JP2821032B2 - Multi-screen projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen projector having a plurality of unit projector units and an entire screen comprising a set of unit screen units corresponding to each unit projector unit. It relates to the configuration of a shaped screen.

[0002]

2. Description of the Related Art A multi-screen projector has a unit projector of n rows in a vertical direction and m columns in a horizontal direction (n, m).
(Arbitrary number) means that one giant screen is constituted by arranging them side by side. FIG. 2 shows the case of two rows and two columns. In the figure, 1, 2, 3, and 4 are unit projector units, and 5, 6, 7, and 8 are transmissive unit screen units.

A conventional multi-screen projector is
A box shape that is simply integrated with a normal home unit screen
It was in the form of stacking the unit TV projector.
For this reason, there is an opaque structure resulting from connecting the unit screens adjacent to each other at the hatched portion (seam portion) indicated by 9 in FIG. 1, and therefore, in the portion of the huge screen where the original image is to be projected. However, the shade caused by the opaque structure had to be generated.

[0004] The width of the shade is about 80 units wide.
In the case of 0 mm, it was about 8 mm or more, that is, about 1% or more. Since the size of the pixel of the unit television projector is about 0.2% of its width, the shade of 1% corresponds to about 5 pixels or more.

[0005] Fig. 3 shows a typical example of a structure of a unit screen having a diagonal length of about 40 ". The figure shows an example of a structure of two sheets. When viewed from the viewer side, a Fresnel sheet 11 is present on the back side. A Freon sheet 12 is disposed on the front side of the Fresnel sheet 11. The Fresnel sheet 11 has a thickness of about 3 mm and, although not shown in FIG. That is, the operation is equivalent to the operation of one convex lens.

The front sheet 12 has a lenticular lens 14 having a vertical stripe shape and a black stripe 13.
Are formed. Lenticular lenses diffuse light microscopically in the horizontal direction. That is, it is for expanding the horizontal directivity angle. A detailed configuration example is described in the inventor's US Pat. No. 4,536,056.

FIG. 4 shows a lenticular sheet 16 for diffusing light in the vertical direction. As shown in the drawing, a lenticular lens in the form of a horizontal stripe is provided on the entrance / exit surface, and diffuses light in a microscopic vertical direction. The lenticular sheet is used as a three-sheet sheet sandwiched between the Fresnel sheet 11 and the front sheet 12 in FIG.

[0008] It should be noted that the diffusing element (for example, SiO ₂ particles) for randomly diffusing light into the front sheet 12 shown in FIG. Have been done.

Each of the sheets 11, 12, and 16 shown in FIGS.
Are each made of a transparent resin belonging to the family of methacrylic resin or styrene resin. Therefore, it expands and contracts according to the change in the ambient temperature, and its temperature coefficient is about 60 PPM / ° C. In addition, it expands and contracts according to the change in ambient humidity, and its elongation is about 400 PPM in methacrylic system per 10% increase in relative humidity.
Or about 100 PPM for styrene.

Since the response to a change in humidity has a large time constant, there is a state where the moisture absorption distribution in the thickness direction of one sheet transiently becomes unbalanced. In such a case, there is a problem that the front seat 12 is deformed into a curved shape.

In order to overcome this problem, in the prior art, it was necessary to provide a frame for each unit screen at the joint (and the entire outer frame) shown in FIG.
For this reason, a large shade had to be generated in the adjacent portion between the unit screens. In order to minimize the shadow, the present inventor has already applied for a patent with a screen having the configuration shown in FIG. However, this configuration is not available as of December 26, 1990.
It is open to the public (Japanese Patent Application No. 1-1114906).

FIG. 5 shows some of the components of the two screens of the multi-screen according to the prior proposal. In this figure, reference numeral 11 denotes the same Fresnel sheet as 11 in FIG.
In a no-load state, the Fresnel sheet 11 has a size of about 40 ″, that is, about 800 mm in width, about 600 mm in length and about 3 mm to 1 mm in thickness. In order to provide the one-dimensional curvature, a normal planar Fresnel sheet is forced to have a one-dimensional curvature and a temperature of about 80 ° C. or higher in a state where the one-dimensional curvature is forcibly applied. It is well known that the one-dimensional curvature can be imparted by leaving it in an environment having a sexual deformation temperature, and details of the one-dimensional curvature will be described later, and the radius of curvature is selected to be about 10 to 30 m.

Reference numeral 21 in FIG. 5 denotes a hole provided in the Fresnel sheet 11. Reference numeral 22 denotes a wire, which is made of metal such as stainless steel or plastic such as nylon. This may be a single line or a stranded line, and an outer diameter smaller than a pixel size to be projected on a display (screen) is used. The wire 22 penetrates the hole 21,
A tension is applied to the Fresnel sheet 11 at least in a direction in which the Fresnel sheet 11 comes into close contact with the reinforcing sheet 20.

Reference numeral 23 denotes a spring, which is usually formed of a metal wire. Reference numeral 24 denotes a rigid support member, which is formed of a metal or plastic member. The spring 23 is provided on the support member 2.
A tension is applied to the wire 22 with 4 as a fulcrum. The tension is transmitted to the Fresnel sheet 11 via the wire 22, and the left end of the Fresnel sheet 11 is brought into close contact with the reinforcing sheet 20. The support member 24 is arranged in a free area on the screen that does not cause shadows on the screen. An example of the free area is illustrated in FIG. 9 described later.

FIG. 5 shows only the support structure at the left end of the unit screen, but the same structure is applied to the upper end, lower end, and right end. However, it is omitted in the figure for simplification of the figure. However, for the upper and lower ends, the wire 22 is
It penetrates through holes 25 formed in both the Fresnel sheet 11 and the reinforcing sheet 20. Although a large number of holes 25 are provided, only one hole 25 is shown in FIG.

FIG. 7 is a perspective view showing a complete left end structure in which a vertically long front sheet 31 is combined with the reinforcing sheet 20 and the Fresnel sheet 11 shown in FIG. In the figure, 22 is a wire, 23 is a spring, and 24 is a support member. Reference numeral 21 denotes a hole provided in the front sheet 31 and the Fresnel sheet 11. Wire 22 is hole 21
Through the outer side surface of the reinforcing sheet 20 and the spring 2
3 is connected. Accordingly, the tension of the spring 23 causes the front sheet 31 and the Fresnel sheet 11 to receive a component force in the direction in which the front sheet 31 and the Fresnel sheet 11 come into close contact with the reinforcing sheet 20.

Although only the support structure at the left end is shown in the figure, a similar structure is used at the right end. 32 in the figure is a hole penetrating through the front sheet 31 and the reinforcing sheet 20. The front sheet 31 is suspended and fixed to the reinforcing sheet 20 by separately passing a screw rod (not shown) through the hole. Note that the upper and lower ends of the Fresnel sheet 11 are not visible from the appearance of FIG. 7, but are supported by the wire through the holes 25 of FIG.

FIG. 8 shows the appearance of a conventional multi-screen. In the figure, reference numeral 20 denotes a longitudinal reinforcing sheet for each row, reference numeral 31 denotes a longitudinal front sheet for each row, and reference numeral 11 denotes about 40 "each.
It is a Fresnel sheet of the size. The support structure between the sheets is not shown, but is as described above.

[0019]

SUMMARY OF THE INVENTION The present invention aims to further improve and develop the above-mentioned conventional multi-screen structure.

In the above-described conventional configuration, there is a problem that the reinforcing sheet 20 is greatly shaken in a direction perpendicular to the screen surface during an earthquake. In addition, there is a problem that a deviation occurs in the front-rear direction due to a variation in the warpage of the reinforcing sheet and the appearance is impaired. In addition, in order to support the gravity of the Fresnel sheet 11, a through hole 25 is provided in the reinforcing sheet 20,
Although a thin wire is passed through the hole, there is a problem that the work is difficult. Further, there is a problem that the hole 25 itself produces shadows in the image. In addition, there is a problem that it is desired to further reduce the discontinuity of the image adjacent to the unit screen.

An object of the present invention is to solve these problems and problems and to provide a multi-screen projector having a multi-screen with a more excellent configuration.

[0022]

According to the present invention, a displacement of a multi-screen in a vertical direction ( front-back direction) of a screen is provided.
Unit screen section to overcome the problem of earthquake resistance
Prevents longitudinal displacement at the left and right adjacent parts
Providing a front-back direction displacement restraining means for.

Further, a shelf means is fixedly arranged below the reinforcing sheet to support at least the gravity of the Fresnel sheet. Further, an end projection light density urging means is provided for correcting light loss at least at the left and right ends of the unit Fresnel sheet.

[0024]

According to the present invention, the longitudinal displacement restraining means is substantially effective throwing.
It is provided in an area where there is no light. Therefore, the playback image
Harm is minimized.

The shelf means for supporting gravity supports the gravity of the lowermost Fresnel sheet. The gravity of the next Fresnel sheet is supported by the upper side of the lowest Fresnel sheet. Hereinafter, similarly, as a result, the total gravity of all the Fresnel sheets is supported by the shelf means.

The end projection light density urging means includes a unit screen.
To compensate for the loss of light at the joint
It acts to increase the density of light.

[0027]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a multi-screen in a multi-screen projector as one embodiment of the present invention.

The multi-screen shown in FIG. 1 is constituted by arranging a plurality of vertically long screens side by side in the left-right direction. the longitudinal direction displacement restraining means <br/> to prevent the occurrence of relative displacement), the effective projection light absence regions do not interfere with the projection light projected from the projector unit to the screen, it is arranged.

The vertically long screen is a vertically long reinforcing sheet 2.
0, a vertically long front sheet 31 and a vertically long Fresnel sheet 11 sandwiched between the two sheets, and a shelf 43 is fixed to the vertically long reinforcing sheet 20 at a position corresponding to the lowermost portion of the vertically long screen. The sheet 31 is drawn toward and adhered to the longitudinal reinforcing sheet 20 via the longitudinal Fresnel sheet 11 by the wire member 22 and the spring member 23 stretched between the sheet 31 and a predetermined absolute fixing position. Upon receiving the component force, the gravity of the vertical Fresnel sheet 11 is supported by the shelf 43 fixed to the vertical reinforcing sheet 20.

Hereinafter, description will be made step by step. 2 to 7
Those having the same symbols as in have the same functions. Although many sets of means for bringing the sheet 31 into close contact with the reinforcing sheet 20, such as the wire member 22 and the spring member 23, are used in many sets, only some of them are shown in the drawing and the drawing is simplified. Is being planned.

In FIG. 1, reference numeral 41 denotes a pin insertion hole having a diameter of about 3.5 mm (hereinafter, numerical values are described as reference examples).
Its depth is about 17 mm. The hole is disposed in a free area where no shadow of the projection light occurs as described later. 42 is the hole 41
The pin has a diameter of about 3 mm and a length of about 32 mm. The material of the pin 42 is a metal or a plastic material such as polyacetal. Reinforcement sheet 20
Is about 12 mm, the unit Fresnel sheet 11 has a thickness of about 3 mm, and its diagonal length is about 50 inches (1.25 mm). The thickness of the front sheet 31 is about 1 mm. The front sheet 31 and the reinforcing sheet 20 are formed by forming the unit sheets into a vertically long shape that is continuous in the vertical direction.

Reference numeral 43 denotes a shelf for supporting at least the gravity of the Fresnel sheet 11. In the drawing, the configuration is such that not only the gravity of the Fresnel sheet 11 but also the gravity of the front sheet is supported. The material of the shelf 43 is metal or plastic. The shelf 43 is fixed to the reinforcing sheet 20 with a screw or an adhesive. The depth of the shelf 43 is about 4 mm in this example.

Reference numeral 44 denotes an interface unit for suspending the gravity of the entire screen by a separate suspending means (not shown). The material is metal or plastic. It is fixed to the reinforcing sheet 20 by a screw or an adhesive. 45 is a horizontal neighbor 2
This is a metal plate for connecting and fixing the vertically long reinforcing sheets 20 to each other, and is fixed by screws 46.

Now, the description of the configuration of FIG. 1 has been completed, and then the operation thereof will be described. The pin 42 is inserted and arranged in a hole 41 formed in a side wall of the reinforcing sheet 20. Therefore, the reinforcing sheet 20 has a function of equalizing the displacement of the reinforcing sheet 20 in the z direction (direction perpendicular to the screen surface, that is, the front-back direction). That is, there is a function of preventing adjacent reinforcing sheets 20 on the left and right sides from generating uneven steps in the front-rear direction. The shelf 43 has a function of supporting the gravity of the Fresnel sheet 11 and the front sheet 31. The front sheet 31 is pressed toward the reinforcing sheet 20 by the spring 23. The front sheet 31 also presses the Fresnel sheet 11 in the direction of the reinforcing sheet 20. Therefore, the Fresnel sheet 11 and the front sheet 31 are prevented from falling off the shelf.

Accordingly, the screw holes 25 (means for supporting the Fresnel sheet 11 on the reinforcing sheet 20) required in FIG. 5 showing the prior art can be omitted. Therefore, the harmful shade of the screw hole 25 and the screw to be inserted therein can be prevented, and as a result, the quality of the reproduced image can be improved. In FIG. 1, the gravity of the upper Fresnel sheet 11 is supported by the lower Fresnel sheet 11, and the two sheets are automatically brought into close contact by the gravity. Therefore, the discontinuous width of the horizontal stripe-shaped seam generated between the vertically adjacent Fresnel sheets can be minimized.

FIG. 9 corresponds to a side view of the embodiment shown in FIG. 1, and shows a free area which is a non-existent area of the effective projection light which does not hinder the projection light projected from the projector unit onto the screen, and an effective projection which hinders the projection. FIG. 4 is a diagram for describing a prohibited area that is a light existence area.

FIG. 9 shows a case in which four unit reinforcing sheets are stacked. Reference numeral 20 denotes a reinforcing sheet, and reference numeral 41 denotes a side hole formed in a side wall of the reinforcing sheet. The hatched area 55 indicates the prohibited area on a vertical cross-sectional view of the screen. Similarly, a hatched portion 56 indicates a prohibited area in the horizontal sectional view of the screen.

If there is an object that blocks light in the prohibited area, a harmful shadow is produced on the screen. That is, the prohibited area is an area where the effective projection light exists. The free area is the remaining area excluding the prohibited area. The hole 41 is provided in the free area. Therefore, there is no harmful shadow. In addition, since the reinforcing sheets 20 can be expanded and contracted in the left-right direction as a whole with the left-right direction being closely in contact with the change in the environmental temperature and humidity, vertical line gap can be minimized. Also described later
As shown, connect the Fresnel sheet vertically
Is also good. In that case, of course, remove the reinforcing sheet
Thus, holes 41 may be provided in the side wall of the Fresnel sheet.

FIG. 10 is a perspective view showing a main part of a second embodiment of the present invention. The purpose is to ensure the screen is earthquake resistant.

In the figure, reference numeral 42 is the same as the above-described pin 42 in FIG. 1, and is inserted into the pin insertion side hole 41 (FIG. 1) of the reinforcing sheet 20 in the mounted state. Reference numeral 47 denotes a z-direction restraining metal plate. 49 is a pin, 50 is an L-shaped fitting, 51 and 53 are screws, 52 is an L-shaped fitting, and 54 is a beam as a fixing member.

Referring to FIG. 1 and FIG. Metal plate 47
The pin 42 is inserted through a hole 48 provided at one end thereof. The pin 42 is inserted through the side hole 41 of the reinforcing sheet 20. Therefore, the metal plate 47 exists between the vertically elongated reinforcing sheets 20, that is, between two adjacent reinforcing sheets 20. The other end of the metal plate 47 is connected to a beam 54 as a fixing member via a pin 49, an L-shaped fitting 50, an L-shaped fitting 52, and a pin 53. As a result, the metal plate 47 is located between the reinforcing sheet 20 and the beam 54 as a fixing member, and the two are fixed in the z direction. That is, the metal plate 4
7 functions as a longitudinal absolute displacement restricting means for restricting the absolute displacement of the screen (reinforcement sheet 20) in the longitudinal direction (z direction).

Again, a specific description will be given once again. The thickness of the metal plate 47 is about 1 mm and the length is about 180 m
m and the width will be described later, and the material can be stainless steel or iron. A hole 48 is provided at one end. The pin 42 passes through the hole 48. Therefore, the one end of the metal plate 47 is sandwiched from the left and right by the reinforcing sheet 20 in the mounted state. The other end of the z-direction restricting metal plate 47 is connected to a first L-shaped bracket 50 by a pin 49. The thickness of the first L-shaped gold is about 5 mm in this example. 51 and 53 are screws. 52 is a second L-shaped bracket. The first L-shaped bracket 50 is connected to the second L
It is connected to the character fitting 52. Reference numeral 54 denotes an L-shaped beam. The second L-shaped fitting 50 is fixed to the L-shaped beam 54 by the screw 53. The beam 54 is not shown, but will be described later with reference to FIG.
Are fixed to the column member 128 as the longitudinal displacement restraining means 127. The column member 28 is shown in FIG.
Exists in the free region 57 on the horizontal sectional view of FIG.

Now, the description of the configuration of FIG. 10 is finished, and the operation will be described next. As described above, each sheet constituting the screen is made of a transparent plastic material. Therefore, it expands and contracts with changes in environmental temperature and humidity. Therefore, the z-direction displacement constraint mechanism must be free at least in the height (y) direction.

In FIG. 10, the diameter of the pin 42 is about 3 mm.
Whereas, the diameter of the hole 48 is about 3.5 mm. Therefore, it can rotate freely. The pin 49 can also be freely rotated. Therefore, the mechanism of FIG. 10 does not restrict the displacement of the pin 42 in the height direction. A slight displacement is also allowed in the horizontal direction (x direction) by the action of the pin 49.

On the other hand, the displacement in the z direction (front-back direction)
Obviously, it can be constrained by the zero mechanism. The peripheral edge of the entire screen (reinforcement sheet) regulates the displacement in the z direction by a separate frame means.

Next, the earthquake resistance will be described in relation to the displacement in the z direction. According to the records of the world's historic earthquakes,
The maximum acceleration in the horizontal plane is about 0.5 times the gravitational acceleration G. The vibration spectrum is about 0.5 Hz to 5 Hz. Therefore, it is desirable to design so as to withstand the acceleration of 1 G and to design the resonance frequency to be about 5 Hz or more.

In FIG. 10, the element serving as the KEY (key) is a metal plate 47 for restraining in the z direction. The metal plate is 1G
The conditions for preventing buckling at the acceleration of are as follows. As described above, the pins 42 are provided at adjacent nodes of the unit screen. In FIG. 1, although not shown, pins can be provided by separately providing holes at the upper and lower ends of the Fresnel sheet 11. When a huge number of unit screens constitute a huge multi-screen, the number of pins 42 is almost equal to the number of unit screens.

The mass per unit screen is about 20 kg based on the numerical examples described above. Therefore, the acceleration of 1 G is 20
Equivalent to the power of KgG. According to Euler's buckling formula, it is necessary to satisfy the following equation.

[0049] {F / (E I)} 1/2 ≦ (π / l) ............................................. (1) Here, F = 20KgG E ≒ 20000KgG / (mm ) ² (Young's modulus) I = (bt ³ ) / 12 (second moment of area) t = 1 mm (thickness) l = 180 mm (length) b: width When the width b of the metal plate 47 is obtained from the above equation. ,

B ≧ {12F / (Et ³ )} · (l ² / π ² ) ≒ 40 mm

That is, the width of the z-direction displacement restricting metal plate 47 is set to 40 mm or more. Most of the metal plate except for the vicinity of the hole 48 can be formed in an L-shape to increase the buckling strength. In addition, the thickness of only the portion of the metal plate 47 on the side of the hole 48 on the side of the hole 48 which is sandwiched by the reinforcing sheet 20 (section of the arrow 48 'in FIG. 10) of about 12 mm can be reduced by about half. is there. This is because the buckling resistance can be improved by the sandwich pressure. By doing so, the gap between the reinforcing sheets 20 can be reduced, and thus the discontinuous width of the vertical seam can be minimized.

When the z-direction displacement is constrained by the configuration of FIG. 10, the z (z) of the screen (20, 11, 31) of FIG.
The directional resonance mode is close to the resonance mode of the beam 54 that supports the left and right edges of each reinforcing sheet 20. According to the material dynamics, the resonance frequency f ₀ of the reinforcing sheet 20 is determined by the following equation (the thickness of the Fresnel sheet 11 and the front sheet 31 is thin, so that the mass is ignored).

F _o ≒ ｛(πt) / (4a ² )｝ · ｛E / (3ρ)｝ ^1/2 ((2) ≒ 8.5 Hz> 5 Hz

Here, t ≒ 12 mm (thickness) a ≒ 100 mm (width) E ≒ 300 KgG / (mm) ² (Young's modulus) ρ ≒ 1.2 g / (cm) ³ Therefore, the above numerical examples satisfy the design requirements. .

As described above, the front-back direction of the screen (z direction)
Concludes the explanation of the earthquake resistance of. Next, the seismic resistance in the left-right direction (x direction) will be described. When the reinforcing sheet 20 is regarded as a pendulum, its length is about 1.5 m or more, and its resonance frequency is 0.5 Hz or less. Since this is below the seismic spectrum, the screen can be considered as a simple inertial body in the x direction.

When an acceleration of 1 G is applied to the screen in the x direction, a horizontal shear stress: F _S is applied to the horizontal section of the reinforcing sheet 20 of FIG. It can be expressed by the following equation. F _S = α · ρ · y (3) where α = 1G (acceleration) ρ = 1.2 g / (cm) ³ y = high Sa (height measured from the bottom)

According to Mohr's theory of the stress circle, when the horizontal shear stress is present, the same value of the conjugate shear stress is also present in the vertical direction. The vertical shear stress is shown in FIG.
Need to be communicated from Thus metal plate 45 which shearing force F ₁ that needs to be shared by one per are left connecting fitting of a given (upper and lower ends by: pin 42 pin 42
Work with the group. ). F ₁ ≒ F _S · H · t = α · ρ · y · H · t (4) where H = 750 mm (unit screen height) t = 12 mm (thickness) αρy: Refer to formula (3) ∴ F ₁ ≒ (10.8 G / mm) y ………………………… (5)

Therefore, for example, when the maximum value of the screen height is about 3 m (in the case of a four-stage system), the value of F _{1 is} as follows. F _{1 max} ≒ 10.8G × 3000 ≒ 32KgG ………………………… (6)

Therefore, the material and diameter of the pin 42 and the thickness of the reinforcing sheet 20 may be selected so as to withstand the shearing force according to the number of stages stacked in the vertical direction. In addition, it is effective to adhere at least partially the adjacent side surfaces of the reinforcing sheet 20 for a super-large screen of a super-multi-stack. Alternatively, remove the reinforcing sheet and replace it with a
The renel sheet may be adhered in the vertical and horizontal directions. On the spot
Even in this case, the longitudinal displacement restraining means of the present invention is
And earthquake-resistant. This concludes the description of the second embodiment. Next, a third embodiment will be described. This is to reduce the apparent discontinuity of the image at the upper / lower / adjacent boundary of the unit Fresnel. Since the third embodiment skillfully utilizes the inventor's discovery regarding the visual physics of the human eye, the visual physics will be described with reference to FIG.

In FIG. 11, reference numeral 58 denotes a black point representing the shape of a square having a side width of ε, and reference numeral 59 denotes a black line serving as a long shadow of the width ε. Observing from a nearby location, both can be easily identified. However, if the viewing distance D is large,
First, it becomes difficult to identify the existence of 58 black spots. In the case of a standard eyesight person, the threshold of the minimum discrimination angle is about 1 minute, that is, about 0.
3mrad. Therefore, when the value of ε is about 1 mm, about 3.3 m
Is the detection limit. At this time, the black spot 5 on the retina
It is estimated that the illuminance distribution corresponding to No. 8 has a valley of about 1.6% to 5%. The state of the valley is shown at 60 in FIG. The horizontal axis θ is the viewing angle.

As the viewing distance D is further increased, the black line 59
Is difficult to identify. The threshold of the minimum discriminating angle is about 0.03 mrad in several examples that we have experimented with. That is, a line having a width of 1 mm corresponds to a viewing distance of about 33 m.

It is presumed that the difference between the points / lines is caused by a two-dimensional / one-dimensional response difference of the illuminance distribution on the retina. Roughly speaking, it can be interpreted as follows. The linear object threshold is approximately equal to the retinal illumination distribution at a viewing angle of 0.03 mrad.
It is assumed that it corresponds to a valley of 1.6% (a known detection limit of middle area luminance difference). Then, the depth of the valley of the line image at 0.3 mrad of vision of about 10 times is estimated to be about 16%, which is about 10 times from the theory of one-dimensional Fourier analysis. Visual (0.3mrad)
^In the case of the point image of ^2, the image is further blurred and expanded in the horizontal direction, and the depth of the valley is determined by the theory of two-dimensional Fourier analysis as (1).
6%) ² or about 2.6%. This is interpreted as a threshold for a point-like (two-dimensional small viewing angle) object.

Now that the point / line response difference has been considered, the 0.3 mrad line response valley depth is 16%, as described above, and assuming a normal distribution, An eye frequency characteristic G (f) is obtained. According to Fourier's theory,

G (f) = (1 / θ ₀ ) · exp [(−πθ ² ) / θ ₀ ² ] · exp (j2πfθ) dθ (7) The above equation In (7), θ is the viewing angle. θ ₀ is a constant that should be called the effective divergence angle of the line image as shown in the profile 61 on the retina in FIG. From the condition of 16% at 0.3 mrad described above, the value of θ ₀ can be obtained as follows. θ ₀ ≒ (0.3 / 0.16) mrad ≒ 1.9 mrad …………………………………………………………………………………………………………………………………………………… (8) G (f) = exp (−πθ ₀ ² f ² ) ≒ exp− (3.3 mrad f) ² ………………………… (9)

Therefore, when a pattern in which white and black are alternately repeated as shown in the repetition pattern 62 of FIG. 13 is seen, the frequency response is as follows because the value of f is 1 cycle / 0.6 mrad. G (1 / 0.6mrad) = exp (-5.5 ² ) ≒ 7.3 × 10 ^-14 ……………………………

Since the pattern shown in FIG. 13 has a square wave shape, a Fourier coefficient of 4 / π is taken into consideration, and C in FIG.
C = 2 (4 / π) G ≒ 1.9 × 10 ^-13 ………………………… () 11)

That is, the ripple of the illuminance on the retina is extremely small and cannot be discriminated. Conversely, it is estimated that the value of C needs to be 1.6% (0.016) or more in order to be able to discriminate the number of repetitive patterns, and when the spatial frequency value f ₀ corresponding to this is obtained, the above equation (9) ), From (11)

G (f) = exp− (3.3 mrad f ₀ ) ² = 0.016π / 8 ≒ 6.3 × 10 ⁻³ ………………………………………………………………………………………………………………………………………………………………………… (12) (f ₀ ≒ (1 cycle) / ( 1.46mrad) ……………………… (13)

That is, the discrimination threshold of the repetitive pattern has a period of 1.46 mrad, that is, a black width of 0.73 mrad. The above results are arranged to obtain the following equation.

[0070]

As can be seen from the above table, it is presumed that the discrimination of the number of repetition patterns is relatively difficult due to the nature of vision. The bottom column in the table belongs to the inventor's demonstrative discovery.
If this property is applied to the vertical stitch of the screen, if the discontinuity width of the seam is within about 1.46 mrad and the average luminance of that part is about the same as the surrounding screen, it is visually recognized as discontinuity It is estimated that it will not be.

In other words, even if there is a black line having a width of 0.3 mrad at the joint, a bright line brighter than the surrounding screen is added within 1.46 mrad in the vicinity of the black line, and the average luminance of the bright line and the black line is reduced. By approaching the brightness of the screen, it can be said that the appearance of black lines can be reduced. This concludes the description of the basic visual principle of the third embodiment of the present invention.

FIG. 14 shows the structure of the upper and lower ends of the unit Fresnel sheet, which is the main part of the third embodiment of the present invention. The figure is a vertical sectional view. The reinforcing sheet and the front sheet are omitted for easy understanding.

In FIG. 14, reference numeral 11 denotes a Fresnel sheet;
65 is a Fresnel lens surface. Numeral 64 denotes a projection light source, solid arrows denote ordinary rays, and dotted arrows denote energizing rays. 66
Reference numerals denote light urging lens portions at the upper and lower ends of the unit Fresnel sheet, which are essential parts of the present invention.

The light indicated by the dotted arrow is lost as light deficiency at the joint in the prior art where the overscan light energizing deflecting prism (or lens) 66 has a flat shape. (A black paint is applied to the side surface of the Fresnel sheet 11 and is absorbed by the black paint.) In the present invention, the light that has conventionally been lost is effectively emitted light, as indicated by a dotted arrow, by the action of the light urging prism (or lens) 66 provided on the upper and lower entrance surfaces of the unit Fresnel sheet 11. Made available as

FIG. 15 is an enlarged view of the joint between the unit Fresnel sheets 11 and 11. The vertical angle of view α in the Fresnel medium is about 0.2 rad. Accordingly, the width v of the light urging lens portion in the figure is 0.2t ≒ 0.6 mm. On the other hand, the gap d of the joint is about 0.3 mm. About 0.15 per Fresnel sheet
You only need to activate the light by mm. For this purpose, the required refraction angle of the light urging lens 66 is 0.15 mm / 3 mm, or about 0.05 rad. Since the refractive index n of the Fresnel medium is about 1.5, the prism angle β in FIG. 15 is β = 0.05 rad × n / (n−1) = 0.15 rad according to Snell's law.

As an effect of the embodiment having the configuration shown in FIGS. 14 and 15, when the seam width (spacing) d is 0.3 mm, when viewed from a viewing distance of about 1 m or more, it is close to the 0.3 mm-wide optical defect zone. The light-powered zone merges to make the seam insignificant. In the prior art, it was detected within a viewing distance of 10 m. Therefore, as a theoretical limit, an improvement of about 10 times can be achieved. This concludes the description of the third embodiment of the present invention.

FIG. 16 shows a fourth embodiment. This figure is an enlarged view of the main part as in FIG. In FIG. 15, a light urging lens 66 is used, whereas in FIG. 16, a total reflection mirror 67 is used. The solid line normal ray and the mirror 67
May be set to half of the required refraction angle 0.05 rad. This is the end of the description of the fourth embodiment.

Next, a fifth embodiment will be described. Before that, a supplementary explanation of the problems of the prior art will be given with reference to FIG.
FIG. 17 shows the Fresnel sheet 1 as in FIGS.
1 is a cross-sectional view showing an upper / lower end portion of FIG. The figure shows a case where the upper / lower side surfaces 68 are not blackened. The ineffective light indicated by the dotted arrow is totally reflected at the end face 68, and as a result, as shown in FIG.
Is emitted. As described above, when the vertical upper and lower angle of view α in the Fresnel medium is 0.2 rad, the value of γ becomes as large as about 0.6 rad. Therefore, it looks like a harmful black line when observing the screen seam from the front. In addition, observing the screen seam from above / below (in the direction of the specific angle γ) results in harmful white bright line interference. If the end face 68 is painted black, the white line interference disappears, but the black line interference remains.

FIG. 18 is a sectional view showing a fifth embodiment of the present invention for solving the above problem. In the figure, 69
Is a striped light diffusion sheet for light biasing (or a striped lenticular sheet or striped prism sheet that refracts light in the vertical direction), and a non-effective light incidence portion on the incidence surface of the Fresnel sheet 11, that is, overscan. It is bonded to the light incident part. Its width is about 0.6mm and its thickness is about 0.3mm or less. The end face 68 is coated with black paint. In the figure, at least a part of the overscan incident light indicated by the dotted line is refracted in a desired direction and emitted as outgoing lights 71 and 72. These light-energizing rays have an effect of reducing black-line interference at the joint. Some of the overscan incident light, indicated by the dotted lines, is refracted in an undesirable direction, but they are absorbed by the black end face 68.

FIG. 19 shows an example of the shape of the light urging sheet 69 used in FIG. In FIG. 19, 69-1 is a vertical sectional view of a striped lenticular sheet, 69-2 is a striped prism sheet, and 69-3 is a vertical sectional view of a striped prism / lenticular sheet. The angle β in FIG. 19 is the same as β already described in FIG. This is the end of the description of FIG.

FIG. 20 shows a sixth embodiment of the present invention. In the figure, reference numeral 11 'denotes a linear Fresnel sheet, and a linear Fresnel lens surface 73 is formed on an exit surface thereof. A basic configuration method of a unit screen using a linear Fresnel lens is described in US Pat. No. 4,536,056 described in the description of FIG.
It is noted in the specification.

While the ordinary circular Fresnel lens 11 has the function of refracting light two-dimensionally (horizontally / vertically), the linear Fresnel lens 11 'is one-dimensionally (only in the vertical direction in this example). Refracts light. 20 is a light urging prism (end face prism) 74 provided at the upper and lower ends of the linear Fresnel lens sheet 11 '.
It is.

If the end face prism 74 does not exist,
The limit of the effective light is ray 75. However, if 74 exists, the limit of the effective light is 76. That is, in FIG.
The overscan light in the area indicated by the width W is converted into effective light by the action of the light urging prism 74. Therefore, black line interference is reduced and overscan information is recovered. The size of the width W is set to about half of the average value 0.3 mm of the gap d, that is, 0.15 mm. This concludes the description of the sixth embodiment.

The third, fourth, fifth, and sixth embodiments described above have been disclosed for reducing black line interference at the upper / lower and boundary portions of the unit Fresnel sheet. These can also be applied to reduce left / right / boundary black line interference. In that case, the aforementioned light urging means is applied to the left / right ends of the Fresnel sheet 11.

However, the joint width at the left / right end is usually as large as about 1.5 mm. This is the top / bottom gap 0.3
It is about 5 times mm. Therefore, about 5 times light energizing is required. To this end, it is effective to provide the light urging means described in the third and fifth embodiments at the left and right ends on the incident surface side of the reinforcing sheet 20. The thickness of the Fresnel sheet is about 3 mm as described above, and the thickness of the reinforcing sheet is about 12 mm. Therefore, the width of the overscan light incident portion shown in FIG.
On the incident side of the Fresnel sheet, it was about 0.6 mm as described above, whereas on the incident side of the reinforcing sheet, it was about 5 times that of about 0.6 mm.
mm. Therefore, the light energizing five times as described above is possible.

FIG. 21 shows seventh to ninth embodiments of the present invention. FIG. 2 is a horizontal sectional view of the reinforcing sheet 20. The overscan light energizing / deflecting prism 77 corresponds to the prism (or lens) 66 in FIG. 15, the overscan light energizing / deflecting mirror 78 corresponds to the mirror 67 in FIG.
The overscanning light biasing element 79 corresponds to the diffusion sheet 69 in FIG. The description is omitted because it is the same as above. This concludes the description of the embodiment of the present invention for reducing the black linear disturbance.

Next, a modified embodiment of the present invention will be described.
As a matter of course, the support member 24 in FIG. 7 may be attached to the reinforcing sheet 20 using the upper and lower ends of the reinforcing sheet 20 as interfaces. However, this may be modified as shown in FIG.

FIG. 22 shows a main part of such a modification as a tenth embodiment of the present invention. In the figure, reference numeral 20 denotes a reinforcing sheet, 11 denotes a Fresnel sheet, and 31 denotes a front sheet. Reference numeral 21 denotes a small hole, 22 denotes a wire, and 23 denotes a spring. 8
0 is a support member with a thickness of about 0.8 mm, a width of about 10 mm, and a length of about 10
mm. The material is metal or plastic. The support member 80 is adhesively fixed or screw-fixed to the side surface of the reinforcing sheet 20. In the figure, the wire 22 is connected to the spring 23 via the other side of the support member 80. Although FIG. 1 shows only the left side surface of the reinforcing sheet 20, the same means is naturally provided on the right side.

A free area (see FIG. 9) of about 3 mm exists on each of the left and right ends on the incident side of the reinforcing sheet 20. A spring 23 is arranged in the free area. According to this configuration, the required number of springs is half that of FIG.

As described above, on the incident surface side of the Fresnel sheet, there are free areas of about 0.6 mm each on the left and right ends, for a total of 1.2 mm. Therefore, the thickness of 0.8 mm of the supporting member 80 sandwiched between the reinforcing sheets is allowed.
This concludes the description of the tenth embodiment. FIG. 23 shows an eleventh embodiment of the special processing of the left and right ends of the entire multi-screen according to the second embodiment of the present invention described above with reference to FIG. FIG. 23 shows only the main part, and FIG.
In order to prevent the pinch 42 from coming off the holes 41 and 48 (FIG. 10). FIG.
Reference numeral 20 denotes a reinforcing sheet located at the left end of the entire screen. 47 is the metal plate already described in FIG.
Is connected to the L-shaped bracket 50 with the pins described above. 42 is a pin, 48 is a hole in the metal plate 47, and 41 is a side hole in the reinforcing sheet 20. Reference numeral 81 denotes a presser fitting which is a main part of the present embodiment. The holding member 81 is fixed to the reinforcing sheet 20 by bonding or screwing. The pin 42 is prevented from falling off by the action of the holding metal member 81.

In FIG. 23, one press fitting 81 is provided for each pin. As an alternative, reinforcing sheet 2
Only one long holding metal that can be fixed via the screw 46 of FIG. 1 may be used only at the upper and lower ends of the zero.

FIG. 24 shows a modification of the combination of the metal plate 47 and the pins 48 in FIG. 10 showing the second embodiment of the present invention as a twelfth embodiment. In the drawing, reference numeral 47 denotes a metal plate for restraining displacement in the z direction, and reference numeral 82 denotes a single-sided pin, which is half the length (about 16 mm) of the pin 42 in FIG. The diameter is about 3 mm. The one-sided pin 82 is welded at its base 83 to the metal plate 47 (without holes).

The metal fitting shown in FIG. 24 is inserted into the hole 41 in FIG. 1 to restrain the displacement in the z direction. However, at that time, the left and right sides are used independently. Therefore, at that time, the connection fittings 45 at the upper and lower ends in FIG. 1 are omitted. In the description of the seismic strength of the second embodiment (FIG. 10), it has been described that a vertical shear force is applied to the pin 42. In the twelfth embodiment,
Each reinforcing sheet 20 can be independently inclined left and right. Therefore, no shear force is applied to the one-side pin 82. Therefore, the one-side pin 82 need only withstand a load in the z-direction (a direction perpendicular to the screen surface). The acceleration in the z direction during an earthquake is about 0.5 G, and the corresponding force is
It is as small as about 10 kgG per screen. Therefore, the strength of the welded portion of the root 83 can sufficiently withstand it.

As can be seen from the above description, the twelfth embodiment is an extremely powerful means for realizing a huge screen having a stack of six or more, that is, a super high-rise building.

In the twelfth embodiment described with reference to FIG. 24, since the force applied to the pin 82 is small as described above, the hole 41 is not formed in the side surface of the reinforcing sheet 20 of FIG. The bonding technique may be used instead. This is the thirteenth
25 is shown in FIG.

In the same figure, reference numeral 47 denotes a z-direction displacement restraining metal plate. As in the case of FIG.
It is connected to the character fitting 50. 25 are a metal plate 84 and a pin 85 as a connecting member. Metal plate 8
4 is fixed to the side surface of the reinforcing sheet 20 by adhesive bonding or screwing. Even if the reinforcing sheet 20 expands and contracts with a change in humidity temperature due to the action of the pins 49 and 85, no excessive stress is applied to the bonding portion of the metal plate 84. The above is the first
The description of the third embodiment is finished.

In each embodiment of the present invention, the exit surface of the reinforcing sheet 20 and the entrance surface of the Fresnel sheet 11 may be optically integrated. As a method for integration, a reinforcing sheet and a Fresnel sheet may be bonded (adhered), or a Fresnel lens surface may be formed directly on the emission surface of the reinforcing sheet 20. Alternatively, the unit Fresnel sheets 11 may be thickened in advance, holes may be formed in the upper and lower adjacent side surfaces, and the unit Fresnel sheets 11 may be connected in the vertical direction with vertical pins.

The projection light source unit used in the present invention may be a normal 3CRT, a CRT projector using three lenses, or a single lens type projector using a liquid crystal panel.

Finally, a second embodiment of the present invention (FIG. 10)
The supplementary description of the effect of improving the buckling strength by the z-direction (front-rear direction) absolute displacement restraining means (metal plate 47) described in (1).

This will be described with reference to FIG. FIG. 3 is a horizontal sectional view of the reinforcing sheet 20 in four rows. Reference numeral 88 denotes z-direction restricting means (z-direction displacement restricting metal plate 47) for the left and right end surfaces of the entire screen described in FIG. Reference numeral 89 denotes z-direction restricting means (the z-direction displacement restricting metal plate 47) for each node shown in FIG.

FIG. 26 shows a case where a total pressure P is applied in the left-right direction. As can be seen from the figure, without 89,
As shown by the dotted line waveform (buckling waveform) 86, buckling is performed with the dimension of 4a as a half wavelength. In the case of 89, buckling occurs with the dimension a being a half wavelength. Euler's formula as described above
(1) is shown again as (14) below. According to this, to prevent the buckling,

{P / (EI)} ^1/2 ≤ (π / l)... (14) where E = 300 kgG / (mm) ^2. ... (Young's modulus) I = (bt ³ ) / 12 ... (Second moment of area) t = 12 mm l = 4000 mm ... 89 no l = 1000 mm ... 89 available b = Screen height p = Total pressure P If / (bt) is written as pressure P ²

P ₂ ≦ ｛(Et ² ) / 12｝ · (π ² / l ² ) P ₂ ≒ 2.2 gG / (mm) ² ………… 89 None P ₂ ≒ 36 gG / (mm) ² …… ……… 89 available When deformed, P ₂ ≒ 1.2gG / (cm) ³ × 1.8 m ………… 89 No P ₂ ≒ 1.2gG / (cm) ³ × 30m …………… 89

That is, in the case where the z-direction displacement restricting means 89 of the present invention is provided, buckling does not occur even in the case of a huge screen having 4 rows and 4 columns. That is, the z-direction displacement restricting means of the present invention has an effect of improving the earthquake resistance and the buckling strength by reducing the buckling half wavelength to the unit screen width. Although FIG. 26 illustrates the horizontal cross-sectional view of the multi-screen, the same effect can be obtained for a vertical cross-section.

In addition, the z-direction displacement restricting means deforms the entire screen macroscopically as shown in a buckling waveform 86 in FIG. 26 in accordance with the difference between the front and back stretching stresses caused by the temperature and humidity changes in the surrounding environment. And has the effect of improving the uniformity of the image.

The third to ninth embodiments (FIGS. 14 to 2)
The method for making the overscan light effective as described in 1)
All the edge projection light density biasing means are described as being applied to the screen side. By applying it to the screen side, it has the advantage that it can automatically follow the proportional expansion and contraction of the entire screen. Does not have the advantage, but as an alternative
It is also possible to provide the end projection light density urging means on the projection light source side. In the case of CRT projectors, the end projection
The light density biasing means can be replaced by an electron beam assisted deflection means. That is, there is provided means for locally deflecting the overscan electron beam of each CRT in the direction of the effective screen.

FIG. 27 shows a main part of a fourteenth embodiment, and FIG. 28 shows operation waveforms. In FIG. 27, 90 is a CRT (cathode ray tube), 91 is an auxiliary vertical deflection coil, 92 is a current detecting resistor, 93 is a negative feedback amplifier, 94
Is a well-known input signal for registration correction, 95
Is an adder, 96 is an energizing deflection pulse generating circuit, 97 is a retrace pulse signal input, and 98 is a main deflection coil.

Other than the bias deflection pulse generating circuit 96 shown in FIG.
The operation of only the portion will be described below with reference to a waveform diagram 28. In FIG. 28, reference numeral 97 denotes a vertical retrace pulse waveform, 10
0 is a vertical deflection current flowing through the main deflection coil 98, and 101 is an output of the energizing deflection pulse generation circuit 26. According to a digital processing technique using a known multivibrator or the like, generation of such a waveform is easy. Waveform 102
Is a waveform showing the combined effect of the deflection current shown by 100 and the auxiliary deflection current by the pulse wave of 101. In the same figure, the timing indicated by the dotted line corresponds to the effective light portion (10
4) and the boundary between the overscan light portion (103).

As can be seen from FIG. 28, it can be seen that the overscan light portion (103) is locally assisted in the direction of the effective screen. Therefore, light near the joint between the upper / lower unit Fresnel sheets is emphasized. Therefore, the joint can be made inconsistent. 27 and 28 describe the vertical deflection system, the same applies to the horizontal deflection system.

As a fifteenth embodiment, a measure applicable to a liquid crystal projector is shown in FIG. As is well known, in a general liquid crystal projector, pixels are fixed to a liquid crystal panel. Therefore, electron beam deflecting means cannot be used. Therefore, as an alternative, means for biasing and deflecting the overscan light in the light incident on the liquid crystal panel is used.

In FIG. 29, reference numeral 105 denotes a screen,
Reference numeral 06 denotes a projection lens, 107 denotes a liquid crystal panel, 108 denotes a lamp, 109 denotes a mirror, and 110 denotes a biasing / deflecting means, ie, end projection.
Light density biasing means . The light emitted from the lamp 108 is
The light is made almost parallel by the mirror 109 and illuminates the liquid crystal panel 107. The image light modulated by the panel 107 is formed on the screen 105 via the projection lens 106. Attached
FIG. 30 shows a main part of a specific example of the urging means 110.

In FIG. 30, the solid line is a light beam corresponding to the limit of the effective screen, and the dotted line is the overscan light. 110
Reference numeral -1 denotes prism means, 110-2 denotes various means described in FIG. 19, and 110-3 denotes mirror means. This concludes the description of the fifteenth embodiment.

[0114] Finally, as biasing means, shown in Figure 31 an example of using the boundary image signal enhancement means as the sixteenth embodiment. In FIG. 31, reference numeral 111 denotes a CRT or a liquid crystal panel;
Reference numeral 2 denotes a well-known gain-controllable amplifier; 113, an image signal input terminal; 114, an image signal enhancement pulse signal generator;
Reference numeral 15 denotes a horizontal / vertical retrace pulse signal input terminal.

The emphasizing pulse signal generating section 114 generates a pulse signal at the timing corresponding to the dotted line in FIG. Since the image signal is emphasized in the amplifier 112 at the timing, it has an operation of equalizing the discontinuity of the joint. This concludes the description of the sixteenth embodiment. 32 and 33 show a seventeenth embodiment of the present invention.
The figure shows an example using a total of 16 projectors of 4 rows and 4 columns. FIG. 32 is a side view as viewed from the left, and FIG. 33 is a view as viewed from above. The effective screen size of the entire screen is about 4 m in width and 3 m in height.

32 and 33, reference numeral 125 denotes a projector,
Reference numeral 126 denotes a screen, 127 denotes a longitudinal displacement restraining means (shown as 47 in FIG. 10) described in FIG.
128 is a column member to which the longitudinal displacement restraining means is finally fixed. The column member 128 is connected to the beam 129 by screws or welding to increase the strength of the entire gantry (129). The space between the projector group 125 and the column member 128 is used as a space for repair and maintenance. The floor 131 is supported by the beams 129 and forms a floor on which a person can walk during maintenance. Further, a column member 1
28 supports the ceiling beam 132 and functions to support the gravity of each vertically-long screen row via the interface unit 44 described above with reference to FIG.

The requirements of this embodiment are as follows. (A) The column member 128 is disposed in the effective projection light non-existing area behind the joint of each vertically long screen row. (B) The column member 128 supports gravity for suspending each screen row. (C) The column member 128 functions as a fixed end of the absolute displacement restraining means in the front-rear direction of the screen. (D) The column member 128 supports a part of the gravity of the maintenance floor 131.

[0118]

The effects of the present invention are as follows. (1) Because of the action of the side holes and pins provided in the free area on the side surface of the reinforcing sheet, it is possible to prevent the occurrence of a displacement deviation in the front-rear direction between the reinforcing sheets, so that a giant multi-layer with excellent uniformity in appearance. A screen projector can be provided. (2) Since the position in the front-rear direction of the screen surface can be regulated by the displacement restricting means in the z direction (perpendicular to the screen surface), the buckling strength against earthquake can be ensured. Also, it is possible to prevent the entire screen surface from warping depending on changes in the environmental temperature and humidity. Therefore, the uniformity of the reproduced image can be improved. (3) At least the gravity of the Fresnel sheet group is supported by the shelf means provided at the lowermost portion of the screen, the fall is prevented by the complementary action with the spring means, and the gap between the unit Fresnel sheets is minimized. And the seam width of the image is minimized.

(4) Edge Projection Light Density for Making Light at the Seam Part Effective Light
The urging means can improve the uniformity of the reproduced image. (5) A multi-screen projector with excellent maintainability can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a schematic configuration of a multi-screen projector.

FIG. 3 is a perspective view showing a specific configuration example of a unit screen.

FIG. 4 is a perspective view showing a lenticular sheet.

FIG. 5 is a perspective view showing a configuration of a screen according to a previously proposed method.

FIG. 6 is a perspective view showing a warped state of the Fresnel sheet.

FIG. 7 is a perspective view showing a left-end structure of a complete type of a conventional screen.

FIG. 8 is a perspective view showing the appearance of a conventional multi-screen.

FIG. 9 corresponds to a side view of the embodiment shown in FIG. 1, and is a view for explaining a free area and a prohibited area.

FIG. 10 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating visual physics according to the discovery of the present invention.

FIG. 12 is a characteristic diagram showing a profile on a retina.

FIG. 13 is a diagram showing a black-and-white repetition pattern and its frequency response characteristic.

FIG. 14 is a side sectional view showing the structure of the upper and lower ends of a unit Fresnel sheet as a main part of still another embodiment of the present invention.

FIG. 15 is an enlarged view of a joint between unit Fresnel sheets in FIG. 14;

FIG. 16 illustrates another embodiment of the present invention.
It is an enlarged view similar to.

FIG. 17 is a diagram for explaining a problem of the related art.
FIG. 17 is an enlarged view similar to FIG. 16.

FIG. 18 is an enlarged view of a joint between unit Fresnel sheets for explaining still another embodiment of the present invention.

19 is a cross-sectional view showing an example of the shape of the light urging sheet used in FIG.

FIG. 20 is an enlarged view of a joint between unit linear Fresnel sheets for explaining still another embodiment of the present invention.

FIG. 21 is a horizontal sectional view of a reinforcing sheet for explaining still another embodiment of the present invention.

FIG. 22 is a perspective view showing a main part of still another embodiment of the present invention.

FIG. 23 is a perspective view showing a main part of still another embodiment of the present invention.

FIG. 24 is a perspective view showing a metal plate for explaining still another embodiment of the present invention.

FIG. 25 is a perspective view showing a main part of still another embodiment of the present invention.

FIG. 26 is an explanatory view showing an effect of improving buckling resistance by the z-direction absolute displacement restraining means.

FIG. 27 is a circuit diagram showing a main part of still another embodiment of the present invention.

FIG. 28 is a waveform chart showing operation waveforms of respective units in FIG. 27.

FIG. 29 is an explanatory diagram showing an embodiment in which the invention is applied to a liquid crystal projector.

FIG. 30 is a side view showing a main part of a specific example of the biasing / deflecting means in FIG. 29;

FIG. 31 is a circuit diagram showing a main part of still another embodiment of the present invention.

FIG. 32 is a side view of still another embodiment of the present invention.

FIG. 33 is a top view of the embodiment shown in FIG. 32.

[Explanation of symbols]

1,2,3,4: unit projector unit, 5,6,7,
8: unit screen part, 9: seam, 11: Fresnel sheet, 12: front sheet, 13: black stripe, 14: lenticular lens, 16: lenticular sheet, 20: reinforcing sheet, 21: hole, 22: wire rod,
23: Spring, 24: Support member, 25: Hole, 31: Vertical front seat, 32: Screw, 41: Side hole, 42: Pin, 43: Shelf, 44: Interface, 45: Metal plate, 46: Screw , 47: z-direction displacement restraining metal plate, 4
8: hole, 49: pin, 50: L-shaped fitting, 51, 53: screw, 52: L-shaped fitting, 54: beam, 55, 56: prohibited area (effective projection light existing area), 57: free area (effective) 58: black point, 59: black line, 60: valley, 6
1: on-retinal profile, 62: repetitive pattern, 6
3: Profile on retina, 64: Projection light source, 65: Fresnel lens surface, 66: Prism / lens for overscan light energizing deflection, 67: Total reflection mirror for overscan light energizing deflection, 68: Side surface, 69: Diffusion sheet for biasing overscan light, 69-1: Lenticular lens for same as above, 69-2: Linear Fresnel lens for same as above, 69-
3: Same as above for compound lens, 71, 72: Activated light,
73: Linear Fresnel lens surface, 74: End prism
75, 76: limit light, 77: overscan light energizing / deflecting prism, 78: overscan light energizing / deflecting mirror, 79: overscan light energizing / deflecting element, 80: support member, 81: pin 42 falling off Preventing presser fitting, 82: one side pin, 83: welded part, 84: connecting member (metal plate), 85: pin, 86, 87: buckling waveform, 90: CR
T, 91: auxiliary deflection coil, 92: current detection resistor, 9
3: negative feedback amplifier, 95: adder, 96: energizing deflection pulse signal generator, 97: retrace pulse input or its waveform, 98: main deflection coil, 100: vertical deflection current waveform,
101: pulse signal, 102: composite waveform, 103: effective light section, 104: overscan section, 105: screen, 106: projection lens, 107: liquid crystal panel, 10
8: lamp, 109: mirror, 110: overscan light energizing deflection means, 111: CRT or liquid crystal panel, 1
12: gain controllable amplifier, 113: image signal input terminal, 114: pulse signal generator, 115: retrace pulse input, 125: projector, 126: screen, 12
7: longitudinal displacement absolute restraint means, 128: pillar member, 12
9: beam, 130: maintenance space, 131: floor, 13
2: Ceiling beam

Continued on the front page (72) Inventor Yukihiro Kobayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Engineering Co., Ltd. (72) Inventor Shoji Kuroda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Japan Information Video Inside the factory department (56) References JP-A-1-263634 (JP, A) JP-A-2-109032 (JP, A) JP-A-61-194433 (JP, A) JP-A-64-88531 (JP, A) (58) Fields surveyed (Int.Cl. ⁶ , DB name) G03B 21/62 H04N 5/74

Claims (5)

(57) [Claims] 1. A multi-screen projector comprising: a plurality of unit projector units; and an entire screen including a set of unit screen units at least functionally corresponding to each unit projector unit. In the unit, the longitudinal displacement restraint means for preventing the occurrence of displacement of the screen in the longitudinal direction is disposed in an effective projection light non-existent area that does not substantially hinder the projection light projected from the projector unit onto the screen , and The front-rear direction displacement restraining means is provided in adjacent unit spaces.
For the clean part, the phase of each unit screen part
Side holes are provided in adjacent side surfaces, and the side holes are
A multi-screen projector using the inserted pin means . 2. A plurality of unit projector units and each unit
A unit screen at least functionally corresponding to the projector
An overall screen consisting of a set of lean parts.
In a multi-screen projector, screens at left and right adjacent portions of the unit screen are provided.
Longitudinal displacement to prevent the longitudinal displacement of the
The bundle unit is projected from the projector unit to the screen.
Effective projection light non-existence area that does not hinder the projected light
, The arrangement and, then, the entire screen, a plurality of elongated screening
That are arranged side by side in the horizontal direction.
The longitudinal displacement restraint means is located on the left side of the vertical screen.
A buckling-resistant plate member disposed at the right end;
One end of the plate member is assigned to the end of the vertical screen, and the other end is assigned to the other end.
Position in the absolute fixed position.
And pin means for connecting at least in a fixed manner.
Multi-screen projector, characterized in that. 3. The multi-screen processor according to claim 2,
In the ejector, at least one of the pin means is commonly inserted into the side hole.
A multi-screen projector comprising the same pin means also serving as the inserted pin means . 4. The multi-screen processor according to claim 2,
In the ejector, the vertical screen includes a vertical reinforcing sheet and a vertical front.
Sandwiched between the sheet and both sheets
Fresnel sheet, the lowermost phase of a portrait screen
Fix the shelf means to the vertical reinforcing sheet at this position
The vertical front seat and the seat have a predetermined absolute
The wire member and the spring member stretched between the
And the longitudinal reinforcing sheet side through the Fresnel sheet
The component is pulled by
The gravity of the rack is fixed to the shelf
A multi-screen projector characterized by being supported by a step . 5. A plurality of unit projector units and each unit
A unit screen at least functionally corresponding to the projector
An overall screen consisting of a set of lean parts.
In a multi-screen projector, there is substantially no effective projection light on the entire screen.
Before constraining displacement of the screen back and forth in the area
A rearward displacement restraining means is provided, and the unit projector unit is
A stand for installation, and the unit projector unit
And the maintenance screen that humans can pass between the
A multi-screen projector characterized by a pace .