JPH06222463A - Lenticular lens sheet and its production - Google Patents

Abstract

PURPOSE:To eliminate the uneven thicknesses, pinholes, etc., of a light absorption layer and to prevent the degradation in transmittance of light condensing parts by forming non-light condensing parts of a resin contg. a black coloring agent. CONSTITUTION:Lenticular lenses 11 are formed on one surface (incident surface) of a light-transparent resin sheet 10 which is a base material. The lenticular lenses 12 are also formed on the other surface (exit surface) in the positions facing the lenticular lenses 11 and further, the light absorption layers (black stripes) 14 are formed in the non-light condensing parts 13 of the lenticular lenses 11. The black stripes are formed into an approximately square shape in section and the projecting parts are, therefore, eventually formed. The reduction in the width of the black stripes is suppressed and a good contrast is obtd. even when the lens sheet is monitored from the diagonal direction of the exit surface. The black stripes are formed out of the resin contg. the black coloring agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lenticular lens sheet used as a transmissive screen for a projection television or the like, in which a black stripe having a good contrast is formed, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a transmissive screen for a projection television or the like, a lenticular lens sheet having a black stripe with a good contrast is known. For example, as shown in FIG. 5, a lenticular lens 61 is formed on one surface (incident surface), and a lenticular lens 62 is formed on the other surface (emission surface) at a position facing the lenticular lens 61. Further, a convex portion 63 is formed on the non-light-condensing portion of the lenticular lens 61, and a light absorbing layer (black stripe) is formed on the flat surface 64 of the convex portion 63 as shown in FIG. 6A. . With this light absorption layer, contrast can be obtained when viewed from the emission side.

Such a light absorbing layer has been formed by applying black ink, printing or transferring a transfer paper. Since the light absorption layer by these methods is formed only on the flat surface of the convex portion formed in the non-light-condensing portion, there is a problem that the contrast is lowered when observed from an oblique direction of the screen. On the other hand, in order to solve this problem, as shown in FIG. 6B, there is one in which the light absorption layer is provided not only on the flat surface 64 but also on the sloped surface 65. As a forming method, a portion (light collecting portion) where the convex portion 63 is optically removed is masked by using a photosensitive resin, black ink is applied, printing is performed on the entire surface, and then the mask is peeled off. Or a doctor coat method is used to form a releasable ink layer on the light-collecting portion to form a mask, apply black ink over the entire surface, and form by printing or the like, and then remove the mask to remove the flat surface 64 and the sloped surface 65. A method of forming a light absorption layer has been proposed.

[0004]

However, coating,
In the case of printing, since black ink is used, there is a risk that the ink will also adhere to the light condensing part and reduce the transmittance. Moreover, there are quality problems due to uneven thickness of the black ink, pinholes, etc. It is complicated because it requires the process of
There were problems such as high cost. Therefore, an object of the present invention is to provide a lenticular lens sheet having a high quality light absorbing layer and a method for manufacturing the same.

[0005]

The invention according to claim 1 is
A first lenticular lens is provided on one surface of the translucent resin sheet, a second lenticular lens is provided on the other surface at a position corresponding to the first lenticular lens, and a non-collection of the first lenticular lens. A lenticular lens sheet having a light absorbing layer provided in a light portion, wherein the non-light-collecting portion is formed of a resin containing a black colorant.

According to a second aspect of the invention, the first lenticular lens is provided on one surface of the translucent resin sheet, and the second lenticular lens is provided on the other surface at a position corresponding to the first lenticular lens. A lens and the first
In the method for producing a lenticular lens sheet in which a light absorption layer is provided in the non-light-condensing part of the lenticular lens, a softened thermoplastic resin containing a black colorant is formed on the surface of the softened transparent resin sheet. It is characterized in that it is supplied in a striped shape and is shaped by a first mold having a first lenticular lens shape, a second lenticular lens and a second mold having a non-light-condensing portion having a desired shape. .

[0007]

According to the invention of claim 1, since the non-light-collecting portion is formed of the resin containing the black colorant, the light-absorbing layer is formed together with the non-light-collecting portion. There is no unevenness in the thickness of the light absorption layer, pinholes, etc.

According to the second aspect of the invention, the softened thermoplastic resin containing the black colorant is supplied in stripes on the surface of the translucent resin sheet in the softened state to form the first lenticular lens. Since the shaping is performed by the first die having the shape and the second lenticular lens and the second die having the non-light-collecting portion having the desired shape, the application of the black ink,
The light absorption layer can be formed at the same time when the lens shape is shaped without printing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1 is a perspective view showing the configuration of an embodiment of the present invention, FIG.
FIG. 3 is a sectional view of the same embodiment. As shown in the figure, the lenticular lens 11 is formed on one surface (incident surface) of the translucent resin sheet 10 serving as a base material, and the lenticular lens 11 is formed on the other surface (emission surface) at a position facing the lenticular lens 11. 12, and a light absorbing layer (black stripe) 14 is formed on the non-light-collecting portion 13 of the lenticular lens 11. Since this black stripe has a substantially rectangular cross section as shown in FIG. 2, it forms a convex portion, and the width reduction of the black stripe is suppressed even when it is monitored from an oblique direction of the emission surface, which is good. It is possible to obtain a high contrast.

Here, the black stripes are formed of a resin containing a black colorant. For example,
Black dye such as aniline black, carbon black,
A resin in which a black pigment such as acetylene black, lamp black, bone black, graphite (Fe ₃ O ₄ ) or mineral black is kneaded, and is adhered to a transparent resin sheet 10 as a base material by a method such as heat lamination. Any resin can be used. For example, acrylic resin, vinyl chloride resin, acrylic-styrene copolymer resin.

Next, the manufacturing method of the present invention will be described. FIG. 3 is a schematic view showing an embodiment of a manufacturing apparatus according to the manufacturing method of the present invention, and FIG. 4 is a view showing each mold roll of the same embodiment. In FIG. 3, 1 is a first extruder and 2 is a second extruder.
Extruder 3 of FIG. 4 is connected to the second extruder 2 of FIG.
A filling machine including the first die roll 4 for the exit surface having the shape shown in (a), 5 is a die roll for the entrance surface having the shape shown in FIG. 4 (b), and 6 is shown in FIG. 4 (c). The second die roll for the shaped emission surface, and 7 is a shaping roll.

The first die roll 4 for the emitting surface is shown in FIG.
As shown in (a), the concave portion 4 having a predetermined width and depth.
1 and the convex portions 42 are formed at a predetermined pitch. As shown in FIG. 4 (b), in the die roll 5 for the incident surface, curved surface shaped recesses 51 are formed at a predetermined pitch so as to correspond to the pitch of the recesses 41 of the first die roll 4 for the exit surface. ing. As shown in FIG. 4C, the second die roll 6 for the emission surface has a pitch of the recesses 61 and the protrusions 42 corresponding to the pitch of the recesses 41 of the first die roll 4 for the emission surface. Corresponding to, a concave convex portion 62 is formed in the center direction of the mold roll 6 with a predetermined curved surface shape. The pitches and shapes of the concave portions 41, 51, 61 and the convex portions 42, 62 of each mold roll are determined in consideration of the optical characteristics of the lenticular lens sheet to be molded and the molding characteristics of resin. The shaping roll 7 is a mirror-finished roll plated with chrome or the like. The mold rolls 4 and 6 and the shaping roll 7 are installed at positions close to the mold roll 5 with a predetermined gap. Further, the filling machine 3 contains the first die roll 4 for the emission surface, and the inner packaging surface 32 has the convex portion 4 of the die roll 4.
2 is in close contact with the mold roll 4 so that the mold roll 4 can rotate. Further, a cutout portion 31 having a predetermined volume is provided in the filling portion of the first die roll 4 for the emission surface. Furthermore, each mold roll 4, 5, 6, shaping roll 7, filling machine 3
Can be set to any temperature according to the melting temperature of the molding resin.

Next, the manufacturing process will be described. First,
The translucent resin 9 in a molten state, which is the material of the lenticular lens sheet, is molded from the first extruder 1 into a sheet shape between the mold rolls 4 and 5 which are heated and are rotating in a predetermined direction (arrow). While extruding. At the same time, the thermoplastic resin 2 in a molten state, which can be heat-laminated with the translucent resin 9 from the second extruder 2 and is kneaded with a black dye, a black pigment or the like.
1 is extruded and supplied to the notch 31 of the filling machine 3. here,
Since the mold roll 4 is rotating and the protrusion 42 is in close contact with the inner surface 32 of the filling machine 3, the molten resin supplied to the notch 31 is sequentially filled in the recess 41 of the mold roll 4. At the same time, excess resin is cut off like a blade at the tip of the notch 31.

The resin sheet is applied to the mold roll 4,
The molten resin filled in the recess 41 by sliding contact between the five is supplied onto the resin sheet. At this time, the supplied molten resin is supplied in stripes as the mold roll 3 rotates and the resin sheet moves. Further, the supplied striped resin is transferred and fixed while being thermally laminated to the resin sheet, and further, since a black dye, a black pigment and the like are kneaded,
A black stripe will be formed on the resin sheet. The resin sheet with the black stripe is
When passing between the mold rolls 5 and 6, it is shaped into a final shape between these molds and is shaped by a shaping roll 7 to obtain a desired lenticular lens sheet.

In the above-described manufacturing apparatus, the desired lens shape as shown in FIG. 1 or FIG. 2 is obtained in advance by the entrance surface die roll 5 and the emission surface second die roll 6. As described above, the concave portion 51 of the die roll 5 for the incident surface is
And the concave convex portion 62 of the second die roll 6 for the emission surface face each other, and the concave portion 61 of the second die roll 6 for the emission surface and the concave portion 41 of the first die roll 4 for the emission surface face each other. They are aligned so that they are in the same position. That is, in the lenticular lens sheet, the entrance surface is shaped by the entrance surface mold roll 5, and the black stripe formed by the exit surface first mold roll 4 is formed into the exit surface second mold roll 6.
The light emitting surface is shaped into a desired lens shape by being molded by the concave portion of the second mold roll 6 for the light emitting surface and simultaneously by the concave convex portion 62 of the second metal mold roll 6 for the light emitting surface.

[Example] An acrylic resin (Spec-B, MHOG: manufactured by Sumitomo Chemical Co., Ltd.), which is a translucent resin, in which 2.5% by weight of silica, which is a light diffusing agent, was kneaded was used with a die temperature of 230 from the first extruder. A sheet having a thickness of 1.5 mm was formed under the condition of ° C, and then an acrylic resin (same as above) in which 1.5% by weight of carbon black was kneaded as a black dye from a second extruder was used at a die temperature of 230 ° C. Extruded under the conditions, 1st
On the sheet in the melted and softened state molded by the extruder of
The black acrylic resin in a molten state extruded from the second extruder is supplied in a stripe shape by the first die roll for emitting surface heated to 200 ° C. which is connected to the second extruder, The sheet integrated with the black stripes is fixed while being heat-laminated, and the sheet is integrated between the die roll for the incident surface heated to 100 ° C and the second die roll for the exit surface heated to 120 ° C. With the mutual alignment completed in advance, at a take-up speed of 1.5 m / min,
A double-sided lenticular lens sheet (product of the present invention) having a black light-absorbing convex portion on a non-light-condensing portion was manufactured by winding the roll heated at 110 ° C. while winding.

For comparison, a double-sided lenticular lens sheet having transparent convex portions was prepared in the same manner as above using an acrylic resin in which the colorant was not kneaded in the second extruder. Then, a black ink (Z043TP92-SUMI made by Toyo Ink) having a film thickness of about 10 μm is printed on only the flat surface of the convex portion by a roll coater, and a double-sided lenticular lens sheet having a light absorbing layer only on the flat surface of the convex portion. (Comparative sample) was produced.

Combining the above two lenticular lens sheets with separately manufactured Fresnel lens sheets,
As a result of observing an image in a bright room without using a predetermined transmission screen for a projection TV in which two sheets are integrated, the contrast of the comparative sample was remarkably lowered, especially when viewed from an oblique direction. On the other hand, even when the product of the present invention was viewed from an oblique direction, the contrast was not deteriorated and a high quality image could be viewed.

[0019]

As described above, according to the present invention, since the non-light-collecting part is formed of the resin containing the black colorant, the light-absorbing layer is formed together with the non-light-collecting part. As a result, it is possible to obtain a uniform and high-quality black stripe without unevenness in the thickness of the light absorption layer, pinholes, and the like, and without lowering the transmittance of the light collecting portion.

Further, a softened thermoplastic resin containing a black colorant is supplied in stripes on the surface of the softened transparent resin sheet, and a first mold having a first lenticular lens shape and Since the second lenticular lens and the second mold having the non-light-condensing portion having the desired shape are used for shaping, the light absorption layer is formed simultaneously with shaping of the lens shape without applying black ink or printing. can do. Therefore, the number of manufacturing processes is small, and it is possible to easily and stably manufacture at low cost.

[0021]

[Brief description of drawings]

FIG. 1 is a perspective view showing a lenticular lens sheet according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the same embodiment.

FIG. 3 is a schematic view showing a manufacturing apparatus of an embodiment of the manufacturing method of the present invention.

FIG. 4 is a diagram showing each die roll of the manufacturing apparatus of the embodiment.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 10 Light-transmissive resin sheet 11, 12 Lenticular lens 13 Non-condensing part 14 Light absorption layer 1 1st extruder 2 2nd extruder 3 Filling machine 4 1st metal mold | die roll 5 for an exit surface 5 Metal for an entrance surface Mold roll 6 Second mold roll for exit surface 7 Shaping roll

Claims (2)

[Claims] 1. A first lenticular lens is provided on one surface of a translucent resin sheet, and a second lenticular lens and a second lenticular lens are provided on the other surface at a position corresponding to the first lenticular lens. 1. A lenticular lens sheet in which a light absorption layer is provided at a position corresponding to the non-light-condensing portion of the lenticular lens 1, wherein the light absorption layer is formed of a resin containing a black colorant. Characteristic lenticular lens sheet. 2. A first lenticular lens is provided on one surface of a translucent resin sheet, and a second lenticular lens and a second lenticular lens are provided on the other surface at positions corresponding to the first lenticular lens. 1. A method for producing a lenticular lens sheet, wherein a light absorption layer is provided at a position corresponding to the non-light-condensing part of the lenticular lens of No. 1, in which a softened state in which a black coloring agent is contained on the surface of the translucent resin sheet in the softened state. The thermoplastic resin of No. 1 is supplied in a stripe shape, and shaping is performed by the first mold having the first lenticular lens shape, the second lenticular lens, and the second mold having the non-light-collecting portion having a desired shape. A method of manufacturing a lenticular lens sheet, comprising: