Illumination – Light modifier – Refractor
Reexamination Certificate
2001-03-09
2004-06-01
O'Shea, Sandra (Department: 2875)
Illumination
Light modifier
Refractor
C362S328000, C362S245000, C362S293000
Reexamination Certificate
active
06742914
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to a light having a non-uniform light emission, i.e. a light wherein the light emission characteristics are different in various regions.
Lights with different light emission characteristics were hitherto realized in that the light technology of two different lights was integrated into one housing, i.e., ultimately, two lamps having a respectively separate bulb, a separate reflector and the like, were integrated in one housing. It has also been proposed to split the light of a bulb into a direct and into an indirect light part with suitable design of the reflectors. In addition, for example, EP-0 638 764 B1 discloses that a part of the light of a bulb that outputs light via a first light exit face is conducted to a second light exit face.
These latter proposals have in fact proven themselves in practice. It is nonetheless disadvantageous that the splitting of the light of the bulb and conducting it to the respective, different light exit faces was complicated with the traditional technologies. This was particularly true when a shielding of the emerging light was to be respectively produced at the various light exit faces.
SUMMARY OF THE INVENTION
The invention is based on the object of making a new lighting fixture type available wherein different emission properties in different regions can be realized more simply then previously.
Inventively, this object is achieved by a lighting fixture that has a plurality of differently fashioned regions which have different light emission properties. The lighting fixture has at least one hollow light guide having a cavity, one or more bulbs that emit light into the cavity of the hollow light guide, and at least one light output device having a light-refractive structure for outputting light from the cavity of the hollow light guide to a light exit face, the light output device or, respectively, the light output devices form walls of the hollow light guide or a part thereof, and the light of at least one bulb that beams light into the hollow light guide is beamed out in different regions of the lighting fixture that have different light emission properties.
The invention can provide that the hollow light guide comprises a plurality of differently fashioned regions which have different light output properties.
The invention can provide that the hollow light guide comprises a plurality of differently fashioned regions so that the light output via a light output device has different properties.
It can be provided that the light emitted via a light exit face of the lighting fixture in a first region has a symmetrical light intensity distribution curve and has an asymmetrical light intensity distribution curve in a second region.
It can be provided that a light output device has a plurality of regions having different light-refractive structures, particularly structures having a different light refraction behavior, for example prism structures with the same refractive index having a different prism angle for the light output.
In particular, a structure can be provided in a first region that generates a shielded light intensity distribution curve and a structure can be provided in a second region that generates a wide-angle, essentially non-shielded light intensity distribution curve that can be asymmetrical or exhibit a minimum at small angles.
It can also be provided that the light output device comprises two agents offset in the direction of a lamp axis that has a different light-refractive structure.
It can also be provided that a first region having a first light-refractive structure surrounds a second region having a second light-refractive structure on a plurality of sides. For example, the first region can adjoin the second region at two or three sides or can also completely surround it.
The invention can provide that a structure having prisms or prism-like elements with a prism angle of more then 90°, particularly 90° through 130°, and preferably 110° through 128° is provided in a first region, and a structure having prisms or prism-like elements with a prism angle of 55° through 80°, preferably 60° through 75°, is provided in a second region, respectively having a refractive index of 1.49 or, for a different refractive index having prism angles that lead to the same refraction behavior.
The invention can also provide that a reflective wall residing opposite a light output device, particularly a cap reflector, is differently fashioned in different regions offset along the direction of a lamp axis.
It can be provided that a reflective wall residing opposite a light output device comprises two regions offset in the direction of the lamp axis. The wall is differently curved with reference to a plane residing perpendicularly relatively to the lamp axis or is inclined relative to the light output device.
It can also be provided that a reflective wall residing opposite a light output device is directed relative to a lamp in a first region so that the light incident onto the wall from the lamp is incident essentially at a side facing toward the cavity and is reflected into the cavity. In a second region, the light of the same lamp, which is incident onto the wall, is reflected at least partially and may be completely reflected onto that side facing away from the cavity and is therefore reflected away from the cavity for output of an indirect light part.
In particular, the invention can provide that a lamp inputs light into the cavity, at least in regions, via a side between a reflective wall residing opposite a light output device and the light output device. The distance of the reflective wall from the surface wherein the light output device lies is greater in a first region of the hollow light guide than in a second region offset from the first region in the direction of the axis of the lamp. The distance can disappear in a second region or returned to zero, so that the light of the lamp is emitted entirely or partially past the hollow waveguide and can be employed as indirect light part of the lighting fixture.
The invention can provide that a lamp beams light onto the reflective wall only in a part of the offset regions, particularly in only one such region.
The invention can provide that a light output face comprises a first region having a first average luminous intensity and a second region adjoining the first region and having a second average luminous intensity that is lower than the first luminous intensity. In this way, a soft transition of the luminous intensity to the surroundings can be produced.
The invention can provide that the light output device comprises a planar, light-transmissive element, particularly a foil or plate, and a part of this element is provided with a partially light-transmissive coating that is preferably fashioned partially reflective in the direction of the cavity.
The invention can provide that an element that reduces the light intensity, for example a foil or plate, precedes or follows an element having a light-refractive structure in a sub-region in the light output device. This additional element need not necessarily comprise a light-refractive structure and preferably precedes said light-refractive structure.
The invention can provide that a partially light-transmissive element is arranged in the inside of the cavity at a distance from the light output device, and the element reduces the light intensity of the light incident onto a sub-region of the light output device. This element can, in particular, be a partially light-transmissive and a partially reflective plate or foil that is arranged spaced from the light output device between the light output device and a wall that lie opposite the light output device and that extends over a sub-region of the cavity.
It can also be provided that an element is arranged in the inside of the cavity of the hollow light guide spaced from the light output device. This element is arranged between the light output device and a wall lying opposite the light output device and extending over a sub-region of the ca
Siteco Beleuchtungatechnik GmbH
Truong Bao
LandOfFree
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