US3471737A - Screen for lamp filament - Google Patents

Screen for lamp filament Download PDF

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Publication number
US3471737A
US3471737A US637961A US3471737DA US3471737A US 3471737 A US3471737 A US 3471737A US 637961 A US637961 A US 637961A US 3471737D A US3471737D A US 3471737DA US 3471737 A US3471737 A US 3471737A
Authority
US
United States
Prior art keywords
screen
lamp
wire
filament
wires
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
US637961A
Other languages
English (en)
Inventor
Horst Horster
Jan Christiaan Pennekamp
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3471737A publication Critical patent/US3471737A/en
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
    • H01K1/26—Screens; Filters

Definitions

  • the invention relates to an incandescent lamp having a lament and a framework secured to the current-supply wires of said filament and provided with a screen consisting of wire material.
  • Such a lamp is known; the said screen has for its object to minimize the degree of blackening of the interior of the lamp bulb due to the deposition of evaporated material of the filament.
  • This drawback especially occurs in incandescent lamps having a comparatively heavily loaded tilament, for example, projection lamps or filmstudio lamps.
  • Applicant has found that it is of importance to protect the elements of the screen as far as possible from sagging during the use of the lamp. FoFr if the distance between these screen-wire elements increases, the degree of blackening of the interior of the lamp bulb also increases. This drawback becomes particularly disturbing if the relevant lamp has comparatively large dimensions, since in this case the distance lbetween the supporting points of the screen-wire elements is comparatively large and moreover the filament is used at a comparatively high temperature.
  • the object of the present invention is to provide a construction for the screen of such a lamp which on the one hand is simple and on the other hand, as shown by experiments, leads to an embodiment in which the screenwire elements continue to be subjected to a tensile stress also during a longer operation of the lamp.
  • the incandescent lamp of the aforementioned kind according to the invention is characterized in that the screen consists of wire material stretched out on the framework, substantially straight screen-wire elements alternating with tensile spring elements obtained by a local deformation of the screen-wire material.
  • the tensile spring elements holding the screen in the prestressed state are constituted by the screen-wire material itself.
  • the tensile spring elements consist of helically wound screen-wire elements.
  • the construction shown has two terminal wires 1 between which a filament 4 is stationed-also with the aid of supporting beams 2 of insulating material and of supporting hooks 3. Furthermore, a framework comprising beams 5 and interposed stay wires 6 is secured to the terminal wires 1. Screen wires 7 are stretched between the said stay wires.
  • the wires 7 consist of straight wire portions 8 alternating with tensile spring elements 9.
  • the elements 9 are obtained by a local deformation of the screenwire material; in the embodiment shown, they consist of helically wound wire portions.
  • the screen wires 7 continue to be subjected to a tensile stress so that the sag of said wires will tbe to a minimum. Especially in the case of lamps having comparatively heavily loaded filaments, this is of great impartance.
  • an incandescent lamp including a pair of spaced current-supply wires and a filament supported between these wires, the improvement in combination therewith, comprising: a framework secured to the current-supply wires and a screen of wire material supported on the framework and substantially surrounding the filament at least on four sides, the screen formed of wire 'having alternate straight sections and tensile-spring sections whereby the screen wire is maintained in tension when assembled and during operation of the lamp.
  • a method for providing tension in a substantially straight wire wound about a framework and substantially surrounding the filament as a screen in an incandescent lamp comprising the steps:

Landscapes

  • Overhead Projectors And Projection Screens (AREA)
  • Planar Illumination Modules (AREA)
  • Discharge Lamp (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
US637961A 1966-06-03 1967-05-12 Screen for lamp filament Expired - Lifetime US3471737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6607700A NL6607700A (xx) 1966-06-03 1966-06-03

Publications (1)

Publication Number Publication Date
US3471737A true US3471737A (en) 1969-10-07

Family

ID=19796781

Family Applications (1)

Application Number Title Priority Date Filing Date
US637961A Expired - Lifetime US3471737A (en) 1966-06-03 1967-05-12 Screen for lamp filament

Country Status (4)

Country Link
US (1) US3471737A (xx)
DE (1) DE1589251B2 (xx)
GB (1) GB1178459A (xx)
NL (1) NL6607700A (xx)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1899587A (en) * 1930-10-31 1933-02-28 Gen Electric Incandescent electric lamp
US2100879A (en) * 1936-07-29 1937-11-30 Gen Electric Electric lamp
US2232816A (en) * 1940-01-19 1941-02-25 Gen Electric Electric lamp
US2300997A (en) * 1941-04-30 1942-11-03 Gen Electric Electric incandescent lamp
US2326419A (en) * 1942-12-31 1943-08-10 Gen Electric Electric lamp
US2467710A (en) * 1946-06-28 1949-04-19 Gen Electric Incandescent lamp
US2784338A (en) * 1954-07-09 1957-03-05 Siemens Electric Lamps & Suppl Incandescent electric lamps
US2862125A (en) * 1956-01-06 1958-11-25 Sylvania Electric Prod Heat shield for incandescent lamp
US2973443A (en) * 1959-06-10 1961-02-28 Gen Electric Electric incandescent lamp
US3034007A (en) * 1959-01-23 1962-05-08 Gen Electric Electric incandescent lamp
US3184629A (en) * 1960-04-14 1965-05-18 Philips Corp Gas-filled electric lamp with a gas-directing screen

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1899587A (en) * 1930-10-31 1933-02-28 Gen Electric Incandescent electric lamp
US2100879A (en) * 1936-07-29 1937-11-30 Gen Electric Electric lamp
US2232816A (en) * 1940-01-19 1941-02-25 Gen Electric Electric lamp
US2300997A (en) * 1941-04-30 1942-11-03 Gen Electric Electric incandescent lamp
US2326419A (en) * 1942-12-31 1943-08-10 Gen Electric Electric lamp
US2467710A (en) * 1946-06-28 1949-04-19 Gen Electric Incandescent lamp
US2784338A (en) * 1954-07-09 1957-03-05 Siemens Electric Lamps & Suppl Incandescent electric lamps
US2862125A (en) * 1956-01-06 1958-11-25 Sylvania Electric Prod Heat shield for incandescent lamp
US3034007A (en) * 1959-01-23 1962-05-08 Gen Electric Electric incandescent lamp
US2973443A (en) * 1959-06-10 1961-02-28 Gen Electric Electric incandescent lamp
US3184629A (en) * 1960-04-14 1965-05-18 Philips Corp Gas-filled electric lamp with a gas-directing screen

Also Published As

Publication number Publication date
GB1178459A (en) 1970-01-21
DE1589251B2 (de) 1975-10-09
NL6607700A (xx) 1967-12-04
DE1589251A1 (de) 1970-03-26

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