Luminaire

Claim 2

In combination: a lamp which emits visible light, said lamp having an axis of radiation and the property of emitting a disproportionately large percentage of its luminous flux in an annulus bounded by a pair of surfaces of revolution generated around the axis by generator lines which, in an axial plane, diverge from the normal to the axis of radiation by no more than about 50*; and a reflector having a longitudinal axis, an imaginary central plane which includes said longitudinal axis and axis of radiation, and an open, inwardly concave cavity in which the lamp is placed, said cavity opening at a base plane parallel to the longitudinal axis, said cavity being bounded, at least in part, by the following reflecting surfaces: a. a cap surface which overlays the cavity, and extends generally along and transverse to said longitudinal axis; b. a pair of concave side surfaces, one on each side of the central plane, intersecting the cap surface, and extending generally along said longitudinal axis; and c. a concave end surface intersecting and interconnecting both side surfaces and the cap surface, said surfaces being specularly reflective over the major portion of their areas, and having a beam-forming property with respect to light emitted by the lamp, the axis of radiation forming an acute angle with the longitudinal axis, and the flux within said annulus impinging upon each of said surfaces.

Claim 3

A combination according to claim 1 in which the cap surface is substantially planar.

Claim 4

A combination according to claim 2 in which some portions of the cap surface are modified by light-scattering facets.

Claim 5

A combination according to claim 1 in which the section-lines of the side surfaces which are formed by intersection with said surfaces by a plane normal both to the longitudinal axis and to said side surfaces, and the section-lines formed by intersection of the end surface and a plane which includes a line in said central plane that is normal to the longitudinal axis, are at least approximations to parabolas.

Claim 6

A combination according to claim 4 in which said section lines comprise the arcs of at least two circles of different radius.

Claim 7

A combination according to claim 1 in which said side surfaces are generated by a concave arcuate generator line lying in a plane normal to the longitudinal axis and moved in a substantially straight line parallel to said longitudinal axis, said generator line being at least an approximation to a parabola.

Claim 8

A combination according to claim 6 in which said generator line comprises the arcs of at least two circles of different radius.

Claim 9

A combination according to claim 1 in which the end surface is generated by a concave arcuate generator line which lies in a plane inclusive of a central axis in said central plane which is normal to the longitudinal axis, and which generator line is moved through a circular arc around said central axis, the generator line being at least an approximation to a parabola.

Claim 10

A combination according to claim 8 in which said generator line comprises the arcs of at least two circles of different radius.

Claim 11

A combination according to claim 6 in which the end surface is generated by a concave arcuate generator line which lies in a plane inclusive of a central axis in said central plane which is normal to the longitudinal axis, and which generator line is moved through a circular arc around said central axis, the generator line being at least an approximation to a parabola.

Claim 12

A combination according to claim 10 in which each of said generator lines comprises the arcs of at least two circles of different radius.

Claim 13

A combination according to claim 11 in which the cap surface is substantially planar.

Claim 14

A combination according to claim 12 in which some portions of the cap surface are modified by light- and energy-scattering facets.

Claim 15

A combination according to claim 1 which further includes socket means for holding said lamp, said socket means being adapted to hold the lamp at different axial locations along said lamp axis.

Claim 16

A combination according to claim 11 which further includes socket means for holding said lamp, said socket means being adapted to hold the lamp at a plurality of different axial locations along said lamp axis.

Claim 17

A combination according to claim 1 in which the end of the cavity opposite the said end surface is substantially nonreflective.

Claim 18

A combination according to claim 8 in which the end of the cavity opposIte the said end surface is substantially reflective.

Claim 19

A combination according to claim 1 in which the boundaries of the surfaces at the open edge of the cavity are coplanar.

Claim 20

A combination according to claim 11 in which the boundaries of the surfaces at the open edge of the cavity are coplanar.

Claim 21

A combination according to claim 1 in which a support holds the reflector above the ground, and the greater area of illumination extends away from the projection of the support on the ground, there further being provided a socket to receive and support the lamp, there being a socket at the end of the reflector away from the support, and the reflecting end section being the closer to the support.

Claim 22

A combination according to claim 1 in which the socket end of the lamp is deeper in the cavity of the reflector than the free end of the lamp, and in which the socket end of the lamp is the end farther removed from the said end surface.

Claim 23

A reflector for forming a field of radiated light from a lamp of the type which emits visible light, said lamp having an axis of radiation and the property of emitting a disproportionately large percentage of its luminus flux in an annulus bounded by a pair of surfaces of revolution generated around the axis by generator lines which, in an axial plane, diverge from the normal to the lamp axis by no more than about 50*, said reflector having a longitudinal axis, a central plane which includes said longitudinal axis and lamp axis, and an open, inwardly concave cavity in which the lamp is placed, said cavity opening at a base plane parallel to the longitudinal axis, said cavity being bounded, at least in part, by the following reflecting surfaces: a. a cap surface which overlays the cavity, and extends generally along and transverse to said longitudinal axis; b. a pair of concave side surfaces, one on each side of the central plane, intersecting the cap surface, and extending generally along said longitudinal axis; c. a concave end surface intersecting and interconnecting both side surfaces and the cap surface, said surfaces being specularly reflective over the major portion of their areas; and means for supporting said lamp in the cavity, the said surfaces having a beam-forming property with respect to light emitted by the lamp, the means being so disposed and arranged as to support the lamp so that its axis of radiation forms an acute angle with the longitudinal axis, and the flux within said annulus impinges upon each of said surfaces.

Claim 24

A reflector for forming a field of radiated light from a lamp of the type which emits visible light, said lamp having an axis of radiation and the property of emitting a disproportionately large percentage of its luminus flux in an annulus bounded by a pair of surfaces of revolution generated around the axis by generator lines which, in an axial plane, diverge from the normal to the lamp axis by no more than about 50*, said reflector having a longitudinal axis, a central plane which includes said longitudinal axis and lamp axis, and an open, inwardly concave cavity in which the lamp is placed, said cavity opening at a base plane parallel to the longitudinal axis, said cavity being bounded, at least in part, by the following reflecting surfaces: a. a cap surface which overlays the cavity, and extends generally along and transverse to said longitudinal axis; b. a pair of concave side surfaces, one on each side of the central plane, intersecting the cap surface, and extending generally along said longitudinal axis; c. a concave end surface intersecting and interconnecting both side surfaces and the cap surface, said surfaces being specularly reflective over the major portion of their areas; and means for supporting said lamp in the cavity, the said surfaces having a beam-forming property with respect to light emitted by the lamp, the means being so disposed and arranged as to support the lamp so that its axis of radiation forms an acute angle with the longitudinal axis, and the flux within said annulus impinges upon each of said surfaces.

Claim 25

A reflector according to claim 22 in which the cap surface is substantially planar.

Claim 26

A reflector according to claim 23 in which some portions of the cap surface are modified by light-scattering facets.

Claim 27

A reflector according to claim 22 in which the section-lines of the side and end surfaces which are formed by intersection with said surfaces by a plane normal both to the longitudinal axis and to said side surfaces, and in which the section-line formed by intersection of the end surfaces and a plane which includes a line in said central plane which is normal to the longitudinal axis are at least approximations to parabolas.

Claim 28

A reflector according to claim 25 in which said section lines comprise the arcs of at least two circles of different radius.

Claim 29

A combination according to claim 22 in which said side surfaces are generated by a concave arcuate generator line lying in a plane normal to the longitudinal axis and moved in a substantially straight line parallel to said longitudinal axis, said generator line being at least an approximation to a parabola.

Claim 30

A combination according to claim 1 in which the central plane is a plane of symmetry.

Claim 31

A combination according to claim 4 in which the central plane is a plane of symmetry.

Claim 32

A combination according to claim 21 in which the central plane is a plane of symmetry.

Claim 33

A reflector according to claim 22 in which the central plane is a plane of symmetry.

Claim 34

A reflector according to cLaim 25 in which the central plane is a plane of symmetry.