JPS6155466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet that selectively colors light depending on its direction. The invention also relates to methods of manufacturing these sheets.

When a ray of light is incident on a sheet-like object,
It would be extremely useful to have something that allows the transmitted light to be colored or uncolored depending on the angle, and even if it is colored, it can be colored in various colors. For example, when this is used on window glass, sunlight that enters from a high angle is colored, and the interior is illuminated with colored light, but when looking outside, it can be seen in normal light. do.

Until now, it has been possible to color light rays according to the angle of incidence by using diffraction gratings, liquid crystals, etc. However, these methods are complicated and delicate, and are extremely expensive, so they have only been used for limited purposes.

Therefore, the present inventor conducted extensive research in order to realize a transmitted light colored sheet with such directional selectivity, and divided the colored layer into a combination of fine patterns, each of which was placed on both sides of a transparent substrate. The present invention was conceived based on the idea that the intended effects could be obtained.

The direction-selective transmitted light colored sheet of the present invention has a first coloring pattern provided on one side of a light-transmitting substrate, and a coloring pattern provided on the other side in a negative and positive relationship with respect to the first pattern. , a second colored pattern that does not overlap even when moved in parallel is provided at a corresponding position or a position moved in parallel from the second colored pattern, and the first and second colored layers are separated depending on the incident angle of the light beam. As a result of the patterns corresponding to each other in different positional relationships, the manner and degree of coloring of transmitted light changes.

FIG. 1 is a sectional view showing an example of a direction-selective transmitted light colored sheet of the present invention, in which a first colored layer 3 and a second colored layer 4 are formed on both sides of a substrate 2 made of a transparent material. , are provided at corresponding positions. In other words, the colored layer 3 has a pattern in which a large number of parts that color light and parts that simply transmit light are arranged parallel to each other at equal pitches, and if 3 is negative, the colored layer 4 is positive, and parallel movement They have patterns that do not overlap even if the

Now, looking at the behavior of white light rays incident on this colored sheet 1, the light in the A direction, that is, the direction perpendicular to the sheet, is reflected in the first or second colored layer 3 or 4.
All are colored by one of the following. A part of the slightly tilted light in direction B is transmitted as is, and most of it is colored. If the pitch of the colored pattern is equal to the sheet thickness, the light incident from the C direction, that is, the 45° direction, will be least colored, and the light incident from the tilted D direction will be least colored.
The degree of coloring of the light in the direction becomes higher again. Since the coloring rate of light in the C direction is 50%, this colored sheet has a coloring rate of 50 to 100%, in other words, a non-coloring sheet that varies within the range of 0 to 50%, depending on the incident angle of the light beam. It will have colored transmittance.

When the first colored layer and the second colored layer have the same color, a single coloring is performed at the above-mentioned coloring rate, whereas when the first colored layer and the second colored layer have different colors, the following complex coloring occurs. That is, the white light in the A direction is transmitted through the colored layers 3 and 4 as a 100% side-by-side mixed color of 50% each. Light in direction C is 50%
is colored in a subtractive mixed color by colored layers 3 and 4, and is transmitted along with 50% white light. Light in other directions B and D is colored light by the colored layer 3,
Similarly, the light rays are a mixture of colored light by 4, subtractive mixed color light by 3 and 4, and some white light.

If the substrate 2 is colored in a different color from the colored layers 3 and 4, even more complex changes occur.

The directionally selective transmitted light colored sheet of the present invention may include many other embodiments. In the illustrated example, the first pattern is equally spaced parallel lines;
Therefore, the second pattern is also equi-pitch parallel lines, which are provided at corresponding positions across the board, but they do not have to be equi-pitch, and may also be patterns other than parallel lines, such as a checkered pattern or a polka dot pattern. , and even irregular shapes can be selected arbitrarily. Regarding the mutual position, the second pattern may be slightly shifted in parallel from the corresponding position with the first pattern, and those skilled in the art will be able to appropriately design these points depending on the use of the transmitted light colored sheet. .

The size of the pattern is also arbitrary, and those formed finely are particularly useful. With recent technology, it is possible to precisely draw patterns on the order of microns, and a sheet with such a pattern is equivalent to one with a uniform surface in appearance, so the effect of the present invention is But as if 1
It can also be made to appear as if it could be achieved by a number of homogeneous sheets.

If desired, the directionally selective transmitted light colored sheet of the present invention can have a transparent protective layer laminated on one or both surfaces thereof by coating or other means.

It is also advantageous to apply a layer of adhesive to one or both sides of the sheet and create a product in the form of a release film, for example when this transmitted light colored sheet is applied to a transparent window glass. Will.

In addition, the transmitted light colored sheet of the present invention may have various modifications or additions.

The direction-selective transmitted light colored sheet of the present invention can be used not only as a window glass with an indoor colored light illumination function mentioned above, but also as a window glass with a function of illuminating a room with colored light. There are applications where it is used for lighting instead of colored light, and it can be used in a wide variety of interior and display fields.

Below, a typical manufacturing method of the directionally selective transmitted light colored sheet of the present invention will be explained.

As the material of the substrate, any material such as glass, polyvinyl chloride, cellulose, polyester, nylon, acrylic, polycarbonate, polyolefin, etc. can be used, and the material and thickness are selected depending on the purpose.

After forming a first colored layer on one side of this substrate by patterning using a commonly used technique,
On the other surface, at a position corresponding to the first pattern or a position slightly translated in parallel, a second pattern is placed in a negative and positive relationship with respect to the first pattern, and does not overlap even when moved in parallel. A patterned colored layer is provided.

It is necessary to register the two patterns, and although it is possible to provide a second colored pattern by printing, etc., it is recommended to use back exposure technology as a means of accurately aligning minute patterns. be done.

One of the methods for producing a directionally selective transmitted light colored sheet using back exposure is to first apply a negative color to one side of a transparent substrate 2, as shown in FIG. A light-shielding resist layer 31 for lift-off is provided with a pattern that is in a positive relationship with B and does not overlap even when moved in parallel, and a layer 61 of positive photosensitive resin is applied to the other surface of B. A layer 41 of photosensitive resin with a second pattern is formed by exposing from the side where the pattern is to be provided and developing C to form a layer 41 of photosensitive resin with a second pattern, D dyeing it to form a colored layer 4 of the second pattern, and then E. A first colored layer 32 is laminated on a certain surface of a light-shielding resist layer 31 for lift-off, and F reverse etching is performed to form a first pattern 3.

As the positive photosensitive resin, diazo type resins are suitable.

To dye this photosensitive resin, oil dyes, disperse dyes, cationic dyes, reactive dyes, direct dyes, etc. can be used.

The process shown in FIG. 3 is a method for producing a directionally selective transmitted light colored sheet using a negative photosensitive resin. In this method, a light-shielding resist layer 31 for lift-off is formed on one side of the transparent substrate 2, and has a pattern that has a negative and positive relationship with the first colored pattern and does not overlap even when moved in parallel.
A layer of negative-type photosensitive resin for lift-off is applied to the other side of B, exposed from the side on which the first pattern is to be provided, and C is developed to form a negative and negative photosensitive resin for the second pattern. The process of forming the photosensitive resin layer 42 having a positive pattern is similar to the manufacturing method described with reference to FIG. A colored layer 43 is laminated and E-reverse etching is performed to form a second colored pattern 4.
The first colored layer 32 is laminated on the F first light-shielding resist layer 31 for lift-off, and the first colored pattern 3 is formed by performing G reverse etching.

Of course, the reverse etching in steps E and G above may be performed in the reverse order or simultaneously.

Examples of negative photosensitive resins include azide rubber-based, cyclized rubber-based, polyvinyl cinnamate-based, cinnamylidene-based, acryloyl-based, unsaturated polyester-based,
There are many types of photosensitive resins known, and one may be selected from them as appropriate.

In any case, in order to create a position where the second pattern is shifted parallel to the first pattern from the corresponding position, the exposure light beam is not perpendicular to the substrate, but is incident on the substrate at an appropriate inclination. Just measure it like this.

Example A 2000 angstrom thick aluminum layer was formed on one surface of a 1 mm thick glass substrate by vapor deposition in a pattern of parallel lines with a width of 1.2 mm and an interval of 1 mm to form a lift-off resist layer.

A vinyl cinnamate-based negative photosensitive resin was applied to the other surface by spin coating, and the substrate was irradiated with ultraviolet rays with an intensity of 110 W/m ² for 30 seconds perpendicularly from the first pattern side. , and developed to obtain a negative-positive pattern.

On the surface of this photosensitive resin, copper was evaporated to a thickness of 500 Å over the entire surface by the evaporation method, and the resin was dissolved in toluene and lifted off to form a colored layer with a second pattern.

Next, gold is layered to a thickness of 50 Å by vapor deposition on the surface of the light-shielding resist layer for lift-off prepared first, and then lift-off is performed only on the first pattern surface with dilute hydrochloric acid to color the first pattern. formed a layer.

This sheet gave a beautifully varied transmitted light, combining red, green and white light in different proportions, depending on the angle of the light beam incident on the substrate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the transmissive colored sheet of the present invention and its direction selectivity. FIGS. 2 and 3 are cross-sectional views for explaining different manufacturing methods of the direction-selective transmitted light colored sheet of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Direction-selective transmitted light colored sheet, 2...Transparent substrate, 3...First colored layer, 4...Second colored layer.

Claims (1)

[Claims] 1. A first colored pattern is provided on one side of a light-transmissive substrate, and a first colored pattern is provided on the other side in a negative and positive relationship with respect to the first colored pattern, and is moved in parallel. A second colored pattern that does not overlap even if
A direction-selective transmitted light colored sheet provided at a corresponding position or a position parallel to the corresponding position. 2. The directionally selective transmitted light colored sheet according to claim 1, wherein the substrate is colored in a color different from the coloring pattern. 3. The directionally selective transmitted light colored sheet according to claim 1, which comprises a transparent protective layer laminated on at least one colored pattern. 4. The directionally selective transmitted light colored sheet according to claim 1, comprising a transparent adhesive layer on at least one surface. 5 A light-shielding resist layer for lift-off is provided on one side of the transparent substrate, and the pattern has a negative and positive relationship with the first colored pattern and does not overlap even when moved in parallel, and a light-shielding resist layer is provided on the other side. A layer of positive photosensitive resin is applied, exposed and developed from the side on which the first pattern is to be provided, and then the resin is dyed to form a colored layer of the second pattern. 1. A method for producing a directionally selective transmitted light colored sheet, which comprises laminating one colored layer and performing reverse etching to form a colored layer with a first pattern. 6. A light-shielding resist layer for lift-off is provided on one side of the transparent substrate, and the pattern has a negative and positive relationship with the first colored pattern and does not overlap even when moved in parallel, and a light-shielding resist layer is provided on the other side. After applying a layer of negative photosensitive resin for lift-off and exposing and developing it from the side where the first pattern is to be provided,
A second colored layer is laminated on that surface, and reverse etching is performed to form a second colored pattern, and a first colored layer is laminated on the first lift-off resist layer, and reverse etching is performed. 1. A method for producing a directionally selective transmitted light colored sheet, the method comprising forming a first colored pattern using a method of producing a directionally selective transmitted light colored sheet.