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
• • 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
  • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
• • 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
  • F21V5/08—Refractors for light sources producing an asymmetric light distribution
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
  • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
  • F21K9/20—Light sources comprising attachment means
  • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
  • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• • 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
  • F21Y2113/00—Combination of light sources
  • F21Y2113/10—Combination of light sources of different colours
  • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
• • 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 invention relates to a light emitting device comprising an array of light emitting elements configured to, in operation, emit light in a main direction of emission, and an array of lenses arranged to cover at least a part of the array of light emitting elements, where each lens of the array of lenses are arranged such as to cover a light emitting element of the array of light emitting elements.
• the invention further relates to a luminaire or a lamp comprising such a light emitting device.
• 2D color gradient is intended to refer to a color gradient being present in two mutually different directions simultaneously when seen on a target surface.
• US 2019/326350 Al discloses a source sensitive optic that uses reconfigurable chip-on-board (CoB) light emitting diode (LED) arrays as light sources.
• the reconfigurable CoB LED array includes a predetermined number of LEDs that are configurable for a variety of illumination scenarios.
• the reconfigurable CoB LED array may be multiple CoB LED arrays that are configured for use with the source sensitive optic.
• the source sensitive optic includes surface shapes that are responsive to the reconfigurable CoB LED array.
• the source sensitive optic is configured to provide beam profile and radiation pattern differentiation based on a CoB LED array configuration configured from the reconfigurable CoB LED. Each configurable CoB LED array configuration radiates a different beam pattern via the surface shapes due to proximity and surface shape geometries.
• the array of lenses comprises a first plurality of lenses configured to cause the light emitted by the light emitting element to be directed in a first direction being different from the main direction of emission, and a second plurality of lenses configured to cause the light emitted by the light emitting element to be directed in a second direction being different from the main direction of emission, wherein the first direction is different from the second direction, a light emitting device is provided with which it becomes possible to create two different color gradients simultaneously, when seen on a target surface such as a wall or a ceiling.
• such a light emitting device enables using a ID or 2D array of light emitting elements to create a light output with a 2D color gradient.
• the target surface is situated in a distance of 0.5 to 1 m from the light emitting device.
• the lenses of the first plurality of lenses and the lenses of the second plurality of lenses may be arranged altematingly in the array of lenses.
• the lenses of the first plurality of lenses and the lenses of the second plurality of lenses may comprise mutually different surface profiles.
• the first plurality of lenses may be freeform lenses configured to collimate the light emitted by the light emitting element, and the second plurality of lenses may be freeform lenses configured to comprise a peanut shape.
• the second plurality of lenses may be configured to direct a major part of the light emitted by the light emitting element in a beam angle of between 40 and 65 degrees with respect to the main direction of emission.
• the first plurality of lenses may be configured to provide the light emitted by the light emitting element with a first beam angle
• the second plurality of lenses may be configured to provide the light emitted by the light emitting element with a second beam angle
• the first beam angle is smaller than the second beam angle
• the first beam angle may be smaller than the second beam angle by at least 2 x 10 degrees, or by at least 2 x 15 degrees, or by at least 2 x 20 degrees.
• the first beam angle may be 2 x 45 degrees or 2 x 50 degrees or 2 x 55 degrees
• the second beam angle may be 2 x 60 degrees or 2 x 65 degrees or 2 x 70 degrees.
• Such values for and/or relations between the respective beam angles have been shown to be particularly suitable for creating a light output with a well-defined a 2D color gradient in the typical use situation, where the target surface is situated in a distance of 0.5 to 1 m from the light emitting device.
• the light emitted by the light emitting elements of the array of light emitting elements may comprise a variable color spectrum.
• the light emitted by the light emitting elements covered by the first plurality of lenses may be provided with a first color spectrum
• the light emitted by the light emitting elements covered by the second plurality of lenses may be provided with a second color spectrum
• the first color spectrum is different from the second color spectrum
• the first color spectrum may for instance be different from the second color spectrum in terms of color, luminance or a combination thereof.
• the difference between the first color spectrum and the second color spectrum may be expressed in terms of the measurement delta E or AE, which is a standard measurement that quantifies the difference between two colors that appear on a screen or a target surface.
• AE levels are the difference between the displayed color and the original color standard of the input content. A lower AE indicates a smaller difference, while higher AE levels indicate a greater difference.
• AE values are expressed on a scale from 0, being no difference, to 100 meaning exact opposite colors (e.g., black and white or red and green). In the present case AE thus quantifies the difference between the first color spectrum and the second color spectrum as appearing on a target surface.
• the light emitting device may further comprise a controller configured to individually control the color spectrum of the light emitted by the light emitting elements of the array of light emitting elements.
• the array of light emitting elements and the array of lenses may be arranged on a substrate.
• the array of light emitting elements may form a LED strip.
• the array of light emitting elements may be a two-dimensional array of light emitting elements.
• the light emitting device may further comprise a diffuser plate arranged above the array of light emitting elements.
• the light emitting device may further comprise a housing in which the array of light emitting elements and the array of lenses are arranged. Thereby, the light emitting elements and the array of lenses are effectively protected against external influences, such as dust.
• the invention further relates to a luminaire comprising at least one light emitting device according to any one of the above claims.
• Fig. 1 illustrates a light pattern of a prior art light emitting device as seen on a target surface.
• Fig. 2 shows a perspective view of a light emitting device according to the invention.
• Fig. 3 shows a perspective view of an enlarged section of the light emitting device according to Fig. 2.
• Fig. 4 shows a cross-sectional view of a section of the light emitting device according to Fig. 2 as seen in the plane IV shown in Fig. 3.
• Fig. 5 illustrates a light pattern of a light emitting device according to the invention as seen on a target surface.
• Fig. 6 shows a simulation of the illuminance and color of the light emitted by a light emitting device according to the invention as seen on a target surface, illustrating that uniform color strips may be made with a light emitting device according to the invention.
• Fig. 7 shows a simulation of the illuminance and color of the light emitted by a light emitting device according to the invention as seen on a target surface, illustrating that multiple gradients vertically and horizontally may be made with a light emitting device according to the invention.
• Fig. 8 shows a schematic cross-sectional view of a luminaire comprising a light emitting device according to the invention.
• the light emitting device 1 generally comprises an array of light emitting elements 2 and an array of lenses 3.
• the array of light emitting elements 2 is configured to, in operation, emit light in a main direction of emission M, cf. Fig. 4.
• the light emitting elements 21, 22 of the array of light emitting elements 2 may be configured to emit light with a variable color spectrum.
• the array of light emitting elements 2 may be a one-dimensional (ID) array as shown on Fig. 1.
• the array of light emitting elements 2 may be a two-dimensional (2D) array. In the former case, the array of light emitting elements 2 may form a LED strip. In the latter case any size of array is in principle feasible.
• the light emitting device 1 is configured to, in operation, provide a light output.
• the light output of the light emitting device 1 is the combination of the light emitted by all light emitting elements of the array of light emitting elements 2.
• the array of lenses 3 is arranged to cover at least a part of the array of light emitting elements 2.
• Each lens of the array of lenses 3 is arranged such as to cover a light emitting element of the array of light emitting elements 2.
• Each lens of the array of lenses 3 is a freeform lens.
• the array of lenses 3 comprises a first plurality of lenses 31 configured to cause the light emitted by the light emitting element 2 covered by the lens 31 to be directed in a first direction DI, cf. Figs. 3 and 4.
• the first direction DI is different from the main direction of emission M.
• the lenses of the first plurality of lenses 31 comprise a first surface profile 33, cf. Fig. 4.
• the first plurality of lenses 31 may be freeform lenses configured to collimate the light emitted by the light emitting element 2 covered by a lens of the first plurality of lenses 31.
• the first plurality of lenses 31 are configured to provide the light emitted by the light emitting element with a first beam angle Al, cf. Fig. 4.
• the first beam angle Al may be 2 x 45 degrees or 2 x 50 degrees or 2 x 55 degrees.
• Some light emitting elements 21 of the array of light emitting elements 2 are covered by a lens of the first plurality of lenses 31.
• the light emitted by the light emitting elements 21 covered by the first plurality of lenses 31 may be provided with a first color spectrum.
• the array of lenses 3 further comprises a second plurality of lenses 32 configured to cause the light emitted by the light emitting element 2 covered by the lens 32 to be directed in a second direction D2, cf. Figs. 3 and 4.
• the second direction D2 is different from the main direction of emission M. Further, the second direction D2 is different from the first direction DI.
• the lenses of the second plurality of lenses 32 comprise a second surface profile 34, cf. Fig. 4.
• the second surface profile 34 is different from the first surface profile 33.
• the second plurality of lenses 32 may be freeform lenses configured to comprise a peanut shape.
• the second plurality of lenses are configured to direct a major part of the light emitted by the light emitting element in a second beam angle A2, cf. Fig. 4.
• the second beam angle A2 may be between 40 and 65 degrees with respect to the main direction of emission M.
• the second beam angle A2 may be 2 x 60 degrees or 2 x 65 degrees or 2 x 70 degrees.
• Some light emitting elements 22 of the array of light emitting elements 2 are covered by a lens of the second plurality of lenses 32.
• the light emitted by the light emitting elements 22 covered by the second plurality of lenses 32 may be provided with a second color spectrum.
• the second color spectrum is different from the first color spectrum.
• the lenses of the first plurality of lenses 31 and the lenses of the second plurality of lenses 32 are as shown on Fig. 3 arranged alternatingly in the array of lenses 3.
• the light emitting device 1 may further optionally comprise a controller 7.
• the controller 7 is configured to individually control the light emitting elements of the array of light emitting elements 2, and especially to individually control the color spectrum of the light emitted by the light emitting elements of the array of light emitting elements 2.
• the array of light emitting elements 2 and the array of lenses 3 may optionally be arranged on a substrate 4.
• the substrate 4 may for instance be a printed circuit board.
• the substrate 4 may comprise electrical wiring configured to provide the light emitting elements 2 with electrical energy.
• the substrate 4 may further comprise a connection element configured to connect the electrical wiring to a source of electrical energy, such as mains.
• the light emitting device 1 may further optionally comprise a diffuser plate 6.
• the diffuser plate 6 is arranged above the array of light emitting elements 2.
• the diffuser plate 6 may be arranged at or form a light exit surface of the light emitting device 1.
• the diffuser plate 6 may comprise one or more of light outcoupling structures and diffractive structures.
• the first type of lenses 31 of the array of lenses 3 are freeform lenses which collimate the light from the light emitting elements 21 in the straightforward direction to obtain a beam angle Al of 2 x 50 degrees.
• the second type of lenses 32 of the array of lenses 3 are freeform lenses with a peanut shape configured to collimate the light from the light emitting elements 22 in outward directions to obtain a beam angle A2 of 2 x 65 degrees, where most light is directed within a beam angle A2 of 40-65 degrees.
• Fig. 6 shows a simulation of the illuminance and color of the light emitted by a light emitting device 1 according to the invention and as described in connection with Fig. 5 above as seen on the target surface.
• Fig. 6 illustrates that uniform color strips may be made with a light emitting device 1 according to the invention.
• a color gradient is introduced to the light emitted by the light emitting elements 21 and 22, respectively, underneath both types of lenses, such as for example green to red for the light emitted by the light emitting elements 22 underneath the second type lenses 32 and blue to green for the light emitted by the light emitting elements 21 underneath the first type of lenses 31.
• a 2D variation in color may be obtained.
• a light emitting device 1 working as a uniform color strip is provided for.
• Fig. 7 shows a simulation of the illuminance and color of the light emitted by a light emitting device 1 according to the invention and as described in connection with Fig. 5 above as seen on the target surface.
• Fig. 7 illustrates that it is also possible to obtain multiple gradients vertically and horizontally (cf. G1 and G2 in Fig. 5) with a light emitting device 1 according to the invention.
• a 2D color gradient that is a color gradient G1 and G2, respectively, in two mutually different, here orthogonal, directions, is obtained.
• Figs. 6 and 7 are black and white reproductions that are in reality full-color results of the simulations. For instance, in Fig. 7 the reality is that from top to bottom the color gradient goes from green via cyan to blue.
• Fig. 8 shows an exemplary luminaire or lamp 12 comprising a light emitting device 1 according to any embodiment of the invention.
• the light emitting device 1 may in this case be configured or formed as a substantially straight LED filament.
• the light emitting device 1 of such a lamp may in other embodiments be a LED filament with another shape, such as, but not limited to, spiral-shaped, helix-shaped, meandering, twisted, flat and combinations thereof.
• the light emitting device 1 does not comprise any housing 5 or diffuser plate 6.
• the lamp 12 further comprises a driver or controller 17 configured for controlling the array of light emitting elements 2 of the light emitting device 1.
• the controller 17 is configured to power the array of light emitting elements 2 via electrical circuitry of the light emitting device 1.
• the controller 17 may further be configured for controlling at least one of the CCT of the light emitted by the light emitting device and the CRI of the light emitted by the light emitting device.
• the controller 17 may also be configured for controlling other parameters related to the array of light emitting elements 2 and the light emitted by the light emitting device.
• the lamp 12 further comprises an envelope 13 at least partially enveloping the at least one light emitting device 1.
• the lamp 12 further comprises a cap 14.
• the controller 17 is arranged within the envelope 13. When comprising a cap 14, the controller 17 may also be arranged inside the cap 14 such that it is hidden from view.
• the lamp 12 further comprises threading 15 for connection to a socket and a terminal 16 for connection to a source of electrical energy.
• the envelope 13 of the lamp 12 may further and optionally be provided with a coating 18, such as a reflective coating or a diffusive coating, covering at least a part of the envelope 13.
• a coating 18, such as a reflective coating or a diffusive coating covering at least a part of the envelope 13.
• the luminaire or lamp 12 shown in Fig. 8 is only one example of a luminaire according to the invention. Any suitable type of luminaire may be envisaged, such as but not limited to, a luminaire shaped as a light strip or a luminaire being square shaped.
• the light emitting device 1 may comprise an array of light emitting elements 2, which may be configured or formed as a one-dimensional array of light emitting elements 2.
• the light emitting device 1 may comprise an array of light emitting elements 2, which may be configured or formed as a two-dimensional array of light emitting elements 2.
• Luminaires or lamps in the form of a pendant, a standing luminaire, a wall mounted luminaire, a ceiling mounted luminaire, a chandelier, a reading luminaire, an outdoor luminaire and a table luminaire are also feasible.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

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Publications (1)

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Family Applications (1)

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Citations (6)

• 2024
  • 2024-05-30 CN CN202480037611.5A patent/CN121336070A/zh active Pending
  • 2024-05-30 WO PCT/EP2024/064963 patent/WO2024251612A1/en not_active Ceased
  • 2024-05-30 EP EP24728643.8A patent/EP4724732A1/en active Pending

Patent Citations (6)

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