IE43492B1 - A reflector arrangement for a lamp - Google Patents

A reflector arrangement for a lamp

Info

Publication number
IE43492B1
IE43492B1 IE1582/76A IE158276A IE43492B1 IE 43492 B1 IE43492 B1 IE 43492B1 IE 1582/76 A IE1582/76 A IE 1582/76A IE 158276 A IE158276 A IE 158276A IE 43492 B1 IE43492 B1 IE 43492B1
Authority
IE
Ireland
Prior art keywords
reflector
auxiliary
bulb
central opening
light
Prior art date
Application number
IE1582/76A
Other versions
IE43492L (en
Original Assignee
Hoffmeister Leuchten Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19752532142 external-priority patent/DE2532142C2/en
Application filed by Hoffmeister Leuchten Kg filed Critical Hoffmeister Leuchten Kg
Publication of IE43492L publication Critical patent/IE43492L/en
Publication of IE43492B1 publication Critical patent/IE43492B1/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

1527274 Lamps FA HOFFMEISTERLEUCHTEN KG 30 June 1976 [18 July 1975] 27342/76 Heading F4R A lamp comprises a parabolic main reflector 1 having a central opening 1e to receive the neck of a bulb 3 and a hemispherical auxiliary reflector 4 removably mounted in front of the bulb to reflect a proportion of the light back on to the main reflector, the auxiliary reflector having a central opening 4a in front of the bulb. Light emerging directly through the opening 4a is controlled by a parabolic reflective screen 4b integral with the auxiliary reflector and confocal with the main reflector. The reflector 4 is carried by a lever 6 pivoted at 8 to a circular band 5 mounted inside a cylindrical extension 1c of the main reflector, and can be pivoted downwardly against the action of a spring 7 to enable the bulb to be inserted or removed. The bulb or the auxiliary reflector may be axially adjustable to vary the shape of the light beam. In a modification the reflector 4 is mounted in the centre of a lattice or grating supported by the extension 1c.

Description

The present invention relates to a reflector arrange»··, ent for a narrow beam electric lamp having a substantially pnnctifona light source, which permits the light produced thereby io be emitted in a :-.-.riw bean.
A known reflector arrangement for a narrow beam electric lamp having a substantially punctiform light source, comprises a parabolically curved main reflector with a central opening for receiving the neck of the light bulb and a substantially hemispherical auxiliary reflector removably located in front of the bulb to enable changing of the bulbs, which reflector reflects the light radiated forwardly by the light source onto auxiliary the main reflectoro The/reflector is supported on the light bulb and is retained by two oppositely arranged tension coil springs formed of steel wire or by flat springs which are secured by a rivet passed through a hole in tho main reflector. In this light fitting a proportion of the light is reflected from the auxiliary reflector into the central opening of the main reflector, is not radiated forwardly and hence does not contribute to the illumination, but is converted into heat.
Changing of the bulb by detaching the two retaining springs is, in addition, very cumbersome. Also the inside surface of the main reflector is easily spoilt due to finger contact.
The object of the invention is to provide a narrow beam lamp having an auxiliary reflector constructed in such a manner '5 that also the proportion of light beam which would have been reflected towards the central opening of the main reflector receiving the neck of the bulb, is radiated forwardly to increase the light yield.
Further, it is intended also to reduce the heat ) accumulation created by the proportion of light beam not radiated and thus increase the life of the lamp. - 2 43492 According to tha present invention there is provided a reflector arrangement for a narrow beam electric lamp having a substantially punctiform light source, comprising a perabolically cui'ved main reflector with a central opening for receiving the neck of a light bulb and a hemispherical auxiliary reflector removably mounted in front of the bulb, ,auxiliary which 'reflector reflects a proportion of the light radiated forwardly from the light source onto the main reflector, ihe auxiliary reflector having a central opening in front of the bulb.
This development of the auxiliary reflector provides the that the proportion of/light beam hitherto reflected into the central opening of the main reflector is emitted directly outwards through the central opening of the auxiliary reflector which enhances the beam of light rays radiated parallel by the main reflector. The size of tho central opening of the auxiliary reflector is conditioned by the size of the central opening of the main reflector and by the spacing of the S filament of the lamp,which constitute/a substantially punctiform light source, from the central opening of the main reflector and the central opening of the auxiliary reflector. The rays passing from the filament to the central opening of tho main reflector and to the central opening of the auxiliary reflector create a geometrically similar relationship, according to which relationship the size of the opening in the main reflector is proportional to the size of the central opening of tho auxiliary reflector, and the quotient of the spacings of the filaments from the central opening^ of the main reflector and of the auxiliary reflector.
Since, in narrow beam lamps, only the light radiated directly into the central opening of the main reflector Is lost, multi-purpose lamps (conventional lamps) may be used, - 3 4S4S2 which in comparison, with the whole i-eflector surface of the main reflector require a relatively large opening for receiving the holder in tho main reflector. Nevertheless, the light flow compared with 3.amps having a hemispherical closed auxiliary reflector io substantially increased.
In order also to focus the light beam passing through the central opening of the auxiliary reflector a screen may be located on the auxiliary reflector directly adjacent to Its central opening, which screen laterally restricts the light beam passing through, reflecting it on its inside surface. The diverted light rays impact this screen and are reflected towards the lamp axis and so in any case are made less divergent. The auxiliary reflector and screen may be united into a single component.
A still better focusing of this light is obtained if the inside surface of the screen ig formed parabolically, whereby the focal point of this parabolic surface coincides with tho focal point of the parabolical surface of the main reflector. With this development the light rays incident 2θ thoroon are forwardly reflected parallel to the optical axis and hence parallel to the light rays reflected from the main reflector. Tire divergent light passing through the central opening of the auxiliai-y reflector is hence also extensively aligned parallel to tho axis, so that there is obtained a substantial reinforcing of the light in tho central region the of/beam radiated from the main reflector.
Further, the auxiliary reflector may be secured to the end of a radial lever which Is retained in a cylindrical edge region formed cylindrically on the outer circumference of the parabolically curved main reflector. For enabling replacement of the bulb, the lever carrying the auxiliary - 4 4 3 4 8 leflector ia pivotally i ,iunLed and retained in position by a coil spring. This mounting in comparison with tho direct r/.i'iitinj of tho auxiliary reflector on the glass bulb of tho lamp, e.g. by means of spiral spring secured in holes of the jioin reflector presents the advantage that tho auxiliary reflector securely assumes and retains its symmetrical position relative to the light axis. The lever as carrier for the auxiliary reflector also permits a bulb which is still hot to be replaced without having to release the said retaining springs by hand and to secure them again.
The present invention will be described further, by way of example, with reference to the accompiuxying drawings, in whicht fig.l shows a schematic axial section through a reflector arrftiigement for a narrow beam lamp with a standard bulb inserted} and Fig.2 is a partial front view of the reflector arrangement.
According to Fig.1 a reflector arrangement for a narrow beam lamp comprises a parabolic main reflector 1, the outer edge of which merges into a cylindrical region 1 having an inwardly bevelled edge. The main reflector 1 has a central opening 1° which is adjoined on the outside by a schematically a shown socket 2 having a lamp holder, into which the neck 3 of a bulb 3 is screwed. A flat band 5 abuts with force fit against tho inside surface of the cylindrical region 1 of the main reflector 1. The two ends 5& of the band 5 (Fig.2) are bent inwardly substantially at right angles to the hoop so that they extend in parallel to and spaced apart from each other. The ends ^ara connected by a bolt 8 on which a support lever 6 is pivotally mounted. On the inner end of the support lever 6 a hemispherical auxiliary reflector 4 is mounted, having a central opening 4 and a parabolic screen 4 · - 5 The support lever 6 is retained in the position shown in Fig.1 by a coil spring 7 so that only a small spacing C between roflector 4 and the bulb 3 remains» The coil spring 7 located on the bolt 8 is supported with one end ed d support/on a pin 1 provided on the cylindrical edge region 1C of the main reflector 1 and with the other end supported against a pin 6a provided on the support lever 6. The support lever 6 carrying the auxiliary reflector 4 may be pivoted in o clockwise direction (Fig.1) against the tension of the spring 7 for the insertion or replacement of a bulb 3» The spring 7 not only retains the auxiliary x-efloctor 4 almost in abutment against the glass bulb 3^ of the lamp 3» but it nlso forces the ends f of tho band 5 apart so that a good force fit of the band 5 in the cylindrical edge region 1° is obtained. Thaband 5 may have a smaller width than shown in Fig.1 so that the whole arrangement 4 to 8 is axially displaceable in order to enable the spacing C of the auxiliary reflector 4 from the glass bulb 3^ of the lamp 3 to be varied and thereby to regulate !0 the passage of air entering the space behind the shade 4, 4^, 4a for cooling the light bulb 3· Constant overheating of the lamp 3 due to the heat accumulation in the regions C would according to experience lead to reduction of the life of the lamp. j- 12 s Figol shows that light rays χ , x emitted by the filament and forwardly reflected hy the parabolic surface of the main reflector 1 leave the lamp parallel to one another Rays emitted to the rear by the filament 3° within the limits A in the solid angle cC pass through the opening 1θ of the ι main reflector 1 onto the lamp socket 3a or the lamp holder where they are lost hy conversion into heat. On the other hand, the light rays within the limits B (light in the solid - 6 43492 angle /5 ) are projected forwardly directly through the central opening 4a, herein of 25 mm diameter. Hence an edge region of this light which falls onto the reflecting inside surfi-eo ef the parabolic sha.de 4b is iet’leet· λ) 2 parallel to tho lamp axis and hence to the rays x and x .
Whilst a proportion of light emitted by the filament c β onto the region surrounding the opening 1 of the main reflector 4, which is not inwardly curved, is reflected into the auxiliary reflector 4, the inwardly curved annular region 1b of the main reflector shown on the right hand side of the opening 1θ in K.ig,1 provides the advantage that the light rays arriving from the filament 3° are reflected past the auxiliary reflector 4 (ray jr) so that an additional increase of the radiant light is produced thereby.
J3y axial displacement of the lamp 3 ih accordance With the two arrows u (Fig.1) the filament 3° may be caused to assume a position in front of or behind the focal point of the parabolic reflector 1. Consequently, the lamp may then supply a convergent, parallel, or divergent beam of light.
The axial displaceability of the lamp 3 corresponds to an axial displaceability of the auxiliary reflector 4 - not shown which also provides the possibility of reducing the loss of light, and adjustment of the convergence or divergence of the beam. The auxiliary reflector 4 may also be mounted in the lattice or , centre of a known flat / grating/insertable in the main reflector 1 and supported at the / cylindrical edge region 1 for preventing dazzle. In this arrangement of auxiliary reflector and lattice grating the support lever 6 may be omitted and the screen mounted on the lattice

Claims (5)

1. O A reflector arrangement for a narrow beam electric lamp having a substantially punctifonn light source, comprising a parabolically curved main reflector izith a central opening for receiving the neck of a light bulb and a hemispherical auxiliary reflector removably mounted in front of the bulb auxiliary which/reflector reflects a proportion of the light radiated forwardly from the light source onto the main reflector, the auxiliary reflector having a central opening in front of the bulbo
2. A reflector arrangement according to claim 1, in which adjacent to the central opening of the auxiliary reflector a screen provided which is reflecting on its inside surface and laterally defines the light beam passing through.
3. » A reflector according to claim 2 in which the inside surface of the screen of the auxiliary reflector is parabolic, the focal point of this parabolic surface coinciding with the focal point of the parabolic inside surface of the main reflector, ho A reflector arrangement according to claim 1, 2 or 3 in which the auxiliary reflector is secured at the end of a radial lever which lever is pivotally mounted in a cylindrical edge region formed on the outer circumference of the parabolically curved main reflector, to enable the auxiliary reflector to be pivoted outwards against the action of a coil spring, 56 A reflector arrangement according to claims 1, 2 or 3» in which the region adjacent to a central opening of the main reflector is curved inwards deviating from tho parabolic shape„ = 8 43492
4. 6, A reflector arrangement according to claims 1, 2 or 3 in which the auxiliary reflector ia mounted on a lattice or grating supported on the wain reflector.
5. 7. A reflector arrangement substantially na herein described with reference to and as illustrated in tho accompanying drawings.
IE1582/76A 1975-07-18 1976-07-16 A reflector arrangement for a lamp IE43492B1 (en)

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 (2)

Publication Number Publication Date
IE43492L IE43492L (en) 1977-01-18
IE43492B1 true IE43492B1 (en) 1981-03-11

Family

ID=5951826

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1582/76A IE43492B1 (en) 1975-07-18 1976-07-16 A reflector arrangement for a 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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
NL179610C (en) 1986-10-01
CH598537A5 (en) 1978-04-28
NO761776L (en) 1977-01-19
NO139497B (en) 1978-12-11
DK208876A (en) 1977-01-19
ES222018Y (en) 1977-06-16
SE7607098L (en) 1977-01-19
CA1062221A (en) 1979-09-11
GB1527274A (en) 1978-10-04
SE405505B (en) 1978-12-11
DE2532142B1 (en) 1976-12-02
DK146576B (en) 1983-11-07
IT1062468B (en) 1984-10-10
FI60067C (en) 1981-11-10
IE43492L (en) 1977-01-18
DK146576C (en) 1984-05-14
NL179610B (en) 1986-05-01
NL7607789A (en) 1977-01-20
FR2318382A1 (en) 1977-02-11
AT354556B (en) 1979-01-10
FI761851A (en) 1977-01-19
BE842963A (en) 1976-10-01
FR2318382B1 (en) 1981-05-29
FI60067B (en) 1981-07-31
NO139497C (en) 1979-03-21
ES222018U (en) 1977-03-01
ATA337576A (en) 1979-06-15

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