JPH09101568A - Screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain such a screen device that the whole screen can be made thin and small in size and that the screen can maintain enough strength and can be easily wound into a roll when the Fresnel lens is made thin. SOLUTION: A Fresnel lens 12 comprising a photosetting resin such as a UV-curing resin is formed in a film state on one surface of a film base 10 comprising a synthetic resin having high strength such as polyethylene terephthalate resin. Therefore, even when the Fresnel lens 12 is made thin, enough strength can be maintained by the film base body 10. Moreover, by using the film base body 10, the screen can be easily wound into a roll and the whole screen can be made thin and small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen device.

[0002]

2. Description of the Related Art A screen device on which an image is projected includes
There is a transmissive screen device for observing a projected image from the side opposite to the projection side. This transmissive screen device generally includes a transmissive screen including a Fresnel lens and a diffusion plate, and projection light having a divergence angle is incident on the Fresnel lens from the projection lens and the incident light is observed by the Fresnel lens. The light is condensed toward a person, and the condensed light is diffused by a diffusion plate and emitted to the observer side.

[0003]

However, in such a screen device, the thickness of the Fresnel lens is several meters.
Since it is as thick as about m, there is a problem that a ghost is noticeable, and it is difficult to wind the transmissive screen into a roll. In addition, in order to eliminate such inconvenience, it is considered to reduce the thickness of the Fresnel lens, but if the thickness of the Fresnel lens is simply reduced, the strength becomes weak and it is not suitable for actual use. There is a problem of being intolerable. An object of the present invention is to make it possible to secure a sufficient strength even if the Fresnel lens is thin, and to easily wind it in a roll shape, so that the entire screen can be made thin and compact.

[0004]

According to the present invention, a Fresnel lens made of a synthetic resin is formed in a film shape on one surface of a film-shaped substrate made of a strong synthetic resin. However, the film-shaped base material can secure sufficient strength, and since the film-shaped base material is used, the film-shaped base material can be easily wound into a roll shape, and the entire screen can be made thinner and smaller. Can be achieved. In this case, it is preferable that the Fresnel lens is made of a photo-curing resin or a thermosetting resin as described in claim 2, and the fresnel lens is a circular Fresnel lens or a linear Fresnel lens as described in claim 3. It is desirable that the diffusion layer is formed on the other surface of the base material by coating.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the screen device of the present invention will be described below with reference to FIGS. FIG. 1 is an external perspective view showing a usage state of the screen device. The screen device 1 is portable and includes a gutter-shaped screen case 2. Two support legs 3 are provided on the lower surface of the screen case 2, and an opening / closing lid 4 is rotatably attached to the upper part of the screen case 2. Further, a winding shaft (not shown) for winding the transmissive screen 5 is rotatably arranged in the screen case 2, and support shafts 6 are attached to both inner ends of the winding shaft so as to be upright and sideways. There is.
Each support shaft 6 is formed in a rod antenna shape,
The length of the screen case 2 is adjustable so that the screen case 2 can be stored in a contracted state. Therefore, in this screen device, the screen case 2
The support shafts 6 provided at both inner ends of the screen are erected to adjust the height, and the transmissive screen 5 wound around the take-up shaft in the screen case 2 is pulled out. The transmissive screen 5 is set by locking both ends of the provided support rods 7 to the upper ends of the respective support shafts 6.

The transmissive screen 5 of the screen device 1 is provided with a film-shaped base material 10 as shown in FIG. The film-shaped substrate 10 is made of polyethylene terephthalate resin (PET) having excellent tensile strength and refractive strength.
The surface treatment layer 11 is formed on both surfaces of the resin, and the Fresnel lens 12 is formed in a film on one surface (the surface on the incident side where the projection light is incident) and the other surface (the projection light is emitted). The diffusion layer 13 is formed on the exit side surface. The Fresnel lens 12 is made of a photocurable resin such as an ultraviolet curable resin, and in a state where this resin is applied to the surface of the base treatment layer 11 on one surface of the base material 10, the grooved roller is rolled to form a lens on the resin. While forming the groove, light such as ultraviolet rays is irradiated from the other surface side of the base material 10 to cure the resin, thereby forming a film shape. The Fresnel lens 12 may be either a circular one in which the lens groove is formed in an annular shape or a linear one in which the lens groove is formed in a linear shape. The diffusion layer 13 includes an organic diffusion agent 13a such as microbeads and a coloring agent 13b.
And a binder 13c, and is formed on the surface of the base treatment layer 11 on the other surface of the base material 10 by coating so as to have a substantially constant film thickness. Therefore, the transmissive screen 5 is formed to be extremely thin with a total thickness of 250 μm or less.

Next, the case of using such a screen device 1 will be described. In this case, first,
As shown in FIG.
By adjusting the height by standing up, and by locking both ends of the support rod 7 at the tip of the transmissive screen 5 pulled out from the screen case 2 to the upper end of each support shaft 6,
The transmissive screen 5 is set. In this state, when projection light from an image forming apparatus (not shown) such as a liquid crystal projector is applied to the transmissive screen 5 as shown in FIG. 2, first, the projection light is refracted by the Fresnel lens 12 on the incident side. The refracted light passes through the base material 10 and enters the diffusion layer 13 on the emission side, and the organic diffusion agent 1 of the diffusion layer 13
It is diffused by 3a and emitted to the observer side. Thereby, the projected image can be observed. In this case, since the transmissive screen 5 is as thin as about 250 μm, a ghost is not noticeable, and a strong and bright image can be obtained against external light.

When the screen device 1 is not used, the support rod 7 at the tip of the transmissive screen 5 is removed from the upper end of each support shaft 6 and the transmissive screen 5 is wound on the winding shaft. , Can be stored in the screen case 2. Also, after contracting each support shaft 6,
It can be stored in the screen case 2 by turning it over. After that, when the opening / closing lid 4 is closed, the entire screen device 1 has a columnar shape, which is very compact. Therefore, it is easy to handle and convenient to carry and store.

As described above, in the screen device 1,
The film-shaped substrate 1 in which the transmissive screen 5 is made of a strong synthetic resin such as polyethylene terephthalate resin
Since the Fresnel lens 12 made of a photo-curable resin such as an ultraviolet curable resin is formed on one surface of the film 0 in a film shape, even if the Fresnel lens 12 is thinned, the film-shaped substrate 10
As a result, sufficient strength can be ensured, and therefore, the transmissive screen 5 can be easily wound into a roll, and the screen device 1 as a whole can be made thin and compact. In this case, since the Fresnel lens 12 of the transmissive screen 5 uses a photocurable resin such as an ultraviolet curable resin, its manufacture is simple and highly accurate.

In the above embodiment, the Fresnel lens 5 is formed in a film shape with a photocurable resin such as an ultraviolet curable resin. However, the present invention is not limited to this and may be formed with a thermosetting resin, for example. In this case, a thermosetting resin may be applied to the undercoat layer 11 on one surface of the film-shaped substrate 10 and the resin may be heated and cured while forming the lens groove in the resin with the grooved roller. Even in this case, similarly to the above-described embodiment, it is possible to obtain the one which is easy to manufacture and has high accuracy.

In the above embodiment, the diffusion layer 13 is composed of the organic diffusion agent 13a, the coloring agent 13b, and the binder 13c, but not limited to this, it may be a lenticular lens layer, for example. A two-layer structure including a diffusion layer composed of the diffusion agent 13a, the colorant 13b, and the binder 13c and a lenticular lens layer may be used.

Further, in the above-described embodiment, the transmission screen 5 has a single-layer structure in which the Fresnel lens 12 is provided on one surface of the film-shaped substrate 10 and the diffusion layer 13 is provided on the other surface. Since the thickness is very thin, about 250 μm, the present invention is not limited to this, and when the Fresnel lens 12 is a linear Fresnel lens, a lens groove orthogonal to the lens groove of the Fresnel lens 12 of the above embodiment is formed on one surface of another base material. The linear Fresnel lens may be formed, and the other base material may be superposed on the base material 10 of the above-described embodiment to form a two-sheet structure.

[0013]

As described above, according to the present invention, since the Fresnel lens made of the synthetic resin is formed in a film shape on one surface of the film-shaped substrate made of the strong synthetic resin, the thickness of the Fresnel lens is increased. Even if the thickness is thin, the film-shaped base material can secure sufficient strength, and since the film-shaped base material is used, it can be easily wound into a roll shape, and the entire screen is thin. It is possible to reduce the size and size.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a usage state of an embodiment of a screen device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the transmissive screen shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen device 5 Transmission type screen 10 Film-shaped substrate 12 Fresnel lens 13 Diffusion layer

Claims (4)

[Claims] 1. A screen comprising: a film-shaped base material made of a strong synthetic resin; and a Fresnel lens made of a synthetic resin film-formed on one surface of the film-shaped base material. apparatus. 2. The screen device according to claim 1, wherein the Fresnel lens is made of a photocurable resin or a thermosetting resin. 3. The screen device according to claim 1, wherein the Fresnel lens is a circular Fresnel lens or a linear Fresnel lens. 4. The screen device according to claim 1, wherein a diffusion layer is formed on the other surface of the base material by coating.