TH32044A - Lantern - Google Patents

Abstract

DC60 (02/06/41) The luminaire has a concave reflector (1) with an optical axis (3) in the plane of symmetry (2) suitable for receiving a light source longitudinally perpendicular to that plane (2). The reflector (1) consists of flat sides (10,10') which are bounded by a first parallel plane (8) perpendicular to the plane of symmetry (2) and to which the sides (10,10') are arranged in a row (11,11') by a second plane (9) parallel to the plane of symmetry (2). The first plane (8) is at an angle of curvature to the emission envelope (5). The reflector (1) touches such an envelope (5) on one side of axis (3) and is extended by a reflector grid shown (7) to such an envelope (5) on the opposite side of axis (3). The luminaire can be used to illuminate stadiums, where the emission envelope (5), which is straightened downwards, has an acute cut-off angle and prevents extraretinal light over the horizontal plane. The luminaire has a concave reflector (1) with an optical axis (3) in the plane of symmetry (2) suitable for receiving a light source perpendicular to that plane (2). The reflector (1) consists of flat sides (10,10'') which are bounded by a first parallel plane (8) perpendicular to the plane of symmetry (2) and to which the sides (10,10'') are arranged in a row (11,11'') by a second plane (9) parallel to the plane of symmetry (2). The first plane (8) is at an angle of curvature to the emission opening (5). The reflector (1) touches such opening (5) on one side of the axis (3) and is extended by a reflector grid shown (7) to such opening (5) on the opposite side of the axis (3). The luminaire can be used to illuminate stadiums, where the emission opening (5), which is straightened downwards, has an acute cut-off angle and prevents extraretinal light over the horizontal plane.

Claims (15)

1. The luminaire consists of: a concave reflector (1) with a plane of symmetry (2) and an optical axis (3) with an optical center (4) in such plane (2); a light emitter (5) that is in contact with the reflector (1) and perpendicular to the plane of symmetry (2); a section (6) for inserting the light bulb perpendicular to the plane of symmetry (2) with the long light source of the bulb in such a way as the optical center (4); The reflecting grating (7), extending along the optical axis (3) perpendicular to the plane of symmetry (2) and reaching the emission zone (5), where the reflector (1) consists of several planar sides (10,10'') which in its width w are bounded by a first mutually parallel smooth plane (8) perpendicular to the plane of symmetry and which in its length 1 is bounded by a second smooth plane (9) which arranges the sides in a row (11,11'') extending along the plane of symmetry, is characterized in such a way that the first smooth plane (8) covers the curved angle with the emission zone (5) and the grating (7) extends the reflector (1) until it reaches the emission zone (5). 2. The luminaire as described in claim 7 is characterized in such a way that the side panel (20) extends to the grille (7) on either side of the plane of symmetry (2), to which the panel extends into the light outlet (5), and encloses the side (10'') of the furthest row (11'') that is removed from the plane of symmetry (2). 3. The luminaires as described in claim 1 or 2 are characterized in such a way that the grille (7) and side panels (20) are diffuse reflectors. 4. The luminaires as described in claims 1, 2 or 3 are defined in such a way that the side panels (20) approach each other in a direction toward the grille (7). 5. The luminaire, as stated in claim 1 or 2, is defined as having properties such that the first smooth plane (8) has a point of intersection (12) with the reflector (1) in the plane of symmetry (2) which lies on the parabola whose focus is the optical center (4). 6. The luminaires referred to in claims 1, 2, or 5 are defined as such that the reflector (1) has a side (10) with a width w on the side of the optical axis (3) furthest from the grating (7) than on the side of this axis (3) closest to the grating (7). 7. The luminaire as described in claim 5 is characterized in such a way that the side (10a) adjacent to the grating (7) in the plane of symmetry (2) is inclined to the parabola of this grating (7). 8. The luminaire as described in claim 5 or 7 is defined as having properties such that the side (10b) in contact with the emission opening (5) in the plane of symmetry (2) is tilted away from the parabola along the emission opening (5). 9. The luminaire as described in claim 5 is characterized in such a way that the grating (7) and the optical axis (3) are separated by an angle of small degrees in the direction toward the emission port (5). 10. The luminaires as described in claims 1, 2 or 5 are characterized in such a way that the reflector (1) does not have more than three rows (11,11'') of sides (10,10''). 11. The luminaires referred to in claims 1, 2 or 3 are characterized in such a way that a second smooth plane (9) is parallel to the plane of symmetry (2). 12. The luminaires as described in claims 1, 2 or 11 are characterized in such that side (10) of the first row (11) intersects the plane of symmetry (2) and is measured in the first flat plane (8) covering an angle of 35 to 45 degrees with the side (10'') of the adjacent row (11''). 13. The luminaires as referred to in claims 1, 2 or 11 are characterized in such a way that the grating (7) is at least parallel to the first flat plane (8). 14. The luminaires referred to in claims 1, 2 or 11 are characterized in such that the emission opening (5) is closed by a transparent sheet (21). 15. The luminaire as described in claim 2 is defined as such that the emission opening (5) is closed by a translucent plate (21) and that a long, narrow plate (22) extends from the emission opening (5) to the luminaire along each side panel (20) parallel to the plane of symmetry (2) (Clause 15, page 3, figure 5).