Patent EP0464499A2 successfully refreshed from Google Patents.
EP0464499A2
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Anisotropic light-scattering material, method for producing the same and lenticular lens for projection tv screen
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1991-06-20
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Granted: —
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Expires: 2011-06-20
Abstract
Abstract An anisotropic light-scattering material may be composed of transparent materials with anisotropic shapes regularly dispersed in a transparent matrix in a mutual positional relationship of parallel translation, which transparent materials with anisotropic shapes having a refractive index different from that of the transparent matrix. The anisotropic light-scattering materials exhibit a high scattering power in a direction perpendicular to the major axis or the longer edge of the transparent materials having anisotropic shapes, and therefore the light-scattering materials are useful as substituents for lenticular lenses for projection TV screens, and also as lamp-shades which require a sufficient light-scattering power.
Inventors
- 👤 Masahiro Ueda
- 👤 Kazumitsu Kawamura
- 👤 Tetsuro Ohno
- 👤 Shinichi Takemura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 08:13
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B5/0273; G02B5/0278; G02B30/00; G02B30/20; G02B30/26; G02B30/27; G02B5/0205; G02B5/0236; G02B5/0242; G02B5/0257; G02B5/0268; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
41 words
An anisotropic light-scattering material, comprising transparent materials with anisotropic shapes regularly dispersed in a transparent matrix in a mutual positional relationship of parallel translation, the transparent materials with anisotropic shapes having a refractive index different from that of the transparent matrix.
Claim 2
Dependent Claim
33 words
An anisotropic light-scattering material according to claim 1, wherein the difference in refractive index between the transparent matrix and the transparent materials having anisotropic shapes dispersed in the matrix is at least 0.001.
Claim 3
Dependent Claim
33 words
An anisotropic light-scattering material according to claim 2, wherein the difference in refractive index between the transparent matrix and the transparent materials having anisotropic shapes dispersed in the matrix is at least 0.01.
Claim 4
Dependent Claim
42 words
An anisotropic light-scattering material according to claim 1, wherein the transparent materials with anisotropic shapes have a particle size of 0.1 to 100 µm, with the proviso that the ratio of the maximum size to the minimum size is higher than 1.
Claim 5
Dependent Claim
42 words
An anisotropic light-scattering material according to claim 1, wherein the transparent matrix and the transparent materials with anisotropic shapes are individually composed of a resin selected from the group consisting of olefinic resins, styrene resins, (meth)acrylate resins, polyester resins and cellulose resins.
Claim 6
Dependent Claim
52 words
A method for preparing an anisotropic light-scattering material according to claim 1, wherein a phase separation type composition comprising at least two resins is subjected to a stretching operation, with the proviso that the resins are capable of forming a matrix and an anisotropic shaped material, respectively, and have different refractive indexes.
Claim 7
Dependent Claim
21 words
A method for preparing an anisotropic light-scattering material according to claim 6, wherein a T-die is used in the stretching operation.
Claim 8
Dependent Claim
24 words
A method for preparing an anisotropic light-scattering material according to claim 6, wherein the resin composition comprises an olefinic resin and a styrene resin.
Claim 9
Dependent Claim
21 words
A method for preparing an anisotropic light-scattering material according to claim 8, wherein the olefinic resin is a low density polyethylene.
Claim 10
Dependent Claim
22 words
A method for preparing an anisotropic light-scattering material according to claim 9, wherein the olefinic resin is a very low density polyethylene.
Claim 11
Dependent Claim
19 words
A method for preparing an anisotropic light-scattering material according to claim 8, wherein the styrene resin is a polystyrene.
Claim 12
Dependent Claim
30 words
A method for preparing an anisotropic light-scattering material according to claim 6, wherein the ratio of the matrix-forming resin to the anisotropic shaped material-forming resin is between 95/5 and 5/95.
Claim 13
Dependent Claim
30 words
A method for preparing an anisotropic light-scattering material according to claim 12, wherein the ratio of the matrix-forming resin to the anisotropic shaped material-forming resin is between 70/30 and 30/70.
Claim 14
Dependent Claim
83 words
A lenticular lens for a projection TV screen comprising an anisotropic light-scattering material which contains a transparent matrix and transparent materials with anisotropic shapes regularly dispersed in the transparent matrix in a mutual positional relationship of parallel translation, the transparent materials with anisotropic shapes having a refractive index different from that of the transparent matrix and having a particle size of 0.5 to 70 µm, with the proviso that the ratio of the maximum size to the minimum size is higher than 10.
Claim 15
Dependent Claim
47 words
A lenticular lens for a projection TV screen according to claim 14, wherein the transparent materials with anisotropic shapes have a particle size of 1 to 70 µm with the proviso that the ratio of the maximum size to the minimum size is between 15 and 30.
Claim 16
Dependent Claim
32 words
A lenticular lens for a projection TV screen according to claim 14, wherein the matrix resin comprises a very low density polyethylene, and the transparent materials with anisotropic shapes comprise a polystyrene.
References Cited (Backward Citations)
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