, and may be protruding marks similar to the end marks H1a and H1b, and the protruding marks may be provided in both the upper and lower directions. In addition, the sign can be removed from the projection optical system by being folded or removed to the adapter side during 2D projection. As a result, when this 2D screen projection is required, this sign is used, so that the adapter position, height and light can be adjusted so that the adapter optical axis plane indicated by this sign is aligned with the center optical axis of the projector projection light beam. A function to adjust and set the tilt angle of the shaft can be realized.
By performing this adjustment, when the horizontally moved adapter returns to the original position for 3D screen projection, the optical axis at the center of the projector beam always passes through the point P so that it matches the optical axis of the adapter. Therefore, the optical axis adjustment of the adapter can be realized very easily.

In the above description, the case where this switching moves the entire adapter has been described, but it is also possible to switch only a part of the mirror of the adapter optical system. That is, the mirror part which first reflects the light beam projected from the projector at a right angle, the pair of mirrors of the first and second mirrors in FIGS. 1, 4 and 6, and further FIG. 5 or FIG. It is possible to easily switch to direct projection onto a 2D screen by removing the projection beam from the projected light beam by moving or tilting the vertical direction conversion mirror part of the single lens in FIG. 5 and projecting the light beam from the projector as it is.
Specifically, in FIG. 12b, in the adapter A2 (not shown except for the mirror M) having the single-direction vertical conversion mirror M indicated by the dotted line, the mirror M is tilted to the position of Mb. The light beam entering the adapter A2 from the light entrance window N2 from the projector 1 travels straight and is directly projected on the screen 9 as a normal 2D screen through the light exit window S2. Here, a plate-like plate fixed to the adapter A2 and set at a position after the mirror M on the extension of the horizontal axis of the incident optical axis of the adapter indicated by a thick line J2 as a cutting line on the side surface of the adapter. Has a sign T2. Next, when the light beam from the projector 1 is projected through the sign T2, the position and angle of the adapter A2 is changed as indicated by an arrow near T2, thereby changing the plane of the sign T2 to the optical axis plane of the projection optical axis X2. Accordingly, the shadow of the sign projected on the screen is adjusted so as to appear almost linear in the center. This makes it easy to match the incident optical axis of the adapter with the projection optical axis of the projector. Of course, in this case as well, the linear columns C2a and C2b indicating the center of the optical axis for aligning the optical axis and the both ends of the screen are aligned with the same position after tilting or moving the mirror as in the case of the entire movement. By configuring the function of setting the mark marks H2a and H2b to be shown before and after the mark, the alignment of the optical axis and the angle of view of the projector and the adapter can be performed. Also in this case, the sign T2 is removed from the projection optical axis by folding or removing during normal 2D screen projection.
In the above description of the signs, the case where the three-dimensional left and right screens are arranged vertically is explained as an example. However, the three-dimensional screen arranged vertically as shown in FIGS. Even when lying down, it can be handled in the same way. In this case, since the position of the input screen is rotated 90 degrees, the correspondence is reversed, the adjustment of the separation boundary line between the three-dimensional screens is made by overlapping the central vertical lines, and the center position of the screen is made straight by overlapping the sign boards. It is adjusted with.
In general, since the projection light of the projector is very bright, it is dangerous to look directly into the projection light for adjusting the optical axis of the adapter, and the image switching configuration with the sign of this method should be used. Therefore, it is possible to switch images safely and align the optical axis of the adapter without having to look into it.

Up to now, the left and right stereoscopic screens have been mainly described with respect to the vertical and vertical arrangement stereoscopic screens. However, the present invention is naturally applicable to a normal left and right horizontal arrangement stereoscopic screen as it is.
In other words, the difference between the compatible screens is the difference between the vertically aligned screen and the horizontally aligned screen, but the composition of the screen is only 90 degrees rotated, so the optical system that accompanies this is also rotated 90 degrees in principle. This is handled by adopting the arrangement configuration. Specifically, in the case of FIGS. 1 and 9, by rotating the optical system 90 degrees and setting it to the horizontal direction, an output of the left and right separation independent screen can be obtained with respect to the horizontal array screen input. 3 and 4 are also arranged horizontally by setting these optical systems to be horizontal, projecting the input in the front horizontal direction, and outputting the projected output sideways. A left and right separation output screen is obtained for a stereoscopic screen input. This is the same as the configuration of the separation conversion mirror in FIG. Further, since the output becomes a mirror inverted image by passing through the mirror, similarly, the conversion mirror 61 of the output unit in the configuration of FIG. 6 is reflected at right angles to the forward direction which does not cause the rotation of the screen in the vertical direction. By making it equivalent to the configuration shown by the dotted line in FIG. 7, it is possible to configure the projection output of the erecting non-inverted left / right separated independent screen on the front.

Although the present stereoscopic image projection apparatus has been described mainly focusing on the front projection format, the present invention is not limited to this. In particular, the present invention has many common features for a rear projection type projection display method represented by a rear projection type television, and a combination utilizing these features can be realized.
The rear projection type projector is originally equipped with one image projection function, and many reflection optical systems using mirrors have been introduced to reduce the thickness of the rear side. In contrast, the stereoscopic video apparatus of the present invention can be realized with a single image projection function, and its optical system is composed of a mirror optical system having a small and simple structure. In itself, the rear projection projector can be made into a three-dimensional image and made compact. Further, mirror optical systems that are basic and frequently used in both apparatuses, such as when the optical axis reflection mirror in the rear projection apparatus and the right angle reflection mirror in the present invention are shared by one mirror, etc. High performance and downsizing can be realized by sharing the same.
As for the polarized light used in the stereoscopic image device of the present invention, the screen used in the normal front projection type requires a silver screen with a metal reflecting surface in order to reflect the polarized light satisfactorily. Since polarized light is transmitted, a special screen can be used without necessity. In this respect as well, the device of the present invention is well adapted to this method.
As described above, particularly for a rear projection type projector, by incorporating the apparatus of the present invention, a high-performance and compact stereoscopic projection apparatus can be realized by a synergistic effect in which the features are sufficiently combined.

Third embodiment of the present invention The figure explaining this invention shielding board First embodiment of the present invention Second embodiment of the present invention Fifth embodiment of the present invention Sixth embodiment of the present invention Seventh embodiment of the present invention Explanatory drawing about the stereo image structure method of this invention Fourth embodiment of the present invention Explanatory drawing of one-side screen mirror optical system of the present invention Explanatory drawing of another one-side mirror optical system of the present invention Eighth embodiment of the present invention

Explanation of symbols

1.Projector
2, Input left and right screen
3, 23, 23c, 33, 43, 53, 63, 73a, 73b, 93, 103, 113 First mirror
4, 24, 24c, 34, 44, 54, 64, 74a, 74b, 94, 104, 114 Second mirror
5, 6, 6a, 25, 26, 35, 36, 45, 46, 46a, 95, 96, 96a, 96b Optical filter
7, 8, 27, 27a, 27b, 27c, 28, 28a, 28b, 37, 38, shielding plate
9, 9a, 9b, projection plane
10, Projector projection lens
11. Stereoscopic left and right glasses
12L, 12R, one screen
13L, 13R, 15L, 15R, bleeding area
14L, 14R, 16L, 16R, part to be shielded
17, 18, Shield plate
19, 52, 62, third mirror
20L, 20R, left and right screen
22, 3D screen
29, 79, right-angle dual screen separation conversion mirror
47, 48, 97, 98, 107, 108, 117, 118, shielding plate
51, 61, 71, vertical conversion mirror
70, 70a, 70b, input screen
A1, A2 Stereoscopic projection adapter c Center border
C1a, C1b, C2a, C2b Marking plate central linear column d Distance between mirrors Δd Depth mirror distance
E Side of the split output side of the reflection output
F Side of split screen side of reflection input
G intersection
H1a, H1b, H2a, H2b
J1, J2 Input optical axis plane cutting line
M, Mb direction change mirror
N1, N2 input window
P Screen split point
Q The overlapping point of both screens s Optical axis
S2 output window
T1a, T1b, T2 Marking plate v Shield plate center point w Travel distance Δw Horizontal mirror spacing
X1, X2 Projection optical axis

Claims (11)

  A projector that projects a three-dimensional screen (vertical three-dimensional screen) composed of three-dimensional left and right screens arranged vertically, and this projected luminous flux is divided into two screens at a screen split point P corresponding to the boundary line between the two screens to form split screens. In the configuration including the both-screen separation / conversion mirror optical system having a function of superimposing and projecting these on the screen as light beams of different polarities that pass through the filters, A three-dimensional image projection apparatus having a fixed or variable length shielding plate that is set to enter a half of a bleeding width from a central boundary line of a screen on a side that touches the screen, and shields an unnecessary portion of the screen.   The projected light beam of the vertical stereoscopic screen is divided into two at the screen dividing point P corresponding to the boundary line between the two screens, and one of the light beams is emitted at a substantially right angle to the opposite side of the other light beam by the first mirror. Separates both screens as a fixed or variable angle right-and-left double-screen separation conversion mirror optical system having a configuration in which the reflected light is reflected in substantially the same direction by a second mirror set at a fixed distance from the first mirror. The conversion mirror optical system is configured so that the side bordering the screen splitting point P of the screen is set to enter only half of the bleeding width from the center border of the screen, and is fixed or variable length that shields unnecessary portions of the screen. 2. The three-dimensional image projector according to claim 1, wherein a shielding plate is provided on the outermost side of both divided screens.   The projected light flux of the vertical stereoscopic screen is divided into two at the screen splitting point P corresponding to the boundary line between the two screens, one of which intersects with the other light flux by the first mirror and exits to the outside. Both-screen separation / conversion mirror optics as a fixed or variable-angle right-angle two-screen separation / conversion mirror each having a configuration in which the reflected light beam is reflected in substantially the same direction by a second mirror set at a fixed distance from the first mirror. A fixed or variable-length shielding plate that shields unnecessary portions of the screen that is set by entering only half of the bleeding width from the center boundary of the screen at the side that touches both screen division points P. 2. The stereoscopic video apparatus according to claim 1, wherein the three-dimensional video apparatus is provided on each inner side of both divided screens.   Set up a single shielding plate that is installed between the first and second mirrors, and the height and angle of the projection that protrudes between the mirrors, and the amount of this angle and height component to the left and right screens. The three-dimensional image projector according to claim 3, wherein the amount of shielding to both the left and right screens is set by a single shielding plate.   By projecting the projected light beam entering from the front in the vertical direction by the right-angle double-screen separation conversion mirror optical system, and further setting a third mirror with a fixed or variable angle that converts this vertical projection output to the front at a right angle. 4. The stereoscopic video projector according to claim 2, wherein a vertical stereoscopic image is projected forward.   For the projector projected light beam projected obliquely upward, the upper screen on the same side as the tilt direction of the projection optical axis is used as one screen, and this light beam is divided at both screen dividing points P by a fixed or variable angle first mirror. Then, it is reflected upward and projected to the opposite side of the other screen, and this is projected onto the front by a fixed or variable angle second mirror, and the other light beam is projected as it is, and both screens are separated and converted. The mirror optical system is configured so that the shielding plate is provided on the inner side of each separated screen and in the space in front of the first mirror, and the optical path is changed by changing the distance between the first and second mirrors. The stereoscopic projection apparatus according to claim 1, wherein the length can be changed.   By having a right-angle conversion mirror that converts the projected light beam entering from the front to the vertical direction, followed by a configuration that emits the input image light beam from the vertical direction in the horizontal direction by the right-angle and double-screen separation conversion mirror optical system, A configuration in which an upright stereoscopic image obtained by rotating an image by 90 degrees is projected in the lateral direction, or a third mirror having a fixed or variable angle for converting the luminous flux projected and output in the lateral direction to the front is further added. The stereoscopic image projection device according to claim 2, wherein the three-dimensional image projection device is configured to project a mirror-inverted erect stereoscopic image rotated 90 degrees forward.   An upright three-dimensional image of an image rotated by 90 degrees by providing a vertical direction conversion mirror that emits a projected light beam entering from the front in a horizontal direction by a right-and-left double-screen separation conversion mirror and further converts this output to a right angle in the vertical direction. In which the image is projected in the vertical direction, or in addition, by setting a fixed or variable angle third mirror that converts this vertical projection output forward to a right angle, the mirror inversion upright of the image rotated 90 degrees The stereoscopic video projection apparatus according to claim 2, wherein a stereoscopic image is projected forward.   The perpendicular-direction dual-screen separation / conversion mirror optical system shown in claims 2 to 3 in which the optical axis is set in the vertical direction is provided with a rotation switching function for rotating it 90 degrees in the horizontal direction, and in the horizontal direction. By rotating the mirror optical system that is directed 90 degrees in the horizontal direction and turning it forward, the function of projecting a mirror-reflected stereoscopic image of the image rotated 90 degrees in the horizontal direction can be used to generate an erect stereoscopic image in the forward direction. The stereoscopic image projection apparatus according to claim 5, wherein the stereoscopic image projection apparatus is switched to a function to project.   2D / 3D for switching to direct 2D screen projection from the projector by providing a function to move or tilt the entire mirror optical system that receives the light flux from the projector or the input mirror of the mirror optical system to remove it from the optical path. A projection that realizes the switching function and is fixed to the input optical axis plane on the position after the mirror optical system moves or its extension as necessary, and extends perpendicularly from the optical axis to the two near ends The stereoscopic image projector according to any one of claims 1 to 9, wherein an alignment function between the projector and the mirror optical system is realized by configuring a sign board provided with the above. 11. The distance x from the projector projection lens of both screen separation points P is set to 1 or more, and the distance y from the projector projection lens of the shielding plate is set to 4 or more. 3D image projector.

Images