JP5744638B2 - Display material - Google Patents

Description

  The present invention relates to a display member used as an advertising medium, a guide plate, or the like.

  2. Description of the Related Art Conventionally, as one of display means for advertisements and various types of guidance, there is a display member with a multi-surface display in which the display changes when the position of the observer relative to the display member changes. Specifically, for example, display members having a two-sided display are disclosed in Patent Documents 1 to 4. They have a pleated shape in which the cross section of the display member has a plurality of two continuous sides of the triangle, and the display is continuous when only one of the side surfaces is connected to the other side surface. The display is divided and arranged on each side.

  Patent Document 5 discloses a display member having a three-surface display. An example of such a display member is shown in FIG. 11A is a perspective view of the display member, and FIG. 11B is a schematic cross-sectional view taken along the line A-A ′ in FIG. The display member includes a flat surface 1 and a plurality of partition walls 2 standing on the flat surface 1 with a space therebetween, and is continuous with one side surface 3, the other side surface 4, and the flat surface 1 of the partition wall 2. The display is arranged. As a result, in FIG. 11B, when the display member is viewed while the observer moves from the left side to the right side of the drawing, the side surface 4 of the partition wall 2 is displayed, the flat surface 1 is displayed, and the side surface 3 of the partition wall 2 is displayed. Three different displays are observed in order.

Japanese Utility Model Publication No. 59-87094 Japanese Patent Laid-Open No. 51-126794 JP 2007-86656 A Utility Model Registration No. 3128909 Utility Model Registration No. 3128099

  In the display member of Patent Document 5, as shown in FIG. 11B, the partition wall 2 is provided upright with respect to the flat surface 1. Therefore, in FIG. 11B, when viewed from the center position Q of the front, the angle of the line of sight indicated by the broken line 10 is inclined as the distance from the center increases, and the partition 2 prevents the field of view. Become. As a result, the left and right displays as compared with the center cause a so-called crosstalk in which the displays of the side surfaces 3 and 4 of the partition wall 2 are mixed.

  In addition, when lighting is applied to the display member at night or the like, a large number of shadows are generated on the flat surface 1 by the partition wall 2 so that the display of the flat surface 1 becomes difficult to see, or in order to uniformly illuminate the three surfaces. There was also a problem that it was necessary to place lighting at the location.

  An object of the present invention is to solve the above-described problems and to reduce the influence of partition walls in a three-sided display member to improve display performance.

This onset Ming is a display member having an arcuate or parabolic concave surface section in the width direction, and at least three partition walls erected from the recess surface with a gap from one another, and
Different indications are provided on one side surface, the other side surface, and the concave surface of the partition wall,
In the cross section of the concave surface in the width direction, a straight line passing through the center of each partition wall passes through a reference point away from the partition wall, and the reference point is the center of a circle including the arc when the cross section of the concave surface is an arc. In the case of a parabola, it is the focal point of the parabola.

According to the present invention, by tailoring the angle with respect to the recess surface of the partition wall to the criteria points, observer can improve the display performance of the concave portion plane when viewed from the base reference point.

Further, only set the virtual reference point other than the reference point, by adjusting the angle to suit the portion of the septum to the virtual reference point, in one of the display member, it is possible to display that intentionally mix.

Furthermore, by making the concave surface light-transmissive, it is possible to illuminate from the back of the display member, and it is possible to illuminate the entire surface efficiently and evenly with less illumination, and display performance at night and in dark places Can be improved.

It is the perspective view and cross-sectional schematic diagram which show the structure of reference embodiment of the display member of this invention. It is a cross-sectional schematic diagram which shows the structure of other reference embodiment of the display member of this invention. It is a figure which shows an example of the display of each surface displayed on the display member of this invention. It is a figure which shows the state which divided | segmented the display of FIG. 3 so that it might correspond to each surface of a display member. It is the figure which combined the display which divided | segmented FIG. 4 according to the surface of the display member. Is a perspective view showing the structure of implementation mode of a display member of the present invention. It is a cross-sectional schematic diagram of embodiment of FIG. It is the perspective view and cross-sectional schematic diagram which show the structure of other reference embodiment of the display member of this invention. It is a figure which shows an example of the display of each surface displayed on the display member of FIG. It is a figure which shows the display displayed with the display member of FIG. It is the perspective view and cross-sectional schematic diagram which show the structure of the display member of the conventional 3 screen display.

(Embodiment 1)
Figure 1 is a diagram showing a configuration of a reference embodiment of Table radical 113 material of the present invention, FIGS. 1 (a) is a perspective view, (b) is an A-A 'sectional view of (a). As shown in FIG. 1, the display member of the present invention includes a flat surface 1 and a plurality of partition walls 2 provided upright from the flat surface 1 at intervals. Then, in a cross section in the width direction of the flat surface 1 (left and right direction in FIG. 1B, short direction of the flat surface 1), a straight line 5 passing through the center of the partition wall 2 is a virtual reference point away from the partition wall 2. The angle of the partition wall 2 with respect to the flat surface 1 changes stepwise from one side to the other side so as to pass through P.

  Here, the position of the virtual reference point P in the present invention is set to an appropriate position or an average position where the observer is considered to observe the flat surface 1. For example, in the case of outdoor advertisements or guidance, the observer is likely to stop at an intersection or the like, and a position where the advertisement is viewed for a relatively long time is set as the virtual reference point P. Further, when the observer always moves, the center of the display member may be set as the virtual reference point P.

  Further, in the present invention, the straight line 5 passing through the center of the partition wall 2 is a straight line passing through the center of the thickness in the case of a flat partition wall as shown in FIG. 1, and also shown in FIG. Thus, when the cross section of the partition 2 is a triangle, it is a straight line passing through the apex from the center of the base. In the present invention, the angle of each partition wall 2 with respect to the flat surface 1 is adjusted so that the straight line 5 passes through the virtual reference point P.

  In this way, by tilting each partition wall 2 corresponding to the virtual reference point P, when the observer observes the display member from the virtual reference point P, all flat surfaces 1 are observed without being obstructed by the partition wall 2. Will be.

  Therefore, if a predetermined display is provided on each of the flat surface 1 and the side surfaces 3 and 4 of the partition wall 2, the display provided on the flat surface 1 continues from the virtual reference point P and the side surface 3 of the partition wall 2. , 4 are observed without being mixed. Further, when viewed from the left side of FIG. 1B, the display provided on the side surface 4 of the partition wall 2 is observed, and when viewed from the right side of the paper surface, the display provided on the side surface 3 of the partition wall 2 is observed. The

  In the present invention, if there are at least three partition walls at the center of the display member and both left and right ends, three display changes on the flat surface 1, the left side surface of the partition wall 2, and the right side surface of the partition wall 2 are observed. Further, the end of the display member may be the flat surface 1 or the partition wall 2. In addition, a second flat surface may be provided on the apex (vertex on the virtual reference point P side) side of the partition wall 2 having a triangular cross section shown in FIG. 2 so that the cross section has a trapezoidal shape. In this case, a continuous display may be provided on the second flat surface and the original flat surface 1. In the case of a trapezoidal partition, the straight line 5 passing through the center is a straight line passing through the center of the lower base and the center of the upper base.

  In the present invention, the width of the flat surface 1 between the adjacent partition walls 2 is preferably constant for ease of manufacture. For example, the width of the flat surface 1 is gradually increased as the distance from the position closest to the virtual reference point P increases. By making it wider, the influence of the shielding of the partition wall 2 can be further reduced.

  The manufacturing method of the display member of this embodiment is demonstrated.

[Production Method 1]
The simplest method is a method in which the indications of the flat surface 1 and the side surfaces 3 and 4 of the partition wall 2 are continuously printed on a base material such as paper, and are folded and three-dimensionalized. The procedure will be described with reference to the drawings.

  Three types of display in FIGS. 3A, 3B, and 3C are displayed using the flat surface 1 and the side surfaces 3 and 4 of the partition 2. 3A is displayed on the side surface 3 of the partition wall 2, FIG. 3B is displayed on the flat surface 1, and FIG. 3C is displayed on the side surface 4 of the partition wall 2.

  As shown in FIG. 4, each display is divided into strips according to the width of the surface of the corresponding display member. FIGS. 4A, 4B, and 4C correspond to FIGS. 3A, 3B, and 3C, respectively. In FIG. 4, for the sake of convenience, the flat surface 1 and the side surfaces 3 and 4 of the partition wall 2 are all shown with a uniform width. FIG. 5 shows a state in which the display thus divided is arranged and synthesized in accordance with the order of the surfaces to be displayed. That is, the divided displays are arranged in the order of flat surface 1, side surface 4, side surface 3, flat surface 1, side surface 4, side surface 3. Such an arrangement of three displays is printed on a base material, or once printed on paper or the like as shown in FIGS. 3A, 3B, and 3C, FIG. As shown in (a), (b) and (c), it is divided into strips and attached to the substrate with an adhesive or the like in the arrangement of FIG.

  As the substrate, it is preferable to use a thin paper that can be easily bent, but a printable resin sheet such as a PET (polyethylene terephthalate) sheet or a polyvinyl chloride sheet may be used depending on the purpose of use. In particular, when the flat surface 1 constitutes a light-transmissive display member as will be described later, a resin sheet such as a PET sheet is suitable.

  As a printing means, an ink jet method using a roll sheet is suitable, but gravure printing or offset printing can also be used.

  Thereafter, the boundary between the flat surface 1 and the side walls 3 and 4 (broken line in FIG. 5) is valley-folded, and the boundary between the side walls 3 and 4 (dashed line in FIG. 5) is sequentially folded into mountain folds. 4 are bonded to each other on the back surface to form a partition wall 2, and the angle of the partition wall 2 with respect to the flat surface 1 is adjusted to obtain the display member having the configuration shown in FIG. When the side walls 3 and 4 are bonded together, a core material such as hard paper may be sandwiched between them, and the flat surface 1 is separately attached to a base material such as hard paper or resin plate after being three-dimensionally fixed. May be.

  Here, by adjusting the width of the side surfaces 3 and 4 in advance, each partition wall 2 can be inclined at a desired angle with respect to the flat surface 1 when the partition wall 2 is erected by bending. it can. Specifically, as shown in FIG. 2A, the width L3 of the side surface 3 and the width L4 of the side surface 4 as shown in FIG. Make a difference between long and short. For example, when the angle θ with respect to the flat surface 1 of the straight line 5 passing through the center of the partition wall 2 is 84 °, L3 is 30 mm, L4 is 30.1 mm, and the bottom surface width L1 of the partition wall 2 is 1 mm. Then, the partition wall 2 inclined toward the side surface 3 at an angle of 84 ° with respect to the flat surface 2 is obtained. As a whole, the width L1 of the bottom surface of the partition wall 2 is constant for all the partition walls 2, and the partition walls inclined at a predetermined angle after folding are set by printing L3 and L4 of each partition wall 2 according to the angle θ. 2 can be obtained.

  When using such a manufacturing method, it is possible to easily make a three-dimensional image by folding a printed material along the crease position mark by attaching a crease position mark at a position obtained by calculating a desired angle in advance. it can. In addition, when printing, a crease position mark is printed on the margin part or the back surface, and after printing, the printed matter is folded along the crease position mark with an automatic folding device or the like, so that three-dimensionalization can be performed with high accuracy. .

[Production Method 2]
After forming the base material having the structure of FIG. 1A or the cross section of FIG. 2A and printing the display as shown in FIG. 3, the printed material is divided into strips as shown in FIG. In this method, the divided printed matter is attached to each surface of the corresponding substrate. For the formation of the substrate, a mold having a corresponding cavity may be used and extrusion molding may be performed using a thermoplastic resin. Alternatively, a flat plate base material and a partition wall base material corresponding to each partition wall 2 are formed by extrusion molding of a thermoplastic resin or the like, and the partition wall base material is attached to the flat plate base material with a bolt or the like so as to be inclined at a desired angle. The angle of the partition wall substrate may be adjusted after the flat partition wall substrate is attached to the flat substrate.

(Embodiment 2)
Embodiment 1 shows a display member arranged on a flat surface such that the flat surface 1 is linearly arranged in the cross section in the width direction, as shown in FIGS. 1B and 2A. However, in the present invention, the display member arranged on the curved surface can be similarly configured.

  FIG. 6 is a perspective view of an embodiment of the second display member of the present invention, and includes a display member including a recessed surface 6 having a circular cross section in the width direction (short direction) and a partition wall 2. ing. FIG. 7 is a schematic cross-sectional view taken along the line A-A ′ of FIG. 6.

  In the present embodiment, the reference point R is the center of a circle including the arc of the cross section of the recessed surface 6. That is, the straight line passing through the center of the partition wall 2 is a normal line of a circle including the arc of the cross section of the recessed surface 6.

  In the present embodiment, the case where the cross section of the concave surface 6 is an arc is shown, but the cross section may be a parabola, and the reference point R in that case is the focal point of the parabola. Further, the cross section of the partition wall 2 may be triangular as shown in FIG. 2, but when the cross section of the concave surface 6 is an arc shape or a parabolic shape, the length L 3 and the side surface 4 of the side surface 3 of the partition wall 2. Are equal in length L4, and the cross-sectional shape of the partition wall 2 is an isosceles triangle.

  The present embodiment is basically the same as the configuration of the first embodiment except that the flat surface 1 of the first embodiment is the concave surface 6 and the reference point is the center of the arc or the focal point of the parabola. Therefore, if the number of the partition walls 2 is also at least three on the center part of the display member and the left and right ends, three display changes on the concave surface 6, the left side surface of the partition wall 2, and the right side surface of the partition wall 2 are observed. Further, the end portion of the display member may be either the recessed surface 6 or the partition wall 2.

  The manufacturing method of the display member of this embodiment is demonstrated.

[Production Method 1]
After manufacturing the printed material as shown in FIG. 5 in which the display of each surface is divided and synthesized as in the manufacturing method 1 of Embodiment 1, the side surfaces 3 and 4 of the partition wall 2 are bonded together as necessary. The entire surface is bent into an arc shape or a parabola shape so that the concave surface 6 has a predetermined curved surface. Further, if necessary, the concave surface 6 is attached to and integrated with a base material such as a predetermined arc-shaped or parabolic resin plate.

[Production Method 2]
As described in the manufacturing method 2 of Embodiment 1, a base material having a structure as shown in FIG. 5 is formed by extrusion molding of a thermoplastic resin, and a separately prepared printed matter as shown in FIG. 3 is divided as shown in FIG. The divided printed matter is affixed to each surface of the corresponding substrate.

  Moreover, as the base material, as described in the production method 2 of the first embodiment, a predetermined arc-shaped or parabolic curved base material and a partition base material corresponding to the partition wall 2 are extruded from a thermoplastic resin. It may be formed by molding, etc., and the partition wall may be attached to the curved base material so as to be inclined at a desired angle with a bolt or the like, or the flat partition wall base material may be attached to the curved base material and the angle of the partition base material may be adjusted. .

(Embodiment 3)
In the first and second embodiments, there is one virtual reference point P or reference point R for the display member. However, in the present invention, the virtual reference point P or reference point R for one display member. And the angle can be adjusted by adjusting a part of the partition wall 2 to each reference point. That is, in one display member, two or more areas having different virtual reference points P or reference points R can be mixed. When the display member is a predetermined arcuate or parabolic curved surface structure, one reference point R is the center of the circle and the focal point of the parabola, but the other reference point R is displayed by the observer. A position that is appropriate for observing the image is used as a virtual reference point, and the angle of each partition wall 2 may be adjusted so that a straight line passing through the center of the partition wall 2 passes through the virtual reference point.

  FIG. 8A is a perspective view of a configuration example in which two virtual reference points P are provided in the display member of FIG. FIG. 8B is a schematic cross-sectional view taken along the line A-A ′ in FIG. As shown in FIGS. 8A and 8B, the display member of this example includes a region 81 in which the angle of the partition wall 2 is adjusted corresponding to the virtual reference point P1, and a partition wall corresponding to the virtual reference point P2. And an area 82 in which the angle of 2 is adjusted. FIG. 9 schematically shows three displays displayed on the display member, where (a) shows the display of the side surface 4 of the partition wall 2, (b) shows the display of the flat surface 1, and (c) shows the partition wall. 2 schematically shows the display of the other side surface 3 of FIG.

  In the display of the side wall 4 shown in FIG. 9A, the five parts partitioned by the broken lines on the left half of the page correspond to the five side faces 4 of the partition wall 2 in the area 81, and the display shown by A is displayed. Has been. Further, the five portions partitioned by the broken line in the right half of FIG. 9A correspond to the five side surfaces 4 of the partition wall 2 in the region 82, and a display indicated by X is displayed. Further, the display of the flat surface 1 shown in FIG. 9B is such that the four parts partitioned by the broken lines on the left side of the paper correspond to the four flat surfaces 1 in the region 81, and the display indicated by B is displayed. Has been. Further, the four parts partitioned by the broken lines on the left side of FIG. 9B correspond to the four flat surfaces 1 of the region 82, respectively, and a display indicated by Y is displayed. One part partitioned by a broken line at the center is a flat surface 1 that is observed from either of the virtual reference points P1 and P2. Further, the five portions partitioned by the broken line in the left half of the drawing in FIG. 9C correspond to the five side surfaces 3 of the partition wall 2 in the region 81, and a display indicated by C is displayed. Each of the five parts partitioned by the broken line on the right half of the paper surface in (c) corresponds to the side surface 3 of the partition wall 2 in the region 82, and a display indicated by Z is displayed.

  FIG. 10 is a schematic diagram showing the display observed when each display shown in FIG. 9 is divided and pasted on the corresponding surfaces of the substrate having the structure of FIG. FIG. The left-right direction in FIG. 10 corresponds to the left-right direction in FIG. 8B, as shown in FIG. In FIG. 10, (a) shows the display of the region 81, (b) shows the region 82, and (c) shows which display is observed as a whole.

  As shown in FIGS. 10A, 10B, and 10D, when viewed from the left side of the leftmost side surface 4 on the paper surface, the display of A is displayed in the region 81, and the region 82 is displayed. An X display is observed. When the observer moves to the position corresponding to P1, the display of B is observed in the area 81 and the display of X is observed in the area 82. Further, at the position corresponding to P2 when the observer moves, the display of C is observed in the area 81, the display of Y is observed in the area 82, and further observed on the right side of the rightmost side surface 3 on the paper surface. When the person moves and observes, the display of C in the region 81 and the display of Z in the region 82 are observed.

  As the combined display of the areas 81 and 82, as shown in FIG. 10C, which is a combination of FIGS. 10A and 10B, when the observer moves from the left side to the right side of the page, A and A display in which X is arranged side by side, a display in which B and X are arranged in left and right, a display in which C and Y are arranged in left and right, and a display in which C and Z are arranged side by side are observed in this order. Depending on the position, the side surface 4 and the flat surface 1 and the flat surface 1 and the side surface 3 are mixedly displayed.

  8 to 10 show a configuration in which two regions having different virtual reference points are arranged in the width direction of the flat surface 1, but the present invention is not limited to this. For example, two or more regions having different virtual reference points may be arranged in the longitudinal direction of the flat surface 1, and two or more regions having different virtual reference points may be arranged in one region by the other region. May be. In this case, the shape of the other region may be any of a rectangle, a circle, and an indeterminate shape. Further, a plurality of the above arrangements may be combined.

(Embodiment 4)
In the first to third embodiments, the case where the longitudinal direction of the flat surface 1 is along the vertical direction and a different display is observed when the observer changes the position in the horizontal direction is described as an example. In the invention, a configuration in which the longitudinal direction of the flat surface 1 is arranged along the horizontal direction is also preferably used. Specifically, when an advertisement related to the wall of a building is placed in an outdoor advertisement, etc., and it is observed on an elevator that can be observed externally from a building that is placed opposite to the building with a road or the like sandwiched, Or the effect that the display observed by descending differs is acquired. Moreover, the effect that the partition 2 blocks the sunlight rays from above and the display of the flat surface 1 becomes easy to see is also obtained.

  Further, when the display member of the present invention is installed in a dark place indoors or when illumination is applied at night, the flat surface 1 of the display member is at least light transmissive so that illumination is applied from the back surface of the display member. Thus, it is possible to efficiently illuminate each surface without omission.

  In addition, it is possible to provide means for controlling or enhancing sunlight rays or light rays of illumination, such as installing a reflecting member, an antireflection member, a light diffusing member, or the like on the side surfaces 3 and 4 of the partition wall 2.

  The display content displayed on the display member of the present invention is not particularly limited, and can be freely selected according to the purpose, such as landscape, characters, design, solid color tone, and the like. It is also possible to leave the flat surface 1 transparent. When providing advertisements on the rear window of the bus, etc., if the flat surface 1 remains transparent and only the left and right sides of the partition wall 2 are displayed, the driver's field of view is visible when the driver observes through the rearview mirror. An advertisement can be provided without obstructing driving by obstructing.

  When the display member of the present invention is used outdoors, it is desirable to provide weather resistance and waterproofness. For example, “Scotch film (trademark)” manufactured by Sumitomo 3M Co., which is formed by laminating a release paper, an adhesive layer, and a resin layer. "Or printing on the bus wrapping film, and a printed matter relating to a separately provided base material can be pasted and used. Further, as a protection and antifouling measure, a transparent resin plate may be attached to the display side surface, or a transparent protective layer may be laminated.

  In addition, the display member of the present invention is provided with a mechanism capable of adjusting at least a part of the angle of the partition wall by remote control, so that it can be used in a time zone or a season even when installed on an inconvenient location such as a rooftop. Accordingly, the partition wall can be adjusted to an angle that is most easily observed, which is preferable.

  A display member having an A0 size (vertical × horizontal = 841 mm × 1189 mm) in which the longitudinal direction of the flat surface 1 is the vertical direction as shown in FIG. The virtual reference point P was set at a position 2 m in the normal direction from the center of A0. The width of the flat surface 1 was 3 mm, the width L1 of the bottom side of the partition wall 2 was 0.1 mm, the arrangement pitch of the partition walls 2 was 3.1 mm, and the total number of partition walls 2 was 384.

  The image data displayed on the flat surface 1 was divided into 383 pieces with a width of 3 mm. The display of the side surface 4 of the partition wall 2 is fixed to a width of 3 mm on the left side of the partition wall 2 from the horizontal central portion, and the image data is divided by changing the width stepwise from 3 mm to 3.029 mm on the right side of the sheet surface. did. Regarding the indication of the side surface 3 of the partition wall 2, contrary to the side surface 4, the width is fixed to 3 mm from the center in the horizontal direction to the right side of the paper, and the width is gradually increased from 3 mm to 3.029 m on the left side of the paper. The image data was divided by changing.

  The display data of each divided surface was synthesized so as to be repeatedly arranged in the order of the side surface 4 of the partition wall 2, the side surface 3 of the partition wall 2, and the flat surface 1 to create print data.

  Based on the print data, printing was performed on roll paper using an inkjet printer. The obtained printed matter is bent at the boundary between the side surface 4 and the side surface 3 of the partition wall 2 with a mountain fold, the boundary between the flat surface 1 and the side surface 4 of the partition wall 2 and the boundary between the side surface 3 of the partition wall 2 and the flat surface 1 with a valley fold. Then, the back surface of the flat surface 1 was pasted on a separately prepared A0 size mount so that the width L1 of the bottom surface of the partition wall 2 was 0.1 mm to obtain the display member of the present invention.

  When the display member is observed from a position 2 m away from the central flat surface 1, the display of the side surfaces 3 and 4 of the partition wall 2 is hardly observed in the entire display member, and the display of the flat surface 1 obstructs the partition wall 2. Observed clearly without being observed. Further, when moving 2 m from the center to the left and right, the display of the flat surface 1 was hardly observed, and the display of the side surfaces 3 and 4 of the partition wall 2 was clearly observed.

  In addition, a display member was manufactured in the same manner as described above except that the width of the side surfaces 3 and 4 of the partition wall 2 was fixed at 3 mm and all the partition walls 2 were set to stand upright with respect to the flat surface 1. When the display member is observed at a position 2 m away from the central flat surface 1, the display of the side surfaces 3 and 4 of the partition wall 2 is observed in the vicinity of both left and right ends, and the display of the flat surface 1 in the shadowed position of the partition wall 2 is displayed. Was not observed, and the displays of the side surfaces 3 and 4 of the partition wall 2 and the flat surface 1 were observed together.

  1: flat surface, 2: partition wall, 3, 4: side surface, 5: center line of partition wall, 6: concave surface, P, P1, P2: virtual reference point, R: reference point

Claims (3)

A display member having a concave surface having a circular cross section or a parabolic shape in the width direction, and at least three partition walls standing from the concave surface with a space between each other,
Different indications are provided on one side surface, the other side surface, and the concave surface of the partition wall,
In the cross section of the concave surface in the width direction, a straight line passing through the center of each partition wall passes through a reference point away from the partition wall, and the reference point is the center of a circle including the arc when the cross section of the concave surface is an arc. In the case of a parabola, the display member is the focal point of the parabola. The display member according to claim 1 , wherein the concave surface has light transmittance. Providing at least one virtual reference point other than the reference point, on the display member, provided with a straight line passing through the center of a portion of the partition wall is adjusting the angle of the partition wall so as to pass through the virtual reference point region display member according to claim 1 or 2, characterized in that.

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