JP2007298929A - Sectional spherical screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: the conventional spherical screen is large in size, transported with difficulty even in the case the screen is made small in size, and occupies the large storage space, and also, the screen is used only to project an image on one side, that is, the inside or the outside of the spherical screen. <P>SOLUTION: The spherical screen is obtained by joining polygonal sheets, a set of one support or a set of a plurality of coupling supports that can be curved with force and a belt-like bag constituted so that the support can be inserted from both ends thereof or the center thereof are attached to the screen, and a fixture capable of fixing the support is attached to the terminal end of the bag so that the screen may be formed to the spherical curved one. A white translucent material is used for the sheet. By having such the constitution, the screen can be assembled as necessary, and disassembled after use, the storage space is reduced, the whole weight is comparatively reduced, then, the screen is made easily transportable. Further, the image can be projected on both inside and outside surfaces of the spherical body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is an assembled spherical screen capable of projecting a photographed image or a computer graphics image on both the inside and outside of a spherical surface. The assembled spherical screen can be assembled before use, and can be carried after assembly. The present invention relates to an assembled spherical screen for storing and saving space.

Conventional spherical screens (Patent Documents 1 to 5) are large and fixed, but there are some which are made small in order to save space. There is also a dome as a creation, not as a spherical screen. Until now, it has been made of wooden and bamboo frames. (For example, there is a hemispherical dome composed of polyhedrons of 6 regular pentagons, 10 equilateral triangles, 30 isosceles triangles (A), 30 isosceles triangles (B). See.)
Patent No. 2916142 JP-A-6-148563 JP 2002-14611 JP 10-1111534 A Special table 2000-510206 Stardome homepage http: // www. stardome. jp

  The conventional spherical screen described above is generally large and difficult to move even if it is reduced in size, and is not an assembly type but an installation type. In addition, there is only a method of performing projection only on one side inside the spherical surface or outside the spherical surface.

  The present invention is intended to solve the above problems, and is intended to be easy to move, does not take up space during storage, saves space, and projects onto both the inside and outside of a spherical surface. is there.

  In order to achieve the above object, the present invention includes a spherical screen combined with a polygonal sheet and a single strut set that can be bent when a force is applied, or a plurality of struts that can be joined. A pair of bags and a belt-like bag that can be inserted and passed through from both ends or from the center are attached to the screen, and the post can be fixed to the end of the bag so that the screen has a spherical curve. A simple fixing tool is attached.

  In order to achieve the above object, the present invention uses a white and translucent material for the sheet.

  The operation of the first problem solving means is as follows. That is, a spherical screen can be formed by joining a support, passing it through a belt-like bag attached to the screen, and fixing the end while applying tension. Also, the storage space can be reduced by disassembling the assembled spherical screen, folding the seat, and dividing the joined struts. In addition, since the structure is simple, for example, cloth or vinyl is used as the material for the sheet, plastic (such as a horticultural pole) is used as the material for the column, and the overall weight is relatively light, making it easy to carry. be able to.

  The operation of the second problem solving means is as follows. That is, by using a white and translucent material for the sheet, it is possible to project an image on both the inside and outside of the sphere.

  As described above, the assembled spherical screen of the present invention can be moved while keeping its spherical shape when it is used by reducing the weight, and the storage space can be reduced by folding when disassembled.

  As described above, the assembled spherical screen of the present invention projects images on both the inside and outside of the sphere, so that from the inside of the sphere, for example, a live-action image with a sense of reality can be seen, It can be used as a planetarium, or can be used as, for example, a globe from the outside of a spherical surface.

By viewing the image from the inside of the spherical screen, it is possible to have an effect (a sense of reality) as if the observer is still there. This is related to the size of the projected image.
In addition, the image displayed on the spherical screen covers the viewer's field of view and has a wide angle that requires moving the eyes and head to capture the entire image. You can experience it (immersive feeling). This is related to the viewing angle of the projected image.

  As an example, a spherical screen can alternatively be used as a planetarium in a city area where there are many night lights in the vicinity of the observation, even if it is difficult to observe the starry sky or even if it is not observed using a planetarium facility.

  For example, by projecting landscape images of nature and cities around the world, you can have a simulated experience of being in that place. As an example, a three-dimensional structure can be understood by projecting a real object such as a building or a virtual model as an image.

  For example, it can be used as a globe by projecting satellite images while adjusting the position so that the position is accurately displayed on the spherical surface. In this case, compared with the conventional globe, there is no deterioration of the digital image as the display object, and the reproducibility is excellent. In addition, it is easy to edit. In this case, it is possible to mark on the globe and insert various images such as atmospheric circulation, ocean currents, earthquake and tsunami propagation, etc. It can be used.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a sheet for projecting an image as a spherical screen.
A white and translucent sheet is used to enable viewing of images from both the inside and outside of the spherical screen. Examples include white cloth, translucent polyethylene sheet, Japanese paper, and imitation paper. However, in use, it is necessary that the thickness of these sheets be strong enough to withstand the tension of the column. On the other hand, if the sheet is too thick, the spherical surface cannot be formed well even if the column is bent. Use a moderately thick sheet to form the spherical surface.

Reference numeral 2 denotes a pair of struts that can bend when a force is applied, or a pair of struts that can be joined. The strut is divided into a hemisphere upper part and a base part. Since the bottom support column is circular when assembled, at least one seam is required. When projecting an image, it is desirable that the support column be transparent and easily transmit light. An example of the material of the support is plastic (such as a gardening pole). For example, the cross section of the column may be a circle or a rectangle. Further, as an example, there are cases where two or three struts are joined to form the entire length. When joining the above, attach a pipe to the end of one of the columns. The tube shall be matched to the shape of the column. Examples include circles and rectangles. The tube shall not bend easily when force is applied. Moreover, if the width of the tube is the same as the width of the support column, it is difficult to connect and it is difficult to use. Also, if it is too large, it is difficult to fix and a curve for the spherical surface of the screen cannot be made. It shall have a slight clearance that does not hinder assembly. In the case of joining the above, for example, there is a use in which struts are connected with an elastic string (rubber string or the like) and folded.
To prevent the bag from being damaged during use, do not sharpen both ends of the column. As an example, it is conceivable to attach caps that pass smoothly through the bag at both ends. As an example of a method for fixing the columns to each other, there is a case where the columns are passed through a bag and fixed with a fixing tool. Further, as an example, there is a case in which a hemisphere upper support and a bottom support are fixed with a thumbscrew or the like.

Reference numeral 3 denotes a belt-like bag through which a support is passed. The support can be passed from both ends and the center. The bag is divided into an upper hemisphere and a bottom. The bags in the upper half of the hemisphere have a role of a guide that makes a three-dimensional intersection and makes it easier for the struts to intersect. The end of the upper hemisphere bag may be longer for fixation. For example, the bag may be attached outside the spherical surface or attached inside the spherical surface. When performing image projection, the bag is preferably white or transparent.
Necessary conditions for the bag are that there are no obstacles on the wall surface or inside of the bag so that the column can pass smoothly and larger than the width of the column, and that the inner surface does not use any material that causes adsorption or friction. Further, as an example, a case where a guide made of a material having a small friction coefficient is attached in order to smoothly pass the column. Further, in order to protect the bag, there may be a case where a protective sheet is provided on the inner surface of the end of the bag so that the support can pass smoothly. Moreover, the case where one side is closed among both ends of a hemispherical upper bag as an example can be considered. A three-dimensional intersection is provided at the portion of the bag where the struts intersect. It is necessary that the material does not bend easily and has a role of a guide that can bend so that the support can pass smoothly. For example, the same material as the bag, or a different material for this part may be used.

Reference numerals 4, 5, and 6 denote fixtures attached near the end of the bag.
To apply tension to the spherical screen, pull the tip of the upper hemisphere bag attached to the sheet, fix it with a fixture, and apply the tension evenly. As an example, there is a method of fixing the tip of the bag through a belt stopper or the like as in 4, 5. As an example, there is a method in which a hook or the like is attached to the outside of the end of the bag, and a receiving metal fitting such as the hook is attached to the outside of the bag from the center. As an example, there is a method in which a velcro tape or the like is attached and fixed to the outside at the tip of the bag and the outside from the center of the bag. As an example, there is a method in which a snap or the like is attached and fixed to the outside at the tip of the bag and the outside from the center of the bag. As an example, there is a method in which a stretchable string (rubber string or the like) is attached to the outside of the tip of the bag and a hook or the like is attached to the outside of the center of the bag to fix it. As an example, there is a method in which a ring or the like is attached to the outside of the tip of the bag, and a protruding metal fitting or the like is attached to the outside from the center of the bag. As an example, there is a method in which a metal fitting such as a thumbscrew is attached and fixed to the outside at the tip of the bag and the outside from the center of the bag. In addition, as in 6, there is a method of applying tension to the support by attaching a tube to both ends of the support and attaching a pin or the like to the bottom (sheet, etc.) of the spherical screen without using a bag or the like for fixing. In this case, the direction of the pin etc. can be changed, and the strength and length of the pin etc. are such that the tube does not easily come off from the pin etc. when tension is applied to the post, and the pin etc. can be easily seated It is necessary to have a bonding strength between the sheet or the like and the pin or the like that cannot be removed from the sheet.
Further, in each of the above-described fixing methods, there is also a method of replacing the position of the fixing tool.
Further, as an example, there is a method of attaching and fixing one belt and metal fittings between both bags instead of the plurality of belt metal fittings shown in 4. The belt needs to be wide enough to stop a plurality of struts and strong enough to fix the struts.
Further, as an example, instead of the plurality of belt brackets shown in 4, a plurality of strut supports having a width are attached between both bags, and further, a plurality of fixing tools and a seat, etc. There is also a method of fixing the support column by attaching the same number of fixtures to the fixture. The abutment tool needs to be wide enough to hold a plurality of struts and strong enough to fix the struts. Examples of the abutment tool include canvas and plastic.
When projecting an image, it is desirable that the one having a large area, such as a fixture such as a patch, be white or transparent.

  In order to construct an ideal spherical screen when the column is bent, the column material and width, the amount of tension required, and the sheet material and thickness are interrelated. These conditions necessary for the entire structure are determined comprehensively while adjusting the strength of each part.

The operation of the above configuration will be described below. A spherical surface of the screen is formed by passing a support through a belt-like bag attached to the screen, fixing both ends, and applying tension. Then, the height is adjusted by using a plurality of stands, and it is used as a spherical screen. Moreover, the storage space can be reduced by disassembling into one sheet and a short support.
Strictly speaking, the screen is composed of a polyhedron, but it can be used as a screen regarded as a sphere.
Since the folded sheet is tensioned when assembled, it functions as a spherical screen. In addition, the sheet can be temporarily uneven when pressed by hand, but when it is used, it does not apply any force other than tension or fixing force by a stand.

As an example at the time of assembly, when it is not necessary to connect the support columns, first, the support columns are inserted from either end of the bag so that the support columns protrude from both ends.
In addition, when it is necessary to connect multiple struts, as an example, insert struts from either end of the bag so that the struts joined to each bag enter an equal number so that the struts protrude at both ends. . In this case, if the column is a type in which the columns are joined at the center, a method of joining the columns, which are the respective parts, from the windows at both ends or the center of the bag in advance and then joining them at the center can be considered.

  After passing all the struts, the struts automatically cross each other at the intersection provided in the bag.

  Next, the support column protruding from the bag is pushed into the bag and fixed with a fixing tool. And it adjusts so that tension may become equal.

  The support frame for the bottom frame is inserted through the hole in the bottom of the sheet and passed through the bag attached to the bottom. Connect each support in the bag.

  The spherical screen thus assembled is fixed with three or more stands. Adjust the height according to the type of projection device. An image is adjusted so as to be projected onto a spherical screen according to the type of the projection device. As an example, the center of the hemisphere is the eye height, and the position is fixed with a plurality of stands. As an example of the stand, a fixture that can be adjusted in height and does not damage the seat (a clip with a spring, a screw fitting (plastic, wooden, etc.)) is used at the top.

In the case of a projection method using a combination of a convex mirror and a liquid crystal projector in Japanese Patent No. 2991642 (all-round spherical screen projection device), a fixed axis is placed in a diametric direction at a position lower than the center, and the convex mirror is placed inside the spherical screen. Therefore, the liquid crystal projector is fixed on the opposite side of the convex mirror near the center. Note that the height of the fixed axis, the convex mirror, and the position of the liquid crystal projector are adjusted so that an image can be projected on a spherical surface over a wide range.
Therefore, in this case, it is assumed that a plurality of observers are positioned away from the projection apparatus.

  In the case of a projection apparatus using a fish-eye lens as disclosed in Japanese Patent Application Laid-Open No. 2002-14611 (video projection method and apparatus for planetarium or spherical screen), the lens is located in the center, and light is emitted radially from the center. Therefore, in this case, it is assumed that a plurality of observers are located outside below the position of the central lens.

  As an example of image projection, there is a case where a celestial sphere image is projected inside a spherical screen and used as a planetarium. In addition, by projecting a landscape image, there are uses that give the impression of walking around the city and looking at the streets, or being in a place surrounded by mountains and the sea. In addition, the use of observing the celestial bodies (sun, moon, earth, etc.) as spheres in three dimensions using photographs of the surface of the sun and moon, photographs taken by artificial satellites, etc. is there. When using a convex mirror and a liquid crystal projector, the projection method differs depending on the projection device, such as predistorting the original image. Also, use a liquid crystal projector with sufficient light intensity so that it can be sufficiently observed when the room is darkened and the light emitted from the liquid crystal projector is projected onto a spherical surface.

It is a perspective view which shows a spherical screen main body. It is a front view which shows a support | pillar. It is a perspective view which shows the support | pillar which let the bag attached to the spherical screen main body, and the bag pass. It is a perspective view which shows an example of the fixing tool attached to the bag. It is a figure which shows an example of fixation of a support | pillar with the fixing tool attached to the bag. It is a figure which shows an example of fixation of a support | pillar which does not use a bag etc. for fixation.

Explanation of symbols

1 sheet 2 strut 3 tube 4 bag 5 fixture

Claims (2)

  The spherical screen has a spherical screen stitched with a polygonal sheet and a set of struts that can bend when a force is applied. A prefabricated spherical screen provided with a fixture for fixing the support column to the end of the bag so that the spherical screen has a spherical curve.   An assembled spherical screen characterized in that images are projected onto both the inside and outside of a sphere by using a white and translucent material for the sheet.

Images