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Dental light with dichroic and infrared filters

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Publication number
US3704928A
US3704928A US3704928DA US3704928A US 3704928 A US3704928 A US 3704928A US 3704928D A US3704928D A US 3704928DA US 3704928 A US3704928 A US 3704928A
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US
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Grant
Patent type
Prior art keywords
light
filter
lens
infrared
gate
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.)
Expired - Lifetime
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Inventor
Peter M Coombs
Ernest Davey
Conrad Edward Kowalski
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Verizon Laboratories Inc
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Verizon Laboratories Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Light filters; Selection of luminescent materials for light screens
    • F21V9/04Light filters; Selection of luminescent materials for light screens for filtering out infra-red radiation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/08Optical design with elliptical curvature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Light filters; Selection of luminescent materials for light screens
    • F21V9/08Light filters; Selection of luminescent materials for light screens for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0005Light guides specially adapted for lighting devices or systems the light guides being of the fibre type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Uses or applications of lighting devices or systems not provided for in codes F21W2101/00 - F21W2121/00
    • F21W2131/20Lighting for medical use
    • F21W2131/202Lighting for medical use for dentistry
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00Illumination
    • Y10S362/804Surgical or dental spotlight

Abstract

A fixture for dental illumination, in which an elliptical reflector and light source is used with a light gate and projection lens, these being set in an enclosing canister with the light emerging through the lens, an infrared filter in the path of the light rays to absorb unwanted heat radiation, and a dichroic filter on the surface of the lens facing the reflector to correct the light-rendering index of the emitted light. Without any filter, neither infrared nor visible, the color rendering index of the light from the device is 97.5. When the infrared filter is added, this drops to 88.0, but the addition of the dichroic visible-light filter brings this back to 97.5, which is very good.

Description

()R 3,70 ,92 SEARCH ROOM United States Patent V [151 3,704,928

Cmmbselal- SUBSTITUTE FOR MlSSING on Dec-$1972 [5 1 DENTAL LIGHT WITH DICHRQIC AND 1,279,638 9/1918 Blake ..240/41.a

INFRARED FILTERS OTHER PUBLICATIONS [72] Inventors: Peter M. Coombs, Newton, N.H.;

Ernest Davey, Lynn; Com-ad Degenkolb, et al., Dichroic Safeguards, Journal of ward Kowabki, Marblehead, both the S.M.P.T.E, V01. 76, No. 1,.1an. 1967, pp. 15-17 of Mass. Pr'ma Exam Dav'd Schonber [73] Assrgnee: Sylvnnla Electric Products, Inc. L- Kusmegr [22] Filed: Nov. 9, 1970 Attorney-Norman J. O'Malley, Laurence Burns and [211 App]. No.: 87,792 Ryan [57] ABSTRACT [52] US. Cl. ..350/l, 240/41.15, 240/41.3, A fixture for denial illumination in which an elliptical 5i] i t Cl :;35822 reflector and light source is used with a light gate and [58] d 163 166 projection lens, these being set in an enclosing e 0 canister with the light emerging through the lens, an

350/316; 240/4115 413; 353,55 infrared filter in the path of the light rays to absorb unwanted heat radiation, and a dichroic filter on the [56] References Cited surface of the lens facing the reflector to correct the UNITED STATES PATENTS light-rendering index of the emitted light. Without any filter, neither infrared nor visible, the color rendering 3,371,202 2/1968 Moore et a1. ..240/41.3 index of the light from the cievice is 97 5 w the 2,798,943 7/1957 Pndeaux ..353/55 X infrared filter iS added, this drops to 0 but the 2,827,554 3/1958 Gunther et a1 ..350/316 X dition of the (chi-oic visih|e iight filter brings ihiS 3,113,033 12/1963 Hoxie et al. ..350/1 X back to 97 which is very good.

1,349,706 8/1920 Worcester ..240/41.3

2,338,901 1/1944 Chiti ..240/4l.3 l C1alrn,2 Drawing Flgures PAIENTEDuEc 5 m2 UNCOATED WAVELENGTH IN MILL IMICRONS 400 425 wozsitzwzdmk PETER M. COOMBS ERNEST DAVEY C. EDWARD KOWALSKI INVENTORS ATTORNEY DENTAL LIGHT WITH DICIIROIC AND INFRARED FILTERS BACKGROUND OF THE INVENTION I. Field oflnvention This invention relates to fixtures for dental illumination, and in particular to such fixtures which utilize a heat-absorbing filter to prevent excessive heating of the patients face by infrared radiation.

2. Brief Summary of Prior Art Dental fixtures have been developed using a light source at one focus of an ellipsoidal reflector, and at the other focus a gate having an opening defining the extent of the beam. These provide a high intensity of light on the patients face, but since the light source is an incandescent lamp, most of its radiated energy is infrared, which does not assist the dentist in seeing, but can undesirably heat up the face of the patient on which it falls. A filter plate is used in front of the lens, that is between the lens and the patient's face to absorb the infrared and produce a cooler light.

The usual infrared filters have a broad cutoff and also absorb visible light in some parts of the spectrum. The quality of the light emitted from the fixture without the filter is such that its color-rendering index is 97.5, which is considered excellent, but the addition of the filter drops this index to 88, which is undesirable, since the dentist needs to see the patients teeth in their natural colors.

The glass filters available for cutting off the far infrared are found to transmit more in the green and yellow than in the blue, and since the incandescent source is comparatively low in blue radiation, this means that the green light will predominate and give the light a greenish tinge which is undesirable.

BRIEF SUMMARY OF INVENTION It is here that our invention solves the problem by using an additional filter which cuts down on the green and has high transmission for the blue. The filter also cuts down on the yellow, orange and red somewhat, but since the source is rich in these colors anyway, this merely helps to give a balanced light. The color temperature is raised to an acceptable balance, and the color rendering index is brought back to 97.5. We have discovered that this filter can best be utilized by making it of the dichroic type, which can be coated onto some light-transmitting part of the device. The dichroic filter was tried at the light gate, but the high radiation density at that point destroyed the dichroic coating. A coating on the back of the infrared filter, that is, on the side nearest the lens, was found to give secondary reflections back onto the gate, which was transmitted into the illuminating pattern, which was undesirable. A third approach was tried by coating the external surface of the infrared filter, but this left the coating vunerable to abrasion when cleaned.

We have discovered that all these disadvantages can be overcome by having a dichroic coating on the lens surface which faces the source of light. In the optical system used, this was the spheric side of the lens, the other side being aspheric.

BRIEF SUMMARY OF DRAWINGS Other features, objects and advantages of the invention will be apparent from the following specification, taken in connection with the accompanying drawings in which:

FIG. 1 is a graph of transmittance against wavelength for the infrared filter and for the dichroie filter on the lens; and

FIG. 2 is a longitudinal section through the centerline of the fixture.

DESCRIPTION OF SPECIFIC EMBODIMENTS In FIG. I, the dotted curve shows the transmission of the infrared filter for visible light and is to be somewhat low in the blue (400-500 millimicrons), higher in the green and yellow (500-600 millimicrons), and low again in the red (600-750 millimicrons). This, in conjunction with the incandescent filament source, produces a somewhat greenish light.

The full-line curve shows the transmission of the diehroie filter, which is high in the blue, and low in the yellow and green, rising somewhat toward the red.

Although only the visible transmissions of the filters are shown, the transmission of the infrared filter drops to zero at about 900 millimicrons and continues there up to at least 2,700 millimicrons, which was the limit of the measuring equipment.

Referring to FIG. 2, a cross sectional view of the medical and dental fixture is shown. The major components comprise a main housing canister I0, an optical system I2 located within the canister and a flexible boot l4 affixed to the rear end of the canister. The boot 14 covers and holds the electrical connections for a lamp [6. The lamp, being one of the components of the optical system of the fixture, is positioned within an ellipsoidal-shaped reflector I8. The lamp and reflector produce an intense source whose light is directed through a rectangular opening 24 centrally located in a fixed light gate 20. A spacing rim 22 spaces the lamp and reflector from the light gate so that an optimum amount of light produced by the lamp 16 passes through the gate opening 24 and thence to an aspheric lens 26, and an exterior heat absorbing cover glass 32.

The lens 26 and heat absorbing cover glass 32 are spaced from one another and held by a circular bezel 30. This segment of the optical system produces a very sharply defined rectangular light pattern.

The optically clad glass rod 40 shown in FIG. 2 is made of a glass rod probe with optically polished ends and encased within a metal casing. One end of the rod 40 extends into the housing 10, and passes through the reflector and terminates just short of the envelope 51 of the lamp, and perpendicular to the axis of the filament 50. The other end of the rod 40 extends outwardly from the housing 10 and is connected to a flexible fiber optic conduit comprised ofa standard bundle of flexible glass fibers 44 in the shape of a conduit having an approximately circular cross section.

With this arrangement the rod 40 collects from the filament light which travels over the conduit 44 to emerge at the light exit end 48.

The lens surface facing the source of light, that is, the back surface 28 of the lens 26 is coated with a dichroic filter 9 which transmits more blue light than green, and

which also passes the red. The filter can be made in the usual manner with successive thin coats or layers of magnesium fluoride and zinc sulfide, each about onefourth wavelength thick, there being 9 coats of magnesium fluoride and 10 coats of zinc sulfide in all. The coatings can be applied by vacuum disposition in the usual manner.

What we claim is: l. A dental lighting fixture comprising: an optical system including an ellipsoidal reflector having a light source disposed at one focus thereof; a fixed light gate disposed in front of said optical system, said gate having a rectangular opening disposed at the other focus of said ellipsoidal reflector;

a lens disposed in front of said light gate, said lens having a spheric side facing said light gate, the other side of said lens being aspheric;

a dichroic coating disposed on said spheric side of said lens, said coating having higher transmission of blue light than of green, yellow, orange or red light; and

an infrared absorbing glass fllter disposed in front of said lens, the combination of said dichroic coating and said filter yielding light of high color rendering index.

i l I I!

Claims (1)

1. A dental lighting fixture comprising: an optical system including an ellipsoidal reflector having a light source disposed at one focus thereof; a fixed light gate disposed in front of said optical system, said gate having a rectangular opening disposed at the other focus of said ellipsoidal reflector; a lens disposed in front of said light gate, said lens having a spheric side facing said light gate, the other side of said lens being aspheric; a dichroic coating disposed on said spheric side of said lens, said coating having higher transmission of blue light than of green, yellow, orange or red light; and an infrared absorbing glass filter disposed in front of said lens, the combination of said dichroic coating and said filter yielding light of high color rendering index.
US3704928A 1970-11-09 1970-11-09 Dental light with dichroic and infrared filters Expired - Lifetime US3704928A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930149A (en) * 1974-05-28 1975-12-30 Sterndent Corp Variable intensity dental light
US4151584A (en) * 1977-03-14 1979-04-24 Electro Controls Inc. Light-collecting reflector
US4195329A (en) * 1975-11-28 1980-03-25 Les Produits Associes Lpa Sa Diagnostic lamp, particularly for checking teeth
US4234247A (en) * 1978-10-30 1980-11-18 Corning Glass Works Method of making a reflector
US4240133A (en) * 1977-04-19 1980-12-16 Gesellschaft fur Strahlen-und Umweltforschung mbH, Munchen Quasimonochromatic light source
US4254455A (en) * 1979-12-21 1981-03-03 Pelton & Crane Company Reflector for dental, medical or the like lighting device
US4266535A (en) * 1978-04-14 1981-05-12 Les Produits Associes Bpa Sa Diagnostic lamp
US4292664A (en) * 1978-08-17 1981-09-29 Clairol Incorporated Dental plaque disclosing light and method
US4386292A (en) * 1980-07-02 1983-05-31 Gte Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
EP0120549A1 (en) * 1982-04-28 1984-10-03 John Anderson Oram Lamp unit
US4571665A (en) * 1982-04-02 1986-02-18 Espe Fabrik Pharmazeutischer Praeparate Gmbh Apparatus for treating dental materials
US4897772A (en) * 1987-12-25 1990-01-30 G-C Dental Industrial Corp. Dental astral lamp
US5003434A (en) * 1988-09-30 1991-03-26 Den-Tal-Ez, Inc. Miniature hand-held spot source of illumination
US5093769A (en) * 1990-10-04 1992-03-03 Luntsford K Paul Surgical lighting system
WO1994010499A1 (en) * 1992-11-05 1994-05-11 Cunningham David W Lighting fixture
US5728994A (en) * 1993-11-05 1998-03-17 Vari-Lite, Inc. Laser ablation method for making a light pattern generator on a transparent substrate
US6369964B1 (en) 1998-09-04 2002-04-09 General Scientific Corporation Optical filters for reducing eye strain, during surgery
US6890175B2 (en) 2002-12-18 2005-05-10 Ultradent Products, Inc. Cooling system for hand-held curing light
US6940659B2 (en) 2002-01-11 2005-09-06 Ultradent Products, Inc. Cone-shaped lens having increased forward light intensity and kits incorporating such lenses
US6994546B2 (en) 2002-12-18 2006-02-07 Ultradent Products, Inc. Light curing device with detachable power supply
US7056116B2 (en) 2004-10-26 2006-06-06 Ultradent Products, Inc. Heat sink for dental curing light comprising a plurality of different materials
US7074040B2 (en) 2004-03-30 2006-07-11 Ultradent Products, Inc. Ball lens for use with a dental curing light
US20060188836A1 (en) * 1998-01-20 2006-08-24 Kerr Corporation Apparatus and method for curing materials with light radiation
US7106523B2 (en) 2002-01-11 2006-09-12 Ultradent Products, Inc. Optical lens used to focus led light
US7144250B2 (en) 2003-12-17 2006-12-05 Ultradent Products, Inc. Rechargeable dental curing light
US7192276B2 (en) 2003-08-20 2007-03-20 Ultradent Products, Inc. Dental curing light adapted to emit light at a desired angle
US7195482B2 (en) 2003-12-30 2007-03-27 Ultradent Products, Inc. Dental curing device having a heat sink for dissipating heat
US20080106906A1 (en) * 2006-11-07 2008-05-08 Sheervision, Inc. Clamp with movable light filter/lens/prism/diffuser
US20100220490A1 (en) * 2008-09-01 2010-09-02 Timothy George Bushell Light emitting device
US20100254149A1 (en) * 2009-04-02 2010-10-07 Owen Gill Curing light device
US20140334132A1 (en) * 2013-05-13 2014-11-13 River Point, Llc Medical Headlamp Optics
US9072572B2 (en) 2009-04-02 2015-07-07 Kerr Corporation Dental light device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1279638A (en) * 1917-07-05 1918-09-24 Hall Switch & Signal Co Light-signal.
US1349706A (en) * 1920-08-17 Light-projecting lantern
US2338901A (en) * 1939-05-22 1944-01-11 Chiti Aroldo Vehicle lamp
US2798943A (en) * 1955-10-20 1957-07-09 Gen Electric Spotlight apparatus
US2827554A (en) * 1953-10-14 1958-03-18 Gunther Franz Operating table lamp
US3113033A (en) * 1960-05-16 1963-12-03 Corning Glass Works Light filter
US3371202A (en) * 1966-07-21 1968-02-27 Wech Allyn Inc Medical headlight

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1349706A (en) * 1920-08-17 Light-projecting lantern
US1279638A (en) * 1917-07-05 1918-09-24 Hall Switch & Signal Co Light-signal.
US2338901A (en) * 1939-05-22 1944-01-11 Chiti Aroldo Vehicle lamp
US2827554A (en) * 1953-10-14 1958-03-18 Gunther Franz Operating table lamp
US2798943A (en) * 1955-10-20 1957-07-09 Gen Electric Spotlight apparatus
US3113033A (en) * 1960-05-16 1963-12-03 Corning Glass Works Light filter
US3371202A (en) * 1966-07-21 1968-02-27 Wech Allyn Inc Medical headlight

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Degenkolb, et al., Dichroic Safeguards, Journal of the S.M.P.T.E, Vol. 76, No. 1, Jan. 1967, pp. 15 17 *

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930149A (en) * 1974-05-28 1975-12-30 Sterndent Corp Variable intensity dental light
US4195329A (en) * 1975-11-28 1980-03-25 Les Produits Associes Lpa Sa Diagnostic lamp, particularly for checking teeth
US4151584A (en) * 1977-03-14 1979-04-24 Electro Controls Inc. Light-collecting reflector
US4240133A (en) * 1977-04-19 1980-12-16 Gesellschaft fur Strahlen-und Umweltforschung mbH, Munchen Quasimonochromatic light source
US4266535A (en) * 1978-04-14 1981-05-12 Les Produits Associes Bpa Sa Diagnostic lamp
US4292664A (en) * 1978-08-17 1981-09-29 Clairol Incorporated Dental plaque disclosing light and method
US4234247A (en) * 1978-10-30 1980-11-18 Corning Glass Works Method of making a reflector
US4254455A (en) * 1979-12-21 1981-03-03 Pelton & Crane Company Reflector for dental, medical or the like lighting device
US4386292A (en) * 1980-07-02 1983-05-31 Gte Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
US4571665A (en) * 1982-04-02 1986-02-18 Espe Fabrik Pharmazeutischer Praeparate Gmbh Apparatus for treating dental materials
EP0120549A1 (en) * 1982-04-28 1984-10-03 John Anderson Oram Lamp unit
US4897772A (en) * 1987-12-25 1990-01-30 G-C Dental Industrial Corp. Dental astral lamp
US5003434A (en) * 1988-09-30 1991-03-26 Den-Tal-Ez, Inc. Miniature hand-held spot source of illumination
US5093769A (en) * 1990-10-04 1992-03-03 Luntsford K Paul Surgical lighting system
WO1994010499A1 (en) * 1992-11-05 1994-05-11 Cunningham David W Lighting fixture
US5345371A (en) * 1992-11-05 1994-09-06 Cunningham David W Lighting fixture
US5446637A (en) * 1992-11-05 1995-08-29 Cunningham; David W. Lighting fixture
US5728994A (en) * 1993-11-05 1998-03-17 Vari-Lite, Inc. Laser ablation method for making a light pattern generator on a transparent substrate
US5959768A (en) * 1993-11-05 1999-09-28 Vari-Lite, Inc. Light pattern generator formed on a transparent substrate
US20060188836A1 (en) * 1998-01-20 2006-08-24 Kerr Corporation Apparatus and method for curing materials with light radiation
US9622839B2 (en) 1998-01-20 2017-04-18 Kerr Corporation Apparatus and method for curing materials with radiation
US20070231769A1 (en) * 1998-01-20 2007-10-04 Jozef Kovac Apparatus and method for curing materials with radiation
US9572643B2 (en) 1998-01-20 2017-02-21 Kerr Corporation Apparatus and method for curing materials with radiation
US8568140B2 (en) 1998-01-20 2013-10-29 Jozef Kovac Apparatus and method for curing materials with radiation
US6369964B1 (en) 1998-09-04 2002-04-09 General Scientific Corporation Optical filters for reducing eye strain, during surgery
US7106523B2 (en) 2002-01-11 2006-09-12 Ultradent Products, Inc. Optical lens used to focus led light
US6940659B2 (en) 2002-01-11 2005-09-06 Ultradent Products, Inc. Cone-shaped lens having increased forward light intensity and kits incorporating such lenses
US6994546B2 (en) 2002-12-18 2006-02-07 Ultradent Products, Inc. Light curing device with detachable power supply
US6890175B2 (en) 2002-12-18 2005-05-10 Ultradent Products, Inc. Cooling system for hand-held curing light
US7192276B2 (en) 2003-08-20 2007-03-20 Ultradent Products, Inc. Dental curing light adapted to emit light at a desired angle
US7144250B2 (en) 2003-12-17 2006-12-05 Ultradent Products, Inc. Rechargeable dental curing light
US7195482B2 (en) 2003-12-30 2007-03-27 Ultradent Products, Inc. Dental curing device having a heat sink for dissipating heat
US7074040B2 (en) 2004-03-30 2006-07-11 Ultradent Products, Inc. Ball lens for use with a dental curing light
US7056116B2 (en) 2004-10-26 2006-06-06 Ultradent Products, Inc. Heat sink for dental curing light comprising a plurality of different materials
US20080106906A1 (en) * 2006-11-07 2008-05-08 Sheervision, Inc. Clamp with movable light filter/lens/prism/diffuser
US20100220490A1 (en) * 2008-09-01 2010-09-02 Timothy George Bushell Light emitting device
US9072572B2 (en) 2009-04-02 2015-07-07 Kerr Corporation Dental light device
US9066777B2 (en) 2009-04-02 2015-06-30 Kerr Corporation Curing light device
US20100254149A1 (en) * 2009-04-02 2010-10-07 Owen Gill Curing light device
US9730778B2 (en) 2009-04-02 2017-08-15 Kerr Corporation Curing light device
US9693846B2 (en) 2009-04-02 2017-07-04 Kerr Corporation Dental light device
US9687314B2 (en) 2013-05-13 2017-06-27 Riverpoint Medical, Llc Medical headlamp optical arrangement
US20140334132A1 (en) * 2013-05-13 2014-11-13 River Point, Llc Medical Headlamp Optics

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