EP0122045A2 - Incandescent lamps - Google Patents
Incandescent lamps Download PDFInfo
- Publication number
- EP0122045A2 EP0122045A2 EP84301593A EP84301593A EP0122045A2 EP 0122045 A2 EP0122045 A2 EP 0122045A2 EP 84301593 A EP84301593 A EP 84301593A EP 84301593 A EP84301593 A EP 84301593A EP 0122045 A2 EP0122045 A2 EP 0122045A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- filament
- lamp
- support
- wires
- sections
- 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- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/02—Incandescent bodies
- H01K1/16—Electric connection thereto
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/18—Mountings or supports for the incandescent body
Abstract
Description
- This invention relates to electric incandescent filament lamps, and particularly to halogen cycle studiolamps of the type comprising, within a sealed envelope, a filament having a plurality of closely adjacent filament sections lying substantially in the same plane supported within a framework consisting of a pair of longitudinally extending support wires fixed in position within the envelope at one end, and a pair of insulating bridge members extending between the support wires and carrying a number of anchor wires which engage and support different parts of the filament.
- Conventionally, such lamps have an even number of filament sections and are connected end to.end in a zig-zag pattern with each end of a filament being connected to a respective support wire. It is clear, therefore, that both of the connections to the support wires take place at the same end of the lamp in relation to the longitudinal extent of each of each filament section.
- When such lamps are in use vertically, meaning that the axis of the lamp, the support wires and the filament sections are all substantially vertical, they present no problem. When, however, lamps of this construction having a high power output, for example 2 kW or more, are used in the horizontal position, it has been found that the lamps burn out after a very short period of time compared to their lifetime when in the vertical position.
- The invention therefore provides an electric incandescent filament lamp of the type specified in which there is an odd number of filament sections such that the connection of one end of the filament to one support wire is remote from the connection of the other end of the filament to the other support wire. It has been found that this modification significantly prolongs the life of the lamps when used in the horizontal position. The number of filament sections employed in a lamp in accordance with the invention will usually be at least five and not more than nine, although the most suitable number will depend upon the form of lamp and its required power output.
- One form of the lamp in accordance with the invention will now be described by way of example with reference to the drawing in which:-
- Figure 1 represents a sectional elevation through a conventional studio lamp and,
- Figure 2 represents a sectional elevation through a studio'lamp in accordance with the invention.
- In Figure 1 the lamp comprises a transparent quartz envelope 1 of generally tubular form with a bulbous central portion, the envelope being domed at one end, and closed by a pressing at its opposite end. Current leads through the
pinch 2 are provided bystrips 13 of molybdenum foil, against which the quartz is pressed, the inner and outer ends of the strips being connected tofilament support conductors terminal pin conductors 3 adjacent ends of which are also embedded in the quartz of thepinch 2. Theterminal pin conductors 3 pass through aceramic support member 4 which supports thepinch 2 and are brazed or arc welded at their outer ends intorespective terminal pins 23. - Within the envelope there is mounted a
coiled tungsten filament 5 comprising an even plurality of substantially parallel and closely-spaced filament sections each lying perpendicular to thepinch 2, the filament sections lying either in a common plane or in a staggered relationship in two closely-adjacent parallel planes. - The
filament 5 is mounted within a rectangular supporting framework consisting of the twosupport wires short quartz rods rods support wires wires 10 passing through the ends of the rods and attached to the support wires. -
Anchor wires 11 are fixed in the rods, two inrod 8 and three inrod 9, and are hooked at their ends facing each other and engage the hookedportions 12 connecting adjacent filament sections. Each end of thefilament 5 is connected to a respective support wire. - The lamp envelope contains a filling of an inert gas at a cold pressure of at least 2, for example on the order of 2), atmospheres, together with a small quantity of a halogen, such as bromine, as is customary in halogen cycle studio lamps.
- When the lamp is in use in a horizontal position it has been found that arcs tend to develop between the two connections to the support wires and the filament melts and breaks in these regions. It is thought that this is due to failure of the convection currents within the envelope to provide effective cooling in the region when the lamp is in the horizontal position leading to space charge breakdown and ionisation of the filling gas.
- In Figure 2, which shows 'a lamp according to the invention, all the equivalent parts have the same reference numbers as in Figure 1. In this lamp there is an
extra anchor wire 11 in therod 8 and there is an extra filament section thus providing an odd number of filament sections so that the connection between thefilament 4 and thesupport wire 7 occurs at the opposite end of thesupport wire 7 compared to the equivalent connection between thefilament 4 and thesupport wire 6. Having the former connection as remote from the latter connection as possible has been found to eliminate the arcing effect between the two connection regions and the lamp may be used in the horizontal position for substantially longer periods without failure. - In tests, only about 50% of conventional lamps survived after 10 minutes burning at an angle of 90° to the vertical, whereas lamps according to the invention were lit for 100 hours in the horizontal position without failure. Thus the advantage of the lamp according to the invention may easily be seen.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8309560 | 1983-04-08 | ||
GB838309560A GB8309560D0 (en) | 1983-04-08 | 1983-04-08 | Incandescent lamps |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0122045A2 true EP0122045A2 (en) | 1984-10-17 |
EP0122045A3 EP0122045A3 (en) | 1985-10-23 |
Family
ID=10540809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84301593A Withdrawn EP0122045A3 (en) | 1983-04-08 | 1984-03-09 | Incandescent lamps |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0122045A3 (en) |
GB (2) | GB8309560D0 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160016A (en) * | 1984-06-06 | 1985-12-11 | Gen Electric Co Plc | Incandescent lamps |
US8459525B2 (en) | 2008-02-14 | 2013-06-11 | Ethicon Endo-Sugery, Inc. | Motorized surgical cutting and fastening instrument having a magnetic drive train torque limiting device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2597681A (en) * | 1950-07-01 | 1952-05-20 | Gen Electric | Electric incandescent lamp |
US3621111A (en) * | 1970-07-01 | 1971-11-16 | Gen Electric | Lead-in conductor for electrical devices |
-
1983
- 1983-04-08 GB GB838309560A patent/GB8309560D0/en active Pending
-
1984
- 1984-03-09 EP EP84301593A patent/EP0122045A3/en not_active Withdrawn
- 1984-03-09 GB GB848406273A patent/GB8406273D0/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2597681A (en) * | 1950-07-01 | 1952-05-20 | Gen Electric | Electric incandescent lamp |
US3621111A (en) * | 1970-07-01 | 1971-11-16 | Gen Electric | Lead-in conductor for electrical devices |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160016A (en) * | 1984-06-06 | 1985-12-11 | Gen Electric Co Plc | Incandescent lamps |
US8459525B2 (en) | 2008-02-14 | 2013-06-11 | Ethicon Endo-Sugery, Inc. | Motorized surgical cutting and fastening instrument having a magnetic drive train torque limiting device |
Also Published As
Publication number | Publication date |
---|---|
GB8406273D0 (en) | 1984-04-11 |
EP0122045A3 (en) | 1985-10-23 |
GB8309560D0 (en) | 1983-05-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE NL |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): DE NL |
|
17P | Request for examination filed |
Effective date: 19860120 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM- GEC LIMITED |
|
17Q | First examination report despatched |
Effective date: 19870504 |
|
D17Q | First examination report despatched (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19880217 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RIDGEN, SYDNEY ALFRED RICHARD Inventor name: SKELDON, GRAHAM WARREN |