JPH08220310A - Light diffusing film - Google Patents
Light diffusing filmInfo
- Publication number
- JPH08220310A JPH08220310A JP4494595A JP4494595A JPH08220310A JP H08220310 A JPH08220310 A JP H08220310A JP 4494595 A JP4494595 A JP 4494595A JP 4494595 A JP4494595 A JP 4494595A JP H08220310 A JPH08220310 A JP H08220310A
- Authority
- JP
- Japan
- Prior art keywords
- film
- beads
- transparent polypropylene
- polypropylene film
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004743 Polypropylene Substances 0.000 claims abstract description 43
- -1 polypropylene Polymers 0.000 claims abstract description 36
- 229920001155 polypropylene Polymers 0.000 claims abstract description 34
- 239000011324 bead Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 238000002834 transmittance Methods 0.000 claims description 19
- 238000009792 diffusion process Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 abstract description 8
- 229920005906 polyester polyol Polymers 0.000 abstract description 4
- 229920000178 Acrylic resin Polymers 0.000 abstract description 2
- 239000004925 Acrylic resin Substances 0.000 abstract description 2
- 229920000877 Melamine resin Polymers 0.000 abstract description 2
- 239000003822 epoxy resin Substances 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 229920000647 polyepoxide Polymers 0.000 abstract description 2
- 229920002050 silicone resin Polymers 0.000 abstract description 2
- 239000004640 Melamine resin Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 2
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920006289 polycarbonate film Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶ディスプレイ、照
明体、看板等に使用して光を拡散させるための光拡散フ
イルムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusing film for use in liquid crystal displays, illuminators, signboards, etc. to diffuse light.
【０００２】[0002]
【従来の技術】光拡散フイルムとして従来、ポリエチレ
ンテレフタレートフイルムの表面に、表面が平滑なビー
ズを分散した樹脂層を形成してなる光拡散フイルムが知
られている（日経マイクロデバイス（日経ＢＰ社発行）
１９９３年２月号９８〜９９頁参照）。該光拡散フイル
ムは、発光効率を上げるためにそれまでの光拡散フイル
ムに比して輝度を向上させたものである。そして、該光
拡散フイルムは、光源と表示体の間に設置されて光を均
一に広げて面光源とするための導光板を通過した光の効
率を上げるために、表示体と導光板との間に通常２枚が
一体となって設置され使用されている。2. Description of the Related Art Conventionally, as a light diffusing film, a light diffusing film in which a resin layer in which beads having a smooth surface are dispersed is formed on the surface of a polyethylene terephthalate film is known (Nikkei Microdevice (published by Nikkei BP). )
See the February 1993 issue, pages 98-99). The light-diffusing film has improved brightness as compared with the light-diffusing films used so far in order to increase the luminous efficiency. The light diffusing film is installed between the light source and the display body to uniformly spread the light and increase the efficiency of the light passing through the light guide plate for forming a surface light source. Two of them are usually installed and used as one unit between them.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の光拡散
フイルムは、粒径が約１０〜１５μｍの表面が平滑なビ
ーズを使用しており、輝度は向上したもののまだ充分と
はいえず、実用上はさらに輝度の高い光拡散フイルムが
要望されてきた。そこで、本発明者は鋭意研究の結果、
ビーズとして表面が多数の微細な凹凸状のビーズを使用
することによりさらに輝度の高い光拡散フイルムを発明
し、既に出願した（特願平６−２４２３２２号参照）。
しかしながら、本発明者はより一層輝度の高い光拡散フ
イルムを得るべく研究を続けた結果本発明を完成させる
ことが出来たもので、本発明は、非常に輝度の高い光拡
散フイルムを提供するものである。However, the conventional light-diffusing film uses beads having a particle size of about 10 to 15 μm and a smooth surface, and although the brightness is improved, it cannot be said to be sufficient and is practically used. There has been a demand for a light diffusing film having higher brightness. Therefore, as a result of earnest research, the inventor has found that
A light diffusing film having higher brightness was invented by using beads having a large number of fine irregularities on the surface as beads, and a patent has already been filed (see Japanese Patent Application No. 6-242322).
However, the present inventor has completed the present invention as a result of continuing research to obtain a light diffusing film having higher brightness, and the present invention provides a light diffusing film having extremely high brightness. Is.
【０００４】[0004]
【課題を解決するための手段】本発明は、ヘイズ値１．
３以下で平行光線透過率９０％以上の透明ポリプロピレ
ンフイルムの表面に、ビーズを分散した樹脂層を形成し
たことを特徴とする光拡散フイルムである。The present invention has a haze value of 1.
A light diffusion film comprising a transparent polypropylene film having a parallel light transmittance of 90% or more and a resin layer having beads dispersed therein.
【０００５】透明ポリプロピレンフイルムは、ヘイズ値
１．３以下のものを使用する。透明ポリプロピレンフイ
ルムのヘイズ値が１．３より高いと、透明ポリプロピレ
ンフイルムの濁り具合が高くなって輝度があまり向上し
ない。A transparent polypropylene film having a haze value of 1.3 or less is used. When the haze value of the transparent polypropylene film is higher than 1.3, the turbidity of the transparent polypropylene film is increased and the brightness is not improved so much.
【０００６】透明ポリプロピレンフイルムは、平行光線
透過率９０％以上のものを使用する。透明ポリプロピレ
ンフイルムの平行光線透過率が９０％より低いと、透過
する光線の絶対量が少なくなって輝度があまり向上しな
い。The transparent polypropylene film has a parallel light transmittance of 90% or more. If the parallel light transmittance of the transparent polypropylene film is lower than 90%, the absolute amount of light passing therethrough decreases and the brightness does not improve so much.
【０００７】透明ポリプロピレンフイルムの厚さは特に
限定しないが、７５〜２００μｍが好ましい。透明ポリ
プロピレンフイルムの厚さが７５μｍより薄いと、透明
ポリプロピレンフイルムがカールし易くなる。透明ポリ
プロピレンフイルムの厚さが２００μｍより厚いと、輝
度があまり向上しなくなる。The thickness of the transparent polypropylene film is not particularly limited, but is preferably 75 to 200 μm. When the thickness of the transparent polypropylene film is less than 75 μm, the transparent polypropylene film is likely to curl. When the thickness of the transparent polypropylene film is thicker than 200 μm, the brightness is not improved so much.
【０００８】透明ポリプロピレンフイルムの表面すなわ
ち片面又は両面に、ビーズを分散した樹脂層を形成す
る。透明ポリプロピレンフイルムの表面には、コロナ放
電処理、アンカーコート処理、火炎処理等の表面処理を
施しておいてもよい。樹脂層に使用する樹脂は特に限定
するものではなく、各種の樹脂が使用出来るが、透明
性、ビーズ分散性があり、耐光性、耐湿性、耐熱性があ
る樹脂が特に好ましい。具体的には例えば、ポリエステ
ルポリオール、アクリル系樹脂、メラミン樹脂、シリコ
ーン樹脂、エポキシ樹脂などが挙げられる。A resin layer having beads dispersed therein is formed on the surface of the transparent polypropylene film, that is, on one side or both sides. The surface of the transparent polypropylene film may be subjected to surface treatment such as corona discharge treatment, anchor coat treatment, and flame treatment. The resin used for the resin layer is not particularly limited, and various resins can be used, but resins having transparency, bead dispersibility, light resistance, moisture resistance, and heat resistance are particularly preferable. Specific examples include polyester polyols, acrylic resins, melamine resins, silicone resins, and epoxy resins.
【０００９】ビーズとしては特に限定するものではな
く、各種のプラスチックビーズやガラスビーズが使用で
きる。ビーズは、従来の光拡散フイルムに使用されてい
る粒径が約１０〜１５μｍの表面が平滑なビーズを使用
するよりも、粒径が約１５μｍ以上で表面が多数の微細
な凹凸状のビーズを主体としたものを使用する方が、輝
度向上には特に好ましい。The beads are not particularly limited, and various types of plastic beads and glass beads can be used. Rather than using beads with a smooth surface with a particle size of about 10 to 15 μm, which are used in conventional light diffusion films, beads with a particle size of about 15 μm or more and a large number of fine irregularities on the surface are used. It is particularly preferable to use the main component for improving the brightness.
【００１０】ビーズを分散した樹脂層には、適宜の量の
適宜の分散剤を混入してもよく、この様にしたものも勿
論本発明に含まれるものである。また、樹脂層には、適
宜の量の蛍光染料を添加してもよく、この様にした場合
は輝度をより向上させることができ、この様にしたもの
も勿論本発明に含まれるものである。The resin layer in which the beads are dispersed may be mixed with an appropriate amount of an appropriate dispersant, and such a thing is of course included in the present invention. Further, an appropriate amount of fluorescent dye may be added to the resin layer, and in such a case, the brightness can be further improved. Of course, such a thing is also included in the present invention. .
【００１１】ヘイズ値１．３以下で平行光線透過率９０
％以上の透明ポリプロピレンフイルムを使用すると、何
故輝度が向上するかは現時点では必ずしも明らかではな
いが、一つには、１．４５〜１．４８の屈折率等透明ポ
リプロピレンの性質により純粋に近づいたためとも思わ
れる。しかし、屈折率が１．４５〜１．４８で平行光線
透過率９０％以上の透明ポリプロピレンフイルムであっ
ても、例えばヘイズ値が１．３より高いと輝度はそれ程
向上しない。また、一般的には、フイルムの透明性が悪
いと光線の散乱現象や遮蔽現象が生じるので、透明性の
良好なフイルムが輝度の向上のためには好ましいと考え
ることもできるが、ヘイズ値１．３以下で平行光線透過
率９０％以上という透明性の良好なフイルムであって
も、屈折率が１．５５以上の透明アクリルフイルム、透
明トリアセテートフイルム、透明ポリカーボネートフイ
ルム、透明ポリエチレンテレフタレートフイルム等では
輝度はそれ程向上しない。結局、屈折率とヘイズ値と平
行光線透過率とがあいまって相乗効果をもたらし、極め
て高い輝度を得ることが出来たと推測出来る。A parallel light transmittance of 90 at a haze value of 1.3 or less.
%, It is not always clear why the brightness is improved by using the transparent polypropylene film. However, one reason is that the properties of the transparent polypropylene such as the refractive index of 1.45 to 1.48 are closer to being pure. It seems also. However, even with a transparent polypropylene film having a refractive index of 1.45 to 1.48 and a parallel light transmittance of 90% or more, for example, if the haze value is higher than 1.3, the brightness is not so improved. In general, when the transparency of the film is poor, a light ray scattering phenomenon or a light-shielding phenomenon occurs. Therefore, a film having good transparency can be considered to be preferable for improving the brightness. Even if the transparent film having a parallel light transmittance of 90% or more at a ratio of 0.3 or less and having a good transparency is used, the brightness of a transparent acrylic film having a refractive index of 1.55 or more, a transparent triacetate film, a transparent polycarbonate film, a transparent polyethylene terephthalate film, etc. Does not improve so much. In the end, it can be inferred that the refractive index, the haze value, and the parallel light transmittance are combined to bring about a synergistic effect, and an extremely high brightness can be obtained.
【００１２】[0012]
実施例１ ヘイズ値１．３で平行光線透過率９０％の厚さ２００μ
ｍの透明ポリプロピレンフイルム（屈折率１．４５：出
光石油化学社製ＰＰフイルム．スーパーピュアレイ）の
片面に、ビーズとして粒径が約１５μｍで表面が多数の
微細な凹凸状のポリアクリル酸エステルビーズ（積水化
成社製テクポリマーＥＡＸ−１５）を使用して、下記の
配合塗料を塗布乾燥して、ビーズを分散した厚さ約１７
μｍの樹脂層を形成し、本発明の光拡散フイルムを得
た。 （配合塗料） ポリエステルポリオール １６．０重量部 （東洋紡績社製ポリエステルポリオール） ビーズ １０．０重量部 （積水化成社製テクポリマーＥＡＸ−１５） 溶剤 ２２．５重量部 得られた光拡散フイルムについて輝度を測定した。輝度
の測定方法は、スクリーン印刷ドットのある導光板の上
に得られた光拡散フイルムを２枚重ねて置き、太さ５ｍ
ｍの冷陰極管を光源として導光板のサイドから光を当
て、導光板及び２枚の光拡散フイルムを通過して拡散し
てくる光量を、光拡散フイルムから３０ｃｍのところに
固定した輝度計（ミノルタ社製ＳＬ−１１０）で測定し
た。輝度の測定結果は表１に示す通りであった。Example 1 A haze value of 1.3 and a parallel light transmittance of 90% and a thickness of 200 μm.
m of transparent polypropylene film (refractive index 1.45: PP film made by Idemitsu Petrochemical Co., Ltd., Super Pure Array), one side of which has a particle diameter of about 15 μm and a large number of fine irregular polyacrylic ester beads on the surface. (Sekisui Kasei Co., Ltd. techpolymer EAX-15) was used to coat and dry the following compounding paint to obtain beads having a thickness of about 17
A resin layer of μm was formed to obtain the light diffusion film of the present invention. (Compound paint) 16.0 parts by weight of polyester polyol (Polyester polyol manufactured by Toyobo Co., Ltd.) 10.0 parts by weight of beads (Techpolymer EAX-15 manufactured by Sekisui Kasei Co., Ltd.) 22.5 parts by weight of solvent Luminance of the obtained light diffusion film Was measured. The brightness is measured by placing two obtained light-diffusing films on a light guide plate with screen-printed dots and setting the thickness to 5 m.
Luminance meter that irradiates light from the side of the light guide plate using the cold cathode tube of m as a light source, and fixes the amount of light diffused through the light guide plate and the two light diffusion films at 30 cm from the light diffusion film ( It was measured with Minolta SL-110). The measurement result of the luminance is as shown in Table 1.
【００１３】実施例２ ビーズとして粒径が約３０μｍで表面が多数の微細な凹
凸状のポリメタクリル酸エステルビーズ（積水化成社製
テクポリマーＢＭ３０Ｘ−３０）を使用した他は実施例
１と同様にして光拡散フイルムを得て輝度を測定した。Example 2 As in Example 1, except that polymethacrylic acid ester beads (Techpolymer BM30X-30, manufactured by Sekisui Kasei Co., Ltd.) having fine irregularities with a particle size of about 30 μm and a large number of surfaces were used as beads. A light diffusion film was obtained to measure the brightness.
【００１４】比較例１ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値２．０で平行光線透過率９１％の厚さ７０μｍの透
明ポリプロピレンフイルム（屈折率１．４６：本州製紙
社製ＰＰフイルム．アルファンＳＹ１０１）を使用した
他は実施例１と同様にして光拡散フイルムを得て輝度を
測定した。Comparative Example 1 Instead of the transparent polypropylene film of Example 1, a 70 μm thick transparent polypropylene film having a haze value of 2.0 and a parallel light transmittance of 91% (refractive index 1.46: PP film manufactured by Honshu Paper Co., Ltd.) The light diffusion film was obtained and the brightness was measured in the same manner as in Example 1 except that Alfan SY101) was used.
【００１５】比較例２ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値３．１で平行光線透過率９０％の厚さ５０μｍの透
明ポリプロピレンフイルム（屈折率１．４７：二村化学
社製ＰＰフイルム．ＦＯＰ）を使用した他は実施例１と
同様にして光拡散フイルムを得て輝度を測定した。Comparative Example 2 Instead of the transparent polypropylene film of Example 1, a transparent polypropylene film having a haze value of 3.1 and a parallel light transmittance of 90% and a thickness of 50 μm (refractive index 1.47: PP film manufactured by Nimura Chemical Co., Ltd.). .FOP) was used and a light diffusion film was obtained in the same manner as in Example 1 to measure the luminance.
【００１６】比較例３ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値３．８で平行光線透過率９０％の厚さ２５μｍの透
明ポリプロピレンフイルム（屈折率１．４７：二村化学
社製ＰＰフイルム．ＣＰＦＴＧ）を使用した他は実施例
１と同様にして光拡散フイルムを得て輝度を測定した。Comparative Example 3 Instead of the transparent polypropylene film of Example 1, a transparent polypropylene film having a haze value of 3.8 and a parallel light transmittance of 90% and a thickness of 25 μm (refractive index 1.47: PP film manufactured by Nimura Chemical Co., Ltd.). .CPFTG) was used and a light diffusion film was obtained in the same manner as in Example 1 to measure the luminance.
【００１７】比較例４ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値７．４で平行光線透過率８６％の厚さ５０μｍの透
明ポリプロピレンフイルム（屈折率１．５０：興人社製
ＰＰフイルム．ＰＰ−Ｒ）を使用した他は実施例１と同
様にして光拡散フイルムを得て輝度を測定した。Comparative Example 4 Instead of the transparent polypropylene film of Example 1, a transparent polypropylene film having a haze value of 7.4 and a parallel light transmittance of 86% and a thickness of 50 μm (refractive index 1.50: PP film manufactured by Kojinsha Co., Ltd.). .PP-R) was used and the light diffusion film was obtained in the same manner as in Example 1 to measure the luminance.
【００１８】比較例５ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値０．２で平行光線透過率９３％の厚さ６０μｍの透
明アクリルフイルム（屈折率１．５８：三菱レイヨン社
製アクリルフイルム）を使用した他は実施例１と同様に
して光拡散フイルムを得て輝度を測定した。Comparative Example 5 Instead of the transparent polypropylene film of Example 1, a transparent acrylic film having a haze value of 0.2 and a parallel light transmittance of 93% and a thickness of 60 μm (refractive index 1.58: acrylic film manufactured by Mitsubishi Rayon Co., Ltd.). ) Was used and a light diffusion film was obtained in the same manner as in Example 1 to measure the luminance.
【００１９】比較例６ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値０．３で平行光線透過率９２％の厚さ１００μｍの
透明トリアセテートフイルム（屈折率１．５６：日本合
成化学社製ＴＡＣフイルム）を使用した他は実施例１と
同様にして光拡散フイルムを得て輝度を測定した。Comparative Example 6 Instead of the transparent polypropylene film of Example 1, a transparent triacetate film having a haze value of 0.3 and a parallel light transmittance of 92% and a thickness of 100 μm (refractive index 1.56: TAC manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). A light diffusing film was obtained in the same manner as in Example 1 except that the film) was used, and the brightness was measured.
【００２０】比較例７ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値０．７で平行光線透過率９０％の厚さ２００μｍの
透明ポリカーボネートフイルム（屈折率１．５８：三菱
ガス化学社製ＰＣフイルム）を使用した他は実施例１と
同様にして光拡散フイルムを得て輝度を測定した。Comparative Example 7 Instead of the transparent polypropylene film of Example 1, a transparent polycarbonate film having a haze value of 0.7 and a parallel light transmittance of 90% and a thickness of 200 μm (refractive index 1.58: PC manufactured by Mitsubishi Gas Chemical Company, Inc. A light diffusing film was obtained in the same manner as in Example 1 except that the film) was used, and the brightness was measured.
【００２１】比較例８ 実施例１の透明ポリプロピレンフイルムにかえて、ヘイ
ズ値１．２で平行光線透過率８９％の厚さ１００μｍの
透明ポリエチレンテレフタレートフイルム（屈折率１．
５５：ダイアホイル社製ＰＥＴフイルム．Ｏ−３００
Ｅ）を使用した他は実施例１と同様にして光拡散フイル
ムを得て輝度を測定した。 （以下余白）Comparative Example 8 Instead of the transparent polypropylene film of Example 1, a transparent polyethylene terephthalate film having a haze value of 1.2 and a parallel light transmittance of 89% and a thickness of 100 μm (refractive index 1.
55: PET film manufactured by DIAFOIL. O-300
A light diffusing film was obtained in the same manner as in Example 1 except that E) was used to measure the luminance. (Below margin)
【００２２】表１ （粒径約１５μｍのポリアクリル酸エステルビーズ使用（但し、実 施例２は粒径約３０μｍのポリメタクリル酸エステルビーズ使用）） フイルム種類 ヘイス゛ 値 平行光線透過率 屈折率 輝度(cd/m2) 実施例１ ＰＰ １．３ ９０％ １．４５ ７８４ 実施例２ ＰＰ １．３ ９０％ １．４５ ８２０ 比較例１ ＰＰ ２．０ ９１％ １．４６ ６７２ 比較例２ ＰＰ ３．１ ９０％ １．４７ ６７２ 比較例３ ＰＰ ３．８ ９０％ １．４７ ６７３ 比較例４ ＰＰ ７．４ ８６％ １．５０ ６５２ 比較例５ アクリル ０．２ ９３％ １．５８ ５７４ 比較例６ ＴＡＣ ０．３ ９２％ １．５６ ６４０ 比較例７ ＰＣ ０．７ ９０％ １．５８ ７００ 比較例８ ＰＥＴ １．２ ８９％ １．５５ ７０３Table 1 (Using polyacrylic acid ester beads having a particle size of about 15 μm (however, in Example 2, using polymethacrylic acid ester beads having a particle size of about 30 μm)) Film type Haze value Parallel light transmittance Refractive index Luminance ( cd / m 2 ) Example 1 PP 1.3 90% 1.45 784 Example 2 PP 1.3 90% 1.45 820 Comparative Example 1 PP 2.0 91% 1.46 672 Comparative Example 2 PP 3. 1 90% 1.47 672 Comparative Example 3 PP 3.8 90% 1.47 673 Comparative Example 4 PP 7.4 86% 1.50 652 Comparative Example 5 Acrylic 0.2 93% 1.58 574 Comparative Example 6 TAC 0.3 92% 1.56 640 Comparative Example 7 PC 0.7 90% 1.58 700 Comparative Example 8 PET 1.2 89% 1.55 703
【００２３】[0023]
【発明の効果】本発明は上記のように構成したから、表
１からも明らかなように、例えば比較例中で最も輝度が
高い比較例８に示されるＰＥＴフイルムを使用したもの
に比べて、実施例１に示されるものは約１２％も輝度が
高く、実用にも充分に耐えることができる非常に有益な
輝度の高い光拡散フイルムである。Since the present invention is constituted as described above, as is clear from Table 1, for example, as compared with the one using the PET film shown in Comparative Example 8 having the highest brightness among Comparative Examples, What is shown in Example 1 is a light diffusion film having a high brightness of about 12%, which is very useful and can withstand practical use.
Claims (2)
％以上の透明ポリプロピレンフイルムの表面に、ビーズ
を分散した樹脂層を形成したことを特徴とする光拡散フ
イルム。1. A parallel light transmittance of 90 at a haze value of 1.3 or less.
% Of a transparent polypropylene film, a resin layer in which beads are dispersed is formed on the surface of the light diffusion film.
％以上の厚さ７５〜２００μｍの透明ポリプロピレンフ
イルムの表面に、ビーズを分散した樹脂層を形成したこ
とを特徴とする光拡散フイルム。2. A parallel light transmittance of 90 at a haze value of 1.3 or less.
% Or more, a light diffusion film having a resin layer in which beads are dispersed is formed on the surface of a transparent polypropylene film having a thickness of 75 to 200 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4494595A JPH08220310A (en) | 1995-02-08 | 1995-02-08 | Light diffusing film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4494595A JPH08220310A (en) | 1995-02-08 | 1995-02-08 | Light diffusing film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08220310A true JPH08220310A (en) | 1996-08-30 |
Family
ID=12705631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4494595A Pending JPH08220310A (en) | 1995-02-08 | 1995-02-08 | Light diffusing film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08220310A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000046617A1 (en) * | 1999-02-05 | 2000-08-10 | Fuji Photo Film Co., Ltd. | Matlike high-transmittance film |
| KR100429098B1 (en) * | 1998-12-09 | 2004-04-29 | 가부시키가이샤 도모에가와 세이시쇼 | Filler lens and its manufacturing method |
| KR100476067B1 (en) * | 1999-12-02 | 2005-03-10 | 에스케이씨 주식회사 | Light-Diffusing Film |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0667003A (en) * | 1992-08-20 | 1994-03-11 | Fuji Photo Film Co Ltd | Light diffusion plate |
| JPH078802B2 (en) * | 1992-02-12 | 1995-02-01 | 義人 長谷川 | Ringworm treatment |
-
1995
- 1995-02-08 JP JP4494595A patent/JPH08220310A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH078802B2 (en) * | 1992-02-12 | 1995-02-01 | 義人 長谷川 | Ringworm treatment |
| JPH0667003A (en) * | 1992-08-20 | 1994-03-11 | Fuji Photo Film Co Ltd | Light diffusion plate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100429098B1 (en) * | 1998-12-09 | 2004-04-29 | 가부시키가이샤 도모에가와 세이시쇼 | Filler lens and its manufacturing method |
| WO2000046617A1 (en) * | 1999-02-05 | 2000-08-10 | Fuji Photo Film Co., Ltd. | Matlike high-transmittance film |
| US7063872B1 (en) | 1999-02-05 | 2006-06-20 | Fuji Photo Co., Ltd. | Films having a high transmittance and matt property |
| KR100737229B1 (en) * | 1999-02-05 | 2007-07-09 | 후지필름 홀딩스 가부시끼가이샤 | Matte high transmittance film, polarizing plate and liquid crystal display using the same |
| KR100476067B1 (en) * | 1999-12-02 | 2005-03-10 | 에스케이씨 주식회사 | Light-Diffusing Film |
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