EP0643259A1 - A cross lamella for a light box - Google Patents

A cross lamella for a light box Download PDF

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Publication number
EP0643259A1
EP0643259A1 EP94202539A EP94202539A EP0643259A1 EP 0643259 A1 EP0643259 A1 EP 0643259A1 EP 94202539 A EP94202539 A EP 94202539A EP 94202539 A EP94202539 A EP 94202539A EP 0643259 A1 EP0643259 A1 EP 0643259A1
Authority
EP
European Patent Office
Prior art keywords
cross
lamella
boundary surface
cross lamella
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94202539A
Other languages
German (de)
French (fr)
Other versions
EP0643259B1 (en
Inventor
Simon Cornelis Van Putten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VEKO PRODUCTS B.V.
Original Assignee
van Putten, Simon Cornelis
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from NL9301557A external-priority patent/NL9301557A/en
Priority claimed from NL9302169A external-priority patent/NL9302169A/en
Application filed by van Putten, Simon Cornelis filed Critical van Putten, Simon Cornelis
Publication of EP0643259A1 publication Critical patent/EP0643259A1/en
Application granted granted Critical
Publication of EP0643259B1 publication Critical patent/EP0643259B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type

Definitions

  • the invention relates to a cross lamella for a light box, in which a plurality of cross lamellae are disposed at least substantially parallel to each other under (a) light source(s), transversely to the longitudinal direction of said box, and whereby the cross lamella is bounded by lateral boundary surfaces sloping upwards from the lower boundary edge of the lamella in a direction away from each other, said lateral boundary surfaces being interconnected near their upper edges by an upper boundary surface, in such a manner that the cross lamella is substantially triangular, seen in sectional view.
  • cross lamellae of the above type With the usual cross lamellae of the above type the cross lamella is symmetrical, seen in sectional view, and the boundary surfaces extend upwards from the lower boundary edge along the same distance, so that the upper boundary surface of the cross lamella extends parallel to the longitudinal direction of the light box, which will usually be fitted with TL-tubes or the like above the cross lamellae.
  • At least part of the light from the light source(s) will be screened by the upper boundary surfaces of the lamella, and, when the light sources are disposed in the usual horizontal manner, be reflected in vertical direction. On the one hand this leads to a reduced efficiency of the armature, since the light supplied by the light source(s) is not utilized optimally, whilst on the other hand objectionable reflections may be produced.
  • the one lateral boundary surface extends upwards from the lower boundary edge of the cross lamella along a greater distance than does the other lateral boundary surface.
  • the width of the upper boundary surface, seen in the longitudinal direction of the light box, will be reduced, as a result of which less light from the light source(s) will be screened and the efficiency of the armature will be enhanced.
  • Figure 1 is a side view of a cross lamella according to the invention.
  • Figure 2 is a smaller-scale cross-sectional view of a number of cross lamellae arranged in side-by-side relationship.
  • Figure 3 is a diagrammatic view of a light box.
  • Figure 4 is a front view of another embodiment of a cross lamella according to the invention.
  • Figure 5 is a front view of a third embodiment of a cross lamella according to the invention.
  • Figure 6 is a plan view of Figure 5.
  • Figure 7 is a side view of Figure 5.
  • a light box comprising one or more light sources fitted therein, in particular (a) TL-tube(s), whereby the light box, more in particular said TL-tube(s), extend(s) horizontally, although also other arrangements of such a light box will be conceivable, of course.
  • Each cross lamella has two lateral boundary surfaces 4 and 5, which extend upwards from a lower boundary edge 3 of the cross lamella 2 in a direction away from each other and which are curved, when seen in sectional view, more particularly said boundary surfaces 4 and 5 are parabolic.
  • the boundary surface 4 thereby extends upwards from the lower boundary edge 3 of the lamella along a greater distance than does the boundary surface 5.
  • the upper edges of the lateral boundary surfaces 4 and 5 are interconnected by an upper boundary surface 6, which, assuming that the light box 1 is disposed horizontally as indicated above, includes an angle with the horizontal, seen in sectional view.
  • the lamellae 2 in the box 1 are preferably arranged mirror-symmetric with respect to the centre transverse plane of the light box 1, as illustrated for four lamellae in Figure 2.
  • the upper boundary surface 6 may also be curved rather than being made up of a straight surface.
  • the upper surface 6 may be provided with ribs extending transversely to the longitudinal direction of the lamella, substantially in the longitudinal direction of the box, therefore, and/or with perforations and/or be covered with a foil having a prismatic structure, which has a light-deflecting function.
  • the cross lamella 2 shown in Figures 5 - 7 likewise has two lateral boundary surfaces 4 and 5, which extend upwards from a lower boundary edge 3 of the cross lamella 2 in a direction away from each other and which are preferably curved, when seen in sectional view, more particularly said boundary surfaces 4 and 5 are parabolic.
  • connecting lines 7 and 8 between the side edges of the upper boundary surface 6 and the upper edges of the lateral boundary surfaces 4 and 5 are curved in this embodiment.
  • centre of curvature of the connecting line 8 is thereby located at the side of the connecting line 8 remote from the connecting line 7.
  • centre of curvature of the connecting line 7 is located at the side of the connecting line 7 remote from the connecting line 8.
  • the width of the upper boundary surface 6 thereby gradually decreases from the ends of the cross lamella towards the centre of the cross lamella, seen in plan view.

Abstract

The invention relates to a cross lamella for a light box, in which a plurality of cross lamellae are disposed at least substantially parallel to each other under (a) light source(s), transversely to the longitudinal direction of said box, and whereby the cross lamella is bounded by lateral boundary surfaces sloping upwards from the lower boundary edge of the lamella in a direction away from each other, said lateral boundary surfaces being interconnected near their upper edges by an upper boundary surface, in such a manner that the cross lamella is substantially triangular, seen in sectional view, and whereby the one lateral boundary surface extends upwards from the lower boundary edge of the cross lamella along a greater distance than does the other lateral boundary surface.

Description

  • The invention relates to a cross lamella for a light box, in which a plurality of cross lamellae are disposed at least substantially parallel to each other under (a) light source(s), transversely to the longitudinal direction of said box, and whereby the cross lamella is bounded by lateral boundary surfaces sloping upwards from the lower boundary edge of the lamella in a direction away from each other, said lateral boundary surfaces being interconnected near their upper edges by an upper boundary surface, in such a manner that the cross lamella is substantially triangular, seen in sectional view.
  • With the usual cross lamellae of the above type the cross lamella is symmetrical, seen in sectional view, and the boundary surfaces extend upwards from the lower boundary edge along the same distance, so that the upper boundary surface of the cross lamella extends parallel to the longitudinal direction of the light box, which will usually be fitted with TL-tubes or the like above the cross lamellae.
  • At least part of the light from the light source(s) will be screened by the upper boundary surfaces of the lamella, and, when the light sources are disposed in the usual horizontal manner, be reflected in vertical direction. On the one hand this leads to a reduced efficiency of the armature, since the light supplied by the light source(s) is not utilized optimally, whilst on the other hand objectionable reflections may be produced.
  • According to the invention the one lateral boundary surface extends upwards from the lower boundary edge of the cross lamella along a greater distance than does the other lateral boundary surface.
  • By using the construction according to the invention the width of the upper boundary surface, seen in the longitudinal direction of the light box, will be reduced, as a result of which less light from the light source(s) will be screened and the efficiency of the armature will be enhanced.
  • Part of the stream of light from the light, source(s) is no longer vertically reflected into the light box by the upper boundary surface, but, as a result of the position of the upper boundary surface of the cross lamella, which deviates from the horizontal position, beamed directly into the space below the light box without blinding.
  • As a result of the different angles of incidence and exit of the light from the light source(s) achieved by altering the position of the boundary surface, also the occurrence of objectionable light reflections appears to be considerably less than is the case with the constructions that have been usual so far. A further reduction of the width of the upper boundary surface, seen in the longitudinal direction of the light box, so that an even better utitilization of the light from the light source(s) may be obtained, can be achieved when the connecting lines between the side edges of the upper boundary surface and the upper edges of the lateral boundary surfaces are both curved, whereby the centre of curvature of each connecting line is located at the side of the respective connecting line remote from the other connecting line.
  • The invention will be explained in more detail hereafter with reference to embodiments of the construction according to the invention diagrammatically illustrated in the accompanying Figures.
  • Figure 1 is a side view of a cross lamella according to the invention.
  • Figure 2 is a smaller-scale cross-sectional view of a number of cross lamellae arranged in side-by-side relationship.
  • Figure 3 is a diagrammatic view of a light box.
  • Figure 4 is a front view of another embodiment of a cross lamella according to the invention.
  • Figure 5 is a front view of a third embodiment of a cross lamella according to the invention.
  • Figure 6 is a plan view of Figure 5.
  • Figure 7 is a side view of Figure 5.
  • The description below is based on a light box comprising one or more light sources fitted therein, in particular (a) TL-tube(s), whereby the light box, more in particular said TL-tube(s), extend(s) horizontally, although also other arrangements of such a light box will be conceivable, of course.
  • As is diagrammatically indicated in Figure 3, a number of cross lamellae 2 extending parallel to each other are thereby provided under the light source(s) (not shown) within the light box.
  • Each cross lamella has two lateral boundary surfaces 4 and 5, which extend upwards from a lower boundary edge 3 of the cross lamella 2 in a direction away from each other and which are curved, when seen in sectional view, more particularly said boundary surfaces 4 and 5 are parabolic. As is apparent in particular from Figure 2 the boundary surface 4 thereby extends upwards from the lower boundary edge 3 of the lamella along a greater distance than does the boundary surface 5. The upper edges of the lateral boundary surfaces 4 and 5 are interconnected by an upper boundary surface 6, which, assuming that the light box 1 is disposed horizontally as indicated above, includes an angle with the horizontal, seen in sectional view. It will be apparent that the surface of the above-described embodiment which is bounded by the upper boundary surface is thus smaller, measured in the longitudinal direction of the box, than would be the case if the boundary surface 5 were to extend upwards along the same distance as the boundary surface 4, in which case the upper edges of the two boundary surfaces 4 and 5 would be interconnected by a boundary surface extending horizontally, seen in sectional view.
  • As already explained above this will make it possible to achieve an enhanced efficiency of the light box and the light source(s) provided therein.
  • Because of the asymmetric shape of the lamella also the screening angle for the light emission will become asymmetric, as will be apparent from the angles æ and β indicated in Figure 2. In order to obtain an even distribution of the emitted light all the same, the lamellae 2 in the box 1 are preferably arranged mirror-symmetric with respect to the centre transverse plane of the light box 1, as illustrated for four lamellae in Figure 2.
  • As is illustrated in more detail for the embodiment shown in Figure 4, the upper boundary surface 6 may also be curved rather than being made up of a straight surface.
  • In order to further influence the angle at which the light is emitted the upper surface 6 may be provided with ribs extending transversely to the longitudinal direction of the lamella, substantially in the longitudinal direction of the box, therefore, and/or with perforations and/or be covered with a foil having a prismatic structure, which has a light-deflecting function.
  • The cross lamella 2 shown in Figures 5 - 7 likewise has two lateral boundary surfaces 4 and 5, which extend upwards from a lower boundary edge 3 of the cross lamella 2 in a direction away from each other and which are preferably curved, when seen in sectional view, more particularly said boundary surfaces 4 and 5 are parabolic.
  • The upper edges of the lateral boundary surfaces 4 and 5 are interconnected by an upper boundary surface 6, which in the usual user position includes an angle with the horizontal, as is illustrated in Figure 7.
  • As furthermore appears in particular from Figure 6 the connecting lines 7 and 8 between the side edges of the upper boundary surface 6 and the upper edges of the lateral boundary surfaces 4 and 5 are curved in this embodiment. As furthermore appears from Figure 6 the centre of curvature of the connecting line 8 is thereby located at the side of the connecting line 8 remote from the connecting line 7. Similarly the centre of curvature of the connecting line 7 is located at the side of the connecting line 7 remote from the connecting line 8.
  • As will furthermore be apparent from Figure 6 the width of the upper boundary surface 6 thereby gradually decreases from the ends of the cross lamella towards the centre of the cross lamella, seen in plan view.
  • It will be apparent that as a result of lamellae thus shaped being used in a light box the non-transmitting surface formed by the upper boundary surfaces 6 will be comparatively small, so that when lamellae of this type are used in a light box less light from the light source(s) will be screened and thus the efficiency will be enhanced.

Claims (10)

  1. A light box, in which a plurality of cross lamellae are disposed at least substantially parallel to each other under (a) light source(s), transversely to the longitudinal direction of said box, and whereby the cross lamella is bounded by lateral boundary surfaces sloping upwards from the lower boundary edge of the lamella in a direction away from each other, said lateral boundary surfaces being interconnected near their upper edges by an upper boundary surface, in such a manner that the cross lamella is substantially triangular, seen in sectional view, characterized in that the one lateral boundary surface extends upwards from the lower boundary edge of the cross lamella along a greater distance than does the other lateral boundary surface.
  2. A cross lamella according to claim 1, characterized in that the lower boundary edge of the cross lamella extends rectilinearly.
  3. A cross lamella according to claim 1 or 2, characterized in that the upper boundary edges of the lateral boundary surfaces extend parallel to the lower boundary edge of the lamella.
  4. A cross lamella according to claim 1 or 2, characterized in that the upper boundary edges of the lateral boundary surfaces are curved.
  5. A cross lamella according to any one of the preceding claims, characterized in that the upper boundary surface is provided with ribs extending in the longitudinal direction of the cross lamella.
  6. A cross lamella according to any one of the preceding claims, characterized in that the upper boundary surface of the cross lamella is provided with perforations.
  7. A cross lamella according to any one of the preceding claims, characterized in that the upper boundary surface is covered with a foil having a prismatic structure, which has a light-deflecting function.
  8. A cross lamella according to any one of the preceding claims, characterized in that the connecting lines between the side edges of the upper boundary surface and the upper edges of the lateral boundary surfaces are both curved, whereby the centre of curvature of each connecting line is located at the side of the respective connecting line remote from the other connecting line.
  9. A light box provided with cross lamellae according to any one of the preceding claims.
  10. A light box according to claim 9, characterized in that said cross lamellae are arranged mirror-symmetrically relative to the centre transverse plane of the light box.
EP94202539A 1993-09-09 1994-09-06 A cross lamella for a light box Expired - Lifetime EP0643259B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL9301557 1993-09-09
NL9301557A NL9301557A (en) 1993-09-09 1993-09-09 Transverse lamella for a light box
NL9302169A NL9302169A (en) 1993-12-13 1993-12-13 Transverse lamella for a light box
NL9302169 1993-12-13

Publications (2)

Publication Number Publication Date
EP0643259A1 true EP0643259A1 (en) 1995-03-15
EP0643259B1 EP0643259B1 (en) 1999-12-08

Family

ID=26647129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202539A Expired - Lifetime EP0643259B1 (en) 1993-09-09 1994-09-06 A cross lamella for a light box

Country Status (3)

Country Link
EP (1) EP0643259B1 (en)
AT (1) ATE187538T1 (en)
DE (1) DE69421979D1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734044A1 (en) * 1995-05-11 1996-11-15 Vial Henri Noel Cellular diffuser for fluorescent light fitting
NL1005610C2 (en) * 1997-03-24 1998-09-28 Veco Products B V Illuminated sign with a transverse blade.
EP0903535A2 (en) * 1997-09-23 1999-03-24 SEMPERLUX GmbH, LICHTTECHNISCHES WERK Louvre system for lamps
WO2005103558A1 (en) * 2004-04-19 2005-11-03 Honeywell International Inc. Luminaires with batwing light distribution

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138747A1 (en) * 1983-10-18 1985-04-24 Semperlux GmbH Parabolic strip element for elongated lamps
AT383411B (en) * 1986-03-26 1987-07-10 Zumtobel Ag LIGHT GRID
WO1990012245A1 (en) * 1989-04-07 1990-10-18 Ifa Electric A/S Improvement in fixtures for luminous tubes
EP0435394A1 (en) * 1989-12-27 1991-07-03 Koninklijke Philips Electronics N.V. Luminaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138747A1 (en) * 1983-10-18 1985-04-24 Semperlux GmbH Parabolic strip element for elongated lamps
AT383411B (en) * 1986-03-26 1987-07-10 Zumtobel Ag LIGHT GRID
WO1990012245A1 (en) * 1989-04-07 1990-10-18 Ifa Electric A/S Improvement in fixtures for luminous tubes
EP0435394A1 (en) * 1989-12-27 1991-07-03 Koninklijke Philips Electronics N.V. Luminaire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734044A1 (en) * 1995-05-11 1996-11-15 Vial Henri Noel Cellular diffuser for fluorescent light fitting
NL1005610C2 (en) * 1997-03-24 1998-09-28 Veco Products B V Illuminated sign with a transverse blade.
WO1998043015A1 (en) * 1997-03-24 1998-10-01 Veko Products B.V. A light box comprising a cross lamella
EP0903535A2 (en) * 1997-09-23 1999-03-24 SEMPERLUX GmbH, LICHTTECHNISCHES WERK Louvre system for lamps
EP0903535A3 (en) * 1997-09-23 2000-09-20 Semperlux Aktiengesellschaft, Lichttechnische Werke Louvre system for lamps
WO2005103558A1 (en) * 2004-04-19 2005-11-03 Honeywell International Inc. Luminaires with batwing light distribution

Also Published As

Publication number Publication date
DE69421979D1 (en) 2000-01-13
EP0643259B1 (en) 1999-12-08
ATE187538T1 (en) 1999-12-15

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