JP3663499B2 - Reflective screen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reflective screen for observing image light from the front by reflecting it with a reflective layer.
[0002]
[Prior art]
Conventionally, a reflection screen of this type has been known (Japanese Patent Laid-Open No. 8-29875) in which a light transmitting diffusion layer is provided on the front side of a transparent sheet and a linear Fresnel lens surface for light reflection is provided on the back side.
[0003]
[Problems to be solved by the invention]
However, since the above-described conventional reflective screen is isotropic in reflection, the horizontal and vertical diffusion cannot be suitably controlled.
In addition, external light reflection is likely to occur, and in particular, there is a problem that contrast is lowered by external light from above.
[0004]
Therefore, an object of the present invention is to provide a reflective screen that can obtain a suitable viewing angle and suppress a decrease in contrast due to external light.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 has a light-transmitting layer and a linear Fresnel lens shape formed on the back side of the light-transmitting layer and having the longitudinal direction of the lens surface provided vertically. A vertical control lenticular lens that is formed on a surface side of the light-transmitting layer, is formed in a direction substantially perpendicular to the direction of the linear Fresnel lens, and controls a vertical optical axis; A horizontal control lenticular lens shape that is formed in the reflective layer in substantially the same direction as the linear Fresnel lens and controls the optical axis in the horizontal direction independently of the vertical control lenticular lens, and a collection of the vertical control lenticular lenses. a portion which is not incident image light by the light action, and a light absorbing portion provided on the light transmitting layer as the vertical cross section becomes trapezoidal It is characterized in.
[0008]
According to a second aspect of the present invention, in the reflective screen according to the first aspect, the lenticular lens has a light incident surface provided with a mat shape.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a first embodiment of a reflective screen according to the present invention.
The reflective screen 10A according to the first embodiment is formed on a light-transmitting layer 11 made of a resin sheet or film such as acrylic, polycarbonate, polyethylene terephthalate, and the back surface side of the light-transmitting layer 11, and has a long lens surface. And a Fresnel reflecting surface 12 having a linear Fresnel lens shape with a direction perpendicular thereto.
Such a Fresnel reflection surface 12 is obtained by providing a linear Fresnel lens shape on the back side of the light-transmitting layer 11 using an ultraviolet curable resin or the like, and forming a reflective film on the linear Fresnel lens surface. It is done.
[0013]
The reflective screen 10A is provided with a mat surface (first optical axis control means) 13 for controlling the optical axis in the vertical direction on the surface side (observation side) of the light transmissive layer 11.
As shown in the sectional view of FIG. 1, the lens surface 12a of the Fresnel reflection surface 12 has an optical axis correction effect for controlling the optical axis in the horizontal direction and a diffusive effect with directivity in substantially the same direction as the Fresnel lens. A horizontal diffusion lenticular lens (second optical axis control means) 14 is formed.
[0014]
According to the first embodiment, the image light is diffused in the horizontal direction by the horizontal diffusion lenticular lens 14 when reflected by the Fresnel reflection surface 12, and is mainly diffused in the vertical direction by the mat surface 13. Therefore, the diffusion angle can be controlled in two directions, horizontal and vertical. Therefore, the image light can be used effectively and the gain can be increased.
Further, since the mat surface 13 is provided on the observation side, the reflection of the light source can be prevented and the lens surface 12a of the Fresnel reflection surface 12 has a defect caused by the mold. This can be inconspicuous.
[0015]
(Second Embodiment)
FIG. 2 is a diagram showing a second embodiment of the reflective screen according to the present invention.
Note that, in the second embodiment, the same reference numerals are given to the portions that perform the same functions as those of the first embodiment described above, and repeated description will be omitted as appropriate.
The reflective screen 10B of the second embodiment has a vertical diffusion lenticular lens for controlling the vertical optical axis in a direction substantially perpendicular to the direction of the linear Fresnel lens of the Fresnel reflection surface 12 on the surface side (observation side). (First optical axis control means) 15 is provided. The vertical diffusion lenticular lens 15 has a mat shape 16 on its light incident surface.
[0016]
Further, as shown in the cross-sectional view of FIG. 2, the reflective screen 10 </ b> B improves the contrast of the light transmissive layer 11 in a portion where no image light is incident due to the light condensing action of the vertical diffusion lenticular lens 15. The light absorption part 17 which can do is provided.
That is, unnecessary external light enters from the upper side of the observation side, so that the external light is condensed by being shifted downward from the image light by the vertical diffusion lenticular lens 15, and the non-permission of the vertical diffusion lenticular lens 15. It is absorbed by the light absorption part 17 formed in the condensing part.
[0017]
According to the second embodiment, the image light is diffused in the horizontal direction by the horizontal diffusion lenticular lens 14 when reflected by the Fresnel reflection surface 12, and is diffused in the vertical direction by the vertical diffusion lenticular lens 15. Therefore, the diffusion angle can be controlled in two directions, horizontal and vertical.
Moreover, since the light absorption part is provided, reflection of external light can be suppressed while being a reflective screen.
[0018]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, this reflection type screen can be made into a roll-up type screen by making it into a film form.
[0019]
【The invention's effect】
As described above in detail, since the first and second optical axis control means are provided independently and the diffusion angle is controlled in two directions, the image light can be used effectively and the gain can be increased. .
Further, since the optical axis correction can be performed in two directions, an image without color shift, shading, etc. can be obtained.
[0020]
Furthermore, since the light absorbing portion is provided, reflection of outside light can be suppressed while being a reflection type screen, and it can be used in a bright room.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a reflective screen according to the present invention.
FIG. 2 is a diagram showing a second embodiment of a reflective screen according to the present invention.
[Explanation of symbols]
10A, 10B Reflective screen 11 Light transmissive layer 12 Fresnel reflective surface 13 Matte surface (first optical axis control means)
14 Horizontal diffusion lenticular lens (second optical axis control means)
15 Vertical diffusion lenticular lens (first optical axis control means)
16 Matte shape 17 Light absorption part

Claims (2)

In a reflective screen including a light transmissive layer and a reflective surface having a linear Fresnel lens shape formed on the back surface side of the light transmissive layer and provided with the longitudinal direction of the lens surface being vertical,
A vertical control lenticular lens formed on the surface side of the light transmissive layer, formed in a direction substantially perpendicular to the direction of the linear Fresnel lens, and controlling the optical axis in the vertical direction;
A horizontal control lenticular lens shape that is formed in the reflective surface in substantially the same direction as the linear Fresnel lens and controls the optical axis in the horizontal direction independently of the vertical control lenticular lens ;
A light absorbing portion provided in the light-transmitting layer so that the vertical cross-sectional shape is a trapezoidal shape in a portion where image light is not incident due to a condensing function of the vertical control lenticular lens ; Reflective screen.   The reflective screen according to claim 1, wherein the vertical control lenticular lens has a light incident surface provided with a mat shape.

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