Method of Designing a Diffusion Film, a Process For Producing the Same, and a Diffusion Film Obtained Thereby
AssigneeFUJIFILM Corporation
InventorsToshiaki Endo, Akihiko Takeda, Osamu Iwasaki
Life of this patent
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Abstract
A transparent support and plural types of particle groups having different particle size distributions each other that are to be contained in a light diffusing layer are provided. a blending ratio of the plural types of particle groups is computed such that a space packing ratio of respective particles in the light diffusing layer becomes a specified space packing ratio and the plural types of particle groups having been blended in the computed blending ratio are dispersed on the transparent support, whereby the light diffusing layer is formed on the transparent support. Thus, a diffusion film can be produced simply and at low cost.
Claims19
A method of designing a diffusion film that has a light diffusing layer on a transparent support and diffuses incident light so that said incident light emerges as diffused light, comprising the steps of:
- specifying plural types of particle groups that are to be contained in said light diffusing layer, said plural types of particle groups having different particle size distributions each other;
- setting a space packing ratio of said plural types of particle groups in said light diffusing layer;
- and
- computing a blending ratio of the respective plural types of particle groups such that said space packing ratio is obtained.
A method of designing a diffusion film that has a light diffusing layer on a transparent support and diffuses incident light so that said incident light emerges as diffused light, comprising the steps of:
- setting a space packing ratio of particle groups that are to be contained in said light diffusing layer;
- computing any one of parameters selected from the group consisting of means and variances of particle size distributions of said particle groups, as well as constants in a binomial distribution by which said particle size distributions of said particle groups are approximated such that said space packing ratio is obtained;
- and
- designing said light diffusing layer using said particle groups having said particle size distributions that are specified by the parameter.
A process for producing a diffusion film that has a light diffusing layer on a transparent support and diffuses incident light so that said incident light emerges as diffused light, comprising the steps of:
- providing both said transparent support and plural types of particle groups that are to be contained in said light diffusing layer, said plural types of particle groups having different particle size distributions each other;
- computing a blending ratio of said plural types of particle groups such that a space packing ratio of said respective particles in said light diffusing layer becomes a specified space packing ratio;
- and
- dispersing and adhering said plural types of particle groups having been blended in the computed blending ratio on said transparent support to form said light diffusing layer on said transparent support.
The producing method according to 10, wherein
- said plural types of particle groups are formed of a polymer having optical transparency.
A process for producing a diffusion film that has a light diffusing layer on a transparent support and diffuses incident light so that said incident light emerges as diffused light, comprising the steps of:
- computing preliminarily any one of parameters selected from the group consisting of means and variances of particle size distributions of particle groups, as well as constants in a binomial distribution by which said particle size distributions of said particle groups are approximated such that a space packing ratio of said particle groups to be contained in said light diffusing layer becomes a specified space packing ratio;
- and
- allowing the particle groups having the particle size distributions that are specified by the computed parameter to disperse and adhere on said transparent support to form said light diffusing layer on said transparent support.
A diffusion film that is produced by a producing process for producing a diffusion film that has a light diffusing layer on a transparent support and diffuses incident light so that said incident light emerges as diffused light, comprising the steps of;
- providing both said transparent support and plural types of particle groups that are to be contained in said light diffusing layer, said plural types of particle groups having different particle size distributions each other;
- computing a blending ratio of said plural types of particle groups such that a space packing ratio of said respective particles in said light diffusing layer becomes a specified space packing ratio;
- and
- dispersing and adhering said plural types of particle groups having been blended in the computed blending ratio on said transparent support to form said light diffusing layer on said transparent support.
Dependencies are inferred from the claim text.