JPH0545507A - Film for decoration - Google Patents
Film for decorationInfo
- Publication number
- JPH0545507A JPH0545507A JP20039291A JP20039291A JPH0545507A JP H0545507 A JPH0545507 A JP H0545507A JP 20039291 A JP20039291 A JP 20039291A JP 20039291 A JP20039291 A JP 20039291A JP H0545507 A JPH0545507 A JP H0545507A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- glass globules
- film
- globules
- support
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、装飾用フィルムに関
し、更に詳しくは、一定の照射光下、見る角度により色
調が変化するとともに、虹色の分散スペクトル状に美麗
に輝いてみえ、かつ、特定範囲の入射角で入射する照射
光に対しては再帰性反射性能をも有する、看板、交通安
全用器具等の用途に適した装飾用フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative film, more specifically, the color tone changes depending on the viewing angle under a constant irradiation light, and the rainbow-colored dispersion spectrum looks beautiful and shines. The present invention relates to a decorative film suitable for applications such as signboards and traffic safety devices, which also has retroreflective performance with respect to irradiation light incident at an incident angle within a specific range.
【０００２】[0002]
【従来の技術】従来の、この種のフィルムとしては、図
４に示すような、ガラス小球２と光反射層３との間に透
明な焦点整合層９を有する再帰性反射シートが知られて
いる。また、装飾フィルムではないが、光反射器とし
て、屈折率が２．０以上の高屈折率ガラス小球を用い、
かつ、ガラス小球の固着バインダーに埋没した球面に直
接反射層を設けたものが知られている(特開昭６１−１
８６９０２号公報)。2. Description of the Related Art As a conventional film of this type, a retroreflective sheet having a transparent focusing layer 9 between a glass prill 2 and a light reflecting layer 3 as shown in FIG. 4 is known. ing. Although not a decorative film, a high refractive index glass prill with a refractive index of 2.0 or more is used as a light reflector.
Further, there is known one in which a reflective layer is directly provided on a spherical surface of a glass sphere embedded in a fixed binder (Japanese Patent Laid-Open No. 61-161).
86902 publication).
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述の
再帰性反射シートは、照射光線が照射光線と同一方向に
反射され、光源近傍の看者に対してのみ輝いて見えるに
すぎず、色が変化することがなく、交通標識等の用途に
は適しているが、看板等の用途には美感の点で不十分で
あった。また、前述の光反射器は、玉虫色の色調を実現
するためには、いわゆるオープンタイプとしなければな
らず、従って表面保護層を設けることができないので耐
候性に問題があった。しかも、玉虫色の色調といっても
単なる拡散性反射によるものにすぎず、再帰性反射性能
を有していないために、夜間における交通安全の用途に
は使用することができなかった。However, in the above-mentioned retroreflective sheet, the irradiating light beam is reflected in the same direction as the irradiating light beam, and only the viewer near the light source looks shining, and the color changes. Therefore, it is suitable for use as a traffic sign and the like, but was not sufficient for use as a signboard in terms of aesthetics. Further, the above-mentioned light reflector has to be a so-called open type in order to realize an iridescent color tone, and therefore, a surface protective layer cannot be provided, so that there is a problem in weather resistance. Moreover, the iridescent color tone is merely due to diffuse reflection and has no retroreflective performance, so that it cannot be used for traffic safety at night.
【０００４】本発明は上述の従来技術の問題点に鑑みな
されたものであり、 １) 一定の照射光下、見る角度によって色調が変化する
とともに、虹色の分散スペクトル状に美麗に輝いてみえ
ること、 ２) 特定範囲の入射角で入射する照射光に対して、再帰
性反射性能を有すること、 ３) 耐候性に優れていること、 のいずれをも満足する装飾用フィルムを提供することを
目的とする。The present invention has been made in view of the above-mentioned problems of the prior art. 1) Under a constant irradiation light, the color tone changes depending on the viewing angle, and the rainbow-colored dispersion spectrum looks beautiful. To provide a decorative film satisfying all of 2) having retroreflective properties with respect to irradiation light incident at an incident angle within a specific range, and 3) having excellent weather resistance. To aim.
【０００５】[0005]
【課題を解決するための手段】上記目的は、本発明の装
飾用フィルム、即ち、支持体、固着バインダーによって
支持体に保持されたガラス小球、および支持体とガラス
小球との間に設けられており、ガラス小球を透過した光
線を反射する反射薄膜を有する装飾フィルムにおいて、
該ガラス小球は、粒径が５００μm以下、屈折率が２．
０以上、かつ固着バインダーへの埋没率がガラス小球の
粒径の１０〜８０％であり、該反射薄膜は、支持体上に
蒸着によって設けられた金属薄膜であり、ガラス小球の
粒径の５０％以下の深さを持ったガラス小球と同心楕円
状の窪みを有し、該窪みにおいてガラス小球と接触して
おり、さらに、ガラス小球の露出した側(表側)に透明保
護層を積層してなることを特徴とする装飾用フィルムに
よって達成される。The above object is to provide a decorative film of the present invention, that is, a support, glass globules held on the support by a fixed binder, and between the support and the glass globules. In the decorative film having a reflective thin film that reflects light rays that have passed through the glass spheres,
The glass spheres have a particle size of 500 μm or less and a refractive index of 2.
0 or more, and the embedding rate in the fixed binder is 10 to 80% of the particle size of the glass small spheres, and the reflective thin film is a metal thin film provided on the support by vapor deposition. Has a concentric ellipsoidal recess with a glass small sphere having a depth of 50% or less, and is in contact with the glass small sphere in the dent, and the transparent protection is provided on the exposed side (front side) of the glass small sphere. It is achieved by a decorative film, which is formed by laminating layers.
【０００６】装飾用フィルムを他の材料に貼着しやすく
するために、支持体のガラス小球を保持した側の反対側
(裏側)に、さらに粘着剤層および剥離材層をこの順に積
層してもよい。In order to make it easier to attach the decorative film to another material, the side of the support opposite to the side holding the glass prills
On the (back side), an adhesive layer and a release material layer may be further laminated in this order.
【０００７】本発明に係る装飾フィルムに使用する小球
としては、粒径が５００μm以下、例えば３０〜１５０
μmのものが望ましく、特に５０〜１００μmのものが望
ましい。ガラス小球の粒径が３０μmより小さいと虹色
の分散スペクトル効果が小さくなり、一方１５０μmよ
り大きいと効果に比して、コスト高となる。The small spheres used in the decorative film according to the present invention have a particle size of 500 μm or less, for example, 30 to 150.
The one having a thickness of μm is preferable, and the one having a thickness of 50 to 100 μm is particularly preferable. If the particle size of the glass spheres is smaller than 30 μm, the iridescent dispersion spectrum effect becomes small, while if it is larger than 150 μm, the cost becomes higher than the effect.
【０００８】ガラス小球の屈折率は、２．０以上である
必要があり、２．０より小さいと虹色の分散スペクトル
効果が小さくなり、かつ、再帰性反射性能が低下する。The refractive index of the glass spheres needs to be 2.0 or more, and if it is less than 2.0, the iridescent dispersion spectrum effect becomes small and the retroreflective performance deteriorates.
【０００９】ガラス小球の固着バインダーへの埋没率
は、ガラス小球の粒径の１０〜８０％である必要があ
り、５０％前後(例えば４５〜５５％)が、ガラス小球の
固着性能上および当該フィルムの製造技術上望ましい。The embedding rate of the glass globules in the fixing binder must be 10 to 80% of the particle size of the glass globules, and about 50% (for example, 45 to 55%) is the fixing performance of the glass globules. Above, and desirable from the manufacturing technology of the film.
【００１０】固着バインダーとしては、アクリル樹脂、
ビニルブチラール樹脂、アルキド樹脂、ウレタン樹脂
等、透明性を有する樹脂が使用され、中でもアクリル樹
脂、ビニルブチラール樹脂等が、透明性が高いという理
由から特に望ましい。As the fixing binder, acrylic resin,
A resin having transparency such as vinyl butyral resin, alkyd resin and urethane resin is used, and among them, acrylic resin, vinyl butyral resin and the like are particularly preferable because of high transparency.
【００１１】反射薄膜としては、アルミニウム、クロ
ム、銅、スズ、銀、金等の金属単体およびその化合物や
合金が使用され、中でもアルミニウムが、反射効率、経
済性の面から特に望ましい。反射薄膜の厚みは、少なく
とも２００オングストロームあることが反射性能上望ま
しい。As the reflective thin film, simple metals such as aluminum, chromium, copper, tin, silver and gold and their compounds and alloys are used. Among them, aluminum is particularly desirable in terms of reflection efficiency and economy. It is desirable that the thickness of the reflective thin film is at least 200 angstroms in terms of reflective performance.
【００１２】反射薄膜に形成されるガラス小球と同心楕
円状の窪みは、ガラス小球の粒径の５０％以下の深さを
持っていることが必要であり、特に２〜２０％が望まし
い。２％より浅いと、虹色の分散スペクトル効果が小さ
くなり、２０％より深いと再帰性反射性能が低下する。The concentric oval recesses formed on the reflective thin film should have a depth of 50% or less of the particle size of the glass spheres, preferably 2 to 20%. .. If it is less than 2%, the iridescent dispersion spectrum effect will be small, and if it is more than 20%, the retroreflective performance will be deteriorated.
【００１３】透明保護層としては、アクリル樹脂、フッ
素樹脂、アルキド樹脂、ウレタン樹脂、オレフィン系樹
脂等が使用され、中でもアクリル樹脂、アルキド樹脂等
が、耐候性の面から特に望ましい。As the transparent protective layer, acrylic resin, fluororesin, alkyd resin, urethane resin, olefin resin and the like are used, and among them, acrylic resin and alkyd resin are particularly preferable from the viewpoint of weather resistance.
【００１４】支持体としては、エポキシ樹脂、ウレタン
樹脂、ポリエステル樹脂、アクリル樹脂等が使用され、
中でもエポキシ樹脂、ウレタン樹脂等が、金属との密着
性および柔軟性の面から特に望ましい。As the support, epoxy resin, urethane resin, polyester resin, acrylic resin, etc. are used.
Among them, epoxy resin, urethane resin and the like are particularly desirable in terms of adhesion to metal and flexibility.
【００１５】[0015]
【作用】本発明に係る装飾フィルムが、一定の照射光
下、見る角度によって色調が変化するとともに、虹色の
分散スペクトル状に美麗に輝いてみえ、かつ、特定範囲
の入射角で入射する照射光に対しては再帰性反射性能を
も有する理由を、添付図面を参照して説明する。The irradiation of the decorative film according to the present invention is such that the color tone changes under a constant irradiation light depending on the viewing angle, and it shines beautifully in the dispersed spectrum of rainbow colors and is incident at a specific incident angle. The reason why it also has retroreflective performance for light will be described with reference to the accompanying drawings.
【００１６】図２に示すように、装飾フィルム面に対し
３０〜８０度の角度で入射する照射光は、透明な保護層
６、高屈折率のガラス小球２および固着バインダー１
(図１参照)中を屈折しながら透過し、ガラス小球に接触
していない反射薄膜の窪みの定点で反射し、さらに、固
着バインダー、高屈折率ガラス小球および保護層を逆に
屈折しながら看者の視覚に到達する。これは再帰性反射
の原理に基づくものである。As shown in FIG. 2, the irradiation light incident on the surface of the decorative film at an angle of 30 to 80 degrees, the transparent protective layer 6, the glass spheres 2 having a high refractive index, and the fixed binder 1.
(Refer to Fig. 1) The light passes through while refracting, and is reflected at a fixed point of the recess of the reflective thin film that is not in contact with the glass sphere, and further, the fixed binder, the high-refractive-index glass sphere and the protective layer are reversely refracted. While reaching the viewer's vision. This is based on the principle of retroreflection.
【００１７】また、図３に示すように、ガラス小球に接
触している反射薄膜の窪みの定点において反射した照射
光は分光し、分散スペクトルを発生するため、虹色に輝
くように見えることになる。Further, as shown in FIG. 3, the irradiation light reflected at the fixed point of the depression of the reflective thin film which is in contact with the glass small spheres is dispersed and generates a dispersion spectrum, so that it looks like a rainbow color. become.
【００１８】[0018]
【実施例】以下、添付の図１を参照して本発明に係る装
飾用フィルムを詳細に説明する。実施例１ 厚さ５０μmのポリエステルフィルムの上に、支持体５
として１０〜１５μmの乾燥厚みになるようにエポキシ
樹脂を塗布し、その上に厚さ約５００オングストローム
のアルミニウム薄層を蒸着して反射薄膜３を形成した。
その上面に固着バインダー１としてビニルブチラール樹
脂を、厚みが３０〜４０μmとなるように塗布し、半乾
燥の状態で屈折率２．２５、粒径５０〜１００μmのガ
ラス小球２を均一に５０％の埋没率で埋没させた。The decorative film according to the present invention will be described in detail below with reference to the accompanying FIG. Example 1 A support 5 was placed on a polyester film having a thickness of 50 μm.
As a result, an epoxy resin was applied so as to have a dry thickness of 10 to 15 μm, and a thin aluminum layer having a thickness of about 500 angstrom was vapor-deposited thereon to form a reflective thin film 3.
Vinyl butyral resin is applied to the upper surface as a fixed binder 1 so that the thickness is 30 to 40 μm, and 50% of glass globules 2 having a refractive index of 2.25 and a particle size of 50 to 100 μm are uniformly in a semi-dried state. It was buried at the buried rate of.
【００１９】さらに、その上に、透明保護層６として７
５μmの厚さのアクリル樹脂フィルムを熱融着により積
層した。その際、３kg／cm2の圧力を加えることによっ
てガラス小球と接触する部分の反射薄膜を押圧し、反射
薄膜にガラス小球と同心楕円状であって、幅が６０〜１
２０μm、深さが５〜１０μmの窪み４を形成させた。Furthermore, a transparent protective layer 6 is formed on top of it.
An acrylic resin film having a thickness of 5 μm was laminated by heat fusion. At that time, a pressure of 3 kg / cm 2 is applied to press the reflection thin film in a portion in contact with the glass small sphere, and the reflection thin film is concentric oval with the glass small sphere and has a width of 60 to 1
The depression 4 having a thickness of 20 μm and a depth of 5 to 10 μm was formed.
【００２０】次に、前記ポリエステルフィルムを剥離
し、該剥離面にアクリル系粘着剤７と剥離材８とを積層
して装飾用フィルムを作成した。Next, the polyester film was peeled off, and the acrylic adhesive 7 and the peeling material 8 were laminated on the peeled surface to prepare a decorative film.
【００２１】実施例２ 厚さ５０μmのポリエステルフィルムの上に、支持体５
として１０〜１５μmの乾燥厚みとなるようにウレタン
樹脂を塗布し、その上に厚さ約５００オングストローム
のアルミニウム薄層を蒸着して反射薄膜３を形成した。
その上面に固着バインダー１としてアクリル樹脂を、厚
みが３０〜４０μmとなるように塗布し、半乾燥の状態
で屈折率２．２５、粒径５０〜１００μmのガラス小球
２を均一に５０％の埋没率で埋没させた。 Example 2 A support 5 was placed on a polyester film having a thickness of 50 μm.
As a result, urethane resin was applied so as to have a dry thickness of 10 to 15 μm, and a thin aluminum layer having a thickness of about 500 angstrom was vapor-deposited thereon to form the reflective thin film 3.
Acrylic resin as a fixed binder 1 is applied on the upper surface so that the thickness becomes 30 to 40 μm, and in a semi-dried state, glass globules 2 having a refractive index of 2.25 and a particle size of 50 to 100 μm are uniformly 50%. It was buried at the buried rate.
【００２２】その上に、透明保護層６として５０μの厚
さのコロナ処理されたフッ素樹脂フィルムを熱融着によ
り積層した。その際、３kg／cm2の圧力を加えることに
よって、ガラス小球と接触する部分の反射薄膜を押圧
し、反射薄膜に、ガラス小球と同心楕円状であって、幅
が６０〜１２０μm、深さが５〜１０μmの窪み４を形成
させた。A corona-treated fluororesin film having a thickness of 50 μm was laminated as a transparent protective layer 6 thereon by heat fusion. At that time, by applying a pressure of 3 kg / cm 2 , the reflective thin film in the portion in contact with the glass small sphere is pressed, and the reflective thin film is concentric oval with the glass small sphere and has a width of 60 to 120 μm and a deep depth. A recess 4 having a size of 5 to 10 μm was formed.
【００２３】次に、前記ポリエステルフィルムを剥離
し、該剥離面上にアクリル系樹脂粘着剤７と剥離材８と
を積層して装飾用フィルムを形成した。Next, the polyester film was peeled off, and the acrylic resin adhesive 7 and the peeling material 8 were laminated on the peeled surface to form a decorative film.
【００２４】[0024]
【発明の効果】以上説明したように、本発明に係る装飾
用フィルムは一定の照射光下、見る角度によって色調が
変化するとともに、虹色の分散スペクトル状に美麗に輝
いてみえるので、各種看板、建築物の内装、外装、さら
に、自動車用品の装飾などに使用した場合、その外観
に、これまでの装飾フィルムでは得られなかった深みの
ある立体感を付与することができる。特に円筒状等の曲
面を有する看板等にその効果は顕著に発揮される。As described above, since the decorative film according to the present invention changes its color tone depending on the viewing angle under a constant irradiation light and looks beautifully like a rainbow-colored dispersed spectrum, it can be used for various signboards. When it is used for the interior and exterior of a building, or for decoration of automobile parts, it can give the appearance a deep three-dimensional effect that has not been obtained by the conventional decorative films. In particular, the effect is remarkably exerted on a signboard having a curved surface such as a cylindrical shape.
【００２５】また、特定範囲の入射角で入射した照射光
に対しては、再帰性反射性能をも有するため夜間におけ
る交通安全の用途にも単独で使用することができるとと
もに、昼間は色調が変化し美麗に見え、かつ、夜間は視
認性が向上するという異なった機能を有する看板等とし
て使用することもできる。この場合も、円筒状等の曲面
を有する看板等に使用するならば、あらゆる入射角度に
対して再帰性反射を実現することができ、顕著な効果を
発揮する。Further, since it also has a retroreflective performance with respect to irradiation light incident at a specific range of incident angles, it can be used alone for traffic safety applications at night, and the color tone changes during the daytime. It can also be used as a signboard that has a different function of looking beautiful and improving visibility at night. Also in this case, if it is used for a signboard or the like having a curved surface such as a cylindrical shape, retroreflection can be realized for any incident angle, and a remarkable effect is exhibited.
【００２６】さらに、透明保護層を有するため、優れた
耐候性を合わせ持つという効果を発揮する。Further, since it has a transparent protective layer, it has an effect of having excellent weather resistance as well.
【図１】 本発明に係る装飾用フィルムの一実施例の概
略断面図。FIG. 1 is a schematic sectional view of an embodiment of a decorative film according to the present invention.
【図２】 本発明に係る装飾用フィルムの作用(入射光
線の屈折および反射光路)を説明する概略説明図。FIG. 2 is a schematic explanatory view for explaining the action (refraction of incident light and reflected light path) of the decorative film according to the present invention.
【図３】 本発明に係る装飾用フィルムの作用(入射光
線の屈折および反射光路)を説明する概略説明図。FIG. 3 is a schematic explanatory view illustrating the action (refraction of incident light rays and reflected light path) of the decorative film according to the present invention.
【図４】 従来の装飾用フィルムの概略断面図。FIG. 4 is a schematic sectional view of a conventional decorative film.
１: 固着バインダー ２: ガラス小球 ３: 反射薄膜 ４: 窪み ５: 支持体 ６: 透明保護層 ７: 粘着剤 ８: 剥離材 ９: 焦点整合層 1: Adhesive binder 2: Glass sphere 3: Reflective thin film 4: Indentation 5: Support 6: Transparent protective layer 7: Adhesive 8: Release material 9: Focusing layer
Claims (2)
に保持されたガラス小球、および支持体とガラス小球と
の間に設けられており、ガラス小球を透過した光線を反
射する反射薄膜を有する装飾フィルムにおいて、該ガラ
ス小球は、粒径が５００μm以下、屈折率が２．０以
上、かつ固着バインダーへの埋没率がガラス小球の粒径
の１０〜８０％であり、該反射薄膜は、支持体上に蒸着
によって設けられた金属薄膜であり、ガラス小球の粒径
の５０％以下の深さを持ったガラス小球と同心楕円状の
窪みを有し、該窪みにおいてガラス小球と接触してお
り、さらに、ガラス小球の露出した側(表側)に透明保護
層を積層してなることを特徴とする装飾用フィルム。1. A support, glass globules held to the support by a fixed binder, and a reflective thin film provided between the support and the glass globules for reflecting light rays that have passed through the glass spheres. In the decorative film, the glass microspheres have a particle size of 500 μm or less, a refractive index of 2.0 or more, and an embedding rate in a fixed binder of 10 to 80% of the particle size of the glass microspheres. Is a metal thin film provided on the support by vapor deposition and has a concentric ellipsoidal recess with a glass small sphere having a depth of 50% or less of the particle size of the glass small sphere. A decorative film, which is in contact with a sphere and is further laminated with a transparent protective layer on the exposed side (front side) of the glass sphere.
側(裏側)に、粘着剤層および剥離材層を、この順に積層
してなる請求項１記載の装飾用フィルム。2. The decorative film according to claim 1, wherein a pressure-sensitive adhesive layer and a release material layer are laminated in this order on the opposite side (back side) of the support that holds the glass globules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3200392A JP2988751B2 (en) | 1991-08-09 | 1991-08-09 | Decorative film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3200392A JP2988751B2 (en) | 1991-08-09 | 1991-08-09 | Decorative film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0545507A true JPH0545507A (en) | 1993-02-23 |
| JP2988751B2 JP2988751B2 (en) | 1999-12-13 |
Family
ID=16423567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3200392A Expired - Lifetime JP2988751B2 (en) | 1991-08-09 | 1991-08-09 | Decorative film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2988751B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5962121A (en) * | 1996-12-12 | 1999-10-05 | 3M Innovative Properties Company | Retroreflective sheet comprising microspheres, the diameter and refractive index of which being specifically related to the refractive indices of layers directly in contact therewith |
| JP2002055215A (en) * | 2000-08-09 | 2002-02-20 | Haruki Yamada | Retroreflective sheet and method for manufacturing the same |
| KR100591779B1 (en) * | 2003-03-31 | 2006-06-23 | 황건이 | A reflection sheet |
| US7193631B2 (en) | 1996-06-14 | 2007-03-20 | 3M Innovative Properties Company | Display unit and methods of displaying an image |
| JP2007517265A (en) * | 2003-12-30 | 2007-06-28 | スリーエム イノベイティブ プロパティズ カンパニー | Color-shifting retroreflector and method for manufacturing the same |
| US7303292B2 (en) | 2004-04-28 | 2007-12-04 | Kiwa Chemical Industry Co., Ltd. | Hue variable retroreflective sheet |
| JP2019033027A (en) * | 2017-08-09 | 2019-02-28 | 藤木 淳 | Color display module and three-dimensional structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170065591A (en) | 2014-09-30 | 2017-06-13 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Retroreflective colored articles |
| CN109311265A (en) | 2016-03-30 | 2019-02-05 | 3M创新有限公司 | Product and preparation method thereof characterized by the predetermined pattern of the microballoon of random distribution |
-
1991
- 1991-08-09 JP JP3200392A patent/JP2988751B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7193631B2 (en) | 1996-06-14 | 2007-03-20 | 3M Innovative Properties Company | Display unit and methods of displaying an image |
| US7791562B2 (en) | 1996-06-14 | 2010-09-07 | 3M Innovative Properties Company | Display unit and methods of displaying an image |
| US5962121A (en) * | 1996-12-12 | 1999-10-05 | 3M Innovative Properties Company | Retroreflective sheet comprising microspheres, the diameter and refractive index of which being specifically related to the refractive indices of layers directly in contact therewith |
| JP2002055215A (en) * | 2000-08-09 | 2002-02-20 | Haruki Yamada | Retroreflective sheet and method for manufacturing the same |
| KR100591779B1 (en) * | 2003-03-31 | 2006-06-23 | 황건이 | A reflection sheet |
| JP2007517265A (en) * | 2003-12-30 | 2007-06-28 | スリーエム イノベイティブ プロパティズ カンパニー | Color-shifting retroreflector and method for manufacturing the same |
| JP4787173B2 (en) * | 2003-12-30 | 2011-10-05 | スリーエム イノベイティブ プロパティズ カンパニー | Color-shifting retroreflector and method for manufacturing the same |
| US7303292B2 (en) | 2004-04-28 | 2007-12-04 | Kiwa Chemical Industry Co., Ltd. | Hue variable retroreflective sheet |
| JP2019033027A (en) * | 2017-08-09 | 2019-02-28 | 藤木 淳 | Color display module and three-dimensional structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2988751B2 (en) | 1999-12-13 |
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