CA1169471A - Electric incandescent lamp - Google Patents
Electric incandescent lampInfo
- Publication number
- CA1169471A CA1169471A CA000391917A CA391917A CA1169471A CA 1169471 A CA1169471 A CA 1169471A CA 000391917 A CA000391917 A CA 000391917A CA 391917 A CA391917 A CA 391917A CA 1169471 A CA1169471 A CA 1169471A
- Authority
- CA
- Canada
- Prior art keywords
- lamp
- pinch
- recess
- envelope
- cap
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
Landscapes
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
Abstract
PHN. 9917 An electric incandescent lamp according to the invention has a lamp envelope the pinch of which extends in a recess of an insulating body and is secured to body by means of cement. The insulating body forms part of a lamp cap. On the surface of the pinch a projection is present which determines the depth to which the pinch extends in the recess of the insulating member.
Description
``` 3 -~. ti~7~
P~N 9917 l 1.7.1981.
Electric incandescent lamp.
The inventi.on relates to an electric incandes-cent lamp having a glass lamp envelope which comprises a pinch, in which lamp envelope a filament is accommodated, connected to current supply conductors which emanate in a vacuum-tight manner through the pinch and which are con-nected to the contacts of a lamp cap which consists for the greater part of an electrically-insulating body, the pinch of the lamp envelope extending in a recess in the insulating body and being secured therein by means of a cement. Such a lamp in which the insulating member is a ceramic body is known ~rom Netherlands Patent Application 6717374 and may be used as a projection lamp, a studio lamp, or a theater lamp.
In all cases in which a lamp is used in an opti-lS cal system, the filament should be aligned with respect to the lamp cap so that, when the lamp is placed in a lamp holder of an optical system, the filament occupies a previously determined position in said~system.
. : Lamps for the above-mentioned application often :.~ 20 consume a high power and emit light o~ a high colour temperature. The resulting high pinch temperatures neces-. : sitate the use of a lamp cap having an insulating member of ceramic or of a synthetic resin which can withstand ; hi.gh temperatures, up to approximately 4OO C, and neces-sitate the use of a cement for the connection o~ the lamp cap to the lamp envelope. ~ ~
~ The curing of cement requires;a comparatively :: long time. In that time, the lamp envelope and~the lamp ~: : cap should remain fixed and aligned so as t~o prevent any ~ 30 displacement of the fllament relative~to:the lamp cap.
~ This involves a prolonged occupation of the alignment ap-~ paratus and increases the cost of the lamp.
It is the object of the invention to provide a :: : : : :
:.~,. . . . .
' : ~ , :-- , ,: ;
, PHN 9917 2 1.7.1981.
lamp construction which enables the cement which connects the lamp cap to the lamp envelope to be cured outside an alignment apparatus.
According to the invention this object is achiev-ed in a lamp of -the kind mentioned in the opening para-graph in that at least one projection which determines the depth to which the pinch extends into the recess in the insulating member of the lamp cap is present on the sur-face of the pinch.
In manufacturing lamps, the filament can be positioned in the lamp envelope with great accuracy at a given distance from a reference on the pinch. By construct-ing the reference on the pinch as one or more projections on the surface of the pinch and proportioning said pro-jections so that when lamp cap and lamp envelope are unit-ed the projection(s) cannot penetrate into the recess or cannot penetrate into the recess in the insulating member of the lamp cap further than a previously determined amount, the distance from the filament to the lamp cap is fixed in the lamp according to the invention. This distance, the so-called light centre length, is the most important para-~ meter of the position of the filament.
,r`, The construction of the lamp according to the invention makes it possible to cure the cement which se-cures the lamp envelope and the lamp cap together without an alignment apparatus being kept occupied during the curing period. In lamps in which the centre of gravity of the lamp envelope is situated near the lamp cap and a stable support of the lamp envelope by the projections on the pinch surface is ensured, it is even not necessary to use mechanical auxiliary means 9 such as a lamp or a -- jig, to fix the lamp envelope relative to the lamp cap during curing~
In an embodiment of the lamp according to the invention, a projection is present on the pinch surface on each of the two oppositely-located wider side faces - of the pinch. In a modified embodiment, two or more pro-jections are present on each of these two side faces. In , . :
,~:
' ~, jf~
P~N 9917 3 1.7 1981.
this modified embodiment the lamp envelope during the ma-nufacture of the lamp has a particularly stable position with respect to the lamp cap.
The projections on the pinch surface may bear 5 against the insulatlng rnember itself la-terally of the recess therein. ~nother possibility is that the recess in the insulating body is covered for the greater part by means of a glass, ceramic, synthetic resin or metal disc which has an aperture through which the pinch of the lamp envelope can only be passed up to the projection(s).
~n this embodirr~ent commercially-available lamp caps may be used which are destined to be united with a lamp en-velope in a conventional manner so as to form a finished lamp.
The lamp according to the invention has the ad-vantage that the afore-mentioned disc or the boundary of the recess in the insulating member forms a supporting surface for the cement which joins the lamp envelope to the lamp cap. In conventional lamps the recess in the lamp cap, after the pinch of the lamp envelope has been placed therein, is filled with sand so as to form a supporting surface for the cement and to prevent tha-t a lot of cemen-t is used~ In the lamp according to -the invention the use of sand is superfluous, as will become apparent herein-after.
The lamp according to the invention may have alamp cap for use in an Edison or bayonet lamp holder, or in a lamp holder of a different shape, for example with one or more sockets. Due to -the high colour temperature, the high yield and to the luminous efficiency of halog0n incandescent lamps which remains the same during the life-time, the lamp according to the invention may comprise halogen in addition to inert gas, and may hence have a lamp envelope of a type of glass having a high silicon dioxide content, for example, of 95% by weight or more, for example, quartz glass.
Embodiments of the lamp according to the invent-ion are shown in the drawing. In the drawing PHN 9917 4 1.7.1981.
Figure 1 and Figure 2 are a front elevation and a side elevation, respectively, of a first embodiment, Figure 1 being a par-tial sectional view of the lamp cap;
Figure 2a is a plan view of a component of that embodiment;
Figure 3 is a f`ront elevation of a second embo-diment;
~ igure 4 is a sect:ional view taken on the line I~-IV of Figure 3; and Figure 5 is a analogous sectional view of a third embodiment.
In Figures 1 and 2 the lamp envelope l has a pinch 2 and a filament 3 which is connec-ted to current supply conductors 4 and 5 which emanate in a vacuum-tight manner through the pinch 2 and are connected -there to the contacts 8 and 9 of a lamp cap 6 consisting for the great-er part of a ceramic body 7 of steatite. The contact 8 is previously secured to the body 7 by means of cement 16.
The ceramic body has a recess 10 in which the pinch 2 of the lamp envelope 1 extends. At its surface, on the wider side faces 15, the pinch 2 has two pairs of projections 12 which determine the depth to which the pinch 2 extends in the recess 10 of the ceramic body 7. In this embodiment a metal disc 13 is provided which bears on an edge 14.
The projections 12 bear on the disc 13. The lamp envelope 1 is connected to the lamp cap 6 by means of cement 11.
Upon assembling the lamp, the stability of the lamp enve-lope 1 in the lamp cap 6 is still increased in that the current conductor 4 extends through the bottom of the lamp cap 6 at the area where the contact 9 is to be pro-duced. The disc 13 substantially covers the recess 10 so that a supporting surface is presented for the cement mass 11 which is soft when being provided, and sagging away of said mass into the recess 10 is prevented. The aperture 17 in the disc 13 (Figure 2a) only allows the pinch 2 to be passed therethrough only up to the projections 13.
The reference numerals in Figure 3 and Figure 4 are 20 higher than those for corresponding components of :' '` ` `
' " ' ' .
. , ' " .
7~l PHN 9917 5 1.7.1gg1~
the lamp of Figure 1 and Figure 2. In these Figures, the contacts of the lamp cap 26 are plug pins 28 and 29. The recess 30 in the ceramic body 27 is proportioned so that the pinch 22 fi-ts therein with a small amount of play. The projections 32 on the surface of the pinch 22, however, bear on the edge 34. In this embodiment the projections 32 are ribs which each extend over the whole width of the relevant wider face 35 of the pinch 22 on which they are present. The lamp shown is a 220 V 1,000 W theater lamp having during operation a pinch temperature of 400 C and a colour temperature of 3,000 K.
In Figure 5 the pinch 42 has a projection 52 on only one wider side face 55. The remaining reference nume-rals are 20 higher than those of corresponding parts in Figure 4.
' ; :
::
;
.
- : :
P~N 9917 l 1.7.1981.
Electric incandescent lamp.
The inventi.on relates to an electric incandes-cent lamp having a glass lamp envelope which comprises a pinch, in which lamp envelope a filament is accommodated, connected to current supply conductors which emanate in a vacuum-tight manner through the pinch and which are con-nected to the contacts of a lamp cap which consists for the greater part of an electrically-insulating body, the pinch of the lamp envelope extending in a recess in the insulating body and being secured therein by means of a cement. Such a lamp in which the insulating member is a ceramic body is known ~rom Netherlands Patent Application 6717374 and may be used as a projection lamp, a studio lamp, or a theater lamp.
In all cases in which a lamp is used in an opti-lS cal system, the filament should be aligned with respect to the lamp cap so that, when the lamp is placed in a lamp holder of an optical system, the filament occupies a previously determined position in said~system.
. : Lamps for the above-mentioned application often :.~ 20 consume a high power and emit light o~ a high colour temperature. The resulting high pinch temperatures neces-. : sitate the use of a lamp cap having an insulating member of ceramic or of a synthetic resin which can withstand ; hi.gh temperatures, up to approximately 4OO C, and neces-sitate the use of a cement for the connection o~ the lamp cap to the lamp envelope. ~ ~
~ The curing of cement requires;a comparatively :: long time. In that time, the lamp envelope and~the lamp ~: : cap should remain fixed and aligned so as t~o prevent any ~ 30 displacement of the fllament relative~to:the lamp cap.
~ This involves a prolonged occupation of the alignment ap-~ paratus and increases the cost of the lamp.
It is the object of the invention to provide a :: : : : :
:.~,. . . . .
' : ~ , :-- , ,: ;
, PHN 9917 2 1.7.1981.
lamp construction which enables the cement which connects the lamp cap to the lamp envelope to be cured outside an alignment apparatus.
According to the invention this object is achiev-ed in a lamp of -the kind mentioned in the opening para-graph in that at least one projection which determines the depth to which the pinch extends into the recess in the insulating member of the lamp cap is present on the sur-face of the pinch.
In manufacturing lamps, the filament can be positioned in the lamp envelope with great accuracy at a given distance from a reference on the pinch. By construct-ing the reference on the pinch as one or more projections on the surface of the pinch and proportioning said pro-jections so that when lamp cap and lamp envelope are unit-ed the projection(s) cannot penetrate into the recess or cannot penetrate into the recess in the insulating member of the lamp cap further than a previously determined amount, the distance from the filament to the lamp cap is fixed in the lamp according to the invention. This distance, the so-called light centre length, is the most important para-~ meter of the position of the filament.
,r`, The construction of the lamp according to the invention makes it possible to cure the cement which se-cures the lamp envelope and the lamp cap together without an alignment apparatus being kept occupied during the curing period. In lamps in which the centre of gravity of the lamp envelope is situated near the lamp cap and a stable support of the lamp envelope by the projections on the pinch surface is ensured, it is even not necessary to use mechanical auxiliary means 9 such as a lamp or a -- jig, to fix the lamp envelope relative to the lamp cap during curing~
In an embodiment of the lamp according to the invention, a projection is present on the pinch surface on each of the two oppositely-located wider side faces - of the pinch. In a modified embodiment, two or more pro-jections are present on each of these two side faces. In , . :
,~:
' ~, jf~
P~N 9917 3 1.7 1981.
this modified embodiment the lamp envelope during the ma-nufacture of the lamp has a particularly stable position with respect to the lamp cap.
The projections on the pinch surface may bear 5 against the insulatlng rnember itself la-terally of the recess therein. ~nother possibility is that the recess in the insulating body is covered for the greater part by means of a glass, ceramic, synthetic resin or metal disc which has an aperture through which the pinch of the lamp envelope can only be passed up to the projection(s).
~n this embodirr~ent commercially-available lamp caps may be used which are destined to be united with a lamp en-velope in a conventional manner so as to form a finished lamp.
The lamp according to the invention has the ad-vantage that the afore-mentioned disc or the boundary of the recess in the insulating member forms a supporting surface for the cement which joins the lamp envelope to the lamp cap. In conventional lamps the recess in the lamp cap, after the pinch of the lamp envelope has been placed therein, is filled with sand so as to form a supporting surface for the cement and to prevent tha-t a lot of cemen-t is used~ In the lamp according to -the invention the use of sand is superfluous, as will become apparent herein-after.
The lamp according to the invention may have alamp cap for use in an Edison or bayonet lamp holder, or in a lamp holder of a different shape, for example with one or more sockets. Due to -the high colour temperature, the high yield and to the luminous efficiency of halog0n incandescent lamps which remains the same during the life-time, the lamp according to the invention may comprise halogen in addition to inert gas, and may hence have a lamp envelope of a type of glass having a high silicon dioxide content, for example, of 95% by weight or more, for example, quartz glass.
Embodiments of the lamp according to the invent-ion are shown in the drawing. In the drawing PHN 9917 4 1.7.1981.
Figure 1 and Figure 2 are a front elevation and a side elevation, respectively, of a first embodiment, Figure 1 being a par-tial sectional view of the lamp cap;
Figure 2a is a plan view of a component of that embodiment;
Figure 3 is a f`ront elevation of a second embo-diment;
~ igure 4 is a sect:ional view taken on the line I~-IV of Figure 3; and Figure 5 is a analogous sectional view of a third embodiment.
In Figures 1 and 2 the lamp envelope l has a pinch 2 and a filament 3 which is connec-ted to current supply conductors 4 and 5 which emanate in a vacuum-tight manner through the pinch 2 and are connected -there to the contacts 8 and 9 of a lamp cap 6 consisting for the great-er part of a ceramic body 7 of steatite. The contact 8 is previously secured to the body 7 by means of cement 16.
The ceramic body has a recess 10 in which the pinch 2 of the lamp envelope 1 extends. At its surface, on the wider side faces 15, the pinch 2 has two pairs of projections 12 which determine the depth to which the pinch 2 extends in the recess 10 of the ceramic body 7. In this embodiment a metal disc 13 is provided which bears on an edge 14.
The projections 12 bear on the disc 13. The lamp envelope 1 is connected to the lamp cap 6 by means of cement 11.
Upon assembling the lamp, the stability of the lamp enve-lope 1 in the lamp cap 6 is still increased in that the current conductor 4 extends through the bottom of the lamp cap 6 at the area where the contact 9 is to be pro-duced. The disc 13 substantially covers the recess 10 so that a supporting surface is presented for the cement mass 11 which is soft when being provided, and sagging away of said mass into the recess 10 is prevented. The aperture 17 in the disc 13 (Figure 2a) only allows the pinch 2 to be passed therethrough only up to the projections 13.
The reference numerals in Figure 3 and Figure 4 are 20 higher than those for corresponding components of :' '` ` `
' " ' ' .
. , ' " .
7~l PHN 9917 5 1.7.1gg1~
the lamp of Figure 1 and Figure 2. In these Figures, the contacts of the lamp cap 26 are plug pins 28 and 29. The recess 30 in the ceramic body 27 is proportioned so that the pinch 22 fi-ts therein with a small amount of play. The projections 32 on the surface of the pinch 22, however, bear on the edge 34. In this embodiment the projections 32 are ribs which each extend over the whole width of the relevant wider face 35 of the pinch 22 on which they are present. The lamp shown is a 220 V 1,000 W theater lamp having during operation a pinch temperature of 400 C and a colour temperature of 3,000 K.
In Figure 5 the pinch 42 has a projection 52 on only one wider side face 55. The remaining reference nume-rals are 20 higher than those of corresponding parts in Figure 4.
' ; :
::
;
.
- : :
Claims (2)
1. An electric incandescent lamp having a glass lamp envelope which comprises a pinch, in which lamp envelope a filament is accommodated, connected to current supply conductors which emanate in a vacuum-tight manner through the pinch and which are connected to the contacts of a lamp cap which consists for the greater part of an electrically-insulating body, the pinch of the lamp enve-lope extending in a recess in the insulating body and being secured therein by means of a cement, characterized in that at least one projection which determines the depth with which the pinch extends into the recess in the insulating member of the lamp cap is present on the surface of the pinch of the lamp envelope.
2. An electric incandescent lamp as claimed in Claim 1, characterized in that the recess in the insula-ting body is covered for the greater part with a disc having an aperture through which the pinch of the lamp envelope can only be passed up to the projection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8006801 | 1980-12-16 | ||
| NL8006801A NL8006801A (en) | 1980-12-16 | 1980-12-16 | ELECTRIC LIGHT BULB. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169471A true CA1169471A (en) | 1984-06-19 |
Family
ID=19836328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391917A Expired CA1169471A (en) | 1980-12-16 | 1981-12-10 | Electric incandescent lamp |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS57124846A (en) |
| BE (1) | BE891472A (en) |
| CA (1) | CA1169471A (en) |
| DE (1) | DE3148822A1 (en) |
| FR (1) | FR2496339A1 (en) |
| GB (1) | GB2089563B (en) |
| NL (1) | NL8006801A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4728847A (en) * | 1985-05-17 | 1988-03-01 | U.S. Philips Corporation | Electric lamp having an envelope with an intermediate zirconium oxide coated layer |
| NL8700734A (en) * | 1987-03-30 | 1988-10-17 | Philips Nv | ELECTRIC COOKING UNIT AND ELECTRIC COOKING EQUIPMENT THEREOF. |
| JPH0668857A (en) * | 1992-08-13 | 1994-03-11 | Nishimura Togyo Kk | Bulb provided with display part having durability |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2053138A (en) * | 1935-06-20 | 1936-09-01 | Gen Electric | Miniature incandescent lamp |
| NL6717374A (en) * | 1967-01-24 | 1968-07-25 | ||
| GB1204624A (en) * | 1968-02-22 | 1970-09-09 | Thorn Lighting Ltd Formerly Kn | Electric lamps |
| JPS51138083A (en) * | 1975-05-26 | 1976-11-29 | Etou Denki Kk | Incandescent lamp |
| DE2655231C2 (en) * | 1976-12-06 | 1986-12-04 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | Halogen light bulb |
-
1980
- 1980-12-16 NL NL8006801A patent/NL8006801A/en not_active Application Discontinuation
-
1981
- 1981-12-10 CA CA000391917A patent/CA1169471A/en not_active Expired
- 1981-12-10 DE DE19813148822 patent/DE3148822A1/en not_active Ceased
- 1981-12-11 GB GB8137475A patent/GB2089563B/en not_active Expired
- 1981-12-11 FR FR8123186A patent/FR2496339A1/en active Granted
- 1981-12-12 JP JP20080781A patent/JPS57124846A/en active Pending
- 1981-12-14 BE BE0/206830A patent/BE891472A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2496339A1 (en) | 1982-06-18 |
| GB2089563A (en) | 1982-06-23 |
| GB2089563B (en) | 1984-03-21 |
| FR2496339B1 (en) | 1984-07-13 |
| JPS57124846A (en) | 1982-08-03 |
| BE891472A (en) | 1982-06-14 |
| NL8006801A (en) | 1982-07-16 |
| DE3148822A1 (en) | 1982-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |