JP2006162940A - Diffusing lens array sheet, transmissive screen, rear projection display device, and method of manufacturing diffusing lens array sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diffusing lens array sheet which is manufactured at a lower cost and realizes a high resolution and high contrast when constituting a transmissive screen by using the sheet. <P>SOLUTION: The diffusing lens array sheet includes; a lens sheet main body 41 which has a lenticular lens array 42 having ≤0.1mm pitches formed on the incidence side and has a rugged structure 43 formed on the exit side; light shielding parts 46 provided on projecting parts of the rugged structure 43; and a diffusing element 47 provided on almost all the surface of the rugged structure 43 including the light shielding parts 46, along shapes of recessed parts 44 and projecting parts 45. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a diffusing lens array sheet used for a transmission screen of a rear projection display device such as a rear projection television.

  2. Description of the Related Art Conventionally, a rear projection television known as a rear projection display device equipped with a transmissive screen is a transmissive screen that has a substantially rectangular flat plate shape by reflecting video light projected from a projector as a light source by a reflecting mirror. By making the light incident on the rear surface, an observer positioned on the front surface side of the transmissive screen can observe the image light transmitted through the transmissive screen and emitted.

The transmissive screen includes a Fresnel lens sheet that adjusts the direction of incident light to be emitted light, and a lenticular lens array sheet (diffuse lens array sheet) that diffuses the emitted light from the Fresnel lens sheet.
As a lenticular lens array sheet, for example, a lens sheet body made of a thermoplastic resin in which a lenticular lens array (diffuse lens array) is formed on the incident side and a diffusing agent is mixed, and a non-condensing portion by the lenticular lens array are provided. A light-shielding portion provided on the exit side of the lens sheet body so as to shield light, a lens sheet body made of an ultraviolet curable resin and a lenticular lens array (diffuse lens array) formed on the incident side; A light-shielding portion provided on the exit side of the lens sheet main body so as to shield the non-condensing portion by the lenticular lens array, and a diffusion plate provided on substantially the entire exit side of the lens sheet main body including the light-shielding portion. Is known.

Here, as an example of the former method for producing a diffusing lens array sheet, for example, a method using an extrusion method is known (see Patent Document 1).
According to such a manufacturing method, first, a diffusing lens array is formed on the incident side by extruding a molten thermoplastic resin mixed with a diffusing agent and passing it between mold rolls having a lens shape. The lens sheet body can be obtained by an extrusion method. And the said diffused lens array sheet | seat can be manufactured by providing the light-shielding part which shields the non-condensing part of a diffused lens array in the output side of a lens sheet main body.

Further, as an example of the latter method for producing a diffuse lens array sheet, for example, a method using an ultraviolet curing method is known.
According to such a manufacturing method, first, a lens in which a diffused lens array is formed on the incident side by pouring molten ultraviolet curable resin into a lens-shaped mold and irradiating and curing the ultraviolet rays. The sheet body can be obtained by an ultraviolet curing method. Then, for example, a light shielding part that shields the non-condensing part of the diffusing lens array using a photosensitive material is provided on the exit side of the lens sheet body, and the diffusion plate is provided on substantially the entire exit side of the lens sheet body including the light shielding part. By providing the above, it is possible to manufacture the diffusing lens array sheet.
JP 56-164332 A

However, in the manufacturing method of the diffusing lens array sheet using the above extrusion method, although the manufacturing cost can be reduced, the moldability of the lens sheet main body mixed with the diffusing agent is poor, so that the fine pitch in recent years has been reduced. There is a problem in that the diffusion lens array that can sufficiently meet the requirements (for example, 1.0 mm or less, preferably 0.2 mm or less) cannot be formed on the lens sheet body, resulting in low resolution. . In addition, since the diffusion agent is mixed in the lens sheet body and the area of the condensing part by the diffusing lens array becomes large, it is necessary to set the area of the light shielding part small so as not to reduce the light transmittance. There is also a problem that the contrast becomes low.
On the other hand, in the method of manufacturing a diffusing lens array sheet using the ultraviolet curing method, although high resolution and high contrast can be realized, there is a problem that the manufacturing cost becomes very high.

  The present invention has been made in view of the above problems, and provides a diffusing lens array sheet that can reduce the manufacturing cost and can realize high resolution and high contrast when a transmissive screen is configured. The purpose is to do.

  In order to solve the above problems and achieve such an object, the diffusing lens array sheet according to the present invention has a diffusing lens array having a pitch of 1.0 mm or less on the incident side and irregularities on the emitting side. A lens sheet body having a structure; a light shielding portion provided in a concave portion or a convex portion in the concave-convex structure; and a substantially entire surface of the concave-convex structure including the light shielding portion along the shape of the concave portion and the convex portion. And a diffusion element.

  In addition, the manufacturing method of the diffusing lens array sheet according to the present invention includes a lens sheet body in which a diffusing lens array having a pitch of 1.0 mm or less is formed on the incident side and a concavo-convex structure is formed on the exit side, and the concavo-convex structure Manufacturing a diffusing lens array sheet comprising: a light-shielding portion provided on a convex portion of the light-receiving portion; and a diffusion element provided on substantially the entire surface of the concave-convex structure including the light-shielding portion along the shape of the concave portion and the convex portion. For forming a diffusing lens array having a pitch of 1.0 mm or less on the incident side of the lens sheet main body and forming a concavo-convex structure on the exit side, and a light shielding material on the convex portion in the concavo-convex structure A step of transferring and forming a light-shielding portion; and a step of providing a diffusing element on substantially the entire surface of the concave-convex structure including the light-shielding portion along the shape of the concave and convex portions of the concave-convex structure; It is characterized in that it comprises.

  In addition, the manufacturing method of the diffusing lens array sheet according to the present invention includes a lens sheet main body in which a diffusing lens array having a pitch of 1.0 mm or less is formed on the incident side and a concavo-convex structure is formed on the exit side, and the concavo-convex structure In order to manufacture a diffusing lens array sheet, comprising: a light-shielding portion provided in a concave portion and a diffusing element provided on substantially the entire surface of the concavo-convex structure including the light-shielding portion along the shape of the concave and convex portions And forming a diffusing lens array having a pitch of 1.0 mm or less on the incident side of the lens sheet main body and forming a concavo-convex structure on the exit side, and filling a light shielding material in the concave portion in the concavo-convex structure A step of forming a light shielding portion, and a step of providing a diffusing element on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of the concave and convex portions of the concavo-convex structure. It is characterized by that example.

According to the diffusing lens array sheet of the present invention, first, since the diffusing agent is not mixed in the lens sheet body, even when an extrusion method capable of reducing the manufacturing cost is used, 1.0 mm or less. A high-resolution image can be realized by reliably forming a diffusing lens array having a fine pitch of 5 mm on the incident side of the lens sheet main body. In addition, since the diffusing agent is not mixed in the lens sheet main body and the diffusing element is provided on the emission side from the light shielding part provided in the lens sheet main body, the light shielding part without reducing the light transmittance. The area can be increased to achieve high contrast.
And in this invention, since the light-shielding part is provided in the recessed part or convex part of the concavo-convex structure using the concavo-convex structure formed in the exit side of the lens sheet body, a conventional photosensitive material is used. Compared with the case where the light shielding portion is provided on the substantially flat surface, the light resistance is excellent and the manufacturing cost is further reduced. Further, since the diffusing element is provided on the exit side of the lens sheet body along the shape of the concave and convex portions of the concavo-convex structure over substantially the entire surface of the concavo-convex structure including the light shielding portion, the diffusing element is the lens. It can be set as the state closely_contact | adhered with respect to the uneven structure of a sheet | seat main body without a gap. Therefore, when the lens sheet body is formed by an extrusion method for cost reduction, even if the shape accuracy of the concavo-convex structure is poor, as long as the positions of the concave and convex portions are accurate, as a diffusing lens array sheet The optical characteristics of are difficult to deteriorate. Furthermore, since this diffusing element is not provided only in the region other than the light shielding portion in the concavo-convex structure, but provided over substantially the entire surface including the light shielding portion in the concavo-convex structure, a wide viewing angle can be ensured. In addition to being able to do so, the light shielding part can also be protected by a diffusing element.

In the present invention, the lens sheet body is preferably made of a thermoplastic resin.
With such a configuration, it is possible to reliably form a lens sheet body made of a thermoplastic resin by an extrusion method, thereby reducing the manufacturing cost and obtaining a high resolution.

In the present invention, the lens sheet body is preferably made of a transparent material.
With such a configuration, it is possible to reduce the area of the condensing part by the diffusing lens array, increase the area of the light-shielding part as much as possible, and ensure high contrast.

Moreover, in this invention, it is preferable that the difference of the height of the recessed part and convex part of the said uneven structure is set to 0.01 mm-0.5 mm.
With such a configuration, it is possible to easily form the concavo-convex structure, and it is possible to reliably provide a light-shielding portion with respect to the concave portion or the convex portion in the concavo-convex structure.

In the present invention, it is preferable that the light emitting side of the diffusing element has a substantially flat surface.
With such a configuration, when light is emitted from the diffusing element, the light is not easily disturbed and image quality deterioration can be suppressed.

  In the present invention, the diffusing element may be made of a material having diffusibility and cured by post-processing, or may be made of an adhesive material having diffusibility.

In the present invention, the thickness P of the lens sheet main body is set to 0.5 mm or more, and the relationship between the thickness P of the lens sheet main body and the thickness D of the diffusing element satisfies P> D × 3. You may make it satisfy | fill.
With such a configuration, the thickness of the lens sheet main body is set to be sufficiently large and the lens sheet main body has sufficient rigidity. Therefore, it is possible to reduce the thickness of the diffusing element, thereby reducing the manufacturing cost. The resolution can be improved by lowering the resolution. In particular, when the thickness of the diffusing element satisfies the above formula, the rigidity of the lens sheet main body overcomes the environmental change factors of the diffusing element, so that warpage is less likely to occur and weather resistance can be improved.

  In the present invention, the diffusing lens array may be a lenticular lens array or a microlens array.

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the rear projection television 10 as a rear projection display device according to the first embodiment exposes the casing 11 and the front side (right side in FIG. 1) to the outside of the casing 11. A transmissive screen 20 having a substantially rectangular flat plate shape with the back side (left side in FIG. 1) exposed to the inside of the housing 11, and image light with respect to the back surface of the transmissive screen 20 disposed in the housing 11. And a projector 12 as a light source for projecting light, and, for example, two reflecting mirrors 13 and 14 that are arranged in the housing 11 and deflect the optical path of the image light projected from the projector 12.

As shown in FIG. 2, the transmission screen 20 includes a Fresnel lens sheet 30 and a lenticular lens array sheet (diffuse lens array sheet) 40. The Fresnel lens sheet 30 has a Fresnel lens 31 that adjusts the direction of incident light and uses it as outgoing light. The lenticular lens array sheet 40 has a lenticular lens array (diffusion lens array) 42 that diffuses the light emitted from the Fresnel lens sheet 30 in the left-right direction (horizontal direction) of the screen, and the light emitted from the lenticular lens array 42 on the screen. And a diffusion element 47 that diffuses in the vertical direction (vertical direction).
The Fresnel lens sheet 30 and the lenticular lens array sheet 40 are sequentially arranged from the back side (incident side, left side in FIG. 2) to the front side (outgoing side, right side in FIG. 2) of the transmissive screen 20. Are arranged so as to be substantially parallel to each other.

  As shown in FIG. 2, the Fresnel lens sheet 30 has a Fresnel lens surface 32 on one side facing the lenticular lens array sheet 40 side (one side facing the front side of the transmissive screen 20). A lens 31 is provided.

  The Fresnel lens 31 is formed by concentrically arranging a plurality of unit lenses. In the first embodiment, the direction along the normal of the lens substrate 32 passes through the center of the concentric circle formed by the plurality of unit lenses. That is, the optical axis P1 of the Fresnel lens sheet 30 is longer than the long side of the lens substrate 32 in the direction along the short side of the lens substrate 32 passing through the center P2 of the lens substrate 32 (the vertical direction of the screen) as shown in FIG. Are also arranged so as to pass through positions outside the lens substrate 32 on the outside.

The Fresnel lens sheet 30 configured as described above is provided on the transmissive screen 20 so that its optical axis P1 is positioned on the lower side, for example.
Then, when the image light projected from the projector 12 is incident on the back surface of the transmissive screen 20, that is, when the image light projected from the projector 12 is incident on the Fresnel lens sheet 30 located on the back surface side of the transmissive screen 20. The Fresnel lens sheet 30 adjusts the direction of the incident image light so as to be substantially parallel light, and then emits the light toward the lenticular lens array sheet 40.

Here, considering the state in which the optical path of the image light projected from the projector 12 is not deflected by the reflecting mirrors 13 and 14, the projector 12 is disposed on the optical axis P1 of the Fresnel lens 30, so that FIG. As indicated by a two-dot chain line in the middle, the state is arranged in a region deviated downward, for example, from a region facing the rear surface of the transmission screen 20.
Then, the optical path of the image light projected from the projector 12 having such an arrangement is disposed so as to face the back surface of the transmissive screen 20 and to be substantially parallel to the transmissive screen 20. By deflecting by the mirror 14 and another reflecting mirror 13, the projector 12 is disposed in the housing 11 in a region deviated from the region between the transmissive screen 20 and the reflecting mirror 14, for example, downward. ing.

2 and 3, the lenticular lens array sheet 40 has a substantially rectangular flat plate shape and includes a lens sheet body 41 made of a thermoplastic resin that is a transparent material.
This lens sheet main body 41 has a lenticular lens array (diffuse lens array) 42 formed on one side of the incident side facing the Fresnel lens 30 side (one side facing the back side of the transmissive screen 20), and one side of the exit side. An uneven structure 43 is formed on one side facing the front side of the transmissive screen 20.

  The lenticular lens array 42 is formed by arranging a plurality of cylindrical lenses (unit lenses) having a substantially semi-cylindrical shape so as to be substantially parallel to each other, and the length direction of these cylindrical lenses is set in the vertical direction of the screen (vertical). Direction). In FIG. 2 and FIG. 3, the length direction of the cylindrical lens is shown to be substantially coincident with the horizontal direction (horizontal direction) instead of the vertical direction (vertical direction) of the screen for easy understanding.

  When the image light emitted from the Fresnel lens sheet 30 is incident on the lenticular lens array sheet 40, the lenticular lens array 42 collects and diffuses the incident image light in the left-right direction (horizontal direction) of the screen to form striped light. Then, the light is emitted toward a diffusion element 47 described later.

  The concavo-convex structure 43 is formed by alternately arranging a plurality of concave portions 44 and a plurality of convex portions 45. In the first embodiment, the concave portions 44 are located in the light condensing portion by the lenticular lens array 42, and the lenticular structure is formed. A convex portion 45 is located at a non-light condensing portion by the lens array 42.

  Here, in the lenticular lens array 42 formed on the incident side of the lens sheet main body 41, the arrangement pitch of the cylindrical lenses (unit lenses) is set to 1.0 mm or less (preferably 0.2 mm or less). In the concavo-convex structure 43 formed on the emission side of 41, the difference in height between the concave portion 44 and the convex portion 45 (height of the convex portion 45 with respect to the concave portion 44) H is set to 0.01 mm to 0.5 mm. .

In addition, the lenticular lens array sheet 40 includes a light shielding portion 46 provided on the top surface of the convex portion 45 in the concavo-convex structure 43.
Therefore, the light shielding part 46 is a black stripe (BS) provided so as to shield the stripe-shaped non-light-condensing part by the lenticular lens array 42.

Furthermore, the lenticular lens array sheet 40 includes a diffusing element 47 provided over substantially the entire surface of the concavo-convex structure 43 including the light shielding portion 46 along the shape of the concave portion 44 and the convex portion 45 in the concavo-convex structure 43.
The diffusing element 47 has a concave surface 44 and a single surface on the incident side facing the lens sheet main body 41 side (one surface facing the back side of the transmissive screen 20) in close contact with the concavo-convex structure 43 including the light shielding portion 46. While the concave and convex surface reflecting the shape of the convex portion 45 is used, one side on the emission side (one side facing the front side of the transmission screen 20) is a substantially flat surface.

  In the first embodiment, the diffusing element 47 is made of a material cured by post-treatment such as heat treatment or active energy ray irradiation treatment, and has light diffusibility when mixed with a diffusing agent. . Instead, the diffusing element 47 is made of, for example, a pressure-sensitive adhesive material or adhesive material mixed with a diffusing agent, and a resin or glass plate for reinforcing the strength is used for the concavo-convex structure 43. It may be used when adhering to.

  In the first embodiment, the diffusing element 47 is shown as being mixed with a diffusing agent throughout, but is not limited thereto. For example, the concavo-convex structure in the diffusing element 47 A part on the 43 side may be made of a transparent material in which no diffusing material is mixed.

  Further, in the lenticular lens array sheet 40 having such a configuration, the thickness P of the lens sheet main body 41 (the thickness P from the top of the cylindrical lens in the lenticular lens array 42 to the top surface of the projection 45 in the concavo-convex structure 43). , 0.5 mm or more, and the thickness P of the lens sheet body 41 and the thickness D of the diffusing element 47 (thickness D from the top surface of the convex portion 45 in the concavo-convex structure 43 to one surface on the exit side of the diffusing element 47) The relationship of P> D × 3 is satisfied.

The image light condensed and diffused in the left-right direction (horizontal direction) of the screen by the lenticular lens array 42 passes through the concave portion 44 of the concave-convex structure 43 formed on the exit side of the lens sheet body 41 and enters the diffusing element 47. The light is diffused in the vertical direction (vertical direction) of the screen by the diffusing element 47 and then emitted toward the front surface side of the transmissive screen 20.
Here, it is desirable that the diffusing element 47 has little reflection scattering and strong transmission scattering. Specifically, it is desirable that the reflectance of the diffusing element 47 is set to 1% or less.

Hereinafter, an example of the manufacturing method of the diffusing lens array sheet 40 according to the first embodiment as described above will be described.
First, by using an extrusion method, a thermoplastic resin, which is a molten transparent material, is extruded and passed between a pair of mold rolls, so that it is 1.0 mm or less (preferably 0.2 mm or less) on one side on the incident side. A lens sheet body 41 is obtained in which a lenticular lens array 42 having a pitch of) is formed and a concavo-convex structure 43 is formed on one surface on the emission side.

Next, the light shielding material is transferred to the convex portion 45 in the concave-convex structure 43 formed on one side of the exit side of the lens sheet main body 41 to provide the light shielding portion 46.
The step of transferring the light shielding material to the convex portion 45 is performed using the shape of the concave-convex structure 43. Specifically, a method of transferring ink containing a black pigment to only the convex portion 45 by a transfer roller, and a method of transferring a transfer foil containing a black pigment to only the convex portion 45 can be exemplified.

Then, the light-shielding portion 46 is provided only on the convex portion 45, and a material mixed with a diffusing material is applied to the concavo-convex structure 43 and then cured by post-processing, or a resin or glass plate is mixed with a diffusing agent. By adhering with an adhesive material or an adhesive material, the diffusing element 47 can be provided over substantially the entire surface of the concavo-convex structure 43 including the light shielding portion 46 along the shape of the concave portion 44 and the convex portion 45 in the concavo-convex structure 43. .
Through such steps, the lenticular lens array sheet 40 according to the first embodiment can be manufactured.

In the lenticular lens array sheet 40 according to the first embodiment configured as described above, first, a diffusing agent is not mixed in the lens sheet body 41 made of a thermoplastic resin, so that the manufacturing cost can be reduced. Even if a simple extrusion method is used, the lenticular lens array 42 having a fine pitch of 1.0 mm or less (preferably 0.2 mm or less) is reliably formed on the incident side of the lens sheet main body 41 to realize high resolution. Can do.
The pitch of the lenticular lens array 42 is preferably as small as possible in order to obtain a high resolution. However, considering the technical limit at the present time, it is set to 0.05 mm or more, for example.

  Further, the lens sheet main body 41 is made of a transparent material in which no diffusing agent is mixed, and the diffusing element 47 is provided on the emission side from the light shielding portion 46 provided on the lens sheet main body 41. High contrast can be realized by increasing the area of the light-shielding portion 46 without reducing the transmittance.

  And in this 1st Embodiment, since the light-shielding part 46 was provided in the convex part 45 of the uneven structure 43 using the uneven structure 43 formed in the output side of the lens sheet main body 41, it is conventional. Compared with the case where a light shielding part is provided on a substantially flat surface using such a photosensitive material, the light resistance is excellent and the manufacturing cost is further reduced.

Further, a diffusion element 47 is provided on the exit side of the lens sheet main body 41 along the shape of the concave portion 44 and the convex portion 45 of the concave-convex structure 43 over substantially the entire concave-convex structure 43 including the light-shielding portion 46. Therefore, the diffusing element 47 can be brought into close contact with the concavo-convex structure 43 of the lens sheet main body 41 without a gap.
Therefore, even if the lens sheet body 41 is formed by an extrusion method to reduce the cost and the shape accuracy of the concavo-convex structure 43 deteriorates, as long as the positions of the concave portion 44 and the convex portion 45 are accurate, the lenticular lens array The optical characteristics of the sheet 40 are difficult to deteriorate.

  Further, the diffusion element 47 is not provided only in the region other than the light shielding portion 46 in the concavo-convex structure 43, but is provided over substantially the entire surface including the light shielding portion 46 in the concavo-convex structure 43. In addition to ensuring a wide area, the light shielding part 46 can be protected by the diffusing element 47.

  Moreover, since the height difference H between the concave portion 44 and the convex portion 45 in the concave-convex structure 43 of the lens sheet body 41 is set to 0.01 mm to 0.5 mm, the concave-convex structure 43 can be easily formed. In addition, the light-shielding portion 46 can be reliably provided to the convex portion 45 in the concavo-convex structure 43.

  In addition, since one surface on the emission side of the diffusing element 47 is a substantially flat surface, when image light is emitted from the diffusing element 47, the light is less likely to be disturbed to suppress deterioration in image quality. Can do.

Furthermore, since the thickness P of the lens sheet main body 41 is set to 0.5 mm or more and the lens sheet main body 41 has sufficient rigidity, the thickness D of the diffusing element 47 can be reduced, and the manufacturing can be performed. The cost can be further reduced and the resolution can be improved.
Moreover, since the thickness D of the diffusing element 47 is set so as to satisfy P> D × 3 in relation to the thickness P of the lens sheet main body 41, the rigidity of the lens sheet main body 41 changes the environment of the diffusing element 47. Overcoming the factors makes it difficult for warp to occur, and weather resistance can be improved.

Next, a second embodiment of the present invention will be described. The same parts as those of the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.
In the lenticular lens array sheet 40 according to the second embodiment, as shown in FIG. 4, the convex portion 45 is located at the light collecting portion by the lenticular lens array 42, and the concave portion 44 is located at the non-light collecting portion by the lenticular lens array 42. The lenticular lens array sheet 40 includes a light shielding portion 46 provided on the bottom surface of the concave portion 44 in the concave-convex structure 43.

Hereinafter, an example of the manufacturing method of the diffusing lens array sheet 40 according to the second embodiment as described above will be described.
First, by using an extrusion method, a thermoplastic resin, which is a molten transparent material, is extruded and passed between a pair of mold rolls, so that it is 1.0 mm or less (preferably 0.2 mm or less) on one side on the incident side. A lens sheet body 41 is obtained in which a lenticular lens array 42 having a pitch of) is formed and a concavo-convex structure 43 is formed on one surface on the emission side.

Next, a light shielding material 46 is filled in the concave portion 44 in the concave-convex structure 43 formed on one side of the exit side of the lens sheet main body 41 to provide a light shielding portion 46.
The step of filling the light shielding material in the recess 44 is performed using the shape of the concavo-convex structure 43. Specifically, a method of applying an ink containing a black pigment over the entire surface of the concavo-convex structure 43, removing only the ink attached to the convex portion 45 with a squeegee or the like, and then curing the ink remaining in the concave portion 44. Can be mentioned. Of course, ink may be applied only to the concave portion 44 of the concave-convex structure 43 and cured.

Then, the uneven structure 43 in which the light shielding portion 46 is provided only in the concave portion 44 is applied by applying a material mixed with a diffusing material and then cured by post-processing, or a resin or glass plate is mixed with a diffusing agent. The diffusion element 47 can be provided over substantially the entire surface of the concavo-convex structure 43 including the light shielding portion 46 along the shape of the concave portion 44 and the convex portion 45 in the concavo-convex structure 43 by bonding with a material or an adhesive material.
Through such steps, the lenticular lens array sheet 40 according to the second embodiment can be manufactured.

  The lenticular lens array sheet 40 according to the second embodiment configured as described above can basically obtain the same effects as those of the first embodiment described above, but the second embodiment is more advantageous. Since the light shielding part 46 can be formed thicker than that of the first embodiment, the light shielding effect of the light shielding part 46 can be increased.

In each of the above-described embodiments, the lenticular lens array sheet 40 as an example of the diffusing lens array sheet has been described. However, the present invention is not limited to this.
For example, the diffusion lens array sheet according to the present embodiment may be a microlens array sheet in which a lens array in which a plurality of unit lenses are arranged in a matrix is formed on one surface on the incident side of the diffusion lens array. . Further, for example, the diffuser lens array sheet according to the present embodiment includes a first lens array and a plurality of cylindrical lenses (unit lenses) in which a plurality of cylindrical lenses (unit lenses) are arranged substantially in parallel on one surface on the incident side of the diffuser lens array. A cross wrench lens sheet provided with a lens array in which the second lens array in which the unit lenses are arranged substantially in parallel with each other is arranged on the same plane so that the length directions of the cylindrical lenses intersect each other. There may be. Further, for example, the diffusion lens array sheet according to the present embodiment is a prism lens array sheet in which a lens array in which a plurality of unit lenses for reflecting and diffusing video light is arranged on the incident side of the diffusion lens array is formed. There may be.

It is a schematic sectional drawing which shows an example of the rear projection television by 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the transmissive screen by 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the diffusion lens sheet by 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the diffusion lens sheet by 2nd Embodiment of this invention.

Explanation of symbols

10 Rear projection television (rear projection type display device)
12 Projector (light source)
20 transmissive screen 30 Fresnel lens sheet 40 lenticular lens sheet (diffuse lens sheet)
41 Lens sheet body 42 Lenticular lens array (diffuse lens array)
43 Concave and convex structure 44 Concave portion 45 Convex portion 46 Light shielding portion 47 Diffusing element

Claims (14)

A lens sheet body in which a diffusing lens array having a pitch of 1.0 mm or less is formed on the incident side and a concavo-convex structure is formed on the output side;
A light-shielding portion provided in a concave portion or a convex portion in the concave-convex structure;
A diffusion element provided on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of the concave portion and the convex portion;
A diffusing lens array sheet comprising: In the diffusing lens array sheet according to claim 1,
The diffuser lens array sheet, wherein the lens sheet body is made of a thermoplastic resin. In the diffusing lens array sheet according to claim 1 or 2,
The lens sheet main body is made of a transparent material. In the diffusing lens array sheet according to any one of claims 1 to 3,
The diffusion lens array sheet, wherein the height difference between the concave and convex portions of the concavo-convex structure is set to 0.01 mm to 0.5 mm. In the diffusing lens array sheet according to any one of claims 1 to 4,
The diffusion element array sheet according to claim 1, wherein the diffusing element has a substantially flat surface on the emission side. In the diffusing lens array sheet according to any one of claims 1 to 5,
The diffusion lens array sheet, wherein the diffusion element is made of a material having a diffusibility and cured by post-processing. In the diffusing lens array sheet according to any one of claims 1 to 5,
The diffusion lens array sheet, wherein the diffusion element is made of a diffusive adhesive material. In the diffusing lens array sheet according to any one of claims 1 to 7,
The thickness P of the lens sheet main body is set to 0.5 mm or more, and the relationship between the thickness P of the lens sheet main body and the thickness D of the diffusing element satisfies P> D × 3. Diffuse lens array sheet. In the diffusing lens array sheet according to any one of claims 1 to 8,
The diffusion lens array sheet is characterized in that the diffusion lens array is a lenticular lens array. In the diffusing lens array sheet according to any one of claims 1 to 8,
The diffusion lens array sheet is a microlens array.   A transmissive screen comprising the diffusing lens array sheet according to claim 1. The transmission screen according to claim 11,
A light source that projects image light on the back of the transmissive screen;
A rear projection display device comprising: A lens sheet body having a diffusing lens array having a pitch of 1.0 mm or less formed on the incident side and a concavo-convex structure formed on the output side, a light shielding portion provided on a convex portion in the concavo-convex structure, the concave portion, A diffusion element array sheet provided with a diffusing element provided on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of a convex portion,
Forming a diffusing lens array having a pitch of 1.0 mm or less on the incident side of the lens sheet body and forming an uneven structure on the exit side;
A step of transferring a light shielding material to a convex portion in the concavo-convex structure to form a light shielding portion;
Providing a diffusing element on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of the concave and convex portions of the concavo-convex structure;
The manufacturing method of the diffuser lens array sheet | seat characterized by the above-mentioned. A lens sheet body having a diffusing lens array having a pitch of 1.0 mm or less on the incident side and a concavo-convex structure formed on the exit side, a light shielding portion provided in a concave portion in the concavo-convex structure, the concave portion and the convex A diffusion lens array sheet provided with a diffusion element provided on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of the portion,
Forming a diffusing lens array having a pitch of 1.0 mm or less on the incident side of the lens sheet body and forming an uneven structure on the exit side;
A step of burying a light shielding material in the concave portion in the concave-convex structure to form a light shielding portion;
Providing a diffusing element on substantially the entire surface of the concavo-convex structure including the light shielding portion along the shape of the concave and convex portions of the concavo-convex structure;
The manufacturing method of the diffuser lens array sheet | seat characterized by the above-mentioned.

Images