Note: Descriptions are shown in the official language in which they were submitted.
CA 02565474 2006-10-24
, - . .
LIGAT FIXTO'RE
The i.nvention initially relates to a.}.ight fixture
according to the preamble of claim 1.
in particular the invention relates to a building light
s fixture, which means a light fixture fixedly installed on a
building surface or on a surface of a building that can illwninate
an exterior or interior room, for example a floor area, a wall or a
ceiling area. It can as well be used,- however, for the
illumination of an object, for example of a piece of art.
3.0 Particularly it relates to a light fixture to be installed on the
ceiling, preferably in the manner of a ceiling-mounted recessed
light fixture.
Light fixtures according to the preamble of claim 1 are
known and widely used. The applicant has been producing them for
years. A diffuser element located in the light path between the
light source and the light outlet can for example be arranged
directly in the light outlet of the housing or in the light path in
front of the light outlet. The diffuser element can be fozrned by a
glass plate and.be provided with a certain roughness or structure
so created by sand blasting'of the surface, so that the light rays are
diffusely dispersed that leads to a homogenization of the light.
Broader light distribution or improved homogenization is required
in many applications. Moreover, by means of the diffuser element
the high luminance of the lamp can be homogenized over the whole
25 surface of the diffuser element so that the lamp e.g. cannot be
that easily removed and the dazzling is reduced.
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CA 02565474 2006-10-24
A light fixture according to the preamble of claim 1 is
for example described in Dg 196 32 665 Al of applicant. There, a
reflector light fixture according to the type of a ceiling-mounted
recessed light fixture is shown that has rotationally sysnmetric
s reflector that has an lamD-holding chamber in its rear.area,*
limited by a diffusely dispersing separate flat component-designed
like a pointed cone. This diffuser element is translucent,and
opaque, which means milk-glass-like.
Based on this state-of-the art it is the object..of the
'so= invention to further develop a light fixture according to the
preamble of claim 1 such that it has a simple design and can be
variably used. This object is solved by the invention by the features of
claim 1, in particular by those of the characterizing part und is
Xs therefore characterized in that the diffuser element has tvo
regions with different transmission characteristics for the
Qeneration of two different light cones.
According-to the invention, the di.ffuser element can have
two or more regions with different transmission characteristics for
20 the light emitted by the light source. Thus, at least two
different light cones can be generated. The different lieht cones
differ from each other both regarding the type of light and
regarding the radiation angle or generally regarding their
radiating characteristic. For example a first, preferably central
ss or inner light cone can'be generated by a first region of the
diffuser element that is for example composed of clear glass and
therefore provides a direct, non-dispersed or more brilliant (so-
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CA 02565474 2006-10-24
t ' . called harder) light. A second, e.g. exterior light cone,
generated by a second region of the diffuser element that for
example is provided with a diffusely dispersing surface can
generate a more diffuse, that is more homogeneous or more broadly
s, dispersing light kncwn frcan comon diffuser elements and thus a
light of a different type. The first,. inner cone has e.g. in total
a light with higher intensity, rPhereas the second cone has a light
of lower intensity.
This way the two light cones. can overlap. The first
~v inner light cone is preferably designed more narrowly radiatiag
than the second, exterior light cone overlapping with the inner
light cone. In the case of an overlapping of the two light cones,
these two light cones are generally perceived as one joint light
distribution curve, wherein the joint light cone generated by the
as two light cones, that is the collective light distribution of the
light fixture has a central, brighter area on its inside aind.a less
bright area on its outside.
In certain applications, e.g. in sales rooms or show
rooms a for example centrally located area can be more strongly
20 illuminated by the light fixture according to.the invention thanks
to the light cone generated by the first region so that the- goods
or exhibited objects located within this light cone are
distinguished and highlighted. Around this more intensely lit
area, a more ham4ogenous illumination can be provided by the second
25 light cone that generally is perceived as agreeable light. If the
light fixture according to the invention is recessed in the
ceiling, a more homogenous illumination that is perceived as less
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CA 02565474 2006-10-24
disturbing because of its hanogeneity but that still sufficiently
lightens the room as a whole, can be achieved due to tlie different
radiation angles, particularly when the distance from the floor is
quite large.
s Thus, it is possible to generate tvro'differeat types of
light with the light fixture according to the invention.that have
different functions. This is made Dossible by one single diffuser.
element that has two different regions with differesiti. ~transmission
characteristics.
io The diffuser element can be formed, for exam,ple; by a
flat, planar or curved plate, particularly a glass or plastic'
plate. The second region can be produced.by treating a surface
region of the diffuser element or by inclusion of piyments ai
similar matters. For the surface treatment of glass plates, for.
is example in order to form the. diffuser eleaient, sand blastiagi
etching or other structuring surface-treatment procedures can be
considered. Diffuser elements in the sense of the invention are as
well such basically translucent bodies that have prisins; lenses,
holographic elements Or the like and thus form a second region.
20 The first region is preferably clear, but can also have a differeat
transmission characteristic, e.g. in the sense of a: focusing that
differs from the trgrismission characteristic of the second region.
For exanKple, the first region can be formed by a different kind of
surface-treatment method or have different prisms, different lenses
25 or different holographic elements than the second area.
The diffuser element can be color-neutral or colored.
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The light fixture preferably has one single-light source
that generates'both of the different light cones: Preferably
noint*-tyDe light sources like (high-pressure) metal halide light
fixtures, loov-voltage halide light fixtures or high-voltage halide
light fixtures are used.. Likewise, also white or colored LSDI s can
:.be used as light source. It is also possibie to provide several
light sources.
The term light cone ia the sense of the invention means a
light distribution curve with an-optional profile, e.g. in the way
io of a trvncated:cone, the profile surface of which is determined
both by the light outlet of the light.fixture and of.the reflector
surfaces that might be provided in the housing. The light cone can
have a circular-shaped profile like a truncated coae or
alternatively a profile based on a traverse, e.g. a quadratic
25 profile.
The diffuser element according to the invention can also
have more than tvo regions for the generation of more than two
different light cones.= Preferably two regions for the generation
of two different light cones are provided.
20 -From DE 196 32 665 Al of the applicant a diffuser eleaneat
is already kaovrn that in the central area has a light inlet or
finger opening. This is without any light-technical influence and
caz,mot lead to the generation=Qf light cones.
The invention furthermore relates to a light fixture
23 according to the preamble of claim 2.
The invention again is based on the light fixture shown
in FIG. 1 of DE 196 32 665 Ai, where a diffuser element is located
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' .
in the light path between light source and light outlet that
completely covers the light source. The term "completely.covers"
means that all the light emitted by the light source and leaving
the light fixture through the light outlet must pass through the
s .diffuser elemea.t. Such a diffuser element is aecessa.ry for
protection when certain.light sources are used, in-particular.
point-type light sources that can rea=ch a high operational
temperature. Such light sources, for example hiQh=pressure metal
halide light fixtures, low-voltaga halide light ,fisctures. =or high-
xo voltage.. halide light fistures have to be covered for the= protection
of people in the room by at.least on complete cover.that has-no
direct openings. Diffuser elements with ai finger opening as showa =
in FIGS. 2 to 4 of DE 196 32 665 Al must not be used-due=to the
legal regulations for such dangerous light sources.or lamps.
is The diffuser element caaupletely covering the ,Zight.. source
also has a protective function regarding light fixture defects and
protects people in the room for example in case-of an explosion of
the light source in case of which for example glass parts conld fly
around. To achieve this protective function the diffuser.element
20 has a continuous design and completely covers the light-source.
Based on a light fixture according to the: preamble of
claim 2 it is the object of this invention that the light fisture
is further developed such that it has a simple design and'can be
used in different applications.
25 The invention solves this object by the features of claim
2, particularly by the features of the characterizing part and is
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therefore characterized in that the diffuser element has two.
regions with different transmi.ssion characteristics.
The principle of the invention 'is basically to separate a
diffuser element completely covering the light sou=ce into two
s regions that have different transanission characteristics. The
regions with different transanission characteristics are used in the
manaer explained above for the generation of two different types of
lights. A first,. for exam,ple central region of the diffuser
element, which means a region basically located close to the
central longitudinal axis of the light fixture, can be clear, for
example because q.glass plate forming the diffuser element has no
treated surface in this first region.= The light passing through
the first region can thus be a more brilliant light, for example
for the illumination of goods or objects. The second reQion,
ss particularly a region surrounding the first region like a ririg can
commonly be a diffuser, for example by treating of a surface and
provide a second light cone with a more homogenous light.
For better cooyprehension of the invention and also for
reference to individual features reference is made to the above-
zo mentioned'descriptions of claim 1 in order to avoid repetition.
The 3.nvention further relates to a light fixture
according to the preamble of claim 3.
It is therefore the object of this invention, based on a
light fixture according to FIG. 1 of DE 196 32 665 Al to further
25 develop a light fixture according to the preamble of claim 3 such
that it has a simple design and can be used in different
applications.
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The object is solved in the invention by the features of
claim 3, particularly by those of the characterizing part and is
therefore characterized in that the diffuser'element has two
reg3.ons with different transmission characteristics, whezein the
rati.o of the diameter or of the breadth of the' f-irst region.to' the.
total diameter or the total breadth of the diffuser element is
between 1:5 and 2:3 approximately, preferably of approximately 1s3.
The invention is basically based on the fact that' 'the ,
diffuser element bas two different coordinated 'reQioas that caa ..
3.0 , generate different types of liQht, particularly different light
cones. This can be achieved by treating the.surface:of.a diffuser',
element preferably designed in one piece, wherein for example.a
central first region is clear and a second exterior region
surrounding=the first'region like a ring has a surtace treated by
sand blasting that causes a diffusing effect. zf the design is circular,.the
first region. caa- hnve a
first diameter and the second region can have a second diameter in
, . .
case of a corresponding circular design of the whole diffuser
element. The ratio of the first diameter to the second diameter is
20 between 1:5 and 20 approximately, preferably approximately 1:3.
Thus, a first region is provided with a size that aliows the
generation of a respective light cone with a first type of light
that differs from a second type of light of a second light cone,
geaerated by the second region.
as If the first region is not circular and the diffuser
element is not circular, instead of the term *diameter- the term
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"width' is used, that is for example the edge length of the square
in case of a square profile of the first region and of the whole
diffuser element. Alternatively, instead of the edge length, the.
length of diagonals can be used. The ratio of the widths is as
s well between approximately 1:5 and'2t3, preferably approximately
1:3. From FIGS. a to 4 of DE 196 32 665 A1 aan air inlet or
finger opening is known. The ratio of the diameter or-the inner
width of this finger opening to the complete inlet, however, is 1:6
19 to 1:7 and is thus significaatly smaller and not adequate for the
generation of a l.ight..cone of a individually recognizable type of
-light.
For better cowrehension of the invention and also for
refereace to individual features reference is made to the above-
is mentioned descriptions of claim 1 in order to avoid repetition.
According to an advantageous embodiment of the invention
the two regions generate different types of light. For example the
first region can generate a brilliant light and the second region a
harmonized, more diffuse light.
20 According to a further advantageous embodiment of the
invention the'two differeat types of light have differeat
coordinated shielding angles. That means that the light fixture ia
total can have a shielding angle of for examqple 400. In this case,
a person outside of the illuminated region, in an angle of about
25 40 or less in relation to_the cei3,ing, cannot recognize the light
source at all. Goods or objects located withia an e.g. 60 light
cone are illuminated by the brilliant light and are thus
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CA 02565474 2006-10-24
highlighted: A room region between 400 and 60 in relatiori to the
ceiling is exclusively lit by the second light cone.generated by
the second region and having a more homdogenous light that leads to
an agreeable and more purpose oriented illumination. The numbers
s indicated for the shielding angles obviously are only exempla=y'and
can vary according.to the field of application. .;
The two light cones can have diÃferent -cone eingles,
wherein'preferably the inner, central.first.light cone. radiates.
narrowly and has an cone angle (e.Q. according to FYG. 1-of'the.-
ic present.patent application) of for example 630, whereasthe second
light cone radiating a more diffuse light can have an cone angle of
for exaarple 100 . The cone angle of the light cone is determined -
by the geometry of the reÃlector, the diameter'or the-*idth of the
first region, the.diameter or the width of the diffuser element and.
is the position of the light source.
According to a further advantageous emboda.meat of the
inventions, the diffuser element is basical3.y traasluGent and can
only partially disperse, direct or focus the light passing through
it. The-first region of the diffuser element allows direct passage
so of the light. emitted by. the light source without this light being
dispersed, directed or focused, whereas the second region can have
the cozmaon function of a diffuser element in the sense of light
dispersion, direction or focusing.
According to a further advantageous embodi.ment of the
25 inventioa, the first region of the.diffuser element basically lets
the light pass through without influencing it, wherein the second
region of the diffuser element disperses the light. -This allows
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the generation of a first light cone of a first type of light, for
example of a harder, more brilliant light and the generation of a
second light cone of a second type of light with a more homogenous
light.
According to a further advantageous embodiment of the
inventions, the first region of the diffuser element is basically
centrally located on the diffuser element. This basically alloa~s a
rotationally symmetric, in any case synnnetric design of the light
fixture and the achievement of a corresponding symmetric light
.10 distributioa'characteristic of the light fixture.
According to a further advantageoue embodiment of the
inventions, the second region of the.diffuser element surrounds the
first region like a ring. This allows a particularly simvle
production of the diffuser element and a simple design, as well as
fs using a reflector element located in the light path behind the
diffuser: The reflector element and/or the light outlet can be
adapted in their diameter to the diameter of the diffuser element.
According to-a further advantageous embodiment of the
inventions, the second region of the diffuser eleaoent is obtained
20 by a surface-treatment procedure. This allows a particularly easy
production of the diffuseic-element according to the invention.
According to a further advantageous embodiment of the
inventions, the light source is basically point-type. Thus the
light distribution curve of the light fixture can be very exactly
ss predetermined.
According to a further advantageous embodiment of the
inventioas, the light fixture has a reflector element. This allaas
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a direct light direction; particularly of the light r.egioa passi.ng
through the second region of the diffuser element.
According to a further advantageous embodi.meat of the
a:nventions, the reflector element is located in the light path
s -between the diffuser e7.ement and the light outlet. This allows an-
optimized aiming of the light. -
According to a further advantaQeous embodinment-of the
.inventions, the.light source is located and-.positioaed relative--to
the first region of the diffUser element. that the light' reQi:ons - :.
passing through the first region, at least for the most-part,leave
the light fixture by the light outlet without having been seflected.
by the reflector. Thus, the light distribution curviff of the light
fixture can be further optimized.
According to a further advantageous embodiment of the
xs- inven.tions,-the light source is located and positioned relative to
the second region of the diffuser elememt such that the l3.ght=
regions passing through the second region, at-least for the most
part, leave-the light fixture by the light.outlet only after having
been reflected by the reflector. This allows a further optimized
light distribution of the light fixture. =
The diffuser element can be formed-by a flat body that is
planar or basically curved. This allows use of comon bodies, for
example used in the state-of-the-art as cover lens, like glass
plates or polyacrylic bodies or other plastic elements.
According to a further advantageous embodiment of the
invention,- all the light passing through the light outlet has
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CA 02565474 2006-10-24
passed the diffuser element before. This allows a further
optimized light distribution curve of the light fixture.
Further advantages of the inventions result from the not
cited dependent claims as well as frcs the following description of
s the embodiments shown in the dr.aarings. Therein:
FIG. 1 is a first enbodiment of a light fixture according.
to the invention in a schematic sectional view,
FIG. 2 shows the diffuser element of the light fixture
all alone according to the invention in a schematic bottom view
~o according to arrow 12 in FIG. 1;
FIG. 3 shows a second embodiment of the light fixture
according to the invention in a view-like FIG. 1, and
FIG. 4 is the light fixture according to the invention
when recessed in the ceiling with two different light cones and
13 sho.wing a person.
The light fixttire aa a whole indicated with 10 is to be
described by means of FIG. 1. It should be noted that for reasons
of clarity in differeat emboda.ments the same or similar parts or
elements have the same reference signs in the figures, partially
.ao with loarer-case letters added.
FtG: 1 shows alight fixture 1 with a longitudinal
central axis L that can also be the symmetry axis of the light
fixture 10. The longitudinal axis L also determines the atain
radiation direction A of the light of-the light fixture and in a-
25 . certain way acts as optical axis.
The light fixture 10 according to FIG. 3 can be located
rotationally symmetric around its longitudinal center axis L or as
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is the case in the embodiment of the FIGS. 1 and be only
symmetrically located to this axis and-have in total a rectaagular
or rectangular periphery, maybe also a diverging shape. Preferably
the light fixture has peripheries of the light outlet; the
s reflector element, the diffuser-element and the outside shape 'that =
are similar to each other and of a first and a second.region as
described in the following as-it is the case in the embodiments
shown in the figures.
The light fixture according to.FIt#. 1 compritses.a housing
ic 11, the.free marginal area 31 of which basically is flush vit'h a.
ceiling 12 of a room. The liglit fixture is thus desiQned ass.-a .
ceiling-mounted recessed light fixture. =n further unillustrated
embodiments, the light fixture according to the inveation.is
designed as a ceiling~mounted recessed liglat fixture or wa:ll light.
,zs fixture, a pendant light fixture or the like.
The housing 11 defines an inner a.rea 13 and a separate
holding chamber 14 for holding a lamp 15 serving as light source.
Preferably point-type-light sources are used, that is such=lighti
sources that oaly have a very sma11 lighted space 16, such as for
20 example metal halide light fixturee, low-voltage halide light
fixtures or high-voltage halide light fixtures.
The lamp 15 is fastened in a socket 17 in an'upper
housing area. Theconnection wires and maybe existing operating
devices,.cooling bodies and the like are not further described.
25 The lamp-holding chamber 14 and the interior 13 of the
light fixture 10 are separated from each other by a diffuser
element 18. The diffuser element of the embodiment of the FIG. 1
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consists of a basically rectangular, planar or flat glass plat and-
is,illustrated in FIG. 2. The diffuser elesUeat 18 has a first
region 20 centrally located at the inside'and with an edge length
a, thus with a corresponding width a. The rectangular diffuser
element 18 in total has an edge length b with a corresponding width
b. The second region,21 surrounds the first region 20 like a ring,
this ring also having a rectangu.lar outer periphery.
The surface 22 of the region 21 of the diffuser eleaient
18 facing the light source 15.was roughened.or structured by sand
blasting or any other comopaarable surface-treatment procedure.
The diffuser element 18 with the first region 20 and the
second region 21 in total has a continuous design. The hatching in
FIGS. 1 and 3 of the second region 21 of the diffuser element 18
indicates different transmission characteristics. The region 21
is acts as diffuser whi.le the first region 20 is clear and has a
surface 32 that is not sand-blasted facing the light source 15.
""'Coatrary to the kaooru light f isture of the FIGS. 2 to 4 of the D$
196 32 665 Al, the central first region 20 is as well part of the
diffuser element 18 and consists e.g. of glass or plastic. The.
2 0 first region 20 in the embodiment of FIGS. 1 and 3 in any case is
not an inlet opening, but filled with material.
The geometric configuratioa according to FIG. 1 results
causes light rays emitted by the luminous volume 16 of the lamp 15
to pass partially through the firet region 20 of the diffuser
2s element 18 and directly leave the light outlet 23 of the light
fixture 10 in this case withoeit having been reflected by a
reflector element 19. This direct-light regions are indicated at
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CA 02565474 2006-10-24
edge rays =24a and 24b and generate a first light =cone..25. of a first
type of light, that is a more brilliant or harder light. -This
light cone has a shielding angle al in relation to the ceiling 12
of about 600, for example.
s The light region of the light emitted by the.light -source_
15 passing through the second region 21 of the diffuser' element 18
is. at first diffusely.dispersed, subsequeatly reflectea =by the
inner.side of the reflector-element 19 and leaves theligrht outlet
23 of the light fixture only after reflection by.the reflector 19.
sa The exemplary light ray 28 in.F=a. 1 clarifies such.a typical. light
Qath. The marginal rays of the liqht passing throuQh-the'gecond
region 21 of the diffuser element 18 are indicate$-with 26a and 26b.
in FTG. 1 and define a second broader light cone 27 with aAbigger
cone angle of.about 1000 that has a different type of light, namely.
is. a more hcaaogenous and more diffuse or dispersed light:. It is to be
stoted that all the light regions of the light emitted by the light
source passing through the second region 21 of the.-diffuser elemeat
18 are reflected by the reflector 19 and'leave the la.ght fisture 1.0
only after reflection by the reflector element 19.
20 .F1G. 4 shows a. schematic 'view of a light fixture 10
fastened at the ceiling 12 illuminating a floor area 33. The first
light cone 25 that is generated by the central first-region 20 of
the diffuser element 18 can generate brilliant light and
distinguish, highlight or in any case brightly illuminate for
25 example an object, located on an indicated shelf 30 within the
light cone 25. The second light cone 27 generating a more
hcanogenous light can provide a more agreeable light'for other areas
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of the room and for esarple lighten the regions 34a and 34b of the
floor area and room regions 35a and 35b adjacent the floor area 33
xith'a more hawgenous light.
FIG. 4 clearly shows that the shielding angle a; of the
s second light cone 27 is smaller and of for exanple 40 . If a
person indicated with.29 in F=G. 4 is situated within the light
cone 25, vvhich might not be desired and is not shown in FIG. 4
since-this light cone basically illuminates the display, good-s,
ob3ects. or the like, the person would be illuminated with very
intense light.:" If the.person 29 is situated within the second
-light cone 27 but outside of the first light cone 25 as shown-. in '
'.Fxa. 4 the light generated by the second region 21 vould be
considered as agreeable and not disturbing and the person could for
example look at the display located on the shelf 30 without
is disturbance and with the room being opti.mally illuminated.
If, as not shoarn in FxG. 4, the person 29 is situated-
outside the second light cone 27, that.is within a smaller angle
than 40 , in relation to the ceiling 12, the:person would not be
blinded, as no direct sight connection to the lamp 15 is possible.
ae On the other hand, the person outside of the second light cone 27
perceives the whole room illumination as agreeable.
The degrees given for the shielding angle a1, az obviously
can be optionally chosen. in the same way, a plurality of light
fixtures 10 can be located on a ceiling of a building 12, the
25 individual light cones,25,.27 also overlapping if necessary, such
that fox example the effect is achieved as well, that the floor
surface 33 as a whole or for the most part is illuminated very
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brightly and intensely with brilliant lighti and most of the room
areas at a certain distance from the floor area 32,.for.example at
a height of 2 m, are illuminated for the most part by more
homogenous light.
= s FT(3. 3 shows a further embodiment of- the light fixture 10,
according to the invention that differs from the emboiiiment of
F=G: 1 basically regarding a changed design of the diffuser element
18 'that is curved, that is for example spherically arcviate. Again,
an inner central first region 20. i.s provided that- basically 'lets
1.0 light pAss through without influencing it and generates:a light
cone 25 an$ a second region.21 surrounding the first reQiori 20-like
a ring and commonly acting as diffuser and generating a'second:light cone 27.
it should be noted that the ratio of the.width a of the
as first region 20 of the diffuser elpauent 18 to the width b of the
whole diffuser element 18 in the region is 1:5 to up-to:2:3. The
einbodiments of the FIGS. 1 and 3 approximately shavr a ratio of the
width a to the width b of the whole diffuser element 18 of about
1:3. If the diffuser element.18 is arcuate, the pidth or diameter
20 'is to be considered that part of the first region 20 that results
from the projection of the'diffuser element 18 on a plaae
perpendicular to the longitudinal axis L.
The transmission characteristics of the first region 20
and of the second region 21 are different insofar as the light
23 region passing through the first region 20 passes through
unhindered by the light source 15, which means basically in an
undirected and basically undispersed way and thus particularly the
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light cone is not'fanned out or focused. The second region- 21, on
the other hand, should precisely serve for the harmonization,
fanning out.or the direction as well as sometimes for the focusing
of the light region passing through the second region 21. This
s diffusing effect of the second region 21 can be achieved by
treating the surface of the side 22 of the second region 21 facing
the light source or alternatively by treating the'side of the.
second region 21 directed away from the light source 15.
Alternatively it is also possible that an existing diffuser elemeat
lo - with for example a campletely roughened surface has a surface that.
is treated in the first region 20 such that the side 32 of the
first regioa 20 facing the light source is smoothed and thus a
clear-glass design of the first region 20 is obtained. In the same
way pigiuents, dispersing bodies or such.like can be integrated into
15 the diffuser element 18 in the region 21 or be integrated in'the
diffuser element during production.
Preferably the diffuser element 18 is produced and
designed in one piece. It is also possible, however, that the
diffuser element 18 consist of two pieces or elements or has an
20 opening in the,central region 20 that should be avoided for reasoas
of protection and safety'particularly if the afore-mentioned point-
type lamps that can reach high temperatures are used.
The second region 21 of the diffuser element 18 can be
formed by lenses or prismatic elements or by holographic
25 structures. in the same way, the second regiozi 21, as well as
soaaetimes also the first region 20 can be colorless or tinted or
colored, wherein differently colored tints are possible, too. Both
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CA 02565474 2006-10-24
the colored tints and the diffusing effect can be achieved by-: -
gluing on a foil or by fastening of cosVarable elements--on:one-
exterior side of the diffuser element 18,.it being also-possible to
provide the different regions 20, 21 with different foil"s'..
s The orientation and size of the f irst region= 20 is . such
that light from the laup 15 caanot fall directly onathe.reflector
element 19. T'hus uncontrolled reflections,can be aqoided -with a
sa.mple design.
Advantageously, the first region 20 has an.outer shape K
10. cortespCnaillg-to the total outer shape G of the diffuser=element..18
or to the outear shape of the light outlet 23. It should be' noted
that iiu-the embodiment of'yxG. 1 the light outlet 23 also has a
rectangular shape. In the embodiment of FIG. 3 the light outlets.
23, the outer shape of the first region 20 and the outer shape of'..
as the diffuser element 18'have a circular shape.
The light source is e.g. a metal halide lazp e.g. a SIT-
"-"TC=CH--according to the ZVSY-denomination {ZVE== Zentralverband der-
$lektrotechnischen industrie, centrai association of the'electrical
industry).
20 The first light cone 25 is preferably narrower than the
light cone 27 and is completely surrounded-by.the latter..- In the
area of the first light cone 25 the light is added, the light cone
25 due to the bigger luminous flux being dominated basically by the
more brilliant, direct light generating starker shadows.
25 The invention makes it possible to achieve two different
light qualities by means of a single light fixture and a single
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CA 02565474 2006-10-24
light source -with' a very simple design. 'ThLs way the.diffuser has
two different dispersion areas.
Further additional liQht guiding or light directing
elements, glasses, mirrors or the like that are not shown in the
s figures can be provided on the light fixture.
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