JPS63220201A - Lens made of transparent plastic vessel - Google Patents

Abstract

PURPOSE:To reduce the cost of the title lens by filling the liq. having a low visible light absorption into a transparent plastic vessel with the light incident surface and/or emitting surface formed by curved surfaces having a required curvature. CONSTITUTION:The liq. 4 having a low visible light absorption is filled into the transparent plastic vessel 1 with the light incident surface 2 and/or emitting surface 3 formed by the curved surfaces having a required curvature. A lens can be formed at a low cost by this method. The diffusibity or convergence for solar light can be optionally set by changing the curvatures of the incident surface 2 and/or emitting surface 3. Furthermore, the light can be diffused and converged only in one direction or in two directions by changing the directions of the incident surface 2 and the emitting surface 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lens for diffusing and converging light beams transmitted in transparent plastic containers used in solar light condensing devices and the like.

(Prior art) Transmission of sunlight indoors using an optical system 1. , lighting and I
When using the device, it may be necessary to diffuse the transmitted light beam due to reasons such as the high density of the transmitted light beam or the need to increase the area of the illumination part.

Conventionally, concave lenses, convex lenses, Fresnel lenses, etc. made of glass or plastic have been used to expand or contract the cross section of the light beam.

(Problem to be solved by the invention) However, in these lenses, when the cross section of the target light beam is large, there are few standard products, and in order to obtain the required degree of diffusion and convergence, they must be custom-made, and the price is high. There was a problem that it was bulky.

(Means for Solving the Problems) The present invention was proposed in order to solve the above problems, and the present invention is a transparent method in which the light incident surface and/or light exit surface is formed into a curved surface having a required curvature. This invention relates to a lens made of a transparent plastic container, characterized in that the plastic container is filled with a liquid that absorbs little visible light.

(Function) As described above, in the present invention, a liquid that absorbs little visible light is filled in a transparent plastic container whose sunlight incident and/or exit surfaces are curved with a required curvature. The container itself is formed into a lens, which diffuses or converges the incident light while sunlight passes through the lens.

(Effects of the Invention) As described above, according to the present invention, a lens can be manufactured at low cost by filling a transparent plastic container in which the light incident surface and/or light exit surface is formed into a curved surface with a desired curvature with a liquid that absorbs little visible light. Configuration 1-1 By changing the curvature of the entrance surface and/or the exit surface, the degree of diffusion or convergence of sunlight can be set arbitrarily, and by changing the direction of the curved surfaces of the entrance surface and the exit surface, it is possible to Diffusion and convergence in only one direction, diffusion in two directions, and convergence are all possible.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(1) is a transparent octave made of acrylic resin, the incident surface (2) and the exit surface (3) of sunlight are formed into concave curved surfaces with the required curvature, and inside is distilled water, deionized water, etc. It is filled with a liquid (4) having a low visible absorption rate.

Next, the light diffusion and convergence mechanism of the above embodiment will be explained.

As shown in Figure 4 a, b, and c, the light is
In Fig. 5, if the incident angle of the incident ray to the air-acrylic resin interface is X and the outgoing angle is y, then sin x X 1.00 = sin y
X 1.49 -41 sin y X 1.49
= sin z X 1.33 --(2) holds true.

Here, if the angle between the emitted light and the incident light is A, then A
-x-z ---(4) By substituting equation (3) into equation (4).

Therefore, when 0≦X≦90°, as X increases, A
also increases.

Note that in Figure 5, the straight lines p and q extending from the center of curvature 0 of the entrance surface are not the same straight line because the thickness of the acrylic resin is exaggerated, but in reality, the acrylic resin is thinner than the radius of curvature of the entrance surface. Since the thickness is extremely thin, they can be considered to be the same straight line.

This means that for each party line a, b, and c in Figure 4, the light emitted from the acrylic resin-water interface is a.

It shows that it spreads in the order of b and c.

In FIG. 6, suppose that the incident angle at the water-acrylic resin interface is A, the outgoing angle is β, the incident angle at the acrylic resin-air interface is β, and the outgoing angle fr.

sin A X 1.33 = sin βX 1
．． 49sin βX 1.49 = sin r
X 1.00 is established, and γ −5in ''''' (1,33sin A).

Therefore, when O≦α≦90, γ also increases as A increases.

This means that for each of the rays a, b, and c in Figure 4,
It is shown that the light emitted from the acrylic resin-air interface further spreads in the order of a, b, and c.

As described above, according to the above embodiment, the degree of diffusion can be set arbitrarily by changing the curvature of the transparent plastic container (1) located on the light incident surface and the light exit surface, and the degree of diffusion can be set arbitrarily by By using a convex curved surface, the degree of convergence can be set arbitrarily, and by changing the direction of the curved surfaces of the entrance and exit surfaces, diffusion and convergence in only one direction, and diffusion and convergence in two directions are possible. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the transparent plastic lens according to the present invention, Fig. 2 is a longitudinal front view thereof, Fig. 3 is a longitudinal side view thereof, and Fig. 4 is a longitudinal cross-sectional view showing its light transmission state. The front view, FIGS. 5 and 6 are enlarged views of portions v and 2 of FIG. 4, respectively. (l)-transparent container, f2)-incident surface, (3)-output surface゛, (41=-liquid agent patent attorney Shigefumi Okamoto and two others ゛Exiting light Fig. 2

Claims (1)

[Claims] 1. A lens made of a transparent plastic container, characterized in that the transparent plastic container has a curved surface with a light entrance and/or exit surface having a predetermined curvature, and is filled with a liquid that absorbs little visible light.