JP5755477B2 - Reflective screen - Google Patents

Description

  The present invention relates to a reflective screen used for displaying an image by a liquid crystal projector, a laser projector or the like, and more particularly to a reflective screen useful when projection light of a projector is incident on a screen surface at a high elevation angle.

Conventional reflective screens are simply white matte, or general-purpose inexpensive types with diffused beads and pigments applied to the screen surface, and contrast performance in bright places with a striped external light absorption layer. There are various types of high-performance types that improve performance. For example, Patent Documents 1 and 2 disclose an example of a high-performance type reflective screen.
As projectors become smaller and more mobile, the projector's projection light on the reflective screen becomes higher in elevation, and contrast for reflective screens used in such situations, especially in bright places. There has been an increasing demand for improvement in brightness and uniformity of in-plane brightness with high brightness.

JP 2008-33217 A Japanese Patent Laid-Open No. 2006-23693

However, since the reflection type screens according to the prior art are both striped external light absorption layers (for example, in the case of the reflection type screens disclosed in Patent Documents 1 and 2, a horizontal stripe external light absorption layer), the contrast is reduced. There was a limit to the shielding and absorption of the outside light.
Thus, it has been desired to improve the shielding and absorption of external light in a reflective screen.

  In one aspect of the reflective screen of the present invention, a screen surface is formed by arranging a plurality of three-dimensionally structured cell elements in the horizontal and vertical directions. The cell element has a three-dimensional structure in which a cross section obtained by obliquely cutting a columnar body into a reflection surface is used as a reflection surface and an outer side wall surface is used as an external light absorption surface. A cross section of a cell row in which a plurality of cell elements are arranged in the vertical direction forms a sawtooth shape having a cut cross section (reflection surface) and a side wall surface. In the plurality of cell elements, adjacent cell rows are arranged with a phase difference having a length shorter than the height (vertical length) of the cell elements. In one cell element, since the cross section of the columnar body is a reflection surface and the side wall surface of the columnar body is an external light absorption surface, an external light absorption surface is formed around the reflection surface. By arranging a plurality of cell elements in alignment, a plurality of reflecting surfaces surrounded by the outside light absorbing surface are arranged. As a result, it is possible to improve the shielding and absorption of external light.

  According to one aspect of the reflective screen of the present invention, it is possible to improve the shielding and absorption of external light.

1 is an overall explanatory view (perspective view) of a projection system showing a positional relationship between a reflective screen and a projector according to Embodiment 1 of the present invention. 1 is a plan view of an entire projection system showing a positional relationship between a reflective screen and a projector according to Embodiment 1 of the present invention. 1 is a side view of an entire projection system showing a positional relationship between a reflective screen and a projector according to Embodiment 1 of the present invention. 1 is a front view of a reflective screen according to Embodiment 1 of the present invention. FIG. 3 is an enlarged perspective view showing an enlarged cell element constituting the reflective screen according to Embodiment 1 of the present invention. FIG. 2 is a front view and an end view of a cut portion showing an example of a cell element of a reflective screen according to Embodiment 1 of the present invention. 6 is a front view illustrating an example of a cell element of a reflective screen according to Embodiment 2. FIG. 6 is a cutaway end view illustrating an example of a cell element of a reflective screen of Example 2. FIG. It is a side view which shows the positional relationship of the reflective screen of Example 3, and a projector. FIG. 6B is a cut end view of a cell element in an arbitrary area indicated by “C” in FIG. 6A. FIG. 6B is an end view of a cut portion of a cell element in an arbitrary region indicated by “D” in FIG. 6A. It is the front view showing an example of the cell element of the reflection type screen of Example 4, and a cut part end elevation. It is sectional drawing of the cell row | line | column of the several cell element which gave AG process to the reflection type screen. It is sectional drawing of the cell row | line | column of the several cell element which gave AR process to the reflection type screen. It is a front view showing an example of the cell element of the reflection type screen which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. In the drawings, components having the same configuration or function and corresponding parts are denoted by the same reference numerals and description thereof is omitted.

Embodiment 1. FIG.
Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A to 1C are overall explanatory views of a projection system showing a positional relationship between a reflective screen and a projector according to Embodiment 1 of the present invention, and are respectively a perspective view and a plan view (viewed from above). , Represents a side view (viewed from the direction from the side). 1A to 1C show a reflective screen 1 having a horizontal width WS and a height (vertical length) HS. An example in which the reflective screen 1 is installed at a height DH higher than the horizontal plane (XY plane) where the projector 4 is installed, and the distance between the reflective screen 1 and the projector 4 is a distance DI. Show. Further, EL (elevation) represents the elevation angle (projection angle of the projector 4) of light incident from the projector 4 to the center of the reflective screen 1 (intersection of the width WH / 2 and the height DH / 2).

FIG. 2A is a front view of the reflective screen according to the first embodiment of the present invention, and FIG. 2B is an enlarged perspective view showing a part of a plurality of cell elements constituting the reflective screen. In FIG. 2B, the cell element contained in the arbitrary rectangular area | region of the reflection type screen 1 of FIG. 4A is expanded and represented.
FIG. 3 is a front view and a cutaway end view showing cell elements of the reflective screen. In FIG. 3, the front view which expanded and represented the some cell element 6 of the one part, the III (alpha) -III (alpha) cut part end elevation of a front view, and the III (beta) -III (beta) cut part end elevation of a front view are shown. In the front view of FIG. 3, the cell elements included in an arbitrary rectangular area of the reflective screen 1 are shown enlarged as in FIG. 2B. In FIG. 3, one cell element has a horizontal width WC and a height (vertical length) HC.

In the reflective screen 1 according to Embodiment 1 of the present invention, a plurality of cell elements 6 are arranged and arranged to constitute a screen surface (screen main surface). One cell element 6 (unit of the cell element 6) has a three-dimensional structure in which a cross section 7 obtained by obliquely cutting a columnar body is a reflecting surface 8 and an outer peripheral side wall surface 9 is an external light absorbing surface. The reflecting surface 8 is preferably a white white reflecting surface. Moreover, it is preferable that an external light absorption surface is a black external light absorption black surface.
In other words, the columnar body that constitutes the cell element 6 has a cut section 7 that is cut so that one end (one of the end portions of the columnar body) is an inclined surface, the cut section 61 is the reflective surface 8, and the side The wall surface (outer periphery of the column surface) 62 is an external light absorbing surface. For example, one of two parallel planes (bottom surfaces) of a column (including a polygonal column and a cylinder) is cut so as to have an inclination, and an end surface having an inclined surface as a cut surface is formed.

  The reflection surface 8 constituting the cell element 6 is a reflection surface for projector projection light, and is provided with an appropriate inclination angle θv with respect to the vertical direction with respect to the projection angle of the projector 4 with respect to the reflection type screen 1. On the other hand, the side wall surface 9 of the cell element 6 is provided with a black coating on the side wall surface 9 for absorbing outside light causing a decrease in contrast, or is a black pigment ground. Embodiment 1 demonstrates the case where the reflective surface 8 gave the coating of the white reflective layer, and the side wall surface 9 becomes the black pigment | dye ground. For this reason, the side wall surface 9 and the black external light absorption layer are shown as being the same. The production of the reflecting surface 8 and the external light absorbing surface will be described later.

The plurality of cell elements 6 are aligned in the horizontal direction (row) and the vertical direction (column).
A cross section in the column direction of a cell row composed of a plurality of cell elements 6 arranged in the vertical direction (IIIα-IIIα cross section, IIIβ-IIIβ cross section in FIG. 3) is a cut cross section (inclined surface) 7 and side wall surface (ineffective surface A rising edge) 9 is formed in a sawtooth shape in which the surfaces are alternately continuous. In addition, adjacent cell rows are aligned with each other with a phase difference of ½ of the height HC of the cell elements 6.

The reflection surface 8 of the cell element 6 has an inclination angle θv with the screen surface (YZ plane). In other words, the inclined surface of the columnar body constituting the cell element 6 is formed so that the inclination angle θv formed by the reflecting surface 8 and the screen surface is in an appropriate range.
The inclination angle θv of the reflecting surface 8 of the cell element 6 does not need to be a constant value, and the reflected projection light can be controlled to be parallel or lower by reducing the inclination angle θ toward the lower side of the screen. The inclination angle θv is preferably 20 ° or more and 40 ° or less.
Moreover, you may add the function to change the directivity of reflected light by making the reflective surface 8 concave. That is, by appropriately adjusting the directivity of the reflected light, it is possible to efficiently direct image light that is too wide in the up / down / left / right directions in the direction in which the observer exists.

  As described above, the reflective screen 1 of the present embodiment has the following advantageous effects by arranging the plurality of cell elements 6 in an aligned manner. For example, a reflective screen according to the prior art is provided with a striped external light absorption layer, whereas in the reflective screen 1 according to the present invention, not only external light incident from above is caused by a plurality of cell elements 6. The external light incident from the lateral direction is efficiently absorbed. As a result, the contrast can be further improved.

  Since the reflective screen according to the present invention has the advantageous effects described above, it is a reflective screen on which the projection light of the projector enters the screen at a high elevation angle, and has a small size of about 20 to 40 inches for business use. It can be applied to any reflective screen.

Next, an outline of the manufacturing method of the reflective screen according to the first embodiment of the present invention will be described below. The mold necessary for the reflective screen can be easily obtained by using a conventional technique in which a resist mold is obtained by laser engraving a resist material and a Ni electroforming stamper is manufactured from the master mold.
The reflective screen may be manufactured by using a stamper mold with a thermoplastic resin such as polycarbonate (PC) or polymethyl methacrylate resin (PMMA) by an injection molding method, or a film-like material obtained by extrusion molding. The surface may be shaped by a thermal transfer method, or the shape may be transferred using a UV curable resin to a base film such as polyethylene phthalate (PET).

  Here, in any of the manufacturing methods described above, there are two methods depending on the combination of the reflective material and the external light absorbing material. Specifically, (1) after forming a base shaped film with a resin containing a white reflective material, and then applying a black layer to be an external light absorbing layer in the next step, on the contrary, (2) In some cases, a white reflective layer is applied after a shaped film as a base is formed with a resin containing a black extraneous light absorber. The black layer in the former method can be applied by, for example, scraping printing, and the white reflective layer in the latter method can be applied by known techniques such as spray coating and ink jet coating. . For example, FIG. 3 shows a case of manufacturing by the method (2) described above.

  The reflective screen according to the present invention can be enlarged in area by tiling a stamper, and the stamper is formed into a shaping roll by winding a roll, and a roll-to-roll by a thermal transfer method or an ultraviolet curing method is used. Continuous production in rolls is also possible.

Embodiment 2. FIG.
Although the case where the columnar body constituting the cell element 6 of the reflective screen 1 has a square plane (cross section) has been described, it is not limited thereto. For example, a quadrangular prism having a square or rhombus plane can be used. The shape of the planar surface of the columnar body may be any other shape as long as adjacent cell rows can be arranged in alignment with each other with a half phase difference of the vertical length of the cell element 6.

Embodiment 3. FIG.
The reflective screen 1 described in each of the above embodiments has a basic type in which a plurality of cell elements 6 are arranged in a horizontal / vertical direction, and a transparent resin containing a transparent resin or a light diffusing material on the surface of the cell elements 6. By filling the surface with a flat surface, it is possible to prevent adhesion of dirt to the recess. In addition, it is possible to suppress hot bands and improve contrast performance by subjecting the obtained flat surface to AG (Anti Glare) processing (for example, processing to make it an embossed surface) or AR (Anti Reflection) processing. become.

  In the case of performing AG treatment or AR treatment, a reflective screen is manufactured by embedding a transparent adhesive material in the uneven surface of the reflective screen to form a flat surface, and further, a functional film subjected to AG treatment or AR treatment is flat. It can be easily obtained by pasting to.

Other embodiments.
In each of the above-described embodiments, the case where the side wall surfaces 9 of the plurality of cell elements 6 are in contact with each other has been described. However, when the cell elements 6 are arranged and arranged, a gap is generated between the cell elements 6. There may be. For example, the column surface may be another polygon, a curved surface, or a combination of a curved surface and the like, and the gap between the cell elements may be filled with resin. On the other hand, considering the coating of the reflective material (the base is a black resin), the external light absorbing material embedded coating (the base is white, the reflective material kneaded resin), or the mold preparation, the shape of the cell element is A simple shape is preferred.

  Specific examples of the screen surface and the cell elements will be described later with reference to FIGS. 3 to 7B. In addition to these, for example, even when the cell elements 6 are aligned as shown in FIG. Good. In FIG. 8, the cells are formed such that the shape in which the plurality of cell elements 6 are arranged in the vertical direction (the shape of the side surface of the cell row composed of the plurality of cell elements 6) is planar (the shape that forms one plane). An example in which elements 6 are arranged in alignment is shown. In this case, each cell element 6 may be rectangular or square. Further, although the horizontal width (WC) of each cell element 6 is the same in one cell row, the height (HC) may be the same or different. For example, one cell row may be a combination of rectangular cell elements 6 and square cell elements 6 having the same width (WC). Between a plurality of cell rows, the width (WC) of the cell elements 6 may be the same length or different lengths, but the width (WC) of the cell elements 6 in one cell row is It will be the same length. Furthermore, the phase difference of the cell elements 6 can be set flexibly by making the side surfaces of the cell rows planar. In the example illustrated in FIG. 8, the cell element 6 may use another shape in which the shape of the side surface of the cell row is planar.

  Below, the specific example of the reflection type screen which concerns on this invention is demonstrated.

[Example 1]
In this embodiment, a hexagonal column is used as the columnar body, and the inclination angle θv of the reflecting surface 8 is 40 ° (constant). The configuration of the cell element 6 is the same as in FIG.
[Example 2]
In Example 2, the reflecting surface 8 of Example 1 is a concave reflecting surface. FIG. 4A is a front view illustrating an example of a cell element of the reflective screen of Example 2, and FIG. 4B is an end view of the IV-IV cut portion. As shown in FIGS. 4A and 4B, the cut section 27 of the cell element 6 is formed as a concave curved surface, and a white reflective layer is applied along the shape of the cut section 27 to form the reflecting surface 28. By making the reflecting surface 28 concave, the directivity of reflected light can be adjusted. Thereby, it becomes possible to easily change the directivity of the reflected light according to the application of the reflective screen 1.

Example 3
Example 3 is a case where a hexagonal column is used as the columnar body, and shows a case where the angle of the cut section of the cell element changes depending on the height from the bottom of the reflective screen.
FIG. 5A is a side view showing the positional relationship between the reflective screen of Example 3 and the projector (an arrow view from the lateral direction), and FIG. 5B is a diagram of cell elements in an arbitrary area “C” in FIG. 5A. It is a cutting part end view. FIG. 5C is a cutaway end view of a cell element in an arbitrary area of “D” in FIG. 5A. The cut section of the cell element is cut in the same manner as in FIG.
The inclination angle θv of the reflection surface 38 is such that the inclination angle θvc at the upper part of the screen (arbitrary area “C”) is 40 °, and the inclination angle θv decreases gradually toward the lower part of the screen. In the region, the inclination angle θvd is 20 °. That is, the inclination angle is in a relationship of θvc> θvd.
In addition, in FIGS. 5B and 5C, a shaded portion is shown at the top of the side wall surface 39. This indicates a region where the reflection surface 38 of one adjacent cell element does not reach the reflection surface 38 of the other cell element because the reflection light from the projector 4 is blocked.
Example 4
Example 4 is a case where a square column (diamond) is used as the columnar body. FIG. 6 is a front view and an end view of a cut portion showing an example of a cell element of the reflective screen of Example 4. 6, similarly to FIG. 3, an enlarged front view of a part of the plurality of cell elements 46, an end view of the IVα-IVα cut portion of the front view, and an end view of the IVβ-IVβ cut portion of the front view, Indicates.
The inclination angle θv of the reflecting surface 48 is 40 ° (constant). Also in FIG. 6, the cross section of the cell row in which a plurality of cell elements 46 are arranged in the vertical direction forms a saw blade shape composed of a cut cross section (reflection surface 48) and a side wall surface 49. Also. Adjacent cell rows are arranged with a phase difference having a length shorter than the height of the cell element 46.

Example 5
Example 5 is a case where AG processing or AR processing is performed on a reflective screen. FIG. 7 is a cross-sectional view of a cell row of a plurality of cell elements obtained by performing AG processing or AR processing on a reflective screen. Specifically, after applying the transparent adhesive material 10 on the surface of the reflective screen (same as Example 1) composed of the cell elements shown in FIG. The cross section of the cell row | line | column when optical functional films, such as AG film 11 and AR film 12, are bonded to a flat part after filling with a transparent extending material) is represented.

  As an example of the size when the screen surface of each of the above embodiments is applied to business use, as an example, the screen size is 20 to 30 inches, the screen aspect ratio is 3: 4: 5 normal type, and the cell element size is 30 μm. A screen surface of about 100 μm is assumed.

  In addition, this invention is not limited to embodiment shown above. Within the scope of the present invention, it is possible to change, add, or convert each element of the above-described embodiment to a content that can be easily considered by those skilled in the art.

1 Reflective screen 4 Projector 6, 26, 46 Cell element 7, 27 Cut section 8, 28, 38, 48 Reflective surface 9, 29, 38, 49 Side wall surface (all are external light absorbing surfaces)
10 Transparent adhesive material 11 AG film 12 AR film X Vertical direction where the projector is located Y Horizontal direction of the screen surface Z Vertical direction of the screen surface WS Horizontal width of the reflective screen HS of the reflective screen Height (vertical length)
DI Distance between the reflective screen and the projector EL Height of the projector DH with respect to the center of the screen surface Height between the projector position and the bottom of the reflective screen WC Cell element width HC Cell element height (vertical length)
θv, θvc, θvd Angle of inclination between screen surface (YZ plane) and reflecting surface

Claims (8)

A screen surface is formed by arranging a plurality of three-dimensional cell elements in the horizontal and vertical directions,
The cell element has a three-dimensional structure in which a cross section obtained by obliquely cutting a columnar body is a reflective surface, and an outer side wall surface is an external light absorbing surface.
A cross section of a cell row in which a plurality of the cell elements are arranged in the vertical direction forms a saw blade shape having a cut cross section and a side wall surface, and adjacent cell rows are of a length shorter than the height of the cell element. A reflective screen arranged with a phase difference.   2. The reflective screen according to claim 1, wherein the adjacent cell rows are aligned and provided with a phase difference of a half of the height of the cell elements. Reflective screen according to claim 1 or 2, wherein the reflective surface is concave. Before Kihan reflecting surface forms the inclination angle θv with the screen surface, reflection-type screen according to any one of claims 1 to 3, characterized in that in the range of 20 ° to 40 °. 5. The reflective screen according to claim 4 , wherein the inclination angle θv is larger in a cell element far from the bottom than in a cell element near the bottom of the screen surface.   The reflective screen according to any one of claims 1 to 5, wherein the columnar body has a hexagonal or quadrangular cross section.   The uneven portion of the screen surface is filled with a transparent resin or a transparent resin containing a light diffusing material to form a flat surface, and the flat surface is antiglare treated. Reflective screen.   The uneven surface portion of the screen surface is filled with a transparent resin or a transparent resin containing a light diffusing material to form a flat surface, and the flat surface is subjected to an antireflection treatment. Reflective screen as described in 1.

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