JPS634334Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a prism panel for lighting equipment, and more specifically, to a prism panel for lighting equipment that is used by being attached to the front of the lighting equipment to obtain desired light distribution characteristics. It is.

[Background Art] As shown in FIG. 1, a prism panel for a lighting device has a plurality of panel bodies 1 each formed in an equilateral triangle, with the sides of a pair of adjacent panel bodies 1 coinciding with each other. A configuration arranged in is provided. This panel body 1 includes a first prism element 2a formed in a quadrangle and arranged at each vertex of an equilateral triangle, and a second prism element formed in a pentagonal shape arranged along the sides between the vertices. body 2b
and a third prism element 2c formed in a hexagonal shape that fills the portion surrounded by the first plurality of prism elements 2a and the second prism elements 2b. Each prism element 2a, 2b, 2c rotates a part of a rotating body, which has a spherical shape with a concave surface on the side of the lighting device and a cone shape with a concave concave surface on the side opposite to the lighting device. It is formed into a shape cut by a plane parallel to the axis. Therefore, since the shape of each prism element 2a, 2b, 2c is different, if the curvature of the surface on the lighting equipment side is the same, the light distribution curve of each prism element 2a, 2b, 2c will be different. As a result, the brightness of a specific part of the prism panel will be different from other parts, giving an unnatural impression. In particular, since this type of prism panel is intended to evenly diffuse the light from a lighting fixture, it is inconvenient for the light to be concentrated in a particular direction or for a particular part to be dark.

[Purpose of the invention] The present invention was made in view of the above points, and its main purpose is to make the light distribution curves of each prism element approximately equal in the prism panel having the above shape. The goal is to spread the light from the lighting equipment evenly.

[Disclosure of the invention] (Examples) Examples of the invention will be described below based on the drawings. As shown in FIG. 1, each panel element 1 is formed into an equilateral triangle, and a pair of adjacent panel elements 1 are arranged on one plane with one side matching each other. The panel element 1 has a plurality of prism bodies 2a, 2b, and 2c arranged, and each of the prism bodies 2a, 2b, and 2c has a first prism formed in a quadrangle arranged at the apex of an equilateral triangle. A small body 2a and a second prism small body 2 formed into a pentagon and arranged along the sides of an equilateral triangle.
b, and a third prism element 2c formed in a hexagon that fills a portion surrounded by the first prism element 2a and the second prism element 2b. In other words, regular hexagonal prism bodies are densely arranged on a plane and are cut out into an equilateral triangle.The apex of the equilateral triangle coincides with one apex of the hexagon, and the vertex and the It is cut so that the two sides of the equilateral triangle pass through two vertices whose central angles are 120 degrees apart from that vertex. As shown in FIG. 2, each of the prism bodies 2a, 2b, and 2c is a part of a spherical surface whose upper surface is concave downward, and the side surface of a cone whose lower surface is concave upward. The rotating body is cut out along a plane parallel to the vertical axis of rotation. By the way, the curvature of the upper surface is different for each of the prism bodies 2a, 2b, and 2c.
As shown in FIGS. 3 to 5, the first prism element 2a has a large curvature, followed by the second prism element 2b, and then the third prism element 2.
The curvature of the upper surface of c is naturally becoming smaller. The hatched portions of the first prism element 2a shown in FIG. 3 and the second prism element 2b shown in FIG. 4 are formed to have similar shapes to the third prism element 2c shown in FIG. 5. As shown in FIGS. 6 and 7, the diameter of this shaded area is the average value of the distance from the center to the side or apex when the central angle is divided into 12 equal parts including the diagonal. That is, if each distance in the first prism body 2a is L ₁ to _{L 12} and each distance in the second prism body 2b is l ₁ to _{l 12} , then the diameter of the shaded portion of the first prism body 2a is Da is expressed as Da=(L ₁ +L ₂ +...+L ₁₂ )/12, and the shaded diameter Db of the second prism element 2b is expressed as Db=(l ₁ +l ₂ +...l ₁₂ )/ It is expressed as 12. That is, the first prism body 2
Since the center portions of a and the second prism body 2b have similar shapes to the third prism body 2c, if the diameter of the third prism body 2c is Dc for the similar shape, then The dimensions of each part of the first prism element 2a and the second prism element 2b are Da/Dc and Db/Dc, respectively.
First prism element 2a and second prism element 2
The light distribution characteristics of the third prism body 2c are approximately the same as those of the third prism body 2c, and as a result, light does not shine only on a specific part of the panel body 1, and a substantially homogeneous light distribution is obtained. .

[Effects of the invention] As described above, in the present invention, a plurality of panel elements, each formed in an equilateral triangle, are arranged in such a way that the sides of a pair of adjacent panel elements coincide with each other, and each panel element has an equilateral triangle shape. a first prism body formed in a quadrangle arranged at each vertex of a triangle, a second prism body formed in a pentagon arranged along a side between each vertex, and a plurality of first prism bodies. Prism corpuscle and second
a hexagonal third prism body that fills the area surrounded by the prism body;
Each prism element has a spherical shape with a concave surface on the side of the lighting fixture, and a conical shape with a concave concave surface on the side opposite to the lighting fixture. In a prism panel for a lighting device formed in a cut shape, the curvature of the surface on the lighting device side is smaller than that of the first prism object, and the second prism object is smaller than the second prism object. Since the third prism element is formed small, the light distribution characteristics of each prism element with different shapes are approximately equal, and a specific part does not become bright or dark, and the light from the lighting equipment is reduced. This has the advantage that light can be diffused almost uniformly.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view showing an embodiment of the present invention;
Figure 2 is a sectional view showing the same prism body as above;
Figures a and b are a plan view and a cross-sectional view of the first prism body as described above, respectively, and Figures 4a and 4b are
b is a plan view of the second rhythmic body as above, respectively;
FIGS. 5a and 5b are a plan view and a diagram showing the cross-sectional shape of the third prism element as described above, and FIGS. 6 and 7 are views of the first prism element as described above, respectively. FIG. 6 is an explanatory diagram showing how to determine the distance for determining the diameter of a similar portion between the body and the third prism body in the second prism body. 1 is a panel element body, 2a is a first prism body,
2b is a second prism body, and 2c is a third prism body.

Claims (1)

[Scope of utility model registration request] A plurality of panel bodies, each formed into an equilateral triangle, are arranged so that the sides of a pair of adjacent panel bodies match each other, and each panel body is formed into a quadrilateral and placed at each vertex of the equilateral triangle. Surrounded by a first prism body, a pentagonal second prism body arranged along the sides between the respective vertices, the first plurality of prism bodies and the second prism body. The third prism element is formed into a hexagonal shape that fills the part where the prism element is located. In a prism panel for a lighting device, which is formed by cutting out a part of a conical rotating body that is concave and recessed in a plane parallel to the rotation axis, the curvature of the surface on the lighting device side is the same as that of the first prism element. A prism panel for a lighting device, wherein a second prism element is smaller than the second prism element, and a third prism element is smaller than the second prism element.