WO2023247372A1 - Lampe de bureau avec agencement de plaque de guidage de lumière - Google Patents

Lampe de bureau avec agencement de plaque de guidage de lumière Download PDF

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Publication number
WO2023247372A1
WO2023247372A1 PCT/EP2023/066302 EP2023066302W WO2023247372A1 WO 2023247372 A1 WO2023247372 A1 WO 2023247372A1 EP 2023066302 W EP2023066302 W EP 2023066302W WO 2023247372 A1 WO2023247372 A1 WO 2023247372A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
asymmetric
guide plate
light extraction
desk lamp
Prior art date
Application number
PCT/EP2023/066302
Other languages
English (en)
Inventor
Huajie LUO
Bo Cai
Di LOU
Huaizhou LIAO
Original Assignee
Signify Holding B.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 Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2023247372A1 publication Critical patent/WO2023247372A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F21S6/002—Table lamps, e.g. for ambient lighting
    • F21S6/003—Table lamps, e.g. for ambient lighting for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • 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]

Definitions

  • the present invention relates to the field of lighting, and in particular to the field of lighting for a desk or table.
  • LEDs light emitting diodes
  • pixilation This is commonly seen as an undesired or disturbing side-effect, and brings discomfort to a user.
  • Light guide plates are becoming increasingly used to help distribute light emitted by light emitting diodes, to effectively soften and/or de-pixelate emitted light.
  • desk lamp One use-case scenario for a light is a desk lamp.
  • a challenge of desk lamps is that they are necessarily compact, which provides only limited space for the light emitting elements. There is therefore a difficulty in providing optical designs that have a wide and uniform illumination of a desk.
  • a light guide plate arrangement for a desk lamp there is provided a light guide plate arrangement for a desk lamp.
  • the light guide plate arrangement comprises: a light guide plate for transmitting light, the light guide plate comprising: a light transmission window, configured to couple light transmitted by a light source into the light guide plate; and a light exit window configured to couple light out of the light guide plate, the light exit window making an angle of between 80° and 100° with respect to the light transmission window.
  • the light guide plate arrangement also comprises a first reflective surface positioned on the light guide plate and opposite the light transmission window for reflecting light incident upon the first reflective surface, wherein the light exit window is positioned between the light transmission window and the first reflective surface; a plurality of asymmetric light extraction features for directing light in the light guide plate towards the light exit window, wherein, for each asymmetric light extraction feature: in a first plane, being a plane parallel to the light exit window, the curvature of a first side of the asymmetric light extraction feature is greater than the curvature of a second side of the symmetric light extraction feature, wherein a longitudinal axis of the asymmetric light extraction feature makes a non-zero and non-perpendicular angle with respect to the light transmission window; and in a first plane, being a plane parallel to the light exit window, the curvature of a first side of the asymmetric light extraction feature is less than the curvature of a second side of the symmetric light extraction feature, wherein: the first side lies on one side of a
  • the present disclosure thereby proposes an approach in which the asymmetric light extraction features extend towards the light transmission window (and therefore light source) and away from the first reflective surface. This increases the amount of light that is guided, by the light guide plate, in a forward direction with respect to a direction in which light is transmitted into the light guide plate from the light source. This aids to improve the uniformity and spread of light distributed by the light guide plate.
  • the present disclosure also proposes to angle each asymmetric light extraction feature with respect to the light transmission window the light guide, and therefore the light source. This approach increases a sideways spread of the desk lamp.
  • Each asymmetric light extraction feature may be configured such that, in a second plane, being a plane perpendicular to the light exit window and perpendicular to the light transmission window, the curvature of the first side of the asymmetric light extraction feature is less than the curvature of the second side of the asymmetric light extraction feature.
  • the average gradient of the first side may be less than the average gradient of the second side.
  • This approach further enhances the effect of increasing the amount of light that is guided, by the light guide plate, in a forward direction with respect to a direction in which light is transmitted into the light guide plate from the light source.
  • the longitudinal axis makes an angle of between 10° and 50° with respect to the light transmission window. The angle would modify or affect the sideward light direction.
  • the plurality of asymmetric light extraction features comprises at least 20 asymmetric light extraction features. The greater the number of features, the greater the effect provided by the plurality of asymmetric light extraction features.
  • the at least 20 asymmetric light extraction features preferably comprises at least 50 asymmetric light extraction features, e.g., at least 100 asymmetric light extraction features.
  • the plurality of asymmetric light extraction features may be arranged in a pattern of two or more interwoven or overlapping columns. This approach increases the density of the asymmetric light extraction features, and therefore the effect provided by the asymmetric light extraction features.
  • Each of the plurality of asymmetric light extraction features may be formed from a hole or indentation in the light guide plate. This provides a mechanism for providing asymmetric light extraction features that is simple to manufacture, e.g., by modifying or etching existing molds for light guide plates.
  • each of the plurality of asymmetric light extraction features may be formed from a different material to the remainder of the light guide plate, i.e., a material having a different refractive index.
  • each of the plurality of asymmetric light extraction features is formed at a surface of the light guide plate opposite to the light exit window.
  • each of the plurality of asymmetric light extraction features has a surface roughness, Ra, of between 0.1pm and 20pm. This increases the amount of light scattered by the asymmetric light extraction features, and therefore the uniformity of light distributed by the light guide plate.
  • the light exit window may make an angle of between 85° and 95° with respect to the light transmission window.
  • the light exit window may be perpendicular to the light transmission window.
  • a lighting arrangement comprising: any herein described light guide plate arrangement; and the light source configured to transmit light towards the light transmission window.
  • the optical axis of the transmitted light e.g., the central axis, may be perpendicular to the light transmission window, e.g. be normal to the light transmission window.
  • a desk lamp comprising: a first lighting arrangement, being a herein described lighting arrangement; and a support for mounting the first lighting arrangement.
  • the desk lamp may further comprise a second lighting arrangement, being another lighting arrangement as herein described.
  • the support may be accordingly further configured to mount the second lighting arrangement.
  • the plurality of asymmetric light extraction features of the first lighting arrangement is a mirrored version of the plurality of asymmetric light extraction features of the second lighting arrangement.
  • the support may be configured, when positioned on a flat surface, to permit the first lighting arrangement and the second lighting arrangement (if present) to be positioned at a distance greater than 30cm from the flat surface.
  • Figure 1 provides an exploded view of a lighting arrangement using a 3D perspective
  • Figure 2 provides an assembled view of the lighting arrangement
  • Figure 3 provides a cross-sectional view of the lighting arrangement in an X-Y plane
  • Figure 4 illustrates an asymmetric light extraction feature in an X’-Y’ plane
  • Figure 5 provides a cross-sectional view of the lighting arrangement in a Y-Z plane
  • Figure 6 illustrates an asymmetric light extraction feature in a Y’-Z plane
  • Figure 7 illustrates the propagation of a first light ray through a lighting arrangement
  • Figure 8 illustrates the propagation of a second light ray through a lighting arrangement
  • Figure 9 illustrates a pattern for a plurality of asymmetric light extraction features
  • Figure 10 illustrates a desk lamp
  • Figure 11 illustrates a mirror symmetry for asymmetric light extraction features of two different lighting arrangements
  • Figure 12 provides an exploded view of a lighting arrangement.
  • the invention provides a lighting arrangement with a light guide plate having asymmetric light extraction features.
  • the asymmetric light extraction features bulge or extend towards a light transmission/entrance window/surface of the light guide plate, and are angled with respect to the light transmission window.
  • Embodiments are based on the realization that asymmetric light extraction features, i.e., light extraction features having an off-center optical axis, can aid in the control light emitted from a light guide plate of a desk lamp.
  • asymmetric light extraction features i.e., light extraction features having an off-center optical axis
  • the uniformity and spread of the light emitted by the light guide plate can be increased.
  • Figures 1 and 2 provide a 3D projection illustrating a lighting arrangement 50.
  • Figure 1 provides an exploded view and
  • Figure 2 provides an assembled view.
  • the lighting arrangement 50 comprises a light guide plate arrangement 100, itself an embodiment of the invention, and a light source 190.
  • Figure 1 identifies three axes for the lighting arrangement 50 and/or the light guide plate arrangement 100. These axes include an X-axis that spans a width of the light guide plate arrangement, a Y-axis that spans a length of the light guide plate arrangement, and a Z-axis that spans a height or depth of the light guide plate arrangement.
  • the light exit window 130 makes an angle of between 80° and 100° with respect to the light transmission window 110.
  • the light exit window may be substantially perpendicular or perpendicular to the light transmission window.
  • the light exit window may make an angle of between 85° and 95° with respect to the light transmission window.
  • the light exit window 130 is located on an underside of the illustrated lighting arrangement.
  • the first reflective surface 120 is positioned on the light guide plate 105 opposite the light transmission window 110.
  • the first reflective surface is configured to reflect light incident thereupon.
  • Approaches for forming a first reflective surface 120 include depositing a reflective material upon a surface of the light guide plate 105 and/or coupling a reflective layer/slice of material to a surface of the light guide plate 105.
  • the light source 190 is configured to transmit light towards the light transmission window 110.
  • the light source 190 may comprise one or more light emitting diodes for generating the light that is transmitted towards the light transmission window 110.
  • the light source 190 may be held in place by a printed circuit board.
  • the plurality of asymmetric light extraction features comprises at least 20 asymmetric light extraction features, e.g., no less than 100 asymmetric light extraction features, e.g., no less than 500 asymmetric light extraction features.
  • the first side 151 of the asymmetric light extraction feature lies on one side of the longitudinal axis.
  • the second side 152 of the asymmetric light extraction feature lies on the other side of the longitudinal axis.
  • Figure 5 provides a view of the light guide plate arrangement 100 in the Y-Z plane, which can be labelled a “second plane”. Only one asymmetric light extraction feature 150 is illustrated, the size of which has been exaggerated, for the purposes of illustrative clarity and explanation.
  • the asymmetric light extraction feature 150 is configured such that, in a second plane, being a plane perpendicular to the light exit window 130 and parallel to the light transmission window, the curvature of the first side 151 of the asymmetric light extraction feature 150 is less than the curvature of the second side 152 of the asymmetric light extraction feature 150.
  • the first side 151 may be (on average) less steep/inclined/sloped with respect to the light exit window than the second side 152.
  • Figure 6 provides an enlarged view of the asymmetric light extraction feature, with respect to a Y’-Z plane which lies in a same overall plane as the plane Y-Z, but with an axial rotation about the Z-axis.
  • Figure 6 illustrates how the asymmetric light extraction feature 150 may be shaped like a skewed hemi-circle, in which one side 151 of the feature has a lesser curvature than the other side 152 of the feature.
  • the first side 151 of the asymmetric light extraction feature 150 lies on one side of a second plane 510, being a plane perpendicular to the light exit window and passing through the longitudinal axis 159 of the asymmetric light extraction feature 150.
  • the second side 152 of the asymmetric light extraction feature 150 lies on the other side of the second plane.
  • optical axis of the asymmetric light extraction feature 150 is off-center, at least with respect to the first plane Y’-Z’.
  • the shape of the asymmetric light extraction feature 150 causes more light to be distributed towards the opposite side of the light guide plate to the light transmission window, i.e. increased the distribution of light to locations more distant from the light source.
  • Figures 7 and 8 illustrate the effect of the shape of the asymmetric light extraction feature 150, particularly one in which the (average) steepness of the first side 151 is less than the (average) steepness of the second side 152 (in the Y-Z plane).
  • Figure 7 illustrates a scenario in which a first light ray 710 is emitted from the light source 190 through the light transmission window 110 at an angle of 0i with respect to the normal Ni to the light transmission window.
  • the angle 0i is such that when the first light ray 710 reaches the interface between the asymmetric light extraction feature and the remainder of the light guide plate, the angle of incidence is greater than the critical angle for the interface.
  • the first light ray 710 is reflected towards the light exit window in a forward direction (i.e., in a direction having a positive component in the direction of a normal to the light transmission window reaching into the light guide plate).
  • Figure 8 illustrates a scenario in which a second light ray 810 is emitted from the light source 190 through the light transmission window 110 at an angle of 02 with respect to the normal to the light transmission window.
  • the angle 02 has an equal absolute value to the angle 0i, but opposite direction.
  • the second light ray 810 would also undergo total internal reflection at the interface to the asymmetric light extraction feature and be reflected towards the light exit window 130.
  • the second light ray 810 would be directed in a rearward direction with respect to the direction of light transmitted into the light guide plate 105.
  • the second light ray 810 is instead refracted into the asymmetric light extraction feature.
  • the desk lamp 10 comprises a first lighting arrangement 50A, as previously described, and a support 1010 for mounting the first lighting arrangement.
  • the desk lamp 10 further comprises a (optional) second lighting arrangement 50B, which the support 1010 is also configured to mount.
  • the support 1010 is configured to, when positioned on a flat surface 1090, prevent the distance d from being greater than Im In this way, the desk lamp can be specifically configured for use with desks.
  • Figure 12 provide an exploded view of a lighting arrangement 50, illustrating further optional features of the lighting arrangement.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne une lampe de bureau avec un agencement d'éclairage présentant une plaque de guidage de lumière ayant des éléments d'extraction de lumière asymétriques. Les éléments d'extraction de lumière asymétriques se gonflent ou s'étendent vers une fenêtre/surface de transmission/d'entrée de lumière de la plaque de guidage de lumière, et sont inclinés par rapport à la fenêtre de transmission de lumière.
PCT/EP2023/066302 2022-06-22 2023-06-16 Lampe de bureau avec agencement de plaque de guidage de lumière WO2023247372A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN2022100325 2022-06-22
CNPCT/CN2022/100325 2022-06-22
EP22193071 2022-08-31
EP22193071.2 2022-08-31

Publications (1)

Publication Number Publication Date
WO2023247372A1 true WO2023247372A1 (fr) 2023-12-28

Family

ID=86895851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/066302 WO2023247372A1 (fr) 2022-06-22 2023-06-16 Lampe de bureau avec agencement de plaque de guidage de lumière

Country Status (1)

Country Link
WO (1) WO2023247372A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070047254A1 (en) * 2005-08-27 2007-03-01 3M Innovative Properties Company Illumination assembly and system
US20100091520A1 (en) * 2008-10-15 2010-04-15 Super Liao Light Guide Plate and Backlight Module using the same
US20120099343A1 (en) * 2009-06-29 2012-04-26 3M Innovative Properties Company Lightguide and light source incorporating same
US20160131898A1 (en) * 2014-11-11 2016-05-12 Himax Display, Inc. Projection display apparatus
US20180113244A1 (en) * 2016-10-25 2018-04-26 Sergiy Vasylyev Shaped light guide illumination devices
US20200150333A1 (en) * 2018-11-12 2020-05-14 Sergiy Vasylyev Wide-area solid-state illumination devices and systems employing sheet-form light guides and method of making the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070047254A1 (en) * 2005-08-27 2007-03-01 3M Innovative Properties Company Illumination assembly and system
US20100091520A1 (en) * 2008-10-15 2010-04-15 Super Liao Light Guide Plate and Backlight Module using the same
US20120099343A1 (en) * 2009-06-29 2012-04-26 3M Innovative Properties Company Lightguide and light source incorporating same
US20160131898A1 (en) * 2014-11-11 2016-05-12 Himax Display, Inc. Projection display apparatus
US20180113244A1 (en) * 2016-10-25 2018-04-26 Sergiy Vasylyev Shaped light guide illumination devices
US20200150333A1 (en) * 2018-11-12 2020-05-14 Sergiy Vasylyev Wide-area solid-state illumination devices and systems employing sheet-form light guides and method of making the same

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