EP2637196A2 - Procédé pour la couverture d'un culot de lampe résistante aux éclats, appareil à cet effet, et lampe ainsi fabriquée - Google Patents

Procédé pour la couverture d'un culot de lampe résistante aux éclats, appareil à cet effet, et lampe ainsi fabriquée Download PDF

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Publication number
EP2637196A2
EP2637196A2 EP13157893.2A EP13157893A EP2637196A2 EP 2637196 A2 EP2637196 A2 EP 2637196A2 EP 13157893 A EP13157893 A EP 13157893A EP 2637196 A2 EP2637196 A2 EP 2637196A2
Authority
EP
European Patent Office
Prior art keywords
lamp
coating
end cap
face
flap portion
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.)
Withdrawn
Application number
EP13157893.2A
Other languages
German (de)
English (en)
Other versions
EP2637196A3 (fr
Inventor
David Payne
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.)
Fotolec Technologies Ltd
Original Assignee
Fotolec Technologies Ltd
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 Fotolec Technologies Ltd filed Critical Fotolec Technologies Ltd
Publication of EP2637196A2 publication Critical patent/EP2637196A2/fr
Publication of EP2637196A3 publication Critical patent/EP2637196A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/03—Arrangements for preventing or mitigating effects of implosion of vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/08—Vessels; Containers; Shields associated therewith; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • 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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/205—Applying optical coatings or shielding coatings to the vessel of flat panel displays, e.g. applying filter layers, electromagnetic interference shielding layers, anti-reflection coatings or anti-glare coatings

Definitions

  • the invention relates to methods for coating electrical lamps, and in particular to fragment retention lamps.
  • the closest prior art is the Applicant's own process of coating fluorescent tubes with a plastics film, so that if the tube shatters in use, the plastics film retains all of the glass fragments.
  • a shroud which covers the metallic end cap of a fragment retention lamp.
  • the protective shroud is typically placed over contact pins of the lamp, whereby the pins protrude through the body of the shroud.
  • a continuous film coating is then applied to both the light emitting outer surface of the lamp and the shroud.
  • the continuous film coating is applied to the light emitting outer surface of the lamp and its associated end caps.
  • the protective shrouds are then located over the end caps of the lamp and directly attached to the coating of the lamp.
  • the problem of the fragment retention lamp is that if the lamp hits the ground and shatters, glass fragments or debris may become separated from the fragment retention lamp. This may result in the glass fragments or debris protruding through the centre of one of the lamp's end caps.
  • the invention by coating the lamp with a suitable plastics material, which has extending flat portions that are arranged over the centre portions of the end caps, seeks to solve this problem.
  • the invention provides a method of coating an end cap of a fragment retention lamp, comprising the steps of:
  • a method of coating an end cap of a fragment retention lamp further comprising the additional step of forming a second flap portion of coating which extends beyond said end cap located at said first end of said first lamp.
  • This provides a means of covering an increased surface of the end face surface of the end cap, which prevents glass fragments or debris from escaping the covered end face of the cap.
  • a method of coating an end cap of a fragment retention lamp further comprising the additional step of arranging said second flap portion over said centre portion of said end face and said flap portion. It provides a means for a more effective closure of the coating about an end cap, whereby the second flap portion cooperates with the first flap portion to provide a means of augmenting the central covering, which prevents sharp glass fragments from cutting through the two enclosing flap portions.
  • a method of coating an end cap of a fragment retention lamp further comprising the additional step of applying an adhesive material to the inner surface said second flap portion and / or said flap portion.
  • This provides a means of fixing the portions of coating in the desired position, whilst cooperating with each other and against the end face of an end cap.
  • a method of coating an end cap of a fragment retention lamp further comprises the additional step of forming a portion of coating which extends about and beyond an outer edge of said end face of said end cap, wherein said portion is arranged against said end face.
  • This configuration prevents the movement of glass fragments or debris between the layer of coating and the outer surface of the lamp and/or end cap so that they cannot protrude from or exit the lamp.
  • the invention provides an apparatus for coating an end of a fragment retention lamp, comprising:
  • said means for dividing said coating is a laser cutting means. This provides a means for accurately dividing the continuous coating, which enables the separation of the two lamps.
  • said laser cutting means forms said flap in accordance to predetermined profile. This enables the laser cutter to accurately cut the coating in accordance with accurately stored or loaded profiles which can be either automatically or manually selected.
  • said predetermined profile parabola shaped.
  • This configuration provides the coating portion with the maximum surface area coverage at its base and providing coverage by its elongated end portion, which is located over the central portion of the end face of the cap, in between the two electrical contact pins of the lamp.
  • a fragment retention lamp obtained from said method stated above.
  • a fragment retention lamp manufactured by said apparatus stated above.
  • the invention provides a fragment retention lamp, comprising a comprising a continuous coating along its length; said coating incorporates a flap portion that extends beyond an end cap located at one end of said lamp, which in use, is arranged over a centre portion of an end face of said end cap.
  • Figure 1 shows two fluorescent tube lamps 1 and 2 axially arranged end to end, whereby an end cap 3 of the first lamp 1 is arranged in close proximity to an end cap 4 of the second lamp 2.
  • a linking member 5 is arranged between the two lamps 1 and 2, which links the two lamps 1 and 2 together in a continuous cylinder configuration.
  • a continuous coating 6 is applied to the outer surface of the two lamps 1 and 2, and the linking member 5.
  • the coating is a continuous plastics film coating applied to the lamps 1 and 2 by a cross head application process.
  • a laser cutting means 7 emits a cutting laser beam 8 onto the coating 6 that extends across the link member 5, located between the two lamps 1 and 2.
  • the laser cutting means 7 incorporates information/program that is indicative of a predetermined profile which is used to cut the coating 6.
  • the profile of the laser cut provides two engaged parabola-shaped end portions 9 and 10. Both of the parabola shaped end portions 9 and 10 are rotated 180 degrees in relation to other.
  • FIG. 2 shows the separation of the two lamps 1 and 2 whereby the link device 5 has been removed and the profiles of the two end portions 9 and 10 of the coating are rotated by 180 degrees in relation to each other.
  • Lamp 1 shows two flap portions 11 and 12 arranged within the coating 6, and lamp 2 shows a flap portion 13 arranged within coating 6.
  • the flap portion 13 is the inverse of flap portions 11 and 12.
  • Figure 3 shows an end portion 9 of the lamp 1 whereby the coating portion 12 has been folded over, against the end face surface 15 of the end cap 3.
  • the electrical connect pins 16 of the lamp 1 are shown to be extending from the folded portion 12.
  • the second portion 11 is shown to be extending from the end face surface 15 of the end cap 3.
  • Figure 4 shows the lamp 1 whereby the second portion of coating 11 is folded over the folded first portion of coating 12.
  • the second portion of coating 11 overlays the first portion 12 and allows the electrical contact pins 16 to protrude from the end cap 3 and from the folded portions of coating 11 and 12 folded over / arranged about the end face 14 of the end cap 3.
  • the first and second portions form a multi-layered coating which retains any fragments of broken glass. This is due to the increased thickness and therefore the increased mechanical strength of the multi-layered coated, which resists the sharp edges of the glass fragments.
  • first portion is retained in its folded position, over the face of the end cap, by the position of the folded second portion.
  • Figure 5 shows an end view of the enclosed end cap 3 of the fragment lamp 1 whereby the first portion 12 of coating 6 has been folded over the centre portion of the end face 15 of the end cap 3 and a second portion of coating 11 has been folded over the top of the first portion of coating 12 and is laying directly across the centre portion of the end cap 3, between the two electrical contact pins 16.
  • the arranged flat portions of the coating prevent any chards from escaping the fragment retention lamp through the centre portion of the end cap. This is of great of great concern as slithers of glass or debris may protrude through the end portion if the lamp is dropped and or shatters; this in particularly relevant in a clean room environment such as food or drug processing facilities.
  • a protrusion of coating may extend about the outer edge of the end face, which is the subsequently be folded over the outer edge of the end cap and against the end face of the end cap to form a bevelled edge; therefore preventing any glass fragments or debris from escaping the lamp, by limiting their movement between the coating and the end cap.
  • the flap portions of coating that have been folded over and re-arranged against the end face of the end cap may incorporate an adhesive substance on each of the inner surfaces of the flaps that allows the flats to be formed and held flat against the end cap's end face therefore preventing the coating portion from springing back into the original positions.
  • a hot air device may be used to soften the continuous plastics coating which surrounds the lamp so that when the flaps and/or bevelled edge are formed and pushed into the position the substances will co-operate with the hot air gun and will set in position once the plastics material has cooled.
  • various cutting profiles may be loaded and maintained in the memory of the cutting device which can be called upon when needed, i.e. different cutting profiles may be required for different tube diameters and flap configurations.
  • An embodiment of the protection of the end cap may be used which incorporates only a single flap which is folded across the centre of the end face of the end cap to prevent any chards from escaping through the centre portion of the end cap, without the use of a second flap.
  • the advantage of the claimed invention is to provide a means of coating a fragment retention lamp with a continuous coating, which also coats and seals the ends of the lamp to prevent the protrusions of any class fragments from the lamp's ends.
  • the claimed invention provides a solution to simplifying and improving the coating of a fragment retention lamp to prevent the protrusion of broken glass fragments at either end of the lamp.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
EP13157893.2A 2012-03-05 2013-03-05 Procédé pour la couverture d'un culot de lampe résistante aux éclats, appareil à cet effet, et lampe ainsi fabriquée Withdrawn EP2637196A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1203840.2A GB2499998A (en) 2012-03-05 2012-03-05 A method of coating an end cap of a lamp in order to retain fragments of glass if broken

Publications (2)

Publication Number Publication Date
EP2637196A2 true EP2637196A2 (fr) 2013-09-11
EP2637196A3 EP2637196A3 (fr) 2014-08-27

Family

ID=46003136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13157893.2A Withdrawn EP2637196A3 (fr) 2012-03-05 2013-03-05 Procédé pour la couverture d'un culot de lampe résistante aux éclats, appareil à cet effet, et lampe ainsi fabriquée

Country Status (2)

Country Link
EP (1) EP2637196A3 (fr)
GB (1) GB2499998A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15737U1 (de) * 2016-11-28 2018-05-15 Zumtobel Lighting Gmbh Längliche Leuchte

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729085A (en) * 1996-03-22 1998-03-17 Royal Lite Manufacturing And Supply Corp. Fluorescent lamp with a protective assembly
US20020187705A1 (en) * 2000-07-24 2002-12-12 Dupont Paul Robert Shatterproofing of fluorescent lamps

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673401A (en) * 1969-10-29 1972-06-27 Thermoplastic Processes Inc Fluorescent lamp protection apparatus
GB2480243B (en) * 2010-05-10 2014-03-12 Fotolec Technologies Ltd A shroud

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729085A (en) * 1996-03-22 1998-03-17 Royal Lite Manufacturing And Supply Corp. Fluorescent lamp with a protective assembly
US20020187705A1 (en) * 2000-07-24 2002-12-12 Dupont Paul Robert Shatterproofing of fluorescent lamps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15737U1 (de) * 2016-11-28 2018-05-15 Zumtobel Lighting Gmbh Längliche Leuchte

Also Published As

Publication number Publication date
GB201203840D0 (en) 2012-04-18
GB2499998A (en) 2013-09-11
EP2637196A3 (fr) 2014-08-27

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