JPS61194433A - Constituting method for transmission type screen for large image surface - Google Patents

Abstract

PURPOSE:To observe with enjoy a large image surface without noticing any seam of plural transmission type screens by providing triangular prisms to the dead angle part of an incident light beam and connecting and supporting on them when the screens are arranged adjacently. CONSTITUTION:Transmission type screen units A1 and A2 which constitutes a screen for a large image surface are arranged adjacently, projectors L1 and L2 arranged at projection distance P, and an observer is positioned at observation distance D. In this case, the incident light beam has a dead angle O1C0O3=2alpha. Triangular prisms Ta whose vertical angle is <=2alpha are arranged in this dead angle space and the transmission type screen units A1 and A2 are connected and supported there-upon and screens are arranged at an upper and a lower, and a right and a left positions in the same structure to constitute the large screen. Consequently, none of screen seams is conspicuous and the large screen is observed without recognizing any screen seam.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling and configuring a transmissive projection screen used in projection televisions and various projection devices.
In particular, the purpose is to support the screen by specifying the shape and position of the pillars so that large-sized images do not obstruct the eyes.

(Prior Art) A conventional transmission type projection screen, for example, is equipped with a so-called one-piece sophrine, that is, a circular Fresnel lens lla on one surface and a lenticular lens on the other surface, as shown in FIG. The lens 12a is made of a molded body of a transparent synthetic resin with excellent optical properties, such as acrylic resin, vinyl chloride resin, styrene resin, polycarbonate resin, acrylonitrile/styrene copolymer resin, etc. It is known that the relative position of both lenses can be maintained accurately, and since the relative position of both lenses can be maintained accurately, the cost is low and it has been put into practical use.However, due to manufacturing technology, it is limited to a size below a certain size. It is something that

Furthermore, as shown in FIG. 0, a so-called two-piece screen is also known in which a Fresnel lens sheet 11b and a lenticular lens sheet 12b are each manufactured separately from the synthetic resin and are combined and laminated together. Although,
Since lenticular lens sheets have semicylindrical lenses, they are relatively easy to form into long lengths, but Fresnel lens sheets, like the one-piece sheet mentioned above, have a limit to the molding size, so there is a need for technology to fully utilize their optical properties. was not yet developed, so large screens were not put into practical use.

Currently, large-sized projection screens are desired for movies, televisions, etc.1 For example, in movies, images from 70M1N film are projected onto a large screen, and even in television images, a system called multi-screen is used. There is a method of arranging many screens to display a single screen.

For such screens, transmissive screens have a much higher utilization of projection light, and there is a greater degree of freedom in designing the directional distribution of the transmitted light flux from the projection screen surface toward the audience. The reflective screen has a characteristic feature such as a large dynamic range, but the dynamic range is narrow because the reflective screen produces an image that is identical to the print or print image, and even if the amount of projection light or irradiation light is increased to make it brighter. However, as the highlights become brighter, the dark areas also become brighter, which is in contrast to the wide dynamic range of color slide transparencies, which increases the dynamic range.

When making a large screen by combining such transparent screens, there are many issues regarding the materials used, processing machinery, ease of handling, transportation,
Appropriate unit sizes are used depending on factors such as transportation, assembly and installation methods, and these units need to be assembled to construct a huge structure.

(Problem to be Solved by the Invention) However, until now, when ordinary square or round timbers are used to support the joints, generally speaking, even if this support material is used on the incident side of the screen, the incident light flux cannot be controlled. As a result of blocking, the area left a strong impression as a seam, which prevented its practical use.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned circumstances, and it is possible to arrange a plurality of transmission screen units on the same plane or on the same circular arc curved surface in the vertical and/or horizontal directions. When arranging the screens so that they are adjacent to each other so that there is a seam to form one large screen screen, the blind spot of the light beam that enters the joint part of the screen is This method uses a triangular prism having an apex angle and/or a triangular crossbeam, which is provided close to the joint of the screen to support the screen.

(Function) A triangular prism with an apex angle less than the angle of the blind spot is used as a support or a triangular crossbeam in the blind spot of the transmissive screen, so vertical or horizontal joints are not displayed, and the large screen can be used to increase the awareness of joints. You can enjoy watching the screen without worrying about it.

(Example) Embodiments of the present invention will be described with reference to the drawings.

When arranging screen units horizontally in a straight line, the first
As shown in the top view of the figure and the perspective view of FIG. 2, 42 transmission screen units A□ are arranged and connected in the horizontal direction on the same plane.

In this case, the projector L□e L2 is adapted to send partial images to the respective screen units A1 and 4, respectively.

Each of the transmission screen units '1 + 8 * has a width W and a projection distance P (projection lens o11 o of the projector,
(distance between the transmission screen and the position Ox -04),
Viewing distance D (distance between the position 0*e C4 of the transmissive screen and the representative position AU of the intended viewer).

0! The point where the line connecting
Hahe.

), then s CI CI C2 is the horizontal line Y, Y, connecting the centers of the scree, and xl *
4 is a vertical line on the seam of the transmission screen units A11 and A2. Also, zs '% ha” through the above “s”
v ” is a line perpendicular to z and Yl vY2. When doing this, the projection angles of the projection lenses O8 and 0□ are respectively 2
α, AU viewing angle is 2γ, angles o, c, z,
== a, since there is an angle 03C0z1-αte, the blind space on the projector side is 2α, AUO,Z.

becomes the angle r.

Therefore, if the transmissive screen is connected and supported in the blind space using a triangular prism Ta having an apex angle of 2α or less, the screen can be supported without visual appeal to the joints of the transmissive screen units.

When arranging transmissive screen units vertically, 42 transmissive screen units A and A shown in the side view in Figure 3 and the perspective view in Figure 4 are arranged vertically on the same plane. Connecting.

In this case, the projector LH+ ``4'' sends a partial image to each screen unit ``s + Aa''.

Each transmission screen unit "s e Aa" has a height H and a projection distance P (projection lens of the projector 011 + o
s's and the position 012, 0□4 of the transparent screen), viewing distance D (position 0□2 of the transparent screen)
(distance between C14 and the planned representative location A[]) of the viewer.

The line connecting 012 * 014 is the transmission screen unit A
3 e The point that intersects with the edge of A4 is 01°, C11 and Cl2
(However, cmo is common to A3゜A4) when 0
11C10C□2 is a vertical line X11X12 connecting the centers of the screens. Yll Yl2 is the line on the seam of the transmission screen unit;

It is a line that passes through Z"+ % ha as. and is perpendicular to "111 xst and Yll + Yl2".

When doing this, the vertical projection angles of 011 and 012 are 2β, the viewing angle of AU is 2δ, and the angle is 01.
1 C1゜zll-β, angle O□3CI. 2□, -β, so the blind space on the projector side is 2β, AUO.

ztz becomes the angle δ. Therefore, the apex angle 2 is in the blind space.
If the transmissive screen is connected and supported using trigonometry Tt below β, the screen can be supported without visual appeal to the seams between the transmissive screen units.

Also, as shown in Fig. 5, 42
If the screens are arranged so that the centers of the screen units are on the same arc (radius D) from the representative viewer's position AU, and each projection m LX l "s is also projected at a projection distance P. , when the half-angle α of the projection light flux and the half-angle γ of the angle looking into the projection screen, a blind spot of 2 (α + γ) is created in the projection screen unit at the joint on the projector side of 4. Therefore, it has an apex angle of 2 (α + γ) or less. If a triangular prism Tc is used in this part, the joint of the screen can be supported without visual appeal.

In this case, it is of course possible to combine two triangular prisms having an apex angle of α+γ=φ in this part. Although not shown in the drawings, it will be easily understood that triangulation may be used when the transmissive screen units are arranged adjacently in the height direction in a similar arrangement.

Next, from the perspective of building materials, 900+uX1,
The size of 80Q+u is the upper limit in the standard, so if you make a silk screen of 90011JI vertically and 1,800mm horizontally and add it, its diagonal length will be about 21 pieces.

When using one projection device for one screen, the distance between the projection lens and the screen, that is, the projection distance, is generally equal to the diagonal length of the screen, so this is also about 2
,000 lit.

Based on this, the half angle α of the central angle of the projection light beam is the width of the screen W and the projection distance P, then jan, d = W/
It is on the 2nd floor.

Therefore, in the above example, tanα=1. s 00 /2
2. . . .

Therefore, α is approximately 24 degrees.

In the embodiments of the present invention shown in Figs. 1 and 2 (parallel to the optical axis), if α = 24 degrees, the blind angle is 48 degrees, and the triangular prism used here has a sufficiently wide angle so that it can be handled easily. It's easy.

Also, in the embodiment shown in FIG. 5, if α+γ-24 degrees,
48 degrees is the angle of a triangular prism, so this is also a sufficiently wide angle.

Further, in carrying out the present invention, a column whose cross section is a right triangle whose apex angle is angle α in the case shown in FIG. 1, angle β in the case shown in FIG. 3, and angle α+r−φ in the case shown in FIG. , or a combination of two girders is also fully possible.

Fig. 6 shows an example of a screen installed using the present invention, in which a triangular prism T is fitted at the joint part of the transparent screen unit '11''z, and a frame-like frame FI! is fitted to the other part. The T and the upper and lower frames are connected by a U-shaped connector C.

Note that this assembly example is of course just an example, but the tip of the triangular prism or triangular girder used in the blind spot may be rounded, or the #'! Using a triangular prism or triangular girder having an apex angle of be able to.

Next, the state of implementation using the method of the present invention will be described.

Taking the α and β angles in Figures 1 and 3 as mentioned above as an example, in the screen unit arrangement with the optical axis parallel, α or β
If it is 24 degrees, it is sufficient to use a triangular prism or a triangular girder with an apex angle of 24 degrees x 2 = 48 degrees, which is a sufficiently wide angle.

Furthermore, if the arrangement is on a circular arc surface as shown in FIG. 5, twice the r angle is added to this, so a triangular prism or triangular girder with a larger apex angle can be used.

Also, the above triangular prism or triangular girder is α or β or α10γ−φ
Alternatively, each screen unit can be surrounded by a frame with a right triangular cross section having an apex angle of β+δ=ω, and the frames can be assembled to form the entire screen.

Therefore, it is relatively easy to obtain structural materials for the frame that have sufficient strength, and it is also possible to construct a large screen that is completely unobtrusive to the audience.

Note that there is generally no need to consider the blind spots 2r and 2δ on the viewer's side in the crossbeam.

This is because in the case of a large screen, the height is usually smaller than the width.

Next, how can we make the seams of the screen less noticeable in appearance? This can be done by taking into account the limitations of the naked eye in discerning details. That is, the minimum value of the seam that can be seen with the naked eye is determined by multiplying this by the distance to the target, since the resolution of the naked eye is 00029. This example is displayed as follows.

Distance from the naked eye Resolution 250mg 0.07m500
〃 0.15'1.000" 0.!i '2.0
00" 0.6 "5.0 mouth 0"
1.21i o, o o o“
2.4 #20.000"
5.01 If the width is less than this dimension, it will not be an eyesore.

Therefore, in the present invention, the ridgeline of a triangular prism or triangular girder can be chamfered to the above dimensions.

Note that the dimensions of the triangular prism or triangular girder used in the present invention in the depth direction, that is, the height direction of the isosceles triangular cross section, can be arbitrarily selected, so that a sufficient depth size can be selected to maintain the required strength.

Next, when considering the total width of the integrated projection screen, it is generally considered appropriate that the viewing distance be approximately the same as y, so an example of this will be shown.

If the unit size projection screen has a width of 1.800111 and ten screens are lined up horizontally to make a total width of 18.000111, five screens are placed on each side of the center line of the entire screen on the right and left sides. Since the continuous display is arranged on the circumference of a circle whose radius is the standard viewing distance, in such a case, each screen has a projection device corresponding to it, and the projection device is 1 screen - 1. It is a projection device.

The projection lens and the standard audience are the viewing field lens (Fresnel lens) of the projection screen, and the action of the lenticular lens is that each image point formed by the projection lens becomes a secondary light source, and the design of the lenticular lens The distribution is dispersed accordingly.

screen This effect occurs over the entire surface of the projection screen.

It is possible to receive projection light beams in either direction.

Therefore, the audience can see an evenly bright screen.

FIG. 7 is an intensity vector diagram of the angular distribution of the dispersed light beam at each image point of the lenticule 2 lens, and in one example, the distribution angular range is at least 60' left and right.

V → Ochi 4L work 4L → Muzu's work - measurement video - mother's death 6 times → conclusion - ba 10, - 1 statue 1 each jfu] - 2 - kin 1 kin [ Therefore, the audience can see an equally bright screen.

In the figure, the length scale of the vector is the logarithm of the relative value of transmittance, and this can be said to indicate the brightness of the audience according to Lambertville's law of sensitivity.

The projection lens and the audience are in a conjugate relationship with each other through the field lens (Fresnel lens) of the screen. In other words, the standard audience will face all the unit screens. At the same time, the projection light flux is equally distributed to the left and right by the directional lenticular lens of the transmission screen.

The directivity of modern and improved transmissive screens is extremely wide, with some reaching as much as 60 degrees left and right (Figure 7). Therefore, the directional characteristics of the unit screen are also associated with the overall large screen, providing a large screen with high average brightness, high quality, and a rich sense of sensation to a large number of spectators distributed over a wide range centering on the standard audience during design. can do.

The total luminous flux from the projection optical system is not emitted outside the designed range. Therefore, if these are integrated with the utmost care, a large screen capable of projecting a large projection screen with an average luminous intensity distribution with little unevenness can be produced as needed.

Furthermore, compared to the large size of a single screen, the space occupied behind the screen, which is a disadvantage of a transmissive screen, can be reduced in depth. In other words, since the space occupied is the projection distance of the unit projection system, it is clear that in the case of a huge screen, this results in a great space saving.

In carrying out the present invention, it is of course possible to arrange the screen to be closer to a flat surface than the arcuate surface having the curvature shown in FIG.

(Effects of the Invention) According to the present invention, triangular prisms and/or triangular girders are used in the blind areas of the joints of the transmissive screen units, and the whole is assembled with push edges, and the screen joints are not seen at all from the viewer's side, so the frame is It is very easy to see without causing fatigue from looking at the frame, and it is possible to project while exchanging emotions with the audience, and it is also possible to show fast-moving images using a cinematic method. .

[Brief explanation of the drawing]

FIG. 1 is a top view of an embodiment of the present invention in which screen units are arranged horizontally in a straight line; FIG. 2 is a perspective view;
FIG. 3 is a side view of another embodiment of the present invention in which the screen units are arranged vertically in a straight line, FIG. 4 is a perspective view of the same, and FIG. FIG. 6 is a top view when screen units are arranged horizontally so that the centers of the units are equidistant from the viewer's position; FIG. Figure 7 is an intensity vector diagram of the angular distribution of the dispersed light beam at each image point of the lenticular lens, Figure 8 is a side view of a single piece,
FIG. 9 is a side view of the two-piece product. As + '* + As + A4... Transmissive screen unit W - Width ■ - Height P... Projection distance D... Viewing distance Lm, T-2, Lm I L4...Projector 01
＋On ＋0＋t＋On°゛Projection lens” ”
4 + 012 + 0□4... Center position of the transmission screen unit Ta Tc T... Triangular prism Tb - Triangular digit α... Horizontal center angle of the projection light beam Half-angle β・−
・・・−・Vertical direction ′r・・−・−・half angle of the angle looking into the unit projection screen (■δ・・・・・・−(
Slow F...--Image point 11b...-Fresnel lens sheet 12b...
...Lenticular lens sheet agent Patent attorney Bamboo
Uchi Mamoru Figure 7 Procedural Amendment (Voluntary) March 27, 1985 Manabu Shiga, Commissioner of the Japan Patent Office 1. Indication of the case 1985 Patent Application No. 34490 2. Title of the invention Structure of large-screen transmissive screen Law 3
Relationship with the case of the person making the amendment Patent Applicant Address: 10-6 Jujo Nakahara-chome, Kita-ku, Tokyo Name: You's 4 Agent Co., Ltd. 101 Address: 2-15-13-7 Uchikanda, Chiyoda-ku, Tokyo
Contents of the amendment As shown in the attached sheet (enter in the column for the subject of amendment (-
(No changes to the content except for the following) (1) From the end of the 13th line to the 14th line on page 4 of the specification, the phrase ``reflective screen'' has been corrected to ``on the other hand, the reflective screen''. . (2) Insert the phrase "as determined by this, that is, this" before the first character of line 7 on page 16 of the specification box. (5) Delete two lines from the bottom of page 15 of the specification. (4) On page 16, line 3 of the specification, the word "bill" is corrected to "beer." (5) On page 16 of the specification, line 3, insert the phrase [feel-1] next to "the audience". (6) Correct box 6 in the drawing as indicated in red on a separate copy. (Corrected the code C0 to C1°) Figure 3 Procedural amendment (voluntary) October 11, 1985 Director General of the Patent Office Michibu Uga 1 Display of case 1985 Patent Application No. 34490 2, Invention Name: Construction Method of Transparent Screen for Large Screens 3, Relationship with the case of the person making the amendment Patent Applicant Address: No. 3, Jujo Nakahara-chome, Kita-ku, Higashikibu Name:
You's 4 Agent Co., Ltd. 101 Address: 2-15-13-6 Uchikanda, Chiyoda-ku, Tokyo
As shown in Column 7 of Detailed Description of the Invention of the Specification Subject to Amendment, Contents of the Amendment (1) In the second line from the bottom of page 3 of the specification, "molding" is corrected to "molding". (2) In the third line from the bottom of page 3 of the specification, "not connected" is corrected to "not connected". (3) In the second line from the bottom of page 11 of the specification, “the triangular prism” is replaced with “
This triangular prism is corrected. that's all

Claims (3)

[Claims] (1) When forming one large screen by arranging multiple transmissive screen units adjacent to each other on the same plane or curved surface of the same circular arc so that there are vertical and/or horizontal joints, each screen A transmissive screen for a large screen, characterized in that a triangular prism or a triangular girder having an apex angle equal to or less than the blind spot of the light beam incident on the unit is provided close to the screen and the screen is supported by this. How to construct (2) When multiple projection screens are arranged on the same plane and the horizontal blind spot of the incident light beam is α and the vertical blind spot is β, a triangular prism with an apex angle of 2α or less and a triangular girder with an apex angle of 2β or less are projected. A method for constructing a large-screen transmissive screen according to claim 1, characterized in that the screen is used in a blind spot on the projection side of the screen to support the projection screen. (3) The centers of multiple projection screens are arranged on a constant circular arc surface with the central audience position as the axis, and the vertical direction of the half-angle of the central angle of the incident light beam is α, and the horizontal direction is β. ,
When the horizontal half-angle of the central angle looking into the projection screen is γ, and the vertical half-angle is δ, α+γ=φ, β+δ
The large screen according to claim 1, characterized in that the projection screen is supported by using a triangular prism and a triangular girder whose apex angles are equal to or less than a double angle of =ω in the projection side blind spot of the projection screen. How to construct a transparent screen for