JP5630279B2 - screen - Google Patents

Description

  The present invention relates to a screen.

2. Description of the Related Art Conventionally, there is known a screen that reflects an image (projection light) projected from a projector to an observer located on the front side and displays the image. As such a screen, there is known a screen in which concave or convex unit shape portions are regularly arranged on the front surface on which an image is obliquely projected from the lower side (see, for example, Patent Document 1).
In the screen described in Patent Document 1, a reflective film (reflective layer) is provided on a portion of the surface of the unit-shaped portion where the projection light is incident, whereby the incident projection light is transmitted to the front of the screen. It has the structure which reflects in a direction (namely, observer side).

JP 2009-192871 A

  However, in the screen described in Patent Document 1, a region (effective reflection region) that appropriately reflects the projection light obliquely incident on the surface of the unit shape portion from below onto the surface of the unit shape portion in the front direction of the screen where the observer is present. And other areas. For this reason, it is desired to increase the luminance of the displayed image by securing a large number of the effective reflection areas.

  An object of this invention is to provide the screen which can achieve high brightness.

  The screen of the present invention is a screen having an incident surface on which light for forming an image is incident, and the incident surface has a reflection region for reflecting the light, and the incident surface and an extension of the incident surface. A plurality of concave surface portions respectively formed along a plurality of substantially circular rows centering on a reference point on any one of the surfaces, and a row closest to the reference point among the plurality of rows Is formed along an elliptical orbit having a long side in a direction along a virtual reference line connecting the reference point and the center point of the incident surface.

  According to the present invention, since the column closest to the reference point is formed along an ellipse (vertical ellipse) orbit having a long side in the direction along the virtual reference line, the long side direction of the vertical ellipse in the same column Since the size of the concave portion in the end portion (near the reference line) can be reduced, the concave portion can be densely arranged in the vicinity of the reference point.

Further, when such a row of concave portions is set from the reference point, the inclination angle between the direction perpendicular to the reference line and the tangent of the row of concave portions becomes large at the corner of the screen. Thus, as in the case described above, the size of the adjacent concave surface portion can be reduced in the direction along the row of the concave surface portions while ensuring the effective reflection area at the corners of the screen. Can be placed.
Therefore, since the concave surface portion can be densely arranged on the entire incident surface, a large effective reflection area on the incident surface can be secured and a large amount of projection light can be reflected to the front side of the screen, so that the screen can be made brighter. Can do.

  In the present invention, when the predetermined position on the incident surface is defined by an angle formed by the reference line, the reference point, and a virtual straight line passing through the predetermined position, the reference point is the center. It is preferable that the pitch of the concave surface portion in the radial direction increases as the angle increases.

Here, when the incident light is obliquely incident on the screen and the range reflected by the screen is widened in the left-right direction to improve the convenience of the observer, the effective reflection area of the concave portion is It becomes horizontally long in the concave portion at any position. The planar shape of the concave portion viewed from the front of the screen is inclined as the angle increases. As the planar shape of the concave surface portion is inclined, the distance between the center positions of the concave surface portions is increased in order to ensure a horizontally long effective reflection region.
On the other hand, according to the present invention, since the pitch of the concave portions in the radial direction increases as the angle increases, the projection light can be efficiently advanced toward the front of the screen.

In the present invention, the elliptical orbit of the row of concave portions increases in a direction perpendicular to the reference line on either the incident surface or the extended surface of the incident surface as the row moves away from the reference point. It is preferable to become.
According to the present invention, the elliptical orbit of the row of concave portions increases in the direction orthogonal to the reference line on either the incident surface or the extended surface of the incident surface as the row moves away from the reference point. By doing so, similarly to the case where the pitch of the concave surface portion is increased as the angle increases, the projection light can be efficiently advanced toward the front of the screen.

In the present invention, it is preferable that another concave surface portion is formed between the rows of the concave surface portions adjacent to each other in the radial direction around the reference point.
According to the present invention, by forming another concave surface portion between the rows of concave surface portions adjacent to each other in the radial direction centered on the reference point, even when the incident angle of the projection light with respect to the incident surface is small, Since the projection light can be incident on the concave surface away from the reference point, a large effective reflection area on the incident surface can be secured, and the projection light is reflected over the entire necessary range on the front side of the screen, so that the field of view of the screen A corner can be secured.

The front view which shows typically the screen which concerns on one Embodiment of this invention. The enlarged view which shows a part of entrance plane in the said embodiment. The enlarged view which shows a part of entrance plane in the said embodiment. The graph explaining the transition of the substantially circular shape in the said embodiment. The figure which shows typically a part of screen in the said embodiment. The figure which shows typically a part of screen in a comparative example. The figure which shows the shape of the concave part in the said embodiment. The figure which shows the shape of the concave part in the said comparative example. The figure which shows the shape of the concave part in the said embodiment. The figure which shows the shape of the concave part in the said comparative example. The figure which shows the shape of the concave part in the said embodiment. The figure which shows the shape of the concave part in the said comparative example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Overall screen configuration]
FIG. 1 is a front view schematically showing a screen 1 according to the present embodiment.
The screen 1 according to the present embodiment mainly reflects an image incident obliquely from a projector (not shown) disposed below the front side of the screen 1 to the front side of the screen 1 to display the image. To do. As shown in FIG. 1, the screen 1 is formed in a substantially rectangular shape when viewed from the front.
The incident surface 11 that is the front surface of the screen 1 is a surface that reflects the light (image forming light) incident from the projector, and the concave surface portion 2 (FIGS. 2 and 3) is formed on the incident surface 11. Has been.

(Concave surface configuration)
2 and 3 are enlarged views showing a part of the incident surface 11. In other words, FIG.2 and FIG.3 is the perspective view which looked at the concave part 2 from the front side. Specifically, FIG. 2 shows the concave surface portion 2 formed at a position near the reference point A shown in FIG. 1, and FIG. 3 shows the concave surface portion 2 formed at a position far from the reference point A. The reference point A is a reference point when determining the formation position of the concave surface portion 2 with respect to the incident surface 11. In the present embodiment, the reference point A is set on the extended surface of the incident surface 11 as shown in FIG. For example, the reference point A is set according to the installation position of the projector.

As shown in FIGS. 2 and 3, a plurality of concave surface portions 2 (concave surface portions 2 </ b> A and 2 </ b> B) are two-dimensionally densely formed on the incident surface 11. A reflection layer 21 (reflection area) that reflects light is formed at a position on the surface of the concave portion 2 where the projection light from the projector is incident. As described above, the reflective layer 21 formed on the concave surface portion 2 reflects the projection light from the projector toward the observer on the front side of the screen 1. Specifically, the reflection layer 21 is an effective reflection region on the surface of the concave portion 2 (a region that appropriately reflects the incident light obliquely incident on the screen 1 from below in the front direction of the screen 1 where the viewer is present). Formed.
The reflective layer 21 is formed, for example, by applying a highly reflective white paint on the surface of the incident surface 11 by spraying or by depositing aluminum or silver obliquely. It should be noted that the portion of the surface of the concave portion 2 other than the reflective layer 21 is configured to absorb light, such as being formed in black, so that light from a fluorescent lamp that is obliquely incident from above the screen 1 or the like. The reflection of outside light can be prevented.

(Arrangement of concave surface)
Here, the position where the concave surface portion 2 is formed will be described in detail.
As shown in FIGS. 1 to 3, the entrance surface 11 is formed with concave surface portions 2 </ b> A so as to be adjacent to each other along a plurality of substantially circular rows M around the reference point A (FIG. 1). ing. Specifically, as shown in FIG. 2, the concave surface portion 2 </ b> A is formed on the circumference of the substantial circle (on each row M). In addition, the concave surface portion 2A is formed so as to be adjacent to each other also in the radial direction D centering on the reference point A. In addition to “circle (true circle, perfect circle)”, the approximate circle includes shapes deformed based on “circle” (for example, “ellipse” and “free curve”, as well as these Combination). Furthermore, the combination of the curve (for example, circular arc) which comprises "ellipse" and "free curve", and a straight line is included.
Here, at a position far from the reference point A of the incident surface 11, another concave surface portion 2 </ b> B is formed between the rows M of the concave surface portions 2 </ b> A adjacent to each other in the radial direction D, as shown in FIG. 3. That is, the concave surface portion 2A is formed along each row M, and another concave surface portion 2B is formed between the concave surface portions 2A in the radial direction D along the other row M1 along the row M. . A pair of concave surface portions 2 </ b> A and concave surface portions 2 </ b> B adjacent to each other in the radial direction D constitute a long concave portion along the radial direction D. 3 is a boundary portion between the concave surface portion 2A and the concave surface portion 2B in the concave portion.

  As shown in FIG. 1, among the plurality of rows M, the row M closest to the reference point A is a direction along a linear virtual reference line B connecting the reference point A and the center point 11A of the incident surface 11. Are formed along a longitudinal elliptical orbit having a long side. In addition, the diameter of the plurality of rows M in the direction along the imaginary straight line C orthogonal to the reference line B gradually increases as the distance from the reference point A increases. The row M formed by the concave surface portion 2 located on the upper end side of the incident surface 11 is formed along a horizontally long elliptical orbit having a long side in the direction along the straight line C. In the present embodiment, the straight line C passes through the center in the height direction of the screen 1 and is parallel to a horizontal plane (not shown).

[Transition of concave line]
FIG. 4 is a graph for explaining a change in the shape of a substantially circle. Specifically, the vertical axis in FIG. 4 indicates the size of the radius of the elliptical orbit on the incident surface 11 centered on the reference point A, and the horizontal axis indicates the reference point A and the reference point on the incident surface 11. The distance with the row | line | column M on the line B (or concave surface part 2) is shown. In FIG. 4, a graph indicated by a triangular mark indicates the diameter (radius) of the elliptical orbit in the X direction, and a graph indicated by a circle indicates the diameter (radius) of the elliptical orbit in the Y direction.
With reference to FIG. 4, the change in the diameter of the elliptical orbit by the above-described row M will be described in detail below.

  It can be seen that the substantially circular row M is a vertical ellipse having a long side longer than a short side in the Y direction at a position close to the reference point A (0, 0). Then, as the position from the reference point A increases, the difference between the lengths of the short side and the long side is reduced, and the position in the X direction and the Y direction from the reference point A becomes a perfect circle at a position of about 500 mm. It can be seen that the long sides are switched, that is, the vertical ellipse is switched to the horizontal ellipse. That is, the elliptical orbit of the row M of the concave surface portion 2 is set so as to increase in the direction perpendicular to the reference line B on the incident surface 11 as the row M moves away from the reference point A.

Further, as shown in FIG. 1, the concave surface portion 2 increases the pitch between the concave surface portions 2 adjacent to each other in the radial direction D from the reference point A (hereinafter simply referred to as a vertical pitch) as the distance from the reference point A increases. Are arranged as follows. Specifically, the vertical pitch P2 of the concave surface portion 2 formed at a position away from the reference point A is larger than the vertical pitch P1 of the concave surface portion 2 formed at a position close to the reference point A. .
Further, the concave surface portion 2 increases the vertical pitch of the concave surface portion 2 as the angle θ formed by the virtual line passing through the predetermined position on the incident surface 11 and the reference point A and the reference line B increases. It is arranged. Specifically, the vertical pitch P3 of the concave surface portion 2 formed at a position where the angle θ is larger than the vertical pitch P1 of the concave surface portion 2 formed at a position where the angle θ is small is larger.

  The concave surface portions 2 are arranged so that the pitch between the concave surface portions 2 adjacent to each other in the direction along the row M (hereinafter simply referred to as a lateral pitch) increases as the distance from the reference point A increases. Specifically, the lateral pitch Q2 of the concave surface portion 2 formed at a position away from the reference point A is larger than the lateral pitch Q1 of the concave surface portion 2 formed at a position close to the reference point A. .

Here, as described above, when the vertical pitch is increased as the angle θ increases, the straight line passing through the reference point A and the center point of the concave surface portion 2 and the tangent of the circumference of the ellipse forming the concave surface portion 2 Deviation occurs in the angle with the vertical line. The angle deviation increases as the distance from the reference point A increases, and the angle difference increases as the concave surface portions 2 arranged on the outer circumference. Thereby, even if it is a point which makes angle (theta) the same, the position of an effective reflection area | region will shift | deviate with the concave surface part 2 arranged on the inner periphery, and the concave surface part 2 arranged on the outer periphery. It will be.
However, by increasing the lateral pitch as the distance from the reference point A increases, the overlapping of the concave surface portions 2 can be reduced, and an effective reflection region shifted in the end portion direction of the concave surface portion 2 can be secured.

Further, the concave surface portion 2 has a maximum lateral pitch of the concave surface portion 2 formed at a position where the angle θ is approximately 45 degrees, and as the angle θ becomes smaller than approximately 45 degrees and as the angle θ increases, It arrange | positions so that the horizontal pitch of the concave surface part 2 may be decreased. Specifically, the concave surface portion 2 formed at a position where the angle θ is approximately 45 degrees, rather than the lateral pitch Q2, Q3 of the concave surface portion 2 formed at a position where the angle θ is approximately 0 degrees or approximately 180 degrees. The lateral pitch Q4 is larger.
This also secures an effective reflection area in which a deviation occurs as in the case where the lateral pitch is increased as the distance from the reference point A is increased.
Note that the angle θ that maximizes the lateral pitch may vary depending on the size of the screen 1, the positional relationship with the projector, and the like, and is not limited to approximately 45 degrees as in the present embodiment.

Here, as described above, the screen 1 has a long side in the direction along the straight virtual reference line B connecting the reference point A and the center point 11A of the incident surface 11 with the row M closest to the reference point A. Is formed along a vertically long elliptical orbit.
As a result, as will be described below, the shape of the concave surface portion 2 necessary for securing an effective reflection region can be reduced as compared with the case where the row M is formed along a perfect circular locus.

  FIG. 5 is a diagram schematically showing a part of the screen 1 (right side portion of the reference line B), and FIG. 6 is a diagram schematically showing a screen 31 which is a comparative example with the present embodiment. Here, the screen 31 in this comparative example is different from the screen 1 of the present embodiment in that the row N closest to the reference point A is formed along a perfect circle. Since the other configuration is the same as that of the screen 1, in FIG. 6 (the same applies to the following drawings), it is the same as or substantially the same as the screen 1, and the corresponding parts are denoted by the same reference numerals. Yes.

  In the present embodiment, as described above, the concave surface portions 2 are arranged along the vertical ellipse row M closest to the reference point A. Therefore, as shown in FIG. 5, the distance E in the X direction from the reference point A to the row M is the distance in the X direction from the reference point A to the row N corresponding to the row M in the comparative example shown in FIG. It becomes smaller than E1.

7 and 8 are diagrams showing the shapes of the concave surface portions 2 and 32 in the lower end portion T1 (the right end portion of the rows M and N located on the lower end side of the incident surface 11) shown in FIGS. Specifically, FIG. 7 shows the shape of the concave surface portion 2 of the present embodiment, and FIG. 8 shows the shape of the concave surface portion 32 in the comparative example.
As described above, since the length dimension E of the concave surface portion 2 in the radial direction D in the present embodiment is smaller than the length dimension E1 of the comparative example, the effective reflection region 22 can be secured as shown in FIG. The length dimension F in the radial direction D of the concave surface portion 2 can be made smaller than the length dimension F1 of the comparative example shown in FIG.

9 and 10 are diagrams showing the shapes of the concave surface portions 2 and 32 in the lower end portion T2 (upper end portions of the rows M and N located on the lower end side of the incident surface 11) shown in FIGS. 5 and 6. Specifically, FIG. 9 shows the shape of the concave surface portion 2 of the present embodiment, and FIG. 10 shows the shape of the concave surface portion 32 in the comparative example.
As described above, since the length dimension F in the present embodiment is smaller than the length dimension F1 of the comparative example at the lower end portion T1, it is effective also in the concave surface portion 2 at the lower end portion T2, as shown in FIG. The length dimension in the Y direction can be set smaller than that in the comparative example shown in FIG. 10 while the reflection region 22 is secured. In particular, the distance G from the upper end of the concave surface portion 2 to the effective reflection region 22 can be made shorter than the distance G1 of the comparative example shown in FIG.

11 and 12 are diagrams showing the shapes of the concave surface portions 2 and 32 at the upper end portion T3 (upper corner portion of the incident surface 11) shown in FIGS. 5 and 6. Specifically, FIG. 11 shows the shape of the concave surface portion 2 of the present embodiment, and FIG. 12 shows the shape of the concave surface portion 32 in the comparative example.
As described above, since the concave surface portions 2 are arranged along the vertical ellipse row M closest to the reference point A, in the present embodiment, as shown in FIG. The inclination angle θ3 with respect to the direction is larger than the inclination angle θ4 of the comparative example shown in FIG.

That is, as shown in FIG. 11, the inclination angle of the concave surface portion 2 with respect to the X direction, that is, the inclination angle θ5 between the X direction and the tangent of the row of the concave surface portion 2 is larger than the inclination angle θ6 of the comparative example shown in FIG. Can be bigger. Therefore, it is possible to set the size of the concave surface portion 2 adjacent in the direction along the row M to be smaller than that of the comparative example shown in FIG. 12 while keeping the effective reflection region 22 at the concave surface portion 2 at the upper end T3. it can. In particular, the distance H from the left end of the concave surface portion 2 to the effective reflection region 22 can be made shorter than the distance H1 of the comparative example shown in FIG.
As described above, the ratio of the area occupied by the effective reflection region 22 to the entire surface of the concave portion 2 can be improved as compared with the comparative example. Moreover, the concave surface part 2 which ensures the effective reflection area | region 22 can be provided in the entrance plane 11 more than a comparative example.

The screen 1 according to the present embodiment described above has the following effects.
Since the row M closest to the reference point A is formed along an ellipse (longitudinal ellipse) trajectory having a long side in the direction along the reference line B, the end (lower end) of the long side of the vertical ellipse in the row M Since the size of the concave surface portion 2 in the portion T2) can be reduced, the concave surface portions 2 can be densely arranged in the vicinity of the reference point A.

Further, when such a row M of the concave surface portions 2 is set from the reference point A, the inclination angle θ5 between the X direction and the tangent of the row M of the concave surface portions 2 is large at the corner portion (upper end portion T3) of the screen 1. Become. From this, also in the corners of the screen 1, the size of the adjacent concave surface portions 2 in the direction along the row M can be reduced while ensuring the effective reflection region 22, so that the concave surface portions 2 can be arranged densely.
Accordingly, since the concave surface portion 2 can be densely arranged on the entire incident surface 11, a large effective reflection area 22 on the incident surface 11 can be secured, and a large amount of projection light can be reflected on the front side of the screen 1. The brightness can be increased.

Further, in order to increase the pitch of the concave surface portion 2 in the radial direction D as the angle θ formed by the virtual line passing through the predetermined position on the incident surface 11 and the reference point A and the reference line B increases, the screen 1 The projection light can be efficiently advanced toward the front of the projector.
Further, since the elliptical orbit of the row M of the concave surface portion 2 is set to increase in the direction (X direction) perpendicular to the reference line B on the incident surface 11 as the row M moves away from the reference point A, The projection light can be efficiently advanced toward the front.

  Further, by forming another concave surface portion 2B between the rows M of the concave surface portions 2 adjacent to each other in the radiation direction D, it is separated from the reference point A even when the incident angle of the projection light with respect to the incident surface 11 is small. Since the projection light can be incident on the concave surface portion 2A on the other side, a large effective reflection region 22 on the incident surface 11 can be secured, and the projection light is reflected over the entire necessary range on the front side of the screen 1, so that the field of view of the screen A corner can be secured.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above-described embodiment, the configuration in which the concave surface portion 2 is formed on the substantially circular circumference centered on the reference point A is illustrated. However, the concave surface portion 2 may be formed along the row M. You may form in the position shifted irregularly in the direction along M, and the radiation | emission direction D, respectively. Thereby, generation | occurrence | production of a moire can be suppressed and the fall of an image quality can be prevented.
In the embodiment, the reference point A is provided on the extended surface of the incident surface 11, but the position of the reference point A is not limited to this. For example, the reference point A may be provided on the incident surface 11.
In the above-described embodiment, the elliptical orbit of the row M increases in the direction perpendicular to the reference line B on the incident surface 11 as the row M moves away from the reference point A. It may be larger on the extended surface.
In the embodiment, the elliptical orbit is switched from the vertical ellipse to the horizontal ellipse as the distance from the reference point A is changed. However, the transition of the elliptical orbit is not limited thereto. For example, a perfect circle may be used from the position where the vertical ellipse is switched to a perfect circle.
In the embodiment, one other concave surface portion 2B is provided for the concave surface portion 2A. However, the number of the concave surface portions 2B is not limited to this, and a plurality of concave surface portions 2B may be provided.
In the above-described embodiment, the innermost row M of the rows M is illustrated as the row M closest to the reference point A in FIGS. There may be.

  As described above, the screen according to the present invention is useful when displaying a presentation or a moving image, and is particularly suitable when displaying a projected image from a projector.

  DESCRIPTION OF SYMBOLS 1 ... Screen, 2 (2A, 2B) ... Concave surface part, 11 ... Incident surface, 11A ... Center point, A ... Reference point, B ... Reference line, C ... Straight line (straight line orthogonal to a reference line), D ... Radiation direction , M, M1 ... row, θ ... angle.

Claims (4)

A screen having an incident surface on which light forming an image is incident,
Each of the incident surfaces has a reflection region that reflects the light, and is along a plurality of substantially circular rows centering on a reference point on one of the incident surface and an extended surface of the incident surface. Each having a plurality of concave portions,
Of the plurality of rows, the row closest to the reference point is formed along an elliptical orbit having a long side in a direction along a virtual reference line connecting the reference point and the center point of the incident surface. A screen characterized by that. The screen of claim 1,
When the predetermined position on the incident surface is defined by an angle formed by the reference line, the reference point, and an imaginary straight line passing through the predetermined position, the radial direction centered on the reference point The pitch of the concave surface portion increases as the angle increases. The screen according to claim 1 or 2,
The elliptical orbit of the row of the concave surface portions increases in a direction perpendicular to the reference line on either the incident surface or an extended surface of the incident surface as the row moves away from the reference point. And the screen. The screen according to any one of claims 1 to 3,
Another concave surface portion is formed between the rows of the concave surface portions adjacent to each other in the radial direction centered on the reference point.

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