KR20000049080A - Optical diffuser plates - Google Patents

Abstract

PURPOSE: A transparent plastic is provided to enhance the illumination in the space by using an intensity of lightness of the day. CONSTITUTION: Optical diffuser plates (1) are made of transparent plastics such as polycarbonate or polymethacrylate. Several thin strips (2) made of plastic B are inserted into plates made of transparent plastic A with the proviso that A and B are incompatible and the strips (2) made of plastic B are subsequently withdrawn. The hollows that are formed in the plate (1) made of plastic A are used to deflect light.

Description

Optical diffuser plates

One of the top priorities in the field of technical science is energy conservation or resource conservation, which has led to related research, namely the saving of underground resources and the reduction of electric energy use.

The present invention relates to a light guide plate made of a transparent plastic, which has been used to improve the brightness of a space by utilizing the brightness of the day.

1 shows a typical interior space.

2 is a view showing the installation of a transparent body in one part of the window according to the aspect of the present invention in the space shown in FIG.

3 shows the insertion of several thin bands of plastic B into a plate made of plastic A;

4 shows that light is directed according to each situation.

The problem of relatively brightening a dark room with daylight cannot be adequately addressed in the back space or away from the window, especially when daylight is inclined (see Fig. 1). This situation means that the subspace of the room must always have artificial lighting, for example electric lighting, even during the day, which is disadvantageous in terms of energy conservation and social environment. FIG. 1 shows a typical interior space, and the following reference mark is shown for this FIG.

S = slope of daylight H = relatively bright area

F = window D = relatively dark area

T = statement

The above-described invention is to take action and to replace the so-called photoconductor for solving the problem. This photoinductor collects daylight-over the glass pane and refracts it into the dark of the space or against the ceiling (FIG. 2). Thus, the transmission refracts deeply into the room the daylight coming in obliquely from the outside. Figure 2 is a view showing that the permeable body is installed in one part of the window in the aspect of the invention in the space shown in FIG. This reference sign LLP means a light guide plate. The remaining reference marks are as shown in FIG. In order to obtain the desired refraction, the light guide plate LLP has the following configuration. Plastic B is considered, for example, as the plastics described below.

Fluoropolymers such as thermoplastic fluoropolymers

Polypropylene type, for example Luporene form of BASF Corporation

Polyethylene type

Polyamide type, for example, Vestamid type from Wheels

Two kinds of unique properties of light induction effect is achieved. The separating surface of the material or the passage of the material can only be observed with a difference in refractive index or very clearly as a reflecting surface in the case where the separation gap of sunlight is formed. Plastic B bands produced by injection molding can be easily found on composite A plastic plates while the plastic A plates are cooled or after cooling. This can be done manually or through some winding device. The bands of plastic B are perpendicular to the face of the plate or arranged at an angle γ <90 ^o with respect to the face of the plate. The light beam already passes above the LLP of the kind described above, and the law of total reflection is applied at the boundary layer between plastic A and the air gap, and the limit angle α _G of the total reflection depends solely on the refractive index of both plastics.

If plastic B is synthesized in plastic A and there is a gap between the bands and the matrix supporting the band, the following rules apply:

In other words, total reflection occurs when the light ray passes the boundary layer at an angle α _E smaller than the angle α _G (I in FIG. 4). This inclined ray is refracted above or above the plane. The refractive index reaches a maximum difference by replacing the plastic bands of plastic B described in DE 195 43 687 with plastic A having a different refractive index with respect to air. In the case of the angle α _E larger than the angle α _G (case II in FIG. 4), the incoming light beam penetrates the boundary surface. Since the LLP is an injection molding plate inserted into the thin bands of the plate, it is preferentially injection molding, permeable, and selected as a thermoplastic resin having a contradictory property with the plastic A plate. . The larger the difference in the refractive indices, the greater the boundary angle α _G and the system efficiency. The high system efficiency due to the small angle α _G is achieved by the inclination angle γ <90 ^o of the plastic band. Due to the inclination angle of this band, the input angle of light decreases to the interface α _E value (case II in FIG. 4). As plastic A, for example polymethyl methacrylate (PMMA and copolymerite) or polycarbonite (PC) and as polymer B the polymers already mentioned above are used. In the test for the production of the light guide plate, that is, the light induction effect was not expected in the test as described above. In the case of plastic B of impurity with plastic A, ie when a thin band of plastic B is not bonded at all with the matrix, ie with plastic A, and when the band is separated from the plastic A through a thin gap, the induction efficiency of light Will increase. Separation from the plastic bands from matrix polymer A to plastic B is optically recognizable: this plastic band has a single reflective surface, which produces a pronounced total reflection depending on the band occurring at the surface of the thin gap. The refractive index between the air and the matrix of plastic B is very different from the matrix of plastic B and plastic A and the refractive index generated according to the above-described formula, that is, high total reflection. It has not been determined so far whether the gap will initially be filled with air, or whether it will be a lot or less or a vacuum. It is then assumed that after plastic B is synthesized in plastic A, the gap fills air through plastic A over time as the air diffuses back. The separation of plastics A and B is well done by the difference in coefficient of linear expansion and when cooling the injection molding. At the same time, the band disappears faster than the matrix because plastic B has a higher coefficient of thermal expansion than plastic A. The difference in the microlinear expansion coefficient, that is, the difference in the microlinear expansion coefficient of 0.001% or less, is an inventive factor. In the case of the formation of the separation gap between plastics A and B, it is not important that both plastics have a difference in refractive index and in the above-described contents, and it is advantageous that plastic A has a higher refractive index than plastic B but small. The total reflection resulting from the formation of this split point is always sufficient to produce an intense light induction effect. The width of the separation gap must be greater than 1 μm.

The thickness of the light guide plate LLP is generally in the range of 2 and 20 mm. The inserted and especially injection molded bands made of plastic B have a thickness of 0.05 to 0.5 mm and have a functional relationship with the thickness of the plate made of plastic A from 50 to 95% of the width. In general, bands made of plastic B are arranged on plastic sheet A at regular intervals of 2 to 40 mm to face each other. The dimensional design of the remaining light guide plate LLPs was tailored to the installation window, in particular the shape of the window or the door frame. There is generally no limit to the design dimensions of the injection molding technique. The production technology using injection molding in injection molding machines with multi-material injection holes is based on technical background (DE-A 4 326 232). The light guide plate LLP in this aspect of the invention is described according to FIG. 3. At the same time, the reference sign means:

(1) = light guide plate LLP of plastic A

(2) = inserted thin bands of plastic B

(3) = communities created through plastic pull

(4) = communities

In order to fix the light guide plate according to the invention, a known plate or a fixing frame for glass windows is used.

The light guide plate according to this invention can be installed for successfully improved lighting in spaces, factories, auditoriums, basements, domed ceilings, vertical shafts, optionally cars or ships, and the like. Its application not only contributes to energy savings but also contributes to achieving better biological conditions in the workplace.

Claims (13)

The refractive stream n number of thin bands of a plastic B having a refractive index n _B in the as plastic A of the transparent plate with _A is inserted, the plastics A and the plastic B are in different materials, and have been of the plastic B band plate A light guide plate made of transparent plastic, characterized in that disappears from. 2. The light guide plate of claim 1 wherein the bands of plastic B are arranged perpendicular to the plate surface. The light guide plate of claim 1 wherein the bands of plastic B are arranged at an angle γ <90 ^° or less relative to the surface of the plate. The light guide plate according to any one of claims 1 to 3, wherein the plastics A and B are made of thermoplastic plastics. The light guide plate according to any one of claims 1 to 4, wherein the light guide plate is produced by a process of both injection molding. The light guide plate according to any one of claims 1 to 5, having a thickness in the range of 2 to 30 mm. The light guide plate according to any one of claims 1 to 6, wherein the band-shaped community has a thickness of 0.05 to 0.5 mm. 8. The light guide plate according to any one of claims 1 to 7, wherein the design dimensions are tailored to the type of glass window. A glass window having light guide plates according to any one of the preceding claims. 8. A method of producing a light guide plate according to any one of claims 1 to 7, wherein according to the injection molding, the thin bands made of plastic B disappear from the plate made of plastic A. The light guide plate according to any one of claims 1 to 7, wherein the plastic A is polymer acrylate or polycarbonite. The light guide plate according to any one of claims 1 to 7, wherein the plastic B uses different plastics made of polycarbonite or polymer acrylate. The light guide plate according to any one of claims 1 to 7, wherein the plastic B is made of a fluoropolymer, polypropylene, polyethylene, or polyamide of a thermoplastic plastic.