DE102022002757A1 - Direction-dependent translucent, microstructured anti-glare lens for use in lights - Google Patents

Abstract

Different luminaire designs require unequal glare reduction properties in the 2 orthogonal main axes of standard translucent glare reduction covers for uniform all-round glare reduction. By arranging the anti-glare prisms in rectangular, non-square grids, when the microprisms overlap each other, surfaces are preferentially created in one spatial direction, which cause greater glare reduction. The same effect occurs with square gratings and elongated microprisms.

Description

State of the art:

To reduce the glare from a lamp, so-called anti-glare lenses are used. These usually consist of transparent panes that have an optically effective structure on one or both surfaces, which reduces the light that emerges from the lamp at a shallow angle to the surface. Such a structure achieves this by deflecting light components back into the housing at a flat angle, and then scattering them on a diffuse rear wall and thus leaving the lamp at a new exit angle.

Profile lights are characterized by the fact that their length is a multiple of their width. This results in different glare values for the two axes even without a glare reduction structure. In Europe, these glare values are often characterized using the UGR value.

The glare-reduction structures generally used in the luminaires are universal and are used in very different lamp geometries. The glare reduction properties of the standard structures are largely similar in the main axes of the structure due to the symmetry of the microprisms.

Description of the invention:

The aim of this newly invented anti-glare structure is to specifically utilize the luminaire geometry of profile lights and thus achieve a significant improvement in uniform glare reduction compared to universally applicable anti-glare structures.

To optimize the UGR value in room lighting, it is recommended to adjust the luminaire glare control so that it has a stronger effect in the direction of the larger luminaire glare and less in the direction of the weaker luminaire glare. Accordingly, an adapted glare reduction structure should have significantly different effects in the main axes. Overall, a better and more uniform glare reduction value is achieved than with a universal glare reduction structure.

1. 1) Solche, bei denen das Gehäuse, bis auf eine Lichtaustrittsfläche an der Unterseite, nicht lichtdurchlässig sind. Durch den Abstand der LED-Leiste zum Lichtaustritt ergibt es sich in diesem Fall, dass Licht welches flach von der LED in Querrichtung zur Leuchte abgestrahlt wird, das Lampen Gehäuse trifft und somit nicht zur Blendung beiträgt. Hier ist durch die Struktur in erster Linie eine gut wirksame Entblendung in Längsrichtung zu gewährleisten. 1
2. 2) Solche, bei denen ein Teil der Seitenwand transluzent (oft opal) gehalten wird und somit zur Beleuchtung beiträgt (Extrusionsprofile). Diese beleuchteten Seitenwände sind somit blendungsrelevant. Für diese Bauform muss die Struktur eher in Querrichtung die Entblendung verstärken. 2

For example, there are basically two types of profile lights.

1. 1) Those in which the housing is not translucent except for a light exit surface on the underside. In this case, the distance between the LED strip and the light exit means that light that is emitted flatly from the LED in the transverse direction to the luminaire hits the lamp housing and therefore does not contribute to glare. Here, the structure is primarily intended to ensure effective glare reduction in the longitudinal direction. 1
2. 2) Those in which part of the side wall is kept translucent (often opal) and thus contributes to lighting (extrusion profiles). These illuminated side walls are therefore relevant to glare. For this design, the structure must increase glare reduction in the transverse direction. 2

Universally applicable anti-glare structures usually consist of pyramids or cones that have a defined surface inclination angle and are square or circular in base area. If you break this symmetry and extrude the prismatic profile lengthwise, you achieve more pronounced glare reduction along the shorter axis of the structural element.

The asymmetry of the glare reduction performance can be achieved in simple terms by the fact that the prism surfaces or the main axes are of different sizes when summed up over all prisms.

1. a) In der Grundfläche quadratische oder zirkulare Entblendungs-Mikroprismen und solche, deren Grundfläche länglich von quadratisch nach rechteckig oder von zirkular nach elliptisch modifiziert ist. 3
2. b) Mikroprismen, bei denen die längere Achse der Grundfläche durch gegenüberliegende spitze Winkel begrenzt ist (4 Raute, Schiffchen)
3. c) Die räumliche Anordnung der Mikroprismen entlang der Hauptachsen unterschiedlich ist, also ein nicht-quadratische Raster. 5
4. d) nicht quadratische Raster mit alternierend in Reihen versetzten Mikroprismen. 6

This can be achieved by

1. a) Square or circular anti-glare microprisms in the base and those whose base is elongated from square to rectangular or from circular to elliptical. 3
2. b) Microprisms in which the longer axis of the base surface is limited by opposing acute angles ( 4 diamond, boat)
3. c) The spatial arrangement of the microprisms is different along the main axes, i.e. a non-square grid. 5
4. d) non-square grids with microprisms arranged in alternating rows. 6

• • quadratische Gitter (Rastermaß in beiden Hauptachsen gleich) mit länglichen Mikroprismen
• • nicht-quadratische Gitter (Rastermaß in beiden Hauptachsen gleich) mit quadratischen bzw. zirkularen Mikroprismen
• • nicht-quadratische Gitter (Rastermaß in beiden Hauptachsen gleich) mit länglichen Mikroprismen

erreichen die beschriebenen Mikroprismen-Anordnungen unterschiedliche Endblendungscharakteristika in den Hauptachsen wie in 7 dargestellt.In application

• • square grids (same pitch in both main axes) with elongated microprisms
• • Non-square gratings (same pitch in both main axes) with square or circular microprisms
• • non-square gratings (same pitch in both main axes) with elongated microprisms

The microprism arrangements described achieve different end glare characteristics in the main axes as in 7 shown.

This is how you can use linear lights with non-transparent side walls ( 1 ) improve all-round glare control with a structure in which the “strong glare” is perpendicular to the main axis of the luminaire.

For a linear light with luminous side walls ( 2 ), you can improve the all-round glare reduction with a structure in which the strong glare reduction runs parallel to the main axis of the luminaire.

Illustrations:

• 1 : Linear luminaire with microstructured anti-glare cover panel
• 2 : Linear luminaire with microstructured, anti-glare cover and translucent side wall
• 3 : square, circular and elongated microprism structures
• 4 : elongated microprisms with sharp-edged longitudinal boundaries
• 5 : non-square prism grid (square, circular and elongated microprisms
• 6 : non-square alternating prism grid (square, circular and elongated microprisms
• 7 : Luminance distribution in polar coordinates for the 2 main axes

Claims (3)

Translucent anti-glare structure with a regular grid (square) of elongated anti-glare prisms (boat, diamond pyramid, extruded pyramid, elliptical cone,...), overlapping each other. Translucent anti-glare structure with irregular grid (rectangular, a unequal b) of elongated anti-glare prisms (boat, diamond pyramid, extruded pyramid, elliptical cone,...), overlapping each other. Translucent anti-glare structure with irregular grid (rectangular, a unequal b) of square or circular regular anti-glare prisms (pyramid, cone,...), overlapping each other.

Images