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Publication numberUS3769503 A
Publication typeGrant
Publication dateOct 30, 1973
Filing dateJun 23, 1972
Priority dateJun 23, 1972
Publication numberUS 3769503 A, US 3769503A, US-A-3769503, US3769503 A, US3769503A
InventorsSang Chul Kim
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lamp fixture having dichoric filter arrangement for selectively directing heat and light
US 3769503 A
Abstract
A fixture for a lamp which emits both light and heat. A first dichroic filter which reflects light and transmits heat, and a second dichroic filter which reflects heat and transmits light, are movably positioned relative to each other near the lamp, so as to be capable of selectively directing both heat and light from the lamp in a given direction, or directing light only from the lamp in a given direction.
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i United States Patent [1 Kim [ Oct. 30, 1973 [75] Inventor:

[ LAMP FIXTURE HAVING DICHORIC FILTER ARRANGEMENT FOR SELECTIVELY DIRECTING HEAT AND LIGHT Sang-Chul Kim, Cleveland Heights, Ohio [73] Assignee: General Electric Company,

Schenectady, N.Y.

[22 Filed: June 23, 1972 [21] Appl. No.: 265,444

Related US. Application Data [63] Continuation of Ser. No. 117,484, Feb. 22, 1971,

abandoned.

[52] US. Cl 240/4l.34 R, 240/47, 240/103 A [51'] Int. Cl. F211 15/02 [58] Field of Search 240/47, 103 A, 41.35

[56] References Cited UNITED STATES PATENTS 7/1963 Strawick 240/47 1,209,235 12/1916 vass ..240/103A FOREIGN PATENTS 0R APPLICATIONS 391,206 2 1924 Germany 24'0 103 A Primary ExaminerSamuel S. Matthews Assistant Exam'inerMonroe H. Hayes Attorney-Norman C. Fulmer et al.

57 5 'ABSTRACT A fixture for a lamp which emits both light and heat. I

A firstdichroic filter which reflects light and transmits heat, and a second dichroic filter which reflects heat and transmits light, are movably positioned relative to each other near the lamp, so as to be capable of selectively directing both heat and light from the lamp in a given direction, or directing light only from the lamp in a given direction.

5 Claims, 5 Drawing Figures MENU-11061301913 3,769,503

Invervtor: Sang ChuL Kim His AttOT'TWH LAMP FIXTURE HAVING DICI-IORIC FILTER ARRANGEMENT FOR SELECTIVELY DIRECTING HEAT AND LIGHT CROSS-REFERENCES TO RELATED APPLICATIONS This is a continuation of application Ser. No. 177,484, filed Feb. 22, 1971, now abandoned.

BACKGROUND OF THE INVENTION The invention is in the field of lighting fixtures, and is particularly directed to the use of dichroic filters for controlling the heat emitted by light sources.

Most of the commonly used light sources emit heat, in addition to light. Incandescent lamps and are lamps generally emit relatively greater amounts of heat, and fluorescent lamps emit relatively less heat, in comparison to the amount of light emitted. In certain lighting applications, such as general room illumination in cold weather or illumination of tropical fish in a merchandise display, it is desired that the heat of the lamp accompany the illumination. In certain other lighting applications, such as general room illumination in hot weather or illumination of flowers in a merchandise display, the heat produced by the light source is undesirable, and for such purposes dichroic filter lamps have been developed which emit light in one direction and emit the heat in the reverse direction. Dichroic filters can be made which will reflect or transmit various wavelengths of radiation. For example, one type of dichroic filter reflects visible light rays and transmits infrared (heat) rays, and another type functions in reverse so as to transmit light rays and reflect heat rays, Such filters usually are made by coating a plurality of layers of certain materials onto a transparent support member such in glass. In many lighting applications, it is awkward or unfeasible to change the type of lamp, from warm" type to cool type, or vice versa, as the need or desire changes for having heat from the lamp accompany, or not accompany, the light therefrom.

SUMMARY OF THE INVENTION Objects of the invention are to provide an improved lamp fixture, and to provide a dichroic filter arrangement which is quickly and readily adjustable for selectively causing heat from a light source to accompany, or not accompany, the light therefrom.

The invention comprises, briefly and in a preferred embodiment, a first dichroic filter member positioned with respect to a light source and adapted to reflect light from said light source in a given direction, said first dichroic filter member being further adapted to transmit therethrough heat from said light source, and a second dichroic filter member movably mounted so as to be alternatively positionable between said light source and said first dichroic filter member or on the opposite side of said light source away from said first dichroic filter member, said second dichroic filter member being adapted to reflect heat and transmit light from said light source. Preferably, said first and second dichroic filter members are in the general shape FIG. 1 is a cross-sectional view of a preferred embodiment of the invention, showing two dichroic filter members arranged to reflect light in one direction and heat in the opposite direction;

FIG. 2 is a cross-sectional view of the same apparatus as FIG. 1, with the dichroic filters positioned so as to reflect both heat and light from the lamp in the same direction;

FIG. 3 is a perspective view, toward the bottom thereof, of an arrangement of dichroic filters in the shape of hollow hemispheres;

FIG. 4 is a perspective view of an arrangement in which the dichroic filters are in the shape of hollow semi-cylinders; and

FIG. 5 is a side view of the embodiment of FIG. 4.

A DESCRIPTION OF THE FREE ERRED EMBODIMENTS In FIG. I, a ligh-emitting source 11 (which also emits heat) is held in position by means of a socket or other suitable arrangement, and may be a conventional household light bulb, or other type of lamp such as a fluorescent lamp, arc lamp, or metallic-vapor lamp. A first dichroic filter member 12, of the type which reflects visible light and transmits heat, is positioned near the light source 11 and is contoured to direct the light in a given direction, such as toward a person 14, as indicated by the light rays designated L." A second dichroic filter member 16, of the type which reflects heat and transmits light, is movably positioned with respect to the light source l1 and first filter 12, and is contoured in a curved shape as shown, so as to be rotatable generally about the light source 11. When the second filter member 16 is in the position shown in FIG. 1, i.e., on the other side of the light source 11 from the first filter member 12, it reflects heat from the light source 11 rearwardly, away from the direction of the reflected light rays L, and through the first dichroic filter member 12, as indicated by the heat rays H. Light from the source 11 and from the reflector 12 is readily transmitted through the second dichroic filter member 16, so that in the arrangement of FIG. 1 light is effectively and efficiently directed in a desired direction, unaccompanied by heat from the light source ll.

When the second dichroic filter member 16 is swung into the position shown in FIG. 2, i.e., to a position between the light source 11 and the first dichroic filter member 12, it reflects the heat rays H in the same given direction as the light rays L, as indicated in FIG. 2. The light rays reflected from the first filter member 12, pass efficiently and unobstructed in both directions through the second filter member 16, whereby the overall effectiveness and efficiency of light directed in the desired direction, both as reflected from the member 12, and as emitted directly from the light source 11, is the same in the arrangements of each of FIGS. 1 and 2. The filter member 16 may be pivoted as will be described in connection with FIGS. 3 and 4, so as -to be manually adjustable to the desired position. If desired, mechanical means such as chain, handle, or lever means, may be provided to assist in readily making the adjustment. In the position shown in FIG. l, in which the light fixture of the invention emits light only, without heat, in a desired direction, the fixture is particularly suitable for use as a reading lamp in a warm room, or as a lighting fixture in a store, where it is desired to illuminate merchandise without adding heat to the vicinity. In the position shown in FIG. 2, the light fixture is particularly suited for use as a reading lamp in a'cold room where heat from the light source 1 1 adds desired warmth, and also is suitable as a display lighting fixture where it is desired to add heat to the vicinity of the displayed merchandise.

Each of the dichroic filter members 12 and 16 may be made in well-known manner, such as by depositing ter members 12 and 16 are generally in the shape of hollow hemispheres, the filter member 16 being sup ported by pivotal mounting. means 17 so that the filter member 16 is rotatable about an axis extending approximately along a diameter thereof and through the light source 11, so that it can be positioned as shown in FIG. 3, which corresponds to the arrangement of FIG. 1, or alternatively maybe rotated to correspond to the arrangement shown in FIG. 2, so as to cause heat from the light source to accompany the light.

In the embodiment shown in FIGS. 4 and 5, the light source 11 is of elongated shape, such as a cylindrical incandescent lamp or discharge lamp, and the dichroic filtermembers l2 and 16 are in the shape of hollow semicylinders, the filter member 16 being supported by pivotal means 18 so as to be rotatable about an axis extending generally coextensive with the axis of the filter member 16 and with the axis of the light source 11. In the position shown in FIG. 4, the second filter 16 causes heat to be directed so as to accompany the light, whereas in FIG. 5 the second filter member 16 is shown in a position corresponding to the position shown in FIG. 1, so that heat from the light source 11 does not accompany the light therefrom.

While the second reflector member 16 is shown as being generally smaller than that of the first filter member 12, and arranged to be positionable between the light source 11 and first filter member 12, it could, if desired, be made larger than the first filter member 12, so as to be swingable behind the first filter member 12 come apparent to persons skilled in the art, and will fall Within the scope of invention as defined in the following claims.

vWhat I claim as new and desire to secure by Letters Patent of the United States is:

l. A lamp fixture for use with a light source which emits heat in addition to light, wherein the improvement comprises a first dichroic filter member adapted to reflect light and transmit heat from said light source and fixedly positioned with respect to said source a given distance therefrom to reflect light from said source in a given direction, and a second dichroic filter member adapted to reflect heat and transmit light from said light source, and mounting means movably positioning said second filter with respect to the position of said light source whereby said second filter can be selectively rotated about said position of the light source to positions on opposite sides thereof in alignment with said given direction of light so as to reflect heat from said light source in said given direction or away from said given direction.

' 2. A lamp fixture as claimed in claim 1, in which said first and second filter members are in the shape of hollow hemispheres with the concave surfaces thereof facing toward said position of the light source and contoured to respectively reflect said light'and heat in predetermined patterns, and in which said mounting means comprises pivotal means permitting said second filter member to be swung about an axis extending substantially along a diameter thereof and through or near said position of the light source.

3. A lamp fixture as claimed in claim 2, in which said second filter member is positioned relatively closer to said position of the light source than is said first filter member, whereby said secondfilter member can be rotated to a position between said first filter member and said position of the light source.

4. A lamp fixture as claimed in claim I, in which said first and second filter members are in the shape of hollow semicylinders with the concave surfaces thereof facing toward said position of the light source and contoured to respectively reflect said light and heat in predetermined. patterns, and in which said mounting stantially along the axis of said second semicylinder and with respect to the light source 11. A socket for the 4 through or near said position of the light source.

5. A lamp fixture as claimed in claim 4, in which said second filter member is positioned relatively closer to said position of the light source than is said first filter member, whereby said second filter member can be rotated to a position between said first filter member and said position of the'light source.

mg UNITED STATES PATENT OFFICE 5 CERTIFICATE OF CORRECTION Pat nt N 3,769,503 Dated October so, 1973 Inventor(s) Sang-Chul Kim In the Title, change "DICHORIC" to --nIcH1ioIc-'- Signed and sealed this 5th day of Mar ch 197 1..

(SEAL) Attest: I

EDWARD M.FLETCHER, JR. 7 c. MARSHALL DA'NN Attesting OffiCer- Commissioner pf .P ate nt's

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1209235 *Aug 17, 1916Dec 19, 1916Rush F VassAdjustable electric-light shade and reflector.
US3099403 *Dec 10, 1959Jul 30, 1963Strawick Raymond LLight fixture
DE391206C *Jan 18, 1921Feb 29, 1924Werner OttoGehaeuse fuer Bestrahlungslampen, insbesondere Quarzlampen
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3932881 *Mar 7, 1975Jan 13, 1976Nippon Electric Co., Inc.Electroluminescent device including dichroic and infrared reflecting components
US4048490 *Jun 11, 1976Sep 13, 1977Union Carbide CorporationApparatus for delivering relatively cold UV to a substrate
US5014172 *May 14, 1990May 7, 1991Light Years Ahead LimitedSpace lighting
US5130913 *May 14, 1991Jul 14, 1992Francis DavidLighting device with dichroic reflector
US6212004Oct 1, 1999Apr 3, 2001Applied Coatings, Inc.Reflector with directional control of visible and infra-red radiation
US6379025 *Mar 31, 2000Apr 30, 2002Pacfab, Inc.Submersible lighting fixture with color wheel
US6621087Feb 26, 1999Sep 16, 2003Arccure Technologies GmbhCold light UV irradiation device
US6811286Apr 22, 2002Nov 2, 2004Pentair Pool Products, Inc.Underwater lighting fixture with color wheel and method of control
US7003217 *Nov 19, 2003Feb 21, 2006Hon Technology Inc.Infrared heating system for patio umbrella
US7055988May 13, 2004Jun 6, 2006Pentair Pool Products, Inc.Submersible lighting fixture with color wheel
US7097329Mar 30, 2005Aug 29, 2006Pentair Pool Products, Inc.Underwater lighting fixture with color changing electric light assembly
US7128440Aug 18, 2005Oct 31, 2006Pentair Pool Products, Inc.Color-changing submersible lighting fixture with control circuit responsive to timed interruptions of the power source
US7497595Aug 8, 2006Mar 3, 2009Pentair Water Pool And Spa, Inc.Lighting fixture having two-speed color-changing mechanism
US8388179 *May 31, 2007Mar 5, 2013Lantern Holdings LimitedLighting systems
US20020149941 *Apr 22, 2002Oct 17, 2002Mateescu Michael V.Submersible lighting fixture with color wheel
US20040208008 *May 13, 2004Oct 21, 2004Pentair Pool Products, Inc.Submersible lighting fixture with color wheel
US20050105898 *Nov 19, 2003May 19, 2005Bachinski Thomas J.Infrared heating system for patio umbrella
US20050168970 *Mar 30, 2005Aug 4, 2005Pentair Pool Products, Inc.Underwater lighting fixture with color changing electric light assembly
US20050276044 *Aug 18, 2005Dec 15, 2005Pentair Pool Products, Inc.Submersible lighting fixture with color wheel
US20100265716 *May 31, 2007Oct 21, 2010Latern Holdings LimitedLighting systems
DE3044081A1 *Nov 24, 1980Sep 24, 1981Egyesuelt IzzolampaElliptical lamp reflector with IR suppression - has filter and reflector coatings to deflect infrared away from main beam and out of reflector rear
WO1999046546A1 *Feb 26, 1999Sep 16, 1999Michael BisgesCold light-uv-radiation device
Classifications
U.S. Classification362/280
International ClassificationF21V9/04, F21V9/00
Cooperative ClassificationF21V9/04
European ClassificationF21V9/04