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Screen

A projection screen and film layer technology, applied in the field of projection screens, can solve problems such as inconvenient viewing angles and high equipment prices

Inactive Publication Date: 2005-07-13
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using a holographic image display device, not only the projection angle must be controlled within a specific range, but also it is inconvenient due to the limited viewing angle, and there is a problem of high equipment prices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0083] At 250°C, after melting and mixing 87% by weight of propylene homopolymer (PP2), 10% by weight of high-density polyethylene (HDPE), and 3% by weight of calcium carbonate with an extruder, feed to the temperature setting It was extruded into a film at a temperature of 250° C., and cooled with a cooling roll to obtain an unstretched film. This unstretched film was stretched in the longitudinal direction at a four-fold ratio by heating at 135°C to obtain a uniaxially stretched film. This thin film is used as the base material layer (b).

[0084] At 250°C, with another extruder, a mixture of 52% by weight of propylene homopolymer (PP1), 3% by weight of high-density polyethylene (HDPE), and 45% by weight of calcium carbonate was melt-mixed and refined , fed to a die set at a temperature of 250°C, extruded into a film, laminated as the surface layer (a) and inner layer (c) on both sides of the above-mentioned four-fold stretched film, after cooling to 60°C , to obtain a thr...

manufacture example 2

[0087] With the mixture that is formed by the PP2 of 87% by weight, the HDPE of 10% by weight, and the calcium carbonate of 3% by weight as base material layer (b), with the HDPE by the 52% by weight of PP1, 3% by weight and 45% by weight % of calcium carbonate as the surface layer (a) and inner layer (c), after melting and mixing with different extruders at 250°C, they are fed to a co-extrusion die set at 250°C In the mold, the laminate obtained after lamination in the mold was extruded into a film, and cooled with a cooling roll to obtain an unstretched film. This unstretched film was stretched at a ratio of four times in the longitudinal direction by heating at 135° C. to obtain a uniaxially stretched film.

[0088] Next, this stretched film was heated to 164° C. and stretched at a ratio of nine times in the transverse direction by a tenter. Then, after heat treatment at 160° C., cooling to 60° C., and cutting off the edge, a multilayer stretched resin film layer with a th...

manufacture example 3

[0090] A multilayer stretched resin film layer having a thickness of 77 μm (a / b / c=18 μm / 41 μm / 18 μm) was prepared in the same manner as in Production Example 1 except that the extrusion amount of the resin was changed.

[0091] On the surface layer (a) side of the multilayer stretched resin film, an ink-jet coating agent having the following composition is coated on the surface layer (a) side of the multilayer stretched resin film according to the amount to form a coating layer having a thickness of 40 μm after drying, and allowed to dry, thereby Coating is set.

[0092] Silica fine particles (average particle diameter: 0.3 μm) (solid content ratio: 18%) 76% by weight

[0093] Polyvinyl alcohol (solid content ratio 10%) 20% by weight

[0094] Melamine formaldehyde resin (solid content ratio 30%) 2% by weight

[0095] Cationic acrylic polymer (30% solid content ratio) 2% by weight

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PUM

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Abstract

A projection screen characterized by comprising a film layer (A) containing a thermoplastic resin having a total light transmittance of 30-80% and a total light reflectance of 20-70%. Regardless of reflected light or transmitted light, the projection screen can display images.

Description

technical field [0001] The invention relates to a projection screen. Specifically, it relates to a projection screen capable of displaying an image regardless of whether reflected light or transmitted light is used. Background technique [0002] As one of the demonstration and publicity methods, projection devices such as slide projectors, overhead projectors, and liquid crystal projectors are generally used to project images on a projection screen. At this time, the images seen on the projection screen are usually reflected light emitted from the projection surface, and the range of images that can be viewed is limited to one side. [0003] On the other hand, there are devices that display images using transmitted light. For example, a hologram display device proposed in JP-A-2000-155374. However, when using a holographic image display device, not only the projection angle must be controlled within a specific range, but also the inconvenience is caused by the limited vie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/60
CPCG03B21/60
Inventor 高桥友嗣上田隆彦
Owner YUPO CORP
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