JPH0218539A - Transmissive screen and its manufacture, and projection type image display device using transmissive screen - Google Patents

Abstract

PURPOSE:To manufacture the transmissive screen which never decreases in resolution by coupling a Fresnel lens plate and 1st and 2nd lenticular plates by two cohesive sheets over the entire effect display area. CONSTITUTION:In a 1st stage, exposed parts of cohesive materials of the cohesive sheets 6 and 8 are stuck on end parts of both surfaces of the lenticular plate 7 and interposed between two pressure rollers 32 and 33, which are rotated at constant speed to stick the cohesive sheets 6 and 8 on the plate 7. In a 2nd stage, a peeling sheet 20 is all peeled off the cohesive sheet 6, and the plate 7 is superposed on the Fresnel lens plate 5 from an end and interposed between the rollers 32 and 33. Then when the rollers 32 and 33 are rotated at the constant speed, the plate 7 is coupled uniformly on the plate 5. At this time, material supply rollers 26 and 27 and take-up rollers 30 and 31 are stopped at all times. Then processing similar to that in the 2nd stage is performed in a 3rd stage to form the transmission screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmissive screen for projecting images from the rear, a method for manufacturing the same, and a projection image display device using the transmissive screen.

2. Description of the Related Art In order to obtain a large-screen image, it has been well known to project an image onto a relatively small picture tube and then enlarge and project the image onto a screen using a projection lens. Recently, transmissive screens that project images from the back have been widely used because they can be used even in bright rooms.

An example of the conventional configuration of such a transmission screen is shown in FIG. It is composed of a Fresnel lens plate 1 and a lenticular plate 2, and a Fresnel lens 3 and a lenticular lens 4 are stacked facing each other. A Fresnel lens plate 1 is placed on the light source side, and a lenticular plate 2 is placed on the observer side. The Fresnel lens plate 1 converts the diverging light from the projection lens into substantially parallel light to make the peripheral area appear brighter to the viewer. The lenticular plate 2 is a translucent plate in which light scattering particles are dispersed, and the lenticular lens elements 4 are arranged on the surface of the translucent plate with the longitudinal direction of one element oriented vertically.
It is designed to widen the suitable viewing angle in the horizontal direction.

Problems to be Solved by the Invention The transmissive screen shown in FIG. 12 has a problem in that the suitable viewing angle in the vertical direction cannot be made very wide. This is because if you try to forcefully widen the vertical viewing angle, backscattering by light scattering particles will increase, making it impossible to efficiently emit light forward.

Furthermore, since the transmission screen shown in FIG. 12 is composed of two sheets, a gap is likely to be formed between the Fresnel lens plate 1 and the lenticular plate 2, and this gap has the problem of reducing resolution. .

The present invention has been made in view of the above, and an object of the present invention is to provide a transmission screen that has a wide suitable viewing angle in the vertical direction, has little backscattering, and does not generate unstable gaps. It is an object of the present invention to provide a manufacturing method for efficiently manufacturing a screen, and further to provide a projection type image display device that uses this transmission type screen and has consistently good image quality.

Means for Solving the Problems In order to solve the above problems, the transmission screen of the present invention has a Fresnel lens plate, first and second lenticular plates, and has an adhesive material on both sides and is translucent. certain first and second adhesive sheets, the lenticular lenses of the two lenticular plates are orthogonal to each other, the Fresnel lens plate, the first adhesive sheet, the first lenticular plate, the The second adhesive sheet and the second lenticular plate are stacked in this order and are combined over the entire effective display area.

It is desirable that the Fresnel lens plate forms a Fresnel lens on the surface facing the first lenticular plate.

It is desirable that a lenticular lens be formed on the surface of both of the two lenticular plates facing the Fresnel lens. 2
Lenticular lenses may be formed on both sides of each of the lenticular plates. Both of the two lenticular plates are preferably thinner than the Fresnel lens. Also,
A light-absorbing material may be applied to a portion of the observer side of the first or second lenticular plate, or both, through which effective light does not pass. The first or second lenticular plate, or both, may be provided with light scattering particles within or near the surface. Second
The lenticular plate may include a light absorbing material inside or near the surface facing the viewer.

The adhesive sheet is preferably flat or in close contact with the lenticular lens element.

As a manufacturing method for the above-mentioned transmission screen, two transparent adhesive sheets having adhesive material on both sides are first
The first lenticular plate is placed on top of the Fresnel lens plate so that the adhesive sheet adheres to both sides of the lenticular plate, and then the second lenticular plate is placed on top of the Fresnel lens plate. It is best to overlap the Cura plates.

It is preferable to apply the two adhesive sheets to both sides of the first lenticular plate at the same time. When stacking the lenticular plate on the other side, it is desirable to apply the lenticular plate while bending it.

The above-mentioned transmission screen can be used in a projection type image display device.

Effect: According to the above configuration, the first lenticular plate and the second lenticular plate constitute a lenticular lens that is perpendicular to each other, so that the suitable viewing angle not only in the horizontal direction but also in the vertical direction is efficiently widened. be able to. Furthermore, since the Fresnel lens plate, the first lenticular plate, and the second lenticular plate are bonded together over the entire effective display area with two adhesive sheets, this transmission screen does not generate any voids. Therefore, there is no reduction in resolution. Since the adhesive sheet generates adhesive force at the same time as it comes into contact with the other side, the joining operation is easy.

EXAMPLE Hereinafter, an example of a transmission screen according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows the configuration of a transmission screen in an embodiment of the present invention, where 5 is a Fresnel lens plate, 6 is a first
adhesive sheet, 7 is the first lenticular plate, 8 is the second lenticular plate.
adhesive sheet, 9 is a second lenticular plate, 10 is a Fresnel lens, 1214 is a lenticular lens, 16
is a transparent sheet, and 17.18 is an adhesive material. The transmission screen of the present invention includes, in order from the projector side, a Fresnel lens plate 5, a first adhesive sheet 6, and a first lenticular plate 7.
, a second adhesive sheet 8 and a second lenticular plate 9 are stacked and bonded over the entire effective display area,
An observer is located at a remote location on the second lenticular plate 9 side.

The external dimensions of the transparent screen are 636 mm long and 83 mm wide.
It is 9mm. The Fresnel lens plate 5 is a transparent acrylic resin plate with a concentric Fresnel lens lO formed on the surface on the first lenticular plate 7 side, and the opposite surface 11 is a flat surface, and has a thickness of 3 mm. The pitch of the Fresnel lens 10 is 0.14 mm. First lenticular plate 7
The lenticular lenses 12 are formed on the surface of an acrylic resin plate facing the Fresnel lens plate 5, and the opposite surface 13 is made flat, the thickness is 1.2 mm, and the pitch of the lenticular lenses 12 is 1 mm. be. The second lenticular plate 9 has a lenticular lens 14 formed on the surface of an acrylic resin plate on the Fresnel lens plate 5 side, and has a flat surface 15 on the opposite side, and has a thickness of 1.2 mm. The pitch of the lenses 14 is 0.7 mm. The longitudinal direction of each element of the lenticular lens 12.14 is oriented horizontally and vertically, respectively.

The first adhesive sheet 6 has a thickness of 0. (16) Acrylic adhesive U'17,1B was applied to a thickness of 0.025 mm on both sides of a 4 mm polyester resin transparent sheet 16. Before assembly, the adhesive sheet 6 is covered with release sheets 19 and 20 made of polyester resin coated with silicone resin on both sides of the adhesive sheet 60, as shown in FIG. It is affixed. The second adhesive sheet 8 has the same structure as the first adhesive sheet 6.

The horizontal cross-sectional and vertical cross-sectional configurations of the transmission screen shown in FIG. 1 are shown in FIGS. 3 and 4, respectively. The adhesive material 18 of the first adhesive sheet 6 is attached to the convex portion 2 of the Fresnel lens 10.
The adhesive material 17 adheres to the tip of the convex portion 22 of the lenticular lens 12 of the first lenticular plate 7 . The adhesive material 23 of the second adhesive sheet 8 adheres to the flat surface 13 of the first lenticular plate 7, and the adhesive material 24 of the second adhesive sheet 8 adheres to the flat surface 13 of the first lenticular plate 7.
It adheres to the tip of the convex portion 25 of the lenticular lens 14 of the lenticular plate 9. The adhesive sheet 68 is flat.

1 Runticular plates 7 and 9 are thin and lack mechanical strength, but Fresnel lens plate 5 is thick and has sufficient mechanical strength, and Fresnel lens plates 5 and 2 are bonded by adhesive sheet 1-6.8.
Since the two lenticular plates 79 are always connected over the entire effective display area, the transmission screen shown in FIG. 1 has sufficient mechanical strength, and the Fresnel lens plate 5 and the first lenticular No gap is generated between the first lenticular plate 7 and the second lenticular plate 9. Also, lenticular plate 7.
Since 9 is thin, even if an attempt is made to create a dimensional difference between the Fresnel lens plate 5 and the first and second lenticular plates 7.9, the lenticular plate 7.9 has a strong mechanical strength. It shows dimensional changes following the curve, and the whole does not warp significantly.

Since the lenticular lenses 12 and 14 are orthogonal to each other, the suitable viewing angle in the horizontal and vertical directions can be efficiently widened.

Since the lenticular lens 12.14 is directed toward the projector and the rays passing through the lenticular plate 7.9 are refracted on each surface, the direction of the rays can be efficiently changed, thereby widening the suitable viewing angle. be able to. Further, since the Fresnel lens 10 is directed toward the viewer side L-1 and the light beam passing through the Fresnel lens plate 5 is refracted on two surfaces, the transmission efficiency of the peripheral portion of the Fresnel lens plate 5 is also good.

A method of bonding the Fresnel lens plate 5 and the two lenticular plates 7 and 9 using the adhesive sheet 6.8 will be explained. In this manufacturing method, in the first step, adhesive sheets 1-6.
8 on both sides of the first lenticular plate 7, in the second step the lenticular plate 7 is bonded onto the Fresnel lens plate 5, and in the third step the lenticular plate 9 is attached to the first lenticular plate 7. It is to be pasted on top of. Operations from the first stage to the third stage are performed using common manufacturing equipment.

FIG. 5 shows the configuration of the manufacturing apparatus, and shows the state at the first stage. The first material supply roller 26 is wound with a pressure-sensitive adhesive sheet 6 having a release sheet) 19.20 affixed on both sides, and the second material supply roller 27 is wrapped with a release sheet 2) on both sides.
8. The adhesive sheet 8 with 29 attached is rolled up. The first and second winding rollers 30 and 31 are for winding up the release sheet 192B, respectively. The two pressure rollers 32 and 33 are used to uniformly adhere the adhesive sheet 68 to both sides of the first lenticular plate 7 in the first stage, and to apply a Fresnel plate to the first lenticular plate 7 in the second stage. The second lenticular plate 9 is bonded to the lens plate 5 and the second lenticular plate 9 is bonded to the first lenticular plate 7 in a third step. Main shaft 34 of lower pressure roller 32
is fixed, and the main shaft 35 of the upper pressure roller 33 is pushed downward by a spring to apply a constant pressure to something inserted between the two pressure rollers 3233. The pressure roller 3233 rotates at a constant speed, and the material supply roller 2627 and the take-up roller 30,
31 rotates independently of pressure rollers 32 and 33.

The first step is as follows. A first lenticular plate 7 cut into a predetermined size is prepared, and the material supply roller 26
, 27 are wrapped with adhesive sheet 1-6.8. Turn over the ends of the peeling sheets h19.
Wind it up to 0.31.

The exposed portions of the adhesive material 17.23 of the adhesive sheet 6.8 are respectively adhered to the ends of both sides of the first lenticular plate 7, and inserted between the two pressure rollers 32, 33. 33 at a constant speed to remove the adhesive sheet 6.
．． 8 is adhered to the first lenticular plate 7. At this time, the material supply rollers 26, 27 are replaced by the pressure rollers 32, 33.
Since the pressure rollers 32 and 33 rotate independently of each other, if the pressure of the pressure rollers 32 and 33 is kept low, the adhesive sheet 6.8 will be pulled to form a flat surface. It is preferable to make the adhesive sheet 6.8 a little larger than the first lenticular plate 7, and remove unnecessary portions around the adhesive sheet 6.8 after adhesion is completed.

The second step is as follows. Turn over all the release sheets 20 attached to the adhesive sheet 6, and attach the Fresnel lens plate 5.
The first lenticular plate 7 is placed on top of the first lenticular plate 7 in order from the end and inserted between the pressure rollers 32 and 33. pressure roller 32,
When the lens 33 is rotated at a constant speed, the first lenticular plate 7 is uniformly bonded onto the Fresnel lens plate 5. At this time, the material supply rollers 26, 27 and the take-up rollers 30, 31 are always stopped.

If the third step is carried out in the same manner as the second step, the transmission screen shown in FIG. 1 will be completed.

Note that when stacking the first and second lenticular plates 79 on the other side, it is easier to stack the lenticular plates 79 while slightly warping the lenticular plates 79. For this purpose, it is preferable to make the first and second lenticular plates 7.9 thinner than the Fresnel lens plate 5.

With the above method, the adhesive sheet 6.8 generates adhesive force as soon as it comes into contact with the other party, so the joining operation is very easy. The parts of the adhesive material 17.1824 that are in contact with the other side are the convex part 21 of the Fresnel lens 10, the convex part 22 of the lenticular lens 12, and the convex part 2 of the lenticular lens 14.
Although only the tips of the lenses 5 and 5 have a very large overall contact area, the Fresnel lens 5 and the first and second lenticular plates 7.9 can be firmly connected. Furthermore, since the adhesive sheet 6.8 is flat, the adhesive sheet 6.8 evenly adheres to the other side without causing any unevenness.

When the adhesive sheet 6 is attached to the Fresnel lens plate 5 first,
There were cases where unevenness occurred in some areas.

This is because the tip of the convex portion 21 of the Fresnel lens 10 is sharp,
This is considered to be because a step is generated in a part of the adhesive sheet 6 or the adhesive material 17. No unevenness was observed when the adhesive sheet 6 was first attached to the first lenticular plate 7. Also, if the adhesive sheet 8 is attached to the second lenticular plate 9 first, bubbles will be generated between the first and second lenticular plates 7.9, so the adhesive sheet 8 is attached to the first lenticular plate 9 first. It is preferable to attach it to the flat surface 13 of the plate 9.

The adhesive sheet 6.8 is attached to the first lenticular plate 7 at the same time, but this prevents the adhesive material 17.23 from adhering to the pressure horn rollers 32.33 (and improves work efficiency).

Next, a projection type image display device using the transmission type screen shown in FIG. 1 will be explained. Figure 4 shows its schematic configuration. Transparent screen 3 on the front of cabinet 36
7, a projector 38 consisting of a video tube and a projection lens is placed at the bottom, a first mirror 39 is placed at the front side of the bottom,
A second mirror 40 is placed in the center. As the projector 38, a slide projector or an image display device using high-resolution light pulp can also be used. The transmission screen 37 is the same as that shown in FIG. 1, and has an effective display area of 610 mm in length and 813 mm in width, and the longitudinal direction of the lenticular lenses of the second lenticular plate is oriented in the vertical direction. Since the lens is provided with lenticular lenses that are orthogonal to each other, it is possible to efficiently widen the suitable viewing angle not only in the horizontal direction but also in the vertical direction. Furthermore, since no voids are generated even when there are changes in temperature or humidity, a projected image of the best image quality can always be obtained.

Another embodiment of the present invention will be described. There are many possible modifications to the lenticular plate 7.9 of the transmission screen shown in FIG.
Effects can be obtained.

The transmission screen shown in FIG. 7 has lenticular lenses 42 and 43 formed on both surfaces of a second lenticular plate 410, the longitudinal directions of which are oriented vertically. As shown in FIG. 8, when parallel light enters the lenticular lens 42 obliquely with respect to the optical axis 44,
The principal ray 45 is aligned with the optical axis 44 by the lenticular lens 43.
It emits parallel to the Therefore, when the three-tree projection lens is arranged horizontally in-line, the color change when the viewer changes the viewing angle is very small compared to the configuration shown in FIG. 1. The transmission screens shown in FIGS. 9 and 10 each have a first
The second lenticular plate 9.4 shown in FIGS.
A light-absorbing material (46°4) is coated on the side of the observer (1) through which the effective light does not pass. This light absorbing substance 46
Since the angle 47 absorbs external light and reduces reflected light, it is possible to prevent the contrast of the projected image from decreasing by 1 or more due to external light. Furthermore, if a light-absorbing material is applied to the observer side surface 13.49 of the first lenticular plates 7, 48 shown in FIGS. 9 and 10, where light does not pass through, the contrast decrease due to external light can be prevented. It can be further improved. Further, by providing a light absorbing material inside the second lenticular plate 9 or near the surface on the viewer's side, it is possible to suppress a decrease in contrast due to external light.

The first lenticular plate 7 shown in FIG. 1 can be replaced with one in which lenticular lenses are formed on both sides, and the light distribution characteristics can be freely controlled by changing the shape of the lenticular lenses on both sides. can. When light-scattering particles are provided inside or near the surface of the first or second lenticular plates 7, 9, the light-scattering particles are used to reduce unevenness caused by surface shape variations. Machining accuracy can be reduced.

In FIG. 1, a Fresnel lens 10 of a Fresnel lens plate 5 is shown.
is formed on the first lenticular plate 7 side, but if the projection angle of view of the projector is small, a Fresnel lens may be formed on the projector side. Further, each lenticular lens of the first or second lenticular plates 7, 9 can be formed on the projector side, the observer side, or both sides. The longitudinal direction of each lenticular lens element of each lenticular plate 7.9 may be chosen in any manner as long as one is vertical and the other is horizontal. However, in order to sufficiently widen the suitable viewing angle in the horizontal direction, a lenticular lens with the longitudinal direction of the element oriented vertically is formed on the surface of the first or second lenticular plate 79 on the Fresnel lens plate 5 side. In order to make the vertical viewing angle sufficiently wide, the first or second lenticular plate 7,
It is desirable to form a lenticular lens with the longitudinal direction of the element oriented horizontally on the surface of Fresnel lens plate 9 of 9. Note that when the other side to which the adhesive sheet is attached is a flat surface, it is preferable to attach the adhesive sheet to the flat surface first in order to avoid the inclusion of air bubbles.

In the configuration shown in FIG. 1, the adhesive sheet 6.8 is flat, but the adhesive sheet 50 may be in close contact with the first lenticular lens 51 as shown in FIG. . If the outer circumference of the pressure roller 33 shown in FIG. 3 is made of rubber and the pressure of the pressure rollers 32 and 33 is increased, the configuration shown in FIG. 9 can be easily realized. This reduces the interface with air, so the transmittance improves, albeit slightly. Furthermore, in the eleventh configuration, even when the direction of the Fresnel lens plate 5 is reversed, the adhesive sheet 5
Even if the Fresnel lens plate 5 and the lenticular plate 7 are bonded after the lens 0 is attached to the lenticular plate 7 first, air bubbles will not be mixed in.

Effects of the Invention Since the present invention is configured as described above, it produces the effects described below.

The transmission screen of the present invention includes a Fresnel lens plate and a first
and the second lenticular plate are bonded together over the entire effective display area using two adhesive sheets, so there is no gap between them, and even if there are changes in temperature or humidity, the resolution will not deteriorate. do not have. Further, since the light-transmitting plate is thick and has sufficient mechanical strength, a transmission screen having sufficient mechanical strength can be realized.

Furthermore, by using this transmissive screen, it is possible to provide a projection type image display device that has a wide suitable viewing angle in the horizontal and vertical directions and always has the best resolution.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a transmission screen in an embodiment of the present invention, FIG. 2 is a sectional view showing the configuration of an adhesive sheet, and FIGS. A cross-sectional view showing a horizontal cross section and a vertical cross section of the mold screen, FIG. 5 is a route diagram showing the schematic configuration of the transmission screen manufacturing apparatus shown in FIG. 1, and FIG. 6 is a cross-sectional view showing the transmission screen shown in FIG. 1. FIG. 7 is a cross-sectional view showing the configuration of a transmission screen according to another embodiment of the present invention, and FIG. Between the lines to explain the action of the Cura plate,
FIGS. 9, 10, and 11 are sectional views showing the structure of a transmission type screen according to still another embodiment of the present invention, and FIG. 12 is a sectional view showing the structure of a conventional transmission type screen. 5...Fresnel lens plate, 6...1st
adhesive sheet, 7... first lenticular plate, 8... second adhesive sheet, 9... second lenticular plate, 10... ... Fresnel lens, 12.14 ... Lenticular lens, 1
6...Transparent sheet, 17°18...Adhesive material, 26.27...Material supply roller, 30.
31... Winding roller, 32.33...
...Pressure roller, 36...Cabinet, 37
. . . Transmissive screen, 38 . . . Projector, 41 . . . Second lenticular plate, 46.
47... Light absorbing substance, 48... First lenticular plate. Name of agent: Patent attorney Shigetaka Awano 1 person 2nd figure

Claims (17)

[Claims] (1) comprising a Fresnel lens plate, first and second lenticular plates, and first and second adhesive sheets that have an adhesive material on their screens and are translucent; The lenticular lenses are orthogonal to each other and overlap in the order of the Fresnel lens plate, the first adhesive sheet, the first lenticular plate, the second adhesive sheet, and the second lenticular plate, and form an effective display area. Transparent screen integrated throughout. (2) The transmission screen according to claim 1, wherein the Fresnel lens plate has a Fresnel lens formed on a surface facing the first lenticular plate. (3) Claim (1) wherein the first lenticular plate has a lenticular lens formed on its surface on the Fresnel lens side.
Transparent screen as described. (4) Claim (1) wherein the second lenticular plate has a lenticular lens formed on its surface on the Fresnel lens side.
Transparent screen as described. (5) The transmission screen according to claim 1, wherein each of the first and second lenticular plates has a lenticular lens formed on a surface facing the Fresnel lens. (6) The transmission screen according to claim (3), wherein the first lenticular plate has lenticular lenses formed on both sides. (7) The transmission screen according to claim (4), wherein the second lenticular plate has lenticular lenses formed on both sides. (8) The transmissive screen according to claim (1), further comprising a light-absorbing material in a portion of the observer's side of the first or second lenticular plate, or both, through which effective light does not pass. (9) Claim (1) wherein the first or second lenticular plate or both are provided with light scattering particles inside or near the surface.
Transparent screen described in ). (10) The transmission screen according to claim (1), wherein the second lenticular plate includes a light absorbing material inside or near the surface on the viewer side. (11) The transmission screen according to claim (1), wherein each of the two lenticular plates is thinner than the Fresnel lens plate. (12) The transmission screen according to claim (1), wherein the first or second adhesive sheet or both are flat. (13) The transmission screen according to claim (1), wherein the first or second adhesive sheet or both are in close contact with the lenticular lens element. (14) Two translucent adhesive sheets having adhesive material on both sides are attached to both sides of the first lenticular plate, and then the adhesive sheets are attached to the other side,
A method of manufacturing a transmission screen, wherein the first lenticular plate is stacked on a Fresnel lens plate, and the second lenticular plate is stacked on top of the first lenticular plate. (15) Claim (14) wherein two adhesive sheets are simultaneously attached to both sides of the first lenticular plate.
) The method for manufacturing a transmission screen described in . (16) When attaching the lenticular plate to the other side,
15. The method of manufacturing a transmission screen according to claim 14, wherein the lenticular plate is pasted while being warped. (17) A projection type image display device using the transmission screen according to claim (1).