EP0419084B1 - Lampe à enveloppe réflectrice - Google Patents

Lampe à enveloppe réflectrice Download PDF

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Publication number
EP0419084B1
EP0419084B1 EP19900309646 EP90309646A EP0419084B1 EP 0419084 B1 EP0419084 B1 EP 0419084B1 EP 19900309646 EP19900309646 EP 19900309646 EP 90309646 A EP90309646 A EP 90309646A EP 0419084 B1 EP0419084 B1 EP 0419084B1
Authority
EP
European Patent Office
Prior art keywords
reflecting body
lamp
front element
conical
clearance
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 - Lifetime
Application number
EP19900309646
Other languages
German (de)
English (en)
Other versions
EP0419084A3 (en
EP0419084A2 (fr
Inventor
Gyozone Horvath
Zoltan Losonczi
Gyorgy Szabo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tungsram Rt
Original Assignee
Tungsram Rt
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Filing date
Publication date
Application filed by Tungsram Rt filed Critical Tungsram Rt
Publication of EP0419084A2 publication Critical patent/EP0419084A2/fr
Publication of EP0419084A3 publication Critical patent/EP0419084A3/en
Application granted granted Critical
Publication of EP0419084B1 publication Critical patent/EP0419084B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/34—Double wall vessels

Definitions

  • the present invention refers to a lamp with a reflector envelope according to the first part of claim 1 of modified light output.
  • the lamp is made with a conical reflecting body, in given case covered by a thin dichroic or metallic layer, an insert lamp emitting light, preferably a halogen incandescent lamp and a front element fixed to the conical body in a mechanical way or by adhesion.
  • a lamp according to the first part of claim 1 is known from US-A-3 130 924, which will be discussed later.
  • lamps with reflector envelope equipped with a halogen incandescent insert lamp of modified light are gradually increasing. They are very advantageous for illumination objects arranged in a shop-window, but they are very often used for general lighting purposes owing in first line to the fact that they give a concentrated illumination at low energy consumption.
  • the lamps having reflector envelope came firstly in general use in opened embodiments, i.e. they did not comprise a front element, as can be found for example in the patent specifications nos. US-A-4 021 659, US-A-4 169 237 and US-A-4 169 237 and US-A-4 169 238.
  • the conical reflecting body was united with a front element and so a closed envelope was received.
  • the front element is either simply a light transmitting plate matching the front surface of the conical element or an edge extending from the front surface of the conical element, or it constitutes a special optical element modifying the light emitted by the insert lamp due its structure.
  • GB-A-2 034 016 which describes a reflector lamp having a conical pressed glass reflector with a dichroic coating on its inner surface, a halogen lamp mounted in the pressed glass reflector. and a front glass plate bonded directly to the pressed glass reflector.
  • Another such lamp is described in US-A-3 130 924 and comprises a reflector envelope having a light transmitting front element fixed thereto by a clamping member, with a sealing strip arranged between the reflector envelope and the light transmitting front element.
  • the rigid fixation made by adhesive is not durable enough. especially not in the case of insert light source consisted of a halogen incandescent lamp.
  • the recess made on the front surface of the conical reflecting body should be prepared so that the front element match by its mantle surface the edge through a substantially small matching clearance. This is important because the conical reflecting body made of hard glass having linear thermal expansion coefficient of about 36 ⁇ 10 ⁇ 6 cm/cm.°C value should be kept together with the front element of generally highly differing thermal expension coefficient by the adhesive applied.
  • the thermal movements cause the adhesive bond to crack and gradually to decompose during the work of the lamp.
  • the adhesive bond will slowly leave and between the front element and the conical body a harmful resonance comes into being. If the lamp is applied upwardly or in horizontal position it is a further problem that the cracked adhesive bond after a time cannot ensure further keeping of the front element which falls out from the conical body.
  • the present invention is intended to create a solution for avoiding the drawbacks shown above in the case of lamps equipped with a reflector envelope closed by a front element and to ensure a reliable assembly of the lamps.
  • a lamp should be prepared, wherein the mechanical fixing element can in an unambiguous way determine the position of the front element fixed on the front surface or the edge of the conical reflecting body and the clearance made therebetween.
  • the shape and the elastic deformation of the fixing element can influence the dimension of the clearance in an interdependent way. This interdependency means that the two factors should be harmonized in order to give a satisfactory solution to the known problems depicted above.
  • the clearance regulated to the required value should be filled at least partly with a deformable thermoresistant sealing material.
  • the invention is based on the recognition that the stability of the adhesive or sealing material introduced between the front surfaces of the (e.g. conical) reflecting body and the front element can be ensured if the dimension of the clearance is predetermined with high accuracy by an elastic fixing element which presses to one another the two elements to be assembled by the means of a sealing materials with predetermined force.
  • an elastic fixing element which presses to one another the two elements to be assembled by the means of a sealing materials with predetermined force.
  • a disc can be applied which is equipped with ears surrounding the front element and the edge of the conical reflecting body.
  • the invention i.e. a lamp having a reflector envelope was created, which ensures modified light output and is equipped with a front element which is free of the drawback characterizing the state of the art, can be made with material savings. and during the life period determined by the insert lamp works reliably from both optical and mechanical aspects.
  • a lamp with a reflector envelope comprising a reflecting body, an insert light source arranged within the reflecting body, and a light-transmitting front element fixed to the reflecting body by means of a mechanical fixing body, the reflecting body and the front element having therebetween a clearance at least partially occupied by sealing means, characterised in that the mechanical fixing body comprises a ring formed of elastic material having a plurality of curved fixing ears arranged along its periphery to engage the reflecting body in that the size of the clearance is determined by the dimensions and the inner spring force of the mechanical fixing body connecting the reflecting body to the front element, and in that the sealing means constitutes a deformable sealing material.
  • the mechanical fixing element preferably has at least three curved ears arranged along its periphery equipped with at least one cam. or rather with at least one lug.
  • the deformable sealing material consists preferably of teflon or silicone rubber or a thermoresistive adhesive.
  • the invention proposes a novel construction of a reflector lamp 1 shown in Figs. 1 and 2, comprising a quasi-conical reflecting body 2 made of glass and carrying, if necessary, on its inner surface a dichroic or metallic layer for determining and in given case for modifying the spectral composition of the light emitted by the reflector lamp 1.
  • the inner surface of the conical reflecting body 2 is shaped according to the known principles, e.g. as a paraboloid having an opening closed by a front element 3.
  • an insert lamp 4 is arranged at the closed end of the conical reflecting body.
  • the front element 3 is connected with the conical reflecting body 2 by the means of a fixing element 5 and either a sealing material 6 or an adhesive filling at least partly a clearance 10 between the front element 3 and the conical reflecting body 2.
  • the fixing element 5 is equipped with at least one ear 7 equipped with at least one cam or projection (Figs. 1 and 3) or with at least one lug 8 (Fig. 2) matching by their inner surface corresponding intrusions 12 made in the outer surface of the conical reflecting body 2.
  • the fixing element 5 ensures a mechanical pressure uniting the front element 3 with the conical reflecting body 2 (Fig. 3).
  • the upper part of the fixing element 5 is a ring with an inner opening 11 wherein the width of the ring is selected so that the fixing element 5 does not shield the light output of the proposed reflector lamp to an appreciable extent.
  • the insert lamp 4 is fixed which is generally a halogen incandescent lamp and the drawing (Fig. 1 and 2) shows also such lamps.
  • the deformable sealing material 6 or adhesive is either pasted to or placed on the front surface of the conical body 2 or in a recess constituted by the edge of the conical reflecting body 2 and the front element 3.
  • the thickness of the layer or rather of the ring of the deformable sealing material is determined by both the shape and the inner spring force of the fixing element 5. This should be such that the fixing element 5 should be able to exert pressure through the front element 3 on the deformable sealing material 6.
  • the tolerance limits are very narrow in the case of a predetermined fixing element 5, for example the dimensional fluctuation may be about ⁇ 0.05 mm2 in the case of lamps of the same type.
  • the front element 3 is placed on the conical body 2 and the fixing element 5 is snapped on the fixture.
  • the modulus of elasticity of the fixing element 5 is preferably about 2.8 ⁇ 107 N/mm2; generally an element made of steel and having thickness about 0.15 mm is applied, wherein the width is determined by the fact that it should screen the light emitted by the insert lamp 4 to the least possible extent, but it should be wide enough to be reliably supported on the front element 3.
  • the length of the ears 7 is determined from one side by the thickness of the front element 3 and from the other side by the fact that they should safely grasp the conical body 2. This is ensured by the cams 9 in the case of lamps shown in Figures 1 and 3 and by one or more lugs 8 in the case of the embodiment shown in Fig. 2.
  • the insert lamp 4 is a 12 V, 50 W halogen incandescent lamp having life period about 3000 hours and this is characteristic for the life period of the lamp illuminating a shop-window.
  • the conical body 2 is made of pressed glass and is not equipped with any thin layer. Its greatest diameter amounts about 5 cm; the front surface has a rim.
  • the front element 3 is a lens made of pressed glass which directs accordingly the light emitted by the insert lamp 4. Its diameter amounts to about 4.7 cm, the thickness is according to the height of the edge of the conical reflecting body 2 about 1 mm; it is slightly convex .
  • a similar lamp 1 is shown in Fig. 2.
  • the sealing material 6 is arranged in the form of a silicone ring having a cross-sectional area of 1.1 mm2.
  • the fixing element 5 is a steel disc having an opening 11 cut out in the middle part and equipped with eyed ears 7 arranged equispacedly along the outer periphery.
  • the outer diameter of the disc is about 5 cm
  • the inner diameter hence, the diameter of the inner opening 11 is about 4.2 cm
  • the thickness of its material is about 0.15 mm.
  • the force of deformation exerted by the fixing element 5 is about 0.5 N.
  • the mentioned force determines a clearance 10 of about 1.09 mm thickness between the conical body 2 and the front element 3. Because the diameter of the sealing material 6, i.e. the silicone ring is 1.1 mm, it is about 0.01 mm thicker than the thickness of the clearance 10 to be adjusted. This difference is equalized by the deformation of the silicone rubber.
  • the lamp for illuminating shop-windows remained as an integral unit during the whole life period.
  • 10 trial lamps were ignited and in no case did any displacement of the front element 3 with regard to the conical reflecting body 2 occur.
  • a lamp realized according to the present invention is especially advantageous in the case where the coefficients of thermal expansion of the materials of the conical reflecting body and of the front element differ significantly.
  • the adhesive bond will very probably lose its ability to bind before the end of the life period of the insert lamp and this must be avoided.

Landscapes

  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (5)

  1. Une lampe à enveloppe réflectrice, comprenant un corps réfléchissant (2), une source de lumière (4) formant insert, agencée avec le corps réfléchissant (2) et un élément avant (3) transmettant la lumière, fixé au corps réfléchissant (2) au moyen d'un corps de fixation mécanique (5), le corps réfléchissant (2) et l'élément avant (3) comportant, entre eux, un jeu (10) occupé au moins partiellement par des moyens d'étanchéité (6), caractérisée en ce que le corps de fixation mécanique (5) comprend un anneau constitué d'un matériau élastique ayant une pluralité d'oreilles de fixation incurvées (7), disposées sur sa périphérie pour venir en contact avec le corps réfléchissant (2), en ce que la taille du jeu (10) est déterminée par les dimensions et par la force élastique interne du corps de fixation mécanique (5) reliant le corps réfléchissant (2) à l'élément avant (3) et en ce que les moyens d'étanchéité (6) constituent un matériau d'étanchéité déformable (6).
  2. Une lampe selon la revendication 1, caractérisée en ce que le corps de fixation (5) comporte au moins trois oreilles incurvées (7), chacune équipée d'au moins une came (9) ou d'au moins une patte (8).
  3. Une lampe selon la revendication 1 ou 2 caractérisée en ce que le matériau d'étanchéité (6) situé dans le jeu (10) est réalisé en téflon ou en élastomère silicone.
  4. Une lampe selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que le matériau d'étanchéité (6) est un adhésif résistant à la chaleur.
  5. Une lampe selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps réfléchissant (2) est réalisé en verre moulé recouvert sur sa surface intérieure d'une couche dichroïque ou métallique, la source lumineuse (4) formant insert étant une lampe à incondescence à halogène, et l'élément avant transmettant la lumière (3) constituant un organe en forme de lentille fixé au corps réfléchissant conique (2).
EP19900309646 1989-09-22 1990-09-04 Lampe à enveloppe réflectrice Expired - Lifetime EP0419084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU497289A HU204335B (en) 1989-09-22 1989-09-22 Reactor lamp of modified light
HU497289 1989-09-22

Publications (3)

Publication Number Publication Date
EP0419084A2 EP0419084A2 (fr) 1991-03-27
EP0419084A3 EP0419084A3 (en) 1991-08-07
EP0419084B1 true EP0419084B1 (fr) 1995-03-15

Family

ID=10969401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900309646 Expired - Lifetime EP0419084B1 (fr) 1989-09-22 1990-09-04 Lampe à enveloppe réflectrice

Country Status (3)

Country Link
EP (1) EP0419084B1 (fr)
DE (1) DE69017812D1 (fr)
HU (1) HU204335B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438684A (en) * 1945-06-16 1948-03-30 Grover C Singer Electric lamp
US3130924A (en) * 1961-09-27 1964-04-28 John W Gish Non-glare lamp
GB2034016B (en) * 1978-10-16 1982-08-11 Thorn Electrical Ind Ltd Reflector lamp
DE8912631U1 (de) * 1989-10-25 1989-12-21 Herbert Waldmann GmbH & Co, 7730 Villingen-Schwenningen Maschinenleuchte

Also Published As

Publication number Publication date
DE69017812D1 (de) 1995-04-20
HU204335B (en) 1991-12-30
EP0419084A3 (en) 1991-08-07
HUT55520A (en) 1991-05-28
EP0419084A2 (fr) 1991-03-27

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