JPH02275934A - Transmissive projection screen - Google Patents

Abstract

PURPOSE:To always observe a sharp picture even if temperature, humidity, etc., vary by forming an adhesive layer on non-light-emitting part of a lens sheet and sticking it on a lens sheet close to the observation side. CONSTITUTION:The part 4 that does not emit light is provided on the light emitting part of the lens sheet 1 with light condensing properties. The adhesive layer 5 obtained by applying an adhesive on the surface of the non-light-emitting part 4 is formed, and bonds the lens sheet 6 arranged close to the observation side. Namely, the adhesive layer 5 applies a lenticular lens sheet 1 to the lens sheet 6 close to the observation side to integrate all the lens sheets. The adhesive layer 5 is formed in a way that an adhesive is applied on the surface of the non-light-emitting part 4 of the lenticular lens sheet 1 by a screen printing method, a transfer method, etc. Consequently, even if temperature, humidity, etc., vary, no gap is generated between the lens sheets to obtain the transmissive projection screen with high resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission type projection screen for use in a projection television or the like, which includes a lens sheet I with a light-concentrating property, and in particular, to This invention relates to a transmission type projection screen in which an adhesive layer is formed on the non-light emitting part of a lens sheet with a light condensing property to be arranged, and a lens sheet adjacent to the observer side is bonded and integrated with this adhesive layer.

(Prior Art) Various types of transmission projection screens have been used in which light projected from a light source onto the back side of a screen surface is observed as an image from the front side.

Such a transmissive projection screen is required to have a wide viewing angle, that is, to be able to observe images on the screen surface from wide angles in the vertical and horizontal directions. In addition, it is also required to have good resolution and high contrast. For this reason, there are many cases in which a lenticular lens sheet for vertical diffusion and a lenticular lens sheet for horizontal diffusion are combined, and there are also cases in which these are combined with a Fresnel lens sheet.

A lenticular lens sheet is made of resin and has multiple cylindrical lenticular lens elements formed in parallel on its surface.
Or a glass lens sheet. A lenticular lens sheet for vertical diffusion has a lenticular lens element axis in the horizontal direction and diffuses light from a light source in the vertical direction. A lenticular lens sheet for horizontal diffusion has the axis of the lenticular lens element in the vertical direction and diffuses light from a light source in the horizontal direction.

A Fresnel lens sheet has a large number of alternating peaks and valleys, and converts light from a light source into substantially parallel light that is emitted toward the viewing side.

These lens sheets generally use a plastic sheet as a substrate, but in recent years, the number of lens sheets that use a plastic film as a substrate is increasing.

This is because, in the case of a lenticular lens sheet, if the pitch is made finer (higher resolution), the plate thickness becomes thinner, and if the sheet is used as a substrate, the mechanical strength becomes weaker.

In the case of a Fresnel lens sheet, since the acrylic resin used as the molding material is expensive, manufacturing costs can be reduced by molding the Fresnel lens on the film that is the substrate.

In addition, a lenticular lens for vertical diffusion on one side,
One lens sheet with a Fresnel lens formed on the other side can be made thinner by using a film.
Resolution can be improved.

Transmissive projection screens made up of a plurality of lens sheets, including these lenticular lens sheets, require the lens sheets to be combined so that there are no gaps.

Conventionally, in order to integrate each lens sheet, this type of transmissive projection screen has either fixed the end of each lens sheet using a U-shaped stopper in cross section, or fixed the end of each lens sheet using screws. They were also joining together. At that time, each lens sheet was warped so that the curvature of each lens sheet was different, and then the lens sheets were stacked on top of each other.

[Problem to be solved by the invention]

However, even if each lens sheet is integrated in this way, each lens sheet will expand and contract if environmental conditions such as temperature and humidity change. Therefore, each lens sea I.
Gaps are likely to occur between the two, particularly when a resin is used as the base material of the lens sheet.

For this reason, the conventional transmission type projection screen has the problem that the image on the screen surface is blurred and the resolution is degraded.

In addition, if a lens sheet using a flexible film is included among multiple lens sheets, it is not possible to apply warp processing, so there is a problem that it is not possible to make each lens sheet stick closely together. Ta.

In order to achieve close contact, a mechanism for applying outward tension to the lens sheet, a so-called tension mechanism, may be attached, but this poses the problem of requiring a large scale overall.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission projection screen with good resolution by preventing gaps from forming between lens sheets even if environmental conditions such as temperature and humidity change.

Another object of the present invention is to provide a transmissive projection screen that allows each lens sheet to be brought into close contact with each other with a simple configuration and that can enhance contrast even when lens sheets using flexible films are included. It is to provide.

Means for Solving Problem 1] In order to solve the above problem, a transmission projection screen according to the present invention has optical properties that include a lens sheet with a light-concentrating property in which a plurality of lens elements with a light-concentrating property are formed. In a transmission type projection screen in which at least two different lens sheets are glued together, a non-light-emitting part that does not emit light is provided on the light-emitting surface of the lens sheet having light-condensing properties, and an adhesive is applied to the surface of the non-light-emitting part. A coated adhesive layer is formed, and a lens sheet I arranged adjacent to the viewer side is adhered by the adhesive layer.

At this time, at least one of the lens sheets 1 to 1 of the light-condensing lens sheet or the lens sheet combined therewith may have a thinly molded plastic film as a substrate.

Further, the light-condensing lens sheet may be a lenticular lens sheet in which a plurality of lenticular lens elements are formed in parallel on the light incident surface.

The non-light emitting portion may be provided so as to protrude more than the light emitting portion from which light is emitted.

The adhesive layer may be light-absorbing.

FIG. 1 is a diagram for explaining the gist of a transmission type projection screen according to the present invention.

In FIG. 1, lenticular lens sheets 1 to 1 are lens sheets having light condensing properties, and 6 are lens sheets disposed on the observation side.

Note that the arrows in the figure indicate the optical path of light projected from the light source onto the transmission projection screen.

The light projected from the light source enters the light incident surface of the lenticular lens sheet 1 as shown by the arrow in FIG. Thereafter, the light is refracted and condensed by the lenticular lens element 2 on the light incident surface, and the light is output from the light output section 3.

In addition to lenticular lenses, examples of lens elements with light condensing properties include so-called fly's-eye lenses in which a plurality of convex lenses are formed on the light incident surface.

The light emitted from the light emitting section 3 enters the lens sheet 6 disposed adjacent to the observer side of the lenticular lens sheet 1, and is projected as an image on the observer side surface.

A plastic family film can be used for the substrate of each lens sheet. This makes it possible to solve the aforementioned problems of mechanical strength, manufacturing cost, and resolution.

The lenticular lens sheet 1 is provided with a lenticular lens element 2 for condensing light on the light incident surface, and a non-light emitting portion 4 is provided on the light emitting surface by appropriately setting the thickness of the lens sheet. be able to.

As shown in FIG. 1, the light projected from the light source does not pass through the non-light emitting portion 4. Therefore, the non-light emitting portion 4 does not affect the image projected onto the lens sheet 6 adjacent to the viewer side.

Therefore, even if there is a substance in the non-light emitting portion 4 that has optical properties different from those of the base material of the lenticular lens sheet 1, such as refractive index, the performance of the transmission type projection screen will not deteriorate. Thereby, the adhesive layer 5 can be formed by applying an adhesive, which will be described later, to the surface of the non-light emitting part 4.

With this adhesive layer 5, the lenticular lens sheet 1 can be adhered to the lens sheet 6 adjacent to the viewer side, so that each lens sheet 1 can be integrated.

Further, the Jl-light emitting section 4 can be provided so as to protrude from the light emitting section 3 from which light is emitted.

As described above, the non-light emitting part 4 is a part through which no light passes, so even if it is provided in this way, it does not affect the image projected onto the lens sheet 6.

When the non-light emitting part 4 protrudes, the boundary with the light emitting part 3 becomes clear. Therefore, the adhesive layer 5 can be easily formed because the position where the adhesive is applied becomes easier to match. Note that the non-light emitting portion 4 may have any shape as long as it can be easily coated with an adhesive.

Further, the non-light emitting portion 4 may have a trapezoidal cross section so that it becomes thinner from the light source side toward the viewer side. When the non-light emitting portion 4 has a trapezoidal cross section, the light emitted from the light emitting portion 3 is less likely to hit the non-light emitting portion 4, so that there is less loss in the amount of light projected from the light source.

The adhesive layer 5 is attached to the Jl- of the lenticular lens sheet 1.
Adhesive is applied to the surface of the light emitting part 4 by screen printing.

It may be formed by coating by a method such as an offset printing method, a gravure printing method, or a transfer method.

At this time, by mixing a black pigment or the like into the adhesive layer 5, a light absorption band can be formed. This is to improve contrast, and when a fly's eye lens is formed on the light entrance surface, a lattice-like light absorption band, the so-called blur.
Since a black matrix can be formed, contrast can be further improved.

The adhesive can be selected as appropriate depending on the type of resin used for the base materials of the lens sheet 1, the lens sheet 6, and the lens sheet 6. For example, if the base material is an acrylic resin, an acrylic adhesive, an epoxy adhesive, or the like may be used.

In addition, as for the manufacturing method of the lens sheet, extrusion molding method, pressing method, etc. are mentioned, and for those using a film for the substrate, ionizing number 1.1 ray which is cured by irradiation with ionizing radiation such as ultraviolet rays or electron beams is used. A method using a cured resin (photopolymer method) is preferred.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings and the like.

FIG. 2 is a perspective view showing a first embodiment of a transmissive projection screen according to the present invention.

Note that the same reference numerals are given to parts that perform the same functions as those of the transmissive projection screen of the present invention described above.

A lenticular lens sheet is a lenticular lens sheet for vertical diffusion placed on the light source side.

The light emitting surface of the lenticular lens sheet 1.1 is provided with a light emitting part 3 from which light is emitted and a non-light emitting part 4 from which no light is emitted.The surface of the non-light emitting part 4 is coated with an adhesive. An adhesive layer 5 is formed.

The lenticular lens sheet 7 is adjacent to the lenticular lens sheet 1 on the viewer's side, and in this example is disposed closest to the viewer. The lenticular lens sheath 1-7 is for horizontal diffusion.

In the first embodiment configured as described above, the lenticular lens sheet 1 and the lenticular lens sheet 7 are bonded together by the adhesive layer 5, and an integrated transmission type projection screen with no gaps can be obtained.

FIG. 3 is a perspective view showing a second embodiment of a transmissive projection screen according to the present invention.

In this embodiment, as in the first embodiment, a lenticular lens sheet 8 for vertical diffusion is placed on the light source side, and a lenticular lens sheet 7 for horizontal diffusion is placed closest to the viewer.

The light emitting surface of the lenticular lens sheet 8 for vertical diffusion includes a light emitting part 9 and a non-light emitting part 10 that protrudes from the light emitting part 9.
An adhesive layer 11 is formed on the surface of the non-light emitting part 10.

In this example, the lenticular lens sheet 8 and the lenticular lens sheet 7 are bonded together by an adhesive layer 11.

In the second embodiment, since the non-light emitting part 10 is provided so as to protrude from the light emitting part 9, there is no need for positioning when applying the adhesive, and the adhesive layer 11 can be easily formed. .

FIG. 4 is a diagram showing a third embodiment of a transmission type projection screen according to the present invention, in which FIG. 4A is a perspective view and FIG. 4B is a perspective view.
The figure is a sectional view showing a part of the screen of the same embodiment.

This embodiment is composed of three lens sheets, which are arranged in order from the light source side: a Fresnel lens sheet 12, a lenticular lens sheet 13 for vertical diffusion, and a lenticular lens sheet 14 for horizontal diffusion.

The size of the lens sheet is Fresnel lens 1 to 12 with a thickness of 3 mm, and a lenticular lens sheet for horizontal diffusion]
4 has a thickness of 1 mm and a pinch of 1 mm. Note that a plurality of band-shaped light absorption bands are formed on the light exit surface of the lenticular lens sheet 14.

The lenticular lens sheet 13 for vertical diffusion uses a plastic film as a substrate and has a thickness of 10 mm.
0μ, the pitch is 100μ, and the diffusion angle is ±20°.

The light source light focused by the lenticular lens element 15 is configured to be emitted from the light emitting section 17.

The non-light emitting part] 6 has a width of 70 μm, and a black acrylic adhesive layer 18 is formed on its surface to a thickness of 10 μm by gravure printing.

When each lens sort is placed in close contact with each other, the Fresnel lens sheet 12 and the lenticular lens sheet 14 are warped in advance, and the lenticular lens sheet 13
After adhering to the lenticular lens sheet I 14 using the adhesive layer 18, it is possible to combine it with the Fresnel lens sheet 2.

FIG. 5 is a diagram showing a fourth embodiment of a transmission type projection screen according to the present invention, in which FIG. 5A is a perspective view and FIG. 5B is a perspective view.
The figure is a sectional view showing a part of the screen of the same embodiment.

In this example, in order from the light source side, the Fresnel lens section 112,
A lenticular lens sheet 1-1.9 for horizontal diffusion and a lenticular lens sheet 20 for vertical diffusion are arranged.

The sizes of the lens sheets are as follows: Fresnel lenses 1 to 12 have a thickness of 3 mm, and the lenticular lens sheet 20 for vertical diffusion has a thickness of 2 mm, with a pitch of 0.5 marks. A light absorption band is formed on the surface of a convex non-light emitting portion on the light emitting surface of the lenticular lens sheath I.20.

The lenticular lens sheet 19 placed in the middle uses a plastic film as a substrate, and has a thickness of 2.
00-500/1. The pitch is 300μ.

The non-light emitting part 22 of the lenticular lens sheath I-19 is
A black adhesive layer 24 is formed on the surface of the non-light emitting portion 22 by an offset graphia printing method, which protrudes beyond the light emitting portion. In addition, 23 is a Lentsch Fuller lens provided in the light emitting part.

When the lens sheets are to be brought into close contact with each other, the Fresnel lens sheet 12 and the lenticular lens sheet 20 are warped, and the lenticular lens sheet 19 is pasted onto the lenticular lens sheet 20, as in the third embodiment. What is necessary is to combine the Fresnel lens sheet 12 from the above.

FIG. 6 is a diagram showing a fifth embodiment of the transmission projection screen according to the present invention, in which FIG. 6A [5 is a perspective view,
FIG. B is a cross-sectional view showing the minus part of the screen of the same embodiment.

This example is a two-sheet screen, consisting of a double-sided lens sheet I/25 placed on the light source side and a lenticular lens sheet 14 for horizontal diffusion placed on the viewing side. A lenticular lens section 27 is formed on the light source side of the double-sided lens sheet 25, and a lenticular lens section 27 is formed on the observation side.
A Fresnel lens portion 28 is formed. The lenticular lens sheet 14 for horizontal diffusion is similar to the third embodiment described above, and has a thickness of 1 mm and a pitch of 1 mm.
It is mm.

The double-sided lens sheet 25 uses a plastic film as a substrate and has a thickness of 00 to 200 μm, a pinch of lenticular lens portion 27 of 100 μm, and a pitch of Fresnel lens portion 28 of 20 to 30 μm.

Even in the case of such a double-sided lens with a ratio of 1.25, it is necessary to form the adhesive layer 30. Zunawa 4) By condensing the light source light with the wrench on the light entrance surface 27, a non-light emitting portion 29 is formed on the Fresnel lens portion 28 which is the light exit surface. 31, if the adhesive layer 30 is formed on.

In this example, the adhesive layer 30 is formed using a black adhesive using the Clavia printing method.

When each lens sheet I. is attached closely, the double-sided lens sheet 1-25 may be adhered to the lenticular lens sheet 14 using the adhesive layer 30, and there is no need for warping.

Deformations of the gods can be made without being limited to the embodiments described above.

The above-mentioned 1. In the second embodiment, a wrench for vertical diffusion and a wrench for horizontal diffusion: Although the description has been given of a structure in which layers are formed, conversely, lenticular lens sheets for horizontal diffusion and vertical diffusion may be arranged in order from the light source side. In this case, an adhesive layer is formed on a lenticular lens sheet for horizontal diffusion, and this is adhered to a lenticular lens sheet for vertical diffusion adjacent to the viewer side.

The present invention can be applied even if a transmission type projection screen including a lenticular lens sheet is composed of three or more lens sheets. For example, if a lenticular lens sheet for vertical diffusion, a Fresnel lens sheet, and a lenticular lens sheet for horizontal diffusion are arranged in order from the light source side, an adhesive layer is formed on the lenticular lens sheet for vertical diffusion, and the Fresnel lens sheet is attached to the lenticular lens sheet for horizontal diffusion. Lensea I
・Glue to. In this way, even if a lens sheet other than the lenticular lens sheet is placed on the viewer's side, an adhesive layer can be formed on the lenticular lens sheet in the same way and bonded to the lens sheet adjacent to the viewer's side. can do.

〔Effect of the invention〕

As explained in detail above, according to claims (1) to (3), an adhesive layer is formed on the non-light emitting part of the lens saw I,
Since this is glued to the lens sheet I adjacent to the observer's side, there is no gap between each lens sheet even if environmental conditions such as temperature and humidity change, so there is no deterioration in resolution. , you can always observe clear images. especially,
In the case of a two-sheet transmission type projection screen, each lens sheet can be easily stuck together without any warping or the like.

According to claim (4), since the non-light emitting portion is provided so as to protrude from the light emitting portion, there is no need for positioning when applying the adhesive, and it becomes easier to form the adhesive layer. Therefore, a transmissive projection screen can be easily integrated.

According to claim (5), the contrast of the screen surface can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the gist of a transmission type projection screen according to the present invention. FIG. 2 is a perspective view showing a first embodiment of a transmissive projection screen according to the present invention. FIG. 3 is a perspective view showing a second embodiment of a transmissive projection screen according to the present invention. FIG. 4 is a diagram showing a third embodiment of a transmission type projection screen according to the present invention, in which FIG. 4A is a perspective view and FIG. 4B is a perspective view.
The figure is a sectional view showing a part of the screen of the same embodiment. FIG. 5 is a diagram showing a fourth embodiment of a transmission type projection screen according to the present invention, in which FIG. 5A is a perspective view and FIG. 5B is a perspective view.
The figure is a sectional view showing a part of the screen of the same embodiment. FIG. 6 is a diagram showing a fifth embodiment of a transmission type projection screen according to the present invention, in which FIG. 6A is a perspective view and FIG. 6B is a perspective view.
The figure is a sectional view showing a part of the screen of the same embodiment. 1 7 B 13 14.19.20... Lenticular lens sheet 2 15 21... Lens element 3.9, 17.23... Light emitting part 4.10, 16, 22.29... Non-light emitting part 5 11
18 24 30... Adhesive layer 6... Lens sheet

Claims (5)

[Claims] (1) In a transmission projection screen that combines at least two lens sheets with different optical properties, including a light-condensing lens sheet in which a plurality of light-condensing lens elements are formed, the light-condensing lens A non-light emitting part that does not emit light is provided on the light emitting surface of the sheet, an adhesive layer is formed by applying an adhesive on the surface of the non-light emitting part, and a lens sheet placed adjacent to the observer side is bonded by the adhesive layer. A transparent projection screen that is characterized by: (2) At least one lens sheet among the light-condensing lens sheet or the lens sheet combined therewith has a substrate made of a thinly molded plastic film. Transparent projection screen. (3) The light-condensing lens sheet is a lenticular lens sheet in which a plurality of lenticular lens elements are formed in parallel on the light incident surface.
Transmissive projection screen according to 1) or (2). (4) Claims (1) to (3) characterized in that the non-light emitting portion is provided so as to protrude beyond the light emitting portion from which light is emitted.
) Transmissive projection screen. (5) The transmission projection screen according to any one of claims (1) to (4), wherein the adhesive layer has light absorbing properties.