WO1999016136A1 - Optical irradiation device - Google Patents
Optical irradiation device Download PDFInfo
- Publication number
- WO1999016136A1 WO1999016136A1 PCT/GB1998/002905 GB9802905W WO9916136A1 WO 1999016136 A1 WO1999016136 A1 WO 1999016136A1 GB 9802905 W GB9802905 W GB 9802905W WO 9916136 A1 WO9916136 A1 WO 9916136A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- leds
- facets
- light guide
- light
- led
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/003—Apparatus for curing resins by radiation
- A61C19/004—Hand-held apparatus, e.g. guns
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/0006—Coupling light into the fibre
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N2005/065—Light sources therefor
- A61N2005/0651—Diodes
- A61N2005/0652—Arrays of diodes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0601—Apparatus for use inside the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/062—Photodynamic therapy, i.e. excitation of an agent
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
-
- 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]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
Definitions
- the invention consists in a heat pipe comprising inner and outer walls that extend longitudinally from one end of the heat pipe to the other and define an annular space therebetween containing a material that serves to absorb heat by a phase change, the annular space being divided by internal walls into a plurality of fluid flow channels that extend longitudinally between said ends, some of said channels being adapted to conduct the liquid/vapour phase of said material from the hot and of the heat pipe to the cold end, and other channels being adapted to return said liquid phase from the cold end of the pipe to the hot end.
- Fi g ure ⁇ is a schematic cross-section through a first embodiment of the invention comprising a cluster of hexagonal section LEDS;
- F -ff ur ⁇ 2 s a schematic cross-section through a second embodiment of the invention comprising a cluster of an inner group of LEDS and an outer ring of LEDS; O 99/16136
- Fi ⁇ ure 5 is a schematic longitudinal section through a fifth embodiment of the inventio ,-
- Figure 7 is a schematic cross-section through a bundle of light guide fibres with modified sections
- Ficrure $ is a schematic side elevation of a tapered light-guide according to another embodiment of the invention.
- the central group of LEDs 21,22 of Figure 2 may be replaced by the same number of LEDs in a honeycomb cluster.
- Yet another embodiment may consist of the single ring of LEDs 31 shown in Figure 3. It will be appreciated in all three illustrated embodiments, the LEDs are mounted in a substantially flat plane.
- side facets can be formed around the broader base of the LED to change its cross-section, for example to become hexagonal, but with these facets having a reducing effect on the shape of the envelope towards its tip where the focusing effect of the envelope is concentrated.
- the invention can employ existing LEDs and modify their shape in a secondary manufacturing process, for example, using jigs, or the invention can employ LEDs which have been specially manufactured with the required outer envelope shape to accommodate better clustering.
- the LEDs may also incorporate a microlens or microlens array to aid collimation of the beam.
- the typical optical irradiation device also preferably incorporates a tapered light guide, shown as guide 41 in Figure 4, to collect light emitted by the LEDs and deliver this as an output beam.
- a tapered light guide shown as guide 41 in Figure 4
- an advantage of the invention is that the more compact cross-section of the LED cluster means that the diameter at the input end of the light guide can be smaller, and thus a smaller angle of adiabatic taper (i.e.
- the ratio of the diameter of the input end to the output end of the light guide can be provided in the light guide with the consequent more efficient transmission of radiant energy and increased illuminance. This improvement is most marked compared with a conventional approach of simply increasing the numbers of LEDs in a cluster at ever increasing diameters with decreasing beneficial effect on illuminance and increasing detrimental effect on compactness, heat generation and cost.
- two or more adiabatic tapered light guides 41 are arranged in series, each with a corresponding cluster of LEDs 43, but with successive clusters forming a ring around the end of one light guide as it connects to the next.
- each successive ring of LEDs 43 may be replaced by just one or a fewer number of LEDs. This arrangement allows the overall diameter of the device to be kept relatively small as the LED clusters 43 are arranged in groups along the length of the device .
- each fibre is smaller than a single homogeneous guide rod so that they allow greater light transmission on bending around the same bend radius, but also the p acking fraction is also greatly reduced over conventional fibre guides, resulting in a greater than 90% core availability at the input end of the guide.
- a graded-index optical light guide is used.
- a graded-index light guide has no sudden interface between the cladding and the core. Instead, the refractive index varies either radially or axially.
- the gradient of the refractive index of the light guide varies both radially and axially so that the light energy is favourably manipulated.
- a guide that uses a stepped index could also be used with the same axial and radial variation in refractive index. In this way, the numeric aperture can be varied at either end of the guide to achieve the desired transmission.
- each LED or groups of LEDs could be provided with its own light guide fibre incorporating an adiabatic optical taper, and the output ends of these fibres could be collected together to form a single output beam.
- the input end of the fibre would be moulded optically to the adjacent LED or group of LEDs for efficient transmission of radiation. In this way, the diodes can be spaced more widely to dissipate unwanted heat.
- each LED could ba adjusted so that its outer envelope is extended into a fibre light guide which incorporates an adiabatic optical taper.
- the section of the fibres may be modified so that shaped faces of the fibres fit together to reduce the interstitial space.
- This design could be as shown in Figure 7.
- the light guide or light guides used according to the invention may be formed with an outer metallic coating to improve its performanc .
- the irradiance of the device according to the invention can be varied by varying the input power, number of LEDs, or by varying the adi'abatic taper of the light guide.
- Figure 5 shows a device according to the invention which incorporates a heat pipe 45 as a single lumen in the main body 46 of the device.
- the hotter of the LED leads is preferably placed nearer the heat pipe 45 or outer case 47 of the LED cluster so that the heat path of the hotter lead is shorter.
- a thermal connector 48 may be provided between the LEDs 43 and the end of the heat pipe 45. If required, additional forced cooling means may be used for example, a fan 49 or Peltier device 50 in juxtaposition to the pipe.
- a heat sink 51 may be provided.
- the LEDs are operated from batteries 52, which are located in a hand grip 53 attached to the body 46, in Figure 5.
- the heat pipe design can be modified as shown in Figure 9 to accommodate batteries.
- the heat pipe consists of two concentric heat conducting tubes 55,56 with a folded interstitial heat conduction element 57 between these tubes similar in appearance to a length of corrugate d sheet rolled into a tube. This lies within the concentric tubes.
- the wicks 58 of the heat pipe can then be placed in alternative grooves in the corrugated sheet, while the empty grooves 59 allow for the rapid movement of the vapour formed at the warmer end of the heat pipe.
- batteries, capacitors, supercapacitors or other energy source 60 can be located within the inner wall 55 of the heat pipe.
- a heat sink 51 may be necessary in addition to the heat pipe 45.
- the intermittent use of an LED irridation device for dental curing means that with careful design, a heat sink may be omitted.
- a Peltier device 50 may be added to the heat pipe, although a Peltier device will result in a greater consumption of power and a requirement for greater heat dissipation.
- the wavelengths of the LED used will depend upon the applications of the device.
- a LED emitting blue light with a peak wavelength of about 470mm is used to harden dental polymers, but a LED emitting red light may be useful for p hotodynamic therapy, for example, cancer therapy.
- the wavelength of light emitted by the LEDs may be modified in a light guide by doping the material from which it is composed with fluorescent material. This can serve to lengthen the wavelength of the emitted light so as to suit the particular application.
- the power supply for the LEDs of the device according to the invention could be mains power, battery power, capaci t or, supercapacitor, solar power, clockwork generator or generator powered by the mechanical effort of the operator or assistant.
- a capacitor or supercapacitor could be used to power the array having advantages over conventional rechargeable sources such as batteries. Capacitors can be virtually instantaneously recharged between one or more curing cycles of operation when the unit is connected to a power source.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98944118A EP1019970A1 (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device |
CA002304166A CA2304166A1 (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device |
AU91783/98A AU9178398A (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device |
US09/509,433 US7645056B1 (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device having LED and heat pipe |
JP2000513329A JP2001517875A (en) | 1997-09-25 | 1998-09-25 | Light irradiation device |
US12/627,461 US8096691B2 (en) | 1997-09-25 | 2009-11-30 | Optical irradiation device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9720443.2 | 1997-09-25 | ||
GB9720443A GB2329756A (en) | 1997-09-25 | 1997-09-25 | Assemblies of light emitting diodes |
GB9806046.0 | 1998-03-20 | ||
GBGB9806046.0A GB9806046D0 (en) | 1997-09-25 | 1998-03-20 | Dental curing |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/509,433 A-371-Of-International US7645056B1 (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device having LED and heat pipe |
US12/627,461 Division US8096691B2 (en) | 1997-09-25 | 2009-11-30 | Optical irradiation device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999016136A1 true WO1999016136A1 (en) | 1999-04-01 |
Family
ID=26312321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/002905 WO1999016136A1 (en) | 1997-09-25 | 1998-09-25 | Optical irradiation device |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1019970A1 (en) |
JP (1) | JP2001517875A (en) |
CN (1) | CN1276917A (en) |
AU (1) | AU9178398A (en) |
BR (1) | BR9813223A (en) |
CA (1) | CA2304166A1 (en) |
WO (1) | WO1999016136A1 (en) |
Cited By (69)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2000013608A1 (en) * | 1998-09-08 | 2000-03-16 | Akeda Dental A/S | Irradiation apparatus for light curing of composites, in particular for dental use |
WO2001001118A1 (en) * | 1999-06-24 | 2001-01-04 | Koninklijke Philips Electronics N.V. | Illumination module |
WO2001019280A1 (en) | 1999-09-10 | 2001-03-22 | 3M Espe Ag | Irradiation unit |
EP1090608A1 (en) | 1999-10-08 | 2001-04-11 | Mectron S.R.L. | A dental handpiece for the polymerization of photosetting compounds or resins |
EP1090607A1 (en) | 1999-10-08 | 2001-04-11 | Mectron S.R.L. | A dental handpiece for the polymerization of photosetting compounds or resins |
DE10010638A1 (en) * | 2000-03-03 | 2001-09-13 | Osram Opto Semiconductors Gmbh | Making light emitting semiconducting body with luminescence conversion element involves applying suspension with solvent, adhesive, luminescent material |
WO2001069691A1 (en) * | 2000-03-14 | 2001-09-20 | Reipur Technology A/S | A light transmitting device and methods for producing and operating the same |
EP1138276A1 (en) * | 2000-03-29 | 2001-10-04 | CMS-Dental ApS | Dental material curing apparatus |
WO2002013231A2 (en) * | 2000-08-04 | 2002-02-14 | Osram Opto Semiconductors Gmbh | Radiation source and method for producing a lens mould |
WO2002051327A1 (en) * | 2000-12-22 | 2002-07-04 | Icn Photonics Limited | Light delivery system for improving the appearance of skin |
FR2818892A1 (en) * | 2000-12-29 | 2002-07-05 | Francois Duret | Electro-optical instrument for photopolymerisation of composition materials especially used in dentistry has LED light source, battery feed and DC/DC converter |
WO2002097501A1 (en) * | 2001-05-26 | 2002-12-05 | Enfis Limited | Light emitting and focussing device |
EP1309048A1 (en) * | 2001-11-06 | 2003-05-07 | Agilent Technologies, Inc. (a Delaware corporation) | Electronic or opto-electronic packages |
JP2003516830A (en) * | 1999-12-16 | 2003-05-20 | ライト、サイエンシーズ、コーポレーション | Irradiation device for treating eye diseases |
WO2003096925A1 (en) | 2002-05-21 | 2003-11-27 | 3M Espe Ag | Radiation device |
GB2389706A (en) * | 2002-06-13 | 2003-12-17 | Enfis Ltd | Optoelectronic devices |
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JP2004505665A (en) * | 2000-08-04 | 2004-02-26 | カー コーポレイション | Apparatus and method for curing materials using light radiation |
WO2004038759A2 (en) * | 2002-08-23 | 2004-05-06 | Dahm Jonathan S | Method and apparatus for using light emitting diodes |
US6755649B2 (en) * | 1999-09-24 | 2004-06-29 | Cao Group, Inc. | Curing light |
US6755648B2 (en) * | 1999-09-24 | 2004-06-29 | Cao Group, Inc. | Curing light |
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US7086858B2 (en) * | 1999-09-24 | 2006-08-08 | Cao Group, Inc. | Semiconductor curing light system useful for curing light activated composite materials |
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US7210814B2 (en) | 2005-04-29 | 2007-05-01 | Ultradent Products, Inc. | Dental curing light with specially arranged LEDs |
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1998
- 1998-09-25 AU AU91783/98A patent/AU9178398A/en not_active Abandoned
- 1998-09-25 CN CN98810301A patent/CN1276917A/en active Pending
- 1998-09-25 WO PCT/GB1998/002905 patent/WO1999016136A1/en not_active Application Discontinuation
- 1998-09-25 BR BR9813223-7A patent/BR9813223A/en not_active IP Right Cessation
- 1998-09-25 EP EP98944118A patent/EP1019970A1/en not_active Withdrawn
- 1998-09-25 CA CA002304166A patent/CA2304166A1/en not_active Abandoned
- 1998-09-25 JP JP2000513329A patent/JP2001517875A/en active Pending
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Also Published As
Publication number | Publication date |
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BR9813223A (en) | 2000-08-29 |
CA2304166A1 (en) | 1999-04-01 |
EP1019970A1 (en) | 2000-07-19 |
CN1276917A (en) | 2000-12-13 |
AU9178398A (en) | 1999-04-12 |
JP2001517875A (en) | 2001-10-09 |
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