JP2002148713A - Joining device for video by a plurality of projectors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and readily eliminate a striped pattern formed at a border part by multi-screen projection at low cost. SOLUTION: Videos are projected on a plurality of screens 16 by using a plurality of projection type video devices and end parts of the videos are connected to generate a wide video. Light shield plates 21 and 22 are improved which are arranged in front of projection lenses of video generation parts provided in the projection type video devices 50 and 60 and shield end parts of projection lights to adjust the luminance of join parts T. The light shield plates 21 and 22 are constituted in multi-layered structure wherein flexible filmy filters 40 to 43 are stacked so that the transmissivity gradully decreases stepwise from the center part to the peripheral edge part of the projection light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video image projector, and more particularly to a projection type video device in a continuous multi-screen, for example, a video image joining device for joining video images of a video image projector.

[0002]

2. Description of the Related Art In recent years, a video display device has evolved from a television device that can be viewed by a small number of people at home, and has evolved into a projection type video device for a large number of people, such as a movie display for an aircraft. Such image projection devices include a projection device using high-luminance light emitted from a large CRT cathode ray tube, a transmission type projection device using liquid crystal, a liquid crystal reflection type projection device such as an ILA (image light amplifier type), and a DLP (digital light processing type). That is, various projection devices such as a reflection type projection device using a fine mirror have been developed. In addition, a single lens system has been generalized from the conventional three-lens system, and the light output of the projection device has been increased by a factor of two to three.
Has doubled.

[0005] A projection type video apparatus in a continuous multi-screen, that is, a video video projector will be described as a representative of a conventional liquid crystal reflection type projection apparatus such as an ILA. FIG.
Shows the basic configuration of a video image projector. A video (video) signal from a video playback device (such as a VTR) 1 is sent to the video generation laminate 2 via the pixel control unit 8, and controls amplification of video (optical) light. Image light composed of each color light is incident on the polarization beam splitter 3.

The polarizing beam splitter 3 has a 90
Intensity white light from the light source lamp 4 is simultaneously incident from the direction of the angle. The light source lamp 4 is a xenon lamp or the like having a high directivity, and a uniform light flux is obtained by a condenser lens 7 composed of a lens group arranged in a matrix (or lattice). It is a coherent wave that has been removed.

The white light enters the image generating laminate 2 through the polarizing beam splitter 3, is reflected upward after being light-modulated by the image signal, reenters the polarizing beam splitter 3, is combined with each of the RGB colors, and has a luminance. It becomes image light (high-brightness image light) composed of extremely high color light and enters the projection lens (double-sided convex lens) 5. The projection lens 5 refracts the luminance image light, and projects the image light L enlarged in proportion to the distance to a distant white screen 6.

The focusing of the image on the white screen 6 is performed by moving the projection lens 5 together with the lens holder 10 in the direction of the optical axis as shown by the arrow. For simplicity of description, the luminance on the white screen 6 is projected to be the best maximum white light as seen by the human eyes, and the luminance is assumed to be 1.0, and the part without the projected light (dark part) is regarded as 0.1. Set to 0. At a luminance of 1.0 or more, human eyes feel dazzling and painful.

[0007] Such video image projectors have become very popular in recent years, and are frequently used for various explanations and guidance in conference rooms, classrooms, and event venues. On the other hand, with the advent of multi-screen movies for entertainment, video software with high amusement properties has been supplied by a simultaneous multi-projection method using a plurality of video video projectors. Furthermore, in various simulation images, CGs processed by computer to bring out more realism
In addition to flat surfaces using video image projectors, multi-projection systems such as cylindrical screens, parabolic screens, and spherical screens have also emerged.

In general, when performing large-screen projection of a television, there is a method of performing high-brightness large-screen projection with a single device, but it is considerably expensive. Further, there is a method of using a fisheye lens when projecting onto a dome-type screen or the like, but there is a disadvantage that image quality is deteriorated. For this reason, a method of creating a large screen by dividing and simultaneously projecting a plurality of screens has been used. However, in the case of a so-called multi-screen (screen) in which a plurality of video image projectors simply project, a boundary is generally formed between adjacent screens.

[0009] Naturally, this boundary line is obstructive, and a method of eliminating this boundary line has been actually implemented. According to this method, the screens are overlap-projected (overlapping), and the brightness of the overlap-projected portion is doubled. However, the brightness of the boundary between the screens is adjusted so as to cross each other. There is a method to make the brightness even by "blending" over. The projection method by blending is roughly classified into the following two methods.

The above-mentioned optical processing method, the adjacent image and the image over the defocus portion (portion close to the lens) of the light beam (light flux) coming out of the lens surface of the image projection device are shaded by a shielding plate. And a blending method, or a signal processing method, that is, a method in which an input signal to a video projection device is controlled by a blending waveform so that the balance between adjacent images and luminance is equalized. In the above-described blending method using the optical method, the brightness can be adjusted from “black” to “white” in order to block a light beam. Among the latter signal processing methods, in the CRT method, control can be performed by signal processing from a "black signal" to a "white signal" in projection by white light emission of the CRT.

The conventional optical blending method will be described below for the case of using two video image projectors with a flat screen for simplicity.
In FIG. 2, an image is projected on a double-size screen 16 by two video image projectors 55 and 60.

One (left) video image projector 5
5 projects the left landscape in the horizontal direction and the other (right) video image projector 60 projects the right landscape. The video signal input to each of the video image projectors 55 and 60 is substantially equal to the right video image projector 60 in the left video image projector 55.
Similarly, in the right video image projector 60, a considerable portion of the left end of the right video image projector 60 includes the same portion as the right end image of the left video image projector 55.

In order to continuously connect the left and right images on the double screen 16, the left and right video image projectors 5
The images are projected onto the screen 16 from the positions 5 and 60, and the mutual positions of the video image projectors 55 and 60 are adjusted so that the images of the same portions on the left and right just overlap upon observation. That is, if the overlapping portion T does not look double, a wide image is observed as continuous, and is recognized as a natural image by the audience. Such overlapping of the images of the left and right video image projectors is called blending. In this way, the overlap of the images is almost completely matched.

However, even if the images match, the screen 16
In the upper T portion, both video image projectors 55,
Image light L-1 and L-2 from 60 are projected. For this reason, when considering the white light, the brightness of the T region is 2D, which is twice as large in the overlapping portion, where D is the brightness of the non-overlapping portion.

In order to make the dazzling brightness 2D of the T portion the same as that of the other non-overlapping portions, the light shielding plate 1 is provided immediately before the lens holder 10 of the video image projector as shown in FIG.
1 is arranged. As a result, the image light in the overlapping portion T of the images attenuates each other as indicated by E, so that even if the images on the left and right of the junction T are superimposed, the brightness is flat and it is expected that a natural image can be displayed. However, as shown in FIG. 4, the projection light L-1 and L-2 are diffracted by the light shielding plate 11, so that a luminance bulge F occurs. For this reason, two bright vertical lines appear in the left and right composite images, which impairs the smooth joining quality of the images in practical use.

Further, as shown in FIG. 1, in the liquid crystal reflection type projection apparatus using the high-intensity light source lamp 4 and the condenser lens 7, the light shielding plate 11 and the matrix (or lattice) of the condenser lens 7 are provided. The following phenomena also appear from the optical relationship due to the arrangement with the lens groups arranged in a). That is, when the projection light from the condensing lens 7 is diffracted by the shielding plate 11, the luminance of the joint surface is not smoothly attenuated, but becomes a striped stripe having a stepwise change, which impairs image joining.

For the sake of simplicity, it is assumed that the image light modulated and projected by the video reproducing apparatus 1 is also white. In FIG. 5, a light shielding plate 11 is arranged on the outer end surface of the lens holder 10 in parallel with the projection lens 5 and the white screen 6. The light shielding plate 11 is formed of a substantially perfect black plate, and shields a right end portion of the image light L projected from the projection lens 5. Tip edge P of light shielding plate 11
Passes through the optical path 14 and forms an image on the white screen 6. Since the right side of the optical path 14 is originally shielded from light, the luminance is predicted to be zero. However, since the image light L is combined with the light from the light source lamp 4, a diffraction phenomenon occurs, and the image light L is behind the edge P. Wrap around. Therefore, the brightness gradually decreases toward the edge of the screen.

However, recent projection type projectors are provided with the condenser lens 7 having high characteristics as described above. The condenser lens 7 is divided into a vertical and horizontal matrix (grating), and each of its segments is a small lens 1
7, and is arranged so as to uniformly irradiate the image generating laminate 2 with the light flux of the light source. In order to generate bright lines by a plurality of vertical (or horizontal) arrays of the lattice structure of the condenser lens 7, the vertical (or horizontal) bright lines are respectively generated at the vertical edge P of the light shielding plate 11. Due to the diffraction, a strip-shaped striped pattern S having a luminance difference in a stepwise manner is displayed on the screen.

This band of stripes becomes fine if the matrix (grating) of the condensing lens is fine, and if the matrix (grating) is coarse, it becomes wide and small in number. Therefore, when the left and right projectors shown in FIG. 5 are used, the image joining portion can eliminate the large difference in gradation by adding the luminance of the left and right stripe bands as shown in FIG.
However, with a slight level of vertical (or horizontal) stripes,
The raised portions G, G of bright bright lines as shown in FIG. 4 are generated. For this reason, when two images are joined, vertical stripes are recognized at a central portion, that is, a joining portion T with a slight level, which is annoying, and it has been desired to improve this.

[0020]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-screen image projected by a plurality of projectors by eliminating a boundary gap, overlapping a part of the screen with each other, and changing the brightness of a joint portion between them. It is an object of the present invention to provide an inexpensive and easily adjustable light shielding plate for suppressing the occurrence of a stripe pattern and making the joining hardly noticeable.

[0021]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 projects each image on a plurality of screens using a plurality of projection-type image devices. Then, in an image joining device that creates a wide image by joining the ends of the images to each other, the image joining unit is disposed in front of a light emitting lens of an image generating unit provided in the projection type image device, and the end of the projection light is A light shielding plate that shields and adjusts the brightness of the connecting portion, a plurality of flexible and film-like filters are stacked such that the transmittance gradually decreases from the center to the peripheral portion of the projection light. It has a multilayer structure, is characterized in that the joining width of the joint portion of the image is widened, and that the increase in brightness due to the diffraction effect of the projection light is suppressed.

According to a second aspect of the present invention, the shielding end (edge) of each layer of the filter having the multilayer structure is formed in a sawtooth shape.
The light shielding plate prevents a plurality of stripe-like bands from occurring at a joint portion of an image. According to the third aspect of the present invention, a complementary color filter is further superimposed on the filter having the multilayer structure, thereby preventing the light shielding plate from coloring a connecting portion of an image due to the color separation method of the projector. It is characterized by the following.

According to a fourth aspect of the present invention, the edge of the light shielding plate formed of the multilayer filter is formed in a non-linear shape so as to match the non-linear shape of the projection light frame in front of the projection lens of the projector. Features. According to a fifth aspect of the present invention, the light shielding plate formed of the filter having the multilayer structure is formed in a rectangular shape, the light shielding plate is compressed and deformed, and an edge formed by the curvature is arbitrarily matched with the non-linear shape of the projection light frame. The light shielding plate has an adjusting structure, and a curve of an edge of the light shielding plate is variable.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 shows an overall configuration in which, for example, two transmission type image gradient projectors (video image projectors) are provided with a transmission type density gradient shielding plate of the present invention. Two projection-type video devices 55 and 60 are placed on a screen 16 composed of a plurality of screens, and the video devices 55 and 60 are installed so that adjacent video images overlap each other. The image generating laminate 2, the polarizing beam splitter 3, the light source lamp 4, and the condenser lens 7 composed of a group of lenses 17 are the same as those in the related art, and the description is omitted.

Each of the lens holders 10 of the projection type video devices 55 and 60 is provided with a filter-shaped shielding plate for physically shielding these optical paths on a defocus line between the lens 5 and the screen 16. The filter-shaped shielding plates are the concentration gradient shielding plates 21 and 22 of the present application. The concentration gradient shielding plates 21 and 22 have substantially the same optical configuration, and are fixed to target positions on the respective lens holders 10 with their mounting directions reversed. FIG. 8 is an enlarged front view of the lens holder 10 and the density gradient shielding plate 22 viewed from the direction of arrow A in FIG. The right diagram in FIG. 8 is a further enlarged view of the circle portion in the left diagram, and the lower right diagram is a cross-sectional view taken along line BB1 in the right diagram.

In FIG. 7, the two density gradient shielding plates 21 and 22 are optically substantially the same in configuration only with respect to the arrangement direction. The density gradient shielding plate 21 is configured by sequentially overlapping a plurality of filters having a predetermined light transmittance (density). When overlapping, the second layer is shifted by a predetermined width R to the right in FIG. 8 with respect to the end of the straight line of the lowermost layer.
Similarly, the third layer is displaced by a predetermined width R to the middle right side with respect to the end of the straight line of the second layer with respect to the end of the straight line of the second layer. Here, an example of a four-layer filter is shown.
Although the layer is described as opaque, more layers may be used.

For example, if the filter densities of the first layer, the second layer and the third layer are set to the same 0.15, the filter density of the first layer is the same 0.15, and the second layer is the first layer and the second layer. Is 0.30 in the sum of the filter densities of the first and second layers.
The sum of the filter densities of the layer and the third layer is 0.45.
The filter density of each layer indicates the light transmittance within the width R at the end. When an appropriate concentration is selected as the filter concentration of each layer, a concentration gradient shielding plate 21 which is a filter having a predetermined width R that gradually changes from a transmission region to a non-transmission region can be obtained. When a plurality of filters are sequentially superimposed, the width R of the transmission band filter of each layer can be arbitrarily set by changing the variation width R each time.

The density gradient shielding plate 21 is a kind of neutral filter with respect to wavelength, and has a white light transmittance stepwise from, for example, the vicinity of the optical axis, and has a transmission density (D) of 0.15 in FIG.
From 0.30 to 1.2, and finally to an opaque plate. This is a gray scale (gradual change from white to gray then black) filter as referred to in printing technology. As a result, the width R becomes structurally stepwise, and the densities are respectively a band filter 50 with D = 0.15, a band filter 51 with D = 0.30 and a band filter 52 with D = 1.2, and The opaque wide band filter 53 is integrally formed.

In FIG. 8, these band filters 50, 51,
The width R of the deviation of the edge portion 52 is substantially the same, and the optimum value can be experimentally determined according to the setting of the distance between the video image projector and the white screen 6 and the width of the joint T. Each density filter constituting the density gradient shielding plate 21 is a film-like flexible sheet,
It is a relatively thin film. The thickness of the overlapped concentration gradient shielding plate 21 is about 1 mm. When the concentration gradient shielding plate 21 is bent to the extent that it is bent, it is possible to form a smooth curve by slightly sliding displacement with respect to the bending.

In FIG. 9, the projection lens 5 of the upper (left) projector 55 in FIG. 7 and the screen 16 by the diffraction of the density gradient shielding plate 21 whose width R is slightly exaggerated are written.
The effect on the situation will be described. The diffraction image of the density gradient shielding plate 21 placed immediately before the lens 5 due to the outermost opaque material 53 farthest from the central axis of the optical path appears at the portion f of the screen 16 and its luminance distribution is relatively narrow like j. It has a width and, as described with reference to FIG.

Next, the diffracted light and the reduced light quantity by the filter 52 of D = 1.2, which absorbs a large amount of light, are indicated by g at the place of g, and the luminance distribution is indicated by l. Next, the intermediate D =
The diffracted light and extinction by the filter 51 of 0.30 are shown at the position of h, and the luminance distribution is shown by m. Finally, the diffracted light and extinction by the filter 50 of D = 0.15 having a small light absorption are i , The luminance distribution is indicated by n.

Accordingly, the ND filters 52, 51, 5 arranged stepwise with respect to the luminance curve j of only the opaque material
A luminance curve of K can be obtained by adding the respective reduced light amounts l, m, and n of 0. In other words, it is possible to obtain a gentle inclination damping characteristic in which the rise of the luminance is suppressed and the width of the screen joining is widened.

Next, on the front surface of the lens of the other projector 60 to be joined as shown in FIG. 10, a density gradient shielding plate 22 having a characteristic of a reverse slope (lower left) with the composite luminance curve k of the lower right of FIG. Then, when these are added, the brightness of the junction T becomes almost the same level as the brightness 1.0 inside both windows, and the boundary between a plurality of screens can be formed into a continuous screen image with continuous brightness without any seamless brightness. .

As described above, a filter for optically and structurally changing the density in a stepwise manner has been constructed in order to smooth the luminance at the joint and to increase the width of the joint. However, FIG.
As described above, recent projection type projectors use the condenser lens 7 composed of a group of 17 small lenses arranged in a horizontal and vertical matrix (grating). At the edge of each layer filter of the concentration gradient shielding plate 22, diffraction occurs for each of the vertical (or horizontal) bright lines, so that a band-like striped pattern having a stepwise luminance difference is displayed on the screen. You. As a result, the light diffracted by the light shielding plate 11 is displayed on the screen 16 as a band-like stripe having a gradation difference that cannot be ignored. By superimposing the brightness of the other screen 16 having the opposite extinction curve, these stripes are canceled out and improved considerably, but they cannot be completely removed.

To further analyze the phenomenon of the occurrence of the striped band, if the edge P of the light shielding plate 21 is vertical in front of the lens 5 in FIG. The light becomes parallel to the arrayed light of the groups, and a diffraction image is generated on the screen by each of the plurality of vertical lenses 17 due to the brightness, and several stripes are generated in the vertical direction. FIG.
Similarly, when the edge P is placed in the horizontal direction as shown in (b), diffraction occurs due to the arrayed light of the group of lenses 17 in the horizontal direction of the grating of the condenser lens 7, and several horizontal stripes are formed in the horizontal direction. appear. If the edge P is inclined at an angle near the middle between vertical and horizontal on the front surface of the lens 5, for example, 45 degrees, FIG.
As shown in (c), it was experimentally confirmed that there was no influence of diffraction due to the lattice arrangement of the condenser lens, and that a continuous smooth luminance change was generated with no inclination without a stripe pattern.

Therefore, no fringes are generated completely, especially when the edge P is set at around the middle 45 degrees so that the edge P is not parallel to the lattice (vertical and horizontal) rows of the lens group 17 of the condenser lens 7 of the light source. On the other hand, when the screens of the left and right screens 16 are joined, the light shielding plate 21 is vertical (horizontal in the case of vertical connection).
And the influence of the slight vertical stripes could not be escaped.

An important point of the present invention is that the light shielding plate 21 as shown in FIG.
Has a serrated edge. That is, by making each of the jagged saw-toothed tips have an angle of about 90 (± 45) degrees, the edge is not parallel to the vertical arrangement of the lattice structure of the condenser lens 7, and thus, is striped. , And a smooth attenuation characteristic in terms of luminance could be obtained without generating diffraction.

Therefore, a plurality of filters having different densities are overlapped in FIG. 8 earlier, and the structure is further subjected to the above-mentioned saw-tooth processing, and as shown in FIG. If a serrated tooth is cut into 43, completely striped characteristics can be obtained. 13 is almost the same as the description of FIG. The angle of the serrated tip is about 90 degrees. The tooth pitch is experimentally determined to be the most effective value from the distance from the lens 5 and the pitch of the diffraction fringes, but it is appropriate to be about 1 mm.
The saw-toothed teeth of each filter are aligned and shifted by the width R so that the peaks and valleys are synchronized with each other.

Next, referring to FIG.
When the diffracted light is projected on the screen 16, the portion where the brightness changes at this joint is colored not blue or dark but blue or red, and is colored deeper toward the edge of the color screen. This is because the white light of the light source is decomposed into R, G, and B light inside the color projector, and each light is modulated by a video signal, and then each color is diffracted and colored due to the optical system that combines them again.

The colored light becomes red or blue depending on whether the light shielding plates 21 and 22 block the projection light on the right side of the lens 5 or on the left side. Therefore, when the light and shade portions are joined on these screens 16, they are synthesized and become almost white, but cannot be completely erased. In order to completely suppress the coloration after such synthesis, as shown in FIG. 15, the one density gradient plate 21 or the other density gradient plate 22 of FIG.
By pushing the color filter 44, which has a complementary color relationship to the colored light, at the position where the color light is most effective, coloring can be suppressed to a level having no practical problem. The position where the effect is highest is between any of the filters in each layer. In FIG. 15, the position is inserted between the opaque material 43 and the filter 42 having the density D = 1.2, and the deviation width of these edges is also set appropriately. This is shown.

Next, in FIG. 16, the image projected on the screen 16 is usually rectangular, but the projection optical path frame 45 immediately before the projection lens 5 is generally thread-shaped due to the characteristics of the optical lens, and the center is narrowed. . So far, this optical path frame has been described assuming a rectangular shape. For this reason, the light shielding plate 21 that joins the screens has been described as having a straight edge, but if the light-shielding plate 21 is straight because of the thread-shaped optical path frame 45, the band of the density change perpendicular to the joining portion on the screen will be described. I can't get it.

In order to cope with this point, in FIG. 17, it is necessary to dispose a light shielding plate 46 having a curved sawtooth density gradient having a curved edge corresponding to a pin-shaped projection optical path frame 45. The configuration of the light shielding plate 46 is the same as in FIGS. 13 and 15 except that the edges are curved. Next, means which can be easily manufactured and easily adjusted will be described. This light shielding plate 46 has an edge whose projection light frame 45
And a sawtooth shape is required. In addition, the curvature of this curve must be appropriately set according to the projector to be used and the mounting position, and is not constant.

It is enormous labor and cost to manufacture a light shielding plate 46 having serrated teeth and different kinds of curvatures different from each other, and to select an optimum one each time to join the screens. Not a target. It is an important issue from a practical point of view that the curvature of the edge curve can be easily adjusted, and that the production and adjustment costs are kept low.

In FIG. 18, the edge P of the light shielding plate 46 is
Is formed in a straight line, which is easy to manufacture, and has serrated teeth. This is arranged at a certain angle θ with respect to the lens surface Q, and both ends are compressed in the directions of arrows G and H and pressed in the direction J to bend the light shielding plate 46 as shown in the figure. be able to. Therefore, when viewed from the front of the lens 5, the edge becomes an arc shape, and by changing the compression value in the G and H directions and the angle θ, the curvature of the edge curve is adjusted so as to follow the pincushion curve of the projection optical path frame 45. You can do it.

Further, in FIG. 19, the compression values in the G and H directions can be adjusted by pushing the saw-toothed light shielding plate 46 sandwiched between the claws 111 and 112 and the screws 113 and 114 to adjust the degree of curvature. It can be changed arbitrarily. In addition, if the adjustment holes are provided on the left and right of the screwing holes of the screws 115, the variable shielding device 110 can be set at an appropriate position.

The device 110 is connected to the mounting table 11 on the opposite side.
By changing to the 6 side, it can be used as a shielding device of the other projector to be synthesized. Therefore, so that the right and left shapes of the joining surface on the screen exactly match, that is, to match the pincushion-shaped curve of the projection optical path of the lens surface,
Adjustment can be easily performed. As described above, the means for joining screens on a flat screen by two projectors has been described for convenience of explanation, but a larger number of images can be joined.

[0047]

According to the present invention, if a shielding device combining a density gradient filter, a color correction filter, a saw-tooth edge, an edge with a curvature, and a mechanism for adjusting the same is used, not only a flat screen but also a cylinder, a dome, and a hemisphere. Even on a screen having a shape such as a shape, a large screen with smooth and natural high image quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration at the time of projection by one video image projector.

FIG. 2 is a diagram showing overlapping of images at the time of projection by two video image projectors.

FIG. 3 is a diagram illustrating a state in which a combined luminance that is flat at a joint is predicted by a light shielding plate.

FIG. 4 is a diagram showing a state in which a swelling of luminance occurs at a joint due to a diffraction effect.

FIG. 5 is a diagram showing the synthesis of diffraction fringes by the grating structure of the condenser lens.

FIG. 6 is a diagram illustrating a state in which diffraction fringes due to a grating structure of a condenser lens of two video image projectors have occurred.

FIG. 7 is a diagram showing an entire configuration to which the light shielding plates of the present invention are attached.

FIG. 8 is a diagram showing in detail a configuration of a density gradient light shielding plate attached to a front surface of a lens according to the present invention.

FIG. 9 is a diagram for optically explaining diffracted light by the concentration gradient light shielding plate of the present invention.

FIG. 10 is a diagram showing screen joining on a screen provided with a concentration gradient light shielding plate of the present invention.

FIG. 11 is a diagram illustrating a state in which various stripes are generated due to the inclination of the light shielding plate.

FIG. 12 is a diagram showing an optical effect of the sawtooth light shielding plate of the present invention.

FIG. 13 is a diagram showing in detail a configuration of a sawtooth-shaped light shielding plate attached to the front surface of the lens of the present invention.

FIG. 14 is a diagram showing coloring of diffracted light by the sawtooth-shaped light shielding plate of the present invention.

FIG. 15 is a detailed view showing a configuration of a complementary color filter for preventing coloring of diffracted light by the light shielding plate of the present invention.

FIG. 16 is a diagram showing a shape of a projection optical path frame immediately before a lens.

FIG. 17 is a diagram showing in detail the configuration of a curved light-toothed light shielding plate attached to the front surface of the lens of the present invention.

FIG. 18 is a view showing the structural principle of the variable curvature light shielding plate of the present invention.

FIG. 19 is a view showing a practical structure of the variable curvature light shielding plate of the present invention.

[Description of Signs] 1 Video playback device 2 Image generation laminate 3 Polarizing beam splitter 4 Light source lamp 5 Projection lens 10 Lens holder 16 Screen 17 Small lens 21, 22, 46 Density gradient light shielding plate 40, 41, 42, 43 Sawtooth Shape band filter 44 Complementary color filter 50, 51, 52, 53 Band filter 55, 60 Video image projector 110 Variable curvature light shielding device 111, 112 Claw 113, 114 Curvature adjustment screw 115 Mounting adjustment screw 116 Mounting base D, E, F Luminance G, H, J Compression direction L, L-1, L-2 Video light P edge R width T junction

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenzo Fujisawa 4-3-12 Yotsuya, Shinjuku-ku, Tokyo F-term in Krypton Co., Ltd. (reference) 2H021 AA05 BA21 5C058 AB08 BA24 BA35 DA07 EA03 5C060 BD03 GB02 HC18 JA00 JB06

Claims (5)

[Claims] 1. An image splicing apparatus for projecting each image on a plurality of screens using a plurality of projection type image devices, and connecting end portions of each image to each other to create a wide image. A light shielding plate that is disposed in front of the projection lens of the video generation unit provided in the video device and that blocks the end of the projection light and adjusts the brightness of the connecting portion, from the center to the periphery of the projection light; So that the transmittance gradually decreases,
A plurality of flexible and film-shaped filters are stacked to form a multi-layer structure, the junction width of the image is expanded, and the increase in brightness due to the diffraction effect of the projected light is suppressed. An image joining device using a projector. 2. A shielding end (edge) of each layer of the filter having a multilayer structure is formed in a saw-tooth shape, and the light shielding plate is used at a joint portion of an image due to a lattice arrangement of a condenser lens of the projector. 2. The apparatus according to claim 1, wherein a plurality of striped bands are prevented from occurring. 3. A method in which a complementary color filter is further superimposed on the filter having the multilayer structure to prevent a color connecting portion of an image from being colored by the light shielding plate due to a color separation method of the projector. Claim 2
An apparatus for joining images by a plurality of projectors according to item 1. 4. An edge of a light shielding plate comprising a filter having a multilayer structure is formed in a non-linear shape so as to match a non-linear shape of a projection light frame in front of a projection lens of the projector. 3. An apparatus for joining images by a plurality of projectors according to 2. 5. A light shielding plate comprising the multilayer filter is formed in a rectangular shape, and the light shielding plate is compressed and deformed.
5. The image according to claim 4, wherein an adjustment structure for arbitrarily matching an edge due to the curvature with a non-linear shape of the projection light frame and a curve of an edge of the light shielding plate is made variable. Joining equipment.