WO2008155705A1 - Lampe allongée comprenant une pluralité de del, et système d'éclairage - Google Patents

Lampe allongée comprenant une pluralité de del, et système d'éclairage Download PDF

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Publication number
WO2008155705A1
WO2008155705A1 PCT/IB2008/052359 IB2008052359W WO2008155705A1 WO 2008155705 A1 WO2008155705 A1 WO 2008155705A1 IB 2008052359 W IB2008052359 W IB 2008052359W WO 2008155705 A1 WO2008155705 A1 WO 2008155705A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
lens
lamp
elongated
array
Prior art date
Application number
PCT/IB2008/052359
Other languages
English (en)
Inventor
Martijn Riemeijer
Denis J. C. Van Oers
Peter A. Wachters
Original Assignee
Koninklijke Philips Electronics N.V.
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
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008155705A1 publication Critical patent/WO2008155705A1/fr

Links

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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/001—Devices for lighting, humidifying, heating, ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/30—Lighting for domestic or personal use
    • F21W2131/305—Lighting for domestic or personal use for refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/405—Lighting for industrial, commercial, recreational or military use for shop-windows or displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D27/00—Lighting arrangements

Definitions

  • Elongated lamp comprising a plurality of LEDs, and illumination system
  • the invention relates to an elongated lamp comprising a plurality of LEDs (light-emitting diodes) in only one straight array, wherein an elongated lens extends parallel to the array of LEDs, and the LEDs and the lens have a common longitudinal plane of symmetry.
  • An elongated lens is a lens having a certain predetermined transverse cross- section over a substantial part of its length.
  • Such an elongated lamp is disclosed in EP-A- 1758068.
  • This publication describes a lamp comprising an elongated U-shaped body whose bottom is provided with an array of LEDs. An elongated lens is clamped between the legs of the U-shaped body so as to obtain a beam of light emitted by the lamp.
  • Lamps comprising a plurality of LEDs can be used as an alternative for conventional light sources and are capable of replacing typical fluorescent and incandescent lamps.
  • a LED can emit a bright light beam, and a lamp comprising a plurality of LEDs can be designed in such a way that its light radiation is similar to the light radiation of a conventional fluorescent or incandescent lamp.
  • the invention particularly relates to an elongated lamp for illuminating merchandise in a cupboard freezer having a plurality of neighboring transparent doors at its front side.
  • Each door can hinge about a vertical axis, or can shift in its plane in the horizontal direction, so that the merchandise is approachable by a person who opens the door.
  • the elongated lamps are mounted behind the door cheeks, i.e. the vertical posts or jambs along both edges of the doors when the doors are closed.
  • the doors may have a hinged connection with the door cheeks, and, when sliding doors are used, they may slide in front of the door cheeks.
  • the lamps illuminate merchandise behind the doors, with the light beams of the lamps behind two neighboring door cheeks overlapping each other so as to illuminate the merchandise from two sides.
  • the merchandise is illuminated by means of tube- like fluorescent lamps mounted behind the door cheeks.
  • the merchandise in the cupboard freezer is then not evenly illuminated, because the part of the merchandise in the central part of the freezer is illuminated to a less intensive extent than the merchandise near the edge of the door.
  • the LEDs in the elongated lamp are side-emitting LEDs, wherein the lens comprises, in a cross-section, two convergent parts at opposite sides of the array of LEDs.
  • the expression 'convergent' is herein understood to mean that a light beam passing the convergent part of the lens becomes less divergent.
  • Side-emitting LEDs are commercially available and are disclosed in, for example, EP-A-1376708. Such a side-emitting LED is integrated with an optical structure, wherein the light radiation is emitted mainly laterally, i.e. substantially in radial directions around the central axis of the LED, and the light radiation generally diverges with respect to a plane perpendicular to said central axis.
  • the two convergent parts of the lens can be connected to each other by means of an additional central part of the lens.
  • an elongated lens at each side of the array can direct the light radiation from the LEDs in a desired direction, and can converge the light beam, i.e. it makes the light beam less divergent, and can furthermore vary the light intensity of the light radiation in dependence upon the angle of the relevant light radiation with respect to a plane perpendicular to the central axes of the LEDs.
  • the cross-sectional curved shape of the outer surface of the lens is a conic.
  • the curved shape may be a part of a parabola or a circle, but is preferably substantially a part of an ellipse, with the radius of the ellipse decreasing further away from the longitudinal plane of symmetry of the lamp.
  • the outer surface of the lamp thus has no ribs or other unevennesses, so that it has the appearance of a tube-like lamp which can be cleaned easily. Furthermore, the lamp is more robust than, for example, a TL- tube, and it is more compact because a protecting cover is not required.
  • the inner surface of the lens may have any appropriate shape
  • the inner surface of the lens in a preferred embodiment has a predetermined shape including non- concave portions which, together with the convex curved outer surface of the lens, form the two convergent parts of the lens.
  • the expression 'non-concave' is herein understood to mean substantially flat or convex.
  • the LEDs as well as the lens are fixed to an elongated mounting member.
  • the mounting member and the lens, provided with appropriate end portions of the lamp, can form a closed housing for the LEDs.
  • the distance between every two neighboring LEDs in the array of LEDs is preferably more than 5 cm, preferably between 10 cm and 15 cm.
  • a distance provides an appropriate light radiation emitted by the lamp, i.e. a uniform light radiation throughout the length of the elongated lamp.
  • the invention also relates to an illumination system for illuminating merchandise in a cupboard freezer having at least one transparent door at its front side, wherein elongated lamps as described above are mounted behind the two vertical cheeks of the door, with the light beams of the lamps near both vertical edges of the door overlapping each other. This means that the merchandise in the freezer is illuminated by lamps at both sides of the transparent door.
  • the cupboard freezer has a plurality of neighboring transparent doors at its front side, wherein the elongated lamps are mounted behind at least three vertical cheeks of at least two neighboring doors. One elongated lamp then illuminates merchandise behind two neighboring transparent doors.
  • Fig. 1 shows a side-emitting LED and its light radiation through a lens
  • Fig. 2 is a sectional view of a lamp taken on the line II -II in Fig. 3;
  • Fig. 3 is a sectional view of the lamp taken on the line IH-III in Fig. 2;
  • Fig. 4 is a front view of a cupboard freezer
  • Fig. 5 is a sectional view taken on the line V-V in Fig. 4.
  • Fig. 1 shows a side-emitting LED 1 comprising a base 2 and an optical structure 3.
  • the light source 4 of the LED 1 is located in its central part.
  • the major part of the light radiation leaves the LED in lateral directions as indicated by the broken-line arrows in the Figure.
  • a part of the light radiation from the light source 4 leaves the optical structure 3 directly, and another part of the light radiation is reflected by a substantially conical mirror 5 of the optical structure 3 on top of the LED 1.
  • the side-emitting LED 1 is covered by an elongated lens 6 shown in Fig. 1 in a transverse cross-sectional view.
  • the outer surface 7 of the lens 6 is cylindrical, and the inner surface comprises two flat parts 8.
  • the two flat parts 8 of the inner surface and the cylindrical outer surface 7 form two convergent lens parts 9,10 at opposite sides of the LED 1.
  • the central plane of the elongated lens part 10 is indicated by a dot-and-dash line 11 in Fig. 1.
  • the light radiation from the LED 1 is converged by the lens parts 9,10 and redirected because the light source 4 of the LED 1 is located at a distance from the central plane 11 of the elongated lens part 10.
  • the broken-line arrows 12 and 13 represent radiation coming directly from the light source 4, and the broken- line arrow 14 represents radiation reflected by mirror 5 of the optical structure 3.
  • the direction of the light radiation emitted by the lamp can be adjusted, so that the intensity of the light radiation can vary in a predetermined radiation pattern.
  • Figs. 2 and 3 show schematically a lamp according to the invention.
  • FIG. 2 is a transverse cross-sectional view of the lamp
  • Fig. 3 is a longitudinal cross-sectional view. Only a part of the lamp is represented, including one of the two ends of the lamp.
  • the elongated lamp is provided with a plurality of side-emitting LEDs 21 mounted on a strip-like elongated mounting member 22.
  • An elongated lens 23 is fixed to the mounting member 22, for example, by means of glue.
  • the mounting member 22 has an upright portion 24, so that the LEDs 21 are located in an elongated, closed housing formed by the mounting member 22 and the lens 23.
  • the outer surface 25 of the lens 23 has the shape of half an ellipse, with the radius of curvature of the outer surface 25 decreasing further away from the longitudinal plane of symmetry of the lamp (the dot-and- dash line in Fig. 2).
  • the inner surface of the lens has four flat parts 26,27,28,29 for obtaining, in combination with the curved outer surface 25 of the lens, a predetermined distribution of the intensity of the light radiation emitted by the lamp.
  • the elongated lamp can be used for illuminating merchandise in a cupboard freezer, as shown in Figs. 4 and 5.
  • Fig. 4 shows the front side of the freezer
  • Fig. 5 is a horizontal sectional view, indicated by the arrows V in Fig. 4.
  • the freezer has a vertical back wall 31 and two vertical sidewalls 32. At its front side, it has four cheeks
  • the merchandise 41 inside a typical cupboard freezer is approachable by opening the doors 37,38,39 by means of handles 42, as shown for door 38 in Fig. 5 and indicated by arrow 43.
  • the merchandise 41 is exposed on shelves 44 which are carried by the sidewalls 32 and vertical partition walls 45.
  • the partition walls 45 do not extend to the front side of the cupboard interior, so that the temperature in the cupboard freezer as a whole can be controlled.
  • a plurality of elongated lamps 46 is mounted on the back of the door cheeks 33,34,35,36.
  • the light radiation from the lamps 46 illuminates the merchandise 41 evenly, with the light radiation towards the merchandise 41 in the middle of the shelves 44 being more intensive than the light radiation towards the merchandise 41 nearer to the lamps 46.
  • All merchandise 41, also the merchandise beyond the center of the shelves 44, is thus illuminated from two sides, thereby preventing inconvenient shadows in the cupboard freezer and ensuring optimal horizontal light uniformity.
  • One long lamp 46 may be mounted behind each door cheek 33,34,35,36, but an array of lamps 46 can also be mounted.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Freezers Or Refrigerated Showcases (AREA)

Abstract

L'invention porte sur une lampe allongée comprenant une pluralité de DEL (21) dans un seul réseau droit, une lentille allongée (23) s'étendant parallèle au réseau de DEL (21). Les DEL (21) et la lentille (23) ont un plan de symétrie longitudinal commun. Les DEL (21) sont des DEL émettant sur le côté et la lentille (23) comprend, en coupe transversale, deux parties convergentes au niveau des côtés opposés du réseau de DEL (21).
PCT/IB2008/052359 2007-06-21 2008-06-16 Lampe allongée comprenant une pluralité de del, et système d'éclairage WO2008155705A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07110733.8 2007-06-21
EP07110733 2007-06-21

Publications (1)

Publication Number Publication Date
WO2008155705A1 true WO2008155705A1 (fr) 2008-12-24

Family

ID=39830180

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/052359 WO2008155705A1 (fr) 2007-06-21 2008-06-16 Lampe allongée comprenant une pluralité de del, et système d'éclairage

Country Status (1)

Country Link
WO (1) WO2008155705A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2159524A1 (fr) * 2008-08-27 2010-03-03 Panasonic Corporation Réfrigérateur
CN102588788A (zh) * 2012-02-16 2012-07-18 南通恺誉照明科技有限公司 一种市电led模组
KR101299528B1 (ko) * 2012-12-18 2013-08-23 (주)애니캐스팅 측면 방출형 발광다이오드용 렌즈, 이를 구비하는 백라이트유닛 및 표시장치
US11525617B2 (en) * 2019-10-15 2022-12-13 Hill Phoenix, Inc. Systems and methods for defrost lighting in refrigerated cases

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020089842A1 (en) * 1992-04-08 2002-07-11 Santosuosso Joseph R. Display case with lens lighting system
US20050265019A1 (en) * 2004-05-26 2005-12-01 Gelcore Llc LED lighting systems for product display cases
US20060164833A1 (en) * 2005-01-26 2006-07-27 Pelka & Associates Cylindrical irradiance-mapping lens and its applications to LED shelf-lighting
US20060198144A1 (en) * 2005-03-07 2006-09-07 Nichia Corporation Planar light source and planar lighting apparatus
US20070171647A1 (en) * 2006-01-25 2007-07-26 Anthony, Inc. Control system for illuminated display case

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020089842A1 (en) * 1992-04-08 2002-07-11 Santosuosso Joseph R. Display case with lens lighting system
US20050265019A1 (en) * 2004-05-26 2005-12-01 Gelcore Llc LED lighting systems for product display cases
US20060164833A1 (en) * 2005-01-26 2006-07-27 Pelka & Associates Cylindrical irradiance-mapping lens and its applications to LED shelf-lighting
US20060198144A1 (en) * 2005-03-07 2006-09-07 Nichia Corporation Planar light source and planar lighting apparatus
US20070171647A1 (en) * 2006-01-25 2007-07-26 Anthony, Inc. Control system for illuminated display case

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2159524A1 (fr) * 2008-08-27 2010-03-03 Panasonic Corporation Réfrigérateur
WO2010023926A1 (fr) * 2008-08-27 2010-03-04 Panasonic Corporation Réfrigérateur
US7905614B2 (en) 2008-08-27 2011-03-15 Panasonic Corporation Refrigerator
CN102588788A (zh) * 2012-02-16 2012-07-18 南通恺誉照明科技有限公司 一种市电led模组
KR101299528B1 (ko) * 2012-12-18 2013-08-23 (주)애니캐스팅 측면 방출형 발광다이오드용 렌즈, 이를 구비하는 백라이트유닛 및 표시장치
WO2014098476A1 (fr) * 2012-12-18 2014-06-26 주식회사 애니캐스팅 Lentille pour diode électroluminescente du type à émission latérale, unité de rétro-éclairage et dispositif d'affichage la comportant
TWI509293B (zh) * 2012-12-18 2015-11-21 Anycasting Co Ltd 側出射型led透鏡、具有該透鏡的背光單元及顯示裝置
US9482854B2 (en) 2012-12-18 2016-11-01 Anycasting Co., Ltd. Side-emitting LED lens and backlight unit and display device having the same
US11525617B2 (en) * 2019-10-15 2022-12-13 Hill Phoenix, Inc. Systems and methods for defrost lighting in refrigerated cases

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