US1688777A - Gas-filled electric incandescent lamp - Google Patents

Gas-filled electric incandescent lamp Download PDF

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Publication number
US1688777A
US1688777A US231130A US23113027A US1688777A US 1688777 A US1688777 A US 1688777A US 231130 A US231130 A US 231130A US 23113027 A US23113027 A US 23113027A US 1688777 A US1688777 A US 1688777A
Authority
US
United States
Prior art keywords
filament
bulb
gas
leads
lamp
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
US231130A
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English (en)
Inventor
Bergmans Jan
M Theodorus Josephus Alphonsus
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US1688777A publication Critical patent/US1688777A/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
    • H01K1/28—Envelopes; Vessels

Definitions

  • the invention relates to an electric incandescent gas filled lamp, such as a projection lamp with a highly concentrated filament and a filling of gas inert to the filament.
  • the filament in such lamps which have an extremely high light intensity, is heated to very high temperature, with the result that evaporation occurs during which particles emitted from the filament deposit on the inside of the surrounding bulb. Owing to this precipitation of these particles, the inside of the bulb becomes blackened or covered by a soot-like layer, which decreases the brightness of the lamp and causes the lamp to become unsuitable for purposes of illumination. Naturally, this blackening greatly diminishes the efficiency of the lamp and methods have been sought to prevent or diminish it.
  • T e purpose of the present invention is to secure a forced draft inside the lamp without the use of partitions and without requiring that the lamp be divided into separate sections.
  • the part of the bulb through which the light rays originating from the filament pass has been designed in such a way that it is tubular, surrounds the filament closely and is of comparatively small bore.
  • the concentrated filament is located at the end of the tubular part of the bulb, through which the leads for supplying current to the filament extend. In use the bulb is positioned in such a way that the filament is located in the lower part of the bulb.
  • the gases, heated directly by the filament, will rise and will be conducted by means of the hot leads which carry the current to the filament to a part of the bulb where these gases may cool off. After this cooling has occurred the comparatively cool gases move downwards, following the inside of the tubular part of the bulb, and thus return to the filament.
  • the cool gases moving downward act as though they surround the upward current of hot gases, and when reaching the lower part of the bulb the cool gases will move with some force along the inside of this lpart which surrounds the filament closely, as
  • the tubular part of the bulb may be expanded reatly to form a bulbous or spherical chamdier in the neighborhood of the stem, while the filament is mounted in the end of the tubular part remote from this chamber and as far as possible from the stem.
  • the construction also has the advantage that the filament is surrounded by a tubular glass envelope occupying very little space, while the expanded part of the bulb is located at considerable distance from the filament. Owing to this feature the lamps are very suitable for use for projection purposes.
  • This construction has certain advantages in optical systems using a lens or condenser, as well as in those using a mirror. In the first place, the lens or condenser can be placed much closer to the light source, allowing a more compact construction, and in the second place the expanded part of the bulb is outside the cone of light, so that the light rays are less deformed or weakened. It is, of course, understood that the bulb must be manufactured of a kind of glass which can withstand the high temperatures which are present in the immediate proximity of the filament.
  • a concentrated filament 1 is mounted on the ends of a pair of strai ht parallel leads 2 and 3 which support the filament and also supply current to it through the leading in wires 5 and 6 in the stem and the base 7 which is connected by a socket to a source of current.
  • the filament and the leads are enclosed in a sealed gas filled bulb which contains an inert as and has a bulbous tubular part 8 of smalldiore closely surrounding the filament 1, and. which is expanded into a spherical part or cooling chamber 9 in the neighborhood of the base 7.
  • the filament 1 located near the sealed end of the tubular part 8 of the bulb will glow and consequently the surrounding inert gas will be heated.
  • a similar heating of the gas takes place between the leads 2 and 3 which are preferably proportioned to be brought by the normal current flowing through them to a temperature high enough to heat the adjoining and surrounding gas sufiiciently to cause it to ow upwards along the leads.
  • the heated gas will flow upwards along the leads with a velocity great enough to carry alon the particles of filament material and W51 flow into the spherical part or cooling chamber 9 which has a bore so much greater than that of the tubular part 8 that it loses velocity and deposits the particles of filament material.
  • the heated gas is cooled off at the surface of the spherical chamber, whereupon it flows downwards along the sides of the tubular part 8 until it reaches the lower end of the tubular part 8 of the bulb, where it will be again reheated by the filament.
  • a gas filled incandescent electric lamp comprising a pair of parallel leads propor- "tioned to be heated by the normal current flowing through them to a temperature sufiicient to cause a flow of the adjoining gas when the lamp is lighted, a concentrated filament on the end of said leads, and a sealed tubular bulb containing inert gas and enclosing said leads and said filament with one end ad acent said filament and of a bore such that when the lam is lighted currents of gas free from eddies ow along said leads and along said bulb walls with a velocity so great that blackening of the bulb walls in the vicinity of the filament is substantially absent.
  • An incandescent electric lamp comprising a sealed bulb having a straight tubular portion closed at one end and expanded near the other end into a bulbous chamber of considerably greater diameter than said tubular portion, a pair of straight parallel leads mounted in said tubular portion and extending from near its closed end into said chamher, and a concentrated filament mounted on the ends of said leads near the closed end of said tubular portion of the bulb, said tubular portion having a bore small enough to cause the currents set up in the gas in the bulb when the lamp is lighted to flow with suflicient velocity to maintain the bulb walls adjacent said filament substantially free from blackenll'l
  • a gas filled incandescent electric lamp comprising a sealed bulb containing an inert gas and having a straight tubular ortion and a portion at one end enlarged to orm a cooling chamber, a stem extending into said cooling chamber, a base on said coolin chamber adjoining said stem, a pair of straight leads secured to said stem to extend through said cooling chamber and into said tubular portion and proportioned to be heated by
  • An incandescent electric lamp comprising a sealed bulb having a straight tubular leads near th 1 d d portlonpf small bore closed at one end and tion of the blil en of Sald tubular pm a spherical chamber of conslderable grester In witness whereof, we have hereunto set 10 diameter at the other end, a, pair of straight our hands this 8th day of October 1927.
  • tubular portion lnto said tubular portion, THEODORUS JOSEPHUS JACOBUS and a concentrated filamentmounted on said ALPHONSUS MANDERS.
  • tubular portion lnto said tubular portion, THEODORUS JOSEPHUS JACOBUS and a concentrated filamentmounted on said ALPHONSUS MANDERS.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Resistance Heating (AREA)
US231130A 1926-12-21 1927-11-04 Gas-filled electric incandescent lamp Expired - Lifetime US1688777A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1688777X 1926-12-21
NL359712X 1929-11-23

Publications (1)

Publication Number Publication Date
US1688777A true US1688777A (en) 1928-10-23

Family

ID=26643676

Family Applications (1)

Application Number Title Priority Date Filing Date
US231130A Expired - Lifetime US1688777A (en) 1926-12-21 1927-11-04 Gas-filled electric incandescent lamp

Country Status (5)

Country Link
US (1) US1688777A (enrdf_load_stackoverflow)
BE (1) BE374146A (enrdf_load_stackoverflow)
DE (1) DE535089C (enrdf_load_stackoverflow)
FR (1) FR703655A (enrdf_load_stackoverflow)
GB (1) GB359712A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR703655A (fr) 1931-05-04
GB359712A (en) 1931-10-29
BE374146A (enrdf_load_stackoverflow)
DE535089C (de) 1931-10-05

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