EP4476478A1 - Dispositif optique de modification d'une distribution de lumière - Google Patents

Dispositif optique de modification d'une distribution de lumière

Info

Publication number
EP4476478A1
EP4476478A1 EP23703509.2A EP23703509A EP4476478A1 EP 4476478 A1 EP4476478 A1 EP 4476478A1 EP 23703509 A EP23703509 A EP 23703509A EP 4476478 A1 EP4476478 A1 EP 4476478A1
Authority
EP
European Patent Office
Prior art keywords
light
optical device
ingress
lens
center
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
EP23703509.2A
Other languages
German (de)
English (en)
Inventor
Matti VUOLA
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.)
Ledil Oy
Original Assignee
Ledil Oy
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 Ledil Oy filed Critical Ledil Oy
Publication of EP4476478A1 publication Critical patent/EP4476478A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/855—Optical field-shaping means, e.g. 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
    • F21V5/04—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

Definitions

  • the disclosure relates generally to illumination engineering. More particularly, the disclosure relates to an optical device for modifying a distribution of light produced by a light source that may comprise, for example but not necessarily, one or more light emitting diodes “LED”. Furthermore, the disclosure relates to light fixture comprising a light source and an optical device configured to modify a distribution of light produced by the light source.
  • a light source may comprise, for example but not necessarily, one or more light emitting diodes “LED”.
  • LED light emitting diodes
  • the light source may comprise, for example but not necessarily, one or more light emitting diodes “LED”, one or more filament lamps, or one or more gas-discharge lamps.
  • the distribution of light produced by a light source can be modified with optical devices such as lenses, reflectors, and combined lens-reflector devices that comprise sections which act as lenses and sections which act as reflectors.
  • Figure 1 shows a section view of an exemplifying light fixture that comprises a light source 102 and an optical device 101 according to the prior art.
  • the optical device 101 is configured to modify a distribution of light emitted by the light source 102. Exemplifying light beams are depicted with dashed line arrows.
  • the optical device 101 can be for example rotationally symmetric with respect to the y-axis of a coordinate system 199.
  • the light source 102 is a light emitting diode “LED” that comprises a semiconductor part 130 emitting blue light and yellow phosphorus 131 that converts the blue light into white light having a plurality of wavelengths.
  • a light emitting surface “LES” of the light source 102 may have for example a square shape when seen along the y-axis of the coordinate system 199, but it is not wanted that the square shape of the light emitting surface is visible on a light distribution pattern created by the light fixture.
  • the undesired effect of the shape of the light emitting surface can be mitigated for example with textures and/or roughening on the light ingress surface 104 and/or on the light egress surface 105 of a center lens 103 of the optical device 101.
  • Drawbacks of the textures and roughening is that they reduce the efficiency of the optical device 101 by reflecting light backwards towards the light source 102.
  • the textures and roughening may scatter light to undesired directions, and this may in turn cause glare.
  • geometric when used as a prefix means a geometric concept that is not necessarily a part of any physical object.
  • the geometric concept can be for example a geometric point, a geometric line, a geometric curve, a geometric plane, a non-planar geometric surface, a geometric space, or any other geometric entity that is zero, one, two, or three dimensional.
  • a new optical device for modifying a distribution of light produced by a light source.
  • An optical device is made of transparent material, and the optical device comprises a lens having a light ingress surface and a light egress surface.
  • the light ingress surface of the lens comprises a center ingress surface and an outer ingress surface that rims the center ingress surface, wherein the center ingress surface is shaped to constitute a concave lens surface and the outer ingress surface is shaped to constitute a convex lens surface.
  • a center part of a lens plays a significant role in unwanted projection of a shape of a light emitting surface on a light distribution pattern especially in conjunction with optical devices whose purpose is to produce a narrow and spot-like light distribution pattern wherein collimation is important.
  • the concavity of the center ingress surface of the optical device according to the invention eliminates or at least reduces an undesired effect of a shape of a light emitting surface of a light source on a light distribution pattern which is generated by a light fixture that comprises the light source and the optical device. Furthermore, as the center ingress surface and the outer ingress surface can be smooth, i.e. free from textures and roughening, reduction in the efficiency of the optical device can be avoided as well as scatter of light to undesired directions and thereby glare can be avoided, too.
  • a new light fixture that comprises:
  • an optical device configured to modify a distribution of light emitted by the light source.
  • a light emitting surface of the light source is located symmetrically with respect to the center ingress surface of the lens of the optical device.
  • the light source may comprise for example one or more light emitting diodes “LED”.
  • a new mold having a form suitable for manufacturing, by mold casting, a piece of transparent material, e.g. plastic, having a shape of an optical device according to the invention.
  • figure 1 illustrates a light fixture that comprises a light source and an optical device according to the prior art for modifying a light distribution
  • figure 2 illustrates a light fixture that comprises a light source and an optical device according to an exemplifying and non-limiting embodiment for modifying a light distribution
  • figure 3 illustrates an optical device not constituting a part of the invention
  • figure 4 illustrates an optical device not constituting a part of the invention.
  • Figure 2 illustrates an optical device 201 according to an exemplifying and nonlimiting embodiment.
  • the optical device 201 is configured to modify a distribution of light emitted by a light source 202.
  • the light source 202 can be for example a light emitting diode “LED” that comprises a semiconductor part emitting blue light and yellow phosphorus that converts the blue light into white light having a plurality of wavelengths.
  • exemplifying light beams are depicted with dashed line arrows.
  • the optical device 201 is shown as a section view so that the geometric section plane is parallel with the xy-plane of a coordinate system 299. In this exemplifying case, the optical device 201 is rotationally symmetric with respect to the y-axis of the coordinate system 299.
  • an optical device according to an embodiment of the invention can be an elongated element so that a section of the kind shown in figure 2 is a cross-section of the optical device and the cross-section is the same over a longitudinal length perpendicular to the geometric section plane.
  • the optical device 201 is a single piece of transparent material whose refractive index is greater than one.
  • the transparent material can be for example acrylic plastic, polycarbonate, optical silicone, or glass.
  • a method of manufacture of the optical device 201 can be for example mold casting. It is however also possible that an optical device according to an embodiment of the invention comprises elements attached to each other or otherwise mechanically supported with respect to each other.
  • the optical device 201 comprises a lens 203 that has a light ingress surface 204 and a light egress surface 205.
  • the light ingress surface 204 comprises a center ingress surface 206 and an outer ingress surface 207 that rims the center ingress surface 206.
  • the center ingress surface 206 is shaped to constitute a concave lens surface.
  • the center ingress surface 206 has a shape of a spherical dome surface. In figure 2, the radius of curvature the spherical dome surface is depicted with an arrow R.
  • the outer ingress surface 207 is shaped to constitute a convex lens surface.
  • the light egress surface 205 of the lens 203 is planar.
  • the surface area of the center ingress surface 206 can be for example from 5 % to 50 % of the surface area of the whole light ingress surface 204.
  • the concavity of the center ingress surface 206 can be defined for example so that a geometric line segment which connects two geometric points on the center ingress surface 206 to each other is outside the transparent material of the optical device 201 .
  • the convexity of the outer ingress surface 207 can be defined for example so that a geometric line segment which connects two geometric points on the outer ingress surface 207 to each other and which does not across the center ingress surface 206 is inside the transparent material.
  • the concavity of the center ingress surface 206 eliminates or at least reduces an undesired effect of a shape of a light emitting surface “LES” 220 on a light distribution pattern generated by the light fixture. Furthermore, in the exemplifying optical device 201 , the center ingress surface 206 and the outer ingress surface 207 are smooth so that the center ingress surface 206 is free from corners inside the center ingress surface and correspondingly the outer ingress surface 207 is free from corners inside the outer ingress surface. Thus, scatter of light to undesired directions and thereby glare can be avoided.
  • the exemplifying optical device 201 illustrated in figure 2 comprises a reflector section 208 bordering the lens 203.
  • the reflector section 208 comprises a light ingress surface 209 that surrounds the light ingress surface 204 of the lens 203 and a reflector surface 210 for reflecting light arrived through the light ingress surface 209 so that total internal reflections “TIR” take place on the reflector surface 210.
  • the reflector section 208 further comprises a light egress surface 211.
  • the light egress surface 211 has a shape of a truncated cone.
  • the optical device 201 and the light source 202 constitute a light fixture according to an exemplifying and non-limiting embodiment.
  • the light source 202 is mechanically supported with respect to the optical device 201 so that the light emitting surface 220 of the light source 202 is located symmetrically with respect to the center ingress surface 206 of the lens 203 of the optical device 201 .
  • the diameter D of the center ingress surface 206 of the lens 203 is in a range from 25 % to 125 % of a diameter of the smallest geometric circle capable of surrounding the light emitting surface 220 of the light source 202.
  • the light emitting surface 220 of the light source 202 has substantially a square shape when seen along the y-axis of the coordinate system 299.
  • Figure 3 shows a section view of an optical device 301 not constituting a part of the invention.
  • the geometric section plane is parallel with the xy-plane of a coordinate system 399. Exemplifying light beams are depicted with dashed line arrows.
  • the optical device 301 is made of transparent material whose refractive index is greater than one, and the optical device 301 is rotationally symmetric with respect to the y- axis of the coordinate system 399.
  • the optical device 301 comprises a lens 303 that has a light ingress surface 304 and a light egress surface 305.
  • the light ingress surface 304 comprises a center ingress surface 306 and an outer ingress surface 307 that rims the center ingress surface 306.
  • the center ingress surface 306 is shaped to constitute a concave lens surface, and the outer ingress surface 307 is shaped to constitute a convex lens surface.
  • the light egress surface 305 of the lens 303 is planar.
  • the concavity of the center ingress surface 306 eliminates or at least reduces an undesired effect of a shape of a light emitting surface “LES” 320 on a light distribution pattern modified by the optical device 301 .
  • the exemplifying optical device 301 illustrated in figure 3 comprises a reflector section 308 bordering the lens 303.
  • the reflector section 308 comprises a light ingress surface and a reflector surface for reflecting light arrived through the light ingress surface so that total internal reflections “TIR” take place on the reflector surface.
  • the reflector section has nested subsections each of which comprises a subsection-specific part of the light ingress surface of the reflector section 308 and a subsection-specific part of the reflector surface of the reflector section 308 so that the subsection-specific parts of the light ingress surface and the subsection-specific parts of the reflector surface constitute a saw-tooth profile where the subsection-specific parts of the light ingress surface and the subsection-specific parts of the reflector surface are alternately.
  • FIG 3 two of the nested subsections are denoted with references 312 and 313, a part of the light ingress surface of the reflector section 308 belonging to the subsection 312 is denoted with a reference 314, a part of the light ingress surface of the reflector section 308 belonging to the subsection 313 is denoted with a reference 315, a part of the reflector surface belonging to the subsection 312 is denoted with a reference 316, and a part of the reflector surface belonging to the subsection 313 is denoted with a reference 317.
  • Figure 4 shows a section view of an optical device 401 not constituting a part of the invention.
  • the geometric section plane is parallel with the xy-plane of a coordinate system 499.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Un dispositif optique (201) comprend une lentille (203) présentant une surface d'entrée de lumière (204) et une surface de sortie de lumière (205). La surface d'entrée de lumière comprend une surface d'entrée centrale (206) et une surface d'entrée externe (207) qui borde la surface d'entrée centrale. La surface d'entrée centrale est formée pour constituer une surface de lentille concave, et la surface d'entrée externe est formée pour constituer une surface de lentille convexe. La concavité de la surface d'entrée centrale élimine ou au moins réduit un effet indésirable d'une forme d'une surface électroluminescente d'une source de lumière (202) sur un motif de distribution de lumière généré par un appareil d'éclairage comprenant la source de lumière et le dispositif optique.
EP23703509.2A 2022-02-07 2023-01-11 Dispositif optique de modification d'une distribution de lumière Pending EP4476478A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20225104 2022-02-07
PCT/FI2023/050023 WO2023148425A1 (fr) 2022-02-07 2023-01-11 Dispositif optique de modification d'une distribution de lumière

Publications (1)

Publication Number Publication Date
EP4476478A1 true EP4476478A1 (fr) 2024-12-18

Family

ID=85174164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23703509.2A Pending EP4476478A1 (fr) 2022-02-07 2023-01-11 Dispositif optique de modification d'une distribution de lumière

Country Status (2)

Country Link
EP (1) EP4476478A1 (fr)
WO (1) WO2023148425A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011085291B4 (de) * 2011-07-08 2021-02-25 Zumtobel Lighting Gmbh Lichtbeeinflussungselement zur Beeinflussung der Lichtabgabe von im Wesentlichen punktförmigen Lichtquellen
WO2020109652A1 (fr) * 2018-11-29 2020-06-04 Ledil Oy Dispositif optique pour modifier la répartition lumineuse

Also Published As

Publication number Publication date
WO2023148425A1 (fr) 2023-08-10

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