EP3045805A1 - Lumière stroboscopique colorée - Google Patents

Lumière stroboscopique colorée Download PDF

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Publication number
EP3045805A1
EP3045805A1 EP14196517.8A EP14196517A EP3045805A1 EP 3045805 A1 EP3045805 A1 EP 3045805A1 EP 14196517 A EP14196517 A EP 14196517A EP 3045805 A1 EP3045805 A1 EP 3045805A1
Authority
EP
European Patent Office
Prior art keywords
sheet
light
lighting fixture
led
housing
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.)
Withdrawn
Application number
EP14196517.8A
Other languages
German (de)
English (en)
Inventor
Nina Lillelund Kildeby
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.)
Harman Professional Denmark ApS
Original Assignee
Martin Professional ApS
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 Martin Professional ApS filed Critical Martin Professional ApS
Priority to EP14196517.8A priority Critical patent/EP3045805A1/fr
Publication of EP3045805A1 publication Critical patent/EP3045805A1/fr
Withdrawn legal-status Critical Current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
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/006—Controlling the distribution of the light emitted by adjustment of elements by means of optical elements, e.g. films, filters or screens, being rolled up around a roller
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • 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

  • Various embodiments relate to a lighting fixture, especially a strobe light which is able to emit strobe light in different colors.
  • a light emitting diode, LED is an electro-luminescent diode that includes a semiconducting material doped with an impurity to form a p-n junction. Materials for the LEDs can be selected in such a way that the light emitted by the LED has a particular color such as red, green or blue. LEDs have many advantages over conventional light sources, as the power consumption is lower, the lifetime is longer and the size is smaller.
  • two solutions are known. In one solution a red LED, a green LED and a blue LED are used and the light emissions are mixed generating a white light beam.
  • the second solution includes the use of a blue LED coated with a phosphor material so that the blue light emitted by the LED is converted by the phosphor material into a light with a longer wavelength.
  • the first approach can be used with the RGB LEDs in order to generate the white light.
  • the price of such a strobe light is due to the number of LEDs quite high compared to the output of the strobe light.
  • a strobe light comprising pure white LEDs is known giving the maximum output in the white colors. If other colors than white for the strobe light should be generated, the light is filtered. However, these color filters absorb light and, hence, lead to a lower output of the strobe light.
  • a lighting fixture comprising a housing and at least one LED provided in the housing, wherein the housing comprises a light exit opening for the light emitted by the at least one LED.
  • a scrolling assembly is provided comprising a first spool and a second spool and a sheet extending between the two spools. The scrolling assembly is configured to scroll the sheet from one of the spools to the other of the spools.
  • the sheet comprises different sections and each section contains a different phosphor composition, wherein the scrolling assembly is attached to the housing in such a way that the light of the at least one LED passing through the light exit opening passes through the sheet.
  • the lighting fixture has the advantage that there is no need to filter the light in order to generate different colors.
  • the different colors are generated by the different sections of the sheet, each section comprising a different phosphor composition resulting in a different light output.
  • the use of flexible thin phosphor sheets has become available.
  • the different sections of the sheet can be composed of the different phosphor sheets as described in WO 2014/124325 .
  • the lighting fixture operates as a strobe light.
  • the lighting fixture can also operate as a normal lighting fixture generating different colors without a strobe effect.
  • FIG. 1 shows a perspective view of a lighting fixture 10 including a housing 20.
  • a circuit board 30 with a plurality of LEDs 31 is provided, the LEDs 31 emitting preferably blue/violet light with a peak emission wavelength between 360 and 480 nm, preferably between 400 and 480 nm, and more preferably between 440 and 480 nm.
  • the LEDs 31 can also be configured to emit ultra-violate light such as UVA light having wavelengths between 320-380nm, UVB light having wavelengths between 280-320nm and UVC light having wavelengths between 185-280nm;
  • the circuit board 30 may be designed in such a way that each LED 31 can be controlled individually, especially can be turned on and off individually.
  • a large number of LEDs are provided in rows and columns.
  • the LEDs may also be electrically connected in series.
  • the circuit board 30 with the LEDs 31 is connected to the inside of housing 20 in a fixed position with fixing elements not shown in the figure.
  • the circuit board 30 and the LEDs 31 are arranged in such a way that the light emitted by the LEDs passes through a light exit opening 21 arranged opposite the upper surface of the circuit board 30.
  • the internal surfaces 22 and 23 of the housing may be designed as reflective surfaces so that the light of the LEDs 31 is reflected by the surfaces 22, 23 and can pass through the light exit opening 21. In fact it is possible to provide one or more reflectors configured to reflect the light from the LEDs 31 towards to sheet 50 and the surfaces 22, 23 may be configured to reflect the light towards the sheet.
  • the housing 20 is shown in the assembled state with the light exit opening 21.
  • the housing 20 is made of two different parts 20a and 20b which are mirror-symmetric to a plane defined where the two parts 20a and 20b meet.
  • the housing On the front surface 24, where the light exit opening 21 is provided, the housing comprising web sections 25 and 26 which define with their corresponding shape the shape of the light exit opening.
  • light exit opening is substantially rectangular in shape. However, it should be understood that other shapes of the light exit opening are possible.
  • the smaller the web sections are extending on the front surface the less light is reflected from the LED 31 to the interior of the housing.
  • the scrolling assembly is arranged in the front part of the housing 20.
  • the scrolling assembly comprises two spools 41 and 42, best seen in FIG. 4 .
  • a sheet 50 can be scrolled from one shaft 41 or 42 to the other of the shafts.
  • the sheet in the form of a strap is fixed at its two outer ends to the two spools 41 and 42 and the sheet can be wound and rewound from one spool to the other, the sheet extending across the gap defined between the two spools.
  • the width of the sheet in the direction perpendicular to the winding direction is such that the sheet fully covers the light exit opening.
  • the scrolling assembly comprises a motor 60 which is configured to drive the spools in such a way that the sheet can be wound and rewound from one spool to the other.
  • a manual actuating device 70 may be provided with which the motor (60) can be manually controlled.
  • an interface 61 may be provided at the motor with which control signals can be received from outside the lighting fixture in order to control the position of the sheet.
  • the scrolling assembly 40 is arranged inside the housing 20.
  • the scrolling assembly 40 may also be arranged outside housing 20. It may be connected to the housing 20 in such a way that the sheet 50 covers the light exit opening from the outside.
  • the connection of the scrolling assembly 40 to the outer surface of the housing 20 may be obtained by support structures not shown in the figures.
  • the sheet 50 comprises different sections 50a, 50b, and 50c, wherein each section of the sheet is sized such that the one section can fully cover the light exit opening 21.
  • the right and the left border 51 and 52 of one section are shown by the dashed lines.
  • the section 50b of the sheet 50 covers the complete light exit opening 21 shown in FIG. 4 .
  • each section 50 may comprise a yellow emitting phosphor or a blend of yellow and green emitting phosphor so that the light emitted by the sheet is white.
  • Each section of the sheet 50 may be a phosphor sheet as commercialized by PhosphorTech Corporation and as described in WO 2014/124325 .
  • Each section can be made of a substrate with a first layer of phosphor materials disposed on the surface of the substrate.
  • a single layer of the phosphor particles may be prepared by applying a layer of adhesive to a substrate followed by applying phosphor particles, wherein the phosphor particles stick to the adhesive layer in a uniform and dense layer upon contact.
  • the phosphor particles can be brushed or sprayed onto the adhesive surfaces until full coverage is achieved and no more phosphor particles would stick to the surface.
  • the different sections now differ from one another in that one section 50b is coated with one kind of phosphor particles so that a first color is emitted by the sheet, whereas a neighboring sheet has a different phosphor composition so that another color is emitted by the phosphor sheet when the blue/violet LEDs 31 emit light.
  • the sheet is flexible and has a thickness between 50 and 500 ⁇ m so that it can be wound and unwound on the spools 41 and 42.
  • the lighting fixture 10 can now generate different colors by scrolling the sheet in such a way that one particular section 50a, 50b, or 50c is located in front of the light exit opening.
  • the scrolling assembly with motor 60 is designed in such a way that the motor knows which section 50a to 50c is located in front of the light exit opening.
  • the motor 60 may have a memory in which the position of the different sections 50a to 50c in the sheet is known.
  • each section may have a marker 55 indicating to the motor which phosphor material is provided on the corresponding section so that the motor knows which light will be emitted by the lighting fixture.
  • the motor may be configured to count the longitudinal position of the sheet between the two spools so that in dependence of the two end positions of the sheet relative to the spools, it is known where each section of the sheet is located.
  • the motor may be able to determine how the two spools 41 and 42 have to be rotated in order to place a certain section of the sheet in front of the light exit opening.
  • one section of the sheet here section 50a, comprises a cutout 56, wherein no sheet is provided, section 50a being held in position by the two webs 57, 58, which connect the section where the cutout is provided with the neighboring sections.
  • the cutout 56 is dimensioned such that, when the cutout is located in front of the light exit opening, no sheet is located between the LEDs and the light exit opening.
  • the light emitted by lighting fixture 10 has the color of the light as emitted by the LEDs. If the LEDs are blue LEDs, then the lighting fixture emits blue light.
  • one of the sections of the sheet comprises areas comprises a number of sub-sections where each sub-section comprises different phosphor compositions.
  • each sub-section comprises different phosphor compositions.
  • the relatively size of the sub-sections can be varies in order to change the ratio between the different colours generated by the different phosphor material.
  • the different subsections can be formed in predefined patterns whereby the sheet also can be used to generate graphical patterns such as images or logos.
  • the light fixture may be driven in a viewing mode where the LEDs provide a lower light output to the phosphor sheet whereby an audience may be we able to observe the phosphor sheet directly.
  • the light fixture also can create strobe light using such section.
  • FIG. 6 shows another example of a lighting fixture.
  • the lighting fixture with the LEDs 31 and the phosphor sheet additionally comprises first light collecting elements 61a and 61b. These light collecting elements are arranged in such a way that each first light collecting element collects the light emitted by one or several LEDs and directs the light in direction of the sheet 50. The light emitted by each of the LEDs is emitted in substantially 180° to the space above the circuit board 30.
  • the first light collecting elements 61a and 61b help to guide the light emitted by the LEDs in direction of the sheet so that the amount of light passing through the sheet 50 is increased.
  • the first light collecting elements 61a and 61b may be designed as TIR (Total Internal Reflection lenses) lenses, regular optical lenses, light mixing rods, or regular reflectors. In the embodiment shown, one first light collecting element is provided for each LED. However, it should be understood that also one first light collecting element may be provided for more than one LED.
  • TIR Total Internal Reflection lenses
  • second light collecting elements 62a and 62b can be provided to collect the light emitted by the phosphor sheet 50. As indicated by the arrows in the sheet 50, the light emitted by the phosphor sheet is directed into different directions.
  • the light collecting elements 62a and 62b help to further direct the light beam or light beams emitted by the lighting fixture. With the use of the second light collecting elements, more focussed light beams such as light beams 65 and 66 are obtained.
  • the second light collecting elements 62a, 62b may be designed as light mixing rods in which the light entering the light mixing rod is reflected at the internal surface and thus generates a more focussed and homogenous light beam.
  • the second light collecting elements can be provided as TIR (Total Internal Reflection lenses) lenses, regular optical lenses, or regular reflectors. It should be understood that only one of the light collecting elements may be provided, either the first light collecting elements 61a and 61b or the second light collecting elements 62a and 62b.
  • TIR Total Internal Reflection lenses
  • regular optical lenses regular reflectors. It should be understood that only one of the light collecting elements may be provided, either the first light collecting elements 61a and 61b or the second light collecting elements 62a and 62b.
  • FIG. 7 shows an embodiment in which only the first light collecting elements 61 are provided such as the three first light collecting elements 61a-61c. Furthermore, the scrolling assembly with the phosphor sheet 50 is arranged at a distance such that each of the first light collecting elements, e.g. the TIR lenses generate light beams 70a-70c which are more focused than if the light were directly emitted from the LED 31 to this sheet 50 without providing the light elements 61a-61c.
  • the first light collecting elements e.g. the TIR lenses generate light beams 70a-70c which are more focused than if the light were directly emitted from the LED 31 to this sheet 50 without providing the light elements 61a-61c.
  • three of the LEDs 31 are shown together with three first light collecting elements. However, it should be understood that any number of LEDs may be used and that one first light collecting element may be provided for each LED.
  • one first light collecting element such as elements 61a-61c is provided for a group of LEDs.
  • the light emitted by the phosphor sheet 50 is then emitted in substantially 180° to the direction opposite to the space where the LEDs are located as symbolized in FIG. 7 by the arrows 71.
  • FIG. 8 shows a further embodiment in which the components present in FIG. 7 are also present.
  • an additional lens 80 is provided to collect the light emitted by the phosphor sheet 50.
  • This lens may be a Fresnel lens which collects the light emitted by the phosphor sheet so that a light beam 81 is obtained which is more focused than the light beam emitted in the embodiment of FIG. 7 , where no light collecting element is used after the sheet 50.
  • the optical systems shown in FIG. 6 to 8 do not indicate the housing 20.
  • the housing 20 may be arranged relative to the lenses shown in FIG. 6 to 8 in such a way that all the optical elements shown in FIG. 6 to 8 are provided inside the housing or at least at the light exit opening, however, the light exit opening may also be provided directly before or after the phosphor sheet 50 so that the second light collecting elements such as the elements 62 or the Fresnel lens 80 are located directly on the housing at the light exit opening.
  • the second light collecting elements or the Fresnel lens 80 may also be located outside the housing, e.g. when the phosphor sheet 50 is also attached to the outside of the housing.
  • the sheet may be kept temporarily in front of the light exit opening until it is decided to change the color of the lighting fixture.
  • the sheet with the different sections may be continuously scrolled so that a light effect with continuously changing colors is obtained.
  • the lighting fixture is operating as a strobe light. In another embodiment, however, the lighting fixture may be used as a continuously light emitting lighting fixture.
  • a lighting fixture which can generate different colors with a high light output.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP14196517.8A 2014-12-05 2014-12-05 Lumière stroboscopique colorée Withdrawn EP3045805A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14196517.8A EP3045805A1 (fr) 2014-12-05 2014-12-05 Lumière stroboscopique colorée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14196517.8A EP3045805A1 (fr) 2014-12-05 2014-12-05 Lumière stroboscopique colorée

Publications (1)

Publication Number Publication Date
EP3045805A1 true EP3045805A1 (fr) 2016-07-20

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EP14196517.8A Withdrawn EP3045805A1 (fr) 2014-12-05 2014-12-05 Lumière stroboscopique colorée

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EP (1) EP3045805A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050099317A1 (en) * 1999-08-04 2005-05-12 Pederson John C. Led light bar
US20050201109A1 (en) * 2004-03-10 2005-09-15 Citizen Electronics Co. Ltd. Lighting apparatus
US20060163502A1 (en) * 2005-01-26 2006-07-27 Newsome Donald E Ultraviolet light with polymer conversion sheets
US20100182766A1 (en) * 2009-01-16 2010-07-22 Foxsemicon Integrated Technology, Inc. Illumination device with flexible light transmissive film
DE102011112285A1 (de) * 2011-09-05 2013-03-07 Schott Ag Lichtformung mittels LED-Lichtquelle
WO2014124325A1 (fr) 2013-02-09 2014-08-14 Phosphortech Corporation Feuilles de luminophore
US20140307444A1 (en) * 2011-07-14 2014-10-16 Bronislav Vladislavovich Gorlinskiy Light-emitting diode lamp

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050099317A1 (en) * 1999-08-04 2005-05-12 Pederson John C. Led light bar
US20050201109A1 (en) * 2004-03-10 2005-09-15 Citizen Electronics Co. Ltd. Lighting apparatus
US20060163502A1 (en) * 2005-01-26 2006-07-27 Newsome Donald E Ultraviolet light with polymer conversion sheets
US20100182766A1 (en) * 2009-01-16 2010-07-22 Foxsemicon Integrated Technology, Inc. Illumination device with flexible light transmissive film
US20140307444A1 (en) * 2011-07-14 2014-10-16 Bronislav Vladislavovich Gorlinskiy Light-emitting diode lamp
DE102011112285A1 (de) * 2011-09-05 2013-03-07 Schott Ag Lichtformung mittels LED-Lichtquelle
WO2014124325A1 (fr) 2013-02-09 2014-08-14 Phosphortech Corporation Feuilles de luminophore

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