CA2034710A1 - Reflector - Google Patents

Abstract

ABSTRACT

REFLECTOR

For lighting, particularly in glass horticulture, assimi-lation lighting is applied to improve the quality the crop.
In order to obtain the most regular possible progression of the light output, which is expressed in the polar diagram, a reflector is used according to the invention. The reflector has a central lengthwise plane where the lighting element is placed, while relief surfaces are arranged on either side of planes of symmetry passing through the centre point of the reflector. It has been found in practice that the polar dia-gram is improved as a result of the relief surfaces.

Description

D HO/AM/~ Poot RE~LECTOR

The invention relates to a reflector for diffusing light as uniformly as possible.
Assimilation lighting is applied particularly in glass horticulture. Due to this lighting the production of the crop is increased and the quality improved. Especially in the seasons when the natural incidence of light is limited is lighting of vital importance. It is the object of the inven-tion to provide a reflector the light output of which is as uniform as possible. This is expressed by the most regular possible progression of the so-called polar diagram.
This is achieved according to the invention by providing a reflector consisting of an approximately semi-elliptical body cut through along the longitudinal axis and having at least two planes of symmetry standing perpendicular to each other, means for arranging a lighting element at approximately the intersection of the planes of symmetry and, running along the main axis, first relief surfaces arranged on either side of one of the planes of symmetry in the surface of the sphere and second relief surfaces arranged on either side of that plane of symmetry at a greater distance from that plane of symmetry than the first.
Practical tests have shown that a reflector with relief surfaces according to the invention produces a regular polar diagram of the desired form.
According to a preferred embodiment the surface areas of the second relief surfaces are larger than those of the first.
The placing of the relief surfaces is also preferably such that these lie symmetrically relative to both planes of sym-metry~

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203~710 The invention is further elucidated with reference to the drawings.
In the drawings:
Fig. 1 shows a perspective view of the reflector accord-ing to the invention, fig. 2 shows a sectional view of the reflector of fig.
1, and fig. 3 shows a sectional view from a position turned through 90 relative to that of fig. 2.
The reflector 1 has a half sphere-like shape and is provided with connecting means 2 for attaching a light ele-ment. In the reflector can be discerned two planes of symmetry standing perpendicular to one another, namely, one plane of symmetry in lengthwise direction and one central section plane of symmetry in a position perpendicular thereto. Series of first relief surfaces 3 and 4 are arranged symmetrically relative to the planes of symmetry. At an interval from the relief surfaces 3, 4 second relief surfaces, one 5 of which is visible, are arranged at a greater distance from the planes of symmetry than the first relief surfaces. The surface area of the relief surface 5 is chosen larger than the part sur-faces of the series of relief surfaces 3 and 4.

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Claims (3)

1. Reflector (1) consisting of an approximately semi-elliptical body cut through along the longitudinal axis and having at least two planes of symmetry standing perpendicular to each other, means (2) for arranging a lighting element at roughly the intersection of the planes of symmetry and running along the main axis, first relief surfaces (3, 4) arranged on either side of one of the planes of symmetry in the surface of the sphere and second relief surfaces (5) arranged on either side of that plane of symmetry at a greater distance from that plane of symmetry than the first relief surfaces.

2. Reflector as claimed in claim 1, characterized in that the first relief surfaces (3, 4) each have a small sur-face area relative to the second relief surfaces (5).

3. Reflector as claimed in claims 1-2, characterized in that the relief surfaces (3, 4, 5) are placed symmetrically relative to both planes of symmetry.