EP1772665A1 - LED-Beleuchtungseinrichtung - Google Patents

LED-Beleuchtungseinrichtung Download PDF

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Publication number
EP1772665A1
EP1772665A1 EP06301007A EP06301007A EP1772665A1 EP 1772665 A1 EP1772665 A1 EP 1772665A1 EP 06301007 A EP06301007 A EP 06301007A EP 06301007 A EP06301007 A EP 06301007A EP 1772665 A1 EP1772665 A1 EP 1772665A1
Authority
EP
European Patent Office
Prior art keywords
lens
face
led
optical
curvature
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.)
Granted
Application number
EP06301007A
Other languages
English (en)
French (fr)
Other versions
EP1772665B1 (de
Inventor
Jacques Sabater
Jean-Marc Kubler
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.)
Optic K (societe A Responsabilite Limitee)
Original Assignee
Optic K (societe A Responsabilite Limitee)
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 Optic K (societe A Responsabilite Limitee) filed Critical Optic K (societe A Responsabilite Limitee)
Publication of EP1772665A1 publication Critical patent/EP1772665A1/de
Application granted granted Critical
Publication of EP1772665B1 publication Critical patent/EP1772665B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/041—Ball 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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • 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
    • F21W2131/20—Lighting for medical use
    • F21W2131/202—Lighting for medical use for dentistry
    • 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
    • F21W2131/20—Lighting for medical use
    • F21W2131/205—Lighting for medical use for operating theatres
    • 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 generally relates to the field of lighting, in particular lighting having to respond to particular specificities, in particular capable of producing uniform illumination, and relates to a diode lighting device, as well as to lighting devices. lighting comprising at least two such devices.
  • Devices of the aforementioned type also known as dental operating lamps or operating lights (trade name), which are currently marketed, generally include as a light source (s) halogen or incandescent bulbs, associated with a reflective surface (reflector) and to a front protection glass, the assembly being suspended at the end of an articulated support arm, with locking in precise position when stopped.
  • a light source s
  • halogen or incandescent bulbs associated with a reflective surface (reflector) and to a front protection glass, the assembly being suspended at the end of an articulated support arm, with locking in precise position when stopped.
  • Light-emitting diode lighting devices (generally designated by LEDs or LEDs) are also known. Such diodes have a long life, have low consumption and do not produce excessive heat.
  • the present invention is more particularly concerned with LEDs having a Lambertian emission indicator.
  • the radiation indicator is expressed by the following variation I ( ⁇ ):
  • I I 0 * cos ( ⁇ ), where I 0 is the luminous intensity in candela or watts per steradian in the direction of the optical beam emission axis of the LED and I is the luminous intensity in a direction making an angle ⁇ with the axis.
  • the lens devices have the advantage of forming a very clear image of the emitting surface of the LED which is very interesting to obtain uniform illumination, delimited and located on the useful area.
  • a simple known solution is to use an LED and a single lens. To obtain a clear image of the emission area on a screen and recover the maximum flux, it is desirable that the lens has at least one aspherical face.
  • the total flux collected on a 700 mm screen of the aspherical lens as defined previously is 20 lumens, hence an energy efficiency (F L / F O ratio between the total flux F L collected and refracted by the lens and the total flux F O emitted by the LED) by 33%.
  • the main problem of the invention is to provide a simple solution to significantly improve the performance of the aforementioned known solution (LED + aspherical lens), and to provide a diode lighting device better meeting the three criteria. previously mentioned.
  • the invention also relates to a dental operating light device providing shadow-free illumination, characterized in that it comprises two lighting devices as described above, mounted side by side and whose respective beams are directed in such a manner to be confused at the level of the area to be illuminated.
  • the invention further relates to a surgical operating light apparatus providing shadow-free illumination, characterized in that it comprises at least two lighting devices as described above, mounted side by side and whose respective beams are directed to be confused at the level of the area to be illuminated.
  • the lighting devices respectively forming one of the aforementioned devices are mounted together in a single housing or protective housing, for example fixed on the end of an articulated support arm.
  • the lighting device 1 comprises an LED 2 associated with an optical system 3 able to recover a large part of the luminous flux emitted by said LED and to produce a light spot remotely. 7 substantially uniform in terms of illumination.
  • the basic principle of the invention is to interpose, between the LED 2 and the projection means 5, an optical component 6 made of glass or transparent plastic material (such as polycarbonate or acrylic) which allows an improvement in efficiency.
  • an optical component 6 made of glass or transparent plastic material (such as polycarbonate or acrylic) which allows an improvement in efficiency.
  • the projection means 5 consist of or advantageously comprise at least one aspheric lens 8 (Fig. 1A) or a biconvex lens (Fig. 1B).
  • the optical component 6 is preferably a lens whose input face 6 'is spherical concave. It has a radius of curvature R1 close to that of the output face 4 of the LED. It is preferably placed intimately against the surface of the LED 2. This face 6 'is, in a preferred embodiment, almost a half-sphere to be placed in contact with the LED 2.
  • the exit face 6 "of this lens 6 is preferably also spherical, its surface being preferentially greater than a half-sphere (it may be called super-hemispherical).
  • This lens 6 aims to collect a larger solid angle from the LED.
  • this lens will be chosen so that the solid angle is multiplied by a factor of between 2.5 and 3 and the collected luminous flux multiplied by approximately 2.
  • LEDs which have a non-Lambertian indicator are also, in connection with the invention, an overall improvement in collimation efficiency since the device 1 recovers from the LED a larger solid angle.
  • the lens 6 has a spherical input face 6 'of radius R1 and a spherical output face of radius R2.
  • the vertices of the two faces are distant from e which is the thickness on the optical or symmetry axis of the lens 6.
  • This lens 6 is made of a material of index n and advantageously the first face 6 'of radius of curvature R1 has its center of curvature very close to the surface, region or emission zone 2' of the LED 2.
  • the radius R1 is very little different from the radius of curvature of the output face 2 'of the LED and these two faces 2' and 6 'can be glued together with a transparent adhesive 4'.
  • the advantage is a fixation of the lens 6 on the LED which allows a perfect and irremovable positioning, and an improvement in terms of light output because this bonding removes a very large part of the light lost by reflection on the faces 4 and 6 'opposite the LED and the lens 6.
  • the adhesive preferably of the transparent resin type, advantageously has an index comprised between the indices of the LED and the lens 6.
  • the second face 6 has a radius of curvature R2 forming a spherical diopter which operates a refraction using aplanar conjugation of the Young points.
  • the radius of curvature R2 is indeterminate and it will be chosen according to considerations of space, mechanical and optical achievements and cost.
  • a radius R1 equal to that of the output face 4 of the LED will be chosen, the input face 6 'of the lens 6 being glued against the LED, and a radius R2 making it possible to dispose said super-hemispherical lens 6 given the available space between the LED 2 and the projection means 5, for example in the form of an aspherical lens 8.
  • the simulation results show that the interposition of the super-hemispherical lens 6 gives a doubling of the photometric efficiency for a similar result in terms of image size on a screen arranged at a distance from the lighting device (comparison of the figures 3 and 4).
  • lens shapes 8 make it possible to produce this type of illumination and can thus have a toric or biconical face, for example.
  • the input face 8 ' is flat or slightly spherical and the exit face 8 "is aspherical with two different aspherical meridians in the two perpendicular planes corresponding to the two elongation directions of the illumination on the screen.
  • An exemplary embodiment of such a surface may be a biconical surface of which two perpendicular meridians are each parameterized by a radius of curvature R and a taper k.
  • the lens 8 is made of glass or plastic with a material index close to 1.5.
  • the face 8 ', facing the LED is flat.
  • At least two devices 1 [LED 2, super-hemispherical lens 6 and projection means 5, for example in the form of an aspherical lens 8] are used to obtain shade-free lighting such as provided by the standard in force.
  • the single aspheric lens 8 may be replaced by a set of at least two lenses 8 and 9, at least one of which is aspherical. This device makes it possible to continuously modify the focal length and to obtain a zoom-like effect to obtain a larger or smaller illuminated area.
  • the device 1 according to the invention is perfectly suited to this application because it allows to adapt to the illuminated area by extending in one direction the illumination for obtain rectangular lighting (Figure 5).
  • Another type of application is the focusing of the luminous flux of the LED 2 in a light guide 10. It is then important to refocus the greater part of the luminous flux inside the guide 10 which can be a transparent piece of light. one piece or a set of optical fibers.
  • the device 1 according to the invention makes it possible to collect this flux which is focused by projection optical means 5 in the form of refocusing means in the light guide 10.
  • a second identical aspherical lens 9 arranged symmetrically to the first aspherical lens 8 allows this type of refocusing, as well as a biconvex lens (FIGS. 6A and 6B).
EP06301007A 2005-10-05 2006-10-03 LED-Beleuchtungseinrichtung Not-in-force EP1772665B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0510189A FR2891607B1 (fr) 2005-10-05 2005-10-05 Dispositif d'eclairage a diode.

Publications (2)

Publication Number Publication Date
EP1772665A1 true EP1772665A1 (de) 2007-04-11
EP1772665B1 EP1772665B1 (de) 2008-06-25

Family

ID=36356027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06301007A Not-in-force EP1772665B1 (de) 2005-10-05 2006-10-03 LED-Beleuchtungseinrichtung

Country Status (7)

Country Link
EP (1) EP1772665B1 (de)
JP (1) JP2009512127A (de)
AT (1) ATE399290T1 (de)
BR (1) BRPI0616831A2 (de)
DE (1) DE602006001558D1 (de)
FR (1) FR2891607B1 (de)
WO (1) WO2007042711A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2050147A2 (de) * 2006-07-31 2009-04-22 3M Innovative Properties Company Led-quelle mit konkaver sammellinse
FR2950670A1 (fr) * 2009-09-25 2011-04-01 Effilux Dispositif d'eclairage indirect d'une surface a diodes electroluminescentes
CN104033840A (zh) * 2013-03-07 2014-09-10 长春理工大学 一种用于舞台灯二次配光的复合透镜
CN104033841A (zh) * 2013-03-07 2014-09-10 长春理工大学 一种用于舞台灯二次配光的透镜
CN104819389A (zh) * 2014-12-23 2015-08-05 深圳市科曼医疗设备有限公司 手术灯和手术灯的光斑调节装置
US10132484B2 (en) 2005-05-02 2018-11-20 Kavo Dental Technologies, Llc LED-based dental exam lamp

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7798678B2 (en) 2005-12-30 2010-09-21 3M Innovative Properties Company LED with compound encapsulant lens
WO2008016895A2 (en) 2006-07-31 2008-02-07 3M Innovative Properties Company Integrating light source module
JP5330993B2 (ja) 2006-07-31 2013-10-30 スリーエム イノベイティブ プロパティズ カンパニー 光学投影サブシステム
CN101922676B (zh) * 2009-06-09 2012-01-25 深圳市斯派克光电科技有限公司 Led路灯大角度二次配光透镜及其制造方法
TWI418741B (zh) * 2010-07-28 2013-12-11 Univ Nat Formosa Lighting device
DE102011075753A1 (de) * 2010-12-23 2012-06-28 Kaltenbach & Voigt Gmbh Zahnmedizinische Behandlungsleuchte
KR101239679B1 (ko) * 2011-02-16 2013-03-06 주식회사 케이텔 비상 조명등용 렌즈
WO2012147342A1 (ja) * 2011-04-28 2012-11-01 株式会社朝日ラバー レンズ付き光半導体装置、及びその製造方法
KR101235317B1 (ko) * 2011-05-13 2013-02-20 에스엘 주식회사 차량용 램프
KR101392118B1 (ko) * 2012-05-17 2014-05-07 액츠 주식회사 다수의 발광 소자가 배열된 발광 장치 및 표시 장치
CN104076418A (zh) * 2013-03-29 2014-10-01 海洋王（东莞）照明科技有限公司 透镜结构及其led灯具
TWI573953B (zh) * 2014-12-31 2017-03-11 國立中央大學 Adaptive headlamp module

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1165514B (de) * 1957-09-20 1964-03-19 Akad Wissenschaften Ddr Axialsymmetrische Sammellinse
JP2001044515A (ja) * 1999-07-26 2001-02-16 Rabo Sufia Kk 光学媒体、発光体及び照明器具
EP1213773A1 (de) * 1999-07-26 2002-06-12 Labosphere Institute Massive linse, lichtemittierender körper, beleuchtungskörper und optisches informationssystem
WO2003085318A1 (fr) * 2002-03-11 2003-10-16 Jean-Michel Decaudin Matrice de diodes electroluminescentes et procede de fabrication
FR2853393A1 (fr) * 2003-02-06 2004-10-08 Koito Mfg Co Ltd Phare de vehicule a diode photoemissive
JP2005208571A (ja) * 2003-12-22 2005-08-04 Seiko Epson Corp 照明装置及びプロジェクタ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1165514B (de) * 1957-09-20 1964-03-19 Akad Wissenschaften Ddr Axialsymmetrische Sammellinse
JP2001044515A (ja) * 1999-07-26 2001-02-16 Rabo Sufia Kk 光学媒体、発光体及び照明器具
EP1213773A1 (de) * 1999-07-26 2002-06-12 Labosphere Institute Massive linse, lichtemittierender körper, beleuchtungskörper und optisches informationssystem
WO2003085318A1 (fr) * 2002-03-11 2003-10-16 Jean-Michel Decaudin Matrice de diodes electroluminescentes et procede de fabrication
FR2853393A1 (fr) * 2003-02-06 2004-10-08 Koito Mfg Co Ltd Phare de vehicule a diode photoemissive
JP2005208571A (ja) * 2003-12-22 2005-08-04 Seiko Epson Corp 照明装置及びプロジェクタ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 19 5 June 2001 (2001-06-05) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10132484B2 (en) 2005-05-02 2018-11-20 Kavo Dental Technologies, Llc LED-based dental exam lamp
EP2050147A2 (de) * 2006-07-31 2009-04-22 3M Innovative Properties Company Led-quelle mit konkaver sammellinse
FR2950670A1 (fr) * 2009-09-25 2011-04-01 Effilux Dispositif d'eclairage indirect d'une surface a diodes electroluminescentes
CN104033840A (zh) * 2013-03-07 2014-09-10 长春理工大学 一种用于舞台灯二次配光的复合透镜
CN104033841A (zh) * 2013-03-07 2014-09-10 长春理工大学 一种用于舞台灯二次配光的透镜
CN104819389A (zh) * 2014-12-23 2015-08-05 深圳市科曼医疗设备有限公司 手术灯和手术灯的光斑调节装置

Also Published As

Publication number Publication date
BRPI0616831A2 (pt) 2011-07-05
ATE399290T1 (de) 2008-07-15
FR2891607A1 (fr) 2007-04-06
DE602006001558D1 (de) 2008-08-07
WO2007042711A1 (fr) 2007-04-19
EP1772665B1 (de) 2008-06-25
JP2009512127A (ja) 2009-03-19
FR2891607B1 (fr) 2007-12-28

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