JPH07333557A - Image projection device - Google Patents

Abstract

PURPOSE:To provide an image projection device which makes it possible to enjoy, in a simple way even by a number of persons, a large image and a stereoscopic image with presence even in a small room. CONSTITUTION:The image projection device 1 is constituted of a liquid crystal video projector 10 and an adapter 20. A projected beam from a projection lens 16 in the liquid crystal video projector 10 is bisected to left/right by a beam splitter 24 in the adapter 20. A transmission beam through the beam splitter 24 whose polarization direction is rotated by 90 deg. when passing through a 1/2 wavelength plate 25, and becomes a horizontal linear polarization to form an image on a screen. Further, a vertical linear polarization being a reflection beam by the beam splitter 24 forms image on the screen by a total reflection plane mirror 27. When virtual images 7, 8 with an image formation deviation (distance D) are viewed using polarizing glasses 50 matched with polarization directions, the screen disappears, and a video 9 with presence is enjoyed simply behind the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection device including a liquid crystal video projector and the like.

[0002]

2. Description of the Related Art For example, a liquid crystal video projector, a film projector, and the like, in which an image is projected on a screen for viewing, are known.

In addition, the "Pulfrich's pendulum" phenomenon (a phenomenon in which a pendulum that looks like an elliptical movement due to parallax when viewed with a filter attached to one eye and touching left and right) is applied to "Video" as a pseudo-stereo image, random dot (RAMDOM
There is known a method of stereoscopically viewing a DOT STEREOGRAM by a view called a parallel method or a crossing method. Furthermore, as shown in, for example, Japanese Patent Laid-Open No. 59-30390, an example in which "stereo photography" is applied to a television is known.

[0004]

However, in the above-mentioned conventional liquid crystal video projector, etc., since the two-dimensional image on the screen is always recognized and viewed,
In order to enjoy on a larger screen, it is necessary to look apart depending on the size of the screen, which makes it difficult to view a large screen in a small room.

Further, when a stereoscopic image is viewed by the above-mentioned "Pulfrich's pendulum" phenomenon, a large screen can be viewed, but special glasses having red-purple and light-yellow filters for each eye are required. The color and depth of the left and right filters are different, so there was a problem that it felt very strange when applied. Further, there is a problem that training is required to stereoscopically view the random dots with the naked eye, and no one can easily stereoscopically view them. Furthermore,
In order to stereoscopically view a "stereo photograph" by the technique disclosed in Japanese Patent Laid-Open No. 59-30390, a special prism device is required for each person, and it is necessary to see it at the center of the screen. It was inconvenient to see.

Therefore, the present invention provides an image projection apparatus that allows a large number of people to easily enjoy a large image or a stereoscopic image with a realistic feeling even in a small room.

[0007]

In an image projection apparatus in which an image is projected on a screen by a projection means which emits polarized projection light, the polarized projection light of the projection means is separated into two right and left. The screen includes a separating means and a polarizing means for polarizing the left and right separated projection lights in directions orthogonal to each other, and a projection angle adjusting means for adjusting a projection angle of the left and right separated projection lights. The left and right images are projected on top of each other.

Further, in an image projecting device in which an image is projected on a screen by a projection means which emits unpolarized projection light, the projection light of the projection means is divided into right and left.
A splitting means for splitting the left and right projection lights and a polarizing means for polarizing the left and right split projection lights in directions orthogonal to each other, and a projection angle adjusting means for adjusting the projection angle of the left and right split projection lights. For the sake of convenience, the left and right images are shifted and projected on the screen.

Further, an image projection apparatus for projecting an image on a screen by a projection means for emitting polarized projection light is provided with a pair of projection means having polarization means for polarizing in directions orthogonal to each other. The projection lights polarized in the directions orthogonal to each other by the pair of projection means are projected on the screen at a predetermined interval.

[0010]

[Function] When an observer wears glasses with polarizing filters whose polarization directions are orthogonal to each other on the left and right sides and looks at the screen, a large image can be easily seen by the two left and right projection lights having the same polarization direction as the left and right polarizing filters. . In addition, the interval between the images formed by the two right and left projection lights is adjusted by the projection angle adjusting means or the like. With these, horizontal running images, random dots,
Both stereoscopic images can be viewed reliably and easily on a large screen with a natural-looking stereoscopic image. Furthermore, even with an image projection device equipped with a pair of projection means, a large screen or the like can be viewed reliably and easily.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

<First Embodiment> In FIGS. 1 to 3, reference numeral 1 is an image projection apparatus of the first embodiment. This image projection device 1
Is composed of a liquid crystal video projector 10 as a projection means and a stay type adapter 20. The resin-made cabinet 11 of the liquid crystal video projector 10 includes a halogen lamp 12 as a light source, a reflecting mirror 12a, and a first polarizing plate 13a from the rear surface side to the front surface side.
And a liquid crystal element (LCD) 14 and a second polarizing plate 13b. A knob 15 is rotatably supported at the center of the front surface of the cabinet 11 of the housing, and the projection lens 16 can be focused by turning the knob 15. Further, a power switch 17 is provided on the rear of the upper surface of the cabinet 11 that is a case type.
Is provided. Further, a speaker 18 is provided substantially in the center of the right side surface of the cabinet 11 and a volume knob 19a and an image adjusting knob 19b are provided on the front side thereof.

As shown in FIG. 2, the stay type adapter 20 includes a rectangular plate-shaped stay portion 21a and the stay portion 21a.
And an adapter body 21 made of resin, which is composed of a trapezoidal plate-shaped base 21b integrally formed with
Is rotatably supported by the stay portion 21a of the screw portion 22a.
And a stay portion 21a, which is a knob 22 that can be screwed into a tripod mounting screw hole 11a at the bottom of the above-mentioned cabinet 11
Positioning hole 1 at the bottom of the cabinet
Positioning pin 23 fitted to 1b and adapter body 2
A rectangular beam splitter (half mirror) 24 having a transmittance of 50% as a separating means standing upright on the base portion 21b of 1 at an angle of 45 degrees and a polarizing means closely attached to the front side of the beam splitter 24. Half wave plate 25 and a dial 26 as a projection angle adjusting means rotatably supported on the base 21b via a support shaft 26a and the like.
And a total reflection plane mirror (plane mirror) 27 fixed so as to stand upright on the dial 26.

Next, the optical system of the image projection apparatus 1 shown in FIGS. 3 and 4 will be described. First, the light emitted from the halogen lamp 12 in the cabinet 11 of the liquid crystal video projector 10 is reflected by the reflecting mirror 12a. Alternatively, the light is condensed by a lens (not shown) or the like to become parallel light, and the first polarizing plate 13
a, the LCD 14 and the second polarizing plate 13b. Then, normally, the image of the LCD 14 is formed as a virtual image on the screen 2 by the projection lens 16, but in the case of this image projection device 1, the image is split into left and right by the beam splitter 24 having a transmittance of 50%. . In addition, as shown in FIG. 4, the second polarizing plate 13b in the cabinet 11 is
Is a vertical linearly polarizing plate, the light 3 emitted from the second polarizing plate 13b is a vertical linearly polarizing plate.

Then, as shown in FIGS. 4 and 5, the beam splitter 24 splits the transmitted light 4 and the reflected light 5. The reflected light 5 is reflected by the total reflection plane mirror 27 and forms an image 8 on the screen 2. Further, when the transmitted light 4 passes through the half-wave plate 25, its polarization direction is rotated by 90 ° and becomes a horizontal linearly polarized light 6, which forms an image 7 at a position apart from the screen 2 in the horizontal direction by D. Becomes The value of the image formation deviation D can be changed by rotating the dial 26.

Here, the screen 2 is made of a material which does not scatter the projection light similar to that of the stereoscopic screen but reflects it in the same polarization direction. The half-wave plate 25 is made of a birefringent material such as a crystal, a retardation film, mica, or a TN liquid crystal, and can rotate the polarization direction by 90 ° by aligning it with the polarization direction of the incident light. Is something that can be done. Further, it is preferable that D is usually about 65 mm which is the distance between the eyes, but if the distance W between the optical axes of the beam splitter 24 and the total reflection plane mirror 27 is matched with the image shift D, regardless of the position of the screen 2, Total reflection plane mirror 2
The angle of 7 can be the same as the beam splitter 24,
It is necessary to increase the area of the total reflection plane mirror 27 as compared with the beam splitter 24 by the distance. further,
When the distance W is smaller than the image formation deviation D, the total reflection plane mirror 27 is changed depending on the distance between the projection lens 16 and the screen 2.
It becomes necessary to rotate the dial 26 to adjust the angle, but it becomes more compact. In this way, the relationship between the distance W and the image formation deviation D can be determined according to the purpose of use of the liquid crystal video projector 10 and the stay type adapter 20, for example, by reducing W for convenience of carrying. Good. Further, since W is sufficiently shorter than the distance between the projection lens 16 and the screen 2, as shown in FIG. 5, the images 7 and 8 differ by the optical path length W, but according to experiments, it is difficult to focus. However, it is a value that can be sufficiently ignored.

According to the image projecting apparatus 1 of the first embodiment, as shown in FIG. 6, the image projecting apparatus 1 is fixed by the tripod A, and the liquid crystal video projector 10 is directed to the screen 2 side to the screen 2. Appreciate the formed image. In this case, as shown in FIGS. 5 and 6, an observer B looking at the screen 2 at a distance L from the screen 2 has a horizontal linear polarization filter 5 for the left eye.
1, the right eye is equipped with the polarized glasses 50 having the vertical linear polarization filter 52, and the image formation 7 has the horizontal polarization, and the image formation 8 has the vertical polarization.
Then, the horizontal linear polarization filter 5 of the polarizing glasses 50.
Only the virtual image of the image 7 is transmitted to the left eye through the polarizing glasses 50 through 1.
Only the virtual image of the image formation 8 is visible to the right eye through the vertical polarization filter 52 in the vertical direction. If the image formation deviation D between the images 7 and 8 is smaller than the width of the eye, the virtual image 9 is visible at the position of the apex of the triangle L'away from the eye.

In this image projection apparatus 1, the image formation deviation D can be changed and viewed. For example, the image shift D
If the position of is made negative, the virtual image 9 seen at the position of the triangle apex L'away from the eye appears to project in front of the screen 2. However, normally, the image shift D is 35-35.
About 120 mm is preferable (according to experiments, there are individual differences in appearance). The position of the virtual image (image) 9 which is seen at the position of the apex of the triangle L'away from the eye is seen at a position where the user perceives the image based on his / her own experience rather than looking at the actual optical distance. In any case, the user does not feel the position of the screen 2 anyway, and it is possible to enjoy seeing the image 9 with a sense of non-planar presence further behind the wall C. In other words, you can enjoy the excitement of being in a theater where a singer is recitaling, or a soccer stadium. The wall C is preferably as dark as possible. Further, it is easier to see the screen 2 when it is smaller than the overlapping portion of the images 7 and 8. As shown in FIG. 6, the upper and lower portions of the screen 2 may be made smaller than the images 7 and 8 in order to match the aspect ratio of the screen 2 with the reduction of the width of the screen 2.

In the first embodiment, the case of two light beams of linearly polarized light 5 and 6 which are orthogonal to each other as the projection light projected from the liquid crystal video projector 10 and divided into two left and right parts has been described. In the case of this linearly polarized light, the image projected from the liquid crystal video projector 10 can be viewed with the polarized glasses 50 to which simple linearly polarized light filters 51 and 52 are attached. The observer B who looks at it must stand upright. For this reason, it is known that in the case of commercial use or the like, the rays of circularly polarized waves having mutually different rotation directions are projected and viewed with eyeglasses corresponding thereto. Of course, the first embodiment is not limited to linearly polarized light, but circularly polarized light can be used.

FIG. 7 shows a quarter of another embodiment of the first embodiment.
The case where linearly polarized light is changed to circularly polarized light by a wave plate (polarizing means) is shown. That is, quarter wave plates 28a and 28b are arranged at positions facing the beam splitter 24 and the total reflection plane mirror 27, respectively. These quarter wave plates 28a and 28b
Is to convert the linearly polarized light beams 4 and 5 into circularly polarized light beams 4'and 5'having positive and negative rotations depending on their angles. As shown in FIG. The quarter-wave plates 28a and 28b can project circularly polarized lights 4'and 5'having different rotation directions from each other.

<Second Embodiment> FIGS. 8 and 9 show a second embodiment. The difference between this second embodiment and the first embodiment is that
Instead of the ½ wavelength plate 25 of the first embodiment, a ¼ wavelength plate 28 as a polarizing means and a lateral linear polarization plate 29 are attached to the beam splitter 24 having a transmittance of ⅔. .

The operation will be described with reference to FIG. 9. The vertically linearly polarized light 3 emitted from the second polarizing plate 13b in the cabinet 11 is a beam splitter 24 having a transmittance of 2/3.
1/3 is reflected by this, and this reflected light 5 is a total reflection plane mirror 27.
Is reflected by and projected onto the screen 2. On the other hand, the transmitted light 4 that has passed through the beam splitter 24 having a transmittance of ⅔ has a light amount of ⅔, but becomes a circularly polarized light 4 ′ by the ¼ wavelength plate 28, and passes through the linearly polarizing plate 29 only in the lateral direction. After all, the amount of light becomes 1/3 of the original amount. In this way, the same amount of light is projected on the screen 2 with vertical and horizontal polarization. That is, in the second embodiment, it is shown that a quarter-wave plate for converting linearly polarized light into circularly polarized light may be used instead of the half-wave plate 25.

Although the projection light emitted from the projection lens 16 of the liquid crystal video projector of the second embodiment is the vertical linearly polarized light 3 (the same as in the first embodiment), in the actual case. Depending on the material and structure of the projection lens 16 and the like, the linearly polarized light may be slightly broken. Another mode of the second embodiment in such a case is shown in FIG. In FIG. 10, a disc-shaped linearly polarizing plate 29 'and a disc-shaped 1 /
The four-wave plate 28 'is integrally rotatable.
Then, for example, the first and second parts in the cabinet 11
The polarized light is polarized like the polarizing plates 13a and 13b, and the projection light 3 is slightly polarized by the projection lens 16.
When the linear polarizing plate 29 'is set at the same angle as the polarization direction of the second polarizing plate 13b', the linear polarizing plate 29 'first adjusts the linearly polarized light to a neat linear polarizing plate, and then the quarter wavelength plate 28'. Circularly polarized light 3'because of the action of. The circularly polarized light 3'is bisected by the beam splitter 24.

In general, when the propagation direction is reversed in a quarter-wave plate, that is, when a circularly polarized light beam is incident on the quarter-wave plate, the emitted light beam is converted into linearly polarized light. Figure 10
In the figure, 28 and 28 are a pair of quarter-wave plates, which are arranged so that when the circularly polarized light ray 3'is incident, it becomes vertical and horizontal linearly polarized light, respectively. When the polarization direction of the linearly polarized light is further adjusted by the respective linear polarization plates 29, 29, the vertical and horizontal light beams 5 and 6 can be projected on the screen 2.

Thus, the disc-shaped linear polarization plate 29 'and the disc-shaped quarter-wave plate 28' are rotatable integrally.
Regardless of whether the linearly polarized light of the incident light is vertical, horizontal, or diagonal, 1 /
Since the four-wavelength plate 28 'converts the light into circularly polarized light, any polarization direction of the liquid crystal video projector can be used.

<Third Embodiment> FIGS. 11, 12 and 17,
In FIG. 20, 1'denotes an image projection device of the third embodiment. This image projecting device 1'includes a liquid crystal video projector 10 'as a projecting means and a hood type adapter 30.
It consists of and. LCD video projector 1
Cabinet 1 made of resin with a curved upper surface of 0 '
1'includes a halogen lamp 12 as a light source, a reflecting mirror 12a, a first polarizing plate 13a, a liquid crystal element (LCD) 14 and a second polarizing plate 13b from the rear surface side to the front surface side. Further, a knob 15 is rotatably supported on a sleeve portion 11c integrally formed in the center of the front surface of the cabinet 11 'of the housing, and the projection lens 16 can be focused by turning the knob 15. You can do it. Further, a power switch 17 is provided on the left side of the upper surface of the cabinet 11 '. Further, a speaker 18 is provided at the substantially center of the left side surface of the cabinet 11 ', and a volume knob 19a and an image adjusting knob 19b are provided in front of it.
Further, an upper ventilation hole 11d is formed in the center of the upper surface of the cabinet 11 ', and a lower ventilation hole 11e is formed on the lower side of the front surface.
A groove 11f is formed between the upper ventilation hole 11d of 1'and the power switch 17 from the front side to the back side.

As shown in FIGS. 11 to 13, a hood-type adapter 30 is made of resin and has a front opening 31a which is opened in a large rectangle on the front side and a rear opening 31b which is opened in a small rectangle on the back side. Is fixed to a funnel-shaped case 31 and a left rear portion 31c integrally protruding next to the rear opening 31b of the case 31, and a curved plate 32 having a round hole 32a at a position facing the rear opening 31b. And case 31
It has a rectangular shape as a separating means which is erected at an angle of 45 degrees at a position facing the rear opening 31b in the inside and has a transmittance of 50%.
Beam splitter (half mirror) 33, a vertically-oriented polarizing plate 34 as a polarizing means that is erected so as to occupy the right half of the front opening 31a of the beam splitter 33, and is erected so as to be orthogonal to this polarizing plate 34. Then, a vertical polarizing plate 35a and a pair of quarter-wave plates 35, which are opposed to the beam splitter 33 and are in close contact with each other, are provided.
b, 35c, and a polarizing means 35 composed of a laterally-oriented linearly polarizing plate 35d, and a case 31 protruding outward from the left rear side surface of the case 31 and swingably supported on the bottom side of the case 31 via a support shaft 36. A knob 37 as a projection angle adjusting means for adjusting the lateral positions of the two images to be projected, and a knob 38 protruding outward from the left rear side surface of the case 31 and a support shaft 38 on the bottom surface side of the case 31. A knob 39 as a projection angle adjusting means for adjusting the positions of two images to be projected in the vertical direction, and a total reflection plane mirror (flat surface) whose tilt angle is adjusted by operating these knobs 37, 39. Mirror 40).

As shown in FIG. 12, a rib 32b is integrally formed on the rear left edge of the curved plate 32 of the adapter 30 and a protrusion 32c is integrally formed on the lower center of the rear surface. Then, in order to assemble the adapter 30 to the liquid crystal video projector 10 ′, the round hole 32 a of the curved plate 32 of the adapter 30 is formed in the liquid crystal video projector 1 ′.
It is fitted into the sleeve portion 11c of the cabinet 11 'of 0', the projection 32c of the curved plate 32 is inserted into the lower ventilation hole 11e of the cabinet 11 'and fitted, and the projection 32b of the curved plate 32 is fitted into the groove portion 11f of the cabinet 11'. By assembling by inserting and inserting. When assembled, as shown in FIG. 11, the knob 15 of the cabinet 11 ′ is exposed from the gap between the case 31 of the adapter 30 and the curved plate 32. You can focus on it.

Next, the optical system of the image projection apparatus 1'shown in FIGS. 13 and 14 will be described. In FIG. 14, the projection light 3 emitted from the projection lens 16 of the liquid crystal video projector 10 'is vertically polarized light. This projection light 3 is split to the left and right by a beam splitter 33 with a transmittance of 50%.
The divided and transmitted light 5 is projected after being polarized by a vertically oriented polarizing plate 34. In addition, the light reflected by the beam splitter 33 is linearly polarized by the vertically oriented polarizing plate 35a, then becomes circularly polarized by the quarter-wave plate 35b, and this time is horizontally polarized by the quarter-wave plate 35c. Becomes Then, after the polarization direction is adjusted by the horizontal linear polarization plate 35d, the light is reflected by the total reflection plane mirror 40 and projected forward. For the light 6 reflected by the total reflection plane mirror 40, the total reflection plane mirror 40 is held by the knobs 37, 39.
You can move vertically and horizontally by moving with.

Next, the total reflection plane mirror 40 is picked up by the knobs 37 and 3.
The mechanism for moving the camera in 9 will be described with reference to FIG. The total reflection plane mirror 40 is provided with a U-shaped metal fitting 41, and a metal rod-shaped shaft 42 penetrates the metal mirror 41. The upper end of the shaft 42 is rotatably supported by a holder portion 43 integrally formed on the rear inner wall of the left rear portion 31c of the case 31. The knob 39 is L-shaped and has a lower end of a shaft 42 rotatably attached to one end 39a. The knob 39 is rotatable around the support shaft 38, but is temporarily fixed by friction of the insertion hole 31e of the case 31 at the position where the knob 39 is rotated in the direction of the arrow in FIG. It is like this. The knob 37 also has an L shape, and is rotated around the support shaft 36 so that the other end 37a presses the back surface side of the total reflection plane mirror 40. Similar to the knob 37 and the knob 39, the knob 37 is temporarily fixed by friction of the insertion hole 31d of the case 31 at the position rotated in the direction of the arrow in FIG. Further, a torsion spring 44 is provided on the shaft 42 to urge the total reflection plane mirror 40 in a counterclockwise direction when viewed from above.

Here, when the knob 37 is rotated, the all opposite plane mirror 40 is rotated about the axis 42, so that the projection light can be moved in the left and right directions. Further, when the knob 39 is rotated, the upper portion of the shaft 42 is supported by the holder portion 43. Therefore, the total reflection plane mirror 40 moves only the lower portion of the shaft 42 by the amount of movement of one end of the knob 39, and the projection light It is designed to be able to move vertically. Thereby, the projection light (vertical direct polarization) 3 from one liquid crystal video projector 10 'is divided into two, and two projection lights 5 and 6 having orthogonal polarizations are obtained.
Two projected lights (left and right virtual images) 7 and 8 can be projected on the screen while being separated from each other at an arbitrary interval (this interval is indicated by a symbol D in the figure).

The stereoscopic display of the "horizontal running image" type screen as shown in FIG. 16 will be described using the image projection apparatus 1'of the third embodiment. This "side-by-side image" can be taken from a window beside a train or a car that normally runs, and recently, TV programs are being broadcast by computer graphics.

FIG. 16 shows a lateral running image E. This lateral running image E is an example taken from a mountain train, and trees in the foreground, houses in the middle, alps and clouds in the distant view flow sideways as the train progresses. FIG. 17 shows an example of enjoying this software. The image projected from the image projection device 1'is the plane mirror 4
It is reflected by 5 and projected onto the transmissive screen 2 '.
Here, the transmissive screen 2'is not able to maintain the polarization of paper or a piece of frosted glass whose surface is rough,
It is necessary to use a thin acrylic plate that is cloudy and whose polarization direction does not change when light is transmitted.

Projection is performed on the transmissive screen 2'with a distance substantially equal to the width D of the human eye. Then,
The viewer B will see the image with substantially parallel lines of sight.
By the way, when humans look at the scenery, they have parallel lines of sight. When actually viewed as shown in FIG. 17, the transmissive screen 2'feels like a window of a mountain train, and you can feel that you are seeing a vast landscape over there. As you get closer to the transmissive screen 2 ', you can enjoy a natural three-dimensional effect in which the scenery spreads over the entire field of view. The purpose of this system is to use a rear projector so that the shadow of your head does not reach the screen when you bring your face close to the screen.

Normally, when the sideways running image is viewed with the original filter glasses, the image has a strange three-dimensional effect, but the two images 7 and 8 on the left and right projected by the image projecting device 1'of the third embodiment are displayed. When viewed with polarizing glasses (one having a horizontal linear polarization filter 51 in the left eye and a vertical linear polarization filter 52 in the right eye) 50, a horizontal running stereoscopic image with a very natural feeling can be seen. Further, in the case of the normal filter glasses, if the lateral running direction is reversed, it is necessary to turn over the glasses, but in the image projection device 1'of the third embodiment, it remains as it is regardless of the lateral running direction. You can enjoy stereoscopic images.

Next, the "random dot" type stereoscopic vision as shown in FIG. 18 by the image projection apparatus 1'of the third embodiment will be described. Many books have been published on painting about random dot type solids. However, even if this image was taken with a video and projected on a large screen, the width and pitch of the eyes changed and it was difficult to stereoscopically view.

FIG. 18 shows an example of an image F of random dots. When the parallel mark is used so that the points of the two marks on the upper part of this image F can be seen as three points, the character "PAT" appears to be raised.

FIG. 19 shows a stereoscopic view with the naked eye.
Looking at the image F of random dots, the point R of the mark appears to the center and L to the left as the right image F _R with the right eye. The left eye is the opposite. In this way, it looks like three points like F ', and the character "PAT" appears at that time.

FIG. 20 shows an example in which an image F of random dots is photographed by a video camera (not shown) and projected by the image projection device 1 '. Marks on the screen 2 are roughly 3
Project so that it becomes a point. Then, the left eye looks like an image 7 and the right eye looks like an image 8. Therefore, in the end, a virtual image (image) 9 is formed.
You can see the stereoscopic image composited with your head like. Some random dot illustrations do not have the mark points printed, but in this case, the dots may be similarly separated. 20, the left and right positions of the projected virtual images 7 and 8 may be reversed by adjusting the knob 37. In this case, a screen in which the unevenness is the same as when the image of the parallel method is viewed by the crossing method is seen. In this way, the image F of random dots can be greatly enlarged, and a large number of people can surely and easily stereoscopically view a large number of people.

<Fourth Embodiment> In FIGS. 21 and 22,
1'is an image projection apparatus of the fourth embodiment. The image projection device 1'is composed of a liquid crystal video projector 10 'as a projection means and a hood type adapter 30'. The image projection apparatus 1'of the fourth embodiment is different from that of the third embodiment in that the center of the front opening 31a of the case 31 of the adapter 30 'is covered with a vertical hook 46, which is a "stereo photograph" type. Is used for stereoscopic viewing. It should be noted that the above-mentioned hanging member 46 is made of synthetic resin and has an L-shaped cross section, and is fixed to the center of the upper surface of the synthetic resin case 31 by means of welding or the like. You may

A stereo photograph G as shown in FIG. 23 used in the image projecting apparatus 1'of the fourth embodiment is shown in FIG.
A video camera 100 and an adapter 110 shown in FIG. That is, the adapter 11
It becomes possible by attaching 0 to the video camera 100. Case 11 that forms the outer casing of this adapter 110
A pair of left and right mirrors 112L, 1
12R are arranged, and a pair of left and right mirrors 114L and 114R are arranged behind the center hanging piece 113 in the case 111 so as to form a triangular tube shape with the hanging piece 113. As a result, the same images as seen by the left and right eyes are focused on the left half and the right half.
Further, the claws 11 are provided on the upper and lower parts of the cylindrical portion behind the case 111.
1a and 111a are integrally formed in a projecting manner, and can be detachably attached to the filter attaching screw portion 101 of the video camera 100. Incidentally, reference numeral 102 in FIG.
Is an imaging lens of the video camera 100.

FIG. 22 shows an image projection apparatus 1'of the fourth embodiment.
A projection method using is shown. First, adjust the knob 37,
The left and right images 7 and 8 are made to substantially overlap with each other. When this is seen with the polarized glasses 50, a stereoscopic image 9'can be seen. In this case, since the left and right images 7 and 8 are hidden by the attachments 46, the stereoscopic image 9'is easy to see with only one image instead of the three images that occur when viewing a stereoscopic image.

Note that this "stereo photography" type projection need not be the system shown in FIGS.
As shown in another aspect of the fourth embodiment, two left and right liquid crystal video projectors 10L 'and 10R' may be used. To briefly explain this, the same video signal is sent from the VTR 70 to the left and right two liquid crystal video projectors 10L 'and 10R'. The projection light is 46L on each side,
46R prevents unnecessary portions from being projected. The polarization direction of the left projection light is converted from vertical to horizontal by the half-wave plate 47. Further, as shown in another mode of FIG. 27, each of the above-mentioned other modes does not need to have the respective hooks 46L and 46R. In this other mode, the color of the wall C is set to black or a dark color that absorbs light, and the size of the screen 2 is set to be the same as or slightly smaller than the images on which the left and right stereoscopic images are projected, so that only the stereoscopic image is obtained. It will be displayed on screen 2.

As described above, in the image projecting apparatus 1'of the fourth embodiment, the "stereo photograph" type image G is simply put on the polarizing glasses 50 having a simple structure, and a large screen image 9'is displayed in large numbers. Anyone can surely and easily see stereoscopically.

<Fifth Embodiment> In FIG. 28, reference numeral 1 "denotes an image projection apparatus of the fifth embodiment. This image projection apparatus 1"
Is a slide projector (projection device, film projector, overhead projector (OHP), tube-type video projector, or the like) having projection light that is not polarized as projection means 10 ″ and a hood-type adapter 30 ″. It is configured. As shown in FIG. 28, the adapter 30 ″ is detachably attached to the overhead projector 10 ″.

29 and 30 show an optical system of the image projection apparatus 1 ". In the drawings, 16 is a projection lens and 26 is a dial as a projection angle adjusting means for rotating the total reflection plane mirror 40". Further, 33 ″ is a beam splitter having a transmittance of 50%, and 34 ″ and 35 ″ are horizontal and vertical linearly polarizing plates. The light beam divided by the beam splitter 33 ″ is linearly polarizing plates 34 ″ and 35. ″, The light beams having horizontal and vertical linear polarizations (orthogonal polarizations orthogonal to each other) 6 and 5 are emitted. However, in this case, the amount of light is lost by half in the horizontally and vertically oriented linearly polarizing plates 34 ″ and 35 ″.

FIG. 31 shows another mode of the fifth embodiment in which the light quantity is not lost. Here, reference numeral 48 is a polarization beam splitter, and the other structure is the same as that of the fifth embodiment. Therefore, the same parts are denoted by the same reference numerals and detailed description thereof will be omitted. The polarization beam splitter 48 can split the reflected light and the transmitted light into lights whose polarization planes are orthogonal to each other. That is, the polarized beam splitter 48 bisects the light rays 5 and 6 having vertical and horizontal linearly polarized light beams which are orthogonal to each other and is projected on the screen.

<Sixth Embodiment> FIG. 32 shows an image projection apparatus of a sixth embodiment having a pair of left and right liquid crystal video projectors (projection means) 10L and 10R. This image projecting device projects a normal 2D video signal on the screen 2 by shifting the left and right, and by viewing each image with both eyes, the screen 2 becomes invisible and there is an image behind it. This makes it possible to obtain a sense of realism even when viewed near the screen 2 by making the image look like.

FIG. 32 shows a concrete example of the image projection apparatus of the sixth embodiment, in which the same video signal is applied from the VTR 70 to the pair of left and right liquid crystal video projectors 10L and 10R. The liquid crystal video projector 10L on the left side includes a halogen lamp 12L and a pair of laterally polarizing plates (polarizing means).
13L and 13L, a liquid crystal element (LCD) 14L sandwiched between the polarizing plates 13L and 13L, and a projection lens 16L. Similarly, the liquid crystal video projector 10R on the right side includes a halogen lamp 12R, a pair of vertically oriented polarizing plates (polarizing means) 13R and 13R, and the respective polarizing plates 13R.
A liquid crystal element (LCD) 14R sandwiched between R and 13R and a projection lens 16R are provided. The images 7L and 7R projected from the two liquid crystal video projectors 10L and 10R have the same vertical height and are laterally displaced from each other by a distance D, and 8L and 8R are images therein. The screen 2 has an aspect ratio of about 3: 4, and is small so that the images 7L and 7R enter the overlapping portion. Further, the screen 2 is made of a material such as silver paper (silver-coated paper or the like), and is made of a material that reflects polarized light in the same direction so as not to scatter the polarized light. Observer B of this screen 2
The observer B can see the images projected by the two liquid crystal video projectors 10L and 10R with both eyes through the polarizing glasses 50 having the horizontal linear polarization filter 51 and the vertical linear polarization filter 52. There is.

FIG. 33 optically shows an image projected by the image projection apparatus, and the virtual image 9 seen by the observer B through the polarizing glasses 50 appears at a position away from the observer B by a distance L '. According to the experiment, two liquid crystal video projectors 1
Virtual image 8 in images 7L and 7R projected from 0L and 10R
The distance D deviated between L and 8R may be about 65 mm across the eye, and if the distance D is between 30 mm and 100 mm, the images are fused and can be recognized as an integrated image 9. In this case, the distance D is 65 mm
Optically, it is required that the image is not formed when the value exceeds, but the virtual image 9 can be seen by actually performing an experiment.
This is considered to be due to the size of the human brain's tolerance.

FIG. 34 shows an example of use of the image projecting apparatus of the sixth embodiment having the above construction. As shown in FIG. 34, the image actually visible even when viewed from a short distance from the screen 2 is visible at the back of the screen 2, so that the entire image can be viewed. In this way, you can see on a large screen even in a small room.
Also, two liquid crystal video projectors 10L and 10R
When an image 81 is projected on the screen 2 by another projector 80 whose polarization is inclined by 45 ° with respect to the polarization angle of, the observer B sees that the image 9 is deeper than the screen 2.
It can be recognized by comparing with. Instead of another projector 80, characters or marks may be drawn on the screen 2 and illuminated by a spotlight (not shown). To get this effect stronger,
It is preferable to darken the room and to darken the area around the screen 2 so that the position of the screen is incomparable to the walls and furniture of the room. By doing so, the user feels that "the screen 2 cannot be seen" and "the screen 2 has become transparent", and it is possible to immerse himself in enjoying the image 9 at the back of the screen 2 in distance.

In the sixth embodiment, an example of a projector using polarized light and polarized glasses is shown, but a television or the like may be used, or glasses may not be used.

Further, according to each of the above-mentioned embodiments, the image on the screen is viewed with the polarizing glasses with the polarizing filter, but the polarizing glasses 60 shown in FIGS. 35 and 36 may be used. The polarized glasses 60 have a shape attached to an inverted U-shaped headphone support portion 65, and have left and right sounding portions (headphones) 66L and 65R.
Allows you to hear the sound. In addition, a horizontal linear polarization filter 61 and a vertical linear polarization filter 6 are provided on the left and right lens barrels of the polarized glasses 60.
Contains 2. The pair of handles 63, 63 of the polarizing glasses 60 are rotatably attached about each support shaft 64, and the pair of handles 63, 63 can be lowered only to a position orthogonal to the headphone support portion 65. There is. FIG. 36 shows a usage example of the polarizing glasses 60. Headphone support 6
By putting 5 on the head, the polarized glasses 60 are supported and do not hit the nose, so that a person who does not wear glasses does not feel pressure. Further, for the person who wears glasses, the polarized glasses 60 are good to be stopped in the air above them.
Further, by using the left and right headphones 66L and 66R, the noise of the fan of the liquid crystal video projector is not heard, and the soft sound can be enjoyed.

[0054]

As described above, according to the image projecting device of the present invention, it is possible to see an image that does not make the viewer feel a flat surface further behind the screen, and the image is projected beyond the wall limited to the size of the room. Since you can see the image at the position, you can see it at a position close to the screen, and you can easily enjoy the powerful image with a very realistic feeling.

In addition, anyone can enjoy stereoscopic viewing on a large screen with a single image projection device. In particular, a person who cannot stereoscopically view with naked eyes, such as random dots or a stereo photograph, can easily stereoscopically view with the image projection device. Also, just by attaching a stay-type or hood-type adapter to the existing projection means, it can be enjoyed reliably and easily.

Furthermore, the image projecting device having the pair of projecting means makes it possible to enjoy an image having a depth behind the screen in a small room as if one were watching at a large theater.

[Brief description of drawings]

FIG. 1 is a perspective view showing an image projection apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the liquid crystal projector and the adapter of the image projection apparatus of the first embodiment are separated.

FIG. 3 is an overall plan view of an optical system of the image projection apparatus of the first embodiment.

FIG. 4 is a perspective view of a main part of an optical system of the image projection apparatus of the first embodiment.

FIG. 5 is a plan view showing a usage state of the image projection apparatus of the first embodiment.

FIG. 6 is a perspective view showing a usage state of the image projection apparatus of the first embodiment.

FIG. 7 is a main-part perspective view showing another aspect of the optical system of the image projection apparatus of the first embodiment.

FIG. 8 is an overall plan view of an optical system of an image projection device according to a second embodiment.

FIG. 9 is a perspective view of a main part of an optical system of the image projecting device according to the second embodiment.

FIG. 10 is a perspective view of a principal part showing another aspect of the optical system of the image projecting device of the second embodiment.

FIG. 11 is a perspective view of an image projection device according to a third embodiment.

FIG. 12 is a perspective view showing a state in which the liquid crystal projector and the adapter of the image projection apparatus of the third embodiment are separated.

FIG. 13 is a perspective view showing an optical system of an adapter of the image projection device of the third embodiment.

FIG. 14 is a perspective view of an essential part of an optical system of the image projection apparatus of the third embodiment.

FIG. 15 is a perspective view of a main part of an adapter of the image projection apparatus of the third embodiment.

FIG. 16 is an explanatory diagram of a lateral running image used in the image projection device of the third embodiment.

FIG. 17 is a perspective view showing a usage state of the image projection apparatus of the third embodiment using the lateral running image.

FIG. 18 is an explanatory diagram of random dots.

FIG. 19 is a plan view showing how the random dots are stereoscopically viewed with the naked eye.

FIG. 20 is an overall plan view of the image projection apparatus of the third embodiment using the random dots.

FIG. 21 is a perspective view of an image projection device according to a fourth embodiment.

FIG. 22 is an overall plan view of the image projection device of the fourth embodiment.

FIG. 23 is an explanatory diagram of a stereo image used in the image projecting device of the fourth embodiment.

FIG. 24 is a perspective view of a photographing device that photographs the stereo image.

FIG. 25 is a perspective view of a photographing device for photographing the stereo image.

FIG. 26 is an overall plan view showing another aspect of the image projecting device of the fourth embodiment.

FIG. 27 is an overall plan view showing another aspect of the image projection apparatus of the fourth embodiment.

FIG. 28 is a perspective view showing an image projection device according to a fifth embodiment.

FIG. 29 is a plan view of an optical system of the image projection apparatus of the fifth embodiment.

FIG. 30 is a perspective view of the essential parts of the optical system of the image projection apparatus of the fifth embodiment.

FIG. 31 is a perspective view of a principal part of another aspect of the optical system of the image projection device of the fifth embodiment.

FIG. 32 is an overall plan view of the image projection device used in the sixth embodiment.

FIG. 33 is an image explanatory view of the image projection apparatus of the sixth embodiment.

FIG. 34 is a perspective view showing a usage state of the image projection apparatus of the sixth embodiment.

FIG. 35 is a perspective view showing another aspect of the spectacles used in each of the above embodiments.

FIG. 36 is a perspective view showing a usage state of the spectacles of the other aspect.

[Explanation of symbols]

 1, 1 ', 1 "... Image projection device 2, 2' ... Screen 7, 8 ... Left and right images 10, 10 ', 10" ... Projection means 10L, 10R ... Pair of projection means 13L, 13L ... Polarization means 13R, 13R ... Polarizing means 20 ... Stay type adapter 24, 33, 33 "... Separating means 25, 35, 34", 35 "... Polarizing means 26, 37, 39 ... Projection angle adjusting means 30, 30 ', 30" ... Hood Type adapter 50 ... Polarized glasses

Claims (6)

[Claims] 1. In an image projection device, wherein an image is projected on a screen by a projection means that emits polarized projection light, the polarized projection light of the projection means is divided into right and left 2
A splitting means for splitting the left and right projection lights and a polarizing means for polarizing the left and right split projection lights in directions orthogonal to each other, and a projection angle adjusting means for adjusting the projection angle of the left and right split projection lights. An image projecting device, characterized in that it is arranged such that two right and left images are shifted and projected on the screen. 2. An image projection apparatus for projecting an image on a screen by a projection means that emits unpolarized projection light, comprising: a separation means for separating the projection light of the projection means into two right and left. A polarizing means for polarizing the left and right separated projection lights in directions orthogonal to each other is provided, and a projection angle adjusting means for adjusting the projection angle of the left and right separated projection lights is provided for the left and right sides of the screen.
An image projecting device characterized in that two images are shifted and projected. 3. The image projection apparatus according to claim 1, wherein the separating means, the polarizing means and the projection angle adjusting means are detachably attached to the projection means via a stay type adapter. 4. The image projection apparatus according to claim 1, wherein the separating means, the polarizing means and the projection angle adjusting means are detachably attached to the projection means via a hood type adapter. 5. An image projection apparatus, which projects an image on a screen by a projection means that emits polarized projection light, comprising a pair of projection means having polarization means for polarizing in mutually orthogonal directions. An image projecting device, characterized in that projection light polarized in a direction orthogonal to each other by a pair of projection means is projected on the screen at a predetermined interval. 6. The same image is projected on a screen as two images which are separated from each other by about two eye widths, and an image for the left eye is viewed by the left eye and an image for the right eye is viewed by the right eye. 2. A pseudo three-dimensional effect can be obtained by viewing the position of the image at a place different from the screen by wearing the polarized glasses which can be seen.
The image projection device according to any one of 5 to 6.