JPH04296740A - Lenticular lens sheet for transmission type screen - Google Patents

Abstract

PURPOSE:To increase the vertical visual field angle and decrease the loss of the quantity of light as to the lenticular lens sheet for the transmission type screen and its manufacture device. CONSTITUTION:Lenticular lenses 2 and 5 are formed on both surfaces of a sheet type screen base material 1, formed continuously by an extrusion molding means such as an extruder, by using a pair of heat forming roll means; and microlenses 4 are formed closely on the surface of each emissive light side lenticular lens 5 and external light absorbing layers 3 are integrally formed on the emissive light side in a striped or mesh shape at constant pitches. Consequently, the loss of the quantity of light and the diffusion of light are improved and the low-cost lenticular lens sheet 10 of simple constitution is obtained.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a lenticular lens sheet for a transmission screen that is effective for use in a transmission projection television, and a method and apparatus for manufacturing the same. This invention relates to a lenticular lens sheet for a transmission type screen, which is formed by integrally molding a lens.

0002

2. Description of the Related Art Conventionally, as shown in a projection type television receiver in FIG. 4, a transmission type screen has a structure including a red light emitting CRT 11, a green light emitting CRT 12, and a blue light emitting CRT 1.
3 and red light projection lens 14, green light projection lens 15,
A structure in which a Fresnel lens 17 and a lenticular lens sheet 18 are placed one on top of the other in front of a blue light projection lens 16 is used. This lenticular lens sheet 18 has cylindrical lenticular lenses arranged on both sides of a screen base material. Furthermore, a protruding external light absorbing layer is formed in a striped shape at a predetermined pitch on the non-concentrating portion of the outgoing light side lenticular lens, and black stripe members are provided at predetermined positions on the surface of this external light absorbing layer.

0003

However, the lenticular lens sheet 18 having the above structure has a small viewing angle in the vertical direction and requires improvement. As an improvement measure, a method of laminating a film containing spherical microbeads on the surface of the outgoing light side of the lenticular lens sheet 18 (Japanese Patent Application Laid-Open No. 1-161328)
A rear projection screen (Japanese Patent Application Laid-Open No. 2003-100001) has regular unevenness formed on the lens unit surface of the rear projection surface and the exit surface, which has a constant array pitch in the vertical direction and the cross-sectional lens shape in the horizontal direction is constant regardless of the cross-sectional position. 2-306231) and the like have been proposed. However, JP-A-1-16132
Even with the construction method of Publication No. 8, it is difficult to provide only one or two layers of spherical beads in the surface layer of the lenticular lens sheet in a densely arranged and connected state, and light loss improvement and light diffusion are insufficient. be. Furthermore, Unexamined Japanese Patent Publication No. 2-30
Even in the configuration disclosed in Japanese Patent No. 6231, light diffusion in the vertical direction is not completely uniform and is insufficient. In view of the above problems, the present invention provides a lenticular lens sheet for a transmission type screen that improves light loss and light diffusion, and a method for manufacturing the same.
It provides equipment.

0004

[Means for Solving the Problems] In order to solve the above problems, the structure of the lenticular lens sheet for a transmission type screen of the present invention is such that lenticular lenses are formed on both main planes of a screen base material and provided on the outgoing light side. In a lenticular lens sheet for a transmissive screen, in which an antireflection black stripe is provided on a striped or matrix-like (mesh-like) external light absorption layer, the entire surface of the lenticular lens on the outgoing light side is covered with spherical or aspherical microscopic particles. Lenses are integrally molded in a densely packed manner vertically and horizontally.

Further, the method and apparatus for manufacturing a lenticular lens sheet for a transmission type screen of the present invention continuously forms a sheet-like screen base material by extrusion molding means using an extruder and a T-die, and combines this screen base material into a pair. A lenticular lens in which a striped or mesh-like external light absorbing layer is formed on one main plane side using a heated forming roll, and minute lenses are densely arranged on the surface on at least the other main plane side. It has an integrally molded structure.

[0006]

[Function] With the above-described structure, the present invention not only improves light loss and light diffusion, but also makes it possible to obtain a lenticular lens sheet for a transmission type screen with a simple structure and at low cost.

[0007]

[Example] The following is an example of the present invention shown in FIGS. 1 to 3.
This will be explained with reference to the drawings shown in . FIG. 1 shows a sectional view of a lenticular lens sheet for a transmission type screen according to an embodiment of the present invention. In FIG. 1, a lenticular lens sheet 10 has lenticular lenses 2 and 5 formed on both main planes of a screen base material 1. Next, striped external light absorbing layers 3 are arranged at a pitch of about 1 mm in the non-concentrating portion of the lenticular lens provided on the output light side. Further, on the surface of the lenticular lens 5 on the outgoing light side, that is, over almost the entire surface of the lenticular lens 5 in the width direction and vertical direction, a micro convex lens 4 (with a radius of about 10 to 50 μm in the embodiment) having a spherical or aspherical shape is provided. It is a structure in which the elements are arranged in a dense manner vertically and horizontally so that they are connected to each other. The lenticular lens sheet 10 formed as described above is further provided with a predetermined conductive member or the like on the surface of the external light absorbing layer 3 to form a black stripe. (Not shown) With the above configuration, the lenticular lens sheet 10 of the present invention has an expanded vertical viewing angle and reduced optical loss. In the above embodiment, as for the shape of the microlens 4 to be arranged, it goes without saying that any lens having an aspherical shape other than a spherical shape may be used. is preferably 10 to 50 μm. In addition to forming the external light absorbing layer 3 in a striped pattern with a predetermined pitch, it is also possible to arrange it in a matrix (mesh pattern).

Next, a method and apparatus for manufacturing a lenticular lens sheet for a transmission type screen according to the present invention will be explained.

FIG. 2 is a side view of essential parts showing an embodiment of the manufacturing apparatus of the present invention. In the method of manufacturing the lenticular lens sheet 10 for a transmission screen of the present invention, first, a sheet-like screen base material 1 is continuously formed to a thickness of about 1 mm by extrusion molding means using an extruder 7 and a T-die (not shown). Extrude to size. Next, the sheet-like screen base material 1 is molded into a predetermined shape on both sides by a pair of heating rolls 8 and 9, respectively. Specifically, the lenticular lens 5 and the microlens 4 are integrally molded on one principal plane, that is, the surface on the exit light side, by a heated forming roll 9 heated to a predetermined temperature, for example, 90 degrees Celsius, and stripes are formed on the non-condensing part of the lenticular lens. Alternatively, the external light absorbing layer 3 with mesh-like protrusions is formed. moreover,
The heating forming roll 8 press-forms the lenticular lens 2 on the other main plane side, that is, on the incident light side. Naturally, the heat forming roll 8 has a predetermined surface shape suitable for forming the cylindrical lenticular lens 2. Similarly, the heat forming roll 9 is provided with a predetermined surface shape suitable for forming the lenticular lens 5, the microlens 4, and the external light absorbing layer 3. The surface shape of the heat forming roll 9 is shown in an enlarged scale in FIG. The heat forming roll 9 has recesses 43 for forming an external light absorbing layer on the roll surface.
The lenticular lens molding recess 45 and the microlens molding recess 44 are formed in a predetermined manner by NC processing (numerical control), for example, by processing means such as an NC milling machine, an NC drilling machine, or a machining center. In detail, as the NC machining means for the microlens molding recess 44, any means such as electric discharge machining, etching machining, YAG or CO2 laser machining, electroforming machining, machining using a forming drill, etc. may be used. Of course, it goes without saying that the shapes of the external light absorbing layer 3, the lenticular lenses 2 and 5, and the microlenses 4 are set in anticipation of changes in shape after press molding. The mirror finish of the micro lens molding concave portion 44 is #
This may be carried out in a predetermined manner using a diamond paste of approximately #5000 to #10000 and a soft pad using an NC processing device or the like. As described above, according to the embodiments of the present invention,
The screen base material 1 is formed by a pair of heated roll means.
By integrally molding a lenticular lens, a microlens, and an external light absorbing layer on the output light side, it is possible to expand the viewing angle in the vertical direction and reduce light loss. In the above embodiments, the external light absorbing layer may have a concave shape instead of a protruding shape, and a flat plate-like forming means may be used instead of the pair of heat-forming roll means. .

0010

Effects of the Invention As described above, the lenticular lens sheet for a transmission type screen of the present invention not only improves light loss and light diffusion, but also expands the vertical viewing angle.
There is no need to configure and adhere the film sheet in a separate device in the conventional configuration, and the manufacturing process and equipment can be simplified and the cost of the lenticular lens sheet can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a lenticular lens sheet for a transmission type screen according to an embodiment of the present invention.

FIG. 2 is a side view of an embodiment of the lenticular lens sheet manufacturing apparatus for a transmission type screen of the present invention.

FIG. 3 is an enlarged sectional view of a heat forming roll 9 used in an example of the present invention.

[Figure 4] Configuration of a projection television receiver and a plan view of a conventional lenticular lens sheet

[Explanation of symbols]

1 Screen base material 2 Lenticular lens 3 External light absorption layer 4 Microlens 5 Lenticular lens 7 Extruder 8 Heat forming roll 9 Heat forming roll 10 Lenticular lens sheet 21 Recess for lenticular lens molding 43 Recess for external light absorbing layer molding 44 Micro lens molding recess for

Claims (5)

[Claims] 1. A lenticular lens sheet comprising a lenticular lens formed on at least one main plane of a sheet-like screen base material, wherein microlenses are densely integrated over the entire surface of the lenticular lens on the light output side of the screen base material. A lenticular lens sheet for transparent screens that is characterized by being molded. 2. A lenticular lens sheet in which lenticular lenses are formed on both sides of a sheet-like screen base material, and anti-reflection black stripes are provided on a striped external light absorbing layer provided on the outgoing light side. A lenticular lens sheet for a transmission type screen, characterized by minute lenses integrally molded in a dense manner over the entire surface of the lenticular lens on the light emitting side of the material. 3. The lenticular lens sheet for a transmission screen according to claim 1, wherein the microlenses have a spherical or aspherical shape. 4. Extrusion molding means for extrusion molding a continuous sheet-like screen base material, lenticular lenses on both sides of the screen base material, microlenses on the entire surface of the lenticular lens on the outgoing light side, and a stripe on the outgoing light side. 1. A lenticular lens sheet manufacturing apparatus for a transmission type screen, comprising a pair of thermoforming means for press-molding an external light absorbing layer in a shape or a mesh shape. 5. The production of a lenticular lens sheet for a transmission type screen according to claim 4, wherein either electric discharge machining or laser machining is used as the processing means for the microlens molding recesses provided in the heating molding means. Device.