CA1062221A - Electric spot-lamp - Google Patents
Electric spot-lampInfo
- Publication number
- CA1062221A CA1062221A CA256,422A CA256422A CA1062221A CA 1062221 A CA1062221 A CA 1062221A CA 256422 A CA256422 A CA 256422A CA 1062221 A CA1062221 A CA 1062221A
- Authority
- CA
- Canada
- Prior art keywords
- reflector
- light
- lamp
- auxiliary
- spot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
- F21S41/47—Attachment thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
- F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
- F21V17/164—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting the parts being subjected to bending, e.g. snap joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/02—Fastening of light sources or lamp holders with provision for adjustment, e.g. for focusing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0025—Combination of two or more reflectors for a single light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/04—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
Abstract
Abstract of Disclosure A spot-light reflector structure is made up of two reflector bodies, a main reflector body and an auxiliary reflector body both of which have a shape which is, in part, that of a paraboloid of revolution. Both reflector bodies are arranged in coaxial re-lation. The main reflector body has a central aperture and is non-parabolic in the region around said aperture. The auxiliary re-flector body is arranged inside of the main reflector body and has an upper portion which is substantially hemispherical and has a central aperture which is arranged in coaxial relation to the central aperture of the main reflector body. The central aperture of the auxiliary reflector body is surrounded by a tubular ex-tension which forms preferably an integral part thereof and which is in the shape of a paraboloid of revolution of considerably smaller size than that of the main reflector body.
Description
Background of the Invention This invention refers to spot-light reflectors and has several objects. One of its objects is to provide a spot-light combining great simplicity and efficiency so that a large portion of the light emitted from the incandescent filament of an incandescent lamp is directed to the spot intended to be illuminated. Another object is to provide spot-light reflectors allowing to use in-candescent standard lamps, i.e. reflectors which are not limited to special spot-light lamps. Still another object of the invention 10 is to provide reflectors which are made up of a main reflector body and of an auxiliary reflector body and in which the latter is readily removable to facilitate the replacement of burned-out incandescent lamps. A further object of the invention is to mini-mize the portion of the total light emission of an incandescent lamp which is converted into heat.
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Summary of the Invention , A spot-light reflector structure for incandescent lamps accord- - --..
ing to this invention comprises a substantially parabolically - shaped member forming both the outer casing for an incandescent 20 lamp and also forming a parabolic reflector for light emitted from said lamp, said member having a central aperture in the apex region thereof adapted to receive the neck of an incandescent lamp, and said member further having a cylindrical rim at the end thereof opposite said apex region forming an open duct. A spot-light re-flector according to this invention comprises a substantially fully hemispherical auxiliary reflector arranged in coaxial relation to -~ said parabolically shaped member and adapted to be positioned in; front of the bulbous portion of an incandescent lamp and to re-flect light emitted from said incandescent lamp in forward direction 30 back to said parabolically shaped member. A spot-light reflector :...
-~ according to this invention further includes an arm biased by a - helical spring being pivotally supported at one end thereof ad-., .
;- jacent said rim of said parabolically shaped member and supporting ~ ~ ~ -2--.. :. ., ,. -- , . .
`` 106Z'~21 on the other end thereof said auxiliary reflector, said arm allowing said auxiliary reflector to be pivoted in such a way as to allow substitution of an incandescent lamp or another.
The above referred-to auxiliary reflector has an opening therein in the peak region thereof. A tubular extension substantially in the shape of a paraboloid of rotation has one end which is co-`. extensive with said opening of said auxiliary reflector, pro-jecting from said opening, and having a light reflecting inner surfs~e.
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Brie~escription of the Drawings Fig.l is substantially a vertical section through a spot-light embodying this invention with a standard incandescent lamp placed into it; and Fig.2 is a partial bottom-plan view of the structure shown in Fig~lo Description of Preferred Embodiment --In the drawings reference numeral 1 has been applied to indicate a main reflector body which is curved substantially parabolically, 10 i.e. has substantially the shape of a paraboloid of revolution.
The reflector body 1 proper is provided on its lower wide end with a cylindrical rim lc which forms an integral part of the main re- ~ -flector body 1 proper. Reflector body 1 defines a central aperture e in the peak region thereof. The lamp socket 2 indicated dia-grammatically is arranged outside of reflector body 1 and receives the screw-threaded portion 3a Of the neck of an incandescent lamp 3. An annular member 5 encompassing slightly less than 360 deg. is arranged inside of cylindrical rim lC. The ends 5a Of member 5 ~?~ are bent inwardly and arranged in parallel relation and form a 20 supporting bracket~ Member 5 is flexible and tends to expand - and is, there~ore,maintained by friction inside of rim lC~ Stud or rivet 8 projects transversely through supporting bracket 5a and supports an arm 6 and a helical biasing spring 7. Arm 6 is pivotable about stud 6 and projects radially inwardly from its point of support. The radially inner end of arm 6 supports a - substantially hemispherical auxiliary reflector body 4 defining a central aperture 4a which is arranged substantially in registry ~, with the aperture le in the main reflector body 1. One end of helical ~ ~ ring 7 rests against pin ld on member lc and 30 the other end of spring 7 rests against an abutment 6a on arm 6.
As a result, arm 6 and reflector 4 are biased in counterclockwise direction as seen in Fig.l and the latter envelopes the bulbous bo~tom po~t~on 3b Of the incandescent lamp 3~ The arrangement is 106Z2Zl made such that the auxiliary reflector body 4 does not physically engage the bulbous portion 3b Of the incandescent lamp 3, but that a small gap C is left between both of them. Lever 6 may be pivoted in clockwise direction as seen in Fig.l against the bias of spring 7 to get access to lamp 3 in order to replace the same. Spring 7 further tends to increase the spacing between the parallel bracket arms 5a, as a result of which the annular element 5 is expanded and engages more firmly the cylindrical portion lc of main reflector 1.
The width of element 5 may be narrower than shown iQ the drawing, as lO a result of which the structure 4-8 may be slightly moved in axial direction so to adjust the width of gap C between auxiliary re-flector 4 and the bulbous portion 3b of incandescent lamp 3. Such f an adjustment of gap C if proper precludes an overheating of in-candescent lamp 4 and a consequent reduction of the life thereof.
As shown in Fig.l light rays emitted from the incandescent filament 3c of lamp 3 are reflected from the parabolic surface thereof in parallel direction as indicated at xl and x2.
Light rays which are emitted from filament 3C rearwardly within the space of the cone A having the angle ~ leave the main re-20 flector body 1 by way of aperture le and are ultimately absorbed and converted into heat. However, light rays which are emitted ; from filament 3c forwardly within the space of the cone B having the angle B pass through the central aperture 4a in reflector body 4 and used to illuminate the area intended to be illuminated.
As shown in Figol auxiliary reflector 4 has a tubular extension ; 4b projecting forwardly from central aperture 4a and has a light reflecting inner surface which is shaped substantially para-bolically, i~e. has the shape of a parabol0id of revolution. There-fore light rays incident on the inner surface of tubular ex-; 30 tension 4b are reflected forwardly, i.e. parallel to light rays xl and x2. One such light ray is shown in Fig.l and indicated by the reference character z.
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The incandescent lamp 3 may be slightly shifted axially in forward or rearward direction as indicated by the dual arrow u.
Thus the filament 3C may be slightly adjusted relative to the focal point of the main reflector body 1. Such shifting allows to vary the direction of light rays xl and x2 from strict parallelism to slight divergence. The adjustment of the filament 3c Of lamp 3 may be coupled with an adjustment of the reflector body 4 (not illustrated in the drawing) which results in greater efficiency, irrespective of whether a slightly divergent or a strictly parallel light beam is desiredO
As clearly shown in Figol the region lb of the main reflector body 1 immediately adjacent the central aperture le thereof is curved non-parabolically in axial inward direction. As a result of this configuration, light incident UpOQ the region lb of re-flector body 1 is not entirely lost, but reflected forwardly as indicated by the light ray y. It is apparent that if the peak region of reflector body 1 were parabolic rather than deviating from the strictly parabolic shape, as shown in Fig.l, light rays incident upon the peak region of the main reflector body 1 would be reflected back into the cavity defined by reflector body 4.
The diameter of the aperture 4a in the auxiliary reflector body 4 may be in the order of 1".
The parts 4 and 4b might be affixed to main reflector body 1 by means other than those shown in the drawings, though the means shown therein is the preferred mode of embodying this invention~
As an alternative, parts 4 and 4b might be affixed to main re-flector body 1 by means of a louvre structure supporting the first mentioned parts in the center region thereof.
As mentioned before, the reflecting surfaces of main reflector - body 1 and of the tubular extension 4b Of auxiliary reflector body 4 are both curved substantially parabolically. The focal 10622Zl points of the main reflector body 1 and that of the tubular ex-tension 4b of auxiliary reflector body 4 ought to coincide as far as this is feasible.
It will be apparent from the foregoing that the bundle of light rays passing through aperture 4a form a desirable addition to the - light rays reflected from the inner surface of main reflector body .` 1.
The incandescent filament 3C of the incandescent lamp 3 may be considered to approximate a point light source. The diameters 10 of the two apertures le and 4a ought to be substantially pro-portional to their distances from the incandescent filament 3c in ` order to fully achieve the ends of this invention.
The loss of light is practically limited by the size of the aperture le in the main reflector body 1 which is relatively small, even if standard lamps are used whose neck is of larger diameter than that of special lamps intended for the purpose in hand.
4' The mechanism which has been described above assures that the movable parts 4,4b always return to their proper axial positions, so that no misalignment thereof can occur and no ad-~; 20 justment thereof is ever necessary.
j It will be apparent from the above that member 1 is substantial-; ly parabolically shaped forming both the outer casiog for in-candescent lamp 3 and a reflector for light emitted from lamp 3.
Member 1 has a central aperture le in the apex region thereof adapted to receive the neck of incandescent lamp 3. Member 1 has further a rim lc at the end opposite to aperture le forming an open duct. Reflector 4 is a substantially fully hemispherical reflector arranged in coaxial relation to member 1 and adapted to be positioned -~
in front of the bulbous portion of incandescent lamp 3 and adapted ~^ 30 to reflect light emitted from lamp 3 forwardly back to member 1.
Arm 6 biased by helical spring 7 is pivotally supported at one end thereof adjacent rim lc of member 1, and supports at the . .
~ ~ -6--: . - -' , , ~, ,, ~ 106Z2Zl other end thereof reflector 4. Thus arm 6 allows reflector 4 to be pivoted in such a way as to allow substitution of one in-candescent lamp by another. The above referred-to auxiliary re-flector 4 has an aperture 4a therein in the peak region thereof.
A tubular extension 4b substantially in the shape of a paraboloid of rotation has one end which is coextensive with said aperture 4b. Extension 4b has a light reflecting inner surface.
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Summary of the Invention , A spot-light reflector structure for incandescent lamps accord- - --..
ing to this invention comprises a substantially parabolically - shaped member forming both the outer casing for an incandescent 20 lamp and also forming a parabolic reflector for light emitted from said lamp, said member having a central aperture in the apex region thereof adapted to receive the neck of an incandescent lamp, and said member further having a cylindrical rim at the end thereof opposite said apex region forming an open duct. A spot-light re-flector according to this invention comprises a substantially fully hemispherical auxiliary reflector arranged in coaxial relation to -~ said parabolically shaped member and adapted to be positioned in; front of the bulbous portion of an incandescent lamp and to re-flect light emitted from said incandescent lamp in forward direction 30 back to said parabolically shaped member. A spot-light reflector :...
-~ according to this invention further includes an arm biased by a - helical spring being pivotally supported at one end thereof ad-., .
;- jacent said rim of said parabolically shaped member and supporting ~ ~ ~ -2--.. :. ., ,. -- , . .
`` 106Z'~21 on the other end thereof said auxiliary reflector, said arm allowing said auxiliary reflector to be pivoted in such a way as to allow substitution of an incandescent lamp or another.
The above referred-to auxiliary reflector has an opening therein in the peak region thereof. A tubular extension substantially in the shape of a paraboloid of rotation has one end which is co-`. extensive with said opening of said auxiliary reflector, pro-jecting from said opening, and having a light reflecting inner surfs~e.
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Brie~escription of the Drawings Fig.l is substantially a vertical section through a spot-light embodying this invention with a standard incandescent lamp placed into it; and Fig.2 is a partial bottom-plan view of the structure shown in Fig~lo Description of Preferred Embodiment --In the drawings reference numeral 1 has been applied to indicate a main reflector body which is curved substantially parabolically, 10 i.e. has substantially the shape of a paraboloid of revolution.
The reflector body 1 proper is provided on its lower wide end with a cylindrical rim lc which forms an integral part of the main re- ~ -flector body 1 proper. Reflector body 1 defines a central aperture e in the peak region thereof. The lamp socket 2 indicated dia-grammatically is arranged outside of reflector body 1 and receives the screw-threaded portion 3a Of the neck of an incandescent lamp 3. An annular member 5 encompassing slightly less than 360 deg. is arranged inside of cylindrical rim lC. The ends 5a Of member 5 ~?~ are bent inwardly and arranged in parallel relation and form a 20 supporting bracket~ Member 5 is flexible and tends to expand - and is, there~ore,maintained by friction inside of rim lC~ Stud or rivet 8 projects transversely through supporting bracket 5a and supports an arm 6 and a helical biasing spring 7. Arm 6 is pivotable about stud 6 and projects radially inwardly from its point of support. The radially inner end of arm 6 supports a - substantially hemispherical auxiliary reflector body 4 defining a central aperture 4a which is arranged substantially in registry ~, with the aperture le in the main reflector body 1. One end of helical ~ ~ ring 7 rests against pin ld on member lc and 30 the other end of spring 7 rests against an abutment 6a on arm 6.
As a result, arm 6 and reflector 4 are biased in counterclockwise direction as seen in Fig.l and the latter envelopes the bulbous bo~tom po~t~on 3b Of the incandescent lamp 3~ The arrangement is 106Z2Zl made such that the auxiliary reflector body 4 does not physically engage the bulbous portion 3b Of the incandescent lamp 3, but that a small gap C is left between both of them. Lever 6 may be pivoted in clockwise direction as seen in Fig.l against the bias of spring 7 to get access to lamp 3 in order to replace the same. Spring 7 further tends to increase the spacing between the parallel bracket arms 5a, as a result of which the annular element 5 is expanded and engages more firmly the cylindrical portion lc of main reflector 1.
The width of element 5 may be narrower than shown iQ the drawing, as lO a result of which the structure 4-8 may be slightly moved in axial direction so to adjust the width of gap C between auxiliary re-flector 4 and the bulbous portion 3b of incandescent lamp 3. Such f an adjustment of gap C if proper precludes an overheating of in-candescent lamp 4 and a consequent reduction of the life thereof.
As shown in Fig.l light rays emitted from the incandescent filament 3c of lamp 3 are reflected from the parabolic surface thereof in parallel direction as indicated at xl and x2.
Light rays which are emitted from filament 3C rearwardly within the space of the cone A having the angle ~ leave the main re-20 flector body 1 by way of aperture le and are ultimately absorbed and converted into heat. However, light rays which are emitted ; from filament 3c forwardly within the space of the cone B having the angle B pass through the central aperture 4a in reflector body 4 and used to illuminate the area intended to be illuminated.
As shown in Figol auxiliary reflector 4 has a tubular extension ; 4b projecting forwardly from central aperture 4a and has a light reflecting inner surface which is shaped substantially para-bolically, i~e. has the shape of a parabol0id of revolution. There-fore light rays incident on the inner surface of tubular ex-; 30 tension 4b are reflected forwardly, i.e. parallel to light rays xl and x2. One such light ray is shown in Fig.l and indicated by the reference character z.
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The incandescent lamp 3 may be slightly shifted axially in forward or rearward direction as indicated by the dual arrow u.
Thus the filament 3C may be slightly adjusted relative to the focal point of the main reflector body 1. Such shifting allows to vary the direction of light rays xl and x2 from strict parallelism to slight divergence. The adjustment of the filament 3c Of lamp 3 may be coupled with an adjustment of the reflector body 4 (not illustrated in the drawing) which results in greater efficiency, irrespective of whether a slightly divergent or a strictly parallel light beam is desiredO
As clearly shown in Figol the region lb of the main reflector body 1 immediately adjacent the central aperture le thereof is curved non-parabolically in axial inward direction. As a result of this configuration, light incident UpOQ the region lb of re-flector body 1 is not entirely lost, but reflected forwardly as indicated by the light ray y. It is apparent that if the peak region of reflector body 1 were parabolic rather than deviating from the strictly parabolic shape, as shown in Fig.l, light rays incident upon the peak region of the main reflector body 1 would be reflected back into the cavity defined by reflector body 4.
The diameter of the aperture 4a in the auxiliary reflector body 4 may be in the order of 1".
The parts 4 and 4b might be affixed to main reflector body 1 by means other than those shown in the drawings, though the means shown therein is the preferred mode of embodying this invention~
As an alternative, parts 4 and 4b might be affixed to main re-flector body 1 by means of a louvre structure supporting the first mentioned parts in the center region thereof.
As mentioned before, the reflecting surfaces of main reflector - body 1 and of the tubular extension 4b Of auxiliary reflector body 4 are both curved substantially parabolically. The focal 10622Zl points of the main reflector body 1 and that of the tubular ex-tension 4b of auxiliary reflector body 4 ought to coincide as far as this is feasible.
It will be apparent from the foregoing that the bundle of light rays passing through aperture 4a form a desirable addition to the - light rays reflected from the inner surface of main reflector body .` 1.
The incandescent filament 3C of the incandescent lamp 3 may be considered to approximate a point light source. The diameters 10 of the two apertures le and 4a ought to be substantially pro-portional to their distances from the incandescent filament 3c in ` order to fully achieve the ends of this invention.
The loss of light is practically limited by the size of the aperture le in the main reflector body 1 which is relatively small, even if standard lamps are used whose neck is of larger diameter than that of special lamps intended for the purpose in hand.
4' The mechanism which has been described above assures that the movable parts 4,4b always return to their proper axial positions, so that no misalignment thereof can occur and no ad-~; 20 justment thereof is ever necessary.
j It will be apparent from the above that member 1 is substantial-; ly parabolically shaped forming both the outer casiog for in-candescent lamp 3 and a reflector for light emitted from lamp 3.
Member 1 has a central aperture le in the apex region thereof adapted to receive the neck of incandescent lamp 3. Member 1 has further a rim lc at the end opposite to aperture le forming an open duct. Reflector 4 is a substantially fully hemispherical reflector arranged in coaxial relation to member 1 and adapted to be positioned -~
in front of the bulbous portion of incandescent lamp 3 and adapted ~^ 30 to reflect light emitted from lamp 3 forwardly back to member 1.
Arm 6 biased by helical spring 7 is pivotally supported at one end thereof adjacent rim lc of member 1, and supports at the . .
~ ~ -6--: . - -' , , ~, ,, ~ 106Z2Zl other end thereof reflector 4. Thus arm 6 allows reflector 4 to be pivoted in such a way as to allow substitution of one in-candescent lamp by another. The above referred-to auxiliary re-flector 4 has an aperture 4a therein in the peak region thereof.
A tubular extension 4b substantially in the shape of a paraboloid of rotation has one end which is coextensive with said aperture 4b. Extension 4b has a light reflecting inner surface.
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Claims (4)
1. A spot-light reflector structure for incandescent lamps comprising (a) a substantially parabolically shaped member forming both the outer casing for an incandescent lamp and also forming a parabolic reflector for light emitted from said lamp, said mem-ber having a central aperture in the apex region thereof adapted to receive the neck of an incandescent lamp, and said member further having a cylindrical rim at the end thereof opposite said apex region forming an open duct;
(b) a substantially fully hemispherical auxiliary reflector arranged in coaxial relation to said parabolically shaped member and adapted to be positioned in front of the bulbous portion of an incandescent lamp and to reflect light emitted from said in-candescent lamp in forward direction back to said parabolically shaped member;
(c) an arm biased by a helical spring being pivotally supported at one end thereof adjacent said rim of said parabolically shaped member and supporting on the other end thereof said auxiliary re-flector, said arm allowing said auxiliary reflector to be pivoted in such a way as to allow substitution of an incandescent lamp by another;
(d) said auxiliary reflector having an opening therein in the peak region thereof, a tubular extension substantially in the shape of a paraboloid of rotation having one end coextensive with said opening in said auxiliary reflector, projecting from said opening and having a light reflecting inner surface.
(b) a substantially fully hemispherical auxiliary reflector arranged in coaxial relation to said parabolically shaped member and adapted to be positioned in front of the bulbous portion of an incandescent lamp and to reflect light emitted from said in-candescent lamp in forward direction back to said parabolically shaped member;
(c) an arm biased by a helical spring being pivotally supported at one end thereof adjacent said rim of said parabolically shaped member and supporting on the other end thereof said auxiliary re-flector, said arm allowing said auxiliary reflector to be pivoted in such a way as to allow substitution of an incandescent lamp by another;
(d) said auxiliary reflector having an opening therein in the peak region thereof, a tubular extension substantially in the shape of a paraboloid of rotation having one end coextensive with said opening in said auxiliary reflector, projecting from said opening and having a light reflecting inner surface.
2. A spot-light reflector structure as claimed in claim 1 wherein said helical spring is a torsion-type spring having one end abutting against said cylindrical rim and another end abutting against said arm.
3. A spot-light reflector as specified in claim 2 wherein said cylindrical rim of said parabolically shaped member is provided with a substantially cylindrical insert positioned by friction inside said cylindrical rim, wherein a pivot pin pivotally supporting said arm is supported by said insert, and wherein said torsion-type spring is mounted on said pin.
4. A spot-light reflector as specified in claim 1 wherein a small air gap is left between said auxiliary reflector and the space to be occupied by an incandescent lamp.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752532142 DE2532142C2 (en) | 1975-07-18 | Reflector arrangement for an electric narrow-beam luminaire with an approximately punctiform light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062221A true CA1062221A (en) | 1979-09-11 |
Family
ID=5951826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA256,422A Expired CA1062221A (en) | 1975-07-18 | 1976-07-06 | Electric spot-lamp |
Country Status (14)
| Country | Link |
|---|---|
| AT (1) | AT354556B (en) |
| BE (1) | BE842963A (en) |
| CA (1) | CA1062221A (en) |
| CH (1) | CH598537A5 (en) |
| DK (1) | DK146576C (en) |
| ES (1) | ES222018Y (en) |
| FI (1) | FI60067C (en) |
| FR (1) | FR2318382A1 (en) |
| GB (1) | GB1527274A (en) |
| IE (1) | IE43492B1 (en) |
| IT (1) | IT1062468B (en) |
| NL (1) | NL179610C (en) |
| NO (1) | NO139497C (en) |
| SE (1) | SE405505B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004040130A1 (en) * | 2004-08-18 | 2006-02-23 | Aldi Einkauf Gmbh & Co. Ohg | lighting device |
| DE102010003341A1 (en) * | 2010-03-26 | 2011-09-29 | Osram Gesellschaft mit beschränkter Haftung | light unit |
-
1976
- 1976-05-07 AT AT337576A patent/AT354556B/en not_active IP Right Cessation
- 1976-05-12 DK DK208876A patent/DK146576C/en active
- 1976-05-25 NO NO761776A patent/NO139497C/en unknown
- 1976-05-25 FR FR7615763A patent/FR2318382A1/en active Granted
- 1976-06-15 BE BE167929A patent/BE842963A/en not_active IP Right Cessation
- 1976-06-21 SE SE7607098A patent/SE405505B/en not_active IP Right Cessation
- 1976-06-22 CH CH795276A patent/CH598537A5/xx not_active IP Right Cessation
- 1976-06-24 FI FI761851A patent/FI60067C/en not_active IP Right Cessation
- 1976-06-30 GB GB27342/76A patent/GB1527274A/en not_active Expired
- 1976-06-30 ES ES1976222018U patent/ES222018Y/en not_active Expired
- 1976-07-06 CA CA256,422A patent/CA1062221A/en not_active Expired
- 1976-07-14 NL NLAANVRAGE7607789,A patent/NL179610C/en not_active IP Right Cessation
- 1976-07-16 IE IE1582/76A patent/IE43492B1/en unknown
- 1976-07-16 IT IT25392/76A patent/IT1062468B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| BE842963A (en) | 1976-10-01 |
| ES222018Y (en) | 1977-06-16 |
| DK146576C (en) | 1984-05-14 |
| DK208876A (en) | 1977-01-19 |
| IT1062468B (en) | 1984-10-10 |
| FR2318382A1 (en) | 1977-02-11 |
| NL179610C (en) | 1986-10-01 |
| NO761776L (en) | 1977-01-19 |
| NL7607789A (en) | 1977-01-20 |
| DE2532142B1 (en) | 1976-12-02 |
| SE405505B (en) | 1978-12-11 |
| ATA337576A (en) | 1979-06-15 |
| CH598537A5 (en) | 1978-04-28 |
| NO139497C (en) | 1979-03-21 |
| NL179610B (en) | 1986-05-01 |
| SE7607098L (en) | 1977-01-19 |
| DK146576B (en) | 1983-11-07 |
| NO139497B (en) | 1978-12-11 |
| FI60067B (en) | 1981-07-31 |
| FI761851A (en) | 1977-01-19 |
| GB1527274A (en) | 1978-10-04 |
| IE43492L (en) | 1977-01-18 |
| IE43492B1 (en) | 1981-03-11 |
| FI60067C (en) | 1981-11-10 |
| ES222018U (en) | 1977-03-01 |
| AT354556B (en) | 1979-01-10 |
| FR2318382B1 (en) | 1981-05-29 |
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