JP2008096713A - Light transmissive screen and method of manufacturing light diffusion part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light transmissive screen which prevents the deterioration in brightness, resolution and contrast due to diffusion function and is excellent in image quality. <P>SOLUTION: The light transmissive screen having a light diffusion part 4 which condenses and transmits incident image signal light rays to a light transmissive flat plate substrate 1 has: stereoscopic light shielding layers 2 which are arranged side by side on the image signal light incident side of the light transmissive flat plate 1 longitudinally in the vertical direction and has cross-sections of an isosceles triangle shape; and cylindrical lenses 33 which are arranged side by side on the light transmissive flat plate substrate 1 longitudinally in the horizontal direction, wherein image signal light which is reflected and diffused in the horizontal direction by the stereoscopic light shielding layers 2 is condensed and diffused in the vertical direction by the cylindrical lenses 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light transmissive screen having a function of diffusing and transmitting video light, and a method of manufacturing a light diffusing portion, which are used in rear projection televisions and projectors.

  A general configuration of a rear projection television or projector is shown in FIG. The video signal light generated by the projection engine 10 is projected onto the light transmissive screen 12 by a plurality of mirrors 11 and a projection lens 15.

  FIG. 9 shows a general configuration of a light transmissive screen 12 used in a rear projection television or projector. FIG. 9A shows a general configuration diagram of a light transmission screen 12 using a light shielding layer 8 having a planar shape, and FIG. 9B shows a three-dimensional light shielding layer whose section is an isosceles triangle. 2 shows a general configuration diagram of a light-transmissive screen 12 using 2. FIG. The light transmissive screen 12 is constituted by a combination of a pair of lens sheets 13 and a Fresnel lens sheet 14 as shown in FIGS. The projection engine 10 corrects the image light projected in the direction of diffusive oblique light on the Fresnel lens sheet 14 so that the image light enters the lens sheet 13 almost perpendicularly. Further, image light is imaged and diffused by the lens sheet 13, and the image is viewed on the viewer side.

  The lens sheet 13 forms image light with an array of a plurality of lenses such as the lenticular lens 3 and diffuses the image light in a predetermined range. However, in the lens sheet 13 having a configuration in which the convex lens-shaped lenticular lens 3 and the solid light-shielding layer 2 having a cross section of an isosceles triangle are arranged in parallel in the horizontal direction, the image light cannot be diffused in the vertical direction.

  As a method for imparting a diffusing function, light diffusing fine particles 16 having a refractive index different from that of the light transmissive flat plate base material 1 are dispersed and blended in the light transmissive flat plate base material 1 formed of a light transmissive resin. And is generally used as the light transmission screen 12.

  As a specific means for obtaining diffusion characteristics using the light diffusing fine particles 16, one kind or two or more kinds of light diffusing fine particles 16 are provided inside the light transmissive flat plate substrate 1 provided with the lenticular lens 3. A method for improving the viewing angle characteristic by diffusing video light and diffusing video light in the vertical direction has also been proposed (see, for example, Patent Document 1).

  However, in the conventional transmissive screen 12 shown in FIGS. 9A and 9B, image light can be obtained by using a large amount of light diffusing fine particles 16 dispersed and blended in the light transmissive flat substrate 1. However, there is a problem that the resolution and brightness are reduced due to irregular reflection on the light diffusing fine particles 16, and further, the contrast is remarkably deteriorated due to irregular reflection of external light on the light diffusing fine particles 16.

  As a method for improving the reduction in resolution and contrast and improving the viewing angle characteristics, a vertical lenticular sheet and a horizontal lenticular sheet are provided, and the horizontal and vertical viewing angles are set as separate lenticular sheets. A method of enlarging has been proposed.

  FIG. 10 shows a first conventional example in which the viewing angle is enlarged by two lenticular sheets on which cylindrical lenses are formed. In FIG. 10, a Fresnel lens sheet 14, a horizontal lenticular sheet 30, and a vertical lenticular sheet 31 are provided in this order from the image signal light incident surface side.

  In the vertical lenticular sheet 31, a vertical cylindrical lens 33 having a horizontal direction as a longitudinal direction is arranged in parallel on the image signal light incident surface side, and a light shielding layer 8 having a horizontal direction as a longitudinal direction on the image light output surface side. Is provided.

  On the horizontal lenticular sheet 30, horizontal cylindrical lenses 32 having a vertical direction as a longitudinal direction are arranged in parallel on the image signal light incident surface side, and a light shielding layer pattern 8 having a vertical direction as a longitudinal direction on the image light emitting surface side is formed. Is provided.

  The video signal light incident from the video signal light side is deflected by the Fresnel lens sheet 14 into light substantially perpendicular to the horizontal lenticular sheet 30 and is incident on the horizontal lenticular sheet 30 in which horizontal cylindrical lenses 32 are arranged in parallel. To do. The video signal light incident on the horizontal lenticular sheet 30 is condensed and diffused in the horizontal direction by the horizontal cylindrical lens 32 to enlarge the viewing angle in the horizontal direction.

Further, the vertical lenticular sheet 31 in which the vertical cylindrical lenses 33 are arranged in parallel condenses and diffuses in the vertical direction and expands the viewing angle also in the vertical direction. (For example, see Patent Document 2.)
Next, FIG. 11 shows a second conventional example in which the viewing angle is expanded by two lenticular sheets on which a three-dimensional light shielding layer is formed.

In FIG. 11, in order from the image signal light incident surface side,
A Fresnel lens sheet 14, a vertical lenticular sheet 31, and a horizontal lenticular sheet 30 are provided.

  In the vertical lenticular sheet 31, vertical solid light shielding layers 35 having a cross section with an isosceles triangle in the horizontal direction are arranged in parallel.

  On the horizontal lenticular sheet 30, horizontal solid light shielding layers 34 whose cross-sections with the vertical direction as the longitudinal direction are isosceles triangles are arranged in parallel.

  The video signal light incident from the video signal light side is deflected by the Fresnel lens 14 to a substantially vertical light with respect to the vertical lenticular sheet 31, and a vertical solid light-shielding layer 35 having an isosceles triangular cross section is arranged in parallel. The light enters the vertical lenticular sheet 31. The video signal light incident on the vertical lenticular sheet 31 is reflected and diffused in the vertical direction by the vertical solid light shielding layer 35 having a cross section of an isosceles triangle, and the viewing angle in the vertical direction is expanded.

Further, the horizontal lenticular sheet 30 in which horizontal solid light-shielding layers 34 whose cross sections are isosceles triangles are arranged in parallel reflects and diffuses in the horizontal direction, and widens the viewing angle in the horizontal direction. (For example, refer to Patent Document 3.)
Japanese Patent Laid-Open No. 2-157735 Japanese Patent Laid-Open No. 8-101459 JP 2004-4148 A

In the first conventional example in which the viewing angle is enlarged by two lenticular sheets on which cylindrical lenses shown in FIG. 12 are formed,
The light transmissive screen 12, which is configured by sequentially stacking a horizontal lenticular sheet 30 and a vertical lenticular sheet 31 with a cylindrical lens facing the image signal light incident side, allows incident light to be incident on the vertical lenticular sheet 31. Since it can be refracted and diffused, the vertical viewing angle can be greatly expanded without the assistance of diffusing fine particles.

  In addition, since the cylindrical lenses are arranged in parallel on one side of separate sheets for horizontal and vertical, the horizontal and vertical viewing angles can be expanded. However, in the configuration of the first conventional example shown in FIG. 12, since two lenticular sheets are used, the light transmission efficiency is lowered, and further, the member cost and the man-hour are increased, so that the cost competitiveness is lowered. Further, since the light shielding layer 8 surface that hits the image light exit surface of the horizontal lenticular sheet 30 and the vertical cylindrical lens 33 that hits the image light entrance surface of the vertical lenticular sheet 31 overlap, When transmittance loss due to reflection occurs, there is a problem.

  Also in the second conventional example shown in FIG. 13 in which the viewing angle is expanded by two lenticular sheets having a three-dimensional light-shielding layer having an isosceles triangular section, 2 formed by the cylindrical lens shown in FIG. As in the first conventional example using a single lenticular lens, since two lenticular sheets are used, the transmission efficiency of the video signal light is reduced, and the member cost and man-hours are increased, resulting in cost competitiveness. Had the problem of decreasing.

  The present invention solves the above-described conventional problems. The light transmissive screen 12 is excellent in transmission efficiency of video signal light, and even when an image is observed while changing the viewing angle regardless of the horizontal and vertical directions. The objective is to provide a low-cost, high-quality light-transmissive screen that does not feel uncomfortable.

In order to solve the above-described conventional problems, the light transmissive screen according to the present invention is a light transmissive screen having a light diffusing portion that collects and transmits an incident video signal light beam on a light transmissive flat plate substrate. A three-dimensional light shielding layer having an isosceles triangular cross section provided in parallel with the longitudinal direction as the longitudinal direction on the image signal light incident side of the transparent flat plate base material, and the horizontal direction on the light transparent flat plate base material as the longitudinal direction The image signal light reflected and diffused in the horizontal direction by the three-dimensional shading layer is condensed and diffused in the vertical direction by the cylindrical lens. is there.

  The light diffusing part manufacturing method of the present invention is a method for manufacturing a light diffusing part that diffuses light in a horizontal direction and a vertical direction that are integrally formed with a light transmissive flat plate base material. A cylindrical lens is formed in parallel on one surface by extrusion molding, and a three-dimensional light shielding layer having a cross section of an isosceles triangle in a direction perpendicular to the length direction of the lens is formed into a flat shape on the cylindrical lens in a stripe shape. It is characterized by forming.

  The light diffusing part manufacturing method of the present invention is a method for manufacturing a light diffusing part that diffuses light in a horizontal direction and a vertical direction that are integrally formed with a light transmissive flat plate base material. A cylindrical lens is formed in parallel on one surface by extrusion molding, and a three-dimensional light shielding layer having an isosceles triangular cross section in a direction perpendicular to the length direction of the cylindrical lens is formed on the other surface of the light transmissive flat plate base material. It is characterized by being formed into a stripe shape by flat molding.

  The present invention solves the above-described conventional problems, and according to the transmission screen of the present invention, the video signal light has excellent transmission efficiency, and the image is observed while changing the viewing angle regardless of the horizontal and vertical directions. However, it is possible to realize a high-quality light transmissive screen at a low cost with a small number of members so that the observer does not feel uncomfortable.

  Embodiments of the light transmissive screen of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a configuration diagram of a light transmission screen according to the first embodiment of the present invention.
The light transmissive screen 12 is composed of a Fresnel lens sheet 14 and a light transmissive flat substrate 1. The Fresnel lens sheet 14 is disposed on the video signal light incident side, and the light-transmissive flat plate substrate 1 is disposed on the viewer side.

  The Fresnel lens sheet 14 includes a Fresnel lens having a sawtooth cross section formed concentrically on the image signal light emission surface side, and the image signal light emitted from the projection lens is light transmissive by light refraction by the Fresnel lens. The flat substrate 1 has a function of converting it into substantially vertical light.

  The light transmissive flat plate substrate 1 includes a light diffusion portion 4 on the image light incident surface side. The light diffusing unit 4 is formed of a horizontal solid-state light-shielding layer 34 on an isosceles triangle and a vertical cylindrical lens 33 having a horizontal direction as a longitudinal direction. ing.

  Next, the light diffusion unit 4 will be described with reference to the schematic diagram shown in FIG. The light diffusing unit 4 includes a horizontal solid light-shielding layer 34 having a shape of an isosceles triangle in a plurality of rows arranged in parallel with the vertical direction as a longitudinal direction on the image signal light incident surface side of the light transmissive flat plate base material 1 in a stripe shape. There is a function of reflecting and diffusing only the horizontal direction of the video signal light that has become substantially vertical light with respect to the light diffusion portion 4 by the Fresnel lens sheet 14. The image signal light incident on the three-dimensional light shielding layer 34 is totally reflected by the inclined surface of the three-dimensional light shielding layer 34, that is, the image signal light diffused in the horizontal direction is transmitted through the vertical silicadle lens portion serving as an opening, and is light transmissive. The diffusing particles 16 in the flat substrate 1 diffuse in the horizontal direction.

  Similarly, a vertical cylindrical lens 33 having a horizontal direction as a longitudinal direction is formed in a light transmitting portion between the horizontal solid light shielding layers 34 arranged in a stripe shape on the image light incident surface side of the light transmitting flat plate base material 1. Yes. The vertical cylindrical lenses 33 are arranged in parallel in the vertical direction and have a function of condensing and diffusing incident video signal light in the vertical direction.

  That is, the video signal light totally reflected by the inclined portion of the horizontal three-dimensional light shielding layer 34 and reflected and diffused in the horizontal direction is transmitted through the vertical cylindrical lens 33 serving as an opening, and further condensed and diffused in the vertical direction.

  When the light diffusing fine particles 16 are dispersed and blended in the light transmissive flat plate base material 1, the image signal light diffused in the horizontal and vertical directions by the horizontal three-dimensional light shielding layer 34 and the vertical cylindrical lens 33 is the light diffusing fine particles. 16 further diffuses in all directions. Since light is diffused in the horizontal and vertical directions by the horizontal solid light-shielding layer 34 and the vertical cylindrical lens 33, it is also possible to use the light-transmitting flat plate substrate 1 in which light diffusing fine particles are not dispersed and blended.

  The horizontal solid light-shielding layer 34 having an isosceles triangular cross section is made of a light-shielding or light-absorbing material, and is formed on the image signal light incident side of the light-transmissive flat plate base material 1 by molding.

  In order to reduce the occurrence of moire due to lens interference with respect to the resolution of the video signal light, the lens system is required to have a resolution of 2 to 5 times that of the normal video signal. Therefore, in order to reduce the occurrence of moire due to the interference of the resolution of the light diffusing unit 4 with the video signal light, the horizontal three-dimensional light blocking layer 34 and the vertical cylindrical lens 33 are two to five times larger than the video signal light. In general, they are arranged so that a resolution of about double is obtained, and they are provided in stripes at a pitch of about 50 μm to 300 μm.

  The horizontal solid light shielding layer 34 having a cross section of an isosceles triangle is shaped so as to be wide with respect to the viewer side, and has a function of suppressing the reflection of external light and improving the contrast of the screen. A material obtained by dispersing and blending a black pigment in a urethane resin or an epoxy resin is used.

  The vertical cylindrical lens 33 provided in parallel with the horizontal direction as the longitudinal direction can be formed by extrusion molding. The vertical cylindrical lens 33 is made of a light-transmitting resin and collects and diffuses image light.

  The vertical cylindrical lens 33 is formed in an opening serving as a light transmission portion of the horizontal stereoscopic light shielding layer 34, and the horizontal stereoscopic light shielding layer 34 and the vertical silica lens 33 are disposed on the image signal light incident surface side of the light transmissive flat plate base material 1. Is formed.

  The light-transmitting flat plate substrate 1 is usually made of PMMA having a refractive index of 1.49 or MS resin (polymer of styrene and MMA) having a refractive index of about 1.52. In order to further improve the diffusing performance, the light diffusing fine particles 16 having a diameter of about 10 μm or less can be dispersed in the light transmissive flat plate substrate 1 at a volume ratio of 10% or less as necessary. As the light diffusing fine particles 16, beads made of MS resin having a refractive index higher than that of the base material are generally used. The refractive index of the MS resin material used for the light transmissive flat substrate 1 and the light diffusing fine particles 16 can be changed by changing the blending ratio of the PMMA resin having a refractive index of about 1.49 and the styrene resin having a refractive index of about 1.59. , 1.49 to 1.59. Such light diffusing fine particles 16 have the effect of expanding the viewing angle characteristics in all directions, but lead to a decrease in resolution and contrast due to a decrease in transmittance and irregular reflection of the video signal light by the light diffusing fine particles 16. Therefore, as shown in the first embodiment, when both horizontal and vertical viewing angles are diffused by the vertical cylindrical lens 33 or the horizontal three-dimensional light shielding layer 34, the light diffusibility in the light-transmissive flat plate base material 1 is obtained. It is also possible to exclude the fine particles 16.

FIG. 3 shows a manufacturing process of the light diffusing portion 4 of the light transmissive screen 12 according to the first embodiment of the present invention.
First, FIG. 3A shows an extrusion process as a first process. The extrusion molding is composed of two roll-shaped molds, and in order to form the vertical cylindrical lens 33 in one roll-shaped mold 5, the mold surface has a concave shape 6 with a curved surface.
The substrate of the light-transmitting flat plate substrate 1 such as PMMA or MS resin (polymer of styrene and MMA) is formed by extruding the vertical cylindrical lenses 33 in a parallel arrangement in a stripe shape.
FIG. 3B shows a flat molding process as the second process. In the flat mold 7, the flat surface has a concave shape 9 having an isosceles triangle in order to form a solid light-shielding layer having an isosceles triangle cross section. By the step (a), the three-dimensional light shielding layer material is formed into an isosceles triangular concave shape 9 with respect to the substrate of the light-transmitting flat plate substrate 1 formed by arranging the vertical cylindrical lenses 33 in parallel in a stripe shape. A horizontal solid-state light-shielding layer 34 having an isosceles triangle cross-section in a direction orthogonal to the arrangement of the vertical cylindrical lenses 33 is formed on the same surface side where the vertical cylindrical lenses 33 are molded by the filled flat molding. Are formed in a parallel arrangement in stripes by the adhesive force of the forming step.

  The effect of the vertical viewing angle characteristic in the first embodiment of the present invention will be described based on the simulation result shown in FIG.

  FIG. 7 shows a simulation result about the effect on the vertical viewing angle of the vertical cylindrical lens 33 whose longitudinal direction is the horizontal direction in the first embodiment. The volume content of the light diffusing fine particles 16 is calculated in the cases of 2% and 4%.

  As shown in FIG. 7, in the configuration including the vertical cylindrical lens 33, when the volume content of the light diffusing fine particles 16 is 4%, the α angle (viewing angle at which the front luminance is 50%) is 10.2 degrees. When the volume content of the light diffusing fine particles 16 is 2%, the α angle is 8.0 deg. Further, as shown in FIG. 7, the vertical viewing angle by only the light diffusing fine particles 16 is an α angle of 6.5 deg and the light diffusing fine particles 16 are contained in a volume when the volume fraction of each light-emitting linear particle 16 is 4%. When the rate is 2%, the α angle is 3.9 deg. When the vertical cylindrical lens 33 is provided, there is an effect of improving the viewing angle characteristics of about 1.5 to 2 times. The effect of enlarging the viewing angle in the direction was confirmed.

    Hereinafter, an embodiment of a transmission screen in Example 2 of the present invention will be described in detail with reference to the drawings.

  FIG. 4 shows a configuration diagram of a light transmission type screen according to the second embodiment of the present invention. The light transmissive screen 12 is composed of a Fresnel lens sheet 14 and a light transmissive flat substrate 1. The Fresnel lens sheet 14 is disposed on the video signal light incident side, and the light-transmissive flat plate substrate 1 is disposed on the viewer side.

  The Fresnel lens sheet 14 includes a Fresnel lens having a sawtooth cross section formed concentrically on the image signal light emission surface side, and the image signal light emitted from the projection lens is light transmissive by light refraction by the Fresnel lens. The flat substrate 1 has a function of converting it into substantially vertical light.

  The light transmissive flat plate substrate 1 includes a horizontal light diffusing unit 17 on the image light incident surface side and a vertical light diffusing unit 18 on the image light emitting surface side.

  The horizontal light diffusing unit 17 is formed with a horizontal solid light-shielding layer 34 having an isosceles triangular cross section arranged in parallel with the vertical direction as a longitudinal direction on the image signal light incident surface side.

  The vertical light diffusing unit 18 is formed with a plurality of vertical cylindrical lenses 33 arranged in parallel with the horizontal direction as the longitudinal direction on the video signal light emission surface side.

  Next, the horizontal light diffusing unit 17 and the vertical light diffusing unit 18 will be described with reference to the schematic diagram shown in FIG. The horizontal light diffusing unit 17 has a horizontal solid-state light-shielding layer 34 having a isosceles triangular cross section arranged in parallel with the vertical direction as a longitudinal direction on the image signal light incident surface side of the light-transmissive flat plate base material 1 in a stripe shape. It has a function of reflecting and diffusing only the horizontal direction of the video signal light that has become substantially vertical light with respect to the horizontal direction diffusion portion 17 by the Fresnel lens sheet 14.

  The vertical light diffusing unit 18 is provided with a plurality of vertical cylindrical lenses 33 arranged in parallel with the horizontal direction as the longitudinal direction on the image signal light emitting surface side of the light-transmissive flat plate base material 1 in the form of stripes. It has a function of condensing and diffusing only in the vertical direction.

  That is, the image signal light totally reflected by the inclined portion of the horizontal three-dimensional light shielding layer 34 and reflected and diffused in the horizontal direction is transmitted through the vertical cylindrical lens 33 formed on the image signal light emitting surface side of the light transmissive flat plate base material 1. Further, the light is diffused and diffused in the vertical direction.

  When the light diffusing fine particles 16 are dispersed and blended in the light transmissive flat plate base material 1, the video signal light reflected and diffused in the horizontal direction by the horizontal three-dimensional light shielding layer 34 is further omnidirectionally directed by the light diffusing fine particles 16. Is diffused. Further, the light is diffused by the vertical cylindrical lens 33 in the vertical direction. Since light is diffused in the horizontal and vertical directions by the horizontal solid light-shielding layer 34 and the vertical cylindrical lens 33, it is also possible to use the light-transmitting flat plate substrate 1 in which light diffusing fine particles are not dispersed and blended.

  The horizontal solid light-shielding layer 34 having an isosceles triangular cross section is made of a light-shielding or light-absorbing material, and is formed on the image signal light incident side of the light-transmissive flat plate base material 1 by molding.

  In order to reduce the occurrence of moire due to lens interference with respect to the resolution of the video signal light, the lens system is required to have a resolution of 2 to 5 times that of the normal video signal. Therefore, in order to reduce the occurrence of moire due to the interference of the resolution of the horizontal light diffusing unit 17 and the vertical light diffusing unit 18 with respect to the video signal light, the horizontal three-dimensional light blocking layer 34 and the vertical cylindrical lens 33 are It is generally arranged so as to obtain a resolution of about 2 to 5 times that of video signal light, and is provided in stripes at a pitch of about 50 μm to 300 μm.

  The horizontal solid light shielding layer 34 having a cross section of an isosceles triangle is shaped so as to be wide with respect to the viewer side, and has a function of suppressing the reflection of external light and improving the contrast of the screen. A material obtained by dispersing and blending a black pigment in a urethane resin or an epoxy resin is used.

  The vertical cylindrical lens 33 provided in parallel with the horizontal direction as the longitudinal direction can be formed by extrusion molding. The vertical cylindrical lens 33 is made of a light-transmitting resin and collects and diffuses image light.

  The vertical cylindrical lens 33 is formed on the image light emitting side of the light transmissive flat plate base material 1 and is formed integrally with the light transmissive flat plate base material 1 together with the horizontal three-dimensional light shielding layer 34.

  The light-transmitting flat plate substrate 1 is usually made of PMMA having a refractive index of 1.49 or MS resin (polymer of styrene and MMA) having a refractive index of about 1.52. In order to further improve the diffusing performance, the light diffusing fine particles 16 having a diameter of about 10 μm or less can be dispersed in the light transmissive flat plate substrate 1 at a volume ratio of 10% or less as necessary. As the light diffusing fine particles 16, beads made of MS resin having a refractive index higher than that of the base material are generally used. The refractive index of the MS resin material used for the light transmissive flat substrate 1 and the light diffusing fine particles 16 can be changed by changing the blending ratio of the PMMA resin having a refractive index of about 1.49 and the styrene resin having a refractive index of about 1.59. , 1.49 to 1.59. Such light diffusing fine particles 16 have the effect of expanding the viewing angle characteristics in all directions, but lead to a decrease in resolution and contrast due to a decrease in transmittance and irregular reflection of the video signal light by the light diffusing fine particles 16. Therefore, as shown in the second embodiment, when both horizontal and vertical viewing angles are diffused by the vertical cylindrical lens 33 or the horizontal three-dimensional light shielding layer 34, the light diffusibility in the light-transmissive flat plate base material 1 is obtained. It is also possible to exclude the fine particles 16.

FIG. 6 shows a manufacturing process of the horizontal direction light diffusion portion 17 and the vertical direction light diffusion portion 18 of the light transmission type screen 12 according to the second embodiment of the present invention.
First, as a first step, an extrusion molding step is shown in FIG. The extrusion molding is composed of two roll-shaped molds, and in order to form the vertical cylindrical lens 33 in one roll-shaped mold 5, the mold surface has a concave shape 6 with a curved surface.
The substrate of the light-transmitting flat plate substrate 1 such as PMMA or MS resin (polymer of styrene and MMA) is formed by extruding the vertical cylindrical lenses 33 in a parallel arrangement in a stripe shape.
FIG. 6B shows a flat mold forming process as the second process. In the flat mold 7, the flat surface has a concave shape 9 having an isosceles triangle shape in order to form a solid shading layer having an isosceles triangle cross section. By the step (a), the three-dimensional light shielding layer material is formed into an isosceles triangular concave shape 9 with respect to the substrate of the light-transmitting flat plate substrate 1 formed by arranging the vertical cylindrical lenses 33 in parallel in a stripe shape. A horizontal solid-state light-shielding layer 34 whose cross-sectional shape is an isosceles triangle is formed on the surface opposite to the surface on which the vertical cylindrical lens 33 is molded by the filled flat molding, in a direction orthogonal to the arrangement of the vertical cylindrical lenses 33. The light-shielding layer material is molded in parallel with a stripe shape by the adhesion force of the molding process.

  The light transmissive screen according to the present invention has a wide viewing angle, can realize image quality with excellent resolution and contrast at low cost, and is useful for a transmissive screen used in a rear projection television or projector. is there.

The figure which shows typically the structure of the light transmissive screen in Example 1 of this invention. The figure for demonstrating the light-diffusion part of the light transmission type screen in Example 1 of this invention. The figure for demonstrating the manufacturing process of the light transmission type screen in Example 1 of this invention. The figure which shows typically the structure of the light transmissive screen in Example 2 of this invention. The figure for demonstrating the light-diffusion part of the light transmission type screen in Example 2 of this invention. The figure for demonstrating the manufacturing process of the light transmissive screen in Example 2 of this invention. The figure for demonstrating the optical characteristic of the light transmission type screen in Example 1 of this invention Configuration diagram of rear projection TV and projector The figure which shows the structure of the conventional light transmission type screen typically A perspective view showing a first conventional example using two lenticular sheets A perspective view showing a second conventional example using two lenticular sheets

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light-transmitting flat base material 2 Three-dimensional light shielding layer 3 Lenticular lens 4 Light diffusion part 5 Roll-shaped metal mold 6 Curved recessed part 7 Flat type 8 Light-shielding layer 9 Isosceles triangular recessed part 10 Projection engine 11 Mirror 12 Light transmissive type Screen 13 Lens sheet 14 Fresnel lens sheet 15 Projection lens 16 Light diffusing fine particles 17 Horizontal diffusing part 18 Vertical diffusing part 30 Horizontal lenticular sheet 31 Vertical lenticular sheet 32 Horizontal cylindrical lens 33 Vertical cylindrical lens 34 Horizontal three-dimensional shading layer 35 Vertical solid Shading layer

Claims (5)

In a light transmissive screen having a light diffusing portion for condensing and transmitting incident video signal light rays to a light transmissive flat plate base material,
A three-dimensional light shielding layer having an isosceles triangular cross section provided in parallel with the vertical direction as the longitudinal direction on the image signal light incident side of the light transmissive flat plate base material,
On the light-transmitting flat plate base material, it is provided in parallel with the horizontal direction as the longitudinal direction, and a cylindrical lens,
The light transmission type screen, wherein video signal light reflected and diffused in the horizontal direction by the three-dimensional light shielding layer is condensed and diffused in the vertical direction by the cylindrical lens. The cylindrical lens provided in parallel with the horizontal direction as the longitudinal direction,
The light transmissive screen according to claim 1, wherein the light transmissive screen is provided in parallel with a horizontal direction as a longitudinal direction in a light transmissive portion between the three-dimensional light shielding layers provided in parallel. The cylindrical lens provided in parallel with the horizontal direction as the longitudinal direction,
The light transmissive screen according to claim 1, wherein the light transmissive flat plate base material is provided in parallel with the horizontal direction as a longitudinal direction on the image signal light emission side of the light transmissive flat plate base material. A method of manufacturing a light diffusing portion that diffuses light in a horizontal direction and a vertical direction integrally formed with a light-transmitting flat plate base material,
Forming a cylindrical lens in parallel by extrusion on one surface of the light transmissive flat plate base material,
A method of manufacturing a light diffusing portion, comprising: forming a three-dimensional light shielding layer having a cross section of an isosceles triangle in a direction perpendicular to the length direction of the lens on the cylindrical lens by flat molding in a stripe shape. A method of manufacturing a light diffusing portion that diffuses light in a horizontal direction and a vertical direction integrally formed with a light-transmitting flat plate base material,
Forming a cylindrical lens in parallel by extrusion on one surface of the light transmissive flat plate base material,
A light diffusion characterized by forming a three-dimensional light shielding layer having a cross section of an isosceles triangle in a direction perpendicular to the length direction of the cylindrical lens on the other surface of the light transmissive flat plate base material by flat molding in a stripe shape Part manufacturing method.

Images