EP0284117B1 - Lampe électrique à incandescence et ampoule de verre soufflé pour cette lampe - Google Patents

Lampe électrique à incandescence et ampoule de verre soufflé pour cette lampe Download PDF

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Publication number
EP0284117B1
EP0284117B1 EP88200299A EP88200299A EP0284117B1 EP 0284117 B1 EP0284117 B1 EP 0284117B1 EP 88200299 A EP88200299 A EP 88200299A EP 88200299 A EP88200299 A EP 88200299A EP 0284117 B1 EP0284117 B1 EP 0284117B1
Authority
EP
European Patent Office
Prior art keywords
wall portion
lamp
axis
largest diameter
symmetry
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
EP88200299A
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German (de)
English (en)
Other versions
EP0284117A1 (fr
Inventor
Petrus A. J. Holten
Bauke J. Roelevink
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0284117A1 publication Critical patent/EP0284117A1/fr
Application granted granted Critical
Publication of EP0284117B1 publication Critical patent/EP0284117B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
    • H01K1/325—Reflecting coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof

Definitions

  • the invention relates to an electric incandescent lamp comprising:
  • the invention also relates to a blown bulb suitable for use in the lamp.
  • a lamp of this type is known from US-A 2,110,590.
  • the second wall portion together with a reflector arranged within the neck-shaped wall portion constitutes in axial cross-section half an ellipse.
  • the third wall portion is a branch of a parabola which is revolved about an axis parallel to the parabola axis, with the parabola axis being located in between the branch of the parabola and the axis of revolution.
  • the two wall portions are mirror coated and their foci located on a circle coincide and the filament is arranged in the plane through these foci.
  • the known lamp provides a solution to the problem of parabolic reflectors being too narrow in the focal plane if the filament is to be mounted in a deep reflector so as to obtain a satisfactory beam of generated light, and yet avoiding that the transversal dimensions of the lamp exceed a conventional size.
  • the branches of the parabola are moved apart in a axial cross-section, the lamp vessel in the focalplane is wider. Yet the filament in the focal plane is located in a narrow portion of the lamp vessel, far remote from the largest diameter of the lamp vessel.
  • a drawback of the known lamp therefore is that only filaments consuming a relatively low power can be mounted in the lamp vessel in order to avoid overheating of the lamp vessel.
  • Electric lamps having a power value between 15 and 100 W, for example 15, 25, 40, 60, 75 and 100 W intended to be operated at the mains voltage are manufactured in a large number of types. Not only the finish, the coating or the processing, of the lamp vessel wall, but also its shape and the size and shape of the inner parts of the lamp such as the means to keep the filament positioned are different.
  • the electric incandescent lamps for operation at the mains voltage in the said power range include:
  • the lamp vessel widens out considerably from the neck-shaped wall portion. This is in great contrast to the lamp of the above-cited US-A 2,110,590. Even if the lamp has a conventional axial dimension this also results in the possibility of arranging the filament in the proximity of the largest diameter of the lamp vessel and yet positioned deep in the lamp vessel, i.e. relatively close to the neck-shaped wall portion.
  • the electric incandescent lamp has a blown glass lamp vessel 1 which is sealed in a vacuum-tight manner and which has an axis of symmetry 2, a largest diameter 3 transverse to the axis of symmetry and a neck-shaped first wall portion 4 behind the largest diameter 3.
  • the free end of the neck-shaped wall portion 4 carries a lamp cap 5 which has electric contacts 6, 7.
  • the lamp vessel 1 also has an internally concave second wall portion 8, 8', an internally concave third wall portion 9, 9', and an internally concave fourth wall portion 10 located opposite the lamp cap 5 in front of the largest diameter 3.
  • a helically wound filament 11 is arranged about the axis of symmetry 2 substantially in a plane transverse to this axis.
  • the lamp has means 12 to keep the filament positioned and current supply conductors 13 which interconnect the filament 11 and contacts 6, 7 on the lamp cap 5.
  • the second wall portion 8, 8' is curved in axial cross-section substantially in accordance with an arc of a circle and extends mainly in the transversal direction between the neck-shaped wall portion 4 and the largest diameter 3.
  • the centre of curvature 14 of the wall portion 8 is located in front of the largest diameter 3 on the other side of the axis of symmetry 2.
  • the mainly transversal direction in which the wall portion 8 extends implies that the centre of curvature 14 is relatively far remote from the largest diameter 3.
  • the third wall portion 9,9' is an axial cross-section substantially curved in accordance with an arc of a circle and extends substantially in the axial direction in front of the largest diameter 3. (The dimensions of the lamp vessel 1 from the largest diameter 3 increase to a greater extent in the axial direction than they decrease in the transversal direction).
  • the wall portion 9 has a centre of curvature 15 which is located behind the largest diameter 3 on the other side of the axis of symmetry 2.
  • the wall portion 9, 9' gradually merges in the proximity of the largest diameter 3 into the second wall portion 8, 8' .
  • the filament 11 is arranged in the proximity of the largest diameter 3.
  • the fourth wall portion is curved in axial cross-section in a zone remote from the axis of symmetry substantially in accordance with an arc of a circle, the centre of curvature being located proximate to the axis of symmetry and in front of the filament.
  • the lamp may be in the form of a bowl-mirror lamp. In that case the lamp has a reflective coating on the wall portions in front of the filament.
  • Such a lamp may alternatively have, for example a white partly reflective, partly light- transparent coating on said wall portion.
  • FIG. 1 shows this shape.
  • the fourth wall portion 10 has an annular zone 16, 16' remote from the axis of symmetry 2 in which the wall portion in the axial cross-section is substantially curved in accordance with an arc of a circle.
  • the centre of curvature 17 of the zone 16 is located proximate to the axis of symmetry 2 and in front of the filament 11.
  • the fourth wall portion 10 may have a larger radius of curvature, or it may be ogive.
  • a reflective coating with, for example aluminium, silver, cop- per/aluminium, gold is denoted by the reference numeral 19.
  • the Figure shows that the filament 11 is at a relatively large distance from the wall of the lamp vessel 1 in all directions.
  • a lamp vessel 1 of the same shape as in Figure 1 may be entirely transparent or substantially frosted.
  • this lamp vessel may have a light-scattering coating possibly comprising white or coloured pigment.
  • this lamp vessel 2 has a white light-scattering coating on the wall portions 4, 8, 8' and 9, 9' whilst the wall portion 10 is glazed or has a coating which is not pigmented or is pigmented to a slight extent.
  • the lamp emits more light in the forward direction, in directions which extend at a relatively small angle to the axis 2, than when the entire lamp vessel is provided with the same coating.
  • the lamp has a smaller lateral luminance.
  • the same stem 12 can be used to keep the filament 11 positioned.
  • the same means and the same stem can be used to keep the same filament positioned, also when constructing the lamp according to the invention as a reflector lamp.
  • the invention also relates to a blown glass bulb suitable for use in the electric incandescent lamp according to the invention.
  • An important property of the bulb is that it is mechanically strong.
  • the bulb is therefore suitable to be evacuated from manufacturing vacuum lamps or from the manufacture of mirror coatings.
  • the lamp vessel 21 is provided with a mirror coating 29 on its inner surface on the wall portions 8, 8' and 9, 9' as well as on a part of the wall portion 4.
  • Figure 2 shows the radiation path for light which is emitted by the filament at point 11 in the direction of wall portion 9' and which is reflected by this wall portion.
  • the wall portion 9' thus constitutes a screen preventing light from emerging at large angles to the axis 2.
  • the wall portion 9' reflects the incident light backwards to the wall portion 8 which throws the light in forward directions to the exterior through the wall portion 10 which functions as a light window. It is remarkable that although wall portion 9' constitutes a screen to the said light rays the wall portion 9 is no hindrance or substantially no hindrance for the emerging rays reflected by wall portion 8.
  • Figure 3 shows that rays thrown onto wall portion 9' from point 11' of the filament are also reflected to wall portion 8 and are subsequently thrown to the exterior by this portion 8 without wall portion 9 essentially intercepting rays.
  • Figure 5 also shows that rays which are thrown onto wall portion 8' by the filament at 11' are also thrown to the exterior through this wall portion without any hindrance or any substantial hindrance by wall portion 9'.
  • the mirror-coated wall portion 9, 9' thus has a multiple function: a) it prevents the emergence of light at large angles to the axis 2, b) it co-operates with the main reflector which is constituted by the wall portion 8, 8' and c) it is at least substantially no hindrance for rays reflected by this wall portion.
  • the beam components shown in Figure 2-5 are intensified by light which emerges directly without reflection.
  • the mirror coated wall portions 8, 8' and 9, 9' surround the filament 11, 11' in a finished lamp over a spatial angle of approximately 2.5 1t sr so that a considerable part of the generated light is concentrated to a beam, also without a reflector body being arranged in the neck-shaped wall portion 4.
  • the filament may be arranged in various shapes, for example substantially as an open circle or along three sides of an isosceles trapezium.
  • the parabolically curved wall portion has a relief in a zone in the proximity of the neck-shaped wall portion.
  • the wall portion may be roughened, frosted or glazed in this zone.
  • a ripple may be superimposed on the wall portion in the axial cross-section. The amplitude thereof may decrease with an increasing distance to the neck-shaped wall portion.
  • Such a relief can homogenize the luminous intensity in the light beam of the lamp in its reflector design.
  • a ripple superimposed on the second wall portion is very attractive because it can be formed on the bulb while blowing it.
  • the second wall portion 48, 48' of the bulb 41 has a relief in a zone proximate to the neck-shaped wall portion 4.
  • a ripple 49 having an amplitude decreasing with an increasing distance to the neck-shaped wall portion 4 is superimposed on this wall portion.
  • the lamp produced a light beam having a centre value of 550 cd and a beam width of 2x15 °.
  • a commercial reflector lamp of the same power and a largest diameter of 63 mm produces a beam having a centre value of 450 cd at the same beam width.
  • the luminous flux of the lamp according to the invention was 35 % larger than that of the commercial lamp.
  • An electric incandescent lamp also having mirror-coated co-operating wall portions is known from GB 2,097,997.
  • a mirror-coated wall portion widening considerably in the proximity the neck of the lamp vessel is a paraboloid in this lamp.
  • a mirror-coated spherical wall portion is located opposite to it. These two wall portions are connected by an annular wall portion extending in a substantially transversal direction.
  • the known lamp combines the functions which are normally fulfilled by a bowl-mirror lamp together with an external paraboloidal reflector. The spherical reflector throws light on the paraboloidal reflector which has to throw the light to the exterior.
  • the known lamp has a number of drawbacks.
  • the filament is arranged at the largest diameter of the lamp vessel, but it is also surrounded by the spherical wall portion which is located much closer to it. Consequently the lamp can only comprise filaments using a relatively low power.
  • the spherical wall portion throws light on the paraboloidal mirror-coated wall portion but also screens off a considerable part of this wall portion, the more so because the spherical wall portion must be relatively voluminous from a thermal point of view. Finally, due to its shape the known lamp vessel is mechanically relatively weak.
  • an annular screen is arranged inside the lamp vessel and coaxially thereto, this screen being radially surrounded partly by the third wall portion and partly by the fourth wall portion.
  • Such a screen does not or substantially not prevent the passage of the light reflected by a mirror-coated wall portion.
  • this screen prevents that the light emitted directly by the filament without reflection on a mirror-coated wall portion emanates from the lamp vessel at a comparatively large angle to the axis.
  • the screen thus provides for the lamp a higher visual comfort, while the luminous flux in the beam of rays enclosing a small angle with the axis is not or substantially not smaller.
  • the annular screen may be, for example, cylindrical. Alternatively, it is possible that the screen is narrowed towards the fourth wall portion.
  • the screen may be, for example, spherically curved, the point of curvature coinciding with the geometric centre of the filament. Alternatively, the screen may be aspherically curved and may be, for example, ellipsoidal. If such a narrow screen is reflecting, incident light can be reflected to the second mirror-coated wall portion and can be added by this portion to the concentrated light beam.
  • the screen can be supported by the means that hold the filament in position.
  • the screen is supported by springs bearing on the wall of the lamp vessel.
  • springs cooperate with a portion of reduced width in the neck-shaped first wall portion at the area at which it passes into the second mirror-coated wall portion.
  • Such a portion of reduced width in itself already has the advantage that the surface of the second mirror-coated wall portion is comparatively large due to the fact that this wall portion extends comparatively close to the axis and that nevertheless the neck-shaped wall portion is comparatively wide up to the proximity of the lamp cap.
  • the lamp satisfies safety requirements, according to which the lamp cap, after being arranged in a lamp holder, cannot be touched with a standarized test finger.
  • Figure 7 shows such a lamp. Parts of the Figure corresponding to parts of Figure 1 have a reference numeral which is 60 higher.
  • the lamp vessel 61 has a part of reduced width 80 at the area at which the first neck-shaped wall portion 64 passes into the second wall portion 68,68'.
  • the second wall portion 68,68' and the third wall portion 69,69' have a mirror coating 79.
  • An annular screen 81 is arranged inside the lamp vessel 61 and coaxially thereto, this screen being radially surrounded partly by the third mirror-coated wall portion 69,69' and partly by the fourth wall portion 70.
  • the screen 81 is supported by resilient wires 82,83, which cooperate with the portion of reduced width 80.
  • the screen 81 intercepts the light rays a and b and all the rays therebetween, which would otherwise emanate from the lamp vessel, i.e. the ray a and adjacent rays at a comparatively large angle to the axis 62. Due to its spherical shape, the screen reflects incident radiation to the second wall portion 68,68', which adds this radiation to the beam of rays.
  • the screen may consist of a variety of metals, for example aluminium, chromium-nickel steel, molyndenum and the like.

Claims (10)

1. Lampe à incandescence électrique comprenant: - une ampoule de lampe en verre soufflée (1, 61) fermée d'une façon étanche au vide et présentant un axe de symétrie (2, 62) le diamètre le plus grand (3, 63) dans un plan transversal à l'axe de symétrie, une première partie de paroi (4, 64) en forme de col disposée derrière le plan du diamètre le plus grand, l'extrémité libre de ladite partie de paroi supportant un culot de lampe (5, 65) muni de contacts électriques (6, 7, 66, 67) une deuxième partie de paroi concave intérieure (8, 8', 48, 48', 68, 68') une troisième partie de paroi concave intérieure (9, 9', 69, 69') une quatrième partie de paroi concave intérieure (10, 70) située à l'opposé du culot de lampe devant le plan du diamètre le plus grand, un filament enroulé hélicoïdalement (11, 71) disposé autour de l'axe de symétrie pratiquement dans un plan transversal audit axe, des moyens (12, 72) assurant le positionnement du filament, des entrées de courant (13, 73) assurant l'interconnexion du filament et des contacts du culot de la lampe, caractérisé en ce que
- la deuxième partie de paroi est pratiquement courbée selon un arc d'un cercle dans chaque section axiale, d'un côté de l'axe de symétrie et s'étend essentiellement dans la direction transversale entre la partie de paroi en forme de col et le diamètre le plus grand, le centre de courbure (14) étant situé devant le plan du diamètre le plus grand de l'autre côté de l'axe de symétrie,
- la troisième partie de paroi est pratiquement courbée selon un arc de cercle dans chaque section axiale, d'un côté de l'axe de symétrie, et s'étend essentiellement dans la direction axiale devant le plan du diamètre le plus grand, le centre de courbure (15) étant situé derrière le plan du diamètre le plus grand et de l'autre côté de l'axe de symétrie, ladite partie de paroi se raccordant à la deuxième partie de paroi à proximité du plan du diamètre le plus grand,
- le filament est disposé à proximité du plan du diamètre le plus grand.
2. Lampe à incadescence électrique selon la revendication 1, caractérisé en ce que la quatrième partie de paroi dans une zone (16, 16') éloignée de l'axe de symétrie en section axiale est pratiquement courbée selon un arc d'un cercle, le centre de courbure (17, 1 T) étant situé à proximité de l'axe de symétrie et devant le filament.
3. Lampe à incandescence électrique selon la revendication 1, caractérisée en ce que la partie de paroi en forme de col présente une partie (80) de largeur réduite à l'endroit où cette partie de paroi se raccorde à la deuxième partie de paroi.
4. Lampe à incandescence électrique selon la revendication 1 ou 3, caractérisée en ce que la deuxième partie de paroi et la troisième partie de paroi sont argentées.
5. Lampe à incandescence électrique selon la revendication 1 ou 4, caractérisée en ce que la deuxième partie de paroi présente une structure de relief (49) dans une zone située près de la partie de paroi en forme de col.
6. Lampe à incandescence électrique selon la revendication 4 ou 5, caractérisée en ce qu'un écran annulaire (81) est disposé dans l'ampoule de lampe et d'une façon coaxiale, cet écran est radialement entouré partiellement de la troisième partie de paroi et partiellement de la quatrième partie de paroi.
7. Lampe à incandescence électrique selon la revendication 6, caractérisée en ce que l'écran est rétréci près de la quatrième partie de paroi.
8. Lampe à incandescence électrique selon la revendication 6 ou 7, caractérisée en ce que l'écran annulaire est supporté par des ressorts (82 et 83) qui s'appliquent contre la paroi de l'ampoule de la lampe.
9. Lampe à incandescence électrique selon la revendication 8, caractérisée en ce que les ressorts coopèrent avec une partie (80) de largeur réduite dans la partie de paroi en forme de col.
10. Ampoule en verre soufflée comprenant tous les caractéristiques de l'ampoule de verre soufflée de la lampe à incandescence électrique revendiquée dans l'une des revendications précédentes.
EP88200299A 1987-02-25 1988-02-19 Lampe électrique à incandescence et ampoule de verre soufflé pour cette lampe Expired - Lifetime EP0284117B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8700465 1987-02-25
NL8700465 1987-02-25
NL8702968A NL8702968A (nl) 1987-02-25 1987-12-09 Elektrische gloeilamp en geblazen ballon daarvoor.
NL8702968 1987-12-09

Publications (2)

Publication Number Publication Date
EP0284117A1 EP0284117A1 (fr) 1988-09-28
EP0284117B1 true EP0284117B1 (fr) 1990-09-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200299A Expired - Lifetime EP0284117B1 (fr) 1987-02-25 1988-02-19 Lampe électrique à incandescence et ampoule de verre soufflé pour cette lampe

Country Status (8)

Country Link
EP (1) EP0284117B1 (fr)
JP (1) JPH07105213B2 (fr)
KR (1) KR970003356B1 (fr)
CN (1) CN1010356B (fr)
DE (1) DE3860539D1 (fr)
ES (1) ES2018070B3 (fr)
HU (1) HU197119B (fr)
NL (1) NL8702968A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084648A (en) * 1989-07-27 1992-01-28 U.S. Philips Corporation Electric reflector lamp
EP0527528A1 (fr) * 1991-08-09 1993-02-17 Koninklijke Philips Electronics N.V. Source de lumière électrique munie d'un réflecteur; ampoule soufflée et réflecteur pour être utilisé dans l'ampoule
US9899207B2 (en) 2013-10-09 2018-02-20 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097997A (en) * 1981-04-16 1982-11-10 Philips Nv Electric reflector lamp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2110590A (en) * 1936-09-11 1938-03-08 Birdseye Electric Corp Reflecting incandescent lamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2097997A (en) * 1981-04-16 1982-11-10 Philips Nv Electric reflector lamp

Also Published As

Publication number Publication date
JPS63226870A (ja) 1988-09-21
DE3860539D1 (de) 1990-10-11
KR970003356B1 (ko) 1997-03-17
CN88101469A (zh) 1988-09-14
HUT46472A (en) 1988-10-28
NL8702968A (nl) 1988-09-16
HU197119B (en) 1989-02-28
ES2018070B3 (es) 1991-03-16
KR880010471A (ko) 1988-10-10
CN1010356B (zh) 1990-11-07
JPH07105213B2 (ja) 1995-11-13
EP0284117A1 (fr) 1988-09-28

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