EP4043782A1 - Optisches element, leuchte und beleuchtungssystem - Google Patents

Optisches element, leuchte und beleuchtungssystem Download PDF

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Publication number
EP4043782A1
EP4043782A1 EP21290007.0A EP21290007A EP4043782A1 EP 4043782 A1 EP4043782 A1 EP 4043782A1 EP 21290007 A EP21290007 A EP 21290007A EP 4043782 A1 EP4043782 A1 EP 4043782A1
Authority
EP
European Patent Office
Prior art keywords
geometric
optical element
plane
cavity
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.)
Pending
Application number
EP21290007.0A
Other languages
English (en)
French (fr)
Inventor
Maxime Perdu
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.)
Zg Lighting France S A S
ZG Lighting France SAS
Original Assignee
Zg Lighting France S A S
ZG Lighting France SAS
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 Zg Lighting France S A S, ZG Lighting France SAS filed Critical Zg Lighting France S A S
Priority to EP21290007.0A priority Critical patent/EP4043782A1/de
Publication of EP4043782A1 publication Critical patent/EP4043782A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • 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
    • 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
    • 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
    • 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
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • 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 is directed to an optical element for controlling a light distribution pattern of a light source, a luminaire, like a street light, comprising said optical element and a light source, and a lighting system comprising the luminaire and a post for carrying the luminaire at a location of operation.
  • light sources emit their light upon operation over a wide range. For many lighting purposes it is required to direct the light into a particular direction or range. This can be done by blocking the light emission directions which are not required. For increase of lighting efficiency it is known to redirect light being emitted in a non-desired direction towards a desired light emission direction. Therefore, reflectors can be used to redirect the light to the desired direction. Redirection of light may also be obtained by total internal reflection (TIR) particularly in cases where optical elements like lenses are used for light control.
  • TIR total internal reflection
  • luminaires using lenses to emit light in a main (e.g. forward) direction are, for instance, street lights which are usually fixed at a raised position and intended to emit most of their light to a downward direction with respect to a horizontal plane.
  • street lights which are usually fixed at a raised position and intended to emit most of their light to a downward direction with respect to a horizontal plane.
  • It is also required to emit the light sidewards - i.e. along a direction along the street - preferably to obtain a continuous combined light pattern of neighboring luminaires; e.g. along the street.
  • Fig. 1 shows an example for light distribution of a known street light luminaire.
  • the light distribution pattern is generally designed to emit light as good as possible across the street and at the same time as far as possible along the street.
  • the frame indicated as TTA shows a typical area where the light from optical elements using the TIR function of backlight is reflected to.
  • Such optical elements often use cavities in the lens body to provide surfaces which allow TIR function. These surfaces usually have a horizontal cross section extending linearly while having a slightly curved layout in a vertical direction to allow for the TIR function.
  • the surface may further be structured to increase the distribution pattern. These diffused or scattered functions, however, do not allow a fine controlled reflection.
  • the TIR function may also be combined with a second control stage at a complex designed outer surface of the lens, which results in increased dimensions of the optical element and further complicate the lens production.
  • the present invention is directed to an optical device for controlling a light distribution pattern of a light source radiating first light beams to a first geometric quarter-space and second light beams to a second geometric quarter-space.
  • the first and second geometric quarter-spaces are defined by mutually perpendicular first and second geometric planes so that the first geometric plane constitutes a boundary between the first and second geometric quarter-spaces.
  • the optical element is made of a transparent piece.
  • the optical element comprises a first cavity for receiving the light source, a second cavity, and a lens-section.
  • the second cavity is delimited by a reflection surface of the transparent piece preferably towards the first cavity for controlling at least part of the second light beams by reflecting the at least part of the second light beams to the first geometric quarter-space.
  • the lens-section of the transparent piece at least partially borders the first cavity for acting as a lens for controlling a light distribution pattern of the first light beams.
  • the reflection surface has an arcuate contour in a sectional view with a sectional plane being perpendicular to the first and second geometric planes and when viewed parallel to the first and second geometric planes.
  • the reflection surface has a wing shaped contour in a sectional view with a sectional plane parallel to the second geometric plane and when viewed orthogonally to the second geometric plane.
  • the wing shaped contour comprises a central convex section protruding towards the first cavity or the first geometric plane, and, at each side of the central convex section along the first geometric plane, a concave section which is bulged away from the first cavity or the first geometric plane, so that a total internal reflection takes place at the reflection surface when the at least part of the second light beams arrive, from inside the transparent piece, at the reflection surface.
  • the reflective surface shaped in a way as described allows for a fine three-dimensional variation in the TIR function to thus provide a combination of free form shapes to accurately control the light distribution pattern in a manner to lead the reflected light in any desired direction and particularly in most efficient areas as desired.
  • This allows for any back light (i.e. second light beams) to be controlled more easily and more efficiently which may result in a power reduction by increasing the utilization factor so that less flux is needed to reach the minimal lighting level.
  • the optical element thus allows for energy saving in particular for long term installations such as outdoor luminaires. As mentioned, this can be obtained by defining the shape of the reflection surface to thus adapt the light distribution pattern accurately, e.g. for wide areas or narrow streets or the like. Also, lateral spread of the light to both sides (i.e.
  • a control in a desired Cmax plane can be easily and accurately obtained by the defined contour of the reflective surface resulting in a corresponding free form shape to lead the reflected light in a desired and/or most efficient area.
  • the first cavity and the second cavity may be separated by a wall of the transparent piece comprising the reflection surface.
  • a wall of the transparent piece comprising the reflection surface.
  • Providing only a single wall between these two cavities results in a comparably simple structure of the optical element and thus simplified production thereof.
  • this wall allows for an easy and efficient light control towards the reflection surface.
  • the reflection surface is provided by this wall, provision of the reflection surface and thus the structure of the transparent piece can be simplified as well.
  • the reflection surface preferably has a saddle-shaped contour. Such a three-dimensional contour allows for smooth transitions over the whole surface as well as a highly accurate control of the light reflection.
  • the arcuate contour preferably becomes more distant form the first geometric plane with increased distance from the second geometric plane. This allows for an easy control of the light, e.g., a fine control of the light distribution regarding a desired gamma angle.
  • tangents of the arcuate contour and a normal of the second geometric plane, respectively enclose an angle a, which becomes smaller with increased distance from the second geometric plane.
  • the arcuate contour preferably has a parabolic or at least partially parabolic form, like a half parabolic form. This smooth contour allows for an easy production of the lens, easy control of the TIR function and thus accurate and efficient lighting control.
  • the concave sections each have an apex between the central convex section and a most distant end of the concave section with respect to the convex section.
  • a tangent of the concave section first encloses an increasing angle with respect to the second geometric plane which then decreases again and becomes negative.
  • the concave section may have an arc-shape. This shape of the concave sections allow for a fine control of the light distribution and even allows for a fine control of back light being emitted closer to the Co and C180 planes with reference to Fig. 1B .
  • the optical element or at least its reflection surface can be substantially symmetric with respect to a third geometric plane perpendicular to the first and second geometric planes.
  • the third geometric plane may preferably cross the central convex section.
  • the optical element may further comprise a second lens-section of the transparent piece, preferably at least partially bordering the second cavity, for acting as a lens for further controlling the light distribution pattern of the at least part of second light beams after being reflected by the reflection surface.
  • a second lens-section of the transparent piece preferably at least partially bordering the second cavity, for acting as a lens for further controlling the light distribution pattern of the at least part of second light beams after being reflected by the reflection surface.
  • the light output section of the transparent piece i.e. its outer surface, may also be used and designed, e.g. for a kind of fine tuning the light output, to thus increase accuracy of the light distribution pattern.
  • the second lens-section may comprise an outer bordering surface of the transparent piece having, in a sectional view with a sectional plane being perpendicular to the first and second geometric plane and when viewed parallel to the first and second geometric planes, an angled and/or curved contour.
  • the angled and/or curved contour can preferably be slanted towards the first geometric quarter-space.
  • tangents of the angled and/or curved contour can preferably be angled with respect to the second plane (preferably along its extension).
  • the outer surface of the transparent piece can be used to further improve the light distribution control while not or not severely changing (e.g. increasing) the dimensions of the optical element.
  • a first surface of the optical device may comprise pits constituting the first and second cavities. This allows for an easy production of the optical element.
  • the first surface may be substantially planar at least on regions surrounding the pits. This allows for an accurate positioning of the optical element, e.g., with respect to a light source.
  • the first surface may preferably extend parallel to the second plane. This allows for an easy production of the optical element and an easy attachment of the same on a desired device.
  • the transparent piece can preferably be made of one of the following: acrylic plastic, polycarbonate, optical silicone, glass, or combinations thereof. These materials allow for an accurate light control, light passing, and a long term use.
  • the present invention is directed to a luminaire, like a street light, comprising an optical element according to the present invention as well as a light source being provided - preferably received in the first cavity - so as to emit the first and second light beams.
  • a luminaire can be easily provided in which light emitted by the light source can be easily controlled to allow for a desired light distribution pattern.
  • the light source can be a light emitting diode (LED). LEDs have small dimensions, high light output and can efficiently be operated.
  • LEDs have small dimensions, high light output and can efficiently be operated.
  • the luminaire may further comprise an LED-module comprising an LED as the light source.
  • the optical device may be attached to part of the LED-module, preferably to a circuit board (e.g. printed circuit board; PCB) of the LED-module.
  • PCB printed circuit board
  • the present invention is directed to a lighting system comprising a luminaire according to the present invention as well as a post, like a pole, for carrying the luminaire at a location of operation.
  • a lighting system comprising a luminaire according to the present invention as well as a post, like a pole, for carrying the luminaire at a location of operation.
  • the luminaire is oriented with the second geometric plane in a horizontal and, preferably, with the first geometric quarter-space being directed away from a vertical section of the post and/or being positioned below the second geometric plane.
  • the luminaire can be easily provided at any required location of operation.
  • the light distribution pattern may be controlled such that light emission mainly takes place away from the post to thus allow for a most efficient light emission.
  • the figures show different embodiments of an optical element 1 according to the present invention.
  • the optical element 1 preferably is a lens.
  • the optical element 1 is made of a transparent piece 2.
  • the transparent piece 2 can be made of acrylic plastic, polycarbonate, optical silicone, glass, or combinations thereof.
  • the optical element 1 is provided for controlling a light distribution pattern of a light source 101 radiating first light beams L1 to a first geometric quarter-space Q1 and second light beams L2 to a second geometric quarter-space Q2.
  • the first and second geometric quarter-spaces Q1, Q2 are defined by mutually perpendicular first and second geometric planes Pi, P2 so that the first geometric plane P1 constitutes a boundary between the first and second geometric quarter-spaces Q1, Q2 as can exemplarily be seen in Figs. 2, 3 , 6 and 9 .
  • the optical element 1 comprises a first cavity 3 for receiving the light source 101 as can be clearly seen in Fig. 6 and 9 .
  • the optical element 1 further comprises a second cavity 4 being delimited by a reflection surface 5 of the transparent piece 2 here preferably towards the first cavity 3 for controlling at least part of the second light beams L2 by reflecting the at least part of the second light beams L2 to the first geometric quarter-space Q1.
  • a first surface 10 of the optical element 1 may comprise pits 11, 12 constituting the first and second cavities 3, 4.
  • the first surface 10 can be substantially planar at least on regions surrounding the pits 11, 12.
  • the first surface 10 may preferably extend parallel to the second geometric plane P2, as can be seen in Figs. 2, 3 , 6 , 7 and 9 .
  • the optical element 1 further comprises a lens-section 30 of the transparent piece 2 at least partially bordering the first cavity 3 for acting as a lens for controlling a light distribution pattern of the first light beams L1.
  • the lens-section 30 can have any shape. Particularly, the inner surface 31 of the lens-section 30 bordering the first cavity 3 as well as the outer surface 32 of the lens-section 30 can be designed such that they allow for a desired light control.
  • the reflection surface 50 in a sectional view with a sectional plane being perpendicular to the first and second geometric planes Pi, P2 and when viewed parallel to the first and second geometric planes, has an arcuate contour as can be seen, for instance, in Figs. 6 and 9 .
  • the arcuate contour 50 preferably becomes more distant from the first geometric plane P1 with increased distance from the second geometric plane P2. Tangents T1 of the arcuate contour 50 and a normal N of the second geometric plane P2, respectively, may enclose an angle a, which becomes smaller with increased distance from the second geometric plane P2. This is exemplarily shown in Fig. 2 .
  • the arcuate contour 50 preferably has a parabolic or partially parabolic (here a half-parabolic) form.
  • the arcuate contour 50 thus preferably allows for an accurate control of the light with respect to the gamma angles, as exemplarily shown in Fig. 1A .
  • the wing shaped contour 51 has a central convex section 52 protruding towards the first cavity 3 or the first geometric plane Pi, and at each side of the central convex section 52 along the first plane Pi, a concave section 53, 54 bulged away from the first cavity 3 or the first geometric plane P1.
  • the concave sections 53, 54 may each have an apex 55, 56 between the central convex section 52 and a most distant end 57, 58 of the respective concave sections 53, 54 with respect to the convex section 52. This results in a somewhat arc-shaped contour of the concave sections 53, 54 as can be seen, for instance, in Fig. 4 .
  • the reflection surface 5 has the arcuate contour 50 and the wing shaped contour 51 with its central convex section 52 and concave sections 53, 54, so that a total internal reflection takes place at the reflection surface 5 when the at least part of the second light beams L2 arrive, from inside the transparent piece 2, at the reflection surface 5, as exemplarily shown in Figs. 5 to 9 .
  • the first cavity 3 and the second cavity 4 can be separated by a wall 6 of the transparent piece 2.
  • the wall 6 thus preferably comprises the reflection surface 5.
  • the reflection surface 5 may have a saddle shape.
  • the optical element 1 or at least its reflection surface 5 can be substantially symmetric with respect to a third geometric plane P3 being perpendicular to the first and second geometric planes P1, P2.
  • the third geometric plane P3 preferably crosses the central convex section 52, as can be clearly gathered from Fig. 5 .
  • the optical element 1 may further comprise a second lens-section 40 of the transparent piece 2 for acting as a lens for further controlling the light distribution pattern of the at least part of second light beams 2 after being reflected by the reflection surface 5.
  • the second lens-section preferably at least partially borders the second cavity 4. This can be gathered, for instance, from Figs. 6 and 9 .
  • the second lens-section 40 may comprise an outer bordering surface 41 of the transparent piece 2 having, in a sectional view with a sectional plane being perpendicular to the first and second geometric planes Pi, P2 and when viewed parallel to the first and second geometric planes Pi, P2, an angled and/or curved contour, wherein the angled and/or curved contour is preferably slanted towards the first geometric quarter-space Q1 and/or tangents T2 of the angled and/or curved contour are preferably angled with respect to the second plane P2 along its extension.
  • a luminaire 100 like a street light, may be provided comprising an optical element 1 according to the present invention and as described herein above in detail.
  • the luminaire 100 further comprises a light source 101.
  • the light source 101 is preferably received in the first cavity 3 or at least positioned to emit light into the first cavity 3; i.e. provided so as to emit/radiate the first and second light beams Li, L2.
  • the light source 101 may be an LED.
  • the luminaire 100 may comprise an LED-module 102 comprising an LED as the light source 101 as, for instance, shown in Figs. 6 , 7 and 9 .
  • the optical element 1 may preferably be attached to part of the LED-module 102, preferably to a circuit board 103 of the LED-module 102.
  • the present invention is further directed to a lighting system comprising the luminaire 100 according to the present invention as well as a post 200, like a pole, for carrying the luminaire 100 at a location of operation.
  • a lighting system comprising the luminaire 100 according to the present invention as well as a post 200, like a pole, for carrying the luminaire 100 at a location of operation.
  • the post 200 preferably carries the luminaire 100 at the location of operation such that the luminaire 100 is oriented with the second geometric plane P2 in a horizontal and, preferably, with the first geometric quarter-space Q1 being directed away from a vertical section 201 of the post 200 and/or being positioned below the second geometric plane P2.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP21290007.0A 2021-02-12 2021-02-12 Optisches element, leuchte und beleuchtungssystem Pending EP4043782A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21290007.0A EP4043782A1 (de) 2021-02-12 2021-02-12 Optisches element, leuchte und beleuchtungssystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21290007.0A EP4043782A1 (de) 2021-02-12 2021-02-12 Optisches element, leuchte und beleuchtungssystem

Publications (1)

Publication Number Publication Date
EP4043782A1 true EP4043782A1 (de) 2022-08-17

Family

ID=74859865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21290007.0A Pending EP4043782A1 (de) 2021-02-12 2021-02-12 Optisches element, leuchte und beleuchtungssystem

Country Status (1)

Country Link
EP (1) EP4043782A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140192521A1 (en) * 2013-01-10 2014-07-10 Ledil Oy Light guide element
US20150192267A1 (en) * 2014-01-03 2015-07-09 Cree, Inc. LED Lens
WO2019135021A1 (en) * 2018-01-04 2019-07-11 Ledil Oy An optical device for modifying light distribution
JP6720593B2 (ja) * 2016-03-10 2020-07-08 岩崎電気株式会社 道路照明用レンズ、及び道路照明器具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140192521A1 (en) * 2013-01-10 2014-07-10 Ledil Oy Light guide element
US20150192267A1 (en) * 2014-01-03 2015-07-09 Cree, Inc. LED Lens
JP6720593B2 (ja) * 2016-03-10 2020-07-08 岩崎電気株式会社 道路照明用レンズ、及び道路照明器具
WO2019135021A1 (en) * 2018-01-04 2019-07-11 Ledil Oy An optical device for modifying light distribution

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