Surgical light assembly
First Claim
1. A light assembly comprising, in combination,a first reflector having a substantially parabolic concave reflective surface, the first reflector being a cool reflector capable of transmitting infrared radiation while reflecting essentially all visible light,a second reflector having an annular divergent external reflective surface,support means mounting the first and second reflectors in fixed spaced coaxial relation to one another with their respective surfaces in generally opposed relation,
2 Assignments
0 Petitions
Accused Products
Abstract
A surgical light assembly employs three fixed, coaxially-arranged curved reflectors with a single movable light source mounted for limited movement along the axis of the reflectors to focus the light. The light source and at least the reflective surfaces of two of the reflectors are enclosed so that convective currents over these surfaces are precluded. The light is cooled by a heat sink mounted in heat transfer relation with the light source, with the heat sink having a major surface exposed to atmosphere to dissipate heat. Glare is minimized by precluding direct viewing of the light source from outside the light assembly.
52 Citations
28 Claims
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1. A light assembly comprising, in combination,
a first reflector having a substantially parabolic concave reflective surface, the first reflector being a cool reflector capable of transmitting infrared radiation while reflecting essentially all visible light, a second reflector having an annular divergent external reflective surface, support means mounting the first and second reflectors in fixed spaced coaxial relation to one another with their respective surfaces in generally opposed relation,
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2. a third reflector having an annular divergent internal reflective surface, such third reflector being mounted on the support means in fixed coaxial relation with and having its reflective surface extending in radially outwardly spaced relation to the first and second reflectors, the reflective surfaces on the first and third reflectors being directed in the same general axial direction,
a light source, an opaque light shield having a reflective surface thereon, light shield support means mounting the opaque light shield in fixed relation to the light source and between the light source and the second reflector with the reflective surface facing the light source to reflect back toward the first reflector and the light source at least the major portion of the light rays emitted in the direction of the second reflector by the light source, and mounting means supporting the light source and the opaque light shield within the concave portion of the first reflector on the common axis of the three reflectors, the mounting means including actuating means operable to move the light source and the light shield along the common axis to focus the light on an area to be illuminated.
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7. A light assembly comprising, in combination,
a first reflector having a substantially parabolic concave reflective surface, a second reflector having an annular divergent external reflective surface, support means mounting the first and second reflectors in fixed spaced coaxial relation to one another with their respective reflective surfaces in generally opposed relation, a third reflector having an annular divergent internal reflective surface, such third reflector being mounted on the support means in fixed coaxial relation with and having its reflective surface extending in radially outwardly spaced relation to the first and second reflectors, the reflective surfaces on the first and third reflectors being directed in the same general axial direction, a light source, mounting means supporting the light source within the concave portion of the first reflector on the common axis of the three reflectors, the mounting means including actuating means operable to move the light source along the common axis to focus the light on an area to be illuminated, enclosure means enclosing the light source and the reflective surfaces of the first and second reflectors, and a heat sink in the form of a mass of metal having a relatively high coefficient of thermal conductivity, the mounting means supporting the light source on and in heat-transfer relation with the heat sink, with the heat sink extending through the enclosure means and having a surface exposed to atmosphere externally of the enclosure for dispersing into the atmosphere heat absorbed from the light source, the actuating means is operable to move the heat sink and the light source mounted thereon along the common axis of the reflectors.
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15. A light assembly comprising, in combination,
a light source, first, second, and third curved reflectors, frame means mounting the first, second and third reflectors in fixed coaxial relation with the reflectors being arranged relative to one another to cooperate to reflect light from the light source onto an area to be illuminated, the first reflector having an internal, concave reflective surface, a heat sink in the form of a mass of metal having a high coefficient of thermal conductivity, heat sink mounting means supporting the heat sink for limited movement along the common axis of the reflectors, light source mounting means supporting the light source within the concavity of the first reflector and in heat-transfer relation with the heat sink, the light source being movable with the heat sink along the common axis of the reflectors to thereby focus the light reflected from the light source onto the area to be illuminated and enclosure means enclosing the light source and the reflective surfaces of the first and second reflectors, the heat sink extending through the enclosure means and having an enlarged surface exposed to atmosphere externally of the enclosure for dissipating heat to the atmosphere.
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24. A light assembly comprising, in combination,
a light source, first, second, and third curved reflectors, frame means mounting the first, second, and third reflectors in fixed co-axial relation with the reflectors being arranged relative to one another to cooperate to reflect light from the light source onto an area to be illuminated, the first reflector having an internal concave reflective surface and being a cool reflector capable of transmitting infra-red light and reflecting essentially all visible light of the spectrum, a heat sink in the form of a mass of metal having a high coefficient of thermal conductivity, heat sink mounting means supporting the heat sink for limited movement along the common axis of the reflectors, light source mounting means supporting the light source within the concavity of the first reflector and in heat transfer relation with the heat sink, the light source being moveable with the heat sink along the common axis of the reflectors to thereby focus the light reflected from the light source onto the area to be illuminated, an opaque light shield having a reflective surface thereon, light shield support means mounting the opaque light shield between the light source and the second reflector with the reflective surface facing in the direction of the light source to reflect back toward the first reflector and the light source at least the major portion of the light rays emitted in the direction of the second reflector by the light source, said light shield support means supporting the opaque light shield for movement with the light source and the heat sink by the actuating means, a hot mirror filter, and filter support means mounting the filter transversely of the common axis of the three reflectors with the first reflector and light source on one side thereof and the second reflector on the other side thereof, the hot mirror reflector being capable of reflecting infra-red light and transmitting essentially all visible light of the spectrum to further reduce the infra-red radiation emitted from the light and reflected onto the area to be illuminated.
Specification