EP0062713B1 - Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode - Google Patents

Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode Download PDF

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Publication number
EP0062713B1
EP0062713B1 EP81301574A EP81301574A EP0062713B1 EP 0062713 B1 EP0062713 B1 EP 0062713B1 EP 81301574 A EP81301574 A EP 81301574A EP 81301574 A EP81301574 A EP 81301574A EP 0062713 B1 EP0062713 B1 EP 0062713B1
Authority
EP
European Patent Office
Prior art keywords
envelope
fluorescent lamp
openings
exhaust tube
pair
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
Application number
EP81301574A
Other languages
German (de)
English (en)
Other versions
EP0062713A1 (fr
Inventor
Kinji Kaneko
Koshiro Sugibuchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to EP81301574A priority Critical patent/EP0062713B1/fr
Priority to DE8181301574T priority patent/DE3172957D1/de
Publication of EP0062713A1 publication Critical patent/EP0062713A1/fr
Application granted granted Critical
Publication of EP0062713B1 publication Critical patent/EP0062713B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers

Definitions

  • the present invention relates to a fluorescent lamp and a method of manufacturing a fluorescent lamp.
  • Fluorescent lamps have been used as a general source of illumination for many years.
  • a fluorescent lamp has high lighting efficiency and a low consumption of electric power in comparison with an incandescent lamp and a fluorescent lamp employing a base of an incandescent lamp, e.g. a screw base, has been developed.
  • a fluorescent lamp employing a base of an incandescent lamp, e.g. a screw base, has been developed.
  • it is necessary for the fluorescent lamp to have a folded envelope because, in order to obtain about the same brightness as with an incandescent lamp, it is necessary for the fluorescent lamp's envelope to have a certain length.
  • Such a fluorescent lamp is known, for example, from U.S. Patents Nos. - 3 551 736 and 4 199 708.
  • Such a folded or winding envelope is usually surrounded with a bowl or a cover. Consequently, the temperature of the fluorescent lamp rises on account of heat being retained in the bowl, the resulting heat causing the lighting efficiency of the lamp to fall
  • An object of the present invention is to provide a fluorescent lamp with a winding envelope which has a uniform phosphor coating.
  • a fluorescent lamp which comprises a winding envelope, the method including the steps of:
  • a fluorescent lamp produced by such a method comprising:
  • a bowl-shaped base member 1 having a plurality of ventilating holes 1' provides a conventional incandescent lamp base 2 at one end thereof and at the other end of the base member 1 there is formed a globe 3.
  • a partition plate 4 divides the base member from the globe and. defines two spaces, i.e. a base member space and a globe space.
  • Reference numeral 5 refers designates a fluorescent lamp, the latter having a compact, winding envelope 6 formed as follows.
  • the envelope 6 is made by bending a straight glass tube into a U-shape to form a first bent part 6a and a pair of first leg parts 6b, followed by the bending of each leg part of the pair of leg parts 6b into a second U-shape to form a pair of second bent parts 6c and two pairs of second leg parts 6d.
  • the thus formed envelope 6 is of a small and compact shape and may be referred to as a saddle-shaped envelope.
  • the winding envelope 6 has a layer of phosphor material on the inner surface thereof.
  • a respective electrode 7 is mounted at each end of the envelope 6 and predetermined amounts of mercury and rare gas are sealed in the envelope 6.
  • the envelope 6 is formed with a projection, i.e. a sealed-off tip part 8, at the first bent part 6a.
  • the fluorescent lamp 5 is fixed to the partition plate 4 with first bent part 6a facing the partition plate 4, the tip part 8 projecting into the base member space through a hole 4' formed in the partition plate 4.
  • a ballast 9 is also fixed to the partition plate 4 adjacent the fluorescent lamp 5.
  • the tip part 8 is shielded by the partition plate 4 so that heat radiated from the fluorescent lamp and the ballast 9 is shielded by the partition plate 4. Moreover, the part 8 is exposed to open air via the ventilating holes 1' of the base member 1. Consequently, the part 8 becomes the lowest temperature part of the fluorescent lamp 5. It is thus possible for the fluorescent lamp 5 to maintain high lighting efficiency in spite of relatively high surrounding temperatures such as in the bowl 3. This is due to the fact that the mercury vapour pressure in the fluorescent lamp 5 is now determined by the coolest wall part of the fluorescent lamp.
  • a centre part 10a of a conventional straight glass tube 10 having openings 10' is heated to a working temperature by a heater (not shown).
  • the glass tube made of soda-lime glass, has a diameter of approximately 17.5 mm and has a softening point of about 700°C.
  • the straight tube 10 softened by the heater is bent into a U-shape having the first bent part 6a and the pair of first leg parts 6b as shown in Figure 3b.
  • each of the pair of leg parts 6b is heated to a working temperature and each is bent into a second U-shape in a direction perpendicular to the plane of the first U-shape to form the pair of second bent parts 6c and the two pairs of second leg parts 6d, as shown in Figure 3c.
  • an exhaust tube 20 made of soda-lime glass is fixed to the first bent part 6a in a manner so as to point in the same direction as the openings 10', as shown in Figure 3d.
  • the winding envelope 6 is provided with the exhaust tube 20, is then positioned with the openings 10' thereof facing upward. Then, a suspension of phosphor material is poured into the openings 10'. Following this, the envelope 6 is turned upside down so that the openings 10' face downward. Thus, excess suspension from the coating step is drained through the exhaust tube 20 and the openings 10'. Therefore, after drying the suspension of phosphor material, a uniform layer of phosphor material 12 is formed on the inner surface of the winding envelope 6.
  • the exhaust tube 20 is fused together near the bent part 6a to form the tip part 8 and seal the envelope, the remainder of the tube 20 being removed. Thereby, the tip part 8 is formed at the first bent part 6a.
  • the exhaust tube 20 it is possible to form a uniform thickness of the layer 12 of phosphor material, by employing the exhaust tube 20 at the first bent part 6a. That is, since the position of the exhaust tube 20 is at a point of symmetry of the winding envelope 6, on draining the excess phosphor material suspension, it drains evenly from the openings 10' and the exhaust tube 20 and is prevented from collecting at the bent parts 6a and 6c.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (11)

1. Un procédé de fabrication d'une lampe fluorescente (5) qui se compose d'une enveloppe enroulée (6), le procédé comprenant les opérations suivantes:
préparation d'un tube de verre rectiligne (10) ayant des orifices (10') à ses extrémités;
pliage dudit tube (10) en une forme sensiblement en U de façon à former une première partie coudée (6a) et une paire de premiers jambages (6b) et pliage de chaque jambage de ladite paire de premiers jambages (6b) en une seconde forme sensiblement en U de façon à obtenir une paire de seconds jambages (6c) et deux paires de seconds jambages (6d), qui constituent ladite enveloppe;
fixation d'un tube d'évacuation (20) à ladite première partie coudée;
dépôt d'un revêtement (12) de matériau luminophore sur la surface intérieure de ladite enveloppe enroulée (6) et évacuation de l'excès de suspension de luminophore par le tube d'évacuation (20) et les orifices (10');
fixation de façon étanche d'une électrode correspondante (7) dans l'enveloppe (6) sur ou à proximité de chacun des orifices (10');
pompage de ladite enveloppe enroulée (6) et introduction de quantités prédéterminées de mercure et de gaz rare dans l'enveloppe pompée, par ledit tube d'évacuation (20); et
scellement dudit tube d'évacuation (20) pour former un bec.
2. Un procédé selon la revendication 1 dans lequel ledit tube d'évacuation (20) est connecté de façon à s'orienter dans la même direction que les seconds jambages (6a) de ladite enveloppe enroulée (6).
3. Un procédé selon la revendication 1 ou 2, dans lequel ledit revêtement (12) est introduit lorsque les opérations de pliage ont été terminées.
4. Un procédé selon la revendication 3, dans lequel l'opération de revêtement comprend encore:
l'orientation desdits orifice (10') de l'enveloppe enroulée (6) pour qu'ils soient tournés vers le haut;
l'introduction d'une suspension de luminophore dans lesdits orifices (10'); et
le retournement de ladite enveloppe enroulée (6) sens dessus dessous et l'évacuation de l'excès de suspension par lesdits orifices (10') et par le tube d'évacuation (20).
5. Une lampe fluorescente (5) construite par un procédé selon l'une quelconque des revendications 1 à 4, comprenant:
une enveloppe enroulée (6) formée en pliant un tube de verre rectiligne sensiblement en forme de U, de façon à former une première partie coudée (6a) et une paire de premiers jambages (6b) et pliage de chaque jambage de ladite paire de premiers jambages (6b) en une seconde forme sensiblement en forme de U, de façon à former une paire de secondes parties coudées (6c) et deux paires de seconds jambages (6d);
une projection (8) constituée par un bec fermé du tube d'évacuation (20) utilisé pendant la fabrication de la lampe, formée sur ladite première partie coudée (6a);
une électrode correspondante (7) placée dans l'enveloppe (6) sur ou à proximité de chaque extrémité de l'enveloppe (6); et
une quantité de mercure et une quantité de gaz rare dans ladite enveloppe (6).
6. Une lampe fluorescente selon la revendication 5, dans laquelle ladite première partie coudée (6a) est à une certaine distance desdites électrodes (7).
7. Une lampe à incandescence selon la revendication 6, dans laquelle ladite projection (8) est sensiblement placée au centre de la première partie coudée (6a).
8. Une lampe fluorescente selon la revendication 7, dans laquelle ladite projection (8) est sensiblement sur l'axe de symétrie de ladite enveloppe (6).
9. Une lampe fluorescente selon l'une quelconque des revendications 7 et 8, dans laquelle lesdites électrodes (7) ne sont pas équipées de tubes d'évacuation.
10. Une lampe fluorescente selon l'une quelconque des revendications 7 à 9, dans laquelle ladite projection (8) contient un amalgame.
11. Une lampe fluorescente selon la revendication précédente, dans laquelle ledit amalgame comprend de l'indium.
EP81301574A 1981-04-10 1981-04-10 Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode Expired EP0062713B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP81301574A EP0062713B1 (fr) 1981-04-10 1981-04-10 Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode
DE8181301574T DE3172957D1 (en) 1981-04-10 1981-04-10 A method of manufacturing a fluorescent lamp and a fluorescent lamp obtained by this method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81301574A EP0062713B1 (fr) 1981-04-10 1981-04-10 Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode

Publications (2)

Publication Number Publication Date
EP0062713A1 EP0062713A1 (fr) 1982-10-20
EP0062713B1 true EP0062713B1 (fr) 1985-11-21

Family

ID=8188274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301574A Expired EP0062713B1 (fr) 1981-04-10 1981-04-10 Méthode pour fabriquer une lampe fluorescente et lampe fluorescente obtenue par cette méthode

Country Status (2)

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EP (1) EP0062713B1 (fr)
DE (1) DE3172957D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794301A (en) * 1986-08-19 1988-12-27 Kabushiki Kaisha Toshiba Fluorescent lamp having a convoluted discharge passage and fluorescent lamp apparatus incorporating the same
GB2278718A (en) * 1993-06-01 1994-12-07 Eldon Kai Choi Lee Method of manufacture of a discharge tube
DE102008015194A1 (de) * 2008-03-20 2009-09-24 Osram Gesellschaft mit beschränkter Haftung Entladungsgefäß für eine Entladungslampe sowie Entladungslampe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026428A2 (fr) * 1979-09-29 1981-04-08 Kabushiki Kaisha Toshiba Lampe fluorescente

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB668259A (en) * 1949-11-03 1952-03-12 British Thomson Houston Co Ltd Improvements in and relating to methods of shaping vitreous tubes
NL252546A (fr) * 1959-06-12
NL6408346A (fr) * 1964-07-22 1966-01-24
US3551736A (en) * 1968-04-02 1970-12-29 Gunther Anthony Doehner Fluorescent lamps constructed for use in conventional light fixtures
NL168367C (nl) * 1975-06-20 1982-03-16 Philips Nv Lagedrukkwikdampontladingslamp en werkwijze voor de vervaardiging hiervan.
NL179854C (nl) * 1977-08-23 1986-11-17 Philips Nv Lagedrukkwikdampontladingslamp.
NL7709266A (nl) * 1977-08-23 1979-02-27 Koninkl Philips Electronics Nv Lagedrukkwikdampontladingslamp.
NL7810672A (nl) * 1978-10-26 1980-04-29 Philips Nv Lagedrukkwikdampontladingslamp.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026428A2 (fr) * 1979-09-29 1981-04-08 Kabushiki Kaisha Toshiba Lampe fluorescente

Also Published As

Publication number Publication date
DE3172957D1 (en) 1986-01-02
EP0062713A1 (fr) 1982-10-20

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